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00022 #include "avformat.h"
00023 #include "internal.h"
00024 #include "mpeg.h"
00025
00026 #if CONFIG_VOBSUB_DEMUXER
00027 # include "subtitles.h"
00028 # include "libavutil/bprint.h"
00029 #endif
00030
00031 #undef NDEBUG
00032 #include <assert.h>
00033
00034
00035
00036
00037 #define MAX_SYNC_SIZE 100000
00038
00039 static int check_pes(uint8_t *p, uint8_t *end){
00040 int pes1;
00041 int pes2= (p[3] & 0xC0) == 0x80
00042 && (p[4] & 0xC0) != 0x40
00043 &&((p[4] & 0xC0) == 0x00 || (p[4]&0xC0)>>2 == (p[6]&0xF0));
00044
00045 for(p+=3; p<end && *p == 0xFF; p++);
00046 if((*p&0xC0) == 0x40) p+=2;
00047 if((*p&0xF0) == 0x20){
00048 pes1= p[0]&p[2]&p[4]&1;
00049 }else if((*p&0xF0) == 0x30){
00050 pes1= p[0]&p[2]&p[4]&p[5]&p[7]&p[9]&1;
00051 }else
00052 pes1 = *p == 0x0F;
00053
00054 return pes1||pes2;
00055 }
00056
00057 static int check_pack_header(const uint8_t *buf) {
00058 return (buf[1] & 0xC0) == 0x40 || (buf[1] & 0xF0) == 0x20;
00059 }
00060
00061 static int mpegps_probe(AVProbeData *p)
00062 {
00063 uint32_t code= -1;
00064 int sys=0, pspack=0, priv1=0, vid=0, audio=0, invalid=0;
00065 int i;
00066 int score=0;
00067
00068 for(i=0; i<p->buf_size; i++){
00069 code = (code<<8) + p->buf[i];
00070 if ((code & 0xffffff00) == 0x100) {
00071 int len= p->buf[i+1] << 8 | p->buf[i+2];
00072 int pes= check_pes(p->buf+i, p->buf+p->buf_size);
00073 int pack = check_pack_header(p->buf+i);
00074
00075 if(code == SYSTEM_HEADER_START_CODE) sys++;
00076 else if(code == PACK_START_CODE && pack) pspack++;
00077 else if((code & 0xf0) == VIDEO_ID && pes) vid++;
00078
00079
00080 else if((code & 0xe0) == AUDIO_ID && pes) {audio++; i+=len;}
00081 else if(code == PRIVATE_STREAM_1 && pes) {priv1++; i+=len;}
00082 else if(code == 0x1fd && pes) vid++;
00083
00084 else if((code & 0xf0) == VIDEO_ID && !pes) invalid++;
00085 else if((code & 0xe0) == AUDIO_ID && !pes) invalid++;
00086 else if(code == PRIVATE_STREAM_1 && !pes) invalid++;
00087 }
00088 }
00089
00090 if(vid+audio > invalid+1)
00091 score= AVPROBE_SCORE_MAX/4;
00092
00093 if(sys>invalid && sys*9 <= pspack*10)
00094 return (audio > 12 || vid > 3 || pspack > 2) ? AVPROBE_SCORE_MAX/2+2 : AVPROBE_SCORE_MAX/4;
00095 if(pspack > invalid && (priv1+vid+audio)*10 >= pspack*9)
00096 return pspack > 2 ? AVPROBE_SCORE_MAX/2+2 : AVPROBE_SCORE_MAX/4;
00097 if((!!vid ^ !!audio) && (audio > 4 || vid > 1) && !sys && !pspack && p->buf_size>2048 && vid + audio > invalid)
00098 return (audio > 12 || vid > 3 + 2*invalid) ? AVPROBE_SCORE_MAX/2+2 : AVPROBE_SCORE_MAX/4;
00099
00100
00101
00102
00103 return score;
00104 }
00105
00106
00107 typedef struct MpegDemuxContext {
00108 int32_t header_state;
00109 unsigned char psm_es_type[256];
00110 int sofdec;
00111 #if CONFIG_VOBSUB_DEMUXER
00112 AVFormatContext *sub_ctx;
00113 FFDemuxSubtitlesQueue q;
00114 #endif
00115 } MpegDemuxContext;
00116
00117 static int mpegps_read_header(AVFormatContext *s)
00118 {
00119 MpegDemuxContext *m = s->priv_data;
00120 const char *sofdec = "Sofdec";
00121 int v, i = 0;
00122 int64_t last_pos = avio_tell(s->pb);
00123
00124 m->header_state = 0xff;
00125 s->ctx_flags |= AVFMTCTX_NOHEADER;
00126
00127 m->sofdec = -1;
00128 do {
00129 v = avio_r8(s->pb);
00130 m->sofdec++;
00131 } while (v == sofdec[i] && i++ < 6);
00132
00133 m->sofdec = (m->sofdec == 6) ? 1 : 0;
00134
00135 if (!m->sofdec)
00136 avio_seek(s->pb, last_pos, SEEK_SET);
00137
00138
00139 return 0;
00140 }
00141
00142 static int64_t get_pts(AVIOContext *pb, int c)
00143 {
00144 uint8_t buf[5];
00145
00146 buf[0] = c<0 ? avio_r8(pb) : c;
00147 avio_read(pb, buf+1, 4);
00148
00149 return ff_parse_pes_pts(buf);
00150 }
00151
00152 static int find_next_start_code(AVIOContext *pb, int *size_ptr,
00153 int32_t *header_state)
00154 {
00155 unsigned int state, v;
00156 int val, n;
00157
00158 state = *header_state;
00159 n = *size_ptr;
00160 while (n > 0) {
00161 if (url_feof(pb))
00162 break;
00163 v = avio_r8(pb);
00164 n--;
00165 if (state == 0x000001) {
00166 state = ((state << 8) | v) & 0xffffff;
00167 val = state;
00168 goto found;
00169 }
00170 state = ((state << 8) | v) & 0xffffff;
00171 }
00172 val = -1;
00173 found:
00174 *header_state = state;
00175 *size_ptr = n;
00176 return val;
00177 }
00178
00185 static long mpegps_psm_parse(MpegDemuxContext *m, AVIOContext *pb)
00186 {
00187 int psm_length, ps_info_length, es_map_length;
00188
00189 psm_length = avio_rb16(pb);
00190 avio_r8(pb);
00191 avio_r8(pb);
00192 ps_info_length = avio_rb16(pb);
00193
00194
00195 avio_skip(pb, ps_info_length);
00196 es_map_length = avio_rb16(pb);
00197
00198
00199 while (es_map_length >= 4){
00200 unsigned char type = avio_r8(pb);
00201 unsigned char es_id = avio_r8(pb);
00202 uint16_t es_info_length = avio_rb16(pb);
00203
00204 m->psm_es_type[es_id] = type;
00205
00206 avio_skip(pb, es_info_length);
00207 es_map_length -= 4 + es_info_length;
00208 }
00209 avio_rb32(pb);
00210 return 2 + psm_length;
00211 }
00212
00213
00214
00215
00216 static int mpegps_read_pes_header(AVFormatContext *s,
00217 int64_t *ppos, int *pstart_code,
00218 int64_t *ppts, int64_t *pdts)
00219 {
00220 MpegDemuxContext *m = s->priv_data;
00221 int len, size, startcode, c, flags, header_len;
00222 int pes_ext, ext2_len, id_ext, skip;
00223 int64_t pts, dts;
00224 int64_t last_sync= avio_tell(s->pb);
00225
00226 error_redo:
00227 avio_seek(s->pb, last_sync, SEEK_SET);
00228 redo:
00229
00230 m->header_state = 0xff;
00231 size = MAX_SYNC_SIZE;
00232 startcode = find_next_start_code(s->pb, &size, &m->header_state);
00233 last_sync = avio_tell(s->pb);
00234 if (startcode < 0){
00235 if(url_feof(s->pb))
00236 return AVERROR_EOF;
00237
00238 return AVERROR(EAGAIN);
00239 }
00240
00241 if (startcode == PACK_START_CODE)
00242 goto redo;
00243 if (startcode == SYSTEM_HEADER_START_CODE)
00244 goto redo;
00245 if (startcode == PADDING_STREAM) {
00246 avio_skip(s->pb, avio_rb16(s->pb));
00247 goto redo;
00248 }
00249 if (startcode == PRIVATE_STREAM_2) {
00250 len = avio_rb16(s->pb);
00251 if (!m->sofdec) {
00252 while (len-- >= 6) {
00253 if (avio_r8(s->pb) == 'S') {
00254 uint8_t buf[5];
00255 avio_read(s->pb, buf, sizeof(buf));
00256 m->sofdec = !memcmp(buf, "ofdec", 5);
00257 len -= sizeof(buf);
00258 break;
00259 }
00260 }
00261 m->sofdec -= !m->sofdec;
00262 }
00263 avio_skip(s->pb, len);
00264 goto redo;
00265 }
00266 if (startcode == PROGRAM_STREAM_MAP) {
00267 mpegps_psm_parse(m, s->pb);
00268 goto redo;
00269 }
00270
00271
00272 if (!((startcode >= 0x1c0 && startcode <= 0x1df) ||
00273 (startcode >= 0x1e0 && startcode <= 0x1ef) ||
00274 (startcode == 0x1bd) || (startcode == 0x1fd)))
00275 goto redo;
00276 if (ppos) {
00277 *ppos = avio_tell(s->pb) - 4;
00278 }
00279 len = avio_rb16(s->pb);
00280 pts =
00281 dts = AV_NOPTS_VALUE;
00282
00283 for(;;) {
00284 if (len < 1)
00285 goto error_redo;
00286 c = avio_r8(s->pb);
00287 len--;
00288
00289 if (c != 0xff)
00290 break;
00291 }
00292 if ((c & 0xc0) == 0x40) {
00293
00294 avio_r8(s->pb);
00295 c = avio_r8(s->pb);
00296 len -= 2;
00297 }
00298 if ((c & 0xe0) == 0x20) {
00299 dts = pts = get_pts(s->pb, c);
00300 len -= 4;
00301 if (c & 0x10){
00302 dts = get_pts(s->pb, -1);
00303 len -= 5;
00304 }
00305 } else if ((c & 0xc0) == 0x80) {
00306
00307 flags = avio_r8(s->pb);
00308 header_len = avio_r8(s->pb);
00309 len -= 2;
00310 if (header_len > len)
00311 goto error_redo;
00312 len -= header_len;
00313 if (flags & 0x80) {
00314 dts = pts = get_pts(s->pb, -1);
00315 header_len -= 5;
00316 if (flags & 0x40) {
00317 dts = get_pts(s->pb, -1);
00318 header_len -= 5;
00319 }
00320 }
00321 if (flags & 0x3f && header_len == 0){
00322 flags &= 0xC0;
00323 av_log(s, AV_LOG_WARNING, "Further flags set but no bytes left\n");
00324 }
00325 if (flags & 0x01) {
00326 pes_ext = avio_r8(s->pb);
00327 header_len--;
00328
00329 skip = (pes_ext >> 4) & 0xb;
00330 skip += skip & 0x9;
00331 if (pes_ext & 0x40 || skip > header_len){
00332 av_log(s, AV_LOG_WARNING, "pes_ext %X is invalid\n", pes_ext);
00333 pes_ext=skip=0;
00334 }
00335 avio_skip(s->pb, skip);
00336 header_len -= skip;
00337
00338 if (pes_ext & 0x01) {
00339 ext2_len = avio_r8(s->pb);
00340 header_len--;
00341 if ((ext2_len & 0x7f) > 0) {
00342 id_ext = avio_r8(s->pb);
00343 if ((id_ext & 0x80) == 0)
00344 startcode = ((startcode & 0xff) << 8) | id_ext;
00345 header_len--;
00346 }
00347 }
00348 }
00349 if(header_len < 0)
00350 goto error_redo;
00351 avio_skip(s->pb, header_len);
00352 }
00353 else if( c!= 0xf )
00354 goto redo;
00355
00356 if (startcode == PRIVATE_STREAM_1) {
00357 startcode = avio_r8(s->pb);
00358 len--;
00359 }
00360 if(len<0)
00361 goto error_redo;
00362 if(dts != AV_NOPTS_VALUE && ppos){
00363 int i;
00364 for(i=0; i<s->nb_streams; i++){
00365 if(startcode == s->streams[i]->id &&
00366 s->pb->seekable ) {
00367 ff_reduce_index(s, i);
00368 av_add_index_entry(s->streams[i], *ppos, dts, 0, 0, AVINDEX_KEYFRAME );
00369 }
00370 }
00371 }
00372
00373 *pstart_code = startcode;
00374 *ppts = pts;
00375 *pdts = dts;
00376 return len;
00377 }
00378
00379 static int mpegps_read_packet(AVFormatContext *s,
00380 AVPacket *pkt)
00381 {
00382 MpegDemuxContext *m = s->priv_data;
00383 AVStream *st;
00384 int len, startcode, i, es_type, ret;
00385 int lpcm_header_len;
00386 int request_probe= 0;
00387 enum AVCodecID codec_id = AV_CODEC_ID_NONE;
00388 enum AVMediaType type;
00389 int64_t pts, dts, dummy_pos;
00390
00391 redo:
00392 len = mpegps_read_pes_header(s, &dummy_pos, &startcode, &pts, &dts);
00393 if (len < 0)
00394 return len;
00395
00396 if (startcode >= 0x80 && startcode <= 0xcf) {
00397 if(len < 4)
00398 goto skip;
00399
00400
00401 avio_r8(s->pb);
00402 lpcm_header_len = avio_rb16(s->pb);
00403 len -= 3;
00404 if (startcode >= 0xb0 && startcode <= 0xbf) {
00405
00406 avio_r8(s->pb);
00407 len--;
00408 }
00409 }
00410
00411
00412 for(i=0;i<s->nb_streams;i++) {
00413 st = s->streams[i];
00414 if (st->id == startcode)
00415 goto found;
00416 }
00417
00418 es_type = m->psm_es_type[startcode & 0xff];
00419 if(es_type > 0 && es_type != STREAM_TYPE_PRIVATE_DATA){
00420 if(es_type == STREAM_TYPE_VIDEO_MPEG1){
00421 codec_id = AV_CODEC_ID_MPEG2VIDEO;
00422 type = AVMEDIA_TYPE_VIDEO;
00423 } else if(es_type == STREAM_TYPE_VIDEO_MPEG2){
00424 codec_id = AV_CODEC_ID_MPEG2VIDEO;
00425 type = AVMEDIA_TYPE_VIDEO;
00426 } else if(es_type == STREAM_TYPE_AUDIO_MPEG1 ||
00427 es_type == STREAM_TYPE_AUDIO_MPEG2){
00428 codec_id = AV_CODEC_ID_MP3;
00429 type = AVMEDIA_TYPE_AUDIO;
00430 } else if(es_type == STREAM_TYPE_AUDIO_AAC){
00431 codec_id = AV_CODEC_ID_AAC;
00432 type = AVMEDIA_TYPE_AUDIO;
00433 } else if(es_type == STREAM_TYPE_VIDEO_MPEG4){
00434 codec_id = AV_CODEC_ID_MPEG4;
00435 type = AVMEDIA_TYPE_VIDEO;
00436 } else if(es_type == STREAM_TYPE_VIDEO_H264){
00437 codec_id = AV_CODEC_ID_H264;
00438 type = AVMEDIA_TYPE_VIDEO;
00439 } else if(es_type == STREAM_TYPE_AUDIO_AC3){
00440 codec_id = AV_CODEC_ID_AC3;
00441 type = AVMEDIA_TYPE_AUDIO;
00442 } else {
00443 goto skip;
00444 }
00445 } else if (startcode >= 0x1e0 && startcode <= 0x1ef) {
00446 static const unsigned char avs_seqh[4] = { 0, 0, 1, 0xb0 };
00447 unsigned char buf[8];
00448 avio_read(s->pb, buf, 8);
00449 avio_seek(s->pb, -8, SEEK_CUR);
00450 if(!memcmp(buf, avs_seqh, 4) && (buf[6] != 0 || buf[7] != 1))
00451 codec_id = AV_CODEC_ID_CAVS;
00452 else
00453 request_probe= 1;
00454 type = AVMEDIA_TYPE_VIDEO;
00455 } else if (startcode >= 0x1c0 && startcode <= 0x1df) {
00456 type = AVMEDIA_TYPE_AUDIO;
00457 codec_id = m->sofdec > 0 ? AV_CODEC_ID_ADPCM_ADX : AV_CODEC_ID_MP2;
00458 } else if (startcode >= 0x80 && startcode <= 0x87) {
00459 type = AVMEDIA_TYPE_AUDIO;
00460 codec_id = AV_CODEC_ID_AC3;
00461 } else if ( ( startcode >= 0x88 && startcode <= 0x8f)
00462 ||( startcode >= 0x98 && startcode <= 0x9f)) {
00463
00464 type = AVMEDIA_TYPE_AUDIO;
00465 codec_id = AV_CODEC_ID_DTS;
00466 } else if (startcode >= 0xa0 && startcode <= 0xaf) {
00467 type = AVMEDIA_TYPE_AUDIO;
00468 if(lpcm_header_len == 6) {
00469 codec_id = AV_CODEC_ID_MLP;
00470 } else {
00471
00472 codec_id = AV_CODEC_ID_PCM_DVD;
00473 }
00474 } else if (startcode >= 0xb0 && startcode <= 0xbf) {
00475 type = AVMEDIA_TYPE_AUDIO;
00476 codec_id = AV_CODEC_ID_TRUEHD;
00477 } else if (startcode >= 0xc0 && startcode <= 0xcf) {
00478
00479 type = AVMEDIA_TYPE_AUDIO;
00480 codec_id = AV_CODEC_ID_AC3;
00481 } else if (startcode >= 0x20 && startcode <= 0x3f) {
00482 type = AVMEDIA_TYPE_SUBTITLE;
00483 codec_id = AV_CODEC_ID_DVD_SUBTITLE;
00484 } else if (startcode >= 0xfd55 && startcode <= 0xfd5f) {
00485 type = AVMEDIA_TYPE_VIDEO;
00486 codec_id = AV_CODEC_ID_VC1;
00487 } else {
00488 skip:
00489
00490 avio_skip(s->pb, len);
00491 goto redo;
00492 }
00493
00494 st = avformat_new_stream(s, NULL);
00495 if (!st)
00496 goto skip;
00497 st->id = startcode;
00498 st->codec->codec_type = type;
00499 st->codec->codec_id = codec_id;
00500 st->request_probe = request_probe;
00501 if (codec_id != AV_CODEC_ID_PCM_S16BE)
00502 st->need_parsing = AVSTREAM_PARSE_FULL;
00503 found:
00504 if(st->discard >= AVDISCARD_ALL)
00505 goto skip;
00506 if (startcode >= 0xa0 && startcode <= 0xaf) {
00507 if (lpcm_header_len == 6) {
00508 if (len < 6)
00509 goto skip;
00510 avio_skip(s->pb, 6);
00511 len -=6;
00512 } else {
00513 int b1, freq;
00514
00515
00516
00517 if (len <= 3)
00518 goto skip;
00519 avio_r8(s->pb);
00520 b1 = avio_r8(s->pb);
00521 avio_r8(s->pb);
00522 len -= 3;
00523 freq = (b1 >> 4) & 3;
00524 st->codec->sample_rate = lpcm_freq_tab[freq];
00525 st->codec->channels = 1 + (b1 & 7);
00526 st->codec->bits_per_coded_sample = 16 + ((b1 >> 6) & 3) * 4;
00527 st->codec->bit_rate = st->codec->channels *
00528 st->codec->sample_rate *
00529 st->codec->bits_per_coded_sample;
00530 if (st->codec->bits_per_coded_sample == 16)
00531 st->codec->codec_id = AV_CODEC_ID_PCM_S16BE;
00532 else if (st->codec->bits_per_coded_sample == 28)
00533 return AVERROR(EINVAL);
00534 }
00535 }
00536 ret = av_get_packet(s->pb, pkt, len);
00537 pkt->pts = pts;
00538 pkt->dts = dts;
00539 pkt->pos = dummy_pos;
00540 pkt->stream_index = st->index;
00541 av_dlog(s, "%d: pts=%0.3f dts=%0.3f size=%d\n",
00542 pkt->stream_index, pkt->pts / 90000.0, pkt->dts / 90000.0,
00543 pkt->size);
00544
00545 return (ret < 0) ? ret : 0;
00546 }
00547
00548 static int64_t mpegps_read_dts(AVFormatContext *s, int stream_index,
00549 int64_t *ppos, int64_t pos_limit)
00550 {
00551 int len, startcode;
00552 int64_t pos, pts, dts;
00553
00554 pos = *ppos;
00555 if (avio_seek(s->pb, pos, SEEK_SET) < 0)
00556 return AV_NOPTS_VALUE;
00557
00558 for(;;) {
00559 len = mpegps_read_pes_header(s, &pos, &startcode, &pts, &dts);
00560 if (len < 0) {
00561 av_dlog(s, "none (ret=%d)\n", len);
00562 return AV_NOPTS_VALUE;
00563 }
00564 if (startcode == s->streams[stream_index]->id &&
00565 dts != AV_NOPTS_VALUE) {
00566 break;
00567 }
00568 avio_skip(s->pb, len);
00569 }
00570 av_dlog(s, "pos=0x%"PRIx64" dts=0x%"PRIx64" %0.3f\n",
00571 pos, dts, dts / 90000.0);
00572 *ppos = pos;
00573 return dts;
00574 }
00575
00576 AVInputFormat ff_mpegps_demuxer = {
00577 .name = "mpeg",
00578 .long_name = NULL_IF_CONFIG_SMALL("MPEG-PS (MPEG-2 Program Stream)"),
00579 .priv_data_size = sizeof(MpegDemuxContext),
00580 .read_probe = mpegps_probe,
00581 .read_header = mpegps_read_header,
00582 .read_packet = mpegps_read_packet,
00583 .read_timestamp = mpegps_read_dts,
00584 .flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT,
00585 };
00586
00587 #if CONFIG_VOBSUB_DEMUXER
00588
00589 #define REF_STRING "# VobSub index file,"
00590
00591 static int vobsub_probe(AVProbeData *p)
00592 {
00593 if (!strncmp(p->buf, REF_STRING, sizeof(REF_STRING) - 1))
00594 return AVPROBE_SCORE_MAX;
00595 return 0;
00596 }
00597
00598 static int vobsub_read_header(AVFormatContext *s)
00599 {
00600 int i, header_size, ret = 0, header_parsed = 0, langidx = 0;
00601 MpegDemuxContext *vobsub = s->priv_data;
00602 char *sub_name = NULL;
00603 size_t fname_len;
00604 char *ext, *header_str;
00605 AVBPrint header;
00606 int64_t delay = 0;
00607 AVStream *st = NULL;
00608
00609 sub_name = av_strdup(s->filename);
00610 fname_len = strlen(sub_name);
00611 ext = sub_name - 3 + fname_len;
00612 if (fname_len < 4 || *(ext - 1) != '.') {
00613 av_log(s, AV_LOG_ERROR, "The input index filename is too short "
00614 "to guess the associated .SUB file\n");
00615 ret = AVERROR_INVALIDDATA;
00616 goto end;
00617 }
00618 memcpy(ext, !strncmp(ext, "IDX", 3) ? "SUB" : "sub", 3);
00619 av_log(s, AV_LOG_VERBOSE, "IDX/SUB: %s -> %s\n", s->filename, sub_name);
00620 ret = avformat_open_input(&vobsub->sub_ctx, sub_name, &ff_mpegps_demuxer, NULL);
00621 if (ret < 0) {
00622 av_log(s, AV_LOG_ERROR, "Unable to open %s as MPEG subtitles\n", sub_name);
00623 goto end;
00624 }
00625
00626 av_bprint_init(&header, 0, AV_BPRINT_SIZE_UNLIMITED);
00627 while (!url_feof(s->pb)) {
00628 char line[2048];
00629 int len = ff_get_line(s->pb, line, sizeof(line));
00630
00631 if (!len)
00632 break;
00633
00634 line[strcspn(line, "\r\n")] = 0;
00635
00636 if (!strncmp(line, "id:", 3)) {
00637 int n, stream_id = 0;
00638 char id[64] = {0};
00639
00640 n = sscanf(line, "id: %63[^,], index: %u", id, &stream_id);
00641 if (n != 2) {
00642 av_log(s, AV_LOG_WARNING, "Unable to parse index line '%s', "
00643 "assuming 'id: und, index: 0'\n", line);
00644 strcpy(id, "und");
00645 stream_id = 0;
00646 }
00647
00648 st = avformat_new_stream(s, NULL);
00649 if (!st) {
00650 ret = AVERROR(ENOMEM);
00651 goto end;
00652 }
00653 st->id = stream_id;
00654 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
00655 st->codec->codec_id = AV_CODEC_ID_DVD_SUBTITLE;
00656 av_dict_set(&st->metadata, "language", id, 0);
00657 av_log(s, AV_LOG_DEBUG, "IDX stream[%d] id=%s\n", stream_id, id);
00658 header_parsed = 1;
00659
00660 } else if (st && !strncmp(line, "timestamp:", 10)) {
00661 AVPacket *sub;
00662 int hh, mm, ss, ms;
00663 int64_t pos, timestamp;
00664 const char *p = line + 10;
00665
00666 if (sscanf(p, "%02d:%02d:%02d:%03d, filepos: %"PRIx64,
00667 &hh, &mm, &ss, &ms, &pos) != 5) {
00668 av_log(s, AV_LOG_ERROR, "Unable to parse timestamp line '%s', "
00669 "abort parsing\n", line);
00670 break;
00671 }
00672 timestamp = (hh*3600LL + mm*60LL + ss) * 1000LL + ms + delay;
00673 timestamp = av_rescale_q(timestamp, (AVRational){1,1000}, st->time_base);
00674
00675 sub = ff_subtitles_queue_insert(&vobsub->q, "", 0, 0);
00676 if (!sub) {
00677 ret = AVERROR(ENOMEM);
00678 goto end;
00679 }
00680 sub->pos = pos;
00681 sub->pts = timestamp;
00682 sub->stream_index = s->nb_streams - 1;
00683
00684 } else if (st && !strncmp(line, "alt:", 4)) {
00685 const char *p = line + 4;
00686
00687 while (*p == ' ')
00688 p++;
00689 av_dict_set(&st->metadata, "title", p, 0);
00690 av_log(s, AV_LOG_DEBUG, "IDX stream[%d] name=%s\n", st->id, p);
00691 header_parsed = 1;
00692
00693 } else if (!strncmp(line, "delay:", 6)) {
00694 int sign = 1, hh = 0, mm = 0, ss = 0, ms = 0;
00695 const char *p = line + 6;
00696
00697 while (*p == ' ')
00698 p++;
00699 if (*p == '-' || *p == '+') {
00700 sign = *p == '-' ? -1 : 1;
00701 p++;
00702 }
00703 sscanf(p, "%d:%d:%d:%d", &hh, &mm, &ss, &ms);
00704 delay = ((hh*3600LL + mm*60LL + ss) * 1000LL + ms) * sign;
00705
00706 } else if (!strncmp(line, "langidx:", 8)) {
00707 const char *p = line + 8;
00708
00709 if (sscanf(p, "%d", &langidx) != 1)
00710 av_log(s, AV_LOG_ERROR, "Invalid langidx specified\n");
00711
00712 } else if (!header_parsed) {
00713 if (line[0] && line[0] != '#')
00714 av_bprintf(&header, "%s\n", line);
00715 }
00716 }
00717
00718 if (langidx < s->nb_streams)
00719 s->streams[langidx]->disposition |= AV_DISPOSITION_DEFAULT;
00720
00721 ff_subtitles_queue_finalize(&vobsub->q);
00722
00723 if (!av_bprint_is_complete(&header)) {
00724 av_bprint_finalize(&header, NULL);
00725 ret = AVERROR(ENOMEM);
00726 goto end;
00727 }
00728 av_bprint_finalize(&header, &header_str);
00729 header_size = header.len + 1;
00730 for (i = 0; i < s->nb_streams; i++) {
00731 AVStream *sub_st = s->streams[i];
00732 sub_st->codec->extradata = av_strdup(header_str);
00733 sub_st->codec->extradata_size = header_size;
00734 }
00735 av_free(header_str);
00736
00737 end:
00738 av_free(sub_name);
00739 return ret;
00740 }
00741
00742 static int vobsub_read_packet(AVFormatContext *s, AVPacket *pkt)
00743 {
00744 MpegDemuxContext *vobsub = s->priv_data;
00745 FFDemuxSubtitlesQueue *q = &vobsub->q;
00746 AVIOContext *pb = vobsub->sub_ctx->pb;
00747 int ret, psize, len16 = -1;
00748 AVPacket idx_pkt;
00749
00750 ret = ff_subtitles_queue_read_packet(q, &idx_pkt);
00751 if (ret < 0)
00752 return ret;
00753
00754
00755
00756 if (q->current_sub_idx < q->nb_subs) {
00757 psize = q->subs[q->current_sub_idx].pos - idx_pkt.pos;
00758 } else {
00759 int64_t fsize = avio_size(pb);
00760 psize = fsize < 0 ? 0xffff : fsize - idx_pkt.pos;
00761 }
00762
00763 avio_seek(pb, idx_pkt.pos, SEEK_SET);
00764
00765 av_init_packet(pkt);
00766 pkt->size = 0;
00767 pkt->data = NULL;
00768
00769 do {
00770 int n, to_read, startcode;
00771 int64_t pts, dts;
00772
00773 ret = mpegps_read_pes_header(vobsub->sub_ctx, NULL, &startcode, &pts, &dts);
00774 if (ret < 0)
00775 return ret;
00776 to_read = ret & 0xffff;
00777
00778
00779 if (pkt->size + to_read > psize)
00780 break;
00781
00782
00783 if (len16 != -1 && pkt->size + to_read > len16)
00784 break;
00785
00786
00787 if ((startcode & 0x1f) != idx_pkt.stream_index)
00788 break;
00789
00790 ret = av_grow_packet(pkt, to_read);
00791 if (ret < 0)
00792 return ret;
00793
00794 n = avio_read(pb, pkt->data + (pkt->size - to_read), to_read);
00795 if (n < to_read)
00796 pkt->size -= to_read - n;
00797
00798
00799 if (len16 == -1 && n > 2)
00800 len16 = AV_RB16(pkt->data);
00801 } while (len16 != -1 && pkt->size != len16);
00802
00803 pkt->pts = pkt->dts = idx_pkt.pts;
00804 pkt->pos = idx_pkt.pos;
00805 pkt->stream_index = idx_pkt.stream_index;
00806
00807 return 0;
00808 }
00809
00810 static int vobsub_read_seek(AVFormatContext *s, int stream_index,
00811 int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
00812 {
00813 MpegDemuxContext *vobsub = s->priv_data;
00814 return ff_subtitles_queue_seek(&vobsub->q, s, stream_index,
00815 min_ts, ts, max_ts, flags);
00816 }
00817
00818 static int vobsub_read_close(AVFormatContext *s)
00819 {
00820 MpegDemuxContext *vobsub = s->priv_data;
00821 ff_subtitles_queue_clean(&vobsub->q);
00822 if (vobsub->sub_ctx)
00823 avformat_close_input(&vobsub->sub_ctx);
00824 return 0;
00825 }
00826
00827 AVInputFormat ff_vobsub_demuxer = {
00828 .name = "vobsub",
00829 .long_name = NULL_IF_CONFIG_SMALL("VobSub subtitle format"),
00830 .priv_data_size = sizeof(MpegDemuxContext),
00831 .read_probe = vobsub_probe,
00832 .read_header = vobsub_read_header,
00833 .read_packet = vobsub_read_packet,
00834 .read_seek2 = vobsub_read_seek,
00835 .read_close = vobsub_read_close,
00836 .flags = AVFMT_SHOW_IDS,
00837 .extensions = "idx",
00838 };
00839 #endif