mirror of
https://github.com/FFmpeg/FFmpeg.git
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30a43f2d09
Originally committed as revision 5083 to svn://svn.ffmpeg.org/ffmpeg/trunk
1798 lines
56 KiB
C
1798 lines
56 KiB
C
/*
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* MPEG1/2 mux/demux
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* Copyright (c) 2000, 2001, 2002 Fabrice Bellard.
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*
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* This library 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 of the License, or (at your option) any later version.
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*
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* This library 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 this library; 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 "bitstream.h"
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#define MAX_PAYLOAD_SIZE 4096
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//#define DEBUG_SEEK
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#undef NDEBUG
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#include <assert.h>
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typedef struct PacketDesc {
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int64_t pts;
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int64_t dts;
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int size;
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int unwritten_size;
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int flags;
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struct PacketDesc *next;
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} PacketDesc;
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typedef struct {
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FifoBuffer fifo;
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uint8_t id;
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int max_buffer_size; /* in bytes */
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int buffer_index;
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PacketDesc *predecode_packet;
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PacketDesc *premux_packet;
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PacketDesc **next_packet;
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int packet_number;
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uint8_t lpcm_header[3];
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int lpcm_align;
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uint8_t *fifo_iframe_ptr;
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int align_iframe;
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int64_t vobu_start_pts;
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} StreamInfo;
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typedef struct {
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int packet_size; /* required packet size */
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int packet_number;
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int pack_header_freq; /* frequency (in packets^-1) at which we send pack headers */
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int system_header_freq;
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int system_header_size;
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int mux_rate; /* bitrate in units of 50 bytes/s */
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/* stream info */
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int audio_bound;
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int video_bound;
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int is_mpeg2;
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int is_vcd;
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int is_svcd;
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int is_dvd;
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int64_t last_scr; /* current system clock */
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double vcd_padding_bitrate; //FIXME floats
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int64_t vcd_padding_bytes_written;
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} MpegMuxContext;
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#define PACK_START_CODE ((unsigned int)0x000001ba)
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#define SYSTEM_HEADER_START_CODE ((unsigned int)0x000001bb)
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#define SEQUENCE_END_CODE ((unsigned int)0x000001b7)
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#define PACKET_START_CODE_MASK ((unsigned int)0xffffff00)
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#define PACKET_START_CODE_PREFIX ((unsigned int)0x00000100)
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#define ISO_11172_END_CODE ((unsigned int)0x000001b9)
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/* mpeg2 */
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#define PROGRAM_STREAM_MAP 0x1bc
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#define PRIVATE_STREAM_1 0x1bd
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#define PADDING_STREAM 0x1be
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#define PRIVATE_STREAM_2 0x1bf
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#define AUDIO_ID 0xc0
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#define VIDEO_ID 0xe0
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#define AC3_ID 0x80
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#define DTS_ID 0x8a
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#define LPCM_ID 0xa0
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#define SUB_ID 0x20
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#define STREAM_TYPE_VIDEO_MPEG1 0x01
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#define STREAM_TYPE_VIDEO_MPEG2 0x02
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#define STREAM_TYPE_AUDIO_MPEG1 0x03
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#define STREAM_TYPE_AUDIO_MPEG2 0x04
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#define STREAM_TYPE_PRIVATE_SECTION 0x05
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#define STREAM_TYPE_PRIVATE_DATA 0x06
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#define STREAM_TYPE_AUDIO_AAC 0x0f
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#define STREAM_TYPE_VIDEO_MPEG4 0x10
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#define STREAM_TYPE_VIDEO_H264 0x1b
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#define STREAM_TYPE_AUDIO_AC3 0x81
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#define STREAM_TYPE_AUDIO_DTS 0x8a
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static const int lpcm_freq_tab[4] = { 48000, 96000, 44100, 32000 };
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#ifdef CONFIG_MUXERS
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static AVOutputFormat mpeg1system_mux;
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static AVOutputFormat mpeg1vcd_mux;
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static AVOutputFormat mpeg2vob_mux;
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static AVOutputFormat mpeg2svcd_mux;
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static AVOutputFormat mpeg2dvd_mux;
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static int put_pack_header(AVFormatContext *ctx,
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uint8_t *buf, int64_t timestamp)
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{
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MpegMuxContext *s = ctx->priv_data;
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PutBitContext pb;
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init_put_bits(&pb, buf, 128);
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put_bits(&pb, 32, PACK_START_CODE);
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if (s->is_mpeg2) {
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put_bits(&pb, 2, 0x1);
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} else {
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put_bits(&pb, 4, 0x2);
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}
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put_bits(&pb, 3, (uint32_t)((timestamp >> 30) & 0x07));
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put_bits(&pb, 1, 1);
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put_bits(&pb, 15, (uint32_t)((timestamp >> 15) & 0x7fff));
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put_bits(&pb, 1, 1);
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put_bits(&pb, 15, (uint32_t)((timestamp) & 0x7fff));
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put_bits(&pb, 1, 1);
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if (s->is_mpeg2) {
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/* clock extension */
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put_bits(&pb, 9, 0);
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}
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put_bits(&pb, 1, 1);
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put_bits(&pb, 22, s->mux_rate);
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put_bits(&pb, 1, 1);
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if (s->is_mpeg2) {
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put_bits(&pb, 1, 1);
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put_bits(&pb, 5, 0x1f); /* reserved */
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put_bits(&pb, 3, 0); /* stuffing length */
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}
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flush_put_bits(&pb);
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return pbBufPtr(&pb) - pb.buf;
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}
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static int put_system_header(AVFormatContext *ctx, uint8_t *buf,int only_for_stream_id)
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{
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MpegMuxContext *s = ctx->priv_data;
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int size, i, private_stream_coded, id;
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PutBitContext pb;
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init_put_bits(&pb, buf, 128);
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put_bits(&pb, 32, SYSTEM_HEADER_START_CODE);
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put_bits(&pb, 16, 0);
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put_bits(&pb, 1, 1);
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put_bits(&pb, 22, s->mux_rate); /* maximum bit rate of the multiplexed stream */
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put_bits(&pb, 1, 1); /* marker */
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if (s->is_vcd && only_for_stream_id==VIDEO_ID) {
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/* This header applies only to the video stream (see VCD standard p. IV-7)*/
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put_bits(&pb, 6, 0);
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} else
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put_bits(&pb, 6, s->audio_bound);
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if (s->is_vcd) {
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/* see VCD standard, p. IV-7*/
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put_bits(&pb, 1, 0);
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put_bits(&pb, 1, 1);
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} else {
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put_bits(&pb, 1, 0); /* variable bitrate*/
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put_bits(&pb, 1, 0); /* non constrainted bit stream */
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}
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if (s->is_vcd || s->is_dvd) {
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/* see VCD standard p IV-7 */
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put_bits(&pb, 1, 1); /* audio locked */
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put_bits(&pb, 1, 1); /* video locked */
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} else {
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put_bits(&pb, 1, 0); /* audio locked */
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put_bits(&pb, 1, 0); /* video locked */
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}
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put_bits(&pb, 1, 1); /* marker */
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if (s->is_vcd && only_for_stream_id==AUDIO_ID) {
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/* This header applies only to the audio stream (see VCD standard p. IV-7)*/
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put_bits(&pb, 5, 0);
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} else
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put_bits(&pb, 5, s->video_bound);
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if (s->is_dvd) {
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put_bits(&pb, 1, 0); /* packet_rate_restriction_flag */
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put_bits(&pb, 7, 0x7f); /* reserved byte */
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} else
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put_bits(&pb, 8, 0xff); /* reserved byte */
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/* DVD-Video Stream_bound entries
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id (0xB9) video, maximum P-STD for stream 0xE0. (P-STD_buffer_bound_scale = 1)
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id (0xB8) audio, maximum P-STD for any MPEG audio (0xC0 to 0xC7) streams. If there are none set to 4096 (32x128). (P-STD_buffer_bound_scale = 0)
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id (0xBD) private stream 1 (audio other than MPEG and subpictures). (P-STD_buffer_bound_scale = 1)
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id (0xBF) private stream 2, NAV packs, set to 2x1024. */
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if (s->is_dvd) {
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int P_STD_max_video = 0;
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int P_STD_max_mpeg_audio = 0;
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int P_STD_max_mpeg_PS1 = 0;
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for(i=0;i<ctx->nb_streams;i++) {
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StreamInfo *stream = ctx->streams[i]->priv_data;
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id = stream->id;
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if (id == 0xbd && stream->max_buffer_size > P_STD_max_mpeg_PS1) {
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P_STD_max_mpeg_PS1 = stream->max_buffer_size;
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} else if (id >= 0xc0 && id <= 0xc7 && stream->max_buffer_size > P_STD_max_mpeg_audio) {
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P_STD_max_mpeg_audio = stream->max_buffer_size;
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} else if (id == 0xe0 && stream->max_buffer_size > P_STD_max_video) {
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P_STD_max_video = stream->max_buffer_size;
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}
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}
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/* video */
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put_bits(&pb, 8, 0xb9); /* stream ID */
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put_bits(&pb, 2, 3);
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put_bits(&pb, 1, 1);
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put_bits(&pb, 13, P_STD_max_video / 1024);
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/* audio */
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if (P_STD_max_mpeg_audio == 0)
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P_STD_max_mpeg_audio = 4096;
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put_bits(&pb, 8, 0xb8); /* stream ID */
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put_bits(&pb, 2, 3);
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put_bits(&pb, 1, 0);
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put_bits(&pb, 13, P_STD_max_mpeg_audio / 128);
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/* private stream 1 */
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put_bits(&pb, 8, 0xbd); /* stream ID */
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put_bits(&pb, 2, 3);
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put_bits(&pb, 1, 0);
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put_bits(&pb, 13, P_STD_max_mpeg_PS1 / 128);
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/* private stream 2 */
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put_bits(&pb, 8, 0xbf); /* stream ID */
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put_bits(&pb, 2, 3);
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put_bits(&pb, 1, 1);
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put_bits(&pb, 13, 2);
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}
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else {
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/* audio stream info */
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private_stream_coded = 0;
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for(i=0;i<ctx->nb_streams;i++) {
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StreamInfo *stream = ctx->streams[i]->priv_data;
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/* For VCDs, only include the stream info for the stream
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that the pack which contains this system belongs to.
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(see VCD standard p. IV-7) */
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if ( !s->is_vcd || stream->id==only_for_stream_id
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|| only_for_stream_id==0) {
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id = stream->id;
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if (id < 0xc0) {
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/* special case for private streams (AC3 use that) */
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if (private_stream_coded)
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continue;
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private_stream_coded = 1;
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id = 0xbd;
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}
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put_bits(&pb, 8, id); /* stream ID */
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put_bits(&pb, 2, 3);
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if (id < 0xe0) {
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/* audio */
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put_bits(&pb, 1, 0);
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put_bits(&pb, 13, stream->max_buffer_size / 128);
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} else {
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/* video */
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put_bits(&pb, 1, 1);
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put_bits(&pb, 13, stream->max_buffer_size / 1024);
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}
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}
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}
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}
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flush_put_bits(&pb);
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size = pbBufPtr(&pb) - pb.buf;
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/* patch packet size */
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buf[4] = (size - 6) >> 8;
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buf[5] = (size - 6) & 0xff;
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return size;
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}
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static int get_system_header_size(AVFormatContext *ctx)
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{
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int buf_index, i, private_stream_coded;
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StreamInfo *stream;
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MpegMuxContext *s = ctx->priv_data;
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if (s->is_dvd)
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return 18; // DVD-Video system headers are 18 bytes fixed length.
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buf_index = 12;
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private_stream_coded = 0;
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for(i=0;i<ctx->nb_streams;i++) {
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stream = ctx->streams[i]->priv_data;
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if (stream->id < 0xc0) {
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if (private_stream_coded)
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continue;
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private_stream_coded = 1;
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}
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buf_index += 3;
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}
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return buf_index;
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}
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static int mpeg_mux_init(AVFormatContext *ctx)
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{
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MpegMuxContext *s = ctx->priv_data;
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int bitrate, i, mpa_id, mpv_id, mps_id, ac3_id, dts_id, lpcm_id, j;
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AVStream *st;
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StreamInfo *stream;
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int audio_bitrate;
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int video_bitrate;
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s->packet_number = 0;
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s->is_vcd = (ctx->oformat == &mpeg1vcd_mux);
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s->is_svcd = (ctx->oformat == &mpeg2svcd_mux);
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s->is_mpeg2 = (ctx->oformat == &mpeg2vob_mux || ctx->oformat == &mpeg2svcd_mux || ctx->oformat == &mpeg2dvd_mux);
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s->is_dvd = (ctx->oformat == &mpeg2dvd_mux);
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if(ctx->packet_size)
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s->packet_size = ctx->packet_size;
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else
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s->packet_size = 2048;
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s->vcd_padding_bytes_written = 0;
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s->vcd_padding_bitrate=0;
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s->audio_bound = 0;
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s->video_bound = 0;
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mpa_id = AUDIO_ID;
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ac3_id = AC3_ID;
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dts_id = DTS_ID;
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mpv_id = VIDEO_ID;
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mps_id = SUB_ID;
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lpcm_id = LPCM_ID;
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for(i=0;i<ctx->nb_streams;i++) {
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st = ctx->streams[i];
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stream = av_mallocz(sizeof(StreamInfo));
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if (!stream)
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goto fail;
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st->priv_data = stream;
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av_set_pts_info(st, 64, 1, 90000);
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switch(st->codec->codec_type) {
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case CODEC_TYPE_AUDIO:
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if (st->codec->codec_id == CODEC_ID_AC3) {
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stream->id = ac3_id++;
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} else if (st->codec->codec_id == CODEC_ID_DTS) {
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stream->id = dts_id++;
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} else if (st->codec->codec_id == CODEC_ID_PCM_S16BE) {
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stream->id = lpcm_id++;
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for(j = 0; j < 4; j++) {
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if (lpcm_freq_tab[j] == st->codec->sample_rate)
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break;
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}
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if (j == 4)
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goto fail;
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if (st->codec->channels > 8)
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return -1;
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stream->lpcm_header[0] = 0x0c;
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stream->lpcm_header[1] = (st->codec->channels - 1) | (j << 4);
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stream->lpcm_header[2] = 0x80;
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stream->lpcm_align = st->codec->channels * 2;
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} else {
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stream->id = mpa_id++;
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}
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/* This value HAS to be used for VCD (see VCD standard, p. IV-7).
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Right now it is also used for everything else.*/
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stream->max_buffer_size = 4 * 1024;
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s->audio_bound++;
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break;
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case CODEC_TYPE_VIDEO:
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stream->id = mpv_id++;
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if (st->codec->rc_buffer_size)
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stream->max_buffer_size = 6*1024 + st->codec->rc_buffer_size/8;
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else
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stream->max_buffer_size = 230*1024; //FIXME this is probably too small as default
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#if 0
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/* see VCD standard, p. IV-7*/
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stream->max_buffer_size = 46 * 1024;
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else
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/* This value HAS to be used for SVCD (see SVCD standard, p. 26 V.2.3.2).
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Right now it is also used for everything else.*/
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stream->max_buffer_size = 230 * 1024;
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#endif
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s->video_bound++;
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break;
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case CODEC_TYPE_SUBTITLE:
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stream->id = mps_id++;
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stream->max_buffer_size = 16 * 1024;
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break;
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default:
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return -1;
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}
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fifo_init(&stream->fifo, 16);
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}
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bitrate = 0;
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audio_bitrate = 0;
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video_bitrate = 0;
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for(i=0;i<ctx->nb_streams;i++) {
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int codec_rate;
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st = ctx->streams[i];
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stream = (StreamInfo*) st->priv_data;
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if(st->codec->rc_max_rate || stream->id==VIDEO_ID)
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codec_rate= st->codec->rc_max_rate;
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else
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codec_rate= st->codec->bit_rate;
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|
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if(!codec_rate)
|
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codec_rate= (1<<21)*8*50/ctx->nb_streams;
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bitrate += codec_rate;
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|
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if (stream->id==AUDIO_ID)
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audio_bitrate += codec_rate;
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else if (stream->id==VIDEO_ID)
|
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video_bitrate += codec_rate;
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}
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|
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if(ctx->mux_rate){
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s->mux_rate= (ctx->mux_rate + (8 * 50) - 1) / (8 * 50);
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} else {
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/* we increase slightly the bitrate to take into account the
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headers. XXX: compute it exactly */
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bitrate += bitrate*5/100;
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bitrate += 10000;
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s->mux_rate = (bitrate + (8 * 50) - 1) / (8 * 50);
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}
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|
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if (s->is_vcd) {
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double overhead_rate;
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|
|
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/* The VCD standard mandates that the mux_rate field is 3528
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(see standard p. IV-6).
|
|
The value is actually "wrong", i.e. if you calculate
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it using the normal formula and the 75 sectors per second transfer
|
|
rate you get a different value because the real pack size is 2324,
|
|
not 2352. But the standard explicitly specifies that the mux_rate
|
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field in the header must have this value.*/
|
|
// s->mux_rate=2352 * 75 / 50; /* = 3528*/
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|
|
/* The VCD standard states that the muxed stream must be
|
|
exactly 75 packs / second (the data rate of a single speed cdrom).
|
|
Since the video bitrate (probably 1150000 bits/sec) will be below
|
|
the theoretical maximum we have to add some padding packets
|
|
to make up for the lower data rate.
|
|
(cf. VCD standard p. IV-6 )*/
|
|
|
|
/* Add the header overhead to the data rate.
|
|
2279 data bytes per audio pack, 2294 data bytes per video pack*/
|
|
overhead_rate = ((audio_bitrate / 8.0) / 2279) * (2324 - 2279);
|
|
overhead_rate += ((video_bitrate / 8.0) / 2294) * (2324 - 2294);
|
|
overhead_rate *= 8;
|
|
|
|
/* Add padding so that the full bitrate is 2324*75 bytes/sec */
|
|
s->vcd_padding_bitrate = 2324 * 75 * 8 - (bitrate + overhead_rate);
|
|
}
|
|
|
|
if (s->is_vcd || s->is_mpeg2)
|
|
/* every packet */
|
|
s->pack_header_freq = 1;
|
|
else
|
|
/* every 2 seconds */
|
|
s->pack_header_freq = 2 * bitrate / s->packet_size / 8;
|
|
|
|
/* the above seems to make pack_header_freq zero sometimes */
|
|
if (s->pack_header_freq == 0)
|
|
s->pack_header_freq = 1;
|
|
|
|
if (s->is_mpeg2)
|
|
/* every 200 packets. Need to look at the spec. */
|
|
s->system_header_freq = s->pack_header_freq * 40;
|
|
else if (s->is_vcd)
|
|
/* the standard mandates that there are only two system headers
|
|
in the whole file: one in the first packet of each stream.
|
|
(see standard p. IV-7 and IV-8) */
|
|
s->system_header_freq = 0x7fffffff;
|
|
else
|
|
s->system_header_freq = s->pack_header_freq * 5;
|
|
|
|
for(i=0;i<ctx->nb_streams;i++) {
|
|
stream = ctx->streams[i]->priv_data;
|
|
stream->packet_number = 0;
|
|
}
|
|
s->system_header_size = get_system_header_size(ctx);
|
|
s->last_scr = 0;
|
|
return 0;
|
|
fail:
|
|
for(i=0;i<ctx->nb_streams;i++) {
|
|
av_free(ctx->streams[i]->priv_data);
|
|
}
|
|
return -ENOMEM;
|
|
}
|
|
|
|
static inline void put_timestamp(ByteIOContext *pb, int id, int64_t timestamp)
|
|
{
|
|
put_byte(pb,
|
|
(id << 4) |
|
|
(((timestamp >> 30) & 0x07) << 1) |
|
|
1);
|
|
put_be16(pb, (uint16_t)((((timestamp >> 15) & 0x7fff) << 1) | 1));
|
|
put_be16(pb, (uint16_t)((((timestamp) & 0x7fff) << 1) | 1));
|
|
}
|
|
|
|
|
|
/* return the number of padding bytes that should be inserted into
|
|
the multiplexed stream.*/
|
|
static int get_vcd_padding_size(AVFormatContext *ctx, int64_t pts)
|
|
{
|
|
MpegMuxContext *s = ctx->priv_data;
|
|
int pad_bytes = 0;
|
|
|
|
if (s->vcd_padding_bitrate > 0 && pts!=AV_NOPTS_VALUE)
|
|
{
|
|
int64_t full_pad_bytes;
|
|
|
|
full_pad_bytes = (int64_t)((s->vcd_padding_bitrate * (pts / 90000.0)) / 8.0); //FIXME this is wrong
|
|
pad_bytes = (int) (full_pad_bytes - s->vcd_padding_bytes_written);
|
|
|
|
if (pad_bytes<0)
|
|
/* might happen if we have already padded to a later timestamp. This
|
|
can occur if another stream has already advanced further.*/
|
|
pad_bytes=0;
|
|
}
|
|
|
|
return pad_bytes;
|
|
}
|
|
|
|
|
|
#if 0 /* unused, remove? */
|
|
/* return the exact available payload size for the next packet for
|
|
stream 'stream_index'. 'pts' and 'dts' are only used to know if
|
|
timestamps are needed in the packet header. */
|
|
static int get_packet_payload_size(AVFormatContext *ctx, int stream_index,
|
|
int64_t pts, int64_t dts)
|
|
{
|
|
MpegMuxContext *s = ctx->priv_data;
|
|
int buf_index;
|
|
StreamInfo *stream;
|
|
|
|
stream = ctx->streams[stream_index]->priv_data;
|
|
|
|
buf_index = 0;
|
|
if (((s->packet_number % s->pack_header_freq) == 0)) {
|
|
/* pack header size */
|
|
if (s->is_mpeg2)
|
|
buf_index += 14;
|
|
else
|
|
buf_index += 12;
|
|
|
|
if (s->is_vcd) {
|
|
/* there is exactly one system header for each stream in a VCD MPEG,
|
|
One in the very first video packet and one in the very first
|
|
audio packet (see VCD standard p. IV-7 and IV-8).*/
|
|
|
|
if (stream->packet_number==0)
|
|
/* The system headers refer only to the stream they occur in,
|
|
so they have a constant size.*/
|
|
buf_index += 15;
|
|
|
|
} else {
|
|
if ((s->packet_number % s->system_header_freq) == 0)
|
|
buf_index += s->system_header_size;
|
|
}
|
|
}
|
|
|
|
if ((s->is_vcd && stream->packet_number==0)
|
|
|| (s->is_svcd && s->packet_number==0))
|
|
/* the first pack of each stream contains only the pack header,
|
|
the system header and some padding (see VCD standard p. IV-6)
|
|
Add the padding size, so that the actual payload becomes 0.*/
|
|
buf_index += s->packet_size - buf_index;
|
|
else {
|
|
/* packet header size */
|
|
buf_index += 6;
|
|
if (s->is_mpeg2) {
|
|
buf_index += 3;
|
|
if (stream->packet_number==0)
|
|
buf_index += 3; /* PES extension */
|
|
buf_index += 1; /* obligatory stuffing byte */
|
|
}
|
|
if (pts != AV_NOPTS_VALUE) {
|
|
if (dts != pts)
|
|
buf_index += 5 + 5;
|
|
else
|
|
buf_index += 5;
|
|
|
|
} else {
|
|
if (!s->is_mpeg2)
|
|
buf_index++;
|
|
}
|
|
|
|
if (stream->id < 0xc0) {
|
|
/* AC3/LPCM private data header */
|
|
buf_index += 4;
|
|
if (stream->id >= 0xa0) {
|
|
int n;
|
|
buf_index += 3;
|
|
/* NOTE: we round the payload size to an integer number of
|
|
LPCM samples */
|
|
n = (s->packet_size - buf_index) % stream->lpcm_align;
|
|
if (n)
|
|
buf_index += (stream->lpcm_align - n);
|
|
}
|
|
}
|
|
|
|
if (s->is_vcd && stream->id == AUDIO_ID)
|
|
/* The VCD standard demands that 20 zero bytes follow
|
|
each audio packet (see standard p. IV-8).*/
|
|
buf_index+=20;
|
|
}
|
|
return s->packet_size - buf_index;
|
|
}
|
|
#endif
|
|
|
|
/* Write an MPEG padding packet header. */
|
|
static void put_padding_packet(AVFormatContext *ctx, ByteIOContext *pb,int packet_bytes)
|
|
{
|
|
MpegMuxContext *s = ctx->priv_data;
|
|
int i;
|
|
|
|
put_be32(pb, PADDING_STREAM);
|
|
put_be16(pb, packet_bytes - 6);
|
|
if (!s->is_mpeg2) {
|
|
put_byte(pb, 0x0f);
|
|
packet_bytes -= 7;
|
|
} else
|
|
packet_bytes -= 6;
|
|
|
|
for(i=0;i<packet_bytes;i++)
|
|
put_byte(pb, 0xff);
|
|
}
|
|
|
|
static int get_nb_frames(AVFormatContext *ctx, StreamInfo *stream, int len){
|
|
int nb_frames=0;
|
|
PacketDesc *pkt_desc= stream->premux_packet;
|
|
|
|
while(len>0){
|
|
if(pkt_desc->size == pkt_desc->unwritten_size)
|
|
nb_frames++;
|
|
len -= pkt_desc->unwritten_size;
|
|
pkt_desc= pkt_desc->next;
|
|
}
|
|
|
|
return nb_frames;
|
|
}
|
|
|
|
/* flush the packet on stream stream_index */
|
|
static int flush_packet(AVFormatContext *ctx, int stream_index,
|
|
int64_t pts, int64_t dts, int64_t scr, int trailer_size)
|
|
{
|
|
MpegMuxContext *s = ctx->priv_data;
|
|
StreamInfo *stream = ctx->streams[stream_index]->priv_data;
|
|
uint8_t *buf_ptr;
|
|
int size, payload_size, startcode, id, stuffing_size, i, header_len;
|
|
int packet_size;
|
|
uint8_t buffer[128];
|
|
int zero_trail_bytes = 0;
|
|
int pad_packet_bytes = 0;
|
|
int pes_flags;
|
|
int general_pack = 0; /*"general" pack without data specific to one stream?*/
|
|
int nb_frames;
|
|
|
|
id = stream->id;
|
|
|
|
#if 0
|
|
printf("packet ID=%2x PTS=%0.3f\n",
|
|
id, pts / 90000.0);
|
|
#endif
|
|
|
|
buf_ptr = buffer;
|
|
|
|
if ((s->packet_number % s->pack_header_freq) == 0 || s->last_scr != scr) {
|
|
/* output pack and systems header if needed */
|
|
size = put_pack_header(ctx, buf_ptr, scr);
|
|
buf_ptr += size;
|
|
s->last_scr= scr;
|
|
|
|
if (s->is_vcd) {
|
|
/* there is exactly one system header for each stream in a VCD MPEG,
|
|
One in the very first video packet and one in the very first
|
|
audio packet (see VCD standard p. IV-7 and IV-8).*/
|
|
|
|
if (stream->packet_number==0) {
|
|
size = put_system_header(ctx, buf_ptr, id);
|
|
buf_ptr += size;
|
|
}
|
|
} else if (s->is_dvd) {
|
|
if (stream->align_iframe || s->packet_number == 0){
|
|
int bytes_to_iframe;
|
|
int PES_bytes_to_fill;
|
|
if (stream->fifo_iframe_ptr >= stream->fifo.rptr) {
|
|
bytes_to_iframe = stream->fifo_iframe_ptr - stream->fifo.rptr;
|
|
} else {
|
|
bytes_to_iframe = (stream->fifo.end - stream->fifo.rptr) + (stream->fifo_iframe_ptr - stream->fifo.buffer);
|
|
}
|
|
PES_bytes_to_fill = s->packet_size - size - 10;
|
|
|
|
if (pts != AV_NOPTS_VALUE) {
|
|
if (dts != pts)
|
|
PES_bytes_to_fill -= 5 + 5;
|
|
else
|
|
PES_bytes_to_fill -= 5;
|
|
}
|
|
|
|
if (bytes_to_iframe == 0 || s->packet_number == 0) {
|
|
size = put_system_header(ctx, buf_ptr, 0);
|
|
buf_ptr += size;
|
|
size = buf_ptr - buffer;
|
|
put_buffer(&ctx->pb, buffer, size);
|
|
|
|
put_be32(&ctx->pb, PRIVATE_STREAM_2);
|
|
put_be16(&ctx->pb, 0x03d4); // length
|
|
put_byte(&ctx->pb, 0x00); // substream ID, 00=PCI
|
|
for (i = 0; i < 979; i++)
|
|
put_byte(&ctx->pb, 0x00);
|
|
|
|
put_be32(&ctx->pb, PRIVATE_STREAM_2);
|
|
put_be16(&ctx->pb, 0x03fa); // length
|
|
put_byte(&ctx->pb, 0x01); // substream ID, 01=DSI
|
|
for (i = 0; i < 1017; i++)
|
|
put_byte(&ctx->pb, 0x00);
|
|
|
|
memset(buffer, 0, 128);
|
|
buf_ptr = buffer;
|
|
s->packet_number++;
|
|
stream->align_iframe = 0;
|
|
scr += s->packet_size*90000LL / (s->mux_rate*50LL); //FIXME rounding and first few bytes of each packet
|
|
size = put_pack_header(ctx, buf_ptr, scr);
|
|
s->last_scr= scr;
|
|
buf_ptr += size;
|
|
/* GOP Start */
|
|
} else if (bytes_to_iframe < PES_bytes_to_fill) {
|
|
pad_packet_bytes = PES_bytes_to_fill - bytes_to_iframe;
|
|
}
|
|
}
|
|
} else {
|
|
if ((s->packet_number % s->system_header_freq) == 0) {
|
|
size = put_system_header(ctx, buf_ptr, 0);
|
|
buf_ptr += size;
|
|
}
|
|
}
|
|
}
|
|
size = buf_ptr - buffer;
|
|
put_buffer(&ctx->pb, buffer, size);
|
|
|
|
packet_size = s->packet_size - size;
|
|
|
|
if (s->is_vcd && id == AUDIO_ID)
|
|
/* The VCD standard demands that 20 zero bytes follow
|
|
each audio pack (see standard p. IV-8).*/
|
|
zero_trail_bytes += 20;
|
|
|
|
if ((s->is_vcd && stream->packet_number==0)
|
|
|| (s->is_svcd && s->packet_number==0)) {
|
|
/* for VCD the first pack of each stream contains only the pack header,
|
|
the system header and lots of padding (see VCD standard p. IV-6).
|
|
In the case of an audio pack, 20 zero bytes are also added at
|
|
the end.*/
|
|
/* For SVCD we fill the very first pack to increase compatibility with
|
|
some DVD players. Not mandated by the standard.*/
|
|
if (s->is_svcd)
|
|
general_pack = 1; /* the system header refers to both streams and no stream data*/
|
|
pad_packet_bytes = packet_size - zero_trail_bytes;
|
|
}
|
|
|
|
packet_size -= pad_packet_bytes + zero_trail_bytes;
|
|
|
|
if (packet_size > 0) {
|
|
|
|
/* packet header size */
|
|
packet_size -= 6;
|
|
|
|
/* packet header */
|
|
if (s->is_mpeg2) {
|
|
header_len = 3;
|
|
if (stream->packet_number==0)
|
|
header_len += 3; /* PES extension */
|
|
header_len += 1; /* obligatory stuffing byte */
|
|
} else {
|
|
header_len = 0;
|
|
}
|
|
if (pts != AV_NOPTS_VALUE) {
|
|
if (dts != pts)
|
|
header_len += 5 + 5;
|
|
else
|
|
header_len += 5;
|
|
} else {
|
|
if (!s->is_mpeg2)
|
|
header_len++;
|
|
}
|
|
|
|
payload_size = packet_size - header_len;
|
|
if (id < 0xc0) {
|
|
startcode = PRIVATE_STREAM_1;
|
|
payload_size -= 1;
|
|
if (id >= 0x40) {
|
|
payload_size -= 3;
|
|
if (id >= 0xa0)
|
|
payload_size -= 3;
|
|
}
|
|
} else {
|
|
startcode = 0x100 + id;
|
|
}
|
|
|
|
stuffing_size = payload_size - fifo_size(&stream->fifo, stream->fifo.rptr);
|
|
|
|
// first byte doesnt fit -> reset pts/dts + stuffing
|
|
if(payload_size <= trailer_size && pts != AV_NOPTS_VALUE){
|
|
int timestamp_len=0;
|
|
if(dts != pts)
|
|
timestamp_len += 5;
|
|
if(pts != AV_NOPTS_VALUE)
|
|
timestamp_len += s->is_mpeg2 ? 5 : 4;
|
|
pts=dts= AV_NOPTS_VALUE;
|
|
header_len -= timestamp_len;
|
|
if (s->is_dvd && stream->align_iframe) {
|
|
pad_packet_bytes += timestamp_len;
|
|
packet_size -= timestamp_len;
|
|
} else {
|
|
payload_size += timestamp_len;
|
|
}
|
|
stuffing_size += timestamp_len;
|
|
if(payload_size > trailer_size)
|
|
stuffing_size += payload_size - trailer_size;
|
|
}
|
|
|
|
if (pad_packet_bytes > 0 && pad_packet_bytes <= 7) { // can't use padding, so use stuffing
|
|
packet_size += pad_packet_bytes;
|
|
payload_size += pad_packet_bytes; // undo the previous adjustment
|
|
if (stuffing_size < 0) {
|
|
stuffing_size = pad_packet_bytes;
|
|
} else {
|
|
stuffing_size += pad_packet_bytes;
|
|
}
|
|
pad_packet_bytes = 0;
|
|
}
|
|
|
|
if (stuffing_size < 0)
|
|
stuffing_size = 0;
|
|
if (stuffing_size > 16) { /*<=16 for MPEG-1, <=32 for MPEG-2*/
|
|
pad_packet_bytes += stuffing_size;
|
|
packet_size -= stuffing_size;
|
|
payload_size -= stuffing_size;
|
|
stuffing_size = 0;
|
|
}
|
|
|
|
nb_frames= get_nb_frames(ctx, stream, payload_size - stuffing_size);
|
|
|
|
put_be32(&ctx->pb, startcode);
|
|
|
|
put_be16(&ctx->pb, packet_size);
|
|
|
|
if (!s->is_mpeg2)
|
|
for(i=0;i<stuffing_size;i++)
|
|
put_byte(&ctx->pb, 0xff);
|
|
|
|
if (s->is_mpeg2) {
|
|
put_byte(&ctx->pb, 0x80); /* mpeg2 id */
|
|
|
|
pes_flags=0;
|
|
|
|
if (pts != AV_NOPTS_VALUE) {
|
|
pes_flags |= 0x80;
|
|
if (dts != pts)
|
|
pes_flags |= 0x40;
|
|
}
|
|
|
|
/* Both the MPEG-2 and the SVCD standards demand that the
|
|
P-STD_buffer_size field be included in the first packet of
|
|
every stream. (see SVCD standard p. 26 V.2.3.1 and V.2.3.2
|
|
and MPEG-2 standard 2.7.7) */
|
|
if (stream->packet_number == 0)
|
|
pes_flags |= 0x01;
|
|
|
|
put_byte(&ctx->pb, pes_flags); /* flags */
|
|
put_byte(&ctx->pb, header_len - 3 + stuffing_size);
|
|
|
|
if (pes_flags & 0x80) /*write pts*/
|
|
put_timestamp(&ctx->pb, (pes_flags & 0x40) ? 0x03 : 0x02, pts);
|
|
if (pes_flags & 0x40) /*write dts*/
|
|
put_timestamp(&ctx->pb, 0x01, dts);
|
|
|
|
if (pes_flags & 0x01) { /*write pes extension*/
|
|
put_byte(&ctx->pb, 0x10); /* flags */
|
|
|
|
/* P-STD buffer info */
|
|
if (id == AUDIO_ID)
|
|
put_be16(&ctx->pb, 0x4000 | stream->max_buffer_size/128);
|
|
else
|
|
put_be16(&ctx->pb, 0x6000 | stream->max_buffer_size/1024);
|
|
}
|
|
|
|
} else {
|
|
if (pts != AV_NOPTS_VALUE) {
|
|
if (dts != pts) {
|
|
put_timestamp(&ctx->pb, 0x03, pts);
|
|
put_timestamp(&ctx->pb, 0x01, dts);
|
|
} else {
|
|
put_timestamp(&ctx->pb, 0x02, pts);
|
|
}
|
|
} else {
|
|
put_byte(&ctx->pb, 0x0f);
|
|
}
|
|
}
|
|
|
|
if (s->is_mpeg2) {
|
|
/* special stuffing byte that is always written
|
|
to prevent accidental generation of start codes. */
|
|
put_byte(&ctx->pb, 0xff);
|
|
|
|
for(i=0;i<stuffing_size;i++)
|
|
put_byte(&ctx->pb, 0xff);
|
|
}
|
|
|
|
if (startcode == PRIVATE_STREAM_1) {
|
|
put_byte(&ctx->pb, id);
|
|
if (id >= 0xa0) {
|
|
/* LPCM (XXX: check nb_frames) */
|
|
put_byte(&ctx->pb, 7);
|
|
put_be16(&ctx->pb, 4); /* skip 3 header bytes */
|
|
put_byte(&ctx->pb, stream->lpcm_header[0]);
|
|
put_byte(&ctx->pb, stream->lpcm_header[1]);
|
|
put_byte(&ctx->pb, stream->lpcm_header[2]);
|
|
} else if (id >= 0x40) {
|
|
/* AC3 */
|
|
put_byte(&ctx->pb, nb_frames);
|
|
put_be16(&ctx->pb, trailer_size+1);
|
|
}
|
|
}
|
|
|
|
/* output data */
|
|
if(put_fifo(&ctx->pb, &stream->fifo, payload_size - stuffing_size, &stream->fifo.rptr) < 0)
|
|
return -1;
|
|
}else{
|
|
payload_size=
|
|
stuffing_size= 0;
|
|
}
|
|
|
|
if (pad_packet_bytes > 0)
|
|
put_padding_packet(ctx,&ctx->pb, pad_packet_bytes);
|
|
|
|
for(i=0;i<zero_trail_bytes;i++)
|
|
put_byte(&ctx->pb, 0x00);
|
|
|
|
put_flush_packet(&ctx->pb);
|
|
|
|
s->packet_number++;
|
|
|
|
/* only increase the stream packet number if this pack actually contains
|
|
something that is specific to this stream! I.e. a dedicated header
|
|
or some data.*/
|
|
if (!general_pack)
|
|
stream->packet_number++;
|
|
|
|
return payload_size - stuffing_size;
|
|
}
|
|
|
|
static void put_vcd_padding_sector(AVFormatContext *ctx)
|
|
{
|
|
/* There are two ways to do this padding: writing a sector/pack
|
|
of 0 values, or writing an MPEG padding pack. Both seem to
|
|
work with most decoders, BUT the VCD standard only allows a 0-sector
|
|
(see standard p. IV-4, IV-5).
|
|
So a 0-sector it is...*/
|
|
|
|
MpegMuxContext *s = ctx->priv_data;
|
|
int i;
|
|
|
|
for(i=0;i<s->packet_size;i++)
|
|
put_byte(&ctx->pb, 0);
|
|
|
|
s->vcd_padding_bytes_written += s->packet_size;
|
|
|
|
put_flush_packet(&ctx->pb);
|
|
|
|
/* increasing the packet number is correct. The SCR of the following packs
|
|
is calculated from the packet_number and it has to include the padding
|
|
sector (it represents the sector index, not the MPEG pack index)
|
|
(see VCD standard p. IV-6)*/
|
|
s->packet_number++;
|
|
}
|
|
|
|
#if 0 /* unused, remove? */
|
|
static int64_t get_vcd_scr(AVFormatContext *ctx,int stream_index,int64_t pts)
|
|
{
|
|
MpegMuxContext *s = ctx->priv_data;
|
|
int64_t scr;
|
|
|
|
/* Since the data delivery rate is constant, SCR is computed
|
|
using the formula C + i * 1200 where C is the start constant
|
|
and i is the pack index.
|
|
It is recommended that SCR 0 is at the beginning of the VCD front
|
|
margin (a sequence of empty Form 2 sectors on the CD).
|
|
It is recommended that the front margin is 30 sectors long, so
|
|
we use C = 30*1200 = 36000
|
|
(Note that even if the front margin is not 30 sectors the file
|
|
will still be correct according to the standard. It just won't have
|
|
the "recommended" value).*/
|
|
scr = 36000 + s->packet_number * 1200;
|
|
|
|
return scr;
|
|
}
|
|
#endif
|
|
|
|
static int remove_decoded_packets(AVFormatContext *ctx, int64_t scr){
|
|
// MpegMuxContext *s = ctx->priv_data;
|
|
int i;
|
|
|
|
for(i=0; i<ctx->nb_streams; i++){
|
|
AVStream *st = ctx->streams[i];
|
|
StreamInfo *stream = st->priv_data;
|
|
PacketDesc *pkt_desc= stream->predecode_packet;
|
|
|
|
while(pkt_desc && scr > pkt_desc->dts){ //FIXME > vs >=
|
|
if(stream->buffer_index < pkt_desc->size ||
|
|
stream->predecode_packet == stream->premux_packet){
|
|
av_log(ctx, AV_LOG_ERROR, "buffer underflow\n");
|
|
break;
|
|
}
|
|
stream->buffer_index -= pkt_desc->size;
|
|
|
|
stream->predecode_packet= pkt_desc->next;
|
|
av_freep(&pkt_desc);
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int output_packet(AVFormatContext *ctx, int flush){
|
|
MpegMuxContext *s = ctx->priv_data;
|
|
AVStream *st;
|
|
StreamInfo *stream;
|
|
int i, avail_space, es_size, trailer_size;
|
|
int best_i= -1;
|
|
int best_score= INT_MIN;
|
|
int ignore_constraints=0;
|
|
int64_t scr= s->last_scr;
|
|
PacketDesc *timestamp_packet;
|
|
const int64_t max_delay= av_rescale(ctx->max_delay, 90000, AV_TIME_BASE);
|
|
|
|
retry:
|
|
for(i=0; i<ctx->nb_streams; i++){
|
|
AVStream *st = ctx->streams[i];
|
|
StreamInfo *stream = st->priv_data;
|
|
const int avail_data= fifo_size(&stream->fifo, stream->fifo.rptr);
|
|
const int space= stream->max_buffer_size - stream->buffer_index;
|
|
int rel_space= 1024*space / stream->max_buffer_size;
|
|
PacketDesc *next_pkt= stream->premux_packet;
|
|
|
|
/* for subtitle, a single PES packet must be generated,
|
|
so we flush after every single subtitle packet */
|
|
if(s->packet_size > avail_data && !flush
|
|
&& st->codec->codec_type != CODEC_TYPE_SUBTITLE)
|
|
return 0;
|
|
if(avail_data==0)
|
|
continue;
|
|
assert(avail_data>0);
|
|
|
|
if(space < s->packet_size && !ignore_constraints)
|
|
continue;
|
|
|
|
if(next_pkt && next_pkt->dts - scr > max_delay)
|
|
continue;
|
|
|
|
if(rel_space > best_score){
|
|
best_score= rel_space;
|
|
best_i = i;
|
|
avail_space= space;
|
|
}
|
|
}
|
|
|
|
if(best_i < 0){
|
|
int64_t best_dts= INT64_MAX;
|
|
|
|
for(i=0; i<ctx->nb_streams; i++){
|
|
AVStream *st = ctx->streams[i];
|
|
StreamInfo *stream = st->priv_data;
|
|
PacketDesc *pkt_desc= stream->predecode_packet;
|
|
if(pkt_desc && pkt_desc->dts < best_dts)
|
|
best_dts= pkt_desc->dts;
|
|
}
|
|
|
|
#if 0
|
|
av_log(ctx, AV_LOG_DEBUG, "bumping scr, scr:%f, dts:%f\n",
|
|
scr/90000.0, best_dts/90000.0);
|
|
#endif
|
|
if(best_dts == INT64_MAX)
|
|
return 0;
|
|
|
|
if(scr >= best_dts+1 && !ignore_constraints){
|
|
av_log(ctx, AV_LOG_ERROR, "packet too large, ignoring buffer limits to mux it\n");
|
|
ignore_constraints= 1;
|
|
}
|
|
scr= FFMAX(best_dts+1, scr);
|
|
if(remove_decoded_packets(ctx, scr) < 0)
|
|
return -1;
|
|
goto retry;
|
|
}
|
|
|
|
assert(best_i >= 0);
|
|
|
|
st = ctx->streams[best_i];
|
|
stream = st->priv_data;
|
|
|
|
assert(fifo_size(&stream->fifo, stream->fifo.rptr) > 0);
|
|
|
|
assert(avail_space >= s->packet_size || ignore_constraints);
|
|
|
|
timestamp_packet= stream->premux_packet;
|
|
if(timestamp_packet->unwritten_size == timestamp_packet->size){
|
|
trailer_size= 0;
|
|
}else{
|
|
trailer_size= timestamp_packet->unwritten_size;
|
|
timestamp_packet= timestamp_packet->next;
|
|
}
|
|
|
|
if(timestamp_packet){
|
|
//av_log(ctx, AV_LOG_DEBUG, "dts:%f pts:%f scr:%f stream:%d\n", timestamp_packet->dts/90000.0, timestamp_packet->pts/90000.0, scr/90000.0, best_i);
|
|
es_size= flush_packet(ctx, best_i, timestamp_packet->pts, timestamp_packet->dts, scr, trailer_size);
|
|
}else{
|
|
assert(fifo_size(&stream->fifo, stream->fifo.rptr) == trailer_size);
|
|
es_size= flush_packet(ctx, best_i, AV_NOPTS_VALUE, AV_NOPTS_VALUE, scr, trailer_size);
|
|
}
|
|
|
|
if (s->is_vcd) {
|
|
/* Write one or more padding sectors, if necessary, to reach
|
|
the constant overall bitrate.*/
|
|
int vcd_pad_bytes;
|
|
|
|
while((vcd_pad_bytes = get_vcd_padding_size(ctx,stream->premux_packet->pts) ) >= s->packet_size){ //FIXME pts cannot be correct here
|
|
put_vcd_padding_sector(ctx);
|
|
s->last_scr += s->packet_size*90000LL / (s->mux_rate*50LL); //FIXME rounding and first few bytes of each packet
|
|
}
|
|
}
|
|
|
|
stream->buffer_index += es_size;
|
|
s->last_scr += s->packet_size*90000LL / (s->mux_rate*50LL); //FIXME rounding and first few bytes of each packet
|
|
|
|
while(stream->premux_packet && stream->premux_packet->unwritten_size <= es_size){
|
|
es_size -= stream->premux_packet->unwritten_size;
|
|
stream->premux_packet= stream->premux_packet->next;
|
|
}
|
|
if(es_size)
|
|
stream->premux_packet->unwritten_size -= es_size;
|
|
|
|
if(remove_decoded_packets(ctx, s->last_scr) < 0)
|
|
return -1;
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int mpeg_mux_write_packet(AVFormatContext *ctx, AVPacket *pkt)
|
|
{
|
|
MpegMuxContext *s = ctx->priv_data;
|
|
int stream_index= pkt->stream_index;
|
|
int size= pkt->size;
|
|
uint8_t *buf= pkt->data;
|
|
AVStream *st = ctx->streams[stream_index];
|
|
StreamInfo *stream = st->priv_data;
|
|
int64_t pts, dts;
|
|
PacketDesc *pkt_desc;
|
|
const int preload= av_rescale(ctx->preload, 90000, AV_TIME_BASE);
|
|
const int is_iframe = st->codec->codec_type == CODEC_TYPE_VIDEO && (pkt->flags & PKT_FLAG_KEY);
|
|
|
|
pts= pkt->pts;
|
|
dts= pkt->dts;
|
|
|
|
if(pts != AV_NOPTS_VALUE) pts += preload;
|
|
if(dts != AV_NOPTS_VALUE) dts += preload;
|
|
|
|
//av_log(ctx, AV_LOG_DEBUG, "dts:%f pts:%f flags:%d stream:%d nopts:%d\n", dts/90000.0, pts/90000.0, pkt->flags, pkt->stream_index, pts != AV_NOPTS_VALUE);
|
|
if (!stream->premux_packet)
|
|
stream->next_packet = &stream->premux_packet;
|
|
*stream->next_packet=
|
|
pkt_desc= av_mallocz(sizeof(PacketDesc));
|
|
pkt_desc->pts= pts;
|
|
pkt_desc->dts= dts;
|
|
pkt_desc->unwritten_size=
|
|
pkt_desc->size= size;
|
|
if(!stream->predecode_packet)
|
|
stream->predecode_packet= pkt_desc;
|
|
stream->next_packet= &pkt_desc->next;
|
|
|
|
fifo_realloc(&stream->fifo, fifo_size(&stream->fifo, NULL) + size + 1);
|
|
|
|
if (s->is_dvd){
|
|
if (is_iframe && (s->packet_number == 0 || (pts - stream->vobu_start_pts >= 36000))) { // min VOBU length 0.4 seconds (mpucoder)
|
|
stream->fifo_iframe_ptr = stream->fifo.wptr;
|
|
stream->align_iframe = 1;
|
|
stream->vobu_start_pts = pts;
|
|
} else {
|
|
stream->align_iframe = 0;
|
|
}
|
|
}
|
|
|
|
fifo_write(&stream->fifo, buf, size, &stream->fifo.wptr);
|
|
|
|
for(;;){
|
|
int ret= output_packet(ctx, 0);
|
|
if(ret<=0)
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
static int mpeg_mux_end(AVFormatContext *ctx)
|
|
{
|
|
// MpegMuxContext *s = ctx->priv_data;
|
|
StreamInfo *stream;
|
|
int i;
|
|
|
|
for(;;){
|
|
int ret= output_packet(ctx, 1);
|
|
if(ret<0)
|
|
return ret;
|
|
else if(ret==0)
|
|
break;
|
|
}
|
|
|
|
/* End header according to MPEG1 systems standard. We do not write
|
|
it as it is usually not needed by decoders and because it
|
|
complicates MPEG stream concatenation. */
|
|
//put_be32(&ctx->pb, ISO_11172_END_CODE);
|
|
//put_flush_packet(&ctx->pb);
|
|
|
|
for(i=0;i<ctx->nb_streams;i++) {
|
|
stream = ctx->streams[i]->priv_data;
|
|
|
|
assert(fifo_size(&stream->fifo, stream->fifo.rptr) == 0);
|
|
fifo_free(&stream->fifo);
|
|
}
|
|
return 0;
|
|
}
|
|
#endif //CONFIG_MUXERS
|
|
|
|
/*********************************************/
|
|
/* demux code */
|
|
|
|
#define MAX_SYNC_SIZE 100000
|
|
|
|
static int mpegps_probe(AVProbeData *p)
|
|
{
|
|
uint32_t code= -1;
|
|
int sys=0, pspack=0, priv1=0, vid=0;
|
|
int i;
|
|
|
|
for(i=0; i<p->buf_size; i++){
|
|
code = (code<<8) + p->buf[i];
|
|
if ((code & 0xffffff00) == 0x100) {
|
|
switch(code){
|
|
case SYSTEM_HEADER_START_CODE: sys++; break;
|
|
case PRIVATE_STREAM_1: priv1++; break;
|
|
case PACK_START_CODE: pspack++; break;
|
|
case (VIDEO_ID + 0x100): vid++; break;
|
|
}
|
|
}
|
|
}
|
|
if(sys && sys*9 <= pspack*10)
|
|
return AVPROBE_SCORE_MAX/2+2; // +1 for .mpg
|
|
if((priv1 || vid) && (priv1+vid)*9 <= pspack*10)
|
|
return AVPROBE_SCORE_MAX/2+2; // +1 for .mpg
|
|
return 0;
|
|
}
|
|
|
|
|
|
typedef struct MpegDemuxContext {
|
|
int header_state;
|
|
unsigned char psm_es_type[256];
|
|
} MpegDemuxContext;
|
|
|
|
static int mpegps_read_header(AVFormatContext *s,
|
|
AVFormatParameters *ap)
|
|
{
|
|
MpegDemuxContext *m = s->priv_data;
|
|
m->header_state = 0xff;
|
|
s->ctx_flags |= AVFMTCTX_NOHEADER;
|
|
|
|
/* no need to do more */
|
|
return 0;
|
|
}
|
|
|
|
static int64_t get_pts(ByteIOContext *pb, int c)
|
|
{
|
|
int64_t pts;
|
|
int val;
|
|
|
|
if (c < 0)
|
|
c = get_byte(pb);
|
|
pts = (int64_t)((c >> 1) & 0x07) << 30;
|
|
val = get_be16(pb);
|
|
pts |= (int64_t)(val >> 1) << 15;
|
|
val = get_be16(pb);
|
|
pts |= (int64_t)(val >> 1);
|
|
return pts;
|
|
}
|
|
|
|
static int find_next_start_code(ByteIOContext *pb, int *size_ptr,
|
|
uint32_t *header_state)
|
|
{
|
|
unsigned int state, v;
|
|
int val, n;
|
|
|
|
state = *header_state;
|
|
n = *size_ptr;
|
|
while (n > 0) {
|
|
if (url_feof(pb))
|
|
break;
|
|
v = get_byte(pb);
|
|
n--;
|
|
if (state == 0x000001) {
|
|
state = ((state << 8) | v) & 0xffffff;
|
|
val = state;
|
|
goto found;
|
|
}
|
|
state = ((state << 8) | v) & 0xffffff;
|
|
}
|
|
val = -1;
|
|
found:
|
|
*header_state = state;
|
|
*size_ptr = n;
|
|
return val;
|
|
}
|
|
|
|
#if 0 /* unused, remove? */
|
|
/* XXX: optimize */
|
|
static int find_prev_start_code(ByteIOContext *pb, int *size_ptr)
|
|
{
|
|
int64_t pos, pos_start;
|
|
int max_size, start_code;
|
|
|
|
max_size = *size_ptr;
|
|
pos_start = url_ftell(pb);
|
|
|
|
/* in order to go faster, we fill the buffer */
|
|
pos = pos_start - 16386;
|
|
if (pos < 0)
|
|
pos = 0;
|
|
url_fseek(pb, pos, SEEK_SET);
|
|
get_byte(pb);
|
|
|
|
pos = pos_start;
|
|
for(;;) {
|
|
pos--;
|
|
if (pos < 0 || (pos_start - pos) >= max_size) {
|
|
start_code = -1;
|
|
goto the_end;
|
|
}
|
|
url_fseek(pb, pos, SEEK_SET);
|
|
start_code = get_be32(pb);
|
|
if ((start_code & 0xffffff00) == 0x100)
|
|
break;
|
|
}
|
|
the_end:
|
|
*size_ptr = pos_start - pos;
|
|
return start_code;
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* Extracts stream types from a program stream map
|
|
* According to ISO/IEC 13818-1 ('MPEG-2 Systems') table 2-35
|
|
*
|
|
* @return number of bytes occupied by PSM in the bitstream
|
|
*/
|
|
static long mpegps_psm_parse(MpegDemuxContext *m, ByteIOContext *pb)
|
|
{
|
|
int psm_length, ps_info_length, es_map_length;
|
|
|
|
psm_length = get_be16(pb);
|
|
get_byte(pb);
|
|
get_byte(pb);
|
|
ps_info_length = get_be16(pb);
|
|
|
|
/* skip program_stream_info */
|
|
url_fskip(pb, ps_info_length);
|
|
es_map_length = get_be16(pb);
|
|
|
|
/* at least one es available? */
|
|
while (es_map_length >= 4){
|
|
unsigned char type = get_byte(pb);
|
|
unsigned char es_id = get_byte(pb);
|
|
uint16_t es_info_length = get_be16(pb);
|
|
/* remember mapping from stream id to stream type */
|
|
m->psm_es_type[es_id] = type;
|
|
/* skip program_stream_info */
|
|
url_fskip(pb, es_info_length);
|
|
es_map_length -= 4 + es_info_length;
|
|
}
|
|
get_be32(pb); /* crc32 */
|
|
return 2 + psm_length;
|
|
}
|
|
|
|
/* read the next PES header. Return its position in ppos
|
|
(if not NULL), and its start code, pts and dts.
|
|
*/
|
|
static int mpegps_read_pes_header(AVFormatContext *s,
|
|
int64_t *ppos, int *pstart_code,
|
|
int64_t *ppts, int64_t *pdts)
|
|
{
|
|
MpegDemuxContext *m = s->priv_data;
|
|
int len, size, startcode, c, flags, header_len;
|
|
int64_t pts, dts, last_pos;
|
|
|
|
last_pos = -1;
|
|
redo:
|
|
/* next start code (should be immediately after) */
|
|
m->header_state = 0xff;
|
|
size = MAX_SYNC_SIZE;
|
|
startcode = find_next_start_code(&s->pb, &size, &m->header_state);
|
|
//printf("startcode=%x pos=0x%Lx\n", startcode, url_ftell(&s->pb));
|
|
if (startcode < 0)
|
|
return AVERROR_IO;
|
|
if (startcode == PACK_START_CODE)
|
|
goto redo;
|
|
if (startcode == SYSTEM_HEADER_START_CODE)
|
|
goto redo;
|
|
if (startcode == PADDING_STREAM ||
|
|
startcode == PRIVATE_STREAM_2) {
|
|
/* skip them */
|
|
len = get_be16(&s->pb);
|
|
url_fskip(&s->pb, len);
|
|
goto redo;
|
|
}
|
|
if (startcode == PROGRAM_STREAM_MAP) {
|
|
mpegps_psm_parse(m, &s->pb);
|
|
goto redo;
|
|
}
|
|
|
|
/* find matching stream */
|
|
if (!((startcode >= 0x1c0 && startcode <= 0x1df) ||
|
|
(startcode >= 0x1e0 && startcode <= 0x1ef) ||
|
|
(startcode == 0x1bd)))
|
|
goto redo;
|
|
if (ppos) {
|
|
*ppos = url_ftell(&s->pb) - 4;
|
|
}
|
|
len = get_be16(&s->pb);
|
|
pts = AV_NOPTS_VALUE;
|
|
dts = AV_NOPTS_VALUE;
|
|
/* stuffing */
|
|
for(;;) {
|
|
if (len < 1)
|
|
goto redo;
|
|
c = get_byte(&s->pb);
|
|
len--;
|
|
/* XXX: for mpeg1, should test only bit 7 */
|
|
if (c != 0xff)
|
|
break;
|
|
}
|
|
if ((c & 0xc0) == 0x40) {
|
|
/* buffer scale & size */
|
|
if (len < 2)
|
|
goto redo;
|
|
get_byte(&s->pb);
|
|
c = get_byte(&s->pb);
|
|
len -= 2;
|
|
}
|
|
if ((c & 0xf0) == 0x20) {
|
|
if (len < 4)
|
|
goto redo;
|
|
dts = pts = get_pts(&s->pb, c);
|
|
len -= 4;
|
|
} else if ((c & 0xf0) == 0x30) {
|
|
if (len < 9)
|
|
goto redo;
|
|
pts = get_pts(&s->pb, c);
|
|
dts = get_pts(&s->pb, -1);
|
|
len -= 9;
|
|
} else if ((c & 0xc0) == 0x80) {
|
|
/* mpeg 2 PES */
|
|
if ((c & 0x30) != 0) {
|
|
/* Encrypted multiplex not handled */
|
|
goto redo;
|
|
}
|
|
flags = get_byte(&s->pb);
|
|
header_len = get_byte(&s->pb);
|
|
len -= 2;
|
|
if (header_len > len)
|
|
goto redo;
|
|
if ((flags & 0xc0) == 0x80) {
|
|
dts = pts = get_pts(&s->pb, -1);
|
|
if (header_len < 5)
|
|
goto redo;
|
|
header_len -= 5;
|
|
len -= 5;
|
|
} if ((flags & 0xc0) == 0xc0) {
|
|
pts = get_pts(&s->pb, -1);
|
|
dts = get_pts(&s->pb, -1);
|
|
if (header_len < 10)
|
|
goto redo;
|
|
header_len -= 10;
|
|
len -= 10;
|
|
}
|
|
len -= header_len;
|
|
while (header_len > 0) {
|
|
get_byte(&s->pb);
|
|
header_len--;
|
|
}
|
|
}
|
|
else if( c!= 0xf )
|
|
goto redo;
|
|
|
|
if (startcode == PRIVATE_STREAM_1 && !m->psm_es_type[startcode & 0xff]) {
|
|
if (len < 1)
|
|
goto redo;
|
|
startcode = get_byte(&s->pb);
|
|
len--;
|
|
if (startcode >= 0x80 && startcode <= 0xbf) {
|
|
/* audio: skip header */
|
|
if (len < 3)
|
|
goto redo;
|
|
get_byte(&s->pb);
|
|
get_byte(&s->pb);
|
|
get_byte(&s->pb);
|
|
len -= 3;
|
|
}
|
|
}
|
|
if(dts != AV_NOPTS_VALUE && ppos){
|
|
int i;
|
|
for(i=0; i<s->nb_streams; i++){
|
|
if(startcode == s->streams[i]->id) {
|
|
av_add_index_entry(s->streams[i], *ppos, dts, 0, 0, AVINDEX_KEYFRAME /* FIXME keyframe? */);
|
|
}
|
|
}
|
|
}
|
|
|
|
*pstart_code = startcode;
|
|
*ppts = pts;
|
|
*pdts = dts;
|
|
return len;
|
|
}
|
|
|
|
static int mpegps_read_packet(AVFormatContext *s,
|
|
AVPacket *pkt)
|
|
{
|
|
MpegDemuxContext *m = s->priv_data;
|
|
AVStream *st;
|
|
int len, startcode, i, type, codec_id = 0, es_type;
|
|
int64_t pts, dts, dummy_pos; //dummy_pos is needed for the index building to work
|
|
|
|
redo:
|
|
len = mpegps_read_pes_header(s, &dummy_pos, &startcode, &pts, &dts);
|
|
if (len < 0)
|
|
return 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 > 0){
|
|
if(es_type == STREAM_TYPE_VIDEO_MPEG1){
|
|
codec_id = CODEC_ID_MPEG2VIDEO;
|
|
type = CODEC_TYPE_VIDEO;
|
|
} else if(es_type == STREAM_TYPE_VIDEO_MPEG2){
|
|
codec_id = CODEC_ID_MPEG2VIDEO;
|
|
type = CODEC_TYPE_VIDEO;
|
|
} else if(es_type == STREAM_TYPE_AUDIO_MPEG1 ||
|
|
es_type == STREAM_TYPE_AUDIO_MPEG2){
|
|
codec_id = CODEC_ID_MP3;
|
|
type = CODEC_TYPE_AUDIO;
|
|
} else if(es_type == STREAM_TYPE_AUDIO_AAC){
|
|
codec_id = CODEC_ID_AAC;
|
|
type = CODEC_TYPE_AUDIO;
|
|
} else if(es_type == STREAM_TYPE_VIDEO_MPEG4){
|
|
codec_id = CODEC_ID_MPEG4;
|
|
type = CODEC_TYPE_VIDEO;
|
|
} else if(es_type == STREAM_TYPE_VIDEO_H264){
|
|
codec_id = CODEC_ID_H264;
|
|
type = CODEC_TYPE_VIDEO;
|
|
} else if(es_type == STREAM_TYPE_AUDIO_AC3){
|
|
codec_id = CODEC_ID_AC3;
|
|
type = CODEC_TYPE_AUDIO;
|
|
} else {
|
|
goto skip;
|
|
}
|
|
} else if (startcode >= 0x1e0 && startcode <= 0x1ef) {
|
|
type = CODEC_TYPE_VIDEO;
|
|
codec_id = CODEC_ID_MPEG2VIDEO;
|
|
} else if (startcode >= 0x1c0 && startcode <= 0x1df) {
|
|
type = CODEC_TYPE_AUDIO;
|
|
codec_id = CODEC_ID_MP2;
|
|
} else if (startcode >= 0x80 && startcode <= 0x87) {
|
|
type = CODEC_TYPE_AUDIO;
|
|
codec_id = CODEC_ID_AC3;
|
|
} else if (startcode >= 0x88 && startcode <= 0x9f) {
|
|
type = CODEC_TYPE_AUDIO;
|
|
codec_id = CODEC_ID_DTS;
|
|
} else if (startcode >= 0xa0 && startcode <= 0xbf) {
|
|
type = CODEC_TYPE_AUDIO;
|
|
codec_id = CODEC_ID_PCM_S16BE;
|
|
} else if (startcode >= 0x20 && startcode <= 0x3f) {
|
|
type = CODEC_TYPE_SUBTITLE;
|
|
codec_id = CODEC_ID_DVD_SUBTITLE;
|
|
} else {
|
|
skip:
|
|
/* skip packet */
|
|
url_fskip(&s->pb, len);
|
|
goto redo;
|
|
}
|
|
/* no stream found: add a new stream */
|
|
st = av_new_stream(s, startcode);
|
|
if (!st)
|
|
goto skip;
|
|
st->codec->codec_type = type;
|
|
st->codec->codec_id = codec_id;
|
|
if (codec_id != CODEC_ID_PCM_S16BE)
|
|
st->need_parsing = 1;
|
|
found:
|
|
if(st->discard >= AVDISCARD_ALL)
|
|
goto skip;
|
|
if (startcode >= 0xa0 && startcode <= 0xbf) {
|
|
int b1, freq;
|
|
|
|
/* for LPCM, we just skip the header and consider it is raw
|
|
audio data */
|
|
if (len <= 3)
|
|
goto skip;
|
|
get_byte(&s->pb); /* emphasis (1), muse(1), reserved(1), frame number(5) */
|
|
b1 = get_byte(&s->pb); /* quant (2), freq(2), reserved(1), channels(3) */
|
|
get_byte(&s->pb); /* dynamic range control (0x80 = off) */
|
|
len -= 3;
|
|
freq = (b1 >> 4) & 3;
|
|
st->codec->sample_rate = lpcm_freq_tab[freq];
|
|
st->codec->channels = 1 + (b1 & 7);
|
|
st->codec->bit_rate = st->codec->channels * st->codec->sample_rate * 2;
|
|
}
|
|
av_new_packet(pkt, len);
|
|
get_buffer(&s->pb, pkt->data, pkt->size);
|
|
pkt->pts = pts;
|
|
pkt->dts = dts;
|
|
pkt->stream_index = st->index;
|
|
#if 0
|
|
av_log(s, AV_LOG_DEBUG, "%d: pts=%0.3f dts=%0.3f size=%d\n",
|
|
pkt->stream_index, pkt->pts / 90000.0, pkt->dts / 90000.0, pkt->size);
|
|
#endif
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int mpegps_read_close(AVFormatContext *s)
|
|
{
|
|
return 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;
|
|
#ifdef DEBUG_SEEK
|
|
printf("read_dts: pos=0x%llx next=%d -> ", pos, find_next);
|
|
#endif
|
|
url_fseek(&s->pb, pos, SEEK_SET);
|
|
for(;;) {
|
|
len = mpegps_read_pes_header(s, &pos, &startcode, &pts, &dts);
|
|
if (len < 0) {
|
|
#ifdef DEBUG_SEEK
|
|
printf("none (ret=%d)\n", len);
|
|
#endif
|
|
return AV_NOPTS_VALUE;
|
|
}
|
|
if (startcode == s->streams[stream_index]->id &&
|
|
dts != AV_NOPTS_VALUE) {
|
|
break;
|
|
}
|
|
url_fskip(&s->pb, len);
|
|
}
|
|
#ifdef DEBUG_SEEK
|
|
printf("pos=0x%llx dts=0x%llx %0.3f\n", pos, dts, dts / 90000.0);
|
|
#endif
|
|
*ppos = pos;
|
|
return dts;
|
|
}
|
|
|
|
#ifdef CONFIG_MUXERS
|
|
static AVOutputFormat mpeg1system_mux = {
|
|
"mpeg",
|
|
"MPEG1 System format",
|
|
"video/mpeg",
|
|
"mpg,mpeg",
|
|
sizeof(MpegMuxContext),
|
|
CODEC_ID_MP2,
|
|
CODEC_ID_MPEG1VIDEO,
|
|
mpeg_mux_init,
|
|
mpeg_mux_write_packet,
|
|
mpeg_mux_end,
|
|
};
|
|
|
|
static AVOutputFormat mpeg1vcd_mux = {
|
|
"vcd",
|
|
"MPEG1 System format (VCD)",
|
|
"video/mpeg",
|
|
NULL,
|
|
sizeof(MpegMuxContext),
|
|
CODEC_ID_MP2,
|
|
CODEC_ID_MPEG1VIDEO,
|
|
mpeg_mux_init,
|
|
mpeg_mux_write_packet,
|
|
mpeg_mux_end,
|
|
};
|
|
|
|
static AVOutputFormat mpeg2vob_mux = {
|
|
"vob",
|
|
"MPEG2 PS format (VOB)",
|
|
"video/mpeg",
|
|
"vob",
|
|
sizeof(MpegMuxContext),
|
|
CODEC_ID_MP2,
|
|
CODEC_ID_MPEG2VIDEO,
|
|
mpeg_mux_init,
|
|
mpeg_mux_write_packet,
|
|
mpeg_mux_end,
|
|
};
|
|
|
|
/* Same as mpeg2vob_mux except that the pack size is 2324 */
|
|
static AVOutputFormat mpeg2svcd_mux = {
|
|
"svcd",
|
|
"MPEG2 PS format (VOB)",
|
|
"video/mpeg",
|
|
"vob",
|
|
sizeof(MpegMuxContext),
|
|
CODEC_ID_MP2,
|
|
CODEC_ID_MPEG2VIDEO,
|
|
mpeg_mux_init,
|
|
mpeg_mux_write_packet,
|
|
mpeg_mux_end,
|
|
};
|
|
|
|
/* Same as mpeg2vob_mux except the 'is_dvd' flag is set to produce NAV pkts */
|
|
static AVOutputFormat mpeg2dvd_mux = {
|
|
"dvd",
|
|
"MPEG2 PS format (DVD VOB)",
|
|
"video/mpeg",
|
|
"dvd",
|
|
sizeof(MpegMuxContext),
|
|
CODEC_ID_MP2,
|
|
CODEC_ID_MPEG2VIDEO,
|
|
mpeg_mux_init,
|
|
mpeg_mux_write_packet,
|
|
mpeg_mux_end,
|
|
};
|
|
|
|
#endif //CONFIG_MUXERS
|
|
|
|
AVInputFormat mpegps_demux = {
|
|
"mpeg",
|
|
"MPEG PS format",
|
|
sizeof(MpegDemuxContext),
|
|
mpegps_probe,
|
|
mpegps_read_header,
|
|
mpegps_read_packet,
|
|
mpegps_read_close,
|
|
NULL, //mpegps_read_seek,
|
|
mpegps_read_dts,
|
|
.flags = AVFMT_SHOW_IDS,
|
|
};
|
|
|
|
int mpegps_init(void)
|
|
{
|
|
#ifdef CONFIG_MUXERS
|
|
av_register_output_format(&mpeg1system_mux);
|
|
av_register_output_format(&mpeg1vcd_mux);
|
|
av_register_output_format(&mpeg2vob_mux);
|
|
av_register_output_format(&mpeg2svcd_mux);
|
|
av_register_output_format(&mpeg2dvd_mux);
|
|
#endif //CONFIG_MUXERS
|
|
av_register_input_format(&mpegps_demux);
|
|
return 0;
|
|
}
|