958 lines
31 KiB
C
958 lines
31 KiB
C
/*
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* MPEG1/2 demuxer
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* Copyright (c) 2000, 2001, 2002 Fabrice Bellard
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "avformat.h"
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#include "internal.h"
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#include "mpeg.h"
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#if CONFIG_VOBSUB_DEMUXER
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# include "subtitles.h"
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# include "libavutil/bprint.h"
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#endif
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#undef NDEBUG
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#include <assert.h>
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#include "libavutil/avassert.h"
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/*********************************************/
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/* demux code */
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#define MAX_SYNC_SIZE 100000
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static int check_pes(const uint8_t *p, const uint8_t *end){
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int pes1;
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int pes2= (p[3] & 0xC0) == 0x80
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&& (p[4] & 0xC0) != 0x40
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&&((p[4] & 0xC0) == 0x00 || (p[4]&0xC0)>>2 == (p[6]&0xF0));
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for(p+=3; p<end && *p == 0xFF; p++);
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if((*p&0xC0) == 0x40) p+=2;
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if((*p&0xF0) == 0x20){
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pes1= p[0]&p[2]&p[4]&1;
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}else if((*p&0xF0) == 0x30){
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pes1= p[0]&p[2]&p[4]&p[5]&p[7]&p[9]&1;
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}else
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pes1 = *p == 0x0F;
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return pes1||pes2;
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}
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static int check_pack_header(const uint8_t *buf) {
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return (buf[1] & 0xC0) == 0x40 || (buf[1] & 0xF0) == 0x20;
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}
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static int mpegps_probe(AVProbeData *p)
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{
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uint32_t code= -1;
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int sys=0, pspack=0, priv1=0, vid=0, audio=0, invalid=0;
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int i;
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int score=0;
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for(i=0; i<p->buf_size; i++){
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code = (code<<8) + p->buf[i];
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if ((code & 0xffffff00) == 0x100) {
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int len= p->buf[i+1] << 8 | p->buf[i+2];
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int pes= check_pes(p->buf+i, p->buf+p->buf_size);
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int pack = check_pack_header(p->buf+i);
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if(code == SYSTEM_HEADER_START_CODE) sys++;
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else if(code == PACK_START_CODE && pack) pspack++;
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else if((code & 0xf0) == VIDEO_ID && pes) vid++;
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// skip pes payload to avoid start code emulation for private
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// and audio streams
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else if((code & 0xe0) == AUDIO_ID && pes) {audio++; i+=len;}
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else if(code == PRIVATE_STREAM_1 && pes) {priv1++; i+=len;}
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else if(code == 0x1fd && pes) vid++; //VC1
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else if((code & 0xf0) == VIDEO_ID && !pes) invalid++;
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else if((code & 0xe0) == AUDIO_ID && !pes) invalid++;
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else if(code == PRIVATE_STREAM_1 && !pes) invalid++;
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}
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}
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if(vid+audio > invalid+1) /* invalid VDR files nd short PES streams */
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score = AVPROBE_SCORE_EXTENSION / 2;
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if(sys>invalid && sys*9 <= pspack*10)
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return (audio > 12 || vid > 3 || pspack > 2) ? AVPROBE_SCORE_EXTENSION + 2 : AVPROBE_SCORE_EXTENSION / 2; // 1 more than .mpg
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if(pspack > invalid && (priv1+vid+audio)*10 >= pspack*9)
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return pspack > 2 ? AVPROBE_SCORE_EXTENSION + 2 : AVPROBE_SCORE_EXTENSION / 2; // 1 more than .mpg
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if((!!vid ^ !!audio) && (audio > 4 || vid > 1) && !sys && !pspack && p->buf_size>2048 && vid + audio > invalid) /* PES stream */
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return (audio > 12 || vid > 3 + 2*invalid) ? AVPROBE_SCORE_EXTENSION + 2 : AVPROBE_SCORE_EXTENSION / 2;
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//02-Penguin.flac has sys:0 priv1:0 pspack:0 vid:0 audio:1
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//mp3_misidentified_2.mp3 has sys:0 priv1:0 pspack:0 vid:0 audio:6
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//Have\ Yourself\ a\ Merry\ Little\ Christmas.mp3 0 0 0 5 0 1 len:21618
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return score;
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}
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typedef struct MpegDemuxContext {
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int32_t header_state;
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unsigned char psm_es_type[256];
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int sofdec;
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int dvd;
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int imkh_cctv;
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#if CONFIG_VOBSUB_DEMUXER
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AVFormatContext *sub_ctx;
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FFDemuxSubtitlesQueue q[32];
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#endif
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} MpegDemuxContext;
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static int mpegps_read_header(AVFormatContext *s)
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{
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MpegDemuxContext *m = s->priv_data;
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char buffer[7];
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int64_t last_pos = avio_tell(s->pb);
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m->header_state = 0xff;
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s->ctx_flags |= AVFMTCTX_NOHEADER;
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avio_get_str(s->pb, 6, buffer, sizeof(buffer));
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if (!memcmp("IMKH", buffer, 4)) {
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m->imkh_cctv = 1;
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} else if (!memcmp("Sofdec", buffer, 6)) {
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m->sofdec = 1;
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} else
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avio_seek(s->pb, last_pos, SEEK_SET);
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/* no need to do more */
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return 0;
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}
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static int64_t get_pts(AVIOContext *pb, int c)
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{
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uint8_t buf[5];
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buf[0] = c<0 ? avio_r8(pb) : c;
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avio_read(pb, buf+1, 4);
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return ff_parse_pes_pts(buf);
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}
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static int find_next_start_code(AVIOContext *pb, int *size_ptr,
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int32_t *header_state)
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{
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unsigned int state, v;
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int val, n;
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state = *header_state;
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n = *size_ptr;
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while (n > 0) {
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if (url_feof(pb))
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break;
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v = avio_r8(pb);
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n--;
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if (state == 0x000001) {
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state = ((state << 8) | v) & 0xffffff;
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val = state;
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goto found;
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}
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state = ((state << 8) | v) & 0xffffff;
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}
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val = -1;
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found:
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*header_state = state;
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*size_ptr = n;
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return val;
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}
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/**
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* Extract stream types from a program stream map
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* According to ISO/IEC 13818-1 ('MPEG-2 Systems') table 2-35
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*
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* @return number of bytes occupied by PSM in the bitstream
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*/
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static long mpegps_psm_parse(MpegDemuxContext *m, AVIOContext *pb)
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{
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int psm_length, ps_info_length, es_map_length;
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psm_length = avio_rb16(pb);
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avio_r8(pb);
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avio_r8(pb);
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ps_info_length = avio_rb16(pb);
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/* skip program_stream_info */
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avio_skip(pb, ps_info_length);
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es_map_length = avio_rb16(pb);
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/* Ignore es_map_length, trust psm_length */
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es_map_length = psm_length - ps_info_length - 10;
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/* at least one es available? */
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while (es_map_length >= 4){
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unsigned char type = avio_r8(pb);
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unsigned char es_id = avio_r8(pb);
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uint16_t es_info_length = avio_rb16(pb);
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/* remember mapping from stream id to stream type */
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m->psm_es_type[es_id] = type;
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/* skip program_stream_info */
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avio_skip(pb, es_info_length);
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es_map_length -= 4 + es_info_length;
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}
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avio_rb32(pb); /* crc32 */
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return 2 + psm_length;
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}
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/* read the next PES header. Return its position in ppos
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(if not NULL), and its start code, pts and dts.
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*/
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static int mpegps_read_pes_header(AVFormatContext *s,
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int64_t *ppos, int *pstart_code,
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int64_t *ppts, int64_t *pdts)
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{
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MpegDemuxContext *m = s->priv_data;
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int len, size, startcode, c, flags, header_len;
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int pes_ext, ext2_len, id_ext, skip;
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int64_t pts, dts;
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int64_t last_sync= avio_tell(s->pb);
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error_redo:
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avio_seek(s->pb, last_sync, SEEK_SET);
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redo:
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/* next start code (should be immediately after) */
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m->header_state = 0xff;
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size = MAX_SYNC_SIZE;
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startcode = find_next_start_code(s->pb, &size, &m->header_state);
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last_sync = avio_tell(s->pb);
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if (startcode < 0){
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if(url_feof(s->pb))
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return AVERROR_EOF;
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//FIXME we should remember header_state
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return AVERROR(EAGAIN);
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}
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if (startcode == PACK_START_CODE)
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goto redo;
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if (startcode == SYSTEM_HEADER_START_CODE)
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goto redo;
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if (startcode == PADDING_STREAM) {
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avio_skip(s->pb, avio_rb16(s->pb));
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goto redo;
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}
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if (startcode == PRIVATE_STREAM_2) {
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if (!m->sofdec) {
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/* Need to detect whether this from a DVD or a 'Sofdec' stream */
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int len = avio_rb16(s->pb);
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int bytesread = 0;
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uint8_t *ps2buf = av_malloc(len);
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if (ps2buf) {
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bytesread = avio_read(s->pb, ps2buf, len);
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if (bytesread != len) {
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avio_skip(s->pb, len - bytesread);
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} else {
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uint8_t *p = 0;
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if (len >= 6)
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p = memchr(ps2buf, 'S', len - 5);
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if (p)
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m->sofdec = !memcmp(p+1, "ofdec", 5);
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m->sofdec -= !m->sofdec;
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if (m->sofdec < 0) {
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if (len == 980 && ps2buf[0] == 0) {
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/* PCI structure? */
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uint32_t startpts = AV_RB32(ps2buf + 0x0d);
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uint32_t endpts = AV_RB32(ps2buf + 0x11);
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uint8_t hours = ((ps2buf[0x19] >> 4) * 10) + (ps2buf[0x19] & 0x0f);
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uint8_t mins = ((ps2buf[0x1a] >> 4) * 10) + (ps2buf[0x1a] & 0x0f);
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uint8_t secs = ((ps2buf[0x1b] >> 4) * 10) + (ps2buf[0x1b] & 0x0f);
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m->dvd = (hours <= 23 &&
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mins <= 59 &&
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secs <= 59 &&
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(ps2buf[0x19] & 0x0f) < 10 &&
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(ps2buf[0x1a] & 0x0f) < 10 &&
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(ps2buf[0x1b] & 0x0f) < 10 &&
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endpts >= startpts);
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} else if (len == 1018 && ps2buf[0] == 1) {
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/* DSI structure? */
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uint8_t hours = ((ps2buf[0x1d] >> 4) * 10) + (ps2buf[0x1d] & 0x0f);
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uint8_t mins = ((ps2buf[0x1e] >> 4) * 10) + (ps2buf[0x1e] & 0x0f);
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uint8_t secs = ((ps2buf[0x1f] >> 4) * 10) + (ps2buf[0x1f] & 0x0f);
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m->dvd = (hours <= 23 &&
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mins <= 59 &&
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secs <= 59 &&
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(ps2buf[0x1d] & 0x0f) < 10 &&
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(ps2buf[0x1e] & 0x0f) < 10 &&
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(ps2buf[0x1f] & 0x0f) < 10);
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}
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}
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}
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av_free(ps2buf);
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/* If this isn't a DVD packet or no memory
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* could be allocated, just ignore it.
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* If we did, move back to the start of the
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* packet (plus 'length' field) */
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if (!m->dvd || avio_skip(s->pb, -(len + 2)) < 0) {
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/* Skip back failed.
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* This packet will be lost but that can't be helped
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* if we can't skip back
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*/
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goto redo;
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}
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} else {
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/* No memory */
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avio_skip(s->pb, len);
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goto redo;
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}
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} else if (!m->dvd) {
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int len = avio_rb16(s->pb);
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avio_skip(s->pb, len);
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goto redo;
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}
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}
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if (startcode == PROGRAM_STREAM_MAP) {
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mpegps_psm_parse(m, s->pb);
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goto redo;
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}
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/* find matching stream */
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if (!((startcode >= 0x1c0 && startcode <= 0x1df) ||
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(startcode >= 0x1e0 && startcode <= 0x1ef) ||
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(startcode == 0x1bd) ||
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(startcode == PRIVATE_STREAM_2) ||
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(startcode == 0x1fd)))
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goto redo;
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if (ppos) {
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*ppos = avio_tell(s->pb) - 4;
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}
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len = avio_rb16(s->pb);
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pts =
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dts = AV_NOPTS_VALUE;
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if (startcode != PRIVATE_STREAM_2)
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{
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/* stuffing */
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for(;;) {
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if (len < 1)
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goto error_redo;
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c = avio_r8(s->pb);
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len--;
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/* XXX: for mpeg1, should test only bit 7 */
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if (c != 0xff)
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break;
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}
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if ((c & 0xc0) == 0x40) {
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/* buffer scale & size */
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avio_r8(s->pb);
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c = avio_r8(s->pb);
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len -= 2;
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}
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if ((c & 0xe0) == 0x20) {
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dts = pts = get_pts(s->pb, c);
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len -= 4;
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if (c & 0x10){
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dts = get_pts(s->pb, -1);
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len -= 5;
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}
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} else if ((c & 0xc0) == 0x80) {
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/* mpeg 2 PES */
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flags = avio_r8(s->pb);
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header_len = avio_r8(s->pb);
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len -= 2;
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if (header_len > len)
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goto error_redo;
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len -= header_len;
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if (flags & 0x80) {
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dts = pts = get_pts(s->pb, -1);
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header_len -= 5;
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if (flags & 0x40) {
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dts = get_pts(s->pb, -1);
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header_len -= 5;
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}
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}
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if (flags & 0x3f && header_len == 0){
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flags &= 0xC0;
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av_log(s, AV_LOG_WARNING, "Further flags set but no bytes left\n");
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}
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if (flags & 0x01) { /* PES extension */
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pes_ext = avio_r8(s->pb);
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header_len--;
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/* Skip PES private data, program packet sequence counter and P-STD buffer */
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skip = (pes_ext >> 4) & 0xb;
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skip += skip & 0x9;
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if (pes_ext & 0x40 || skip > header_len){
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av_log(s, AV_LOG_WARNING, "pes_ext %X is invalid\n", pes_ext);
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pes_ext=skip=0;
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}
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avio_skip(s->pb, skip);
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header_len -= skip;
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if (pes_ext & 0x01) { /* PES extension 2 */
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ext2_len = avio_r8(s->pb);
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header_len--;
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if ((ext2_len & 0x7f) > 0) {
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id_ext = avio_r8(s->pb);
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if ((id_ext & 0x80) == 0)
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startcode = ((startcode & 0xff) << 8) | id_ext;
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header_len--;
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}
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}
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}
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if(header_len < 0)
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goto error_redo;
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avio_skip(s->pb, header_len);
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}
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else if( c!= 0xf )
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goto redo;
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}
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if (startcode == PRIVATE_STREAM_1) {
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startcode = avio_r8(s->pb);
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len--;
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}
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if(len<0)
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goto error_redo;
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if(dts != AV_NOPTS_VALUE && ppos){
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int i;
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for(i=0; i<s->nb_streams; i++){
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if(startcode == s->streams[i]->id &&
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s->pb->seekable /* index useless on streams anyway */) {
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ff_reduce_index(s, i);
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av_add_index_entry(s->streams[i], *ppos, dts, 0, 0, AVINDEX_KEYFRAME /* FIXME keyframe? */);
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}
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}
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}
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*pstart_code = startcode;
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*ppts = pts;
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*pdts = dts;
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return len;
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}
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static int mpegps_read_packet(AVFormatContext *s,
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AVPacket *pkt)
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{
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MpegDemuxContext *m = s->priv_data;
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AVStream *st;
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int len, startcode, i, es_type, ret;
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int lpcm_header_len = -1; //Init to supress warning
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int request_probe= 0;
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enum AVCodecID codec_id = AV_CODEC_ID_NONE;
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enum AVMediaType type;
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int64_t pts, dts, dummy_pos; //dummy_pos is needed for the index building to work
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redo:
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len = mpegps_read_pes_header(s, &dummy_pos, &startcode, &pts, &dts);
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if (len < 0)
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return len;
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if (startcode >= 0x80 && startcode <= 0xcf) {
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if(len < 4)
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goto skip;
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/* audio: skip header */
|
|
avio_r8(s->pb);
|
|
lpcm_header_len = avio_rb16(s->pb);
|
|
len -= 3;
|
|
if (startcode >= 0xb0 && startcode <= 0xbf) {
|
|
/* MLP/TrueHD audio has a 4-byte header */
|
|
avio_r8(s->pb);
|
|
len--;
|
|
}
|
|
}
|
|
|
|
/* now find stream */
|
|
for(i=0;i<s->nb_streams;i++) {
|
|
st = s->streams[i];
|
|
if (st->id == startcode)
|
|
goto found;
|
|
}
|
|
|
|
es_type = m->psm_es_type[startcode & 0xff];
|
|
if(es_type == STREAM_TYPE_VIDEO_MPEG1){
|
|
codec_id = AV_CODEC_ID_MPEG2VIDEO;
|
|
type = AVMEDIA_TYPE_VIDEO;
|
|
} else if(es_type == STREAM_TYPE_VIDEO_MPEG2){
|
|
codec_id = AV_CODEC_ID_MPEG2VIDEO;
|
|
type = AVMEDIA_TYPE_VIDEO;
|
|
} else if(es_type == STREAM_TYPE_AUDIO_MPEG1 ||
|
|
es_type == STREAM_TYPE_AUDIO_MPEG2){
|
|
codec_id = AV_CODEC_ID_MP3;
|
|
type = AVMEDIA_TYPE_AUDIO;
|
|
} else if(es_type == STREAM_TYPE_AUDIO_AAC){
|
|
codec_id = AV_CODEC_ID_AAC;
|
|
type = AVMEDIA_TYPE_AUDIO;
|
|
} else if(es_type == STREAM_TYPE_VIDEO_MPEG4){
|
|
codec_id = AV_CODEC_ID_MPEG4;
|
|
type = AVMEDIA_TYPE_VIDEO;
|
|
} else if(es_type == STREAM_TYPE_VIDEO_H264){
|
|
codec_id = AV_CODEC_ID_H264;
|
|
type = AVMEDIA_TYPE_VIDEO;
|
|
} else if(es_type == STREAM_TYPE_AUDIO_AC3){
|
|
codec_id = AV_CODEC_ID_AC3;
|
|
type = AVMEDIA_TYPE_AUDIO;
|
|
} else if(m->imkh_cctv && es_type == 0x91){
|
|
codec_id = AV_CODEC_ID_PCM_MULAW;
|
|
type = AVMEDIA_TYPE_AUDIO;
|
|
} else if (startcode >= 0x1e0 && startcode <= 0x1ef) {
|
|
static const unsigned char avs_seqh[4] = { 0, 0, 1, 0xb0 };
|
|
unsigned char buf[8];
|
|
avio_read(s->pb, buf, 8);
|
|
avio_seek(s->pb, -8, SEEK_CUR);
|
|
if(!memcmp(buf, avs_seqh, 4) && (buf[6] != 0 || buf[7] != 1))
|
|
codec_id = AV_CODEC_ID_CAVS;
|
|
else
|
|
request_probe= 1;
|
|
type = AVMEDIA_TYPE_VIDEO;
|
|
} else if (startcode == PRIVATE_STREAM_2) {
|
|
type = AVMEDIA_TYPE_DATA;
|
|
codec_id = AV_CODEC_ID_DVD_NAV;
|
|
} else if (startcode >= 0x1c0 && startcode <= 0x1df) {
|
|
type = AVMEDIA_TYPE_AUDIO;
|
|
if (m->sofdec > 0) {
|
|
codec_id = AV_CODEC_ID_ADPCM_ADX;
|
|
// Auto-detect AC-3
|
|
request_probe = 50;
|
|
} else {
|
|
codec_id = AV_CODEC_ID_MP2;
|
|
}
|
|
} else if (startcode >= 0x80 && startcode <= 0x87) {
|
|
type = AVMEDIA_TYPE_AUDIO;
|
|
codec_id = AV_CODEC_ID_AC3;
|
|
} else if ( ( startcode >= 0x88 && startcode <= 0x8f)
|
|
||( startcode >= 0x98 && startcode <= 0x9f)) {
|
|
/* 0x90 - 0x97 is reserved for SDDS in DVD specs */
|
|
type = AVMEDIA_TYPE_AUDIO;
|
|
codec_id = AV_CODEC_ID_DTS;
|
|
} else if (startcode >= 0xa0 && startcode <= 0xaf) {
|
|
type = AVMEDIA_TYPE_AUDIO;
|
|
if(lpcm_header_len == 6) {
|
|
codec_id = AV_CODEC_ID_MLP;
|
|
} else {
|
|
codec_id = AV_CODEC_ID_PCM_DVD;
|
|
}
|
|
} else if (startcode >= 0xb0 && startcode <= 0xbf) {
|
|
type = AVMEDIA_TYPE_AUDIO;
|
|
codec_id = AV_CODEC_ID_TRUEHD;
|
|
} else if (startcode >= 0xc0 && startcode <= 0xcf) {
|
|
/* Used for both AC-3 and E-AC-3 in EVOB files */
|
|
type = AVMEDIA_TYPE_AUDIO;
|
|
codec_id = AV_CODEC_ID_AC3;
|
|
} else if (startcode >= 0x20 && startcode <= 0x3f) {
|
|
type = AVMEDIA_TYPE_SUBTITLE;
|
|
codec_id = AV_CODEC_ID_DVD_SUBTITLE;
|
|
} else if (startcode >= 0xfd55 && startcode <= 0xfd5f) {
|
|
type = AVMEDIA_TYPE_VIDEO;
|
|
codec_id = AV_CODEC_ID_VC1;
|
|
} else {
|
|
skip:
|
|
/* skip packet */
|
|
avio_skip(s->pb, len);
|
|
goto redo;
|
|
}
|
|
/* no stream found: add a new stream */
|
|
st = avformat_new_stream(s, NULL);
|
|
if (!st)
|
|
goto skip;
|
|
st->id = startcode;
|
|
st->codec->codec_type = type;
|
|
st->codec->codec_id = codec_id;
|
|
if (st->codec->codec_id == AV_CODEC_ID_PCM_MULAW) {
|
|
st->codec->channels = 1;
|
|
st->codec->channel_layout = AV_CH_LAYOUT_MONO;
|
|
st->codec->sample_rate = 8000;
|
|
}
|
|
st->request_probe = request_probe;
|
|
st->need_parsing = AVSTREAM_PARSE_FULL;
|
|
found:
|
|
if(st->discard >= AVDISCARD_ALL)
|
|
goto skip;
|
|
if (startcode >= 0xa0 && startcode <= 0xaf) {
|
|
if (lpcm_header_len == 6 && st->codec->codec_id == AV_CODEC_ID_MLP) {
|
|
if (len < 6)
|
|
goto skip;
|
|
avio_skip(s->pb, 6);
|
|
len -=6;
|
|
}
|
|
}
|
|
ret = av_get_packet(s->pb, pkt, len);
|
|
pkt->pts = pts;
|
|
pkt->dts = dts;
|
|
pkt->pos = dummy_pos;
|
|
pkt->stream_index = st->index;
|
|
av_dlog(s, "%d: pts=%0.3f dts=%0.3f size=%d\n",
|
|
pkt->stream_index, pkt->pts / 90000.0, pkt->dts / 90000.0,
|
|
pkt->size);
|
|
|
|
return (ret < 0) ? ret : 0;
|
|
}
|
|
|
|
static int64_t mpegps_read_dts(AVFormatContext *s, int stream_index,
|
|
int64_t *ppos, int64_t pos_limit)
|
|
{
|
|
int len, startcode;
|
|
int64_t pos, pts, dts;
|
|
|
|
pos = *ppos;
|
|
if (avio_seek(s->pb, pos, SEEK_SET) < 0)
|
|
return AV_NOPTS_VALUE;
|
|
|
|
for(;;) {
|
|
len = mpegps_read_pes_header(s, &pos, &startcode, &pts, &dts);
|
|
if (len < 0) {
|
|
av_dlog(s, "none (ret=%d)\n", len);
|
|
return AV_NOPTS_VALUE;
|
|
}
|
|
if (startcode == s->streams[stream_index]->id &&
|
|
dts != AV_NOPTS_VALUE) {
|
|
break;
|
|
}
|
|
avio_skip(s->pb, len);
|
|
}
|
|
av_dlog(s, "pos=0x%"PRIx64" dts=0x%"PRIx64" %0.3f\n",
|
|
pos, dts, dts / 90000.0);
|
|
*ppos = pos;
|
|
return dts;
|
|
}
|
|
|
|
AVInputFormat ff_mpegps_demuxer = {
|
|
.name = "mpeg",
|
|
.long_name = NULL_IF_CONFIG_SMALL("MPEG-PS (MPEG-2 Program Stream)"),
|
|
.priv_data_size = sizeof(MpegDemuxContext),
|
|
.read_probe = mpegps_probe,
|
|
.read_header = mpegps_read_header,
|
|
.read_packet = mpegps_read_packet,
|
|
.read_timestamp = mpegps_read_dts,
|
|
.flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT,
|
|
};
|
|
|
|
#if CONFIG_VOBSUB_DEMUXER
|
|
|
|
#define REF_STRING "# VobSub index file,"
|
|
|
|
static int vobsub_probe(AVProbeData *p)
|
|
{
|
|
if (!strncmp(p->buf, REF_STRING, sizeof(REF_STRING) - 1))
|
|
return AVPROBE_SCORE_MAX;
|
|
return 0;
|
|
}
|
|
|
|
static int vobsub_read_header(AVFormatContext *s)
|
|
{
|
|
int i, ret = 0, header_parsed = 0, langidx = 0;
|
|
MpegDemuxContext *vobsub = s->priv_data;
|
|
char *sub_name = NULL;
|
|
size_t fname_len;
|
|
char *ext, *header_str;
|
|
AVBPrint header;
|
|
int64_t delay = 0;
|
|
AVStream *st = NULL;
|
|
|
|
sub_name = av_strdup(s->filename);
|
|
fname_len = strlen(sub_name);
|
|
ext = sub_name - 3 + fname_len;
|
|
if (fname_len < 4 || *(ext - 1) != '.') {
|
|
av_log(s, AV_LOG_ERROR, "The input index filename is too short "
|
|
"to guess the associated .SUB file\n");
|
|
ret = AVERROR_INVALIDDATA;
|
|
goto end;
|
|
}
|
|
memcpy(ext, !strncmp(ext, "IDX", 3) ? "SUB" : "sub", 3);
|
|
av_log(s, AV_LOG_VERBOSE, "IDX/SUB: %s -> %s\n", s->filename, sub_name);
|
|
ret = avformat_open_input(&vobsub->sub_ctx, sub_name, &ff_mpegps_demuxer, NULL);
|
|
if (ret < 0) {
|
|
av_log(s, AV_LOG_ERROR, "Unable to open %s as MPEG subtitles\n", sub_name);
|
|
goto end;
|
|
}
|
|
|
|
av_bprint_init(&header, 0, AV_BPRINT_SIZE_UNLIMITED);
|
|
while (!url_feof(s->pb)) {
|
|
char line[2048];
|
|
int len = ff_get_line(s->pb, line, sizeof(line));
|
|
|
|
if (!len)
|
|
break;
|
|
|
|
line[strcspn(line, "\r\n")] = 0;
|
|
|
|
if (!strncmp(line, "id:", 3)) {
|
|
int n, stream_id = 0;
|
|
char id[64] = {0};
|
|
|
|
n = sscanf(line, "id: %63[^,], index: %u", id, &stream_id);
|
|
if (n != 2) {
|
|
av_log(s, AV_LOG_WARNING, "Unable to parse index line '%s', "
|
|
"assuming 'id: und, index: 0'\n", line);
|
|
strcpy(id, "und");
|
|
stream_id = 0;
|
|
}
|
|
|
|
if (stream_id >= FF_ARRAY_ELEMS(vobsub->q)) {
|
|
av_log(s, AV_LOG_ERROR, "Maximum number of subtitles streams reached\n");
|
|
ret = AVERROR(EINVAL);
|
|
goto end;
|
|
}
|
|
|
|
st = avformat_new_stream(s, NULL);
|
|
if (!st) {
|
|
ret = AVERROR(ENOMEM);
|
|
goto end;
|
|
}
|
|
st->id = stream_id;
|
|
st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
|
|
st->codec->codec_id = AV_CODEC_ID_DVD_SUBTITLE;
|
|
avpriv_set_pts_info(st, 64, 1, 1000);
|
|
av_dict_set(&st->metadata, "language", id, 0);
|
|
av_log(s, AV_LOG_DEBUG, "IDX stream[%d] id=%s\n", stream_id, id);
|
|
header_parsed = 1;
|
|
|
|
} else if (st && !strncmp(line, "timestamp:", 10)) {
|
|
AVPacket *sub;
|
|
int hh, mm, ss, ms;
|
|
int64_t pos, timestamp;
|
|
const char *p = line + 10;
|
|
|
|
if (!s->nb_streams) {
|
|
av_log(s, AV_LOG_ERROR, "Timestamp declared before any stream\n");
|
|
ret = AVERROR_INVALIDDATA;
|
|
goto end;
|
|
}
|
|
|
|
if (sscanf(p, "%02d:%02d:%02d:%03d, filepos: %"SCNx64,
|
|
&hh, &mm, &ss, &ms, &pos) != 5) {
|
|
av_log(s, AV_LOG_ERROR, "Unable to parse timestamp line '%s', "
|
|
"abort parsing\n", line);
|
|
break;
|
|
}
|
|
timestamp = (hh*3600LL + mm*60LL + ss) * 1000LL + ms + delay;
|
|
timestamp = av_rescale_q(timestamp, (AVRational){1,1000}, st->time_base);
|
|
|
|
sub = ff_subtitles_queue_insert(&vobsub->q[s->nb_streams - 1], "", 0, 0);
|
|
if (!sub) {
|
|
ret = AVERROR(ENOMEM);
|
|
goto end;
|
|
}
|
|
sub->pos = pos;
|
|
sub->pts = timestamp;
|
|
sub->stream_index = s->nb_streams - 1;
|
|
|
|
} else if (st && !strncmp(line, "alt:", 4)) {
|
|
const char *p = line + 4;
|
|
|
|
while (*p == ' ')
|
|
p++;
|
|
av_dict_set(&st->metadata, "title", p, 0);
|
|
av_log(s, AV_LOG_DEBUG, "IDX stream[%d] name=%s\n", st->id, p);
|
|
header_parsed = 1;
|
|
|
|
} else if (!strncmp(line, "delay:", 6)) {
|
|
int sign = 1, hh = 0, mm = 0, ss = 0, ms = 0;
|
|
const char *p = line + 6;
|
|
|
|
while (*p == ' ')
|
|
p++;
|
|
if (*p == '-' || *p == '+') {
|
|
sign = *p == '-' ? -1 : 1;
|
|
p++;
|
|
}
|
|
sscanf(p, "%d:%d:%d:%d", &hh, &mm, &ss, &ms);
|
|
delay = ((hh*3600LL + mm*60LL + ss) * 1000LL + ms) * sign;
|
|
|
|
} else if (!strncmp(line, "langidx:", 8)) {
|
|
const char *p = line + 8;
|
|
|
|
if (sscanf(p, "%d", &langidx) != 1)
|
|
av_log(s, AV_LOG_ERROR, "Invalid langidx specified\n");
|
|
|
|
} else if (!header_parsed) {
|
|
if (line[0] && line[0] != '#')
|
|
av_bprintf(&header, "%s\n", line);
|
|
}
|
|
}
|
|
|
|
if (langidx < s->nb_streams)
|
|
s->streams[langidx]->disposition |= AV_DISPOSITION_DEFAULT;
|
|
|
|
for (i = 0; i < s->nb_streams; i++) {
|
|
vobsub->q[i].sort = SUB_SORT_POS_TS;
|
|
ff_subtitles_queue_finalize(&vobsub->q[i]);
|
|
}
|
|
|
|
if (!av_bprint_is_complete(&header)) {
|
|
av_bprint_finalize(&header, NULL);
|
|
ret = AVERROR(ENOMEM);
|
|
goto end;
|
|
}
|
|
av_bprint_finalize(&header, &header_str);
|
|
for (i = 0; i < s->nb_streams; i++) {
|
|
AVStream *sub_st = s->streams[i];
|
|
sub_st->codec->extradata = av_strdup(header_str);
|
|
sub_st->codec->extradata_size = header.len;
|
|
}
|
|
av_free(header_str);
|
|
|
|
end:
|
|
av_free(sub_name);
|
|
return ret;
|
|
}
|
|
|
|
#define FAIL(r) do { ret = r; goto fail; } while (0)
|
|
|
|
static int vobsub_read_packet(AVFormatContext *s, AVPacket *pkt)
|
|
{
|
|
MpegDemuxContext *vobsub = s->priv_data;
|
|
FFDemuxSubtitlesQueue *q;
|
|
AVIOContext *pb = vobsub->sub_ctx->pb;
|
|
int ret, psize, total_read = 0, i;
|
|
AVPacket idx_pkt;
|
|
|
|
int64_t min_ts = INT64_MAX;
|
|
int sid = 0;
|
|
for (i = 0; i < s->nb_streams; i++) {
|
|
FFDemuxSubtitlesQueue *tmpq = &vobsub->q[i];
|
|
int64_t ts = tmpq->subs[tmpq->current_sub_idx].pts;
|
|
if (ts < min_ts) {
|
|
min_ts = ts;
|
|
sid = i;
|
|
}
|
|
}
|
|
q = &vobsub->q[sid];
|
|
ret = ff_subtitles_queue_read_packet(q, &idx_pkt);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
/* compute maximum packet size using the next packet position. This is
|
|
* useful when the len in the header is non-sense */
|
|
if (q->current_sub_idx < q->nb_subs) {
|
|
psize = q->subs[q->current_sub_idx].pos - idx_pkt.pos;
|
|
} else {
|
|
int64_t fsize = avio_size(pb);
|
|
psize = fsize < 0 ? 0xffff : fsize - idx_pkt.pos;
|
|
}
|
|
|
|
avio_seek(pb, idx_pkt.pos, SEEK_SET);
|
|
|
|
av_init_packet(pkt);
|
|
pkt->size = 0;
|
|
pkt->data = NULL;
|
|
|
|
do {
|
|
int n, to_read, startcode;
|
|
int64_t pts, dts;
|
|
int64_t old_pos = avio_tell(pb), new_pos;
|
|
int pkt_size;
|
|
|
|
ret = mpegps_read_pes_header(vobsub->sub_ctx, NULL, &startcode, &pts, &dts);
|
|
if (ret < 0) {
|
|
if (pkt->size) // raise packet even if incomplete
|
|
break;
|
|
FAIL(ret);
|
|
}
|
|
to_read = ret & 0xffff;
|
|
new_pos = avio_tell(pb);
|
|
pkt_size = ret + (new_pos - old_pos);
|
|
|
|
/* this prevents reads above the current packet */
|
|
if (total_read + pkt_size > psize)
|
|
break;
|
|
total_read += pkt_size;
|
|
|
|
/* the current chunk doesn't match the stream index (unlikely) */
|
|
if ((startcode & 0x1f) != idx_pkt.stream_index)
|
|
break;
|
|
|
|
ret = av_grow_packet(pkt, to_read);
|
|
if (ret < 0)
|
|
FAIL(ret);
|
|
|
|
n = avio_read(pb, pkt->data + (pkt->size - to_read), to_read);
|
|
if (n < to_read)
|
|
pkt->size -= to_read - n;
|
|
} while (total_read < psize);
|
|
|
|
pkt->pts = pkt->dts = idx_pkt.pts;
|
|
pkt->pos = idx_pkt.pos;
|
|
pkt->stream_index = idx_pkt.stream_index;
|
|
|
|
av_free_packet(&idx_pkt);
|
|
return 0;
|
|
|
|
fail:
|
|
av_free_packet(pkt);
|
|
av_free_packet(&idx_pkt);
|
|
return ret;
|
|
}
|
|
|
|
static int vobsub_read_seek(AVFormatContext *s, int stream_index,
|
|
int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
|
|
{
|
|
MpegDemuxContext *vobsub = s->priv_data;
|
|
|
|
/* Rescale requested timestamps based on the first stream (timebase is the
|
|
* same for all subtitles stream within a .idx/.sub). Rescaling is done just
|
|
* like in avformat_seek_file(). */
|
|
if (stream_index == -1 && s->nb_streams != 1) {
|
|
int i, ret = 0;
|
|
AVRational time_base = s->streams[0]->time_base;
|
|
ts = av_rescale_q(ts, AV_TIME_BASE_Q, time_base);
|
|
min_ts = av_rescale_rnd(min_ts, time_base.den,
|
|
time_base.num * (int64_t)AV_TIME_BASE,
|
|
AV_ROUND_UP | AV_ROUND_PASS_MINMAX);
|
|
max_ts = av_rescale_rnd(max_ts, time_base.den,
|
|
time_base.num * (int64_t)AV_TIME_BASE,
|
|
AV_ROUND_DOWN | AV_ROUND_PASS_MINMAX);
|
|
for (i = 0; i < s->nb_streams; i++) {
|
|
int r = ff_subtitles_queue_seek(&vobsub->q[i], s, stream_index,
|
|
min_ts, ts, max_ts, flags);
|
|
if (r < 0)
|
|
ret = r;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
if (stream_index == -1) // only 1 stream
|
|
stream_index = 0;
|
|
return ff_subtitles_queue_seek(&vobsub->q[stream_index], s, stream_index,
|
|
min_ts, ts, max_ts, flags);
|
|
}
|
|
|
|
static int vobsub_read_close(AVFormatContext *s)
|
|
{
|
|
int i;
|
|
MpegDemuxContext *vobsub = s->priv_data;
|
|
|
|
for (i = 0; i < s->nb_streams; i++)
|
|
ff_subtitles_queue_clean(&vobsub->q[i]);
|
|
if (vobsub->sub_ctx)
|
|
avformat_close_input(&vobsub->sub_ctx);
|
|
return 0;
|
|
}
|
|
|
|
AVInputFormat ff_vobsub_demuxer = {
|
|
.name = "vobsub",
|
|
.long_name = NULL_IF_CONFIG_SMALL("VobSub subtitle format"),
|
|
.priv_data_size = sizeof(MpegDemuxContext),
|
|
.read_probe = vobsub_probe,
|
|
.read_header = vobsub_read_header,
|
|
.read_packet = vobsub_read_packet,
|
|
.read_seek2 = vobsub_read_seek,
|
|
.read_close = vobsub_read_close,
|
|
.flags = AVFMT_SHOW_IDS,
|
|
.extensions = "idx",
|
|
};
|
|
#endif
|