mirror of
https://git.ffmpeg.org/ffmpeg.git
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656 lines
18 KiB
C
656 lines
18 KiB
C
/*
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* Output a MPEG1 multiplexed video/audio stream
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* Copyright (c) 2000 Gerard Lantau.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "avformat.h"
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#define MAX_PAYLOAD_SIZE 4096
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#define NB_STREAMS 2
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typedef struct {
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UINT8 buffer[MAX_PAYLOAD_SIZE];
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int buffer_ptr;
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UINT8 id;
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int max_buffer_size; /* in bytes */
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int packet_number;
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float pts;
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INT64 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_data_max_size; /* maximum data size inside a packet */
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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 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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} 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 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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static int put_pack_header(AVFormatContext *ctx,
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UINT8 *buf, INT64 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, NULL, NULL);
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put_bits(&pb, 32, PACK_START_CODE);
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put_bits(&pb, 4, 0x2);
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put_bits(&pb, 3, (UINT32)((timestamp >> 30) & 0x07));
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put_bits(&pb, 1, 1);
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put_bits(&pb, 15, (UINT32)((timestamp >> 15) & 0x7fff));
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put_bits(&pb, 1, 1);
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put_bits(&pb, 15, (UINT32)((timestamp) & 0x7fff));
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put_bits(&pb, 1, 1);
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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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flush_put_bits(&pb);
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return pb.buf_ptr - pb.buf;
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}
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static int put_system_header(AVFormatContext *ctx, UINT8 *buf)
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{
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MpegMuxContext *s = ctx->priv_data;
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int size, rate_bound, i, private_stream_coded, id;
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PutBitContext pb;
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init_put_bits(&pb, buf, 128, NULL, NULL);
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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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rate_bound = s->mux_rate; /* maximum bit rate of the multiplexed stream */
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put_bits(&pb, 22, rate_bound);
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put_bits(&pb, 1, 1); /* marker */
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put_bits(&pb, 6, s->audio_bound);
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put_bits(&pb, 1, 1); /* variable bitrate */
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put_bits(&pb, 1, 1); /* non constrainted bit stream */
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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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put_bits(&pb, 1, 1); /* marker */
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put_bits(&pb, 5, s->video_bound);
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put_bits(&pb, 8, 0xff); /* reserved byte */
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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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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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flush_put_bits(&pb);
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size = pb.buf_ptr - 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 mpeg_mux_init(AVFormatContext *ctx)
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{
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MpegMuxContext *s;
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int bitrate, i, mpa_id, mpv_id, ac3_id;
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AVStream *st;
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StreamInfo *stream;
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s = malloc(sizeof(MpegMuxContext));
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if (!s)
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return -1;
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memset(s, 0, sizeof(MpegMuxContext));
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ctx->priv_data = s;
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s->packet_number = 0;
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/* XXX: hardcoded */
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s->packet_size = 2048;
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/* startcode(4) + length(2) + flags(1) */
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s->packet_data_max_size = s->packet_size - 7;
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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 = 0x80;
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mpv_id = VIDEO_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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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
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stream->id = mpa_id++;
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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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stream->max_buffer_size = 46 * 1024;
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s->video_bound++;
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break;
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}
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}
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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 = 2000;
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for(i=0;i<ctx->nb_streams;i++) {
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st = ctx->streams[i];
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bitrate += st->codec.bit_rate;
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}
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s->mux_rate = (bitrate + (8 * 50) - 1) / (8 * 50);
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/* every 2 seconds */
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s->pack_header_freq = 2 * bitrate / s->packet_size / 8;
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/* every 10 seconds */
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s->system_header_freq = s->pack_header_freq * 5;
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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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stream->buffer_ptr = 0;
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stream->packet_number = 0;
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stream->pts = 0;
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stream->start_pts = -1;
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}
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return 0;
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fail:
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for(i=0;i<ctx->nb_streams;i++) {
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free(ctx->streams[i]->priv_data);
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}
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free(s);
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return -ENOMEM;
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}
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/* flush the packet on stream stream_index */
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static void flush_packet(AVFormatContext *ctx, int stream_index)
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{
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MpegMuxContext *s = ctx->priv_data;
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StreamInfo *stream = ctx->streams[stream_index]->priv_data;
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UINT8 *buf_ptr;
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int size, payload_size, startcode, id, len, stuffing_size, i;
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INT64 timestamp;
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UINT8 buffer[128];
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id = stream->id;
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timestamp = stream->start_pts;
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#if 0
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printf("packet ID=%2x PTS=%0.3f\n",
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id, timestamp / 90000.0);
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#endif
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buf_ptr = buffer;
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if ((s->packet_number % s->pack_header_freq) == 0) {
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/* output pack and systems header if needed */
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size = put_pack_header(ctx, buf_ptr, timestamp);
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buf_ptr += size;
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if ((s->packet_number % s->system_header_freq) == 0) {
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size = put_system_header(ctx, buf_ptr);
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buf_ptr += size;
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}
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}
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size = buf_ptr - buffer;
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put_buffer(&ctx->pb, buffer, size);
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/* packet header */
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payload_size = s->packet_size - (size + 6 + 5);
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if (id < 0xc0) {
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startcode = PRIVATE_STREAM_1;
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payload_size -= 4;
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} else {
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startcode = 0x100 + id;
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}
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stuffing_size = payload_size - stream->buffer_ptr;
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if (stuffing_size < 0)
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stuffing_size = 0;
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put_be32(&ctx->pb, startcode);
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put_be16(&ctx->pb, payload_size + 5);
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/* stuffing */
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for(i=0;i<stuffing_size;i++)
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put_byte(&ctx->pb, 0xff);
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/* presentation time stamp */
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put_byte(&ctx->pb,
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(0x02 << 4) |
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(((timestamp >> 30) & 0x07) << 1) |
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1);
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put_be16(&ctx->pb, (UINT16)((((timestamp >> 15) & 0x7fff) << 1) | 1));
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put_be16(&ctx->pb, (UINT16)((((timestamp) & 0x7fff) << 1) | 1));
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if (startcode == PRIVATE_STREAM_1) {
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put_byte(&ctx->pb, id);
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if (id >= 0x80 && id <= 0xbf) {
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/* XXX: need to check AC3 spec */
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put_byte(&ctx->pb, 1);
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put_byte(&ctx->pb, 0);
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put_byte(&ctx->pb, 2);
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}
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}
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/* output data */
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put_buffer(&ctx->pb, stream->buffer, payload_size - stuffing_size);
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put_flush_packet(&ctx->pb);
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/* preserve remaining data */
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len = stream->buffer_ptr - payload_size;
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if (len < 0)
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len = 0;
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memmove(stream->buffer, stream->buffer + stream->buffer_ptr - len, len);
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stream->buffer_ptr = len;
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s->packet_number++;
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stream->packet_number++;
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stream->start_pts = -1;
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}
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static int mpeg_mux_write_packet(AVFormatContext *ctx,
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int stream_index, UINT8 *buf, int size)
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{
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MpegMuxContext *s = ctx->priv_data;
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AVStream *st = ctx->streams[stream_index];
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StreamInfo *stream = st->priv_data;
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int len;
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while (size > 0) {
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/* set pts */
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if (stream->start_pts == -1)
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stream->start_pts = stream->pts * 90000.0;
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len = s->packet_data_max_size - stream->buffer_ptr;
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if (len > size)
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len = size;
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memcpy(stream->buffer + stream->buffer_ptr, buf, len);
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stream->buffer_ptr += len;
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buf += len;
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size -= len;
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while (stream->buffer_ptr >= s->packet_data_max_size) {
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/* output the packet */
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if (stream->start_pts == -1)
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stream->start_pts = stream->pts * 90000.0;
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flush_packet(ctx, stream_index);
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}
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}
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if (st->codec.codec_type == CODEC_TYPE_AUDIO) {
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stream->pts += (float)st->codec.frame_size / st->codec.sample_rate;
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} else {
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stream->pts += FRAME_RATE_BASE / (float)st->codec.frame_rate;
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}
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return 0;
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}
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static int mpeg_mux_end(AVFormatContext *ctx)
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{
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StreamInfo *stream;
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int i;
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/* flush each packet */
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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->buffer_ptr > 0)
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flush_packet(ctx, i);
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}
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/* write the end header */
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put_be32(&ctx->pb, ISO_11172_END_CODE);
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put_flush_packet(&ctx->pb);
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return 0;
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}
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/*********************************************/
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/* demux code */
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#define MAX_SYNC_SIZE 100000
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typedef struct MpegDemuxContext {
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int header_state;
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int mux_rate; /* 50 byte/s unit */
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} MpegDemuxContext;
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static int find_start_code(ByteIOContext *pb, int *size_ptr,
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UINT32 *header_state)
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{
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unsigned int state, v;
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int val, n;
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state = *header_state;
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n = *size_ptr;
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while (n > 0) {
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if (url_feof(pb))
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break;
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v = get_byte(pb);
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n--;
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if (state == 0x000001) {
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state = ((state << 8) | v) & 0xffffff;
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val = state;
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goto found;
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}
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state = ((state << 8) | v) & 0xffffff;
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}
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val = -1;
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found:
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*header_state = state;
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*size_ptr = n;
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return val;
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}
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static int mpeg_mux_read_header(AVFormatContext *s,
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AVFormatParameters *ap)
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{
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MpegDemuxContext *m;
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int size, startcode, c, rate_bound, audio_bound, video_bound, mux_rate, val;
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int codec_id, n, i, type;
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AVStream *st;
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m = av_mallocz(sizeof(MpegDemuxContext));
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if (!m)
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return -ENOMEM;
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s->priv_data = m;
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/* search first pack header */
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m->header_state = 0xff;
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size = MAX_SYNC_SIZE;
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for(;;) {
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while (size > 0) {
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startcode = find_start_code(&s->pb, &size, &m->header_state);
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if (startcode == PACK_START_CODE)
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goto found;
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}
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return -ENODATA;
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found:
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/* search system header just after pack header */
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/* parse pack header */
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get_byte(&s->pb); /* ts1 */
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get_be16(&s->pb); /* ts2 */
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get_be16(&s->pb); /* ts3 */
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mux_rate = get_byte(&s->pb) << 16;
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mux_rate |= get_byte(&s->pb) << 8;
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mux_rate |= get_byte(&s->pb);
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mux_rate &= (1 << 22) - 1;
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m->mux_rate = mux_rate;
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startcode = find_start_code(&s->pb, &size, &m->header_state);
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if (startcode == SYSTEM_HEADER_START_CODE)
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break;
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}
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size = get_be16(&s->pb);
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rate_bound = get_byte(&s->pb) << 16;
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rate_bound |= get_byte(&s->pb) << 8;
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rate_bound |= get_byte(&s->pb);
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rate_bound = (rate_bound >> 1) & ((1 << 22) - 1);
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audio_bound = get_byte(&s->pb) >> 2;
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video_bound = get_byte(&s->pb) & 0x1f;
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get_byte(&s->pb); /* reserved byte */
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#if 0
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printf("mux_rate=%d kbit/s\n", (m->mux_rate * 50 * 8) / 1000);
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printf("rate_bound=%d\n", rate_bound);
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printf("audio_bound=%d\n", audio_bound);
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printf("video_bound=%d\n", video_bound);
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#endif
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size -= 6;
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s->nb_streams = 0;
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while (size > 0) {
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c = get_byte(&s->pb);
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size--;
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if ((c & 0x80) == 0)
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break;
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val = get_be16(&s->pb);
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size -= 2;
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if (c >= 0xc0 && c <= 0xdf) {
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/* mpeg audio stream */
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type = CODEC_TYPE_AUDIO;
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codec_id = CODEC_ID_MP2;
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n = 1;
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c = c | 0x100;
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} else if (c >= 0xe0 && c <= 0xef) {
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type = CODEC_TYPE_VIDEO;
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codec_id = CODEC_ID_MPEG1VIDEO;
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n = 1;
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c = c | 0x100;
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} else if (c == 0xb8) {
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/* all audio streams */
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/* XXX: hack for DVD: we force AC3, although we do not
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know that this codec will be used */
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type = CODEC_TYPE_AUDIO;
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codec_id = CODEC_ID_AC3;
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n = audio_bound;
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c = 0x80;
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/* c = 0x1c0; */
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} else if (c == 0xb9) {
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/* all video streams */
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type = CODEC_TYPE_VIDEO;
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codec_id = CODEC_ID_MPEG1VIDEO;
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n = video_bound;
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c = 0x1e0;
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} else {
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type = 0;
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codec_id = 0;
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n = 0;
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}
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for(i=0;i<n;i++) {
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st = av_mallocz(sizeof(AVStream));
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if (!st)
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return -ENOMEM;
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s->streams[s->nb_streams++] = st;
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st->id = c + i;
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st->codec.codec_type = type;
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st->codec.codec_id = codec_id;
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}
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}
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return 0;
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}
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static INT64 get_pts(ByteIOContext *pb, int c)
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{
|
|
INT64 pts;
|
|
int val;
|
|
|
|
if (c < 0)
|
|
c = get_byte(pb);
|
|
pts = (INT64)((c >> 1) & 0x07) << 30;
|
|
val = get_be16(pb);
|
|
pts |= (INT64)(val >> 1) << 15;
|
|
val = get_be16(pb);
|
|
pts |= (INT64)(val >> 1);
|
|
return pts;
|
|
}
|
|
|
|
static int mpeg_mux_read_packet(AVFormatContext *s,
|
|
AVPacket *pkt)
|
|
{
|
|
MpegDemuxContext *m = s->priv_data;
|
|
AVStream *st;
|
|
int len, size, startcode, i, c, flags, header_len;
|
|
INT64 pts, dts;
|
|
|
|
/* next start code (should be immediately after */
|
|
redo:
|
|
m->header_state = 0xff;
|
|
size = MAX_SYNC_SIZE;
|
|
startcode = find_start_code(&s->pb, &size, &m->header_state);
|
|
// printf("startcode=%x pos=0x%Lx\n", startcode, url_ftell(&s->pb));
|
|
if (startcode < 0)
|
|
return -EIO;
|
|
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;
|
|
}
|
|
/* find matching stream */
|
|
if (!((startcode >= 0x1c0 && startcode <= 0x1df) ||
|
|
(startcode >= 0x1e0 && startcode <= 0x1ef) ||
|
|
(startcode == 0x1bd)))
|
|
goto redo;
|
|
|
|
len = get_be16(&s->pb);
|
|
pts = 0;
|
|
dts = 0;
|
|
/* stuffing */
|
|
for(;;) {
|
|
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 */
|
|
get_byte(&s->pb);
|
|
c = get_byte(&s->pb);
|
|
len -= 2;
|
|
}
|
|
if ((c & 0xf0) == 0x20) {
|
|
pts = get_pts(&s->pb, c);
|
|
len -= 4;
|
|
dts = pts;
|
|
} else if ((c & 0xf0) == 0x30) {
|
|
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) {
|
|
fprintf(stderr, "Encrypted multiplex not handled\n");
|
|
return -EIO;
|
|
}
|
|
flags = get_byte(&s->pb);
|
|
header_len = get_byte(&s->pb);
|
|
len -= 2;
|
|
if (header_len > len)
|
|
goto redo;
|
|
if ((flags & 0xc0) == 0x40) {
|
|
pts = get_pts(&s->pb, -1);
|
|
dts = pts;
|
|
header_len -= 5;
|
|
len -= 5;
|
|
} if ((flags & 0xc0) == 0xc0) {
|
|
pts = get_pts(&s->pb, -1);
|
|
dts = get_pts(&s->pb, -1);
|
|
header_len -= 10;
|
|
len -= 10;
|
|
}
|
|
len -= header_len;
|
|
while (header_len > 0) {
|
|
get_byte(&s->pb);
|
|
header_len--;
|
|
}
|
|
}
|
|
if (startcode == 0x1bd) {
|
|
startcode = get_byte(&s->pb);
|
|
len--;
|
|
if (startcode >= 0x80 && startcode <= 0xbf) {
|
|
/* audio: skip header */
|
|
get_byte(&s->pb);
|
|
get_byte(&s->pb);
|
|
get_byte(&s->pb);
|
|
len -= 3;
|
|
}
|
|
}
|
|
|
|
/* now find stream */
|
|
for(i=0;i<s->nb_streams;i++) {
|
|
st = s->streams[i];
|
|
if (st->id == startcode)
|
|
goto found;
|
|
}
|
|
/* skip packet */
|
|
url_fskip(&s->pb, len);
|
|
goto redo;
|
|
found:
|
|
av_new_packet(pkt, len);
|
|
get_buffer(&s->pb, pkt->data, pkt->size);
|
|
pkt->pts = pts;
|
|
pkt->stream_index = i;
|
|
return 0;
|
|
}
|
|
|
|
static int mpeg_mux_read_close(AVFormatContext *s)
|
|
{
|
|
MpegDemuxContext *m = s->priv_data;
|
|
free(m);
|
|
return 0;
|
|
}
|
|
|
|
AVFormat mpeg_mux_format = {
|
|
"mpeg",
|
|
"MPEG multiplex format",
|
|
"video/x-mpeg",
|
|
"mpg,mpeg,vob",
|
|
CODEC_ID_MP2,
|
|
CODEC_ID_MPEG1VIDEO,
|
|
mpeg_mux_init,
|
|
mpeg_mux_write_packet,
|
|
mpeg_mux_end,
|
|
|
|
mpeg_mux_read_header,
|
|
mpeg_mux_read_packet,
|
|
mpeg_mux_read_close,
|
|
};
|