1381 lines
48 KiB
C
1381 lines
48 KiB
C
/*
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* MPEG-1/2 muxer
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* Copyright (c) 2000, 2001, 2002 Fabrice Bellard
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <stdint.h>
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#include "libavutil/attributes.h"
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#include "libavutil/fifo.h"
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#include "libavutil/log.h"
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#include "libavutil/mathematics.h"
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#include "libavutil/opt.h"
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#include "libavcodec/put_bits.h"
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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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#define MAX_PAYLOAD_SIZE 4096
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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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struct PacketDesc *next;
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} PacketDesc;
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typedef struct StreamInfo {
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AVFifoBuffer *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; /* start of packet queue */
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PacketDesc *last_packet; /* end of packet queue */
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PacketDesc *premux_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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int bytes_to_iframe;
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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 MpegMuxContext {
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const AVClass *class;
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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 user_mux_rate; /* bitrate in units of bits/s */
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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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int64_t vcd_padding_bitrate_num;
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int64_t vcd_padding_bytes_written;
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int preload;
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} MpegMuxContext;
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extern AVOutputFormat ff_mpeg1vcd_muxer;
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extern AVOutputFormat ff_mpeg2dvd_muxer;
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extern AVOutputFormat ff_mpeg2svcd_muxer;
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extern AVOutputFormat ff_mpeg2vob_muxer;
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static int put_pack_header(AVFormatContext *ctx, uint8_t *buf,
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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_bits32(&pb, 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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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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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 put_bits_ptr(&pb) - pb.buf;
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}
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static int put_system_header(AVFormatContext *ctx, uint8_t *buf,
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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_bits32(&pb, 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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/* maximum bit rate of the multiplexed stream */
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put_bits(&pb, 22, s->mux_rate);
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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
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* (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); /* nonconstrained bitstream */
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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 & 0xe0) == AUDIO_ID) {
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/* This header applies only to the audio stream
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* (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 &&
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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 &&
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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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} 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 (AC-3 uses 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 = put_bits_ptr(&pb) - pb.buf;
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/* patch packet size */
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AV_WB16(buf + 4, size - 6);
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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 av_cold 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, h264_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 = (CONFIG_MPEG1VCD_MUXER && ctx->oformat == &ff_mpeg1vcd_muxer);
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s->is_svcd = (CONFIG_MPEG2SVCD_MUXER && ctx->oformat == &ff_mpeg2svcd_muxer);
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s->is_mpeg2 = ((CONFIG_MPEG2VOB_MUXER && ctx->oformat == &ff_mpeg2vob_muxer) ||
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(CONFIG_MPEG2DVD_MUXER && ctx->oformat == &ff_mpeg2dvd_muxer) ||
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(CONFIG_MPEG2SVCD_MUXER && ctx->oformat == &ff_mpeg2svcd_muxer));
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s->is_dvd = (CONFIG_MPEG2DVD_MUXER && ctx->oformat == &ff_mpeg2dvd_muxer);
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if (ctx->packet_size) {
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if (ctx->packet_size < 20 || ctx->packet_size > (1 << 23) + 10) {
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av_log(ctx, AV_LOG_ERROR, "Invalid packet size %d\n",
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ctx->packet_size);
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return AVERROR(EINVAL);
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}
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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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if (ctx->max_delay < 0) /* Not set by the caller */
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ctx->max_delay = AV_TIME_BASE*7/10;
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s->vcd_padding_bytes_written = 0;
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s->vcd_padding_bitrate_num = 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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h264_id = H264_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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AVCPBProperties *props;
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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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return AVERROR(ENOMEM);
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st->priv_data = stream;
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avpriv_set_pts_info(st, 64, 1, 90000);
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switch (st->codecpar->codec_type) {
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case AVMEDIA_TYPE_AUDIO:
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if (!s->is_mpeg2 &&
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(st->codecpar->codec_id == AV_CODEC_ID_AC3 ||
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st->codecpar->codec_id == AV_CODEC_ID_DTS ||
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st->codecpar->codec_id == AV_CODEC_ID_PCM_S16BE ||
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st->codecpar->codec_id == AV_CODEC_ID_PCM_DVD))
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av_log(ctx, AV_LOG_WARNING,
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"%s in MPEG-1 system streams is not widely supported, "
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"consider using the vob or the dvd muxer "
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"to force a MPEG-2 program stream.\n",
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avcodec_get_name(st->codecpar->codec_id));
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if (st->codecpar->codec_id == AV_CODEC_ID_AC3) {
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stream->id = ac3_id++;
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} else if (st->codecpar->codec_id == AV_CODEC_ID_DTS) {
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stream->id = dts_id++;
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} else if (st->codecpar->codec_id == AV_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->codecpar->sample_rate)
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break;
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}
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if (j == 4) {
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int sr;
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av_log(ctx, AV_LOG_ERROR, "Invalid sampling rate for PCM stream.\n");
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av_log(ctx, AV_LOG_INFO, "Allowed sampling rates:");
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for (sr = 0; sr < 4; sr++)
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av_log(ctx, AV_LOG_INFO, " %d", lpcm_freq_tab[sr]);
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av_log(ctx, AV_LOG_INFO, "\n");
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return AVERROR(EINVAL);
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}
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if (st->codecpar->channels > 8) {
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av_log(ctx, AV_LOG_ERROR, "At most 8 channels allowed for LPCM streams.\n");
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return AVERROR(EINVAL);
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}
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stream->lpcm_header[0] = 0x0c;
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stream->lpcm_header[1] = (st->codecpar->channels - 1) | (j << 4);
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stream->lpcm_header[2] = 0x80;
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stream->lpcm_align = st->codecpar->channels * 2;
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} else if (st->codecpar->codec_id == AV_CODEC_ID_PCM_DVD) {
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int freq;
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switch (st->codecpar->sample_rate) {
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case 48000: freq = 0; break;
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case 96000: freq = 1; break;
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case 44100: freq = 2; break;
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case 32000: freq = 3; break;
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default:
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av_log(ctx, AV_LOG_ERROR, "Unsupported sample rate.\n");
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return AVERROR(EINVAL);
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}
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stream->lpcm_header[0] = 0x0c;
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stream->lpcm_header[1] = (freq << 4) |
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(((st->codecpar->bits_per_coded_sample - 16) / 4) << 6) |
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st->codecpar->channels - 1;
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stream->lpcm_header[2] = 0x80;
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stream->id = lpcm_id++;
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stream->lpcm_align = st->codecpar->channels * st->codecpar->bits_per_coded_sample / 8;
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} else if (st->codecpar->codec_id == AV_CODEC_ID_MLP ||
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st->codecpar->codec_id == AV_CODEC_ID_TRUEHD) {
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av_log(ctx, AV_LOG_ERROR, "Support for muxing audio codec %s not implemented.\n",
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avcodec_get_name(st->codecpar->codec_id));
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return AVERROR_PATCHWELCOME;
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} else if (st->codecpar->codec_id != AV_CODEC_ID_MP1 &&
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st->codecpar->codec_id != AV_CODEC_ID_MP2 &&
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st->codecpar->codec_id != AV_CODEC_ID_MP3) {
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av_log(ctx, AV_LOG_ERROR, "Unsupported audio codec. Must be one of mp1, mp2, mp3, 16-bit pcm_dvd, pcm_s16be, ac3 or dts.\n");
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return AVERROR(EINVAL);
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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 AVMEDIA_TYPE_VIDEO:
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if (st->codecpar->codec_id == AV_CODEC_ID_H264)
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stream->id = h264_id++;
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else
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stream->id = mpv_id++;
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props = (AVCPBProperties*)av_stream_get_side_data(st, AV_PKT_DATA_CPB_PROPERTIES, NULL);
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if (props && props->buffer_size)
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stream->max_buffer_size = 6 * 1024 + props->buffer_size / 8;
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else {
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av_log(ctx, AV_LOG_WARNING,
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"VBV buffer size not set, using default size of 230KB\n"
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"If you want the mpeg file to be compliant to some specification\n"
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"Like DVD, VCD or others, make sure you set the correct buffer size\n");
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// FIXME: this is probably too small as default
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stream->max_buffer_size = 230 * 1024;
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}
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if (stream->max_buffer_size > 1024 * 8191) {
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av_log(ctx, AV_LOG_WARNING, "buffer size %d, too large\n", stream->max_buffer_size);
|
|
stream->max_buffer_size = 1024 * 8191;
|
|
}
|
|
s->video_bound++;
|
|
break;
|
|
case AVMEDIA_TYPE_SUBTITLE:
|
|
stream->id = mps_id++;
|
|
stream->max_buffer_size = 16 * 1024;
|
|
break;
|
|
default:
|
|
av_log(ctx, AV_LOG_ERROR, "Invalid media type %s for output stream #%d\n",
|
|
av_get_media_type_string(st->codecpar->codec_type), i);
|
|
return AVERROR(EINVAL);
|
|
}
|
|
stream->fifo = av_fifo_alloc(16);
|
|
if (!stream->fifo)
|
|
return AVERROR(ENOMEM);
|
|
}
|
|
bitrate = 0;
|
|
audio_bitrate = 0;
|
|
video_bitrate = 0;
|
|
for (i = 0; i < ctx->nb_streams; i++) {
|
|
AVCPBProperties *props;
|
|
int codec_rate;
|
|
st = ctx->streams[i];
|
|
stream = (StreamInfo *)st->priv_data;
|
|
|
|
props = (AVCPBProperties*)av_stream_get_side_data(st, AV_PKT_DATA_CPB_PROPERTIES, NULL);
|
|
if (props)
|
|
codec_rate = props->max_bitrate;
|
|
else
|
|
codec_rate = st->codecpar->bit_rate;
|
|
|
|
if (!codec_rate)
|
|
codec_rate = (1 << 21) * 8 * 50 / ctx->nb_streams;
|
|
|
|
bitrate += codec_rate;
|
|
|
|
if ((stream->id & 0xe0) == AUDIO_ID)
|
|
audio_bitrate += codec_rate;
|
|
else if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO)
|
|
video_bitrate += codec_rate;
|
|
}
|
|
|
|
if (s->user_mux_rate) {
|
|
s->mux_rate = (s->user_mux_rate + (8 * 50) - 1) / (8 * 50);
|
|
} else {
|
|
/* we increase slightly the bitrate to take into account the
|
|
* headers. XXX: compute it exactly */
|
|
bitrate += bitrate / 20;
|
|
bitrate += 10000;
|
|
s->mux_rate = (bitrate + (8 * 50) - 1) / (8 * 50);
|
|
if (s->mux_rate >= (1<<22)) {
|
|
av_log(ctx, AV_LOG_WARNING, "mux rate %d is too large\n", s->mux_rate);
|
|
s->mux_rate = (1<<22) - 1;
|
|
}
|
|
}
|
|
|
|
if (s->is_vcd) {
|
|
int64_t overhead_rate;
|
|
|
|
/* The VCD standard mandates that the mux_rate field is 3528
|
|
* (see standard p. IV-6).
|
|
* The value is actually "wrong", i.e. if you calculate
|
|
* 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
|
|
* field in the header must have this value. */
|
|
// s->mux_rate = 2352 * 75 / 50; /* = 3528 */
|
|
|
|
/* 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 * 2294LL * (2324 - 2279);
|
|
overhead_rate += video_bitrate * 2279LL * (2324 - 2294);
|
|
|
|
/* Add padding so that the full bitrate is 2324*75 bytes/sec */
|
|
s->vcd_padding_bitrate_num = (2324LL * 75 * 8 - bitrate) * 2279 * 2294 - overhead_rate;
|
|
#define VCD_PADDING_BITRATE_DEN (2279 * 2294)
|
|
}
|
|
|
|
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 = AV_NOPTS_VALUE;
|
|
return 0;
|
|
}
|
|
|
|
static inline void put_timestamp(AVIOContext *pb, int id, int64_t timestamp)
|
|
{
|
|
avio_w8(pb, (id << 4) | (((timestamp >> 30) & 0x07) << 1) | 1);
|
|
avio_wb16(pb, (uint16_t)((((timestamp >> 15) & 0x7fff) << 1) | 1));
|
|
avio_wb16(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_num > 0 && pts != AV_NOPTS_VALUE) {
|
|
int64_t full_pad_bytes;
|
|
|
|
// FIXME: this is wrong
|
|
full_pad_bytes =
|
|
av_rescale(s->vcd_padding_bitrate_num, pts, 90000LL * 8 * VCD_PADDING_BITRATE_DEN);
|
|
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;
|
|
}
|
|
|
|
/* Write an MPEG padding packet header. */
|
|
static void put_padding_packet(AVFormatContext *ctx, AVIOContext *pb,
|
|
int packet_bytes)
|
|
{
|
|
MpegMuxContext *s = ctx->priv_data;
|
|
int i;
|
|
|
|
avio_wb32(pb, PADDING_STREAM);
|
|
avio_wb16(pb, packet_bytes - 6);
|
|
if (!s->is_mpeg2) {
|
|
avio_w8(pb, 0x0f);
|
|
packet_bytes -= 7;
|
|
} else
|
|
packet_bytes -= 6;
|
|
|
|
for (i = 0; i < packet_bytes; i++)
|
|
avio_w8(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;
|
|
/* "general" pack without data specific to one stream? */
|
|
int general_pack = 0;
|
|
int nb_frames;
|
|
|
|
id = stream->id;
|
|
|
|
av_log(ctx, AV_LOG_TRACE, "packet ID=%2x PTS=%0.3f\n", id, pts / 90000.0);
|
|
|
|
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 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 (stream->bytes_to_iframe == 0 || s->packet_number == 0) {
|
|
size = put_system_header(ctx, buf_ptr, 0);
|
|
buf_ptr += size;
|
|
size = buf_ptr - buffer;
|
|
avio_write(ctx->pb, buffer, size);
|
|
|
|
avio_wb32(ctx->pb, PRIVATE_STREAM_2);
|
|
avio_wb16(ctx->pb, 0x03d4); // length
|
|
avio_w8(ctx->pb, 0x00); // substream ID, 00=PCI
|
|
for (i = 0; i < 979; i++)
|
|
avio_w8(ctx->pb, 0x00);
|
|
|
|
avio_wb32(ctx->pb, PRIVATE_STREAM_2);
|
|
avio_wb16(ctx->pb, 0x03fa); // length
|
|
avio_w8(ctx->pb, 0x01); // substream ID, 01=DSI
|
|
for (i = 0; i < 1017; i++)
|
|
avio_w8(ctx->pb, 0x00);
|
|
|
|
memset(buffer, 0, 128);
|
|
buf_ptr = buffer;
|
|
s->packet_number++;
|
|
stream->align_iframe = 0;
|
|
// FIXME: rounding and first few bytes of each packet
|
|
scr += s->packet_size * 90000LL /
|
|
(s->mux_rate * 50LL);
|
|
size = put_pack_header(ctx, buf_ptr, scr);
|
|
s->last_scr = scr;
|
|
buf_ptr += size;
|
|
/* GOP Start */
|
|
} else if (stream->bytes_to_iframe < PES_bytes_to_fill) {
|
|
pad_packet_bytes = PES_bytes_to_fill -
|
|
stream->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;
|
|
avio_write(ctx->pb, buffer, size);
|
|
|
|
packet_size = s->packet_size - size;
|
|
|
|
if (s->is_vcd && (id & 0xe0) == 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)
|
|
/* the system header refers to both streams and no stream data */
|
|
general_pack = 1;
|
|
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 - av_fifo_size(stream->fifo);
|
|
|
|
// first byte does not 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;
|
|
}
|
|
|
|
// can't use padding, so use stuffing
|
|
if (pad_packet_bytes > 0 && pad_packet_bytes <= 7) {
|
|
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 (startcode == PRIVATE_STREAM_1 && id >= 0xa0) {
|
|
if (payload_size < av_fifo_size(stream->fifo))
|
|
stuffing_size += payload_size % stream->lpcm_align;
|
|
}
|
|
|
|
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);
|
|
|
|
avio_wb32(ctx->pb, startcode);
|
|
|
|
avio_wb16(ctx->pb, packet_size);
|
|
|
|
if (!s->is_mpeg2)
|
|
for (i = 0; i < stuffing_size; i++)
|
|
avio_w8(ctx->pb, 0xff);
|
|
|
|
if (s->is_mpeg2) {
|
|
avio_w8(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;
|
|
|
|
avio_w8(ctx->pb, pes_flags); /* flags */
|
|
avio_w8(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 */
|
|
avio_w8(ctx->pb, 0x10); /* flags */
|
|
|
|
/* P-STD buffer info */
|
|
if ((id & 0xe0) == AUDIO_ID)
|
|
avio_wb16(ctx->pb, 0x4000 | stream->max_buffer_size / 128);
|
|
else
|
|
avio_wb16(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 {
|
|
avio_w8(ctx->pb, 0x0f);
|
|
}
|
|
}
|
|
|
|
if (s->is_mpeg2) {
|
|
/* special stuffing byte that is always written
|
|
* to prevent accidental generation of start codes. */
|
|
avio_w8(ctx->pb, 0xff);
|
|
|
|
for (i = 0; i < stuffing_size; i++)
|
|
avio_w8(ctx->pb, 0xff);
|
|
}
|
|
|
|
if (startcode == PRIVATE_STREAM_1) {
|
|
avio_w8(ctx->pb, id);
|
|
if (id >= 0xa0) {
|
|
/* LPCM (XXX: check nb_frames) */
|
|
avio_w8(ctx->pb, 7);
|
|
avio_wb16(ctx->pb, 4); /* skip 3 header bytes */
|
|
avio_w8(ctx->pb, stream->lpcm_header[0]);
|
|
avio_w8(ctx->pb, stream->lpcm_header[1]);
|
|
avio_w8(ctx->pb, stream->lpcm_header[2]);
|
|
} else if (id >= 0x40) {
|
|
/* AC-3 */
|
|
avio_w8(ctx->pb, nb_frames);
|
|
avio_wb16(ctx->pb, trailer_size + 1);
|
|
}
|
|
}
|
|
|
|
/* output data */
|
|
av_assert0(payload_size - stuffing_size <= av_fifo_size(stream->fifo));
|
|
av_fifo_generic_read(stream->fifo, ctx->pb,
|
|
payload_size - stuffing_size,
|
|
(void (*)(void*, void*, int))avio_write);
|
|
stream->bytes_to_iframe -= payload_size - stuffing_size;
|
|
} 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++)
|
|
avio_w8(ctx->pb, 0x00);
|
|
|
|
avio_write_marker(ctx->pb, AV_NOPTS_VALUE, AVIO_DATA_MARKER_FLUSH_POINT);
|
|
|
|
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++)
|
|
avio_w8(ctx->pb, 0);
|
|
|
|
s->vcd_padding_bytes_written += s->packet_size;
|
|
|
|
avio_write_marker(ctx->pb, AV_NOPTS_VALUE, AVIO_DATA_MARKER_FLUSH_POINT);
|
|
|
|
/* 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++;
|
|
}
|
|
|
|
static int remove_decoded_packets(AVFormatContext *ctx, int64_t scr)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < ctx->nb_streams; i++) {
|
|
AVStream *st = ctx->streams[i];
|
|
StreamInfo *stream = st->priv_data;
|
|
PacketDesc *pkt_desc;
|
|
|
|
while ((pkt_desc = stream->predecode_packet) &&
|
|
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 st=%d bufi=%d size=%d\n",
|
|
i, stream->buffer_index, pkt_desc->size);
|
|
break;
|
|
}
|
|
stream->buffer_index -= pkt_desc->size;
|
|
stream->predecode_packet = pkt_desc->next;
|
|
if (!stream->predecode_packet)
|
|
stream->last_packet = NULL;
|
|
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 = 0, es_size, trailer_size;
|
|
int best_i = -1;
|
|
int best_score = INT_MIN;
|
|
int ignore_constraints = 0;
|
|
int ignore_delay = 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 = av_fifo_size(stream->fifo);
|
|
const int space = stream->max_buffer_size - stream->buffer_index;
|
|
int rel_space = 1024LL * 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->codecpar->codec_type != AVMEDIA_TYPE_SUBTITLE)
|
|
return 0;
|
|
if (avail_data == 0)
|
|
continue;
|
|
av_assert0(avail_data > 0);
|
|
|
|
if (space < s->packet_size && !ignore_constraints)
|
|
continue;
|
|
|
|
if (next_pkt && next_pkt->dts - scr > max_delay && !ignore_delay)
|
|
continue;
|
|
if ( stream->predecode_packet
|
|
&& stream->predecode_packet->size > stream->buffer_index)
|
|
rel_space += 1<<28;
|
|
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;
|
|
int has_premux = 0;
|
|
|
|
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;
|
|
has_premux |= !!stream->premux_packet;
|
|
}
|
|
|
|
if (best_dts < INT64_MAX) {
|
|
av_log(ctx, AV_LOG_TRACE, "bumping scr, scr:%f, dts:%f\n",
|
|
scr / 90000.0, best_dts / 90000.0);
|
|
|
|
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;
|
|
} else if (has_premux && flush) {
|
|
av_log(ctx, AV_LOG_ERROR,
|
|
"delay too large, ignoring ...\n");
|
|
ignore_delay = 1;
|
|
ignore_constraints = 1;
|
|
} else
|
|
return 0;
|
|
|
|
goto retry;
|
|
}
|
|
|
|
av_assert0(best_i >= 0);
|
|
|
|
st = ctx->streams[best_i];
|
|
stream = st->priv_data;
|
|
|
|
av_assert0(av_fifo_size(stream->fifo) > 0);
|
|
|
|
av_assert0(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_TRACE, "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 {
|
|
av_assert0(av_fifo_size(stream->fifo) == 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;
|
|
|
|
// FIXME: pts cannot be correct here
|
|
while ((vcd_pad_bytes = get_vcd_padding_size(ctx, stream->premux_packet->pts)) >= s->packet_size) {
|
|
put_vcd_padding_sector(ctx);
|
|
// FIXME: rounding and first few bytes of each packet
|
|
s->last_scr += s->packet_size * 90000LL / (s->mux_rate * 50LL);
|
|
}
|
|
}
|
|
|
|
stream->buffer_index += es_size;
|
|
// FIXME: rounding and first few bytes of each packet
|
|
s->last_scr += s->packet_size * 90000LL / (s->mux_rate * 50LL);
|
|
|
|
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) {
|
|
av_assert0(stream->premux_packet);
|
|
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)
|
|
{
|
|
int stream_index = pkt->stream_index;
|
|
int size = pkt->size;
|
|
uint8_t *buf = pkt->data;
|
|
MpegMuxContext *s = ctx->priv_data;
|
|
AVStream *st = ctx->streams[stream_index];
|
|
StreamInfo *stream = st->priv_data;
|
|
int64_t pts, dts;
|
|
PacketDesc *pkt_desc;
|
|
int preload, ret;
|
|
const int is_iframe = st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO &&
|
|
(pkt->flags & AV_PKT_FLAG_KEY);
|
|
|
|
preload = av_rescale(s->preload, 90000, AV_TIME_BASE);
|
|
|
|
pts = pkt->pts;
|
|
dts = pkt->dts;
|
|
|
|
if (s->last_scr == AV_NOPTS_VALUE) {
|
|
if (dts == AV_NOPTS_VALUE || (dts < preload && ctx->avoid_negative_ts) || s->is_dvd) {
|
|
if (dts != AV_NOPTS_VALUE)
|
|
s->preload += av_rescale(-dts, AV_TIME_BASE, 90000);
|
|
s->last_scr = 0;
|
|
} else {
|
|
s->last_scr = dts - preload;
|
|
s->preload = 0;
|
|
}
|
|
preload = av_rescale(s->preload, 90000, AV_TIME_BASE);
|
|
av_log(ctx, AV_LOG_DEBUG, "First SCR: %"PRId64" First DTS: %"PRId64"\n", s->last_scr, dts + preload);
|
|
}
|
|
|
|
if (dts != AV_NOPTS_VALUE) dts += preload;
|
|
if (pts != AV_NOPTS_VALUE) pts += preload;
|
|
|
|
av_log(ctx, AV_LOG_TRACE, "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 (st->codecpar->codec_id == AV_CODEC_ID_PCM_DVD) {
|
|
if (size < 3) {
|
|
av_log(ctx, AV_LOG_ERROR, "Invalid packet size %d\n", size);
|
|
return AVERROR(EINVAL);
|
|
}
|
|
|
|
/* Skip first 3 bytes of packet data, which comprise PCM header
|
|
and will be written fresh by this muxer. */
|
|
buf += 3;
|
|
size -= 3;
|
|
}
|
|
|
|
pkt_desc = av_mallocz(sizeof(PacketDesc));
|
|
if (!pkt_desc)
|
|
return AVERROR(ENOMEM);
|
|
if (!stream->predecode_packet) {
|
|
stream->predecode_packet = pkt_desc;
|
|
} else
|
|
stream->last_packet->next = pkt_desc;
|
|
stream->last_packet = pkt_desc;
|
|
if (!stream->premux_packet)
|
|
stream->premux_packet = pkt_desc;
|
|
pkt_desc->pts = pts;
|
|
pkt_desc->dts = dts;
|
|
pkt_desc->unwritten_size =
|
|
pkt_desc->size = size;
|
|
|
|
ret = av_fifo_realloc2(stream->fifo, av_fifo_size(stream->fifo) + size);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (s->is_dvd) {
|
|
// min VOBU length 0.4 seconds (mpucoder)
|
|
if (is_iframe &&
|
|
(s->packet_number == 0 || pts != AV_NOPTS_VALUE &&
|
|
(pts - stream->vobu_start_pts >= 36000))) {
|
|
stream->bytes_to_iframe = av_fifo_size(stream->fifo);
|
|
stream->align_iframe = 1;
|
|
stream->vobu_start_pts = pts;
|
|
}
|
|
}
|
|
|
|
av_fifo_generic_write(stream->fifo, buf, size, NULL);
|
|
|
|
for (;;) {
|
|
int ret = output_packet(ctx, 0);
|
|
if (ret <= 0)
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
static int mpeg_mux_end(AVFormatContext *ctx)
|
|
{
|
|
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 MPEG-1 systems standard. We do not write
|
|
* it as it is usually not needed by decoders and because it
|
|
* complicates MPEG stream concatenation. */
|
|
// avio_wb32(ctx->pb, ISO_11172_END_CODE);
|
|
|
|
for (i = 0; i < ctx->nb_streams; i++) {
|
|
stream = ctx->streams[i]->priv_data;
|
|
|
|
av_assert0(av_fifo_size(stream->fifo) == 0);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void mpeg_mux_deinit(AVFormatContext *ctx)
|
|
{
|
|
for (int i = 0; i < ctx->nb_streams; i++) {
|
|
StreamInfo *stream = ctx->streams[i]->priv_data;
|
|
if (!stream)
|
|
continue;
|
|
for (PacketDesc *pkt = stream->predecode_packet; pkt; ) {
|
|
PacketDesc *tmp = pkt->next;
|
|
av_free(pkt);
|
|
pkt = tmp;
|
|
}
|
|
av_fifo_freep(&stream->fifo);
|
|
}
|
|
}
|
|
|
|
#define OFFSET(x) offsetof(MpegMuxContext, x)
|
|
#define E AV_OPT_FLAG_ENCODING_PARAM
|
|
static const AVOption options[] = {
|
|
{ "muxrate", NULL, OFFSET(user_mux_rate), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, ((1<<22) - 1) * (8 * 50), E },
|
|
{ "preload", "Initial demux-decode delay in microseconds.", OFFSET(preload), AV_OPT_TYPE_INT, { .i64 = 500000 }, 0, INT_MAX, E },
|
|
{ NULL },
|
|
};
|
|
|
|
#define MPEGENC_CLASS(flavor) \
|
|
static const AVClass flavor ## _class = { \
|
|
.class_name = #flavor " muxer", \
|
|
.item_name = av_default_item_name, \
|
|
.version = LIBAVUTIL_VERSION_INT, \
|
|
.option = options, \
|
|
};
|
|
|
|
#if CONFIG_MPEG1SYSTEM_MUXER
|
|
MPEGENC_CLASS(mpeg)
|
|
AVOutputFormat ff_mpeg1system_muxer = {
|
|
.name = "mpeg",
|
|
.long_name = NULL_IF_CONFIG_SMALL("MPEG-1 Systems / MPEG program stream"),
|
|
.mime_type = "video/mpeg",
|
|
.extensions = "mpg,mpeg",
|
|
.priv_data_size = sizeof(MpegMuxContext),
|
|
.audio_codec = AV_CODEC_ID_MP2,
|
|
.video_codec = AV_CODEC_ID_MPEG1VIDEO,
|
|
.write_header = mpeg_mux_init,
|
|
.write_packet = mpeg_mux_write_packet,
|
|
.write_trailer = mpeg_mux_end,
|
|
.deinit = mpeg_mux_deinit,
|
|
.priv_class = &mpeg_class,
|
|
};
|
|
#endif
|
|
|
|
#if CONFIG_MPEG1VCD_MUXER
|
|
MPEGENC_CLASS(vcd)
|
|
AVOutputFormat ff_mpeg1vcd_muxer = {
|
|
.name = "vcd",
|
|
.long_name = NULL_IF_CONFIG_SMALL("MPEG-1 Systems / MPEG program stream (VCD)"),
|
|
.mime_type = "video/mpeg",
|
|
.priv_data_size = sizeof(MpegMuxContext),
|
|
.audio_codec = AV_CODEC_ID_MP2,
|
|
.video_codec = AV_CODEC_ID_MPEG1VIDEO,
|
|
.write_header = mpeg_mux_init,
|
|
.write_packet = mpeg_mux_write_packet,
|
|
.write_trailer = mpeg_mux_end,
|
|
.deinit = mpeg_mux_deinit,
|
|
.priv_class = &vcd_class,
|
|
};
|
|
#endif
|
|
|
|
#if CONFIG_MPEG2VOB_MUXER
|
|
MPEGENC_CLASS(vob)
|
|
AVOutputFormat ff_mpeg2vob_muxer = {
|
|
.name = "vob",
|
|
.long_name = NULL_IF_CONFIG_SMALL("MPEG-2 PS (VOB)"),
|
|
.mime_type = "video/mpeg",
|
|
.extensions = "vob",
|
|
.priv_data_size = sizeof(MpegMuxContext),
|
|
.audio_codec = AV_CODEC_ID_MP2,
|
|
.video_codec = AV_CODEC_ID_MPEG2VIDEO,
|
|
.write_header = mpeg_mux_init,
|
|
.write_packet = mpeg_mux_write_packet,
|
|
.write_trailer = mpeg_mux_end,
|
|
.deinit = mpeg_mux_deinit,
|
|
.priv_class = &vob_class,
|
|
};
|
|
#endif
|
|
|
|
/* Same as mpeg2vob_mux except that the pack size is 2324 */
|
|
#if CONFIG_MPEG2SVCD_MUXER
|
|
MPEGENC_CLASS(svcd)
|
|
AVOutputFormat ff_mpeg2svcd_muxer = {
|
|
.name = "svcd",
|
|
.long_name = NULL_IF_CONFIG_SMALL("MPEG-2 PS (SVCD)"),
|
|
.mime_type = "video/mpeg",
|
|
.extensions = "vob",
|
|
.priv_data_size = sizeof(MpegMuxContext),
|
|
.audio_codec = AV_CODEC_ID_MP2,
|
|
.video_codec = AV_CODEC_ID_MPEG2VIDEO,
|
|
.write_header = mpeg_mux_init,
|
|
.write_packet = mpeg_mux_write_packet,
|
|
.write_trailer = mpeg_mux_end,
|
|
.deinit = mpeg_mux_deinit,
|
|
.priv_class = &svcd_class,
|
|
};
|
|
#endif
|
|
|
|
/* Same as mpeg2vob_mux except the 'is_dvd' flag is set to produce NAV pkts */
|
|
#if CONFIG_MPEG2DVD_MUXER
|
|
MPEGENC_CLASS(dvd)
|
|
AVOutputFormat ff_mpeg2dvd_muxer = {
|
|
.name = "dvd",
|
|
.long_name = NULL_IF_CONFIG_SMALL("MPEG-2 PS (DVD VOB)"),
|
|
.mime_type = "video/mpeg",
|
|
.extensions = "dvd",
|
|
.priv_data_size = sizeof(MpegMuxContext),
|
|
.audio_codec = AV_CODEC_ID_MP2,
|
|
.video_codec = AV_CODEC_ID_MPEG2VIDEO,
|
|
.write_header = mpeg_mux_init,
|
|
.write_packet = mpeg_mux_write_packet,
|
|
.write_trailer = mpeg_mux_end,
|
|
.deinit = mpeg_mux_deinit,
|
|
.priv_class = &dvd_class,
|
|
};
|
|
#endif
|