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00023 #include "libavutil/avstring.h"
00024 #include "libavutil/bswap.h"
00025 #include "libavutil/dict.h"
00026 #include "libavutil/mathematics.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
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 #define ffio_read_varlen(bc) get_v_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__)
00085 #define get_s(bc) get_s_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__)
00086 #endif
00087
00088 static int get_packetheader(NUTContext *nut, AVIOContext *bc, int calculate_checksum, uint64_t startcode)
00089 {
00090 int64_t size;
00091
00092
00093 startcode= av_be2ne64(startcode);
00094 startcode= ff_crc04C11DB7_update(0, (uint8_t*)&startcode, 8);
00095
00096 ffio_init_checksum(bc, ff_crc04C11DB7_update, startcode);
00097 size= ffio_read_varlen(bc);
00098 if(size > 4096)
00099 avio_rb32(bc);
00100 if(ffio_get_checksum(bc) && size > 4096)
00101 return -1;
00102
00103 ffio_init_checksum(bc, calculate_checksum ? ff_crc04C11DB7_update : NULL, 0);
00104
00105 return size;
00106 }
00107
00108 static uint64_t find_any_startcode(AVIOContext *bc, int64_t pos){
00109 uint64_t state=0;
00110
00111 if(pos >= 0)
00112 avio_seek(bc, pos, SEEK_SET);
00113
00114 while(!bc->eof_reached){
00115 state= (state<<8) | avio_r8(bc);
00116 if((state>>56) != 'N')
00117 continue;
00118 switch(state){
00119 case MAIN_STARTCODE:
00120 case STREAM_STARTCODE:
00121 case SYNCPOINT_STARTCODE:
00122 case INFO_STARTCODE:
00123 case INDEX_STARTCODE:
00124 return state;
00125 }
00126 }
00127
00128 return 0;
00129 }
00130
00137 static int64_t find_startcode(AVIOContext *bc, uint64_t code, int64_t pos){
00138 for(;;){
00139 uint64_t startcode= find_any_startcode(bc, pos);
00140 if(startcode == code)
00141 return avio_tell(bc) - 8;
00142 else if(startcode == 0)
00143 return -1;
00144 pos=-1;
00145 }
00146 }
00147
00148 static int nut_probe(AVProbeData *p){
00149 int i;
00150 uint64_t code= 0;
00151
00152 for (i = 0; i < p->buf_size; i++) {
00153 code = (code << 8) | p->buf[i];
00154 if (code == MAIN_STARTCODE)
00155 return AVPROBE_SCORE_MAX;
00156 }
00157 return 0;
00158 }
00159
00160 #define GET_V(dst, check) \
00161 tmp= ffio_read_varlen(bc);\
00162 if(!(check)){\
00163 av_log(s, AV_LOG_ERROR, "Error " #dst " is (%"PRId64")\n", tmp);\
00164 return -1;\
00165 }\
00166 dst= tmp;
00167
00168 static int skip_reserved(AVIOContext *bc, int64_t pos){
00169 pos -= avio_tell(bc);
00170 if(pos<0){
00171 avio_seek(bc, pos, SEEK_CUR);
00172 return -1;
00173 }else{
00174 while(pos--)
00175 avio_r8(bc);
00176 return 0;
00177 }
00178 }
00179
00180 static int decode_main_header(NUTContext *nut){
00181 AVFormatContext *s= nut->avf;
00182 AVIOContext *bc = s->pb;
00183 uint64_t tmp, end;
00184 unsigned int stream_count;
00185 int i, j, tmp_stream, tmp_mul, tmp_pts, tmp_size, count, tmp_res, tmp_head_idx;
00186
00187 end= get_packetheader(nut, bc, 1, MAIN_STARTCODE);
00188 end += avio_tell(bc);
00189
00190 GET_V(tmp , tmp >=2 && tmp <= 3)
00191 GET_V(stream_count , tmp > 0 && tmp <= NUT_MAX_STREAMS)
00192
00193 nut->max_distance = ffio_read_varlen(bc);
00194 if(nut->max_distance > 65536){
00195 av_log(s, AV_LOG_DEBUG, "max_distance %d\n", nut->max_distance);
00196 nut->max_distance= 65536;
00197 }
00198
00199 GET_V(nut->time_base_count, tmp>0 && tmp<INT_MAX / sizeof(AVRational))
00200 nut->time_base= av_malloc(nut->time_base_count * sizeof(AVRational));
00201
00202 for(i=0; i<nut->time_base_count; i++){
00203 GET_V(nut->time_base[i].num, tmp>0 && tmp<(1ULL<<31))
00204 GET_V(nut->time_base[i].den, tmp>0 && tmp<(1ULL<<31))
00205 if(av_gcd(nut->time_base[i].num, nut->time_base[i].den) != 1){
00206 av_log(s, AV_LOG_ERROR, "time base invalid\n");
00207 return AVERROR_INVALIDDATA;
00208 }
00209 }
00210 tmp_pts=0;
00211 tmp_mul=1;
00212 tmp_stream=0;
00213 tmp_head_idx= 0;
00214 for(i=0; i<256;){
00215 int tmp_flags = ffio_read_varlen(bc);
00216 int tmp_fields= ffio_read_varlen(bc);
00217 if(tmp_fields>0) tmp_pts = get_s(bc);
00218 if(tmp_fields>1) tmp_mul = ffio_read_varlen(bc);
00219 if(tmp_fields>2) tmp_stream= ffio_read_varlen(bc);
00220 if(tmp_fields>3) tmp_size = ffio_read_varlen(bc);
00221 else tmp_size = 0;
00222 if(tmp_fields>4) tmp_res = ffio_read_varlen(bc);
00223 else tmp_res = 0;
00224 if(tmp_fields>5) count = ffio_read_varlen(bc);
00225 else count = tmp_mul - tmp_size;
00226 if(tmp_fields>6) get_s(bc);
00227 if(tmp_fields>7) tmp_head_idx= ffio_read_varlen(bc);
00228
00229 while(tmp_fields-- > 8)
00230 ffio_read_varlen(bc);
00231
00232 if(count == 0 || i+count > 256){
00233 av_log(s, AV_LOG_ERROR, "illegal count %d at %d\n", count, i);
00234 return AVERROR_INVALIDDATA;
00235 }
00236 if(tmp_stream >= stream_count){
00237 av_log(s, AV_LOG_ERROR, "illegal stream number\n");
00238 return AVERROR_INVALIDDATA;
00239 }
00240
00241 for(j=0; j<count; j++,i++){
00242 if (i == 'N') {
00243 nut->frame_code[i].flags= FLAG_INVALID;
00244 j--;
00245 continue;
00246 }
00247 nut->frame_code[i].flags = tmp_flags ;
00248 nut->frame_code[i].pts_delta = tmp_pts ;
00249 nut->frame_code[i].stream_id = tmp_stream;
00250 nut->frame_code[i].size_mul = tmp_mul ;
00251 nut->frame_code[i].size_lsb = tmp_size+j;
00252 nut->frame_code[i].reserved_count = tmp_res ;
00253 nut->frame_code[i].header_idx = tmp_head_idx;
00254 }
00255 }
00256 assert(nut->frame_code['N'].flags == FLAG_INVALID);
00257
00258 if(end > avio_tell(bc) + 4){
00259 int rem= 1024;
00260 GET_V(nut->header_count, tmp<128U)
00261 nut->header_count++;
00262 for(i=1; i<nut->header_count; i++){
00263 GET_V(nut->header_len[i], tmp>0 && tmp<256);
00264 rem -= nut->header_len[i];
00265 if(rem < 0){
00266 av_log(s, AV_LOG_ERROR, "invalid elision header\n");
00267 return AVERROR_INVALIDDATA;
00268 }
00269 nut->header[i]= av_malloc(nut->header_len[i]);
00270 avio_read(bc, nut->header[i], nut->header_len[i]);
00271 }
00272 assert(nut->header_len[0]==0);
00273 }
00274
00275 if(skip_reserved(bc, end) || ffio_get_checksum(bc)){
00276 av_log(s, AV_LOG_ERROR, "main header checksum mismatch\n");
00277 return AVERROR_INVALIDDATA;
00278 }
00279
00280 nut->stream = av_mallocz(sizeof(StreamContext)*stream_count);
00281 for(i=0; i<stream_count; i++){
00282 avformat_new_stream(s, NULL);
00283 }
00284
00285 return 0;
00286 }
00287
00288 static int decode_stream_header(NUTContext *nut){
00289 AVFormatContext *s= nut->avf;
00290 AVIOContext *bc = s->pb;
00291 StreamContext *stc;
00292 int class, stream_id;
00293 uint64_t tmp, end;
00294 AVStream *st;
00295
00296 end= get_packetheader(nut, bc, 1, STREAM_STARTCODE);
00297 end += avio_tell(bc);
00298
00299 GET_V(stream_id, tmp < s->nb_streams && !nut->stream[tmp].time_base);
00300 stc= &nut->stream[stream_id];
00301
00302 st = s->streams[stream_id];
00303 if (!st)
00304 return AVERROR(ENOMEM);
00305
00306 class = ffio_read_varlen(bc);
00307 tmp = get_fourcc(bc);
00308 st->codec->codec_tag= tmp;
00309 switch(class)
00310 {
00311 case 0:
00312 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
00313 st->codec->codec_id = av_codec_get_id(
00314 (const AVCodecTag * const []) { ff_codec_bmp_tags, ff_nut_video_tags, 0 },
00315 tmp);
00316 break;
00317 case 1:
00318 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
00319 st->codec->codec_id = ff_codec_get_id(ff_codec_wav_tags, tmp);
00320 break;
00321 case 2:
00322 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
00323 st->codec->codec_id = ff_codec_get_id(ff_nut_subtitle_tags, tmp);
00324 break;
00325 case 3:
00326 st->codec->codec_type = AVMEDIA_TYPE_DATA;
00327 break;
00328 default:
00329 av_log(s, AV_LOG_ERROR, "unknown stream class (%d)\n", class);
00330 return -1;
00331 }
00332 if(class<3 && st->codec->codec_id == CODEC_ID_NONE)
00333 av_log(s, AV_LOG_ERROR, "Unknown codec tag '0x%04x' for stream number %d\n",
00334 (unsigned int)tmp, stream_id);
00335
00336 GET_V(stc->time_base_id , tmp < nut->time_base_count);
00337 GET_V(stc->msb_pts_shift , tmp < 16);
00338 stc->max_pts_distance= ffio_read_varlen(bc);
00339 GET_V(stc->decode_delay , tmp < 1000);
00340 st->codec->has_b_frames= stc->decode_delay;
00341 ffio_read_varlen(bc);
00342
00343 GET_V(st->codec->extradata_size, tmp < (1<<30));
00344 if(st->codec->extradata_size){
00345 st->codec->extradata= av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
00346 avio_read(bc, st->codec->extradata, st->codec->extradata_size);
00347 }
00348
00349 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO){
00350 GET_V(st->codec->width , tmp > 0)
00351 GET_V(st->codec->height, tmp > 0)
00352 st->sample_aspect_ratio.num= ffio_read_varlen(bc);
00353 st->sample_aspect_ratio.den= ffio_read_varlen(bc);
00354 if((!st->sample_aspect_ratio.num) != (!st->sample_aspect_ratio.den)){
00355 av_log(s, AV_LOG_ERROR, "invalid aspect ratio %d/%d\n", st->sample_aspect_ratio.num, st->sample_aspect_ratio.den);
00356 return -1;
00357 }
00358 ffio_read_varlen(bc);
00359 }else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO){
00360 GET_V(st->codec->sample_rate , tmp > 0)
00361 ffio_read_varlen(bc);
00362 GET_V(st->codec->channels, tmp > 0)
00363 }
00364 if(skip_reserved(bc, end) || ffio_get_checksum(bc)){
00365 av_log(s, AV_LOG_ERROR, "stream header %d checksum mismatch\n", stream_id);
00366 return -1;
00367 }
00368 stc->time_base= &nut->time_base[stc->time_base_id];
00369 avpriv_set_pts_info(s->streams[stream_id], 63, stc->time_base->num, stc->time_base->den);
00370 return 0;
00371 }
00372
00373 static void set_disposition_bits(AVFormatContext* avf, char* value, int stream_id){
00374 int flag = 0, i;
00375 for (i=0; ff_nut_dispositions[i].flag; ++i) {
00376 if (!strcmp(ff_nut_dispositions[i].str, value))
00377 flag = ff_nut_dispositions[i].flag;
00378 }
00379 if (!flag)
00380 av_log(avf, AV_LOG_INFO, "unknown disposition type '%s'\n", value);
00381 for (i = 0; i < avf->nb_streams; ++i)
00382 if (stream_id == i || stream_id == -1)
00383 avf->streams[i]->disposition |= flag;
00384 }
00385
00386 static int decode_info_header(NUTContext *nut){
00387 AVFormatContext *s= nut->avf;
00388 AVIOContext *bc = s->pb;
00389 uint64_t tmp, chapter_start, chapter_len;
00390 unsigned int stream_id_plus1, count;
00391 int chapter_id, i;
00392 int64_t value, end;
00393 char name[256], str_value[1024], type_str[256];
00394 const char *type;
00395 AVChapter *chapter= NULL;
00396 AVStream *st= NULL;
00397 AVDictionary **metadata = NULL;
00398
00399 end= get_packetheader(nut, bc, 1, INFO_STARTCODE);
00400 end += avio_tell(bc);
00401
00402 GET_V(stream_id_plus1, tmp <= s->nb_streams)
00403 chapter_id = get_s(bc);
00404 chapter_start= ffio_read_varlen(bc);
00405 chapter_len = ffio_read_varlen(bc);
00406 count = ffio_read_varlen(bc);
00407
00408 if(chapter_id && !stream_id_plus1){
00409 int64_t start= chapter_start / nut->time_base_count;
00410 chapter= avpriv_new_chapter(s, chapter_id,
00411 nut->time_base[chapter_start % nut->time_base_count],
00412 start, start + chapter_len, NULL);
00413 metadata = &chapter->metadata;
00414 } else if(stream_id_plus1) {
00415 st= s->streams[stream_id_plus1 - 1];
00416 metadata = &st->metadata;
00417 } else
00418 metadata = &s->metadata;
00419
00420 for(i=0; i<count; i++){
00421 get_str(bc, name, sizeof(name));
00422 value= get_s(bc);
00423 if(value == -1){
00424 type= "UTF-8";
00425 get_str(bc, str_value, sizeof(str_value));
00426 }else if(value == -2){
00427 get_str(bc, type_str, sizeof(type_str));
00428 type= type_str;
00429 get_str(bc, str_value, sizeof(str_value));
00430 }else if(value == -3){
00431 type= "s";
00432 value= get_s(bc);
00433 }else if(value == -4){
00434 type= "t";
00435 value= ffio_read_varlen(bc);
00436 }else if(value < -4){
00437 type= "r";
00438 get_s(bc);
00439 }else{
00440 type= "v";
00441 }
00442
00443 if (stream_id_plus1 > s->nb_streams) {
00444 av_log(s, AV_LOG_ERROR, "invalid stream id for info packet\n");
00445 continue;
00446 }
00447
00448 if(!strcmp(type, "UTF-8")){
00449 if(chapter_id==0 && !strcmp(name, "Disposition")) {
00450 set_disposition_bits(s, str_value, stream_id_plus1 - 1);
00451 continue;
00452 }
00453 if(metadata && av_strcasecmp(name,"Uses")
00454 && av_strcasecmp(name,"Depends") && av_strcasecmp(name,"Replaces"))
00455 av_dict_set(metadata, name, str_value, 0);
00456 }
00457 }
00458
00459 if(skip_reserved(bc, end) || ffio_get_checksum(bc)){
00460 av_log(s, AV_LOG_ERROR, "info header checksum mismatch\n");
00461 return -1;
00462 }
00463 return 0;
00464 }
00465
00466 static int decode_syncpoint(NUTContext *nut, int64_t *ts, int64_t *back_ptr){
00467 AVFormatContext *s= nut->avf;
00468 AVIOContext *bc = s->pb;
00469 int64_t end, tmp;
00470
00471 nut->last_syncpoint_pos= avio_tell(bc)-8;
00472
00473 end= get_packetheader(nut, bc, 1, SYNCPOINT_STARTCODE);
00474 end += avio_tell(bc);
00475
00476 tmp= ffio_read_varlen(bc);
00477 *back_ptr= nut->last_syncpoint_pos - 16*ffio_read_varlen(bc);
00478 if(*back_ptr < 0)
00479 return -1;
00480
00481 ff_nut_reset_ts(nut, nut->time_base[tmp % nut->time_base_count], tmp / nut->time_base_count);
00482
00483 if(skip_reserved(bc, end) || ffio_get_checksum(bc)){
00484 av_log(s, AV_LOG_ERROR, "sync point checksum mismatch\n");
00485 return -1;
00486 }
00487
00488 *ts= tmp / s->nb_streams * av_q2d(nut->time_base[tmp % s->nb_streams])*AV_TIME_BASE;
00489 ff_nut_add_sp(nut, nut->last_syncpoint_pos, *back_ptr, *ts);
00490
00491 return 0;
00492 }
00493
00494 static int find_and_decode_index(NUTContext *nut){
00495 AVFormatContext *s= nut->avf;
00496 AVIOContext *bc = s->pb;
00497 uint64_t tmp, end;
00498 int i, j, syncpoint_count;
00499 int64_t filesize= avio_size(bc);
00500 int64_t *syncpoints;
00501 int8_t *has_keyframe;
00502 int ret= -1;
00503
00504 avio_seek(bc, filesize-12, SEEK_SET);
00505 avio_seek(bc, filesize-avio_rb64(bc), SEEK_SET);
00506 if(avio_rb64(bc) != INDEX_STARTCODE){
00507 av_log(s, AV_LOG_ERROR, "no index at the end\n");
00508 return -1;
00509 }
00510
00511 end= get_packetheader(nut, bc, 1, INDEX_STARTCODE);
00512 end += avio_tell(bc);
00513
00514 ffio_read_varlen(bc);
00515 GET_V(syncpoint_count, tmp < INT_MAX/8 && tmp > 0)
00516 syncpoints= av_malloc(sizeof(int64_t)*syncpoint_count);
00517 has_keyframe= av_malloc(sizeof(int8_t)*(syncpoint_count+1));
00518 for(i=0; i<syncpoint_count; i++){
00519 syncpoints[i] = ffio_read_varlen(bc);
00520 if(syncpoints[i] <= 0)
00521 goto fail;
00522 if(i)
00523 syncpoints[i] += syncpoints[i-1];
00524 }
00525
00526 for(i=0; i<s->nb_streams; i++){
00527 int64_t last_pts= -1;
00528 for(j=0; j<syncpoint_count;){
00529 uint64_t x= ffio_read_varlen(bc);
00530 int type= x&1;
00531 int n= j;
00532 x>>=1;
00533 if(type){
00534 int flag= x&1;
00535 x>>=1;
00536 if(n+x >= syncpoint_count + 1){
00537 av_log(s, AV_LOG_ERROR, "index overflow A\n");
00538 goto fail;
00539 }
00540 while(x--)
00541 has_keyframe[n++]= flag;
00542 has_keyframe[n++]= !flag;
00543 }else{
00544 while(x != 1){
00545 if(n>=syncpoint_count + 1){
00546 av_log(s, AV_LOG_ERROR, "index overflow B\n");
00547 goto fail;
00548 }
00549 has_keyframe[n++]= x&1;
00550 x>>=1;
00551 }
00552 }
00553 if(has_keyframe[0]){
00554 av_log(s, AV_LOG_ERROR, "keyframe before first syncpoint in index\n");
00555 goto fail;
00556 }
00557 assert(n<=syncpoint_count+1);
00558 for(; j<n && j<syncpoint_count; j++){
00559 if(has_keyframe[j]){
00560 uint64_t B, A= ffio_read_varlen(bc);
00561 if(!A){
00562 A= ffio_read_varlen(bc);
00563 B= ffio_read_varlen(bc);
00564
00565 }else
00566 B= 0;
00567 av_add_index_entry(
00568 s->streams[i],
00569 16*syncpoints[j-1],
00570 last_pts + A,
00571 0,
00572 0,
00573 AVINDEX_KEYFRAME);
00574 last_pts += A + B;
00575 }
00576 }
00577 }
00578 }
00579
00580 if(skip_reserved(bc, end) || ffio_get_checksum(bc)){
00581 av_log(s, AV_LOG_ERROR, "index checksum mismatch\n");
00582 goto fail;
00583 }
00584 ret= 0;
00585 fail:
00586 av_free(syncpoints);
00587 av_free(has_keyframe);
00588 return ret;
00589 }
00590
00591 static int nut_read_header(AVFormatContext *s, AVFormatParameters *ap)
00592 {
00593 NUTContext *nut = s->priv_data;
00594 AVIOContext *bc = s->pb;
00595 int64_t pos;
00596 int initialized_stream_count;
00597
00598 nut->avf= s;
00599
00600
00601 pos=0;
00602 do{
00603 pos= find_startcode(bc, MAIN_STARTCODE, pos)+1;
00604 if (pos<0+1){
00605 av_log(s, AV_LOG_ERROR, "No main startcode found.\n");
00606 return AVERROR_INVALIDDATA;
00607 }
00608 }while(decode_main_header(nut) < 0);
00609
00610
00611 pos=0;
00612 for(initialized_stream_count=0; initialized_stream_count < s->nb_streams;){
00613 pos= find_startcode(bc, STREAM_STARTCODE, pos)+1;
00614 if (pos<0+1){
00615 av_log(s, AV_LOG_ERROR, "Not all stream headers found.\n");
00616 return AVERROR_INVALIDDATA;
00617 }
00618 if(decode_stream_header(nut) >= 0)
00619 initialized_stream_count++;
00620 }
00621
00622
00623 pos=0;
00624 for(;;){
00625 uint64_t startcode= find_any_startcode(bc, pos);
00626 pos= avio_tell(bc);
00627
00628 if(startcode==0){
00629 av_log(s, AV_LOG_ERROR, "EOF before video frames\n");
00630 return AVERROR_INVALIDDATA;
00631 }else if(startcode == SYNCPOINT_STARTCODE){
00632 nut->next_startcode= startcode;
00633 break;
00634 }else if(startcode != INFO_STARTCODE){
00635 continue;
00636 }
00637
00638 decode_info_header(nut);
00639 }
00640
00641 s->data_offset= pos-8;
00642
00643 if(bc->seekable){
00644 int64_t orig_pos= avio_tell(bc);
00645 find_and_decode_index(nut);
00646 avio_seek(bc, orig_pos, SEEK_SET);
00647 }
00648 assert(nut->next_startcode == SYNCPOINT_STARTCODE);
00649
00650 ff_metadata_conv_ctx(s, NULL, ff_nut_metadata_conv);
00651
00652 return 0;
00653 }
00654
00655 static int decode_frame_header(NUTContext *nut, int64_t *pts, int *stream_id, uint8_t *header_idx, int frame_code){
00656 AVFormatContext *s= nut->avf;
00657 AVIOContext *bc = s->pb;
00658 StreamContext *stc;
00659 int size, flags, size_mul, pts_delta, i, reserved_count;
00660 uint64_t tmp;
00661
00662 if(avio_tell(bc) > nut->last_syncpoint_pos + nut->max_distance){
00663 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);
00664 return AVERROR_INVALIDDATA;
00665 }
00666
00667 flags = nut->frame_code[frame_code].flags;
00668 size_mul = nut->frame_code[frame_code].size_mul;
00669 size = nut->frame_code[frame_code].size_lsb;
00670 *stream_id = nut->frame_code[frame_code].stream_id;
00671 pts_delta = nut->frame_code[frame_code].pts_delta;
00672 reserved_count = nut->frame_code[frame_code].reserved_count;
00673 *header_idx = nut->frame_code[frame_code].header_idx;
00674
00675 if(flags & FLAG_INVALID)
00676 return AVERROR_INVALIDDATA;
00677 if(flags & FLAG_CODED)
00678 flags ^= ffio_read_varlen(bc);
00679 if(flags & FLAG_STREAM_ID){
00680 GET_V(*stream_id, tmp < s->nb_streams)
00681 }
00682 stc= &nut->stream[*stream_id];
00683 if(flags&FLAG_CODED_PTS){
00684 int coded_pts= ffio_read_varlen(bc);
00685
00686 if(coded_pts < (1<<stc->msb_pts_shift)){
00687 *pts=ff_lsb2full(stc, coded_pts);
00688 }else
00689 *pts=coded_pts - (1<<stc->msb_pts_shift);
00690 }else
00691 *pts= stc->last_pts + pts_delta;
00692 if(flags&FLAG_SIZE_MSB){
00693 size += size_mul*ffio_read_varlen(bc);
00694 }
00695 if(flags&FLAG_MATCH_TIME)
00696 get_s(bc);
00697 if(flags&FLAG_HEADER_IDX)
00698 *header_idx= ffio_read_varlen(bc);
00699 if(flags&FLAG_RESERVED)
00700 reserved_count= ffio_read_varlen(bc);
00701 for(i=0; i<reserved_count; i++)
00702 ffio_read_varlen(bc);
00703
00704 if(*header_idx >= (unsigned)nut->header_count){
00705 av_log(s, AV_LOG_ERROR, "header_idx invalid\n");
00706 return AVERROR_INVALIDDATA;
00707 }
00708 if(size > 4096)
00709 *header_idx=0;
00710 size -= nut->header_len[*header_idx];
00711
00712 if(flags&FLAG_CHECKSUM){
00713 avio_rb32(bc);
00714 }else if(size > 2*nut->max_distance || FFABS(stc->last_pts - *pts) > stc->max_pts_distance){
00715 av_log(s, AV_LOG_ERROR, "frame size > 2max_distance and no checksum\n");
00716 return AVERROR_INVALIDDATA;
00717 }
00718
00719 stc->last_pts= *pts;
00720 stc->last_flags= flags;
00721
00722 return size;
00723 }
00724
00725 static int decode_frame(NUTContext *nut, AVPacket *pkt, int frame_code){
00726 AVFormatContext *s= nut->avf;
00727 AVIOContext *bc = s->pb;
00728 int size, stream_id, discard;
00729 int64_t pts, last_IP_pts;
00730 StreamContext *stc;
00731 uint8_t header_idx;
00732
00733 size= decode_frame_header(nut, &pts, &stream_id, &header_idx, frame_code);
00734 if(size < 0)
00735 return size;
00736
00737 stc= &nut->stream[stream_id];
00738
00739 if (stc->last_flags & FLAG_KEY)
00740 stc->skip_until_key_frame=0;
00741
00742 discard= s->streams[ stream_id ]->discard;
00743 last_IP_pts= s->streams[ stream_id ]->last_IP_pts;
00744 if( (discard >= AVDISCARD_NONKEY && !(stc->last_flags & FLAG_KEY))
00745 ||(discard >= AVDISCARD_BIDIR && last_IP_pts != AV_NOPTS_VALUE && last_IP_pts > pts)
00746 || discard >= AVDISCARD_ALL
00747 || stc->skip_until_key_frame){
00748 avio_skip(bc, size);
00749 return 1;
00750 }
00751
00752 av_new_packet(pkt, size + nut->header_len[header_idx]);
00753 memcpy(pkt->data, nut->header[header_idx], nut->header_len[header_idx]);
00754 pkt->pos= avio_tell(bc);
00755 avio_read(bc, pkt->data + nut->header_len[header_idx], size);
00756
00757 pkt->stream_index = stream_id;
00758 if (stc->last_flags & FLAG_KEY)
00759 pkt->flags |= AV_PKT_FLAG_KEY;
00760 pkt->pts = pts;
00761
00762 return 0;
00763 }
00764
00765 static int nut_read_packet(AVFormatContext *s, AVPacket *pkt)
00766 {
00767 NUTContext *nut = s->priv_data;
00768 AVIOContext *bc = s->pb;
00769 int i, frame_code=0, ret, skip;
00770 int64_t ts, back_ptr;
00771
00772 for(;;){
00773 int64_t pos= avio_tell(bc);
00774 uint64_t tmp= nut->next_startcode;
00775 nut->next_startcode=0;
00776
00777 if(tmp){
00778 pos-=8;
00779 }else{
00780 frame_code = avio_r8(bc);
00781 if(bc->eof_reached)
00782 return -1;
00783 if(frame_code == 'N'){
00784 tmp= frame_code;
00785 for(i=1; i<8; i++)
00786 tmp = (tmp<<8) + avio_r8(bc);
00787 }
00788 }
00789 switch(tmp){
00790 case MAIN_STARTCODE:
00791 case STREAM_STARTCODE:
00792 case INDEX_STARTCODE:
00793 skip= get_packetheader(nut, bc, 0, tmp);
00794 avio_skip(bc, skip);
00795 break;
00796 case INFO_STARTCODE:
00797 if(decode_info_header(nut)<0)
00798 goto resync;
00799 break;
00800 case SYNCPOINT_STARTCODE:
00801 if(decode_syncpoint(nut, &ts, &back_ptr)<0)
00802 goto resync;
00803 frame_code = avio_r8(bc);
00804 case 0:
00805 ret= decode_frame(nut, pkt, frame_code);
00806 if(ret==0)
00807 return 0;
00808 else if(ret==1)
00809 break;
00810 default:
00811 resync:
00812 av_log(s, AV_LOG_DEBUG, "syncing from %"PRId64"\n", pos);
00813 tmp= find_any_startcode(bc, nut->last_syncpoint_pos+1);
00814 if(tmp==0)
00815 return AVERROR_INVALIDDATA;
00816 av_log(s, AV_LOG_DEBUG, "sync\n");
00817 nut->next_startcode= tmp;
00818 }
00819 }
00820 }
00821
00822 static int64_t nut_read_timestamp(AVFormatContext *s, int stream_index, int64_t *pos_arg, int64_t pos_limit){
00823 NUTContext *nut = s->priv_data;
00824 AVIOContext *bc = s->pb;
00825 int64_t pos, pts, back_ptr;
00826 av_log(s, AV_LOG_DEBUG, "read_timestamp(X,%d,%"PRId64",%"PRId64")\n", stream_index, *pos_arg, pos_limit);
00827
00828 pos= *pos_arg;
00829 do{
00830 pos= find_startcode(bc, SYNCPOINT_STARTCODE, pos)+1;
00831 if(pos < 1){
00832 assert(nut->next_startcode == 0);
00833 av_log(s, AV_LOG_ERROR, "read_timestamp failed.\n");
00834 return AV_NOPTS_VALUE;
00835 }
00836 }while(decode_syncpoint(nut, &pts, &back_ptr) < 0);
00837 *pos_arg = pos-1;
00838 assert(nut->last_syncpoint_pos == *pos_arg);
00839
00840 av_log(s, AV_LOG_DEBUG, "return %"PRId64" %"PRId64"\n", pts,back_ptr );
00841 if (stream_index == -1) return pts;
00842 else if(stream_index == -2) return back_ptr;
00843
00844 assert(0);
00845 }
00846
00847 static int read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags){
00848 NUTContext *nut = s->priv_data;
00849 AVStream *st= s->streams[stream_index];
00850 Syncpoint dummy={.ts= pts*av_q2d(st->time_base)*AV_TIME_BASE};
00851 Syncpoint nopts_sp= {.ts= AV_NOPTS_VALUE, .back_ptr= AV_NOPTS_VALUE};
00852 Syncpoint *sp, *next_node[2]= {&nopts_sp, &nopts_sp};
00853 int64_t pos, pos2, ts;
00854 int i;
00855
00856 if(st->index_entries){
00857 int index= av_index_search_timestamp(st, pts, flags);
00858 if(index<0)
00859 return -1;
00860
00861 pos2= st->index_entries[index].pos;
00862 ts = st->index_entries[index].timestamp;
00863 }else{
00864 av_tree_find(nut->syncpoints, &dummy, (void *) ff_nut_sp_pts_cmp,
00865 (void **) next_node);
00866 av_log(s, AV_LOG_DEBUG, "%"PRIu64"-%"PRIu64" %"PRId64"-%"PRId64"\n", next_node[0]->pos, next_node[1]->pos,
00867 next_node[0]->ts , next_node[1]->ts);
00868 pos = ff_gen_search(s, -1, dummy.ts, next_node[0]->pos, next_node[1]->pos, next_node[1]->pos,
00869 next_node[0]->ts , next_node[1]->ts, AVSEEK_FLAG_BACKWARD, &ts, nut_read_timestamp);
00870
00871 if(!(flags & AVSEEK_FLAG_BACKWARD)){
00872 dummy.pos= pos+16;
00873 next_node[1]= &nopts_sp;
00874 av_tree_find(nut->syncpoints, &dummy, (void *) ff_nut_sp_pos_cmp,
00875 (void **) next_node);
00876 pos2 = ff_gen_search(s, -2, dummy.pos, next_node[0]->pos , next_node[1]->pos, next_node[1]->pos,
00877 next_node[0]->back_ptr, next_node[1]->back_ptr, flags, &ts, nut_read_timestamp);
00878 if(pos2>=0)
00879 pos= pos2;
00880
00881 }
00882 dummy.pos= pos;
00883 sp= av_tree_find(nut->syncpoints, &dummy, (void *) ff_nut_sp_pos_cmp,
00884 NULL);
00885
00886 assert(sp);
00887 pos2= sp->back_ptr - 15;
00888 }
00889 av_log(NULL, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos2);
00890 pos= find_startcode(s->pb, SYNCPOINT_STARTCODE, pos2);
00891 avio_seek(s->pb, pos, SEEK_SET);
00892 av_log(NULL, AV_LOG_DEBUG, "SP: %"PRId64"\n", pos);
00893 if(pos2 > pos || pos2 + 15 < pos){
00894 av_log(NULL, AV_LOG_ERROR, "no syncpoint at backptr pos\n");
00895 }
00896 for(i=0; i<s->nb_streams; i++)
00897 nut->stream[i].skip_until_key_frame=1;
00898
00899 return 0;
00900 }
00901
00902 static int nut_read_close(AVFormatContext *s)
00903 {
00904 NUTContext *nut = s->priv_data;
00905 int i;
00906
00907 av_freep(&nut->time_base);
00908 av_freep(&nut->stream);
00909 ff_nut_free_sp(nut);
00910 for(i = 1; i < nut->header_count; i++)
00911 av_freep(&nut->header[i]);
00912
00913 return 0;
00914 }
00915
00916 #if CONFIG_NUT_DEMUXER
00917 AVInputFormat ff_nut_demuxer = {
00918 .name = "nut",
00919 .long_name = NULL_IF_CONFIG_SMALL("NUT format"),
00920 .priv_data_size = sizeof(NUTContext),
00921 .read_probe = nut_probe,
00922 .read_header = nut_read_header,
00923 .read_packet = nut_read_packet,
00924 .read_close = nut_read_close,
00925 .read_seek = read_seek,
00926 .extensions = "nut",
00927 .codec_tag = (const AVCodecTag * const []) { ff_codec_bmp_tags, ff_nut_video_tags, ff_codec_wav_tags, ff_nut_subtitle_tags, 0 },
00928 };
00929 #endif