2 * FFM (ffserver live feed) demuxer
3 * Copyright (c) 2001 Fabrice Bellard
5 * This file is part of FFmpeg.
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.
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.
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
24 #include "libavutil/intreadwrite.h"
25 #include "libavutil/intfloat.h"
26 #include "libavutil/opt.h"
27 #include "libavutil/avassert.h"
28 #include "libavutil/avstring.h"
32 #include "avio_internal.h"
34 static int ffm_is_avail_data(AVFormatContext *s, int size)
36 FFMContext *ffm = s->priv_data;
37 int64_t pos, avail_size;
40 len = ffm->packet_end - ffm->packet_ptr;
43 pos = avio_tell(s->pb);
44 if (!ffm->write_index) {
45 if (pos == ffm->file_size)
47 avail_size = ffm->file_size - pos;
49 if (pos == ffm->write_index) {
50 /* exactly at the end of stream */
51 return AVERROR(EAGAIN);
52 } else if (pos < ffm->write_index) {
53 avail_size = ffm->write_index - pos;
55 avail_size = (ffm->file_size - pos) + (ffm->write_index - FFM_PACKET_SIZE);
58 avail_size = (avail_size / ffm->packet_size) * (ffm->packet_size - FFM_HEADER_SIZE) + len;
59 if (size <= avail_size)
62 return AVERROR(EAGAIN);
65 static int ffm_resync(AVFormatContext *s, int state)
67 av_log(s, AV_LOG_ERROR, "resyncing\n");
68 while (state != PACKET_ID) {
69 if (avio_feof(s->pb)) {
70 av_log(s, AV_LOG_ERROR, "cannot find FFM syncword\n");
73 state = (state << 8) | avio_r8(s->pb);
78 /* first is true if we read the frame header */
79 static int ffm_read_data(AVFormatContext *s,
80 uint8_t *buf, int size, int header)
82 FFMContext *ffm = s->priv_data;
83 AVIOContext *pb = s->pb;
84 int len, fill_size, size1, frame_offset, id;
89 len = ffm->packet_end - ffm->packet_ptr;
95 if (avio_tell(pb) == ffm->file_size)
96 avio_seek(pb, ffm->packet_size, SEEK_SET);
98 if (pb->buffer_size != ffm->packet_size) {
99 int64_t tell = avio_tell(pb);
100 ffio_set_buf_size(pb, ffm->packet_size);
101 avio_seek(pb, tell, SEEK_SET);
103 id = avio_rb16(pb); /* PACKET_ID */
105 if (ffm_resync(s, id) < 0)
107 fill_size = avio_rb16(pb);
108 ffm->dts = avio_rb64(pb);
109 frame_offset = avio_rb16(pb);
110 avio_read(pb, ffm->packet, ffm->packet_size - FFM_HEADER_SIZE);
111 ffm->packet_end = ffm->packet + (ffm->packet_size - FFM_HEADER_SIZE - fill_size);
112 if (ffm->packet_end < ffm->packet || frame_offset < 0)
114 /* if first packet or resynchronization packet, we must
115 handle it specifically */
116 if (ffm->first_packet || (frame_offset & 0x8000)) {
118 /* This packet has no frame headers in it */
119 if (avio_tell(pb) >= ffm->packet_size * 3LL) {
120 avio_seek(pb, -ffm->packet_size * 2LL, SEEK_CUR);
123 /* This is bad, we cannot find a valid frame header */
126 ffm->first_packet = 0;
127 if ((frame_offset & 0x7fff) < FFM_HEADER_SIZE)
129 ffm->packet_ptr = ffm->packet + (frame_offset & 0x7fff) - FFM_HEADER_SIZE;
133 ffm->packet_ptr = ffm->packet;
137 memcpy(buf, ffm->packet_ptr, len);
139 ffm->packet_ptr += len;
146 /* ensure that acutal seeking happens between FFM_PACKET_SIZE
147 and file_size - FFM_PACKET_SIZE */
148 static int64_t ffm_seek1(AVFormatContext *s, int64_t pos1)
150 FFMContext *ffm = s->priv_data;
151 AVIOContext *pb = s->pb;
154 pos = FFMIN(pos1, ffm->file_size - FFM_PACKET_SIZE);
155 pos = FFMAX(pos, FFM_PACKET_SIZE);
156 av_dlog(s, "seek to %"PRIx64" -> %"PRIx64"\n", pos1, pos);
157 return avio_seek(pb, pos, SEEK_SET);
160 static int64_t get_dts(AVFormatContext *s, int64_t pos)
162 AVIOContext *pb = s->pb;
168 av_dlog(s, "dts=%0.6f\n", dts / 1000000.0);
172 static void adjust_write_index(AVFormatContext *s)
174 FFMContext *ffm = s->priv_data;
175 AVIOContext *pb = s->pb;
177 //int64_t orig_write_index = ffm->write_index;
178 int64_t pos_min, pos_max;
180 int64_t ptr = avio_tell(pb);
184 pos_max = ffm->file_size - 2 * FFM_PACKET_SIZE;
186 pts_start = get_dts(s, pos_min);
188 pts = get_dts(s, pos_max);
190 if (pts - 100000 > pts_start)
193 ffm->write_index = FFM_PACKET_SIZE;
195 pts_start = get_dts(s, pos_min);
197 pts = get_dts(s, pos_max);
199 if (pts - 100000 <= pts_start) {
204 newpos = ((pos_max + pos_min) / (2 * FFM_PACKET_SIZE)) * FFM_PACKET_SIZE;
206 if (newpos == pos_min)
209 newpts = get_dts(s, newpos);
211 if (newpts - 100000 <= pts) {
218 ffm->write_index += pos_max;
222 avio_seek(pb, ptr, SEEK_SET);
226 static int ffm_close(AVFormatContext *s)
230 for (i = 0; i < s->nb_streams; i++)
231 av_freep(&s->streams[i]->codec->rc_eq);
236 static int ffm_append_recommended_configuration(AVStream *st, char **conf)
240 av_assert0(conf && st);
243 if (!st->recommended_encoder_configuration) {
244 st->recommended_encoder_configuration = *conf;
248 newsize = strlen(*conf) + strlen(st->recommended_encoder_configuration) + 2;
249 if ((ret = av_reallocp(&st->recommended_encoder_configuration, newsize)) < 0)
251 av_strlcat(st->recommended_encoder_configuration, ",", newsize);
252 av_strlcat(st->recommended_encoder_configuration, *conf, newsize);
257 static int ffm2_read_header(AVFormatContext *s)
259 FFMContext *ffm = s->priv_data;
261 AVIOContext *pb = s->pb;
262 AVCodecContext *codec;
264 int f_main = 0, f_cprv, f_stvi, f_stau;
268 ffm->packet_size = avio_rb32(pb);
269 if (ffm->packet_size != FFM_PACKET_SIZE) {
270 av_log(s, AV_LOG_ERROR, "Invalid packet size %d, expected size was %d\n",
271 ffm->packet_size, FFM_PACKET_SIZE);
272 ret = AVERROR_INVALIDDATA;
276 ffm->write_index = avio_rb64(pb);
277 /* get also filesize */
279 ffm->file_size = avio_size(pb);
280 if (ffm->write_index && 0)
281 adjust_write_index(s);
283 ffm->file_size = (UINT64_C(1) << 63) - 1;
286 while(!avio_feof(pb)) {
287 unsigned id = avio_rb32(pb);
288 unsigned size = avio_rb32(pb);
289 int64_t next = avio_tell(pb) + size;
296 case MKBETAG('M', 'A', 'I', 'N'):
298 ret = AVERROR(EINVAL);
301 avio_rb32(pb); /* nb_streams */
302 avio_rb32(pb); /* total bitrate */
304 case MKBETAG('C', 'O', 'M', 'M'):
305 f_cprv = f_stvi = f_stau = 0;
306 st = avformat_new_stream(s, NULL);
308 ret = AVERROR(ENOMEM);
312 avpriv_set_pts_info(st, 64, 1, 1000000);
316 codec->codec_id = avio_rb32(pb);
317 codec->codec_type = avio_r8(pb);
318 codec->bit_rate = avio_rb32(pb);
319 codec->flags = avio_rb32(pb);
320 codec->flags2 = avio_rb32(pb);
321 codec->debug = avio_rb32(pb);
322 if (codec->flags & CODEC_FLAG_GLOBAL_HEADER) {
323 if (ff_get_extradata(codec, pb, avio_rb32(pb)) < 0)
324 return AVERROR(ENOMEM);
327 case MKBETAG('S', 'T', 'V', 'I'):
329 ret = AVERROR(EINVAL);
332 codec->time_base.num = avio_rb32(pb);
333 codec->time_base.den = avio_rb32(pb);
334 codec->width = avio_rb16(pb);
335 codec->height = avio_rb16(pb);
336 codec->gop_size = avio_rb16(pb);
337 codec->pix_fmt = avio_rb32(pb);
338 codec->qmin = avio_r8(pb);
339 codec->qmax = avio_r8(pb);
340 codec->max_qdiff = avio_r8(pb);
341 codec->qcompress = avio_rb16(pb) / 10000.0;
342 codec->qblur = avio_rb16(pb) / 10000.0;
343 codec->bit_rate_tolerance = avio_rb32(pb);
344 avio_get_str(pb, INT_MAX, rc_eq_buf, sizeof(rc_eq_buf));
345 codec->rc_eq = av_strdup(rc_eq_buf);
346 codec->rc_max_rate = avio_rb32(pb);
347 codec->rc_min_rate = avio_rb32(pb);
348 codec->rc_buffer_size = avio_rb32(pb);
349 codec->i_quant_factor = av_int2double(avio_rb64(pb));
350 codec->b_quant_factor = av_int2double(avio_rb64(pb));
351 codec->i_quant_offset = av_int2double(avio_rb64(pb));
352 codec->b_quant_offset = av_int2double(avio_rb64(pb));
353 codec->dct_algo = avio_rb32(pb);
354 codec->strict_std_compliance = avio_rb32(pb);
355 codec->max_b_frames = avio_rb32(pb);
356 codec->mpeg_quant = avio_rb32(pb);
357 codec->intra_dc_precision = avio_rb32(pb);
358 codec->me_method = avio_rb32(pb);
359 codec->mb_decision = avio_rb32(pb);
360 codec->nsse_weight = avio_rb32(pb);
361 codec->frame_skip_cmp = avio_rb32(pb);
362 codec->rc_buffer_aggressivity = av_int2double(avio_rb64(pb));
363 codec->codec_tag = avio_rb32(pb);
364 codec->thread_count = avio_r8(pb);
365 codec->coder_type = avio_rb32(pb);
366 codec->me_cmp = avio_rb32(pb);
367 codec->me_subpel_quality = avio_rb32(pb);
368 codec->me_range = avio_rb32(pb);
369 codec->keyint_min = avio_rb32(pb);
370 codec->scenechange_threshold = avio_rb32(pb);
371 codec->b_frame_strategy = avio_rb32(pb);
372 codec->qcompress = av_int2double(avio_rb64(pb));
373 codec->qblur = av_int2double(avio_rb64(pb));
374 codec->max_qdiff = avio_rb32(pb);
375 codec->refs = avio_rb32(pb);
377 case MKBETAG('S', 'T', 'A', 'U'):
379 ret = AVERROR(EINVAL);
382 codec->sample_rate = avio_rb32(pb);
383 codec->channels = avio_rl16(pb);
384 codec->frame_size = avio_rl16(pb);
386 case MKBETAG('C', 'P', 'R', 'V'):
388 ret = AVERROR(EINVAL);
391 enc = avcodec_find_encoder(codec->codec_id);
392 if (enc && enc->priv_data_size && enc->priv_class) {
393 buffer = av_malloc(size + 1);
395 ret = AVERROR(ENOMEM);
398 avio_get_str(pb, size, buffer, size + 1);
399 if ((ret = ffm_append_recommended_configuration(st, &buffer)) < 0)
403 case MKBETAG('S', '2', 'V', 'I'):
405 ret = AVERROR(EINVAL);
408 buffer = av_malloc(size);
410 ret = AVERROR(ENOMEM);
413 avio_get_str(pb, INT_MAX, buffer, size);
414 av_set_options_string(codec, buffer, "=", ",");
415 if ((ret = ffm_append_recommended_configuration(st, &buffer)) < 0)
418 case MKBETAG('S', '2', 'A', 'U'):
420 ret = AVERROR(EINVAL);
423 buffer = av_malloc(size);
425 ret = AVERROR(ENOMEM);
428 avio_get_str(pb, INT_MAX, buffer, size);
429 av_set_options_string(codec, buffer, "=", ",");
430 ffm_append_recommended_configuration(st, &buffer);
433 avio_seek(pb, next, SEEK_SET);
436 /* get until end of block reached */
437 while ((avio_tell(pb) % ffm->packet_size) != 0)
440 /* init packet demux */
441 ffm->packet_ptr = ffm->packet;
442 ffm->packet_end = ffm->packet;
443 ffm->frame_offset = 0;
445 ffm->read_state = READ_HEADER;
446 ffm->first_packet = 1;
453 static int ffm_read_header(AVFormatContext *s)
455 FFMContext *ffm = s->priv_data;
457 AVIOContext *pb = s->pb;
458 AVCodecContext *codec;
464 if (tag == MKTAG('F', 'F', 'M', '2'))
465 return ffm2_read_header(s);
466 if (tag != MKTAG('F', 'F', 'M', '1'))
468 ffm->packet_size = avio_rb32(pb);
469 if (ffm->packet_size != FFM_PACKET_SIZE)
471 ffm->write_index = avio_rb64(pb);
472 /* get also filesize */
474 ffm->file_size = avio_size(pb);
475 if (ffm->write_index && 0)
476 adjust_write_index(s);
478 ffm->file_size = (UINT64_C(1) << 63) - 1;
481 nb_streams = avio_rb32(pb);
482 avio_rb32(pb); /* total bitrate */
483 /* read each stream */
484 for(i=0;i<nb_streams;i++) {
487 st = avformat_new_stream(s, NULL);
491 avpriv_set_pts_info(st, 64, 1, 1000000);
495 codec->codec_id = avio_rb32(pb);
496 codec->codec_type = avio_r8(pb); /* codec_type */
497 codec->bit_rate = avio_rb32(pb);
498 codec->flags = avio_rb32(pb);
499 codec->flags2 = avio_rb32(pb);
500 codec->debug = avio_rb32(pb);
502 switch(codec->codec_type) {
503 case AVMEDIA_TYPE_VIDEO:
504 codec->time_base.num = avio_rb32(pb);
505 codec->time_base.den = avio_rb32(pb);
506 codec->width = avio_rb16(pb);
507 codec->height = avio_rb16(pb);
508 codec->gop_size = avio_rb16(pb);
509 codec->pix_fmt = avio_rb32(pb);
510 codec->qmin = avio_r8(pb);
511 codec->qmax = avio_r8(pb);
512 codec->max_qdiff = avio_r8(pb);
513 codec->qcompress = avio_rb16(pb) / 10000.0;
514 codec->qblur = avio_rb16(pb) / 10000.0;
515 codec->bit_rate_tolerance = avio_rb32(pb);
516 avio_get_str(pb, INT_MAX, rc_eq_buf, sizeof(rc_eq_buf));
517 codec->rc_eq = av_strdup(rc_eq_buf);
518 codec->rc_max_rate = avio_rb32(pb);
519 codec->rc_min_rate = avio_rb32(pb);
520 codec->rc_buffer_size = avio_rb32(pb);
521 codec->i_quant_factor = av_int2double(avio_rb64(pb));
522 codec->b_quant_factor = av_int2double(avio_rb64(pb));
523 codec->i_quant_offset = av_int2double(avio_rb64(pb));
524 codec->b_quant_offset = av_int2double(avio_rb64(pb));
525 codec->dct_algo = avio_rb32(pb);
526 codec->strict_std_compliance = avio_rb32(pb);
527 codec->max_b_frames = avio_rb32(pb);
528 codec->mpeg_quant = avio_rb32(pb);
529 codec->intra_dc_precision = avio_rb32(pb);
530 codec->me_method = avio_rb32(pb);
531 codec->mb_decision = avio_rb32(pb);
532 codec->nsse_weight = avio_rb32(pb);
533 codec->frame_skip_cmp = avio_rb32(pb);
534 codec->rc_buffer_aggressivity = av_int2double(avio_rb64(pb));
535 codec->codec_tag = avio_rb32(pb);
536 codec->thread_count = avio_r8(pb);
537 codec->coder_type = avio_rb32(pb);
538 codec->me_cmp = avio_rb32(pb);
539 codec->me_subpel_quality = avio_rb32(pb);
540 codec->me_range = avio_rb32(pb);
541 codec->keyint_min = avio_rb32(pb);
542 codec->scenechange_threshold = avio_rb32(pb);
543 codec->b_frame_strategy = avio_rb32(pb);
544 codec->qcompress = av_int2double(avio_rb64(pb));
545 codec->qblur = av_int2double(avio_rb64(pb));
546 codec->max_qdiff = avio_rb32(pb);
547 codec->refs = avio_rb32(pb);
549 case AVMEDIA_TYPE_AUDIO:
550 codec->sample_rate = avio_rb32(pb);
551 codec->channels = avio_rl16(pb);
552 codec->frame_size = avio_rl16(pb);
557 if (codec->flags & CODEC_FLAG_GLOBAL_HEADER) {
558 if (ff_get_extradata(codec, pb, avio_rb32(pb)) < 0)
559 return AVERROR(ENOMEM);
563 /* get until end of block reached */
564 while ((avio_tell(pb) % ffm->packet_size) != 0)
567 /* init packet demux */
568 ffm->packet_ptr = ffm->packet;
569 ffm->packet_end = ffm->packet;
570 ffm->frame_offset = 0;
572 ffm->read_state = READ_HEADER;
573 ffm->first_packet = 1;
580 /* return < 0 if eof */
581 static int ffm_read_packet(AVFormatContext *s, AVPacket *pkt)
584 FFMContext *ffm = s->priv_data;
587 switch(ffm->read_state) {
589 if ((ret = ffm_is_avail_data(s, FRAME_HEADER_SIZE+4)) < 0)
592 av_dlog(s, "pos=%08"PRIx64" spos=%"PRIx64", write_index=%"PRIx64" size=%"PRIx64"\n",
593 avio_tell(s->pb), s->pb->pos, ffm->write_index, ffm->file_size);
594 if (ffm_read_data(s, ffm->header, FRAME_HEADER_SIZE, 1) !=
597 if (ffm->header[1] & FLAG_DTS)
598 if (ffm_read_data(s, ffm->header+16, 4, 1) != 4)
600 ffm->read_state = READ_DATA;
603 size = AV_RB24(ffm->header + 2);
604 if ((ret = ffm_is_avail_data(s, size)) < 0)
607 duration = AV_RB24(ffm->header + 5);
609 if (av_new_packet(pkt, size) < 0) {
610 return AVERROR(ENOMEM);
612 pkt->stream_index = ffm->header[0];
613 if ((unsigned)pkt->stream_index >= s->nb_streams) {
614 av_log(s, AV_LOG_ERROR, "invalid stream index %d\n", pkt->stream_index);
616 ffm->read_state = READ_HEADER;
619 pkt->pos = avio_tell(s->pb);
620 if (ffm->header[1] & FLAG_KEY_FRAME)
621 pkt->flags |= AV_PKT_FLAG_KEY;
623 ffm->read_state = READ_HEADER;
624 if (ffm_read_data(s, pkt->data, size, 0) != size) {
625 /* bad case: desynchronized packet. we cancel all the packet loading */
629 pkt->pts = AV_RB64(ffm->header+8);
630 if (ffm->header[1] & FLAG_DTS)
631 pkt->dts = pkt->pts - AV_RB32(ffm->header+16);
634 pkt->duration = duration;
640 /* seek to a given time in the file. The file read pointer is
641 positioned at or before pts. XXX: the following code is quite
643 static int ffm_seek(AVFormatContext *s, int stream_index, int64_t wanted_pts, int flags)
645 FFMContext *ffm = s->priv_data;
646 int64_t pos_min, pos_max, pos;
647 int64_t pts_min, pts_max, pts;
650 av_dlog(s, "wanted_pts=%0.6f\n", wanted_pts / 1000000.0);
651 /* find the position using linear interpolation (better than
652 dichotomy in typical cases) */
653 if (ffm->write_index && ffm->write_index < ffm->file_size) {
654 if (get_dts(s, FFM_PACKET_SIZE) < wanted_pts) {
655 pos_min = FFM_PACKET_SIZE;
656 pos_max = ffm->write_index - FFM_PACKET_SIZE;
658 pos_min = ffm->write_index;
659 pos_max = ffm->file_size - FFM_PACKET_SIZE;
662 pos_min = FFM_PACKET_SIZE;
663 pos_max = ffm->file_size - FFM_PACKET_SIZE;
665 while (pos_min <= pos_max) {
666 pts_min = get_dts(s, pos_min);
667 pts_max = get_dts(s, pos_max);
668 if (pts_min > wanted_pts || pts_max <= wanted_pts) {
669 pos = pts_min > wanted_pts ? pos_min : pos_max;
672 /* linear interpolation */
673 pos1 = (double)(pos_max - pos_min) * (double)(wanted_pts - pts_min) /
674 (double)(pts_max - pts_min);
675 pos = (((int64_t)pos1) / FFM_PACKET_SIZE) * FFM_PACKET_SIZE;
678 else if (pos >= pos_max)
680 pts = get_dts(s, pos);
681 /* check if we are lucky */
682 if (pts == wanted_pts) {
684 } else if (pts > wanted_pts) {
685 pos_max = pos - FFM_PACKET_SIZE;
687 pos_min = pos + FFM_PACKET_SIZE;
690 pos = (flags & AVSEEK_FLAG_BACKWARD) ? pos_min : pos_max;
693 if (ffm_seek1(s, pos) < 0)
696 /* reset read state */
697 ffm->read_state = READ_HEADER;
698 ffm->packet_ptr = ffm->packet;
699 ffm->packet_end = ffm->packet;
700 ffm->first_packet = 1;
705 static int ffm_probe(AVProbeData *p)
708 p->buf[0] == 'F' && p->buf[1] == 'F' && p->buf[2] == 'M' &&
709 (p->buf[3] == '1' || p->buf[3] == '2'))
710 return AVPROBE_SCORE_MAX + 1;
714 AVInputFormat ff_ffm_demuxer = {
716 .long_name = NULL_IF_CONFIG_SMALL("FFM (FFserver live feed)"),
717 .priv_data_size = sizeof(FFMContext),
718 .read_probe = ffm_probe,
719 .read_header = ffm_read_header,
720 .read_packet = ffm_read_packet,
721 .read_close = ffm_close,
722 .read_seek = ffm_seek,