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, ..)
29 * - index packet reading support
36 #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_DISTANCE (1024*16-1)
53 #define MAX_SHORT_DISTANCE (1024*4-1)
55 #define FLAG_DATA_SIZE 1
56 #define FLAG_KEY_FRAME 2
57 #define FLAG_INVALID 4
61 uint8_t stream_id_plus1;
64 int16_t timestamp_delta;
65 uint8_t reserved_count;
70 int msb_timestamp_shift;
74 int64_t last_sync_pos; ///<pos of last 1/2 type frame
80 int written_packet_size;
81 int64_t packet_start[3]; //0-> startcode less, 1-> short startcode 2-> long startcodes
82 FrameCode frame_code[256];
84 uint64_t next_startcode; ///< stores the next startcode if it has alraedy been parsed but the stream isnt seekable
85 StreamContext *stream;
92 static char *info_table[][2]={
93 {NULL , NULL }, // end
100 {"StartTimestamp" , "v"},
101 {"EndTimestamp" , "v"},
104 {"Description" , "UTF8"},
105 {"Copyright" , "UTF8"},
106 {"Encoder" , "UTF8"},
107 {"Keyword" , "UTF8"},
112 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){
113 StreamContext *stream= &nut->stream[stream_index];
115 stream->last_key_frame= key_frame;
116 nut->packet_start[ frame_type ]= frame_start;
117 stream->last_pts= pts;
120 static void reset(AVFormatContext *s, int64_t global_ts){
121 NUTContext *nut = s->priv_data;
124 for(i=0; i<s->nb_streams; i++){
125 StreamContext *stream= &nut->stream[i];
127 stream->last_key_frame= 1;
129 stream->last_pts= av_rescale(global_ts, stream->rate_num*(int64_t)nut->rate_den, stream->rate_den*(int64_t)nut->rate_num);
133 static void build_frame_code(AVFormatContext *s){
134 NUTContext *nut = s->priv_data;
135 int key_frame, index, pred, stream_id;
138 int keyframe_0_esc= s->nb_streams > 2;
142 /* keyframe = 0 escape */
143 FrameCode *ft= &nut->frame_code[start];
144 ft->flags= FLAG_DATA_SIZE;
145 ft->stream_id_plus1= 0;
147 ft->timestamp_delta=0;
151 for(stream_id= 0; stream_id<s->nb_streams; stream_id++){
152 int start2= start + (end-start)*stream_id / s->nb_streams;
153 int end2 = start + (end-start)*(stream_id+1) / s->nb_streams;
154 AVCodecContext *codec = &s->streams[stream_id]->codec;
155 int is_audio= codec->codec_type == CODEC_TYPE_AUDIO;
156 int intra_only= /*codec->intra_only || */is_audio;
159 for(key_frame=0; key_frame<2; key_frame++){
160 if(intra_only && keyframe_0_esc && key_frame==0)
164 FrameCode *ft= &nut->frame_code[start2];
165 ft->flags= FLAG_KEY_FRAME*key_frame;
166 ft->flags|= FLAG_DATA_SIZE;
167 ft->stream_id_plus1= stream_id + 1;
169 ft->timestamp_delta=0;
174 key_frame= intra_only;
177 int frame_bytes= codec->frame_size*(int64_t)codec->bit_rate / (8*codec->sample_rate);
179 for(pts=0; pts<2; pts++){
180 for(pred=0; pred<2; pred++){
181 FrameCode *ft= &nut->frame_code[start2];
182 ft->flags= FLAG_KEY_FRAME*key_frame;
183 ft->stream_id_plus1= stream_id + 1;
184 ft->size_mul=frame_bytes + 2;
185 ft->size_lsb=frame_bytes + pred;
186 ft->timestamp_delta=pts;
191 FrameCode *ft= &nut->frame_code[start2];
192 ft->flags= FLAG_KEY_FRAME | FLAG_DATA_SIZE;
193 ft->stream_id_plus1= stream_id + 1;
195 ft->timestamp_delta=1;
200 if(codec->has_b_frames){
207 }else if(codec->codec_id == CODEC_ID_VORBIS){
217 for(pred=0; pred<pred_count; pred++){
218 int start3= start2 + (end2-start2)*pred / pred_count;
219 int end3 = start2 + (end2-start2)*(pred+1) / pred_count;
221 for(index=start3; index<end3; index++){
222 FrameCode *ft= &nut->frame_code[index];
223 ft->flags= FLAG_KEY_FRAME*key_frame;
224 ft->flags|= FLAG_DATA_SIZE;
225 ft->stream_id_plus1= stream_id + 1;
226 //FIXME use single byte size and pred from last
227 ft->size_mul= end3-start3;
228 ft->size_lsb= index - start3;
229 ft->timestamp_delta= pred_table[pred];
233 memmove(&nut->frame_code['N'+1], &nut->frame_code['N'], sizeof(FrameCode)*(255-'N'));
234 nut->frame_code['N'].flags= FLAG_INVALID;
237 static uint64_t get_v(ByteIOContext *bc)
243 int tmp = get_byte(bc);
246 val= (val<<7) + tmp - 0x80;
248 //av_log(NULL, AV_LOG_DEBUG, "get_v()= %lld\n", (val<<7) + tmp);
249 return (val<<7) + tmp;
255 static int get_str(ByteIOContext *bc, char *string, int maxlen){
259 get_buffer(bc, string, FFMIN(len, maxlen));
266 string[FFMIN(len, maxlen-1)]= 0;
274 static int64_t get_s(ByteIOContext *bc){
275 int64_t v = get_v(bc) + 1;
277 if (v&1) return -(v>>1);
281 static uint64_t get_vb(ByteIOContext *bc){
289 val = (val<<8) + get_byte(bc);
291 //av_log(NULL, AV_LOG_DEBUG, "get_vb()= %lld\n", val);
296 static inline uint64_t get_v_trace(ByteIOContext *bc, char *file, char *func, int line){
297 uint64_t v= get_v(bc);
299 printf("get_v %5lld / %llX in %s %s:%d\n", v, v, file, func, line);
303 static inline int64_t get_s_trace(ByteIOContext *bc, char *file, char *func, int line){
304 int64_t v= get_s(bc);
306 printf("get_s %5lld / %llX in %s %s:%d\n", v, v, file, func, line);
310 static inline uint64_t get_vb_trace(ByteIOContext *bc, char *file, char *func, int line){
311 uint64_t v= get_vb(bc);
313 printf("get_vb %5lld / %llX in %s %s:%d\n", v, v, file, func, line);
316 #define get_v(bc) get_v_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__)
317 #define get_s(bc) get_s_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__)
318 #define get_vb(bc) get_vb_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__)
322 static int get_packetheader(NUTContext *nut, ByteIOContext *bc, int calculate_checksum)
325 start= url_ftell(bc) - 8;
327 init_checksum(bc, calculate_checksum ? update_adler32 : NULL, 0);
331 nut->packet_start[2] = start;
332 nut->written_packet_size= size;
337 static int check_checksum(ByteIOContext *bc){
338 unsigned long checksum= get_checksum(bc);
339 return checksum != get_be32(bc);
345 static int get_length(uint64_t val){
348 for (i=7; val>>i; i+=7);
353 static uint64_t find_any_startcode(ByteIOContext *bc, int64_t pos){
357 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
359 while(!url_feof(bc)){
360 state= (state<<8) | get_byte(bc);
361 if((state>>56) != 'N')
365 case STREAM_STARTCODE:
366 case KEYFRAME_STARTCODE:
368 case INDEX_STARTCODE:
377 * find the given startcode.
378 * @param code the startcode
379 * @param pos the start position of the search, or -1 if the current position
380 * @returns the position of the startcode or -1 if not found
382 static int64_t find_startcode(ByteIOContext *bc, uint64_t code, int64_t pos){
384 uint64_t startcode= find_any_startcode(bc, pos);
385 if(startcode == code)
386 return url_ftell(bc) - 8;
387 else if(startcode == 0)
393 #ifdef CONFIG_ENCODERS
395 static void put_v(ByteIOContext *bc, uint64_t val)
399 //av_log(NULL, AV_LOG_DEBUG, "put_v()= %lld\n", val);
400 val &= 0x7FFFFFFFFFFFFFFFULL; // FIXME can only encode upto 63 bits currently
403 for (i-=7; i>0; i-=7){
404 put_byte(bc, 0x80 | (val>>i));
407 put_byte(bc, val&0x7f);
411 * stores a string as vb.
413 static void put_str(ByteIOContext *bc, const char *string){
414 int len= strlen(string);
417 put_buffer(bc, string, len);
420 static void put_s(ByteIOContext *bc, uint64_t val){
421 if (val<=0) put_v(bc, -2*val );
422 else put_v(bc, 2*val-1);
425 static void put_vb(ByteIOContext *bc, uint64_t val){
428 for (i=8; val>>i; i+=8);
431 for(i-=8; i>=0; i-=8)
432 put_byte(bc, (val>>i)&0xFF);
436 static inline void put_v_trace(ByteIOContext *bc, uint64_t v, char *file, char *func, int line){
437 printf("get_v %5lld / %llX in %s %s:%d\n", v, v, file, func, line);
442 static inline void put_s_trace(ByteIOContext *bc, int64_t v, char *file, char *func, int line){
443 printf("get_s %5lld / %llX in %s %s:%d\n", v, v, file, func, line);
448 static inline void put_vb_trace(ByteIOContext *bc, uint64_t v, char *file, char *func, int line){
449 printf("get_vb %5lld / %llX in %s %s:%d\n", v, v, file, func, line);
453 #define put_v(bc, v) put_v_trace(bc, v, __FILE__, __PRETTY_FUNCTION__, __LINE__)
454 #define put_s(bc, v) put_s_trace(bc, v, __FILE__, __PRETTY_FUNCTION__, __LINE__)
455 #define put_vb(bc, v) put_vb_trace(bc, v, __FILE__, __PRETTY_FUNCTION__, __LINE__)
458 static int put_packetheader(NUTContext *nut, ByteIOContext *bc, int max_size, int calculate_checksum)
460 put_flush_packet(bc);
461 nut->packet_start[2]+= nut->written_packet_size;
462 assert(url_ftell(bc) - 8 == nut->packet_start[2]);
463 nut->written_packet_size = max_size;
465 if(calculate_checksum)
466 init_checksum(bc, update_adler32, 0);
469 put_v(bc, nut->written_packet_size); /* forward ptr */
474 static int update_packetheader(NUTContext *nut, ByteIOContext *bc, int additional_size, int calculate_checksum){
475 int64_t start= nut->packet_start[2];
476 int64_t cur= url_ftell(bc);
477 int size= cur - start + additional_size;
479 if(calculate_checksum)
482 if(size != nut->written_packet_size){
485 assert( size <= nut->written_packet_size );
487 url_fseek(bc, start + 8, SEEK_SET);
488 for(i=get_length(size); i < get_length(nut->written_packet_size); i+=7)
492 url_fseek(bc, cur, SEEK_SET);
493 nut->written_packet_size= size; //FIXME may fail if multiple updates with differing sizes, as get_length may differ
495 if(calculate_checksum)
496 put_be32(bc, get_checksum(bc));
502 static int nut_write_header(AVFormatContext *s)
504 NUTContext *nut = s->priv_data;
505 ByteIOContext *bc = &s->pb;
506 AVCodecContext *codec;
507 int i, j, tmp_time, tmp_flags,tmp_stream, tmp_mul, tmp_size, tmp_fields;
512 av_mallocz(sizeof(StreamContext)*s->nb_streams);
514 av_set_pts_info(s, 60, 1, AV_TIME_BASE);
517 put_be64(bc, MAIN_STARTCODE);
518 put_packetheader(nut, bc, 120+5*256, 1);
519 put_v(bc, 2); /* version */
520 put_v(bc, s->nb_streams);
521 put_v(bc, MAX_DISTANCE);
523 put_v(bc, nut->rate_num=1);
524 put_v(bc, nut->rate_den=2);
525 put_v(bc, nut->short_startcode=0x4EFE79);
528 assert(nut->frame_code['N'].flags == FLAG_INVALID);
530 tmp_time= tmp_flags= tmp_stream= tmp_mul= tmp_size= /*tmp_res=*/ INT_MAX;
534 if(tmp_time != nut->frame_code[i].timestamp_delta) tmp_fields=1;
535 if(tmp_mul != nut->frame_code[i].size_mul ) tmp_fields=2;
536 if(tmp_stream != nut->frame_code[i].stream_id_plus1) tmp_fields=3;
537 if(tmp_size != nut->frame_code[i].size_lsb ) tmp_fields=4;
538 // if(tmp_res != nut->frame_code[i].res ) tmp_fields=5;
540 tmp_time = nut->frame_code[i].timestamp_delta;
541 tmp_flags = nut->frame_code[i].flags;
542 tmp_stream= nut->frame_code[i].stream_id_plus1;
543 tmp_mul = nut->frame_code[i].size_mul;
544 tmp_size = nut->frame_code[i].size_lsb;
545 // tmp_res = nut->frame_code[i].res;
547 for(j=0; i<256; j++,i++){
548 if(nut->frame_code[i].timestamp_delta != tmp_time ) break;
549 if(nut->frame_code[i].flags != tmp_flags ) break;
550 if(nut->frame_code[i].stream_id_plus1 != tmp_stream) break;
551 if(nut->frame_code[i].size_mul != tmp_mul ) break;
552 if(nut->frame_code[i].size_lsb != tmp_size+j) break;
553 // if(nut->frame_code[i].res != tmp_res ) break;
555 if(j != tmp_mul - tmp_size) tmp_fields=6;
557 put_v(bc, tmp_flags);
558 put_v(bc, tmp_fields);
559 if(tmp_fields>0) put_s(bc, tmp_time);
560 if(tmp_fields>1) put_v(bc, tmp_mul);
561 if(tmp_fields>2) put_v(bc, tmp_stream);
562 if(tmp_fields>3) put_v(bc, tmp_size);
563 if(tmp_fields>4) put_v(bc, 0 /*tmp_res*/);
564 if(tmp_fields>5) put_v(bc, j);
567 update_packetheader(nut, bc, 0, 1);
570 for (i = 0; i < s->nb_streams; i++)
574 codec = &s->streams[i]->codec;
576 put_be64(bc, STREAM_STARTCODE);
577 put_packetheader(nut, bc, 120 + codec->extradata_size, 1);
578 put_v(bc, i /*s->streams[i]->index*/);
579 put_v(bc, (codec->codec_type == CODEC_TYPE_AUDIO) ? 32 : 0);
580 if (codec->codec_tag)
581 put_vb(bc, codec->codec_tag);
582 else if (codec->codec_type == CODEC_TYPE_VIDEO)
584 put_vb(bc, codec_get_bmp_tag(codec->codec_id));
586 else if (codec->codec_type == CODEC_TYPE_AUDIO)
588 put_vb(bc, codec_get_wav_tag(codec->codec_id));
593 if (codec->codec_type == CODEC_TYPE_VIDEO)
595 nom = codec->frame_rate;
596 denom = codec->frame_rate_base;
600 nom = codec->sample_rate;
601 if(codec->frame_size>0)
602 denom= codec->frame_size;
606 gcd= ff_gcd(nom, denom);
609 nut->stream[i].rate_num= nom;
610 nut->stream[i].rate_den= denom;
612 put_v(bc, codec->bit_rate);
613 put_vb(bc, 0); /* no language code */
616 if(nom / denom < 1000)
617 nut->stream[i].msb_timestamp_shift = 7;
619 nut->stream[i].msb_timestamp_shift = 14;
620 put_v(bc, nut->stream[i].msb_timestamp_shift);
621 put_v(bc, codec->has_b_frames);
622 put_byte(bc, 0); /* flags: 0x1 - fixed_fps, 0x2 - index_present */
624 if(codec->extradata_size){
626 put_v(bc, codec->extradata_size);
627 put_buffer(bc, codec->extradata, codec->extradata_size);
629 put_v(bc, 0); /* end of codec specific headers */
631 switch(codec->codec_type)
633 case CODEC_TYPE_AUDIO:
634 put_v(bc, codec->sample_rate);
636 put_v(bc, codec->channels);
638 case CODEC_TYPE_VIDEO:
639 put_v(bc, codec->width);
640 put_v(bc, codec->height);
641 put_v(bc, codec->sample_aspect_ratio.num);
642 put_v(bc, codec->sample_aspect_ratio.den);
643 put_v(bc, 0); /* csp type -- unknown */
648 update_packetheader(nut, bc, 0, 1);
652 put_be64(bc, INFO_STARTCODE);
653 put_packetheader(nut, bc, 30+strlen(s->author)+strlen(s->title)+
654 strlen(s->comment)+strlen(s->copyright)+strlen(LIBAVFORMAT_IDENT), 1);
657 put_v(bc, 9); /* type */
658 put_str(bc, s->author);
662 put_v(bc, 10); /* type */
663 put_str(bc, s->title);
667 put_v(bc, 11); /* type */
668 put_str(bc, s->comment);
672 put_v(bc, 12); /* type */
673 put_str(bc, s->copyright);
676 if(!(s->streams[0]->codec.flags & CODEC_FLAG_BITEXACT)){
677 put_v(bc, 13); /* type */
678 put_str(bc, LIBAVFORMAT_IDENT);
681 put_v(bc, 0); /* eof info */
682 update_packetheader(nut, bc, 0, 1);
684 put_flush_packet(bc);
689 static int64_t lsb2full(StreamContext *stream, int64_t lsb){
690 int64_t mask = (1<<stream->msb_timestamp_shift)-1;
691 int64_t delta= stream->last_pts - mask/2;
692 return ((lsb - delta)&mask) + delta;
695 static int nut_write_packet(AVFormatContext *s, int stream_index,
696 const uint8_t *buf, int size, int64_t pts)
698 NUTContext *nut = s->priv_data;
699 StreamContext *stream= &nut->stream[stream_index];
700 ByteIOContext *bc = &s->pb;
701 int key_frame = 0, full_pts=0;
704 int frame_type, best_length, frame_code, flags, i, size_mul, size_lsb, time_delta;
705 const int64_t frame_start= url_ftell(bc);
707 if (stream_index > s->nb_streams)
710 pts= av_rescale(pts, stream->rate_num, stream->rate_den*(int64_t)AV_TIME_BASE);
712 enc = &s->streams[stream_index]->codec;
713 key_frame = enc->coded_frame->key_frame;
714 if(enc->coded_frame->pts != AV_NOPTS_VALUE)
715 pts= av_rescale(enc->coded_frame->pts, stream->rate_num, stream->rate_den*(int64_t)AV_TIME_BASE); //FIXME XXX HACK
718 if(frame_start + size + 20 - FFMAX(nut->packet_start[1], nut->packet_start[2]) > MAX_DISTANCE)
720 if(key_frame && !stream->last_key_frame)
724 int64_t global_ts= av_rescale(pts, stream->rate_den*(int64_t)nut->rate_num, stream->rate_num*(int64_t)nut->rate_den);
726 put_be64(bc, KEYFRAME_STARTCODE);
727 put_v(bc, global_ts);
729 assert(stream->last_pts != AV_NOPTS_VALUE);
730 coded_pts = pts & ((1<<stream->msb_timestamp_shift)-1);
731 if(lsb2full(stream, coded_pts) != pts)
735 coded_pts= pts + (1<<stream->msb_timestamp_shift);
739 for(i=0; i<256; i++){
740 int stream_id_plus1= nut->frame_code[i].stream_id_plus1;
743 size_mul= nut->frame_code[i].size_mul;
744 size_lsb= nut->frame_code[i].size_lsb;
745 time_delta= nut->frame_code[i].timestamp_delta;
746 flags= nut->frame_code[i].flags;
748 assert(size_mul > size_lsb);
750 if(stream_id_plus1 == 0) length+= get_length(stream_index);
751 else if(stream_id_plus1 - 1 != stream_index)
753 fc_key_frame= !!(flags & FLAG_KEY_FRAME);
755 assert(key_frame==0 || key_frame==1);
756 if(fc_key_frame != key_frame)
759 if(flags & FLAG_DATA_SIZE){
760 if(size % size_mul != size_lsb)
762 length += get_length(size / size_mul);
763 }else if(size != size_lsb)
766 if(full_pts && time_delta)
770 length += get_length(coded_pts);
772 if(time_delta != pts - stream->last_pts)
776 if(length < best_length){
780 // 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);
783 assert(frame_code != -1);
784 flags= nut->frame_code[frame_code].flags;
785 size_mul= nut->frame_code[frame_code].size_mul;
786 size_lsb= nut->frame_code[frame_code].size_lsb;
787 time_delta= nut->frame_code[frame_code].timestamp_delta;
790 best_length ++; //frame_code
792 best_length += 8; // startcode
794 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 pts:%lld fs:%lld\n", key_frame, frame_type, full_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), pts, frame_start);
795 // av_log(s, AV_LOG_DEBUG, "%d %d %d\n", stream->lru_pts_delta[0], stream->lru_pts_delta[1], stream->lru_pts_delta[2]);
798 assert(frame_type != 1); //short startcode not implemented yet
799 put_byte(bc, frame_code);
801 if(nut->frame_code[frame_code].stream_id_plus1 == 0)
802 put_v(bc, stream_index);
804 put_v(bc, coded_pts);
806 if(flags & FLAG_DATA_SIZE)
807 put_v(bc, size / size_mul);
809 assert(size == size_lsb);
810 if(size > MAX_DISTANCE){
811 assert(frame_type > 1);
814 put_buffer(bc, buf, size);
816 update(nut, stream_index, frame_start, frame_type, frame_code, key_frame, size, pts);
821 static int nut_write_trailer(AVFormatContext *s)
823 NUTContext *nut = s->priv_data;
824 ByteIOContext *bc = &s->pb;
831 for (i = 0; s->nb_streams; i++)
833 put_be64(bc, INDEX_STARTCODE);
834 put_packetheader(nut, bc, 64, 1);
835 put_v(bc, s->streams[i]->id);
837 update_packetheader(nut, bc, 0, 1);
841 put_flush_packet(bc);
843 av_freep(&nut->stream);
847 #endif //CONFIG_ENCODERS
849 static int nut_probe(AVProbeData *p)
854 for (i = 0; i < p->buf_size; i++) {
855 code = (code << 8) | p->buf[i];
856 if (code == MAIN_STARTCODE)
857 return AVPROBE_SCORE_MAX;
862 static int decode_main_header(NUTContext *nut){
863 AVFormatContext *s= nut->avf;
864 ByteIOContext *bc = &s->pb;
866 int i, j, tmp_stream, tmp_mul, tmp_time, tmp_size, count, tmp_res;
868 get_packetheader(nut, bc, 1);
872 av_log(s, AV_LOG_ERROR, "bad version (%Ld)\n", tmp);
876 nut->stream_count = get_v(bc);
877 nut->max_distance = get_v(bc);
878 nut->rate_num= get_v(bc);
879 nut->rate_den= get_v(bc);
880 nut->short_startcode= get_v(bc);
881 if(nut->short_startcode>>16 != 'N'){
882 av_log(s, AV_LOG_ERROR, "invalid short startcode %X\n", nut->short_startcode);
887 int tmp_flags = get_v(bc);
888 int tmp_fields= get_v(bc);
889 if(tmp_fields>0) tmp_time = get_s(bc);
890 if(tmp_fields>1) tmp_mul = get_v(bc);
891 if(tmp_fields>2) tmp_stream= get_v(bc);
892 if(tmp_fields>3) tmp_size = get_v(bc);
894 if(tmp_fields>4) tmp_res = get_v(bc);
896 if(tmp_fields>5) count = get_v(bc);
897 else count = tmp_mul - tmp_size;
899 while(tmp_fields-- > 6)
902 if(count == 0 || i+count > 256){
903 av_log(s, AV_LOG_ERROR, "illegal count %d at %d\n", count, i);
906 if(tmp_stream > nut->stream_count + 1){
907 av_log(s, AV_LOG_ERROR, "illegal stream number\n");
911 for(j=0; j<count; j++,i++){
912 nut->frame_code[i].flags = tmp_flags ;
913 nut->frame_code[i].timestamp_delta = tmp_time ;
914 nut->frame_code[i].stream_id_plus1 = tmp_stream;
915 nut->frame_code[i].size_mul = tmp_mul ;
916 nut->frame_code[i].size_lsb = tmp_size+j;
917 nut->frame_code[i].reserved_count = tmp_res ;
920 if(nut->frame_code['N'].flags != FLAG_INVALID){
921 av_log(s, AV_LOG_ERROR, "illegal frame_code table\n");
925 if(check_checksum(bc)){
926 av_log(s, AV_LOG_ERROR, "Main header checksum missmatch\n");
933 static int decode_stream_header(NUTContext *nut){
934 AVFormatContext *s= nut->avf;
935 ByteIOContext *bc = &s->pb;
936 int class, nom, denom, stream_id;
940 get_packetheader(nut, bc, 1);
941 stream_id= get_v(bc);
942 if(stream_id >= nut->stream_count || s->streams[stream_id])
945 st = av_new_stream(s, stream_id);
947 return AVERROR_NOMEM;
950 st->codec.codec_tag= tmp;
954 st->codec.codec_type = CODEC_TYPE_VIDEO;
955 st->codec.codec_id = codec_get_bmp_id(tmp);
956 if (st->codec.codec_id == CODEC_ID_NONE)
957 av_log(s, AV_LOG_ERROR, "Unknown codec?!\n");
960 st->codec.codec_type = CODEC_TYPE_AUDIO;
961 st->codec.codec_id = codec_get_wav_id(tmp);
962 if (st->codec.codec_id == CODEC_ID_NONE)
963 av_log(s, AV_LOG_ERROR, "Unknown codec?!\n");
966 av_log(s, AV_LOG_ERROR, "Unknown stream class (%d)\n", class);
969 s->bit_rate += get_v(bc);
970 get_vb(bc); /* language code */
973 nut->stream[stream_id].msb_timestamp_shift = get_v(bc);
974 nut->stream[stream_id].decode_delay= get_v(bc);
975 get_byte(bc); /* flags */
977 /* codec specific data headers */
978 while(get_v(bc) != 0){
979 st->codec.extradata_size= get_v(bc);
980 st->codec.extradata= av_mallocz(st->codec.extradata_size);
981 get_buffer(bc, st->codec.extradata, st->codec.extradata_size);
982 // url_fskip(bc, get_v(bc));
985 if (class == 0) /* VIDEO */
987 st->codec.width = get_v(bc);
988 st->codec.height = get_v(bc);
989 st->codec.sample_aspect_ratio.num= get_v(bc);
990 st->codec.sample_aspect_ratio.den= get_v(bc);
991 get_v(bc); /* csp type */
993 st->codec.frame_rate = nom;
994 st->codec.frame_rate_base = denom;
996 if (class == 32) /* AUDIO */
998 st->codec.sample_rate = get_v(bc);
999 get_v(bc); // samplerate_den
1000 st->codec.channels = get_v(bc);
1002 if(check_checksum(bc)){
1003 av_log(s, AV_LOG_ERROR, "Stream header %d checksum missmatch\n", stream_id);
1006 nut->stream[stream_id].rate_num= nom;
1007 nut->stream[stream_id].rate_den= denom;
1011 static int decode_info_header(NUTContext *nut){
1012 AVFormatContext *s= nut->avf;
1013 ByteIOContext *bc = &s->pb;
1015 get_packetheader(nut, bc, 1);
1019 char *name, *type, custom_name[256], custom_type[256];
1023 else if(id >= sizeof(info_table)/sizeof(info_table[0])){
1024 av_log(s, AV_LOG_ERROR, "info id is too large %d %d\n", id, sizeof(info_table)/sizeof(info_table[0]));
1028 type= info_table[id][1];
1029 name= info_table[id][0];
1030 //av_log(s, AV_LOG_DEBUG, "%d %s %s\n", id, type, name);
1033 get_str(bc, custom_type, sizeof(custom_type));
1037 get_str(bc, custom_name, sizeof(custom_name));
1041 if(!strcmp(type, "v")){
1042 int value= get_v(bc);
1044 if(!strcmp(name, "Author"))
1045 get_str(bc, s->author, sizeof(s->author));
1046 else if(!strcmp(name, "Title"))
1047 get_str(bc, s->title, sizeof(s->title));
1048 else if(!strcmp(name, "Copyright"))
1049 get_str(bc, s->copyright, sizeof(s->copyright));
1050 else if(!strcmp(name, "Description"))
1051 get_str(bc, s->comment, sizeof(s->comment));
1053 get_str(bc, NULL, 0);
1056 if(check_checksum(bc)){
1057 av_log(s, AV_LOG_ERROR, "Info header checksum missmatch\n");
1063 static int nut_read_header(AVFormatContext *s, AVFormatParameters *ap)
1065 NUTContext *nut = s->priv_data;
1066 ByteIOContext *bc = &s->pb;
1068 int inited_stream_count;
1072 av_set_pts_info(s, 60, 1, AV_TIME_BASE);
1077 pos= find_startcode(bc, MAIN_STARTCODE, pos)+1;
1079 av_log(s, AV_LOG_ERROR, "no main startcode found\n");
1082 if(decode_main_header(nut) >= 0)
1089 nut->stream = av_malloc(sizeof(StreamContext)*nut->stream_count);
1091 /* stream headers */
1093 for(inited_stream_count=0; inited_stream_count < nut->stream_count;){
1094 pos= find_startcode(bc, STREAM_STARTCODE, pos)+1;
1096 av_log(s, AV_LOG_ERROR, "not all stream headers found\n");
1099 if(decode_stream_header(nut) >= 0)
1100 inited_stream_count++;
1106 uint64_t startcode= find_any_startcode(bc, pos);
1110 av_log(s, AV_LOG_ERROR, "EOF before video frames\n");
1112 }else if(startcode == KEYFRAME_STARTCODE){
1113 nut->next_startcode= startcode;
1115 }else if(startcode != INFO_STARTCODE){
1119 decode_info_header(nut);
1125 static int decode_frame_header(NUTContext *nut, int *key_frame_ret, int64_t *pts_ret, int *stream_id_ret, int frame_code, int frame_type, int64_t frame_start){
1126 AVFormatContext *s= nut->avf;
1127 StreamContext *stream;
1128 ByteIOContext *bc = &s->pb;
1129 int size, flags, size_mul, size_lsb, stream_id, time_delta;
1132 if(frame_type < 2 && frame_start - nut->packet_start[2] > nut->max_distance){
1133 av_log(s, AV_LOG_ERROR, "last frame must have been damaged\n");
1138 nut->packet_start[ frame_type ]= frame_start; //otherwise 1 goto 1 may happen
1140 flags= nut->frame_code[frame_code].flags;
1141 size_mul= nut->frame_code[frame_code].size_mul;
1142 size_lsb= nut->frame_code[frame_code].size_lsb;
1143 stream_id= nut->frame_code[frame_code].stream_id_plus1 - 1;
1144 time_delta= nut->frame_code[frame_code].timestamp_delta;
1147 stream_id= get_v(bc);
1148 if(stream_id >= s->nb_streams){
1149 av_log(s, AV_LOG_ERROR, "illegal stream_id\n");
1152 stream= &nut->stream[stream_id];
1154 // 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]);
1156 *key_frame_ret= !!(flags & FLAG_KEY_FRAME);
1159 int64_t mask = (1<<stream->msb_timestamp_shift)-1;
1164 if(stream->last_pts == AV_NOPTS_VALUE){
1165 av_log(s, AV_LOG_ERROR, "no reference pts available\n");
1168 pts= lsb2full(stream, pts);
1171 if(stream->last_pts == AV_NOPTS_VALUE){
1172 av_log(s, AV_LOG_ERROR, "no reference pts available\n");
1175 pts= stream->last_pts + time_delta;
1179 int64_t av_pts= pts * AV_TIME_BASE * stream->rate_den / stream->rate_num;
1180 // av_log(s, AV_LOG_DEBUG, "stream:%d start:%lld pts:%lld length:%lld\n",stream_id, frame_start, av_pts, frame_start - nut->stream[stream_id].last_sync_pos);
1182 s->streams[stream_id],
1185 frame_start - nut->stream[stream_id].last_sync_pos,
1187 nut->stream[stream_id].last_sync_pos= frame_start;
1188 // assert(nut->packet_start == frame_start);
1191 assert(size_mul > size_lsb);
1193 if(flags & FLAG_DATA_SIZE)
1194 size+= size_mul*get_v(bc);
1197 av_log(s, AV_LOG_DEBUG, "fs:%lld fc:%d ft:%d kf:%d pts:%lld size:%d mul:%d lsb:%d flags:%d delta:%d\n", frame_start, frame_code, frame_type, *key_frame_ret, pts, size, size_mul, size_lsb, flags, time_delta);
1200 if(frame_type==0 && url_ftell(bc) - nut->packet_start[2] + size > nut->max_distance){
1201 av_log(s, AV_LOG_ERROR, "frame size too large\n");
1205 *stream_id_ret = stream_id;
1206 *pts_ret = pts * AV_TIME_BASE * stream->rate_den / stream->rate_num;
1208 update(nut, stream_id, frame_start, frame_type, frame_code, *key_frame_ret, size, pts);
1213 static int decode_frame(NUTContext *nut, AVPacket *pkt, int frame_code, int frame_type, int64_t frame_start){
1214 AVFormatContext *s= nut->avf;
1215 ByteIOContext *bc = &s->pb;
1216 int size, stream_id, key_frame;
1219 size= decode_frame_header(nut, &key_frame, &pts, &stream_id, frame_code, frame_type, frame_start);
1223 av_new_packet(pkt, size);
1224 get_buffer(bc, pkt->data, size);
1225 pkt->stream_index = stream_id;
1227 pkt->flags |= PKT_FLAG_KEY;
1233 static int nut_read_packet(AVFormatContext *s, AVPacket *pkt)
1235 NUTContext *nut = s->priv_data;
1236 ByteIOContext *bc = &s->pb;
1237 int i, frame_code=0;
1240 int64_t pos= url_ftell(bc);
1242 uint64_t tmp= nut->next_startcode;
1243 nut->next_startcode=0;
1251 frame_code = get_byte(bc);
1252 if(frame_code == 'N'){
1255 tmp = (tmp<<8) + get_byte(bc);
1259 case MAIN_STARTCODE:
1260 case STREAM_STARTCODE:
1261 case INDEX_STARTCODE:
1262 get_packetheader(nut, bc, 0);
1263 assert(nut->packet_start[2] == pos);
1264 url_fseek(bc, nut->written_packet_size + nut->packet_start[2], SEEK_SET);
1266 case INFO_STARTCODE:
1267 if(decode_info_header(nut)<0)
1270 case KEYFRAME_STARTCODE:
1272 reset(s, get_v(bc));
1273 frame_code = get_byte(bc);
1275 if(decode_frame(nut, pkt, frame_code, frame_type, pos)>=0)
1279 av_log(s, AV_LOG_DEBUG, "syncing from %lld\n", nut->packet_start[2]+1);
1280 tmp= find_any_startcode(bc, nut->packet_start[2]+1);
1283 av_log(s, AV_LOG_DEBUG, "sync\n");
1284 nut->next_startcode= tmp;
1289 static int64_t nut_read_timestamp(AVFormatContext *s, int stream_index, int64_t *pos_arg, int64_t pos_limit){
1290 NUTContext *nut = s->priv_data;
1291 StreamContext *stream;
1292 ByteIOContext *bc = &s->pb;
1295 int frame_code,step, stream_id, i,size, key_frame;
1296 av_log(s, AV_LOG_DEBUG, "read_timestamp(X,%d,%lld,%lld)\n", stream_index, *pos_arg, pos_limit);
1299 return AV_NOPTS_VALUE;
1302 step= FFMIN(16*1024, pos);
1305 code= find_any_startcode(bc, pos);
1307 if(code && url_ftell(bc) - 8 <= *pos_arg)
1309 step= FFMIN(2*step, pos);
1312 if(!code) //nothing found, not even after pos_arg
1313 return AV_NOPTS_VALUE;
1315 url_fseek(bc, -8, SEEK_CUR);
1316 for(i=0; i<s->nb_streams; i++)
1317 nut->stream[i].last_sync_pos= url_ftell(bc);
1321 int64_t pos= url_ftell(bc);
1324 if(pos > pos_limit || url_feof(bc))
1325 return AV_NOPTS_VALUE;
1327 frame_code = get_byte(bc);
1328 if(frame_code == 'N'){
1331 tmp = (tmp<<8) + get_byte(bc);
1333 //av_log(s, AV_LOG_DEBUG, "before switch %llX at=%lld\n", tmp, pos);
1336 case MAIN_STARTCODE:
1337 case STREAM_STARTCODE:
1338 case INDEX_STARTCODE:
1339 case INFO_STARTCODE:
1340 get_packetheader(nut, bc, 0);
1341 assert(nut->packet_start[2]==pos);
1342 url_fseek(bc, nut->written_packet_size + pos, SEEK_SET);
1344 case KEYFRAME_STARTCODE:
1346 reset(s, get_v(bc));
1347 frame_code = get_byte(bc);
1349 size= decode_frame_header(nut, &key_frame, &pts, &stream_id, frame_code, frame_type, pos);
1353 stream= &nut->stream[stream_id];
1354 if(stream_id != stream_index || !key_frame || pos < *pos_arg){
1355 url_fseek(bc, size, SEEK_CUR);
1363 av_log(s, AV_LOG_DEBUG, "syncing from %lld\n", nut->packet_start[2]+1);
1364 if(!find_any_startcode(bc, nut->packet_start[2]+1))
1365 return AV_NOPTS_VALUE;
1367 url_fseek(bc, -8, SEEK_CUR);
1370 return AV_NOPTS_VALUE;
1373 static int nut_read_seek(AVFormatContext *s, int stream_index, int64_t target_ts){
1374 // NUTContext *nut = s->priv_data;
1377 if(av_seek_frame_binary(s, stream_index, target_ts) < 0)
1380 pos= url_ftell(&s->pb);
1381 nut_read_timestamp(s, stream_index, &pos, pos-1);
1386 static int nut_read_close(AVFormatContext *s)
1388 NUTContext *nut = s->priv_data;
1391 for(i=0;i<s->nb_streams;i++) {
1392 av_freep(&s->streams[i]->codec.extradata);
1394 av_freep(&nut->stream);
1399 static AVInputFormat nut_iformat = {
1409 .extensions = "nut",
1412 #ifdef CONFIG_ENCODERS
1413 static AVOutputFormat nut_oformat = {
1419 #ifdef CONFIG_VORBIS
1421 #elif defined(CONFIG_MP3LAME)
1424 CODEC_ID_MP2, /* AC3 needs liba52 decoder */
1431 #endif //CONFIG_ENCODERS
1435 av_register_input_format(&nut_iformat);
1436 #ifdef CONFIG_ENCODERS
1437 av_register_output_format(&nut_oformat);
1438 #endif //CONFIG_ENCODERS