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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 = CODEC_TYPE_VIDEO;
00319 st->codec->codec_id = codec_get_id(codec_bmp_tags, tmp);
00320 break;
00321 case 1:
00322 st->codec->codec_type = CODEC_TYPE_AUDIO;
00323 st->codec->codec_id = codec_get_id(codec_wav_tags, tmp);
00324 break;
00325 case 2:
00326 st->codec->codec_type = CODEC_TYPE_SUBTITLE;
00327 st->codec->codec_id = codec_get_id(ff_nut_subtitle_tags, tmp);
00328 break;
00329 case 3:
00330 st->codec->codec_type = CODEC_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?!\n");
00338
00339 GET_V(stc->time_base_id , tmp < nut->time_base_count);
00340 GET_V(stc->msb_pts_shift , tmp < 16);
00341 stc->max_pts_distance= ff_get_v(bc);
00342 GET_V(stc->decode_delay , tmp < 1000);
00343 st->codec->has_b_frames= stc->decode_delay;
00344 ff_get_v(bc);
00345
00346 GET_V(st->codec->extradata_size, tmp < (1<<30));
00347 if(st->codec->extradata_size){
00348 st->codec->extradata= av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
00349 get_buffer(bc, st->codec->extradata, st->codec->extradata_size);
00350 }
00351
00352 if (st->codec->codec_type == CODEC_TYPE_VIDEO){
00353 GET_V(st->codec->width , tmp > 0)
00354 GET_V(st->codec->height, tmp > 0)
00355 st->sample_aspect_ratio.num= ff_get_v(bc);
00356 st->sample_aspect_ratio.den= ff_get_v(bc);
00357 if((!st->sample_aspect_ratio.num) != (!st->sample_aspect_ratio.den)){
00358 av_log(s, AV_LOG_ERROR, "invalid aspect ratio %d/%d\n", st->sample_aspect_ratio.num, st->sample_aspect_ratio.den);
00359 return -1;
00360 }
00361 ff_get_v(bc);
00362 }else if (st->codec->codec_type == CODEC_TYPE_AUDIO){
00363 GET_V(st->codec->sample_rate , tmp > 0)
00364 ff_get_v(bc);
00365 GET_V(st->codec->channels, tmp > 0)
00366 }
00367 if(skip_reserved(bc, end) || get_checksum(bc)){
00368 av_log(s, AV_LOG_ERROR, "stream header %d checksum mismatch\n", stream_id);
00369 return -1;
00370 }
00371 stc->time_base= &nut->time_base[stc->time_base_id];
00372 av_set_pts_info(s->streams[stream_id], 63, stc->time_base->num, stc->time_base->den);
00373 return 0;
00374 }
00375
00376 static void set_disposition_bits(AVFormatContext* avf, char* value, int stream_id){
00377 int flag = 0, i;
00378 for (i=0; ff_nut_dispositions[i].flag; ++i) {
00379 if (!strcmp(ff_nut_dispositions[i].str, value))
00380 flag = ff_nut_dispositions[i].flag;
00381 }
00382 if (!flag)
00383 av_log(avf, AV_LOG_INFO, "unknown disposition type '%s'\n", value);
00384 for (i = 0; i < avf->nb_streams; ++i)
00385 if (stream_id == i || stream_id == -1)
00386 avf->streams[i]->disposition |= flag;
00387 }
00388
00389 static int decode_info_header(NUTContext *nut){
00390 AVFormatContext *s= nut->avf;
00391 ByteIOContext *bc = s->pb;
00392 uint64_t tmp;
00393 unsigned int stream_id_plus1, chapter_start, chapter_len, count;
00394 int chapter_id, i;
00395 int64_t value, end;
00396 char name[256], str_value[1024], type_str[256];
00397 const char *type;
00398 AVChapter *chapter= NULL;
00399 AVStream *st= NULL;
00400
00401 end= get_packetheader(nut, bc, 1, INFO_STARTCODE);
00402 end += url_ftell(bc);
00403
00404 GET_V(stream_id_plus1, tmp <= s->nb_streams)
00405 chapter_id = get_s(bc);
00406 chapter_start= ff_get_v(bc);
00407 chapter_len = ff_get_v(bc);
00408 count = ff_get_v(bc);
00409
00410 if(chapter_id && !stream_id_plus1){
00411 int64_t start= chapter_start / nut->time_base_count;
00412 chapter= ff_new_chapter(s, chapter_id,
00413 nut->time_base[chapter_start % nut->time_base_count],
00414 start, start + chapter_len, NULL);
00415 } else if(stream_id_plus1)
00416 st= s->streams[stream_id_plus1 - 1];
00417
00418 for(i=0; i<count; i++){
00419 get_str(bc, name, sizeof(name));
00420 value= get_s(bc);
00421 if(value == -1){
00422 type= "UTF-8";
00423 get_str(bc, str_value, sizeof(str_value));
00424 }else if(value == -2){
00425 get_str(bc, type_str, sizeof(type_str));
00426 type= type_str;
00427 get_str(bc, str_value, sizeof(str_value));
00428 }else if(value == -3){
00429 type= "s";
00430 value= get_s(bc);
00431 }else if(value == -4){
00432 type= "t";
00433 value= ff_get_v(bc);
00434 }else if(value < -4){
00435 type= "r";
00436 get_s(bc);
00437 }else{
00438 type= "v";
00439 }
00440
00441 if (stream_id_plus1 > s->nb_streams) {
00442 av_log(s, AV_LOG_ERROR, "invalid stream id for info packet\n");
00443 continue;
00444 }
00445
00446 if(!strcmp(type, "UTF-8")){
00447 AVMetadata **metadata = NULL;
00448 if(chapter_id==0 && !strcmp(name, "Disposition"))
00449 set_disposition_bits(s, str_value, stream_id_plus1 - 1);
00450 else if(chapter) metadata= &chapter->metadata;
00451 else if(stream_id_plus1) metadata= &st->metadata;
00452 else metadata= &s->metadata;
00453 if(metadata && strcasecmp(name,"Uses")
00454 && strcasecmp(name,"Depends") && strcasecmp(name,"Replaces"))
00455 av_metadata_set(metadata, name, str_value);
00456 }
00457 }
00458
00459 if(skip_reserved(bc, end) || 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 ByteIOContext *bc = s->pb;
00469 int64_t end, tmp;
00470
00471 nut->last_syncpoint_pos= url_ftell(bc)-8;
00472
00473 end= get_packetheader(nut, bc, 1, SYNCPOINT_STARTCODE);
00474 end += url_ftell(bc);
00475
00476 tmp= ff_get_v(bc);
00477 *back_ptr= nut->last_syncpoint_pos - 16*ff_get_v(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) || 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 ByteIOContext *bc = s->pb;
00497 uint64_t tmp, end;
00498 int i, j, syncpoint_count;
00499 int64_t filesize= url_fsize(bc);
00500 int64_t *syncpoints;
00501 int8_t *has_keyframe;
00502 int ret= -1;
00503
00504 url_fseek(bc, filesize-12, SEEK_SET);
00505 url_fseek(bc, filesize-get_be64(bc), SEEK_SET);
00506 if(get_be64(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 += url_ftell(bc);
00513
00514 ff_get_v(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] = ff_get_v(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= ff_get_v(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= ff_get_v(bc);
00561 if(!A){
00562 A= ff_get_v(bc);
00563 B= ff_get_v(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) || 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 ByteIOContext *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 -1;
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 -1;
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= url_ftell(bc);
00627
00628 if(startcode==0){
00629 av_log(s, AV_LOG_ERROR, "EOF before video frames\n");
00630 return -1;
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(!url_is_streamed(bc)){
00644 int64_t orig_pos= url_ftell(bc);
00645 find_and_decode_index(nut);
00646 url_fseek(bc, orig_pos, SEEK_SET);
00647 }
00648 assert(nut->next_startcode == SYNCPOINT_STARTCODE);
00649
00650 return 0;
00651 }
00652
00653 static int decode_frame_header(NUTContext *nut, int64_t *pts, int *stream_id, uint8_t *header_idx, int frame_code){
00654 AVFormatContext *s= nut->avf;
00655 ByteIOContext *bc = s->pb;
00656 StreamContext *stc;
00657 int size, flags, size_mul, pts_delta, i, reserved_count;
00658 uint64_t tmp;
00659
00660 if(url_ftell(bc) > nut->last_syncpoint_pos + nut->max_distance){
00661 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);
00662 return -1;
00663 }
00664
00665 flags = nut->frame_code[frame_code].flags;
00666 size_mul = nut->frame_code[frame_code].size_mul;
00667 size = nut->frame_code[frame_code].size_lsb;
00668 *stream_id = nut->frame_code[frame_code].stream_id;
00669 pts_delta = nut->frame_code[frame_code].pts_delta;
00670 reserved_count = nut->frame_code[frame_code].reserved_count;
00671 *header_idx = nut->frame_code[frame_code].header_idx;
00672
00673 if(flags & FLAG_INVALID)
00674 return -1;
00675 if(flags & FLAG_CODED)
00676 flags ^= ff_get_v(bc);
00677 if(flags & FLAG_STREAM_ID){
00678 GET_V(*stream_id, tmp < s->nb_streams)
00679 }
00680 stc= &nut->stream[*stream_id];
00681 if(flags&FLAG_CODED_PTS){
00682 int coded_pts= ff_get_v(bc);
00683
00684 if(coded_pts < (1<<stc->msb_pts_shift)){
00685 *pts=ff_lsb2full(stc, coded_pts);
00686 }else
00687 *pts=coded_pts - (1<<stc->msb_pts_shift);
00688 }else
00689 *pts= stc->last_pts + pts_delta;
00690 if(flags&FLAG_SIZE_MSB){
00691 size += size_mul*ff_get_v(bc);
00692 }
00693 if(flags&FLAG_MATCH_TIME)
00694 get_s(bc);
00695 if(flags&FLAG_HEADER_IDX)
00696 *header_idx= ff_get_v(bc);
00697 if(flags&FLAG_RESERVED)
00698 reserved_count= ff_get_v(bc);
00699 for(i=0; i<reserved_count; i++)
00700 ff_get_v(bc);
00701
00702 if(*header_idx >= (unsigned)nut->header_count){
00703 av_log(s, AV_LOG_ERROR, "header_idx invalid\n");
00704 return -1;
00705 }
00706 if(size > 4096)
00707 *header_idx=0;
00708 size -= nut->header_len[*header_idx];
00709
00710 if(flags&FLAG_CHECKSUM){
00711 get_be32(bc);
00712 }else if(size > 2*nut->max_distance || FFABS(stc->last_pts - *pts) > stc->max_pts_distance){
00713 av_log(s, AV_LOG_ERROR, "frame size > 2max_distance and no checksum\n");
00714 return -1;
00715 }
00716
00717 stc->last_pts= *pts;
00718 stc->last_flags= flags;
00719
00720 return size;
00721 }
00722
00723 static int decode_frame(NUTContext *nut, AVPacket *pkt, int frame_code){
00724 AVFormatContext *s= nut->avf;
00725 ByteIOContext *bc = s->pb;
00726 int size, stream_id, discard;
00727 int64_t pts, last_IP_pts;
00728 StreamContext *stc;
00729 uint8_t header_idx;
00730
00731 size= decode_frame_header(nut, &pts, &stream_id, &header_idx, frame_code);
00732 if(size < 0)
00733 return -1;
00734
00735 stc= &nut->stream[stream_id];
00736
00737 if (stc->last_flags & FLAG_KEY)
00738 stc->skip_until_key_frame=0;
00739
00740 discard= s->streams[ stream_id ]->discard;
00741 last_IP_pts= s->streams[ stream_id ]->last_IP_pts;
00742 if( (discard >= AVDISCARD_NONKEY && !(stc->last_flags & FLAG_KEY))
00743 ||(discard >= AVDISCARD_BIDIR && last_IP_pts != AV_NOPTS_VALUE && last_IP_pts > pts)
00744 || discard >= AVDISCARD_ALL
00745 || stc->skip_until_key_frame){
00746 url_fskip(bc, size);
00747 return 1;
00748 }
00749
00750 av_new_packet(pkt, size + nut->header_len[header_idx]);
00751 memcpy(pkt->data, nut->header[header_idx], nut->header_len[header_idx]);
00752 pkt->pos= url_ftell(bc);
00753 get_buffer(bc, pkt->data + nut->header_len[header_idx], size);
00754
00755 pkt->stream_index = stream_id;
00756 if (stc->last_flags & FLAG_KEY)
00757 pkt->flags |= PKT_FLAG_KEY;
00758 pkt->pts = pts;
00759
00760 return 0;
00761 }
00762
00763 static int nut_read_packet(AVFormatContext *s, AVPacket *pkt)
00764 {
00765 NUTContext *nut = s->priv_data;
00766 ByteIOContext *bc = s->pb;
00767 int i, frame_code=0, ret, skip;
00768 int64_t ts, back_ptr;
00769
00770 for(;;){
00771 int64_t pos= url_ftell(bc);
00772 uint64_t tmp= nut->next_startcode;
00773 nut->next_startcode=0;
00774
00775 if(tmp){
00776 pos-=8;
00777 }else{
00778 frame_code = get_byte(bc);
00779 if(url_feof(bc))
00780 return -1;
00781 if(frame_code == 'N'){
00782 tmp= frame_code;
00783 for(i=1; i<8; i++)
00784 tmp = (tmp<<8) + get_byte(bc);
00785 }
00786 }
00787 switch(tmp){
00788 case MAIN_STARTCODE:
00789 case STREAM_STARTCODE:
00790 case INDEX_STARTCODE:
00791 skip= get_packetheader(nut, bc, 0, tmp);
00792 url_fseek(bc, skip, SEEK_CUR);
00793 break;
00794 case INFO_STARTCODE:
00795 if(decode_info_header(nut)<0)
00796 goto resync;
00797 break;
00798 case SYNCPOINT_STARTCODE:
00799 if(decode_syncpoint(nut, &ts, &back_ptr)<0)
00800 goto resync;
00801 frame_code = get_byte(bc);
00802 case 0:
00803 ret= decode_frame(nut, pkt, frame_code);
00804 if(ret==0)
00805 return 0;
00806 else if(ret==1)
00807 break;
00808 default:
00809 resync:
00810 av_log(s, AV_LOG_DEBUG, "syncing from %"PRId64"\n", pos);
00811 tmp= find_any_startcode(bc, nut->last_syncpoint_pos+1);
00812 if(tmp==0)
00813 return -1;
00814 av_log(s, AV_LOG_DEBUG, "sync\n");
00815 nut->next_startcode= tmp;
00816 }
00817 }
00818 }
00819
00820 static int64_t nut_read_timestamp(AVFormatContext *s, int stream_index, int64_t *pos_arg, int64_t pos_limit){
00821 NUTContext *nut = s->priv_data;
00822 ByteIOContext *bc = s->pb;
00823 int64_t pos, pts, back_ptr;
00824 av_log(s, AV_LOG_DEBUG, "read_timestamp(X,%d,%"PRId64",%"PRId64")\n", stream_index, *pos_arg, pos_limit);
00825
00826 pos= *pos_arg;
00827 do{
00828 pos= find_startcode(bc, SYNCPOINT_STARTCODE, pos)+1;
00829 if(pos < 1){
00830 assert(nut->next_startcode == 0);
00831 av_log(s, AV_LOG_ERROR, "read_timestamp failed.\n");
00832 return AV_NOPTS_VALUE;
00833 }
00834 }while(decode_syncpoint(nut, &pts, &back_ptr) < 0);
00835 *pos_arg = pos-1;
00836 assert(nut->last_syncpoint_pos == *pos_arg);
00837
00838 av_log(s, AV_LOG_DEBUG, "return %"PRId64" %"PRId64"\n", pts,back_ptr );
00839 if (stream_index == -1) return pts;
00840 else if(stream_index == -2) return back_ptr;
00841
00842 assert(0);
00843 }
00844
00845 static int read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags){
00846 NUTContext *nut = s->priv_data;
00847 AVStream *st= s->streams[stream_index];
00848 Syncpoint dummy={.ts= pts*av_q2d(st->time_base)*AV_TIME_BASE};
00849 Syncpoint nopts_sp= {.ts= AV_NOPTS_VALUE, .back_ptr= AV_NOPTS_VALUE};
00850 Syncpoint *sp, *next_node[2]= {&nopts_sp, &nopts_sp};
00851 int64_t pos, pos2, ts;
00852 int i;
00853
00854 if(st->index_entries){
00855 int index= av_index_search_timestamp(st, pts, flags);
00856 if(index<0)
00857 return -1;
00858
00859 pos2= st->index_entries[index].pos;
00860 ts = st->index_entries[index].timestamp;
00861 }else{
00862 av_tree_find(nut->syncpoints, &dummy, ff_nut_sp_pts_cmp, next_node);
00863 av_log(s, AV_LOG_DEBUG, "%"PRIu64"-%"PRIu64" %"PRId64"-%"PRId64"\n", next_node[0]->pos, next_node[1]->pos,
00864 next_node[0]->ts , next_node[1]->ts);
00865 pos= av_gen_search(s, -1, dummy.ts, next_node[0]->pos, next_node[1]->pos, next_node[1]->pos,
00866 next_node[0]->ts , next_node[1]->ts, AVSEEK_FLAG_BACKWARD, &ts, nut_read_timestamp);
00867
00868 if(!(flags & AVSEEK_FLAG_BACKWARD)){
00869 dummy.pos= pos+16;
00870 next_node[1]= &nopts_sp;
00871 av_tree_find(nut->syncpoints, &dummy, ff_nut_sp_pos_cmp, next_node);
00872 pos2= av_gen_search(s, -2, dummy.pos, next_node[0]->pos , next_node[1]->pos, next_node[1]->pos,
00873 next_node[0]->back_ptr, next_node[1]->back_ptr, flags, &ts, nut_read_timestamp);
00874 if(pos2>=0)
00875 pos= pos2;
00876
00877 }
00878 dummy.pos= pos;
00879 sp= av_tree_find(nut->syncpoints, &dummy, ff_nut_sp_pos_cmp, NULL);
00880
00881 assert(sp);
00882 pos2= sp->back_ptr - 15;
00883 }
00884 av_log(NULL, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos2);
00885 pos= find_startcode(s->pb, SYNCPOINT_STARTCODE, pos2);
00886 url_fseek(s->pb, pos, SEEK_SET);
00887 av_log(NULL, AV_LOG_DEBUG, "SP: %"PRId64"\n", pos);
00888 if(pos2 > pos || pos2 + 15 < pos){
00889 av_log(NULL, AV_LOG_ERROR, "no syncpoint at backptr pos\n");
00890 }
00891 for(i=0; i<s->nb_streams; i++)
00892 nut->stream[i].skip_until_key_frame=1;
00893
00894 return 0;
00895 }
00896
00897 static int nut_read_close(AVFormatContext *s)
00898 {
00899 NUTContext *nut = s->priv_data;
00900
00901 av_freep(&nut->time_base);
00902 av_freep(&nut->stream);
00903
00904 return 0;
00905 }
00906
00907 #if CONFIG_NUT_DEMUXER
00908 AVInputFormat nut_demuxer = {
00909 "nut",
00910 NULL_IF_CONFIG_SMALL("NUT format"),
00911 sizeof(NUTContext),
00912 nut_probe,
00913 nut_read_header,
00914 nut_read_packet,
00915 nut_read_close,
00916 read_seek,
00917 .extensions = "nut",
00918 };
00919 #endif
