[FFmpeg-cvslog] r9382 - in trunk/libavformat: Makefile mpeg.c mpeg.h mpegenc.c
bcoudurier
subversion
Thu Jun 21 11:39:29 CEST 2007
Author: bcoudurier
Date: Thu Jun 21 11:39:29 2007
New Revision: 9382
Log:
split mpeg ps and variants muxer and demuxer, I'll clean more in a few minutes, lpcm freq tab is left static const in mpeg.h for now until we have more code in common
Added:
trunk/libavformat/mpeg.h
- copied, changed from r9381, /trunk/libavformat/mpeg.c
trunk/libavformat/mpegenc.c
- copied, changed from r9381, /trunk/libavformat/mpeg.c
Modified:
trunk/libavformat/Makefile
trunk/libavformat/mpeg.c
Modified: trunk/libavformat/Makefile
==============================================================================
--- trunk/libavformat/Makefile (original)
+++ trunk/libavformat/Makefile Thu Jun 21 11:39:29 2007
@@ -84,11 +84,11 @@ OBJS-$(CONFIG_MP3_DEMUXER)
OBJS-$(CONFIG_MP3_MUXER) += mp3.o
OBJS-$(CONFIG_MP4_MUXER) += movenc.o riff.o isom.o
OBJS-$(CONFIG_MPC_DEMUXER) += mpc.o
-OBJS-$(CONFIG_MPEG1SYSTEM_MUXER) += mpeg.o
-OBJS-$(CONFIG_MPEG1VCD_MUXER) += mpeg.o
-OBJS-$(CONFIG_MPEG2DVD_MUXER) += mpeg.o
-OBJS-$(CONFIG_MPEG2VOB_MUXER) += mpeg.o
-OBJS-$(CONFIG_MPEG2SVCD_MUXER) += mpeg.o
+OBJS-$(CONFIG_MPEG1SYSTEM_MUXER) += mpegenc.o
+OBJS-$(CONFIG_MPEG1VCD_MUXER) += mpegenc.o
+OBJS-$(CONFIG_MPEG2DVD_MUXER) += mpegenc.o
+OBJS-$(CONFIG_MPEG2VOB_MUXER) += mpegenc.o
+OBJS-$(CONFIG_MPEG2SVCD_MUXER) += mpegenc.o
OBJS-$(CONFIG_MPEG1VIDEO_MUXER) += raw.o
OBJS-$(CONFIG_MPEG2VIDEO_MUXER) += raw.o
OBJS-$(CONFIG_MPEGPS_DEMUXER) += mpeg.o
Modified: trunk/libavformat/mpeg.c
==============================================================================
--- trunk/libavformat/mpeg.c (original)
+++ trunk/libavformat/mpeg.c Thu Jun 21 11:39:29 2007
@@ -1,5 +1,5 @@
/*
- * MPEG1/2 muxer and demuxer
+ * MPEG1/2 demuxer
* Copyright (c) 2000, 2001, 2002 Fabrice Bellard.
*
* This file is part of FFmpeg.
@@ -18,1243 +18,15 @@
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
+
#include "avformat.h"
-#include "bitstream.h"
-#include "fifo.h"
+#include "mpeg.h"
-#define MAX_PAYLOAD_SIZE 4096
//#define DEBUG_SEEK
#undef NDEBUG
#include <assert.h>
-typedef struct PacketDesc {
- int64_t pts;
- int64_t dts;
- int size;
- int unwritten_size;
- int flags;
- struct PacketDesc *next;
-} PacketDesc;
-
-typedef struct {
- AVFifoBuffer fifo;
- uint8_t id;
- int max_buffer_size; /* in bytes */
- int buffer_index;
- PacketDesc *predecode_packet;
- PacketDesc *premux_packet;
- PacketDesc **next_packet;
- int packet_number;
- uint8_t lpcm_header[3];
- int lpcm_align;
- int bytes_to_iframe;
- int align_iframe;
- int64_t vobu_start_pts;
-} StreamInfo;
-
-typedef struct {
- int packet_size; /* required packet size */
- int packet_number;
- int pack_header_freq; /* frequency (in packets^-1) at which we send pack headers */
- int system_header_freq;
- int system_header_size;
- int mux_rate; /* bitrate in units of 50 bytes/s */
- /* stream info */
- int audio_bound;
- int video_bound;
- int is_mpeg2;
- int is_vcd;
- int is_svcd;
- int is_dvd;
- int64_t last_scr; /* current system clock */
-
- double vcd_padding_bitrate; //FIXME floats
- int64_t vcd_padding_bytes_written;
-
-} MpegMuxContext;
-
-#define PACK_START_CODE ((unsigned int)0x000001ba)
-#define SYSTEM_HEADER_START_CODE ((unsigned int)0x000001bb)
-#define SEQUENCE_END_CODE ((unsigned int)0x000001b7)
-#define PACKET_START_CODE_MASK ((unsigned int)0xffffff00)
-#define PACKET_START_CODE_PREFIX ((unsigned int)0x00000100)
-#define ISO_11172_END_CODE ((unsigned int)0x000001b9)
-
-/* mpeg2 */
-#define PROGRAM_STREAM_MAP 0x1bc
-#define PRIVATE_STREAM_1 0x1bd
-#define PADDING_STREAM 0x1be
-#define PRIVATE_STREAM_2 0x1bf
-
-
-#define AUDIO_ID 0xc0
-#define VIDEO_ID 0xe0
-#define AC3_ID 0x80
-#define DTS_ID 0x8a
-#define LPCM_ID 0xa0
-#define SUB_ID 0x20
-
-#define STREAM_TYPE_VIDEO_MPEG1 0x01
-#define STREAM_TYPE_VIDEO_MPEG2 0x02
-#define STREAM_TYPE_AUDIO_MPEG1 0x03
-#define STREAM_TYPE_AUDIO_MPEG2 0x04
-#define STREAM_TYPE_PRIVATE_SECTION 0x05
-#define STREAM_TYPE_PRIVATE_DATA 0x06
-#define STREAM_TYPE_AUDIO_AAC 0x0f
-#define STREAM_TYPE_VIDEO_MPEG4 0x10
-#define STREAM_TYPE_VIDEO_H264 0x1b
-
-#define STREAM_TYPE_AUDIO_AC3 0x81
-#define STREAM_TYPE_AUDIO_DTS 0x8a
-
-static const int lpcm_freq_tab[4] = { 48000, 96000, 44100, 32000 };
-
-#ifdef CONFIG_MUXERS
-AVOutputFormat mpeg1system_muxer;
-AVOutputFormat mpeg1vcd_muxer;
-AVOutputFormat mpeg2vob_muxer;
-AVOutputFormat mpeg2svcd_muxer;
-AVOutputFormat mpeg2dvd_muxer;
-
-static int put_pack_header(AVFormatContext *ctx,
- uint8_t *buf, int64_t timestamp)
-{
- MpegMuxContext *s = ctx->priv_data;
- PutBitContext pb;
-
- init_put_bits(&pb, buf, 128);
-
- put_bits(&pb, 32, PACK_START_CODE);
- if (s->is_mpeg2) {
- put_bits(&pb, 2, 0x1);
- } else {
- put_bits(&pb, 4, 0x2);
- }
- put_bits(&pb, 3, (uint32_t)((timestamp >> 30) & 0x07));
- put_bits(&pb, 1, 1);
- put_bits(&pb, 15, (uint32_t)((timestamp >> 15) & 0x7fff));
- put_bits(&pb, 1, 1);
- put_bits(&pb, 15, (uint32_t)((timestamp) & 0x7fff));
- put_bits(&pb, 1, 1);
- if (s->is_mpeg2) {
- /* clock extension */
- put_bits(&pb, 9, 0);
- }
- put_bits(&pb, 1, 1);
- put_bits(&pb, 22, s->mux_rate);
- put_bits(&pb, 1, 1);
- if (s->is_mpeg2) {
- put_bits(&pb, 1, 1);
- put_bits(&pb, 5, 0x1f); /* reserved */
- put_bits(&pb, 3, 0); /* stuffing length */
- }
- flush_put_bits(&pb);
- return pbBufPtr(&pb) - pb.buf;
-}
-
-static int put_system_header(AVFormatContext *ctx, uint8_t *buf,int only_for_stream_id)
-{
- MpegMuxContext *s = ctx->priv_data;
- int size, i, private_stream_coded, id;
- PutBitContext pb;
-
- init_put_bits(&pb, buf, 128);
-
- put_bits(&pb, 32, SYSTEM_HEADER_START_CODE);
- put_bits(&pb, 16, 0);
- put_bits(&pb, 1, 1);
-
- put_bits(&pb, 22, s->mux_rate); /* maximum bit rate of the multiplexed stream */
- put_bits(&pb, 1, 1); /* marker */
- if (s->is_vcd && only_for_stream_id==VIDEO_ID) {
- /* This header applies only to the video stream (see VCD standard p. IV-7)*/
- put_bits(&pb, 6, 0);
- } else
- put_bits(&pb, 6, s->audio_bound);
-
- if (s->is_vcd) {
- /* see VCD standard, p. IV-7*/
- put_bits(&pb, 1, 0);
- put_bits(&pb, 1, 1);
- } else {
- put_bits(&pb, 1, 0); /* variable bitrate*/
- put_bits(&pb, 1, 0); /* non constrainted bit stream */
- }
-
- if (s->is_vcd || s->is_dvd) {
- /* see VCD standard p IV-7 */
- put_bits(&pb, 1, 1); /* audio locked */
- put_bits(&pb, 1, 1); /* video locked */
- } else {
- put_bits(&pb, 1, 0); /* audio locked */
- put_bits(&pb, 1, 0); /* video locked */
- }
-
- put_bits(&pb, 1, 1); /* marker */
-
- if (s->is_vcd && only_for_stream_id==AUDIO_ID) {
- /* This header applies only to the audio stream (see VCD standard p. IV-7)*/
- put_bits(&pb, 5, 0);
- } else
- put_bits(&pb, 5, s->video_bound);
-
- if (s->is_dvd) {
- put_bits(&pb, 1, 0); /* packet_rate_restriction_flag */
- put_bits(&pb, 7, 0x7f); /* reserved byte */
- } else
- put_bits(&pb, 8, 0xff); /* reserved byte */
-
- /* DVD-Video Stream_bound entries
- id (0xB9) video, maximum P-STD for stream 0xE0. (P-STD_buffer_bound_scale = 1)
- id (0xB8) audio, maximum P-STD for any MPEG audio (0xC0 to 0xC7) streams. If there are none set to 4096 (32x128). (P-STD_buffer_bound_scale = 0)
- id (0xBD) private stream 1 (audio other than MPEG and subpictures). (P-STD_buffer_bound_scale = 1)
- id (0xBF) private stream 2, NAV packs, set to 2x1024. */
- if (s->is_dvd) {
-
- int P_STD_max_video = 0;
- int P_STD_max_mpeg_audio = 0;
- int P_STD_max_mpeg_PS1 = 0;
-
- for(i=0;i<ctx->nb_streams;i++) {
- StreamInfo *stream = ctx->streams[i]->priv_data;
-
- id = stream->id;
- if (id == 0xbd && stream->max_buffer_size > P_STD_max_mpeg_PS1) {
- P_STD_max_mpeg_PS1 = stream->max_buffer_size;
- } else if (id >= 0xc0 && id <= 0xc7 && stream->max_buffer_size > P_STD_max_mpeg_audio) {
- P_STD_max_mpeg_audio = stream->max_buffer_size;
- } else if (id == 0xe0 && stream->max_buffer_size > P_STD_max_video) {
- P_STD_max_video = stream->max_buffer_size;
- }
- }
-
- /* video */
- put_bits(&pb, 8, 0xb9); /* stream ID */
- put_bits(&pb, 2, 3);
- put_bits(&pb, 1, 1);
- put_bits(&pb, 13, P_STD_max_video / 1024);
-
- /* audio */
- if (P_STD_max_mpeg_audio == 0)
- P_STD_max_mpeg_audio = 4096;
- put_bits(&pb, 8, 0xb8); /* stream ID */
- put_bits(&pb, 2, 3);
- put_bits(&pb, 1, 0);
- put_bits(&pb, 13, P_STD_max_mpeg_audio / 128);
-
- /* private stream 1 */
- put_bits(&pb, 8, 0xbd); /* stream ID */
- put_bits(&pb, 2, 3);
- put_bits(&pb, 1, 0);
- put_bits(&pb, 13, P_STD_max_mpeg_PS1 / 128);
-
- /* private stream 2 */
- put_bits(&pb, 8, 0xbf); /* stream ID */
- put_bits(&pb, 2, 3);
- put_bits(&pb, 1, 1);
- put_bits(&pb, 13, 2);
- }
- else {
- /* audio stream info */
- private_stream_coded = 0;
- for(i=0;i<ctx->nb_streams;i++) {
- StreamInfo *stream = ctx->streams[i]->priv_data;
-
-
- /* For VCDs, only include the stream info for the stream
- that the pack which contains this system belongs to.
- (see VCD standard p. IV-7) */
- if ( !s->is_vcd || stream->id==only_for_stream_id
- || only_for_stream_id==0) {
-
- id = stream->id;
- if (id < 0xc0) {
- /* special case for private streams (AC3 use that) */
- if (private_stream_coded)
- continue;
- private_stream_coded = 1;
- id = 0xbd;
- }
- put_bits(&pb, 8, id); /* stream ID */
- put_bits(&pb, 2, 3);
- if (id < 0xe0) {
- /* audio */
- put_bits(&pb, 1, 0);
- put_bits(&pb, 13, stream->max_buffer_size / 128);
- } else {
- /* video */
- put_bits(&pb, 1, 1);
- put_bits(&pb, 13, stream->max_buffer_size / 1024);
- }
- }
- }
- }
-
- flush_put_bits(&pb);
- size = pbBufPtr(&pb) - pb.buf;
- /* patch packet size */
- buf[4] = (size - 6) >> 8;
- buf[5] = (size - 6) & 0xff;
-
- return size;
-}
-
-static int get_system_header_size(AVFormatContext *ctx)
-{
- int buf_index, i, private_stream_coded;
- StreamInfo *stream;
- MpegMuxContext *s = ctx->priv_data;
-
- if (s->is_dvd)
- return 18; // DVD-Video system headers are 18 bytes fixed length.
-
- buf_index = 12;
- private_stream_coded = 0;
- for(i=0;i<ctx->nb_streams;i++) {
- stream = ctx->streams[i]->priv_data;
- if (stream->id < 0xc0) {
- if (private_stream_coded)
- continue;
- private_stream_coded = 1;
- }
- buf_index += 3;
- }
- return buf_index;
-}
-
-static int mpeg_mux_init(AVFormatContext *ctx)
-{
- MpegMuxContext *s = ctx->priv_data;
- int bitrate, i, mpa_id, mpv_id, mps_id, ac3_id, dts_id, lpcm_id, j;
- AVStream *st;
- StreamInfo *stream;
- int audio_bitrate;
- int video_bitrate;
-
- s->packet_number = 0;
- s->is_vcd = (ctx->oformat == &mpeg1vcd_muxer);
- s->is_svcd = (ctx->oformat == &mpeg2svcd_muxer);
- s->is_mpeg2 = (ctx->oformat == &mpeg2vob_muxer || ctx->oformat == &mpeg2svcd_muxer || ctx->oformat == &mpeg2dvd_muxer);
- s->is_dvd = (ctx->oformat == &mpeg2dvd_muxer);
-
- if(ctx->packet_size)
- s->packet_size = ctx->packet_size;
- else
- s->packet_size = 2048;
-
- s->vcd_padding_bytes_written = 0;
- s->vcd_padding_bitrate=0;
-
- s->audio_bound = 0;
- s->video_bound = 0;
- mpa_id = AUDIO_ID;
- ac3_id = AC3_ID;
- dts_id = DTS_ID;
- mpv_id = VIDEO_ID;
- mps_id = SUB_ID;
- lpcm_id = LPCM_ID;
- for(i=0;i<ctx->nb_streams;i++) {
- st = ctx->streams[i];
- stream = av_mallocz(sizeof(StreamInfo));
- if (!stream)
- goto fail;
- st->priv_data = stream;
-
- av_set_pts_info(st, 64, 1, 90000);
-
- switch(st->codec->codec_type) {
- case CODEC_TYPE_AUDIO:
- if (st->codec->codec_id == CODEC_ID_AC3) {
- stream->id = ac3_id++;
- } else if (st->codec->codec_id == CODEC_ID_DTS) {
- stream->id = dts_id++;
- } else if (st->codec->codec_id == CODEC_ID_PCM_S16BE) {
- stream->id = lpcm_id++;
- for(j = 0; j < 4; j++) {
- if (lpcm_freq_tab[j] == st->codec->sample_rate)
- break;
- }
- if (j == 4)
- goto fail;
- if (st->codec->channels > 8)
- return -1;
- stream->lpcm_header[0] = 0x0c;
- stream->lpcm_header[1] = (st->codec->channels - 1) | (j << 4);
- stream->lpcm_header[2] = 0x80;
- stream->lpcm_align = st->codec->channels * 2;
- } else {
- stream->id = mpa_id++;
- }
-
- /* This value HAS to be used for VCD (see VCD standard, p. IV-7).
- Right now it is also used for everything else.*/
- stream->max_buffer_size = 4 * 1024;
- s->audio_bound++;
- break;
- case CODEC_TYPE_VIDEO:
- stream->id = mpv_id++;
- if (st->codec->rc_buffer_size)
- stream->max_buffer_size = 6*1024 + st->codec->rc_buffer_size/8;
- else
- stream->max_buffer_size = 230*1024; //FIXME this is probably too small as default
-#if 0
- /* see VCD standard, p. IV-7*/
- stream->max_buffer_size = 46 * 1024;
- else
- /* This value HAS to be used for SVCD (see SVCD standard, p. 26 V.2.3.2).
- Right now it is also used for everything else.*/
- stream->max_buffer_size = 230 * 1024;
-#endif
- s->video_bound++;
- break;
- case CODEC_TYPE_SUBTITLE:
- stream->id = mps_id++;
- stream->max_buffer_size = 16 * 1024;
- break;
- default:
- return -1;
- }
- av_fifo_init(&stream->fifo, 16);
- }
- bitrate = 0;
- audio_bitrate = 0;
- video_bitrate = 0;
- for(i=0;i<ctx->nb_streams;i++) {
- int codec_rate;
- st = ctx->streams[i];
- stream = (StreamInfo*) st->priv_data;
-
- if(st->codec->rc_max_rate || stream->id==VIDEO_ID)
- codec_rate= st->codec->rc_max_rate;
- else
- codec_rate= st->codec->bit_rate;
-
- if(!codec_rate)
- codec_rate= (1<<21)*8*50/ctx->nb_streams;
-
- bitrate += codec_rate;
-
- if (stream->id==AUDIO_ID)
- audio_bitrate += codec_rate;
- else if (stream->id==VIDEO_ID)
- video_bitrate += codec_rate;
- }
-
- if(ctx->mux_rate){
- s->mux_rate= (ctx->mux_rate + (8 * 50) - 1) / (8 * 50);
- } else {
- /* we increase slightly the bitrate to take into account the
- headers. XXX: compute it exactly */
- bitrate += bitrate*5/100;
- bitrate += 10000;
- s->mux_rate = (bitrate + (8 * 50) - 1) / (8 * 50);
- }
-
- if (s->is_vcd) {
- double overhead_rate;
-
- /* The VCD standard mandates that the mux_rate field is 3528
- (see standard p. IV-6).
- The value is actually "wrong", i.e. if you calculate
- it using the normal formula and the 75 sectors per second transfer
- rate you get a different value because the real pack size is 2324,
- not 2352. But the standard explicitly specifies that the mux_rate
- field in the header must have this value.*/
-// s->mux_rate=2352 * 75 / 50; /* = 3528*/
-
- /* The VCD standard states that the muxed stream must be
- exactly 75 packs / second (the data rate of a single speed cdrom).
- Since the video bitrate (probably 1150000 bits/sec) will be below
- the theoretical maximum we have to add some padding packets
- to make up for the lower data rate.
- (cf. VCD standard p. IV-6 )*/
-
- /* Add the header overhead to the data rate.
- 2279 data bytes per audio pack, 2294 data bytes per video pack*/
- overhead_rate = ((audio_bitrate / 8.0) / 2279) * (2324 - 2279);
- overhead_rate += ((video_bitrate / 8.0) / 2294) * (2324 - 2294);
- overhead_rate *= 8;
-
- /* Add padding so that the full bitrate is 2324*75 bytes/sec */
- s->vcd_padding_bitrate = 2324 * 75 * 8 - (bitrate + overhead_rate);
- }
-
- if (s->is_vcd || s->is_mpeg2)
- /* every packet */
- s->pack_header_freq = 1;
- else
- /* every 2 seconds */
- s->pack_header_freq = 2 * bitrate / s->packet_size / 8;
-
- /* the above seems to make pack_header_freq zero sometimes */
- if (s->pack_header_freq == 0)
- s->pack_header_freq = 1;
-
- if (s->is_mpeg2)
- /* every 200 packets. Need to look at the spec. */
- s->system_header_freq = s->pack_header_freq * 40;
- else if (s->is_vcd)
- /* the standard mandates that there are only two system headers
- in the whole file: one in the first packet of each stream.
- (see standard p. IV-7 and IV-8) */
- s->system_header_freq = 0x7fffffff;
- else
- s->system_header_freq = s->pack_header_freq * 5;
-
- for(i=0;i<ctx->nb_streams;i++) {
- stream = ctx->streams[i]->priv_data;
- stream->packet_number = 0;
- }
- s->system_header_size = get_system_header_size(ctx);
- s->last_scr = 0;
- return 0;
- fail:
- for(i=0;i<ctx->nb_streams;i++) {
- av_free(ctx->streams[i]->priv_data);
- }
- return AVERROR(ENOMEM);
-}
-
-static inline void put_timestamp(ByteIOContext *pb, int id, int64_t timestamp)
-{
- put_byte(pb,
- (id << 4) |
- (((timestamp >> 30) & 0x07) << 1) |
- 1);
- put_be16(pb, (uint16_t)((((timestamp >> 15) & 0x7fff) << 1) | 1));
- put_be16(pb, (uint16_t)((((timestamp) & 0x7fff) << 1) | 1));
-}
-
-
-/* return the number of padding bytes that should be inserted into
- the multiplexed stream.*/
-static int get_vcd_padding_size(AVFormatContext *ctx, int64_t pts)
-{
- MpegMuxContext *s = ctx->priv_data;
- int pad_bytes = 0;
-
- if (s->vcd_padding_bitrate > 0 && pts!=AV_NOPTS_VALUE)
- {
- int64_t full_pad_bytes;
-
- full_pad_bytes = (int64_t)((s->vcd_padding_bitrate * (pts / 90000.0)) / 8.0); //FIXME this is wrong
- pad_bytes = (int) (full_pad_bytes - s->vcd_padding_bytes_written);
-
- if (pad_bytes<0)
- /* might happen if we have already padded to a later timestamp. This
- can occur if another stream has already advanced further.*/
- pad_bytes=0;
- }
-
- return pad_bytes;
-}
-
-
-#if 0 /* unused, remove? */
-/* return the exact available payload size for the next packet for
- stream 'stream_index'. 'pts' and 'dts' are only used to know if
- timestamps are needed in the packet header. */
-static int get_packet_payload_size(AVFormatContext *ctx, int stream_index,
- int64_t pts, int64_t dts)
-{
- MpegMuxContext *s = ctx->priv_data;
- int buf_index;
- StreamInfo *stream;
-
- stream = ctx->streams[stream_index]->priv_data;
-
- buf_index = 0;
- if (((s->packet_number % s->pack_header_freq) == 0)) {
- /* pack header size */
- if (s->is_mpeg2)
- buf_index += 14;
- else
- buf_index += 12;
-
- if (s->is_vcd) {
- /* there is exactly one system header for each stream in a VCD MPEG,
- One in the very first video packet and one in the very first
- audio packet (see VCD standard p. IV-7 and IV-8).*/
-
- if (stream->packet_number==0)
- /* The system headers refer only to the stream they occur in,
- so they have a constant size.*/
- buf_index += 15;
-
- } else {
- if ((s->packet_number % s->system_header_freq) == 0)
- buf_index += s->system_header_size;
- }
- }
-
- if ((s->is_vcd && stream->packet_number==0)
- || (s->is_svcd && s->packet_number==0))
- /* the first pack of each stream contains only the pack header,
- the system header and some padding (see VCD standard p. IV-6)
- Add the padding size, so that the actual payload becomes 0.*/
- buf_index += s->packet_size - buf_index;
- else {
- /* packet header size */
- buf_index += 6;
- if (s->is_mpeg2) {
- buf_index += 3;
- if (stream->packet_number==0)
- buf_index += 3; /* PES extension */
- buf_index += 1; /* obligatory stuffing byte */
- }
- if (pts != AV_NOPTS_VALUE) {
- if (dts != pts)
- buf_index += 5 + 5;
- else
- buf_index += 5;
-
- } else {
- if (!s->is_mpeg2)
- buf_index++;
- }
-
- if (stream->id < 0xc0) {
- /* AC3/LPCM private data header */
- buf_index += 4;
- if (stream->id >= 0xa0) {
- int n;
- buf_index += 3;
- /* NOTE: we round the payload size to an integer number of
- LPCM samples */
- n = (s->packet_size - buf_index) % stream->lpcm_align;
- if (n)
- buf_index += (stream->lpcm_align - n);
- }
- }
-
- if (s->is_vcd && stream->id == AUDIO_ID)
- /* The VCD standard demands that 20 zero bytes follow
- each audio packet (see standard p. IV-8).*/
- buf_index+=20;
- }
- return s->packet_size - buf_index;
-}
-#endif
-
-/* Write an MPEG padding packet header. */
-static void put_padding_packet(AVFormatContext *ctx, ByteIOContext *pb,int packet_bytes)
-{
- MpegMuxContext *s = ctx->priv_data;
- int i;
-
- put_be32(pb, PADDING_STREAM);
- put_be16(pb, packet_bytes - 6);
- if (!s->is_mpeg2) {
- put_byte(pb, 0x0f);
- packet_bytes -= 7;
- } else
- packet_bytes -= 6;
-
- for(i=0;i<packet_bytes;i++)
- put_byte(pb, 0xff);
-}
-
-static int get_nb_frames(AVFormatContext *ctx, StreamInfo *stream, int len){
- int nb_frames=0;
- PacketDesc *pkt_desc= stream->premux_packet;
-
- while(len>0){
- if(pkt_desc->size == pkt_desc->unwritten_size)
- nb_frames++;
- len -= pkt_desc->unwritten_size;
- pkt_desc= pkt_desc->next;
- }
-
- return nb_frames;
-}
-
-/* flush the packet on stream stream_index */
-static int flush_packet(AVFormatContext *ctx, int stream_index,
- int64_t pts, int64_t dts, int64_t scr, int trailer_size)
-{
- MpegMuxContext *s = ctx->priv_data;
- StreamInfo *stream = ctx->streams[stream_index]->priv_data;
- uint8_t *buf_ptr;
- int size, payload_size, startcode, id, stuffing_size, i, header_len;
- int packet_size;
- uint8_t buffer[128];
- int zero_trail_bytes = 0;
- int pad_packet_bytes = 0;
- int pes_flags;
- int general_pack = 0; /*"general" pack without data specific to one stream?*/
- int nb_frames;
-
- id = stream->id;
-
-#if 0
- printf("packet ID=%2x PTS=%0.3f\n",
- id, pts / 90000.0);
-#endif
-
- buf_ptr = buffer;
-
- if ((s->packet_number % s->pack_header_freq) == 0 || s->last_scr != scr) {
- /* output pack and systems header if needed */
- size = put_pack_header(ctx, buf_ptr, scr);
- buf_ptr += size;
- s->last_scr= scr;
-
- if (s->is_vcd) {
- /* there is exactly one system header for each stream in a VCD MPEG,
- One in the very first video packet and one in the very first
- audio packet (see VCD standard p. IV-7 and IV-8).*/
-
- if (stream->packet_number==0) {
- size = put_system_header(ctx, buf_ptr, id);
- buf_ptr += size;
- }
- } else if (s->is_dvd) {
- if (stream->align_iframe || s->packet_number == 0){
- int PES_bytes_to_fill = s->packet_size - size - 10;
-
- if (pts != AV_NOPTS_VALUE) {
- if (dts != pts)
- PES_bytes_to_fill -= 5 + 5;
- else
- PES_bytes_to_fill -= 5;
- }
-
- if (stream->bytes_to_iframe == 0 || s->packet_number == 0) {
- size = put_system_header(ctx, buf_ptr, 0);
- buf_ptr += size;
- size = buf_ptr - buffer;
- put_buffer(&ctx->pb, buffer, size);
-
- put_be32(&ctx->pb, PRIVATE_STREAM_2);
- put_be16(&ctx->pb, 0x03d4); // length
- put_byte(&ctx->pb, 0x00); // substream ID, 00=PCI
- for (i = 0; i < 979; i++)
- put_byte(&ctx->pb, 0x00);
-
- put_be32(&ctx->pb, PRIVATE_STREAM_2);
- put_be16(&ctx->pb, 0x03fa); // length
- put_byte(&ctx->pb, 0x01); // substream ID, 01=DSI
- for (i = 0; i < 1017; i++)
- put_byte(&ctx->pb, 0x00);
-
- memset(buffer, 0, 128);
- buf_ptr = buffer;
- s->packet_number++;
- stream->align_iframe = 0;
- scr += s->packet_size*90000LL / (s->mux_rate*50LL); //FIXME rounding and first few bytes of each packet
- size = put_pack_header(ctx, buf_ptr, scr);
- s->last_scr= scr;
- buf_ptr += size;
- /* GOP Start */
- } else if (stream->bytes_to_iframe < PES_bytes_to_fill) {
- pad_packet_bytes = PES_bytes_to_fill - stream->bytes_to_iframe;
- }
- }
- } else {
- if ((s->packet_number % s->system_header_freq) == 0) {
- size = put_system_header(ctx, buf_ptr, 0);
- buf_ptr += size;
- }
- }
- }
- size = buf_ptr - buffer;
- put_buffer(&ctx->pb, buffer, size);
-
- packet_size = s->packet_size - size;
-
- if (s->is_vcd && id == AUDIO_ID)
- /* The VCD standard demands that 20 zero bytes follow
- each audio pack (see standard p. IV-8).*/
- zero_trail_bytes += 20;
-
- if ((s->is_vcd && stream->packet_number==0)
- || (s->is_svcd && s->packet_number==0)) {
- /* for VCD the first pack of each stream contains only the pack header,
- the system header and lots of padding (see VCD standard p. IV-6).
- In the case of an audio pack, 20 zero bytes are also added at
- the end.*/
- /* For SVCD we fill the very first pack to increase compatibility with
- some DVD players. Not mandated by the standard.*/
- if (s->is_svcd)
- general_pack = 1; /* the system header refers to both streams and no stream data*/
- pad_packet_bytes = packet_size - zero_trail_bytes;
- }
-
- packet_size -= pad_packet_bytes + zero_trail_bytes;
-
- if (packet_size > 0) {
-
- /* packet header size */
- packet_size -= 6;
-
- /* packet header */
- if (s->is_mpeg2) {
- header_len = 3;
- if (stream->packet_number==0)
- header_len += 3; /* PES extension */
- header_len += 1; /* obligatory stuffing byte */
- } else {
- header_len = 0;
- }
- if (pts != AV_NOPTS_VALUE) {
- if (dts != pts)
- header_len += 5 + 5;
- else
- header_len += 5;
- } else {
- if (!s->is_mpeg2)
- header_len++;
- }
-
- payload_size = packet_size - header_len;
- if (id < 0xc0) {
- startcode = PRIVATE_STREAM_1;
- payload_size -= 1;
- if (id >= 0x40) {
- payload_size -= 3;
- if (id >= 0xa0)
- payload_size -= 3;
- }
- } else {
- startcode = 0x100 + id;
- }
-
- stuffing_size = payload_size - av_fifo_size(&stream->fifo);
-
- // first byte does not fit -> reset pts/dts + stuffing
- if(payload_size <= trailer_size && pts != AV_NOPTS_VALUE){
- int timestamp_len=0;
- if(dts != pts)
- timestamp_len += 5;
- if(pts != AV_NOPTS_VALUE)
- timestamp_len += s->is_mpeg2 ? 5 : 4;
- pts=dts= AV_NOPTS_VALUE;
- header_len -= timestamp_len;
- if (s->is_dvd && stream->align_iframe) {
- pad_packet_bytes += timestamp_len;
- packet_size -= timestamp_len;
- } else {
- payload_size += timestamp_len;
- }
- stuffing_size += timestamp_len;
- if(payload_size > trailer_size)
- stuffing_size += payload_size - trailer_size;
- }
-
- if (pad_packet_bytes > 0 && pad_packet_bytes <= 7) { // can't use padding, so use stuffing
- packet_size += pad_packet_bytes;
- payload_size += pad_packet_bytes; // undo the previous adjustment
- if (stuffing_size < 0) {
- stuffing_size = pad_packet_bytes;
- } else {
- stuffing_size += pad_packet_bytes;
- }
- pad_packet_bytes = 0;
- }
-
- if (stuffing_size < 0)
- stuffing_size = 0;
- if (stuffing_size > 16) { /*<=16 for MPEG-1, <=32 for MPEG-2*/
- pad_packet_bytes += stuffing_size;
- packet_size -= stuffing_size;
- payload_size -= stuffing_size;
- stuffing_size = 0;
- }
-
- nb_frames= get_nb_frames(ctx, stream, payload_size - stuffing_size);
-
- put_be32(&ctx->pb, startcode);
-
- put_be16(&ctx->pb, packet_size);
-
- if (!s->is_mpeg2)
- for(i=0;i<stuffing_size;i++)
- put_byte(&ctx->pb, 0xff);
-
- if (s->is_mpeg2) {
- put_byte(&ctx->pb, 0x80); /* mpeg2 id */
-
- pes_flags=0;
-
- if (pts != AV_NOPTS_VALUE) {
- pes_flags |= 0x80;
- if (dts != pts)
- pes_flags |= 0x40;
- }
-
- /* Both the MPEG-2 and the SVCD standards demand that the
- P-STD_buffer_size field be included in the first packet of
- every stream. (see SVCD standard p. 26 V.2.3.1 and V.2.3.2
- and MPEG-2 standard 2.7.7) */
- if (stream->packet_number == 0)
- pes_flags |= 0x01;
-
- put_byte(&ctx->pb, pes_flags); /* flags */
- put_byte(&ctx->pb, header_len - 3 + stuffing_size);
-
- if (pes_flags & 0x80) /*write pts*/
- put_timestamp(&ctx->pb, (pes_flags & 0x40) ? 0x03 : 0x02, pts);
- if (pes_flags & 0x40) /*write dts*/
- put_timestamp(&ctx->pb, 0x01, dts);
-
- if (pes_flags & 0x01) { /*write pes extension*/
- put_byte(&ctx->pb, 0x10); /* flags */
-
- /* P-STD buffer info */
- if (id == AUDIO_ID)
- put_be16(&ctx->pb, 0x4000 | stream->max_buffer_size/128);
- else
- put_be16(&ctx->pb, 0x6000 | stream->max_buffer_size/1024);
- }
-
- } else {
- if (pts != AV_NOPTS_VALUE) {
- if (dts != pts) {
- put_timestamp(&ctx->pb, 0x03, pts);
- put_timestamp(&ctx->pb, 0x01, dts);
- } else {
- put_timestamp(&ctx->pb, 0x02, pts);
- }
- } else {
- put_byte(&ctx->pb, 0x0f);
- }
- }
-
- if (s->is_mpeg2) {
- /* special stuffing byte that is always written
- to prevent accidental generation of start codes. */
- put_byte(&ctx->pb, 0xff);
-
- for(i=0;i<stuffing_size;i++)
- put_byte(&ctx->pb, 0xff);
- }
-
- if (startcode == PRIVATE_STREAM_1) {
- put_byte(&ctx->pb, id);
- if (id >= 0xa0) {
- /* LPCM (XXX: check nb_frames) */
- put_byte(&ctx->pb, 7);
- put_be16(&ctx->pb, 4); /* skip 3 header bytes */
- put_byte(&ctx->pb, stream->lpcm_header[0]);
- put_byte(&ctx->pb, stream->lpcm_header[1]);
- put_byte(&ctx->pb, stream->lpcm_header[2]);
- } else if (id >= 0x40) {
- /* AC3 */
- put_byte(&ctx->pb, nb_frames);
- put_be16(&ctx->pb, trailer_size+1);
- }
- }
-
- /* output data */
- if(av_fifo_generic_read(&stream->fifo, payload_size - stuffing_size, &put_buffer, &ctx->pb) < 0)
- return -1;
- stream->bytes_to_iframe -= payload_size - stuffing_size;
- }else{
- payload_size=
- stuffing_size= 0;
- }
-
- if (pad_packet_bytes > 0)
- put_padding_packet(ctx,&ctx->pb, pad_packet_bytes);
-
- for(i=0;i<zero_trail_bytes;i++)
- put_byte(&ctx->pb, 0x00);
-
- put_flush_packet(&ctx->pb);
-
- s->packet_number++;
-
- /* only increase the stream packet number if this pack actually contains
- something that is specific to this stream! I.e. a dedicated header
- or some data.*/
- if (!general_pack)
- stream->packet_number++;
-
- return payload_size - stuffing_size;
-}
-
-static void put_vcd_padding_sector(AVFormatContext *ctx)
-{
- /* There are two ways to do this padding: writing a sector/pack
- of 0 values, or writing an MPEG padding pack. Both seem to
- work with most decoders, BUT the VCD standard only allows a 0-sector
- (see standard p. IV-4, IV-5).
- So a 0-sector it is...*/
-
- MpegMuxContext *s = ctx->priv_data;
- int i;
-
- for(i=0;i<s->packet_size;i++)
- put_byte(&ctx->pb, 0);
-
- s->vcd_padding_bytes_written += s->packet_size;
-
- put_flush_packet(&ctx->pb);
-
- /* increasing the packet number is correct. The SCR of the following packs
- is calculated from the packet_number and it has to include the padding
- sector (it represents the sector index, not the MPEG pack index)
- (see VCD standard p. IV-6)*/
- s->packet_number++;
-}
-
-#if 0 /* unused, remove? */
-static int64_t get_vcd_scr(AVFormatContext *ctx,int stream_index,int64_t pts)
-{
- MpegMuxContext *s = ctx->priv_data;
- int64_t scr;
-
- /* Since the data delivery rate is constant, SCR is computed
- using the formula C + i * 1200 where C is the start constant
- and i is the pack index.
- It is recommended that SCR 0 is at the beginning of the VCD front
- margin (a sequence of empty Form 2 sectors on the CD).
- It is recommended that the front margin is 30 sectors long, so
- we use C = 30*1200 = 36000
- (Note that even if the front margin is not 30 sectors the file
- will still be correct according to the standard. It just won't have
- the "recommended" value).*/
- scr = 36000 + s->packet_number * 1200;
-
- return scr;
-}
-#endif
-
-static int remove_decoded_packets(AVFormatContext *ctx, int64_t scr){
-// MpegMuxContext *s = ctx->priv_data;
- int i;
-
- for(i=0; i<ctx->nb_streams; i++){
- AVStream *st = ctx->streams[i];
- StreamInfo *stream = st->priv_data;
- PacketDesc *pkt_desc;
-
- while((pkt_desc= stream->predecode_packet)
- && scr > pkt_desc->dts){ //FIXME > vs >=
- if(stream->buffer_index < pkt_desc->size ||
- stream->predecode_packet == stream->premux_packet){
- av_log(ctx, AV_LOG_ERROR,
- "buffer underflow i=%d bufi=%d size=%d\n",
- i, stream->buffer_index, pkt_desc->size);
- break;
- }
- stream->buffer_index -= pkt_desc->size;
-
- stream->predecode_packet= pkt_desc->next;
- av_freep(&pkt_desc);
- }
- }
-
- return 0;
-}
-
-static int output_packet(AVFormatContext *ctx, int flush){
- MpegMuxContext *s = ctx->priv_data;
- AVStream *st;
- StreamInfo *stream;
- int i, avail_space, es_size, trailer_size;
- int best_i= -1;
- int best_score= INT_MIN;
- int ignore_constraints=0;
- int64_t scr= s->last_scr;
- PacketDesc *timestamp_packet;
- const int64_t max_delay= av_rescale(ctx->max_delay, 90000, AV_TIME_BASE);
-
-retry:
- for(i=0; i<ctx->nb_streams; i++){
- AVStream *st = ctx->streams[i];
- StreamInfo *stream = st->priv_data;
- const int avail_data= av_fifo_size(&stream->fifo);
- const int space= stream->max_buffer_size - stream->buffer_index;
- int rel_space= 1024*space / stream->max_buffer_size;
- PacketDesc *next_pkt= stream->premux_packet;
-
- /* for subtitle, a single PES packet must be generated,
- so we flush after every single subtitle packet */
- if(s->packet_size > avail_data && !flush
- && st->codec->codec_type != CODEC_TYPE_SUBTITLE)
- return 0;
- if(avail_data==0)
- continue;
- assert(avail_data>0);
-
- if(space < s->packet_size && !ignore_constraints)
- continue;
-
- if(next_pkt && next_pkt->dts - scr > max_delay)
- continue;
-
- if(rel_space > best_score){
- best_score= rel_space;
- best_i = i;
- avail_space= space;
- }
- }
-
- if(best_i < 0){
- int64_t best_dts= INT64_MAX;
-
- for(i=0; i<ctx->nb_streams; i++){
- AVStream *st = ctx->streams[i];
- StreamInfo *stream = st->priv_data;
- PacketDesc *pkt_desc= stream->predecode_packet;
- if(pkt_desc && pkt_desc->dts < best_dts)
- best_dts= pkt_desc->dts;
- }
-
-#if 0
- av_log(ctx, AV_LOG_DEBUG, "bumping scr, scr:%f, dts:%f\n",
- scr/90000.0, best_dts/90000.0);
-#endif
- if(best_dts == INT64_MAX)
- return 0;
-
- if(scr >= best_dts+1 && !ignore_constraints){
- av_log(ctx, AV_LOG_ERROR, "packet too large, ignoring buffer limits to mux it\n");
- ignore_constraints= 1;
- }
- scr= FFMAX(best_dts+1, scr);
- if(remove_decoded_packets(ctx, scr) < 0)
- return -1;
- goto retry;
- }
-
- assert(best_i >= 0);
-
- st = ctx->streams[best_i];
- stream = st->priv_data;
-
- assert(av_fifo_size(&stream->fifo) > 0);
-
- assert(avail_space >= s->packet_size || ignore_constraints);
-
- timestamp_packet= stream->premux_packet;
- if(timestamp_packet->unwritten_size == timestamp_packet->size){
- trailer_size= 0;
- }else{
- trailer_size= timestamp_packet->unwritten_size;
- timestamp_packet= timestamp_packet->next;
- }
-
- if(timestamp_packet){
-//av_log(ctx, AV_LOG_DEBUG, "dts:%f pts:%f scr:%f stream:%d\n", timestamp_packet->dts/90000.0, timestamp_packet->pts/90000.0, scr/90000.0, best_i);
- es_size= flush_packet(ctx, best_i, timestamp_packet->pts, timestamp_packet->dts, scr, trailer_size);
- }else{
- assert(av_fifo_size(&stream->fifo) == trailer_size);
- es_size= flush_packet(ctx, best_i, AV_NOPTS_VALUE, AV_NOPTS_VALUE, scr, trailer_size);
- }
-
- if (s->is_vcd) {
- /* Write one or more padding sectors, if necessary, to reach
- the constant overall bitrate.*/
- int vcd_pad_bytes;
-
- while((vcd_pad_bytes = get_vcd_padding_size(ctx,stream->premux_packet->pts) ) >= s->packet_size){ //FIXME pts cannot be correct here
- put_vcd_padding_sector(ctx);
- s->last_scr += s->packet_size*90000LL / (s->mux_rate*50LL); //FIXME rounding and first few bytes of each packet
- }
- }
-
- stream->buffer_index += es_size;
- s->last_scr += s->packet_size*90000LL / (s->mux_rate*50LL); //FIXME rounding and first few bytes of each packet
-
- while(stream->premux_packet && stream->premux_packet->unwritten_size <= es_size){
- es_size -= stream->premux_packet->unwritten_size;
- stream->premux_packet= stream->premux_packet->next;
- }
- if(es_size)
- stream->premux_packet->unwritten_size -= es_size;
-
- if(remove_decoded_packets(ctx, s->last_scr) < 0)
- return -1;
-
- return 1;
-}
-
-static int mpeg_mux_write_packet(AVFormatContext *ctx, AVPacket *pkt)
-{
- MpegMuxContext *s = ctx->priv_data;
- int stream_index= pkt->stream_index;
- int size= pkt->size;
- uint8_t *buf= pkt->data;
- AVStream *st = ctx->streams[stream_index];
- StreamInfo *stream = st->priv_data;
- int64_t pts, dts;
- PacketDesc *pkt_desc;
- const int preload= av_rescale(ctx->preload, 90000, AV_TIME_BASE);
- const int is_iframe = st->codec->codec_type == CODEC_TYPE_VIDEO && (pkt->flags & PKT_FLAG_KEY);
-
- pts= pkt->pts;
- dts= pkt->dts;
-
- if(pts != AV_NOPTS_VALUE) pts += preload;
- if(dts != AV_NOPTS_VALUE) dts += preload;
-
-//av_log(ctx, AV_LOG_DEBUG, "dts:%f pts:%f flags:%d stream:%d nopts:%d\n", dts/90000.0, pts/90000.0, pkt->flags, pkt->stream_index, pts != AV_NOPTS_VALUE);
- if (!stream->premux_packet)
- stream->next_packet = &stream->premux_packet;
- *stream->next_packet=
- pkt_desc= av_mallocz(sizeof(PacketDesc));
- pkt_desc->pts= pts;
- pkt_desc->dts= dts;
- pkt_desc->unwritten_size=
- pkt_desc->size= size;
- if(!stream->predecode_packet)
- stream->predecode_packet= pkt_desc;
- stream->next_packet= &pkt_desc->next;
-
- av_fifo_realloc(&stream->fifo, av_fifo_size(&stream->fifo) + size + 1);
-
- if (s->is_dvd){
- if (is_iframe && (s->packet_number == 0 || (pts - stream->vobu_start_pts >= 36000))) { // min VOBU length 0.4 seconds (mpucoder)
- stream->bytes_to_iframe = av_fifo_size(&stream->fifo);
- stream->align_iframe = 1;
- stream->vobu_start_pts = pts;
- } else {
- stream->align_iframe = 0;
- }
- }
-
- av_fifo_write(&stream->fifo, buf, size);
-
- for(;;){
- int ret= output_packet(ctx, 0);
- if(ret<=0)
- return ret;
- }
-}
-
-static int mpeg_mux_end(AVFormatContext *ctx)
-{
-// MpegMuxContext *s = ctx->priv_data;
- StreamInfo *stream;
- int i;
-
- for(;;){
- int ret= output_packet(ctx, 1);
- if(ret<0)
- return ret;
- else if(ret==0)
- break;
- }
-
- /* End header according to MPEG1 systems standard. We do not write
- it as it is usually not needed by decoders and because it
- complicates MPEG stream concatenation. */
- //put_be32(&ctx->pb, ISO_11172_END_CODE);
- //put_flush_packet(&ctx->pb);
-
- for(i=0;i<ctx->nb_streams;i++) {
- stream = ctx->streams[i]->priv_data;
-
- assert(av_fifo_size(&stream->fifo) == 0);
- av_fifo_free(&stream->fifo);
- }
- return 0;
-}
-#endif //CONFIG_MUXERS
-
/*********************************************/
/* demux code */
@@ -1763,81 +535,6 @@ static int64_t mpegps_read_dts(AVFormatC
return dts;
}
-#ifdef CONFIG_MPEG1SYSTEM_MUXER
-AVOutputFormat mpeg1system_muxer = {
- "mpeg",
- "MPEG1 System format",
- "video/mpeg",
- "mpg,mpeg",
- sizeof(MpegMuxContext),
- CODEC_ID_MP2,
- CODEC_ID_MPEG1VIDEO,
- mpeg_mux_init,
- mpeg_mux_write_packet,
- mpeg_mux_end,
-};
-#endif
-#ifdef CONFIG_MPEG1VCD_MUXER
-AVOutputFormat mpeg1vcd_muxer = {
- "vcd",
- "MPEG1 System format (VCD)",
- "video/mpeg",
- NULL,
- sizeof(MpegMuxContext),
- CODEC_ID_MP2,
- CODEC_ID_MPEG1VIDEO,
- mpeg_mux_init,
- mpeg_mux_write_packet,
- mpeg_mux_end,
-};
-#endif
-#ifdef CONFIG_MPEG2VOB_MUXER
-AVOutputFormat mpeg2vob_muxer = {
- "vob",
- "MPEG2 PS format (VOB)",
- "video/mpeg",
- "vob",
- sizeof(MpegMuxContext),
- CODEC_ID_MP2,
- CODEC_ID_MPEG2VIDEO,
- mpeg_mux_init,
- mpeg_mux_write_packet,
- mpeg_mux_end,
-};
-#endif
-
-/* Same as mpeg2vob_mux except that the pack size is 2324 */
-#ifdef CONFIG_MPEG2SVCD_MUXER
-AVOutputFormat mpeg2svcd_muxer = {
- "svcd",
- "MPEG2 PS format (VOB)",
- "video/mpeg",
- "vob",
- sizeof(MpegMuxContext),
- CODEC_ID_MP2,
- CODEC_ID_MPEG2VIDEO,
- mpeg_mux_init,
- mpeg_mux_write_packet,
- mpeg_mux_end,
-};
-#endif
-
-/* Same as mpeg2vob_mux except the 'is_dvd' flag is set to produce NAV pkts */
-#ifdef CONFIG_MPEG2DVD_MUXER
-AVOutputFormat mpeg2dvd_muxer = {
- "dvd",
- "MPEG2 PS format (DVD VOB)",
- "video/mpeg",
- "dvd",
- sizeof(MpegMuxContext),
- CODEC_ID_MP2,
- CODEC_ID_MPEG2VIDEO,
- mpeg_mux_init,
- mpeg_mux_write_packet,
- mpeg_mux_end,
-};
-#endif
-
#ifdef CONFIG_MPEGPS_DEMUXER
AVInputFormat mpegps_demuxer = {
"mpeg",
Copied: trunk/libavformat/mpeg.h (from r9381, /trunk/libavformat/mpeg.c)
==============================================================================
--- /trunk/libavformat/mpeg.c (original)
+++ trunk/libavformat/mpeg.h Thu Jun 21 11:39:29 2007
@@ -1,5 +1,5 @@
/*
- * MPEG1/2 muxer and demuxer
+ * MPEG1/2 muxer and demuxer common defines
* Copyright (c) 2000, 2001, 2002 Fabrice Bellard.
*
* This file is part of FFmpeg.
@@ -18,61 +18,9 @@
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
-#include "avformat.h"
-#include "bitstream.h"
-#include "fifo.h"
-
-#define MAX_PAYLOAD_SIZE 4096
-//#define DEBUG_SEEK
-#undef NDEBUG
-#include <assert.h>
-
-typedef struct PacketDesc {
- int64_t pts;
- int64_t dts;
- int size;
- int unwritten_size;
- int flags;
- struct PacketDesc *next;
-} PacketDesc;
-
-typedef struct {
- AVFifoBuffer fifo;
- uint8_t id;
- int max_buffer_size; /* in bytes */
- int buffer_index;
- PacketDesc *predecode_packet;
- PacketDesc *premux_packet;
- PacketDesc **next_packet;
- int packet_number;
- uint8_t lpcm_header[3];
- int lpcm_align;
- int bytes_to_iframe;
- int align_iframe;
- int64_t vobu_start_pts;
-} StreamInfo;
-
-typedef struct {
- int packet_size; /* required packet size */
- int packet_number;
- int pack_header_freq; /* frequency (in packets^-1) at which we send pack headers */
- int system_header_freq;
- int system_header_size;
- int mux_rate; /* bitrate in units of 50 bytes/s */
- /* stream info */
- int audio_bound;
- int video_bound;
- int is_mpeg2;
- int is_vcd;
- int is_svcd;
- int is_dvd;
- int64_t last_scr; /* current system clock */
-
- double vcd_padding_bitrate; //FIXME floats
- int64_t vcd_padding_bytes_written;
-
-} MpegMuxContext;
+#ifndef AVFORMAT_MPEG_H
+#define AVFORMAT_MPEG_H
#define PACK_START_CODE ((unsigned int)0x000001ba)
#define SYSTEM_HEADER_START_CODE ((unsigned int)0x000001bb)
@@ -87,7 +35,6 @@ typedef struct {
#define PADDING_STREAM 0x1be
#define PRIVATE_STREAM_2 0x1bf
-
#define AUDIO_ID 0xc0
#define VIDEO_ID 0xe0
#define AC3_ID 0x80
@@ -110,1745 +57,4 @@ typedef struct {
static const int lpcm_freq_tab[4] = { 48000, 96000, 44100, 32000 };
-#ifdef CONFIG_MUXERS
-AVOutputFormat mpeg1system_muxer;
-AVOutputFormat mpeg1vcd_muxer;
-AVOutputFormat mpeg2vob_muxer;
-AVOutputFormat mpeg2svcd_muxer;
-AVOutputFormat mpeg2dvd_muxer;
-
-static int put_pack_header(AVFormatContext *ctx,
- uint8_t *buf, int64_t timestamp)
-{
- MpegMuxContext *s = ctx->priv_data;
- PutBitContext pb;
-
- init_put_bits(&pb, buf, 128);
-
- put_bits(&pb, 32, PACK_START_CODE);
- if (s->is_mpeg2) {
- put_bits(&pb, 2, 0x1);
- } else {
- put_bits(&pb, 4, 0x2);
- }
- put_bits(&pb, 3, (uint32_t)((timestamp >> 30) & 0x07));
- put_bits(&pb, 1, 1);
- put_bits(&pb, 15, (uint32_t)((timestamp >> 15) & 0x7fff));
- put_bits(&pb, 1, 1);
- put_bits(&pb, 15, (uint32_t)((timestamp) & 0x7fff));
- put_bits(&pb, 1, 1);
- if (s->is_mpeg2) {
- /* clock extension */
- put_bits(&pb, 9, 0);
- }
- put_bits(&pb, 1, 1);
- put_bits(&pb, 22, s->mux_rate);
- put_bits(&pb, 1, 1);
- if (s->is_mpeg2) {
- put_bits(&pb, 1, 1);
- put_bits(&pb, 5, 0x1f); /* reserved */
- put_bits(&pb, 3, 0); /* stuffing length */
- }
- flush_put_bits(&pb);
- return pbBufPtr(&pb) - pb.buf;
-}
-
-static int put_system_header(AVFormatContext *ctx, uint8_t *buf,int only_for_stream_id)
-{
- MpegMuxContext *s = ctx->priv_data;
- int size, i, private_stream_coded, id;
- PutBitContext pb;
-
- init_put_bits(&pb, buf, 128);
-
- put_bits(&pb, 32, SYSTEM_HEADER_START_CODE);
- put_bits(&pb, 16, 0);
- put_bits(&pb, 1, 1);
-
- put_bits(&pb, 22, s->mux_rate); /* maximum bit rate of the multiplexed stream */
- put_bits(&pb, 1, 1); /* marker */
- if (s->is_vcd && only_for_stream_id==VIDEO_ID) {
- /* This header applies only to the video stream (see VCD standard p. IV-7)*/
- put_bits(&pb, 6, 0);
- } else
- put_bits(&pb, 6, s->audio_bound);
-
- if (s->is_vcd) {
- /* see VCD standard, p. IV-7*/
- put_bits(&pb, 1, 0);
- put_bits(&pb, 1, 1);
- } else {
- put_bits(&pb, 1, 0); /* variable bitrate*/
- put_bits(&pb, 1, 0); /* non constrainted bit stream */
- }
-
- if (s->is_vcd || s->is_dvd) {
- /* see VCD standard p IV-7 */
- put_bits(&pb, 1, 1); /* audio locked */
- put_bits(&pb, 1, 1); /* video locked */
- } else {
- put_bits(&pb, 1, 0); /* audio locked */
- put_bits(&pb, 1, 0); /* video locked */
- }
-
- put_bits(&pb, 1, 1); /* marker */
-
- if (s->is_vcd && only_for_stream_id==AUDIO_ID) {
- /* This header applies only to the audio stream (see VCD standard p. IV-7)*/
- put_bits(&pb, 5, 0);
- } else
- put_bits(&pb, 5, s->video_bound);
-
- if (s->is_dvd) {
- put_bits(&pb, 1, 0); /* packet_rate_restriction_flag */
- put_bits(&pb, 7, 0x7f); /* reserved byte */
- } else
- put_bits(&pb, 8, 0xff); /* reserved byte */
-
- /* DVD-Video Stream_bound entries
- id (0xB9) video, maximum P-STD for stream 0xE0. (P-STD_buffer_bound_scale = 1)
- id (0xB8) audio, maximum P-STD for any MPEG audio (0xC0 to 0xC7) streams. If there are none set to 4096 (32x128). (P-STD_buffer_bound_scale = 0)
- id (0xBD) private stream 1 (audio other than MPEG and subpictures). (P-STD_buffer_bound_scale = 1)
- id (0xBF) private stream 2, NAV packs, set to 2x1024. */
- if (s->is_dvd) {
-
- int P_STD_max_video = 0;
- int P_STD_max_mpeg_audio = 0;
- int P_STD_max_mpeg_PS1 = 0;
-
- for(i=0;i<ctx->nb_streams;i++) {
- StreamInfo *stream = ctx->streams[i]->priv_data;
-
- id = stream->id;
- if (id == 0xbd && stream->max_buffer_size > P_STD_max_mpeg_PS1) {
- P_STD_max_mpeg_PS1 = stream->max_buffer_size;
- } else if (id >= 0xc0 && id <= 0xc7 && stream->max_buffer_size > P_STD_max_mpeg_audio) {
- P_STD_max_mpeg_audio = stream->max_buffer_size;
- } else if (id == 0xe0 && stream->max_buffer_size > P_STD_max_video) {
- P_STD_max_video = stream->max_buffer_size;
- }
- }
-
- /* video */
- put_bits(&pb, 8, 0xb9); /* stream ID */
- put_bits(&pb, 2, 3);
- put_bits(&pb, 1, 1);
- put_bits(&pb, 13, P_STD_max_video / 1024);
-
- /* audio */
- if (P_STD_max_mpeg_audio == 0)
- P_STD_max_mpeg_audio = 4096;
- put_bits(&pb, 8, 0xb8); /* stream ID */
- put_bits(&pb, 2, 3);
- put_bits(&pb, 1, 0);
- put_bits(&pb, 13, P_STD_max_mpeg_audio / 128);
-
- /* private stream 1 */
- put_bits(&pb, 8, 0xbd); /* stream ID */
- put_bits(&pb, 2, 3);
- put_bits(&pb, 1, 0);
- put_bits(&pb, 13, P_STD_max_mpeg_PS1 / 128);
-
- /* private stream 2 */
- put_bits(&pb, 8, 0xbf); /* stream ID */
- put_bits(&pb, 2, 3);
- put_bits(&pb, 1, 1);
- put_bits(&pb, 13, 2);
- }
- else {
- /* audio stream info */
- private_stream_coded = 0;
- for(i=0;i<ctx->nb_streams;i++) {
- StreamInfo *stream = ctx->streams[i]->priv_data;
-
-
- /* For VCDs, only include the stream info for the stream
- that the pack which contains this system belongs to.
- (see VCD standard p. IV-7) */
- if ( !s->is_vcd || stream->id==only_for_stream_id
- || only_for_stream_id==0) {
-
- id = stream->id;
- if (id < 0xc0) {
- /* special case for private streams (AC3 use that) */
- if (private_stream_coded)
- continue;
- private_stream_coded = 1;
- id = 0xbd;
- }
- put_bits(&pb, 8, id); /* stream ID */
- put_bits(&pb, 2, 3);
- if (id < 0xe0) {
- /* audio */
- put_bits(&pb, 1, 0);
- put_bits(&pb, 13, stream->max_buffer_size / 128);
- } else {
- /* video */
- put_bits(&pb, 1, 1);
- put_bits(&pb, 13, stream->max_buffer_size / 1024);
- }
- }
- }
- }
-
- flush_put_bits(&pb);
- size = pbBufPtr(&pb) - pb.buf;
- /* patch packet size */
- buf[4] = (size - 6) >> 8;
- buf[5] = (size - 6) & 0xff;
-
- return size;
-}
-
-static int get_system_header_size(AVFormatContext *ctx)
-{
- int buf_index, i, private_stream_coded;
- StreamInfo *stream;
- MpegMuxContext *s = ctx->priv_data;
-
- if (s->is_dvd)
- return 18; // DVD-Video system headers are 18 bytes fixed length.
-
- buf_index = 12;
- private_stream_coded = 0;
- for(i=0;i<ctx->nb_streams;i++) {
- stream = ctx->streams[i]->priv_data;
- if (stream->id < 0xc0) {
- if (private_stream_coded)
- continue;
- private_stream_coded = 1;
- }
- buf_index += 3;
- }
- return buf_index;
-}
-
-static int mpeg_mux_init(AVFormatContext *ctx)
-{
- MpegMuxContext *s = ctx->priv_data;
- int bitrate, i, mpa_id, mpv_id, mps_id, ac3_id, dts_id, lpcm_id, j;
- AVStream *st;
- StreamInfo *stream;
- int audio_bitrate;
- int video_bitrate;
-
- s->packet_number = 0;
- s->is_vcd = (ctx->oformat == &mpeg1vcd_muxer);
- s->is_svcd = (ctx->oformat == &mpeg2svcd_muxer);
- s->is_mpeg2 = (ctx->oformat == &mpeg2vob_muxer || ctx->oformat == &mpeg2svcd_muxer || ctx->oformat == &mpeg2dvd_muxer);
- s->is_dvd = (ctx->oformat == &mpeg2dvd_muxer);
-
- if(ctx->packet_size)
- s->packet_size = ctx->packet_size;
- else
- s->packet_size = 2048;
-
- s->vcd_padding_bytes_written = 0;
- s->vcd_padding_bitrate=0;
-
- s->audio_bound = 0;
- s->video_bound = 0;
- mpa_id = AUDIO_ID;
- ac3_id = AC3_ID;
- dts_id = DTS_ID;
- mpv_id = VIDEO_ID;
- mps_id = SUB_ID;
- lpcm_id = LPCM_ID;
- for(i=0;i<ctx->nb_streams;i++) {
- st = ctx->streams[i];
- stream = av_mallocz(sizeof(StreamInfo));
- if (!stream)
- goto fail;
- st->priv_data = stream;
-
- av_set_pts_info(st, 64, 1, 90000);
-
- switch(st->codec->codec_type) {
- case CODEC_TYPE_AUDIO:
- if (st->codec->codec_id == CODEC_ID_AC3) {
- stream->id = ac3_id++;
- } else if (st->codec->codec_id == CODEC_ID_DTS) {
- stream->id = dts_id++;
- } else if (st->codec->codec_id == CODEC_ID_PCM_S16BE) {
- stream->id = lpcm_id++;
- for(j = 0; j < 4; j++) {
- if (lpcm_freq_tab[j] == st->codec->sample_rate)
- break;
- }
- if (j == 4)
- goto fail;
- if (st->codec->channels > 8)
- return -1;
- stream->lpcm_header[0] = 0x0c;
- stream->lpcm_header[1] = (st->codec->channels - 1) | (j << 4);
- stream->lpcm_header[2] = 0x80;
- stream->lpcm_align = st->codec->channels * 2;
- } else {
- stream->id = mpa_id++;
- }
-
- /* This value HAS to be used for VCD (see VCD standard, p. IV-7).
- Right now it is also used for everything else.*/
- stream->max_buffer_size = 4 * 1024;
- s->audio_bound++;
- break;
- case CODEC_TYPE_VIDEO:
- stream->id = mpv_id++;
- if (st->codec->rc_buffer_size)
- stream->max_buffer_size = 6*1024 + st->codec->rc_buffer_size/8;
- else
- stream->max_buffer_size = 230*1024; //FIXME this is probably too small as default
-#if 0
- /* see VCD standard, p. IV-7*/
- stream->max_buffer_size = 46 * 1024;
- else
- /* This value HAS to be used for SVCD (see SVCD standard, p. 26 V.2.3.2).
- Right now it is also used for everything else.*/
- stream->max_buffer_size = 230 * 1024;
-#endif
- s->video_bound++;
- break;
- case CODEC_TYPE_SUBTITLE:
- stream->id = mps_id++;
- stream->max_buffer_size = 16 * 1024;
- break;
- default:
- return -1;
- }
- av_fifo_init(&stream->fifo, 16);
- }
- bitrate = 0;
- audio_bitrate = 0;
- video_bitrate = 0;
- for(i=0;i<ctx->nb_streams;i++) {
- int codec_rate;
- st = ctx->streams[i];
- stream = (StreamInfo*) st->priv_data;
-
- if(st->codec->rc_max_rate || stream->id==VIDEO_ID)
- codec_rate= st->codec->rc_max_rate;
- else
- codec_rate= st->codec->bit_rate;
-
- if(!codec_rate)
- codec_rate= (1<<21)*8*50/ctx->nb_streams;
-
- bitrate += codec_rate;
-
- if (stream->id==AUDIO_ID)
- audio_bitrate += codec_rate;
- else if (stream->id==VIDEO_ID)
- video_bitrate += codec_rate;
- }
-
- if(ctx->mux_rate){
- s->mux_rate= (ctx->mux_rate + (8 * 50) - 1) / (8 * 50);
- } else {
- /* we increase slightly the bitrate to take into account the
- headers. XXX: compute it exactly */
- bitrate += bitrate*5/100;
- bitrate += 10000;
- s->mux_rate = (bitrate + (8 * 50) - 1) / (8 * 50);
- }
-
- if (s->is_vcd) {
- double overhead_rate;
-
- /* The VCD standard mandates that the mux_rate field is 3528
- (see standard p. IV-6).
- The value is actually "wrong", i.e. if you calculate
- it using the normal formula and the 75 sectors per second transfer
- rate you get a different value because the real pack size is 2324,
- not 2352. But the standard explicitly specifies that the mux_rate
- field in the header must have this value.*/
-// s->mux_rate=2352 * 75 / 50; /* = 3528*/
-
- /* The VCD standard states that the muxed stream must be
- exactly 75 packs / second (the data rate of a single speed cdrom).
- Since the video bitrate (probably 1150000 bits/sec) will be below
- the theoretical maximum we have to add some padding packets
- to make up for the lower data rate.
- (cf. VCD standard p. IV-6 )*/
-
- /* Add the header overhead to the data rate.
- 2279 data bytes per audio pack, 2294 data bytes per video pack*/
- overhead_rate = ((audio_bitrate / 8.0) / 2279) * (2324 - 2279);
- overhead_rate += ((video_bitrate / 8.0) / 2294) * (2324 - 2294);
- overhead_rate *= 8;
-
- /* Add padding so that the full bitrate is 2324*75 bytes/sec */
- s->vcd_padding_bitrate = 2324 * 75 * 8 - (bitrate + overhead_rate);
- }
-
- if (s->is_vcd || s->is_mpeg2)
- /* every packet */
- s->pack_header_freq = 1;
- else
- /* every 2 seconds */
- s->pack_header_freq = 2 * bitrate / s->packet_size / 8;
-
- /* the above seems to make pack_header_freq zero sometimes */
- if (s->pack_header_freq == 0)
- s->pack_header_freq = 1;
-
- if (s->is_mpeg2)
- /* every 200 packets. Need to look at the spec. */
- s->system_header_freq = s->pack_header_freq * 40;
- else if (s->is_vcd)
- /* the standard mandates that there are only two system headers
- in the whole file: one in the first packet of each stream.
- (see standard p. IV-7 and IV-8) */
- s->system_header_freq = 0x7fffffff;
- else
- s->system_header_freq = s->pack_header_freq * 5;
-
- for(i=0;i<ctx->nb_streams;i++) {
- stream = ctx->streams[i]->priv_data;
- stream->packet_number = 0;
- }
- s->system_header_size = get_system_header_size(ctx);
- s->last_scr = 0;
- return 0;
- fail:
- for(i=0;i<ctx->nb_streams;i++) {
- av_free(ctx->streams[i]->priv_data);
- }
- return AVERROR(ENOMEM);
-}
-
-static inline void put_timestamp(ByteIOContext *pb, int id, int64_t timestamp)
-{
- put_byte(pb,
- (id << 4) |
- (((timestamp >> 30) & 0x07) << 1) |
- 1);
- put_be16(pb, (uint16_t)((((timestamp >> 15) & 0x7fff) << 1) | 1));
- put_be16(pb, (uint16_t)((((timestamp) & 0x7fff) << 1) | 1));
-}
-
-
-/* return the number of padding bytes that should be inserted into
- the multiplexed stream.*/
-static int get_vcd_padding_size(AVFormatContext *ctx, int64_t pts)
-{
- MpegMuxContext *s = ctx->priv_data;
- int pad_bytes = 0;
-
- if (s->vcd_padding_bitrate > 0 && pts!=AV_NOPTS_VALUE)
- {
- int64_t full_pad_bytes;
-
- full_pad_bytes = (int64_t)((s->vcd_padding_bitrate * (pts / 90000.0)) / 8.0); //FIXME this is wrong
- pad_bytes = (int) (full_pad_bytes - s->vcd_padding_bytes_written);
-
- if (pad_bytes<0)
- /* might happen if we have already padded to a later timestamp. This
- can occur if another stream has already advanced further.*/
- pad_bytes=0;
- }
-
- return pad_bytes;
-}
-
-
-#if 0 /* unused, remove? */
-/* return the exact available payload size for the next packet for
- stream 'stream_index'. 'pts' and 'dts' are only used to know if
- timestamps are needed in the packet header. */
-static int get_packet_payload_size(AVFormatContext *ctx, int stream_index,
- int64_t pts, int64_t dts)
-{
- MpegMuxContext *s = ctx->priv_data;
- int buf_index;
- StreamInfo *stream;
-
- stream = ctx->streams[stream_index]->priv_data;
-
- buf_index = 0;
- if (((s->packet_number % s->pack_header_freq) == 0)) {
- /* pack header size */
- if (s->is_mpeg2)
- buf_index += 14;
- else
- buf_index += 12;
-
- if (s->is_vcd) {
- /* there is exactly one system header for each stream in a VCD MPEG,
- One in the very first video packet and one in the very first
- audio packet (see VCD standard p. IV-7 and IV-8).*/
-
- if (stream->packet_number==0)
- /* The system headers refer only to the stream they occur in,
- so they have a constant size.*/
- buf_index += 15;
-
- } else {
- if ((s->packet_number % s->system_header_freq) == 0)
- buf_index += s->system_header_size;
- }
- }
-
- if ((s->is_vcd && stream->packet_number==0)
- || (s->is_svcd && s->packet_number==0))
- /* the first pack of each stream contains only the pack header,
- the system header and some padding (see VCD standard p. IV-6)
- Add the padding size, so that the actual payload becomes 0.*/
- buf_index += s->packet_size - buf_index;
- else {
- /* packet header size */
- buf_index += 6;
- if (s->is_mpeg2) {
- buf_index += 3;
- if (stream->packet_number==0)
- buf_index += 3; /* PES extension */
- buf_index += 1; /* obligatory stuffing byte */
- }
- if (pts != AV_NOPTS_VALUE) {
- if (dts != pts)
- buf_index += 5 + 5;
- else
- buf_index += 5;
-
- } else {
- if (!s->is_mpeg2)
- buf_index++;
- }
-
- if (stream->id < 0xc0) {
- /* AC3/LPCM private data header */
- buf_index += 4;
- if (stream->id >= 0xa0) {
- int n;
- buf_index += 3;
- /* NOTE: we round the payload size to an integer number of
- LPCM samples */
- n = (s->packet_size - buf_index) % stream->lpcm_align;
- if (n)
- buf_index += (stream->lpcm_align - n);
- }
- }
-
- if (s->is_vcd && stream->id == AUDIO_ID)
- /* The VCD standard demands that 20 zero bytes follow
- each audio packet (see standard p. IV-8).*/
- buf_index+=20;
- }
- return s->packet_size - buf_index;
-}
-#endif
-
-/* Write an MPEG padding packet header. */
-static void put_padding_packet(AVFormatContext *ctx, ByteIOContext *pb,int packet_bytes)
-{
- MpegMuxContext *s = ctx->priv_data;
- int i;
-
- put_be32(pb, PADDING_STREAM);
- put_be16(pb, packet_bytes - 6);
- if (!s->is_mpeg2) {
- put_byte(pb, 0x0f);
- packet_bytes -= 7;
- } else
- packet_bytes -= 6;
-
- for(i=0;i<packet_bytes;i++)
- put_byte(pb, 0xff);
-}
-
-static int get_nb_frames(AVFormatContext *ctx, StreamInfo *stream, int len){
- int nb_frames=0;
- PacketDesc *pkt_desc= stream->premux_packet;
-
- while(len>0){
- if(pkt_desc->size == pkt_desc->unwritten_size)
- nb_frames++;
- len -= pkt_desc->unwritten_size;
- pkt_desc= pkt_desc->next;
- }
-
- return nb_frames;
-}
-
-/* flush the packet on stream stream_index */
-static int flush_packet(AVFormatContext *ctx, int stream_index,
- int64_t pts, int64_t dts, int64_t scr, int trailer_size)
-{
- MpegMuxContext *s = ctx->priv_data;
- StreamInfo *stream = ctx->streams[stream_index]->priv_data;
- uint8_t *buf_ptr;
- int size, payload_size, startcode, id, stuffing_size, i, header_len;
- int packet_size;
- uint8_t buffer[128];
- int zero_trail_bytes = 0;
- int pad_packet_bytes = 0;
- int pes_flags;
- int general_pack = 0; /*"general" pack without data specific to one stream?*/
- int nb_frames;
-
- id = stream->id;
-
-#if 0
- printf("packet ID=%2x PTS=%0.3f\n",
- id, pts / 90000.0);
-#endif
-
- buf_ptr = buffer;
-
- if ((s->packet_number % s->pack_header_freq) == 0 || s->last_scr != scr) {
- /* output pack and systems header if needed */
- size = put_pack_header(ctx, buf_ptr, scr);
- buf_ptr += size;
- s->last_scr= scr;
-
- if (s->is_vcd) {
- /* there is exactly one system header for each stream in a VCD MPEG,
- One in the very first video packet and one in the very first
- audio packet (see VCD standard p. IV-7 and IV-8).*/
-
- if (stream->packet_number==0) {
- size = put_system_header(ctx, buf_ptr, id);
- buf_ptr += size;
- }
- } else if (s->is_dvd) {
- if (stream->align_iframe || s->packet_number == 0){
- int PES_bytes_to_fill = s->packet_size - size - 10;
-
- if (pts != AV_NOPTS_VALUE) {
- if (dts != pts)
- PES_bytes_to_fill -= 5 + 5;
- else
- PES_bytes_to_fill -= 5;
- }
-
- if (stream->bytes_to_iframe == 0 || s->packet_number == 0) {
- size = put_system_header(ctx, buf_ptr, 0);
- buf_ptr += size;
- size = buf_ptr - buffer;
- put_buffer(&ctx->pb, buffer, size);
-
- put_be32(&ctx->pb, PRIVATE_STREAM_2);
- put_be16(&ctx->pb, 0x03d4); // length
- put_byte(&ctx->pb, 0x00); // substream ID, 00=PCI
- for (i = 0; i < 979; i++)
- put_byte(&ctx->pb, 0x00);
-
- put_be32(&ctx->pb, PRIVATE_STREAM_2);
- put_be16(&ctx->pb, 0x03fa); // length
- put_byte(&ctx->pb, 0x01); // substream ID, 01=DSI
- for (i = 0; i < 1017; i++)
- put_byte(&ctx->pb, 0x00);
-
- memset(buffer, 0, 128);
- buf_ptr = buffer;
- s->packet_number++;
- stream->align_iframe = 0;
- scr += s->packet_size*90000LL / (s->mux_rate*50LL); //FIXME rounding and first few bytes of each packet
- size = put_pack_header(ctx, buf_ptr, scr);
- s->last_scr= scr;
- buf_ptr += size;
- /* GOP Start */
- } else if (stream->bytes_to_iframe < PES_bytes_to_fill) {
- pad_packet_bytes = PES_bytes_to_fill - stream->bytes_to_iframe;
- }
- }
- } else {
- if ((s->packet_number % s->system_header_freq) == 0) {
- size = put_system_header(ctx, buf_ptr, 0);
- buf_ptr += size;
- }
- }
- }
- size = buf_ptr - buffer;
- put_buffer(&ctx->pb, buffer, size);
-
- packet_size = s->packet_size - size;
-
- if (s->is_vcd && id == AUDIO_ID)
- /* The VCD standard demands that 20 zero bytes follow
- each audio pack (see standard p. IV-8).*/
- zero_trail_bytes += 20;
-
- if ((s->is_vcd && stream->packet_number==0)
- || (s->is_svcd && s->packet_number==0)) {
- /* for VCD the first pack of each stream contains only the pack header,
- the system header and lots of padding (see VCD standard p. IV-6).
- In the case of an audio pack, 20 zero bytes are also added at
- the end.*/
- /* For SVCD we fill the very first pack to increase compatibility with
- some DVD players. Not mandated by the standard.*/
- if (s->is_svcd)
- general_pack = 1; /* the system header refers to both streams and no stream data*/
- pad_packet_bytes = packet_size - zero_trail_bytes;
- }
-
- packet_size -= pad_packet_bytes + zero_trail_bytes;
-
- if (packet_size > 0) {
-
- /* packet header size */
- packet_size -= 6;
-
- /* packet header */
- if (s->is_mpeg2) {
- header_len = 3;
- if (stream->packet_number==0)
- header_len += 3; /* PES extension */
- header_len += 1; /* obligatory stuffing byte */
- } else {
- header_len = 0;
- }
- if (pts != AV_NOPTS_VALUE) {
- if (dts != pts)
- header_len += 5 + 5;
- else
- header_len += 5;
- } else {
- if (!s->is_mpeg2)
- header_len++;
- }
-
- payload_size = packet_size - header_len;
- if (id < 0xc0) {
- startcode = PRIVATE_STREAM_1;
- payload_size -= 1;
- if (id >= 0x40) {
- payload_size -= 3;
- if (id >= 0xa0)
- payload_size -= 3;
- }
- } else {
- startcode = 0x100 + id;
- }
-
- stuffing_size = payload_size - av_fifo_size(&stream->fifo);
-
- // first byte does not fit -> reset pts/dts + stuffing
- if(payload_size <= trailer_size && pts != AV_NOPTS_VALUE){
- int timestamp_len=0;
- if(dts != pts)
- timestamp_len += 5;
- if(pts != AV_NOPTS_VALUE)
- timestamp_len += s->is_mpeg2 ? 5 : 4;
- pts=dts= AV_NOPTS_VALUE;
- header_len -= timestamp_len;
- if (s->is_dvd && stream->align_iframe) {
- pad_packet_bytes += timestamp_len;
- packet_size -= timestamp_len;
- } else {
- payload_size += timestamp_len;
- }
- stuffing_size += timestamp_len;
- if(payload_size > trailer_size)
- stuffing_size += payload_size - trailer_size;
- }
-
- if (pad_packet_bytes > 0 && pad_packet_bytes <= 7) { // can't use padding, so use stuffing
- packet_size += pad_packet_bytes;
- payload_size += pad_packet_bytes; // undo the previous adjustment
- if (stuffing_size < 0) {
- stuffing_size = pad_packet_bytes;
- } else {
- stuffing_size += pad_packet_bytes;
- }
- pad_packet_bytes = 0;
- }
-
- if (stuffing_size < 0)
- stuffing_size = 0;
- if (stuffing_size > 16) { /*<=16 for MPEG-1, <=32 for MPEG-2*/
- pad_packet_bytes += stuffing_size;
- packet_size -= stuffing_size;
- payload_size -= stuffing_size;
- stuffing_size = 0;
- }
-
- nb_frames= get_nb_frames(ctx, stream, payload_size - stuffing_size);
-
- put_be32(&ctx->pb, startcode);
-
- put_be16(&ctx->pb, packet_size);
-
- if (!s->is_mpeg2)
- for(i=0;i<stuffing_size;i++)
- put_byte(&ctx->pb, 0xff);
-
- if (s->is_mpeg2) {
- put_byte(&ctx->pb, 0x80); /* mpeg2 id */
-
- pes_flags=0;
-
- if (pts != AV_NOPTS_VALUE) {
- pes_flags |= 0x80;
- if (dts != pts)
- pes_flags |= 0x40;
- }
-
- /* Both the MPEG-2 and the SVCD standards demand that the
- P-STD_buffer_size field be included in the first packet of
- every stream. (see SVCD standard p. 26 V.2.3.1 and V.2.3.2
- and MPEG-2 standard 2.7.7) */
- if (stream->packet_number == 0)
- pes_flags |= 0x01;
-
- put_byte(&ctx->pb, pes_flags); /* flags */
- put_byte(&ctx->pb, header_len - 3 + stuffing_size);
-
- if (pes_flags & 0x80) /*write pts*/
- put_timestamp(&ctx->pb, (pes_flags & 0x40) ? 0x03 : 0x02, pts);
- if (pes_flags & 0x40) /*write dts*/
- put_timestamp(&ctx->pb, 0x01, dts);
-
- if (pes_flags & 0x01) { /*write pes extension*/
- put_byte(&ctx->pb, 0x10); /* flags */
-
- /* P-STD buffer info */
- if (id == AUDIO_ID)
- put_be16(&ctx->pb, 0x4000 | stream->max_buffer_size/128);
- else
- put_be16(&ctx->pb, 0x6000 | stream->max_buffer_size/1024);
- }
-
- } else {
- if (pts != AV_NOPTS_VALUE) {
- if (dts != pts) {
- put_timestamp(&ctx->pb, 0x03, pts);
- put_timestamp(&ctx->pb, 0x01, dts);
- } else {
- put_timestamp(&ctx->pb, 0x02, pts);
- }
- } else {
- put_byte(&ctx->pb, 0x0f);
- }
- }
-
- if (s->is_mpeg2) {
- /* special stuffing byte that is always written
- to prevent accidental generation of start codes. */
- put_byte(&ctx->pb, 0xff);
-
- for(i=0;i<stuffing_size;i++)
- put_byte(&ctx->pb, 0xff);
- }
-
- if (startcode == PRIVATE_STREAM_1) {
- put_byte(&ctx->pb, id);
- if (id >= 0xa0) {
- /* LPCM (XXX: check nb_frames) */
- put_byte(&ctx->pb, 7);
- put_be16(&ctx->pb, 4); /* skip 3 header bytes */
- put_byte(&ctx->pb, stream->lpcm_header[0]);
- put_byte(&ctx->pb, stream->lpcm_header[1]);
- put_byte(&ctx->pb, stream->lpcm_header[2]);
- } else if (id >= 0x40) {
- /* AC3 */
- put_byte(&ctx->pb, nb_frames);
- put_be16(&ctx->pb, trailer_size+1);
- }
- }
-
- /* output data */
- if(av_fifo_generic_read(&stream->fifo, payload_size - stuffing_size, &put_buffer, &ctx->pb) < 0)
- return -1;
- stream->bytes_to_iframe -= payload_size - stuffing_size;
- }else{
- payload_size=
- stuffing_size= 0;
- }
-
- if (pad_packet_bytes > 0)
- put_padding_packet(ctx,&ctx->pb, pad_packet_bytes);
-
- for(i=0;i<zero_trail_bytes;i++)
- put_byte(&ctx->pb, 0x00);
-
- put_flush_packet(&ctx->pb);
-
- s->packet_number++;
-
- /* only increase the stream packet number if this pack actually contains
- something that is specific to this stream! I.e. a dedicated header
- or some data.*/
- if (!general_pack)
- stream->packet_number++;
-
- return payload_size - stuffing_size;
-}
-
-static void put_vcd_padding_sector(AVFormatContext *ctx)
-{
- /* There are two ways to do this padding: writing a sector/pack
- of 0 values, or writing an MPEG padding pack. Both seem to
- work with most decoders, BUT the VCD standard only allows a 0-sector
- (see standard p. IV-4, IV-5).
- So a 0-sector it is...*/
-
- MpegMuxContext *s = ctx->priv_data;
- int i;
-
- for(i=0;i<s->packet_size;i++)
- put_byte(&ctx->pb, 0);
-
- s->vcd_padding_bytes_written += s->packet_size;
-
- put_flush_packet(&ctx->pb);
-
- /* increasing the packet number is correct. The SCR of the following packs
- is calculated from the packet_number and it has to include the padding
- sector (it represents the sector index, not the MPEG pack index)
- (see VCD standard p. IV-6)*/
- s->packet_number++;
-}
-
-#if 0 /* unused, remove? */
-static int64_t get_vcd_scr(AVFormatContext *ctx,int stream_index,int64_t pts)
-{
- MpegMuxContext *s = ctx->priv_data;
- int64_t scr;
-
- /* Since the data delivery rate is constant, SCR is computed
- using the formula C + i * 1200 where C is the start constant
- and i is the pack index.
- It is recommended that SCR 0 is at the beginning of the VCD front
- margin (a sequence of empty Form 2 sectors on the CD).
- It is recommended that the front margin is 30 sectors long, so
- we use C = 30*1200 = 36000
- (Note that even if the front margin is not 30 sectors the file
- will still be correct according to the standard. It just won't have
- the "recommended" value).*/
- scr = 36000 + s->packet_number * 1200;
-
- return scr;
-}
-#endif
-
-static int remove_decoded_packets(AVFormatContext *ctx, int64_t scr){
-// MpegMuxContext *s = ctx->priv_data;
- int i;
-
- for(i=0; i<ctx->nb_streams; i++){
- AVStream *st = ctx->streams[i];
- StreamInfo *stream = st->priv_data;
- PacketDesc *pkt_desc;
-
- while((pkt_desc= stream->predecode_packet)
- && scr > pkt_desc->dts){ //FIXME > vs >=
- if(stream->buffer_index < pkt_desc->size ||
- stream->predecode_packet == stream->premux_packet){
- av_log(ctx, AV_LOG_ERROR,
- "buffer underflow i=%d bufi=%d size=%d\n",
- i, stream->buffer_index, pkt_desc->size);
- break;
- }
- stream->buffer_index -= pkt_desc->size;
-
- stream->predecode_packet= pkt_desc->next;
- av_freep(&pkt_desc);
- }
- }
-
- return 0;
-}
-
-static int output_packet(AVFormatContext *ctx, int flush){
- MpegMuxContext *s = ctx->priv_data;
- AVStream *st;
- StreamInfo *stream;
- int i, avail_space, es_size, trailer_size;
- int best_i= -1;
- int best_score= INT_MIN;
- int ignore_constraints=0;
- int64_t scr= s->last_scr;
- PacketDesc *timestamp_packet;
- const int64_t max_delay= av_rescale(ctx->max_delay, 90000, AV_TIME_BASE);
-
-retry:
- for(i=0; i<ctx->nb_streams; i++){
- AVStream *st = ctx->streams[i];
- StreamInfo *stream = st->priv_data;
- const int avail_data= av_fifo_size(&stream->fifo);
- const int space= stream->max_buffer_size - stream->buffer_index;
- int rel_space= 1024*space / stream->max_buffer_size;
- PacketDesc *next_pkt= stream->premux_packet;
-
- /* for subtitle, a single PES packet must be generated,
- so we flush after every single subtitle packet */
- if(s->packet_size > avail_data && !flush
- && st->codec->codec_type != CODEC_TYPE_SUBTITLE)
- return 0;
- if(avail_data==0)
- continue;
- assert(avail_data>0);
-
- if(space < s->packet_size && !ignore_constraints)
- continue;
-
- if(next_pkt && next_pkt->dts - scr > max_delay)
- continue;
-
- if(rel_space > best_score){
- best_score= rel_space;
- best_i = i;
- avail_space= space;
- }
- }
-
- if(best_i < 0){
- int64_t best_dts= INT64_MAX;
-
- for(i=0; i<ctx->nb_streams; i++){
- AVStream *st = ctx->streams[i];
- StreamInfo *stream = st->priv_data;
- PacketDesc *pkt_desc= stream->predecode_packet;
- if(pkt_desc && pkt_desc->dts < best_dts)
- best_dts= pkt_desc->dts;
- }
-
-#if 0
- av_log(ctx, AV_LOG_DEBUG, "bumping scr, scr:%f, dts:%f\n",
- scr/90000.0, best_dts/90000.0);
-#endif
- if(best_dts == INT64_MAX)
- return 0;
-
- if(scr >= best_dts+1 && !ignore_constraints){
- av_log(ctx, AV_LOG_ERROR, "packet too large, ignoring buffer limits to mux it\n");
- ignore_constraints= 1;
- }
- scr= FFMAX(best_dts+1, scr);
- if(remove_decoded_packets(ctx, scr) < 0)
- return -1;
- goto retry;
- }
-
- assert(best_i >= 0);
-
- st = ctx->streams[best_i];
- stream = st->priv_data;
-
- assert(av_fifo_size(&stream->fifo) > 0);
-
- assert(avail_space >= s->packet_size || ignore_constraints);
-
- timestamp_packet= stream->premux_packet;
- if(timestamp_packet->unwritten_size == timestamp_packet->size){
- trailer_size= 0;
- }else{
- trailer_size= timestamp_packet->unwritten_size;
- timestamp_packet= timestamp_packet->next;
- }
-
- if(timestamp_packet){
-//av_log(ctx, AV_LOG_DEBUG, "dts:%f pts:%f scr:%f stream:%d\n", timestamp_packet->dts/90000.0, timestamp_packet->pts/90000.0, scr/90000.0, best_i);
- es_size= flush_packet(ctx, best_i, timestamp_packet->pts, timestamp_packet->dts, scr, trailer_size);
- }else{
- assert(av_fifo_size(&stream->fifo) == trailer_size);
- es_size= flush_packet(ctx, best_i, AV_NOPTS_VALUE, AV_NOPTS_VALUE, scr, trailer_size);
- }
-
- if (s->is_vcd) {
- /* Write one or more padding sectors, if necessary, to reach
- the constant overall bitrate.*/
- int vcd_pad_bytes;
-
- while((vcd_pad_bytes = get_vcd_padding_size(ctx,stream->premux_packet->pts) ) >= s->packet_size){ //FIXME pts cannot be correct here
- put_vcd_padding_sector(ctx);
- s->last_scr += s->packet_size*90000LL / (s->mux_rate*50LL); //FIXME rounding and first few bytes of each packet
- }
- }
-
- stream->buffer_index += es_size;
- s->last_scr += s->packet_size*90000LL / (s->mux_rate*50LL); //FIXME rounding and first few bytes of each packet
-
- while(stream->premux_packet && stream->premux_packet->unwritten_size <= es_size){
- es_size -= stream->premux_packet->unwritten_size;
- stream->premux_packet= stream->premux_packet->next;
- }
- if(es_size)
- stream->premux_packet->unwritten_size -= es_size;
-
- if(remove_decoded_packets(ctx, s->last_scr) < 0)
- return -1;
-
- return 1;
-}
-
-static int mpeg_mux_write_packet(AVFormatContext *ctx, AVPacket *pkt)
-{
- MpegMuxContext *s = ctx->priv_data;
- int stream_index= pkt->stream_index;
- int size= pkt->size;
- uint8_t *buf= pkt->data;
- AVStream *st = ctx->streams[stream_index];
- StreamInfo *stream = st->priv_data;
- int64_t pts, dts;
- PacketDesc *pkt_desc;
- const int preload= av_rescale(ctx->preload, 90000, AV_TIME_BASE);
- const int is_iframe = st->codec->codec_type == CODEC_TYPE_VIDEO && (pkt->flags & PKT_FLAG_KEY);
-
- pts= pkt->pts;
- dts= pkt->dts;
-
- if(pts != AV_NOPTS_VALUE) pts += preload;
- if(dts != AV_NOPTS_VALUE) dts += preload;
-
-//av_log(ctx, AV_LOG_DEBUG, "dts:%f pts:%f flags:%d stream:%d nopts:%d\n", dts/90000.0, pts/90000.0, pkt->flags, pkt->stream_index, pts != AV_NOPTS_VALUE);
- if (!stream->premux_packet)
- stream->next_packet = &stream->premux_packet;
- *stream->next_packet=
- pkt_desc= av_mallocz(sizeof(PacketDesc));
- pkt_desc->pts= pts;
- pkt_desc->dts= dts;
- pkt_desc->unwritten_size=
- pkt_desc->size= size;
- if(!stream->predecode_packet)
- stream->predecode_packet= pkt_desc;
- stream->next_packet= &pkt_desc->next;
-
- av_fifo_realloc(&stream->fifo, av_fifo_size(&stream->fifo) + size + 1);
-
- if (s->is_dvd){
- if (is_iframe && (s->packet_number == 0 || (pts - stream->vobu_start_pts >= 36000))) { // min VOBU length 0.4 seconds (mpucoder)
- stream->bytes_to_iframe = av_fifo_size(&stream->fifo);
- stream->align_iframe = 1;
- stream->vobu_start_pts = pts;
- } else {
- stream->align_iframe = 0;
- }
- }
-
- av_fifo_write(&stream->fifo, buf, size);
-
- for(;;){
- int ret= output_packet(ctx, 0);
- if(ret<=0)
- return ret;
- }
-}
-
-static int mpeg_mux_end(AVFormatContext *ctx)
-{
-// MpegMuxContext *s = ctx->priv_data;
- StreamInfo *stream;
- int i;
-
- for(;;){
- int ret= output_packet(ctx, 1);
- if(ret<0)
- return ret;
- else if(ret==0)
- break;
- }
-
- /* End header according to MPEG1 systems standard. We do not write
- it as it is usually not needed by decoders and because it
- complicates MPEG stream concatenation. */
- //put_be32(&ctx->pb, ISO_11172_END_CODE);
- //put_flush_packet(&ctx->pb);
-
- for(i=0;i<ctx->nb_streams;i++) {
- stream = ctx->streams[i]->priv_data;
-
- assert(av_fifo_size(&stream->fifo) == 0);
- av_fifo_free(&stream->fifo);
- }
- return 0;
-}
-#endif //CONFIG_MUXERS
-
-/*********************************************/
-/* demux code */
-
-#define MAX_SYNC_SIZE 100000
-
-static int cdxa_probe(AVProbeData *p)
-{
- /* check file header */
- if (p->buf[0] == 'R' && p->buf[1] == 'I' &&
- p->buf[2] == 'F' && p->buf[3] == 'F' &&
- p->buf[8] == 'C' && p->buf[9] == 'D' &&
- p->buf[10] == 'X' && p->buf[11] == 'A')
- return AVPROBE_SCORE_MAX;
- else
- return 0;
-}
-
-static int mpegps_probe(AVProbeData *p)
-{
- uint32_t code= -1;
- int sys=0, pspack=0, priv1=0, vid=0, audio=0;
- int i;
- int score=0;
-
- score = cdxa_probe(p);
- if (score > 0) return score;
-
- /* Search for MPEG stream */
- for(i=0; i<p->buf_size; i++){
- code = (code<<8) + p->buf[i];
- if ((code & 0xffffff00) == 0x100) {
- if(code == SYSTEM_HEADER_START_CODE) sys++;
- else if(code == PRIVATE_STREAM_1) priv1++;
- else if(code == PACK_START_CODE) pspack++;
- else if((code & 0xf0) == VIDEO_ID) vid++;
- else if((code & 0xe0) == AUDIO_ID) audio++;
- }
- }
-
- if(vid || audio) /* invalid VDR files nd short PES streams */
- score= AVPROBE_SCORE_MAX/4;
-
-//av_log(NULL, AV_LOG_ERROR, "%d %d %d %d %d\n", sys, priv1, pspack,vid, audio);
- if(sys && sys*9 <= pspack*10)
- return AVPROBE_SCORE_MAX/2+2; // +1 for .mpg
- if((priv1 || vid || audio) && (priv1+vid+audio)*9 <= pspack*10)
- return AVPROBE_SCORE_MAX/2+2; // +1 for .mpg
- if((!!vid ^ !!audio) && (audio+vid > 1) && !sys && !pspack) /* PES stream */
- return AVPROBE_SCORE_MAX/2+2;
-
- //02-Penguin.flac has sys:0 priv1:0 pspack:0 vid:0 audio:1
- return score;
-}
-
-
-typedef struct MpegDemuxContext {
- int32_t header_state;
- unsigned char psm_es_type[256];
-} MpegDemuxContext;
-
-static int mpegps_read_header(AVFormatContext *s,
- AVFormatParameters *ap)
-{
- MpegDemuxContext *m = s->priv_data;
- m->header_state = 0xff;
- s->ctx_flags |= AVFMTCTX_NOHEADER;
-
- /* no need to do more */
- return 0;
-}
-
-static int64_t get_pts(ByteIOContext *pb, int c)
-{
- int64_t pts;
- int val;
-
- if (c < 0)
- c = get_byte(pb);
- pts = (int64_t)((c >> 1) & 0x07) << 30;
- val = get_be16(pb);
- pts |= (int64_t)(val >> 1) << 15;
- val = get_be16(pb);
- pts |= (int64_t)(val >> 1);
- return pts;
-}
-
-static int find_next_start_code(ByteIOContext *pb, int *size_ptr,
- int32_t *header_state)
-{
- unsigned int state, v;
- int val, n;
-
- state = *header_state;
- n = *size_ptr;
- while (n > 0) {
- if (url_feof(pb))
- break;
- v = get_byte(pb);
- n--;
- if (state == 0x000001) {
- state = ((state << 8) | v) & 0xffffff;
- val = state;
- goto found;
- }
- state = ((state << 8) | v) & 0xffffff;
- }
- val = -1;
- found:
- *header_state = state;
- *size_ptr = n;
- return val;
-}
-
-#if 0 /* unused, remove? */
-/* XXX: optimize */
-static int find_prev_start_code(ByteIOContext *pb, int *size_ptr)
-{
- int64_t pos, pos_start;
- int max_size, start_code;
-
- max_size = *size_ptr;
- pos_start = url_ftell(pb);
-
- /* in order to go faster, we fill the buffer */
- pos = pos_start - 16386;
- if (pos < 0)
- pos = 0;
- url_fseek(pb, pos, SEEK_SET);
- get_byte(pb);
-
- pos = pos_start;
- for(;;) {
- pos--;
- if (pos < 0 || (pos_start - pos) >= max_size) {
- start_code = -1;
- goto the_end;
- }
- url_fseek(pb, pos, SEEK_SET);
- start_code = get_be32(pb);
- if ((start_code & 0xffffff00) == 0x100)
- break;
- }
- the_end:
- *size_ptr = pos_start - pos;
- return start_code;
-}
-#endif
-
-/**
- * Extracts stream types from a program stream map
- * According to ISO/IEC 13818-1 ('MPEG-2 Systems') table 2-35
- *
- * @return number of bytes occupied by PSM in the bitstream
- */
-static long mpegps_psm_parse(MpegDemuxContext *m, ByteIOContext *pb)
-{
- int psm_length, ps_info_length, es_map_length;
-
- psm_length = get_be16(pb);
- get_byte(pb);
- get_byte(pb);
- ps_info_length = get_be16(pb);
-
- /* skip program_stream_info */
- url_fskip(pb, ps_info_length);
- es_map_length = get_be16(pb);
-
- /* at least one es available? */
- while (es_map_length >= 4){
- unsigned char type = get_byte(pb);
- unsigned char es_id = get_byte(pb);
- uint16_t es_info_length = get_be16(pb);
- /* remember mapping from stream id to stream type */
- m->psm_es_type[es_id] = type;
- /* skip program_stream_info */
- url_fskip(pb, es_info_length);
- es_map_length -= 4 + es_info_length;
- }
- get_be32(pb); /* crc32 */
- return 2 + psm_length;
-}
-
-/* read the next PES header. Return its position in ppos
- (if not NULL), and its start code, pts and dts.
- */
-static int mpegps_read_pes_header(AVFormatContext *s,
- int64_t *ppos, int *pstart_code,
- int64_t *ppts, int64_t *pdts)
-{
- MpegDemuxContext *m = s->priv_data;
- int len, size, startcode, c, flags, header_len;
- int pes_ext, ext2_len, id_ext, skip;
- int64_t pts, dts;
- int64_t last_sync= url_ftell(&s->pb);
-
- error_redo:
- url_fseek(&s->pb, last_sync, SEEK_SET);
- redo:
- /* next start code (should be immediately after) */
- m->header_state = 0xff;
- size = MAX_SYNC_SIZE;
- startcode = find_next_start_code(&s->pb, &size, &m->header_state);
- last_sync = url_ftell(&s->pb);
- //printf("startcode=%x pos=0x%"PRIx64"\n", startcode, url_ftell(&s->pb));
- if (startcode < 0)
- return AVERROR_IO;
- if (startcode == PACK_START_CODE)
- goto redo;
- if (startcode == SYSTEM_HEADER_START_CODE)
- goto redo;
- if (startcode == PADDING_STREAM ||
- startcode == PRIVATE_STREAM_2) {
- /* skip them */
- len = get_be16(&s->pb);
- url_fskip(&s->pb, len);
- goto redo;
- }
- if (startcode == PROGRAM_STREAM_MAP) {
- mpegps_psm_parse(m, &s->pb);
- goto redo;
- }
-
- /* find matching stream */
- if (!((startcode >= 0x1c0 && startcode <= 0x1df) ||
- (startcode >= 0x1e0 && startcode <= 0x1ef) ||
- (startcode == 0x1bd) || (startcode == 0x1fd)))
- goto redo;
- if (ppos) {
- *ppos = url_ftell(&s->pb) - 4;
- }
- len = get_be16(&s->pb);
- pts =
- dts = AV_NOPTS_VALUE;
- /* stuffing */
- for(;;) {
- if (len < 1)
- goto error_redo;
- c = get_byte(&s->pb);
- len--;
- /* XXX: for mpeg1, should test only bit 7 */
- if (c != 0xff)
- break;
- }
- if ((c & 0xc0) == 0x40) {
- /* buffer scale & size */
- get_byte(&s->pb);
- c = get_byte(&s->pb);
- len -= 2;
- }
- if ((c & 0xe0) == 0x20) {
- dts = pts = get_pts(&s->pb, c);
- len -= 4;
- if (c & 0x10){
- dts = get_pts(&s->pb, -1);
- len -= 5;
- }
- } else if ((c & 0xc0) == 0x80) {
- /* mpeg 2 PES */
-#if 0 /* some streams have this field set for no apparent reason */
- if ((c & 0x30) != 0) {
- /* Encrypted multiplex not handled */
- goto redo;
- }
-#endif
- flags = get_byte(&s->pb);
- header_len = get_byte(&s->pb);
- len -= 2;
- if (header_len > len)
- goto error_redo;
- len -= header_len;
- if (flags & 0x80) {
- dts = pts = get_pts(&s->pb, -1);
- header_len -= 5;
- if (flags & 0x40) {
- dts = get_pts(&s->pb, -1);
- header_len -= 5;
- }
- }
- if (flags & 0x01) { /* PES extension */
- pes_ext = get_byte(&s->pb);
- header_len--;
- if (pes_ext & 0x40) { /* pack header - should be zero in PS */
- goto error_redo;
- }
- /* Skip PES private data, program packet sequence counter and P-STD buffer */
- skip = (pes_ext >> 4) & 0xb;
- skip += skip & 0x9;
- url_fskip(&s->pb, skip);
- header_len -= skip;
-
- if (pes_ext & 0x01) { /* PES extension 2 */
- ext2_len = get_byte(&s->pb);
- header_len--;
- if ((ext2_len & 0x7f) > 0) {
- id_ext = get_byte(&s->pb);
- if ((id_ext & 0x80) == 0)
- startcode = ((startcode & 0xff) << 8) | id_ext;
- header_len--;
- }
- }
- }
- if(header_len < 0)
- goto error_redo;
- url_fskip(&s->pb, header_len);
- }
- else if( c!= 0xf )
- goto redo;
-
- if (startcode == PRIVATE_STREAM_1 && !m->psm_es_type[startcode & 0xff]) {
- startcode = get_byte(&s->pb);
- len--;
- if (startcode >= 0x80 && startcode <= 0xcf) {
- /* audio: skip header */
- get_byte(&s->pb);
- get_byte(&s->pb);
- get_byte(&s->pb);
- len -= 3;
- if (startcode >= 0xb0 && startcode <= 0xbf) {
- /* MLP/TrueHD audio has a 4-byte header */
- get_byte(&s->pb);
- len--;
- }
- }
- }
- if(len<0)
- goto error_redo;
- if(dts != AV_NOPTS_VALUE && ppos){
- int i;
- for(i=0; i<s->nb_streams; i++){
- if(startcode == s->streams[i]->id) {
- av_add_index_entry(s->streams[i], *ppos, dts, 0, 0, AVINDEX_KEYFRAME /* FIXME keyframe? */);
- }
- }
- }
-
- *pstart_code = startcode;
- *ppts = pts;
- *pdts = dts;
- return len;
-}
-
-static int mpegps_read_packet(AVFormatContext *s,
- AVPacket *pkt)
-{
- MpegDemuxContext *m = s->priv_data;
- AVStream *st;
- int len, startcode, i, type, codec_id = 0, es_type;
- int64_t pts, dts, dummy_pos; //dummy_pos is needed for the index building to work
-
- redo:
- len = mpegps_read_pes_header(s, &dummy_pos, &startcode, &pts, &dts);
- if (len < 0)
- return len;
-
- /* now find stream */
- for(i=0;i<s->nb_streams;i++) {
- st = s->streams[i];
- if (st->id == startcode)
- goto found;
- }
-
- es_type = m->psm_es_type[startcode & 0xff];
- if(es_type > 0){
- if(es_type == STREAM_TYPE_VIDEO_MPEG1){
- codec_id = CODEC_ID_MPEG2VIDEO;
- type = CODEC_TYPE_VIDEO;
- } else if(es_type == STREAM_TYPE_VIDEO_MPEG2){
- codec_id = CODEC_ID_MPEG2VIDEO;
- type = CODEC_TYPE_VIDEO;
- } else if(es_type == STREAM_TYPE_AUDIO_MPEG1 ||
- es_type == STREAM_TYPE_AUDIO_MPEG2){
- codec_id = CODEC_ID_MP3;
- type = CODEC_TYPE_AUDIO;
- } else if(es_type == STREAM_TYPE_AUDIO_AAC){
- codec_id = CODEC_ID_AAC;
- type = CODEC_TYPE_AUDIO;
- } else if(es_type == STREAM_TYPE_VIDEO_MPEG4){
- codec_id = CODEC_ID_MPEG4;
- type = CODEC_TYPE_VIDEO;
- } else if(es_type == STREAM_TYPE_VIDEO_H264){
- codec_id = CODEC_ID_H264;
- type = CODEC_TYPE_VIDEO;
- } else if(es_type == STREAM_TYPE_AUDIO_AC3){
- codec_id = CODEC_ID_AC3;
- type = CODEC_TYPE_AUDIO;
- } else {
- goto skip;
- }
- } else if (startcode >= 0x1e0 && startcode <= 0x1ef) {
- static const unsigned char avs_seqh[4] = { 0, 0, 1, 0xb0 };
- unsigned char buf[8];
- get_buffer(&s->pb, buf, 8);
- url_fseek(&s->pb, -8, SEEK_CUR);
- if(!memcmp(buf, avs_seqh, 4) && (buf[6] != 0 || buf[7] != 1))
- codec_id = CODEC_ID_CAVS;
- else
- codec_id = CODEC_ID_MPEG2VIDEO;
- type = CODEC_TYPE_VIDEO;
- } else if (startcode >= 0x1c0 && startcode <= 0x1df) {
- type = CODEC_TYPE_AUDIO;
- codec_id = CODEC_ID_MP2;
- } else if (startcode >= 0x80 && startcode <= 0x87) {
- type = CODEC_TYPE_AUDIO;
- codec_id = CODEC_ID_AC3;
- } else if ((startcode >= 0x88 && startcode <= 0x8f)
- ||( startcode >= 0x98 && startcode <= 0x9f)) {
- /* 0x90 - 0x97 is reserved for SDDS in DVD specs */
- type = CODEC_TYPE_AUDIO;
- codec_id = CODEC_ID_DTS;
- } else if (startcode >= 0xa0 && startcode <= 0xaf) {
- type = CODEC_TYPE_AUDIO;
- codec_id = CODEC_ID_PCM_S16BE;
- } else if (startcode >= 0xb0 && startcode <= 0xbf) {
- type = CODEC_TYPE_AUDIO;
- codec_id = CODEC_ID_MLP;
- } else if (startcode >= 0xc0 && startcode <= 0xcf) {
- /* Used for both AC-3 and E-AC-3 in EVOB files */
- type = CODEC_TYPE_AUDIO;
- codec_id = CODEC_ID_AC3;
- } else if (startcode >= 0x20 && startcode <= 0x3f) {
- type = CODEC_TYPE_SUBTITLE;
- codec_id = CODEC_ID_DVD_SUBTITLE;
- } else if (startcode >= 0xfd55 && startcode <= 0xfd5f) {
- type = CODEC_TYPE_VIDEO;
- codec_id = CODEC_ID_VC1;
- } else {
- skip:
- /* skip packet */
- url_fskip(&s->pb, len);
- goto redo;
- }
- /* no stream found: add a new stream */
- st = av_new_stream(s, startcode);
- if (!st)
- goto skip;
- st->codec->codec_type = type;
- st->codec->codec_id = codec_id;
- if (codec_id != CODEC_ID_PCM_S16BE)
- st->need_parsing = AVSTREAM_PARSE_FULL;
- found:
- if(st->discard >= AVDISCARD_ALL)
- goto skip;
- if (startcode >= 0xa0 && startcode <= 0xaf) {
- int b1, freq;
-
- /* for LPCM, we just skip the header and consider it is raw
- audio data */
- if (len <= 3)
- goto skip;
- get_byte(&s->pb); /* emphasis (1), muse(1), reserved(1), frame number(5) */
- b1 = get_byte(&s->pb); /* quant (2), freq(2), reserved(1), channels(3) */
- get_byte(&s->pb); /* dynamic range control (0x80 = off) */
- len -= 3;
- freq = (b1 >> 4) & 3;
- st->codec->sample_rate = lpcm_freq_tab[freq];
- st->codec->channels = 1 + (b1 & 7);
- st->codec->bit_rate = st->codec->channels * st->codec->sample_rate * 2;
- }
- av_new_packet(pkt, len);
- get_buffer(&s->pb, pkt->data, pkt->size);
- pkt->pts = pts;
- pkt->dts = dts;
- pkt->stream_index = st->index;
-#if 0
- av_log(s, AV_LOG_DEBUG, "%d: pts=%0.3f dts=%0.3f size=%d\n",
- pkt->stream_index, pkt->pts / 90000.0, pkt->dts / 90000.0, pkt->size);
-#endif
-
- return 0;
-}
-
-static int mpegps_read_close(AVFormatContext *s)
-{
- return 0;
-}
-
-static int64_t mpegps_read_dts(AVFormatContext *s, int stream_index,
- int64_t *ppos, int64_t pos_limit)
-{
- int len, startcode;
- int64_t pos, pts, dts;
-
- pos = *ppos;
-#ifdef DEBUG_SEEK
- printf("read_dts: pos=0x%"PRIx64" next=%d -> ", pos, find_next);
-#endif
- url_fseek(&s->pb, pos, SEEK_SET);
- for(;;) {
- len = mpegps_read_pes_header(s, &pos, &startcode, &pts, &dts);
- if (len < 0) {
-#ifdef DEBUG_SEEK
- printf("none (ret=%d)\n", len);
-#endif
- return AV_NOPTS_VALUE;
- }
- if (startcode == s->streams[stream_index]->id &&
- dts != AV_NOPTS_VALUE) {
- break;
- }
- url_fskip(&s->pb, len);
- }
-#ifdef DEBUG_SEEK
- printf("pos=0x%"PRIx64" dts=0x%"PRIx64" %0.3f\n", pos, dts, dts / 90000.0);
-#endif
- *ppos = pos;
- return dts;
-}
-
-#ifdef CONFIG_MPEG1SYSTEM_MUXER
-AVOutputFormat mpeg1system_muxer = {
- "mpeg",
- "MPEG1 System format",
- "video/mpeg",
- "mpg,mpeg",
- sizeof(MpegMuxContext),
- CODEC_ID_MP2,
- CODEC_ID_MPEG1VIDEO,
- mpeg_mux_init,
- mpeg_mux_write_packet,
- mpeg_mux_end,
-};
-#endif
-#ifdef CONFIG_MPEG1VCD_MUXER
-AVOutputFormat mpeg1vcd_muxer = {
- "vcd",
- "MPEG1 System format (VCD)",
- "video/mpeg",
- NULL,
- sizeof(MpegMuxContext),
- CODEC_ID_MP2,
- CODEC_ID_MPEG1VIDEO,
- mpeg_mux_init,
- mpeg_mux_write_packet,
- mpeg_mux_end,
-};
-#endif
-#ifdef CONFIG_MPEG2VOB_MUXER
-AVOutputFormat mpeg2vob_muxer = {
- "vob",
- "MPEG2 PS format (VOB)",
- "video/mpeg",
- "vob",
- sizeof(MpegMuxContext),
- CODEC_ID_MP2,
- CODEC_ID_MPEG2VIDEO,
- mpeg_mux_init,
- mpeg_mux_write_packet,
- mpeg_mux_end,
-};
-#endif
-
-/* Same as mpeg2vob_mux except that the pack size is 2324 */
-#ifdef CONFIG_MPEG2SVCD_MUXER
-AVOutputFormat mpeg2svcd_muxer = {
- "svcd",
- "MPEG2 PS format (VOB)",
- "video/mpeg",
- "vob",
- sizeof(MpegMuxContext),
- CODEC_ID_MP2,
- CODEC_ID_MPEG2VIDEO,
- mpeg_mux_init,
- mpeg_mux_write_packet,
- mpeg_mux_end,
-};
-#endif
-
-/* Same as mpeg2vob_mux except the 'is_dvd' flag is set to produce NAV pkts */
-#ifdef CONFIG_MPEG2DVD_MUXER
-AVOutputFormat mpeg2dvd_muxer = {
- "dvd",
- "MPEG2 PS format (DVD VOB)",
- "video/mpeg",
- "dvd",
- sizeof(MpegMuxContext),
- CODEC_ID_MP2,
- CODEC_ID_MPEG2VIDEO,
- mpeg_mux_init,
- mpeg_mux_write_packet,
- mpeg_mux_end,
-};
-#endif
-
-#ifdef CONFIG_MPEGPS_DEMUXER
-AVInputFormat mpegps_demuxer = {
- "mpeg",
- "MPEG PS format",
- sizeof(MpegDemuxContext),
- mpegps_probe,
- mpegps_read_header,
- mpegps_read_packet,
- mpegps_read_close,
- NULL, //mpegps_read_seek,
- mpegps_read_dts,
- .flags = AVFMT_SHOW_IDS,
-};
-#endif
+#endif /* AVFORMAT_MPEG_H */
Copied: trunk/libavformat/mpegenc.c (from r9381, /trunk/libavformat/mpeg.c)
==============================================================================
--- /trunk/libavformat/mpeg.c (original)
+++ trunk/libavformat/mpegenc.c Thu Jun 21 11:39:29 2007
@@ -1,5 +1,5 @@
/*
- * MPEG1/2 muxer and demuxer
+ * MPEG1/2 muxer
* Copyright (c) 2000, 2001, 2002 Fabrice Bellard.
*
* This file is part of FFmpeg.
@@ -18,9 +18,11 @@
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
+
#include "avformat.h"
#include "bitstream.h"
#include "fifo.h"
+#include "mpeg.h"
#define MAX_PAYLOAD_SIZE 4096
//#define DEBUG_SEEK
@@ -74,42 +76,6 @@ typedef struct {
} MpegMuxContext;
-#define PACK_START_CODE ((unsigned int)0x000001ba)
-#define SYSTEM_HEADER_START_CODE ((unsigned int)0x000001bb)
-#define SEQUENCE_END_CODE ((unsigned int)0x000001b7)
-#define PACKET_START_CODE_MASK ((unsigned int)0xffffff00)
-#define PACKET_START_CODE_PREFIX ((unsigned int)0x00000100)
-#define ISO_11172_END_CODE ((unsigned int)0x000001b9)
-
-/* mpeg2 */
-#define PROGRAM_STREAM_MAP 0x1bc
-#define PRIVATE_STREAM_1 0x1bd
-#define PADDING_STREAM 0x1be
-#define PRIVATE_STREAM_2 0x1bf
-
-
-#define AUDIO_ID 0xc0
-#define VIDEO_ID 0xe0
-#define AC3_ID 0x80
-#define DTS_ID 0x8a
-#define LPCM_ID 0xa0
-#define SUB_ID 0x20
-
-#define STREAM_TYPE_VIDEO_MPEG1 0x01
-#define STREAM_TYPE_VIDEO_MPEG2 0x02
-#define STREAM_TYPE_AUDIO_MPEG1 0x03
-#define STREAM_TYPE_AUDIO_MPEG2 0x04
-#define STREAM_TYPE_PRIVATE_SECTION 0x05
-#define STREAM_TYPE_PRIVATE_DATA 0x06
-#define STREAM_TYPE_AUDIO_AAC 0x0f
-#define STREAM_TYPE_VIDEO_MPEG4 0x10
-#define STREAM_TYPE_VIDEO_H264 0x1b
-
-#define STREAM_TYPE_AUDIO_AC3 0x81
-#define STREAM_TYPE_AUDIO_DTS 0x8a
-
-static const int lpcm_freq_tab[4] = { 48000, 96000, 44100, 32000 };
-
#ifdef CONFIG_MUXERS
AVOutputFormat mpeg1system_muxer;
AVOutputFormat mpeg1vcd_muxer;
@@ -1255,514 +1221,6 @@ static int mpeg_mux_end(AVFormatContext
}
#endif //CONFIG_MUXERS
-/*********************************************/
-/* demux code */
-
-#define MAX_SYNC_SIZE 100000
-
-static int cdxa_probe(AVProbeData *p)
-{
- /* check file header */
- if (p->buf[0] == 'R' && p->buf[1] == 'I' &&
- p->buf[2] == 'F' && p->buf[3] == 'F' &&
- p->buf[8] == 'C' && p->buf[9] == 'D' &&
- p->buf[10] == 'X' && p->buf[11] == 'A')
- return AVPROBE_SCORE_MAX;
- else
- return 0;
-}
-
-static int mpegps_probe(AVProbeData *p)
-{
- uint32_t code= -1;
- int sys=0, pspack=0, priv1=0, vid=0, audio=0;
- int i;
- int score=0;
-
- score = cdxa_probe(p);
- if (score > 0) return score;
-
- /* Search for MPEG stream */
- for(i=0; i<p->buf_size; i++){
- code = (code<<8) + p->buf[i];
- if ((code & 0xffffff00) == 0x100) {
- if(code == SYSTEM_HEADER_START_CODE) sys++;
- else if(code == PRIVATE_STREAM_1) priv1++;
- else if(code == PACK_START_CODE) pspack++;
- else if((code & 0xf0) == VIDEO_ID) vid++;
- else if((code & 0xe0) == AUDIO_ID) audio++;
- }
- }
-
- if(vid || audio) /* invalid VDR files nd short PES streams */
- score= AVPROBE_SCORE_MAX/4;
-
-//av_log(NULL, AV_LOG_ERROR, "%d %d %d %d %d\n", sys, priv1, pspack,vid, audio);
- if(sys && sys*9 <= pspack*10)
- return AVPROBE_SCORE_MAX/2+2; // +1 for .mpg
- if((priv1 || vid || audio) && (priv1+vid+audio)*9 <= pspack*10)
- return AVPROBE_SCORE_MAX/2+2; // +1 for .mpg
- if((!!vid ^ !!audio) && (audio+vid > 1) && !sys && !pspack) /* PES stream */
- return AVPROBE_SCORE_MAX/2+2;
-
- //02-Penguin.flac has sys:0 priv1:0 pspack:0 vid:0 audio:1
- return score;
-}
-
-
-typedef struct MpegDemuxContext {
- int32_t header_state;
- unsigned char psm_es_type[256];
-} MpegDemuxContext;
-
-static int mpegps_read_header(AVFormatContext *s,
- AVFormatParameters *ap)
-{
- MpegDemuxContext *m = s->priv_data;
- m->header_state = 0xff;
- s->ctx_flags |= AVFMTCTX_NOHEADER;
-
- /* no need to do more */
- return 0;
-}
-
-static int64_t get_pts(ByteIOContext *pb, int c)
-{
- int64_t pts;
- int val;
-
- if (c < 0)
- c = get_byte(pb);
- pts = (int64_t)((c >> 1) & 0x07) << 30;
- val = get_be16(pb);
- pts |= (int64_t)(val >> 1) << 15;
- val = get_be16(pb);
- pts |= (int64_t)(val >> 1);
- return pts;
-}
-
-static int find_next_start_code(ByteIOContext *pb, int *size_ptr,
- int32_t *header_state)
-{
- unsigned int state, v;
- int val, n;
-
- state = *header_state;
- n = *size_ptr;
- while (n > 0) {
- if (url_feof(pb))
- break;
- v = get_byte(pb);
- n--;
- if (state == 0x000001) {
- state = ((state << 8) | v) & 0xffffff;
- val = state;
- goto found;
- }
- state = ((state << 8) | v) & 0xffffff;
- }
- val = -1;
- found:
- *header_state = state;
- *size_ptr = n;
- return val;
-}
-
-#if 0 /* unused, remove? */
-/* XXX: optimize */
-static int find_prev_start_code(ByteIOContext *pb, int *size_ptr)
-{
- int64_t pos, pos_start;
- int max_size, start_code;
-
- max_size = *size_ptr;
- pos_start = url_ftell(pb);
-
- /* in order to go faster, we fill the buffer */
- pos = pos_start - 16386;
- if (pos < 0)
- pos = 0;
- url_fseek(pb, pos, SEEK_SET);
- get_byte(pb);
-
- pos = pos_start;
- for(;;) {
- pos--;
- if (pos < 0 || (pos_start - pos) >= max_size) {
- start_code = -1;
- goto the_end;
- }
- url_fseek(pb, pos, SEEK_SET);
- start_code = get_be32(pb);
- if ((start_code & 0xffffff00) == 0x100)
- break;
- }
- the_end:
- *size_ptr = pos_start - pos;
- return start_code;
-}
-#endif
-
-/**
- * Extracts stream types from a program stream map
- * According to ISO/IEC 13818-1 ('MPEG-2 Systems') table 2-35
- *
- * @return number of bytes occupied by PSM in the bitstream
- */
-static long mpegps_psm_parse(MpegDemuxContext *m, ByteIOContext *pb)
-{
- int psm_length, ps_info_length, es_map_length;
-
- psm_length = get_be16(pb);
- get_byte(pb);
- get_byte(pb);
- ps_info_length = get_be16(pb);
-
- /* skip program_stream_info */
- url_fskip(pb, ps_info_length);
- es_map_length = get_be16(pb);
-
- /* at least one es available? */
- while (es_map_length >= 4){
- unsigned char type = get_byte(pb);
- unsigned char es_id = get_byte(pb);
- uint16_t es_info_length = get_be16(pb);
- /* remember mapping from stream id to stream type */
- m->psm_es_type[es_id] = type;
- /* skip program_stream_info */
- url_fskip(pb, es_info_length);
- es_map_length -= 4 + es_info_length;
- }
- get_be32(pb); /* crc32 */
- return 2 + psm_length;
-}
-
-/* read the next PES header. Return its position in ppos
- (if not NULL), and its start code, pts and dts.
- */
-static int mpegps_read_pes_header(AVFormatContext *s,
- int64_t *ppos, int *pstart_code,
- int64_t *ppts, int64_t *pdts)
-{
- MpegDemuxContext *m = s->priv_data;
- int len, size, startcode, c, flags, header_len;
- int pes_ext, ext2_len, id_ext, skip;
- int64_t pts, dts;
- int64_t last_sync= url_ftell(&s->pb);
-
- error_redo:
- url_fseek(&s->pb, last_sync, SEEK_SET);
- redo:
- /* next start code (should be immediately after) */
- m->header_state = 0xff;
- size = MAX_SYNC_SIZE;
- startcode = find_next_start_code(&s->pb, &size, &m->header_state);
- last_sync = url_ftell(&s->pb);
- //printf("startcode=%x pos=0x%"PRIx64"\n", startcode, url_ftell(&s->pb));
- if (startcode < 0)
- return AVERROR_IO;
- if (startcode == PACK_START_CODE)
- goto redo;
- if (startcode == SYSTEM_HEADER_START_CODE)
- goto redo;
- if (startcode == PADDING_STREAM ||
- startcode == PRIVATE_STREAM_2) {
- /* skip them */
- len = get_be16(&s->pb);
- url_fskip(&s->pb, len);
- goto redo;
- }
- if (startcode == PROGRAM_STREAM_MAP) {
- mpegps_psm_parse(m, &s->pb);
- goto redo;
- }
-
- /* find matching stream */
- if (!((startcode >= 0x1c0 && startcode <= 0x1df) ||
- (startcode >= 0x1e0 && startcode <= 0x1ef) ||
- (startcode == 0x1bd) || (startcode == 0x1fd)))
- goto redo;
- if (ppos) {
- *ppos = url_ftell(&s->pb) - 4;
- }
- len = get_be16(&s->pb);
- pts =
- dts = AV_NOPTS_VALUE;
- /* stuffing */
- for(;;) {
- if (len < 1)
- goto error_redo;
- c = get_byte(&s->pb);
- len--;
- /* XXX: for mpeg1, should test only bit 7 */
- if (c != 0xff)
- break;
- }
- if ((c & 0xc0) == 0x40) {
- /* buffer scale & size */
- get_byte(&s->pb);
- c = get_byte(&s->pb);
- len -= 2;
- }
- if ((c & 0xe0) == 0x20) {
- dts = pts = get_pts(&s->pb, c);
- len -= 4;
- if (c & 0x10){
- dts = get_pts(&s->pb, -1);
- len -= 5;
- }
- } else if ((c & 0xc0) == 0x80) {
- /* mpeg 2 PES */
-#if 0 /* some streams have this field set for no apparent reason */
- if ((c & 0x30) != 0) {
- /* Encrypted multiplex not handled */
- goto redo;
- }
-#endif
- flags = get_byte(&s->pb);
- header_len = get_byte(&s->pb);
- len -= 2;
- if (header_len > len)
- goto error_redo;
- len -= header_len;
- if (flags & 0x80) {
- dts = pts = get_pts(&s->pb, -1);
- header_len -= 5;
- if (flags & 0x40) {
- dts = get_pts(&s->pb, -1);
- header_len -= 5;
- }
- }
- if (flags & 0x01) { /* PES extension */
- pes_ext = get_byte(&s->pb);
- header_len--;
- if (pes_ext & 0x40) { /* pack header - should be zero in PS */
- goto error_redo;
- }
- /* Skip PES private data, program packet sequence counter and P-STD buffer */
- skip = (pes_ext >> 4) & 0xb;
- skip += skip & 0x9;
- url_fskip(&s->pb, skip);
- header_len -= skip;
-
- if (pes_ext & 0x01) { /* PES extension 2 */
- ext2_len = get_byte(&s->pb);
- header_len--;
- if ((ext2_len & 0x7f) > 0) {
- id_ext = get_byte(&s->pb);
- if ((id_ext & 0x80) == 0)
- startcode = ((startcode & 0xff) << 8) | id_ext;
- header_len--;
- }
- }
- }
- if(header_len < 0)
- goto error_redo;
- url_fskip(&s->pb, header_len);
- }
- else if( c!= 0xf )
- goto redo;
-
- if (startcode == PRIVATE_STREAM_1 && !m->psm_es_type[startcode & 0xff]) {
- startcode = get_byte(&s->pb);
- len--;
- if (startcode >= 0x80 && startcode <= 0xcf) {
- /* audio: skip header */
- get_byte(&s->pb);
- get_byte(&s->pb);
- get_byte(&s->pb);
- len -= 3;
- if (startcode >= 0xb0 && startcode <= 0xbf) {
- /* MLP/TrueHD audio has a 4-byte header */
- get_byte(&s->pb);
- len--;
- }
- }
- }
- if(len<0)
- goto error_redo;
- if(dts != AV_NOPTS_VALUE && ppos){
- int i;
- for(i=0; i<s->nb_streams; i++){
- if(startcode == s->streams[i]->id) {
- av_add_index_entry(s->streams[i], *ppos, dts, 0, 0, AVINDEX_KEYFRAME /* FIXME keyframe? */);
- }
- }
- }
-
- *pstart_code = startcode;
- *ppts = pts;
- *pdts = dts;
- return len;
-}
-
-static int mpegps_read_packet(AVFormatContext *s,
- AVPacket *pkt)
-{
- MpegDemuxContext *m = s->priv_data;
- AVStream *st;
- int len, startcode, i, type, codec_id = 0, es_type;
- int64_t pts, dts, dummy_pos; //dummy_pos is needed for the index building to work
-
- redo:
- len = mpegps_read_pes_header(s, &dummy_pos, &startcode, &pts, &dts);
- if (len < 0)
- return len;
-
- /* now find stream */
- for(i=0;i<s->nb_streams;i++) {
- st = s->streams[i];
- if (st->id == startcode)
- goto found;
- }
-
- es_type = m->psm_es_type[startcode & 0xff];
- if(es_type > 0){
- if(es_type == STREAM_TYPE_VIDEO_MPEG1){
- codec_id = CODEC_ID_MPEG2VIDEO;
- type = CODEC_TYPE_VIDEO;
- } else if(es_type == STREAM_TYPE_VIDEO_MPEG2){
- codec_id = CODEC_ID_MPEG2VIDEO;
- type = CODEC_TYPE_VIDEO;
- } else if(es_type == STREAM_TYPE_AUDIO_MPEG1 ||
- es_type == STREAM_TYPE_AUDIO_MPEG2){
- codec_id = CODEC_ID_MP3;
- type = CODEC_TYPE_AUDIO;
- } else if(es_type == STREAM_TYPE_AUDIO_AAC){
- codec_id = CODEC_ID_AAC;
- type = CODEC_TYPE_AUDIO;
- } else if(es_type == STREAM_TYPE_VIDEO_MPEG4){
- codec_id = CODEC_ID_MPEG4;
- type = CODEC_TYPE_VIDEO;
- } else if(es_type == STREAM_TYPE_VIDEO_H264){
- codec_id = CODEC_ID_H264;
- type = CODEC_TYPE_VIDEO;
- } else if(es_type == STREAM_TYPE_AUDIO_AC3){
- codec_id = CODEC_ID_AC3;
- type = CODEC_TYPE_AUDIO;
- } else {
- goto skip;
- }
- } else if (startcode >= 0x1e0 && startcode <= 0x1ef) {
- static const unsigned char avs_seqh[4] = { 0, 0, 1, 0xb0 };
- unsigned char buf[8];
- get_buffer(&s->pb, buf, 8);
- url_fseek(&s->pb, -8, SEEK_CUR);
- if(!memcmp(buf, avs_seqh, 4) && (buf[6] != 0 || buf[7] != 1))
- codec_id = CODEC_ID_CAVS;
- else
- codec_id = CODEC_ID_MPEG2VIDEO;
- type = CODEC_TYPE_VIDEO;
- } else if (startcode >= 0x1c0 && startcode <= 0x1df) {
- type = CODEC_TYPE_AUDIO;
- codec_id = CODEC_ID_MP2;
- } else if (startcode >= 0x80 && startcode <= 0x87) {
- type = CODEC_TYPE_AUDIO;
- codec_id = CODEC_ID_AC3;
- } else if ((startcode >= 0x88 && startcode <= 0x8f)
- ||( startcode >= 0x98 && startcode <= 0x9f)) {
- /* 0x90 - 0x97 is reserved for SDDS in DVD specs */
- type = CODEC_TYPE_AUDIO;
- codec_id = CODEC_ID_DTS;
- } else if (startcode >= 0xa0 && startcode <= 0xaf) {
- type = CODEC_TYPE_AUDIO;
- codec_id = CODEC_ID_PCM_S16BE;
- } else if (startcode >= 0xb0 && startcode <= 0xbf) {
- type = CODEC_TYPE_AUDIO;
- codec_id = CODEC_ID_MLP;
- } else if (startcode >= 0xc0 && startcode <= 0xcf) {
- /* Used for both AC-3 and E-AC-3 in EVOB files */
- type = CODEC_TYPE_AUDIO;
- codec_id = CODEC_ID_AC3;
- } else if (startcode >= 0x20 && startcode <= 0x3f) {
- type = CODEC_TYPE_SUBTITLE;
- codec_id = CODEC_ID_DVD_SUBTITLE;
- } else if (startcode >= 0xfd55 && startcode <= 0xfd5f) {
- type = CODEC_TYPE_VIDEO;
- codec_id = CODEC_ID_VC1;
- } else {
- skip:
- /* skip packet */
- url_fskip(&s->pb, len);
- goto redo;
- }
- /* no stream found: add a new stream */
- st = av_new_stream(s, startcode);
- if (!st)
- goto skip;
- st->codec->codec_type = type;
- st->codec->codec_id = codec_id;
- if (codec_id != CODEC_ID_PCM_S16BE)
- st->need_parsing = AVSTREAM_PARSE_FULL;
- found:
- if(st->discard >= AVDISCARD_ALL)
- goto skip;
- if (startcode >= 0xa0 && startcode <= 0xaf) {
- int b1, freq;
-
- /* for LPCM, we just skip the header and consider it is raw
- audio data */
- if (len <= 3)
- goto skip;
- get_byte(&s->pb); /* emphasis (1), muse(1), reserved(1), frame number(5) */
- b1 = get_byte(&s->pb); /* quant (2), freq(2), reserved(1), channels(3) */
- get_byte(&s->pb); /* dynamic range control (0x80 = off) */
- len -= 3;
- freq = (b1 >> 4) & 3;
- st->codec->sample_rate = lpcm_freq_tab[freq];
- st->codec->channels = 1 + (b1 & 7);
- st->codec->bit_rate = st->codec->channels * st->codec->sample_rate * 2;
- }
- av_new_packet(pkt, len);
- get_buffer(&s->pb, pkt->data, pkt->size);
- pkt->pts = pts;
- pkt->dts = dts;
- pkt->stream_index = st->index;
-#if 0
- av_log(s, AV_LOG_DEBUG, "%d: pts=%0.3f dts=%0.3f size=%d\n",
- pkt->stream_index, pkt->pts / 90000.0, pkt->dts / 90000.0, pkt->size);
-#endif
-
- return 0;
-}
-
-static int mpegps_read_close(AVFormatContext *s)
-{
- return 0;
-}
-
-static int64_t mpegps_read_dts(AVFormatContext *s, int stream_index,
- int64_t *ppos, int64_t pos_limit)
-{
- int len, startcode;
- int64_t pos, pts, dts;
-
- pos = *ppos;
-#ifdef DEBUG_SEEK
- printf("read_dts: pos=0x%"PRIx64" next=%d -> ", pos, find_next);
-#endif
- url_fseek(&s->pb, pos, SEEK_SET);
- for(;;) {
- len = mpegps_read_pes_header(s, &pos, &startcode, &pts, &dts);
- if (len < 0) {
-#ifdef DEBUG_SEEK
- printf("none (ret=%d)\n", len);
-#endif
- return AV_NOPTS_VALUE;
- }
- if (startcode == s->streams[stream_index]->id &&
- dts != AV_NOPTS_VALUE) {
- break;
- }
- url_fskip(&s->pb, len);
- }
-#ifdef DEBUG_SEEK
- printf("pos=0x%"PRIx64" dts=0x%"PRIx64" %0.3f\n", pos, dts, dts / 90000.0);
-#endif
- *ppos = pos;
- return dts;
-}
-
#ifdef CONFIG_MPEG1SYSTEM_MUXER
AVOutputFormat mpeg1system_muxer = {
"mpeg",
@@ -1837,18 +1295,3 @@ AVOutputFormat mpeg2dvd_muxer = {
mpeg_mux_end,
};
#endif
-
-#ifdef CONFIG_MPEGPS_DEMUXER
-AVInputFormat mpegps_demuxer = {
- "mpeg",
- "MPEG PS format",
- sizeof(MpegDemuxContext),
- mpegps_probe,
- mpegps_read_header,
- mpegps_read_packet,
- mpegps_read_close,
- NULL, //mpegps_read_seek,
- mpegps_read_dts,
- .flags = AVFMT_SHOW_IDS,
-};
-#endif
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