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658 lines
18 KiB
658 lines
18 KiB
/* |
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* MPEG1 mux/demux |
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* Copyright (c) 2000, 2001, 2002 Fabrice Bellard. |
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* |
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* This library is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2 of the License, or (at your option) any later version. |
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* |
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* This library is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with this library; if not, write to the Free Software |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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*/ |
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#include "avformat.h" |
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#include "tick.h" |
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|
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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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INT64 pts; |
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Ticker pts_ticker; |
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INT64 start_pts; |
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} StreamInfo; |
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|
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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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|
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#define PACK_START_CODE ((unsigned int)0x000001ba) |
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#define SYSTEM_HEADER_START_CODE ((unsigned int)0x000001bb) |
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#define SEQUENCE_END_CODE ((unsigned int)0x000001b7) |
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#define PACKET_START_CODE_MASK ((unsigned int)0xffffff00) |
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#define PACKET_START_CODE_PREFIX ((unsigned int)0x00000100) |
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#define ISO_11172_END_CODE ((unsigned int)0x000001b9) |
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|
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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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|
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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 pbBufPtr(&pb) - 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 = pbBufPtr(&pb) - pb.buf; |
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/* patch packet size */ |
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buf[4] = (size - 6) >> 8; |
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buf[5] = (size - 6) & 0xff; |
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return size; |
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} |
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static int 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, ac3_id; |
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AVStream *st; |
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StreamInfo *stream; |
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s->packet_number = 0; |
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|
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/* XXX: hardcoded */ |
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if (ctx->flags & AVF_FLAG_VCD) |
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s->packet_size = 2324; /* VCD packet size */ |
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else |
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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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default: |
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av_abort(); |
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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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if (ctx->flags & AVF_FLAG_VCD) |
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/* every packet */ |
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s->pack_header_freq = 1; |
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else |
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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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if (ctx->flags & AVF_FLAG_VCD) |
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/* every 40 packets, this is my invention */ |
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s->system_header_freq = s->pack_header_freq * 40; |
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else |
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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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st = ctx->streams[i]; |
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switch (st->codec.codec_type) { |
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case CODEC_TYPE_AUDIO: |
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ticker_init(&stream->pts_ticker, |
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st->codec.sample_rate, |
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90000 * st->codec.frame_size); |
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break; |
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case CODEC_TYPE_VIDEO: |
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ticker_init(&stream->pts_ticker, |
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st->codec.frame_rate, |
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90000 * FRAME_RATE_BASE); |
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break; |
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default: |
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av_abort(); |
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} |
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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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av_free(ctx->streams[i]->priv_data); |
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} |
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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, int last_pkt) |
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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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int last = last_pkt ? 4 : 0; |
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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 + last); |
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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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if (last_pkt) { |
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put_be32(&ctx->pb, ISO_11172_END_CODE); |
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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, int stream_index, |
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UINT8 *buf, int size, int force_pts) |
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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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|
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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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if (force_pts) |
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stream->pts = force_pts; |
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stream->start_pts = stream->pts; |
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} |
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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; |
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flush_packet(ctx, stream_index, 0); |
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} |
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} |
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stream->pts += ticker_tick(&stream->pts_ticker, 1); |
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//if (st->codec.codec_type == CODEC_TYPE_VIDEO) |
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// fprintf(stderr,"\nVideo PTS: %6lld", stream->pts); |
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//else |
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// fprintf(stderr,"\nAudio PTS: %6lld", stream->pts); |
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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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|
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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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if (i == (ctx->nb_streams - 1)) |
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flush_packet(ctx, i, 1); |
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else |
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flush_packet(ctx, i, 0); |
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} |
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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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static int mpegps_probe(AVProbeData *p) |
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{ |
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int code, c, i; |
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code = 0xff; |
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|
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/* we search the first start code. If it is a packet start code, |
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then we decide it is mpeg ps. We do not send highest value to |
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give a chance to mpegts */ |
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for(i=0;i<p->buf_size;i++) { |
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c = p->buf[i]; |
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code = (code << 8) | c; |
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if ((code & 0xffffff00) == 0x100) { |
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if (code == PACK_START_CODE || |
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code == SYSTEM_HEADER_START_CODE || |
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(code >= 0x1e0 && code <= 0x1ef) || |
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(code >= 0x1c0 && code <= 0x1df) || |
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code == PRIVATE_STREAM_2 || |
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code == PROGRAM_STREAM_MAP || |
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code == PRIVATE_STREAM_1 || |
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code == PADDING_STREAM) |
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return AVPROBE_SCORE_MAX - 1; |
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else |
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return 0; |
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} |
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} |
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return 0; |
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} |
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typedef struct MpegDemuxContext { |
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int header_state; |
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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 mpegps_read_header(AVFormatContext *s, |
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AVFormatParameters *ap) |
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{ |
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MpegDemuxContext *m = s->priv_data; |
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m->header_state = 0xff; |
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/* no need to do more */ |
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return 0; |
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} |
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static INT64 get_pts(ByteIOContext *pb, int c) |
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{ |
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INT64 pts; |
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int val; |
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|
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if (c < 0) |
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c = get_byte(pb); |
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pts = (INT64)((c >> 1) & 0x07) << 30; |
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val = get_be16(pb); |
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pts |= (INT64)(val >> 1) << 15; |
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val = get_be16(pb); |
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pts |= (INT64)(val >> 1); |
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return pts; |
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} |
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|
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static int mpegps_read_packet(AVFormatContext *s, |
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AVPacket *pkt) |
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{ |
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MpegDemuxContext *m = s->priv_data; |
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AVStream *st; |
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int len, size, startcode, i, c, flags, header_len, type, codec_id; |
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INT64 pts, dts; |
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|
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/* next start code (should be immediately after */ |
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redo: |
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m->header_state = 0xff; |
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size = MAX_SYNC_SIZE; |
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startcode = find_start_code(&s->pb, &size, &m->header_state); |
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//printf("startcode=%x pos=0x%Lx\n", startcode, url_ftell(&s->pb)); |
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if (startcode < 0) |
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return -EIO; |
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if (startcode == PACK_START_CODE) |
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goto redo; |
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if (startcode == SYSTEM_HEADER_START_CODE) |
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goto redo; |
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if (startcode == PADDING_STREAM || |
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startcode == PRIVATE_STREAM_2) { |
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/* skip them */ |
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len = get_be16(&s->pb); |
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url_fskip(&s->pb, len); |
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goto redo; |
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} |
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/* find matching stream */ |
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if (!((startcode >= 0x1c0 && startcode <= 0x1df) || |
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(startcode >= 0x1e0 && startcode <= 0x1ef) || |
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(startcode == 0x1bd))) |
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goto redo; |
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|
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len = get_be16(&s->pb); |
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pts = 0; |
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dts = 0; |
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/* stuffing */ |
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for(;;) { |
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c = get_byte(&s->pb); |
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len--; |
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/* XXX: for mpeg1, should test only bit 7 */ |
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if (c != 0xff) |
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break; |
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} |
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if ((c & 0xc0) == 0x40) { |
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/* buffer scale & size */ |
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get_byte(&s->pb); |
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c = get_byte(&s->pb); |
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len -= 2; |
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} |
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if ((c & 0xf0) == 0x20) { |
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pts = get_pts(&s->pb, c); |
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len -= 4; |
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dts = pts; |
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} else if ((c & 0xf0) == 0x30) { |
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pts = get_pts(&s->pb, c); |
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dts = get_pts(&s->pb, -1); |
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len -= 9; |
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} else if ((c & 0xc0) == 0x80) { |
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/* mpeg 2 PES */ |
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if ((c & 0x30) != 0) { |
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fprintf(stderr, "Encrypted multiplex not handled\n"); |
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return -EIO; |
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} |
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flags = get_byte(&s->pb); |
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header_len = get_byte(&s->pb); |
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len -= 2; |
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if (header_len > len) |
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goto redo; |
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if ((flags & 0xc0) == 0x40) { |
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pts = get_pts(&s->pb, -1); |
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dts = pts; |
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header_len -= 5; |
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len -= 5; |
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} if ((flags & 0xc0) == 0xc0) { |
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pts = get_pts(&s->pb, -1); |
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dts = get_pts(&s->pb, -1); |
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header_len -= 10; |
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len -= 10; |
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} |
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len -= header_len; |
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while (header_len > 0) { |
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get_byte(&s->pb); |
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header_len--; |
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} |
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} |
|
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; |
|
} |
|
/* no stream found: add a new stream */ |
|
st = av_new_stream(s, startcode); |
|
if (!st) |
|
goto skip; |
|
if (startcode >= 0x1e0 && startcode <= 0x1ef) { |
|
type = CODEC_TYPE_VIDEO; |
|
codec_id = CODEC_ID_MPEG1VIDEO; |
|
} else if (startcode >= 0x1c0 && startcode <= 0x1df) { |
|
type = CODEC_TYPE_AUDIO; |
|
codec_id = CODEC_ID_MP2; |
|
} else if (startcode >= 0x80 && startcode <= 0x9f) { |
|
type = CODEC_TYPE_AUDIO; |
|
codec_id = CODEC_ID_AC3; |
|
} else { |
|
skip: |
|
/* skip packet */ |
|
url_fskip(&s->pb, len); |
|
goto redo; |
|
} |
|
st->codec.codec_type = type; |
|
st->codec.codec_id = codec_id; |
|
found: |
|
av_new_packet(pkt, len); |
|
//printf("\nRead Packet ID: %x PTS: %f Size: %d", startcode, |
|
// (float)pts/90000, len); |
|
get_buffer(&s->pb, pkt->data, pkt->size); |
|
pkt->pts = pts; |
|
pkt->stream_index = st->index; |
|
return 0; |
|
} |
|
|
|
static int mpegps_read_close(AVFormatContext *s) |
|
{ |
|
return 0; |
|
} |
|
|
|
static AVOutputFormat mpegps_mux = { |
|
"mpeg", |
|
"MPEG PS format", |
|
"video/x-mpeg", |
|
"mpg,mpeg,vob", |
|
sizeof(MpegMuxContext), |
|
CODEC_ID_MP2, |
|
CODEC_ID_MPEG1VIDEO, |
|
mpeg_mux_init, |
|
mpeg_mux_write_packet, |
|
mpeg_mux_end, |
|
}; |
|
|
|
static AVInputFormat mpegps_demux = { |
|
"mpeg", |
|
"MPEG PS format", |
|
sizeof(MpegDemuxContext), |
|
mpegps_probe, |
|
mpegps_read_header, |
|
mpegps_read_packet, |
|
mpegps_read_close, |
|
flags: AVFMT_NOHEADER, |
|
}; |
|
|
|
int mpegps_init(void) |
|
{ |
|
av_register_output_format(&mpegps_mux); |
|
av_register_input_format(&mpegps_demux); |
|
return 0; |
|
}
|
|
|