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/internal.h"
25 #include "libavutil/intreadwrite.h"
26 #include "libavutil/intfloat.h"
27 #include "libavutil/opt.h"
28 #include "libavutil/avassert.h"
29 #include "libavutil/avstring.h"
33 #include "avio_internal.h"
35 static int ffm_is_avail_data(AVFormatContext *s, int size)
37 FFMContext *ffm = s->priv_data;
38 int64_t pos, avail_size;
41 len = ffm->packet_end - ffm->packet_ptr;
44 pos = avio_tell(s->pb);
45 if (!ffm->write_index) {
46 if (pos == ffm->file_size)
48 avail_size = ffm->file_size - pos;
50 if (pos == ffm->write_index) {
51 /* exactly at the end of stream */
52 return AVERROR(EAGAIN);
53 } else if (pos < ffm->write_index) {
54 avail_size = ffm->write_index - pos;
56 avail_size = (ffm->file_size - pos) + (ffm->write_index - FFM_PACKET_SIZE);
59 avail_size = (avail_size / ffm->packet_size) * (ffm->packet_size - FFM_HEADER_SIZE) + len;
60 if (size <= avail_size)
63 return AVERROR(EAGAIN);
66 static int ffm_resync(AVFormatContext *s, int state)
68 av_log(s, AV_LOG_ERROR, "resyncing\n");
69 while (state != PACKET_ID) {
70 if (avio_feof(s->pb)) {
71 av_log(s, AV_LOG_ERROR, "cannot find FFM syncword\n");
74 state = (state << 8) | avio_r8(s->pb);
79 /* first is true if we read the frame header */
80 static int ffm_read_data(AVFormatContext *s,
81 uint8_t *buf, int size, int header)
83 FFMContext *ffm = s->priv_data;
84 AVIOContext *pb = s->pb;
85 int len, fill_size, size1, frame_offset, id;
86 int64_t last_pos = -1;
91 len = ffm->packet_end - ffm->packet_ptr;
97 if (avio_tell(pb) == ffm->file_size)
98 avio_seek(pb, ffm->packet_size, SEEK_SET);
100 if (pb->buffer_size != ffm->packet_size) {
101 int64_t tell = avio_tell(pb);
102 int ret = ffio_set_buf_size(pb, ffm->packet_size);
105 avio_seek(pb, tell, SEEK_SET);
107 id = avio_rb16(pb); /* PACKET_ID */
108 if (id != PACKET_ID) {
109 if (ffm_resync(s, id) < 0)
111 last_pos = avio_tell(pb);
113 fill_size = avio_rb16(pb);
114 ffm->dts = avio_rb64(pb);
115 frame_offset = avio_rb16(pb);
116 avio_read(pb, ffm->packet, ffm->packet_size - FFM_HEADER_SIZE);
117 ffm->packet_end = ffm->packet + (ffm->packet_size - FFM_HEADER_SIZE - fill_size);
118 if (ffm->packet_end < ffm->packet || frame_offset < 0)
120 /* if first packet or resynchronization packet, we must
121 handle it specifically */
122 if (ffm->first_packet || (frame_offset & 0x8000)) {
124 /* This packet has no frame headers in it */
125 if (avio_tell(pb) >= ffm->packet_size * 3LL) {
126 int64_t seekback = FFMIN(ffm->packet_size * 2LL, avio_tell(pb) - last_pos);
127 seekback = FFMAX(seekback, 0);
128 avio_seek(pb, -seekback, SEEK_CUR);
131 /* This is bad, we cannot find a valid frame header */
134 ffm->first_packet = 0;
135 if ((frame_offset & 0x7fff) < FFM_HEADER_SIZE)
137 ffm->packet_ptr = ffm->packet + (frame_offset & 0x7fff) - FFM_HEADER_SIZE;
141 ffm->packet_ptr = ffm->packet;
145 memcpy(buf, ffm->packet_ptr, len);
147 ffm->packet_ptr += len;
154 /* ensure that actual seeking happens between FFM_PACKET_SIZE
155 and file_size - FFM_PACKET_SIZE */
156 static int64_t ffm_seek1(AVFormatContext *s, int64_t pos1)
158 FFMContext *ffm = s->priv_data;
159 AVIOContext *pb = s->pb;
162 pos = FFMIN(pos1, ffm->file_size - FFM_PACKET_SIZE);
163 pos = FFMAX(pos, FFM_PACKET_SIZE);
164 ff_dlog(s, "seek to %"PRIx64" -> %"PRIx64"\n", pos1, pos);
165 return avio_seek(pb, pos, SEEK_SET);
168 static int64_t get_dts(AVFormatContext *s, int64_t pos)
170 AVIOContext *pb = s->pb;
176 ff_dlog(s, "dts=%0.6f\n", dts / 1000000.0);
180 static void adjust_write_index(AVFormatContext *s)
182 FFMContext *ffm = s->priv_data;
183 AVIOContext *pb = s->pb;
185 //int64_t orig_write_index = ffm->write_index;
186 int64_t pos_min, pos_max;
188 int64_t ptr = avio_tell(pb);
192 pos_max = ffm->file_size - 2 * FFM_PACKET_SIZE;
194 pts_start = get_dts(s, pos_min);
196 pts = get_dts(s, pos_max);
198 if (pts - 100000 > pts_start)
201 ffm->write_index = FFM_PACKET_SIZE;
203 pts_start = get_dts(s, pos_min);
205 pts = get_dts(s, pos_max);
207 if (pts - 100000 <= pts_start) {
212 newpos = ((pos_max + pos_min) / (2 * FFM_PACKET_SIZE)) * FFM_PACKET_SIZE;
214 if (newpos == pos_min)
217 newpts = get_dts(s, newpos);
219 if (newpts - 100000 <= pts) {
226 ffm->write_index += pos_max;
230 avio_seek(pb, ptr, SEEK_SET);
234 static int ffm_close(AVFormatContext *s)
238 for (i = 0; i < s->nb_streams; i++)
239 av_freep(&s->streams[i]->codec->rc_eq);
244 static int ffm_append_recommended_configuration(AVStream *st, char **conf)
248 av_assert0(conf && st);
251 if (!st->recommended_encoder_configuration) {
252 st->recommended_encoder_configuration = *conf;
256 newsize = strlen(*conf) + strlen(st->recommended_encoder_configuration) + 2;
257 if ((ret = av_reallocp(&st->recommended_encoder_configuration, newsize)) < 0)
259 av_strlcat(st->recommended_encoder_configuration, ",", newsize);
260 av_strlcat(st->recommended_encoder_configuration, *conf, newsize);
265 static int ffm2_read_header(AVFormatContext *s)
267 FFMContext *ffm = s->priv_data;
269 AVIOContext *pb = s->pb;
270 AVCodecContext *codec;
272 int f_main = 0, f_cprv = -1, f_stvi = -1, f_stau = -1;
276 ffm->packet_size = avio_rb32(pb);
277 if (ffm->packet_size != FFM_PACKET_SIZE) {
278 av_log(s, AV_LOG_ERROR, "Invalid packet size %d, expected size was %d\n",
279 ffm->packet_size, FFM_PACKET_SIZE);
280 ret = AVERROR_INVALIDDATA;
284 ffm->write_index = avio_rb64(pb);
285 /* get also filesize */
287 ffm->file_size = avio_size(pb);
288 if (ffm->write_index && 0)
289 adjust_write_index(s);
291 ffm->file_size = (UINT64_C(1) << 63) - 1;
294 while(!avio_feof(pb)) {
295 unsigned id = avio_rb32(pb);
296 unsigned size = avio_rb32(pb);
297 int64_t next = avio_tell(pb) + size;
304 case MKBETAG('M', 'A', 'I', 'N'):
306 ret = AVERROR(EINVAL);
309 avio_rb32(pb); /* nb_streams */
310 avio_rb32(pb); /* total bitrate */
312 case MKBETAG('C', 'O', 'M', 'M'):
313 f_cprv = f_stvi = f_stau = 0;
314 st = avformat_new_stream(s, NULL);
316 ret = AVERROR(ENOMEM);
320 avpriv_set_pts_info(st, 64, 1, 1000000);
324 codec->codec_id = avio_rb32(pb);
325 codec->codec_type = avio_r8(pb);
326 codec->bit_rate = avio_rb32(pb);
327 codec->flags = avio_rb32(pb);
328 codec->flags2 = avio_rb32(pb);
329 codec->debug = avio_rb32(pb);
330 if (codec->flags & AV_CODEC_FLAG_GLOBAL_HEADER) {
331 if (ff_get_extradata(codec, pb, avio_rb32(pb)) < 0)
332 return AVERROR(ENOMEM);
335 case MKBETAG('S', 'T', 'V', 'I'):
337 ret = AVERROR(EINVAL);
340 codec->time_base.num = avio_rb32(pb);
341 codec->time_base.den = avio_rb32(pb);
342 if (codec->time_base.num <= 0 || codec->time_base.den <= 0) {
343 av_log(s, AV_LOG_ERROR, "Invalid time base %d/%d\n",
344 codec->time_base.num, codec->time_base.den);
345 ret = AVERROR_INVALIDDATA;
348 codec->width = avio_rb16(pb);
349 codec->height = avio_rb16(pb);
350 codec->gop_size = avio_rb16(pb);
351 codec->pix_fmt = avio_rb32(pb);
352 codec->qmin = avio_r8(pb);
353 codec->qmax = avio_r8(pb);
354 codec->max_qdiff = avio_r8(pb);
355 codec->qcompress = avio_rb16(pb) / 10000.0;
356 codec->qblur = avio_rb16(pb) / 10000.0;
357 codec->bit_rate_tolerance = avio_rb32(pb);
358 avio_get_str(pb, INT_MAX, rc_eq_buf, sizeof(rc_eq_buf));
359 codec->rc_eq = av_strdup(rc_eq_buf);
360 codec->rc_max_rate = avio_rb32(pb);
361 codec->rc_min_rate = avio_rb32(pb);
362 codec->rc_buffer_size = avio_rb32(pb);
363 codec->i_quant_factor = av_int2double(avio_rb64(pb));
364 codec->b_quant_factor = av_int2double(avio_rb64(pb));
365 codec->i_quant_offset = av_int2double(avio_rb64(pb));
366 codec->b_quant_offset = av_int2double(avio_rb64(pb));
367 codec->dct_algo = avio_rb32(pb);
368 codec->strict_std_compliance = avio_rb32(pb);
369 codec->max_b_frames = avio_rb32(pb);
370 codec->mpeg_quant = avio_rb32(pb);
371 codec->intra_dc_precision = avio_rb32(pb);
372 codec->me_method = avio_rb32(pb);
373 codec->mb_decision = avio_rb32(pb);
374 codec->nsse_weight = avio_rb32(pb);
375 codec->frame_skip_cmp = avio_rb32(pb);
376 codec->rc_buffer_aggressivity = av_int2double(avio_rb64(pb));
377 codec->codec_tag = avio_rb32(pb);
378 codec->thread_count = avio_r8(pb);
379 codec->coder_type = avio_rb32(pb);
380 codec->me_cmp = avio_rb32(pb);
381 codec->me_subpel_quality = avio_rb32(pb);
382 codec->me_range = avio_rb32(pb);
383 codec->keyint_min = avio_rb32(pb);
384 codec->scenechange_threshold = avio_rb32(pb);
385 codec->b_frame_strategy = avio_rb32(pb);
386 codec->qcompress = av_int2double(avio_rb64(pb));
387 codec->qblur = av_int2double(avio_rb64(pb));
388 codec->max_qdiff = avio_rb32(pb);
389 codec->refs = avio_rb32(pb);
391 case MKBETAG('S', 'T', 'A', 'U'):
393 ret = AVERROR(EINVAL);
396 codec->sample_rate = avio_rb32(pb);
397 codec->channels = avio_rl16(pb);
398 codec->frame_size = avio_rl16(pb);
400 case MKBETAG('C', 'P', 'R', 'V'):
402 ret = AVERROR(EINVAL);
405 enc = avcodec_find_encoder(codec->codec_id);
406 if (enc && enc->priv_data_size && enc->priv_class) {
407 buffer = av_malloc(size + 1);
409 ret = AVERROR(ENOMEM);
412 avio_get_str(pb, size, buffer, size + 1);
413 if ((ret = ffm_append_recommended_configuration(st, &buffer)) < 0)
417 case MKBETAG('S', '2', 'V', 'I'):
419 ret = AVERROR(EINVAL);
422 buffer = av_malloc(size);
424 ret = AVERROR(ENOMEM);
427 avio_get_str(pb, INT_MAX, buffer, size);
428 av_set_options_string(codec, buffer, "=", ",");
429 if ((ret = ffm_append_recommended_configuration(st, &buffer)) < 0)
432 case MKBETAG('S', '2', 'A', 'U'):
434 ret = AVERROR(EINVAL);
437 buffer = av_malloc(size);
439 ret = AVERROR(ENOMEM);
442 avio_get_str(pb, INT_MAX, buffer, size);
443 av_set_options_string(codec, buffer, "=", ",");
444 if ((ret = ffm_append_recommended_configuration(st, &buffer)) < 0)
448 avio_seek(pb, next, SEEK_SET);
451 /* get until end of block reached */
452 while ((avio_tell(pb) % ffm->packet_size) != 0 && !pb->eof_reached)
455 /* init packet demux */
456 ffm->packet_ptr = ffm->packet;
457 ffm->packet_end = ffm->packet;
458 ffm->frame_offset = 0;
460 ffm->read_state = READ_HEADER;
461 ffm->first_packet = 1;
468 static int ffm_read_header(AVFormatContext *s)
470 FFMContext *ffm = s->priv_data;
472 AVIOContext *pb = s->pb;
473 AVCodecContext *codec;
479 if (tag == MKTAG('F', 'F', 'M', '2'))
480 return ffm2_read_header(s);
481 if (tag != MKTAG('F', 'F', 'M', '1'))
483 ffm->packet_size = avio_rb32(pb);
484 if (ffm->packet_size != FFM_PACKET_SIZE)
486 ffm->write_index = avio_rb64(pb);
487 /* get also filesize */
489 ffm->file_size = avio_size(pb);
490 if (ffm->write_index && 0)
491 adjust_write_index(s);
493 ffm->file_size = (UINT64_C(1) << 63) - 1;
496 nb_streams = avio_rb32(pb);
497 avio_rb32(pb); /* total bitrate */
498 /* read each stream */
499 for(i=0;i<nb_streams;i++) {
502 st = avformat_new_stream(s, NULL);
506 avpriv_set_pts_info(st, 64, 1, 1000000);
510 codec->codec_id = avio_rb32(pb);
511 codec->codec_type = avio_r8(pb); /* codec_type */
512 codec->bit_rate = avio_rb32(pb);
513 codec->flags = avio_rb32(pb);
514 codec->flags2 = avio_rb32(pb);
515 codec->debug = avio_rb32(pb);
517 switch(codec->codec_type) {
518 case AVMEDIA_TYPE_VIDEO:
519 codec->time_base.num = avio_rb32(pb);
520 codec->time_base.den = avio_rb32(pb);
521 if (codec->time_base.num <= 0 || codec->time_base.den <= 0) {
522 av_log(s, AV_LOG_ERROR, "Invalid time base %d/%d\n",
523 codec->time_base.num, codec->time_base.den);
526 codec->width = avio_rb16(pb);
527 codec->height = avio_rb16(pb);
528 codec->gop_size = avio_rb16(pb);
529 codec->pix_fmt = avio_rb32(pb);
530 codec->qmin = avio_r8(pb);
531 codec->qmax = avio_r8(pb);
532 codec->max_qdiff = avio_r8(pb);
533 codec->qcompress = avio_rb16(pb) / 10000.0;
534 codec->qblur = avio_rb16(pb) / 10000.0;
535 codec->bit_rate_tolerance = avio_rb32(pb);
536 avio_get_str(pb, INT_MAX, rc_eq_buf, sizeof(rc_eq_buf));
537 codec->rc_eq = av_strdup(rc_eq_buf);
538 codec->rc_max_rate = avio_rb32(pb);
539 codec->rc_min_rate = avio_rb32(pb);
540 codec->rc_buffer_size = avio_rb32(pb);
541 codec->i_quant_factor = av_int2double(avio_rb64(pb));
542 codec->b_quant_factor = av_int2double(avio_rb64(pb));
543 codec->i_quant_offset = av_int2double(avio_rb64(pb));
544 codec->b_quant_offset = av_int2double(avio_rb64(pb));
545 codec->dct_algo = avio_rb32(pb);
546 codec->strict_std_compliance = avio_rb32(pb);
547 codec->max_b_frames = avio_rb32(pb);
548 codec->mpeg_quant = avio_rb32(pb);
549 codec->intra_dc_precision = avio_rb32(pb);
550 codec->me_method = avio_rb32(pb);
551 codec->mb_decision = avio_rb32(pb);
552 codec->nsse_weight = avio_rb32(pb);
553 codec->frame_skip_cmp = avio_rb32(pb);
554 codec->rc_buffer_aggressivity = av_int2double(avio_rb64(pb));
555 codec->codec_tag = avio_rb32(pb);
556 codec->thread_count = avio_r8(pb);
557 codec->coder_type = avio_rb32(pb);
558 codec->me_cmp = avio_rb32(pb);
559 codec->me_subpel_quality = avio_rb32(pb);
560 codec->me_range = avio_rb32(pb);
561 codec->keyint_min = avio_rb32(pb);
562 codec->scenechange_threshold = avio_rb32(pb);
563 codec->b_frame_strategy = avio_rb32(pb);
564 codec->qcompress = av_int2double(avio_rb64(pb));
565 codec->qblur = av_int2double(avio_rb64(pb));
566 codec->max_qdiff = avio_rb32(pb);
567 codec->refs = avio_rb32(pb);
569 case AVMEDIA_TYPE_AUDIO:
570 codec->sample_rate = avio_rb32(pb);
571 codec->channels = avio_rl16(pb);
572 codec->frame_size = avio_rl16(pb);
577 if (codec->flags & AV_CODEC_FLAG_GLOBAL_HEADER) {
578 if (ff_get_extradata(codec, pb, avio_rb32(pb)) < 0)
579 return AVERROR(ENOMEM);
583 /* get until end of block reached */
584 while ((avio_tell(pb) % ffm->packet_size) != 0 && !pb->eof_reached)
587 /* init packet demux */
588 ffm->packet_ptr = ffm->packet;
589 ffm->packet_end = ffm->packet;
590 ffm->frame_offset = 0;
592 ffm->read_state = READ_HEADER;
593 ffm->first_packet = 1;
600 /* return < 0 if eof */
601 static int ffm_read_packet(AVFormatContext *s, AVPacket *pkt)
604 FFMContext *ffm = s->priv_data;
607 switch(ffm->read_state) {
609 if ((ret = ffm_is_avail_data(s, FRAME_HEADER_SIZE+4)) < 0)
612 ff_dlog(s, "pos=%08"PRIx64" spos=%"PRIx64", write_index=%"PRIx64" size=%"PRIx64"\n",
613 avio_tell(s->pb), s->pb->pos, ffm->write_index, ffm->file_size);
614 if (ffm_read_data(s, ffm->header, FRAME_HEADER_SIZE, 1) !=
617 if (ffm->header[1] & FLAG_DTS)
618 if (ffm_read_data(s, ffm->header+16, 4, 1) != 4)
620 ffm->read_state = READ_DATA;
623 size = AV_RB24(ffm->header + 2);
624 if ((ret = ffm_is_avail_data(s, size)) < 0)
627 duration = AV_RB24(ffm->header + 5);
629 if (av_new_packet(pkt, size) < 0) {
630 return AVERROR(ENOMEM);
632 pkt->stream_index = ffm->header[0];
633 if ((unsigned)pkt->stream_index >= s->nb_streams) {
634 av_log(s, AV_LOG_ERROR, "invalid stream index %d\n", pkt->stream_index);
635 av_packet_unref(pkt);
636 ffm->read_state = READ_HEADER;
639 pkt->pos = avio_tell(s->pb);
640 if (ffm->header[1] & FLAG_KEY_FRAME)
641 pkt->flags |= AV_PKT_FLAG_KEY;
643 ffm->read_state = READ_HEADER;
644 if (ffm_read_data(s, pkt->data, size, 0) != size) {
645 /* bad case: desynchronized packet. we cancel all the packet loading */
646 av_packet_unref(pkt);
649 pkt->pts = AV_RB64(ffm->header+8);
650 if (ffm->header[1] & FLAG_DTS)
651 pkt->dts = pkt->pts - AV_RB32(ffm->header+16);
654 pkt->duration = duration;
660 /* seek to a given time in the file. The file read pointer is
661 positioned at or before pts. XXX: the following code is quite
663 static int ffm_seek(AVFormatContext *s, int stream_index, int64_t wanted_pts, int flags)
665 FFMContext *ffm = s->priv_data;
666 int64_t pos_min, pos_max, pos;
667 int64_t pts_min, pts_max, pts;
670 ff_dlog(s, "wanted_pts=%0.6f\n", wanted_pts / 1000000.0);
671 /* find the position using linear interpolation (better than
672 dichotomy in typical cases) */
673 if (ffm->write_index && ffm->write_index < ffm->file_size) {
674 if (get_dts(s, FFM_PACKET_SIZE) < wanted_pts) {
675 pos_min = FFM_PACKET_SIZE;
676 pos_max = ffm->write_index - FFM_PACKET_SIZE;
678 pos_min = ffm->write_index;
679 pos_max = ffm->file_size - FFM_PACKET_SIZE;
682 pos_min = FFM_PACKET_SIZE;
683 pos_max = ffm->file_size - FFM_PACKET_SIZE;
685 while (pos_min <= pos_max) {
686 pts_min = get_dts(s, pos_min);
687 pts_max = get_dts(s, pos_max);
688 if (pts_min > wanted_pts || pts_max <= wanted_pts) {
689 pos = pts_min > wanted_pts ? pos_min : pos_max;
692 /* linear interpolation */
693 pos1 = (double)(pos_max - pos_min) * (double)(wanted_pts - pts_min) /
694 (double)(pts_max - pts_min);
695 pos = (((int64_t)pos1) / FFM_PACKET_SIZE) * FFM_PACKET_SIZE;
698 else if (pos >= pos_max)
700 pts = get_dts(s, pos);
701 /* check if we are lucky */
702 if (pts == wanted_pts) {
704 } else if (pts > wanted_pts) {
705 pos_max = pos - FFM_PACKET_SIZE;
707 pos_min = pos + FFM_PACKET_SIZE;
710 pos = (flags & AVSEEK_FLAG_BACKWARD) ? pos_min : pos_max;
713 if (ffm_seek1(s, pos) < 0)
716 /* reset read state */
717 ffm->read_state = READ_HEADER;
718 ffm->packet_ptr = ffm->packet;
719 ffm->packet_end = ffm->packet;
720 ffm->first_packet = 1;
725 static int ffm_probe(AVProbeData *p)
728 p->buf[0] == 'F' && p->buf[1] == 'F' && p->buf[2] == 'M' &&
729 (p->buf[3] == '1' || p->buf[3] == '2'))
730 return AVPROBE_SCORE_MAX + 1;
734 AVInputFormat ff_ffm_demuxer = {
736 .long_name = NULL_IF_CONFIG_SMALL("FFM (FFserver live feed)"),
737 .priv_data_size = sizeof(FFMContext),
738 .read_probe = ffm_probe,
739 .read_header = ffm_read_header,
740 .read_packet = ffm_read_packet,
741 .read_close = ffm_close,
742 .read_seek = ffm_seek,