FFmpeg
dsicin.c
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1 /*
2  * Delphine Software International CIN File Demuxer
3  * Copyright (c) 2006 Gregory Montoir (cyx@users.sourceforge.net)
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 /**
23  * @file
24  * Delphine Software International CIN file demuxer
25  */
26 
28 #include "libavutil/intreadwrite.h"
29 #include "avformat.h"
30 #include "demux.h"
31 #include "internal.h"
32 #include "avio_internal.h"
33 
34 
35 typedef struct CinFileHeader {
44 
45 typedef struct CinFrameHeader {
52 
53 typedef struct CinDemuxContext {
62 
63 
64 static int cin_probe(const AVProbeData *p)
65 {
66  /* header starts with this special marker */
67  if (AV_RL32(&p->buf[0]) != 0x55AA0000)
68  return 0;
69 
70  /* for accuracy, check some header field values */
71  if (AV_RL32(&p->buf[12]) != 22050 || p->buf[16] != 16 || p->buf[17] != 0)
72  return 0;
73 
74  return AVPROBE_SCORE_MAX;
75 }
76 
78  CinFileHeader *hdr = &cin->file_header;
79 
80  if (avio_rl32(pb) != 0x55AA0000)
81  return AVERROR_INVALIDDATA;
82 
83  hdr->video_frame_size = avio_rl32(pb);
84  hdr->video_frame_width = avio_rl16(pb);
85  hdr->video_frame_height = avio_rl16(pb);
86  hdr->audio_frequency = avio_rl32(pb);
87  hdr->audio_bits = avio_r8(pb);
88  hdr->audio_stereo = avio_r8(pb);
89  hdr->audio_frame_size = avio_rl16(pb);
90 
91  if (hdr->audio_frequency != 22050 || hdr->audio_bits != 16 || hdr->audio_stereo != 0)
92  return AVERROR_INVALIDDATA;
93 
94  return 0;
95 }
96 
98 {
99  int rc;
100  CinDemuxContext *cin = s->priv_data;
101  CinFileHeader *hdr = &cin->file_header;
102  AVIOContext *pb = s->pb;
103  AVStream *st;
104 
105  rc = cin_read_file_header(cin, pb);
106  if (rc)
107  return rc;
108 
109  cin->video_stream_pts = 0;
110  cin->audio_stream_pts = 0;
111  cin->audio_buffer_size = 0;
112 
113  /* initialize the video decoder stream */
114  st = avformat_new_stream(s, NULL);
115  if (!st)
116  return AVERROR(ENOMEM);
117 
118  avpriv_set_pts_info(st, 32, 1, 12);
119  cin->video_stream_index = st->index;
122  st->codecpar->codec_tag = 0; /* no fourcc */
123  st->codecpar->width = hdr->video_frame_width;
124  st->codecpar->height = hdr->video_frame_height;
125 
126  /* initialize the audio decoder stream */
127  st = avformat_new_stream(s, NULL);
128  if (!st)
129  return AVERROR(ENOMEM);
130 
131  avpriv_set_pts_info(st, 32, 1, 22050);
132  cin->audio_stream_index = st->index;
135  st->codecpar->codec_tag = 0; /* no tag */
137  st->codecpar->sample_rate = 22050;
139  st->codecpar->bit_rate = st->codecpar->sample_rate *
142 
143  return 0;
144 }
145 
147  CinFrameHeader *hdr = &cin->frame_header;
148 
149  hdr->video_frame_type = avio_r8(pb);
150  hdr->audio_frame_type = avio_r8(pb);
151  hdr->pal_colors_count = avio_rl16(pb);
152  hdr->video_frame_size = avio_rl32(pb);
153  hdr->audio_frame_size = avio_rl32(pb);
154 
155  if (avio_feof(pb) || pb->error)
156  return AVERROR(EIO);
157 
158  if (avio_rl32(pb) != 0xAA55AA55)
159  return AVERROR_INVALIDDATA;
160  if (hdr->video_frame_size < 0 || hdr->audio_frame_size < 0)
161  return AVERROR_INVALIDDATA;
162 
163  return 0;
164 }
165 
167 {
168  CinDemuxContext *cin = s->priv_data;
169  AVIOContext *pb = s->pb;
170  CinFrameHeader *hdr = &cin->frame_header;
171  int rc, palette_type;
172  int64_t pkt_size;
173  int ret;
174 
175  if (cin->audio_buffer_size == 0) {
176  rc = cin_read_frame_header(cin, pb);
177  if (rc)
178  return rc;
179 
180  if ((int16_t)hdr->pal_colors_count < 0) {
181  hdr->pal_colors_count = -(int16_t)hdr->pal_colors_count;
182  palette_type = 1;
183  } else {
184  palette_type = 0;
185  }
186 
187  /* palette and video packet */
188  pkt_size = (palette_type + 3LL) * hdr->pal_colors_count + hdr->video_frame_size;
189  if (pkt_size + 4 > INT_MAX)
190  return AVERROR_INVALIDDATA;
191 
192  pkt_size = ffio_limit(pb, pkt_size);
193 
194  ret = av_new_packet(pkt, 4 + pkt_size);
195  if (ret < 0)
196  return ret;
197 
199  pkt->pts = cin->video_stream_pts++;
200 
201  pkt->data[0] = palette_type;
202  pkt->data[1] = hdr->pal_colors_count & 0xFF;
203  pkt->data[2] = hdr->pal_colors_count >> 8;
204  pkt->data[3] = hdr->video_frame_type;
205 
206  ret = avio_read(pb, &pkt->data[4], pkt_size);
207  if (ret < 0) {
208  return ret;
209  }
210  if (ret < pkt_size)
211  av_shrink_packet(pkt, 4 + ret);
212 
213  /* sound buffer will be processed on next read_packet() call */
215  return 0;
216  }
217 
218  /* audio packet */
219  ret = av_get_packet(pb, pkt, cin->audio_buffer_size);
220  if (ret < 0)
221  return ret;
222 
224  pkt->pts = cin->audio_stream_pts;
225  pkt->duration = cin->audio_buffer_size - (pkt->pts == 0);
226  cin->audio_stream_pts += pkt->duration;
227  cin->audio_buffer_size = 0;
228  return 0;
229 }
230 
232  .p.name = "dsicin",
233  .p.long_name = NULL_IF_CONFIG_SMALL("Delphine Software International CIN"),
234  .priv_data_size = sizeof(CinDemuxContext),
238 };
CinDemuxContext::audio_buffer_size
int audio_buffer_size
Definition: dsicin.c:60
CinFrameHeader::audio_frame_size
int audio_frame_size
Definition: dsicin.c:49
AVERROR
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
AVCodecParameters::codec_type
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:51
CinFrameHeader
Definition: dsicin.c:45
avformat_new_stream
AVStream * avformat_new_stream(AVFormatContext *s, const struct AVCodec *c)
Add a new stream to a media file.
CinFrameHeader::audio_frame_type
int audio_frame_type
Definition: dsicin.c:46
AVPacket::data
uint8_t * data
Definition: packet.h:524
AVIOContext::error
int error
contains the error code or 0 if no error happened
Definition: avio.h:239
AVPacket::duration
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: packet.h:542
AVCodecParameters::codec_tag
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: codec_par.h:59
AVChannelLayout::nb_channels
int nb_channels
Number of channels in this layout.
Definition: channel_layout.h:313
CinFileHeader::audio_bits
int audio_bits
Definition: dsicin.c:40
AV_CODEC_ID_DSICINVIDEO
@ AV_CODEC_ID_DSICINVIDEO
Definition: codec_id.h:146
CinFileHeader::video_frame_width
int video_frame_width
Definition: dsicin.c:37
AVPROBE_SCORE_MAX
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:463
CinFileHeader::audio_frame_size
int audio_frame_size
Definition: dsicin.c:42
avpriv_set_pts_info
void avpriv_set_pts_info(AVStream *st, int pts_wrap_bits, unsigned int pts_num, unsigned int pts_den)
Set the time base and wrapping info for a given stream.
Definition: avformat.c:853
CinFrameHeader::video_frame_size
int video_frame_size
Definition: dsicin.c:50
av_shrink_packet
void av_shrink_packet(AVPacket *pkt, int size)
Reduce packet size, correctly zeroing padding.
Definition: packet.c:113
CinDemuxContext::video_stream_index
int video_stream_index
Definition: dsicin.c:55
CinDemuxContext::frame_header
CinFrameHeader frame_header
Definition: dsicin.c:59
cin_read_packet
static int cin_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: dsicin.c:166
ff_dsicin_demuxer
const FFInputFormat ff_dsicin_demuxer
Definition: dsicin.c:231
avio_rl16
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:714
pkt
AVPacket * pkt
Definition: movenc.c:60
CinFrameHeader::pal_colors_count
int pal_colors_count
Definition: dsicin.c:48
read_packet
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_read_callback.c:42
AV_CODEC_ID_DSICINAUDIO
@ AV_CODEC_ID_DSICINAUDIO
Definition: codec_id.h:466
intreadwrite.h
s
#define s(width, name)
Definition: cbs_vp9.c:198
av_new_packet
int av_new_packet(AVPacket *pkt, int size)
Allocate the payload of a packet and initialize its fields with default values.
Definition: packet.c:98
AVInputFormat::name
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:553
CinFrameHeader::video_frame_type
int video_frame_type
Definition: dsicin.c:47
AVProbeData::buf
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:453
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
AVCodecParameters::width
int width
Video only.
Definition: codec_par.h:134
if
if(ret)
Definition: filter_design.txt:179
AVFormatContext
Format I/O context.
Definition: avformat.h:1255
internal.h
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:766
read_header
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:550
NULL
#define NULL
Definition: coverity.c:32
CinFileHeader::audio_frequency
int audio_frequency
Definition: dsicin.c:39
AVProbeData
This structure contains the data a format has to probe a file.
Definition: avformat.h:451
CinDemuxContext::file_header
CinFileHeader file_header
Definition: dsicin.c:56
AVCodecParameters::ch_layout
AVChannelLayout ch_layout
Audio only.
Definition: codec_par.h:180
AVCodecParameters::sample_rate
int sample_rate
Audio only.
Definition: codec_par.h:184
CinFileHeader::video_frame_height
int video_frame_height
Definition: dsicin.c:38
avio_rl32
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:730
AVIOContext
Bytestream IO Context.
Definition: avio.h:160
CinDemuxContext::video_stream_pts
int64_t video_stream_pts
Definition: dsicin.c:58
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:94
AVChannelLayout
An AVChannelLayout holds information about the channel layout of audio data.
Definition: channel_layout.h:303
CinFileHeader::audio_stereo
int audio_stereo
Definition: dsicin.c:41
FFInputFormat::p
AVInputFormat p
The public AVInputFormat.
Definition: demux.h:41
avio_r8
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:603
cin_probe
static int cin_probe(const AVProbeData *p)
Definition: dsicin.c:64
ffio_limit
int ffio_limit(AVIOContext *s, int size)
Definition: aviobuf.c:1061
AVPacket::pts
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: packet.h:517
avio_internal.h
AVCodecParameters::height
int height
Definition: codec_par.h:135
demux.h
CinDemuxContext::audio_stream_pts
int64_t audio_stream_pts
Definition: dsicin.c:57
CinDemuxContext::audio_stream_index
int audio_stream_index
Definition: dsicin.c:54
av_get_packet
int av_get_packet(AVIOContext *s, AVPacket *pkt, int size)
Allocate and read the payload of a packet and initialize its fields with default values.
Definition: utils.c:91
cin_read_header
static int cin_read_header(AVFormatContext *s)
Definition: dsicin.c:97
ret
ret
Definition: filter_design.txt:187
AVStream
Stream structure.
Definition: avformat.h:743
cin_read_frame_header
static int cin_read_frame_header(CinDemuxContext *cin, AVIOContext *pb)
Definition: dsicin.c:146
avformat.h
CinFileHeader
Definition: dsicin.c:35
AV_RL32
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:92
AVStream::index
int index
stream index in AVFormatContext
Definition: avformat.h:749
channel_layout.h
avio_read
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:612
cin_read_file_header
static int cin_read_file_header(CinDemuxContext *cin, AVIOContext *pb)
Definition: dsicin.c:77
AVPacket::stream_index
int stream_index
Definition: packet.h:526
CinDemuxContext
Definition: dsicin.c:53
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
read_probe
static int read_probe(const AVProbeData *p)
Definition: cdg.c:30
AVCodecParameters::bits_per_coded_sample
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: codec_par.h:110
CinFileHeader::video_frame_size
int video_frame_size
Definition: dsicin.c:36
AV_CHANNEL_LAYOUT_MONO
#define AV_CHANNEL_LAYOUT_MONO
Definition: channel_layout.h:378
AVCodecParameters::codec_id
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:55
AVPacket
This structure stores compressed data.
Definition: packet.h:501
FFInputFormat
Definition: demux.h:37
AVCodecParameters::bit_rate
int64_t bit_rate
The average bitrate of the encoded data (in bits per second).
Definition: codec_par.h:97
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:61
avio_feof
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:346