FFmpeg
tiertexseq.c
Go to the documentation of this file.
1 /*
2  * Tiertex Limited SEQ 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  * Tiertex Limited SEQ file demuxer
25  */
26 
28 #include "avformat.h"
29 #include "internal.h"
30 
31 #define SEQ_FRAME_SIZE 6144
32 #define SEQ_FRAME_W 256
33 #define SEQ_FRAME_H 128
34 #define SEQ_NUM_FRAME_BUFFERS 30
35 #define SEQ_AUDIO_BUFFER_SIZE 882
36 #define SEQ_SAMPLE_RATE 22050
37 #define SEQ_FRAME_RATE 25
38 
39 
40 typedef struct TiertexSeqFrameBuffer {
41  int fill_size;
42  int data_size;
43  unsigned char *data;
45 
46 typedef struct SeqDemuxContext {
55  unsigned int current_pal_data_size;
56  unsigned int current_pal_data_offs;
58  unsigned char *current_video_data_ptr;
61 
62 
63 static int seq_probe(const AVProbeData *p)
64 {
65  int i;
66 
67  if (p->buf_size < 258)
68  return 0;
69 
70  /* there's no real header in a .seq file, the only thing they have in common */
71  /* is the first 256 bytes of the file which are always filled with 0 */
72  for (i = 0; i < 256; i++)
73  if (p->buf[i])
74  return 0;
75 
76  if(p->buf[256]==0 && p->buf[257]==0)
77  return 0;
78 
79  /* only one fourth of the score since the previous check is too naive */
80  return AVPROBE_SCORE_MAX / 4;
81 }
82 
84 {
85  int i, sz;
86  TiertexSeqFrameBuffer *seq_buffer;
87 
88  avio_seek(pb, 256, SEEK_SET);
89 
90  for (i = 0; i < SEQ_NUM_FRAME_BUFFERS; i++) {
91  sz = avio_rl16(pb);
92  if (sz == 0)
93  break;
94  else {
95  seq_buffer = &seq->frame_buffers[i];
96  seq_buffer->fill_size = 0;
97  seq_buffer->data_size = sz;
98  seq_buffer->data = av_malloc(sz);
99  if (!seq_buffer->data)
100  return AVERROR(ENOMEM);
101  }
102  }
103  seq->frame_buffers_count = i;
104  return 0;
105 }
106 
107 static int seq_fill_buffer(SeqDemuxContext *seq, AVIOContext *pb, int buffer_num, unsigned int data_offs, int data_size)
108 {
109  TiertexSeqFrameBuffer *seq_buffer;
110 
111  if (buffer_num >= SEQ_NUM_FRAME_BUFFERS)
112  return AVERROR_INVALIDDATA;
113 
114  seq_buffer = &seq->frame_buffers[buffer_num];
115  if (seq_buffer->fill_size + data_size > seq_buffer->data_size || data_size <= 0)
116  return AVERROR_INVALIDDATA;
117 
118  avio_seek(pb, seq->current_frame_offs + data_offs, SEEK_SET);
119  if (avio_read(pb, seq_buffer->data + seq_buffer->fill_size, data_size) != data_size)
120  return AVERROR(EIO);
121 
122  seq_buffer->fill_size += data_size;
123  return 0;
124 }
125 
127 {
128  unsigned int offset_table[4], buffer_num[4];
129  TiertexSeqFrameBuffer *seq_buffer;
130  int i, e, err;
131 
133  avio_seek(pb, seq->current_frame_offs, SEEK_SET);
134 
135  /* sound data */
137  if (seq->current_audio_data_offs) {
139  } else {
140  seq->current_audio_data_size = 0;
141  }
142 
143  /* palette data */
144  seq->current_pal_data_offs = avio_rl16(pb);
145  if (seq->current_pal_data_offs) {
146  seq->current_pal_data_size = 768;
147  } else {
148  seq->current_pal_data_size = 0;
149  }
150 
151  /* video data */
152  for (i = 0; i < 4; i++)
153  buffer_num[i] = avio_r8(pb);
154 
155  for (i = 0; i < 4; i++)
156  offset_table[i] = avio_rl16(pb);
157 
158  for (i = 0; i < 3; i++) {
159  if (offset_table[i]) {
160  for (e = i + 1; e < 3 && offset_table[e] == 0; e++);
161  err = seq_fill_buffer(seq, pb, buffer_num[1 + i],
162  offset_table[i],
163  offset_table[e] - offset_table[i]);
164  if (err)
165  return err;
166  }
167  }
168 
169  if (buffer_num[0] != 255) {
170  if (buffer_num[0] >= SEQ_NUM_FRAME_BUFFERS)
171  return AVERROR_INVALIDDATA;
172 
173  seq_buffer = &seq->frame_buffers[buffer_num[0]];
174  seq->current_video_data_size = seq_buffer->fill_size;
175  seq->current_video_data_ptr = seq_buffer->data;
176  seq_buffer->fill_size = 0;
177  } else {
178  seq->current_video_data_size = 0;
179  seq->current_video_data_ptr = 0;
180  }
181 
182  return 0;
183 }
184 
186 {
187  int i;
188  SeqDemuxContext *seq = s->priv_data;
189 
190  for (i = 0; i < SEQ_NUM_FRAME_BUFFERS; i++)
191  av_freep(&seq->frame_buffers[i].data);
192 
193  return 0;
194 }
195 
197 {
198  int i, rc;
199  SeqDemuxContext *seq = s->priv_data;
200  AVIOContext *pb = s->pb;
201  AVStream *st;
202 
203  /* init internal buffers */
204  rc = seq_init_frame_buffers(seq, pb);
205  if (rc) {
206  seq_read_close(s);
207  return rc;
208  }
209 
210  seq->current_frame_offs = 0;
211 
212  /* preload (no audio data, just buffer operations related data) */
213  for (i = 1; i <= 100; i++) {
214  rc = seq_parse_frame_data(seq, pb);
215  if (rc) {
216  seq_read_close(s);
217  return rc;
218  }
219  }
220 
221  seq->current_frame_pts = 0;
222 
223  seq->audio_buffer_full = 0;
224 
225  /* initialize the video decoder stream */
226  st = avformat_new_stream(s, NULL);
227  if (!st) {
228  seq_read_close(s);
229  return AVERROR(ENOMEM);
230  }
231 
233  seq->video_stream_index = st->index;
236  st->codecpar->codec_tag = 0; /* no fourcc */
237  st->codecpar->width = SEQ_FRAME_W;
238  st->codecpar->height = SEQ_FRAME_H;
239 
240  /* initialize the audio decoder stream */
241  st = avformat_new_stream(s, NULL);
242  if (!st) {
243  seq_read_close(s);
244  return AVERROR(ENOMEM);
245  }
246 
247  st->start_time = 0;
249  seq->audio_stream_index = st->index;
252  st->codecpar->codec_tag = 0; /* no tag */
253  st->codecpar->channels = 1;
259 
260  return 0;
261 }
262 
264 {
265  int rc;
266  SeqDemuxContext *seq = s->priv_data;
267  AVIOContext *pb = s->pb;
268 
269  if (!seq->audio_buffer_full) {
270  rc = seq_parse_frame_data(seq, pb);
271  if (rc)
272  return rc;
273 
274  /* video packet */
275  if (seq->current_pal_data_size + seq->current_video_data_size != 0) {
277  + seq->current_video_data_size);
278  if (rc < 0)
279  return rc;
280 
281  pkt->data[0] = 0;
282  if (seq->current_pal_data_size) {
283  pkt->data[0] |= 1;
284  avio_seek(pb, seq->current_frame_offs + seq->current_pal_data_offs, SEEK_SET);
285  if (avio_read(pb, &pkt->data[1], seq->current_pal_data_size) != seq->current_pal_data_size)
286  return AVERROR(EIO);
287  }
288  if (seq->current_video_data_size) {
289  pkt->data[0] |= 2;
290  memcpy(&pkt->data[1 + seq->current_pal_data_size],
293  }
295  pkt->pts = seq->current_frame_pts;
296 
297  /* sound buffer will be processed on next read_packet() call */
298  seq->audio_buffer_full = 1;
299  return 0;
300  }
301  }
302 
303  /* audio packet */
304  if (seq->current_audio_data_offs == 0) /* end of data reached */
305  return AVERROR(EIO);
306 
307  avio_seek(pb, seq->current_frame_offs + seq->current_audio_data_offs, SEEK_SET);
308  rc = av_get_packet(pb, pkt, seq->current_audio_data_size);
309  if (rc < 0)
310  return rc;
311 
313  seq->current_frame_pts++;
314 
315  seq->audio_buffer_full = 0;
316  return 0;
317 }
318 
320  .name = "tiertexseq",
321  .long_name = NULL_IF_CONFIG_SMALL("Tiertex Limited SEQ"),
322  .priv_data_size = sizeof(SeqDemuxContext),
327 };
seq_probe
static int seq_probe(const AVProbeData *p)
Definition: tiertexseq.c:63
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
avformat_new_stream
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4547
seq_read_packet
static int seq_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: tiertexseq.c:263
AVCodecParameters::codec_type
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:56
AV_CH_LAYOUT_MONO
#define AV_CH_LAYOUT_MONO
Definition: channel_layout.h:90
SEQ_FRAME_RATE
#define SEQ_FRAME_RATE
Definition: tiertexseq.c:37
SeqDemuxContext::current_frame_offs
int current_frame_offs
Definition: tiertexseq.c:50
AVPacket::data
uint8_t * data
Definition: packet.h:369
AVCodecParameters::codec_tag
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: codec_par.h:64
AVProbeData::buf_size
int buf_size
Size of buf except extra allocated bytes.
Definition: avformat.h:444
seq_read_close
static int seq_read_close(AVFormatContext *s)
Definition: tiertexseq.c:185
av_malloc
#define av_malloc(s)
Definition: tableprint_vlc.h:31
AVPROBE_SCORE_MAX
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:453
AVCodecParameters::channels
int channels
Audio only.
Definition: codec_par.h:166
AV_CODEC_ID_PCM_S16BE
@ AV_CODEC_ID_PCM_S16BE
Definition: codec_id.h:314
SeqDemuxContext::current_audio_data_offs
unsigned int current_audio_data_offs
Definition: tiertexseq.c:54
read_close
static av_cold int read_close(AVFormatContext *ctx)
Definition: libcdio.c:145
avio_rl16
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:734
SEQ_SAMPLE_RATE
#define SEQ_SAMPLE_RATE
Definition: tiertexseq.c:36
pkt
AVPacket * pkt
Definition: movenc.c:59
AVInputFormat
Definition: avformat.h:640
s
#define s(width, name)
Definition: cbs_vp9.c:257
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: avpacket.c:99
SeqDemuxContext::current_frame_pts
int current_frame_pts
Definition: tiertexseq.c:49
AVInputFormat::name
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:645
AVProbeData::buf
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:443
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
AVCodecParameters::width
int width
Video only.
Definition: codec_par.h:126
SEQ_FRAME_SIZE
#define SEQ_FRAME_SIZE
Definition: tiertexseq.c:31
AV_CODEC_ID_TIERTEXSEQVIDEO
@ AV_CODEC_ID_TIERTEXSEQVIDEO
Definition: codec_id.h:144
SeqDemuxContext::audio_buffer_full
int audio_buffer_full
Definition: tiertexseq.c:59
AVFormatContext
Format I/O context.
Definition: avformat.h:1231
internal.h
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1038
read_header
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:527
NULL
#define NULL
Definition: coverity.c:32
read_probe
static int read_probe(const AVProbeData *pd)
Definition: jvdec.c:55
SeqDemuxContext::audio_stream_index
int audio_stream_index
Definition: tiertexseq.c:47
seq_read_header
static int seq_read_header(AVFormatContext *s)
Definition: tiertexseq.c:196
AVProbeData
This structure contains the data a format has to probe a file.
Definition: avformat.h:441
AVCodecParameters::sample_rate
int sample_rate
Audio only.
Definition: codec_par.h:170
SeqDemuxContext::frame_buffers_count
int frame_buffers_count
Definition: tiertexseq.c:52
AVIOContext
Bytestream IO Context.
Definition: avio.h:161
ff_tiertexseq_demuxer
AVInputFormat ff_tiertexseq_demuxer
Definition: tiertexseq.c:319
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:117
avpriv_set_pts_info
void avpriv_set_pts_info(AVStream *s, int pts_wrap_bits, unsigned int pts_num, unsigned int pts_den)
Set the time base and wrapping info for a given stream.
Definition: utils.c:4993
TiertexSeqFrameBuffer::data_size
int data_size
Definition: tiertexseq.c:42
seq_init_frame_buffers
static int seq_init_frame_buffers(SeqDemuxContext *seq, AVIOContext *pb)
Definition: tiertexseq.c:83
SEQ_FRAME_H
#define SEQ_FRAME_H
Definition: tiertexseq.c:33
SEQ_AUDIO_BUFFER_SIZE
#define SEQ_AUDIO_BUFFER_SIZE
Definition: tiertexseq.c:35
avio_r8
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:624
SEQ_FRAME_W
#define SEQ_FRAME_W
Definition: tiertexseq.c:32
TiertexSeqFrameBuffer::data
unsigned char * data
Definition: tiertexseq.c:43
TiertexSeqFrameBuffer
Definition: tiertexseq.c:40
offset_table
static const uint8_t offset_table[]
Definition: escape130.c:41
SeqDemuxContext::current_video_data_size
unsigned int current_video_data_size
Definition: tiertexseq.c:57
i
int i
Definition: input.c:407
AVPacket::pts
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: packet.h:362
AVCodecParameters::height
int height
Definition: codec_par.h:127
AVCodecParameters::block_align
int block_align
Audio only.
Definition: codec_par.h:177
SeqDemuxContext
Definition: tiertexseq.c:46
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:310
read_packet
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
AVStream
Stream structure.
Definition: avformat.h:873
avio_seek
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:253
seq_parse_frame_data
static int seq_parse_frame_data(SeqDemuxContext *seq, AVIOContext *pb)
Definition: tiertexseq.c:126
avformat.h
SEQ_NUM_FRAME_BUFFERS
#define SEQ_NUM_FRAME_BUFFERS
Definition: tiertexseq.c:34
SeqDemuxContext::current_pal_data_offs
unsigned int current_pal_data_offs
Definition: tiertexseq.c:56
SeqDemuxContext::current_video_data_ptr
unsigned char * current_video_data_ptr
Definition: tiertexseq.c:58
AVStream::index
int index
stream index in AVFormatContext
Definition: avformat.h:874
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:633
SeqDemuxContext::frame_buffers
TiertexSeqFrameBuffer frame_buffers[SEQ_NUM_FRAME_BUFFERS]
Definition: tiertexseq.c:51
AVPacket::stream_index
int stream_index
Definition: packet.h:371
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
AVCodecParameters::bits_per_coded_sample
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: codec_par.h:102
SeqDemuxContext::video_stream_index
int video_stream_index
Definition: tiertexseq.c:48
seq_fill_buffer
static int seq_fill_buffer(SeqDemuxContext *seq, AVIOContext *pb, int buffer_num, unsigned int data_offs, int data_size)
Definition: tiertexseq.c:107
AVCodecParameters::codec_id
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
AVPacket
This structure stores compressed data.
Definition: packet.h:346
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:35
SeqDemuxContext::current_audio_data_size
unsigned int current_audio_data_size
Definition: tiertexseq.c:53
AVCodecParameters::channel_layout
uint64_t channel_layout
Audio only.
Definition: codec_par.h:162
AVCodecParameters::bit_rate
int64_t bit_rate
The average bitrate of the encoded data (in bits per second).
Definition: codec_par.h:89
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
AVStream::start_time
int64_t start_time
Decoding: pts of the first frame of the stream in presentation order, in stream time base.
Definition: avformat.h:912
SeqDemuxContext::current_pal_data_size
unsigned int current_pal_data_size
Definition: tiertexseq.c:55
TiertexSeqFrameBuffer::fill_size
int fill_size
Definition: tiertexseq.c:41