72415b2adb
is deprecated and will be dropped at the next major bump. Originally committed as revision 22735 to svn://svn.ffmpeg.org/ffmpeg/trunk
829 lines
26 KiB
C
829 lines
26 KiB
C
/*
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* nut muxer
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* Copyright (c) 2004-2007 Michael Niedermayer
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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 "libavutil/intreadwrite.h"
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#include "libavutil/tree.h"
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#include "libavcodec/mpegaudiodata.h"
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#include "nut.h"
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static int find_expected_header(AVCodecContext *c, int size, int key_frame, uint8_t out[64]){
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int sample_rate= c->sample_rate;
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if(size>4096)
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return 0;
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AV_WB24(out, 1);
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if(c->codec_id == CODEC_ID_MPEG4){
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if(key_frame){
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return 3;
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}else{
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out[3]= 0xB6;
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return 4;
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}
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}else if(c->codec_id == CODEC_ID_MPEG1VIDEO || c->codec_id == CODEC_ID_MPEG2VIDEO){
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return 3;
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}else if(c->codec_id == CODEC_ID_H264){
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return 3;
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}else if(c->codec_id == CODEC_ID_MP3 || c->codec_id == CODEC_ID_MP2){
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int lsf, mpeg25, sample_rate_index, bitrate_index, frame_size;
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int layer= c->codec_id == CODEC_ID_MP3 ? 3 : 2;
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unsigned int header= 0xFFF00000;
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lsf = sample_rate < (24000+32000)/2;
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mpeg25 = sample_rate < (12000+16000)/2;
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sample_rate <<= lsf + mpeg25;
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if (sample_rate < (32000 + 44100)/2) sample_rate_index=2;
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else if(sample_rate < (44100 + 48000)/2) sample_rate_index=0;
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else sample_rate_index=1;
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sample_rate= ff_mpa_freq_tab[sample_rate_index] >> (lsf + mpeg25);
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for(bitrate_index=2; bitrate_index<30; bitrate_index++){
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frame_size = ff_mpa_bitrate_tab[lsf][layer-1][bitrate_index>>1];
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frame_size = (frame_size * 144000) / (sample_rate << lsf) + (bitrate_index&1);
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if(frame_size == size)
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break;
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}
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header |= (!lsf)<<19;
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header |= (4-layer)<<17;
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header |= 1<<16; //no crc
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AV_WB32(out, header);
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if(size <= 0)
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return 2; //we guess there is no crc, if there is one the user clearly does not care about overhead
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if(bitrate_index == 30)
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return -1; //something is wrong ...
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header |= (bitrate_index>>1)<<12;
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header |= sample_rate_index<<10;
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header |= (bitrate_index&1)<<9;
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return 2; //FIXME actually put the needed ones in build_elision_headers()
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return 3; //we guess that the private bit is not set
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//FIXME the above assumptions should be checked, if these turn out false too often something should be done
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}
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return 0;
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}
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static int find_header_idx(AVFormatContext *s, AVCodecContext *c, int size, int frame_type){
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NUTContext *nut = s->priv_data;
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uint8_t out[64];
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int i;
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int len= find_expected_header(c, size, frame_type, out);
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//av_log(NULL, AV_LOG_ERROR, "expected_h len=%d size=%d codec_id=%d\n", len, size, c->codec_id);
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for(i=1; i<nut->header_count; i++){
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if( len == nut->header_len[i]
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&& !memcmp(out, nut->header[i], len)){
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// av_log(NULL, AV_LOG_ERROR, "found %d\n", i);
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return i;
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}
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}
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// av_log(NULL, AV_LOG_ERROR, "nothing found\n");
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return 0;
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}
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static void build_elision_headers(AVFormatContext *s){
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NUTContext *nut = s->priv_data;
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int i;
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//FIXME this is lame
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//FIXME write a 2pass mode to find the maximal headers
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static const uint8_t headers[][5]={
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{3, 0x00, 0x00, 0x01},
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{4, 0x00, 0x00, 0x01, 0xB6},
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{2, 0xFF, 0xFA}, //mp3+crc
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{2, 0xFF, 0xFB}, //mp3
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{2, 0xFF, 0xFC}, //mp2+crc
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{2, 0xFF, 0xFD}, //mp2
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};
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nut->header_count= 7;
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for(i=1; i<nut->header_count; i++){
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nut->header_len[i]= headers[i-1][0];
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nut->header [i]= &headers[i-1][1];
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}
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}
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static void build_frame_code(AVFormatContext *s){
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NUTContext *nut = s->priv_data;
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int key_frame, index, pred, stream_id;
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int start=1;
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int end= 254;
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int keyframe_0_esc= s->nb_streams > 2;
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int pred_table[10];
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FrameCode *ft;
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ft= &nut->frame_code[start];
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ft->flags= FLAG_CODED;
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ft->size_mul=1;
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ft->pts_delta=1;
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start++;
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if(keyframe_0_esc){
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/* keyframe = 0 escape */
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FrameCode *ft= &nut->frame_code[start];
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ft->flags= FLAG_STREAM_ID | FLAG_SIZE_MSB | FLAG_CODED_PTS;
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ft->size_mul=1;
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start++;
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}
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for(stream_id= 0; stream_id<s->nb_streams; stream_id++){
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int start2= start + (end-start)*stream_id / s->nb_streams;
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int end2 = start + (end-start)*(stream_id+1) / s->nb_streams;
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AVCodecContext *codec = s->streams[stream_id]->codec;
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int is_audio= codec->codec_type == AVMEDIA_TYPE_AUDIO;
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int intra_only= /*codec->intra_only || */is_audio;
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int pred_count;
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for(key_frame=0; key_frame<2; key_frame++){
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if(intra_only && keyframe_0_esc && key_frame==0)
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continue;
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{
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FrameCode *ft= &nut->frame_code[start2];
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ft->flags= FLAG_KEY*key_frame;
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ft->flags|= FLAG_SIZE_MSB | FLAG_CODED_PTS;
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ft->stream_id= stream_id;
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ft->size_mul=1;
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if(is_audio)
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ft->header_idx= find_header_idx(s, codec, -1, key_frame);
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start2++;
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}
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}
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key_frame= intra_only;
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#if 1
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if(is_audio){
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int frame_bytes= codec->frame_size*(int64_t)codec->bit_rate / (8*codec->sample_rate);
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int pts;
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for(pts=0; pts<2; pts++){
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for(pred=0; pred<2; pred++){
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FrameCode *ft= &nut->frame_code[start2];
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ft->flags= FLAG_KEY*key_frame;
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ft->stream_id= stream_id;
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ft->size_mul=frame_bytes + 2;
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ft->size_lsb=frame_bytes + pred;
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ft->pts_delta=pts;
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ft->header_idx= find_header_idx(s, codec, frame_bytes + pred, key_frame);
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start2++;
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}
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}
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}else{
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FrameCode *ft= &nut->frame_code[start2];
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ft->flags= FLAG_KEY | FLAG_SIZE_MSB;
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ft->stream_id= stream_id;
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ft->size_mul=1;
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ft->pts_delta=1;
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start2++;
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}
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#endif
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if(codec->has_b_frames){
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pred_count=5;
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pred_table[0]=-2;
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pred_table[1]=-1;
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pred_table[2]=1;
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pred_table[3]=3;
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pred_table[4]=4;
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}else if(codec->codec_id == CODEC_ID_VORBIS){
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pred_count=3;
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pred_table[0]=2;
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pred_table[1]=9;
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pred_table[2]=16;
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}else{
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pred_count=1;
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pred_table[0]=1;
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}
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for(pred=0; pred<pred_count; pred++){
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int start3= start2 + (end2-start2)*pred / pred_count;
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int end3 = start2 + (end2-start2)*(pred+1) / pred_count;
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for(index=start3; index<end3; index++){
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FrameCode *ft= &nut->frame_code[index];
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ft->flags= FLAG_KEY*key_frame;
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ft->flags|= FLAG_SIZE_MSB;
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ft->stream_id= stream_id;
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//FIXME use single byte size and pred from last
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ft->size_mul= end3-start3;
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ft->size_lsb= index - start3;
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ft->pts_delta= pred_table[pred];
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if(is_audio)
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ft->header_idx= find_header_idx(s, codec, -1, key_frame);
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}
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}
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}
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memmove(&nut->frame_code['N'+1], &nut->frame_code['N'], sizeof(FrameCode)*(255-'N'));
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nut->frame_code[ 0].flags=
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nut->frame_code[255].flags=
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nut->frame_code['N'].flags= FLAG_INVALID;
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}
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/**
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* Gets the length in bytes which is needed to store val as v.
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*/
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static int get_length(uint64_t val){
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int i=1;
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while(val>>=7)
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i++;
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return i;
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}
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static void put_v(ByteIOContext *bc, uint64_t val){
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int i= get_length(val);
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while(--i>0)
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put_byte(bc, 128 | (val>>(7*i)));
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put_byte(bc, val&127);
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}
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static void put_tt(NUTContext *nut, StreamContext *nus, ByteIOContext *bc, uint64_t val){
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val *= nut->time_base_count;
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val += nus->time_base - nut->time_base;
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put_v(bc, val);
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}
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/**
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* Stores a string as vb.
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*/
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static void put_str(ByteIOContext *bc, const char *string){
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int len= strlen(string);
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put_v(bc, len);
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put_buffer(bc, string, len);
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}
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static void put_s(ByteIOContext *bc, int64_t val){
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put_v(bc, 2*FFABS(val) - (val>0));
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}
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#ifdef TRACE
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static inline void put_v_trace(ByteIOContext *bc, uint64_t v, char *file, char *func, int line){
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av_log(NULL, AV_LOG_DEBUG, "put_v %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line);
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put_v(bc, v);
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}
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static inline void put_s_trace(ByteIOContext *bc, int64_t v, char *file, char *func, int line){
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av_log(NULL, AV_LOG_DEBUG, "put_s %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line);
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put_s(bc, v);
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}
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#define put_v(bc, v) put_v_trace(bc, v, __FILE__, __PRETTY_FUNCTION__, __LINE__)
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#define put_s(bc, v) put_s_trace(bc, v, __FILE__, __PRETTY_FUNCTION__, __LINE__)
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#endif
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//FIXME remove calculate_checksum
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static void put_packet(NUTContext *nut, ByteIOContext *bc, ByteIOContext *dyn_bc, int calculate_checksum, uint64_t startcode){
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uint8_t *dyn_buf=NULL;
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int dyn_size= url_close_dyn_buf(dyn_bc, &dyn_buf);
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int forw_ptr= dyn_size + 4*calculate_checksum;
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if(forw_ptr > 4096)
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init_checksum(bc, ff_crc04C11DB7_update, 0);
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put_be64(bc, startcode);
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put_v(bc, forw_ptr);
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if(forw_ptr > 4096)
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put_le32(bc, get_checksum(bc));
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if(calculate_checksum)
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init_checksum(bc, ff_crc04C11DB7_update, 0);
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put_buffer(bc, dyn_buf, dyn_size);
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if(calculate_checksum)
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put_le32(bc, get_checksum(bc));
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av_free(dyn_buf);
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}
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static void write_mainheader(NUTContext *nut, ByteIOContext *bc){
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int i, j, tmp_pts, tmp_flags, tmp_stream, tmp_mul, tmp_size, tmp_fields, tmp_head_idx;
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int64_t tmp_match;
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put_v(bc, 3); /* version */
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put_v(bc, nut->avf->nb_streams);
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put_v(bc, nut->max_distance);
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put_v(bc, nut->time_base_count);
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for(i=0; i<nut->time_base_count; i++){
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put_v(bc, nut->time_base[i].num);
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put_v(bc, nut->time_base[i].den);
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}
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tmp_pts=0;
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tmp_mul=1;
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tmp_stream=0;
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tmp_match= 1-(1LL<<62);
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tmp_head_idx= 0;
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for(i=0; i<256;){
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tmp_fields=0;
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tmp_size=0;
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// tmp_res=0;
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if(tmp_pts != nut->frame_code[i].pts_delta) tmp_fields=1;
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if(tmp_mul != nut->frame_code[i].size_mul ) tmp_fields=2;
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if(tmp_stream != nut->frame_code[i].stream_id) tmp_fields=3;
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if(tmp_size != nut->frame_code[i].size_lsb ) tmp_fields=4;
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// if(tmp_res != nut->frame_code[i].res ) tmp_fields=5;
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if(tmp_head_idx!=nut->frame_code[i].header_idx)tmp_fields=8;
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tmp_pts = nut->frame_code[i].pts_delta;
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tmp_flags = nut->frame_code[i].flags;
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tmp_stream= nut->frame_code[i].stream_id;
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tmp_mul = nut->frame_code[i].size_mul;
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tmp_size = nut->frame_code[i].size_lsb;
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// tmp_res = nut->frame_code[i].res;
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tmp_head_idx= nut->frame_code[i].header_idx;
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for(j=0; i<256; j++,i++){
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if(i == 'N'){
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j--;
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continue;
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}
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if(nut->frame_code[i].pts_delta != tmp_pts ) break;
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if(nut->frame_code[i].flags != tmp_flags ) break;
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if(nut->frame_code[i].stream_id != tmp_stream) break;
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if(nut->frame_code[i].size_mul != tmp_mul ) break;
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if(nut->frame_code[i].size_lsb != tmp_size+j) break;
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// if(nut->frame_code[i].res != tmp_res ) break;
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if(nut->frame_code[i].header_idx!= tmp_head_idx) break;
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}
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if(j != tmp_mul - tmp_size) tmp_fields=6;
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put_v(bc, tmp_flags);
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put_v(bc, tmp_fields);
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if(tmp_fields>0) put_s(bc, tmp_pts);
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if(tmp_fields>1) put_v(bc, tmp_mul);
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if(tmp_fields>2) put_v(bc, tmp_stream);
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if(tmp_fields>3) put_v(bc, tmp_size);
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if(tmp_fields>4) put_v(bc, 0 /*tmp_res*/);
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if(tmp_fields>5) put_v(bc, j);
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if(tmp_fields>6) put_v(bc, tmp_match);
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if(tmp_fields>7) put_v(bc, tmp_head_idx);
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}
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put_v(bc, nut->header_count-1);
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for(i=1; i<nut->header_count; i++){
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put_v(bc, nut->header_len[i]);
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put_buffer(bc, nut->header[i], nut->header_len[i]);
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}
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}
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static int write_streamheader(NUTContext *nut, ByteIOContext *bc, AVStream *st, int i){
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AVCodecContext *codec = st->codec;
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put_v(bc, i);
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switch(codec->codec_type){
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case AVMEDIA_TYPE_VIDEO: put_v(bc, 0); break;
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case AVMEDIA_TYPE_AUDIO: put_v(bc, 1); break;
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case AVMEDIA_TYPE_SUBTITLE: put_v(bc, 2); break;
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default : put_v(bc, 3); break;
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}
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put_v(bc, 4);
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if (codec->codec_tag){
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put_le32(bc, codec->codec_tag);
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}else
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return -1;
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put_v(bc, nut->stream[i].time_base - nut->time_base);
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put_v(bc, nut->stream[i].msb_pts_shift);
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put_v(bc, nut->stream[i].max_pts_distance);
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put_v(bc, codec->has_b_frames);
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put_byte(bc, 0); /* flags: 0x1 - fixed_fps, 0x2 - index_present */
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put_v(bc, codec->extradata_size);
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put_buffer(bc, codec->extradata, codec->extradata_size);
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switch(codec->codec_type){
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case AVMEDIA_TYPE_AUDIO:
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put_v(bc, codec->sample_rate);
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put_v(bc, 1);
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put_v(bc, codec->channels);
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break;
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case AVMEDIA_TYPE_VIDEO:
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put_v(bc, codec->width);
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put_v(bc, codec->height);
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if(st->sample_aspect_ratio.num<=0 || st->sample_aspect_ratio.den<=0){
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put_v(bc, 0);
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put_v(bc, 0);
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}else{
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put_v(bc, st->sample_aspect_ratio.num);
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put_v(bc, st->sample_aspect_ratio.den);
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}
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put_v(bc, 0); /* csp type -- unknown */
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break;
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default:
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break;
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}
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return 0;
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}
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static int add_info(ByteIOContext *bc, const char *type, const char *value){
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put_str(bc, type);
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put_s(bc, -1);
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put_str(bc, value);
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return 1;
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}
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static int write_globalinfo(NUTContext *nut, ByteIOContext *bc){
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|
AVFormatContext *s= nut->avf;
|
|
AVMetadataTag *t = NULL;
|
|
ByteIOContext *dyn_bc;
|
|
uint8_t *dyn_buf=NULL;
|
|
int count=0, dyn_size;
|
|
int ret = url_open_dyn_buf(&dyn_bc);
|
|
if(ret < 0)
|
|
return ret;
|
|
|
|
while ((t = av_metadata_get(s->metadata, "", t, AV_METADATA_IGNORE_SUFFIX)))
|
|
count += add_info(dyn_bc, t->key, t->value);
|
|
|
|
put_v(bc, 0); //stream_if_plus1
|
|
put_v(bc, 0); //chapter_id
|
|
put_v(bc, 0); //timestamp_start
|
|
put_v(bc, 0); //length
|
|
|
|
put_v(bc, count);
|
|
|
|
dyn_size= url_close_dyn_buf(dyn_bc, &dyn_buf);
|
|
put_buffer(bc, dyn_buf, dyn_size);
|
|
av_free(dyn_buf);
|
|
return 0;
|
|
}
|
|
|
|
static int write_streaminfo(NUTContext *nut, ByteIOContext *bc, int stream_id){
|
|
AVFormatContext *s= nut->avf;
|
|
AVStream* st = s->streams[stream_id];
|
|
ByteIOContext *dyn_bc;
|
|
uint8_t *dyn_buf=NULL;
|
|
int count=0, dyn_size, i;
|
|
int ret = url_open_dyn_buf(&dyn_bc);
|
|
if(ret < 0)
|
|
return ret;
|
|
|
|
for (i=0; ff_nut_dispositions[i].flag; ++i) {
|
|
if (st->disposition & ff_nut_dispositions[i].flag)
|
|
count += add_info(dyn_bc, "Disposition", ff_nut_dispositions[i].str);
|
|
}
|
|
dyn_size = url_close_dyn_buf(dyn_bc, &dyn_buf);
|
|
|
|
if (count) {
|
|
put_v(bc, stream_id + 1); //stream_id_plus1
|
|
put_v(bc, 0); //chapter_id
|
|
put_v(bc, 0); //timestamp_start
|
|
put_v(bc, 0); //length
|
|
|
|
put_v(bc, count);
|
|
|
|
put_buffer(bc, dyn_buf, dyn_size);
|
|
}
|
|
|
|
av_free(dyn_buf);
|
|
return count;
|
|
}
|
|
|
|
static int write_headers(NUTContext *nut, ByteIOContext *bc){
|
|
ByteIOContext *dyn_bc;
|
|
int i, ret;
|
|
|
|
ret = url_open_dyn_buf(&dyn_bc);
|
|
if(ret < 0)
|
|
return ret;
|
|
write_mainheader(nut, dyn_bc);
|
|
put_packet(nut, bc, dyn_bc, 1, MAIN_STARTCODE);
|
|
|
|
for (i=0; i < nut->avf->nb_streams; i++){
|
|
ret = url_open_dyn_buf(&dyn_bc);
|
|
if(ret < 0)
|
|
return ret;
|
|
write_streamheader(nut, dyn_bc, nut->avf->streams[i], i);
|
|
put_packet(nut, bc, dyn_bc, 1, STREAM_STARTCODE);
|
|
}
|
|
|
|
ret = url_open_dyn_buf(&dyn_bc);
|
|
if(ret < 0)
|
|
return ret;
|
|
write_globalinfo(nut, dyn_bc);
|
|
put_packet(nut, bc, dyn_bc, 1, INFO_STARTCODE);
|
|
|
|
for (i = 0; i < nut->avf->nb_streams; i++) {
|
|
ret = url_open_dyn_buf(&dyn_bc);
|
|
if(ret < 0)
|
|
return ret;
|
|
ret = write_streaminfo(nut, dyn_bc, i);
|
|
if (ret < 0)
|
|
return ret;
|
|
if (ret > 0)
|
|
put_packet(nut, bc, dyn_bc, 1, INFO_STARTCODE);
|
|
else {
|
|
uint8_t* buf;
|
|
url_close_dyn_buf(dyn_bc, &buf);
|
|
av_free(buf);
|
|
}
|
|
}
|
|
|
|
nut->last_syncpoint_pos= INT_MIN;
|
|
nut->header_count++;
|
|
return 0;
|
|
}
|
|
|
|
static int write_header(AVFormatContext *s){
|
|
NUTContext *nut = s->priv_data;
|
|
ByteIOContext *bc = s->pb;
|
|
int i, j;
|
|
|
|
nut->avf= s;
|
|
|
|
nut->stream = av_mallocz(sizeof(StreamContext)*s->nb_streams);
|
|
nut->time_base= av_mallocz(sizeof(AVRational )*s->nb_streams);
|
|
|
|
for(i=0; i<s->nb_streams; i++){
|
|
AVStream *st= s->streams[i];
|
|
int ssize;
|
|
AVRational time_base;
|
|
ff_parse_specific_params(st->codec, &time_base.den, &ssize, &time_base.num);
|
|
|
|
av_set_pts_info(st, 64, time_base.num, time_base.den);
|
|
|
|
for(j=0; j<nut->time_base_count; j++){
|
|
if(!memcmp(&time_base, &nut->time_base[j], sizeof(AVRational))){
|
|
break;
|
|
}
|
|
}
|
|
nut->time_base[j]= time_base;
|
|
nut->stream[i].time_base= &nut->time_base[j];
|
|
if(j==nut->time_base_count)
|
|
nut->time_base_count++;
|
|
|
|
if(av_q2d(time_base) >= 0.001)
|
|
nut->stream[i].msb_pts_shift = 7;
|
|
else
|
|
nut->stream[i].msb_pts_shift = 14;
|
|
nut->stream[i].max_pts_distance= FFMAX(1/av_q2d(time_base), 1);
|
|
}
|
|
|
|
nut->max_distance = MAX_DISTANCE;
|
|
build_elision_headers(s);
|
|
build_frame_code(s);
|
|
assert(nut->frame_code['N'].flags == FLAG_INVALID);
|
|
|
|
put_buffer(bc, ID_STRING, strlen(ID_STRING));
|
|
put_byte(bc, 0);
|
|
|
|
write_headers(nut, bc);
|
|
|
|
put_flush_packet(bc);
|
|
|
|
//FIXME index
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int get_needed_flags(NUTContext *nut, StreamContext *nus, FrameCode *fc, AVPacket *pkt){
|
|
int flags= 0;
|
|
|
|
if(pkt->flags & PKT_FLAG_KEY ) flags |= FLAG_KEY;
|
|
if(pkt->stream_index != fc->stream_id ) flags |= FLAG_STREAM_ID;
|
|
if(pkt->size / fc->size_mul ) flags |= FLAG_SIZE_MSB;
|
|
if(pkt->pts - nus->last_pts != fc->pts_delta) flags |= FLAG_CODED_PTS;
|
|
if(pkt->size > 2*nut->max_distance ) flags |= FLAG_CHECKSUM;
|
|
if(FFABS(pkt->pts - nus->last_pts)
|
|
> nus->max_pts_distance) flags |= FLAG_CHECKSUM;
|
|
if( pkt->size < nut->header_len[fc->header_idx]
|
|
|| (pkt->size > 4096 && fc->header_idx)
|
|
|| memcmp(pkt->data, nut->header[fc->header_idx], nut->header_len[fc->header_idx]))
|
|
flags |= FLAG_HEADER_IDX;
|
|
|
|
return flags | (fc->flags & FLAG_CODED);
|
|
}
|
|
|
|
static int find_best_header_idx(NUTContext *nut, AVPacket *pkt){
|
|
int i;
|
|
int best_i = 0;
|
|
int best_len= 0;
|
|
|
|
if(pkt->size > 4096)
|
|
return 0;
|
|
|
|
for(i=1; i<nut->header_count; i++){
|
|
if( pkt->size >= nut->header_len[i]
|
|
&& nut->header_len[i] > best_len
|
|
&& !memcmp(pkt->data, nut->header[i], nut->header_len[i])){
|
|
best_i= i;
|
|
best_len= nut->header_len[i];
|
|
}
|
|
}
|
|
return best_i;
|
|
}
|
|
|
|
static int write_packet(AVFormatContext *s, AVPacket *pkt){
|
|
NUTContext *nut = s->priv_data;
|
|
StreamContext *nus= &nut->stream[pkt->stream_index];
|
|
ByteIOContext *bc = s->pb, *dyn_bc;
|
|
FrameCode *fc;
|
|
int64_t coded_pts;
|
|
int best_length, frame_code, flags, needed_flags, i, header_idx, best_header_idx;
|
|
int key_frame = !!(pkt->flags & PKT_FLAG_KEY);
|
|
int store_sp=0;
|
|
int ret;
|
|
|
|
if(pkt->pts < 0)
|
|
return -1;
|
|
|
|
if(1LL<<(20+3*nut->header_count) <= url_ftell(bc))
|
|
write_headers(nut, bc);
|
|
|
|
if(key_frame && !(nus->last_flags & FLAG_KEY))
|
|
store_sp= 1;
|
|
|
|
if(pkt->size + 30/*FIXME check*/ + url_ftell(bc) >= nut->last_syncpoint_pos + nut->max_distance)
|
|
store_sp= 1;
|
|
|
|
//FIXME: Ensure store_sp is 1 in the first place.
|
|
|
|
if(store_sp){
|
|
Syncpoint *sp, dummy= {.pos= INT64_MAX};
|
|
|
|
ff_nut_reset_ts(nut, *nus->time_base, pkt->dts);
|
|
for(i=0; i<s->nb_streams; i++){
|
|
AVStream *st= s->streams[i];
|
|
int64_t dts_tb = av_rescale_rnd(pkt->dts,
|
|
nus->time_base->num * (int64_t)nut->stream[i].time_base->den,
|
|
nus->time_base->den * (int64_t)nut->stream[i].time_base->num,
|
|
AV_ROUND_DOWN);
|
|
int index= av_index_search_timestamp(st, dts_tb, AVSEEK_FLAG_BACKWARD);
|
|
if(index>=0) dummy.pos= FFMIN(dummy.pos, st->index_entries[index].pos);
|
|
}
|
|
if(dummy.pos == INT64_MAX)
|
|
dummy.pos= 0;
|
|
sp= av_tree_find(nut->syncpoints, &dummy, (void *) ff_nut_sp_pos_cmp,
|
|
NULL);
|
|
|
|
nut->last_syncpoint_pos= url_ftell(bc);
|
|
ret = url_open_dyn_buf(&dyn_bc);
|
|
if(ret < 0)
|
|
return ret;
|
|
put_tt(nut, nus, dyn_bc, pkt->dts);
|
|
put_v(dyn_bc, sp ? (nut->last_syncpoint_pos - sp->pos)>>4 : 0);
|
|
put_packet(nut, bc, dyn_bc, 1, SYNCPOINT_STARTCODE);
|
|
|
|
ff_nut_add_sp(nut, nut->last_syncpoint_pos, 0/*unused*/, pkt->dts);
|
|
}
|
|
assert(nus->last_pts != AV_NOPTS_VALUE);
|
|
|
|
coded_pts = pkt->pts & ((1<<nus->msb_pts_shift)-1);
|
|
if(ff_lsb2full(nus, coded_pts) != pkt->pts)
|
|
coded_pts= pkt->pts + (1<<nus->msb_pts_shift);
|
|
|
|
best_header_idx= find_best_header_idx(nut, pkt);
|
|
|
|
best_length=INT_MAX;
|
|
frame_code= -1;
|
|
for(i=0; i<256; i++){
|
|
int length= 0;
|
|
FrameCode *fc= &nut->frame_code[i];
|
|
int flags= fc->flags;
|
|
|
|
if(flags & FLAG_INVALID)
|
|
continue;
|
|
needed_flags= get_needed_flags(nut, nus, fc, pkt);
|
|
|
|
if(flags & FLAG_CODED){
|
|
length++;
|
|
flags = needed_flags;
|
|
}
|
|
|
|
if((flags & needed_flags) != needed_flags)
|
|
continue;
|
|
|
|
if((flags ^ needed_flags) & FLAG_KEY)
|
|
continue;
|
|
|
|
if(flags & FLAG_STREAM_ID)
|
|
length+= get_length(pkt->stream_index);
|
|
|
|
if(pkt->size % fc->size_mul != fc->size_lsb)
|
|
continue;
|
|
if(flags & FLAG_SIZE_MSB)
|
|
length += get_length(pkt->size / fc->size_mul);
|
|
|
|
if(flags & FLAG_CHECKSUM)
|
|
length+=4;
|
|
|
|
if(flags & FLAG_CODED_PTS)
|
|
length += get_length(coded_pts);
|
|
|
|
if( (flags & FLAG_CODED)
|
|
&& nut->header_len[best_header_idx] > nut->header_len[fc->header_idx]+1){
|
|
flags |= FLAG_HEADER_IDX;
|
|
}
|
|
|
|
if(flags & FLAG_HEADER_IDX){
|
|
length += 1 - nut->header_len[best_header_idx];
|
|
}else{
|
|
length -= nut->header_len[fc->header_idx];
|
|
}
|
|
|
|
length*=4;
|
|
length+= !(flags & FLAG_CODED_PTS);
|
|
length+= !(flags & FLAG_CHECKSUM);
|
|
|
|
if(length < best_length){
|
|
best_length= length;
|
|
frame_code=i;
|
|
}
|
|
}
|
|
assert(frame_code != -1);
|
|
fc= &nut->frame_code[frame_code];
|
|
flags= fc->flags;
|
|
needed_flags= get_needed_flags(nut, nus, fc, pkt);
|
|
header_idx= fc->header_idx;
|
|
|
|
init_checksum(bc, ff_crc04C11DB7_update, 0);
|
|
put_byte(bc, frame_code);
|
|
if(flags & FLAG_CODED){
|
|
put_v(bc, (flags^needed_flags) & ~(FLAG_CODED));
|
|
flags = needed_flags;
|
|
}
|
|
if(flags & FLAG_STREAM_ID) put_v(bc, pkt->stream_index);
|
|
if(flags & FLAG_CODED_PTS) put_v(bc, coded_pts);
|
|
if(flags & FLAG_SIZE_MSB) put_v(bc, pkt->size / fc->size_mul);
|
|
if(flags & FLAG_HEADER_IDX) put_v(bc, header_idx= best_header_idx);
|
|
|
|
if(flags & FLAG_CHECKSUM) put_le32(bc, get_checksum(bc));
|
|
else get_checksum(bc);
|
|
|
|
put_buffer(bc, pkt->data + nut->header_len[header_idx], pkt->size - nut->header_len[header_idx]);
|
|
nus->last_flags= flags;
|
|
nus->last_pts= pkt->pts;
|
|
|
|
//FIXME just store one per syncpoint
|
|
if(flags & FLAG_KEY)
|
|
av_add_index_entry(
|
|
s->streams[pkt->stream_index],
|
|
nut->last_syncpoint_pos,
|
|
pkt->pts,
|
|
0,
|
|
0,
|
|
AVINDEX_KEYFRAME);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int write_trailer(AVFormatContext *s){
|
|
NUTContext *nut= s->priv_data;
|
|
ByteIOContext *bc= s->pb;
|
|
|
|
while(nut->header_count<3)
|
|
write_headers(nut, bc);
|
|
put_flush_packet(bc);
|
|
ff_nut_free_sp(nut);
|
|
av_freep(&nut->stream);
|
|
av_freep(&nut->time_base);
|
|
|
|
return 0;
|
|
}
|
|
|
|
AVOutputFormat nut_muxer = {
|
|
"nut",
|
|
NULL_IF_CONFIG_SMALL("NUT format"),
|
|
"video/x-nut",
|
|
"nut",
|
|
sizeof(NUTContext),
|
|
#if CONFIG_LIBVORBIS
|
|
CODEC_ID_VORBIS,
|
|
#elif CONFIG_LIBMP3LAME
|
|
CODEC_ID_MP3,
|
|
#else
|
|
CODEC_ID_MP2,
|
|
#endif
|
|
CODEC_ID_MPEG4,
|
|
write_header,
|
|
write_packet,
|
|
write_trailer,
|
|
.flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS,
|
|
.codec_tag= (const AVCodecTag* const []){ff_codec_bmp_tags, ff_codec_wav_tags, ff_nut_subtitle_tags, 0},
|
|
.metadata_conv = ff_nut_metadata_conv,
|
|
};
|