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
37 #include "mpegaudio.h"
45 #define MAIN_STARTCODE (0x7A561F5F04ADULL + (((uint64_t)('N'<<8) + 'M')<<48))
46 #define STREAM_STARTCODE (0x11405BF2F9DBULL + (((uint64_t)('N'<<8) + 'S')<<48))
47 #define KEYFRAME_STARTCODE (0xE4ADEECA4569ULL + (((uint64_t)('N'<<8) + 'K')<<48))
48 #define INDEX_STARTCODE (0xDD672F23E64EULL + (((uint64_t)('N'<<8) + 'X')<<48))
49 #define INFO_STARTCODE (0xAB68B596BA78ULL + (((uint64_t)('N'<<8) + 'I')<<48))
51 #define MAX_TYPE1_DISTANCE (1024*16-1)
52 #define MAX_TYPE2_DISTANCE (1024*64-1)
54 #define MAX_SIZE_LRU 2
57 #define FLAG_FRAME_TYPE 1
58 #define FLAG_DATA_SIZE 2
60 #define FLAG_FULL_PTS 4
61 #define FLAG_KEY_FRAME 32
62 #define FLAG_PRED_KEY_FRAME 64
66 uint8_t stream_id_plus1;
73 int msb_timestamp_shift;
77 int64_t last_full_pts;
78 int lru_pts_delta[MAX_PTS_LRU];
79 int lru_size[MAX_SIZE_LRU];
80 int initial_pts_predictor[MAX_PTS_LRU];
81 int initial_size_predictor[MAX_SIZE_LRU];
87 int64_t last_packet_start;
88 int written_packet_size;
89 int64_t packet_size_pos;
90 int64_t last_frame_start[3];
91 FrameCode frame_code[256];
93 uint64_t next_startcode; ///< stores the next startcode if it has alraedy been parsed but the stream isnt seekable
94 StreamContext *stream;
97 static char *info_table[][2]={
98 {NULL , NULL }, // end
105 {"StartTimestamp" , "v"},
106 {"EndTimestamp" , "v"},
109 {"Description" , "UTF8"},
110 {"Copyright" , "UTF8"},
111 {"Encoder" , "UTF8"},
112 {"Keyword" , "UTF8"},
117 static void update_lru(int *lru, int current, int count){
120 for(i=0; i<count-1; i++){
121 if(lru[i] == current)
132 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){
133 StreamContext *stream= &nut->stream[stream_index];
134 const int flags=nut->frame_code[frame_code].flags;
136 stream->last_key_frame= key_frame;
137 nut->last_frame_start[ frame_type ]= frame_start;
139 update_lru(stream->lru_pts_delta, pts - stream->last_pts, 3);
140 update_lru(stream->lru_size, size, 2);
141 stream->last_pts= pts;
142 if((flags & FLAG_PTS) && (flags & FLAG_FULL_PTS))
143 stream->last_full_pts= pts;
146 static void reset(AVFormatContext *s/*, int frame_type*/){
147 NUTContext *nut = s->priv_data;
150 for(i=0; i<s->nb_streams; i++){
151 StreamContext *stream= &nut->stream[i];
153 stream->last_key_frame= 1;
154 memcpy(stream->lru_pts_delta, stream->initial_pts_predictor, sizeof(int)*MAX_PTS_LRU);
155 memcpy(stream->lru_size, stream->initial_size_predictor, sizeof(int)*MAX_SIZE_LRU);
159 static void build_frame_code(AVFormatContext *s){
160 NUTContext *nut = s->priv_data;
161 int key_frame, frame_type, full_pts, index, pred, stream_id;
164 int keyframe_0_esc= s->nb_streams > 2;
167 /* keyframe = 0 escapes, 3 codes */
168 for(frame_type=0; frame_type<2; frame_type++){
169 for(full_pts=frame_type; full_pts<2; full_pts++){
170 FrameCode *ft= &nut->frame_code[start];
171 ft->flags= FLAG_FRAME_TYPE*frame_type + FLAG_FULL_PTS*full_pts;
172 ft->flags|= FLAG_DATA_SIZE | FLAG_PTS;
173 ft->stream_id_plus1= 0;
180 for(stream_id= 0; stream_id<s->nb_streams; stream_id++){
181 int start2= start + (end-start)*stream_id / s->nb_streams;
182 int end2 = start + (end-start)*(stream_id+1) / s->nb_streams;
183 AVCodecContext *codec = &s->streams[stream_id]->codec;
184 int is_audio= codec->codec_type == CODEC_TYPE_AUDIO;
185 int intra_only= /*codec->intra_only || */is_audio;
188 for(key_frame=0; key_frame<2; key_frame++){
189 if(intra_only && keyframe_0_esc && key_frame==0)
192 for(frame_type=0; frame_type<2; frame_type++){
193 for(full_pts=frame_type; full_pts<2; full_pts++){
194 FrameCode *ft= &nut->frame_code[start2];
195 ft->flags= FLAG_FRAME_TYPE*frame_type + FLAG_FULL_PTS*full_pts + FLAG_KEY_FRAME*key_frame;
196 ft->flags|= FLAG_DATA_SIZE | FLAG_PTS;
197 ft->stream_id_plus1= stream_id + 1;
204 key_frame= intra_only;
207 int frame_bytes= codec->frame_size*(int64_t)codec->bit_rate / (8*codec->sample_rate);
208 for(pred=0; pred<MAX_SIZE_LRU; pred++){
209 for(frame_type=0; frame_type<1; frame_type++){
210 FrameCode *ft= &nut->frame_code[start2];
211 ft->flags= FLAG_KEY_FRAME*key_frame + (FLAG_FULL_PTS+FLAG_PTS+FLAG_FRAME_TYPE)*frame_type;
212 ft->stream_id_plus1= stream_id + 1;
214 ft->size_lsb=1 + pred;
217 nut->stream[stream_id].initial_size_predictor[pred]= frame_bytes + pred;
220 FrameCode *ft= &nut->frame_code[start2];
221 ft->flags= FLAG_KEY_FRAME | FLAG_DATA_SIZE;
222 ft->stream_id_plus1= stream_id + 1;
227 pred_count= 2 + codec->has_b_frames + (codec->codec_id == CODEC_ID_VORBIS);
228 for(pred=0; pred<pred_count; pred++){
229 int start3= start2 + (end2-start2)*pred / pred_count;
230 int end3 = start2 + (end2-start2)*(pred+1) / pred_count;
232 for(index=start3; index<end3; index++){
233 FrameCode *ft= &nut->frame_code[index];
234 ft->flags= FLAG_KEY_FRAME*key_frame + pred*4;
235 ft->flags|= FLAG_DATA_SIZE;
236 ft->stream_id_plus1= stream_id + 1;
237 //FIXME use single byte size and pred from last
238 ft->size_mul= end3-start3;
239 ft->size_lsb= index - start3;
241 nut->stream[stream_id].initial_pts_predictor[pred]= pred+1;
244 memmove(&nut->frame_code['N'+1], &nut->frame_code['N'], sizeof(FrameCode)*(255-'N'));
245 nut->frame_code['N'].flags= 1;
248 static uint64_t get_v(ByteIOContext *bc)
254 int tmp = get_byte(bc);
257 val= (val<<7) + tmp - 0x80;
259 return (val<<7) + tmp;
264 static int get_str(ByteIOContext *bc, char *string, int maxlen){
268 get_buffer(bc, string, FFMIN(len, maxlen));
275 string[FFMIN(len, maxlen-1)]= 0;
283 static int get_packetheader(NUTContext *nut, ByteIOContext *bc, int prefix_length, int calculate_checksum)
285 int64_t start, size, last_size;
286 start= url_ftell(bc) - prefix_length;
288 if(start != nut->packet_start + nut->written_packet_size){
289 av_log(nut->avf, AV_LOG_ERROR, "get_packetheader called at weird position\n");
294 init_checksum(bc, calculate_checksum ? update_adler32 : NULL, 0);
297 last_size= get_v(bc);
298 if(nut->written_packet_size != last_size){
299 av_log(nut->avf, AV_LOG_ERROR, "packet size missmatch %d != %lld at %lld\n", nut->written_packet_size, last_size, start);
304 nut->last_packet_start = nut->packet_start;
305 nut->packet_start = start;
306 nut->written_packet_size= size;
311 static int check_checksum(ByteIOContext *bc){
312 unsigned long checksum= get_checksum(bc);
313 return checksum != get_be32(bc);
319 static int get_length(uint64_t val){
326 return 7; //not reached
329 static uint64_t find_any_startcode(ByteIOContext *bc, int64_t pos){
333 url_fseek(bc, pos, SEEK_SET); //note, this may fail if the stream isnt seekable, but that shouldnt matter, as in this case we simply start where we are currently
335 while(!url_feof(bc)){
336 state= (state<<8) | get_byte(bc);
337 if((state>>56) != 'N')
341 case STREAM_STARTCODE:
342 case KEYFRAME_STARTCODE:
344 case INDEX_STARTCODE:
348 av_log(NULL, AV_LOG_DEBUG, "searched until %lld\n", url_ftell(bc));
352 static int find_startcode(ByteIOContext *bc, uint64_t code, int64_t pos){
354 uint64_t startcode= find_any_startcode(bc, pos);
355 if(startcode == code)
357 else if(startcode == 0)
363 #ifdef CONFIG_ENCODERS
364 static int put_v(ByteIOContext *bc, uint64_t val)
368 val &= 0x7FFFFFFFFFFFFFFFULL; // FIXME can only encode upto 63 bits currently
371 for (i-=7; i>0; i-=7){
372 put_byte(bc, 0x80 | (val>>i));
375 put_byte(bc, val&0x7f);
380 static int put_str(ByteIOContext *bc, const char *string){
381 int len= strlen(string);
384 put_buffer(bc, string, len);
389 static int put_packetheader(NUTContext *nut, ByteIOContext *bc, int max_size, int calculate_checksum)
391 put_flush_packet(bc);
392 nut->last_packet_start= nut->packet_start;
393 nut->packet_start+= nut->written_packet_size;
394 nut->packet_size_pos = url_ftell(bc);
395 nut->written_packet_size = max_size;
397 if(calculate_checksum)
398 init_checksum(bc, update_adler32, 0);
401 put_v(bc, nut->written_packet_size); /* forward ptr */
402 put_v(bc, nut->packet_start - nut->last_packet_start); /* backward ptr */
407 static int update_packetheader(NUTContext *nut, ByteIOContext *bc, int additional_size, int calculate_checksum){
408 int64_t start= nut->packet_start;
409 int64_t cur= url_ftell(bc);
410 int size= cur - start + additional_size;
412 if(calculate_checksum)
415 if(size != nut->written_packet_size){
418 assert( size <= nut->written_packet_size );
420 url_fseek(bc, nut->packet_size_pos, SEEK_SET);
421 for(i=get_length(size); i < get_length(nut->written_packet_size); i+=7)
425 url_fseek(bc, cur, SEEK_SET);
426 nut->written_packet_size= size; //FIXME may fail if multiple updates with differing sizes, as get_length may differ
428 if(calculate_checksum)
429 put_be32(bc, get_checksum(bc));
435 static int nut_write_header(AVFormatContext *s)
437 NUTContext *nut = s->priv_data;
438 ByteIOContext *bc = &s->pb;
439 AVCodecContext *codec;
445 av_mallocz(sizeof(StreamContext)*s->nb_streams);
447 av_set_pts_info(s, 60, 1, AV_TIME_BASE);
450 put_be64(bc, MAIN_STARTCODE);
451 put_packetheader(nut, bc, 120+5*256, 1);
452 put_v(bc, 1); /* version */
453 put_v(bc, s->nb_streams);
457 assert(nut->frame_code['N'].flags == 1);
459 int tmp_flags = nut->frame_code[i].flags;
460 int tmp_stream= nut->frame_code[i].stream_id_plus1;
461 int tmp_mul = nut->frame_code[i].size_mul;
462 int tmp_size = nut->frame_code[i].size_lsb;
463 put_v(bc, tmp_flags);
464 put_v(bc, tmp_stream);
468 for(j=0; i<256; j++,i++){
469 if(nut->frame_code[i].flags != tmp_flags ) break;
470 if(nut->frame_code[i].stream_id_plus1 != tmp_stream) break;
471 if(nut->frame_code[i].size_mul != tmp_mul ) break;
472 if(nut->frame_code[i].size_lsb != tmp_size ) break;
473 if(++tmp_size >= tmp_mul){
481 update_packetheader(nut, bc, 0, 1);
484 for (i = 0; i < s->nb_streams; i++)
488 codec = &s->streams[i]->codec;
490 put_be64(bc, STREAM_STARTCODE);
491 put_packetheader(nut, bc, 120 + codec->extradata_size, 1);
492 put_v(bc, i /*s->streams[i]->index*/);
493 put_v(bc, (codec->codec_type == CODEC_TYPE_AUDIO) ? 32 : 0);
494 if (codec->codec_tag)
495 put_v(bc, codec->codec_tag);
496 else if (codec->codec_type == CODEC_TYPE_VIDEO)
498 put_v(bc, codec_get_bmp_tag(codec->codec_id));
500 else if (codec->codec_type == CODEC_TYPE_AUDIO)
502 put_v(bc, codec_get_wav_tag(codec->codec_id));
507 if (codec->codec_type == CODEC_TYPE_VIDEO)
509 nom = codec->frame_rate;
510 denom = codec->frame_rate_base;
514 nom = codec->sample_rate;
515 if(codec->frame_size>0)
516 denom= codec->frame_size;
520 gcd= ff_gcd(nom, denom);
523 nut->stream[i].rate_num= nom;
524 nut->stream[i].rate_den= denom;
526 put_v(bc, codec->bit_rate);
527 put_v(bc, 0); /* no language code */
530 if(nom / denom < 1000)
531 nut->stream[i].msb_timestamp_shift = 7;
533 nut->stream[i].msb_timestamp_shift = 14;
534 put_v(bc, nut->stream[i].msb_timestamp_shift);
536 put_v(bc, nut->stream[i].initial_pts_predictor[j]);
538 put_v(bc, nut->stream[i].initial_size_predictor[j]);
539 put_byte(bc, 0); /* flags: 0x1 - fixed_fps, 0x2 - index_present */
541 if(codec->extradata_size){
543 put_v(bc, codec->extradata_size);
544 put_buffer(bc, codec->extradata, codec->extradata_size);
546 put_v(bc, 0); /* end of codec specific headers */
548 switch(codec->codec_type)
550 case CODEC_TYPE_AUDIO:
551 put_v(bc, (codec->sample_rate * denom) / nom);
552 put_v(bc, codec->channels);
554 case CODEC_TYPE_VIDEO:
555 put_v(bc, codec->width);
556 put_v(bc, codec->height);
557 put_v(bc, codec->sample_aspect_ratio.num);
558 put_v(bc, codec->sample_aspect_ratio.den);
559 put_v(bc, 0); /* csp type -- unknown */
564 update_packetheader(nut, bc, 0, 1);
568 put_be64(bc, INFO_STARTCODE);
569 put_packetheader(nut, bc, 30+strlen(s->author)+strlen(s->title)+
570 strlen(s->comment)+strlen(s->copyright)+strlen(LIBAVFORMAT_IDENT), 1);
573 put_v(bc, 9); /* type */
574 put_str(bc, s->author);
578 put_v(bc, 10); /* type */
579 put_str(bc, s->title);
583 put_v(bc, 11); /* type */
584 put_str(bc, s->comment);
588 put_v(bc, 12); /* type */
589 put_str(bc, s->copyright);
592 put_v(bc, 13); /* type */
593 put_str(bc, LIBAVFORMAT_IDENT);
595 put_v(bc, 0); /* eof info */
596 update_packetheader(nut, bc, 0, 1);
598 put_flush_packet(bc);
603 static int nut_write_packet(AVFormatContext *s, int stream_index,
604 const uint8_t *buf, int size, int64_t pts)
606 NUTContext *nut = s->priv_data;
607 StreamContext *stream= &nut->stream[stream_index];
608 ByteIOContext *bc = &s->pb;
609 int key_frame = 0, full_pts=0;
611 int64_t lsb_pts, delta_pts;
612 int frame_type, best_length, frame_code, flags, i, size_mul, size_lsb;
613 const int64_t frame_start= url_ftell(bc);
615 if (stream_index > s->nb_streams)
618 pts= (av_rescale(pts, stream->rate_num, stream->rate_den) + AV_TIME_BASE/2) / AV_TIME_BASE;
620 enc = &s->streams[stream_index]->codec;
621 key_frame = enc->coded_frame->key_frame;
622 delta_pts= pts - stream->last_pts;
625 if(frame_start + size + 20 - FFMAX(nut->last_frame_start[1], nut->last_frame_start[2]) > MAX_TYPE1_DISTANCE)
628 if(frame_type==1 && frame_start + size - nut->last_frame_start[2] > MAX_TYPE2_DISTANCE)
630 if(!stream->last_key_frame)
635 update_packetheader(nut, bc, 0, 0);
639 //FIXME ensure that the timestamp can be represented by either delta or lsb or full_pts=1
641 lsb_pts = pts & ((1 << stream->msb_timestamp_shift)-1);
645 for(i=0; i<256; i++){
646 int stream_id_plus1= nut->frame_code[i].stream_id_plus1;
647 int fc_key_frame= stream->last_key_frame;
649 size_mul= nut->frame_code[i].size_mul;
650 size_lsb= nut->frame_code[i].size_lsb;
651 flags= nut->frame_code[i].flags;
653 if(stream_id_plus1 == 0) length+= get_length(stream_index);
654 else if(stream_id_plus1 - 1 != stream_index)
656 if(flags & FLAG_PRED_KEY_FRAME){
657 if(flags & FLAG_KEY_FRAME)
658 fc_key_frame= !fc_key_frame;
660 fc_key_frame= !!(flags & FLAG_KEY_FRAME);
662 assert(key_frame==0 || key_frame==1);
663 if(fc_key_frame != key_frame)
666 if((!!(flags & FLAG_FRAME_TYPE)) != (frame_type > 0))
669 if(size_mul <= size_lsb){
670 int p= stream->lru_size[size_lsb - size_mul];
674 if(size % size_mul != size_lsb)
676 if(flags & FLAG_DATA_SIZE)
677 length += get_length(size / size_mul);
678 else if(size/size_mul)
682 if(full_pts != ((flags & FLAG_PTS) && (flags & FLAG_FULL_PTS)))
686 if(flags&FLAG_FULL_PTS){
687 length += get_length(pts);
689 length += get_length(lsb_pts);
692 int delta= stream->lru_pts_delta[(flags & 12)>>2];
693 if(delta != pts - stream->last_pts)
695 assert(frame_type == 0);
698 if(length < best_length){
702 // 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);
705 assert(frame_code != -1);
706 flags= nut->frame_code[frame_code].flags;
707 size_mul= nut->frame_code[frame_code].size_mul;
708 size_lsb= nut->frame_code[frame_code].size_lsb;
711 best_length ++; //frame_code
713 best_length += 4; //packet header
715 best_length += 8; // startcode
717 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));
721 put_be64(bc, KEYFRAME_STARTCODE);
722 put_byte(bc, frame_code);
725 put_packetheader(nut, bc, FFMAX(size+20, MAX_TYPE1_DISTANCE), 0);
726 if(nut->frame_code[frame_code].stream_id_plus1 == 0)
727 put_v(bc, stream_index);
728 if (flags & FLAG_PTS){
729 if (flags & FLAG_FULL_PTS)
734 if(flags & FLAG_DATA_SIZE)
735 put_v(bc, size / size_mul);
736 if(size > MAX_TYPE1_DISTANCE){
737 assert(frame_type > 0);
738 update_packetheader(nut, bc, size, 0);
741 put_buffer(bc, buf, size);
743 update(nut, stream_index, frame_start, frame_type, frame_code, key_frame, size, pts);
748 static int nut_write_trailer(AVFormatContext *s)
750 NUTContext *nut = s->priv_data;
751 ByteIOContext *bc = &s->pb;
753 update_packetheader(nut, bc, 0, 0);
760 for (i = 0; s->nb_streams; i++)
762 put_be64(bc, INDEX_STARTCODE);
763 put_packetheader(nut, bc, 64, 1);
764 put_v(bc, s->streams[i]->id);
766 update_packetheader(nut, bc, 0, 1);
770 put_flush_packet(bc);
772 av_freep(&nut->stream);
776 #endif //CONFIG_ENCODERS
778 static int nut_probe(AVProbeData *p)
784 for (i = 0; i < p->buf_size; i++) {
786 code = (code << 8) | c;
787 if (code == MAIN_STARTCODE)
788 return AVPROBE_SCORE_MAX;
793 static int decode_main_header(NUTContext *nut){
794 AVFormatContext *s= nut->avf;
795 ByteIOContext *bc = &s->pb;
799 get_packetheader(nut, bc, 8, 1);
803 av_log(s, AV_LOG_ERROR, "bad version (%Ld)\n", tmp);
807 nut->stream_count = get_v(bc);
808 get_v(bc); //checksum threshold
811 int tmp_flags = get_v(bc);
812 int tmp_stream= get_v(bc);
813 int tmp_mul = get_v(bc);
814 int tmp_size = get_v(bc);
815 int count = get_v(bc);
817 if(count == 0 || i+count > 256){
818 av_log(s, AV_LOG_ERROR, "illegal count %d at %d\n", count, i);
822 if((tmp_flags & FLAG_FRAME_TYPE) && tmp_flags != 1){
823 if(tmp_flags & FLAG_PRED_KEY_FRAME){
824 av_log(s, AV_LOG_ERROR, "keyframe prediction in non 0 frame type\n");
827 if(!(tmp_flags & FLAG_PTS) || !(tmp_flags & FLAG_FULL_PTS) ){
828 av_log(s, AV_LOG_ERROR, "no full pts in non 0 frame type\n");
833 for(j=0; j<count; j++,i++){
834 if(tmp_stream > nut->stream_count + 1){
835 av_log(s, AV_LOG_ERROR, "illegal stream number\n");
839 nut->frame_code[i].flags = tmp_flags ;
840 nut->frame_code[i].stream_id_plus1 = tmp_stream;
841 nut->frame_code[i].size_mul = tmp_mul ;
842 nut->frame_code[i].size_lsb = tmp_size ;
843 if(++tmp_size >= tmp_mul){
849 if(nut->frame_code['N'].flags != 1){
850 av_log(s, AV_LOG_ERROR, "illegal frame_code table\n");
854 if(check_checksum(bc)){
855 av_log(s, AV_LOG_ERROR, "Main header checksum missmatch\n");
862 static int decode_stream_header(NUTContext *nut){
863 AVFormatContext *s= nut->avf;
864 ByteIOContext *bc = &s->pb;
865 int class, nom, denom, stream_id, i;
869 get_packetheader(nut, bc, 8, 1);
870 stream_id= get_v(bc);
871 if(stream_id >= nut->stream_count || s->streams[stream_id])
874 st = av_new_stream(s, stream_id);
876 return AVERROR_NOMEM;
882 st->codec.codec_type = CODEC_TYPE_VIDEO;
883 st->codec.codec_id = codec_get_bmp_id(tmp);
884 if (st->codec.codec_id == CODEC_ID_NONE)
885 av_log(s, AV_LOG_ERROR, "Unknown codec?!\n");
888 st->codec.codec_type = CODEC_TYPE_AUDIO;
889 st->codec.codec_id = codec_get_wav_id(tmp);
890 if (st->codec.codec_id == CODEC_ID_NONE)
891 av_log(s, AV_LOG_ERROR, "Unknown codec?!\n");
894 av_log(s, AV_LOG_ERROR, "Unknown stream class (%d)\n", class);
897 s->bit_rate += get_v(bc);
898 get_v(bc); /* language code */
901 nut->stream[stream_id].msb_timestamp_shift = get_v(bc);
903 nut->stream[stream_id].initial_pts_predictor[i]= get_v(bc);
905 nut->stream[stream_id].initial_size_predictor[i]= get_v(bc);
906 get_byte(bc); /* flags */
908 /* codec specific data headers */
909 while(get_v(bc) != 0){
910 st->codec.extradata_size= get_v(bc);
911 st->codec.extradata= av_mallocz(st->codec.extradata_size);
912 get_buffer(bc, st->codec.extradata, st->codec.extradata_size);
913 // url_fskip(bc, get_v(bc));
916 if (class == 0) /* VIDEO */
918 st->codec.width = get_v(bc);
919 st->codec.height = get_v(bc);
920 st->codec.sample_aspect_ratio.num= get_v(bc);
921 st->codec.sample_aspect_ratio.den= get_v(bc);
922 get_v(bc); /* csp type */
924 st->codec.frame_rate = nom;
925 st->codec.frame_rate_base = denom;
927 if (class == 32) /* AUDIO */
929 st->codec.sample_rate = (get_v(bc) * nom) / denom;
930 st->codec.channels = get_v(bc);
932 if(check_checksum(bc)){
933 av_log(s, AV_LOG_ERROR, "Stream header %d checksum missmatch\n", stream_id);
936 nut->stream[stream_id].rate_num= nom;
937 nut->stream[stream_id].rate_den= denom;
941 static int decode_info_header(NUTContext *nut){
942 AVFormatContext *s= nut->avf;
943 ByteIOContext *bc = &s->pb;
945 get_packetheader(nut, bc, 8, 1);
949 char *name, *type, custom_name[256], custom_type[256];
953 else if(id >= sizeof(info_table)/sizeof(info_table[0])){
954 av_log(s, AV_LOG_ERROR, "info id is too large %d %d\n", id, sizeof(info_table)/sizeof(info_table[0]));
958 type= info_table[id][1];
959 name= info_table[id][0];
960 //av_log(s, AV_LOG_DEBUG, "%d %s %s\n", id, type, name);
963 get_str(bc, custom_type, sizeof(custom_type));
967 get_str(bc, custom_name, sizeof(custom_name));
971 if(!strcmp(type, "v")){
972 int value= get_v(bc);
974 if(!strcmp(name, "Author"))
975 get_str(bc, s->author, sizeof(s->author));
976 else if(!strcmp(name, "Title"))
977 get_str(bc, s->title, sizeof(s->title));
978 else if(!strcmp(name, "Copyright"))
979 get_str(bc, s->copyright, sizeof(s->copyright));
980 else if(!strcmp(name, "Description"))
981 get_str(bc, s->comment, sizeof(s->comment));
983 get_str(bc, NULL, 0);
986 if(check_checksum(bc)){
987 av_log(s, AV_LOG_ERROR, "Info header checksum missmatch\n");
993 static int nut_read_header(AVFormatContext *s, AVFormatParameters *ap)
995 NUTContext *nut = s->priv_data;
996 ByteIOContext *bc = &s->pb;
998 int inited_stream_count;
1002 av_set_pts_info(s, 60, 1, AV_TIME_BASE);
1007 if (find_startcode(bc, MAIN_STARTCODE, pos)<0){
1008 av_log(s, AV_LOG_ERROR, "no main startcode found\n");
1012 if(decode_main_header(nut) >= 0)
1019 nut->stream = av_malloc(sizeof(StreamContext)*nut->stream_count);
1021 /* stream headers */
1023 for(inited_stream_count=0; inited_stream_count < nut->stream_count;){
1024 if (find_startcode(bc, STREAM_STARTCODE, pos)<0){
1025 av_log(s, AV_LOG_ERROR, "not all stream headers found\n");
1029 if(decode_stream_header(nut) >= 0)
1030 inited_stream_count++;
1036 uint64_t startcode= find_any_startcode(bc, pos);
1040 av_log(s, AV_LOG_ERROR, "EOF before video frames\n");
1042 }else if(startcode == KEYFRAME_STARTCODE){
1043 nut->next_startcode= startcode;
1045 }else if(startcode != INFO_STARTCODE){
1049 decode_info_header(nut);
1055 static int decode_frame(NUTContext *nut, AVPacket *pkt, int frame_code, int frame_type){
1056 AVFormatContext *s= nut->avf;
1057 StreamContext *stream;
1058 ByteIOContext *bc = &s->pb;
1059 int size, flags, size_mul, size_lsb, stream_id;
1062 const int prefix_len= frame_type == 2 ? 8+1 : 1;
1063 const int64_t frame_start= url_ftell(bc) + prefix_len;
1065 flags= nut->frame_code[frame_code].flags;
1066 size_mul= nut->frame_code[frame_code].size_mul;
1067 size_lsb= nut->frame_code[frame_code].size_lsb;
1068 stream_id= nut->frame_code[frame_code].stream_id_plus1 - 1;
1070 if(flags & FLAG_FRAME_TYPE){
1072 if(get_packetheader(nut, bc, prefix_len, 0) < 0)
1079 stream_id= get_v(bc);
1080 if(stream_id >= s->nb_streams){
1081 av_log(s, AV_LOG_ERROR, "illegal stream_id\n");
1084 stream= &nut->stream[stream_id];
1086 // av_log(s, AV_LOG_DEBUG, "ft:%d ppts:%d %d %d\n", frame_type, stream->lru_pts_delta[0], stream->lru_pts_delta[1], stream->lru_pts_delta[2]);
1088 if(flags & FLAG_PRED_KEY_FRAME){
1089 if(flags & FLAG_KEY_FRAME)
1090 key_frame= !stream->last_key_frame;
1092 key_frame= stream->last_key_frame;
1094 key_frame= !!(flags & FLAG_KEY_FRAME);
1097 if(flags & FLAG_PTS){
1098 if(flags & FLAG_FULL_PTS){
1101 int64_t mask = (1<<stream->msb_timestamp_shift)-1;
1102 int64_t delta= stream->last_pts - mask/2;
1103 pts= ((get_v(bc) - delta)&mask) + delta;
1106 pts= stream->last_pts + stream->lru_pts_delta[(flags&12)>>2];
1109 if(size_mul <= size_lsb){
1110 size= stream->lru_size[size_lsb - size_mul];
1112 if(flags & FLAG_DATA_SIZE)
1113 size= size_mul*get_v(bc) + size_lsb;
1118 //av_log(s, AV_LOG_DEBUG, "fs:%lld fc:%d ft:%d kf:%d pts:%lld size:%d\n", frame_start, frame_code, frame_type, key_frame, pts, size);
1120 if(url_ftell(bc) - nut->packet_start + size > nut->written_packet_size){
1121 av_log(s, AV_LOG_ERROR, "frame size too large\n");
1125 av_new_packet(pkt, size);
1126 get_buffer(bc, pkt->data, size);
1127 pkt->stream_index = stream_id;
1129 pkt->flags |= PKT_FLAG_KEY;
1130 pkt->pts = pts * AV_TIME_BASE * stream->rate_den / stream->rate_num;
1132 update(nut, stream_id, frame_start, frame_type, frame_code, key_frame, size, pts);
1137 static int nut_read_packet(AVFormatContext *s, AVPacket *pkt)
1139 NUTContext *nut = s->priv_data;
1140 ByteIOContext *bc = &s->pb;
1141 int size, frame_code=0;
1146 uint64_t tmp= nut->next_startcode;
1147 nut->next_startcode=0;
1153 frame_code = get_byte(bc);
1154 if(frame_code == 'N'){
1156 tmp<<=8 ; tmp |= get_byte(bc);
1157 tmp<<=16; tmp |= get_be16(bc);
1158 tmp<<=32; tmp |= get_be32(bc);
1162 case KEYFRAME_STARTCODE:
1165 case MAIN_STARTCODE:
1166 case STREAM_STARTCODE:
1167 case INDEX_STARTCODE:
1168 get_packetheader(nut, bc, 8, 0);
1169 url_fseek(bc, nut->written_packet_size + nut->packet_start, SEEK_SET);
1171 case INFO_STARTCODE:
1172 if(decode_info_header(nut)<0)
1176 if(decode_frame(nut, pkt, frame_code, frame_type)>=0)
1181 av_log(s, AV_LOG_DEBUG, "syncing from %lld\n", nut->packet_start+1);
1182 tmp= find_any_startcode(bc, nut->packet_start+1);
1185 av_log(s, AV_LOG_DEBUG, "sync\n");
1186 if(url_is_streamed(bc)){
1187 nut->next_startcode= tmp;
1191 pos= url_ftell(bc) - 8;
1192 av_log(s, AV_LOG_DEBUG, "at %lld code=%llX\n", pos, tmp);
1193 if(tmp==KEYFRAME_STARTCODE){
1199 while(size > 2 && size < 100000 && nut->packet_start < pos - size){
1200 url_fseek(bc, pos - size, SEEK_SET);
1201 frame_code= get_byte(bc);
1202 if(!(nut->frame_code[ frame_code ].flags & FLAG_FRAME_TYPE))
1204 if(get_v(bc) != size)
1208 av_log(s, AV_LOG_DEBUG, "steping back to %lld next %d\n", pos, size);
1210 url_fseek(bc, pos, SEEK_SET);
1212 nut->written_packet_size= size;
1213 nut->packet_start= pos - size;
1218 static int nut_read_close(AVFormatContext *s)
1220 NUTContext *nut = s->priv_data;
1223 for(i=0;i<s->nb_streams;i++) {
1224 av_freep(&s->streams[i]->codec.extradata);
1226 av_freep(&nut->stream);
1231 static AVInputFormat nut_iformat = {
1240 .extensions = "nut",
1243 #ifdef CONFIG_ENCODERS
1244 static AVOutputFormat nut_oformat = {
1250 #ifdef CONFIG_VORBIS
1252 #elif defined(CONFIG_MP3LAME)
1255 CODEC_ID_MP2, /* AC3 needs liba52 decoder */
1262 #endif //CONFIG_ENCODERS
1266 av_register_input_format(&nut_iformat);
1267 #ifdef CONFIG_ENCODERS
1268 av_register_output_format(&nut_oformat);
1269 #endif //CONFIG_ENCODERS