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) {
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:4896
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3960
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:4026
#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:4469
uint8_t * data
Definition: avcodec.h:1480
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:4062
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:650
int64_t bit_rate
The average bitrate of the encoded data (in bits per second).
Definition: avcodec.h:3989
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 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:3956
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:641
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:4077
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:4070
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:458
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:756
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:4002
int channels
Audio only.
Definition: avcodec.h:4066
#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:3964
int stream_index
Definition: avcodec.h:1482
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
#define AV_CH_LAYOUT_MONO
static int seq_read_header(AVFormatContext *s)
Definition: tiertexseq.c:196
This structure stores compressed data.
Definition: avcodec.h:1457
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:1473
static int seq_init_frame_buffers(SeqDemuxContext *seq, AVIOContext *pb)
Definition: tiertexseq.c:83
#define SEQ_FRAME_H
Definition: tiertexseq.c:33