3 * Copyright (c) 2000, 2001, 2002 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
23 #include "avio_internal.h"
27 /*********************************************/
30 #define MAX_SYNC_SIZE 100000
32 static int check_pes(const uint8_t *p, const uint8_t *end)
35 int pes2 = (p[3] & 0xC0) == 0x80 &&
36 (p[4] & 0xC0) != 0x40 &&
37 ((p[4] & 0xC0) == 0x00 ||
38 (p[4] & 0xC0) >> 2 == (p[6] & 0xF0));
40 for (p += 3; p < end && *p == 0xFF; p++) ;
41 if ((*p & 0xC0) == 0x40)
44 if ((*p & 0xF0) == 0x20)
45 pes1 = p[0] & p[2] & p[4] & 1;
46 else if ((*p & 0xF0) == 0x30)
47 pes1 = p[0] & p[2] & p[4] & p[5] & p[7] & p[9] & 1;
54 static int check_pack_header(const uint8_t *buf)
56 return (buf[1] & 0xC0) == 0x40 || (buf[1] & 0xF0) == 0x20;
59 static int mpegps_probe(const AVProbeData *p)
63 int sys = 0, pspack = 0, priv1 = 0, vid = 0;
64 int audio = 0, invalid = 0, score = 0;
67 for (i = 0; i < p->buf_size; i++) {
68 code = (code << 8) + p->buf[i];
69 if ((code & 0xffffff00) == 0x100) {
70 int len = p->buf[i + 1] << 8 | p->buf[i + 2];
71 int pes = endpes <= i && check_pes(p->buf + i, p->buf + p->buf_size);
72 int pack = check_pack_header(p->buf + i);
74 if (code == SYSTEM_HEADER_START_CODE)
76 else if (code == PACK_START_CODE && pack)
78 else if ((code & 0xf0) == VIDEO_ID && pes) {
82 // skip pes payload to avoid start code emulation for private
84 else if ((code & 0xe0) == AUDIO_ID && pes) {audio++; i+=len;}
85 else if (code == PRIVATE_STREAM_1 && pes) {priv1++; i+=len;}
86 else if (code == 0x1fd && pes) vid++; //VC1
88 else if ((code & 0xf0) == VIDEO_ID && !pes) invalid++;
89 else if ((code & 0xe0) == AUDIO_ID && !pes) invalid++;
90 else if (code == PRIVATE_STREAM_1 && !pes) invalid++;
94 if (vid + audio > invalid + 1) /* invalid VDR files nd short PES streams */
95 score = AVPROBE_SCORE_EXTENSION / 2;
97 // av_log(NULL, AV_LOG_ERROR, "vid:%d aud:%d sys:%d pspack:%d invalid:%d size:%d \n",
98 // vid, audio, sys, pspack, invalid, p->buf_size);
100 if (sys > invalid && sys * 9 <= pspack * 10)
101 return (audio > 12 || vid > 3 || pspack > 2) ? AVPROBE_SCORE_EXTENSION + 2
102 : AVPROBE_SCORE_EXTENSION / 2 + 1; // 1 more than mp3
103 if (pspack > invalid && (priv1 + vid + audio) * 10 >= pspack * 9)
104 return pspack > 2 ? AVPROBE_SCORE_EXTENSION + 2
105 : AVPROBE_SCORE_EXTENSION / 2; // 1 more than .mpg
106 if ((!!vid ^ !!audio) && (audio > 4 || vid > 1) && !sys &&
107 !pspack && p->buf_size > 2048 && vid + audio > invalid) /* PES stream */
108 return (audio > 12 || vid > 6 + 2 * invalid) ? AVPROBE_SCORE_EXTENSION + 2
109 : AVPROBE_SCORE_EXTENSION / 2;
111 // 02-Penguin.flac has sys:0 priv1:0 pspack:0 vid:0 audio:1
112 // mp3_misidentified_2.mp3 has sys:0 priv1:0 pspack:0 vid:0 audio:6
113 // Have\ Yourself\ a\ Merry\ Little\ Christmas.mp3 0 0 0 5 0 1 len:21618
117 typedef struct MpegDemuxContext {
118 int32_t header_state;
119 unsigned char psm_es_type[256];
126 static int mpegps_read_header(AVFormatContext *s)
128 MpegDemuxContext *m = s->priv_data;
129 char buffer[7] = { 0 };
130 int64_t last_pos = avio_tell(s->pb);
132 m->header_state = 0xff;
133 s->ctx_flags |= AVFMTCTX_NOHEADER;
135 avio_get_str(s->pb, 6, buffer, sizeof(buffer));
136 if (!memcmp("IMKH", buffer, 4)) {
138 } else if (!memcmp("Sofdec", buffer, 6)) {
141 avio_seek(s->pb, last_pos, SEEK_SET);
143 /* no need to do more */
147 static int64_t get_pts(AVIOContext *pb, int c)
151 buf[0] = c < 0 ? avio_r8(pb) : c;
152 avio_read(pb, buf + 1, 4);
154 return ff_parse_pes_pts(buf);
157 static int find_next_start_code(AVIOContext *pb, int *size_ptr,
158 int32_t *header_state)
160 unsigned int state, v;
163 state = *header_state;
170 if (state == 0x000001) {
171 state = ((state << 8) | v) & 0xffffff;
175 state = ((state << 8) | v) & 0xffffff;
180 *header_state = state;
186 * Extract stream types from a program stream map
187 * According to ISO/IEC 13818-1 ('MPEG-2 Systems') table 2-35
189 * @return number of bytes occupied by PSM in the bitstream
191 static long mpegps_psm_parse(MpegDemuxContext *m, AVIOContext *pb)
193 int psm_length, ps_info_length, es_map_length;
195 psm_length = avio_rb16(pb);
198 ps_info_length = avio_rb16(pb);
200 /* skip program_stream_info */
201 avio_skip(pb, ps_info_length);
202 /*es_map_length = */avio_rb16(pb);
203 /* Ignore es_map_length, trust psm_length */
204 es_map_length = psm_length - ps_info_length - 10;
206 /* at least one es available? */
207 while (es_map_length >= 4) {
208 unsigned char type = avio_r8(pb);
209 unsigned char es_id = avio_r8(pb);
210 uint16_t es_info_length = avio_rb16(pb);
212 /* remember mapping from stream id to stream type */
213 m->psm_es_type[es_id] = type;
214 /* skip program_stream_info */
215 avio_skip(pb, es_info_length);
216 es_map_length -= 4 + es_info_length;
218 avio_rb32(pb); /* crc32 */
219 return 2 + psm_length;
222 /* read the next PES header. Return its position in ppos
223 * (if not NULL), and its start code, pts and dts.
225 static int mpegps_read_pes_header(AVFormatContext *s,
226 int64_t *ppos, int *pstart_code,
227 int64_t *ppts, int64_t *pdts)
229 MpegDemuxContext *m = s->priv_data;
230 int len, size, startcode, c, flags, header_len;
231 int pes_ext, ext2_len, id_ext, skip;
233 int64_t last_sync = avio_tell(s->pb);
236 avio_seek(s->pb, last_sync, SEEK_SET);
238 /* next start code (should be immediately after) */
239 m->header_state = 0xff;
240 size = MAX_SYNC_SIZE;
241 startcode = find_next_start_code(s->pb, &size, &m->header_state);
242 last_sync = avio_tell(s->pb);
244 if (avio_feof(s->pb))
246 // FIXME we should remember header_state
250 if (startcode == PACK_START_CODE)
252 if (startcode == SYSTEM_HEADER_START_CODE)
254 if (startcode == PADDING_STREAM) {
255 avio_skip(s->pb, avio_rb16(s->pb));
258 if (startcode == PRIVATE_STREAM_2) {
260 /* Need to detect whether this from a DVD or a 'Sofdec' stream */
261 int len = avio_rb16(s->pb);
263 uint8_t *ps2buf = av_malloc(len);
266 bytesread = avio_read(s->pb, ps2buf, len);
268 if (bytesread != len) {
269 avio_skip(s->pb, len - bytesread);
273 p = memchr(ps2buf, 'S', len - 5);
276 m->sofdec = !memcmp(p+1, "ofdec", 5);
278 m->sofdec -= !m->sofdec;
281 if (len == 980 && ps2buf[0] == 0) {
283 uint32_t startpts = AV_RB32(ps2buf + 0x0d);
284 uint32_t endpts = AV_RB32(ps2buf + 0x11);
285 uint8_t hours = ((ps2buf[0x19] >> 4) * 10) + (ps2buf[0x19] & 0x0f);
286 uint8_t mins = ((ps2buf[0x1a] >> 4) * 10) + (ps2buf[0x1a] & 0x0f);
287 uint8_t secs = ((ps2buf[0x1b] >> 4) * 10) + (ps2buf[0x1b] & 0x0f);
289 m->dvd = (hours <= 23 &&
292 (ps2buf[0x19] & 0x0f) < 10 &&
293 (ps2buf[0x1a] & 0x0f) < 10 &&
294 (ps2buf[0x1b] & 0x0f) < 10 &&
296 } else if (len == 1018 && ps2buf[0] == 1) {
298 uint8_t hours = ((ps2buf[0x1d] >> 4) * 10) + (ps2buf[0x1d] & 0x0f);
299 uint8_t mins = ((ps2buf[0x1e] >> 4) * 10) + (ps2buf[0x1e] & 0x0f);
300 uint8_t secs = ((ps2buf[0x1f] >> 4) * 10) + (ps2buf[0x1f] & 0x0f);
302 m->dvd = (hours <= 23 &&
305 (ps2buf[0x1d] & 0x0f) < 10 &&
306 (ps2buf[0x1e] & 0x0f) < 10 &&
307 (ps2buf[0x1f] & 0x0f) < 10);
314 /* If this isn't a DVD packet or no memory
315 * could be allocated, just ignore it.
316 * If we did, move back to the start of the
317 * packet (plus 'length' field) */
318 if (!m->dvd || avio_skip(s->pb, -(len + 2)) < 0) {
320 * This packet will be lost but that can't be helped
321 * if we can't skip back
327 avio_skip(s->pb, len);
330 } else if (!m->dvd) {
331 int len = avio_rb16(s->pb);
332 avio_skip(s->pb, len);
336 if (startcode == PROGRAM_STREAM_MAP) {
337 mpegps_psm_parse(m, s->pb);
341 /* find matching stream */
342 if (!((startcode >= 0x1c0 && startcode <= 0x1df) ||
343 (startcode >= 0x1e0 && startcode <= 0x1ef) ||
344 (startcode == 0x1bd) ||
345 (startcode == PRIVATE_STREAM_2) ||
346 (startcode == 0x1fd)))
349 *ppos = avio_tell(s->pb) - 4;
351 len = avio_rb16(s->pb);
353 dts = AV_NOPTS_VALUE;
354 if (startcode != PRIVATE_STREAM_2)
362 /* XXX: for MPEG-1, should test only bit 7 */
366 if ((c & 0xc0) == 0x40) {
367 /* buffer scale & size */
372 if ((c & 0xe0) == 0x20) {
374 pts = get_pts(s->pb, c);
377 dts = get_pts(s->pb, -1);
380 } else if ((c & 0xc0) == 0x80) {
382 flags = avio_r8(s->pb);
383 header_len = avio_r8(s->pb);
385 if (header_len > len)
389 dts = pts = get_pts(s->pb, -1);
392 dts = get_pts(s->pb, -1);
396 if (flags & 0x3f && header_len == 0) {
398 av_log(s, AV_LOG_WARNING, "Further flags set but no bytes left\n");
400 if (flags & 0x01) { /* PES extension */
401 pes_ext = avio_r8(s->pb);
403 /* Skip PES private data, program packet sequence counter
404 * and P-STD buffer */
405 skip = (pes_ext >> 4) & 0xb;
407 if (pes_ext & 0x40 || skip > header_len) {
408 av_log(s, AV_LOG_WARNING, "pes_ext %X is invalid\n", pes_ext);
411 avio_skip(s->pb, skip);
414 if (pes_ext & 0x01) { /* PES extension 2 */
415 ext2_len = avio_r8(s->pb);
417 if ((ext2_len & 0x7f) > 0) {
418 id_ext = avio_r8(s->pb);
419 if ((id_ext & 0x80) == 0)
420 startcode = ((startcode & 0xff) << 8) | id_ext;
427 avio_skip(s->pb, header_len);
432 if (startcode == PRIVATE_STREAM_1) {
433 int ret = ffio_ensure_seekback(s->pb, 2);
438 startcode = avio_r8(s->pb);
440 if (startcode == 0x0b) {
441 if (avio_r8(s->pb) == 0x77) {
444 avio_skip(s->pb, -2);
446 avio_skip(s->pb, -1);
454 if (dts != AV_NOPTS_VALUE && ppos) {
456 for (i = 0; i < s->nb_streams; i++) {
457 if (startcode == s->streams[i]->id &&
458 (s->pb->seekable & AVIO_SEEKABLE_NORMAL) /* index useless on streams anyway */) {
459 ff_reduce_index(s, i);
460 av_add_index_entry(s->streams[i], *ppos, dts, 0, 0,
461 AVINDEX_KEYFRAME /* FIXME keyframe? */);
466 *pstart_code = startcode;
472 static int mpegps_read_packet(AVFormatContext *s,
475 MpegDemuxContext *m = s->priv_data;
477 int len, startcode, i, es_type, ret;
479 int request_probe= 0;
480 enum AVCodecID codec_id = AV_CODEC_ID_NONE;
481 enum AVMediaType type;
482 int64_t pts, dts, dummy_pos; // dummy_pos is needed for the index building to work
485 len = mpegps_read_pes_header(s, &dummy_pos, &startcode, &pts, &dts);
489 if (startcode >= 0x80 && startcode <= 0xcf) {
494 /* audio: skip header */
497 if (startcode >= 0xb0 && startcode <= 0xbf) {
498 /* MLP/TrueHD audio has a 4-byte header */
501 } else if (startcode >= 0xa0 && startcode <= 0xaf) {
502 ret = ffio_ensure_seekback(s->pb, 3);
505 pcm_dvd = (avio_rb24(s->pb) & 0xFF) == 0x80;
506 avio_skip(s->pb, -3);
511 /* now find stream */
512 for (i = 0; i < s->nb_streams; i++) {
514 if (st->id == startcode)
518 es_type = m->psm_es_type[startcode & 0xff];
519 if (es_type == STREAM_TYPE_VIDEO_MPEG1) {
520 codec_id = AV_CODEC_ID_MPEG2VIDEO;
521 type = AVMEDIA_TYPE_VIDEO;
522 } else if (es_type == STREAM_TYPE_VIDEO_MPEG2) {
523 codec_id = AV_CODEC_ID_MPEG2VIDEO;
524 type = AVMEDIA_TYPE_VIDEO;
525 } else if (es_type == STREAM_TYPE_AUDIO_MPEG1 ||
526 es_type == STREAM_TYPE_AUDIO_MPEG2) {
527 codec_id = AV_CODEC_ID_MP3;
528 type = AVMEDIA_TYPE_AUDIO;
529 } else if (es_type == STREAM_TYPE_AUDIO_AAC) {
530 codec_id = AV_CODEC_ID_AAC;
531 type = AVMEDIA_TYPE_AUDIO;
532 } else if (es_type == STREAM_TYPE_VIDEO_MPEG4) {
533 codec_id = AV_CODEC_ID_MPEG4;
534 type = AVMEDIA_TYPE_VIDEO;
535 } else if (es_type == STREAM_TYPE_VIDEO_H264) {
536 codec_id = AV_CODEC_ID_H264;
537 type = AVMEDIA_TYPE_VIDEO;
538 } else if (es_type == STREAM_TYPE_VIDEO_HEVC) {
539 codec_id = AV_CODEC_ID_HEVC;
540 type = AVMEDIA_TYPE_VIDEO;
541 } else if (es_type == STREAM_TYPE_AUDIO_AC3) {
542 codec_id = AV_CODEC_ID_AC3;
543 type = AVMEDIA_TYPE_AUDIO;
544 } else if (m->imkh_cctv && es_type == 0x91) {
545 codec_id = AV_CODEC_ID_PCM_MULAW;
546 type = AVMEDIA_TYPE_AUDIO;
547 } else if (startcode >= 0x1e0 && startcode <= 0x1ef) {
548 static const unsigned char avs_seqh[4] = { 0, 0, 1, 0xb0 };
549 unsigned char buf[8];
551 avio_read(s->pb, buf, 8);
552 avio_seek(s->pb, -8, SEEK_CUR);
553 if (!memcmp(buf, avs_seqh, 4) && (buf[6] != 0 || buf[7] != 1))
554 codec_id = AV_CODEC_ID_CAVS;
557 type = AVMEDIA_TYPE_VIDEO;
558 } else if (startcode == PRIVATE_STREAM_2) {
559 type = AVMEDIA_TYPE_DATA;
560 codec_id = AV_CODEC_ID_DVD_NAV;
561 } else if (startcode >= 0x1c0 && startcode <= 0x1df) {
562 type = AVMEDIA_TYPE_AUDIO;
564 codec_id = AV_CODEC_ID_ADPCM_ADX;
567 } else if (m->imkh_cctv && startcode == 0x1c0 && len > 80) {
568 codec_id = AV_CODEC_ID_PCM_ALAW;
571 codec_id = AV_CODEC_ID_MP2;
575 } else if (startcode >= 0x80 && startcode <= 0x87) {
576 type = AVMEDIA_TYPE_AUDIO;
577 codec_id = AV_CODEC_ID_AC3;
578 } else if ((startcode >= 0x88 && startcode <= 0x8f) ||
579 (startcode >= 0x98 && startcode <= 0x9f)) {
580 /* 0x90 - 0x97 is reserved for SDDS in DVD specs */
581 type = AVMEDIA_TYPE_AUDIO;
582 codec_id = AV_CODEC_ID_DTS;
583 } else if (startcode >= 0xa0 && startcode <= 0xaf) {
584 type = AVMEDIA_TYPE_AUDIO;
586 codec_id = AV_CODEC_ID_MLP;
588 codec_id = AV_CODEC_ID_PCM_DVD;
590 } else if (startcode >= 0xb0 && startcode <= 0xbf) {
591 type = AVMEDIA_TYPE_AUDIO;
592 codec_id = AV_CODEC_ID_TRUEHD;
593 } else if (startcode >= 0xc0 && startcode <= 0xcf) {
594 /* Used for both AC-3 and E-AC-3 in EVOB files */
595 type = AVMEDIA_TYPE_AUDIO;
596 codec_id = AV_CODEC_ID_AC3;
597 } else if (startcode >= 0x20 && startcode <= 0x3f) {
598 type = AVMEDIA_TYPE_SUBTITLE;
599 codec_id = AV_CODEC_ID_DVD_SUBTITLE;
600 } else if (startcode >= 0xfd55 && startcode <= 0xfd5f) {
601 type = AVMEDIA_TYPE_VIDEO;
602 codec_id = AV_CODEC_ID_VC1;
606 avio_skip(s->pb, len);
609 /* no stream found: add a new stream */
610 st = avformat_new_stream(s, NULL);
614 st->codecpar->codec_type = type;
615 st->codecpar->codec_id = codec_id;
616 if ( st->codecpar->codec_id == AV_CODEC_ID_PCM_MULAW
617 || st->codecpar->codec_id == AV_CODEC_ID_PCM_ALAW) {
618 st->codecpar->channels = 1;
619 st->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
620 st->codecpar->sample_rate = 8000;
622 st->request_probe = request_probe;
623 st->need_parsing = AVSTREAM_PARSE_FULL;
626 if (st->discard >= AVDISCARD_ALL)
628 if (startcode >= 0xa0 && startcode <= 0xaf) {
629 if (st->codecpar->codec_id == AV_CODEC_ID_MLP) {
636 ret = av_get_packet(s->pb, pkt, len);
640 pkt->pos = dummy_pos;
641 pkt->stream_index = st->index;
643 if (s->debug & FF_FDEBUG_TS)
644 av_log(s, AV_LOG_DEBUG, "%d: pts=%0.3f dts=%0.3f size=%d\n",
645 pkt->stream_index, pkt->pts / 90000.0, pkt->dts / 90000.0,
648 return (ret < 0) ? ret : 0;
651 static int64_t mpegps_read_dts(AVFormatContext *s, int stream_index,
652 int64_t *ppos, int64_t pos_limit)
655 int64_t pos, pts, dts;
658 if (avio_seek(s->pb, pos, SEEK_SET) < 0)
659 return AV_NOPTS_VALUE;
662 len = mpegps_read_pes_header(s, &pos, &startcode, &pts, &dts);
664 if (s->debug & FF_FDEBUG_TS)
665 av_log(s, AV_LOG_DEBUG, "none (ret=%d)\n", len);
666 return AV_NOPTS_VALUE;
668 if (startcode == s->streams[stream_index]->id &&
669 dts != AV_NOPTS_VALUE) {
672 avio_skip(s->pb, len);
674 if (s->debug & FF_FDEBUG_TS)
675 av_log(s, AV_LOG_DEBUG, "pos=0x%"PRIx64" dts=0x%"PRIx64" %0.3f\n",
676 pos, dts, dts / 90000.0);
681 AVInputFormat ff_mpegps_demuxer = {
683 .long_name = NULL_IF_CONFIG_SMALL("MPEG-PS (MPEG-2 Program Stream)"),
684 .priv_data_size = sizeof(MpegDemuxContext),
685 .read_probe = mpegps_probe,
686 .read_header = mpegps_read_header,
687 .read_packet = mpegps_read_packet,
688 .read_timestamp = mpegps_read_dts,
689 .flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT,
692 #if CONFIG_VOBSUB_DEMUXER
694 #include "subtitles.h"
695 #include "libavutil/avassert.h"
696 #include "libavutil/bprint.h"
697 #include "libavutil/opt.h"
699 #define REF_STRING "# VobSub index file,"
700 #define MAX_LINE_SIZE 2048
702 typedef struct VobSubDemuxContext {
703 const AVClass *class;
704 AVFormatContext *sub_ctx;
705 FFDemuxSubtitlesQueue q[32];
707 } VobSubDemuxContext;
709 static int vobsub_probe(const AVProbeData *p)
711 if (!strncmp(p->buf, REF_STRING, sizeof(REF_STRING) - 1))
712 return AVPROBE_SCORE_MAX;
716 static int vobsub_read_close(AVFormatContext *s)
718 VobSubDemuxContext *vobsub = s->priv_data;
721 for (i = 0; i < s->nb_streams; i++)
722 ff_subtitles_queue_clean(&vobsub->q[i]);
724 avformat_close_input(&vobsub->sub_ctx);
728 static int vobsub_read_header(AVFormatContext *s)
730 int i, ret = 0, header_parsed = 0, langidx = 0;
731 VobSubDemuxContext *vobsub = s->priv_data;
738 char alt[MAX_LINE_SIZE] = {0};
739 ff_const59 AVInputFormat *iformat;
741 if (!vobsub->sub_name) {
743 vobsub->sub_name = av_strdup(s->url);
744 if (!vobsub->sub_name) {
745 return AVERROR(ENOMEM);
748 fname_len = strlen(vobsub->sub_name);
749 ext = vobsub->sub_name - 3 + fname_len;
750 if (fname_len < 4 || *(ext - 1) != '.') {
751 av_log(s, AV_LOG_ERROR, "The input index filename is too short "
752 "to guess the associated .SUB file\n");
753 return AVERROR_INVALIDDATA;
755 memcpy(ext, !strncmp(ext, "IDX", 3) ? "SUB" : "sub", 3);
756 av_log(s, AV_LOG_VERBOSE, "IDX/SUB: %s -> %s\n", s->url, vobsub->sub_name);
759 if (!(iformat = av_find_input_format("mpeg"))) {
760 return AVERROR_DEMUXER_NOT_FOUND;
763 vobsub->sub_ctx = avformat_alloc_context();
764 if (!vobsub->sub_ctx) {
765 return AVERROR(ENOMEM);
768 av_bprint_init(&header, 0, INT_MAX - AV_INPUT_BUFFER_PADDING_SIZE);
770 if ((ret = ff_copy_whiteblacklists(vobsub->sub_ctx, s)) < 0)
773 ret = avformat_open_input(&vobsub->sub_ctx, vobsub->sub_name, iformat, NULL);
775 av_log(s, AV_LOG_ERROR, "Unable to open %s as MPEG subtitles\n", vobsub->sub_name);
779 while (!avio_feof(s->pb)) {
780 char line[MAX_LINE_SIZE];
781 int len = ff_get_line(s->pb, line, sizeof(line));
786 line[strcspn(line, "\r\n")] = 0;
788 if (!strncmp(line, "id:", 3)) {
789 if (sscanf(line, "id: %63[^,], index: %u", id, &stream_id) != 2) {
790 av_log(s, AV_LOG_WARNING, "Unable to parse index line '%s', "
791 "assuming 'id: und, index: 0'\n", line);
796 if (stream_id >= FF_ARRAY_ELEMS(vobsub->q)) {
797 av_log(s, AV_LOG_ERROR, "Maximum number of subtitles streams reached\n");
798 ret = AVERROR(EINVAL);
804 /* We do not create the stream immediately to avoid adding empty
805 * streams. See the following timestamp entry. */
807 av_log(s, AV_LOG_DEBUG, "IDX stream[%d] id=%s\n", stream_id, id);
809 } else if (!strncmp(line, "timestamp:", 10)) {
812 int64_t pos, timestamp;
813 const char *p = line + 10;
815 if (stream_id == -1) {
816 av_log(s, AV_LOG_ERROR, "Timestamp declared before any stream\n");
817 ret = AVERROR_INVALIDDATA;
821 if (!st || st->id != stream_id) {
822 st = avformat_new_stream(s, NULL);
824 ret = AVERROR(ENOMEM);
828 st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
829 st->codecpar->codec_id = AV_CODEC_ID_DVD_SUBTITLE;
830 avpriv_set_pts_info(st, 64, 1, 1000);
831 av_dict_set(&st->metadata, "language", id, 0);
833 av_dict_set(&st->metadata, "title", alt, 0);
836 if (sscanf(p, "%02d:%02d:%02d:%03d, filepos: %"SCNx64,
837 &hh, &mm, &ss, &ms, &pos) != 5) {
838 av_log(s, AV_LOG_ERROR, "Unable to parse timestamp line '%s', "
839 "abort parsing\n", line);
840 ret = AVERROR_INVALIDDATA;
843 timestamp = (hh*3600LL + mm*60LL + ss) * 1000LL + ms + delay;
844 timestamp = av_rescale_q(timestamp, av_make_q(1, 1000), st->time_base);
846 sub = ff_subtitles_queue_insert(&vobsub->q[s->nb_streams - 1], "", 0, 0);
848 ret = AVERROR(ENOMEM);
852 sub->pts = timestamp;
853 sub->stream_index = s->nb_streams - 1;
855 } else if (!strncmp(line, "alt:", 4)) {
856 const char *p = line + 4;
860 av_log(s, AV_LOG_DEBUG, "IDX stream[%d] name=%s\n", stream_id, p);
861 av_strlcpy(alt, p, sizeof(alt));
864 } else if (!strncmp(line, "delay:", 6)) {
865 int sign = 1, hh = 0, mm = 0, ss = 0, ms = 0;
866 const char *p = line + 6;
870 if (*p == '-' || *p == '+') {
871 sign = *p == '-' ? -1 : 1;
874 sscanf(p, "%d:%d:%d:%d", &hh, &mm, &ss, &ms);
875 delay = ((hh*3600LL + mm*60LL + ss) * 1000LL + ms) * sign;
877 } else if (!strncmp(line, "langidx:", 8)) {
878 const char *p = line + 8;
880 if (sscanf(p, "%d", &langidx) != 1)
881 av_log(s, AV_LOG_ERROR, "Invalid langidx specified\n");
883 } else if (!header_parsed) {
884 if (line[0] && line[0] != '#')
885 av_bprintf(&header, "%s\n", line);
889 if (langidx < s->nb_streams)
890 s->streams[langidx]->disposition |= AV_DISPOSITION_DEFAULT;
892 for (i = 0; i < s->nb_streams; i++) {
893 vobsub->q[i].sort = SUB_SORT_POS_TS;
894 vobsub->q[i].keep_duplicates = 1;
895 ff_subtitles_queue_finalize(s, &vobsub->q[i]);
898 if (!av_bprint_is_complete(&header)) {
899 ret = AVERROR(ENOMEM);
902 for (i = 0; i < s->nb_streams; i++) {
903 AVCodecParameters *par = s->streams[i]->codecpar;
904 ret = ff_alloc_extradata(par, header.len);
908 memcpy(par->extradata, header.str, header.len);
912 vobsub_read_close(s);
913 av_bprint_finalize(&header, NULL);
917 static int vobsub_read_packet(AVFormatContext *s, AVPacket *pkt)
919 VobSubDemuxContext *vobsub = s->priv_data;
920 FFDemuxSubtitlesQueue *q;
921 AVIOContext *pb = vobsub->sub_ctx->pb;
922 int ret, psize, total_read = 0, i;
924 int64_t min_ts = INT64_MAX;
926 for (i = 0; i < s->nb_streams; i++) {
927 FFDemuxSubtitlesQueue *tmpq = &vobsub->q[i];
929 av_assert0(tmpq->nb_subs);
930 ts = tmpq->subs[tmpq->current_sub_idx].pts;
937 /* The returned packet will have size zero,
938 * so that it can be directly used with av_grow_packet. */
939 ret = ff_subtitles_queue_read_packet(q, pkt);
943 /* compute maximum packet size using the next packet position. This is
944 * useful when the len in the header is non-sense */
945 if (q->current_sub_idx < q->nb_subs) {
946 psize = q->subs[q->current_sub_idx].pos - pkt->pos;
948 int64_t fsize = avio_size(pb);
949 psize = fsize < 0 ? 0xffff : fsize - pkt->pos;
952 avio_seek(pb, pkt->pos, SEEK_SET);
955 int n, to_read, startcode;
957 int64_t old_pos = avio_tell(pb), new_pos;
960 ret = mpegps_read_pes_header(vobsub->sub_ctx, NULL, &startcode, &pts, &dts);
962 if (pkt->size) // raise packet even if incomplete
966 to_read = ret & 0xffff;
967 new_pos = avio_tell(pb);
968 pkt_size = ret + (new_pos - old_pos);
970 /* this prevents reads above the current packet */
971 if (total_read + pkt_size > psize)
973 total_read += pkt_size;
975 /* the current chunk doesn't match the stream index (unlikely) */
976 if ((startcode & 0x1f) != s->streams[pkt->stream_index]->id)
979 ret = av_grow_packet(pkt, to_read);
983 n = avio_read(pb, pkt->data + (pkt->size - to_read), to_read);
985 pkt->size -= to_read - n;
986 } while (total_read < psize);
991 av_packet_unref(pkt);
995 static int vobsub_read_seek(AVFormatContext *s, int stream_index,
996 int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
998 VobSubDemuxContext *vobsub = s->priv_data;
1000 /* Rescale requested timestamps based on the first stream (timebase is the
1001 * same for all subtitles stream within a .idx/.sub). Rescaling is done just
1002 * like in avformat_seek_file(). */
1003 if (stream_index == -1 && s->nb_streams != 1) {
1005 AVRational time_base = s->streams[0]->time_base;
1006 ts = av_rescale_q(ts, AV_TIME_BASE_Q, time_base);
1007 min_ts = av_rescale_rnd(min_ts, time_base.den,
1008 time_base.num * (int64_t)AV_TIME_BASE,
1009 AV_ROUND_UP | AV_ROUND_PASS_MINMAX);
1010 max_ts = av_rescale_rnd(max_ts, time_base.den,
1011 time_base.num * (int64_t)AV_TIME_BASE,
1012 AV_ROUND_DOWN | AV_ROUND_PASS_MINMAX);
1013 for (i = 0; i < s->nb_streams; i++) {
1014 int r = ff_subtitles_queue_seek(&vobsub->q[i], s, stream_index,
1015 min_ts, ts, max_ts, flags);
1022 if (stream_index == -1) // only 1 stream
1024 return ff_subtitles_queue_seek(&vobsub->q[stream_index], s, stream_index,
1025 min_ts, ts, max_ts, flags);
1028 static const AVOption options[] = {
1029 { "sub_name", "URI for .sub file", offsetof(VobSubDemuxContext, sub_name), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, AV_OPT_FLAG_DECODING_PARAM },
1033 static const AVClass vobsub_demuxer_class = {
1034 .class_name = "vobsub",
1035 .item_name = av_default_item_name,
1037 .version = LIBAVUTIL_VERSION_INT,
1040 AVInputFormat ff_vobsub_demuxer = {
1042 .long_name = NULL_IF_CONFIG_SMALL("VobSub subtitle format"),
1043 .priv_data_size = sizeof(VobSubDemuxContext),
1044 .read_probe = vobsub_probe,
1045 .read_header = vobsub_read_header,
1046 .read_packet = vobsub_read_packet,
1047 .read_seek2 = vobsub_read_seek,
1048 .read_close = vobsub_read_close,
1049 .flags = AVFMT_SHOW_IDS,
1050 .extensions = "idx",
1051 .priv_class = &vobsub_demuxer_class,