Libav 0.7.1
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00001 /* 00002 * "NUT" Container Format demuxer 00003 * Copyright (c) 2004-2006 Michael Niedermayer 00004 * Copyright (c) 2003 Alex Beregszaszi 00005 * 00006 * This file is part of Libav. 00007 * 00008 * Libav is free software; you can redistribute it and/or 00009 * modify it under the terms of the GNU Lesser General Public 00010 * License as published by the Free Software Foundation; either 00011 * version 2.1 of the License, or (at your option) any later version. 00012 * 00013 * Libav is distributed in the hope that it will be useful, 00014 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00015 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00016 * Lesser General Public License for more details. 00017 * 00018 * You should have received a copy of the GNU Lesser General Public 00019 * License along with Libav; if not, write to the Free Software 00020 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 00021 */ 00022 00023 #include <strings.h> 00024 #include "libavutil/avstring.h" 00025 #include "libavutil/bswap.h" 00026 #include "libavutil/dict.h" 00027 #include "libavutil/tree.h" 00028 #include "avio_internal.h" 00029 #include "nut.h" 00030 00031 #undef NDEBUG 00032 #include <assert.h> 00033 00034 #define NUT_MAX_STREAMS 256 /* arbitrary sanity check value */ 00035 00036 static int get_str(AVIOContext *bc, char *string, unsigned int maxlen){ 00037 unsigned int len= ffio_read_varlen(bc); 00038 00039 if(len && maxlen) 00040 avio_read(bc, string, FFMIN(len, maxlen)); 00041 while(len > maxlen){ 00042 avio_r8(bc); 00043 len--; 00044 } 00045 00046 if(maxlen) 00047 string[FFMIN(len, maxlen-1)]= 0; 00048 00049 if(maxlen == len) 00050 return -1; 00051 else 00052 return 0; 00053 } 00054 00055 static int64_t get_s(AVIOContext *bc){ 00056 int64_t v = ffio_read_varlen(bc) + 1; 00057 00058 if (v&1) return -(v>>1); 00059 else return (v>>1); 00060 } 00061 00062 static uint64_t get_fourcc(AVIOContext *bc){ 00063 unsigned int len= ffio_read_varlen(bc); 00064 00065 if (len==2) return avio_rl16(bc); 00066 else if(len==4) return avio_rl32(bc); 00067 else return -1; 00068 } 00069 00070 #ifdef TRACE 00071 static inline uint64_t get_v_trace(AVIOContext *bc, char *file, char *func, int line){ 00072 uint64_t v= ffio_read_varlen(bc); 00073 00074 av_log(NULL, AV_LOG_DEBUG, "get_v %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line); 00075 return v; 00076 } 00077 00078 static inline int64_t get_s_trace(AVIOContext *bc, char *file, char *func, int line){ 00079 int64_t v= get_s(bc); 00080 00081 av_log(NULL, AV_LOG_DEBUG, "get_s %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line); 00082 return v; 00083 } 00084 00085 static inline uint64_t get_vb_trace(AVIOContext *bc, char *file, char *func, int line){ 00086 uint64_t v= get_vb(bc); 00087 00088 av_log(NULL, AV_LOG_DEBUG, "get_vb %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line); 00089 return v; 00090 } 00091 #define ffio_read_varlen(bc) get_v_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__) 00092 #define get_s(bc) get_s_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__) 00093 #define get_vb(bc) get_vb_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__) 00094 #endif 00095 00096 static int get_packetheader(NUTContext *nut, AVIOContext *bc, int calculate_checksum, uint64_t startcode) 00097 { 00098 int64_t size; 00099 // start= avio_tell(bc) - 8; 00100 00101 startcode= av_be2ne64(startcode); 00102 startcode= ff_crc04C11DB7_update(0, (uint8_t*)&startcode, 8); 00103 00104 ffio_init_checksum(bc, ff_crc04C11DB7_update, startcode); 00105 size= ffio_read_varlen(bc); 00106 if(size > 4096) 00107 avio_rb32(bc); 00108 if(ffio_get_checksum(bc) && size > 4096) 00109 return -1; 00110 00111 ffio_init_checksum(bc, calculate_checksum ? ff_crc04C11DB7_update : NULL, 0); 00112 00113 return size; 00114 } 00115 00116 static uint64_t find_any_startcode(AVIOContext *bc, int64_t pos){ 00117 uint64_t state=0; 00118 00119 if(pos >= 0) 00120 avio_seek(bc, pos, SEEK_SET); //note, this may fail if the stream is not seekable, but that should not matter, as in this case we simply start where we currently are 00121 00122 while(!bc->eof_reached){ 00123 state= (state<<8) | avio_r8(bc); 00124 if((state>>56) != 'N') 00125 continue; 00126 switch(state){ 00127 case MAIN_STARTCODE: 00128 case STREAM_STARTCODE: 00129 case SYNCPOINT_STARTCODE: 00130 case INFO_STARTCODE: 00131 case INDEX_STARTCODE: 00132 return state; 00133 } 00134 } 00135 00136 return 0; 00137 } 00138 00145 static int64_t find_startcode(AVIOContext *bc, uint64_t code, int64_t pos){ 00146 for(;;){ 00147 uint64_t startcode= find_any_startcode(bc, pos); 00148 if(startcode == code) 00149 return avio_tell(bc) - 8; 00150 else if(startcode == 0) 00151 return -1; 00152 pos=-1; 00153 } 00154 } 00155 00156 static int nut_probe(AVProbeData *p){ 00157 int i; 00158 uint64_t code= 0; 00159 00160 for (i = 0; i < p->buf_size; i++) { 00161 code = (code << 8) | p->buf[i]; 00162 if (code == MAIN_STARTCODE) 00163 return AVPROBE_SCORE_MAX; 00164 } 00165 return 0; 00166 } 00167 00168 #define GET_V(dst, check) \ 00169 tmp= ffio_read_varlen(bc);\ 00170 if(!(check)){\ 00171 av_log(s, AV_LOG_ERROR, "Error " #dst " is (%"PRId64")\n", tmp);\ 00172 return -1;\ 00173 }\ 00174 dst= tmp; 00175 00176 static int skip_reserved(AVIOContext *bc, int64_t pos){ 00177 pos -= avio_tell(bc); 00178 if(pos<0){ 00179 avio_seek(bc, pos, SEEK_CUR); 00180 return -1; 00181 }else{ 00182 while(pos--) 00183 avio_r8(bc); 00184 return 0; 00185 } 00186 } 00187 00188 static int decode_main_header(NUTContext *nut){ 00189 AVFormatContext *s= nut->avf; 00190 AVIOContext *bc = s->pb; 00191 uint64_t tmp, end; 00192 unsigned int stream_count; 00193 int i, j, tmp_stream, tmp_mul, tmp_pts, tmp_size, count, tmp_res, tmp_head_idx; 00194 00195 end= get_packetheader(nut, bc, 1, MAIN_STARTCODE); 00196 end += avio_tell(bc); 00197 00198 GET_V(tmp , tmp >=2 && tmp <= 3) 00199 GET_V(stream_count , tmp > 0 && tmp <= NUT_MAX_STREAMS) 00200 00201 nut->max_distance = ffio_read_varlen(bc); 00202 if(nut->max_distance > 65536){ 00203 av_log(s, AV_LOG_DEBUG, "max_distance %d\n", nut->max_distance); 00204 nut->max_distance= 65536; 00205 } 00206 00207 GET_V(nut->time_base_count, tmp>0 && tmp<INT_MAX / sizeof(AVRational)) 00208 nut->time_base= av_malloc(nut->time_base_count * sizeof(AVRational)); 00209 00210 for(i=0; i<nut->time_base_count; i++){ 00211 GET_V(nut->time_base[i].num, tmp>0 && tmp<(1ULL<<31)) 00212 GET_V(nut->time_base[i].den, tmp>0 && tmp<(1ULL<<31)) 00213 if(av_gcd(nut->time_base[i].num, nut->time_base[i].den) != 1){ 00214 av_log(s, AV_LOG_ERROR, "time base invalid\n"); 00215 return AVERROR_INVALIDDATA; 00216 } 00217 } 00218 tmp_pts=0; 00219 tmp_mul=1; 00220 tmp_stream=0; 00221 tmp_head_idx= 0; 00222 for(i=0; i<256;){ 00223 int tmp_flags = ffio_read_varlen(bc); 00224 int tmp_fields= ffio_read_varlen(bc); 00225 if(tmp_fields>0) tmp_pts = get_s(bc); 00226 if(tmp_fields>1) tmp_mul = ffio_read_varlen(bc); 00227 if(tmp_fields>2) tmp_stream= ffio_read_varlen(bc); 00228 if(tmp_fields>3) tmp_size = ffio_read_varlen(bc); 00229 else tmp_size = 0; 00230 if(tmp_fields>4) tmp_res = ffio_read_varlen(bc); 00231 else tmp_res = 0; 00232 if(tmp_fields>5) count = ffio_read_varlen(bc); 00233 else count = tmp_mul - tmp_size; 00234 if(tmp_fields>6) get_s(bc); 00235 if(tmp_fields>7) tmp_head_idx= ffio_read_varlen(bc); 00236 00237 while(tmp_fields-- > 8) 00238 ffio_read_varlen(bc); 00239 00240 if(count == 0 || i+count > 256){ 00241 av_log(s, AV_LOG_ERROR, "illegal count %d at %d\n", count, i); 00242 return AVERROR_INVALIDDATA; 00243 } 00244 if(tmp_stream >= stream_count){ 00245 av_log(s, AV_LOG_ERROR, "illegal stream number\n"); 00246 return AVERROR_INVALIDDATA; 00247 } 00248 00249 for(j=0; j<count; j++,i++){ 00250 if (i == 'N') { 00251 nut->frame_code[i].flags= FLAG_INVALID; 00252 j--; 00253 continue; 00254 } 00255 nut->frame_code[i].flags = tmp_flags ; 00256 nut->frame_code[i].pts_delta = tmp_pts ; 00257 nut->frame_code[i].stream_id = tmp_stream; 00258 nut->frame_code[i].size_mul = tmp_mul ; 00259 nut->frame_code[i].size_lsb = tmp_size+j; 00260 nut->frame_code[i].reserved_count = tmp_res ; 00261 nut->frame_code[i].header_idx = tmp_head_idx; 00262 } 00263 } 00264 assert(nut->frame_code['N'].flags == FLAG_INVALID); 00265 00266 if(end > avio_tell(bc) + 4){ 00267 int rem= 1024; 00268 GET_V(nut->header_count, tmp<128U) 00269 nut->header_count++; 00270 for(i=1; i<nut->header_count; i++){ 00271 GET_V(nut->header_len[i], tmp>0 && tmp<256); 00272 rem -= nut->header_len[i]; 00273 if(rem < 0){ 00274 av_log(s, AV_LOG_ERROR, "invalid elision header\n"); 00275 return AVERROR_INVALIDDATA; 00276 } 00277 nut->header[i]= av_malloc(nut->header_len[i]); 00278 avio_read(bc, nut->header[i], nut->header_len[i]); 00279 } 00280 assert(nut->header_len[0]==0); 00281 } 00282 00283 if(skip_reserved(bc, end) || ffio_get_checksum(bc)){ 00284 av_log(s, AV_LOG_ERROR, "main header checksum mismatch\n"); 00285 return AVERROR_INVALIDDATA; 00286 } 00287 00288 nut->stream = av_mallocz(sizeof(StreamContext)*stream_count); 00289 for(i=0; i<stream_count; i++){ 00290 av_new_stream(s, i); 00291 } 00292 00293 return 0; 00294 } 00295 00296 static int decode_stream_header(NUTContext *nut){ 00297 AVFormatContext *s= nut->avf; 00298 AVIOContext *bc = s->pb; 00299 StreamContext *stc; 00300 int class, stream_id; 00301 uint64_t tmp, end; 00302 AVStream *st; 00303 00304 end= get_packetheader(nut, bc, 1, STREAM_STARTCODE); 00305 end += avio_tell(bc); 00306 00307 GET_V(stream_id, tmp < s->nb_streams && !nut->stream[tmp].time_base); 00308 stc= &nut->stream[stream_id]; 00309 00310 st = s->streams[stream_id]; 00311 if (!st) 00312 return AVERROR(ENOMEM); 00313 00314 class = ffio_read_varlen(bc); 00315 tmp = get_fourcc(bc); 00316 st->codec->codec_tag= tmp; 00317 switch(class) 00318 { 00319 case 0: 00320 st->codec->codec_type = AVMEDIA_TYPE_VIDEO; 00321 st->codec->codec_id = av_codec_get_id( 00322 (const AVCodecTag * const []) { ff_codec_bmp_tags, ff_nut_video_tags, 0 }, 00323 tmp); 00324 break; 00325 case 1: 00326 st->codec->codec_type = AVMEDIA_TYPE_AUDIO; 00327 st->codec->codec_id = ff_codec_get_id(ff_codec_wav_tags, tmp); 00328 break; 00329 case 2: 00330 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE; 00331 st->codec->codec_id = ff_codec_get_id(ff_nut_subtitle_tags, tmp); 00332 break; 00333 case 3: 00334 st->codec->codec_type = AVMEDIA_TYPE_DATA; 00335 break; 00336 default: 00337 av_log(s, AV_LOG_ERROR, "unknown stream class (%d)\n", class); 00338 return -1; 00339 } 00340 if(class<3 && st->codec->codec_id == CODEC_ID_NONE) 00341 av_log(s, AV_LOG_ERROR, "Unknown codec tag '0x%04x' for stream number %d\n", 00342 (unsigned int)tmp, stream_id); 00343 00344 GET_V(stc->time_base_id , tmp < nut->time_base_count); 00345 GET_V(stc->msb_pts_shift , tmp < 16); 00346 stc->max_pts_distance= ffio_read_varlen(bc); 00347 GET_V(stc->decode_delay , tmp < 1000); //sanity limit, raise this if Moore's law is true 00348 st->codec->has_b_frames= stc->decode_delay; 00349 ffio_read_varlen(bc); //stream flags 00350 00351 GET_V(st->codec->extradata_size, tmp < (1<<30)); 00352 if(st->codec->extradata_size){ 00353 st->codec->extradata= av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE); 00354 avio_read(bc, st->codec->extradata, st->codec->extradata_size); 00355 } 00356 00357 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO){ 00358 GET_V(st->codec->width , tmp > 0) 00359 GET_V(st->codec->height, tmp > 0) 00360 st->sample_aspect_ratio.num= ffio_read_varlen(bc); 00361 st->sample_aspect_ratio.den= ffio_read_varlen(bc); 00362 if((!st->sample_aspect_ratio.num) != (!st->sample_aspect_ratio.den)){ 00363 av_log(s, AV_LOG_ERROR, "invalid aspect ratio %d/%d\n", st->sample_aspect_ratio.num, st->sample_aspect_ratio.den); 00364 return -1; 00365 } 00366 ffio_read_varlen(bc); /* csp type */ 00367 }else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO){ 00368 GET_V(st->codec->sample_rate , tmp > 0) 00369 ffio_read_varlen(bc); // samplerate_den 00370 GET_V(st->codec->channels, tmp > 0) 00371 } 00372 if(skip_reserved(bc, end) || ffio_get_checksum(bc)){ 00373 av_log(s, AV_LOG_ERROR, "stream header %d checksum mismatch\n", stream_id); 00374 return -1; 00375 } 00376 stc->time_base= &nut->time_base[stc->time_base_id]; 00377 av_set_pts_info(s->streams[stream_id], 63, stc->time_base->num, stc->time_base->den); 00378 return 0; 00379 } 00380 00381 static void set_disposition_bits(AVFormatContext* avf, char* value, int stream_id){ 00382 int flag = 0, i; 00383 for (i=0; ff_nut_dispositions[i].flag; ++i) { 00384 if (!strcmp(ff_nut_dispositions[i].str, value)) 00385 flag = ff_nut_dispositions[i].flag; 00386 } 00387 if (!flag) 00388 av_log(avf, AV_LOG_INFO, "unknown disposition type '%s'\n", value); 00389 for (i = 0; i < avf->nb_streams; ++i) 00390 if (stream_id == i || stream_id == -1) 00391 avf->streams[i]->disposition |= flag; 00392 } 00393 00394 static int decode_info_header(NUTContext *nut){ 00395 AVFormatContext *s= nut->avf; 00396 AVIOContext *bc = s->pb; 00397 uint64_t tmp, chapter_start, chapter_len; 00398 unsigned int stream_id_plus1, count; 00399 int chapter_id, i; 00400 int64_t value, end; 00401 char name[256], str_value[1024], type_str[256]; 00402 const char *type; 00403 AVChapter *chapter= NULL; 00404 AVStream *st= NULL; 00405 AVDictionary **metadata = NULL; 00406 00407 end= get_packetheader(nut, bc, 1, INFO_STARTCODE); 00408 end += avio_tell(bc); 00409 00410 GET_V(stream_id_plus1, tmp <= s->nb_streams) 00411 chapter_id = get_s(bc); 00412 chapter_start= ffio_read_varlen(bc); 00413 chapter_len = ffio_read_varlen(bc); 00414 count = ffio_read_varlen(bc); 00415 00416 if(chapter_id && !stream_id_plus1){ 00417 int64_t start= chapter_start / nut->time_base_count; 00418 chapter= ff_new_chapter(s, chapter_id, 00419 nut->time_base[chapter_start % nut->time_base_count], 00420 start, start + chapter_len, NULL); 00421 metadata = &chapter->metadata; 00422 } else if(stream_id_plus1) { 00423 st= s->streams[stream_id_plus1 - 1]; 00424 metadata = &st->metadata; 00425 } else 00426 metadata = &s->metadata; 00427 00428 for(i=0; i<count; i++){ 00429 get_str(bc, name, sizeof(name)); 00430 value= get_s(bc); 00431 if(value == -1){ 00432 type= "UTF-8"; 00433 get_str(bc, str_value, sizeof(str_value)); 00434 }else if(value == -2){ 00435 get_str(bc, type_str, sizeof(type_str)); 00436 type= type_str; 00437 get_str(bc, str_value, sizeof(str_value)); 00438 }else if(value == -3){ 00439 type= "s"; 00440 value= get_s(bc); 00441 }else if(value == -4){ 00442 type= "t"; 00443 value= ffio_read_varlen(bc); 00444 }else if(value < -4){ 00445 type= "r"; 00446 get_s(bc); 00447 }else{ 00448 type= "v"; 00449 } 00450 00451 if (stream_id_plus1 > s->nb_streams) { 00452 av_log(s, AV_LOG_ERROR, "invalid stream id for info packet\n"); 00453 continue; 00454 } 00455 00456 if(!strcmp(type, "UTF-8")){ 00457 if(chapter_id==0 && !strcmp(name, "Disposition")) { 00458 set_disposition_bits(s, str_value, stream_id_plus1 - 1); 00459 continue; 00460 } 00461 if(metadata && strcasecmp(name,"Uses") 00462 && strcasecmp(name,"Depends") && strcasecmp(name,"Replaces")) 00463 av_dict_set(metadata, name, str_value, 0); 00464 } 00465 } 00466 00467 if(skip_reserved(bc, end) || ffio_get_checksum(bc)){ 00468 av_log(s, AV_LOG_ERROR, "info header checksum mismatch\n"); 00469 return -1; 00470 } 00471 return 0; 00472 } 00473 00474 static int decode_syncpoint(NUTContext *nut, int64_t *ts, int64_t *back_ptr){ 00475 AVFormatContext *s= nut->avf; 00476 AVIOContext *bc = s->pb; 00477 int64_t end, tmp; 00478 00479 nut->last_syncpoint_pos= avio_tell(bc)-8; 00480 00481 end= get_packetheader(nut, bc, 1, SYNCPOINT_STARTCODE); 00482 end += avio_tell(bc); 00483 00484 tmp= ffio_read_varlen(bc); 00485 *back_ptr= nut->last_syncpoint_pos - 16*ffio_read_varlen(bc); 00486 if(*back_ptr < 0) 00487 return -1; 00488 00489 ff_nut_reset_ts(nut, nut->time_base[tmp % nut->time_base_count], tmp / nut->time_base_count); 00490 00491 if(skip_reserved(bc, end) || ffio_get_checksum(bc)){ 00492 av_log(s, AV_LOG_ERROR, "sync point checksum mismatch\n"); 00493 return -1; 00494 } 00495 00496 *ts= tmp / s->nb_streams * av_q2d(nut->time_base[tmp % s->nb_streams])*AV_TIME_BASE; 00497 ff_nut_add_sp(nut, nut->last_syncpoint_pos, *back_ptr, *ts); 00498 00499 return 0; 00500 } 00501 00502 static int find_and_decode_index(NUTContext *nut){ 00503 AVFormatContext *s= nut->avf; 00504 AVIOContext *bc = s->pb; 00505 uint64_t tmp, end; 00506 int i, j, syncpoint_count; 00507 int64_t filesize= avio_size(bc); 00508 int64_t *syncpoints; 00509 int8_t *has_keyframe; 00510 int ret= -1; 00511 00512 avio_seek(bc, filesize-12, SEEK_SET); 00513 avio_seek(bc, filesize-avio_rb64(bc), SEEK_SET); 00514 if(avio_rb64(bc) != INDEX_STARTCODE){ 00515 av_log(s, AV_LOG_ERROR, "no index at the end\n"); 00516 return -1; 00517 } 00518 00519 end= get_packetheader(nut, bc, 1, INDEX_STARTCODE); 00520 end += avio_tell(bc); 00521 00522 ffio_read_varlen(bc); //max_pts 00523 GET_V(syncpoint_count, tmp < INT_MAX/8 && tmp > 0) 00524 syncpoints= av_malloc(sizeof(int64_t)*syncpoint_count); 00525 has_keyframe= av_malloc(sizeof(int8_t)*(syncpoint_count+1)); 00526 for(i=0; i<syncpoint_count; i++){ 00527 syncpoints[i] = ffio_read_varlen(bc); 00528 if(syncpoints[i] <= 0) 00529 goto fail; 00530 if(i) 00531 syncpoints[i] += syncpoints[i-1]; 00532 } 00533 00534 for(i=0; i<s->nb_streams; i++){ 00535 int64_t last_pts= -1; 00536 for(j=0; j<syncpoint_count;){ 00537 uint64_t x= ffio_read_varlen(bc); 00538 int type= x&1; 00539 int n= j; 00540 x>>=1; 00541 if(type){ 00542 int flag= x&1; 00543 x>>=1; 00544 if(n+x >= syncpoint_count + 1){ 00545 av_log(s, AV_LOG_ERROR, "index overflow A\n"); 00546 goto fail; 00547 } 00548 while(x--) 00549 has_keyframe[n++]= flag; 00550 has_keyframe[n++]= !flag; 00551 }else{ 00552 while(x != 1){ 00553 if(n>=syncpoint_count + 1){ 00554 av_log(s, AV_LOG_ERROR, "index overflow B\n"); 00555 goto fail; 00556 } 00557 has_keyframe[n++]= x&1; 00558 x>>=1; 00559 } 00560 } 00561 if(has_keyframe[0]){ 00562 av_log(s, AV_LOG_ERROR, "keyframe before first syncpoint in index\n"); 00563 goto fail; 00564 } 00565 assert(n<=syncpoint_count+1); 00566 for(; j<n && j<syncpoint_count; j++){ 00567 if(has_keyframe[j]){ 00568 uint64_t B, A= ffio_read_varlen(bc); 00569 if(!A){ 00570 A= ffio_read_varlen(bc); 00571 B= ffio_read_varlen(bc); 00572 //eor_pts[j][i] = last_pts + A + B 00573 }else 00574 B= 0; 00575 av_add_index_entry( 00576 s->streams[i], 00577 16*syncpoints[j-1], 00578 last_pts + A, 00579 0, 00580 0, 00581 AVINDEX_KEYFRAME); 00582 last_pts += A + B; 00583 } 00584 } 00585 } 00586 } 00587 00588 if(skip_reserved(bc, end) || ffio_get_checksum(bc)){ 00589 av_log(s, AV_LOG_ERROR, "index checksum mismatch\n"); 00590 goto fail; 00591 } 00592 ret= 0; 00593 fail: 00594 av_free(syncpoints); 00595 av_free(has_keyframe); 00596 return ret; 00597 } 00598 00599 static int nut_read_header(AVFormatContext *s, AVFormatParameters *ap) 00600 { 00601 NUTContext *nut = s->priv_data; 00602 AVIOContext *bc = s->pb; 00603 int64_t pos; 00604 int initialized_stream_count; 00605 00606 nut->avf= s; 00607 00608 /* main header */ 00609 pos=0; 00610 do{ 00611 pos= find_startcode(bc, MAIN_STARTCODE, pos)+1; 00612 if (pos<0+1){ 00613 av_log(s, AV_LOG_ERROR, "No main startcode found.\n"); 00614 return AVERROR_INVALIDDATA; 00615 } 00616 }while(decode_main_header(nut) < 0); 00617 00618 /* stream headers */ 00619 pos=0; 00620 for(initialized_stream_count=0; initialized_stream_count < s->nb_streams;){ 00621 pos= find_startcode(bc, STREAM_STARTCODE, pos)+1; 00622 if (pos<0+1){ 00623 av_log(s, AV_LOG_ERROR, "Not all stream headers found.\n"); 00624 return AVERROR_INVALIDDATA; 00625 } 00626 if(decode_stream_header(nut) >= 0) 00627 initialized_stream_count++; 00628 } 00629 00630 /* info headers */ 00631 pos=0; 00632 for(;;){ 00633 uint64_t startcode= find_any_startcode(bc, pos); 00634 pos= avio_tell(bc); 00635 00636 if(startcode==0){ 00637 av_log(s, AV_LOG_ERROR, "EOF before video frames\n"); 00638 return AVERROR_INVALIDDATA; 00639 }else if(startcode == SYNCPOINT_STARTCODE){ 00640 nut->next_startcode= startcode; 00641 break; 00642 }else if(startcode != INFO_STARTCODE){ 00643 continue; 00644 } 00645 00646 decode_info_header(nut); 00647 } 00648 00649 s->data_offset= pos-8; 00650 00651 if(bc->seekable){ 00652 int64_t orig_pos= avio_tell(bc); 00653 find_and_decode_index(nut); 00654 avio_seek(bc, orig_pos, SEEK_SET); 00655 } 00656 assert(nut->next_startcode == SYNCPOINT_STARTCODE); 00657 00658 ff_metadata_conv_ctx(s, NULL, ff_nut_metadata_conv); 00659 00660 return 0; 00661 } 00662 00663 static int decode_frame_header(NUTContext *nut, int64_t *pts, int *stream_id, uint8_t *header_idx, int frame_code){ 00664 AVFormatContext *s= nut->avf; 00665 AVIOContext *bc = s->pb; 00666 StreamContext *stc; 00667 int size, flags, size_mul, pts_delta, i, reserved_count; 00668 uint64_t tmp; 00669 00670 if(avio_tell(bc) > nut->last_syncpoint_pos + nut->max_distance){ 00671 av_log(s, AV_LOG_ERROR, "Last frame must have been damaged %"PRId64" > %"PRId64" + %d\n", avio_tell(bc), nut->last_syncpoint_pos, nut->max_distance); 00672 return AVERROR_INVALIDDATA; 00673 } 00674 00675 flags = nut->frame_code[frame_code].flags; 00676 size_mul = nut->frame_code[frame_code].size_mul; 00677 size = nut->frame_code[frame_code].size_lsb; 00678 *stream_id = nut->frame_code[frame_code].stream_id; 00679 pts_delta = nut->frame_code[frame_code].pts_delta; 00680 reserved_count = nut->frame_code[frame_code].reserved_count; 00681 *header_idx = nut->frame_code[frame_code].header_idx; 00682 00683 if(flags & FLAG_INVALID) 00684 return AVERROR_INVALIDDATA; 00685 if(flags & FLAG_CODED) 00686 flags ^= ffio_read_varlen(bc); 00687 if(flags & FLAG_STREAM_ID){ 00688 GET_V(*stream_id, tmp < s->nb_streams) 00689 } 00690 stc= &nut->stream[*stream_id]; 00691 if(flags&FLAG_CODED_PTS){ 00692 int coded_pts= ffio_read_varlen(bc); 00693 //FIXME check last_pts validity? 00694 if(coded_pts < (1<<stc->msb_pts_shift)){ 00695 *pts=ff_lsb2full(stc, coded_pts); 00696 }else 00697 *pts=coded_pts - (1<<stc->msb_pts_shift); 00698 }else 00699 *pts= stc->last_pts + pts_delta; 00700 if(flags&FLAG_SIZE_MSB){ 00701 size += size_mul*ffio_read_varlen(bc); 00702 } 00703 if(flags&FLAG_MATCH_TIME) 00704 get_s(bc); 00705 if(flags&FLAG_HEADER_IDX) 00706 *header_idx= ffio_read_varlen(bc); 00707 if(flags&FLAG_RESERVED) 00708 reserved_count= ffio_read_varlen(bc); 00709 for(i=0; i<reserved_count; i++) 00710 ffio_read_varlen(bc); 00711 00712 if(*header_idx >= (unsigned)nut->header_count){ 00713 av_log(s, AV_LOG_ERROR, "header_idx invalid\n"); 00714 return AVERROR_INVALIDDATA; 00715 } 00716 if(size > 4096) 00717 *header_idx=0; 00718 size -= nut->header_len[*header_idx]; 00719 00720 if(flags&FLAG_CHECKSUM){ 00721 avio_rb32(bc); //FIXME check this 00722 }else if(size > 2*nut->max_distance || FFABS(stc->last_pts - *pts) > stc->max_pts_distance){ 00723 av_log(s, AV_LOG_ERROR, "frame size > 2max_distance and no checksum\n"); 00724 return AVERROR_INVALIDDATA; 00725 } 00726 00727 stc->last_pts= *pts; 00728 stc->last_flags= flags; 00729 00730 return size; 00731 } 00732 00733 static int decode_frame(NUTContext *nut, AVPacket *pkt, int frame_code){ 00734 AVFormatContext *s= nut->avf; 00735 AVIOContext *bc = s->pb; 00736 int size, stream_id, discard; 00737 int64_t pts, last_IP_pts; 00738 StreamContext *stc; 00739 uint8_t header_idx; 00740 00741 size= decode_frame_header(nut, &pts, &stream_id, &header_idx, frame_code); 00742 if(size < 0) 00743 return size; 00744 00745 stc= &nut->stream[stream_id]; 00746 00747 if (stc->last_flags & FLAG_KEY) 00748 stc->skip_until_key_frame=0; 00749 00750 discard= s->streams[ stream_id ]->discard; 00751 last_IP_pts= s->streams[ stream_id ]->last_IP_pts; 00752 if( (discard >= AVDISCARD_NONKEY && !(stc->last_flags & FLAG_KEY)) 00753 ||(discard >= AVDISCARD_BIDIR && last_IP_pts != AV_NOPTS_VALUE && last_IP_pts > pts) 00754 || discard >= AVDISCARD_ALL 00755 || stc->skip_until_key_frame){ 00756 avio_skip(bc, size); 00757 return 1; 00758 } 00759 00760 av_new_packet(pkt, size + nut->header_len[header_idx]); 00761 memcpy(pkt->data, nut->header[header_idx], nut->header_len[header_idx]); 00762 pkt->pos= avio_tell(bc); //FIXME 00763 avio_read(bc, pkt->data + nut->header_len[header_idx], size); 00764 00765 pkt->stream_index = stream_id; 00766 if (stc->last_flags & FLAG_KEY) 00767 pkt->flags |= AV_PKT_FLAG_KEY; 00768 pkt->pts = pts; 00769 00770 return 0; 00771 } 00772 00773 static int nut_read_packet(AVFormatContext *s, AVPacket *pkt) 00774 { 00775 NUTContext *nut = s->priv_data; 00776 AVIOContext *bc = s->pb; 00777 int i, frame_code=0, ret, skip; 00778 int64_t ts, back_ptr; 00779 00780 for(;;){ 00781 int64_t pos= avio_tell(bc); 00782 uint64_t tmp= nut->next_startcode; 00783 nut->next_startcode=0; 00784 00785 if(tmp){ 00786 pos-=8; 00787 }else{ 00788 frame_code = avio_r8(bc); 00789 if(bc->eof_reached) 00790 return -1; 00791 if(frame_code == 'N'){ 00792 tmp= frame_code; 00793 for(i=1; i<8; i++) 00794 tmp = (tmp<<8) + avio_r8(bc); 00795 } 00796 } 00797 switch(tmp){ 00798 case MAIN_STARTCODE: 00799 case STREAM_STARTCODE: 00800 case INDEX_STARTCODE: 00801 skip= get_packetheader(nut, bc, 0, tmp); 00802 avio_skip(bc, skip); 00803 break; 00804 case INFO_STARTCODE: 00805 if(decode_info_header(nut)<0) 00806 goto resync; 00807 break; 00808 case SYNCPOINT_STARTCODE: 00809 if(decode_syncpoint(nut, &ts, &back_ptr)<0) 00810 goto resync; 00811 frame_code = avio_r8(bc); 00812 case 0: 00813 ret= decode_frame(nut, pkt, frame_code); 00814 if(ret==0) 00815 return 0; 00816 else if(ret==1) //ok but discard packet 00817 break; 00818 default: 00819 resync: 00820 av_log(s, AV_LOG_DEBUG, "syncing from %"PRId64"\n", pos); 00821 tmp= find_any_startcode(bc, nut->last_syncpoint_pos+1); 00822 if(tmp==0) 00823 return AVERROR_INVALIDDATA; 00824 av_log(s, AV_LOG_DEBUG, "sync\n"); 00825 nut->next_startcode= tmp; 00826 } 00827 } 00828 } 00829 00830 static int64_t nut_read_timestamp(AVFormatContext *s, int stream_index, int64_t *pos_arg, int64_t pos_limit){ 00831 NUTContext *nut = s->priv_data; 00832 AVIOContext *bc = s->pb; 00833 int64_t pos, pts, back_ptr; 00834 av_log(s, AV_LOG_DEBUG, "read_timestamp(X,%d,%"PRId64",%"PRId64")\n", stream_index, *pos_arg, pos_limit); 00835 00836 pos= *pos_arg; 00837 do{ 00838 pos= find_startcode(bc, SYNCPOINT_STARTCODE, pos)+1; 00839 if(pos < 1){ 00840 assert(nut->next_startcode == 0); 00841 av_log(s, AV_LOG_ERROR, "read_timestamp failed.\n"); 00842 return AV_NOPTS_VALUE; 00843 } 00844 }while(decode_syncpoint(nut, &pts, &back_ptr) < 0); 00845 *pos_arg = pos-1; 00846 assert(nut->last_syncpoint_pos == *pos_arg); 00847 00848 av_log(s, AV_LOG_DEBUG, "return %"PRId64" %"PRId64"\n", pts,back_ptr ); 00849 if (stream_index == -1) return pts; 00850 else if(stream_index == -2) return back_ptr; 00851 00852 assert(0); 00853 } 00854 00855 static int read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags){ 00856 NUTContext *nut = s->priv_data; 00857 AVStream *st= s->streams[stream_index]; 00858 Syncpoint dummy={.ts= pts*av_q2d(st->time_base)*AV_TIME_BASE}; 00859 Syncpoint nopts_sp= {.ts= AV_NOPTS_VALUE, .back_ptr= AV_NOPTS_VALUE}; 00860 Syncpoint *sp, *next_node[2]= {&nopts_sp, &nopts_sp}; 00861 int64_t pos, pos2, ts; 00862 int i; 00863 00864 if(st->index_entries){ 00865 int index= av_index_search_timestamp(st, pts, flags); 00866 if(index<0) 00867 return -1; 00868 00869 pos2= st->index_entries[index].pos; 00870 ts = st->index_entries[index].timestamp; 00871 }else{ 00872 av_tree_find(nut->syncpoints, &dummy, (void *) ff_nut_sp_pts_cmp, 00873 (void **) next_node); 00874 av_log(s, AV_LOG_DEBUG, "%"PRIu64"-%"PRIu64" %"PRId64"-%"PRId64"\n", next_node[0]->pos, next_node[1]->pos, 00875 next_node[0]->ts , next_node[1]->ts); 00876 pos= av_gen_search(s, -1, dummy.ts, next_node[0]->pos, next_node[1]->pos, next_node[1]->pos, 00877 next_node[0]->ts , next_node[1]->ts, AVSEEK_FLAG_BACKWARD, &ts, nut_read_timestamp); 00878 00879 if(!(flags & AVSEEK_FLAG_BACKWARD)){ 00880 dummy.pos= pos+16; 00881 next_node[1]= &nopts_sp; 00882 av_tree_find(nut->syncpoints, &dummy, (void *) ff_nut_sp_pos_cmp, 00883 (void **) next_node); 00884 pos2= av_gen_search(s, -2, dummy.pos, next_node[0]->pos , next_node[1]->pos, next_node[1]->pos, 00885 next_node[0]->back_ptr, next_node[1]->back_ptr, flags, &ts, nut_read_timestamp); 00886 if(pos2>=0) 00887 pos= pos2; 00888 //FIXME dir but I think it does not matter 00889 } 00890 dummy.pos= pos; 00891 sp= av_tree_find(nut->syncpoints, &dummy, (void *) ff_nut_sp_pos_cmp, 00892 NULL); 00893 00894 assert(sp); 00895 pos2= sp->back_ptr - 15; 00896 } 00897 av_log(NULL, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos2); 00898 pos= find_startcode(s->pb, SYNCPOINT_STARTCODE, pos2); 00899 avio_seek(s->pb, pos, SEEK_SET); 00900 av_log(NULL, AV_LOG_DEBUG, "SP: %"PRId64"\n", pos); 00901 if(pos2 > pos || pos2 + 15 < pos){ 00902 av_log(NULL, AV_LOG_ERROR, "no syncpoint at backptr pos\n"); 00903 } 00904 for(i=0; i<s->nb_streams; i++) 00905 nut->stream[i].skip_until_key_frame=1; 00906 00907 return 0; 00908 } 00909 00910 static int nut_read_close(AVFormatContext *s) 00911 { 00912 NUTContext *nut = s->priv_data; 00913 int i; 00914 00915 av_freep(&nut->time_base); 00916 av_freep(&nut->stream); 00917 ff_nut_free_sp(nut); 00918 for(i = 1; i < nut->header_count; i++) 00919 av_freep(&nut->header[i]); 00920 00921 return 0; 00922 } 00923 00924 #if CONFIG_NUT_DEMUXER 00925 AVInputFormat ff_nut_demuxer = { 00926 "nut", 00927 NULL_IF_CONFIG_SMALL("NUT format"), 00928 sizeof(NUTContext), 00929 nut_probe, 00930 nut_read_header, 00931 nut_read_packet, 00932 nut_read_close, 00933 read_seek, 00934 .extensions = "nut", 00935 .codec_tag = (const AVCodecTag * const []) { ff_codec_bmp_tags, ff_nut_video_tags, ff_codec_wav_tags, ff_nut_subtitle_tags, 0 }, 00936 }; 00937 #endif