mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-11-21 10:55:51 +02:00
578 lines
18 KiB
C
578 lines
18 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 Libav.
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*
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* Libav 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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* Libav 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 Libav; 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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#undef NDEBUG
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#include <assert.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(uint8_t *p, uint8_t *end)
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{
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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 ||
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(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)
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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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{
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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 i;
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int sys = 0, pspack = 0, priv1 = 0, vid = 0;
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int audio = 0, invalid = 0, 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)
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sys++;
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else if (code == PACK_START_CODE && pack)
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pspack++;
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else if ((code & 0xf0) == VIDEO_ID && pes)
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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) {
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audio++;
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i += len;
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} else if (code == PRIVATE_STREAM_1 && pes) {
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priv1++;
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i += len;
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} else if ((code & 0xf0) == VIDEO_ID && !pes)
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invalid++;
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else if ((code & 0xe0) == AUDIO_ID && !pes)
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invalid++;
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else if (code == PRIVATE_STREAM_1 && !pes)
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invalid++;
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}
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}
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if (vid + audio > invalid) /* 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 pspack > 2 ? AVPROBE_SCORE_EXTENSION + 2
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: 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
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: AVPROBE_SCORE_EXTENSION / 2; // 1 more than .mpg
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if ((!!vid ^ !!audio) && (audio > 4 || vid > 1) && !sys &&
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!pspack && p->buf_size > 2048 && vid + audio > invalid) /* PES stream */
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return (audio > 12 || vid > 3) ? AVPROBE_SCORE_EXTENSION + 2
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: 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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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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} 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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const char *sofdec = "Sofdec";
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int v, i = 0;
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m->header_state = 0xff;
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s->ctx_flags |= AVFMTCTX_NOHEADER;
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m->sofdec = -1;
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do {
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v = avio_r8(s->pb);
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m->header_state = m->header_state << 8 | v;
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m->sofdec++;
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} while (v == sofdec[i] && i++ < 6);
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m->sofdec = (m->sofdec == 6) ? 1 : 0;
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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 (pb->eof_reached)
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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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/* 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 (s->pb->eof_reached)
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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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len = avio_rb16(s->pb);
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if (!m->sofdec) {
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while (len-- >= 6) {
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if (avio_r8(s->pb) == 'S') {
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uint8_t buf[5];
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avio_read(s->pb, buf, sizeof(buf));
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m->sofdec = !memcmp(buf, "ofdec", 5);
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len -= sizeof(buf);
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break;
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}
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}
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m->sofdec -= !m->sofdec;
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}
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avio_skip(s->pb, len);
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goto redo;
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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) || (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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/* 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 =
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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
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* 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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} else if (c != 0xf)
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goto redo;
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if (startcode == PRIVATE_STREAM_1 && !m->psm_es_type[startcode & 0xff]) {
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startcode = avio_r8(s->pb);
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len--;
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if (startcode >= 0x80 && startcode <= 0xcf) {
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/* audio: skip header */
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avio_r8(s->pb);
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avio_r8(s->pb);
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avio_r8(s->pb);
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len -= 3;
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if (startcode >= 0xb0 && startcode <= 0xbf) {
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/* MLP/TrueHD audio has a 4-byte header */
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avio_r8(s->pb);
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len--;
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}
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}
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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,
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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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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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uint8_t av_uninit(dvdaudio_substream_type);
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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 == 0x1bd) {
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dvdaudio_substream_type = avio_r8(s->pb);
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avio_skip(s->pb, 3);
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len -= 4;
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}
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/* now find stream */
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for (i = 0; i < s->nb_streams; i++) {
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st = s->streams[i];
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if (st->id == startcode)
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goto found;
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}
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es_type = m->psm_es_type[startcode & 0xff];
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if (es_type > 0 && es_type != STREAM_TYPE_PRIVATE_DATA) {
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if (es_type == STREAM_TYPE_VIDEO_MPEG1) {
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codec_id = AV_CODEC_ID_MPEG2VIDEO;
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type = AVMEDIA_TYPE_VIDEO;
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} else if (es_type == STREAM_TYPE_VIDEO_MPEG2) {
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codec_id = AV_CODEC_ID_MPEG2VIDEO;
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type = AVMEDIA_TYPE_VIDEO;
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} else if (es_type == STREAM_TYPE_AUDIO_MPEG1 ||
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es_type == STREAM_TYPE_AUDIO_MPEG2) {
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codec_id = AV_CODEC_ID_MP3;
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type = AVMEDIA_TYPE_AUDIO;
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} else if (es_type == STREAM_TYPE_AUDIO_AAC) {
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codec_id = AV_CODEC_ID_AAC;
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type = AVMEDIA_TYPE_AUDIO;
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} else if (es_type == STREAM_TYPE_VIDEO_MPEG4) {
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codec_id = AV_CODEC_ID_MPEG4;
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type = AVMEDIA_TYPE_VIDEO;
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} else if (es_type == STREAM_TYPE_VIDEO_H264) {
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codec_id = AV_CODEC_ID_H264;
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type = AVMEDIA_TYPE_VIDEO;
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} else if (es_type == STREAM_TYPE_AUDIO_AC3) {
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codec_id = AV_CODEC_ID_AC3;
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type = AVMEDIA_TYPE_AUDIO;
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} else {
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goto skip;
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}
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} else if (startcode >= 0x1e0 && startcode <= 0x1ef) {
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static const unsigned char avs_seqh[4] = { 0, 0, 1, 0xb0 };
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unsigned char buf[8];
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avio_read(s->pb, buf, 8);
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avio_seek(s->pb, -8, SEEK_CUR);
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if (!memcmp(buf, avs_seqh, 4) && (buf[6] != 0 || buf[7] != 1))
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codec_id = AV_CODEC_ID_CAVS;
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else
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codec_id = AV_CODEC_ID_PROBE;
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type = AVMEDIA_TYPE_VIDEO;
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} else if (startcode >= 0x1c0 && startcode <= 0x1df) {
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type = AVMEDIA_TYPE_AUDIO;
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codec_id = m->sofdec > 0 ? AV_CODEC_ID_ADPCM_ADX : AV_CODEC_ID_MP2;
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} else if (startcode >= 0x80 && startcode <= 0x87) {
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type = AVMEDIA_TYPE_AUDIO;
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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;
|
|
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 if (startcode == 0x1bd) {
|
|
// check dvd audio substream type
|
|
type = AVMEDIA_TYPE_AUDIO;
|
|
switch (dvdaudio_substream_type & 0xe0) {
|
|
case 0xa0:
|
|
codec_id = AV_CODEC_ID_PCM_DVD;
|
|
break;
|
|
case 0x80:
|
|
if ((dvdaudio_substream_type & 0xf8) == 0x88)
|
|
codec_id = AV_CODEC_ID_DTS;
|
|
else
|
|
codec_id = AV_CODEC_ID_AC3;
|
|
break;
|
|
default:
|
|
av_log(s, AV_LOG_ERROR, "Unknown 0x1bd sub-stream\n");
|
|
goto skip;
|
|
}
|
|
} 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;
|
|
st->need_parsing = AVSTREAM_PARSE_FULL;
|
|
|
|
found:
|
|
if (st->discard >= AVDISCARD_ALL)
|
|
goto skip;
|
|
ret = av_get_packet(s->pb, pkt, len);
|
|
|
|
pkt->pts = pts;
|
|
pkt->dts = dts;
|
|
pkt->pos = dummy_pos;
|
|
pkt->stream_index = st->index;
|
|
av_log(s, AV_LOG_TRACE, "%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_log(s, AV_LOG_TRACE, "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_log(s, AV_LOG_TRACE, "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,
|
|
};
|