/* * nut muxer * Copyright (c) 2004-2007 Michael Niedermayer * * This file is part of Libav. * * Libav is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * Libav is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with Libav; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include "libavutil/intreadwrite.h" #include "libavutil/mathematics.h" #include "libavutil/tree.h" #include "libavutil/dict.h" #include "libavcodec/mpegaudiodata.h" #include "nut.h" #include "internal.h" #include "avio_internal.h" static int find_expected_header(AVCodecContext *c, int size, int key_frame, uint8_t out[64]){ int sample_rate= c->sample_rate; if(size>4096) return 0; AV_WB24(out, 1); if(c->codec_id == CODEC_ID_MPEG4){ if(key_frame){ return 3; }else{ out[3]= 0xB6; return 4; } }else if(c->codec_id == CODEC_ID_MPEG1VIDEO || c->codec_id == CODEC_ID_MPEG2VIDEO){ return 3; }else if(c->codec_id == CODEC_ID_H264){ return 3; }else if(c->codec_id == CODEC_ID_MP3 || c->codec_id == CODEC_ID_MP2){ int lsf, mpeg25, sample_rate_index, bitrate_index, frame_size; int layer= c->codec_id == CODEC_ID_MP3 ? 3 : 2; unsigned int header= 0xFFF00000; lsf = sample_rate < (24000+32000)/2; mpeg25 = sample_rate < (12000+16000)/2; sample_rate <<= lsf + mpeg25; if (sample_rate < (32000 + 44100)/2) sample_rate_index=2; else if(sample_rate < (44100 + 48000)/2) sample_rate_index=0; else sample_rate_index=1; sample_rate= avpriv_mpa_freq_tab[sample_rate_index] >> (lsf + mpeg25); for(bitrate_index=2; bitrate_index<30; bitrate_index++){ frame_size = avpriv_mpa_bitrate_tab[lsf][layer-1][bitrate_index>>1]; frame_size = (frame_size * 144000) / (sample_rate << lsf) + (bitrate_index&1); if(frame_size == size) break; } header |= (!lsf)<<19; header |= (4-layer)<<17; header |= 1<<16; //no crc AV_WB32(out, header); if(size <= 0) return 2; //we guess there is no crc, if there is one the user clearly does not care about overhead if(bitrate_index == 30) return -1; //something is wrong ... header |= (bitrate_index>>1)<<12; header |= sample_rate_index<<10; header |= (bitrate_index&1)<<9; return 2; //FIXME actually put the needed ones in build_elision_headers() return 3; //we guess that the private bit is not set //FIXME the above assumptions should be checked, if these turn out false too often something should be done } return 0; } static int find_header_idx(AVFormatContext *s, AVCodecContext *c, int size, int frame_type){ NUTContext *nut = s->priv_data; uint8_t out[64]; int i; int len= find_expected_header(c, size, frame_type, out); //av_log(NULL, AV_LOG_ERROR, "expected_h len=%d size=%d codec_id=%d\n", len, size, c->codec_id); for(i=1; i<nut->header_count; i++){ if( len == nut->header_len[i] && !memcmp(out, nut->header[i], len)){ // av_log(NULL, AV_LOG_ERROR, "found %d\n", i); return i; } } // av_log(NULL, AV_LOG_ERROR, "nothing found\n"); return 0; } static void build_elision_headers(AVFormatContext *s){ NUTContext *nut = s->priv_data; int i; //FIXME this is lame //FIXME write a 2pass mode to find the maximal headers static const uint8_t headers[][5]={ {3, 0x00, 0x00, 0x01}, {4, 0x00, 0x00, 0x01, 0xB6}, {2, 0xFF, 0xFA}, //mp3+crc {2, 0xFF, 0xFB}, //mp3 {2, 0xFF, 0xFC}, //mp2+crc {2, 0xFF, 0xFD}, //mp2 }; nut->header_count= 7; for(i=1; i<nut->header_count; i++){ nut->header_len[i]= headers[i-1][0]; nut->header [i]= &headers[i-1][1]; } } static void build_frame_code(AVFormatContext *s){ NUTContext *nut = s->priv_data; int key_frame, index, pred, stream_id; int start=1; int end= 254; int keyframe_0_esc= s->nb_streams > 2; int pred_table[10]; FrameCode *ft; ft= &nut->frame_code[start]; ft->flags= FLAG_CODED; ft->size_mul=1; ft->pts_delta=1; start++; if(keyframe_0_esc){ /* keyframe = 0 escape */ FrameCode *ft= &nut->frame_code[start]; ft->flags= FLAG_STREAM_ID | FLAG_SIZE_MSB | FLAG_CODED_PTS; ft->size_mul=1; start++; } for(stream_id= 0; stream_id<s->nb_streams; stream_id++){ int start2= start + (end-start)*stream_id / s->nb_streams; int end2 = start + (end-start)*(stream_id+1) / s->nb_streams; AVCodecContext *codec = s->streams[stream_id]->codec; int is_audio= codec->codec_type == AVMEDIA_TYPE_AUDIO; int intra_only= /*codec->intra_only || */is_audio; int pred_count; for(key_frame=0; key_frame<2; key_frame++){ if(intra_only && keyframe_0_esc && key_frame==0) continue; { FrameCode *ft= &nut->frame_code[start2]; ft->flags= FLAG_KEY*key_frame; ft->flags|= FLAG_SIZE_MSB | FLAG_CODED_PTS; ft->stream_id= stream_id; ft->size_mul=1; if(is_audio) ft->header_idx= find_header_idx(s, codec, -1, key_frame); start2++; } } key_frame= intra_only; if(is_audio){ int frame_bytes= codec->frame_size*(int64_t)codec->bit_rate / (8*codec->sample_rate); int pts; for(pts=0; pts<2; pts++){ for(pred=0; pred<2; pred++){ FrameCode *ft= &nut->frame_code[start2]; ft->flags= FLAG_KEY*key_frame; ft->stream_id= stream_id; ft->size_mul=frame_bytes + 2; ft->size_lsb=frame_bytes + pred; ft->pts_delta=pts; ft->header_idx= find_header_idx(s, codec, frame_bytes + pred, key_frame); start2++; } } }else{ FrameCode *ft= &nut->frame_code[start2]; ft->flags= FLAG_KEY | FLAG_SIZE_MSB; ft->stream_id= stream_id; ft->size_mul=1; ft->pts_delta=1; start2++; } if(codec->has_b_frames){ pred_count=5; pred_table[0]=-2; pred_table[1]=-1; pred_table[2]=1; pred_table[3]=3; pred_table[4]=4; }else if(codec->codec_id == CODEC_ID_VORBIS){ pred_count=3; pred_table[0]=2; pred_table[1]=9; pred_table[2]=16; }else{ pred_count=1; pred_table[0]=1; } for(pred=0; pred<pred_count; pred++){ int start3= start2 + (end2-start2)*pred / pred_count; int end3 = start2 + (end2-start2)*(pred+1) / pred_count; for(index=start3; index<end3; index++){ FrameCode *ft= &nut->frame_code[index]; ft->flags= FLAG_KEY*key_frame; ft->flags|= FLAG_SIZE_MSB; ft->stream_id= stream_id; //FIXME use single byte size and pred from last ft->size_mul= end3-start3; ft->size_lsb= index - start3; ft->pts_delta= pred_table[pred]; if(is_audio) ft->header_idx= find_header_idx(s, codec, -1, key_frame); } } } memmove(&nut->frame_code['N'+1], &nut->frame_code['N'], sizeof(FrameCode)*(255-'N')); nut->frame_code[ 0].flags= nut->frame_code[255].flags= nut->frame_code['N'].flags= FLAG_INVALID; } static void put_tt(NUTContext *nut, AVRational *time_base, AVIOContext *bc, uint64_t val){ val *= nut->time_base_count; val += time_base - nut->time_base; ff_put_v(bc, val); } /** * Store a string as vb. */ static void put_str(AVIOContext *bc, const char *string){ int len= strlen(string); ff_put_v(bc, len); avio_write(bc, string, len); } static void put_s(AVIOContext *bc, int64_t val){ ff_put_v(bc, 2*FFABS(val) - (val>0)); } #ifdef TRACE static inline void ff_put_v_trace(AVIOContext *bc, uint64_t v, char *file, char *func, int line){ av_log(NULL, AV_LOG_DEBUG, "ff_put_v %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line); ff_put_v(bc, v); } static inline void put_s_trace(AVIOContext *bc, int64_t v, char *file, char *func, int line){ av_log(NULL, AV_LOG_DEBUG, "put_s %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line); put_s(bc, v); } #define ff_put_v(bc, v) ff_put_v_trace(bc, v, __FILE__, __PRETTY_FUNCTION__, __LINE__) #define put_s(bc, v) put_s_trace(bc, v, __FILE__, __PRETTY_FUNCTION__, __LINE__) #endif //FIXME remove calculate_checksum static void put_packet(NUTContext *nut, AVIOContext *bc, AVIOContext *dyn_bc, int calculate_checksum, uint64_t startcode){ uint8_t *dyn_buf=NULL; int dyn_size= avio_close_dyn_buf(dyn_bc, &dyn_buf); int forw_ptr= dyn_size + 4*calculate_checksum; if(forw_ptr > 4096) ffio_init_checksum(bc, ff_crc04C11DB7_update, 0); avio_wb64(bc, startcode); ff_put_v(bc, forw_ptr); if(forw_ptr > 4096) avio_wl32(bc, ffio_get_checksum(bc)); if(calculate_checksum) ffio_init_checksum(bc, ff_crc04C11DB7_update, 0); avio_write(bc, dyn_buf, dyn_size); if(calculate_checksum) avio_wl32(bc, ffio_get_checksum(bc)); av_free(dyn_buf); } static void write_mainheader(NUTContext *nut, AVIOContext *bc){ int i, j, tmp_pts, tmp_flags, tmp_stream, tmp_mul, tmp_size, tmp_fields, tmp_head_idx; int64_t tmp_match; ff_put_v(bc, 3); /* version */ ff_put_v(bc, nut->avf->nb_streams); ff_put_v(bc, nut->max_distance); ff_put_v(bc, nut->time_base_count); for(i=0; i<nut->time_base_count; i++){ ff_put_v(bc, nut->time_base[i].num); ff_put_v(bc, nut->time_base[i].den); } tmp_pts=0; tmp_mul=1; tmp_stream=0; tmp_match= 1-(1LL<<62); tmp_head_idx= 0; for(i=0; i<256;){ tmp_fields=0; tmp_size=0; // tmp_res=0; if(tmp_pts != nut->frame_code[i].pts_delta) tmp_fields=1; if(tmp_mul != nut->frame_code[i].size_mul ) tmp_fields=2; if(tmp_stream != nut->frame_code[i].stream_id) tmp_fields=3; if(tmp_size != nut->frame_code[i].size_lsb ) tmp_fields=4; // if(tmp_res != nut->frame_code[i].res ) tmp_fields=5; if(tmp_head_idx!=nut->frame_code[i].header_idx)tmp_fields=8; tmp_pts = nut->frame_code[i].pts_delta; tmp_flags = nut->frame_code[i].flags; tmp_stream= nut->frame_code[i].stream_id; tmp_mul = nut->frame_code[i].size_mul; tmp_size = nut->frame_code[i].size_lsb; // tmp_res = nut->frame_code[i].res; tmp_head_idx= nut->frame_code[i].header_idx; for(j=0; i<256; j++,i++){ if(i == 'N'){ j--; continue; } if(nut->frame_code[i].pts_delta != tmp_pts ) break; if(nut->frame_code[i].flags != tmp_flags ) break; if(nut->frame_code[i].stream_id != tmp_stream) break; if(nut->frame_code[i].size_mul != tmp_mul ) break; if(nut->frame_code[i].size_lsb != tmp_size+j) break; // if(nut->frame_code[i].res != tmp_res ) break; if(nut->frame_code[i].header_idx!= tmp_head_idx) break; } if(j != tmp_mul - tmp_size) tmp_fields=6; ff_put_v(bc, tmp_flags); ff_put_v(bc, tmp_fields); if(tmp_fields>0) put_s(bc, tmp_pts); if(tmp_fields>1) ff_put_v(bc, tmp_mul); if(tmp_fields>2) ff_put_v(bc, tmp_stream); if(tmp_fields>3) ff_put_v(bc, tmp_size); if(tmp_fields>4) ff_put_v(bc, 0 /*tmp_res*/); if(tmp_fields>5) ff_put_v(bc, j); if(tmp_fields>6) ff_put_v(bc, tmp_match); if(tmp_fields>7) ff_put_v(bc, tmp_head_idx); } ff_put_v(bc, nut->header_count-1); for(i=1; i<nut->header_count; i++){ ff_put_v(bc, nut->header_len[i]); avio_write(bc, nut->header[i], nut->header_len[i]); } } static int write_streamheader(AVFormatContext *avctx, AVIOContext *bc, AVStream *st, int i){ NUTContext *nut = avctx->priv_data; AVCodecContext *codec = st->codec; ff_put_v(bc, i); switch(codec->codec_type){ case AVMEDIA_TYPE_VIDEO: ff_put_v(bc, 0); break; case AVMEDIA_TYPE_AUDIO: ff_put_v(bc, 1); break; case AVMEDIA_TYPE_SUBTITLE: ff_put_v(bc, 2); break; default : ff_put_v(bc, 3); break; } ff_put_v(bc, 4); if (codec->codec_tag){ avio_wl32(bc, codec->codec_tag); } else { av_log(avctx, AV_LOG_ERROR, "No codec tag defined for stream %d\n", i); return AVERROR(EINVAL); } ff_put_v(bc, nut->stream[i].time_base - nut->time_base); ff_put_v(bc, nut->stream[i].msb_pts_shift); ff_put_v(bc, nut->stream[i].max_pts_distance); ff_put_v(bc, codec->has_b_frames); avio_w8(bc, 0); /* flags: 0x1 - fixed_fps, 0x2 - index_present */ ff_put_v(bc, codec->extradata_size); avio_write(bc, codec->extradata, codec->extradata_size); switch(codec->codec_type){ case AVMEDIA_TYPE_AUDIO: ff_put_v(bc, codec->sample_rate); ff_put_v(bc, 1); ff_put_v(bc, codec->channels); break; case AVMEDIA_TYPE_VIDEO: ff_put_v(bc, codec->width); ff_put_v(bc, codec->height); if(st->sample_aspect_ratio.num<=0 || st->sample_aspect_ratio.den<=0){ ff_put_v(bc, 0); ff_put_v(bc, 0); }else{ ff_put_v(bc, st->sample_aspect_ratio.num); ff_put_v(bc, st->sample_aspect_ratio.den); } ff_put_v(bc, 0); /* csp type -- unknown */ break; default: break; } return 0; } static int add_info(AVIOContext *bc, const char *type, const char *value){ put_str(bc, type); put_s(bc, -1); put_str(bc, value); return 1; } static int write_globalinfo(NUTContext *nut, AVIOContext *bc){ AVFormatContext *s= nut->avf; AVDictionaryEntry *t = NULL; AVIOContext *dyn_bc; uint8_t *dyn_buf=NULL; int count=0, dyn_size; int ret = avio_open_dyn_buf(&dyn_bc); if(ret < 0) return ret; while ((t = av_dict_get(s->metadata, "", t, AV_DICT_IGNORE_SUFFIX))) count += add_info(dyn_bc, t->key, t->value); ff_put_v(bc, 0); //stream_if_plus1 ff_put_v(bc, 0); //chapter_id ff_put_v(bc, 0); //timestamp_start ff_put_v(bc, 0); //length ff_put_v(bc, count); dyn_size= avio_close_dyn_buf(dyn_bc, &dyn_buf); avio_write(bc, dyn_buf, dyn_size); av_free(dyn_buf); return 0; } static int write_streaminfo(NUTContext *nut, AVIOContext *bc, int stream_id){ AVFormatContext *s= nut->avf; AVStream* st = s->streams[stream_id]; AVIOContext *dyn_bc; uint8_t *dyn_buf=NULL; int count=0, dyn_size, i; int ret = avio_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 = avio_close_dyn_buf(dyn_bc, &dyn_buf); if (count) { ff_put_v(bc, stream_id + 1); //stream_id_plus1 ff_put_v(bc, 0); //chapter_id ff_put_v(bc, 0); //timestamp_start ff_put_v(bc, 0); //length ff_put_v(bc, count); avio_write(bc, dyn_buf, dyn_size); } av_free(dyn_buf); return count; } static int write_chapter(NUTContext *nut, AVIOContext *bc, int id) { AVIOContext *dyn_bc; uint8_t *dyn_buf = NULL; AVDictionaryEntry *t = NULL; AVChapter *ch = nut->avf->chapters[id]; int ret, dyn_size, count = 0; ret = avio_open_dyn_buf(&dyn_bc); if (ret < 0) return ret; ff_put_v(bc, 0); // stream_id_plus1 put_s(bc, id + 1); // chapter_id put_tt(nut, nut->chapter[id].time_base, bc, ch->start); // chapter_start ff_put_v(bc, ch->end - ch->start); // chapter_len while ((t = av_dict_get(ch->metadata, "", t, AV_DICT_IGNORE_SUFFIX))) count += add_info(dyn_bc, t->key, t->value); ff_put_v(bc, count); dyn_size = avio_close_dyn_buf(dyn_bc, &dyn_buf); avio_write(bc, dyn_buf, dyn_size); av_freep(&dyn_buf); return 0; } static int write_headers(AVFormatContext *avctx, AVIOContext *bc){ NUTContext *nut = avctx->priv_data; AVIOContext *dyn_bc; int i, ret; ff_metadata_conv_ctx(avctx, ff_nut_metadata_conv, NULL); ret = avio_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 = avio_open_dyn_buf(&dyn_bc); if(ret < 0) return ret; if ((ret = write_streamheader(avctx, dyn_bc, nut->avf->streams[i], i)) < 0) return ret; put_packet(nut, bc, dyn_bc, 1, STREAM_STARTCODE); } ret = avio_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 = avio_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; avio_close_dyn_buf(dyn_bc, &buf); av_free(buf); } } for (i = 0; i < nut->avf->nb_chapters; i++) { ret = avio_open_dyn_buf(&dyn_bc); if (ret < 0) return ret; ret = write_chapter(nut, dyn_bc, i); if (ret < 0) { uint8_t *buf; avio_close_dyn_buf(dyn_bc, &buf); av_freep(&buf); return ret; } put_packet(nut, bc, dyn_bc, 1, INFO_STARTCODE); } nut->last_syncpoint_pos= INT_MIN; nut->header_count++; return 0; } static int nut_write_header(AVFormatContext *s){ NUTContext *nut = s->priv_data; AVIOContext *bc = s->pb; int i, j, ret; nut->avf= s; nut->stream = av_mallocz(sizeof(StreamContext)*s->nb_streams); if (s->nb_chapters) nut->chapter = av_mallocz(sizeof(ChapterContext)*s->nb_chapters); nut->time_base= av_mallocz(sizeof(AVRational )*(s->nb_streams + s->nb_chapters)); if (!nut->stream || (s->nb_chapters && !nut->chapter) || !nut->time_base) { av_freep(&nut->stream); av_freep(&nut->chapter); av_freep(&nut->time_base); return AVERROR(ENOMEM); } 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); avpriv_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(INT64_C(1000) * time_base.num >= time_base.den) nut->stream[i].msb_pts_shift = 7; else nut->stream[i].msb_pts_shift = 14; nut->stream[i].max_pts_distance= FFMAX(time_base.den, time_base.num) / time_base.num; } for (i = 0; i < s->nb_chapters; i++) { AVChapter *ch = s->chapters[i]; for (j = 0; j < nut->time_base_count; j++) { if (!memcmp(&ch->time_base, &nut->time_base[j], sizeof(AVRational))) break; } nut->time_base[j] = ch->time_base; nut->chapter[i].time_base = &nut->time_base[j]; if(j == nut->time_base_count) nut->time_base_count++; } nut->max_distance = MAX_DISTANCE; build_elision_headers(s); build_frame_code(s); assert(nut->frame_code['N'].flags == FLAG_INVALID); avio_write(bc, ID_STRING, strlen(ID_STRING)); avio_w8(bc, 0); if ((ret = write_headers(s, bc)) < 0) return ret; avio_flush(bc); //FIXME index return 0; } static int get_needed_flags(NUTContext *nut, StreamContext *nus, FrameCode *fc, AVPacket *pkt){ int flags= 0; if(pkt->flags & AV_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 nut_write_packet(AVFormatContext *s, AVPacket *pkt){ NUTContext *nut = s->priv_data; StreamContext *nus= &nut->stream[pkt->stream_index]; AVIOContext *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 & AV_PKT_FLAG_KEY); int store_sp=0; int ret; if(pkt->pts < 0) return -1; if(1LL<<(20+3*nut->header_count) <= avio_tell(bc)) write_headers(s, bc); if(key_frame && !(nus->last_flags & FLAG_KEY)) store_sp= 1; if(pkt->size + 30/*FIXME check*/ + avio_tell(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= avio_tell(bc); ret = avio_open_dyn_buf(&dyn_bc); if(ret < 0) return ret; put_tt(nut, nus->time_base, dyn_bc, pkt->dts); ff_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+= ff_get_v_length(pkt->stream_index); if(pkt->size % fc->size_mul != fc->size_lsb) continue; if(flags & FLAG_SIZE_MSB) length += ff_get_v_length(pkt->size / fc->size_mul); if(flags & FLAG_CHECKSUM) length+=4; if(flags & FLAG_CODED_PTS) length += ff_get_v_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; ffio_init_checksum(bc, ff_crc04C11DB7_update, 0); avio_w8(bc, frame_code); if(flags & FLAG_CODED){ ff_put_v(bc, (flags^needed_flags) & ~(FLAG_CODED)); flags = needed_flags; } if(flags & FLAG_STREAM_ID) ff_put_v(bc, pkt->stream_index); if(flags & FLAG_CODED_PTS) ff_put_v(bc, coded_pts); if(flags & FLAG_SIZE_MSB) ff_put_v(bc, pkt->size / fc->size_mul); if(flags & FLAG_HEADER_IDX) ff_put_v(bc, header_idx= best_header_idx); if(flags & FLAG_CHECKSUM) avio_wl32(bc, ffio_get_checksum(bc)); else ffio_get_checksum(bc); avio_write(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 nut_write_trailer(AVFormatContext *s){ NUTContext *nut= s->priv_data; AVIOContext *bc= s->pb; while(nut->header_count<3) write_headers(s, bc); avio_flush(bc); ff_nut_free_sp(nut); av_freep(&nut->stream); av_freep(&nut->chapter); av_freep(&nut->time_base); return 0; } AVOutputFormat ff_nut_muxer = { .name = "nut", .long_name = NULL_IF_CONFIG_SMALL("NUT format"), .mime_type = "video/x-nut", .extensions = "nut", .priv_data_size = sizeof(NUTContext), #if CONFIG_LIBVORBIS .audio_codec = CODEC_ID_VORBIS, #elif CONFIG_LIBMP3LAME .audio_codec = CODEC_ID_MP3, #else .audio_codec = CODEC_ID_MP2, #endif .video_codec = CODEC_ID_MPEG4, .write_header = nut_write_header, .write_packet = nut_write_packet, .write_trailer = nut_write_trailer, .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS, .codec_tag = (const AVCodecTag * const []){ ff_codec_bmp_tags, ff_nut_video_tags, ff_codec_wav_tags, ff_nut_subtitle_tags, 0 }, };