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"
30 #include "avio_internal.h"
32 static int ffm_is_avail_data(AVFormatContext *s, int size)
34 FFMContext *ffm = s->priv_data;
35 int64_t pos, avail_size;
38 len = ffm->packet_end - ffm->packet_ptr;
41 pos = avio_tell(s->pb);
42 if (!ffm->write_index) {
43 if (pos == ffm->file_size)
45 avail_size = ffm->file_size - pos;
47 if (pos == ffm->write_index) {
48 /* exactly at the end of stream */
49 return AVERROR(EAGAIN);
50 } else if (pos < ffm->write_index) {
51 avail_size = ffm->write_index - pos;
53 avail_size = (ffm->file_size - pos) + (ffm->write_index - FFM_PACKET_SIZE);
56 avail_size = (avail_size / ffm->packet_size) * (ffm->packet_size - FFM_HEADER_SIZE) + len;
57 if (size <= avail_size)
60 return AVERROR(EAGAIN);
63 static int ffm_resync(AVFormatContext *s, int state)
65 av_log(s, AV_LOG_ERROR, "resyncing\n");
66 while (state != PACKET_ID) {
67 if (avio_feof(s->pb)) {
68 av_log(s, AV_LOG_ERROR, "cannot find FFM syncword\n");
71 state = (state << 8) | avio_r8(s->pb);
76 /* first is true if we read the frame header */
77 static int ffm_read_data(AVFormatContext *s,
78 uint8_t *buf, int size, int header)
80 FFMContext *ffm = s->priv_data;
81 AVIOContext *pb = s->pb;
82 int len, fill_size, size1, frame_offset, id;
87 len = ffm->packet_end - ffm->packet_ptr;
93 if (avio_tell(pb) == ffm->file_size)
94 avio_seek(pb, ffm->packet_size, SEEK_SET);
96 if (pb->buffer_size != ffm->packet_size) {
97 int64_t tell = avio_tell(pb);
98 ffio_set_buf_size(pb, ffm->packet_size);
99 avio_seek(pb, tell, SEEK_SET);
101 id = avio_rb16(pb); /* PACKET_ID */
103 if (ffm_resync(s, id) < 0)
105 fill_size = avio_rb16(pb);
106 ffm->dts = avio_rb64(pb);
107 frame_offset = avio_rb16(pb);
108 avio_read(pb, ffm->packet, ffm->packet_size - FFM_HEADER_SIZE);
109 ffm->packet_end = ffm->packet + (ffm->packet_size - FFM_HEADER_SIZE - fill_size);
110 if (ffm->packet_end < ffm->packet || frame_offset < 0)
112 /* if first packet or resynchronization packet, we must
113 handle it specifically */
114 if (ffm->first_packet || (frame_offset & 0x8000)) {
116 /* This packet has no frame headers in it */
117 if (avio_tell(pb) >= ffm->packet_size * 3LL) {
118 avio_seek(pb, -ffm->packet_size * 2LL, SEEK_CUR);
121 /* This is bad, we cannot find a valid frame header */
124 ffm->first_packet = 0;
125 if ((frame_offset & 0x7fff) < FFM_HEADER_SIZE)
127 ffm->packet_ptr = ffm->packet + (frame_offset & 0x7fff) - FFM_HEADER_SIZE;
131 ffm->packet_ptr = ffm->packet;
135 memcpy(buf, ffm->packet_ptr, len);
137 ffm->packet_ptr += len;
144 /* ensure that acutal seeking happens between FFM_PACKET_SIZE
145 and file_size - FFM_PACKET_SIZE */
146 static int64_t ffm_seek1(AVFormatContext *s, int64_t pos1)
148 FFMContext *ffm = s->priv_data;
149 AVIOContext *pb = s->pb;
152 pos = FFMIN(pos1, ffm->file_size - FFM_PACKET_SIZE);
153 pos = FFMAX(pos, FFM_PACKET_SIZE);
154 av_dlog(s, "seek to %"PRIx64" -> %"PRIx64"\n", pos1, pos);
155 return avio_seek(pb, pos, SEEK_SET);
158 static int64_t get_dts(AVFormatContext *s, int64_t pos)
160 AVIOContext *pb = s->pb;
166 av_dlog(s, "dts=%0.6f\n", dts / 1000000.0);
170 static void adjust_write_index(AVFormatContext *s)
172 FFMContext *ffm = s->priv_data;
173 AVIOContext *pb = s->pb;
175 //int64_t orig_write_index = ffm->write_index;
176 int64_t pos_min, pos_max;
178 int64_t ptr = avio_tell(pb);
182 pos_max = ffm->file_size - 2 * FFM_PACKET_SIZE;
184 pts_start = get_dts(s, pos_min);
186 pts = get_dts(s, pos_max);
188 if (pts - 100000 > pts_start)
191 ffm->write_index = FFM_PACKET_SIZE;
193 pts_start = get_dts(s, pos_min);
195 pts = get_dts(s, pos_max);
197 if (pts - 100000 <= pts_start) {
202 newpos = ((pos_max + pos_min) / (2 * FFM_PACKET_SIZE)) * FFM_PACKET_SIZE;
204 if (newpos == pos_min)
207 newpts = get_dts(s, newpos);
209 if (newpts - 100000 <= pts) {
216 ffm->write_index += pos_max;
220 avio_seek(pb, ptr, SEEK_SET);
224 static int ffm_close(AVFormatContext *s)
228 for (i = 0; i < s->nb_streams; i++)
229 av_freep(&s->streams[i]->codec->rc_eq);
234 static int ffm2_read_header(AVFormatContext *s)
236 FFMContext *ffm = s->priv_data;
238 AVIOContext *pb = s->pb;
239 AVCodecContext *codec;
241 int f_main = 0, f_cprv, f_stvi, f_stau;
245 ffm->packet_size = avio_rb32(pb);
246 if (ffm->packet_size != FFM_PACKET_SIZE) {
247 av_log(s, AV_LOG_ERROR, "Invalid packet size %d, expected size was %d\n",
248 ffm->packet_size, FFM_PACKET_SIZE);
249 ret = AVERROR_INVALIDDATA;
253 ffm->write_index = avio_rb64(pb);
254 /* get also filesize */
256 ffm->file_size = avio_size(pb);
257 if (ffm->write_index && 0)
258 adjust_write_index(s);
260 ffm->file_size = (UINT64_C(1) << 63) - 1;
263 while(!avio_feof(pb)) {
264 unsigned id = avio_rb32(pb);
265 unsigned size = avio_rb32(pb);
266 int64_t next = avio_tell(pb) + size;
273 case MKBETAG('M', 'A', 'I', 'N'):
275 ret = AVERROR(EINVAL);
278 avio_rb32(pb); /* nb_streams */
279 avio_rb32(pb); /* total bitrate */
281 case MKBETAG('C', 'O', 'M', 'M'):
282 f_cprv = f_stvi = f_stau = 0;
283 st = avformat_new_stream(s, NULL);
285 ret = AVERROR(ENOMEM);
289 avpriv_set_pts_info(st, 64, 1, 1000000);
293 codec->codec_id = avio_rb32(pb);
294 codec->codec_type = avio_r8(pb);
295 codec->bit_rate = avio_rb32(pb);
296 codec->flags = avio_rb32(pb);
297 codec->flags2 = avio_rb32(pb);
298 codec->debug = avio_rb32(pb);
299 if (codec->flags & CODEC_FLAG_GLOBAL_HEADER) {
300 if (ff_get_extradata(codec, pb, avio_rb32(pb)) < 0)
301 return AVERROR(ENOMEM);
304 case MKBETAG('S', 'T', 'V', 'I'):
306 ret = AVERROR(EINVAL);
309 codec->time_base.num = avio_rb32(pb);
310 codec->time_base.den = avio_rb32(pb);
311 codec->width = avio_rb16(pb);
312 codec->height = avio_rb16(pb);
313 codec->gop_size = avio_rb16(pb);
314 codec->pix_fmt = avio_rb32(pb);
315 codec->qmin = avio_r8(pb);
316 codec->qmax = avio_r8(pb);
317 codec->max_qdiff = avio_r8(pb);
318 codec->qcompress = avio_rb16(pb) / 10000.0;
319 codec->qblur = avio_rb16(pb) / 10000.0;
320 codec->bit_rate_tolerance = avio_rb32(pb);
321 avio_get_str(pb, INT_MAX, rc_eq_buf, sizeof(rc_eq_buf));
322 codec->rc_eq = av_strdup(rc_eq_buf);
323 codec->rc_max_rate = avio_rb32(pb);
324 codec->rc_min_rate = avio_rb32(pb);
325 codec->rc_buffer_size = avio_rb32(pb);
326 codec->i_quant_factor = av_int2double(avio_rb64(pb));
327 codec->b_quant_factor = av_int2double(avio_rb64(pb));
328 codec->i_quant_offset = av_int2double(avio_rb64(pb));
329 codec->b_quant_offset = av_int2double(avio_rb64(pb));
330 codec->dct_algo = avio_rb32(pb);
331 codec->strict_std_compliance = avio_rb32(pb);
332 codec->max_b_frames = avio_rb32(pb);
333 codec->mpeg_quant = avio_rb32(pb);
334 codec->intra_dc_precision = avio_rb32(pb);
335 codec->me_method = avio_rb32(pb);
336 codec->mb_decision = avio_rb32(pb);
337 codec->nsse_weight = avio_rb32(pb);
338 codec->frame_skip_cmp = avio_rb32(pb);
339 codec->rc_buffer_aggressivity = av_int2double(avio_rb64(pb));
340 codec->codec_tag = avio_rb32(pb);
341 codec->thread_count = avio_r8(pb);
342 codec->coder_type = avio_rb32(pb);
343 codec->me_cmp = avio_rb32(pb);
344 codec->me_subpel_quality = avio_rb32(pb);
345 codec->me_range = avio_rb32(pb);
346 codec->keyint_min = avio_rb32(pb);
347 codec->scenechange_threshold = avio_rb32(pb);
348 codec->b_frame_strategy = avio_rb32(pb);
349 codec->qcompress = av_int2double(avio_rb64(pb));
350 codec->qblur = av_int2double(avio_rb64(pb));
351 codec->max_qdiff = avio_rb32(pb);
352 codec->refs = avio_rb32(pb);
354 case MKBETAG('S', 'T', 'A', 'U'):
356 ret = AVERROR(EINVAL);
359 codec->sample_rate = avio_rb32(pb);
360 codec->channels = avio_rl16(pb);
361 codec->frame_size = avio_rl16(pb);
363 case MKBETAG('C', 'P', 'R', 'V'):
365 ret = AVERROR(EINVAL);
368 enc = avcodec_find_encoder(codec->codec_id);
369 if (enc && enc->priv_data_size && enc->priv_class) {
370 st->recommended_encoder_configuration = av_malloc(size + 1);
371 if (!st->recommended_encoder_configuration) {
372 ret = AVERROR(ENOMEM);
375 avio_get_str(pb, size, st->recommended_encoder_configuration, size + 1);
378 case MKBETAG('S', '2', 'V', 'I'):
380 ret = AVERROR(EINVAL);
383 buffer = av_malloc(size);
385 ret = AVERROR(ENOMEM);
388 avio_get_str(pb, INT_MAX, buffer, size);
389 av_set_options_string(codec, buffer, "=", ",");
392 case MKBETAG('S', '2', 'A', 'U'):
394 ret = AVERROR(EINVAL);
397 buffer = av_malloc(size);
399 ret = AVERROR(ENOMEM);
402 avio_get_str(pb, INT_MAX, buffer, size);
403 av_set_options_string(codec, buffer, "=", ",");
407 avio_seek(pb, next, SEEK_SET);
410 /* get until end of block reached */
411 while ((avio_tell(pb) % ffm->packet_size) != 0)
414 /* init packet demux */
415 ffm->packet_ptr = ffm->packet;
416 ffm->packet_end = ffm->packet;
417 ffm->frame_offset = 0;
419 ffm->read_state = READ_HEADER;
420 ffm->first_packet = 1;
427 static int ffm_read_header(AVFormatContext *s)
429 FFMContext *ffm = s->priv_data;
431 AVIOContext *pb = s->pb;
432 AVCodecContext *codec;
438 if (tag == MKTAG('F', 'F', 'M', '2'))
439 return ffm2_read_header(s);
440 if (tag != MKTAG('F', 'F', 'M', '1'))
442 ffm->packet_size = avio_rb32(pb);
443 if (ffm->packet_size != FFM_PACKET_SIZE)
445 ffm->write_index = avio_rb64(pb);
446 /* get also filesize */
448 ffm->file_size = avio_size(pb);
449 if (ffm->write_index && 0)
450 adjust_write_index(s);
452 ffm->file_size = (UINT64_C(1) << 63) - 1;
455 nb_streams = avio_rb32(pb);
456 avio_rb32(pb); /* total bitrate */
457 /* read each stream */
458 for(i=0;i<nb_streams;i++) {
461 st = avformat_new_stream(s, NULL);
465 avpriv_set_pts_info(st, 64, 1, 1000000);
469 codec->codec_id = avio_rb32(pb);
470 codec->codec_type = avio_r8(pb); /* codec_type */
471 codec->bit_rate = avio_rb32(pb);
472 codec->flags = avio_rb32(pb);
473 codec->flags2 = avio_rb32(pb);
474 codec->debug = avio_rb32(pb);
476 switch(codec->codec_type) {
477 case AVMEDIA_TYPE_VIDEO:
478 codec->time_base.num = avio_rb32(pb);
479 codec->time_base.den = avio_rb32(pb);
480 codec->width = avio_rb16(pb);
481 codec->height = avio_rb16(pb);
482 codec->gop_size = avio_rb16(pb);
483 codec->pix_fmt = avio_rb32(pb);
484 codec->qmin = avio_r8(pb);
485 codec->qmax = avio_r8(pb);
486 codec->max_qdiff = avio_r8(pb);
487 codec->qcompress = avio_rb16(pb) / 10000.0;
488 codec->qblur = avio_rb16(pb) / 10000.0;
489 codec->bit_rate_tolerance = avio_rb32(pb);
490 avio_get_str(pb, INT_MAX, rc_eq_buf, sizeof(rc_eq_buf));
491 codec->rc_eq = av_strdup(rc_eq_buf);
492 codec->rc_max_rate = avio_rb32(pb);
493 codec->rc_min_rate = avio_rb32(pb);
494 codec->rc_buffer_size = avio_rb32(pb);
495 codec->i_quant_factor = av_int2double(avio_rb64(pb));
496 codec->b_quant_factor = av_int2double(avio_rb64(pb));
497 codec->i_quant_offset = av_int2double(avio_rb64(pb));
498 codec->b_quant_offset = av_int2double(avio_rb64(pb));
499 codec->dct_algo = avio_rb32(pb);
500 codec->strict_std_compliance = avio_rb32(pb);
501 codec->max_b_frames = avio_rb32(pb);
502 codec->mpeg_quant = avio_rb32(pb);
503 codec->intra_dc_precision = avio_rb32(pb);
504 codec->me_method = avio_rb32(pb);
505 codec->mb_decision = avio_rb32(pb);
506 codec->nsse_weight = avio_rb32(pb);
507 codec->frame_skip_cmp = avio_rb32(pb);
508 codec->rc_buffer_aggressivity = av_int2double(avio_rb64(pb));
509 codec->codec_tag = avio_rb32(pb);
510 codec->thread_count = avio_r8(pb);
511 codec->coder_type = avio_rb32(pb);
512 codec->me_cmp = avio_rb32(pb);
513 codec->me_subpel_quality = avio_rb32(pb);
514 codec->me_range = avio_rb32(pb);
515 codec->keyint_min = avio_rb32(pb);
516 codec->scenechange_threshold = avio_rb32(pb);
517 codec->b_frame_strategy = avio_rb32(pb);
518 codec->qcompress = av_int2double(avio_rb64(pb));
519 codec->qblur = av_int2double(avio_rb64(pb));
520 codec->max_qdiff = avio_rb32(pb);
521 codec->refs = avio_rb32(pb);
523 case AVMEDIA_TYPE_AUDIO:
524 codec->sample_rate = avio_rb32(pb);
525 codec->channels = avio_rl16(pb);
526 codec->frame_size = avio_rl16(pb);
531 if (codec->flags & CODEC_FLAG_GLOBAL_HEADER) {
532 if (ff_get_extradata(codec, pb, avio_rb32(pb)) < 0)
533 return AVERROR(ENOMEM);
537 /* get until end of block reached */
538 while ((avio_tell(pb) % ffm->packet_size) != 0)
541 /* init packet demux */
542 ffm->packet_ptr = ffm->packet;
543 ffm->packet_end = ffm->packet;
544 ffm->frame_offset = 0;
546 ffm->read_state = READ_HEADER;
547 ffm->first_packet = 1;
554 /* return < 0 if eof */
555 static int ffm_read_packet(AVFormatContext *s, AVPacket *pkt)
558 FFMContext *ffm = s->priv_data;
561 switch(ffm->read_state) {
563 if ((ret = ffm_is_avail_data(s, FRAME_HEADER_SIZE+4)) < 0)
566 av_dlog(s, "pos=%08"PRIx64" spos=%"PRIx64", write_index=%"PRIx64" size=%"PRIx64"\n",
567 avio_tell(s->pb), s->pb->pos, ffm->write_index, ffm->file_size);
568 if (ffm_read_data(s, ffm->header, FRAME_HEADER_SIZE, 1) !=
571 if (ffm->header[1] & FLAG_DTS)
572 if (ffm_read_data(s, ffm->header+16, 4, 1) != 4)
574 ffm->read_state = READ_DATA;
577 size = AV_RB24(ffm->header + 2);
578 if ((ret = ffm_is_avail_data(s, size)) < 0)
581 duration = AV_RB24(ffm->header + 5);
583 if (av_new_packet(pkt, size) < 0) {
584 return AVERROR(ENOMEM);
586 pkt->stream_index = ffm->header[0];
587 if ((unsigned)pkt->stream_index >= s->nb_streams) {
588 av_log(s, AV_LOG_ERROR, "invalid stream index %d\n", pkt->stream_index);
590 ffm->read_state = READ_HEADER;
593 pkt->pos = avio_tell(s->pb);
594 if (ffm->header[1] & FLAG_KEY_FRAME)
595 pkt->flags |= AV_PKT_FLAG_KEY;
597 ffm->read_state = READ_HEADER;
598 if (ffm_read_data(s, pkt->data, size, 0) != size) {
599 /* bad case: desynchronized packet. we cancel all the packet loading */
603 pkt->pts = AV_RB64(ffm->header+8);
604 if (ffm->header[1] & FLAG_DTS)
605 pkt->dts = pkt->pts - AV_RB32(ffm->header+16);
608 pkt->duration = duration;
614 /* seek to a given time in the file. The file read pointer is
615 positioned at or before pts. XXX: the following code is quite
617 static int ffm_seek(AVFormatContext *s, int stream_index, int64_t wanted_pts, int flags)
619 FFMContext *ffm = s->priv_data;
620 int64_t pos_min, pos_max, pos;
621 int64_t pts_min, pts_max, pts;
624 av_dlog(s, "wanted_pts=%0.6f\n", wanted_pts / 1000000.0);
625 /* find the position using linear interpolation (better than
626 dichotomy in typical cases) */
627 if (ffm->write_index && ffm->write_index < ffm->file_size) {
628 if (get_dts(s, FFM_PACKET_SIZE) < wanted_pts) {
629 pos_min = FFM_PACKET_SIZE;
630 pos_max = ffm->write_index - FFM_PACKET_SIZE;
632 pos_min = ffm->write_index;
633 pos_max = ffm->file_size - FFM_PACKET_SIZE;
636 pos_min = FFM_PACKET_SIZE;
637 pos_max = ffm->file_size - FFM_PACKET_SIZE;
639 while (pos_min <= pos_max) {
640 pts_min = get_dts(s, pos_min);
641 pts_max = get_dts(s, pos_max);
642 if (pts_min > wanted_pts || pts_max <= wanted_pts) {
643 pos = pts_min > wanted_pts ? pos_min : pos_max;
646 /* linear interpolation */
647 pos1 = (double)(pos_max - pos_min) * (double)(wanted_pts - pts_min) /
648 (double)(pts_max - pts_min);
649 pos = (((int64_t)pos1) / FFM_PACKET_SIZE) * FFM_PACKET_SIZE;
652 else if (pos >= pos_max)
654 pts = get_dts(s, pos);
655 /* check if we are lucky */
656 if (pts == wanted_pts) {
658 } else if (pts > wanted_pts) {
659 pos_max = pos - FFM_PACKET_SIZE;
661 pos_min = pos + FFM_PACKET_SIZE;
664 pos = (flags & AVSEEK_FLAG_BACKWARD) ? pos_min : pos_max;
667 if (ffm_seek1(s, pos) < 0)
670 /* reset read state */
671 ffm->read_state = READ_HEADER;
672 ffm->packet_ptr = ffm->packet;
673 ffm->packet_end = ffm->packet;
674 ffm->first_packet = 1;
679 static int ffm_probe(AVProbeData *p)
682 p->buf[0] == 'F' && p->buf[1] == 'F' && p->buf[2] == 'M' &&
683 (p->buf[3] == '1' || p->buf[3] == '2'))
684 return AVPROBE_SCORE_MAX + 1;
688 AVInputFormat ff_ffm_demuxer = {
690 .long_name = NULL_IF_CONFIG_SMALL("FFM (FFserver live feed)"),
691 .priv_data_size = sizeof(FFMContext),
692 .read_probe = ffm_probe,
693 .read_header = ffm_read_header,
694 .read_packet = ffm_read_packet,
695 .read_close = ffm_close,
696 .read_seek = ffm_seek,