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"
31 #include "libavutil/avassert.h"
33 /*********************************************/
36 #define MAX_SYNC_SIZE 100000
38 static int check_pes(const uint8_t *p, const uint8_t *end)
41 int pes2 = (p[3] & 0xC0) == 0x80 &&
42 (p[4] & 0xC0) != 0x40 &&
43 ((p[4] & 0xC0) == 0x00 ||
44 (p[4] & 0xC0) >> 2 == (p[6] & 0xF0));
46 for (p += 3; p < end && *p == 0xFF; p++) ;
47 if ((*p & 0xC0) == 0x40)
50 if ((*p & 0xF0) == 0x20)
51 pes1 = p[0] & p[2] & p[4] & 1;
52 else if ((*p & 0xF0) == 0x30)
53 pes1 = p[0] & p[2] & p[4] & p[5] & p[7] & p[9] & 1;
60 static int check_pack_header(const uint8_t *buf)
62 return (buf[1] & 0xC0) == 0x40 || (buf[1] & 0xF0) == 0x20;
65 static int mpegps_probe(AVProbeData *p)
69 int sys = 0, pspack = 0, priv1 = 0, vid = 0;
70 int audio = 0, invalid = 0, score = 0;
73 for (i = 0; i < p->buf_size; i++) {
74 code = (code << 8) + p->buf[i];
75 if ((code & 0xffffff00) == 0x100) {
76 int len = p->buf[i + 1] << 8 | p->buf[i + 2];
77 int pes = endpes <= i && check_pes(p->buf + i, p->buf + p->buf_size);
78 int pack = check_pack_header(p->buf + i);
80 if (code == SYSTEM_HEADER_START_CODE)
82 else if (code == PACK_START_CODE && pack)
84 else if ((code & 0xf0) == VIDEO_ID && pes) {
88 // skip pes payload to avoid start code emulation for private
90 else if ((code & 0xe0) == AUDIO_ID && pes) {audio++; i+=len;}
91 else if (code == PRIVATE_STREAM_1 && pes) {priv1++; i+=len;}
92 else if (code == 0x1fd && pes) vid++; //VC1
94 else if ((code & 0xf0) == VIDEO_ID && !pes) invalid++;
95 else if ((code & 0xe0) == AUDIO_ID && !pes) invalid++;
96 else if (code == PRIVATE_STREAM_1 && !pes) invalid++;
100 if (vid + audio > invalid + 1) /* invalid VDR files nd short PES streams */
101 score = AVPROBE_SCORE_EXTENSION / 2;
103 // av_log(NULL, AV_LOG_ERROR, "vid:%d aud:%d sys:%d pspack:%d invalid:%d size:%d \n",
104 // vid, audio, sys, pspack, invalid, p->buf_size);
106 if (sys > invalid && sys * 9 <= pspack * 10)
107 return (audio > 12 || vid > 3 || pspack > 2) ? AVPROBE_SCORE_EXTENSION + 2
108 : AVPROBE_SCORE_EXTENSION / 2 + 1; // 1 more than mp3
109 if (pspack > invalid && (priv1 + vid + audio) * 10 >= pspack * 9)
110 return pspack > 2 ? AVPROBE_SCORE_EXTENSION + 2
111 : AVPROBE_SCORE_EXTENSION / 2; // 1 more than .mpg
112 if ((!!vid ^ !!audio) && (audio > 4 || vid > 1) && !sys &&
113 !pspack && p->buf_size > 2048 && vid + audio > invalid) /* PES stream */
114 return (audio > 12 || vid > 3 + 2 * invalid) ? AVPROBE_SCORE_EXTENSION + 2
115 : AVPROBE_SCORE_EXTENSION / 2;
117 // 02-Penguin.flac has sys:0 priv1:0 pspack:0 vid:0 audio:1
118 // mp3_misidentified_2.mp3 has sys:0 priv1:0 pspack:0 vid:0 audio:6
119 // Have\ Yourself\ a\ Merry\ Little\ Christmas.mp3 0 0 0 5 0 1 len:21618
123 typedef struct MpegDemuxContext {
124 int32_t header_state;
125 unsigned char psm_es_type[256];
129 #if CONFIG_VOBSUB_DEMUXER
130 AVFormatContext *sub_ctx;
131 FFDemuxSubtitlesQueue q[32];
135 static int mpegps_read_header(AVFormatContext *s)
137 MpegDemuxContext *m = s->priv_data;
139 int64_t last_pos = avio_tell(s->pb);
141 m->header_state = 0xff;
142 s->ctx_flags |= AVFMTCTX_NOHEADER;
144 avio_get_str(s->pb, 6, buffer, sizeof(buffer));
145 if (!memcmp("IMKH", buffer, 4)) {
147 } else if (!memcmp("Sofdec", buffer, 6)) {
150 avio_seek(s->pb, last_pos, SEEK_SET);
152 /* no need to do more */
156 static int64_t get_pts(AVIOContext *pb, int c)
160 buf[0] = c < 0 ? avio_r8(pb) : c;
161 avio_read(pb, buf + 1, 4);
163 return ff_parse_pes_pts(buf);
166 static int find_next_start_code(AVIOContext *pb, int *size_ptr,
167 int32_t *header_state)
169 unsigned int state, v;
172 state = *header_state;
179 if (state == 0x000001) {
180 state = ((state << 8) | v) & 0xffffff;
184 state = ((state << 8) | v) & 0xffffff;
189 *header_state = state;
195 * Extract stream types from a program stream map
196 * According to ISO/IEC 13818-1 ('MPEG-2 Systems') table 2-35
198 * @return number of bytes occupied by PSM in the bitstream
200 static long mpegps_psm_parse(MpegDemuxContext *m, AVIOContext *pb)
202 int psm_length, ps_info_length, es_map_length;
204 psm_length = avio_rb16(pb);
207 ps_info_length = avio_rb16(pb);
209 /* skip program_stream_info */
210 avio_skip(pb, ps_info_length);
211 /*es_map_length = */avio_rb16(pb);
212 /* Ignore es_map_length, trust psm_length */
213 es_map_length = psm_length - ps_info_length - 10;
215 /* at least one es available? */
216 while (es_map_length >= 4) {
217 unsigned char type = avio_r8(pb);
218 unsigned char es_id = avio_r8(pb);
219 uint16_t es_info_length = avio_rb16(pb);
221 /* remember mapping from stream id to stream type */
222 m->psm_es_type[es_id] = type;
223 /* skip program_stream_info */
224 avio_skip(pb, es_info_length);
225 es_map_length -= 4 + es_info_length;
227 avio_rb32(pb); /* crc32 */
228 return 2 + psm_length;
231 /* read the next PES header. Return its position in ppos
232 * (if not NULL), and its start code, pts and dts.
234 static int mpegps_read_pes_header(AVFormatContext *s,
235 int64_t *ppos, int *pstart_code,
236 int64_t *ppts, int64_t *pdts)
238 MpegDemuxContext *m = s->priv_data;
239 int len, size, startcode, c, flags, header_len;
240 int pes_ext, ext2_len, id_ext, skip;
242 int64_t last_sync = avio_tell(s->pb);
245 avio_seek(s->pb, last_sync, SEEK_SET);
247 /* next start code (should be immediately after) */
248 m->header_state = 0xff;
249 size = MAX_SYNC_SIZE;
250 startcode = find_next_start_code(s->pb, &size, &m->header_state);
251 last_sync = avio_tell(s->pb);
253 if (avio_feof(s->pb))
255 // FIXME we should remember header_state
256 return AVERROR(EAGAIN);
259 if (startcode == PACK_START_CODE)
261 if (startcode == SYSTEM_HEADER_START_CODE)
263 if (startcode == PADDING_STREAM) {
264 avio_skip(s->pb, avio_rb16(s->pb));
267 if (startcode == PRIVATE_STREAM_2) {
269 /* Need to detect whether this from a DVD or a 'Sofdec' stream */
270 int len = avio_rb16(s->pb);
272 uint8_t *ps2buf = av_malloc(len);
275 bytesread = avio_read(s->pb, ps2buf, len);
277 if (bytesread != len) {
278 avio_skip(s->pb, len - bytesread);
282 p = memchr(ps2buf, 'S', len - 5);
285 m->sofdec = !memcmp(p+1, "ofdec", 5);
287 m->sofdec -= !m->sofdec;
290 if (len == 980 && ps2buf[0] == 0) {
292 uint32_t startpts = AV_RB32(ps2buf + 0x0d);
293 uint32_t endpts = AV_RB32(ps2buf + 0x11);
294 uint8_t hours = ((ps2buf[0x19] >> 4) * 10) + (ps2buf[0x19] & 0x0f);
295 uint8_t mins = ((ps2buf[0x1a] >> 4) * 10) + (ps2buf[0x1a] & 0x0f);
296 uint8_t secs = ((ps2buf[0x1b] >> 4) * 10) + (ps2buf[0x1b] & 0x0f);
298 m->dvd = (hours <= 23 &&
301 (ps2buf[0x19] & 0x0f) < 10 &&
302 (ps2buf[0x1a] & 0x0f) < 10 &&
303 (ps2buf[0x1b] & 0x0f) < 10 &&
305 } else if (len == 1018 && ps2buf[0] == 1) {
307 uint8_t hours = ((ps2buf[0x1d] >> 4) * 10) + (ps2buf[0x1d] & 0x0f);
308 uint8_t mins = ((ps2buf[0x1e] >> 4) * 10) + (ps2buf[0x1e] & 0x0f);
309 uint8_t secs = ((ps2buf[0x1f] >> 4) * 10) + (ps2buf[0x1f] & 0x0f);
311 m->dvd = (hours <= 23 &&
314 (ps2buf[0x1d] & 0x0f) < 10 &&
315 (ps2buf[0x1e] & 0x0f) < 10 &&
316 (ps2buf[0x1f] & 0x0f) < 10);
323 /* If this isn't a DVD packet or no memory
324 * could be allocated, just ignore it.
325 * If we did, move back to the start of the
326 * packet (plus 'length' field) */
327 if (!m->dvd || avio_skip(s->pb, -(len + 2)) < 0) {
329 * This packet will be lost but that can't be helped
330 * if we can't skip back
336 avio_skip(s->pb, len);
339 } else if (!m->dvd) {
340 int len = avio_rb16(s->pb);
341 avio_skip(s->pb, len);
345 if (startcode == PROGRAM_STREAM_MAP) {
346 mpegps_psm_parse(m, s->pb);
350 /* find matching stream */
351 if (!((startcode >= 0x1c0 && startcode <= 0x1df) ||
352 (startcode >= 0x1e0 && startcode <= 0x1ef) ||
353 (startcode == 0x1bd) ||
354 (startcode == PRIVATE_STREAM_2) ||
355 (startcode == 0x1fd)))
358 *ppos = avio_tell(s->pb) - 4;
360 len = avio_rb16(s->pb);
362 dts = AV_NOPTS_VALUE;
363 if (startcode != PRIVATE_STREAM_2)
371 /* XXX: for mpeg1, should test only bit 7 */
375 if ((c & 0xc0) == 0x40) {
376 /* buffer scale & size */
381 if ((c & 0xe0) == 0x20) {
383 pts = get_pts(s->pb, c);
386 dts = get_pts(s->pb, -1);
389 } else if ((c & 0xc0) == 0x80) {
391 flags = avio_r8(s->pb);
392 header_len = avio_r8(s->pb);
394 if (header_len > len)
398 dts = pts = get_pts(s->pb, -1);
401 dts = get_pts(s->pb, -1);
405 if (flags & 0x3f && header_len == 0) {
407 av_log(s, AV_LOG_WARNING, "Further flags set but no bytes left\n");
409 if (flags & 0x01) { /* PES extension */
410 pes_ext = avio_r8(s->pb);
412 /* Skip PES private data, program packet sequence counter
413 * and P-STD buffer */
414 skip = (pes_ext >> 4) & 0xb;
416 if (pes_ext & 0x40 || skip > header_len) {
417 av_log(s, AV_LOG_WARNING, "pes_ext %X is invalid\n", pes_ext);
420 avio_skip(s->pb, skip);
423 if (pes_ext & 0x01) { /* PES extension 2 */
424 ext2_len = avio_r8(s->pb);
426 if ((ext2_len & 0x7f) > 0) {
427 id_ext = avio_r8(s->pb);
428 if ((id_ext & 0x80) == 0)
429 startcode = ((startcode & 0xff) << 8) | id_ext;
436 avio_skip(s->pb, header_len);
441 if (startcode == PRIVATE_STREAM_1) {
442 startcode = avio_r8(s->pb);
447 if (dts != AV_NOPTS_VALUE && ppos) {
449 for (i = 0; i < s->nb_streams; i++) {
450 if (startcode == s->streams[i]->id &&
451 s->pb->seekable /* index useless on streams anyway */) {
452 ff_reduce_index(s, i);
453 av_add_index_entry(s->streams[i], *ppos, dts, 0, 0,
454 AVINDEX_KEYFRAME /* FIXME keyframe? */);
459 *pstart_code = startcode;
465 static int mpegps_read_packet(AVFormatContext *s,
468 MpegDemuxContext *m = s->priv_data;
470 int len, startcode, i, es_type, ret;
471 int lpcm_header_len = -1; //Init to suppress warning
472 int request_probe= 0;
473 enum AVCodecID codec_id = AV_CODEC_ID_NONE;
474 enum AVMediaType type;
475 int64_t pts, dts, dummy_pos; // dummy_pos is needed for the index building to work
478 len = mpegps_read_pes_header(s, &dummy_pos, &startcode, &pts, &dts);
482 if (startcode >= 0x80 && startcode <= 0xcf) {
486 /* audio: skip header */
488 lpcm_header_len = avio_rb16(s->pb);
490 if (startcode >= 0xb0 && startcode <= 0xbf) {
491 /* MLP/TrueHD audio has a 4-byte header */
497 /* now find stream */
498 for (i = 0; i < s->nb_streams; i++) {
500 if (st->id == startcode)
504 es_type = m->psm_es_type[startcode & 0xff];
505 if (es_type == STREAM_TYPE_VIDEO_MPEG1) {
506 codec_id = AV_CODEC_ID_MPEG2VIDEO;
507 type = AVMEDIA_TYPE_VIDEO;
508 } else if (es_type == STREAM_TYPE_VIDEO_MPEG2) {
509 codec_id = AV_CODEC_ID_MPEG2VIDEO;
510 type = AVMEDIA_TYPE_VIDEO;
511 } else if (es_type == STREAM_TYPE_AUDIO_MPEG1 ||
512 es_type == STREAM_TYPE_AUDIO_MPEG2) {
513 codec_id = AV_CODEC_ID_MP3;
514 type = AVMEDIA_TYPE_AUDIO;
515 } else if (es_type == STREAM_TYPE_AUDIO_AAC) {
516 codec_id = AV_CODEC_ID_AAC;
517 type = AVMEDIA_TYPE_AUDIO;
518 } else if (es_type == STREAM_TYPE_VIDEO_MPEG4) {
519 codec_id = AV_CODEC_ID_MPEG4;
520 type = AVMEDIA_TYPE_VIDEO;
521 } else if (es_type == STREAM_TYPE_VIDEO_H264) {
522 codec_id = AV_CODEC_ID_H264;
523 type = AVMEDIA_TYPE_VIDEO;
524 } else if (es_type == STREAM_TYPE_AUDIO_AC3) {
525 codec_id = AV_CODEC_ID_AC3;
526 type = AVMEDIA_TYPE_AUDIO;
527 } else if (m->imkh_cctv && es_type == 0x91) {
528 codec_id = AV_CODEC_ID_PCM_MULAW;
529 type = AVMEDIA_TYPE_AUDIO;
530 } else if (startcode >= 0x1e0 && startcode <= 0x1ef) {
531 static const unsigned char avs_seqh[4] = { 0, 0, 1, 0xb0 };
532 unsigned char buf[8];
534 avio_read(s->pb, buf, 8);
535 avio_seek(s->pb, -8, SEEK_CUR);
536 if (!memcmp(buf, avs_seqh, 4) && (buf[6] != 0 || buf[7] != 1))
537 codec_id = AV_CODEC_ID_CAVS;
540 type = AVMEDIA_TYPE_VIDEO;
541 } else if (startcode == PRIVATE_STREAM_2) {
542 type = AVMEDIA_TYPE_DATA;
543 codec_id = AV_CODEC_ID_DVD_NAV;
544 } else if (startcode >= 0x1c0 && startcode <= 0x1df) {
545 type = AVMEDIA_TYPE_AUDIO;
547 codec_id = AV_CODEC_ID_ADPCM_ADX;
551 codec_id = AV_CODEC_ID_MP2;
553 } else if (startcode >= 0x80 && startcode <= 0x87) {
554 type = AVMEDIA_TYPE_AUDIO;
555 codec_id = AV_CODEC_ID_AC3;
556 } else if ((startcode >= 0x88 && startcode <= 0x8f) ||
557 (startcode >= 0x98 && startcode <= 0x9f)) {
558 /* 0x90 - 0x97 is reserved for SDDS in DVD specs */
559 type = AVMEDIA_TYPE_AUDIO;
560 codec_id = AV_CODEC_ID_DTS;
561 } else if (startcode >= 0xa0 && startcode <= 0xaf) {
562 type = AVMEDIA_TYPE_AUDIO;
563 if (lpcm_header_len == 6) {
564 codec_id = AV_CODEC_ID_MLP;
566 codec_id = AV_CODEC_ID_PCM_DVD;
568 } else if (startcode >= 0xb0 && startcode <= 0xbf) {
569 type = AVMEDIA_TYPE_AUDIO;
570 codec_id = AV_CODEC_ID_TRUEHD;
571 } else if (startcode >= 0xc0 && startcode <= 0xcf) {
572 /* Used for both AC-3 and E-AC-3 in EVOB files */
573 type = AVMEDIA_TYPE_AUDIO;
574 codec_id = AV_CODEC_ID_AC3;
575 } else if (startcode >= 0x20 && startcode <= 0x3f) {
576 type = AVMEDIA_TYPE_SUBTITLE;
577 codec_id = AV_CODEC_ID_DVD_SUBTITLE;
578 } else if (startcode >= 0xfd55 && startcode <= 0xfd5f) {
579 type = AVMEDIA_TYPE_VIDEO;
580 codec_id = AV_CODEC_ID_VC1;
584 avio_skip(s->pb, len);
587 /* no stream found: add a new stream */
588 st = avformat_new_stream(s, NULL);
592 st->codec->codec_type = type;
593 st->codec->codec_id = codec_id;
594 if (st->codec->codec_id == AV_CODEC_ID_PCM_MULAW) {
595 st->codec->channels = 1;
596 st->codec->channel_layout = AV_CH_LAYOUT_MONO;
597 st->codec->sample_rate = 8000;
599 st->request_probe = request_probe;
600 st->need_parsing = AVSTREAM_PARSE_FULL;
603 if (st->discard >= AVDISCARD_ALL)
605 if (startcode >= 0xa0 && startcode <= 0xaf) {
606 if (lpcm_header_len == 6 && st->codec->codec_id == AV_CODEC_ID_MLP) {
613 ret = av_get_packet(s->pb, pkt, len);
617 pkt->pos = dummy_pos;
618 pkt->stream_index = st->index;
619 av_dlog(s, "%d: pts=%0.3f dts=%0.3f size=%d\n",
620 pkt->stream_index, pkt->pts / 90000.0, pkt->dts / 90000.0,
623 return (ret < 0) ? ret : 0;
626 static int64_t mpegps_read_dts(AVFormatContext *s, int stream_index,
627 int64_t *ppos, int64_t pos_limit)
630 int64_t pos, pts, dts;
633 if (avio_seek(s->pb, pos, SEEK_SET) < 0)
634 return AV_NOPTS_VALUE;
637 len = mpegps_read_pes_header(s, &pos, &startcode, &pts, &dts);
639 av_dlog(s, "none (ret=%d)\n", len);
640 return AV_NOPTS_VALUE;
642 if (startcode == s->streams[stream_index]->id &&
643 dts != AV_NOPTS_VALUE) {
646 avio_skip(s->pb, len);
648 av_dlog(s, "pos=0x%"PRIx64" dts=0x%"PRIx64" %0.3f\n",
649 pos, dts, dts / 90000.0);
654 AVInputFormat ff_mpegps_demuxer = {
656 .long_name = NULL_IF_CONFIG_SMALL("MPEG-PS (MPEG-2 Program Stream)"),
657 .priv_data_size = sizeof(MpegDemuxContext),
658 .read_probe = mpegps_probe,
659 .read_header = mpegps_read_header,
660 .read_packet = mpegps_read_packet,
661 .read_timestamp = mpegps_read_dts,
662 .flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT,
665 #if CONFIG_VOBSUB_DEMUXER
667 #define REF_STRING "# VobSub index file,"
668 #define MAX_LINE_SIZE 2048
670 static int vobsub_probe(AVProbeData *p)
672 if (!strncmp(p->buf, REF_STRING, sizeof(REF_STRING) - 1))
673 return AVPROBE_SCORE_MAX;
677 static int vobsub_read_header(AVFormatContext *s)
679 int i, ret = 0, header_parsed = 0, langidx = 0;
680 MpegDemuxContext *vobsub = s->priv_data;
681 char *sub_name = NULL;
683 char *ext, *header_str;
689 char alt[MAX_LINE_SIZE] = {0};
690 AVInputFormat *iformat;
692 sub_name = av_strdup(s->filename);
693 fname_len = strlen(sub_name);
694 ext = sub_name - 3 + fname_len;
695 if (fname_len < 4 || *(ext - 1) != '.') {
696 av_log(s, AV_LOG_ERROR, "The input index filename is too short "
697 "to guess the associated .SUB file\n");
698 ret = AVERROR_INVALIDDATA;
701 memcpy(ext, !strncmp(ext, "IDX", 3) ? "SUB" : "sub", 3);
702 av_log(s, AV_LOG_VERBOSE, "IDX/SUB: %s -> %s\n", s->filename, sub_name);
704 if (!(iformat = av_find_input_format("mpeg"))) {
705 ret = AVERROR_DEMUXER_NOT_FOUND;
709 vobsub->sub_ctx = avformat_alloc_context();
710 if (!vobsub->sub_ctx) {
711 ret = AVERROR(ENOMEM);
715 if ((ret = ff_copy_whitelists(vobsub->sub_ctx, s)) < 0)
718 ret = avformat_open_input(&vobsub->sub_ctx, sub_name, iformat, NULL);
720 av_log(s, AV_LOG_ERROR, "Unable to open %s as MPEG subtitles\n", sub_name);
724 av_bprint_init(&header, 0, AV_BPRINT_SIZE_UNLIMITED);
725 while (!avio_feof(s->pb)) {
726 char line[MAX_LINE_SIZE];
727 int len = ff_get_line(s->pb, line, sizeof(line));
732 line[strcspn(line, "\r\n")] = 0;
734 if (!strncmp(line, "id:", 3)) {
735 if (sscanf(line, "id: %63[^,], index: %u", id, &stream_id) != 2) {
736 av_log(s, AV_LOG_WARNING, "Unable to parse index line '%s', "
737 "assuming 'id: und, index: 0'\n", line);
742 if (stream_id >= FF_ARRAY_ELEMS(vobsub->q)) {
743 av_log(s, AV_LOG_ERROR, "Maximum number of subtitles streams reached\n");
744 ret = AVERROR(EINVAL);
750 /* We do not create the stream immediately to avoid adding empty
751 * streams. See the following timestamp entry. */
753 av_log(s, AV_LOG_DEBUG, "IDX stream[%d] id=%s\n", stream_id, id);
755 } else if (!strncmp(line, "timestamp:", 10)) {
758 int64_t pos, timestamp;
759 const char *p = line + 10;
761 if (stream_id == -1) {
762 av_log(s, AV_LOG_ERROR, "Timestamp declared before any stream\n");
763 ret = AVERROR_INVALIDDATA;
767 if (!st || st->id != stream_id) {
768 st = avformat_new_stream(s, NULL);
770 ret = AVERROR(ENOMEM);
774 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
775 st->codec->codec_id = AV_CODEC_ID_DVD_SUBTITLE;
776 avpriv_set_pts_info(st, 64, 1, 1000);
777 av_dict_set(&st->metadata, "language", id, 0);
779 av_dict_set(&st->metadata, "title", alt, 0);
782 if (sscanf(p, "%02d:%02d:%02d:%03d, filepos: %"SCNx64,
783 &hh, &mm, &ss, &ms, &pos) != 5) {
784 av_log(s, AV_LOG_ERROR, "Unable to parse timestamp line '%s', "
785 "abort parsing\n", line);
786 ret = AVERROR_INVALIDDATA;
789 timestamp = (hh*3600LL + mm*60LL + ss) * 1000LL + ms + delay;
790 timestamp = av_rescale_q(timestamp, av_make_q(1, 1000), st->time_base);
792 sub = ff_subtitles_queue_insert(&vobsub->q[s->nb_streams - 1], "", 0, 0);
794 ret = AVERROR(ENOMEM);
798 sub->pts = timestamp;
799 sub->stream_index = s->nb_streams - 1;
801 } else if (!strncmp(line, "alt:", 4)) {
802 const char *p = line + 4;
806 av_log(s, AV_LOG_DEBUG, "IDX stream[%d] name=%s\n", stream_id, p);
807 av_strlcpy(alt, p, sizeof(alt));
810 } else if (!strncmp(line, "delay:", 6)) {
811 int sign = 1, hh = 0, mm = 0, ss = 0, ms = 0;
812 const char *p = line + 6;
816 if (*p == '-' || *p == '+') {
817 sign = *p == '-' ? -1 : 1;
820 sscanf(p, "%d:%d:%d:%d", &hh, &mm, &ss, &ms);
821 delay = ((hh*3600LL + mm*60LL + ss) * 1000LL + ms) * sign;
823 } else if (!strncmp(line, "langidx:", 8)) {
824 const char *p = line + 8;
826 if (sscanf(p, "%d", &langidx) != 1)
827 av_log(s, AV_LOG_ERROR, "Invalid langidx specified\n");
829 } else if (!header_parsed) {
830 if (line[0] && line[0] != '#')
831 av_bprintf(&header, "%s\n", line);
835 if (langidx < s->nb_streams)
836 s->streams[langidx]->disposition |= AV_DISPOSITION_DEFAULT;
838 for (i = 0; i < s->nb_streams; i++) {
839 vobsub->q[i].sort = SUB_SORT_POS_TS;
840 ff_subtitles_queue_finalize(&vobsub->q[i]);
843 if (!av_bprint_is_complete(&header)) {
844 av_bprint_finalize(&header, NULL);
845 ret = AVERROR(ENOMEM);
848 av_bprint_finalize(&header, &header_str);
849 for (i = 0; i < s->nb_streams; i++) {
850 AVStream *sub_st = s->streams[i];
851 sub_st->codec->extradata = av_strdup(header_str);
852 sub_st->codec->extradata_size = header.len;
861 static int vobsub_read_packet(AVFormatContext *s, AVPacket *pkt)
863 MpegDemuxContext *vobsub = s->priv_data;
864 FFDemuxSubtitlesQueue *q;
865 AVIOContext *pb = vobsub->sub_ctx->pb;
866 int ret, psize, total_read = 0, i;
869 int64_t min_ts = INT64_MAX;
871 for (i = 0; i < s->nb_streams; i++) {
872 FFDemuxSubtitlesQueue *tmpq = &vobsub->q[i];
874 av_assert0(tmpq->nb_subs);
875 ts = tmpq->subs[tmpq->current_sub_idx].pts;
882 ret = ff_subtitles_queue_read_packet(q, &idx_pkt);
886 /* compute maximum packet size using the next packet position. This is
887 * useful when the len in the header is non-sense */
888 if (q->current_sub_idx < q->nb_subs) {
889 psize = q->subs[q->current_sub_idx].pos - idx_pkt.pos;
891 int64_t fsize = avio_size(pb);
892 psize = fsize < 0 ? 0xffff : fsize - idx_pkt.pos;
895 avio_seek(pb, idx_pkt.pos, SEEK_SET);
902 int n, to_read, startcode;
904 int64_t old_pos = avio_tell(pb), new_pos;
907 ret = mpegps_read_pes_header(vobsub->sub_ctx, NULL, &startcode, &pts, &dts);
909 if (pkt->size) // raise packet even if incomplete
913 to_read = ret & 0xffff;
914 new_pos = avio_tell(pb);
915 pkt_size = ret + (new_pos - old_pos);
917 /* this prevents reads above the current packet */
918 if (total_read + pkt_size > psize)
920 total_read += pkt_size;
922 /* the current chunk doesn't match the stream index (unlikely) */
923 if ((startcode & 0x1f) != idx_pkt.stream_index)
926 ret = av_grow_packet(pkt, to_read);
930 n = avio_read(pb, pkt->data + (pkt->size - to_read), to_read);
932 pkt->size -= to_read - n;
933 } while (total_read < psize);
935 pkt->pts = pkt->dts = idx_pkt.pts;
936 pkt->pos = idx_pkt.pos;
937 pkt->stream_index = idx_pkt.stream_index;
939 av_free_packet(&idx_pkt);
944 av_free_packet(&idx_pkt);
948 static int vobsub_read_seek(AVFormatContext *s, int stream_index,
949 int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
951 MpegDemuxContext *vobsub = s->priv_data;
953 /* Rescale requested timestamps based on the first stream (timebase is the
954 * same for all subtitles stream within a .idx/.sub). Rescaling is done just
955 * like in avformat_seek_file(). */
956 if (stream_index == -1 && s->nb_streams != 1) {
958 AVRational time_base = s->streams[0]->time_base;
959 ts = av_rescale_q(ts, AV_TIME_BASE_Q, time_base);
960 min_ts = av_rescale_rnd(min_ts, time_base.den,
961 time_base.num * (int64_t)AV_TIME_BASE,
962 AV_ROUND_UP | AV_ROUND_PASS_MINMAX);
963 max_ts = av_rescale_rnd(max_ts, time_base.den,
964 time_base.num * (int64_t)AV_TIME_BASE,
965 AV_ROUND_DOWN | AV_ROUND_PASS_MINMAX);
966 for (i = 0; i < s->nb_streams; i++) {
967 int r = ff_subtitles_queue_seek(&vobsub->q[i], s, stream_index,
968 min_ts, ts, max_ts, flags);
975 if (stream_index == -1) // only 1 stream
977 return ff_subtitles_queue_seek(&vobsub->q[stream_index], s, stream_index,
978 min_ts, ts, max_ts, flags);
981 static int vobsub_read_close(AVFormatContext *s)
984 MpegDemuxContext *vobsub = s->priv_data;
986 for (i = 0; i < s->nb_streams; i++)
987 ff_subtitles_queue_clean(&vobsub->q[i]);
989 avformat_close_input(&vobsub->sub_ctx);
993 AVInputFormat ff_vobsub_demuxer = {
995 .long_name = NULL_IF_CONFIG_SMALL("VobSub subtitle format"),
996 .priv_data_size = sizeof(MpegDemuxContext),
997 .read_probe = vobsub_probe,
998 .read_header = vobsub_read_header,
999 .read_packet = vobsub_read_packet,
1000 .read_seek2 = vobsub_read_seek,
1001 .read_close = vobsub_read_close,
1002 .flags = AVFMT_SHOW_IDS,
1003 .extensions = "idx",