FFmpeg
tiertexseq.c
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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 < 0)
206  return rc;
207 
208  seq->current_frame_offs = 0;
209 
210  /* preload (no audio data, just buffer operations related data) */
211  for (i = 1; i <= 100; i++) {
212  rc = seq_parse_frame_data(seq, pb);
213  if (rc < 0)
214  return rc;
215  }
216 
217  seq->current_frame_pts = 0;
218 
219  seq->audio_buffer_full = 0;
220 
221  /* initialize the video decoder stream */
222  st = avformat_new_stream(s, NULL);
223  if (!st)
224  return AVERROR(ENOMEM);
225 
227  seq->video_stream_index = st->index;
230  st->codecpar->codec_tag = 0; /* no fourcc */
231  st->codecpar->width = SEQ_FRAME_W;
232  st->codecpar->height = SEQ_FRAME_H;
233 
234  /* initialize the audio decoder stream */
235  st = avformat_new_stream(s, NULL);
236  if (!st)
237  return AVERROR(ENOMEM);
238 
239  st->start_time = 0;
241  seq->audio_stream_index = st->index;
244  st->codecpar->codec_tag = 0; /* no tag */
250 
251  return 0;
252 }
253 
255 {
256  int rc;
257  SeqDemuxContext *seq = s->priv_data;
258  AVIOContext *pb = s->pb;
259 
260  if (!seq->audio_buffer_full) {
261  rc = seq_parse_frame_data(seq, pb);
262  if (rc)
263  return rc;
264 
265  /* video packet */
266  if (seq->current_pal_data_size + seq->current_video_data_size != 0) {
268  + seq->current_video_data_size);
269  if (rc < 0)
270  return rc;
271 
272  pkt->data[0] = 0;
273  if (seq->current_pal_data_size) {
274  pkt->data[0] |= 1;
275  avio_seek(pb, seq->current_frame_offs + seq->current_pal_data_offs, SEEK_SET);
276  if (avio_read(pb, &pkt->data[1], seq->current_pal_data_size) != seq->current_pal_data_size)
277  return AVERROR(EIO);
278  }
279  if (seq->current_video_data_size) {
280  pkt->data[0] |= 2;
281  memcpy(&pkt->data[1 + seq->current_pal_data_size],
284  }
286  pkt->pts = seq->current_frame_pts;
287 
288  /* sound buffer will be processed on next read_packet() call */
289  seq->audio_buffer_full = 1;
290  return 0;
291  }
292  }
293 
294  /* audio packet */
295  if (seq->current_audio_data_offs == 0) /* end of data reached */
296  return AVERROR(EIO);
297 
298  avio_seek(pb, seq->current_frame_offs + seq->current_audio_data_offs, SEEK_SET);
299  rc = av_get_packet(pb, pkt, seq->current_audio_data_size);
300  if (rc < 0)
301  return rc;
302 
304  seq->current_frame_pts++;
305 
306  seq->audio_buffer_full = 0;
307  return 0;
308 }
309 
311  .name = "tiertexseq",
312  .long_name = NULL_IF_CONFIG_SMALL("Tiertex Limited SEQ"),
313  .priv_data_size = sizeof(SeqDemuxContext),
314  .flags_internal = FF_FMT_INIT_CLEANUP,
319 };
seq_probe
static int seq_probe(const AVProbeData *p)
Definition: tiertexseq.c:63
FF_FMT_INIT_CLEANUP
#define FF_FMT_INIT_CLEANUP
For an AVInputFormat with this flag set read_close() needs to be called by the caller upon read_heade...
Definition: internal.h:47
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: options.c:237
seq_read_packet
static int seq_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: tiertexseq.c:254
AVCodecParameters::codec_type
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:58
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:374
AVCodecParameters::codec_tag
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: codec_par.h:66
AVProbeData::buf_size
int buf_size
Size of buf except extra allocated bytes.
Definition: avformat.h:456
seq_read_close
static int seq_read_close(AVFormatContext *s)
Definition: tiertexseq.c:185
AVChannelLayout::nb_channels
int nb_channels
Number of channels in this layout.
Definition: channel_layout.h:311
av_malloc
#define av_malloc(s)
Definition: tableprint_vlc.h:30
AVPROBE_SCORE_MAX
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:465
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:763
AV_CODEC_ID_PCM_S16BE
@ AV_CODEC_ID_PCM_S16BE
Definition: codec_id.h:327
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:143
ff_tiertexseq_demuxer
const AVInputFormat ff_tiertexseq_demuxer
Definition: tiertexseq.c:310
avio_rl16
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:745
SEQ_SAMPLE_RATE
#define SEQ_SAMPLE_RATE
Definition: tiertexseq.c:36
pkt
AVPacket * pkt
Definition: movenc.c:59
AVInputFormat
Definition: avformat.h:656
s
#define s(width, name)
Definition: cbs_vp9.c:256
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:97
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:661
AVProbeData::buf
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:455
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
AVCodecParameters::width
int width
Video only.
Definition: codec_par.h:128
SEQ_FRAME_SIZE
#define SEQ_FRAME_SIZE
Definition: tiertexseq.c:31
AV_CODEC_ID_TIERTEXSEQVIDEO
@ AV_CODEC_ID_TIERTEXSEQVIDEO
Definition: codec_id.h:147
SeqDemuxContext::audio_buffer_full
int audio_buffer_full
Definition: tiertexseq.c:59
AVFormatContext
Format I/O context.
Definition: avformat.h:1216
internal.h
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1108
read_header
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:540
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:453
AVCodecParameters::ch_layout
AVChannelLayout ch_layout
Audio only.
Definition: codec_par.h:213
AVCodecParameters::sample_rate
int sample_rate
Audio only.
Definition: codec_par.h:178
SeqDemuxContext::frame_buffers_count
int frame_buffers_count
Definition: tiertexseq.c:52
AVIOContext
Bytestream IO Context.
Definition: avio.h:166
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:115
AVChannelLayout
An AVChannelLayout holds information about the channel layout of audio data.
Definition: channel_layout.h:301
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:634
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:42
SeqDemuxContext::current_video_data_size
unsigned int current_video_data_size
Definition: tiertexseq.c:57
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:269
AVPacket::pts
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: packet.h:367
AVCodecParameters::height
int height
Definition: codec_par.h:129
AVCodecParameters::block_align
int block_align
Audio only.
Definition: codec_par.h:185
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:102
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:948
avio_seek
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:262
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:956
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:643
SeqDemuxContext::frame_buffers
TiertexSeqFrameBuffer frame_buffers[SEQ_NUM_FRAME_BUFFERS]
Definition: tiertexseq.c:51
AVPacket::stream_index
int stream_index
Definition: packet.h:376
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:104
AV_CHANNEL_LAYOUT_MONO
#define AV_CHANNEL_LAYOUT_MONO
Definition: channel_layout.h:368
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:62
AVPacket
This structure stores compressed data.
Definition: packet.h:351
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:34
SeqDemuxContext::current_audio_data_size
unsigned int current_audio_data_size
Definition: tiertexseq.c:53
AVCodecParameters::bit_rate
int64_t bit_rate
The average bitrate of the encoded data (in bits per second).
Definition: codec_par.h:91
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:61
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:988
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