store dts in ffm headers
[libav.git] / libavformat / ffmdec.c
CommitLineData
de6d9b64 1/*
85a6b01d 2 * FFM (ffserver live feed) demuxer
66d2ff2a 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
de6d9b64 22#include "avformat.h"
85a6b01d 23#include "ffm.h"
278f987a 24#ifdef CONFIG_FFSERVER
8be1c656 25#include <unistd.h>
de6d9b64 26
278f987a
BC
27offset_t ffm_read_write_index(int fd)
28{
29 uint8_t buf[8];
30
31 lseek(fd, 8, SEEK_SET);
32 read(fd, buf, 8);
33 return AV_RB64(buf);
34}
35
36void ffm_write_write_index(int fd, offset_t pos)
37{
38 uint8_t buf[8];
39 int i;
40
41 for(i=0;i<8;i++)
42 buf[i] = (pos >> (56 - i * 8)) & 0xff;
43 lseek(fd, 8, SEEK_SET);
44 write(fd, buf, 8);
45}
46
47void ffm_set_write_index(AVFormatContext *s, offset_t pos, offset_t file_size)
48{
49 FFMContext *ffm = s->priv_data;
50 ffm->write_index = pos;
51 ffm->file_size = file_size;
52}
53#endif // CONFIG_FFSERVER
54
de6d9b64
FB
55static int ffm_is_avail_data(AVFormatContext *s, int size)
56{
57 FFMContext *ffm = s->priv_data;
58 offset_t pos, avail_size;
59 int len;
60
61 len = ffm->packet_end - ffm->packet_ptr;
ba26712b
BC
62 if (size <= len)
63 return 1;
899681cd 64 pos = url_ftell(s->pb);
de6d9b64
FB
65 if (pos == ffm->write_index) {
66 /* exactly at the end of stream */
67 return 0;
68 } else if (pos < ffm->write_index) {
69 avail_size = ffm->write_index - pos;
70 } else {
71 avail_size = (ffm->file_size - pos) + (ffm->write_index - FFM_PACKET_SIZE);
72 }
73 avail_size = (avail_size / ffm->packet_size) * (ffm->packet_size - FFM_HEADER_SIZE) + len;
74 if (size <= avail_size)
75 return 1;
76 else
77 return 0;
78}
79
80/* first is true if we read the frame header */
4606ac8d 81static int ffm_read_data(AVFormatContext *s,
b30bb535 82 uint8_t *buf, int size, int header)
de6d9b64
FB
83{
84 FFMContext *ffm = s->priv_data;
899681cd 85 ByteIOContext *pb = s->pb;
de6d9b64
FB
86 int len, fill_size, size1, frame_offset;
87
88 size1 = size;
89 while (size > 0) {
90 redo:
91 len = ffm->packet_end - ffm->packet_ptr;
e5ece183
BC
92 if (len < 0)
93 return -1;
de6d9b64
FB
94 if (len > size)
95 len = size;
96 if (len == 0) {
97 if (url_ftell(pb) == ffm->file_size)
98 url_fseek(pb, ffm->packet_size, SEEK_SET);
5e57424d 99 retry_read:
de6d9b64
FB
100 get_be16(pb); /* PACKET_ID */
101 fill_size = get_be16(pb);
102 ffm->pts = get_be64(pb);
103 frame_offset = get_be16(pb);
104 get_buffer(pb, ffm->packet, ffm->packet_size - FFM_HEADER_SIZE);
105 ffm->packet_end = ffm->packet + (ffm->packet_size - FFM_HEADER_SIZE - fill_size);
eea2f032 106 if (ffm->packet_end < ffm->packet || frame_offset < 0)
71c32f19 107 return -1;
de6d9b64
FB
108 /* if first packet or resynchronization packet, we must
109 handle it specifically */
110 if (ffm->first_packet || (frame_offset & 0x8000)) {
5e57424d
PG
111 if (!frame_offset) {
112 /* This packet has no frame headers in it */
113 if (url_ftell(pb) >= ffm->packet_size * 3) {
114 url_fseek(pb, -ffm->packet_size * 2, SEEK_CUR);
115 goto retry_read;
116 }
117 /* This is bad, we cannot find a valid frame header */
118 return 0;
119 }
de6d9b64 120 ffm->first_packet = 0;
a077f3bc 121 if ((frame_offset & 0x7fff) < FFM_HEADER_SIZE)
71c32f19 122 return -1;
de6d9b64 123 ffm->packet_ptr = ffm->packet + (frame_offset & 0x7fff) - FFM_HEADER_SIZE;
b30bb535 124 if (!header)
de6d9b64
FB
125 break;
126 } else {
127 ffm->packet_ptr = ffm->packet;
128 }
129 goto redo;
130 }
131 memcpy(buf, ffm->packet_ptr, len);
132 buf += len;
133 ffm->packet_ptr += len;
134 size -= len;
b30bb535 135 header = 0;
de6d9b64
FB
136 }
137 return size1 - size;
138}
139
4adcbbbe
BC
140//#define DEBUG_SEEK
141
a1e01307
BC
142/* pos is between 0 and file_size - FFM_PACKET_SIZE. It is translated
143 by the write position inside this function */
144static void ffm_seek1(AVFormatContext *s, offset_t pos1)
145{
146 FFMContext *ffm = s->priv_data;
147 ByteIOContext *pb = s->pb;
148 offset_t pos;
149
150 pos = pos1 + ffm->write_index;
151 if (pos >= ffm->file_size)
152 pos -= (ffm->file_size - FFM_PACKET_SIZE);
153#ifdef DEBUG_SEEK
8999c833 154 av_log(s, AV_LOG_DEBUG, "seek to %"PRIx64" -> %"PRIx64"\n", pos1, pos);
a1e01307
BC
155#endif
156 url_fseek(pb, pos, SEEK_SET);
157}
158
979b1a06
BC
159static int64_t get_pts(AVFormatContext *s, offset_t pos)
160{
161 ByteIOContext *pb = s->pb;
162 int64_t pts;
163
164 ffm_seek1(s, pos);
165 url_fskip(pb, 4);
166 pts = get_be64(pb);
167#ifdef DEBUG_SEEK
8999c833 168 av_log(s, AV_LOG_DEBUG, "pts=%0.6f\n", pts / 1000000.0);
979b1a06
BC
169#endif
170 return pts;
171}
de6d9b64 172
91628427
PG
173static void adjust_write_index(AVFormatContext *s)
174{
175 FFMContext *ffm = s->priv_data;
899681cd 176 ByteIOContext *pb = s->pb;
91628427
PG
177 int64_t pts;
178 //offset_t orig_write_index = ffm->write_index;
179 offset_t pos_min, pos_max;
180 int64_t pts_start;
181 offset_t ptr = url_ftell(pb);
182
183
184 pos_min = 0;
185 pos_max = ffm->file_size - 2 * FFM_PACKET_SIZE;
186
187 pts_start = get_pts(s, pos_min);
188
189 pts = get_pts(s, pos_max);
190
115329f1 191 if (pts - 100000 > pts_start)
79292510 192 goto end;
91628427
PG
193
194 ffm->write_index = FFM_PACKET_SIZE;
195
196 pts_start = get_pts(s, pos_min);
197
198 pts = get_pts(s, pos_max);
199
200 if (pts - 100000 <= pts_start) {
201 while (1) {
202 offset_t newpos;
203 int64_t newpts;
204
205 newpos = ((pos_max + pos_min) / (2 * FFM_PACKET_SIZE)) * FFM_PACKET_SIZE;
206
207 if (newpos == pos_min)
208 break;
209
210 newpts = get_pts(s, newpos);
211
212 if (newpts - 100000 <= pts) {
213 pos_max = newpos;
214 pts = newpts;
215 } else {
216 pos_min = newpos;
217 }
218 }
219 ffm->write_index += pos_max;
220 }
221
949b1a13 222 //printf("Adjusted write index from %"PRId64" to %"PRId64": pts=%0.6f\n", orig_write_index, ffm->write_index, pts / 1000000.);
91628427
PG
223 //printf("pts range %0.6f - %0.6f\n", get_pts(s, 0) / 1000000. , get_pts(s, ffm->file_size - 2 * FFM_PACKET_SIZE) / 1000000. );
224
79292510 225 end:
91628427
PG
226 url_fseek(pb, ptr, SEEK_SET);
227}
228
229
de6d9b64
FB
230static int ffm_read_header(AVFormatContext *s, AVFormatParameters *ap)
231{
c9a65ca8 232 FFMContext *ffm = s->priv_data;
de6d9b64 233 AVStream *st;
899681cd 234 ByteIOContext *pb = s->pb;
de6d9b64 235 AVCodecContext *codec;
fa26a29d 236 int i, nb_streams;
0c1a9eda 237 uint32_t tag;
de6d9b64 238
de6d9b64
FB
239 /* header */
240 tag = get_le32(pb);
241 if (tag != MKTAG('F', 'F', 'M', '1'))
242 goto fail;
243 ffm->packet_size = get_be32(pb);
244 if (ffm->packet_size != FFM_PACKET_SIZE)
245 goto fail;
246 ffm->write_index = get_be64(pb);
247 /* get also filesize */
248 if (!url_is_streamed(pb)) {
a965c478 249 ffm->file_size = url_fsize(pb);
91628427 250 adjust_write_index(s);
de6d9b64 251 } else {
8da9266c 252 ffm->file_size = (UINT64_C(1) << 63) - 1;
de6d9b64
FB
253 }
254
fa26a29d 255 nb_streams = get_be32(pb);
de6d9b64
FB
256 get_be32(pb); /* total bitrate */
257 /* read each stream */
fa26a29d 258 for(i=0;i<nb_streams;i++) {
75bdb984
PG
259 char rc_eq_buf[128];
260
fa26a29d 261 st = av_new_stream(s, 0);
de6d9b64
FB
262 if (!st)
263 goto fail;
26aa0f89 264 s->streams[i] = st;
115329f1 265
e928649b 266 av_set_pts_info(st, 64, 1, 1000000);
115329f1 267
01f4895c 268 codec = st->codec;
de6d9b64 269 /* generic info */
26aa0f89
AB
270 codec->codec_id = get_be32(pb);
271 codec->codec_type = get_byte(pb); /* codec_type */
de6d9b64 272 codec->bit_rate = get_be32(pb);
26aa0f89 273 st->quality = get_be32(pb);
ccac2e27 274 codec->flags = get_be32(pb);
22332126
PG
275 codec->flags2 = get_be32(pb);
276 codec->debug = get_be32(pb);
de6d9b64
FB
277 /* specific info */
278 switch(codec->codec_type) {
279 case CODEC_TYPE_VIDEO:
c0df9d75
MN
280 codec->time_base.num = get_be32(pb);
281 codec->time_base.den = get_be32(pb);
de6d9b64
FB
282 codec->width = get_be16(pb);
283 codec->height = get_be16(pb);
20f01548 284 codec->gop_size = get_be16(pb);
22332126 285 codec->pix_fmt = get_be32(pb);
20f01548
PG
286 codec->qmin = get_byte(pb);
287 codec->qmax = get_byte(pb);
288 codec->max_qdiff = get_byte(pb);
289 codec->qcompress = get_be16(pb) / 10000.0;
290 codec->qblur = get_be16(pb) / 10000.0;
3884a3c3 291 codec->bit_rate_tolerance = get_be32(pb);
e9a9e0c2 292 codec->rc_eq = av_strdup(get_strz(pb, rc_eq_buf, sizeof(rc_eq_buf)));
75bdb984
PG
293 codec->rc_max_rate = get_be32(pb);
294 codec->rc_min_rate = get_be32(pb);
295 codec->rc_buffer_size = get_be32(pb);
7cb8f314
MN
296 codec->i_quant_factor = av_int2dbl(get_be64(pb));
297 codec->b_quant_factor = av_int2dbl(get_be64(pb));
298 codec->i_quant_offset = av_int2dbl(get_be64(pb));
299 codec->b_quant_offset = av_int2dbl(get_be64(pb));
75bdb984 300 codec->dct_algo = get_be32(pb);
22332126
PG
301 codec->strict_std_compliance = get_be32(pb);
302 codec->max_b_frames = get_be32(pb);
303 codec->luma_elim_threshold = get_be32(pb);
304 codec->chroma_elim_threshold = get_be32(pb);
305 codec->mpeg_quant = get_be32(pb);
306 codec->intra_dc_precision = get_be32(pb);
307 codec->me_method = get_be32(pb);
308 codec->mb_decision = get_be32(pb);
309 codec->nsse_weight = get_be32(pb);
310 codec->frame_skip_cmp = get_be32(pb);
7cb8f314 311 codec->rc_buffer_aggressivity = av_int2dbl(get_be64(pb));
038a1243 312 codec->codec_tag = get_be32(pb);
dbedf2aa 313 codec->thread_count = get_byte(pb);
de6d9b64
FB
314 break;
315 case CODEC_TYPE_AUDIO:
316 codec->sample_rate = get_be32(pb);
317 codec->channels = get_le16(pb);
20f01548 318 codec->frame_size = get_le16(pb);
de6d9b64 319 break;
20f01548 320 default:
75bdb984 321 goto fail;
de6d9b64 322 }
7080cbe2
BC
323 if (codec->flags & CODEC_FLAG_GLOBAL_HEADER) {
324 codec->extradata_size = get_be32(pb);
325 codec->extradata = av_malloc(codec->extradata_size);
326 if (!codec->extradata)
327 return AVERROR(ENOMEM);
328 get_buffer(pb, codec->extradata, codec->extradata_size);
329 }
de6d9b64
FB
330 }
331
332 /* get until end of block reached */
333 while ((url_ftell(pb) % ffm->packet_size) != 0)
334 get_byte(pb);
335
336 /* init packet demux */
337 ffm->packet_ptr = ffm->packet;
338 ffm->packet_end = ffm->packet;
339 ffm->frame_offset = 0;
340 ffm->pts = 0;
341 ffm->read_state = READ_HEADER;
342 ffm->first_packet = 1;
343 return 0;
344 fail:
345 for(i=0;i<s->nb_streams;i++) {
346 st = s->streams[i];
347 if (st) {
1ea4f593 348 av_free(st);
de6d9b64
FB
349 }
350 }
de6d9b64
FB
351 return -1;
352}
353
354/* return < 0 if eof */
355static int ffm_read_packet(AVFormatContext *s, AVPacket *pkt)
356{
357 int size;
358 FFMContext *ffm = s->priv_data;
20f01548 359 int duration;
de6d9b64
FB
360
361 switch(ffm->read_state) {
362 case READ_HEADER:
3c6a9f66 363 if (!ffm_is_avail_data(s, FRAME_HEADER_SIZE+4)) {
8fa36ae0 364 return AVERROR(EAGAIN);
66d2ff2a 365 }
ff978de4 366 dprintf(s, "pos=%08"PRIx64" spos=%"PRIx64", write_index=%"PRIx64" size=%"PRIx64"\n",
e785efc4 367 url_ftell(s->pb), s->pb->pos, ffm->write_index, ffm->file_size);
115329f1 368 if (ffm_read_data(s, ffm->header, FRAME_HEADER_SIZE, 1) !=
66d2ff2a 369 FRAME_HEADER_SIZE)
8fa36ae0 370 return AVERROR(EAGAIN);
3c6a9f66
BC
371 if (ffm->header[1] & FLAG_DTS)
372 if (ffm_read_data(s, ffm->header+16, 4, 1) != 4)
373 return AVERROR(EAGAIN);
de6d9b64 374#if 0
a299832f 375 av_hexdump_log(s, AV_LOG_DEBUG, ffm->header, FRAME_HEADER_SIZE);
de6d9b64
FB
376#endif
377 ffm->read_state = READ_DATA;
378 /* fall thru */
379 case READ_DATA:
80fb8234 380 size = AV_RB24(ffm->header + 2);
de6d9b64 381 if (!ffm_is_avail_data(s, size)) {
8fa36ae0 382 return AVERROR(EAGAIN);
de6d9b64
FB
383 }
384
80fb8234 385 duration = AV_RB24(ffm->header + 5);
20f01548 386
de6d9b64
FB
387 av_new_packet(pkt, size);
388 pkt->stream_index = ffm->header[0];
2ea2340e
BC
389 if ((unsigned)pkt->stream_index >= s->nb_streams) {
390 av_log(s, AV_LOG_ERROR, "invalid stream index %d\n", pkt->stream_index);
391 av_free_packet(pkt);
392 ffm->read_state = READ_HEADER;
393 return AVERROR(EAGAIN);
394 }
899681cd 395 pkt->pos = url_ftell(s->pb);
de6d9b64
FB
396 if (ffm->header[1] & FLAG_KEY_FRAME)
397 pkt->flags |= PKT_FLAG_KEY;
4606ac8d 398
de6d9b64
FB
399 ffm->read_state = READ_HEADER;
400 if (ffm_read_data(s, pkt->data, size, 0) != size) {
401 /* bad case: desynchronized packet. we cancel all the packet loading */
402 av_free_packet(pkt);
8fa36ae0 403 return AVERROR(EAGAIN);
de6d9b64 404 }
3c6a9f66
BC
405 pkt->pts = AV_RB64(ffm->header+8);
406 if (ffm->header[1] & FLAG_DTS)
407 pkt->dts = pkt->pts - AV_RB32(ffm->header+16);
408 else
409 pkt->dts = pkt->pts;
20f01548 410 pkt->duration = duration;
de6d9b64
FB
411 break;
412 }
413 return 0;
414}
415
de6d9b64 416/* seek to a given time in the file. The file read pointer is
aa6b38c2 417 positioned at or before pts. XXX: the following code is quite
de6d9b64 418 approximative */
7b3c1382 419static int ffm_seek(AVFormatContext *s, int stream_index, int64_t wanted_pts, int flags)
de6d9b64
FB
420{
421 FFMContext *ffm = s->priv_data;
422 offset_t pos_min, pos_max, pos;
0c1a9eda 423 int64_t pts_min, pts_max, pts;
de6d9b64
FB
424 double pos1;
425
426#ifdef DEBUG_SEEK
8999c833 427 av_log(s, AV_LOG_DEBUG, "wanted_pts=%0.6f\n", wanted_pts / 1000000.0);
de6d9b64
FB
428#endif
429 /* find the position using linear interpolation (better than
430 dichotomy in typical cases) */
431 pos_min = 0;
432 pos_max = ffm->file_size - 2 * FFM_PACKET_SIZE;
433 while (pos_min <= pos_max) {
434 pts_min = get_pts(s, pos_min);
435 pts_max = get_pts(s, pos_max);
436 /* linear interpolation */
4606ac8d 437 pos1 = (double)(pos_max - pos_min) * (double)(wanted_pts - pts_min) /
de6d9b64 438 (double)(pts_max - pts_min);
0c1a9eda 439 pos = (((int64_t)pos1) / FFM_PACKET_SIZE) * FFM_PACKET_SIZE;
de6d9b64
FB
440 if (pos <= pos_min)
441 pos = pos_min;
442 else if (pos >= pos_max)
443 pos = pos_max;
444 pts = get_pts(s, pos);
445 /* check if we are lucky */
446 if (pts == wanted_pts) {
447 goto found;
448 } else if (pts > wanted_pts) {
449 pos_max = pos - FFM_PACKET_SIZE;
450 } else {
451 pos_min = pos + FFM_PACKET_SIZE;
452 }
453 }
7b3c1382 454 pos = (flags & AVSEEK_FLAG_BACKWARD) ? pos_min : pos_max;
de6d9b64
FB
455 if (pos > 0)
456 pos -= FFM_PACKET_SIZE;
457 found:
458 ffm_seek1(s, pos);
c07d64c8
BC
459
460 /* reset read state */
461 ffm->read_state = READ_HEADER;
462 ffm->packet_ptr = ffm->packet;
463 ffm->packet_end = ffm->packet;
464 ffm->first_packet = 1;
465
de6d9b64
FB
466 return 0;
467}
468
07c4ed85
PG
469static int ffm_probe(AVProbeData *p)
470{
87e87886 471 if (
115329f1 472 p->buf[0] == 'F' && p->buf[1] == 'F' && p->buf[2] == 'M' &&
66d2ff2a 473 p->buf[3] == '1')
07c4ed85 474 return AVPROBE_SCORE_MAX + 1;
07c4ed85
PG
475 return 0;
476}
477
ff70e601 478AVInputFormat ffm_demuxer = {
c9a65ca8 479 "ffm",
bde15e74 480 NULL_IF_CONFIG_SMALL("ffm format"),
66d2ff2a 481 sizeof(FFMContext),
07c4ed85 482 ffm_probe,
c9a65ca8
FB
483 ffm_read_header,
484 ffm_read_packet,
9f5d3b13 485 NULL,
c9a65ca8 486 ffm_seek,
c9a65ca8 487};