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
26 #if CONFIG_VOBSUB_DEMUXER
27 # include "subtitles.h"
28 # include "libavutil/bprint.h"
33 #include "libavutil/avassert.h"
35 /*********************************************/
38 #define MAX_SYNC_SIZE 100000
40 static int check_pes(const uint8_t *p, const uint8_t *end){
42 int pes2= (p[3] & 0xC0) == 0x80
43 && (p[4] & 0xC0) != 0x40
44 &&((p[4] & 0xC0) == 0x00 || (p[4]&0xC0)>>2 == (p[6]&0xF0));
46 for(p+=3; p<end && *p == 0xFF; p++);
47 if((*p&0xC0) == 0x40) p+=2;
48 if((*p&0xF0) == 0x20){
49 pes1= p[0]&p[2]&p[4]&1;
50 }else if((*p&0xF0) == 0x30){
51 pes1= p[0]&p[2]&p[4]&p[5]&p[7]&p[9]&1;
58 static int check_pack_header(const uint8_t *buf) {
59 return (buf[1] & 0xC0) == 0x40 || (buf[1] & 0xF0) == 0x20;
62 static int mpegps_probe(AVProbeData *p)
65 int sys=0, pspack=0, priv1=0, vid=0, audio=0, invalid=0;
69 for(i=0; i<p->buf_size; i++){
70 code = (code<<8) + p->buf[i];
71 if ((code & 0xffffff00) == 0x100) {
72 int len= p->buf[i+1] << 8 | p->buf[i+2];
73 int pes= check_pes(p->buf+i, p->buf+p->buf_size);
74 int pack = check_pack_header(p->buf+i);
76 if(code == SYSTEM_HEADER_START_CODE) sys++;
77 else if(code == PACK_START_CODE && pack) pspack++;
78 else if((code & 0xf0) == VIDEO_ID && pes) vid++;
79 // skip pes payload to avoid start code emulation for private
81 else if((code & 0xe0) == AUDIO_ID && pes) {audio++; i+=len;}
82 else if(code == PRIVATE_STREAM_1 && pes) {priv1++; i+=len;}
83 else if(code == 0x1fd && pes) vid++; //VC1
85 else if((code & 0xf0) == VIDEO_ID && !pes) invalid++;
86 else if((code & 0xe0) == AUDIO_ID && !pes) invalid++;
87 else if(code == PRIVATE_STREAM_1 && !pes) invalid++;
91 if(vid+audio > invalid+1) /* invalid VDR files nd short PES streams */
92 score = AVPROBE_SCORE_EXTENSION / 2;
94 if(sys>invalid && sys*9 <= pspack*10)
95 return (audio > 12 || vid > 3 || pspack > 2) ? AVPROBE_SCORE_EXTENSION + 2 : AVPROBE_SCORE_EXTENSION / 2; // 1 more than .mpg
96 if(pspack > invalid && (priv1+vid+audio)*10 >= pspack*9)
97 return pspack > 2 ? AVPROBE_SCORE_EXTENSION + 2 : AVPROBE_SCORE_EXTENSION / 2; // 1 more than .mpg
98 if((!!vid ^ !!audio) && (audio > 4 || vid > 1) && !sys && !pspack && p->buf_size>2048 && vid + audio > invalid) /* PES stream */
99 return (audio > 12 || vid > 3 + 2*invalid) ? AVPROBE_SCORE_EXTENSION + 2 : AVPROBE_SCORE_EXTENSION / 2;
101 //02-Penguin.flac has sys:0 priv1:0 pspack:0 vid:0 audio:1
102 //mp3_misidentified_2.mp3 has sys:0 priv1:0 pspack:0 vid:0 audio:6
103 //Have\ Yourself\ a\ Merry\ Little\ Christmas.mp3 0 0 0 5 0 1 len:21618
108 typedef struct MpegDemuxContext {
109 int32_t header_state;
110 unsigned char psm_es_type[256];
114 #if CONFIG_VOBSUB_DEMUXER
115 AVFormatContext *sub_ctx;
116 FFDemuxSubtitlesQueue q;
120 static int mpegps_read_header(AVFormatContext *s)
122 MpegDemuxContext *m = s->priv_data;
124 int64_t last_pos = avio_tell(s->pb);
126 m->header_state = 0xff;
127 s->ctx_flags |= AVFMTCTX_NOHEADER;
129 avio_get_str(s->pb, 6, buffer, sizeof(buffer));
130 if (!memcmp("IMKH", buffer, 4)) {
132 } else if (!memcmp("Sofdec", buffer, 6)) {
135 avio_seek(s->pb, last_pos, SEEK_SET);
137 /* no need to do more */
141 static int64_t get_pts(AVIOContext *pb, int c)
145 buf[0] = c<0 ? avio_r8(pb) : c;
146 avio_read(pb, buf+1, 4);
148 return ff_parse_pes_pts(buf);
151 static int find_next_start_code(AVIOContext *pb, int *size_ptr,
152 int32_t *header_state)
154 unsigned int state, v;
157 state = *header_state;
164 if (state == 0x000001) {
165 state = ((state << 8) | v) & 0xffffff;
169 state = ((state << 8) | v) & 0xffffff;
173 *header_state = state;
179 * Extract stream types from a program stream map
180 * According to ISO/IEC 13818-1 ('MPEG-2 Systems') table 2-35
182 * @return number of bytes occupied by PSM in the bitstream
184 static long mpegps_psm_parse(MpegDemuxContext *m, AVIOContext *pb)
186 int psm_length, ps_info_length, es_map_length;
188 psm_length = avio_rb16(pb);
191 ps_info_length = avio_rb16(pb);
193 /* skip program_stream_info */
194 avio_skip(pb, ps_info_length);
195 es_map_length = avio_rb16(pb);
197 /* at least one es available? */
198 while (es_map_length >= 4){
199 unsigned char type = avio_r8(pb);
200 unsigned char es_id = avio_r8(pb);
201 uint16_t es_info_length = avio_rb16(pb);
202 /* remember mapping from stream id to stream type */
203 m->psm_es_type[es_id] = type;
204 /* skip program_stream_info */
205 avio_skip(pb, es_info_length);
206 es_map_length -= 4 + es_info_length;
208 avio_rb32(pb); /* crc32 */
209 return 2 + psm_length;
212 /* read the next PES header. Return its position in ppos
213 (if not NULL), and its start code, pts and dts.
215 static int mpegps_read_pes_header(AVFormatContext *s,
216 int64_t *ppos, int *pstart_code,
217 int64_t *ppts, int64_t *pdts)
219 MpegDemuxContext *m = s->priv_data;
220 int len, size, startcode, c, flags, header_len;
221 int pes_ext, ext2_len, id_ext, skip;
223 int64_t last_sync= avio_tell(s->pb);
226 avio_seek(s->pb, last_sync, SEEK_SET);
228 /* next start code (should be immediately after) */
229 m->header_state = 0xff;
230 size = MAX_SYNC_SIZE;
231 startcode = find_next_start_code(s->pb, &size, &m->header_state);
232 last_sync = avio_tell(s->pb);
236 //FIXME we should remember header_state
237 return AVERROR(EAGAIN);
240 if (startcode == PACK_START_CODE)
242 if (startcode == SYSTEM_HEADER_START_CODE)
244 if (startcode == PADDING_STREAM) {
245 avio_skip(s->pb, avio_rb16(s->pb));
248 if (startcode == PRIVATE_STREAM_2) {
250 /* Need to detect whether this from a DVD or a 'Sofdec' stream */
251 int len = avio_rb16(s->pb);
253 uint8_t *ps2buf = av_malloc(len);
256 bytesread = avio_read(s->pb, ps2buf, len);
258 if (bytesread != len) {
259 avio_skip(s->pb, len - bytesread);
263 p = memchr(ps2buf, 'S', len - 5);
266 m->sofdec = !memcmp(p+1, "ofdec", 5);
268 m->sofdec -= !m->sofdec;
271 if (len == 980 && ps2buf[0] == 0) {
273 uint32_t startpts = AV_RB32(ps2buf + 0x0d);
274 uint32_t endpts = AV_RB32(ps2buf + 0x11);
275 uint8_t hours = ((ps2buf[0x19] >> 4) * 10) + (ps2buf[0x19] & 0x0f);
276 uint8_t mins = ((ps2buf[0x1a] >> 4) * 10) + (ps2buf[0x1a] & 0x0f);
277 uint8_t secs = ((ps2buf[0x1b] >> 4) * 10) + (ps2buf[0x1b] & 0x0f);
279 m->dvd = (hours <= 23 &&
282 (ps2buf[0x19] & 0x0f) < 10 &&
283 (ps2buf[0x1a] & 0x0f) < 10 &&
284 (ps2buf[0x1b] & 0x0f) < 10 &&
286 } else if (len == 1018 && ps2buf[0] == 1) {
288 uint8_t hours = ((ps2buf[0x1d] >> 4) * 10) + (ps2buf[0x1d] & 0x0f);
289 uint8_t mins = ((ps2buf[0x1e] >> 4) * 10) + (ps2buf[0x1e] & 0x0f);
290 uint8_t secs = ((ps2buf[0x1f] >> 4) * 10) + (ps2buf[0x1f] & 0x0f);
292 m->dvd = (hours <= 23 &&
295 (ps2buf[0x1d] & 0x0f) < 10 &&
296 (ps2buf[0x1e] & 0x0f) < 10 &&
297 (ps2buf[0x1f] & 0x0f) < 10);
304 /* If this isn't a DVD packet or no memory
305 * could be allocated, just ignore it.
306 * If we did, move back to the start of the
307 * packet (plus 'length' field) */
308 if (!m->dvd || avio_skip(s->pb, -(len + 2)) < 0) {
310 * This packet will be lost but that can't be helped
311 * if we can't skip back
317 avio_skip(s->pb, len);
320 } else if (!m->dvd) {
321 int len = avio_rb16(s->pb);
322 avio_skip(s->pb, len);
326 if (startcode == PROGRAM_STREAM_MAP) {
327 mpegps_psm_parse(m, s->pb);
331 /* find matching stream */
332 if (!((startcode >= 0x1c0 && startcode <= 0x1df) ||
333 (startcode >= 0x1e0 && startcode <= 0x1ef) ||
334 (startcode == 0x1bd) ||
335 (startcode == PRIVATE_STREAM_2) ||
336 (startcode == 0x1fd)))
339 *ppos = avio_tell(s->pb) - 4;
341 len = avio_rb16(s->pb);
343 dts = AV_NOPTS_VALUE;
344 if (startcode != PRIVATE_STREAM_2)
352 /* XXX: for mpeg1, should test only bit 7 */
356 if ((c & 0xc0) == 0x40) {
357 /* buffer scale & size */
362 if ((c & 0xe0) == 0x20) {
363 dts = pts = get_pts(s->pb, c);
366 dts = get_pts(s->pb, -1);
369 } else if ((c & 0xc0) == 0x80) {
371 flags = avio_r8(s->pb);
372 header_len = avio_r8(s->pb);
374 if (header_len > len)
378 dts = pts = get_pts(s->pb, -1);
381 dts = get_pts(s->pb, -1);
385 if (flags & 0x3f && header_len == 0){
387 av_log(s, AV_LOG_WARNING, "Further flags set but no bytes left\n");
389 if (flags & 0x01) { /* PES extension */
390 pes_ext = avio_r8(s->pb);
392 /* Skip PES private data, program packet sequence counter and P-STD buffer */
393 skip = (pes_ext >> 4) & 0xb;
395 if (pes_ext & 0x40 || skip > header_len){
396 av_log(s, AV_LOG_WARNING, "pes_ext %X is invalid\n", pes_ext);
399 avio_skip(s->pb, skip);
402 if (pes_ext & 0x01) { /* PES extension 2 */
403 ext2_len = avio_r8(s->pb);
405 if ((ext2_len & 0x7f) > 0) {
406 id_ext = avio_r8(s->pb);
407 if ((id_ext & 0x80) == 0)
408 startcode = ((startcode & 0xff) << 8) | id_ext;
415 avio_skip(s->pb, header_len);
421 if (startcode == PRIVATE_STREAM_1) {
422 startcode = avio_r8(s->pb);
427 if(dts != AV_NOPTS_VALUE && ppos){
429 for(i=0; i<s->nb_streams; i++){
430 if(startcode == s->streams[i]->id &&
431 s->pb->seekable /* index useless on streams anyway */) {
432 ff_reduce_index(s, i);
433 av_add_index_entry(s->streams[i], *ppos, dts, 0, 0, AVINDEX_KEYFRAME /* FIXME keyframe? */);
438 *pstart_code = startcode;
444 static int mpegps_read_packet(AVFormatContext *s,
447 MpegDemuxContext *m = s->priv_data;
449 int len, startcode, i, es_type, ret;
450 int lpcm_header_len = -1; //Init to supress warning
451 int request_probe= 0;
452 enum AVCodecID codec_id = AV_CODEC_ID_NONE;
453 enum AVMediaType type;
454 int64_t pts, dts, dummy_pos; //dummy_pos is needed for the index building to work
457 len = mpegps_read_pes_header(s, &dummy_pos, &startcode, &pts, &dts);
461 if (startcode >= 0x80 && startcode <= 0xcf) {
465 /* audio: skip header */
467 lpcm_header_len = avio_rb16(s->pb);
469 if (startcode >= 0xb0 && startcode <= 0xbf) {
470 /* MLP/TrueHD audio has a 4-byte header */
476 /* now find stream */
477 for(i=0;i<s->nb_streams;i++) {
479 if (st->id == startcode)
483 es_type = m->psm_es_type[startcode & 0xff];
484 if(es_type == STREAM_TYPE_VIDEO_MPEG1){
485 codec_id = AV_CODEC_ID_MPEG2VIDEO;
486 type = AVMEDIA_TYPE_VIDEO;
487 } else if(es_type == STREAM_TYPE_VIDEO_MPEG2){
488 codec_id = AV_CODEC_ID_MPEG2VIDEO;
489 type = AVMEDIA_TYPE_VIDEO;
490 } else if(es_type == STREAM_TYPE_AUDIO_MPEG1 ||
491 es_type == STREAM_TYPE_AUDIO_MPEG2){
492 codec_id = AV_CODEC_ID_MP3;
493 type = AVMEDIA_TYPE_AUDIO;
494 } else if(es_type == STREAM_TYPE_AUDIO_AAC){
495 codec_id = AV_CODEC_ID_AAC;
496 type = AVMEDIA_TYPE_AUDIO;
497 } else if(es_type == STREAM_TYPE_VIDEO_MPEG4){
498 codec_id = AV_CODEC_ID_MPEG4;
499 type = AVMEDIA_TYPE_VIDEO;
500 } else if(es_type == STREAM_TYPE_VIDEO_H264){
501 codec_id = AV_CODEC_ID_H264;
502 type = AVMEDIA_TYPE_VIDEO;
503 } else if(es_type == STREAM_TYPE_AUDIO_AC3){
504 codec_id = AV_CODEC_ID_AC3;
505 type = AVMEDIA_TYPE_AUDIO;
506 } else if(m->imkh_cctv && es_type == 0x91){
507 codec_id = AV_CODEC_ID_PCM_MULAW;
508 type = AVMEDIA_TYPE_AUDIO;
509 } else if (startcode >= 0x1e0 && startcode <= 0x1ef) {
510 static const unsigned char avs_seqh[4] = { 0, 0, 1, 0xb0 };
511 unsigned char buf[8];
512 avio_read(s->pb, buf, 8);
513 avio_seek(s->pb, -8, SEEK_CUR);
514 if(!memcmp(buf, avs_seqh, 4) && (buf[6] != 0 || buf[7] != 1))
515 codec_id = AV_CODEC_ID_CAVS;
518 type = AVMEDIA_TYPE_VIDEO;
519 } else if (startcode == PRIVATE_STREAM_2) {
520 type = AVMEDIA_TYPE_DATA;
521 codec_id = AV_CODEC_ID_DVD_NAV;
522 } else if (startcode >= 0x1c0 && startcode <= 0x1df) {
523 type = AVMEDIA_TYPE_AUDIO;
524 codec_id = m->sofdec > 0 ? AV_CODEC_ID_ADPCM_ADX : AV_CODEC_ID_MP2;
525 } else if (startcode >= 0x80 && startcode <= 0x87) {
526 type = AVMEDIA_TYPE_AUDIO;
527 codec_id = AV_CODEC_ID_AC3;
528 } else if ( ( startcode >= 0x88 && startcode <= 0x8f)
529 ||( startcode >= 0x98 && startcode <= 0x9f)) {
530 /* 0x90 - 0x97 is reserved for SDDS in DVD specs */
531 type = AVMEDIA_TYPE_AUDIO;
532 codec_id = AV_CODEC_ID_DTS;
533 } else if (startcode >= 0xa0 && startcode <= 0xaf) {
534 type = AVMEDIA_TYPE_AUDIO;
535 if(lpcm_header_len == 6) {
536 codec_id = AV_CODEC_ID_MLP;
538 codec_id = AV_CODEC_ID_PCM_DVD;
540 } else if (startcode >= 0xb0 && startcode <= 0xbf) {
541 type = AVMEDIA_TYPE_AUDIO;
542 codec_id = AV_CODEC_ID_TRUEHD;
543 } else if (startcode >= 0xc0 && startcode <= 0xcf) {
544 /* Used for both AC-3 and E-AC-3 in EVOB files */
545 type = AVMEDIA_TYPE_AUDIO;
546 codec_id = AV_CODEC_ID_AC3;
547 } else if (startcode >= 0x20 && startcode <= 0x3f) {
548 type = AVMEDIA_TYPE_SUBTITLE;
549 codec_id = AV_CODEC_ID_DVD_SUBTITLE;
550 } else if (startcode >= 0xfd55 && startcode <= 0xfd5f) {
551 type = AVMEDIA_TYPE_VIDEO;
552 codec_id = AV_CODEC_ID_VC1;
556 avio_skip(s->pb, len);
559 /* no stream found: add a new stream */
560 st = avformat_new_stream(s, NULL);
564 st->codec->codec_type = type;
565 st->codec->codec_id = codec_id;
566 if (st->codec->codec_id == AV_CODEC_ID_PCM_MULAW) {
567 st->codec->channels = 1;
568 st->codec->channel_layout = AV_CH_LAYOUT_MONO;
569 st->codec->sample_rate = 8000;
571 st->request_probe = request_probe;
572 st->need_parsing = AVSTREAM_PARSE_FULL;
574 if(st->discard >= AVDISCARD_ALL)
576 if (startcode >= 0xa0 && startcode <= 0xaf) {
577 if (lpcm_header_len == 6 && st->codec->codec_id == AV_CODEC_ID_MLP) {
584 ret = av_get_packet(s->pb, pkt, len);
587 pkt->pos = dummy_pos;
588 pkt->stream_index = st->index;
589 av_dlog(s, "%d: pts=%0.3f dts=%0.3f size=%d\n",
590 pkt->stream_index, pkt->pts / 90000.0, pkt->dts / 90000.0,
593 return (ret < 0) ? ret : 0;
596 static int64_t mpegps_read_dts(AVFormatContext *s, int stream_index,
597 int64_t *ppos, int64_t pos_limit)
600 int64_t pos, pts, dts;
603 if (avio_seek(s->pb, pos, SEEK_SET) < 0)
604 return AV_NOPTS_VALUE;
607 len = mpegps_read_pes_header(s, &pos, &startcode, &pts, &dts);
609 av_dlog(s, "none (ret=%d)\n", len);
610 return AV_NOPTS_VALUE;
612 if (startcode == s->streams[stream_index]->id &&
613 dts != AV_NOPTS_VALUE) {
616 avio_skip(s->pb, len);
618 av_dlog(s, "pos=0x%"PRIx64" dts=0x%"PRIx64" %0.3f\n",
619 pos, dts, dts / 90000.0);
624 AVInputFormat ff_mpegps_demuxer = {
626 .long_name = NULL_IF_CONFIG_SMALL("MPEG-PS (MPEG-2 Program Stream)"),
627 .priv_data_size = sizeof(MpegDemuxContext),
628 .read_probe = mpegps_probe,
629 .read_header = mpegps_read_header,
630 .read_packet = mpegps_read_packet,
631 .read_timestamp = mpegps_read_dts,
632 .flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT,
635 #if CONFIG_VOBSUB_DEMUXER
637 #define REF_STRING "# VobSub index file,"
639 static int vobsub_probe(AVProbeData *p)
641 if (!strncmp(p->buf, REF_STRING, sizeof(REF_STRING) - 1))
642 return AVPROBE_SCORE_MAX;
646 static int vobsub_read_header(AVFormatContext *s)
648 int i, ret = 0, header_parsed = 0, langidx = 0;
649 MpegDemuxContext *vobsub = s->priv_data;
650 char *sub_name = NULL;
652 char *ext, *header_str;
657 sub_name = av_strdup(s->filename);
658 fname_len = strlen(sub_name);
659 ext = sub_name - 3 + fname_len;
660 if (fname_len < 4 || *(ext - 1) != '.') {
661 av_log(s, AV_LOG_ERROR, "The input index filename is too short "
662 "to guess the associated .SUB file\n");
663 ret = AVERROR_INVALIDDATA;
666 memcpy(ext, !strncmp(ext, "IDX", 3) ? "SUB" : "sub", 3);
667 av_log(s, AV_LOG_VERBOSE, "IDX/SUB: %s -> %s\n", s->filename, sub_name);
668 ret = avformat_open_input(&vobsub->sub_ctx, sub_name, &ff_mpegps_demuxer, NULL);
670 av_log(s, AV_LOG_ERROR, "Unable to open %s as MPEG subtitles\n", sub_name);
674 av_bprint_init(&header, 0, AV_BPRINT_SIZE_UNLIMITED);
675 while (!url_feof(s->pb)) {
677 int len = ff_get_line(s->pb, line, sizeof(line));
682 line[strcspn(line, "\r\n")] = 0;
684 if (!strncmp(line, "id:", 3)) {
685 int n, stream_id = 0;
688 n = sscanf(line, "id: %63[^,], index: %u", id, &stream_id);
690 av_log(s, AV_LOG_WARNING, "Unable to parse index line '%s', "
691 "assuming 'id: und, index: 0'\n", line);
696 st = avformat_new_stream(s, NULL);
698 ret = AVERROR(ENOMEM);
702 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
703 st->codec->codec_id = AV_CODEC_ID_DVD_SUBTITLE;
704 avpriv_set_pts_info(st, 64, 1, 1000);
705 av_dict_set(&st->metadata, "language", id, 0);
706 av_log(s, AV_LOG_DEBUG, "IDX stream[%d] id=%s\n", stream_id, id);
709 } else if (st && !strncmp(line, "timestamp:", 10)) {
712 int64_t pos, timestamp;
713 const char *p = line + 10;
715 if (sscanf(p, "%02d:%02d:%02d:%03d, filepos: %"SCNx64,
716 &hh, &mm, &ss, &ms, &pos) != 5) {
717 av_log(s, AV_LOG_ERROR, "Unable to parse timestamp line '%s', "
718 "abort parsing\n", line);
721 timestamp = (hh*3600LL + mm*60LL + ss) * 1000LL + ms + delay;
722 timestamp = av_rescale_q(timestamp, (AVRational){1,1000}, st->time_base);
724 sub = ff_subtitles_queue_insert(&vobsub->q, "", 0, 0);
726 ret = AVERROR(ENOMEM);
730 sub->pts = timestamp;
731 sub->stream_index = s->nb_streams - 1;
733 } else if (st && !strncmp(line, "alt:", 4)) {
734 const char *p = line + 4;
738 av_dict_set(&st->metadata, "title", p, 0);
739 av_log(s, AV_LOG_DEBUG, "IDX stream[%d] name=%s\n", st->id, p);
742 } else if (!strncmp(line, "delay:", 6)) {
743 int sign = 1, hh = 0, mm = 0, ss = 0, ms = 0;
744 const char *p = line + 6;
748 if (*p == '-' || *p == '+') {
749 sign = *p == '-' ? -1 : 1;
752 sscanf(p, "%d:%d:%d:%d", &hh, &mm, &ss, &ms);
753 delay = ((hh*3600LL + mm*60LL + ss) * 1000LL + ms) * sign;
755 } else if (!strncmp(line, "langidx:", 8)) {
756 const char *p = line + 8;
758 if (sscanf(p, "%d", &langidx) != 1)
759 av_log(s, AV_LOG_ERROR, "Invalid langidx specified\n");
761 } else if (!header_parsed) {
762 if (line[0] && line[0] != '#')
763 av_bprintf(&header, "%s\n", line);
767 if (langidx < s->nb_streams)
768 s->streams[langidx]->disposition |= AV_DISPOSITION_DEFAULT;
770 ff_subtitles_queue_finalize(&vobsub->q);
772 if (!av_bprint_is_complete(&header)) {
773 av_bprint_finalize(&header, NULL);
774 ret = AVERROR(ENOMEM);
777 av_bprint_finalize(&header, &header_str);
778 for (i = 0; i < s->nb_streams; i++) {
779 AVStream *sub_st = s->streams[i];
780 sub_st->codec->extradata = av_strdup(header_str);
781 sub_st->codec->extradata_size = header.len;
790 #define FAIL(r) do { ret = r; goto fail; } while (0)
792 static int vobsub_read_packet(AVFormatContext *s, AVPacket *pkt)
794 MpegDemuxContext *vobsub = s->priv_data;
795 FFDemuxSubtitlesQueue *q = &vobsub->q;
796 AVIOContext *pb = vobsub->sub_ctx->pb;
797 int ret, psize, len16 = -1;
800 ret = ff_subtitles_queue_read_packet(q, &idx_pkt);
804 /* compute maximum packet size using the next packet position. This is
805 * useful when the len in the header is non-sense */
806 if (q->current_sub_idx < q->nb_subs) {
807 psize = q->subs[q->current_sub_idx].pos - idx_pkt.pos;
809 int64_t fsize = avio_size(pb);
810 psize = fsize < 0 ? 0xffff : fsize - idx_pkt.pos;
813 avio_seek(pb, idx_pkt.pos, SEEK_SET);
820 int n, to_read, startcode;
823 ret = mpegps_read_pes_header(vobsub->sub_ctx, NULL, &startcode, &pts, &dts);
826 to_read = ret & 0xffff;
828 /* this prevents reads above the current packet */
829 if (pkt->size + to_read > psize)
832 /* if the len is computed, we check for overread */
833 if (len16 != -1 && pkt->size + to_read > len16)
836 /* the current chunk doesn't match the stream index (unlikely) */
837 if ((startcode & 0x1f) != idx_pkt.stream_index)
840 ret = av_grow_packet(pkt, to_read);
844 n = avio_read(pb, pkt->data + (pkt->size - to_read), to_read);
846 pkt->size -= to_read - n;
848 /* first chunk contains the total len of the packet to raise */
849 if (len16 == -1 && n > 2)
850 len16 = AV_RB16(pkt->data);
851 } while (len16 != -1 && pkt->size != len16);
853 pkt->pts = pkt->dts = idx_pkt.pts;
854 pkt->pos = idx_pkt.pos;
855 pkt->stream_index = idx_pkt.stream_index;
857 av_free_packet(&idx_pkt);
861 av_free_packet(&idx_pkt);
865 static int vobsub_read_seek(AVFormatContext *s, int stream_index,
866 int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
868 MpegDemuxContext *vobsub = s->priv_data;
870 /* Rescale requested timestamps based on the first stream (timebase is the
871 * same for all subtitles stream within a .idx/.sub). Rescaling is done just
872 * like in avformat_seek_file(). */
873 if (stream_index == -1 && s->nb_streams != 1) {
874 AVRational time_base = s->streams[0]->time_base;
875 ts = av_rescale_q(ts, AV_TIME_BASE_Q, time_base);
876 min_ts = av_rescale_rnd(min_ts, time_base.den,
877 time_base.num * (int64_t)AV_TIME_BASE,
878 AV_ROUND_UP | AV_ROUND_PASS_MINMAX);
879 max_ts = av_rescale_rnd(max_ts, time_base.den,
880 time_base.num * (int64_t)AV_TIME_BASE,
881 AV_ROUND_DOWN | AV_ROUND_PASS_MINMAX);
884 return ff_subtitles_queue_seek(&vobsub->q, s, stream_index,
885 min_ts, ts, max_ts, flags);
888 static int vobsub_read_close(AVFormatContext *s)
890 MpegDemuxContext *vobsub = s->priv_data;
891 ff_subtitles_queue_clean(&vobsub->q);
893 avformat_close_input(&vobsub->sub_ctx);
897 AVInputFormat ff_vobsub_demuxer = {
899 .long_name = NULL_IF_CONFIG_SMALL("VobSub subtitle format"),
900 .priv_data_size = sizeof(MpegDemuxContext),
901 .read_probe = vobsub_probe,
902 .read_header = vobsub_read_header,
903 .read_packet = vobsub_read_packet,
904 .read_seek2 = vobsub_read_seek,
905 .read_close = vobsub_read_close,
906 .flags = AVFMT_SHOW_IDS,