FFmpeg  4.2.3
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) {
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  return AVERROR(ENOMEM);
278 
279  pkt->data[0] = 0;
280  if (seq->current_pal_data_size) {
281  pkt->data[0] |= 1;
282  avio_seek(pb, seq->current_frame_offs + seq->current_pal_data_offs, SEEK_SET);
283  if (avio_read(pb, &pkt->data[1], seq->current_pal_data_size) != seq->current_pal_data_size)
284  return AVERROR(EIO);
285  }
286  if (seq->current_video_data_size) {
287  pkt->data[0] |= 2;
288  memcpy(&pkt->data[1 + seq->current_pal_data_size],
291  }
292  pkt->stream_index = seq->video_stream_index;
293  pkt->pts = seq->current_frame_pts;
294 
295  /* sound buffer will be processed on next read_packet() call */
296  seq->audio_buffer_full = 1;
297  return 0;
298  }
299  }
300 
301  /* audio packet */
302  if (seq->current_audio_data_offs == 0) /* end of data reached */
303  return AVERROR(EIO);
304 
305  avio_seek(pb, seq->current_frame_offs + seq->current_audio_data_offs, SEEK_SET);
306  rc = av_get_packet(pb, pkt, seq->current_audio_data_size);
307  if (rc < 0)
308  return rc;
309 
310  pkt->stream_index = seq->audio_stream_index;
311  seq->current_frame_pts++;
312 
313  seq->audio_buffer_full = 0;
314  return 0;
315 }
316 
318  .name = "tiertexseq",
319  .long_name = NULL_IF_CONFIG_SMALL("Tiertex Limited SEQ"),
320  .priv_data_size = sizeof(SeqDemuxContext),
325 };
unsigned int current_audio_data_size
Definition: tiertexseq.c:53
#define NULL
Definition: coverity.c:32
Bytestream IO Context.
Definition: avio.h:161
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
AVInputFormat ff_tiertexseq_demuxer
Definition: tiertexseq.c:317
int audio_buffer_full
Definition: tiertexseq.c:59
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:4903
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3957
int index
stream index in AVFormatContext
Definition: avformat.h:882
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:246
#define SEQ_AUDIO_BUFFER_SIZE
Definition: tiertexseq.c:35
static AVPacket pkt
unsigned int current_audio_data_offs
Definition: tiertexseq.c:54
Format I/O context.
Definition: avformat.h:1358
int video_stream_index
Definition: tiertexseq.c:48
#define av_malloc(s)
int width
Video only.
Definition: avcodec.h:4023
#define SEQ_FRAME_W
Definition: tiertexseq.c:32
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4476
uint8_t * data
Definition: avcodec.h:1477
static av_cold int read_close(AVFormatContext *ctx)
Definition: libcdio.c:145
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
unsigned int current_pal_data_size
Definition: tiertexseq.c:55
uint64_t channel_layout
Audio only.
Definition: avcodec.h:4059
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:647
int64_t bit_rate
The average bitrate of the encoded data (in bits per second).
Definition: avcodec.h:3986
static int seq_parse_frame_data(SeqDemuxContext *seq, AVIOContext *pb)
Definition: tiertexseq.c:126
int av_new_packet(AVPacket *pkt, int size)
Allocate the payload of a packet and initialize its fields with default values.
Definition: avpacket.c:86
#define SEQ_NUM_FRAME_BUFFERS
Definition: tiertexseq.c:34
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:259
static int seq_fill_buffer(SeqDemuxContext *seq, AVIOContext *pb, int buffer_num, unsigned int data_offs, int data_size)
Definition: tiertexseq.c:107
int current_frame_offs
Definition: tiertexseq.c:50
#define AVERROR(e)
Definition: error.h:43
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:3953
static int seq_probe(const AVProbeData *p)
Definition: tiertexseq.c:63
static int seq_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: tiertexseq.c:263
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:638
int buf_size
Size of buf except extra allocated bytes.
Definition: avformat.h:449
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:448
int block_align
Audio only.
Definition: avcodec.h:4074
int current_frame_pts
Definition: tiertexseq.c:49
int frame_buffers_count
Definition: tiertexseq.c:52
audio channel layout utility functions
unsigned int current_pal_data_offs
Definition: tiertexseq.c:56
unsigned char * current_video_data_ptr
Definition: tiertexseq.c:58
#define s(width, name)
Definition: cbs_vp9.c:257
TiertexSeqFrameBuffer frame_buffers[SEQ_NUM_FRAME_BUFFERS]
Definition: tiertexseq.c:51
#define SEQ_FRAME_RATE
Definition: tiertexseq.c:37
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:530
Stream structure.
Definition: avformat.h:881
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
AVIOContext * pb
I/O context.
Definition: avformat.h:1400
static int seq_read_close(AVFormatContext *s)
Definition: tiertexseq.c:185
unsigned int current_video_data_size
Definition: tiertexseq.c:57
int audio_stream_index
Definition: tiertexseq.c:47
This structure contains the data a format has to probe a file.
Definition: avformat.h:446
static int read_probe(const AVProbeData *pd)
Definition: jvdec.c:55
int sample_rate
Audio only.
Definition: avcodec.h:4067
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:458
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:753
Main libavformat public API header.
unsigned char * data
Definition: tiertexseq.c:43
#define SEQ_SAMPLE_RATE
Definition: tiertexseq.c:36
int64_t start_time
Decoding: pts of the first frame of the stream in presentation order, in stream time base...
Definition: avformat.h:920
static const uint8_t offset_table[]
Definition: escape130.c:41
void * priv_data
Format private data.
Definition: avformat.h:1386
#define SEQ_FRAME_SIZE
Definition: tiertexseq.c:31
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: avcodec.h:3999
int channels
Audio only.
Definition: avcodec.h:4063
#define av_freep(p)
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:654
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1028
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: avcodec.h:3961
int stream_index
Definition: avcodec.h:1479
#define AV_CH_LAYOUT_MONO
static int seq_read_header(AVFormatContext *s)
Definition: tiertexseq.c:196
This structure stores compressed data.
Definition: avcodec.h:1454
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:1470
static int seq_init_frame_buffers(SeqDemuxContext *seq, AVIOContext *pb)
Definition: tiertexseq.c:83
#define SEQ_FRAME_H
Definition: tiertexseq.c:33