| /* |
| * nut muxer |
| * Copyright (c) 2004-2007 Michael Niedermayer |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg 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. |
| * |
| * FFmpeg 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 FFmpeg; 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/tree.h" |
| #include "libavcodec/mpegaudiodata.h" |
| #include "nut.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= ff_mpa_freq_tab[sample_rate_index] >> (lsf + mpeg25); |
| |
| for(bitrate_index=2; bitrate_index<30; bitrate_index++){ |
| frame_size = ff_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 == CODEC_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 1 |
| 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++; |
| } |
| #endif |
| |
| 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; |
| } |
| |
| /** |
| * Gets the length in bytes which is needed to store val as v. |
| */ |
| static int get_length(uint64_t val){ |
| int i=1; |
| |
| while(val>>=7) |
| i++; |
| |
| return i; |
| } |
| |
| static void put_v(ByteIOContext *bc, uint64_t val){ |
| int i= get_length(val); |
| |
| while(--i>0) |
| put_byte(bc, 128 | (val>>(7*i))); |
| |
| put_byte(bc, val&127); |
| } |
| |
| static void put_tt(NUTContext *nut, StreamContext *nus, ByteIOContext *bc, uint64_t val){ |
| val *= nut->time_base_count; |
| val += nus->time_base - nut->time_base; |
| put_v(bc, val); |
| } |
| |
| /** |
| * Stores a string as vb. |
| */ |
| static void put_str(ByteIOContext *bc, const char *string){ |
| int len= strlen(string); |
| |
| put_v(bc, len); |
| put_buffer(bc, string, len); |
| } |
| |
| static void put_s(ByteIOContext *bc, int64_t val){ |
| put_v(bc, 2*FFABS(val) - (val>0)); |
| } |
| |
| #ifdef TRACE |
| static inline void put_v_trace(ByteIOContext *bc, uint64_t v, char *file, char *func, int line){ |
| av_log(NULL, AV_LOG_DEBUG, "put_v %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line); |
| |
| put_v(bc, v); |
| } |
| |
| static inline void put_s_trace(ByteIOContext *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 put_v(bc, v) 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, ByteIOContext *bc, ByteIOContext *dyn_bc, int calculate_checksum, uint64_t startcode){ |
| uint8_t *dyn_buf=NULL; |
| int dyn_size= url_close_dyn_buf(dyn_bc, &dyn_buf); |
| int forw_ptr= dyn_size + 4*calculate_checksum; |
| |
| if(forw_ptr > 4096) |
| init_checksum(bc, ff_crc04C11DB7_update, 0); |
| put_be64(bc, startcode); |
| put_v(bc, forw_ptr); |
| if(forw_ptr > 4096) |
| put_le32(bc, get_checksum(bc)); |
| |
| if(calculate_checksum) |
| init_checksum(bc, ff_crc04C11DB7_update, 0); |
| put_buffer(bc, dyn_buf, dyn_size); |
| if(calculate_checksum) |
| put_le32(bc, get_checksum(bc)); |
| |
| av_free(dyn_buf); |
| } |
| |
| static void write_mainheader(NUTContext *nut, ByteIOContext *bc){ |
| int i, j, tmp_pts, tmp_flags, tmp_stream, tmp_mul, tmp_size, tmp_fields, tmp_head_idx; |
| int64_t tmp_match; |
| |
| put_v(bc, 3); /* version */ |
| put_v(bc, nut->avf->nb_streams); |
| put_v(bc, nut->max_distance); |
| put_v(bc, nut->time_base_count); |
| |
| for(i=0; i<nut->time_base_count; i++){ |
| put_v(bc, nut->time_base[i].num); |
| 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; |
| |
| put_v(bc, tmp_flags); |
| put_v(bc, tmp_fields); |
| if(tmp_fields>0) put_s(bc, tmp_pts); |
| if(tmp_fields>1) put_v(bc, tmp_mul); |
| if(tmp_fields>2) put_v(bc, tmp_stream); |
| if(tmp_fields>3) put_v(bc, tmp_size); |
| if(tmp_fields>4) put_v(bc, 0 /*tmp_res*/); |
| if(tmp_fields>5) put_v(bc, j); |
| if(tmp_fields>6) put_v(bc, tmp_match); |
| if(tmp_fields>7) put_v(bc, tmp_head_idx); |
| } |
| put_v(bc, nut->header_count-1); |
| for(i=1; i<nut->header_count; i++){ |
| put_v(bc, nut->header_len[i]); |
| put_buffer(bc, nut->header[i], nut->header_len[i]); |
| } |
| } |
| |
| static int write_streamheader(NUTContext *nut, ByteIOContext *bc, AVStream *st, int i){ |
| AVCodecContext *codec = st->codec; |
| put_v(bc, i); |
| switch(codec->codec_type){ |
| case CODEC_TYPE_VIDEO: put_v(bc, 0); break; |
| case CODEC_TYPE_AUDIO: put_v(bc, 1); break; |
| case CODEC_TYPE_SUBTITLE: put_v(bc, 2); break; |
| default : put_v(bc, 3); break; |
| } |
| put_v(bc, 4); |
| if (codec->codec_tag){ |
| put_le32(bc, codec->codec_tag); |
| }else |
| return -1; |
| |
| put_v(bc, nut->stream[i].time_base - nut->time_base); |
| put_v(bc, nut->stream[i].msb_pts_shift); |
| put_v(bc, nut->stream[i].max_pts_distance); |
| put_v(bc, codec->has_b_frames); |
| put_byte(bc, 0); /* flags: 0x1 - fixed_fps, 0x2 - index_present */ |
| |
| put_v(bc, codec->extradata_size); |
| put_buffer(bc, codec->extradata, codec->extradata_size); |
| |
| switch(codec->codec_type){ |
| case CODEC_TYPE_AUDIO: |
| put_v(bc, codec->sample_rate); |
| put_v(bc, 1); |
| put_v(bc, codec->channels); |
| break; |
| case CODEC_TYPE_VIDEO: |
| put_v(bc, codec->width); |
| put_v(bc, codec->height); |
| |
| if(st->sample_aspect_ratio.num<=0 || st->sample_aspect_ratio.den<=0){ |
| put_v(bc, 0); |
| put_v(bc, 0); |
| }else{ |
| put_v(bc, st->sample_aspect_ratio.num); |
| put_v(bc, st->sample_aspect_ratio.den); |
| } |
| put_v(bc, 0); /* csp type -- unknown */ |
| break; |
| default: |
| break; |
| } |
| return 0; |
| } |
| |
| static int add_info(ByteIOContext *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, ByteIOContext *bc){ |
| AVFormatContext *s= nut->avf; |
| AVMetadataTag *title, *author, *copyright; |
| 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; |
| |
| title = av_metadata_get(s->metadata, "Title" , NULL, 0); |
| author = av_metadata_get(s->metadata, "Author" , NULL, 0); |
| copyright = av_metadata_get(s->metadata, "Copyright", NULL, 0); |
| |
| if(title ) count+= add_info(dyn_bc, "Title" , title->value); |
| if(author ) count+= add_info(dyn_bc, "Author" , author->value); |
| if(copyright) count+= add_info(dyn_bc, "Copyright", copyright->value); |
| if(!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT)) |
| count+= add_info(dyn_bc, "Encoder" , LIBAVFORMAT_IDENT); |
| |
| 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, 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}, |
| }; |
