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 if (ffm->server_attached)
53 return AVERROR(EAGAIN);
55 return AVERROR_INVALIDDATA;
56 } else if (pos < ffm->write_index) {
57 avail_size = ffm->write_index - pos;
59 avail_size = (ffm->file_size - pos) + (ffm->write_index - FFM_PACKET_SIZE);
62 avail_size = (avail_size / ffm->packet_size) * (ffm->packet_size - FFM_HEADER_SIZE) + len;
63 if (size <= avail_size)
65 else if (ffm->server_attached)
66 return AVERROR(EAGAIN);
68 return AVERROR_INVALIDDATA;
71 static int ffm_resync(AVFormatContext *s, int state)
73 av_log(s, AV_LOG_ERROR, "resyncing\n");
74 while (state != PACKET_ID) {
75 if (avio_feof(s->pb)) {
76 av_log(s, AV_LOG_ERROR, "cannot find FFM syncword\n");
79 state = (state << 8) | avio_r8(s->pb);
84 /* first is true if we read the frame header */
85 static int ffm_read_data(AVFormatContext *s,
86 uint8_t *buf, int size, int header)
88 FFMContext *ffm = s->priv_data;
89 AVIOContext *pb = s->pb;
90 int len, fill_size, size1, frame_offset, id;
91 int64_t last_pos = -1;
96 len = ffm->packet_end - ffm->packet_ptr;
102 if (avio_tell(pb) == ffm->file_size)
103 if (ffm->server_attached)
104 avio_seek(pb, ffm->packet_size, SEEK_SET);
108 if (pb->buffer_size != ffm->packet_size) {
109 int64_t tell = avio_tell(pb);
110 int ret = ffio_set_buf_size(pb, ffm->packet_size);
113 avio_seek(pb, tell, SEEK_SET);
115 id = avio_rb16(pb); /* PACKET_ID */
116 if (id != PACKET_ID) {
117 if (ffm_resync(s, id) < 0)
119 last_pos = avio_tell(pb);
121 fill_size = avio_rb16(pb);
122 ffm->dts = avio_rb64(pb);
123 frame_offset = avio_rb16(pb);
124 avio_read(pb, ffm->packet, ffm->packet_size - FFM_HEADER_SIZE);
125 ffm->packet_end = ffm->packet + (ffm->packet_size - FFM_HEADER_SIZE - fill_size);
126 if (ffm->packet_end < ffm->packet || frame_offset < 0)
128 /* if first packet or resynchronization packet, we must
129 handle it specifically */
130 if (ffm->first_packet || (frame_offset & 0x8000)) {
132 /* This packet has no frame headers in it */
133 if (avio_tell(pb) >= ffm->packet_size * 3LL) {
134 int64_t seekback = FFMIN(ffm->packet_size * 2LL, avio_tell(pb) - last_pos);
135 seekback = FFMAX(seekback, 0);
136 avio_seek(pb, -seekback, SEEK_CUR);
139 /* This is bad, we cannot find a valid frame header */
142 ffm->first_packet = 0;
143 if ((frame_offset & 0x7fff) < FFM_HEADER_SIZE)
145 ffm->packet_ptr = ffm->packet + (frame_offset & 0x7fff) - FFM_HEADER_SIZE;
149 ffm->packet_ptr = ffm->packet;
153 memcpy(buf, ffm->packet_ptr, len);
155 ffm->packet_ptr += len;
162 /* ensure that actual seeking happens between FFM_PACKET_SIZE
163 and file_size - FFM_PACKET_SIZE */
164 static int64_t ffm_seek1(AVFormatContext *s, int64_t pos1)
166 FFMContext *ffm = s->priv_data;
167 AVIOContext *pb = s->pb;
170 pos = FFMIN(pos1, ffm->file_size - FFM_PACKET_SIZE);
171 pos = FFMAX(pos, FFM_PACKET_SIZE);
172 ff_dlog(s, "seek to %"PRIx64" -> %"PRIx64"\n", pos1, pos);
173 return avio_seek(pb, pos, SEEK_SET);
176 static int64_t get_dts(AVFormatContext *s, int64_t pos)
178 AVIOContext *pb = s->pb;
184 ff_dlog(s, "dts=%0.6f\n", dts / 1000000.0);
188 static void adjust_write_index(AVFormatContext *s)
190 FFMContext *ffm = s->priv_data;
191 AVIOContext *pb = s->pb;
193 //int64_t orig_write_index = ffm->write_index;
194 int64_t pos_min, pos_max;
196 int64_t ptr = avio_tell(pb);
200 pos_max = ffm->file_size - 2 * FFM_PACKET_SIZE;
202 pts_start = get_dts(s, pos_min);
204 pts = get_dts(s, pos_max);
206 if (pts - 100000 > pts_start)
209 ffm->write_index = FFM_PACKET_SIZE;
211 pts_start = get_dts(s, pos_min);
213 pts = get_dts(s, pos_max);
215 if (pts - 100000 <= pts_start) {
220 newpos = ((pos_max + pos_min) / (2 * FFM_PACKET_SIZE)) * FFM_PACKET_SIZE;
222 if (newpos == pos_min)
225 newpts = get_dts(s, newpos);
227 if (newpts - 100000 <= pts) {
234 ffm->write_index += pos_max;
238 avio_seek(pb, ptr, SEEK_SET);
242 static int ffm_close(AVFormatContext *s)
246 for (i = 0; i < s->nb_streams; i++)
247 av_freep(&s->streams[i]->codec->rc_eq);
252 static int ffm_append_recommended_configuration(AVStream *st, char **conf)
256 av_assert0(conf && st);
259 if (!st->recommended_encoder_configuration) {
260 st->recommended_encoder_configuration = *conf;
264 newsize = strlen(*conf) + strlen(st->recommended_encoder_configuration) + 2;
265 if ((ret = av_reallocp(&st->recommended_encoder_configuration, newsize)) < 0)
267 av_strlcat(st->recommended_encoder_configuration, ",", newsize);
268 av_strlcat(st->recommended_encoder_configuration, *conf, newsize);
273 static int ffm2_read_header(AVFormatContext *s)
275 FFMContext *ffm = s->priv_data;
277 AVIOContext *pb = s->pb;
278 AVCodecContext *codec;
280 int f_main = 0, f_cprv = -1, f_stvi = -1, f_stau = -1;
284 ffm->packet_size = avio_rb32(pb);
285 if (ffm->packet_size != FFM_PACKET_SIZE) {
286 av_log(s, AV_LOG_ERROR, "Invalid packet size %d, expected size was %d\n",
287 ffm->packet_size, FFM_PACKET_SIZE);
288 ret = AVERROR_INVALIDDATA;
292 ffm->write_index = avio_rb64(pb);
293 /* get also filesize */
295 ffm->file_size = avio_size(pb);
296 if (ffm->write_index && 0)
297 adjust_write_index(s);
299 ffm->file_size = (UINT64_C(1) << 63) - 1;
302 while(!avio_feof(pb)) {
303 unsigned id = avio_rb32(pb);
304 unsigned size = avio_rb32(pb);
305 int64_t next = avio_tell(pb) + size;
312 case MKBETAG('M', 'A', 'I', 'N'):
314 ret = AVERROR(EINVAL);
317 avio_rb32(pb); /* nb_streams */
318 avio_rb32(pb); /* total bitrate */
320 case MKBETAG('C', 'O', 'M', 'M'):
321 f_cprv = f_stvi = f_stau = 0;
322 st = avformat_new_stream(s, NULL);
324 ret = AVERROR(ENOMEM);
328 avpriv_set_pts_info(st, 64, 1, 1000000);
332 codec->codec_id = avio_rb32(pb);
333 codec->codec_type = avio_r8(pb);
334 codec->bit_rate = avio_rb32(pb);
335 codec->flags = avio_rb32(pb);
336 codec->flags2 = avio_rb32(pb);
337 codec->debug = avio_rb32(pb);
338 if (codec->flags & AV_CODEC_FLAG_GLOBAL_HEADER) {
339 if (ff_get_extradata(codec, pb, avio_rb32(pb)) < 0)
340 return AVERROR(ENOMEM);
343 case MKBETAG('S', 'T', 'V', 'I'):
345 ret = AVERROR(EINVAL);
348 codec->time_base.num = avio_rb32(pb);
349 codec->time_base.den = avio_rb32(pb);
350 if (codec->time_base.num <= 0 || codec->time_base.den <= 0) {
351 av_log(s, AV_LOG_ERROR, "Invalid time base %d/%d\n",
352 codec->time_base.num, codec->time_base.den);
353 ret = AVERROR_INVALIDDATA;
356 codec->width = avio_rb16(pb);
357 codec->height = avio_rb16(pb);
358 codec->gop_size = avio_rb16(pb);
359 codec->pix_fmt = avio_rb32(pb);
360 codec->qmin = avio_r8(pb);
361 codec->qmax = avio_r8(pb);
362 codec->max_qdiff = avio_r8(pb);
363 codec->qcompress = avio_rb16(pb) / 10000.0;
364 codec->qblur = avio_rb16(pb) / 10000.0;
365 codec->bit_rate_tolerance = avio_rb32(pb);
366 avio_get_str(pb, INT_MAX, rc_eq_buf, sizeof(rc_eq_buf));
367 codec->rc_eq = av_strdup(rc_eq_buf);
368 codec->rc_max_rate = avio_rb32(pb);
369 codec->rc_min_rate = avio_rb32(pb);
370 codec->rc_buffer_size = avio_rb32(pb);
371 codec->i_quant_factor = av_int2double(avio_rb64(pb));
372 codec->b_quant_factor = av_int2double(avio_rb64(pb));
373 codec->i_quant_offset = av_int2double(avio_rb64(pb));
374 codec->b_quant_offset = av_int2double(avio_rb64(pb));
375 codec->dct_algo = avio_rb32(pb);
376 codec->strict_std_compliance = avio_rb32(pb);
377 codec->max_b_frames = avio_rb32(pb);
378 codec->mpeg_quant = avio_rb32(pb);
379 codec->intra_dc_precision = avio_rb32(pb);
380 codec->me_method = avio_rb32(pb);
381 codec->mb_decision = avio_rb32(pb);
382 codec->nsse_weight = avio_rb32(pb);
383 codec->frame_skip_cmp = avio_rb32(pb);
384 codec->rc_buffer_aggressivity = av_int2double(avio_rb64(pb));
385 codec->codec_tag = avio_rb32(pb);
386 codec->thread_count = avio_r8(pb);
387 codec->coder_type = avio_rb32(pb);
388 codec->me_cmp = avio_rb32(pb);
389 codec->me_subpel_quality = avio_rb32(pb);
390 codec->me_range = avio_rb32(pb);
391 codec->keyint_min = avio_rb32(pb);
392 codec->scenechange_threshold = avio_rb32(pb);
393 codec->b_frame_strategy = avio_rb32(pb);
394 codec->qcompress = av_int2double(avio_rb64(pb));
395 codec->qblur = av_int2double(avio_rb64(pb));
396 codec->max_qdiff = avio_rb32(pb);
397 codec->refs = avio_rb32(pb);
399 case MKBETAG('S', 'T', 'A', 'U'):
401 ret = AVERROR(EINVAL);
404 codec->sample_rate = avio_rb32(pb);
405 codec->channels = avio_rl16(pb);
406 codec->frame_size = avio_rl16(pb);
408 case MKBETAG('C', 'P', 'R', 'V'):
410 ret = AVERROR(EINVAL);
413 enc = avcodec_find_encoder(codec->codec_id);
414 if (enc && enc->priv_data_size && enc->priv_class) {
415 buffer = av_malloc(size + 1);
417 ret = AVERROR(ENOMEM);
420 avio_get_str(pb, size, buffer, size + 1);
421 if ((ret = ffm_append_recommended_configuration(st, &buffer)) < 0)
425 case MKBETAG('S', '2', 'V', 'I'):
427 ret = AVERROR(EINVAL);
430 buffer = av_malloc(size);
432 ret = AVERROR(ENOMEM);
435 avio_get_str(pb, INT_MAX, buffer, size);
436 av_set_options_string(codec, buffer, "=", ",");
437 if ((ret = ffm_append_recommended_configuration(st, &buffer)) < 0)
440 case MKBETAG('S', '2', 'A', 'U'):
442 ret = AVERROR(EINVAL);
445 buffer = av_malloc(size);
447 ret = AVERROR(ENOMEM);
450 avio_get_str(pb, INT_MAX, buffer, size);
451 av_set_options_string(codec, buffer, "=", ",");
452 if ((ret = ffm_append_recommended_configuration(st, &buffer)) < 0)
456 avio_seek(pb, next, SEEK_SET);
459 /* get until end of block reached */
460 while ((avio_tell(pb) % ffm->packet_size) != 0 && !pb->eof_reached)
463 /* init packet demux */
464 ffm->packet_ptr = ffm->packet;
465 ffm->packet_end = ffm->packet;
466 ffm->frame_offset = 0;
468 ffm->read_state = READ_HEADER;
469 ffm->first_packet = 1;
476 static int ffm_read_header(AVFormatContext *s)
478 FFMContext *ffm = s->priv_data;
480 AVIOContext *pb = s->pb;
481 AVCodecContext *codec;
487 if (tag == MKTAG('F', 'F', 'M', '2'))
488 return ffm2_read_header(s);
489 if (tag != MKTAG('F', 'F', 'M', '1'))
491 ffm->packet_size = avio_rb32(pb);
492 if (ffm->packet_size != FFM_PACKET_SIZE)
494 ffm->write_index = avio_rb64(pb);
495 /* get also filesize */
497 ffm->file_size = avio_size(pb);
498 if (ffm->write_index && 0)
499 adjust_write_index(s);
501 ffm->file_size = (UINT64_C(1) << 63) - 1;
504 nb_streams = avio_rb32(pb);
505 avio_rb32(pb); /* total bitrate */
506 /* read each stream */
507 for(i=0;i<nb_streams;i++) {
510 st = avformat_new_stream(s, NULL);
514 avpriv_set_pts_info(st, 64, 1, 1000000);
518 codec->codec_id = avio_rb32(pb);
519 codec->codec_type = avio_r8(pb); /* codec_type */
520 codec->bit_rate = avio_rb32(pb);
521 codec->flags = avio_rb32(pb);
522 codec->flags2 = avio_rb32(pb);
523 codec->debug = avio_rb32(pb);
525 switch(codec->codec_type) {
526 case AVMEDIA_TYPE_VIDEO:
527 codec->time_base.num = avio_rb32(pb);
528 codec->time_base.den = avio_rb32(pb);
529 if (codec->time_base.num <= 0 || codec->time_base.den <= 0) {
530 av_log(s, AV_LOG_ERROR, "Invalid time base %d/%d\n",
531 codec->time_base.num, codec->time_base.den);
534 codec->width = avio_rb16(pb);
535 codec->height = avio_rb16(pb);
536 codec->gop_size = avio_rb16(pb);
537 codec->pix_fmt = avio_rb32(pb);
538 codec->qmin = avio_r8(pb);
539 codec->qmax = avio_r8(pb);
540 codec->max_qdiff = avio_r8(pb);
541 codec->qcompress = avio_rb16(pb) / 10000.0;
542 codec->qblur = avio_rb16(pb) / 10000.0;
543 codec->bit_rate_tolerance = avio_rb32(pb);
544 avio_get_str(pb, INT_MAX, rc_eq_buf, sizeof(rc_eq_buf));
545 codec->rc_eq = av_strdup(rc_eq_buf);
546 codec->rc_max_rate = avio_rb32(pb);
547 codec->rc_min_rate = avio_rb32(pb);
548 codec->rc_buffer_size = avio_rb32(pb);
549 codec->i_quant_factor = av_int2double(avio_rb64(pb));
550 codec->b_quant_factor = av_int2double(avio_rb64(pb));
551 codec->i_quant_offset = av_int2double(avio_rb64(pb));
552 codec->b_quant_offset = av_int2double(avio_rb64(pb));
553 codec->dct_algo = avio_rb32(pb);
554 codec->strict_std_compliance = avio_rb32(pb);
555 codec->max_b_frames = avio_rb32(pb);
556 codec->mpeg_quant = avio_rb32(pb);
557 codec->intra_dc_precision = avio_rb32(pb);
558 codec->me_method = avio_rb32(pb);
559 codec->mb_decision = avio_rb32(pb);
560 codec->nsse_weight = avio_rb32(pb);
561 codec->frame_skip_cmp = avio_rb32(pb);
562 codec->rc_buffer_aggressivity = av_int2double(avio_rb64(pb));
563 codec->codec_tag = avio_rb32(pb);
564 codec->thread_count = avio_r8(pb);
565 codec->coder_type = avio_rb32(pb);
566 codec->me_cmp = avio_rb32(pb);
567 codec->me_subpel_quality = avio_rb32(pb);
568 codec->me_range = avio_rb32(pb);
569 codec->keyint_min = avio_rb32(pb);
570 codec->scenechange_threshold = avio_rb32(pb);
571 codec->b_frame_strategy = avio_rb32(pb);
572 codec->qcompress = av_int2double(avio_rb64(pb));
573 codec->qblur = av_int2double(avio_rb64(pb));
574 codec->max_qdiff = avio_rb32(pb);
575 codec->refs = avio_rb32(pb);
577 case AVMEDIA_TYPE_AUDIO:
578 codec->sample_rate = avio_rb32(pb);
579 codec->channels = avio_rl16(pb);
580 codec->frame_size = avio_rl16(pb);
585 if (codec->flags & AV_CODEC_FLAG_GLOBAL_HEADER) {
586 if (ff_get_extradata(codec, pb, avio_rb32(pb)) < 0)
587 return AVERROR(ENOMEM);
591 /* get until end of block reached */
592 while ((avio_tell(pb) % ffm->packet_size) != 0 && !pb->eof_reached)
595 /* init packet demux */
596 ffm->packet_ptr = ffm->packet;
597 ffm->packet_end = ffm->packet;
598 ffm->frame_offset = 0;
600 ffm->read_state = READ_HEADER;
601 ffm->first_packet = 1;
608 /* return < 0 if eof */
609 static int ffm_read_packet(AVFormatContext *s, AVPacket *pkt)
612 FFMContext *ffm = s->priv_data;
615 switch(ffm->read_state) {
617 if ((ret = ffm_is_avail_data(s, FRAME_HEADER_SIZE+4)) < 0)
620 ff_dlog(s, "pos=%08"PRIx64" spos=%"PRIx64", write_index=%"PRIx64" size=%"PRIx64"\n",
621 avio_tell(s->pb), s->pb->pos, ffm->write_index, ffm->file_size);
622 if (ffm_read_data(s, ffm->header, FRAME_HEADER_SIZE, 1) !=
625 if (ffm->header[1] & FLAG_DTS)
626 if (ffm_read_data(s, ffm->header+16, 4, 1) != 4)
628 ffm->read_state = READ_DATA;
631 size = AV_RB24(ffm->header + 2);
632 if ((ret = ffm_is_avail_data(s, size)) < 0)
635 duration = AV_RB24(ffm->header + 5);
637 if (av_new_packet(pkt, size) < 0) {
638 return AVERROR(ENOMEM);
640 pkt->stream_index = ffm->header[0];
641 if ((unsigned)pkt->stream_index >= s->nb_streams) {
642 av_log(s, AV_LOG_ERROR, "invalid stream index %d\n", pkt->stream_index);
643 av_packet_unref(pkt);
644 ffm->read_state = READ_HEADER;
647 pkt->pos = avio_tell(s->pb);
648 if (ffm->header[1] & FLAG_KEY_FRAME)
649 pkt->flags |= AV_PKT_FLAG_KEY;
651 ffm->read_state = READ_HEADER;
652 if (ffm_read_data(s, pkt->data, size, 0) != size) {
653 /* bad case: desynchronized packet. we cancel all the packet loading */
654 av_packet_unref(pkt);
657 pkt->pts = AV_RB64(ffm->header+8);
658 if (ffm->header[1] & FLAG_DTS)
659 pkt->dts = pkt->pts - AV_RB32(ffm->header+16);
662 pkt->duration = duration;
668 /* seek to a given time in the file. The file read pointer is
669 positioned at or before pts. XXX: the following code is quite
671 static int ffm_seek(AVFormatContext *s, int stream_index, int64_t wanted_pts, int flags)
673 FFMContext *ffm = s->priv_data;
674 int64_t pos_min, pos_max, pos;
675 int64_t pts_min, pts_max, pts;
678 ff_dlog(s, "wanted_pts=%0.6f\n", wanted_pts / 1000000.0);
679 /* find the position using linear interpolation (better than
680 dichotomy in typical cases) */
681 if (ffm->write_index && ffm->write_index < ffm->file_size) {
682 if (get_dts(s, FFM_PACKET_SIZE) < wanted_pts) {
683 pos_min = FFM_PACKET_SIZE;
684 pos_max = ffm->write_index - FFM_PACKET_SIZE;
686 pos_min = ffm->write_index;
687 pos_max = ffm->file_size - FFM_PACKET_SIZE;
690 pos_min = FFM_PACKET_SIZE;
691 pos_max = ffm->file_size - FFM_PACKET_SIZE;
693 while (pos_min <= pos_max) {
694 pts_min = get_dts(s, pos_min);
695 pts_max = get_dts(s, pos_max);
696 if (pts_min > wanted_pts || pts_max <= wanted_pts) {
697 pos = pts_min > wanted_pts ? pos_min : pos_max;
700 /* linear interpolation */
701 pos1 = (double)(pos_max - pos_min) * (double)(wanted_pts - pts_min) /
702 (double)(pts_max - pts_min);
703 pos = (((int64_t)pos1) / FFM_PACKET_SIZE) * FFM_PACKET_SIZE;
706 else if (pos >= pos_max)
708 pts = get_dts(s, pos);
709 /* check if we are lucky */
710 if (pts == wanted_pts) {
712 } else if (pts > wanted_pts) {
713 pos_max = pos - FFM_PACKET_SIZE;
715 pos_min = pos + FFM_PACKET_SIZE;
718 pos = (flags & AVSEEK_FLAG_BACKWARD) ? pos_min : pos_max;
721 if (ffm_seek1(s, pos) < 0)
724 /* reset read state */
725 ffm->read_state = READ_HEADER;
726 ffm->packet_ptr = ffm->packet;
727 ffm->packet_end = ffm->packet;
728 ffm->first_packet = 1;
733 static int ffm_probe(AVProbeData *p)
736 p->buf[0] == 'F' && p->buf[1] == 'F' && p->buf[2] == 'M' &&
737 (p->buf[3] == '1' || p->buf[3] == '2'))
738 return AVPROBE_SCORE_MAX + 1;
742 static const AVOption options[] = {
743 {"server_attached", NULL, offsetof(FFMContext, server_attached), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, AV_OPT_FLAG_EXPORT },
744 {"ffm_write_index", NULL, offsetof(FFMContext, write_index), AV_OPT_TYPE_INT64, {.i64 = 0}, 0, 1, AV_OPT_FLAG_EXPORT },
745 {"ffm_file_size", NULL, offsetof(FFMContext, file_size), AV_OPT_TYPE_INT64, {.i64 = 0}, 0, 1, AV_OPT_FLAG_EXPORT },
749 static const AVClass ffm_class = {
750 .class_name = "ffm demuxer",
751 .item_name = av_default_item_name,
753 .version = LIBAVUTIL_VERSION_INT,
755 AVInputFormat ff_ffm_demuxer = {
757 .long_name = NULL_IF_CONFIG_SMALL("FFM (FFserver live feed)"),
758 .priv_data_size = sizeof(FFMContext),
759 .read_probe = ffm_probe,
760 .read_header = ffm_read_header,
761 .read_packet = ffm_read_packet,
762 .read_close = ffm_close,
763 .read_seek = ffm_seek,
764 .priv_class = &ffm_class,