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Imported Debian version 2.4.3~trusty1
[deb_ffmpeg.git] / ffmpeg / libavformat / ffmdec.c
CommitLineData
2ba45a60
DM		 1/*
2 * FFM (ffserver live feed) demuxer
3 * Copyright (c) 2001 Fabrice Bellard
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#include <stdint.h>
23
24#include "libavutil/intreadwrite.h"
25#include "libavutil/intfloat.h"
26#include "avformat.h"
27#include "internal.h"
28#include "ffm.h"
29#include "avio_internal.h"
30
31static int ffm_is_avail_data(AVFormatContext *s, int size)
32{
33 FFMContext *ffm = s->priv_data;
34 int64_t pos, avail_size;
35 int len;
36
37 len = ffm->packet_end - ffm->packet_ptr;
38 if (size <= len)
39 return 1;
40 pos = avio_tell(s->pb);
41 if (!ffm->write_index) {
42 if (pos == ffm->file_size)
43 return AVERROR_EOF;
44 avail_size = ffm->file_size - pos;
45 } else {
46 if (pos == ffm->write_index) {
47 /* exactly at the end of stream */
48 return AVERROR(EAGAIN);
49 } else if (pos < ffm->write_index) {
50 avail_size = ffm->write_index - pos;
51 } else {
52 avail_size = (ffm->file_size - pos) + (ffm->write_index - FFM_PACKET_SIZE);
53 }
54 }
55 avail_size = (avail_size / ffm->packet_size) * (ffm->packet_size - FFM_HEADER_SIZE) + len;
56 if (size <= avail_size)
57 return 1;
58 else
59 return AVERROR(EAGAIN);
60}
61
62static int ffm_resync(AVFormatContext *s, int state)
63{
64 av_log(s, AV_LOG_ERROR, "resyncing\n");
65 while (state != PACKET_ID) {
66 if (avio_feof(s->pb)) {
67 av_log(s, AV_LOG_ERROR, "cannot find FFM syncword\n");
68 return -1;
69 }
70 state = (state << 8) | avio_r8(s->pb);
71 }
72 return 0;
73}
74
75/* first is true if we read the frame header */
76static int ffm_read_data(AVFormatContext *s,
77 uint8_t *buf, int size, int header)
78{
79 FFMContext *ffm = s->priv_data;
80 AVIOContext *pb = s->pb;
81 int len, fill_size, size1, frame_offset, id;
82
83 size1 = size;
84 while (size > 0) {
85 redo:
86 len = ffm->packet_end - ffm->packet_ptr;
87 if (len < 0)
88 return -1;
89 if (len > size)
90 len = size;
91 if (len == 0) {
92 if (avio_tell(pb) == ffm->file_size)
93 avio_seek(pb, ffm->packet_size, SEEK_SET);
94 retry_read:
95 if (pb->buffer_size != ffm->packet_size) {
96 int64_t tell = avio_tell(pb);
97 ffio_set_buf_size(pb, ffm->packet_size);
98 avio_seek(pb, tell, SEEK_SET);
99 }
100 id = avio_rb16(pb); /* PACKET_ID */
101 if (id != PACKET_ID)
102 if (ffm_resync(s, id) < 0)
103 return -1;
104 fill_size = avio_rb16(pb);
105 ffm->dts = avio_rb64(pb);
106 frame_offset = avio_rb16(pb);
107 avio_read(pb, ffm->packet, ffm->packet_size - FFM_HEADER_SIZE);
108 ffm->packet_end = ffm->packet + (ffm->packet_size - FFM_HEADER_SIZE - fill_size);
109 if (ffm->packet_end < ffm->packet || frame_offset < 0)
110 return -1;
111 /* if first packet or resynchronization packet, we must
112 handle it specifically */
113 if (ffm->first_packet || (frame_offset & 0x8000)) {
114 if (!frame_offset) {
115 /* This packet has no frame headers in it */
116 if (avio_tell(pb) >= ffm->packet_size * 3LL) {
117 avio_seek(pb, -ffm->packet_size * 2LL, SEEK_CUR);
118 goto retry_read;
119 }
120 /* This is bad, we cannot find a valid frame header */
121 return 0;
122 }
123 ffm->first_packet = 0;
124 if ((frame_offset & 0x7fff) < FFM_HEADER_SIZE)
125 return -1;
126 ffm->packet_ptr = ffm->packet + (frame_offset & 0x7fff) - FFM_HEADER_SIZE;
127 if (!header)
128 break;
129 } else {
130 ffm->packet_ptr = ffm->packet;
131 }
132 goto redo;
133 }
134 memcpy(buf, ffm->packet_ptr, len);
135 buf += len;
136 ffm->packet_ptr += len;
137 size -= len;
138 header = 0;
139 }
140 return size1 - size;
141}
142
143/* ensure that acutal seeking happens between FFM_PACKET_SIZE
144 and file_size - FFM_PACKET_SIZE */
145static int64_t ffm_seek1(AVFormatContext *s, int64_t pos1)
146{
147 FFMContext *ffm = s->priv_data;
148 AVIOContext *pb = s->pb;
149 int64_t pos;
150
151 pos = FFMIN(pos1, ffm->file_size - FFM_PACKET_SIZE);
152 pos = FFMAX(pos, FFM_PACKET_SIZE);
153 av_dlog(s, "seek to %"PRIx64" -> %"PRIx64"\n", pos1, pos);
154 return avio_seek(pb, pos, SEEK_SET);
155}
156
157static int64_t get_dts(AVFormatContext *s, int64_t pos)
158{
159 AVIOContext *pb = s->pb;
160 int64_t dts;
161
162 ffm_seek1(s, pos);
163 avio_skip(pb, 4);
164 dts = avio_rb64(pb);
165 av_dlog(s, "dts=%0.6f\n", dts / 1000000.0);
166 return dts;
167}
168
169static void adjust_write_index(AVFormatContext *s)
170{
171 FFMContext *ffm = s->priv_data;
172 AVIOContext *pb = s->pb;
173 int64_t pts;
174 //int64_t orig_write_index = ffm->write_index;
175 int64_t pos_min, pos_max;
176 int64_t pts_start;
177 int64_t ptr = avio_tell(pb);
178
179
180 pos_min = 0;
181 pos_max = ffm->file_size - 2 * FFM_PACKET_SIZE;
182
183 pts_start = get_dts(s, pos_min);
184
185 pts = get_dts(s, pos_max);
186
187 if (pts - 100000 > pts_start)
188 goto end;
189
190 ffm->write_index = FFM_PACKET_SIZE;
191
192 pts_start = get_dts(s, pos_min);
193
194 pts = get_dts(s, pos_max);
195
196 if (pts - 100000 <= pts_start) {
197 while (1) {
198 int64_t newpos;
199 int64_t newpts;
200
201 newpos = ((pos_max + pos_min) / (2 * FFM_PACKET_SIZE)) * FFM_PACKET_SIZE;
202
203 if (newpos == pos_min)
204 break;
205
206 newpts = get_dts(s, newpos);
207
208 if (newpts - 100000 <= pts) {
209 pos_max = newpos;
210 pts = newpts;
211 } else {
212 pos_min = newpos;
213 }
214 }
215 ffm->write_index += pos_max;
216 }
217
218 end:
219 avio_seek(pb, ptr, SEEK_SET);
220}
221
222
223static int ffm_close(AVFormatContext *s)
224{
225 int i;
226
227 for (i = 0; i < s->nb_streams; i++)
228 av_freep(&s->streams[i]->codec->rc_eq);
229
230 return 0;
231}
232
233static int ffm2_read_header(AVFormatContext *s)
234{
235 FFMContext *ffm = s->priv_data;
236 AVStream *st;
237 AVIOContext *pb = s->pb;
238 AVCodecContext *codec;
239 int ret;
240
241 ffm->packet_size = avio_rb32(pb);
242 if (ffm->packet_size != FFM_PACKET_SIZE) {
243 av_log(s, AV_LOG_ERROR, "Invalid packet size %d, expected size was %d\n",
244 ffm->packet_size, FFM_PACKET_SIZE);
245 ret = AVERROR_INVALIDDATA;
246 goto fail;
247 }
248
249 ffm->write_index = avio_rb64(pb);
250 /* get also filesize */
251 if (pb->seekable) {
252 ffm->file_size = avio_size(pb);
253 if (ffm->write_index && 0)
254 adjust_write_index(s);
255 } else {
256 ffm->file_size = (UINT64_C(1) << 63) - 1;
257 }
258
259 while(!avio_feof(pb)) {
260 unsigned id = avio_rb32(pb);
261 unsigned size = avio_rb32(pb);
262 int64_t next = avio_tell(pb) + size;
263 char rc_eq_buf[128];
264
265 if(!id)
266 break;
267
268 switch(id) {
269 case MKBETAG('M', 'A', 'I', 'N'):
270 avio_rb32(pb); /* nb_streams */
271 avio_rb32(pb); /* total bitrate */
272 break;
273 case MKBETAG('C', 'O', 'M', 'M'):
274 st = avformat_new_stream(s, NULL);
275 if (!st) {
276 ret = AVERROR(ENOMEM);
277 goto fail;
278 }
279
280 avpriv_set_pts_info(st, 64, 1, 1000000);
281
282 codec = st->codec;
283 /* generic info */
284 codec->codec_id = avio_rb32(pb);
285 codec->codec_type = avio_r8(pb);
286 codec->bit_rate = avio_rb32(pb);
287 codec->flags = avio_rb32(pb);
288 codec->flags2 = avio_rb32(pb);
289 codec->debug = avio_rb32(pb);
290 if (codec->flags & CODEC_FLAG_GLOBAL_HEADER) {
291 if (ff_get_extradata(codec, pb, avio_rb32(pb)) < 0)
292 return AVERROR(ENOMEM);
293 }
294 avio_seek(pb, next, SEEK_SET);
295 id = avio_rb32(pb);
296 size = avio_rb32(pb);
297 next = avio_tell(pb) + size;
298 switch(id) {
299 case MKBETAG('S', 'T', 'V', 'I'):
300 codec->time_base.num = avio_rb32(pb);
301 codec->time_base.den = avio_rb32(pb);
302 codec->width = avio_rb16(pb);
303 codec->height = avio_rb16(pb);
304 codec->gop_size = avio_rb16(pb);
305 codec->pix_fmt = avio_rb32(pb);
306 codec->qmin = avio_r8(pb);
307 codec->qmax = avio_r8(pb);
308 codec->max_qdiff = avio_r8(pb);
309 codec->qcompress = avio_rb16(pb) / 10000.0;
310 codec->qblur = avio_rb16(pb) / 10000.0;
311 codec->bit_rate_tolerance = avio_rb32(pb);
312 avio_get_str(pb, INT_MAX, rc_eq_buf, sizeof(rc_eq_buf));
313 codec->rc_eq = av_strdup(rc_eq_buf);
314 codec->rc_max_rate = avio_rb32(pb);
315 codec->rc_min_rate = avio_rb32(pb);
316 codec->rc_buffer_size = avio_rb32(pb);
317 codec->i_quant_factor = av_int2double(avio_rb64(pb));
318 codec->b_quant_factor = av_int2double(avio_rb64(pb));
319 codec->i_quant_offset = av_int2double(avio_rb64(pb));
320 codec->b_quant_offset = av_int2double(avio_rb64(pb));
321 codec->dct_algo = avio_rb32(pb);
322 codec->strict_std_compliance = avio_rb32(pb);
323 codec->max_b_frames = avio_rb32(pb);
324 codec->mpeg_quant = avio_rb32(pb);
325 codec->intra_dc_precision = avio_rb32(pb);
326 codec->me_method = avio_rb32(pb);
327 codec->mb_decision = avio_rb32(pb);
328 codec->nsse_weight = avio_rb32(pb);
329 codec->frame_skip_cmp = avio_rb32(pb);
330 codec->rc_buffer_aggressivity = av_int2double(avio_rb64(pb));
331 codec->codec_tag = avio_rb32(pb);
332 codec->thread_count = avio_r8(pb);
333 codec->coder_type = avio_rb32(pb);
334 codec->me_cmp = avio_rb32(pb);
335 codec->me_subpel_quality = avio_rb32(pb);
336 codec->me_range = avio_rb32(pb);
337 codec->keyint_min = avio_rb32(pb);
338 codec->scenechange_threshold = avio_rb32(pb);
339 codec->b_frame_strategy = avio_rb32(pb);
340 codec->qcompress = av_int2double(avio_rb64(pb));
341 codec->qblur = av_int2double(avio_rb64(pb));
342 codec->max_qdiff = avio_rb32(pb);
343 codec->refs = avio_rb32(pb);
344 break;
345 case MKBETAG('S', 'T', 'A', 'U'):
346 codec->sample_rate = avio_rb32(pb);
347 codec->channels = avio_rl16(pb);
348 codec->frame_size = avio_rl16(pb);
349 break;
350 }
351 break;
352 }
353 avio_seek(pb, next, SEEK_SET);
354 }
355
356 /* get until end of block reached */
357 while ((avio_tell(pb) % ffm->packet_size) != 0)
358 avio_r8(pb);
359
360 /* init packet demux */
361 ffm->packet_ptr = ffm->packet;
362 ffm->packet_end = ffm->packet;
363 ffm->frame_offset = 0;
364 ffm->dts = 0;
365 ffm->read_state = READ_HEADER;
366 ffm->first_packet = 1;
367 return 0;
368 fail:
369 ffm_close(s);
370 return ret;
371}
372
373static int ffm_read_header(AVFormatContext *s)
374{
375 FFMContext *ffm = s->priv_data;
376 AVStream *st;
377 AVIOContext *pb = s->pb;
378 AVCodecContext *codec;
379 int i, nb_streams;
380 uint32_t tag;
381
382 /* header */
383 tag = avio_rl32(pb);
384 if (tag == MKTAG('F', 'F', 'M', '2'))
385 return ffm2_read_header(s);
386 if (tag != MKTAG('F', 'F', 'M', '1'))
387 goto fail;
388 ffm->packet_size = avio_rb32(pb);
389 if (ffm->packet_size != FFM_PACKET_SIZE)
390 goto fail;
391 ffm->write_index = avio_rb64(pb);
392 /* get also filesize */
393 if (pb->seekable) {
394 ffm->file_size = avio_size(pb);
395 if (ffm->write_index && 0)
396 adjust_write_index(s);
397 } else {
398 ffm->file_size = (UINT64_C(1) << 63) - 1;
399 }
400
401 nb_streams = avio_rb32(pb);
402 avio_rb32(pb); /* total bitrate */
403 /* read each stream */
404 for(i=0;i<nb_streams;i++) {
405 char rc_eq_buf[128];
406
407 st = avformat_new_stream(s, NULL);
408 if (!st)
409 goto fail;
410
411 avpriv_set_pts_info(st, 64, 1, 1000000);
412
413 codec = st->codec;
414 /* generic info */
415 codec->codec_id = avio_rb32(pb);
416 codec->codec_type = avio_r8(pb); /* codec_type */
417 codec->bit_rate = avio_rb32(pb);
418 codec->flags = avio_rb32(pb);
419 codec->flags2 = avio_rb32(pb);
420 codec->debug = avio_rb32(pb);
421 /* specific info */
422 switch(codec->codec_type) {
423 case AVMEDIA_TYPE_VIDEO:
424 codec->time_base.num = avio_rb32(pb);
425 codec->time_base.den = avio_rb32(pb);
426 codec->width = avio_rb16(pb);
427 codec->height = avio_rb16(pb);
428 codec->gop_size = avio_rb16(pb);
429 codec->pix_fmt = avio_rb32(pb);
430 codec->qmin = avio_r8(pb);
431 codec->qmax = avio_r8(pb);
432 codec->max_qdiff = avio_r8(pb);
433 codec->qcompress = avio_rb16(pb) / 10000.0;
434 codec->qblur = avio_rb16(pb) / 10000.0;
435 codec->bit_rate_tolerance = avio_rb32(pb);
436 avio_get_str(pb, INT_MAX, rc_eq_buf, sizeof(rc_eq_buf));
437 codec->rc_eq = av_strdup(rc_eq_buf);
438 codec->rc_max_rate = avio_rb32(pb);
439 codec->rc_min_rate = avio_rb32(pb);
440 codec->rc_buffer_size = avio_rb32(pb);
441 codec->i_quant_factor = av_int2double(avio_rb64(pb));
442 codec->b_quant_factor = av_int2double(avio_rb64(pb));
443 codec->i_quant_offset = av_int2double(avio_rb64(pb));
444 codec->b_quant_offset = av_int2double(avio_rb64(pb));
445 codec->dct_algo = avio_rb32(pb);
446 codec->strict_std_compliance = avio_rb32(pb);
447 codec->max_b_frames = avio_rb32(pb);
448 codec->mpeg_quant = avio_rb32(pb);
449 codec->intra_dc_precision = avio_rb32(pb);
450 codec->me_method = avio_rb32(pb);
451 codec->mb_decision = avio_rb32(pb);
452 codec->nsse_weight = avio_rb32(pb);
453 codec->frame_skip_cmp = avio_rb32(pb);
454 codec->rc_buffer_aggressivity = av_int2double(avio_rb64(pb));
455 codec->codec_tag = avio_rb32(pb);
456 codec->thread_count = avio_r8(pb);
457 codec->coder_type = avio_rb32(pb);
458 codec->me_cmp = avio_rb32(pb);
459 codec->me_subpel_quality = avio_rb32(pb);
460 codec->me_range = avio_rb32(pb);
461 codec->keyint_min = avio_rb32(pb);
462 codec->scenechange_threshold = avio_rb32(pb);
463 codec->b_frame_strategy = avio_rb32(pb);
464 codec->qcompress = av_int2double(avio_rb64(pb));
465 codec->qblur = av_int2double(avio_rb64(pb));
466 codec->max_qdiff = avio_rb32(pb);
467 codec->refs = avio_rb32(pb);
468 break;
469 case AVMEDIA_TYPE_AUDIO:
470 codec->sample_rate = avio_rb32(pb);
471 codec->channels = avio_rl16(pb);
472 codec->frame_size = avio_rl16(pb);
473 break;
474 default:
475 goto fail;
476 }
477 if (codec->flags & CODEC_FLAG_GLOBAL_HEADER) {
478 if (ff_get_extradata(codec, pb, avio_rb32(pb)) < 0)
479 return AVERROR(ENOMEM);
480 }
481 }
482
483 /* get until end of block reached */
484 while ((avio_tell(pb) % ffm->packet_size) != 0)
485 avio_r8(pb);
486
487 /* init packet demux */
488 ffm->packet_ptr = ffm->packet;
489 ffm->packet_end = ffm->packet;
490 ffm->frame_offset = 0;
491 ffm->dts = 0;
492 ffm->read_state = READ_HEADER;
493 ffm->first_packet = 1;
494 return 0;
495 fail:
496 ffm_close(s);
497 return -1;
498}
499
500/* return < 0 if eof */
501static int ffm_read_packet(AVFormatContext *s, AVPacket *pkt)
502{
503 int size;
504 FFMContext *ffm = s->priv_data;
505 int duration, ret;
506
507 switch(ffm->read_state) {
508 case READ_HEADER:
509 if ((ret = ffm_is_avail_data(s, FRAME_HEADER_SIZE+4)) < 0)
510 return ret;
511
512 av_dlog(s, "pos=%08"PRIx64" spos=%"PRIx64", write_index=%"PRIx64" size=%"PRIx64"\n",
513 avio_tell(s->pb), s->pb->pos, ffm->write_index, ffm->file_size);
514 if (ffm_read_data(s, ffm->header, FRAME_HEADER_SIZE, 1) !=
515 FRAME_HEADER_SIZE)
516 return -1;
517 if (ffm->header[1] & FLAG_DTS)
518 if (ffm_read_data(s, ffm->header+16, 4, 1) != 4)
519 return -1;
520 ffm->read_state = READ_DATA;
521 /* fall through */
522 case READ_DATA:
523 size = AV_RB24(ffm->header + 2);
524 if ((ret = ffm_is_avail_data(s, size)) < 0)
525 return ret;
526
527 duration = AV_RB24(ffm->header + 5);
528
529 if (av_new_packet(pkt, size) < 0) {
530 return AVERROR(ENOMEM);
531 }
532 pkt->stream_index = ffm->header[0];
533 if ((unsigned)pkt->stream_index >= s->nb_streams) {
534 av_log(s, AV_LOG_ERROR, "invalid stream index %d\n", pkt->stream_index);
535 av_free_packet(pkt);
536 ffm->read_state = READ_HEADER;
537 return -1;
538 }
539 pkt->pos = avio_tell(s->pb);
540 if (ffm->header[1] & FLAG_KEY_FRAME)
541 pkt->flags |= AV_PKT_FLAG_KEY;
542
543 ffm->read_state = READ_HEADER;
544 if (ffm_read_data(s, pkt->data, size, 0) != size) {
545 /* bad case: desynchronized packet. we cancel all the packet loading */
546 av_free_packet(pkt);
547 return -1;
548 }
549 pkt->pts = AV_RB64(ffm->header+8);
550 if (ffm->header[1] & FLAG_DTS)
551 pkt->dts = pkt->pts - AV_RB32(ffm->header+16);
552 else
553 pkt->dts = pkt->pts;
554 pkt->duration = duration;
555 break;
556 }
557 return 0;
558}
559
560/* seek to a given time in the file. The file read pointer is
561 positioned at or before pts. XXX: the following code is quite
562 approximative */
563static int ffm_seek(AVFormatContext *s, int stream_index, int64_t wanted_pts, int flags)
564{
565 FFMContext *ffm = s->priv_data;
566 int64_t pos_min, pos_max, pos;
567 int64_t pts_min, pts_max, pts;
568 double pos1;
569
570 av_dlog(s, "wanted_pts=%0.6f\n", wanted_pts / 1000000.0);
571 /* find the position using linear interpolation (better than
572 dichotomy in typical cases) */
573 if (ffm->write_index && ffm->write_index < ffm->file_size) {
574 if (get_dts(s, FFM_PACKET_SIZE) < wanted_pts) {
575 pos_min = FFM_PACKET_SIZE;
576 pos_max = ffm->write_index - FFM_PACKET_SIZE;
577 } else {
578 pos_min = ffm->write_index;
579 pos_max = ffm->file_size - FFM_PACKET_SIZE;
580 }
581 } else {
582 pos_min = FFM_PACKET_SIZE;
583 pos_max = ffm->file_size - FFM_PACKET_SIZE;
584 }
585 while (pos_min <= pos_max) {
586 pts_min = get_dts(s, pos_min);
587 pts_max = get_dts(s, pos_max);
588 if (pts_min > wanted_pts || pts_max <= wanted_pts) {
589 pos = pts_min > wanted_pts ? pos_min : pos_max;
590 goto found;
591 }
592 /* linear interpolation */
593 pos1 = (double)(pos_max - pos_min) * (double)(wanted_pts - pts_min) /
594 (double)(pts_max - pts_min);
595 pos = (((int64_t)pos1) / FFM_PACKET_SIZE) * FFM_PACKET_SIZE;
596 if (pos <= pos_min)
597 pos = pos_min;
598 else if (pos >= pos_max)
599 pos = pos_max;
600 pts = get_dts(s, pos);
601 /* check if we are lucky */
602 if (pts == wanted_pts) {
603 goto found;
604 } else if (pts > wanted_pts) {
605 pos_max = pos - FFM_PACKET_SIZE;
606 } else {
607 pos_min = pos + FFM_PACKET_SIZE;
608 }
609 }
610 pos = (flags & AVSEEK_FLAG_BACKWARD) ? pos_min : pos_max;
611
612 found:
613 if (ffm_seek1(s, pos) < 0)
614 return -1;
615
616 /* reset read state */
617 ffm->read_state = READ_HEADER;
618 ffm->packet_ptr = ffm->packet;
619 ffm->packet_end = ffm->packet;
620 ffm->first_packet = 1;
621
622 return 0;
623}
624
625static int ffm_probe(AVProbeData *p)
626{
627 if (
628 p->buf[0] == 'F' && p->buf[1] == 'F' && p->buf[2] == 'M' &&
629 (p->buf[3] == '1' || p->buf[3] == '2'))
630 return AVPROBE_SCORE_MAX + 1;
631 return 0;
632}
633
634AVInputFormat ff_ffm_demuxer = {
635 .name = "ffm",
636 .long_name = NULL_IF_CONFIG_SMALL("FFM (FFserver live feed)"),
637 .priv_data_size = sizeof(FFMContext),
638 .read_probe = ffm_probe,
639 .read_header = ffm_read_header,
640 .read_packet = ffm_read_packet,
641 .read_close = ffm_close,
642 .read_seek = ffm_seek,
643};
ffmpeg Piment Noir Debian package repository