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825 lines
26 KiB
825 lines
26 KiB
/* |
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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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|
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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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|
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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 == CODEC_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 CODEC_TYPE_VIDEO: put_v(bc, 0); break; |
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case CODEC_TYPE_AUDIO: put_v(bc, 1); break; |
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case CODEC_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 CODEC_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 CODEC_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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|
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static int write_globalinfo(NUTContext *nut, ByteIOContext *bc){ |
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AVFormatContext *s= nut->avf; |
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ByteIOContext *dyn_bc; |
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uint8_t *dyn_buf=NULL; |
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int count=0, dyn_size; |
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int ret = url_open_dyn_buf(&dyn_bc); |
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if(ret < 0) |
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return ret; |
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if(s->title [0]) count+= add_info(dyn_bc, "Title" , s->title); |
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if(s->author [0]) count+= add_info(dyn_bc, "Author" , s->author); |
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if(s->copyright[0]) count+= add_info(dyn_bc, "Copyright", s->copyright); |
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if(!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT)) |
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count+= add_info(dyn_bc, "Encoder" , LIBAVFORMAT_IDENT); |
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put_v(bc, 0); //stream_if_plus1 |
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put_v(bc, 0); //chapter_id |
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put_v(bc, 0); //timestamp_start |
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put_v(bc, 0); //length |
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|
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put_v(bc, count); |
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dyn_size= url_close_dyn_buf(dyn_bc, &dyn_buf); |
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put_buffer(bc, dyn_buf, dyn_size); |
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av_free(dyn_buf); |
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return 0; |
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} |
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|
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static int write_streaminfo(NUTContext *nut, ByteIOContext *bc, int stream_id){ |
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AVFormatContext *s= nut->avf; |
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AVStream* st = s->streams[stream_id]; |
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ByteIOContext *dyn_bc; |
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uint8_t *dyn_buf=NULL; |
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int count=0, dyn_size, i; |
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int ret = url_open_dyn_buf(&dyn_bc); |
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if(ret < 0) |
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return ret; |
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|
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for (i=0; ff_nut_dispositions[i].flag; ++i) { |
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if (st->disposition & ff_nut_dispositions[i].flag) |
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count += add_info(dyn_bc, "Disposition", ff_nut_dispositions[i].str); |
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} |
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dyn_size = url_close_dyn_buf(dyn_bc, &dyn_buf); |
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|
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if (count) { |
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put_v(bc, stream_id + 1); //stream_id_plus1 |
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put_v(bc, 0); //chapter_id |
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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, 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); |
|
|
|
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 []){codec_bmp_tags, codec_wav_tags, ff_nut_subtitle_tags, 0}, |
|
};
|
|
|