2 * "NUT" Container Format muxer and demuxer (DRAFT-200403??)
3 * Copyright (c) 2003 Alex Beregszaszi
4 * Copyright (c) 2004 Michael Niedermayer
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 * NUT DRAFT can be found in MPlayer CVS at DOCS/tech/mpcf.txt
22 * AND http://people.fsn.hu/~alex/nut/ (TeX, pdf, ps, dvi, ..)
30 * - index packet reading support
31 * - startcode searching for broken streams
38 #include "mpegaudio.h"
46 #define MAIN_STARTCODE (0x7A561F5F04ADULL + (((uint64_t)('N'<<8) + 'M')<<48))
47 #define STREAM_STARTCODE (0x11405BF2F9DBULL + (((uint64_t)('N'<<8) + 'S')<<48))
48 #define KEYFRAME_STARTCODE (0xE4ADEECA4569ULL + (((uint64_t)('N'<<8) + 'K')<<48))
49 #define INDEX_STARTCODE (0xDD672F23E64EULL + (((uint64_t)('N'<<8) + 'X')<<48))
50 #define INFO_STARTCODE (0xAB68B596BA78ULL + (((uint64_t)('N'<<8) + 'I')<<48))
52 #define MAX_TYPE1_DISTANCE (1024*16-1)
53 #define MAX_TYPE2_DISTANCE (1024*64-1)
55 #define MAX_SIZE_LRU 2
58 #define FLAG_FRAME_TYPE 1
59 #define FLAG_DATA_SIZE 2
61 #define FLAG_FULL_PTS 4
62 #define FLAG_KEY_FRAME 32
63 #define FLAG_PRED_KEY_FRAME 64
67 uint8_t stream_id_plus1;
74 int msb_timestamp_shift;
78 int64_t last_full_pts;
79 int lru_pts_delta[MAX_PTS_LRU];
80 int lru_size[MAX_SIZE_LRU];
81 int initial_pts_predictor[MAX_PTS_LRU];
82 int initial_size_predictor[MAX_SIZE_LRU];
88 int64_t last_packet_start;
89 int written_packet_size;
90 int64_t packet_size_pos;
91 int64_t last_frame_start[3];
92 FrameCode frame_code[256];
93 StreamContext *stream;
96 static char *info_table[][2]={
97 {NULL , NULL }, // end
104 {"StartTimestamp" , "v"},
105 {"EndTimestamp" , "v"},
108 {"Description" , "UTF8"},
109 {"Copyright" , "UTF8"},
110 {"Encoder" , "UTF8"},
111 {"Keyword" , "UTF8"},
116 static void update_lru(int *lru, int current, int count){
119 for(i=0; i<count-1; i++){
120 if(lru[i] == current)
131 static void update(NUTContext *nut, int stream_index, int64_t frame_start, int frame_type, int frame_code, int key_frame, int size, int64_t pts){
132 StreamContext *stream= &nut->stream[stream_index];
134 stream->last_key_frame= key_frame;
135 nut->last_frame_start[ frame_type ]= frame_start;
136 update_lru(stream->lru_pts_delta, pts - stream->last_pts, 3);
137 update_lru(stream->lru_size , size, 2);
138 stream->last_pts= pts;
139 if( nut->frame_code[frame_code].flags & FLAG_PTS
140 && nut->frame_code[frame_code].flags & FLAG_FULL_PTS)
141 stream->last_full_pts= pts;
144 static void reset(AVFormatContext *s/*, int frame_type*/){
145 NUTContext *nut = s->priv_data;
148 for(i=0; i<s->nb_streams; i++){
149 StreamContext *stream= &nut->stream[i];
151 stream->last_key_frame= 1;
152 memcpy(stream->lru_pts_delta, stream->initial_pts_predictor, sizeof(int)*MAX_PTS_LRU);
153 memcpy(stream->lru_size, stream->initial_size_predictor, sizeof(int)*MAX_SIZE_LRU);
157 static void build_frame_code(AVFormatContext *s){
158 NUTContext *nut = s->priv_data;
159 int key_frame, frame_type, full_pts, index, pred, stream_id;
162 int keyframe_0_esc= s->nb_streams > 2;
165 /* keyframe = 0 escapes, 3 codes */
166 for(frame_type=0; frame_type<2; frame_type++){
167 for(full_pts=frame_type; full_pts<2; full_pts++){
168 FrameCode *ft= &nut->frame_code[start];
169 ft->flags= FLAG_FRAME_TYPE*frame_type + FLAG_FULL_PTS*full_pts;
170 ft->flags|= FLAG_DATA_SIZE | FLAG_PTS;
171 ft->stream_id_plus1= 0;
178 for(stream_id= 0; stream_id<s->nb_streams; stream_id++){
179 int start2= start + (end-start)*stream_id / s->nb_streams;
180 int end2 = start + (end-start)*(stream_id+1) / s->nb_streams;
181 AVCodecContext *codec = &s->streams[stream_id]->codec;
182 int is_audio= codec->codec_type == CODEC_TYPE_AUDIO;
183 int intra_only= /*codec->intra_only || */is_audio;
186 for(key_frame=0; key_frame<2; key_frame++){
187 if(intra_only && keyframe_0_esc && key_frame==0)
190 for(frame_type=0; frame_type<2; frame_type++){
191 for(full_pts=frame_type; full_pts<2; full_pts++){
192 FrameCode *ft= &nut->frame_code[start2];
193 ft->flags= FLAG_FRAME_TYPE*frame_type + FLAG_FULL_PTS*full_pts + FLAG_KEY_FRAME*key_frame;
194 ft->flags|= FLAG_DATA_SIZE | FLAG_PTS;
195 ft->stream_id_plus1= stream_id + 1;
202 key_frame= intra_only;
205 int frame_bytes= codec->frame_size*(int64_t)codec->bit_rate / (8*codec->sample_rate);
206 for(pred=0; pred<MAX_SIZE_LRU; pred++){
207 for(frame_type=0; frame_type<1; frame_type++){
208 FrameCode *ft= &nut->frame_code[start2];
209 ft->flags= FLAG_KEY_FRAME*key_frame + (FLAG_FULL_PTS+FLAG_PTS+FLAG_FRAME_TYPE)*frame_type;
210 ft->stream_id_plus1= stream_id + 1;
212 ft->size_lsb=1 + pred;
215 nut->stream[stream_id].initial_size_predictor[pred]= frame_bytes + pred;
218 FrameCode *ft= &nut->frame_code[start2];
219 ft->flags= FLAG_KEY_FRAME | FLAG_DATA_SIZE;
220 ft->stream_id_plus1= stream_id + 1;
225 pred_count= 2 + codec->has_b_frames + (codec->codec_id == CODEC_ID_VORBIS);
226 for(pred=0; pred<pred_count; pred++){
227 int start3= start2 + (end2-start2)*pred / pred_count;
228 int end3 = start2 + (end2-start2)*(pred+1) / pred_count;
230 for(index=start3; index<end3; index++){
231 FrameCode *ft= &nut->frame_code[index];
232 ft->flags= FLAG_KEY_FRAME*key_frame + pred*4;
233 ft->flags|= FLAG_DATA_SIZE;
234 ft->stream_id_plus1= stream_id + 1;
235 //FIXME use single byte size and pred from last
236 ft->size_mul= end3-start3;
237 ft->size_lsb= index - start3;
239 nut->stream[stream_id].initial_pts_predictor[pred]= pred+1;
242 memmove(&nut->frame_code['N'+1], &nut->frame_code['N'], sizeof(FrameCode)*(255-'N'));
243 nut->frame_code['N'].flags= 1;
246 static int bytes_left(ByteIOContext *bc)
248 return bc->buf_end - bc->buf_ptr;
251 static uint64_t get_v(ByteIOContext *bc)
255 for(; bytes_left(bc) > 0; )
257 int tmp = get_byte(bc);
260 val= (val<<7) + tmp - 0x80;
262 return (val<<7) + tmp;
267 static int get_str(ByteIOContext *bc, char *string, int maxlen){
271 get_buffer(bc, string, FFMIN(len, maxlen));
278 string[FFMIN(len, maxlen-1)]= 0;
286 static int get_packetheader(NUTContext *nut, ByteIOContext *bc, int prefix_length, int calculate_checksum)
288 int64_t start, size, last_size;
289 start= url_ftell(bc) - prefix_length;
291 if(start != nut->packet_start + nut->written_packet_size){
292 av_log(nut->avf, AV_LOG_ERROR, "get_packetheader called at weird position\n");
296 if(calculate_checksum)
297 init_checksum(bc, update_adler32, 0);
300 last_size= get_v(bc);
301 if(nut->written_packet_size != last_size){
302 av_log(nut->avf, AV_LOG_ERROR, "packet size missmatch %d != %lld at %lld\n", nut->written_packet_size, last_size, start);
306 nut->last_packet_start = nut->packet_start;
307 nut->packet_start = start;
308 nut->written_packet_size= size;
313 static int check_checksum(ByteIOContext *bc){
314 unsigned long checksum= get_checksum(bc);
315 return checksum != get_be32(bc);
321 static int get_length(uint64_t val){
328 return 7; //not reached
331 #ifdef CONFIG_ENCODERS
332 static int put_v(ByteIOContext *bc, uint64_t val)
335 // if (bytes_left(s)*8 < 9)
338 if (bytes_left(bc) < 1)
341 val &= 0x7FFFFFFFFFFFFFFFULL; // FIXME can only encode upto 63 bits currently
344 for (i-=7; i>0; i-=7){
345 put_byte(bc, 0x80 | (val>>i));
348 put_byte(bc, val&0x7f);
353 static int put_str(ByteIOContext *bc, const char *string){
354 int len= strlen(string);
357 put_buffer(bc, string, len);
362 static int put_packetheader(NUTContext *nut, ByteIOContext *bc, int max_size, int calculate_checksum)
364 put_flush_packet(bc);
365 nut->last_packet_start= nut->packet_start;
366 nut->packet_start+= nut->written_packet_size;
367 nut->packet_size_pos = url_ftell(bc);
368 nut->written_packet_size = max_size;
370 if(calculate_checksum)
371 init_checksum(bc, update_adler32, 0);
374 put_v(bc, nut->written_packet_size); /* forward ptr */
375 put_v(bc, nut->packet_start - nut->last_packet_start); /* backward ptr */
380 static int update_packetheader(NUTContext *nut, ByteIOContext *bc, int additional_size, int calculate_checksum){
381 int64_t start= nut->packet_start;
382 int64_t cur= url_ftell(bc);
383 int size= cur - start + additional_size;
385 if(calculate_checksum)
388 if(size != nut->written_packet_size){
391 assert( size <= nut->written_packet_size );
393 url_fseek(bc, nut->packet_size_pos, SEEK_SET);
394 for(i=get_length(size); i < get_length(nut->written_packet_size); i+=7)
398 url_fseek(bc, cur, SEEK_SET);
399 nut->written_packet_size= size; //FIXME may fail if multiple updates with differing sizes, as get_length may differ
401 if(calculate_checksum)
402 put_be32(bc, get_checksum(bc));
408 static int nut_write_header(AVFormatContext *s)
410 NUTContext *nut = s->priv_data;
411 ByteIOContext *bc = &s->pb;
412 AVCodecContext *codec;
418 av_mallocz(sizeof(StreamContext)*s->nb_streams);
420 av_set_pts_info(s, 60, 1, AV_TIME_BASE);
423 put_be64(bc, MAIN_STARTCODE);
424 put_packetheader(nut, bc, 120+5*256, 1);
425 put_v(bc, 1); /* version */
426 put_v(bc, s->nb_streams);
430 assert(nut->frame_code['N'].flags == 1);
432 int tmp_flags = nut->frame_code[i].flags;
433 int tmp_stream= nut->frame_code[i].stream_id_plus1;
434 int tmp_mul = nut->frame_code[i].size_mul;
435 int tmp_size = nut->frame_code[i].size_lsb;
436 put_v(bc, tmp_flags);
437 put_v(bc, tmp_stream);
441 for(j=0; i<256; j++,i++){
442 if(nut->frame_code[i].flags != tmp_flags ) break;
443 if(nut->frame_code[i].stream_id_plus1 != tmp_stream) break;
444 if(nut->frame_code[i].size_mul != tmp_mul ) break;
445 if(nut->frame_code[i].size_lsb != tmp_size ) break;
446 if(++tmp_size >= tmp_mul){
454 update_packetheader(nut, bc, 0, 1);
457 for (i = 0; i < s->nb_streams; i++)
461 codec = &s->streams[i]->codec;
463 put_be64(bc, STREAM_STARTCODE);
464 put_packetheader(nut, bc, 120 + codec->extradata_size, 1);
465 put_v(bc, i /*s->streams[i]->index*/);
466 put_v(bc, (codec->codec_type == CODEC_TYPE_AUDIO) ? 32 : 0);
467 if (codec->codec_tag)
468 put_v(bc, codec->codec_tag);
469 else if (codec->codec_type == CODEC_TYPE_VIDEO)
471 put_v(bc, codec_get_bmp_tag(codec->codec_id));
473 else if (codec->codec_type == CODEC_TYPE_AUDIO)
475 put_v(bc, codec_get_wav_tag(codec->codec_id));
480 if (codec->codec_type == CODEC_TYPE_VIDEO)
482 nom = codec->frame_rate;
483 denom = codec->frame_rate_base;
487 nom = codec->sample_rate;
488 if(codec->frame_size>0)
489 denom= codec->frame_size;
493 gcd= ff_gcd(nom, denom);
496 nut->stream[i].rate_num= nom;
497 nut->stream[i].rate_den= denom;
499 put_v(bc, codec->bit_rate);
500 put_v(bc, 0); /* no language code */
503 if(nom / denom < 1000)
504 nut->stream[i].msb_timestamp_shift = 7;
506 nut->stream[i].msb_timestamp_shift = 14;
507 put_v(bc, nut->stream[i].msb_timestamp_shift);
509 put_v(bc, nut->stream[i].initial_pts_predictor[j]);
511 put_v(bc, nut->stream[i].initial_size_predictor[j]);
512 put_byte(bc, 0); /* flags: 0x1 - fixed_fps, 0x2 - index_present */
514 if(codec->extradata_size){
516 put_v(bc, codec->extradata_size);
517 put_buffer(bc, codec->extradata, codec->extradata_size);
519 put_v(bc, 0); /* end of codec specific headers */
521 switch(codec->codec_type)
523 case CODEC_TYPE_AUDIO:
524 put_v(bc, (codec->sample_rate * denom) / nom);
525 put_v(bc, codec->channels);
527 case CODEC_TYPE_VIDEO:
528 put_v(bc, codec->width);
529 put_v(bc, codec->height);
530 put_v(bc, codec->sample_aspect_ratio.num);
531 put_v(bc, codec->sample_aspect_ratio.den);
532 put_v(bc, 0); /* csp type -- unknown */
537 update_packetheader(nut, bc, 0, 1);
541 put_be64(bc, INFO_STARTCODE);
542 put_packetheader(nut, bc, 30+strlen(s->author)+strlen(s->title)+
543 strlen(s->comment)+strlen(s->copyright)+strlen(LIBAVFORMAT_IDENT), 1);
546 put_v(bc, 9); /* type */
547 put_str(bc, s->author);
551 put_v(bc, 10); /* type */
552 put_str(bc, s->title);
556 put_v(bc, 11); /* type */
557 put_str(bc, s->comment);
561 put_v(bc, 12); /* type */
562 put_str(bc, s->copyright);
565 put_v(bc, 13); /* type */
566 put_str(bc, LIBAVFORMAT_IDENT);
568 put_v(bc, 0); /* eof info */
569 update_packetheader(nut, bc, 0, 1);
571 put_flush_packet(bc);
576 static int nut_write_packet(AVFormatContext *s, int stream_index,
577 const uint8_t *buf, int size, int64_t pts)
579 NUTContext *nut = s->priv_data;
580 StreamContext *stream= &nut->stream[stream_index];
581 ByteIOContext *bc = &s->pb;
582 int key_frame = 0, full_pts=0;
584 int64_t lsb_pts, delta_pts;
585 int frame_type, best_length, frame_code, flags, i, size_mul, size_lsb;
586 const int64_t frame_start= url_ftell(bc);
588 if (stream_index > s->nb_streams)
591 pts= (av_rescale(pts, stream->rate_num, stream->rate_den) + AV_TIME_BASE/2) / AV_TIME_BASE;
593 enc = &s->streams[stream_index]->codec;
594 key_frame = enc->coded_frame->key_frame;
595 delta_pts= pts - stream->last_pts;
598 if(frame_start + size + 20 - FFMAX(nut->last_frame_start[1], nut->last_frame_start[2]) > MAX_TYPE1_DISTANCE)
601 if(frame_type==1 && frame_start + size - nut->last_frame_start[2] > MAX_TYPE2_DISTANCE)
603 if(!stream->last_key_frame)
608 update_packetheader(nut, bc, 0, 0);
612 //FIXME ensure that the timestamp can be represented by either delta or lsb or full_pts=1
614 lsb_pts = pts & ((1 << stream->msb_timestamp_shift)-1);
618 for(i=0; i<256; i++){
619 int stream_id_plus1= nut->frame_code[i].stream_id_plus1;
620 int fc_key_frame= stream->last_key_frame;
622 size_mul= nut->frame_code[i].size_mul;
623 size_lsb= nut->frame_code[i].size_lsb;
624 flags= nut->frame_code[i].flags;
626 if(stream_id_plus1 == 0) length+= get_length(stream_index);
627 else if(stream_id_plus1 - 1 != stream_index)
629 if(flags & FLAG_PRED_KEY_FRAME){
630 if(flags & FLAG_KEY_FRAME)
631 fc_key_frame= !fc_key_frame;
633 fc_key_frame= !!(flags & FLAG_KEY_FRAME);
635 assert(key_frame==0 || key_frame==1);
636 if(fc_key_frame != key_frame)
639 if((!!(flags & FLAG_FRAME_TYPE)) != (frame_type > 0))
642 if(size_mul <= size_lsb){
643 int p= stream->lru_size[size_lsb - size_mul];
647 if(size % size_mul != size_lsb)
649 if(flags & FLAG_DATA_SIZE)
650 length += get_length(size / size_mul);
651 else if(size/size_mul)
655 if(full_pts != ((flags & FLAG_PTS) && (flags & FLAG_FULL_PTS)))
659 if(flags&FLAG_FULL_PTS){
660 length += get_length(pts);
662 length += get_length(lsb_pts);
665 int delta= stream->lru_pts_delta[(flags & 12)>>2];
666 if(delta != pts - stream->last_pts)
668 assert(frame_type == 0);
671 if(length < best_length){
675 // av_log(s, AV_LOG_DEBUG, "%d %d %d %d %d %d %d %d %d %d\n", key_frame, frame_type, full_pts, size, stream_index, flags, size_mul, size_lsb, stream_id_plus1, length);
678 assert(frame_code != -1);
679 flags= nut->frame_code[frame_code].flags;
680 size_mul= nut->frame_code[frame_code].size_mul;
681 size_lsb= nut->frame_code[frame_code].size_lsb;
684 best_length ++; //frame_code
686 best_length += 4; //packet header
688 best_length += 8; // startcode
690 av_log(s, AV_LOG_DEBUG, "kf:%d ft:%d pt:%d fc:%2X len:%2d size:%d stream:%d flag:%d mul:%d lsb:%d s+1:%d pts_delta:%d\n", key_frame, frame_type, full_pts ? 2 : ((flags & FLAG_PTS) ? 1 : 0), frame_code, best_length, size, stream_index, flags, size_mul, size_lsb, nut->frame_code[frame_code].stream_id_plus1,(int)(pts - stream->last_pts));
694 put_be64(bc, KEYFRAME_STARTCODE);
695 put_byte(bc, frame_code);
698 put_packetheader(nut, bc, FFMAX(size+20, MAX_TYPE1_DISTANCE), 0);
699 if(nut->frame_code[frame_code].stream_id_plus1 == 0)
700 put_v(bc, stream_index);
701 if (flags & FLAG_PTS){
702 if (flags & FLAG_FULL_PTS)
707 if(flags & FLAG_DATA_SIZE)
708 put_v(bc, size / size_mul);
709 if(size > MAX_TYPE1_DISTANCE){
710 assert(frame_type > 0);
711 update_packetheader(nut, bc, size, 0);
714 put_buffer(bc, buf, size);
716 update(nut, stream_index, frame_start, frame_type, frame_code, key_frame, size, pts);
721 static int nut_write_trailer(AVFormatContext *s)
723 NUTContext *nut = s->priv_data;
724 ByteIOContext *bc = &s->pb;
726 update_packetheader(nut, bc, 0, 0);
733 for (i = 0; s->nb_streams; i++)
735 put_be64(bc, INDEX_STARTCODE);
736 put_packetheader(nut, bc, 64, 1);
737 put_v(bc, s->streams[i]->id);
739 update_packetheader(nut, bc, 0, 1);
743 put_flush_packet(bc);
745 av_freep(&nut->stream);
749 #endif //CONFIG_ENCODERS
751 static int nut_probe(AVProbeData *p)
757 for (i = 0; i < p->buf_size; i++) {
759 code = (code << 8) | c;
760 if (code == MAIN_STARTCODE)
761 return AVPROBE_SCORE_MAX;
766 static int nut_read_header(AVFormatContext *s, AVFormatParameters *ap)
768 NUTContext *nut = s->priv_data;
769 ByteIOContext *bc = &s->pb;
771 int cur_stream, nb_streams, i, j;
775 av_set_pts_info(s, 60, 1, AV_TIME_BASE);
779 if (tmp != MAIN_STARTCODE)
780 av_log(s, AV_LOG_ERROR, "damaged? startcode!=1 (%Ld)\n", tmp);
781 get_packetheader(nut, bc, 8, 1);
785 av_log(s, AV_LOG_ERROR, "bad version (%Ld)\n", tmp);
787 nb_streams = get_v(bc);
788 get_v(bc); //checksum threshold
791 int tmp_flags = get_v(bc);
792 int tmp_stream= get_v(bc);
793 int tmp_mul = get_v(bc);
794 int tmp_size = get_v(bc);
795 int count = get_v(bc);
797 if(count == 0 || i+count > 256){
798 av_log(s, AV_LOG_ERROR, "illegal count %d at %d\n", count, i);
802 if((tmp_flags & FLAG_FRAME_TYPE) && tmp_flags != 1){
803 if(tmp_flags & FLAG_PRED_KEY_FRAME){
804 av_log(s, AV_LOG_ERROR, "keyframe prediction in non 0 frame type\n");
807 if(!(tmp_flags & FLAG_PTS) || !(tmp_flags & FLAG_FULL_PTS) ){
808 av_log(s, AV_LOG_ERROR, "no full pts in non 0 frame type\n");
813 for(j=0; j<count; j++,i++){
814 if(tmp_stream > nb_streams + 1){
815 av_log(s, AV_LOG_ERROR, "illegal stream number\n");
819 nut->frame_code[i].flags = tmp_flags ;
820 nut->frame_code[i].stream_id_plus1 = tmp_stream;
821 nut->frame_code[i].size_mul = tmp_mul ;
822 nut->frame_code[i].size_lsb = tmp_size ;
823 if(++tmp_size >= tmp_mul){
829 if(nut->frame_code['N'].flags != 1){
830 av_log(s, AV_LOG_ERROR, "illegal frame_code table\n");
834 if(check_checksum(bc)){
835 av_log(s, AV_LOG_ERROR, "Main header checksum missmatch\n");
841 nut->stream = av_malloc(sizeof(StreamContext)*nb_streams);
844 for (cur_stream = 0; cur_stream < nb_streams; cur_stream++)
846 int class, nom, denom;
850 if (tmp != STREAM_STARTCODE)
851 av_log(s, AV_LOG_ERROR, "damaged? startcode!=1 (%Ld)\n", tmp);
852 get_packetheader(nut, bc, 8, 1);
853 st = av_new_stream(s, get_v(bc));
855 return AVERROR_NOMEM;
861 st->codec.codec_type = CODEC_TYPE_VIDEO;
862 st->codec.codec_id = codec_get_bmp_id(tmp);
863 if (st->codec.codec_id == CODEC_ID_NONE)
864 av_log(s, AV_LOG_ERROR, "Unknown codec?!\n");
867 st->codec.codec_type = CODEC_TYPE_AUDIO;
868 st->codec.codec_id = codec_get_wav_id(tmp);
869 if (st->codec.codec_id == CODEC_ID_NONE)
870 av_log(s, AV_LOG_ERROR, "Unknown codec?!\n");
873 av_log(s, AV_LOG_ERROR, "Unknown stream class (%d)\n", class);
876 s->bit_rate += get_v(bc);
877 get_v(bc); /* language code */
880 nut->stream[cur_stream].msb_timestamp_shift = get_v(bc);
882 nut->stream[cur_stream].initial_pts_predictor[i]= get_v(bc);
884 nut->stream[cur_stream].initial_size_predictor[i]= get_v(bc);
885 get_byte(bc); /* flags */
887 /* codec specific data headers */
888 while(get_v(bc) != 0){
889 st->codec.extradata_size= get_v(bc);
890 st->codec.extradata= av_mallocz(st->codec.extradata_size);
891 get_buffer(bc, st->codec.extradata, st->codec.extradata_size);
892 // url_fskip(bc, get_v(bc));
895 if (class == 0) /* VIDEO */
897 st->codec.width = get_v(bc);
898 st->codec.height = get_v(bc);
899 st->codec.sample_aspect_ratio.num= get_v(bc);
900 st->codec.sample_aspect_ratio.den= get_v(bc);
901 get_v(bc); /* csp type */
903 st->codec.frame_rate = nom;
904 st->codec.frame_rate_base = denom;
906 if (class == 32) /* AUDIO */
908 st->codec.sample_rate = (get_v(bc) * nom) / denom;
909 st->codec.channels = get_v(bc);
911 if(check_checksum(bc)){
912 av_log(s, AV_LOG_ERROR, "Stream header %d checksum missmatch\n", cur_stream);
915 nut->stream[cur_stream].rate_num= nom;
916 nut->stream[cur_stream].rate_den= denom;
920 if (tmp == INFO_STARTCODE){
921 get_packetheader(nut, bc, 8, 1);
925 char *name, *type, custom_name[256], custom_type[256];
929 else if(id >= sizeof(info_table)/sizeof(info_table[0])){
930 av_log(s, AV_LOG_ERROR, "info id is too large %d %d\n", id, sizeof(info_table)/sizeof(info_table[0]));
934 type= info_table[id][1];
935 name= info_table[id][0];
936 //av_log(s, AV_LOG_DEBUG, "%d %s %s\n", id, type, name);
939 get_str(bc, custom_type, sizeof(custom_type));
943 get_str(bc, custom_name, sizeof(custom_name));
947 if(!strcmp(type, "v")){
948 int value= get_v(bc);
950 if(!strcmp(name, "Author"))
951 get_str(bc, s->author, sizeof(s->author));
952 else if(!strcmp(name, "Title"))
953 get_str(bc, s->title, sizeof(s->title));
954 else if(!strcmp(name, "Copyright"))
955 get_str(bc, s->copyright, sizeof(s->copyright));
956 else if(!strcmp(name, "Description"))
957 get_str(bc, s->comment, sizeof(s->comment));
959 get_str(bc, NULL, 0);
962 if(check_checksum(bc)){
963 av_log(s, AV_LOG_ERROR, "Info header checksum missmatch\n");
966 url_fseek(bc, -8, SEEK_CUR);
971 static int nut_read_packet(AVFormatContext *s, AVPacket *pkt)
973 NUTContext *nut = s->priv_data;
974 StreamContext *stream;
975 ByteIOContext *bc = &s->pb;
976 int size, frame_code, flags, size_mul, size_lsb, stream_id;
980 const int64_t frame_start= url_ftell(bc);
985 frame_code = get_byte(bc);
986 if(frame_code == 'N'){
987 uint64_t tmp= frame_code;
988 tmp<<=8 ; tmp |= get_byte(bc);
989 tmp<<=16; tmp |= get_be16(bc);
990 tmp<<=32; tmp |= get_be32(bc);
991 if (tmp == KEYFRAME_STARTCODE)
993 frame_code = get_byte(bc);
997 av_log(s, AV_LOG_ERROR, "error in zero bit / startcode %LX\n", tmp);
999 flags= nut->frame_code[frame_code].flags;
1000 size_mul= nut->frame_code[frame_code].size_mul;
1001 size_lsb= nut->frame_code[frame_code].size_lsb;
1002 stream_id= nut->frame_code[frame_code].stream_id_plus1 - 1;
1004 if(flags & FLAG_FRAME_TYPE){
1007 get_packetheader(nut, bc, 8+1, 0);
1009 get_packetheader(nut, bc, 1, 0);
1015 stream_id= get_v(bc);
1016 if(stream_id >= s->nb_streams){
1017 av_log(s, AV_LOG_ERROR, "illegal stream_id\n");
1020 stream= &nut->stream[stream_id];
1022 if(flags & FLAG_PRED_KEY_FRAME){
1023 if(flags & FLAG_KEY_FRAME)
1024 key_frame= !stream->last_key_frame;
1026 key_frame= stream->last_key_frame;
1028 key_frame= !!(flags & FLAG_KEY_FRAME);
1031 if(flags & FLAG_PTS){
1032 if(flags & FLAG_FULL_PTS){
1035 int64_t mask = (1<<stream->msb_timestamp_shift)-1;
1036 int64_t delta= stream->last_pts - mask/2;
1037 pts= ((get_v(bc) - delta)&mask) + delta;
1040 pts= stream->last_pts + stream->lru_pts_delta[(flags&12)>>2];
1043 if(size_mul <= size_lsb){
1044 size= stream->lru_size[size_lsb - size_mul];
1046 if(flags & FLAG_DATA_SIZE)
1047 size= size_mul*get_v(bc) + size_lsb;
1052 //av_log(s, AV_LOG_DEBUG, "fs:%lld fc:%d ft:%d kf:%d pts:%lld\n", frame_start, frame_code, frame_type, key_frame, pts);
1054 av_new_packet(pkt, size);
1055 get_buffer(bc, pkt->data, size);
1056 pkt->stream_index = stream_id;
1058 pkt->flags |= PKT_FLAG_KEY;
1059 pkt->pts = pts * AV_TIME_BASE * stream->rate_den / stream->rate_num;
1061 update(nut, stream_id, frame_start, frame_type, frame_code, key_frame, size, pts);
1066 static int nut_read_close(AVFormatContext *s)
1068 NUTContext *nut = s->priv_data;
1071 for(i=0;i<s->nb_streams;i++) {
1072 av_freep(&s->streams[i]->codec.extradata);
1074 av_freep(&nut->stream);
1079 static AVInputFormat nut_iformat = {
1088 .extensions = "nut",
1091 #ifdef CONFIG_ENCODERS
1092 static AVOutputFormat nut_oformat = {
1098 #ifdef CONFIG_VORBIS
1100 #elif defined(CONFIG_MP3LAME)
1103 CODEC_ID_MP2, /* AC3 needs liba52 decoder */
1110 #endif //CONFIG_ENCODERS
1114 av_register_input_format(&nut_iformat);
1115 #ifdef CONFIG_ENCODERS
1116 av_register_output_format(&nut_oformat);
1117 #endif //CONFIG_ENCODERS