[FFmpeg-cvslog] dv: Split off DV video decoder into its own file.
Diego Biurrun
git at videolan.org
Wed Mar 28 04:26:28 CEST 2012
ffmpeg | branch: master | Diego Biurrun <diego at biurrun.de> | Sun Mar 18 19:01:45 2012 +0100| [d724fe665bf8a9bddb2d9f87713036aa786c4dac] | committer: Diego Biurrun
dv: Split off DV video decoder into its own file.
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=d724fe665bf8a9bddb2d9f87713036aa786c4dac
---
libavcodec/Makefile | 2 +-
libavcodec/dv.c | 403 +---------------------------------------------
libavcodec/dv_tablegen.h | 4 +-
libavcodec/dvdata.h | 44 +++++
libavcodec/dvdec.c | 386 ++++++++++++++++++++++++++++++++++++++++++++
5 files changed, 442 insertions(+), 397 deletions(-)
diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index e4e5294..4dc218a 100644
--- a/libavcodec/Makefile
+++ b/libavcodec/Makefile
@@ -126,7 +126,7 @@ OBJS-$(CONFIG_DVBSUB_DECODER) += dvbsubdec.o
OBJS-$(CONFIG_DVBSUB_ENCODER) += dvbsub.o
OBJS-$(CONFIG_DVDSUB_DECODER) += dvdsubdec.o
OBJS-$(CONFIG_DVDSUB_ENCODER) += dvdsubenc.o
-OBJS-$(CONFIG_DVVIDEO_DECODER) += dv.o dvdata.o
+OBJS-$(CONFIG_DVVIDEO_DECODER) += dvdec.o dv.o dvdata.o
OBJS-$(CONFIG_DVVIDEO_ENCODER) += dv.o dvdata.o
OBJS-$(CONFIG_DXA_DECODER) += dxa.o
OBJS-$(CONFIG_DXTORY_DECODER) += dxtory.o
diff --git a/libavcodec/dv.c b/libavcodec/dv.c
index 3deaa5e..aba94eb 100644
--- a/libavcodec/dv.c
+++ b/libavcodec/dv.c
@@ -49,37 +49,8 @@
#include "dvquant.h"
#include "dv_tablegen.h"
-//#undef NDEBUG
-//#include <assert.h>
-
-typedef struct DVVideoContext {
- const DVprofile *sys;
- AVFrame picture;
- AVCodecContext *avctx;
- uint8_t *buf;
-
- uint8_t dv_zigzag[2][64];
-
- void (*get_pixels)(DCTELEM *block, const uint8_t *pixels, int line_size);
- void (*fdct[2])(DCTELEM *block);
- void (*idct_put[2])(uint8_t *dest, int line_size, DCTELEM *block);
- me_cmp_func ildct_cmp;
-} DVVideoContext;
-
-#define TEX_VLC_BITS 9
-
/* XXX: also include quantization */
-static RL_VLC_ELEM dv_rl_vlc[1184];
-
-static inline int dv_work_pool_size(const DVprofile *d)
-{
- int size = d->n_difchan*d->difseg_size*27;
- if (DV_PROFILE_IS_1080i50(d))
- size -= 3*27;
- if (DV_PROFILE_IS_720p50(d))
- size -= 4*27;
- return size;
-}
+RL_VLC_ELEM ff_dv_rl_vlc[1184];
static inline void dv_calc_mb_coordinates(const DVprofile *d, int chan, int seq, int slot,
uint16_t *tbl)
@@ -196,7 +167,7 @@ static inline void dv_calc_mb_coordinates(const DVprofile *d, int chan, int seq,
}
}
-static int dv_init_dynamic_tables(const DVprofile *d)
+int ff_dv_init_dynamic_tables(const DVprofile *d)
{
int j,i,c,s,p;
uint32_t *factor1, *factor2;
@@ -257,7 +228,7 @@ static int dv_init_dynamic_tables(const DVprofile *d)
return 0;
}
-static av_cold int dvvideo_init(AVCodecContext *avctx)
+av_cold int ff_dvvideo_init(AVCodecContext *avctx)
{
DVVideoContext *s = avctx->priv_data;
DSPContext dsp;
@@ -310,9 +281,9 @@ static av_cold int dvvideo_init(AVCodecContext *avctx)
run = new_dv_vlc_run [code] + 1;
level = new_dv_vlc_level[code];
}
- dv_rl_vlc[i].len = len;
- dv_rl_vlc[i].level = level;
- dv_rl_vlc[i].run = run;
+ ff_dv_rl_vlc[i].len = len;
+ ff_dv_rl_vlc[i].level = level;
+ ff_dv_rl_vlc[i].run = run;
}
ff_free_vlc(&dv_vlc);
@@ -357,19 +328,9 @@ static av_cold int dvvideo_init_encoder(AVCodecContext *avctx)
return -1;
}
- return dvvideo_init(avctx);
+ return ff_dvvideo_init(avctx);
}
-typedef struct BlockInfo {
- const uint32_t *factor_table;
- const uint8_t *scan_table;
- uint8_t pos; /* position in block */
- void (*idct_put)(uint8_t *dest, int line_size, DCTELEM *block);
- uint8_t partial_bit_count;
- uint32_t partial_bit_buffer;
- int shift_offset;
-} BlockInfo;
-
/* bit budget for AC only in 5 MBs */
static const int vs_total_ac_bits = (100 * 4 + 68*2) * 5;
static const int mb_area_start[5] = { 1, 6, 21, 43, 64 };
@@ -379,268 +340,6 @@ static inline int put_bits_left(PutBitContext* s)
return (s->buf_end - s->buf) * 8 - put_bits_count(s);
}
-/* decode AC coefficients */
-static void dv_decode_ac(GetBitContext *gb, BlockInfo *mb, DCTELEM *block)
-{
- int last_index = gb->size_in_bits;
- const uint8_t *scan_table = mb->scan_table;
- const uint32_t *factor_table = mb->factor_table;
- int pos = mb->pos;
- int partial_bit_count = mb->partial_bit_count;
- int level, run, vlc_len, index;
-
- OPEN_READER(re, gb);
- UPDATE_CACHE(re, gb);
-
- /* if we must parse a partial VLC, we do it here */
- if (partial_bit_count > 0) {
- re_cache = re_cache >> partial_bit_count | mb->partial_bit_buffer;
- re_index -= partial_bit_count;
- mb->partial_bit_count = 0;
- }
-
- /* get the AC coefficients until last_index is reached */
- for (;;) {
- av_dlog(NULL, "%2d: bits=%04x index=%d\n", pos, SHOW_UBITS(re, gb, 16),
- re_index);
- /* our own optimized GET_RL_VLC */
- index = NEG_USR32(re_cache, TEX_VLC_BITS);
- vlc_len = dv_rl_vlc[index].len;
- if (vlc_len < 0) {
- index = NEG_USR32((unsigned)re_cache << TEX_VLC_BITS, -vlc_len) + dv_rl_vlc[index].level;
- vlc_len = TEX_VLC_BITS - vlc_len;
- }
- level = dv_rl_vlc[index].level;
- run = dv_rl_vlc[index].run;
-
- /* gotta check if we're still within gb boundaries */
- if (re_index + vlc_len > last_index) {
- /* should be < 16 bits otherwise a codeword could have been parsed */
- mb->partial_bit_count = last_index - re_index;
- mb->partial_bit_buffer = re_cache & ~(-1u >> mb->partial_bit_count);
- re_index = last_index;
- break;
- }
- re_index += vlc_len;
-
- av_dlog(NULL, "run=%d level=%d\n", run, level);
- pos += run;
- if (pos >= 64)
- break;
-
- level = (level * factor_table[pos] + (1 << (dv_iweight_bits - 1))) >> dv_iweight_bits;
- block[scan_table[pos]] = level;
-
- UPDATE_CACHE(re, gb);
- }
- CLOSE_READER(re, gb);
- mb->pos = pos;
-}
-
-static inline void bit_copy(PutBitContext *pb, GetBitContext *gb)
-{
- int bits_left = get_bits_left(gb);
- while (bits_left >= MIN_CACHE_BITS) {
- put_bits(pb, MIN_CACHE_BITS, get_bits(gb, MIN_CACHE_BITS));
- bits_left -= MIN_CACHE_BITS;
- }
- if (bits_left > 0) {
- put_bits(pb, bits_left, get_bits(gb, bits_left));
- }
-}
-
-static inline void dv_calculate_mb_xy(DVVideoContext *s, DVwork_chunk *work_chunk, int m, int *mb_x, int *mb_y)
-{
- *mb_x = work_chunk->mb_coordinates[m] & 0xff;
- *mb_y = work_chunk->mb_coordinates[m] >> 8;
-
- /* We work with 720p frames split in half. The odd half-frame (chan==2,3) is displaced :-( */
- if (s->sys->height == 720 && !(s->buf[1]&0x0C)) {
- *mb_y -= (*mb_y>17)?18:-72; /* shifting the Y coordinate down by 72/2 macro blocks */
- }
-}
-
-/* mb_x and mb_y are in units of 8 pixels */
-static int dv_decode_video_segment(AVCodecContext *avctx, void *arg)
-{
- DVVideoContext *s = avctx->priv_data;
- DVwork_chunk *work_chunk = arg;
- int quant, dc, dct_mode, class1, j;
- int mb_index, mb_x, mb_y, last_index;
- int y_stride, linesize;
- DCTELEM *block, *block1;
- int c_offset;
- uint8_t *y_ptr;
- const uint8_t *buf_ptr;
- PutBitContext pb, vs_pb;
- GetBitContext gb;
- BlockInfo mb_data[5 * DV_MAX_BPM], *mb, *mb1;
- LOCAL_ALIGNED_16(DCTELEM, sblock, [5*DV_MAX_BPM], [64]);
- LOCAL_ALIGNED_16(uint8_t, mb_bit_buffer, [ 80 + FF_INPUT_BUFFER_PADDING_SIZE]); /* allow some slack */
- LOCAL_ALIGNED_16(uint8_t, vs_bit_buffer, [5*80 + FF_INPUT_BUFFER_PADDING_SIZE]); /* allow some slack */
- const int log2_blocksize = 3-s->avctx->lowres;
- int is_field_mode[5];
-
- assert((((int)mb_bit_buffer) & 7) == 0);
- assert((((int)vs_bit_buffer) & 7) == 0);
-
- memset(sblock, 0, 5*DV_MAX_BPM*sizeof(*sblock));
-
- /* pass 1: read DC and AC coefficients in blocks */
- buf_ptr = &s->buf[work_chunk->buf_offset*80];
- block1 = &sblock[0][0];
- mb1 = mb_data;
- init_put_bits(&vs_pb, vs_bit_buffer, 5 * 80);
- for (mb_index = 0; mb_index < 5; mb_index++, mb1 += s->sys->bpm, block1 += s->sys->bpm * 64) {
- /* skip header */
- quant = buf_ptr[3] & 0x0f;
- buf_ptr += 4;
- init_put_bits(&pb, mb_bit_buffer, 80);
- mb = mb1;
- block = block1;
- is_field_mode[mb_index] = 0;
- for (j = 0; j < s->sys->bpm; j++) {
- last_index = s->sys->block_sizes[j];
- init_get_bits(&gb, buf_ptr, last_index);
-
- /* get the DC */
- dc = get_sbits(&gb, 9);
- dct_mode = get_bits1(&gb);
- class1 = get_bits(&gb, 2);
- if (DV_PROFILE_IS_HD(s->sys)) {
- mb->idct_put = s->idct_put[0];
- mb->scan_table = s->dv_zigzag[0];
- mb->factor_table = &s->sys->idct_factor[(j >= 4)*4*16*64 + class1*16*64 + quant*64];
- is_field_mode[mb_index] |= !j && dct_mode;
- } else {
- mb->idct_put = s->idct_put[dct_mode && log2_blocksize == 3];
- mb->scan_table = s->dv_zigzag[dct_mode];
- mb->factor_table = &s->sys->idct_factor[(class1 == 3)*2*22*64 + dct_mode*22*64 +
- (quant + dv_quant_offset[class1])*64];
- }
- dc = dc << 2;
- /* convert to unsigned because 128 is not added in the
- standard IDCT */
- dc += 1024;
- block[0] = dc;
- buf_ptr += last_index >> 3;
- mb->pos = 0;
- mb->partial_bit_count = 0;
-
- av_dlog(avctx, "MB block: %d, %d ", mb_index, j);
- dv_decode_ac(&gb, mb, block);
-
- /* write the remaining bits in a new buffer only if the
- block is finished */
- if (mb->pos >= 64)
- bit_copy(&pb, &gb);
-
- block += 64;
- mb++;
- }
-
- /* pass 2: we can do it just after */
- av_dlog(avctx, "***pass 2 size=%d MB#=%d\n", put_bits_count(&pb), mb_index);
- block = block1;
- mb = mb1;
- init_get_bits(&gb, mb_bit_buffer, put_bits_count(&pb));
- put_bits32(&pb, 0); // padding must be zeroed
- flush_put_bits(&pb);
- for (j = 0; j < s->sys->bpm; j++, block += 64, mb++) {
- if (mb->pos < 64 && get_bits_left(&gb) > 0) {
- dv_decode_ac(&gb, mb, block);
- /* if still not finished, no need to parse other blocks */
- if (mb->pos < 64)
- break;
- }
- }
- /* all blocks are finished, so the extra bytes can be used at
- the video segment level */
- if (j >= s->sys->bpm)
- bit_copy(&vs_pb, &gb);
- }
-
- /* we need a pass over the whole video segment */
- av_dlog(avctx, "***pass 3 size=%d\n", put_bits_count(&vs_pb));
- block = &sblock[0][0];
- mb = mb_data;
- init_get_bits(&gb, vs_bit_buffer, put_bits_count(&vs_pb));
- put_bits32(&vs_pb, 0); // padding must be zeroed
- flush_put_bits(&vs_pb);
- for (mb_index = 0; mb_index < 5; mb_index++) {
- for (j = 0; j < s->sys->bpm; j++) {
- if (mb->pos < 64) {
- av_dlog(avctx, "start %d:%d\n", mb_index, j);
- dv_decode_ac(&gb, mb, block);
- }
- if (mb->pos >= 64 && mb->pos < 127)
- av_log(avctx, AV_LOG_ERROR, "AC EOB marker is absent pos=%d\n", mb->pos);
- block += 64;
- mb++;
- }
- }
-
- /* compute idct and place blocks */
- block = &sblock[0][0];
- mb = mb_data;
- for (mb_index = 0; mb_index < 5; mb_index++) {
- dv_calculate_mb_xy(s, work_chunk, mb_index, &mb_x, &mb_y);
-
- /* idct_put'ting luminance */
- if ((s->sys->pix_fmt == PIX_FMT_YUV420P) ||
- (s->sys->pix_fmt == PIX_FMT_YUV411P && mb_x >= (704 / 8)) ||
- (s->sys->height >= 720 && mb_y != 134)) {
- y_stride = (s->picture.linesize[0] << ((!is_field_mode[mb_index]) * log2_blocksize));
- } else {
- y_stride = (2 << log2_blocksize);
- }
- y_ptr = s->picture.data[0] + ((mb_y * s->picture.linesize[0] + mb_x) << log2_blocksize);
- linesize = s->picture.linesize[0] << is_field_mode[mb_index];
- mb[0] .idct_put(y_ptr , linesize, block + 0*64);
- if (s->sys->video_stype == 4) { /* SD 422 */
- mb[2].idct_put(y_ptr + (1 << log2_blocksize) , linesize, block + 2*64);
- } else {
- mb[1].idct_put(y_ptr + (1 << log2_blocksize) , linesize, block + 1*64);
- mb[2].idct_put(y_ptr + y_stride, linesize, block + 2*64);
- mb[3].idct_put(y_ptr + (1 << log2_blocksize) + y_stride, linesize, block + 3*64);
- }
- mb += 4;
- block += 4*64;
-
- /* idct_put'ting chrominance */
- c_offset = (((mb_y >> (s->sys->pix_fmt == PIX_FMT_YUV420P)) * s->picture.linesize[1] +
- (mb_x >> ((s->sys->pix_fmt == PIX_FMT_YUV411P) ? 2 : 1))) << log2_blocksize);
- for (j = 2; j; j--) {
- uint8_t *c_ptr = s->picture.data[j] + c_offset;
- if (s->sys->pix_fmt == PIX_FMT_YUV411P && mb_x >= (704 / 8)) {
- uint64_t aligned_pixels[64/8];
- uint8_t *pixels = (uint8_t*)aligned_pixels;
- uint8_t *c_ptr1, *ptr1;
- int x, y;
- mb->idct_put(pixels, 8, block);
- for (y = 0; y < (1 << log2_blocksize); y++, c_ptr += s->picture.linesize[j], pixels += 8) {
- ptr1 = pixels + (1 << (log2_blocksize - 1));
- c_ptr1 = c_ptr + (s->picture.linesize[j] << log2_blocksize);
- for (x = 0; x < (1 << (log2_blocksize - 1)); x++) {
- c_ptr[x] = pixels[x];
- c_ptr1[x] = ptr1[x];
- }
- }
- block += 64; mb++;
- } else {
- y_stride = (mb_y == 134) ? (1 << log2_blocksize) :
- s->picture.linesize[j] << ((!is_field_mode[mb_index]) * log2_blocksize);
- linesize = s->picture.linesize[j] << is_field_mode[mb_index];
- (mb++)-> idct_put(c_ptr , linesize, block); block += 64;
- if (s->sys->bpm == 8) {
- (mb++)->idct_put(c_ptr + y_stride, linesize, block); block += 64;
- }
- }
- }
- }
- return 0;
-}
-
#if CONFIG_SMALL
/* Converts run and level (where level != 0) pair into VLC, returning bit size */
static av_always_inline int dv_rl2vlc(int run, int level, int sign, uint32_t* vlc)
@@ -1060,64 +759,6 @@ static int dv_encode_video_segment(AVCodecContext *avctx, void *arg)
return 0;
}
-#if CONFIG_DVVIDEO_DECODER
-/* NOTE: exactly one frame must be given (120000 bytes for NTSC,
- 144000 bytes for PAL - or twice those for 50Mbps) */
-static int dvvideo_decode_frame(AVCodecContext *avctx,
- void *data, int *data_size,
- AVPacket *avpkt)
-{
- const uint8_t *buf = avpkt->data;
- int buf_size = avpkt->size;
- DVVideoContext *s = avctx->priv_data;
- const uint8_t* vsc_pack;
- int apt, is16_9;
-
- s->sys = avpriv_dv_frame_profile(s->sys, buf, buf_size);
- if (!s->sys || buf_size < s->sys->frame_size || dv_init_dynamic_tables(s->sys)) {
- av_log(avctx, AV_LOG_ERROR, "could not find dv frame profile\n");
- return -1; /* NOTE: we only accept several full frames */
- }
-
- if (s->picture.data[0])
- avctx->release_buffer(avctx, &s->picture);
-
- s->picture.reference = 0;
- s->picture.key_frame = 1;
- s->picture.pict_type = AV_PICTURE_TYPE_I;
- avctx->pix_fmt = s->sys->pix_fmt;
- avctx->time_base = s->sys->time_base;
- avcodec_set_dimensions(avctx, s->sys->width, s->sys->height);
- if (avctx->get_buffer(avctx, &s->picture) < 0) {
- av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
- return -1;
- }
- s->picture.interlaced_frame = 1;
- s->picture.top_field_first = 0;
-
- s->buf = buf;
- avctx->execute(avctx, dv_decode_video_segment, s->sys->work_chunks, NULL,
- dv_work_pool_size(s->sys), sizeof(DVwork_chunk));
-
- emms_c();
-
- /* return image */
- *data_size = sizeof(AVFrame);
- *(AVFrame*)data = s->picture;
-
- /* Determine the codec's sample_aspect ratio from the packet */
- vsc_pack = buf + 80*5 + 48 + 5;
- if ( *vsc_pack == dv_video_control ) {
- apt = buf[4] & 0x07;
- is16_9 = (vsc_pack && ((vsc_pack[2] & 0x07) == 0x02 || (!apt && (vsc_pack[2] & 0x07) == 0x07)));
- avctx->sample_aspect_ratio = s->sys->sar[is16_9];
- }
-
- return s->sys->frame_size;
-}
-#endif /* CONFIG_DVVIDEO_DECODER */
-
-
static inline int dv_write_pack(enum dv_pack_type pack_id, DVVideoContext *c,
uint8_t* buf)
{
@@ -1283,7 +924,7 @@ static int dvvideo_encode_frame(AVCodecContext *c, AVPacket *pkt,
int ret;
s->sys = avpriv_dv_codec_profile(c);
- if (!s->sys || dv_init_dynamic_tables(s->sys))
+ if (!s->sys || ff_dv_init_dynamic_tables(s->sys))
return -1;
if ((ret = ff_alloc_packet(pkt, s->sys->frame_size)) < 0) {
av_log(c, AV_LOG_ERROR, "Error getting output packet.\n");
@@ -1308,20 +949,7 @@ static int dvvideo_encode_frame(AVCodecContext *c, AVPacket *pkt,
return 0;
}
-#endif
-
-static int dvvideo_close(AVCodecContext *c)
-{
- DVVideoContext *s = c->priv_data;
-
- if (s->picture.data[0])
- c->release_buffer(c, &s->picture);
- return 0;
-}
-
-
-#if CONFIG_DVVIDEO_ENCODER
AVCodec ff_dvvideo_encoder = {
.name = "dvvideo",
.type = AVMEDIA_TYPE_VIDEO,
@@ -1334,18 +962,3 @@ AVCodec ff_dvvideo_encoder = {
.long_name = NULL_IF_CONFIG_SMALL("DV (Digital Video)"),
};
#endif // CONFIG_DVVIDEO_ENCODER
-
-#if CONFIG_DVVIDEO_DECODER
-AVCodec ff_dvvideo_decoder = {
- .name = "dvvideo",
- .type = AVMEDIA_TYPE_VIDEO,
- .id = CODEC_ID_DVVIDEO,
- .priv_data_size = sizeof(DVVideoContext),
- .init = dvvideo_init,
- .close = dvvideo_close,
- .decode = dvvideo_decode_frame,
- .capabilities = CODEC_CAP_DR1 | CODEC_CAP_SLICE_THREADS,
- .max_lowres = 3,
- .long_name = NULL_IF_CONFIG_SMALL("DV (Digital Video)"),
-};
-#endif
diff --git a/libavcodec/dv_tablegen.h b/libavcodec/dv_tablegen.h
index 4fa8d91..8164acd 100644
--- a/libavcodec/dv_tablegen.h
+++ b/libavcodec/dv_tablegen.h
@@ -24,6 +24,8 @@
#define AVCODEC_DV_TABLEGEN_H
#include <stdint.h>
+
+#include "libavutil/attributes.h"
#include "dv_vlc_data.h"
#if CONFIG_SMALL
@@ -46,7 +48,7 @@ typedef struct dv_vlc_pair {
#else
static struct dv_vlc_pair dv_vlc_map[DV_VLC_MAP_RUN_SIZE][DV_VLC_MAP_LEV_SIZE];
-static void dv_vlc_map_tableinit(void)
+static void av_unused dv_vlc_map_tableinit(void)
{
int i, j;
for (i = 0; i < NB_DV_VLC - 1; i++) {
diff --git a/libavcodec/dvdata.h b/libavcodec/dvdata.h
index d729b4d..8544d61 100644
--- a/libavcodec/dvdata.h
+++ b/libavcodec/dvdata.h
@@ -29,6 +29,8 @@
#include "libavutil/rational.h"
#include "avcodec.h"
+#include "dsputil.h"
+#include "get_bits.h"
typedef struct DVwork_chunk {
uint16_t buf_offset;
@@ -65,6 +67,20 @@ typedef struct DVprofile {
const uint8_t (*audio_shuffle)[9]; /* PCM shuffling table */
} DVprofile;
+typedef struct DVVideoContext {
+ const DVprofile *sys;
+ AVFrame picture;
+ AVCodecContext *avctx;
+ uint8_t *buf;
+
+ uint8_t dv_zigzag[2][64];
+
+ void (*get_pixels)(DCTELEM *block, const uint8_t *pixels, int line_size);
+ void (*fdct[2])(DCTELEM *block);
+ void (*idct_put[2])(uint8_t *dest, int line_size, DCTELEM *block);
+ me_cmp_func ildct_cmp;
+} DVVideoContext;
+
enum dv_section_type {
dv_sect_header = 0x1f,
dv_sect_subcode = 0x3f,
@@ -106,8 +122,36 @@ enum dv_pack_type {
*/
#define DV_MAX_BPM 8
+#define TEX_VLC_BITS 9
+
+extern RL_VLC_ELEM ff_dv_rl_vlc[1184];
+
const DVprofile* avpriv_dv_frame_profile(const DVprofile *sys,
const uint8_t* frame, unsigned buf_size);
const DVprofile* avpriv_dv_codec_profile(AVCodecContext* codec);
+int ff_dv_init_dynamic_tables(const DVprofile *d);
+int ff_dvvideo_init(AVCodecContext *avctx);
+
+static inline int dv_work_pool_size(const DVprofile *d)
+{
+ int size = d->n_difchan*d->difseg_size*27;
+ if (DV_PROFILE_IS_1080i50(d))
+ size -= 3*27;
+ if (DV_PROFILE_IS_720p50(d))
+ size -= 4*27;
+ return size;
+}
+
+static inline void dv_calculate_mb_xy(DVVideoContext *s, DVwork_chunk *work_chunk, int m, int *mb_x, int *mb_y)
+{
+ *mb_x = work_chunk->mb_coordinates[m] & 0xff;
+ *mb_y = work_chunk->mb_coordinates[m] >> 8;
+
+ /* We work with 720p frames split in half. The odd half-frame (chan==2,3) is displaced :-( */
+ if (s->sys->height == 720 && !(s->buf[1]&0x0C)) {
+ *mb_y -= (*mb_y>17)?18:-72; /* shifting the Y coordinate down by 72/2 macro blocks */
+ }
+}
+
#endif /* AVCODEC_DVDATA_H */
diff --git a/libavcodec/dvdec.c b/libavcodec/dvdec.c
new file mode 100644
index 0000000..689ae7c
--- /dev/null
+++ b/libavcodec/dvdec.c
@@ -0,0 +1,386 @@
+/*
+ * DV decoder
+ * Copyright (c) 2002 Fabrice Bellard
+ * Copyright (c) 2004 Roman Shaposhnik
+ *
+ * 50 Mbps (DVCPRO50) support
+ * Copyright (c) 2006 Daniel Maas <dmaas at maasdigital.com>
+ *
+ * 100 Mbps (DVCPRO HD) support
+ * Initial code by Daniel Maas <dmaas at maasdigital.com> (funded by BBC R&D)
+ * Final code by Roman Shaposhnik
+ *
+ * Many thanks to Dan Dennedy <dan at dennedy.org> for providing wealth
+ * of DV technical info.
+ *
+ * This file is part of Libav.
+ *
+ * Libav is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * Libav is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file
+ * DV decoder
+ */
+
+#include "libavutil/pixdesc.h"
+#include "avcodec.h"
+#include "dsputil.h"
+#include "get_bits.h"
+#include "put_bits.h"
+#include "simple_idct.h"
+#include "dvdata.h"
+#include "dvquant.h"
+#include "dv_tablegen.h"
+
+typedef struct BlockInfo {
+ const uint32_t *factor_table;
+ const uint8_t *scan_table;
+ uint8_t pos; /* position in block */
+ void (*idct_put)(uint8_t *dest, int line_size, DCTELEM *block);
+ uint8_t partial_bit_count;
+ uint32_t partial_bit_buffer;
+ int shift_offset;
+} BlockInfo;
+
+/* decode AC coefficients */
+static void dv_decode_ac(GetBitContext *gb, BlockInfo *mb, DCTELEM *block)
+{
+ int last_index = gb->size_in_bits;
+ const uint8_t *scan_table = mb->scan_table;
+ const uint32_t *factor_table = mb->factor_table;
+ int pos = mb->pos;
+ int partial_bit_count = mb->partial_bit_count;
+ int level, run, vlc_len, index;
+
+ OPEN_READER(re, gb);
+ UPDATE_CACHE(re, gb);
+
+ /* if we must parse a partial VLC, we do it here */
+ if (partial_bit_count > 0) {
+ re_cache = re_cache >> partial_bit_count | mb->partial_bit_buffer;
+ re_index -= partial_bit_count;
+ mb->partial_bit_count = 0;
+ }
+
+ /* get the AC coefficients until last_index is reached */
+ for (;;) {
+ av_dlog(NULL, "%2d: bits=%04x index=%d\n", pos, SHOW_UBITS(re, gb, 16),
+ re_index);
+ /* our own optimized GET_RL_VLC */
+ index = NEG_USR32(re_cache, TEX_VLC_BITS);
+ vlc_len = ff_dv_rl_vlc[index].len;
+ if (vlc_len < 0) {
+ index = NEG_USR32((unsigned)re_cache << TEX_VLC_BITS, -vlc_len) +
+ ff_dv_rl_vlc[index].level;
+ vlc_len = TEX_VLC_BITS - vlc_len;
+ }
+ level = ff_dv_rl_vlc[index].level;
+ run = ff_dv_rl_vlc[index].run;
+
+ /* gotta check if we're still within gb boundaries */
+ if (re_index + vlc_len > last_index) {
+ /* should be < 16 bits otherwise a codeword could have been parsed */
+ mb->partial_bit_count = last_index - re_index;
+ mb->partial_bit_buffer = re_cache & ~(-1u >> mb->partial_bit_count);
+ re_index = last_index;
+ break;
+ }
+ re_index += vlc_len;
+
+ av_dlog(NULL, "run=%d level=%d\n", run, level);
+ pos += run;
+ if (pos >= 64)
+ break;
+
+ level = (level * factor_table[pos] + (1 << (dv_iweight_bits - 1))) >> dv_iweight_bits;
+ block[scan_table[pos]] = level;
+
+ UPDATE_CACHE(re, gb);
+ }
+ CLOSE_READER(re, gb);
+ mb->pos = pos;
+}
+
+static inline void bit_copy(PutBitContext *pb, GetBitContext *gb)
+{
+ int bits_left = get_bits_left(gb);
+ while (bits_left >= MIN_CACHE_BITS) {
+ put_bits(pb, MIN_CACHE_BITS, get_bits(gb, MIN_CACHE_BITS));
+ bits_left -= MIN_CACHE_BITS;
+ }
+ if (bits_left > 0) {
+ put_bits(pb, bits_left, get_bits(gb, bits_left));
+ }
+}
+
+/* mb_x and mb_y are in units of 8 pixels */
+static int dv_decode_video_segment(AVCodecContext *avctx, void *arg)
+{
+ DVVideoContext *s = avctx->priv_data;
+ DVwork_chunk *work_chunk = arg;
+ int quant, dc, dct_mode, class1, j;
+ int mb_index, mb_x, mb_y, last_index;
+ int y_stride, linesize;
+ DCTELEM *block, *block1;
+ int c_offset;
+ uint8_t *y_ptr;
+ const uint8_t *buf_ptr;
+ PutBitContext pb, vs_pb;
+ GetBitContext gb;
+ BlockInfo mb_data[5 * DV_MAX_BPM], *mb, *mb1;
+ LOCAL_ALIGNED_16(DCTELEM, sblock, [5*DV_MAX_BPM], [64]);
+ LOCAL_ALIGNED_16(uint8_t, mb_bit_buffer, [ 80 + FF_INPUT_BUFFER_PADDING_SIZE]); /* allow some slack */
+ LOCAL_ALIGNED_16(uint8_t, vs_bit_buffer, [5*80 + FF_INPUT_BUFFER_PADDING_SIZE]); /* allow some slack */
+ const int log2_blocksize = 3-s->avctx->lowres;
+ int is_field_mode[5];
+
+ assert((((int)mb_bit_buffer) & 7) == 0);
+ assert((((int)vs_bit_buffer) & 7) == 0);
+
+ memset(sblock, 0, 5*DV_MAX_BPM*sizeof(*sblock));
+
+ /* pass 1: read DC and AC coefficients in blocks */
+ buf_ptr = &s->buf[work_chunk->buf_offset*80];
+ block1 = &sblock[0][0];
+ mb1 = mb_data;
+ init_put_bits(&vs_pb, vs_bit_buffer, 5 * 80);
+ for (mb_index = 0; mb_index < 5; mb_index++, mb1 += s->sys->bpm, block1 += s->sys->bpm * 64) {
+ /* skip header */
+ quant = buf_ptr[3] & 0x0f;
+ buf_ptr += 4;
+ init_put_bits(&pb, mb_bit_buffer, 80);
+ mb = mb1;
+ block = block1;
+ is_field_mode[mb_index] = 0;
+ for (j = 0; j < s->sys->bpm; j++) {
+ last_index = s->sys->block_sizes[j];
+ init_get_bits(&gb, buf_ptr, last_index);
+
+ /* get the DC */
+ dc = get_sbits(&gb, 9);
+ dct_mode = get_bits1(&gb);
+ class1 = get_bits(&gb, 2);
+ if (DV_PROFILE_IS_HD(s->sys)) {
+ mb->idct_put = s->idct_put[0];
+ mb->scan_table = s->dv_zigzag[0];
+ mb->factor_table = &s->sys->idct_factor[(j >= 4)*4*16*64 + class1*16*64 + quant*64];
+ is_field_mode[mb_index] |= !j && dct_mode;
+ } else {
+ mb->idct_put = s->idct_put[dct_mode && log2_blocksize == 3];
+ mb->scan_table = s->dv_zigzag[dct_mode];
+ mb->factor_table = &s->sys->idct_factor[(class1 == 3)*2*22*64 + dct_mode*22*64 +
+ (quant + dv_quant_offset[class1])*64];
+ }
+ dc = dc << 2;
+ /* convert to unsigned because 128 is not added in the
+ standard IDCT */
+ dc += 1024;
+ block[0] = dc;
+ buf_ptr += last_index >> 3;
+ mb->pos = 0;
+ mb->partial_bit_count = 0;
+
+ av_dlog(avctx, "MB block: %d, %d ", mb_index, j);
+ dv_decode_ac(&gb, mb, block);
+
+ /* write the remaining bits in a new buffer only if the
+ block is finished */
+ if (mb->pos >= 64)
+ bit_copy(&pb, &gb);
+
+ block += 64;
+ mb++;
+ }
+
+ /* pass 2: we can do it just after */
+ av_dlog(avctx, "***pass 2 size=%d MB#=%d\n", put_bits_count(&pb), mb_index);
+ block = block1;
+ mb = mb1;
+ init_get_bits(&gb, mb_bit_buffer, put_bits_count(&pb));
+ put_bits32(&pb, 0); // padding must be zeroed
+ flush_put_bits(&pb);
+ for (j = 0; j < s->sys->bpm; j++, block += 64, mb++) {
+ if (mb->pos < 64 && get_bits_left(&gb) > 0) {
+ dv_decode_ac(&gb, mb, block);
+ /* if still not finished, no need to parse other blocks */
+ if (mb->pos < 64)
+ break;
+ }
+ }
+ /* all blocks are finished, so the extra bytes can be used at
+ the video segment level */
+ if (j >= s->sys->bpm)
+ bit_copy(&vs_pb, &gb);
+ }
+
+ /* we need a pass over the whole video segment */
+ av_dlog(avctx, "***pass 3 size=%d\n", put_bits_count(&vs_pb));
+ block = &sblock[0][0];
+ mb = mb_data;
+ init_get_bits(&gb, vs_bit_buffer, put_bits_count(&vs_pb));
+ put_bits32(&vs_pb, 0); // padding must be zeroed
+ flush_put_bits(&vs_pb);
+ for (mb_index = 0; mb_index < 5; mb_index++) {
+ for (j = 0; j < s->sys->bpm; j++) {
+ if (mb->pos < 64) {
+ av_dlog(avctx, "start %d:%d\n", mb_index, j);
+ dv_decode_ac(&gb, mb, block);
+ }
+ if (mb->pos >= 64 && mb->pos < 127)
+ av_log(avctx, AV_LOG_ERROR, "AC EOB marker is absent pos=%d\n", mb->pos);
+ block += 64;
+ mb++;
+ }
+ }
+
+ /* compute idct and place blocks */
+ block = &sblock[0][0];
+ mb = mb_data;
+ for (mb_index = 0; mb_index < 5; mb_index++) {
+ dv_calculate_mb_xy(s, work_chunk, mb_index, &mb_x, &mb_y);
+
+ /* idct_put'ting luminance */
+ if ((s->sys->pix_fmt == PIX_FMT_YUV420P) ||
+ (s->sys->pix_fmt == PIX_FMT_YUV411P && mb_x >= (704 / 8)) ||
+ (s->sys->height >= 720 && mb_y != 134)) {
+ y_stride = (s->picture.linesize[0] << ((!is_field_mode[mb_index]) * log2_blocksize));
+ } else {
+ y_stride = (2 << log2_blocksize);
+ }
+ y_ptr = s->picture.data[0] + ((mb_y * s->picture.linesize[0] + mb_x) << log2_blocksize);
+ linesize = s->picture.linesize[0] << is_field_mode[mb_index];
+ mb[0] .idct_put(y_ptr , linesize, block + 0*64);
+ if (s->sys->video_stype == 4) { /* SD 422 */
+ mb[2].idct_put(y_ptr + (1 << log2_blocksize) , linesize, block + 2*64);
+ } else {
+ mb[1].idct_put(y_ptr + (1 << log2_blocksize) , linesize, block + 1*64);
+ mb[2].idct_put(y_ptr + y_stride, linesize, block + 2*64);
+ mb[3].idct_put(y_ptr + (1 << log2_blocksize) + y_stride, linesize, block + 3*64);
+ }
+ mb += 4;
+ block += 4*64;
+
+ /* idct_put'ting chrominance */
+ c_offset = (((mb_y >> (s->sys->pix_fmt == PIX_FMT_YUV420P)) * s->picture.linesize[1] +
+ (mb_x >> ((s->sys->pix_fmt == PIX_FMT_YUV411P) ? 2 : 1))) << log2_blocksize);
+ for (j = 2; j; j--) {
+ uint8_t *c_ptr = s->picture.data[j] + c_offset;
+ if (s->sys->pix_fmt == PIX_FMT_YUV411P && mb_x >= (704 / 8)) {
+ uint64_t aligned_pixels[64/8];
+ uint8_t *pixels = (uint8_t*)aligned_pixels;
+ uint8_t *c_ptr1, *ptr1;
+ int x, y;
+ mb->idct_put(pixels, 8, block);
+ for (y = 0; y < (1 << log2_blocksize); y++, c_ptr += s->picture.linesize[j], pixels += 8) {
+ ptr1 = pixels + (1 << (log2_blocksize - 1));
+ c_ptr1 = c_ptr + (s->picture.linesize[j] << log2_blocksize);
+ for (x = 0; x < (1 << (log2_blocksize - 1)); x++) {
+ c_ptr[x] = pixels[x];
+ c_ptr1[x] = ptr1[x];
+ }
+ }
+ block += 64; mb++;
+ } else {
+ y_stride = (mb_y == 134) ? (1 << log2_blocksize) :
+ s->picture.linesize[j] << ((!is_field_mode[mb_index]) * log2_blocksize);
+ linesize = s->picture.linesize[j] << is_field_mode[mb_index];
+ (mb++)-> idct_put(c_ptr , linesize, block); block += 64;
+ if (s->sys->bpm == 8) {
+ (mb++)->idct_put(c_ptr + y_stride, linesize, block); block += 64;
+ }
+ }
+ }
+ }
+ return 0;
+}
+
+/* NOTE: exactly one frame must be given (120000 bytes for NTSC,
+ 144000 bytes for PAL - or twice those for 50Mbps) */
+static int dvvideo_decode_frame(AVCodecContext *avctx,
+ void *data, int *data_size,
+ AVPacket *avpkt)
+{
+ const uint8_t *buf = avpkt->data;
+ int buf_size = avpkt->size;
+ DVVideoContext *s = avctx->priv_data;
+ const uint8_t* vsc_pack;
+ int apt, is16_9;
+
+ s->sys = avpriv_dv_frame_profile(s->sys, buf, buf_size);
+ if (!s->sys || buf_size < s->sys->frame_size || ff_dv_init_dynamic_tables(s->sys)) {
+ av_log(avctx, AV_LOG_ERROR, "could not find dv frame profile\n");
+ return -1; /* NOTE: we only accept several full frames */
+ }
+
+ if (s->picture.data[0])
+ avctx->release_buffer(avctx, &s->picture);
+
+ s->picture.reference = 0;
+ s->picture.key_frame = 1;
+ s->picture.pict_type = AV_PICTURE_TYPE_I;
+ avctx->pix_fmt = s->sys->pix_fmt;
+ avctx->time_base = s->sys->time_base;
+ avcodec_set_dimensions(avctx, s->sys->width, s->sys->height);
+ if (avctx->get_buffer(avctx, &s->picture) < 0) {
+ av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
+ return -1;
+ }
+ s->picture.interlaced_frame = 1;
+ s->picture.top_field_first = 0;
+
+ s->buf = buf;
+ avctx->execute(avctx, dv_decode_video_segment, s->sys->work_chunks, NULL,
+ dv_work_pool_size(s->sys), sizeof(DVwork_chunk));
+
+ emms_c();
+
+ /* return image */
+ *data_size = sizeof(AVFrame);
+ *(AVFrame*)data = s->picture;
+
+ /* Determine the codec's sample_aspect ratio from the packet */
+ vsc_pack = buf + 80*5 + 48 + 5;
+ if ( *vsc_pack == dv_video_control ) {
+ apt = buf[4] & 0x07;
+ is16_9 = (vsc_pack && ((vsc_pack[2] & 0x07) == 0x02 || (!apt && (vsc_pack[2] & 0x07) == 0x07)));
+ avctx->sample_aspect_ratio = s->sys->sar[is16_9];
+ }
+
+ return s->sys->frame_size;
+}
+
+static int dvvideo_close(AVCodecContext *c)
+{
+ DVVideoContext *s = c->priv_data;
+
+ if (s->picture.data[0])
+ c->release_buffer(c, &s->picture);
+
+ return 0;
+}
+
+AVCodec ff_dvvideo_decoder = {
+ .name = "dvvideo",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .id = CODEC_ID_DVVIDEO,
+ .priv_data_size = sizeof(DVVideoContext),
+ .init = ff_dvvideo_init,
+ .close = dvvideo_close,
+ .decode = dvvideo_decode_frame,
+ .capabilities = CODEC_CAP_DR1 | CODEC_CAP_SLICE_THREADS,
+ .max_lowres = 3,
+ .long_name = NULL_IF_CONFIG_SMALL("DV (Digital Video)"),
+};
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