resync ffm if error in stream
[libav.git] / libavformat / ffmdec.c
CommitLineData
de6d9b64 1/*
85a6b01d 2 * FFM (ffserver live feed) demuxer
406792e7 3 * Copyright (c) 2001 Fabrice Bellard
de6d9b64 4 *
b78e7197
DB
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
66d2ff2a
FB
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
b78e7197 10 * version 2.1 of the License, or (at your option) any later version.
de6d9b64 11 *
b78e7197 12 * FFmpeg is distributed in the hope that it will be useful,
de6d9b64 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
66d2ff2a
FB
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
de6d9b64 16 *
66d2ff2a 17 * You should have received a copy of the GNU Lesser General Public
b78e7197 18 * License along with FFmpeg; if not, write to the Free Software
5509bffa 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
de6d9b64 20 */
85a6b01d 21
6a5d31ac 22#include "libavutil/intreadwrite.h"
de6d9b64 23#include "avformat.h"
85a6b01d 24#include "ffm.h"
b250f9c6 25#if CONFIG_FFSERVER
8be1c656 26#include <unistd.h>
de6d9b64 27
bc5c918e 28int64_t ffm_read_write_index(int fd)
278f987a
BC
29{
30 uint8_t buf[8];
31
32 lseek(fd, 8, SEEK_SET);
2dc91884
BC
33 if (read(fd, buf, 8) != 8)
34 return AVERROR(EIO);
278f987a
BC
35 return AV_RB64(buf);
36}
37
6fcce4f9 38int ffm_write_write_index(int fd, int64_t pos)
278f987a
BC
39{
40 uint8_t buf[8];
41 int i;
42
43 for(i=0;i<8;i++)
44 buf[i] = (pos >> (56 - i * 8)) & 0xff;
45 lseek(fd, 8, SEEK_SET);
6fcce4f9
PK
46 if (write(fd, buf, 8) != 8)
47 return AVERROR(EIO);
48 return 8;
278f987a
BC
49}
50
bc5c918e 51void ffm_set_write_index(AVFormatContext *s, int64_t pos, int64_t file_size)
278f987a
BC
52{
53 FFMContext *ffm = s->priv_data;
54 ffm->write_index = pos;
55 ffm->file_size = file_size;
56}
57#endif // CONFIG_FFSERVER
58
de6d9b64
FB
59static int ffm_is_avail_data(AVFormatContext *s, int size)
60{
61 FFMContext *ffm = s->priv_data;
bc5c918e 62 int64_t pos, avail_size;
de6d9b64
FB
63 int len;
64
65 len = ffm->packet_end - ffm->packet_ptr;
ba26712b
BC
66 if (size <= len)
67 return 1;
899681cd 68 pos = url_ftell(s->pb);
b9edbe99 69 if (!ffm->write_index) {
21c6438f 70 if (pos == ffm->file_size)
b9edbe99
BC
71 return AVERROR_EOF;
72 avail_size = ffm->file_size - pos;
73 } else {
de6d9b64
FB
74 if (pos == ffm->write_index) {
75 /* exactly at the end of stream */
b9edbe99 76 return AVERROR(EAGAIN);
de6d9b64
FB
77 } else if (pos < ffm->write_index) {
78 avail_size = ffm->write_index - pos;
79 } else {
80 avail_size = (ffm->file_size - pos) + (ffm->write_index - FFM_PACKET_SIZE);
81 }
b9edbe99 82 }
de6d9b64
FB
83 avail_size = (avail_size / ffm->packet_size) * (ffm->packet_size - FFM_HEADER_SIZE) + len;
84 if (size <= avail_size)
85 return 1;
86 else
b9edbe99 87 return AVERROR(EAGAIN);
de6d9b64
FB
88}
89
7c45723a
BC
90static int ffm_resync(AVFormatContext *s, int state)
91{
92 av_log(s, AV_LOG_ERROR, "resyncing\n");
93 while (state != PACKET_ID) {
94 if (url_feof(s->pb)) {
95 av_log(s, AV_LOG_ERROR, "cannot find FFM syncword\n");
96 return -1;
97 }
98 state = (state << 8) | get_byte(s->pb);
99 }
100 return 0;
101}
102
de6d9b64 103/* first is true if we read the frame header */
4606ac8d 104static int ffm_read_data(AVFormatContext *s,
b30bb535 105 uint8_t *buf, int size, int header)
de6d9b64
FB
106{
107 FFMContext *ffm = s->priv_data;
899681cd 108 ByteIOContext *pb = s->pb;
7c45723a 109 int len, fill_size, size1, frame_offset, id;
de6d9b64
FB
110
111 size1 = size;
112 while (size > 0) {
113 redo:
114 len = ffm->packet_end - ffm->packet_ptr;
e5ece183
BC
115 if (len < 0)
116 return -1;
de6d9b64
FB
117 if (len > size)
118 len = size;
119 if (len == 0) {
120 if (url_ftell(pb) == ffm->file_size)
121 url_fseek(pb, ffm->packet_size, SEEK_SET);
5e57424d 122 retry_read:
7c45723a
BC
123 id = get_be16(pb); /* PACKET_ID */
124 if (id != PACKET_ID)
125 if (ffm_resync(s, id) < 0)
126 return -1;
de6d9b64 127 fill_size = get_be16(pb);
fabb990e 128 ffm->dts = get_be64(pb);
de6d9b64
FB
129 frame_offset = get_be16(pb);
130 get_buffer(pb, ffm->packet, ffm->packet_size - FFM_HEADER_SIZE);
131 ffm->packet_end = ffm->packet + (ffm->packet_size - FFM_HEADER_SIZE - fill_size);
eea2f032 132 if (ffm->packet_end < ffm->packet || frame_offset < 0)
71c32f19 133 return -1;
de6d9b64
FB
134 /* if first packet or resynchronization packet, we must
135 handle it specifically */
136 if (ffm->first_packet || (frame_offset & 0x8000)) {
5e57424d
PG
137 if (!frame_offset) {
138 /* This packet has no frame headers in it */
139 if (url_ftell(pb) >= ffm->packet_size * 3) {
140 url_fseek(pb, -ffm->packet_size * 2, SEEK_CUR);
141 goto retry_read;
142 }
143 /* This is bad, we cannot find a valid frame header */
144 return 0;
145 }
de6d9b64 146 ffm->first_packet = 0;
a077f3bc 147 if ((frame_offset & 0x7fff) < FFM_HEADER_SIZE)
71c32f19 148 return -1;
de6d9b64 149 ffm->packet_ptr = ffm->packet + (frame_offset & 0x7fff) - FFM_HEADER_SIZE;
b30bb535 150 if (!header)
de6d9b64
FB
151 break;
152 } else {
153 ffm->packet_ptr = ffm->packet;
154 }
155 goto redo;
156 }
157 memcpy(buf, ffm->packet_ptr, len);
158 buf += len;
159 ffm->packet_ptr += len;
160 size -= len;
b30bb535 161 header = 0;
de6d9b64
FB
162 }
163 return size1 - size;
164}
165
4adcbbbe
BC
166//#define DEBUG_SEEK
167
a1e01307
BC
168/* pos is between 0 and file_size - FFM_PACKET_SIZE. It is translated
169 by the write position inside this function */
bc5c918e 170static void ffm_seek1(AVFormatContext *s, int64_t pos1)
a1e01307
BC
171{
172 FFMContext *ffm = s->priv_data;
173 ByteIOContext *pb = s->pb;
bc5c918e 174 int64_t pos;
a1e01307
BC
175
176 pos = pos1 + ffm->write_index;
177 if (pos >= ffm->file_size)
178 pos -= (ffm->file_size - FFM_PACKET_SIZE);
179#ifdef DEBUG_SEEK
8999c833 180 av_log(s, AV_LOG_DEBUG, "seek to %"PRIx64" -> %"PRIx64"\n", pos1, pos);
a1e01307
BC
181#endif
182 url_fseek(pb, pos, SEEK_SET);
183}
184
bc5c918e 185static int64_t get_dts(AVFormatContext *s, int64_t pos)
979b1a06
BC
186{
187 ByteIOContext *pb = s->pb;
fabb990e 188 int64_t dts;
979b1a06
BC
189
190 ffm_seek1(s, pos);
191 url_fskip(pb, 4);
fabb990e 192 dts = get_be64(pb);
979b1a06 193#ifdef DEBUG_SEEK
8999c833 194 av_log(s, AV_LOG_DEBUG, "pts=%0.6f\n", pts / 1000000.0);
979b1a06 195#endif
fabb990e 196 return dts;
979b1a06 197}
de6d9b64 198
91628427
PG
199static void adjust_write_index(AVFormatContext *s)
200{
201 FFMContext *ffm = s->priv_data;
899681cd 202 ByteIOContext *pb = s->pb;
91628427 203 int64_t pts;
bc5c918e
DB
204 //int64_t orig_write_index = ffm->write_index;
205 int64_t pos_min, pos_max;
91628427 206 int64_t pts_start;
bc5c918e 207 int64_t ptr = url_ftell(pb);
91628427
PG
208
209
210 pos_min = 0;
211 pos_max = ffm->file_size - 2 * FFM_PACKET_SIZE;
212
fabb990e 213 pts_start = get_dts(s, pos_min);
91628427 214
fabb990e 215 pts = get_dts(s, pos_max);
91628427 216
115329f1 217 if (pts - 100000 > pts_start)
79292510 218 goto end;
91628427
PG
219
220 ffm->write_index = FFM_PACKET_SIZE;
221
fabb990e 222 pts_start = get_dts(s, pos_min);
91628427 223
fabb990e 224 pts = get_dts(s, pos_max);
91628427
PG
225
226 if (pts - 100000 <= pts_start) {
227 while (1) {
bc5c918e 228 int64_t newpos;
91628427
PG
229 int64_t newpts;
230
231 newpos = ((pos_max + pos_min) / (2 * FFM_PACKET_SIZE)) * FFM_PACKET_SIZE;
232
233 if (newpos == pos_min)
234 break;
235
fabb990e 236 newpts = get_dts(s, newpos);
91628427
PG
237
238 if (newpts - 100000 <= pts) {
239 pos_max = newpos;
240 pts = newpts;
241 } else {
242 pos_min = newpos;
243 }
244 }
245 ffm->write_index += pos_max;
246 }
247
949b1a13 248 //printf("Adjusted write index from %"PRId64" to %"PRId64": pts=%0.6f\n", orig_write_index, ffm->write_index, pts / 1000000.);
fabb990e 249 //printf("pts range %0.6f - %0.6f\n", get_dts(s, 0) / 1000000. , get_dts(s, ffm->file_size - 2 * FFM_PACKET_SIZE) / 1000000. );
91628427 250
79292510 251 end:
91628427
PG
252 url_fseek(pb, ptr, SEEK_SET);
253}
254
255
de6d9b64
FB
256static int ffm_read_header(AVFormatContext *s, AVFormatParameters *ap)
257{
c9a65ca8 258 FFMContext *ffm = s->priv_data;
de6d9b64 259 AVStream *st;
899681cd 260 ByteIOContext *pb = s->pb;
de6d9b64 261 AVCodecContext *codec;
fa26a29d 262 int i, nb_streams;
0c1a9eda 263 uint32_t tag;
de6d9b64 264
de6d9b64
FB
265 /* header */
266 tag = get_le32(pb);
267 if (tag != MKTAG('F', 'F', 'M', '1'))
268 goto fail;
269 ffm->packet_size = get_be32(pb);
270 if (ffm->packet_size != FFM_PACKET_SIZE)
271 goto fail;
272 ffm->write_index = get_be64(pb);
273 /* get also filesize */
274 if (!url_is_streamed(pb)) {
a965c478 275 ffm->file_size = url_fsize(pb);
b9edbe99
BC
276 if (ffm->write_index)
277 adjust_write_index(s);
de6d9b64 278 } else {
8da9266c 279 ffm->file_size = (UINT64_C(1) << 63) - 1;
de6d9b64
FB
280 }
281
fa26a29d 282 nb_streams = get_be32(pb);
de6d9b64
FB
283 get_be32(pb); /* total bitrate */
284 /* read each stream */
fa26a29d 285 for(i=0;i<nb_streams;i++) {
75bdb984
PG
286 char rc_eq_buf[128];
287
fa26a29d 288 st = av_new_stream(s, 0);
de6d9b64
FB
289 if (!st)
290 goto fail;
26aa0f89 291 s->streams[i] = st;
115329f1 292
e928649b 293 av_set_pts_info(st, 64, 1, 1000000);
115329f1 294
01f4895c 295 codec = st->codec;
de6d9b64 296 /* generic info */
26aa0f89
AB
297 codec->codec_id = get_be32(pb);
298 codec->codec_type = get_byte(pb); /* codec_type */
de6d9b64 299 codec->bit_rate = get_be32(pb);
26aa0f89 300 st->quality = get_be32(pb);
ccac2e27 301 codec->flags = get_be32(pb);
22332126
PG
302 codec->flags2 = get_be32(pb);
303 codec->debug = get_be32(pb);
de6d9b64
FB
304 /* specific info */
305 switch(codec->codec_type) {
306 case CODEC_TYPE_VIDEO:
c0df9d75
MN
307 codec->time_base.num = get_be32(pb);
308 codec->time_base.den = get_be32(pb);
de6d9b64
FB
309 codec->width = get_be16(pb);
310 codec->height = get_be16(pb);
20f01548 311 codec->gop_size = get_be16(pb);
22332126 312 codec->pix_fmt = get_be32(pb);
20f01548
PG
313 codec->qmin = get_byte(pb);
314 codec->qmax = get_byte(pb);
315 codec->max_qdiff = get_byte(pb);
316 codec->qcompress = get_be16(pb) / 10000.0;
317 codec->qblur = get_be16(pb) / 10000.0;
3884a3c3 318 codec->bit_rate_tolerance = get_be32(pb);
e9a9e0c2 319 codec->rc_eq = av_strdup(get_strz(pb, rc_eq_buf, sizeof(rc_eq_buf)));
75bdb984
PG
320 codec->rc_max_rate = get_be32(pb);
321 codec->rc_min_rate = get_be32(pb);
322 codec->rc_buffer_size = get_be32(pb);
7cb8f314
MN
323 codec->i_quant_factor = av_int2dbl(get_be64(pb));
324 codec->b_quant_factor = av_int2dbl(get_be64(pb));
325 codec->i_quant_offset = av_int2dbl(get_be64(pb));
326 codec->b_quant_offset = av_int2dbl(get_be64(pb));
75bdb984 327 codec->dct_algo = get_be32(pb);
22332126
PG
328 codec->strict_std_compliance = get_be32(pb);
329 codec->max_b_frames = get_be32(pb);
330 codec->luma_elim_threshold = get_be32(pb);
331 codec->chroma_elim_threshold = get_be32(pb);
332 codec->mpeg_quant = get_be32(pb);
333 codec->intra_dc_precision = get_be32(pb);
334 codec->me_method = get_be32(pb);
335 codec->mb_decision = get_be32(pb);
336 codec->nsse_weight = get_be32(pb);
337 codec->frame_skip_cmp = get_be32(pb);
7cb8f314 338 codec->rc_buffer_aggressivity = av_int2dbl(get_be64(pb));
038a1243 339 codec->codec_tag = get_be32(pb);
dbedf2aa 340 codec->thread_count = get_byte(pb);
de6d9b64
FB
341 break;
342 case CODEC_TYPE_AUDIO:
343 codec->sample_rate = get_be32(pb);
344 codec->channels = get_le16(pb);
20f01548 345 codec->frame_size = get_le16(pb);
de6d9b64 346 break;
20f01548 347 default:
75bdb984 348 goto fail;
de6d9b64 349 }
7080cbe2
BC
350 if (codec->flags & CODEC_FLAG_GLOBAL_HEADER) {
351 codec->extradata_size = get_be32(pb);
352 codec->extradata = av_malloc(codec->extradata_size);
353 if (!codec->extradata)
354 return AVERROR(ENOMEM);
355 get_buffer(pb, codec->extradata, codec->extradata_size);
356 }
de6d9b64
FB
357 }
358
359 /* get until end of block reached */
360 while ((url_ftell(pb) % ffm->packet_size) != 0)
361 get_byte(pb);
362
363 /* init packet demux */
364 ffm->packet_ptr = ffm->packet;
365 ffm->packet_end = ffm->packet;
366 ffm->frame_offset = 0;
fabb990e 367 ffm->dts = 0;
de6d9b64
FB
368 ffm->read_state = READ_HEADER;
369 ffm->first_packet = 1;
370 return 0;
371 fail:
372 for(i=0;i<s->nb_streams;i++) {
373 st = s->streams[i];
374 if (st) {
1ea4f593 375 av_free(st);
de6d9b64
FB
376 }
377 }
de6d9b64
FB
378 return -1;
379}
380
381/* return < 0 if eof */
382static int ffm_read_packet(AVFormatContext *s, AVPacket *pkt)
383{
384 int size;
385 FFMContext *ffm = s->priv_data;
b9edbe99 386 int duration, ret;
eee99eb3 387
de6d9b64
FB
388 switch(ffm->read_state) {
389 case READ_HEADER:
b9edbe99
BC
390 if ((ret = ffm_is_avail_data(s, FRAME_HEADER_SIZE+4)) < 0)
391 return ret;
392
ff978de4 393 dprintf(s, "pos=%08"PRIx64" spos=%"PRIx64", write_index=%"PRIx64" size=%"PRIx64"\n",
e785efc4 394 url_ftell(s->pb), s->pb->pos, ffm->write_index, ffm->file_size);
115329f1 395 if (ffm_read_data(s, ffm->header, FRAME_HEADER_SIZE, 1) !=
66d2ff2a 396 FRAME_HEADER_SIZE)
b9edbe99 397 return -1;
3c6a9f66
BC
398 if (ffm->header[1] & FLAG_DTS)
399 if (ffm_read_data(s, ffm->header+16, 4, 1) != 4)
b9edbe99 400 return -1;
de6d9b64 401#if 0
a299832f 402 av_hexdump_log(s, AV_LOG_DEBUG, ffm->header, FRAME_HEADER_SIZE);
de6d9b64
FB
403#endif
404 ffm->read_state = READ_DATA;
405 /* fall thru */
406 case READ_DATA:
80fb8234 407 size = AV_RB24(ffm->header + 2);
b9edbe99
BC
408 if ((ret = ffm_is_avail_data(s, size)) < 0)
409 return ret;
de6d9b64 410
80fb8234 411 duration = AV_RB24(ffm->header + 5);
20f01548 412
de6d9b64
FB
413 av_new_packet(pkt, size);
414 pkt->stream_index = ffm->header[0];
2ea2340e
BC
415 if ((unsigned)pkt->stream_index >= s->nb_streams) {
416 av_log(s, AV_LOG_ERROR, "invalid stream index %d\n", pkt->stream_index);
417 av_free_packet(pkt);
418 ffm->read_state = READ_HEADER;
b9edbe99 419 return -1;
2ea2340e 420 }
899681cd 421 pkt->pos = url_ftell(s->pb);
de6d9b64
FB
422 if (ffm->header[1] & FLAG_KEY_FRAME)
423 pkt->flags |= PKT_FLAG_KEY;
4606ac8d 424
de6d9b64
FB
425 ffm->read_state = READ_HEADER;
426 if (ffm_read_data(s, pkt->data, size, 0) != size) {
427 /* bad case: desynchronized packet. we cancel all the packet loading */
428 av_free_packet(pkt);
b9edbe99 429 return -1;
de6d9b64 430 }
3c6a9f66
BC
431 pkt->pts = AV_RB64(ffm->header+8);
432 if (ffm->header[1] & FLAG_DTS)
433 pkt->dts = pkt->pts - AV_RB32(ffm->header+16);
434 else
435 pkt->dts = pkt->pts;
20f01548 436 pkt->duration = duration;
de6d9b64
FB
437 break;
438 }
439 return 0;
440}
441
de6d9b64 442/* seek to a given time in the file. The file read pointer is
aa6b38c2 443 positioned at or before pts. XXX: the following code is quite
de6d9b64 444 approximative */
7b3c1382 445static int ffm_seek(AVFormatContext *s, int stream_index, int64_t wanted_pts, int flags)
de6d9b64
FB
446{
447 FFMContext *ffm = s->priv_data;
bc5c918e 448 int64_t pos_min, pos_max, pos;
0c1a9eda 449 int64_t pts_min, pts_max, pts;
de6d9b64
FB
450 double pos1;
451
452#ifdef DEBUG_SEEK
8999c833 453 av_log(s, AV_LOG_DEBUG, "wanted_pts=%0.6f\n", wanted_pts / 1000000.0);
de6d9b64
FB
454#endif
455 /* find the position using linear interpolation (better than
456 dichotomy in typical cases) */
457 pos_min = 0;
458 pos_max = ffm->file_size - 2 * FFM_PACKET_SIZE;
459 while (pos_min <= pos_max) {
fabb990e
BC
460 pts_min = get_dts(s, pos_min);
461 pts_max = get_dts(s, pos_max);
de6d9b64 462 /* linear interpolation */
4606ac8d 463 pos1 = (double)(pos_max - pos_min) * (double)(wanted_pts - pts_min) /
de6d9b64 464 (double)(pts_max - pts_min);
0c1a9eda 465 pos = (((int64_t)pos1) / FFM_PACKET_SIZE) * FFM_PACKET_SIZE;
de6d9b64
FB
466 if (pos <= pos_min)
467 pos = pos_min;
468 else if (pos >= pos_max)
469 pos = pos_max;
fabb990e 470 pts = get_dts(s, pos);
de6d9b64
FB
471 /* check if we are lucky */
472 if (pts == wanted_pts) {
473 goto found;
474 } else if (pts > wanted_pts) {
475 pos_max = pos - FFM_PACKET_SIZE;
476 } else {
477 pos_min = pos + FFM_PACKET_SIZE;
478 }
479 }
7b3c1382 480 pos = (flags & AVSEEK_FLAG_BACKWARD) ? pos_min : pos_max;
de6d9b64
FB
481 if (pos > 0)
482 pos -= FFM_PACKET_SIZE;
483 found:
484 ffm_seek1(s, pos);
c07d64c8
BC
485
486 /* reset read state */
487 ffm->read_state = READ_HEADER;
488 ffm->packet_ptr = ffm->packet;
489 ffm->packet_end = ffm->packet;
490 ffm->first_packet = 1;
491
de6d9b64
FB
492 return 0;
493}
494
07c4ed85
PG
495static int ffm_probe(AVProbeData *p)
496{
87e87886 497 if (
115329f1 498 p->buf[0] == 'F' && p->buf[1] == 'F' && p->buf[2] == 'M' &&
66d2ff2a 499 p->buf[3] == '1')
07c4ed85 500 return AVPROBE_SCORE_MAX + 1;
07c4ed85
PG
501 return 0;
502}
503
ff70e601 504AVInputFormat ffm_demuxer = {
c9a65ca8 505 "ffm",
af274fd1 506 NULL_IF_CONFIG_SMALL("FFM (FFserver live feed) format"),
66d2ff2a 507 sizeof(FFMContext),
07c4ed85 508 ffm_probe,
c9a65ca8
FB
509 ffm_read_header,
510 ffm_read_packet,
9f5d3b13 511 NULL,
c9a65ca8 512 ffm_seek,
c9a65ca8 513};