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00023 #include <strings.h>
00024 #include "libavutil/avstring.h"
00025 #include "libavutil/bswap.h"
00026 #include "libavutil/tree.h"
00027 #include "nut.h"
00028
00029 #undef NDEBUG
00030 #include <assert.h>
00031
00032 static int get_str(ByteIOContext *bc, char *string, unsigned int maxlen){
00033 unsigned int len= ff_get_v(bc);
00034
00035 if(len && maxlen)
00036 get_buffer(bc, string, FFMIN(len, maxlen));
00037 while(len > maxlen){
00038 get_byte(bc);
00039 len--;
00040 }
00041
00042 if(maxlen)
00043 string[FFMIN(len, maxlen-1)]= 0;
00044
00045 if(maxlen == len)
00046 return -1;
00047 else
00048 return 0;
00049 }
00050
00051 static int64_t get_s(ByteIOContext *bc){
00052 int64_t v = ff_get_v(bc) + 1;
00053
00054 if (v&1) return -(v>>1);
00055 else return (v>>1);
00056 }
00057
00058 static uint64_t get_fourcc(ByteIOContext *bc){
00059 unsigned int len= ff_get_v(bc);
00060
00061 if (len==2) return get_le16(bc);
00062 else if(len==4) return get_le32(bc);
00063 else return -1;
00064 }
00065
00066 #ifdef TRACE
00067 static inline uint64_t get_v_trace(ByteIOContext *bc, char *file, char *func, int line){
00068 uint64_t v= ff_get_v(bc);
00069
00070 av_log(NULL, AV_LOG_DEBUG, "get_v %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line);
00071 return v;
00072 }
00073
00074 static inline int64_t get_s_trace(ByteIOContext *bc, char *file, char *func, int line){
00075 int64_t v= get_s(bc);
00076
00077 av_log(NULL, AV_LOG_DEBUG, "get_s %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line);
00078 return v;
00079 }
00080
00081 static inline uint64_t get_vb_trace(ByteIOContext *bc, char *file, char *func, int line){
00082 uint64_t v= get_vb(bc);
00083
00084 av_log(NULL, AV_LOG_DEBUG, "get_vb %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line);
00085 return v;
00086 }
00087 #define ff_get_v(bc) get_v_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__)
00088 #define get_s(bc) get_s_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__)
00089 #define get_vb(bc) get_vb_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__)
00090 #endif
00091
00092 static int get_packetheader(NUTContext *nut, ByteIOContext *bc, int calculate_checksum, uint64_t startcode)
00093 {
00094 int64_t size;
00095
00096
00097 startcode= be2me_64(startcode);
00098 startcode= ff_crc04C11DB7_update(0, &startcode, 8);
00099
00100 init_checksum(bc, ff_crc04C11DB7_update, startcode);
00101 size= ff_get_v(bc);
00102 if(size > 4096)
00103 get_be32(bc);
00104 if(get_checksum(bc) && size > 4096)
00105 return -1;
00106
00107 init_checksum(bc, calculate_checksum ? ff_crc04C11DB7_update : NULL, 0);
00108
00109 return size;
00110 }
00111
00112 static uint64_t find_any_startcode(ByteIOContext *bc, int64_t pos){
00113 uint64_t state=0;
00114
00115 if(pos >= 0)
00116 url_fseek(bc, pos, SEEK_SET);
00117
00118 while(!url_feof(bc)){
00119 state= (state<<8) | get_byte(bc);
00120 if((state>>56) != 'N')
00121 continue;
00122 switch(state){
00123 case MAIN_STARTCODE:
00124 case STREAM_STARTCODE:
00125 case SYNCPOINT_STARTCODE:
00126 case INFO_STARTCODE:
00127 case INDEX_STARTCODE:
00128 return state;
00129 }
00130 }
00131
00132 return 0;
00133 }
00134
00141 static int64_t find_startcode(ByteIOContext *bc, uint64_t code, int64_t pos){
00142 for(;;){
00143 uint64_t startcode= find_any_startcode(bc, pos);
00144 if(startcode == code)
00145 return url_ftell(bc) - 8;
00146 else if(startcode == 0)
00147 return -1;
00148 pos=-1;
00149 }
00150 }
00151
00152 static int nut_probe(AVProbeData *p){
00153 int i;
00154 uint64_t code= 0;
00155
00156 for (i = 0; i < p->buf_size; i++) {
00157 code = (code << 8) | p->buf[i];
00158 if (code == MAIN_STARTCODE)
00159 return AVPROBE_SCORE_MAX;
00160 }
00161 return 0;
00162 }
00163
00164 #define GET_V(dst, check) \
00165 tmp= ff_get_v(bc);\
00166 if(!(check)){\
00167 av_log(s, AV_LOG_ERROR, "Error " #dst " is (%"PRId64")\n", tmp);\
00168 return -1;\
00169 }\
00170 dst= tmp;
00171
00172 static int skip_reserved(ByteIOContext *bc, int64_t pos){
00173 pos -= url_ftell(bc);
00174 if(pos<0){
00175 url_fseek(bc, pos, SEEK_CUR);
00176 return -1;
00177 }else{
00178 while(pos--)
00179 get_byte(bc);
00180 return 0;
00181 }
00182 }
00183
00184 static int decode_main_header(NUTContext *nut){
00185 AVFormatContext *s= nut->avf;
00186 ByteIOContext *bc = s->pb;
00187 uint64_t tmp, end;
00188 unsigned int stream_count;
00189 int i, j, tmp_stream, tmp_mul, tmp_pts, tmp_size, count, tmp_res, tmp_head_idx;
00190 int64_t tmp_match;
00191
00192 end= get_packetheader(nut, bc, 1, MAIN_STARTCODE);
00193 end += url_ftell(bc);
00194
00195 GET_V(tmp , tmp >=2 && tmp <= 3)
00196 GET_V(stream_count , tmp > 0 && tmp <=MAX_STREAMS)
00197
00198 nut->max_distance = ff_get_v(bc);
00199 if(nut->max_distance > 65536){
00200 av_log(s, AV_LOG_DEBUG, "max_distance %d\n", nut->max_distance);
00201 nut->max_distance= 65536;
00202 }
00203
00204 GET_V(nut->time_base_count, tmp>0 && tmp<INT_MAX / sizeof(AVRational))
00205 nut->time_base= av_malloc(nut->time_base_count * sizeof(AVRational));
00206
00207 for(i=0; i<nut->time_base_count; i++){
00208 GET_V(nut->time_base[i].num, tmp>0 && tmp<(1ULL<<31))
00209 GET_V(nut->time_base[i].den, tmp>0 && tmp<(1ULL<<31))
00210 if(av_gcd(nut->time_base[i].num, nut->time_base[i].den) != 1){
00211 av_log(s, AV_LOG_ERROR, "time base invalid\n");
00212 return -1;
00213 }
00214 }
00215 tmp_pts=0;
00216 tmp_mul=1;
00217 tmp_stream=0;
00218 tmp_match= 1-(1LL<<62);
00219 tmp_head_idx= 0;
00220 for(i=0; i<256;){
00221 int tmp_flags = ff_get_v(bc);
00222 int tmp_fields= ff_get_v(bc);
00223 if(tmp_fields>0) tmp_pts = get_s(bc);
00224 if(tmp_fields>1) tmp_mul = ff_get_v(bc);
00225 if(tmp_fields>2) tmp_stream= ff_get_v(bc);
00226 if(tmp_fields>3) tmp_size = ff_get_v(bc);
00227 else tmp_size = 0;
00228 if(tmp_fields>4) tmp_res = ff_get_v(bc);
00229 else tmp_res = 0;
00230 if(tmp_fields>5) count = ff_get_v(bc);
00231 else count = tmp_mul - tmp_size;
00232 if(tmp_fields>6) tmp_match = get_s(bc);
00233 if(tmp_fields>7) tmp_head_idx= ff_get_v(bc);
00234
00235 while(tmp_fields-- > 8)
00236 ff_get_v(bc);
00237
00238 if(count == 0 || i+count > 256){
00239 av_log(s, AV_LOG_ERROR, "illegal count %d at %d\n", count, i);
00240 return -1;
00241 }
00242 if(tmp_stream >= stream_count){
00243 av_log(s, AV_LOG_ERROR, "illegal stream number\n");
00244 return -1;
00245 }
00246
00247 for(j=0; j<count; j++,i++){
00248 if (i == 'N') {
00249 nut->frame_code[i].flags= FLAG_INVALID;
00250 j--;
00251 continue;
00252 }
00253 nut->frame_code[i].flags = tmp_flags ;
00254 nut->frame_code[i].pts_delta = tmp_pts ;
00255 nut->frame_code[i].stream_id = tmp_stream;
00256 nut->frame_code[i].size_mul = tmp_mul ;
00257 nut->frame_code[i].size_lsb = tmp_size+j;
00258 nut->frame_code[i].reserved_count = tmp_res ;
00259 nut->frame_code[i].header_idx = tmp_head_idx;
00260 }
00261 }
00262 assert(nut->frame_code['N'].flags == FLAG_INVALID);
00263
00264 if(end > url_ftell(bc) + 4){
00265 int rem= 1024;
00266 GET_V(nut->header_count, tmp<128U)
00267 nut->header_count++;
00268 for(i=1; i<nut->header_count; i++){
00269 GET_V(nut->header_len[i], tmp>0 && tmp<256);
00270 rem -= nut->header_len[i];
00271 if(rem < 0){
00272 av_log(s, AV_LOG_ERROR, "invalid elision header\n");
00273 return -1;
00274 }
00275 nut->header[i]= av_malloc(nut->header_len[i]);
00276 get_buffer(bc, nut->header[i], nut->header_len[i]);
00277 }
00278 assert(nut->header_len[0]==0);
00279 }
00280
00281 if(skip_reserved(bc, end) || get_checksum(bc)){
00282 av_log(s, AV_LOG_ERROR, "main header checksum mismatch\n");
00283 return -1;
00284 }
00285
00286 nut->stream = av_mallocz(sizeof(StreamContext)*stream_count);
00287 for(i=0; i<stream_count; i++){
00288 av_new_stream(s, i);
00289 }
00290
00291 return 0;
00292 }
00293
00294 static int decode_stream_header(NUTContext *nut){
00295 AVFormatContext *s= nut->avf;
00296 ByteIOContext *bc = s->pb;
00297 StreamContext *stc;
00298 int class, stream_id;
00299 uint64_t tmp, end;
00300 AVStream *st;
00301
00302 end= get_packetheader(nut, bc, 1, STREAM_STARTCODE);
00303 end += url_ftell(bc);
00304
00305 GET_V(stream_id, tmp < s->nb_streams && !nut->stream[tmp].time_base);
00306 stc= &nut->stream[stream_id];
00307
00308 st = s->streams[stream_id];
00309 if (!st)
00310 return AVERROR(ENOMEM);
00311
00312 class = ff_get_v(bc);
00313 tmp = get_fourcc(bc);
00314 st->codec->codec_tag= tmp;
00315 switch(class)
00316 {
00317 case 0:
00318 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
00319 st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tmp);
00320 break;
00321 case 1:
00322 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
00323 st->codec->codec_id = ff_codec_get_id(ff_codec_wav_tags, tmp);
00324 break;
00325 case 2:
00326 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
00327 st->codec->codec_id = ff_codec_get_id(ff_nut_subtitle_tags, tmp);
00328 break;
00329 case 3:
00330 st->codec->codec_type = AVMEDIA_TYPE_DATA;
00331 break;
00332 default:
00333 av_log(s, AV_LOG_ERROR, "unknown stream class (%d)\n", class);
00334 return -1;
00335 }
00336 if(class<3 && st->codec->codec_id == CODEC_ID_NONE)
00337 av_log(s, AV_LOG_ERROR, "Unknown codec tag '0x%04x' for stream number %d\n",
00338 (unsigned int)tmp, stream_id);
00339
00340 GET_V(stc->time_base_id , tmp < nut->time_base_count);
00341 GET_V(stc->msb_pts_shift , tmp < 16);
00342 stc->max_pts_distance= ff_get_v(bc);
00343 GET_V(stc->decode_delay , tmp < 1000);
00344 st->codec->has_b_frames= stc->decode_delay;
00345 ff_get_v(bc);
00346
00347 GET_V(st->codec->extradata_size, tmp < (1<<30));
00348 if(st->codec->extradata_size){
00349 st->codec->extradata= av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
00350 get_buffer(bc, st->codec->extradata, st->codec->extradata_size);
00351 }
00352
00353 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO){
00354 GET_V(st->codec->width , tmp > 0)
00355 GET_V(st->codec->height, tmp > 0)
00356 st->sample_aspect_ratio.num= ff_get_v(bc);
00357 st->sample_aspect_ratio.den= ff_get_v(bc);
00358 if((!st->sample_aspect_ratio.num) != (!st->sample_aspect_ratio.den)){
00359 av_log(s, AV_LOG_ERROR, "invalid aspect ratio %d/%d\n", st->sample_aspect_ratio.num, st->sample_aspect_ratio.den);
00360 return -1;
00361 }
00362 ff_get_v(bc);
00363 }else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO){
00364 GET_V(st->codec->sample_rate , tmp > 0)
00365 ff_get_v(bc);
00366 GET_V(st->codec->channels, tmp > 0)
00367 }
00368 if(skip_reserved(bc, end) || get_checksum(bc)){
00369 av_log(s, AV_LOG_ERROR, "stream header %d checksum mismatch\n", stream_id);
00370 return -1;
00371 }
00372 stc->time_base= &nut->time_base[stc->time_base_id];
00373 av_set_pts_info(s->streams[stream_id], 63, stc->time_base->num, stc->time_base->den);
00374 return 0;
00375 }
00376
00377 static void set_disposition_bits(AVFormatContext* avf, char* value, int stream_id){
00378 int flag = 0, i;
00379 for (i=0; ff_nut_dispositions[i].flag; ++i) {
00380 if (!strcmp(ff_nut_dispositions[i].str, value))
00381 flag = ff_nut_dispositions[i].flag;
00382 }
00383 if (!flag)
00384 av_log(avf, AV_LOG_INFO, "unknown disposition type '%s'\n", value);
00385 for (i = 0; i < avf->nb_streams; ++i)
00386 if (stream_id == i || stream_id == -1)
00387 avf->streams[i]->disposition |= flag;
00388 }
00389
00390 static int decode_info_header(NUTContext *nut){
00391 AVFormatContext *s= nut->avf;
00392 ByteIOContext *bc = s->pb;
00393 uint64_t tmp, chapter_start, chapter_len;
00394 unsigned int stream_id_plus1, count;
00395 int chapter_id, i;
00396 int64_t value, end;
00397 char name[256], str_value[1024], type_str[256];
00398 const char *type;
00399 AVChapter *chapter= NULL;
00400 AVStream *st= NULL;
00401
00402 end= get_packetheader(nut, bc, 1, INFO_STARTCODE);
00403 end += url_ftell(bc);
00404
00405 GET_V(stream_id_plus1, tmp <= s->nb_streams)
00406 chapter_id = get_s(bc);
00407 chapter_start= ff_get_v(bc);
00408 chapter_len = ff_get_v(bc);
00409 count = ff_get_v(bc);
00410
00411 if(chapter_id && !stream_id_plus1){
00412 int64_t start= chapter_start / nut->time_base_count;
00413 chapter= ff_new_chapter(s, chapter_id,
00414 nut->time_base[chapter_start % nut->time_base_count],
00415 start, start + chapter_len, NULL);
00416 } else if(stream_id_plus1)
00417 st= s->streams[stream_id_plus1 - 1];
00418
00419 for(i=0; i<count; i++){
00420 get_str(bc, name, sizeof(name));
00421 value= get_s(bc);
00422 if(value == -1){
00423 type= "UTF-8";
00424 get_str(bc, str_value, sizeof(str_value));
00425 }else if(value == -2){
00426 get_str(bc, type_str, sizeof(type_str));
00427 type= type_str;
00428 get_str(bc, str_value, sizeof(str_value));
00429 }else if(value == -3){
00430 type= "s";
00431 value= get_s(bc);
00432 }else if(value == -4){
00433 type= "t";
00434 value= ff_get_v(bc);
00435 }else if(value < -4){
00436 type= "r";
00437 get_s(bc);
00438 }else{
00439 type= "v";
00440 }
00441
00442 if (stream_id_plus1 > s->nb_streams) {
00443 av_log(s, AV_LOG_ERROR, "invalid stream id for info packet\n");
00444 continue;
00445 }
00446
00447 if(!strcmp(type, "UTF-8")){
00448 AVMetadata **metadata = NULL;
00449 if(chapter_id==0 && !strcmp(name, "Disposition"))
00450 set_disposition_bits(s, str_value, stream_id_plus1 - 1);
00451 else if(chapter) metadata= &chapter->metadata;
00452 else if(stream_id_plus1) metadata= &st->metadata;
00453 else metadata= &s->metadata;
00454 if(metadata && strcasecmp(name,"Uses")
00455 && strcasecmp(name,"Depends") && strcasecmp(name,"Replaces"))
00456 av_metadata_set2(metadata, name, str_value, 0);
00457 }
00458 }
00459
00460 if(skip_reserved(bc, end) || get_checksum(bc)){
00461 av_log(s, AV_LOG_ERROR, "info header checksum mismatch\n");
00462 return -1;
00463 }
00464 return 0;
00465 }
00466
00467 static int decode_syncpoint(NUTContext *nut, int64_t *ts, int64_t *back_ptr){
00468 AVFormatContext *s= nut->avf;
00469 ByteIOContext *bc = s->pb;
00470 int64_t end, tmp;
00471
00472 nut->last_syncpoint_pos= url_ftell(bc)-8;
00473
00474 end= get_packetheader(nut, bc, 1, SYNCPOINT_STARTCODE);
00475 end += url_ftell(bc);
00476
00477 tmp= ff_get_v(bc);
00478 *back_ptr= nut->last_syncpoint_pos - 16*ff_get_v(bc);
00479 if(*back_ptr < 0)
00480 return -1;
00481
00482 ff_nut_reset_ts(nut, nut->time_base[tmp % nut->time_base_count], tmp / nut->time_base_count);
00483
00484 if(skip_reserved(bc, end) || get_checksum(bc)){
00485 av_log(s, AV_LOG_ERROR, "sync point checksum mismatch\n");
00486 return -1;
00487 }
00488
00489 *ts= tmp / s->nb_streams * av_q2d(nut->time_base[tmp % s->nb_streams])*AV_TIME_BASE;
00490 ff_nut_add_sp(nut, nut->last_syncpoint_pos, *back_ptr, *ts);
00491
00492 return 0;
00493 }
00494
00495 static int find_and_decode_index(NUTContext *nut){
00496 AVFormatContext *s= nut->avf;
00497 ByteIOContext *bc = s->pb;
00498 uint64_t tmp, end;
00499 int i, j, syncpoint_count;
00500 int64_t filesize= url_fsize(bc);
00501 int64_t *syncpoints;
00502 int8_t *has_keyframe;
00503 int ret= -1;
00504
00505 url_fseek(bc, filesize-12, SEEK_SET);
00506 url_fseek(bc, filesize-get_be64(bc), SEEK_SET);
00507 if(get_be64(bc) != INDEX_STARTCODE){
00508 av_log(s, AV_LOG_ERROR, "no index at the end\n");
00509 return -1;
00510 }
00511
00512 end= get_packetheader(nut, bc, 1, INDEX_STARTCODE);
00513 end += url_ftell(bc);
00514
00515 ff_get_v(bc);
00516 GET_V(syncpoint_count, tmp < INT_MAX/8 && tmp > 0)
00517 syncpoints= av_malloc(sizeof(int64_t)*syncpoint_count);
00518 has_keyframe= av_malloc(sizeof(int8_t)*(syncpoint_count+1));
00519 for(i=0; i<syncpoint_count; i++){
00520 syncpoints[i] = ff_get_v(bc);
00521 if(syncpoints[i] <= 0)
00522 goto fail;
00523 if(i)
00524 syncpoints[i] += syncpoints[i-1];
00525 }
00526
00527 for(i=0; i<s->nb_streams; i++){
00528 int64_t last_pts= -1;
00529 for(j=0; j<syncpoint_count;){
00530 uint64_t x= ff_get_v(bc);
00531 int type= x&1;
00532 int n= j;
00533 x>>=1;
00534 if(type){
00535 int flag= x&1;
00536 x>>=1;
00537 if(n+x >= syncpoint_count + 1){
00538 av_log(s, AV_LOG_ERROR, "index overflow A\n");
00539 goto fail;
00540 }
00541 while(x--)
00542 has_keyframe[n++]= flag;
00543 has_keyframe[n++]= !flag;
00544 }else{
00545 while(x != 1){
00546 if(n>=syncpoint_count + 1){
00547 av_log(s, AV_LOG_ERROR, "index overflow B\n");
00548 goto fail;
00549 }
00550 has_keyframe[n++]= x&1;
00551 x>>=1;
00552 }
00553 }
00554 if(has_keyframe[0]){
00555 av_log(s, AV_LOG_ERROR, "keyframe before first syncpoint in index\n");
00556 goto fail;
00557 }
00558 assert(n<=syncpoint_count+1);
00559 for(; j<n && j<syncpoint_count; j++){
00560 if(has_keyframe[j]){
00561 uint64_t B, A= ff_get_v(bc);
00562 if(!A){
00563 A= ff_get_v(bc);
00564 B= ff_get_v(bc);
00565
00566 }else
00567 B= 0;
00568 av_add_index_entry(
00569 s->streams[i],
00570 16*syncpoints[j-1],
00571 last_pts + A,
00572 0,
00573 0,
00574 AVINDEX_KEYFRAME);
00575 last_pts += A + B;
00576 }
00577 }
00578 }
00579 }
00580
00581 if(skip_reserved(bc, end) || get_checksum(bc)){
00582 av_log(s, AV_LOG_ERROR, "index checksum mismatch\n");
00583 goto fail;
00584 }
00585 ret= 0;
00586 fail:
00587 av_free(syncpoints);
00588 av_free(has_keyframe);
00589 return ret;
00590 }
00591
00592 static int nut_read_header(AVFormatContext *s, AVFormatParameters *ap)
00593 {
00594 NUTContext *nut = s->priv_data;
00595 ByteIOContext *bc = s->pb;
00596 int64_t pos;
00597 int initialized_stream_count;
00598
00599 nut->avf= s;
00600
00601
00602 pos=0;
00603 do{
00604 pos= find_startcode(bc, MAIN_STARTCODE, pos)+1;
00605 if (pos<0+1){
00606 av_log(s, AV_LOG_ERROR, "No main startcode found.\n");
00607 return -1;
00608 }
00609 }while(decode_main_header(nut) < 0);
00610
00611
00612 pos=0;
00613 for(initialized_stream_count=0; initialized_stream_count < s->nb_streams;){
00614 pos= find_startcode(bc, STREAM_STARTCODE, pos)+1;
00615 if (pos<0+1){
00616 av_log(s, AV_LOG_ERROR, "Not all stream headers found.\n");
00617 return -1;
00618 }
00619 if(decode_stream_header(nut) >= 0)
00620 initialized_stream_count++;
00621 }
00622
00623
00624 pos=0;
00625 for(;;){
00626 uint64_t startcode= find_any_startcode(bc, pos);
00627 pos= url_ftell(bc);
00628
00629 if(startcode==0){
00630 av_log(s, AV_LOG_ERROR, "EOF before video frames\n");
00631 return -1;
00632 }else if(startcode == SYNCPOINT_STARTCODE){
00633 nut->next_startcode= startcode;
00634 break;
00635 }else if(startcode != INFO_STARTCODE){
00636 continue;
00637 }
00638
00639 decode_info_header(nut);
00640 }
00641
00642 s->data_offset= pos-8;
00643
00644 if(!url_is_streamed(bc)){
00645 int64_t orig_pos= url_ftell(bc);
00646 find_and_decode_index(nut);
00647 url_fseek(bc, orig_pos, SEEK_SET);
00648 }
00649 assert(nut->next_startcode == SYNCPOINT_STARTCODE);
00650
00651 return 0;
00652 }
00653
00654 static int decode_frame_header(NUTContext *nut, int64_t *pts, int *stream_id, uint8_t *header_idx, int frame_code){
00655 AVFormatContext *s= nut->avf;
00656 ByteIOContext *bc = s->pb;
00657 StreamContext *stc;
00658 int size, flags, size_mul, pts_delta, i, reserved_count;
00659 uint64_t tmp;
00660
00661 if(url_ftell(bc) > nut->last_syncpoint_pos + nut->max_distance){
00662 av_log(s, AV_LOG_ERROR, "Last frame must have been damaged %"PRId64" > %"PRId64" + %d\n", url_ftell(bc), nut->last_syncpoint_pos, nut->max_distance);
00663 return -1;
00664 }
00665
00666 flags = nut->frame_code[frame_code].flags;
00667 size_mul = nut->frame_code[frame_code].size_mul;
00668 size = nut->frame_code[frame_code].size_lsb;
00669 *stream_id = nut->frame_code[frame_code].stream_id;
00670 pts_delta = nut->frame_code[frame_code].pts_delta;
00671 reserved_count = nut->frame_code[frame_code].reserved_count;
00672 *header_idx = nut->frame_code[frame_code].header_idx;
00673
00674 if(flags & FLAG_INVALID)
00675 return -1;
00676 if(flags & FLAG_CODED)
00677 flags ^= ff_get_v(bc);
00678 if(flags & FLAG_STREAM_ID){
00679 GET_V(*stream_id, tmp < s->nb_streams)
00680 }
00681 stc= &nut->stream[*stream_id];
00682 if(flags&FLAG_CODED_PTS){
00683 int coded_pts= ff_get_v(bc);
00684
00685 if(coded_pts < (1<<stc->msb_pts_shift)){
00686 *pts=ff_lsb2full(stc, coded_pts);
00687 }else
00688 *pts=coded_pts - (1<<stc->msb_pts_shift);
00689 }else
00690 *pts= stc->last_pts + pts_delta;
00691 if(flags&FLAG_SIZE_MSB){
00692 size += size_mul*ff_get_v(bc);
00693 }
00694 if(flags&FLAG_MATCH_TIME)
00695 get_s(bc);
00696 if(flags&FLAG_HEADER_IDX)
00697 *header_idx= ff_get_v(bc);
00698 if(flags&FLAG_RESERVED)
00699 reserved_count= ff_get_v(bc);
00700 for(i=0; i<reserved_count; i++)
00701 ff_get_v(bc);
00702
00703 if(*header_idx >= (unsigned)nut->header_count){
00704 av_log(s, AV_LOG_ERROR, "header_idx invalid\n");
00705 return -1;
00706 }
00707 if(size > 4096)
00708 *header_idx=0;
00709 size -= nut->header_len[*header_idx];
00710
00711 if(flags&FLAG_CHECKSUM){
00712 get_be32(bc);
00713 }else if(size > 2*nut->max_distance || FFABS(stc->last_pts - *pts) > stc->max_pts_distance){
00714 av_log(s, AV_LOG_ERROR, "frame size > 2max_distance and no checksum\n");
00715 return -1;
00716 }
00717
00718 stc->last_pts= *pts;
00719 stc->last_flags= flags;
00720
00721 return size;
00722 }
00723
00724 static int decode_frame(NUTContext *nut, AVPacket *pkt, int frame_code){
00725 AVFormatContext *s= nut->avf;
00726 ByteIOContext *bc = s->pb;
00727 int size, stream_id, discard;
00728 int64_t pts, last_IP_pts;
00729 StreamContext *stc;
00730 uint8_t header_idx;
00731
00732 size= decode_frame_header(nut, &pts, &stream_id, &header_idx, frame_code);
00733 if(size < 0)
00734 return -1;
00735
00736 stc= &nut->stream[stream_id];
00737
00738 if (stc->last_flags & FLAG_KEY)
00739 stc->skip_until_key_frame=0;
00740
00741 discard= s->streams[ stream_id ]->discard;
00742 last_IP_pts= s->streams[ stream_id ]->last_IP_pts;
00743 if( (discard >= AVDISCARD_NONKEY && !(stc->last_flags & FLAG_KEY))
00744 ||(discard >= AVDISCARD_BIDIR && last_IP_pts != AV_NOPTS_VALUE && last_IP_pts > pts)
00745 || discard >= AVDISCARD_ALL
00746 || stc->skip_until_key_frame){
00747 url_fskip(bc, size);
00748 return 1;
00749 }
00750
00751 av_new_packet(pkt, size + nut->header_len[header_idx]);
00752 memcpy(pkt->data, nut->header[header_idx], nut->header_len[header_idx]);
00753 pkt->pos= url_ftell(bc);
00754 get_buffer(bc, pkt->data + nut->header_len[header_idx], size);
00755
00756 pkt->stream_index = stream_id;
00757 if (stc->last_flags & FLAG_KEY)
00758 pkt->flags |= AV_PKT_FLAG_KEY;
00759 pkt->pts = pts;
00760
00761 return 0;
00762 }
00763
00764 static int nut_read_packet(AVFormatContext *s, AVPacket *pkt)
00765 {
00766 NUTContext *nut = s->priv_data;
00767 ByteIOContext *bc = s->pb;
00768 int i, frame_code=0, ret, skip;
00769 int64_t ts, back_ptr;
00770
00771 for(;;){
00772 int64_t pos= url_ftell(bc);
00773 uint64_t tmp= nut->next_startcode;
00774 nut->next_startcode=0;
00775
00776 if(tmp){
00777 pos-=8;
00778 }else{
00779 frame_code = get_byte(bc);
00780 if(url_feof(bc))
00781 return -1;
00782 if(frame_code == 'N'){
00783 tmp= frame_code;
00784 for(i=1; i<8; i++)
00785 tmp = (tmp<<8) + get_byte(bc);
00786 }
00787 }
00788 switch(tmp){
00789 case MAIN_STARTCODE:
00790 case STREAM_STARTCODE:
00791 case INDEX_STARTCODE:
00792 skip= get_packetheader(nut, bc, 0, tmp);
00793 url_fseek(bc, skip, SEEK_CUR);
00794 break;
00795 case INFO_STARTCODE:
00796 if(decode_info_header(nut)<0)
00797 goto resync;
00798 break;
00799 case SYNCPOINT_STARTCODE:
00800 if(decode_syncpoint(nut, &ts, &back_ptr)<0)
00801 goto resync;
00802 frame_code = get_byte(bc);
00803 case 0:
00804 ret= decode_frame(nut, pkt, frame_code);
00805 if(ret==0)
00806 return 0;
00807 else if(ret==1)
00808 break;
00809 default:
00810 resync:
00811 av_log(s, AV_LOG_DEBUG, "syncing from %"PRId64"\n", pos);
00812 tmp= find_any_startcode(bc, nut->last_syncpoint_pos+1);
00813 if(tmp==0)
00814 return -1;
00815 av_log(s, AV_LOG_DEBUG, "sync\n");
00816 nut->next_startcode= tmp;
00817 }
00818 }
00819 }
00820
00821 static int64_t nut_read_timestamp(AVFormatContext *s, int stream_index, int64_t *pos_arg, int64_t pos_limit){
00822 NUTContext *nut = s->priv_data;
00823 ByteIOContext *bc = s->pb;
00824 int64_t pos, pts, back_ptr;
00825 av_log(s, AV_LOG_DEBUG, "read_timestamp(X,%d,%"PRId64",%"PRId64")\n", stream_index, *pos_arg, pos_limit);
00826
00827 pos= *pos_arg;
00828 do{
00829 pos= find_startcode(bc, SYNCPOINT_STARTCODE, pos)+1;
00830 if(pos < 1){
00831 assert(nut->next_startcode == 0);
00832 av_log(s, AV_LOG_ERROR, "read_timestamp failed.\n");
00833 return AV_NOPTS_VALUE;
00834 }
00835 }while(decode_syncpoint(nut, &pts, &back_ptr) < 0);
00836 *pos_arg = pos-1;
00837 assert(nut->last_syncpoint_pos == *pos_arg);
00838
00839 av_log(s, AV_LOG_DEBUG, "return %"PRId64" %"PRId64"\n", pts,back_ptr );
00840 if (stream_index == -1) return pts;
00841 else if(stream_index == -2) return back_ptr;
00842
00843 assert(0);
00844 }
00845
00846 static int read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags){
00847 NUTContext *nut = s->priv_data;
00848 AVStream *st= s->streams[stream_index];
00849 Syncpoint dummy={.ts= pts*av_q2d(st->time_base)*AV_TIME_BASE};
00850 Syncpoint nopts_sp= {.ts= AV_NOPTS_VALUE, .back_ptr= AV_NOPTS_VALUE};
00851 Syncpoint *sp, *next_node[2]= {&nopts_sp, &nopts_sp};
00852 int64_t pos, pos2, ts;
00853 int i;
00854
00855 if(st->index_entries){
00856 int index= av_index_search_timestamp(st, pts, flags);
00857 if(index<0)
00858 return -1;
00859
00860 pos2= st->index_entries[index].pos;
00861 ts = st->index_entries[index].timestamp;
00862 }else{
00863 av_tree_find(nut->syncpoints, &dummy, (void *) ff_nut_sp_pts_cmp,
00864 (void **) next_node);
00865 av_log(s, AV_LOG_DEBUG, "%"PRIu64"-%"PRIu64" %"PRId64"-%"PRId64"\n", next_node[0]->pos, next_node[1]->pos,
00866 next_node[0]->ts , next_node[1]->ts);
00867 pos= av_gen_search(s, -1, dummy.ts, next_node[0]->pos, next_node[1]->pos, next_node[1]->pos,
00868 next_node[0]->ts , next_node[1]->ts, AVSEEK_FLAG_BACKWARD, &ts, nut_read_timestamp);
00869
00870 if(!(flags & AVSEEK_FLAG_BACKWARD)){
00871 dummy.pos= pos+16;
00872 next_node[1]= &nopts_sp;
00873 av_tree_find(nut->syncpoints, &dummy, (void *) ff_nut_sp_pos_cmp,
00874 (void **) next_node);
00875 pos2= av_gen_search(s, -2, dummy.pos, next_node[0]->pos , next_node[1]->pos, next_node[1]->pos,
00876 next_node[0]->back_ptr, next_node[1]->back_ptr, flags, &ts, nut_read_timestamp);
00877 if(pos2>=0)
00878 pos= pos2;
00879
00880 }
00881 dummy.pos= pos;
00882 sp= av_tree_find(nut->syncpoints, &dummy, (void *) ff_nut_sp_pos_cmp,
00883 NULL);
00884
00885 assert(sp);
00886 pos2= sp->back_ptr - 15;
00887 }
00888 av_log(NULL, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos2);
00889 pos= find_startcode(s->pb, SYNCPOINT_STARTCODE, pos2);
00890 url_fseek(s->pb, pos, SEEK_SET);
00891 av_log(NULL, AV_LOG_DEBUG, "SP: %"PRId64"\n", pos);
00892 if(pos2 > pos || pos2 + 15 < pos){
00893 av_log(NULL, AV_LOG_ERROR, "no syncpoint at backptr pos\n");
00894 }
00895 for(i=0; i<s->nb_streams; i++)
00896 nut->stream[i].skip_until_key_frame=1;
00897
00898 return 0;
00899 }
00900
00901 static int nut_read_close(AVFormatContext *s)
00902 {
00903 NUTContext *nut = s->priv_data;
00904 int i;
00905
00906 av_freep(&nut->time_base);
00907 av_freep(&nut->stream);
00908 ff_nut_free_sp(nut);
00909 for(i = 1; i < nut->header_count; i++)
00910 av_freep(&nut->header[i]);
00911
00912 return 0;
00913 }
00914
00915 #if CONFIG_NUT_DEMUXER
00916 AVInputFormat nut_demuxer = {
00917 "nut",
00918 NULL_IF_CONFIG_SMALL("NUT format"),
00919 sizeof(NUTContext),
00920 nut_probe,
00921 nut_read_header,
00922 nut_read_packet,
00923 nut_read_close,
00924 read_seek,
00925 .extensions = "nut",
00926 .metadata_conv = ff_nut_metadata_conv,
00927 };
00928 #endif
