/* * "NUT" Container Format muxer and demuxer (DRAFT-200403??) * Copyright (c) 2003 Alex Beregszaszi * Copyright (c) 2004 Michael Niedermayer * * This library 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 of the License, or (at your option) any later version. * * This library 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 General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * * NUT DRAFT can be found in MPlayer CVS at DOCS/tech/mpcf.txt * * AND http://people.fsn.hu/~alex/nut/ (TeX, pdf, ps, dvi, ..) * */ /* * TODO: * - index writing * - index packet reading support */ //#define DEBUG 1 #include <limits.h> #include "avformat.h" #include "mpegaudio.h" #include "avi.h" #undef NDEBUG #include <assert.h> //from /dev/random #define MAIN_STARTCODE (0x7A561F5F04ADULL + (((uint64_t)('N'<<8) + 'M')<<48)) #define STREAM_STARTCODE (0x11405BF2F9DBULL + (((uint64_t)('N'<<8) + 'S')<<48)) #define KEYFRAME_STARTCODE (0xE4ADEECA4569ULL + (((uint64_t)('N'<<8) + 'K')<<48)) #define INDEX_STARTCODE (0xDD672F23E64EULL + (((uint64_t)('N'<<8) + 'X')<<48)) #define INFO_STARTCODE (0xAB68B596BA78ULL + (((uint64_t)('N'<<8) + 'I')<<48)) #define MAX_DISTANCE (1024*16-1) #define MAX_SHORT_DISTANCE (1024*4-1) #define MAX_PTS_LRU 3 #define FLAG_DATA_SIZE 4 #define FLAG_PTS 3 #define FLAG_KEY_FRAME 8 typedef struct { uint8_t flags; uint8_t stream_id_plus1; uint16_t size_mul; uint16_t size_lsb; } FrameCode; typedef struct { int last_key_frame; int msb_timestamp_shift; int rate_num; int rate_den; int64_t last_pts; int lru_pts_delta[MAX_PTS_LRU]; int initial_pts_predictor[MAX_PTS_LRU]; int64_t last_sync_pos; ///<pos of last 1/2 type frame int decode_delay; } StreamContext; typedef struct { AVFormatContext *avf; int written_packet_size; int64_t packet_start[3]; //0-> startcode less, 1-> short startcode 2-> long startcodes FrameCode frame_code[256]; int stream_count; uint64_t next_startcode; ///< stores the next startcode if it has alraedy been parsed but the stream isnt seekable StreamContext *stream; int max_distance; } NUTContext; static char *info_table[][2]={ {NULL , NULL }, // end {NULL , NULL }, {NULL , "UTF8"}, {NULL , "v"}, {NULL , "s"}, {"StreamId" , "v"}, {"SegmentId" , "v"}, {"StartTimestamp" , "v"}, {"EndTimestamp" , "v"}, {"Author" , "UTF8"}, {"Title" , "UTF8"}, {"Description" , "UTF8"}, {"Copyright" , "UTF8"}, {"Encoder" , "UTF8"}, {"Keyword" , "UTF8"}, {"Cover" , "JPEG"}, {"Cover" , "PNG"}, }; static void update_lru(int *lru, int current, int count){ int i; for(i=0; i<count-1; i++){ if(lru[i] == current) break; } for(; i; i--){ lru[i]= lru[i-1]; } lru[0]= current; } static void update(NUTContext *nut, int stream_index, int64_t frame_start, int frame_type, int frame_code, int key_frame, int size, int64_t pts){ StreamContext *stream= &nut->stream[stream_index]; stream->last_key_frame= key_frame; nut->packet_start[ frame_type ]= frame_start; if(stream->last_pts != AV_NOPTS_VALUE){ assert(frame_type < 2); update_lru(stream->lru_pts_delta, pts - stream->last_pts, 3); } stream->last_pts= pts; } static void reset(AVFormatContext *s/*, int frame_type*/){ NUTContext *nut = s->priv_data; int i; for(i=0; i<s->nb_streams; i++){ StreamContext *stream= &nut->stream[i]; stream->last_key_frame= 1; stream->last_pts= AV_NOPTS_VALUE; memcpy(stream->lru_pts_delta, stream->initial_pts_predictor, sizeof(int)*MAX_PTS_LRU); } } static void build_frame_code(AVFormatContext *s){ NUTContext *nut = s->priv_data; int key_frame, index, pred, stream_id, full_pts; int start=0; int end= 255; int keyframe_0_esc= s->nb_streams > 2; if(keyframe_0_esc){ /* keyframe = 0 escape */ FrameCode *ft= &nut->frame_code[start]; ft->flags= FLAG_DATA_SIZE | FLAG_PTS; ft->stream_id_plus1= 0; 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_FRAME*key_frame; ft->flags|= FLAG_DATA_SIZE | FLAG_PTS; ft->stream_id_plus1= stream_id + 1; ft->size_mul=1; 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); for(full_pts=0; full_pts<2; full_pts++){ for(pred=0; pred<2; pred++){ FrameCode *ft= &nut->frame_code[start2]; ft->flags= FLAG_KEY_FRAME*key_frame + FLAG_PTS*full_pts; ft->stream_id_plus1= stream_id + 1; ft->size_mul=frame_bytes + 2; ft->size_lsb=frame_bytes + pred; start2++; av_log(NULL, AV_LOG_DEBUG, "%d\n", frame_bytes + pred); } } }else{ FrameCode *ft= &nut->frame_code[start2]; ft->flags= FLAG_KEY_FRAME | FLAG_DATA_SIZE; ft->stream_id_plus1= stream_id + 1; ft->size_mul=1; start2++; } #endif pred_count= 2 + codec->has_b_frames + (codec->codec_id == CODEC_ID_VORBIS); 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_FRAME*key_frame + pred*4; ft->flags|= FLAG_DATA_SIZE; ft->stream_id_plus1= stream_id + 1; //FIXME use single byte size and pred from last ft->size_mul= end3-start3; ft->size_lsb= index - start3; } nut->stream[stream_id].initial_pts_predictor[pred]= pred+1; } } memmove(&nut->frame_code['N'+1], &nut->frame_code['N'], sizeof(FrameCode)*(255-'N')); nut->frame_code['N'].flags= 1; } static uint64_t get_v(ByteIOContext *bc) { uint64_t val = 0; for(;;) { int tmp = get_byte(bc); if (tmp&0x80) val= (val<<7) + tmp - 0x80; else{ //av_log(NULL, AV_LOG_DEBUG, "get_v()= %lld\n", (val<<7) + tmp); return (val<<7) + tmp; } } return -1; } static int get_str(ByteIOContext *bc, char *string, int maxlen){ int len= get_v(bc); if(len && maxlen) get_buffer(bc, string, FFMIN(len, maxlen)); while(len > maxlen){ get_byte(bc); len--; } if(maxlen) string[FFMIN(len, maxlen-1)]= 0; if(maxlen == len) return -1; else return 0; } static uint64_t get_vb(ByteIOContext *bc){ uint64_t val=0; int i= get_v(bc); if(i>8) return UINT64_MAX; while(i--) val = (val<<8) + get_byte(bc); //av_log(NULL, AV_LOG_DEBUG, "get_vb()= %lld\n", val); return val; } static int get_packetheader(NUTContext *nut, ByteIOContext *bc, int calculate_checksum) { int64_t start, size; start= url_ftell(bc) - 8; init_checksum(bc, calculate_checksum ? update_adler32 : NULL, 0); size= get_v(bc); nut->packet_start[2] = start; nut->written_packet_size= size; return size; } static int check_checksum(ByteIOContext *bc){ unsigned long checksum= get_checksum(bc); return checksum != get_be32(bc); } /** * */ static int get_length(uint64_t val){ int i; for (i=7; val>>i; i+=7); return i; } static uint64_t find_any_startcode(ByteIOContext *bc, int64_t pos){ uint64_t state=0; if(pos >= 0) url_fseek(bc, pos, SEEK_SET); //note, this may fail if the stream isnt seekable, but that shouldnt matter, as in this case we simply start where we are currently while(!url_feof(bc)){ state= (state<<8) | get_byte(bc); if((state>>56) != 'N') continue; switch(state){ case MAIN_STARTCODE: case STREAM_STARTCODE: case KEYFRAME_STARTCODE: case INFO_STARTCODE: case INDEX_STARTCODE: return state; } } return 0; } /** * find the given startcode. * @param code the startcode * @param pos the start position of the search, or -1 if the current position * @returns the position of the startcode or -1 if not found */ static int64_t find_startcode(ByteIOContext *bc, uint64_t code, int64_t pos){ for(;;){ uint64_t startcode= find_any_startcode(bc, pos); if(startcode == code) return url_ftell(bc) - 8; else if(startcode == 0) return -1; pos=-1; } } #ifdef CONFIG_ENCODERS static void put_v(ByteIOContext *bc, uint64_t val) { int i; //av_log(NULL, AV_LOG_DEBUG, "put_v()= %lld\n", val); val &= 0x7FFFFFFFFFFFFFFFULL; // FIXME can only encode upto 63 bits currently i= get_length(val); for (i-=7; i>0; i-=7){ put_byte(bc, 0x80 | (val>>i)); } put_byte(bc, val&0x7f); } /** * 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_vb(ByteIOContext *bc, uint64_t val){ int i; for (i=8; val>>i; i+=8); put_v(bc, i>>3); for(i-=8; i>=0; i-=8) put_byte(bc, (val>>i)&0xFF); } static int put_packetheader(NUTContext *nut, ByteIOContext *bc, int max_size, int calculate_checksum) { put_flush_packet(bc); nut->packet_start[2]+= nut->written_packet_size; assert(url_ftell(bc) - 8 == nut->packet_start[2]); nut->written_packet_size = max_size; if(calculate_checksum) init_checksum(bc, update_adler32, 0); /* packet header */ put_v(bc, nut->written_packet_size); /* forward ptr */ return 0; } static int update_packetheader(NUTContext *nut, ByteIOContext *bc, int additional_size, int calculate_checksum){ int64_t start= nut->packet_start[2]; int64_t cur= url_ftell(bc); int size= cur - start + additional_size; if(calculate_checksum) size += 4; if(size != nut->written_packet_size){ int i; assert( size <= nut->written_packet_size ); url_fseek(bc, start + 8, SEEK_SET); for(i=get_length(size); i < get_length(nut->written_packet_size); i+=7) put_byte(bc, 0x80); put_v(bc, size); url_fseek(bc, cur, SEEK_SET); nut->written_packet_size= size; //FIXME may fail if multiple updates with differing sizes, as get_length may differ if(calculate_checksum) put_be32(bc, get_checksum(bc)); } return 0; } static int nut_write_header(AVFormatContext *s) { NUTContext *nut = s->priv_data; ByteIOContext *bc = &s->pb; AVCodecContext *codec; int i, j; nut->avf= s; nut->stream = av_mallocz(sizeof(StreamContext)*s->nb_streams); av_set_pts_info(s, 60, 1, AV_TIME_BASE); /* main header */ put_be64(bc, MAIN_STARTCODE); put_packetheader(nut, bc, 120+5*256, 1); put_v(bc, 2); /* version */ put_v(bc, s->nb_streams); put_v(bc, MAX_DISTANCE); build_frame_code(s); assert(nut->frame_code['N'].flags == 1); for(i=0; i<256;){ int tmp_flags = nut->frame_code[i].flags; int tmp_stream= nut->frame_code[i].stream_id_plus1; int tmp_mul = nut->frame_code[i].size_mul; int tmp_size = nut->frame_code[i].size_lsb; put_v(bc, tmp_flags); put_v(bc, tmp_stream); put_v(bc, tmp_mul); put_v(bc, tmp_size); for(j=0; i<256; j++,i++){ if(nut->frame_code[i].flags != tmp_flags ) break; if(nut->frame_code[i].stream_id_plus1 != tmp_stream) break; if(nut->frame_code[i].size_mul != tmp_mul ) break; if(nut->frame_code[i].size_lsb != tmp_size ) break; if(++tmp_size >= tmp_mul){ tmp_size=0; tmp_stream++; } } put_v(bc, j); } update_packetheader(nut, bc, 0, 1); /* stream headers */ for (i = 0; i < s->nb_streams; i++) { int nom, denom, gcd; codec = &s->streams[i]->codec; put_be64(bc, STREAM_STARTCODE); put_packetheader(nut, bc, 120 + codec->extradata_size, 1); put_v(bc, i /*s->streams[i]->index*/); put_v(bc, (codec->codec_type == CODEC_TYPE_AUDIO) ? 32 : 0); if (codec->codec_tag) put_vb(bc, codec->codec_tag); else if (codec->codec_type == CODEC_TYPE_VIDEO) { put_vb(bc, codec_get_bmp_tag(codec->codec_id)); } else if (codec->codec_type == CODEC_TYPE_AUDIO) { put_vb(bc, codec_get_wav_tag(codec->codec_id)); } else put_vb(bc, 0); if (codec->codec_type == CODEC_TYPE_VIDEO) { nom = codec->frame_rate; denom = codec->frame_rate_base; } else { nom = codec->sample_rate; if(codec->frame_size>0) denom= codec->frame_size; else denom= 1; //unlucky } gcd= ff_gcd(nom, denom); nom /= gcd; denom /= gcd; nut->stream[i].rate_num= nom; nut->stream[i].rate_den= denom; put_v(bc, codec->bit_rate); put_vb(bc, 0); /* no language code */ put_v(bc, nom); put_v(bc, denom); if(nom / denom < 1000) nut->stream[i].msb_timestamp_shift = 7; else nut->stream[i].msb_timestamp_shift = 14; put_v(bc, nut->stream[i].msb_timestamp_shift); for(j=0; j<3; j++) put_v(bc, nut->stream[i].initial_pts_predictor[j]); put_v(bc, codec->has_b_frames); put_byte(bc, 0); /* flags: 0x1 - fixed_fps, 0x2 - index_present */ if(codec->extradata_size){ put_v(bc, 1); put_v(bc, codec->extradata_size); put_buffer(bc, codec->extradata, codec->extradata_size); } put_v(bc, 0); /* end of codec specific headers */ 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); put_v(bc, codec->sample_aspect_ratio.num); put_v(bc, codec->sample_aspect_ratio.den); put_v(bc, 0); /* csp type -- unknown */ break; default: break; } update_packetheader(nut, bc, 0, 1); } /* info header */ put_be64(bc, INFO_STARTCODE); put_packetheader(nut, bc, 30+strlen(s->author)+strlen(s->title)+ strlen(s->comment)+strlen(s->copyright)+strlen(LIBAVFORMAT_IDENT), 1); if (s->author[0]) { put_v(bc, 9); /* type */ put_str(bc, s->author); } if (s->title[0]) { put_v(bc, 10); /* type */ put_str(bc, s->title); } if (s->comment[0]) { put_v(bc, 11); /* type */ put_str(bc, s->comment); } if (s->copyright[0]) { put_v(bc, 12); /* type */ put_str(bc, s->copyright); } /* encoder */ if(!(s->streams[0]->codec.flags & CODEC_FLAG_BITEXACT)){ put_v(bc, 13); /* type */ put_str(bc, LIBAVFORMAT_IDENT); } put_v(bc, 0); /* eof info */ update_packetheader(nut, bc, 0, 1); put_flush_packet(bc); return 0; } static int64_t lsb2full(StreamContext *stream, int64_t lsb){ int64_t mask = (1<<stream->msb_timestamp_shift)-1; int64_t delta= stream->last_pts - mask/2; return ((lsb - delta)&mask) + delta; } static int nut_write_packet(AVFormatContext *s, int stream_index, const uint8_t *buf, int size, int64_t pts) { NUTContext *nut = s->priv_data; StreamContext *stream= &nut->stream[stream_index]; ByteIOContext *bc = &s->pb; int key_frame = 0, full_pts=0; AVCodecContext *enc; int64_t coded_pts; int frame_type, best_length, frame_code, flags, i, size_mul, size_lsb; const int64_t frame_start= url_ftell(bc); if (stream_index > s->nb_streams) return 1; pts= (av_rescale(pts, stream->rate_num, stream->rate_den) + AV_TIME_BASE/2) / AV_TIME_BASE; enc = &s->streams[stream_index]->codec; key_frame = enc->coded_frame->key_frame; if(enc->coded_frame->pts != AV_NOPTS_VALUE) pts= (av_rescale(enc->coded_frame->pts, stream->rate_num, stream->rate_den) + AV_TIME_BASE/2) / AV_TIME_BASE; //FIXME XXX HACK frame_type=0; if(frame_start + size + 20 - FFMAX(nut->packet_start[1], nut->packet_start[2]) > MAX_DISTANCE) frame_type=2; if(key_frame && !stream->last_key_frame) frame_type=2; if(frame_type>1) reset(s); if(stream->last_pts == AV_NOPTS_VALUE) full_pts=1; else{ coded_pts = pts & ((1<<stream->msb_timestamp_shift)-1); if(lsb2full(stream, coded_pts) != pts) full_pts=1; } if(full_pts) coded_pts= pts + (1<<stream->msb_timestamp_shift); best_length=INT_MAX; frame_code= -1; for(i=0; i<256; i++){ int stream_id_plus1= nut->frame_code[i].stream_id_plus1; int fc_key_frame; int length=0; size_mul= nut->frame_code[i].size_mul; size_lsb= nut->frame_code[i].size_lsb; flags= nut->frame_code[i].flags; assert(size_mul > size_lsb); if(stream_id_plus1 == 0) length+= get_length(stream_index); else if(stream_id_plus1 - 1 != stream_index) continue; fc_key_frame= !!(flags & FLAG_KEY_FRAME); assert(key_frame==0 || key_frame==1); if(fc_key_frame != key_frame) continue; if(flags & FLAG_DATA_SIZE){ if(size % size_mul != size_lsb) continue; length += get_length(size / size_mul); }else if(size != size_lsb) continue; if(full_pts && (flags & FLAG_PTS) != FLAG_PTS) continue; if(flags&FLAG_PTS){ length += get_length(coded_pts); }else{ int delta= stream->lru_pts_delta[flags & FLAG_PTS]; if(delta != pts - stream->last_pts) continue; assert(frame_type < 2); } if(length < best_length){ best_length= length; frame_code=i; } // av_log(s, AV_LOG_DEBUG, "%d %d %d %d %d %d %d %d %d %d\n", key_frame, frame_type, full_pts, size, stream_index, flags, size_mul, size_lsb, stream_id_plus1, length); } assert(frame_code != -1); flags= nut->frame_code[frame_code].flags; size_mul= nut->frame_code[frame_code].size_mul; size_lsb= nut->frame_code[frame_code].size_lsb; #if 0 best_length /= 7; best_length ++; //frame_code if(frame_type==2){ best_length += 8; // startcode } av_log(s, AV_LOG_DEBUG, "kf:%d ft:%d pt:%d fc:%2X len:%2d size:%d stream:%d flag:%d mul:%d lsb:%d s+1:%d pts_delta:%d pts:%lld\n", key_frame, frame_type, full_pts ? 2 : ((flags & FLAG_PTS) == FLAG_PTS ? 1 : 0), frame_code, best_length, size, stream_index, flags, size_mul, size_lsb, nut->frame_code[frame_code].stream_id_plus1,(int)(pts - stream->last_pts), pts); // av_log(s, AV_LOG_DEBUG, "%d %d %d\n", stream->lru_pts_delta[0], stream->lru_pts_delta[1], stream->lru_pts_delta[2]); #endif if (frame_type==2) put_be64(bc, KEYFRAME_STARTCODE); assert(frame_type != 1); //short startcode not implemented yet put_byte(bc, frame_code); if(nut->frame_code[frame_code].stream_id_plus1 == 0) put_v(bc, stream_index); if ((flags & FLAG_PTS) == FLAG_PTS){ put_v(bc, coded_pts); } if(flags & FLAG_DATA_SIZE) put_v(bc, size / size_mul); if(size > MAX_DISTANCE){ assert(frame_type > 1); } put_buffer(bc, buf, size); update(nut, stream_index, frame_start, frame_type, frame_code, key_frame, size, pts); return 0; } static int nut_write_trailer(AVFormatContext *s) { NUTContext *nut = s->priv_data; ByteIOContext *bc = &s->pb; #if 0 int i; /* WRITE INDEX */ for (i = 0; s->nb_streams; i++) { put_be64(bc, INDEX_STARTCODE); put_packetheader(nut, bc, 64, 1); put_v(bc, s->streams[i]->id); put_v(bc, ...); update_packetheader(nut, bc, 0, 1); } #endif put_flush_packet(bc); av_freep(&nut->stream); return 0; } #endif //CONFIG_ENCODERS static int nut_probe(AVProbeData *p) { int i; uint64_t code= 0xff; for (i = 0; i < p->buf_size; i++) { code = (code << 8) | p->buf[i]; if (code == MAIN_STARTCODE) return AVPROBE_SCORE_MAX; } return 0; } static int decode_main_header(NUTContext *nut){ AVFormatContext *s= nut->avf; ByteIOContext *bc = &s->pb; uint64_t tmp; int i, j; get_packetheader(nut, bc, 1); tmp = get_v(bc); if (tmp != 2){ av_log(s, AV_LOG_ERROR, "bad version (%Ld)\n", tmp); return -1; } nut->stream_count = get_v(bc); nut->max_distance = get_v(bc); for(i=0; i<256;){ int tmp_flags = get_v(bc); int tmp_stream= get_v(bc); int tmp_mul = get_v(bc); int tmp_size = get_v(bc); int count = get_v(bc); if(count == 0 || i+count > 256){ av_log(s, AV_LOG_ERROR, "illegal count %d at %d\n", count, i); return -1; } for(j=0; j<count; j++,i++){ if(tmp_stream > nut->stream_count + 1){ av_log(s, AV_LOG_ERROR, "illegal stream number\n"); return -1; } nut->frame_code[i].flags = tmp_flags ; nut->frame_code[i].stream_id_plus1 = tmp_stream; nut->frame_code[i].size_mul = tmp_mul ; nut->frame_code[i].size_lsb = tmp_size ; if(++tmp_size >= tmp_mul){ tmp_size=0; tmp_stream++; } } } if(nut->frame_code['N'].flags != 1){ av_log(s, AV_LOG_ERROR, "illegal frame_code table\n"); return -1; } if(check_checksum(bc)){ av_log(s, AV_LOG_ERROR, "Main header checksum missmatch\n"); return -1; } return 0; } static int decode_stream_header(NUTContext *nut){ AVFormatContext *s= nut->avf; ByteIOContext *bc = &s->pb; int class, nom, denom, stream_id, i; uint64_t tmp; AVStream *st; get_packetheader(nut, bc, 1); stream_id= get_v(bc); if(stream_id >= nut->stream_count || s->streams[stream_id]) return -1; st = av_new_stream(s, stream_id); if (!st) return AVERROR_NOMEM; class = get_v(bc); tmp = get_vb(bc); st->codec.codec_tag= tmp; switch(class) { case 0: st->codec.codec_type = CODEC_TYPE_VIDEO; st->codec.codec_id = codec_get_bmp_id(tmp); if (st->codec.codec_id == CODEC_ID_NONE) av_log(s, AV_LOG_ERROR, "Unknown codec?!\n"); break; case 32: st->codec.codec_type = CODEC_TYPE_AUDIO; st->codec.codec_id = codec_get_wav_id(tmp); if (st->codec.codec_id == CODEC_ID_NONE) av_log(s, AV_LOG_ERROR, "Unknown codec?!\n"); break; default: av_log(s, AV_LOG_ERROR, "Unknown stream class (%d)\n", class); return -1; } s->bit_rate += get_v(bc); get_vb(bc); /* language code */ nom = get_v(bc); denom = get_v(bc); nut->stream[stream_id].msb_timestamp_shift = get_v(bc); for(i=0; i<3; i++) nut->stream[stream_id].initial_pts_predictor[i]= get_v(bc); nut->stream[stream_id].decode_delay= get_v(bc); get_byte(bc); /* flags */ /* codec specific data headers */ while(get_v(bc) != 0){ st->codec.extradata_size= get_v(bc); st->codec.extradata= av_mallocz(st->codec.extradata_size); get_buffer(bc, st->codec.extradata, st->codec.extradata_size); // url_fskip(bc, get_v(bc)); } if (class == 0) /* VIDEO */ { st->codec.width = get_v(bc); st->codec.height = get_v(bc); st->codec.sample_aspect_ratio.num= get_v(bc); st->codec.sample_aspect_ratio.den= get_v(bc); get_v(bc); /* csp type */ st->codec.frame_rate = nom; st->codec.frame_rate_base = denom; } if (class == 32) /* AUDIO */ { st->codec.sample_rate = get_v(bc); get_v(bc); // samplerate_den st->codec.channels = get_v(bc); } if(check_checksum(bc)){ av_log(s, AV_LOG_ERROR, "Stream header %d checksum missmatch\n", stream_id); return -1; } nut->stream[stream_id].rate_num= nom; nut->stream[stream_id].rate_den= denom; return 0; } static int decode_info_header(NUTContext *nut){ AVFormatContext *s= nut->avf; ByteIOContext *bc = &s->pb; get_packetheader(nut, bc, 1); for(;;){ int id= get_v(bc); char *name, *type, custom_name[256], custom_type[256]; if(!id) break; else if(id >= sizeof(info_table)/sizeof(info_table[0])){ av_log(s, AV_LOG_ERROR, "info id is too large %d %d\n", id, sizeof(info_table)/sizeof(info_table[0])); return -1; } type= info_table[id][1]; name= info_table[id][0]; //av_log(s, AV_LOG_DEBUG, "%d %s %s\n", id, type, name); if(!type){ get_str(bc, custom_type, sizeof(custom_type)); type= custom_type; } if(!name){ get_str(bc, custom_name, sizeof(custom_name)); name= custom_name; } if(!strcmp(type, "v")){ int value= get_v(bc); }else{ if(!strcmp(name, "Author")) get_str(bc, s->author, sizeof(s->author)); else if(!strcmp(name, "Title")) get_str(bc, s->title, sizeof(s->title)); else if(!strcmp(name, "Copyright")) get_str(bc, s->copyright, sizeof(s->copyright)); else if(!strcmp(name, "Description")) get_str(bc, s->comment, sizeof(s->comment)); else get_str(bc, NULL, 0); } } if(check_checksum(bc)){ av_log(s, AV_LOG_ERROR, "Info header checksum missmatch\n"); return -1; } return 0; } static int nut_read_header(AVFormatContext *s, AVFormatParameters *ap) { NUTContext *nut = s->priv_data; ByteIOContext *bc = &s->pb; int64_t pos; int inited_stream_count; nut->avf= s; av_set_pts_info(s, 60, 1, AV_TIME_BASE); /* main header */ pos=0; for(;;){ pos= find_startcode(bc, MAIN_STARTCODE, pos)+1; if (pos<0){ av_log(s, AV_LOG_ERROR, "no main startcode found\n"); return -1; } if(decode_main_header(nut) >= 0) break; } s->bit_rate = 0; nut->stream = av_malloc(sizeof(StreamContext)*nut->stream_count); /* stream headers */ pos=0; for(inited_stream_count=0; inited_stream_count < nut->stream_count;){ pos= find_startcode(bc, STREAM_STARTCODE, pos)+1; if (pos<0){ av_log(s, AV_LOG_ERROR, "not all stream headers found\n"); return -1; } if(decode_stream_header(nut) >= 0) inited_stream_count++; } /* info headers */ pos=0; for(;;){ uint64_t startcode= find_any_startcode(bc, pos); pos= url_ftell(bc); if(startcode==0){ av_log(s, AV_LOG_ERROR, "EOF before video frames\n"); return -1; }else if(startcode == KEYFRAME_STARTCODE){ nut->next_startcode= startcode; break; }else if(startcode != INFO_STARTCODE){ continue; } decode_info_header(nut); } return 0; } static int decode_frame_header(NUTContext *nut, int *key_frame_ret, int64_t *pts_ret, int *stream_id_ret, int frame_code, int frame_type){ AVFormatContext *s= nut->avf; StreamContext *stream; ByteIOContext *bc = &s->pb; int size, flags, size_mul, size_lsb, stream_id; int64_t pts = 0; const int prefix_len= frame_type == 2 ? 8+1 : 1; const int64_t frame_start= url_ftell(bc) - prefix_len; if(frame_type < 2 && frame_start - nut->packet_start[2] > nut->max_distance){ av_log(s, AV_LOG_ERROR, "last frame must have been damaged\n"); return -1; } if(frame_type) nut->packet_start[ frame_type ]= frame_start; //otherwise 1 goto 1 may happen flags= nut->frame_code[frame_code].flags; size_mul= nut->frame_code[frame_code].size_mul; size_lsb= nut->frame_code[frame_code].size_lsb; stream_id= nut->frame_code[frame_code].stream_id_plus1 - 1; if(frame_type == 2) reset(s); if(stream_id==-1) stream_id= get_v(bc); if(stream_id >= s->nb_streams){ av_log(s, AV_LOG_ERROR, "illegal stream_id\n"); return -1; } stream= &nut->stream[stream_id]; // av_log(s, AV_LOG_DEBUG, "ft:%d ppts:%d %d %d\n", frame_type, stream->lru_pts_delta[0], stream->lru_pts_delta[1], stream->lru_pts_delta[2]); *key_frame_ret= !!(flags & FLAG_KEY_FRAME); if((flags & FLAG_PTS) == FLAG_PTS){ int64_t mask = (1<<stream->msb_timestamp_shift)-1; pts= get_v(bc); if(pts > mask){ pts -= mask+1; }else{ if(stream->last_pts == AV_NOPTS_VALUE){ av_log(s, AV_LOG_ERROR, "no reference pts available\n"); return -1; } pts= lsb2full(stream, pts); } }else{ if(stream->last_pts == AV_NOPTS_VALUE){ av_log(s, AV_LOG_ERROR, "no reference pts available\n"); return -1; } pts= stream->last_pts + stream->lru_pts_delta[flags&FLAG_PTS]; } if(*key_frame_ret){ int64_t av_pts= pts * AV_TIME_BASE * stream->rate_den / stream->rate_num; // av_log(s, AV_LOG_DEBUG, "stream:%d start:%lld pts:%lld length:%lld\n",stream_id, frame_start, av_pts, frame_start - nut->stream[stream_id].last_sync_pos); av_add_index_entry( s->streams[stream_id], frame_start, av_pts, frame_start - nut->stream[stream_id].last_sync_pos, AVINDEX_KEYFRAME); nut->stream[stream_id].last_sync_pos= frame_start; // assert(nut->packet_start == frame_start); } assert(size_mul > size_lsb); size= size_lsb; if(flags & FLAG_DATA_SIZE) size+= size_mul*get_v(bc); //av_log(s, AV_LOG_DEBUG, "fs:%lld fc:%d ft:%d kf:%d pts:%lld size:%d\n", frame_start, frame_code, frame_type, key_frame, pts, size); if(frame_type==0 && url_ftell(bc) - nut->packet_start[2] + size > nut->max_distance){ av_log(s, AV_LOG_ERROR, "frame size too large\n"); return -1; } *stream_id_ret = stream_id; *pts_ret = pts * AV_TIME_BASE * stream->rate_den / stream->rate_num; update(nut, stream_id, frame_start, frame_type, frame_code, *key_frame_ret, size, pts); return size; } static int decode_frame(NUTContext *nut, AVPacket *pkt, int frame_code, int frame_type){ AVFormatContext *s= nut->avf; ByteIOContext *bc = &s->pb; int size, stream_id, key_frame; int64_t pts; size= decode_frame_header(nut, &key_frame, &pts, &stream_id, frame_code, frame_type); if(size < 0) return -1; av_new_packet(pkt, size); get_buffer(bc, pkt->data, size); pkt->stream_index = stream_id; if (key_frame) pkt->flags |= PKT_FLAG_KEY; pkt->pts = pts; return 0; } static int nut_read_packet(AVFormatContext *s, AVPacket *pkt) { NUTContext *nut = s->priv_data; ByteIOContext *bc = &s->pb; int i, frame_code=0; for(;;){ int frame_type= 0; uint64_t tmp= nut->next_startcode; nut->next_startcode=0; if (url_feof(bc)) return -1; if(!tmp){ frame_code = get_byte(bc); if(frame_code == 'N'){ tmp= frame_code; for(i=1; i<8; i++) tmp = (tmp<<8) + get_byte(bc); } } switch(tmp){ case MAIN_STARTCODE: case STREAM_STARTCODE: case INDEX_STARTCODE: get_packetheader(nut, bc, 0); url_fseek(bc, nut->written_packet_size + nut->packet_start[2], SEEK_SET); break; case INFO_STARTCODE: if(decode_info_header(nut)<0) goto resync; break; case KEYFRAME_STARTCODE: frame_type = 2; frame_code = get_byte(bc); case 0: if(decode_frame(nut, pkt, frame_code, frame_type)>=0) return 0; default: resync: av_log(s, AV_LOG_DEBUG, "syncing from %lld\n", nut->packet_start[2]+1); tmp= find_any_startcode(bc, nut->packet_start[2]+1); if(tmp==0) return -1; av_log(s, AV_LOG_DEBUG, "sync\n"); nut->next_startcode= tmp; } } } static int64_t nut_read_timestamp(AVFormatContext *s, int stream_index, int64_t *pos_arg, int64_t pos_limit){ NUTContext *nut = s->priv_data; StreamContext *stream; ByteIOContext *bc = &s->pb; int64_t pos, pts; uint64_t code; int frame_code,step, stream_id, i,size, key_frame; av_log(s, AV_LOG_DEBUG, "read_timestamp(X,%d,%lld,%lld)\n", stream_index, *pos_arg, pos_limit); if(*pos_arg < 0) return AV_NOPTS_VALUE; pos= *pos_arg; step= FFMIN(16*1024, pos); do{ pos-= step; code= find_any_startcode(bc, pos); if(code && url_ftell(bc) - 8 <= *pos_arg) break; step= FFMIN(2*step, pos); }while(step); if(!code) //nothing found, not even after pos_arg return AV_NOPTS_VALUE; url_fseek(bc, -8, SEEK_CUR); for(i=0; i<s->nb_streams; i++) nut->stream[i].last_sync_pos= url_ftell(bc); for(;;){ int frame_type=0; int64_t pos= url_ftell(bc); uint64_t tmp=0; if(pos > pos_limit || url_feof(bc)) return AV_NOPTS_VALUE; frame_code = get_byte(bc); if(frame_code == 'N'){ tmp= frame_code; for(i=1; i<8; i++) tmp = (tmp<<8) + get_byte(bc); } //av_log(s, AV_LOG_DEBUG, "before switch %llX at=%lld\n", tmp, pos); switch(tmp){ case MAIN_STARTCODE: case STREAM_STARTCODE: case INDEX_STARTCODE: case INFO_STARTCODE: get_packetheader(nut, bc, 0); assert(nut->packet_start[2]==pos); url_fseek(bc, nut->written_packet_size + pos, SEEK_SET); break; case KEYFRAME_STARTCODE: frame_type=2; frame_code = get_byte(bc); case 0: size= decode_frame_header(nut, &key_frame, &pts, &stream_id, frame_code, frame_type); if(size < 0) goto resync; stream= &nut->stream[stream_id]; if(stream_id != stream_index || !key_frame || pos < *pos_arg){ url_fseek(bc, size, SEEK_CUR); break; } *pos_arg= pos; return pts; default: resync: av_log(s, AV_LOG_DEBUG, "syncing from %lld\n", nut->packet_start[2]+1); if(!find_any_startcode(bc, nut->packet_start[2]+1)) return AV_NOPTS_VALUE; url_fseek(bc, -8, SEEK_CUR); } } return AV_NOPTS_VALUE; } static int nut_read_seek(AVFormatContext *s, int stream_index, int64_t target_ts){ // NUTContext *nut = s->priv_data; int64_t pos; if(av_seek_frame_binary(s, stream_index, target_ts) < 0) return -1; pos= url_ftell(&s->pb); nut_read_timestamp(s, stream_index, &pos, pos-1); return 0; } static int nut_read_close(AVFormatContext *s) { NUTContext *nut = s->priv_data; int i; for(i=0;i<s->nb_streams;i++) { av_freep(&s->streams[i]->codec.extradata); } av_freep(&nut->stream); return 0; } static AVInputFormat nut_iformat = { "nut", "nut format", sizeof(NUTContext), nut_probe, nut_read_header, nut_read_packet, nut_read_close, nut_read_seek, nut_read_timestamp, .extensions = "nut", }; #ifdef CONFIG_ENCODERS static AVOutputFormat nut_oformat = { "nut", "nut format", "video/x-nut", "nut", sizeof(NUTContext), #ifdef CONFIG_VORBIS CODEC_ID_VORBIS, #elif defined(CONFIG_MP3LAME) CODEC_ID_MP3, #else CODEC_ID_MP2, /* AC3 needs liba52 decoder */ #endif CODEC_ID_MPEG4, nut_write_header, nut_write_packet, nut_write_trailer, }; #endif //CONFIG_ENCODERS int nut_init(void) { av_register_input_format(&nut_iformat); #ifdef CONFIG_ENCODERS av_register_output_format(&nut_oformat); #endif //CONFIG_ENCODERS return 0; }