yading@11: /*
yading@11:  * MPEG1/2 demuxer
yading@11:  * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
yading@11:  *
yading@11:  * This file is part of FFmpeg.
yading@11:  *
yading@11:  * FFmpeg is free software; you can redistribute it and/or
yading@11:  * modify it under the terms of the GNU Lesser General Public
yading@11:  * License as published by the Free Software Foundation; either
yading@11:  * version 2.1 of the License, or (at your option) any later version.
yading@11:  *
yading@11:  * FFmpeg is distributed in the hope that it will be useful,
yading@11:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@11:  * Lesser General Public License for more details.
yading@11:  *
yading@11:  * You should have received a copy of the GNU Lesser General Public
yading@11:  * License along with FFmpeg; if not, write to the Free Software
yading@11:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@11:  */
yading@11: 
yading@11: #include "avformat.h"
yading@11: #include "internal.h"
yading@11: #include "mpeg.h"
yading@11: 
yading@11: #if CONFIG_VOBSUB_DEMUXER
yading@11: # include "subtitles.h"
yading@11: # include "libavutil/bprint.h"
yading@11: #endif
yading@11: 
yading@11: #undef NDEBUG
yading@11: #include <assert.h>
yading@11: #include "libavutil/avassert.h"
yading@11: 
yading@11: /*********************************************/
yading@11: /* demux code */
yading@11: 
yading@11: #define MAX_SYNC_SIZE 100000
yading@11: 
yading@11: static int check_pes(const uint8_t *p, const uint8_t *end){
yading@11:     int pes1;
yading@11:     int pes2=      (p[3] & 0xC0) == 0x80
yading@11:                 && (p[4] & 0xC0) != 0x40
yading@11:                 &&((p[4] & 0xC0) == 0x00 || (p[4]&0xC0)>>2 == (p[6]&0xF0));
yading@11: 
yading@11:     for(p+=3; p<end && *p == 0xFF; p++);
yading@11:     if((*p&0xC0) == 0x40) p+=2;
yading@11:     if((*p&0xF0) == 0x20){
yading@11:         pes1= p[0]&p[2]&p[4]&1;
yading@11:     }else if((*p&0xF0) == 0x30){
yading@11:         pes1= p[0]&p[2]&p[4]&p[5]&p[7]&p[9]&1;
yading@11:     }else
yading@11:         pes1 = *p == 0x0F;
yading@11: 
yading@11:     return pes1||pes2;
yading@11: }
yading@11: 
yading@11: static int check_pack_header(const uint8_t *buf) {
yading@11:     return (buf[1] & 0xC0) == 0x40 || (buf[1] & 0xF0) == 0x20;
yading@11: }
yading@11: 
yading@11: static int mpegps_probe(AVProbeData *p)
yading@11: {
yading@11:     uint32_t code= -1;
yading@11:     int sys=0, pspack=0, priv1=0, vid=0, audio=0, invalid=0;
yading@11:     int i;
yading@11:     int score=0;
yading@11: 
yading@11:     for(i=0; i<p->buf_size; i++){
yading@11:         code = (code<<8) + p->buf[i];
yading@11:         if ((code & 0xffffff00) == 0x100) {
yading@11:             int len= p->buf[i+1] << 8 | p->buf[i+2];
yading@11:             int pes= check_pes(p->buf+i, p->buf+p->buf_size);
yading@11:             int pack = check_pack_header(p->buf+i);
yading@11: 
yading@11:             if(code == SYSTEM_HEADER_START_CODE) sys++;
yading@11:             else if(code == PACK_START_CODE && pack) pspack++;
yading@11:             else if((code & 0xf0) == VIDEO_ID &&  pes) vid++;
yading@11:             // skip pes payload to avoid start code emulation for private
yading@11:             // and audio streams
yading@11:             else if((code & 0xe0) == AUDIO_ID &&  pes) {audio++; i+=len;}
yading@11:             else if(code == PRIVATE_STREAM_1  &&  pes) {priv1++; i+=len;}
yading@11:             else if(code == 0x1fd             &&  pes) vid++; //VC1
yading@11: 
yading@11:             else if((code & 0xf0) == VIDEO_ID && !pes) invalid++;
yading@11:             else if((code & 0xe0) == AUDIO_ID && !pes) invalid++;
yading@11:             else if(code == PRIVATE_STREAM_1  && !pes) invalid++;
yading@11:         }
yading@11:     }
yading@11: 
yading@11:     if(vid+audio > invalid+1)     /* invalid VDR files nd short PES streams */
yading@11:         score= AVPROBE_SCORE_MAX/4;
yading@11: 
yading@11:     if(sys>invalid && sys*9 <= pspack*10)
yading@11:         return (audio > 12 || vid > 3 || pspack > 2) ? AVPROBE_SCORE_MAX/2+2 : AVPROBE_SCORE_MAX/4; // +1 for .mpg
yading@11:     if(pspack > invalid && (priv1+vid+audio)*10 >= pspack*9)
yading@11:         return pspack > 2 ? AVPROBE_SCORE_MAX/2+2 : AVPROBE_SCORE_MAX/4; // +1 for .mpg
yading@11:     if((!!vid ^ !!audio) && (audio > 4 || vid > 1) && !sys && !pspack && p->buf_size>2048 && vid + audio > invalid) /* PES stream */
yading@11:         return (audio > 12 || vid > 3 + 2*invalid) ? AVPROBE_SCORE_MAX/2+2 : AVPROBE_SCORE_MAX/4;
yading@11: 
yading@11:     //02-Penguin.flac has sys:0 priv1:0 pspack:0 vid:0 audio:1
yading@11:     //mp3_misidentified_2.mp3 has sys:0 priv1:0 pspack:0 vid:0 audio:6
yading@11:     //Have\ Yourself\ a\ Merry\ Little\ Christmas.mp3 0 0 0 5 0 1 len:21618
yading@11:     return score;
yading@11: }
yading@11: 
yading@11: 
yading@11: typedef struct MpegDemuxContext {
yading@11:     int32_t header_state;
yading@11:     unsigned char psm_es_type[256];
yading@11:     int sofdec;
yading@11:     int dvd;
yading@11:     int imkh_cctv;
yading@11: #if CONFIG_VOBSUB_DEMUXER
yading@11:     AVFormatContext *sub_ctx;
yading@11:     FFDemuxSubtitlesQueue q;
yading@11: #endif
yading@11: } MpegDemuxContext;
yading@11: 
yading@11: static int mpegps_read_header(AVFormatContext *s)
yading@11: {
yading@11:     MpegDemuxContext *m = s->priv_data;
yading@11:     char buffer[7];
yading@11:     int64_t last_pos = avio_tell(s->pb);
yading@11: 
yading@11:     m->header_state = 0xff;
yading@11:     s->ctx_flags |= AVFMTCTX_NOHEADER;
yading@11: 
yading@11:     avio_get_str(s->pb, 6, buffer, sizeof(buffer));
yading@11:     if (!memcmp("IMKH", buffer, 4)) {
yading@11:         m->imkh_cctv = 1;
yading@11:     } else if (!memcmp("Sofdec", buffer, 6)) {
yading@11:         m->sofdec = 1;
yading@11:     } else
yading@11:        avio_seek(s->pb, last_pos, SEEK_SET);
yading@11: 
yading@11:     /* no need to do more */
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int64_t get_pts(AVIOContext *pb, int c)
yading@11: {
yading@11:     uint8_t buf[5];
yading@11: 
yading@11:     buf[0] = c<0 ? avio_r8(pb) : c;
yading@11:     avio_read(pb, buf+1, 4);
yading@11: 
yading@11:     return ff_parse_pes_pts(buf);
yading@11: }
yading@11: 
yading@11: static int find_next_start_code(AVIOContext *pb, int *size_ptr,
yading@11:                                 int32_t *header_state)
yading@11: {
yading@11:     unsigned int state, v;
yading@11:     int val, n;
yading@11: 
yading@11:     state = *header_state;
yading@11:     n = *size_ptr;
yading@11:     while (n > 0) {
yading@11:         if (url_feof(pb))
yading@11:             break;
yading@11:         v = avio_r8(pb);
yading@11:         n--;
yading@11:         if (state == 0x000001) {
yading@11:             state = ((state << 8) | v) & 0xffffff;
yading@11:             val = state;
yading@11:             goto found;
yading@11:         }
yading@11:         state = ((state << 8) | v) & 0xffffff;
yading@11:     }
yading@11:     val = -1;
yading@11:  found:
yading@11:     *header_state = state;
yading@11:     *size_ptr = n;
yading@11:     return val;
yading@11: }
yading@11: 
yading@11: /**
yading@11:  * Extract stream types from a program stream map
yading@11:  * According to ISO/IEC 13818-1 ('MPEG-2 Systems') table 2-35
yading@11:  *
yading@11:  * @return number of bytes occupied by PSM in the bitstream
yading@11:  */
yading@11: static long mpegps_psm_parse(MpegDemuxContext *m, AVIOContext *pb)
yading@11: {
yading@11:     int psm_length, ps_info_length, es_map_length;
yading@11: 
yading@11:     psm_length = avio_rb16(pb);
yading@11:     avio_r8(pb);
yading@11:     avio_r8(pb);
yading@11:     ps_info_length = avio_rb16(pb);
yading@11: 
yading@11:     /* skip program_stream_info */
yading@11:     avio_skip(pb, ps_info_length);
yading@11:     es_map_length = avio_rb16(pb);
yading@11: 
yading@11:     /* at least one es available? */
yading@11:     while (es_map_length >= 4){
yading@11:         unsigned char type      = avio_r8(pb);
yading@11:         unsigned char es_id     = avio_r8(pb);
yading@11:         uint16_t es_info_length = avio_rb16(pb);
yading@11:         /* remember mapping from stream id to stream type */
yading@11:         m->psm_es_type[es_id] = type;
yading@11:         /* skip program_stream_info */
yading@11:         avio_skip(pb, es_info_length);
yading@11:         es_map_length -= 4 + es_info_length;
yading@11:     }
yading@11:     avio_rb32(pb); /* crc32 */
yading@11:     return 2 + psm_length;
yading@11: }
yading@11: 
yading@11: /* read the next PES header. Return its position in ppos
yading@11:    (if not NULL), and its start code, pts and dts.
yading@11:  */
yading@11: static int mpegps_read_pes_header(AVFormatContext *s,
yading@11:                                   int64_t *ppos, int *pstart_code,
yading@11:                                   int64_t *ppts, int64_t *pdts)
yading@11: {
yading@11:     MpegDemuxContext *m = s->priv_data;
yading@11:     int len, size, startcode, c, flags, header_len;
yading@11:     int pes_ext, ext2_len, id_ext, skip;
yading@11:     int64_t pts, dts;
yading@11:     int64_t last_sync= avio_tell(s->pb);
yading@11: 
yading@11:  error_redo:
yading@11:         avio_seek(s->pb, last_sync, SEEK_SET);
yading@11:  redo:
yading@11:         /* next start code (should be immediately after) */
yading@11:         m->header_state = 0xff;
yading@11:         size = MAX_SYNC_SIZE;
yading@11:         startcode = find_next_start_code(s->pb, &size, &m->header_state);
yading@11:         last_sync = avio_tell(s->pb);
yading@11:     if (startcode < 0){
yading@11:         if(url_feof(s->pb))
yading@11:             return AVERROR_EOF;
yading@11:         //FIXME we should remember header_state
yading@11:         return AVERROR(EAGAIN);
yading@11:     }
yading@11: 
yading@11:     if (startcode == PACK_START_CODE)
yading@11:         goto redo;
yading@11:     if (startcode == SYSTEM_HEADER_START_CODE)
yading@11:         goto redo;
yading@11:     if (startcode == PADDING_STREAM) {
yading@11:         avio_skip(s->pb, avio_rb16(s->pb));
yading@11:         goto redo;
yading@11:     }
yading@11:     if (startcode == PRIVATE_STREAM_2) {
yading@11:         if (!m->sofdec) {
yading@11:             /* Need to detect whether this from a DVD or a 'Sofdec' stream */
yading@11:             int len = avio_rb16(s->pb);
yading@11:             int bytesread = 0;
yading@11:             uint8_t *ps2buf = av_malloc(len);
yading@11: 
yading@11:             if (ps2buf) {
yading@11:                 bytesread = avio_read(s->pb, ps2buf, len);
yading@11: 
yading@11:                 if (bytesread != len) {
yading@11:                     avio_skip(s->pb, len - bytesread);
yading@11:                 } else {
yading@11:                     uint8_t *p = 0;
yading@11:                     if (len >= 6)
yading@11:                         p = memchr(ps2buf, 'S', len - 5);
yading@11: 
yading@11:                     if (p)
yading@11:                         m->sofdec = !memcmp(p+1, "ofdec", 5);
yading@11: 
yading@11:                     m->sofdec -= !m->sofdec;
yading@11: 
yading@11:                     if (m->sofdec < 0) {
yading@11:                         if (len == 980  && ps2buf[0] == 0) {
yading@11:                             /* PCI structure? */
yading@11:                             uint32_t startpts = AV_RB32(ps2buf + 0x0d);
yading@11:                             uint32_t endpts = AV_RB32(ps2buf + 0x11);
yading@11:                             uint8_t hours = ((ps2buf[0x19] >> 4) * 10) + (ps2buf[0x19] & 0x0f);
yading@11:                             uint8_t mins  = ((ps2buf[0x1a] >> 4) * 10) + (ps2buf[0x1a] & 0x0f);
yading@11:                             uint8_t secs  = ((ps2buf[0x1b] >> 4) * 10) + (ps2buf[0x1b] & 0x0f);
yading@11: 
yading@11:                             m->dvd = (hours <= 23 &&
yading@11:                                       mins  <= 59 &&
yading@11:                                       secs  <= 59 &&
yading@11:                                       (ps2buf[0x19] & 0x0f) < 10 &&
yading@11:                                       (ps2buf[0x1a] & 0x0f) < 10 &&
yading@11:                                       (ps2buf[0x1b] & 0x0f) < 10 &&
yading@11:                                       endpts >= startpts);
yading@11:                         } else if (len == 1018 && ps2buf[0] == 1) {
yading@11:                             /* DSI structure? */
yading@11:                             uint8_t hours = ((ps2buf[0x1d] >> 4) * 10) + (ps2buf[0x1d] & 0x0f);
yading@11:                             uint8_t mins  = ((ps2buf[0x1e] >> 4) * 10) + (ps2buf[0x1e] & 0x0f);
yading@11:                             uint8_t secs  = ((ps2buf[0x1f] >> 4) * 10) + (ps2buf[0x1f] & 0x0f);
yading@11: 
yading@11:                             m->dvd = (hours <= 23 &&
yading@11:                                       mins  <= 59 &&
yading@11:                                       secs  <= 59 &&
yading@11:                                       (ps2buf[0x1d] & 0x0f) < 10 &&
yading@11:                                       (ps2buf[0x1e] & 0x0f) < 10 &&
yading@11:                                       (ps2buf[0x1f] & 0x0f) < 10);
yading@11:                         }
yading@11:                     }
yading@11:                 }
yading@11: 
yading@11:                 av_free(ps2buf);
yading@11: 
yading@11:                 /* If this isn't a DVD packet or no memory
yading@11:                  * could be allocated, just ignore it.
yading@11:                  * If we did, move back to the start of the
yading@11:                  * packet (plus 'length' field) */
yading@11:                 if (!m->dvd || avio_skip(s->pb, -(len + 2)) < 0) {
yading@11:                     /* Skip back failed.
yading@11:                      * This packet will be lost but that can't be helped
yading@11:                      * if we can't skip back
yading@11:                      */
yading@11:                     goto redo;
yading@11:                 }
yading@11:             } else {
yading@11:                 /* No memory */
yading@11:                 avio_skip(s->pb, len);
yading@11:                 goto redo;
yading@11:             }
yading@11:         } else if (!m->dvd) {
yading@11:             int len = avio_rb16(s->pb);
yading@11:             avio_skip(s->pb, len);
yading@11:             goto redo;
yading@11:         }
yading@11:     }
yading@11:     if (startcode == PROGRAM_STREAM_MAP) {
yading@11:         mpegps_psm_parse(m, s->pb);
yading@11:         goto redo;
yading@11:     }
yading@11: 
yading@11:     /* find matching stream */
yading@11:     if (!((startcode >= 0x1c0 && startcode <= 0x1df) ||
yading@11:           (startcode >= 0x1e0 && startcode <= 0x1ef) ||
yading@11:           (startcode == 0x1bd) ||
yading@11:           (startcode == PRIVATE_STREAM_2) ||
yading@11:           (startcode == 0x1fd)))
yading@11:         goto redo;
yading@11:     if (ppos) {
yading@11:         *ppos = avio_tell(s->pb) - 4;
yading@11:     }
yading@11:     len = avio_rb16(s->pb);
yading@11:     pts =
yading@11:     dts = AV_NOPTS_VALUE;
yading@11:     if (startcode != PRIVATE_STREAM_2)
yading@11:     {
yading@11:     /* stuffing */
yading@11:     for(;;) {
yading@11:         if (len < 1)
yading@11:             goto error_redo;
yading@11:         c = avio_r8(s->pb);
yading@11:         len--;
yading@11:         /* XXX: for mpeg1, should test only bit 7 */
yading@11:         if (c != 0xff)
yading@11:             break;
yading@11:     }
yading@11:     if ((c & 0xc0) == 0x40) {
yading@11:         /* buffer scale & size */
yading@11:         avio_r8(s->pb);
yading@11:         c = avio_r8(s->pb);
yading@11:         len -= 2;
yading@11:     }
yading@11:     if ((c & 0xe0) == 0x20) {
yading@11:         dts = pts = get_pts(s->pb, c);
yading@11:         len -= 4;
yading@11:         if (c & 0x10){
yading@11:             dts = get_pts(s->pb, -1);
yading@11:             len -= 5;
yading@11:         }
yading@11:     } else if ((c & 0xc0) == 0x80) {
yading@11:         /* mpeg 2 PES */
yading@11:         flags = avio_r8(s->pb);
yading@11:         header_len = avio_r8(s->pb);
yading@11:         len -= 2;
yading@11:         if (header_len > len)
yading@11:             goto error_redo;
yading@11:         len -= header_len;
yading@11:         if (flags & 0x80) {
yading@11:             dts = pts = get_pts(s->pb, -1);
yading@11:             header_len -= 5;
yading@11:             if (flags & 0x40) {
yading@11:                 dts = get_pts(s->pb, -1);
yading@11:                 header_len -= 5;
yading@11:             }
yading@11:         }
yading@11:         if (flags & 0x3f && header_len == 0){
yading@11:             flags &= 0xC0;
yading@11:             av_log(s, AV_LOG_WARNING, "Further flags set but no bytes left\n");
yading@11:         }
yading@11:         if (flags & 0x01) { /* PES extension */
yading@11:             pes_ext = avio_r8(s->pb);
yading@11:             header_len--;
yading@11:             /* Skip PES private data, program packet sequence counter and P-STD buffer */
yading@11:             skip = (pes_ext >> 4) & 0xb;
yading@11:             skip += skip & 0x9;
yading@11:             if (pes_ext & 0x40 || skip > header_len){
yading@11:                 av_log(s, AV_LOG_WARNING, "pes_ext %X is invalid\n", pes_ext);
yading@11:                 pes_ext=skip=0;
yading@11:             }
yading@11:             avio_skip(s->pb, skip);
yading@11:             header_len -= skip;
yading@11: 
yading@11:             if (pes_ext & 0x01) { /* PES extension 2 */
yading@11:                 ext2_len = avio_r8(s->pb);
yading@11:                 header_len--;
yading@11:                 if ((ext2_len & 0x7f) > 0) {
yading@11:                     id_ext = avio_r8(s->pb);
yading@11:                     if ((id_ext & 0x80) == 0)
yading@11:                         startcode = ((startcode & 0xff) << 8) | id_ext;
yading@11:                     header_len--;
yading@11:                 }
yading@11:             }
yading@11:         }
yading@11:         if(header_len < 0)
yading@11:             goto error_redo;
yading@11:         avio_skip(s->pb, header_len);
yading@11:     }
yading@11:     else if( c!= 0xf )
yading@11:         goto redo;
yading@11:     }
yading@11: 
yading@11:     if (startcode == PRIVATE_STREAM_1) {
yading@11:         startcode = avio_r8(s->pb);
yading@11:         len--;
yading@11:     }
yading@11:     if(len<0)
yading@11:         goto error_redo;
yading@11:     if(dts != AV_NOPTS_VALUE && ppos){
yading@11:         int i;
yading@11:         for(i=0; i<s->nb_streams; i++){
yading@11:             if(startcode == s->streams[i]->id &&
yading@11:                s->pb->seekable /* index useless on streams anyway */) {
yading@11:                 ff_reduce_index(s, i);
yading@11:                 av_add_index_entry(s->streams[i], *ppos, dts, 0, 0, AVINDEX_KEYFRAME /* FIXME keyframe? */);
yading@11:             }
yading@11:         }
yading@11:     }
yading@11: 
yading@11:     *pstart_code = startcode;
yading@11:     *ppts = pts;
yading@11:     *pdts = dts;
yading@11:     return len;
yading@11: }
yading@11: 
yading@11: static int mpegps_read_packet(AVFormatContext *s,
yading@11:                               AVPacket *pkt)
yading@11: {
yading@11:     MpegDemuxContext *m = s->priv_data;
yading@11:     AVStream *st;
yading@11:     int len, startcode, i, es_type, ret;
yading@11:     int lpcm_header_len = -1; //Init to supress warning
yading@11:     int request_probe= 0;
yading@11:     enum AVCodecID codec_id = AV_CODEC_ID_NONE;
yading@11:     enum AVMediaType type;
yading@11:     int64_t pts, dts, dummy_pos; //dummy_pos is needed for the index building to work
yading@11: 
yading@11:  redo:
yading@11:     len = mpegps_read_pes_header(s, &dummy_pos, &startcode, &pts, &dts);
yading@11:     if (len < 0)
yading@11:         return len;
yading@11: 
yading@11:     if (startcode >= 0x80 && startcode <= 0xcf) {
yading@11:         if(len < 4)
yading@11:             goto skip;
yading@11: 
yading@11:         /* audio: skip header */
yading@11:         avio_r8(s->pb);
yading@11:         lpcm_header_len = avio_rb16(s->pb);
yading@11:         len -= 3;
yading@11:         if (startcode >= 0xb0 && startcode <= 0xbf) {
yading@11:             /* MLP/TrueHD audio has a 4-byte header */
yading@11:             avio_r8(s->pb);
yading@11:             len--;
yading@11:         }
yading@11:     }
yading@11: 
yading@11:     /* now find stream */
yading@11:     for(i=0;i<s->nb_streams;i++) {
yading@11:         st = s->streams[i];
yading@11:         if (st->id == startcode)
yading@11:             goto found;
yading@11:     }
yading@11: 
yading@11:     es_type = m->psm_es_type[startcode & 0xff];
yading@11:         if(es_type == STREAM_TYPE_VIDEO_MPEG1){
yading@11:             codec_id = AV_CODEC_ID_MPEG2VIDEO;
yading@11:             type = AVMEDIA_TYPE_VIDEO;
yading@11:         } else if(es_type == STREAM_TYPE_VIDEO_MPEG2){
yading@11:             codec_id = AV_CODEC_ID_MPEG2VIDEO;
yading@11:             type = AVMEDIA_TYPE_VIDEO;
yading@11:         } else if(es_type == STREAM_TYPE_AUDIO_MPEG1 ||
yading@11:                   es_type == STREAM_TYPE_AUDIO_MPEG2){
yading@11:             codec_id = AV_CODEC_ID_MP3;
yading@11:             type = AVMEDIA_TYPE_AUDIO;
yading@11:         } else if(es_type == STREAM_TYPE_AUDIO_AAC){
yading@11:             codec_id = AV_CODEC_ID_AAC;
yading@11:             type = AVMEDIA_TYPE_AUDIO;
yading@11:         } else if(es_type == STREAM_TYPE_VIDEO_MPEG4){
yading@11:             codec_id = AV_CODEC_ID_MPEG4;
yading@11:             type = AVMEDIA_TYPE_VIDEO;
yading@11:         } else if(es_type == STREAM_TYPE_VIDEO_H264){
yading@11:             codec_id = AV_CODEC_ID_H264;
yading@11:             type = AVMEDIA_TYPE_VIDEO;
yading@11:         } else if(es_type == STREAM_TYPE_AUDIO_AC3){
yading@11:             codec_id = AV_CODEC_ID_AC3;
yading@11:             type = AVMEDIA_TYPE_AUDIO;
yading@11:         } else if(m->imkh_cctv && es_type == 0x91){
yading@11:             codec_id = AV_CODEC_ID_PCM_MULAW;
yading@11:             type = AVMEDIA_TYPE_AUDIO;
yading@11:     } else if (startcode >= 0x1e0 && startcode <= 0x1ef) {
yading@11:         static const unsigned char avs_seqh[4] = { 0, 0, 1, 0xb0 };
yading@11:         unsigned char buf[8];
yading@11:         avio_read(s->pb, buf, 8);
yading@11:         avio_seek(s->pb, -8, SEEK_CUR);
yading@11:         if(!memcmp(buf, avs_seqh, 4) && (buf[6] != 0 || buf[7] != 1))
yading@11:             codec_id = AV_CODEC_ID_CAVS;
yading@11:         else
yading@11:             request_probe= 1;
yading@11:         type = AVMEDIA_TYPE_VIDEO;
yading@11:     } else if (startcode == PRIVATE_STREAM_2) {
yading@11:         type = AVMEDIA_TYPE_DATA;
yading@11:         codec_id = AV_CODEC_ID_DVD_NAV;
yading@11:     } else if (startcode >= 0x1c0 && startcode <= 0x1df) {
yading@11:         type = AVMEDIA_TYPE_AUDIO;
yading@11:         codec_id = m->sofdec > 0 ? AV_CODEC_ID_ADPCM_ADX : AV_CODEC_ID_MP2;
yading@11:     } else if (startcode >= 0x80 && startcode <= 0x87) {
yading@11:         type = AVMEDIA_TYPE_AUDIO;
yading@11:         codec_id = AV_CODEC_ID_AC3;
yading@11:     } else if (  ( startcode >= 0x88 && startcode <= 0x8f)
yading@11:                ||( startcode >= 0x98 && startcode <= 0x9f)) {
yading@11:         /* 0x90 - 0x97 is reserved for SDDS in DVD specs */
yading@11:         type = AVMEDIA_TYPE_AUDIO;
yading@11:         codec_id = AV_CODEC_ID_DTS;
yading@11:     } else if (startcode >= 0xa0 && startcode <= 0xaf) {
yading@11:         type = AVMEDIA_TYPE_AUDIO;
yading@11:         if(lpcm_header_len == 6) {
yading@11:             codec_id = AV_CODEC_ID_MLP;
yading@11:         } else {
yading@11:             /* 16 bit form will be handled as AV_CODEC_ID_PCM_S16BE */
yading@11:             codec_id = AV_CODEC_ID_PCM_DVD;
yading@11:         }
yading@11:     } else if (startcode >= 0xb0 && startcode <= 0xbf) {
yading@11:         type = AVMEDIA_TYPE_AUDIO;
yading@11:         codec_id = AV_CODEC_ID_TRUEHD;
yading@11:     } else if (startcode >= 0xc0 && startcode <= 0xcf) {
yading@11:         /* Used for both AC-3 and E-AC-3 in EVOB files */
yading@11:         type = AVMEDIA_TYPE_AUDIO;
yading@11:         codec_id = AV_CODEC_ID_AC3;
yading@11:     } else if (startcode >= 0x20 && startcode <= 0x3f) {
yading@11:         type = AVMEDIA_TYPE_SUBTITLE;
yading@11:         codec_id = AV_CODEC_ID_DVD_SUBTITLE;
yading@11:     } else if (startcode >= 0xfd55 && startcode <= 0xfd5f) {
yading@11:         type = AVMEDIA_TYPE_VIDEO;
yading@11:         codec_id = AV_CODEC_ID_VC1;
yading@11:     } else {
yading@11:     skip:
yading@11:         /* skip packet */
yading@11:         avio_skip(s->pb, len);
yading@11:         goto redo;
yading@11:     }
yading@11:     /* no stream found: add a new stream */
yading@11:     st = avformat_new_stream(s, NULL);
yading@11:     if (!st)
yading@11:         goto skip;
yading@11:     st->id = startcode;
yading@11:     st->codec->codec_type = type;
yading@11:     st->codec->codec_id = codec_id;
yading@11:     if (st->codec->codec_id == AV_CODEC_ID_PCM_MULAW) {
yading@11:         st->codec->channels = 1;
yading@11:         st->codec->channel_layout = AV_CH_LAYOUT_MONO;
yading@11:         st->codec->sample_rate = 8000;
yading@11:     }
yading@11:     st->request_probe     = request_probe;
yading@11:     if (codec_id != AV_CODEC_ID_PCM_S16BE)
yading@11:         st->need_parsing = AVSTREAM_PARSE_FULL;
yading@11:  found:
yading@11:     if(st->discard >= AVDISCARD_ALL)
yading@11:         goto skip;
yading@11:     if (startcode >= 0xa0 && startcode <= 0xaf) {
yading@11:       if (lpcm_header_len == 6 && st->codec->codec_id == AV_CODEC_ID_MLP) {
yading@11:             if (len < 6)
yading@11:                 goto skip;
yading@11:             avio_skip(s->pb, 6);
yading@11:             len -=6;
yading@11:       } else {
yading@11:         int b1, freq;
yading@11: 
yading@11:         /* for LPCM, we just skip the header and consider it is raw
yading@11:            audio data */
yading@11:         if (len <= 3)
yading@11:             goto skip;
yading@11:         avio_r8(s->pb); /* emphasis (1), muse(1), reserved(1), frame number(5) */
yading@11:         b1 = avio_r8(s->pb); /* quant (2), freq(2), reserved(1), channels(3) */
yading@11:         avio_r8(s->pb); /* dynamic range control (0x80 = off) */
yading@11:         len -= 3;
yading@11:         freq = (b1 >> 4) & 3;
yading@11:         st->codec->sample_rate = lpcm_freq_tab[freq];
yading@11:         st->codec->channels = 1 + (b1 & 7);
yading@11:         st->codec->bits_per_coded_sample = 16 + ((b1 >> 6) & 3) * 4;
yading@11:         st->codec->bit_rate = st->codec->channels *
yading@11:                               st->codec->sample_rate *
yading@11:                               st->codec->bits_per_coded_sample;
yading@11:         if (st->codec->bits_per_coded_sample == 16)
yading@11:             st->codec->codec_id = AV_CODEC_ID_PCM_S16BE;
yading@11:         else if (st->codec->bits_per_coded_sample == 28)
yading@11:             return AVERROR(EINVAL);
yading@11:       }
yading@11:     }
yading@11:     ret = av_get_packet(s->pb, pkt, len);
yading@11:     pkt->pts = pts;
yading@11:     pkt->dts = dts;
yading@11:     pkt->pos = dummy_pos;
yading@11:     pkt->stream_index = st->index;
yading@11:     av_dlog(s, "%d: pts=%0.3f dts=%0.3f size=%d\n",
yading@11:             pkt->stream_index, pkt->pts / 90000.0, pkt->dts / 90000.0,
yading@11:             pkt->size);
yading@11: 
yading@11:     return (ret < 0) ? ret : 0;
yading@11: }
yading@11: 
yading@11: static int64_t mpegps_read_dts(AVFormatContext *s, int stream_index,
yading@11:                                int64_t *ppos, int64_t pos_limit)
yading@11: {
yading@11:     int len, startcode;
yading@11:     int64_t pos, pts, dts;
yading@11: 
yading@11:     pos = *ppos;
yading@11:     if (avio_seek(s->pb, pos, SEEK_SET) < 0)
yading@11:         return AV_NOPTS_VALUE;
yading@11: 
yading@11:     for(;;) {
yading@11:         len = mpegps_read_pes_header(s, &pos, &startcode, &pts, &dts);
yading@11:         if (len < 0) {
yading@11:             av_dlog(s, "none (ret=%d)\n", len);
yading@11:             return AV_NOPTS_VALUE;
yading@11:         }
yading@11:         if (startcode == s->streams[stream_index]->id &&
yading@11:             dts != AV_NOPTS_VALUE) {
yading@11:             break;
yading@11:         }
yading@11:         avio_skip(s->pb, len);
yading@11:     }
yading@11:     av_dlog(s, "pos=0x%"PRIx64" dts=0x%"PRIx64" %0.3f\n",
yading@11:             pos, dts, dts / 90000.0);
yading@11:     *ppos = pos;
yading@11:     return dts;
yading@11: }
yading@11: 
yading@11: AVInputFormat ff_mpegps_demuxer = {
yading@11:     .name           = "mpeg",
yading@11:     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-PS (MPEG-2 Program Stream)"),
yading@11:     .priv_data_size = sizeof(MpegDemuxContext),
yading@11:     .read_probe     = mpegps_probe,
yading@11:     .read_header    = mpegps_read_header,
yading@11:     .read_packet    = mpegps_read_packet,
yading@11:     .read_timestamp = mpegps_read_dts,
yading@11:     .flags          = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT,
yading@11: };
yading@11: 
yading@11: #if CONFIG_VOBSUB_DEMUXER
yading@11: 
yading@11: #define REF_STRING "# VobSub index file,"
yading@11: 
yading@11: static int vobsub_probe(AVProbeData *p)
yading@11: {
yading@11:     if (!strncmp(p->buf, REF_STRING, sizeof(REF_STRING) - 1))
yading@11:         return AVPROBE_SCORE_MAX;
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int vobsub_read_header(AVFormatContext *s)
yading@11: {
yading@11:     int i, ret = 0, header_parsed = 0, langidx = 0;
yading@11:     MpegDemuxContext *vobsub = s->priv_data;
yading@11:     char *sub_name = NULL;
yading@11:     size_t fname_len;
yading@11:     char *ext, *header_str;
yading@11:     AVBPrint header;
yading@11:     int64_t delay = 0;
yading@11:     AVStream *st = NULL;
yading@11: 
yading@11:     sub_name = av_strdup(s->filename);
yading@11:     fname_len = strlen(sub_name);
yading@11:     ext = sub_name - 3 + fname_len;
yading@11:     if (fname_len < 4 || *(ext - 1) != '.') {
yading@11:         av_log(s, AV_LOG_ERROR, "The input index filename is too short "
yading@11:                "to guess the associated .SUB file\n");
yading@11:         ret = AVERROR_INVALIDDATA;
yading@11:         goto end;
yading@11:     }
yading@11:     memcpy(ext, !strncmp(ext, "IDX", 3) ? "SUB" : "sub", 3);
yading@11:     av_log(s, AV_LOG_VERBOSE, "IDX/SUB: %s -> %s\n", s->filename, sub_name);
yading@11:     ret = avformat_open_input(&vobsub->sub_ctx, sub_name, &ff_mpegps_demuxer, NULL);
yading@11:     if (ret < 0) {
yading@11:         av_log(s, AV_LOG_ERROR, "Unable to open %s as MPEG subtitles\n", sub_name);
yading@11:         goto end;
yading@11:     }
yading@11: 
yading@11:     av_bprint_init(&header, 0, AV_BPRINT_SIZE_UNLIMITED);
yading@11:     while (!url_feof(s->pb)) {
yading@11:         char line[2048];
yading@11:         int len = ff_get_line(s->pb, line, sizeof(line));
yading@11: 
yading@11:         if (!len)
yading@11:             break;
yading@11: 
yading@11:         line[strcspn(line, "\r\n")] = 0;
yading@11: 
yading@11:         if (!strncmp(line, "id:", 3)) {
yading@11:             int n, stream_id = 0;
yading@11:             char id[64] = {0};
yading@11: 
yading@11:             n = sscanf(line, "id: %63[^,], index: %u", id, &stream_id);
yading@11:             if (n != 2) {
yading@11:                 av_log(s, AV_LOG_WARNING, "Unable to parse index line '%s', "
yading@11:                        "assuming 'id: und, index: 0'\n", line);
yading@11:                 strcpy(id, "und");
yading@11:                 stream_id = 0;
yading@11:             }
yading@11: 
yading@11:             st = avformat_new_stream(s, NULL);
yading@11:             if (!st) {
yading@11:                 ret = AVERROR(ENOMEM);
yading@11:                 goto end;
yading@11:             }
yading@11:             st->id = stream_id;
yading@11:             st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
yading@11:             st->codec->codec_id   = AV_CODEC_ID_DVD_SUBTITLE;
yading@11:             av_dict_set(&st->metadata, "language", id, 0);
yading@11:             av_log(s, AV_LOG_DEBUG, "IDX stream[%d] id=%s\n", stream_id, id);
yading@11:             header_parsed = 1;
yading@11: 
yading@11:         } else if (st && !strncmp(line, "timestamp:", 10)) {
yading@11:             AVPacket *sub;
yading@11:             int hh, mm, ss, ms;
yading@11:             int64_t pos, timestamp;
yading@11:             const char *p = line + 10;
yading@11: 
yading@11:             if (sscanf(p, "%02d:%02d:%02d:%03d, filepos: %"SCNx64,
yading@11:                        &hh, &mm, &ss, &ms, &pos) != 5) {
yading@11:                 av_log(s, AV_LOG_ERROR, "Unable to parse timestamp line '%s', "
yading@11:                        "abort parsing\n", line);
yading@11:                 break;
yading@11:             }
yading@11:             timestamp = (hh*3600LL + mm*60LL + ss) * 1000LL + ms + delay;
yading@11:             timestamp = av_rescale_q(timestamp, (AVRational){1,1000}, st->time_base);
yading@11: 
yading@11:             sub = ff_subtitles_queue_insert(&vobsub->q, "", 0, 0);
yading@11:             if (!sub) {
yading@11:                 ret = AVERROR(ENOMEM);
yading@11:                 goto end;
yading@11:             }
yading@11:             sub->pos = pos;
yading@11:             sub->pts = timestamp;
yading@11:             sub->stream_index = s->nb_streams - 1;
yading@11: 
yading@11:         } else if (st && !strncmp(line, "alt:", 4)) {
yading@11:             const char *p = line + 4;
yading@11: 
yading@11:             while (*p == ' ')
yading@11:                 p++;
yading@11:             av_dict_set(&st->metadata, "title", p, 0);
yading@11:             av_log(s, AV_LOG_DEBUG, "IDX stream[%d] name=%s\n", st->id, p);
yading@11:             header_parsed = 1;
yading@11: 
yading@11:         } else if (!strncmp(line, "delay:", 6)) {
yading@11:             int sign = 1, hh = 0, mm = 0, ss = 0, ms = 0;
yading@11:             const char *p = line + 6;
yading@11: 
yading@11:             while (*p == ' ')
yading@11:                 p++;
yading@11:             if (*p == '-' || *p == '+') {
yading@11:                 sign = *p == '-' ? -1 : 1;
yading@11:                 p++;
yading@11:             }
yading@11:             sscanf(p, "%d:%d:%d:%d", &hh, &mm, &ss, &ms);
yading@11:             delay = ((hh*3600LL + mm*60LL + ss) * 1000LL + ms) * sign;
yading@11: 
yading@11:         } else if (!strncmp(line, "langidx:", 8)) {
yading@11:             const char *p = line + 8;
yading@11: 
yading@11:             if (sscanf(p, "%d", &langidx) != 1)
yading@11:                 av_log(s, AV_LOG_ERROR, "Invalid langidx specified\n");
yading@11: 
yading@11:         } else if (!header_parsed) {
yading@11:             if (line[0] && line[0] != '#')
yading@11:                 av_bprintf(&header, "%s\n", line);
yading@11:         }
yading@11:     }
yading@11: 
yading@11:     if (langidx < s->nb_streams)
yading@11:         s->streams[langidx]->disposition |= AV_DISPOSITION_DEFAULT;
yading@11: 
yading@11:     ff_subtitles_queue_finalize(&vobsub->q);
yading@11: 
yading@11:     if (!av_bprint_is_complete(&header)) {
yading@11:         av_bprint_finalize(&header, NULL);
yading@11:         ret = AVERROR(ENOMEM);
yading@11:         goto end;
yading@11:     }
yading@11:     av_bprint_finalize(&header, &header_str);
yading@11:     for (i = 0; i < s->nb_streams; i++) {
yading@11:         AVStream *sub_st = s->streams[i];
yading@11:         sub_st->codec->extradata      = av_strdup(header_str);
yading@11:         sub_st->codec->extradata_size = header.len;
yading@11:     }
yading@11:     av_free(header_str);
yading@11: 
yading@11: end:
yading@11:     av_free(sub_name);
yading@11:     return ret;
yading@11: }
yading@11: 
yading@11: #define FAIL(r) do { ret = r; goto fail; } while (0)
yading@11: 
yading@11: static int vobsub_read_packet(AVFormatContext *s, AVPacket *pkt)
yading@11: {
yading@11:     MpegDemuxContext *vobsub = s->priv_data;
yading@11:     FFDemuxSubtitlesQueue *q = &vobsub->q;
yading@11:     AVIOContext *pb = vobsub->sub_ctx->pb;
yading@11:     int ret, psize, len16 = -1;
yading@11:     AVPacket idx_pkt;
yading@11: 
yading@11:     ret = ff_subtitles_queue_read_packet(q, &idx_pkt);
yading@11:     if (ret < 0)
yading@11:         return ret;
yading@11: 
yading@11:     /* compute maximum packet size using the next packet position. This is
yading@11:      * useful when the len in the header is non-sense */
yading@11:     if (q->current_sub_idx < q->nb_subs) {
yading@11:         psize = q->subs[q->current_sub_idx].pos - idx_pkt.pos;
yading@11:     } else {
yading@11:         int64_t fsize = avio_size(pb);
yading@11:         psize = fsize < 0 ? 0xffff : fsize - idx_pkt.pos;
yading@11:     }
yading@11: 
yading@11:     avio_seek(pb, idx_pkt.pos, SEEK_SET);
yading@11: 
yading@11:     av_init_packet(pkt);
yading@11:     pkt->size = 0;
yading@11:     pkt->data = NULL;
yading@11: 
yading@11:     do {
yading@11:         int n, to_read, startcode;
yading@11:         int64_t pts, dts;
yading@11: 
yading@11:         ret = mpegps_read_pes_header(vobsub->sub_ctx, NULL, &startcode, &pts, &dts);
yading@11:         if (ret < 0)
yading@11:             FAIL(ret);
yading@11:         to_read = ret & 0xffff;
yading@11: 
yading@11:         /* this prevents reads above the current packet */
yading@11:         if (pkt->size + to_read > psize)
yading@11:             break;
yading@11: 
yading@11:         /* if the len is computed, we check for overread */
yading@11:         if (len16 != -1 && pkt->size + to_read > len16)
yading@11:             break;
yading@11: 
yading@11:         /* the current chunk doesn't match the stream index (unlikely) */
yading@11:         if ((startcode & 0x1f) != idx_pkt.stream_index)
yading@11:             break;
yading@11: 
yading@11:         ret = av_grow_packet(pkt, to_read);
yading@11:         if (ret < 0)
yading@11:             FAIL(ret);
yading@11: 
yading@11:         n = avio_read(pb, pkt->data + (pkt->size - to_read), to_read);
yading@11:         if (n < to_read)
yading@11:             pkt->size -= to_read - n;
yading@11: 
yading@11:         /* first chunk contains the total len of the packet to raise */
yading@11:         if (len16 == -1 && n > 2)
yading@11:             len16 = AV_RB16(pkt->data);
yading@11:     } while (len16 != -1 && pkt->size != len16);
yading@11: 
yading@11:     pkt->pts = pkt->dts = idx_pkt.pts;
yading@11:     pkt->pos = idx_pkt.pos;
yading@11:     pkt->stream_index = idx_pkt.stream_index;
yading@11: 
yading@11:     av_free_packet(&idx_pkt);
yading@11:     return 0;
yading@11: 
yading@11: fail:
yading@11:     av_free_packet(&idx_pkt);
yading@11:     return ret;
yading@11: }
yading@11: 
yading@11: static int vobsub_read_seek(AVFormatContext *s, int stream_index,
yading@11:                             int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
yading@11: {
yading@11:     MpegDemuxContext *vobsub = s->priv_data;
yading@11:     return ff_subtitles_queue_seek(&vobsub->q, s, stream_index,
yading@11:                                    min_ts, ts, max_ts, flags);
yading@11: }
yading@11: 
yading@11: static int vobsub_read_close(AVFormatContext *s)
yading@11: {
yading@11:     MpegDemuxContext *vobsub = s->priv_data;
yading@11:     ff_subtitles_queue_clean(&vobsub->q);
yading@11:     if (vobsub->sub_ctx)
yading@11:         avformat_close_input(&vobsub->sub_ctx);
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: AVInputFormat ff_vobsub_demuxer = {
yading@11:     .name           = "vobsub",
yading@11:     .long_name      = NULL_IF_CONFIG_SMALL("VobSub subtitle format"),
yading@11:     .priv_data_size = sizeof(MpegDemuxContext),
yading@11:     .read_probe     = vobsub_probe,
yading@11:     .read_header    = vobsub_read_header,
yading@11:     .read_packet    = vobsub_read_packet,
yading@11:     .read_seek2     = vobsub_read_seek,
yading@11:     .read_close     = vobsub_read_close,
yading@11:     .flags          = AVFMT_SHOW_IDS,
yading@11:     .extensions     = "idx",
yading@11: };
yading@11: #endif