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 ID_STRING "nut/multimedia container\0"
54 #define MAX_DISTANCE (1024*16-1)
55 #define MAX_SHORT_DISTANCE (1024*4-1)
57 #define FLAG_DATA_SIZE 1
58 #define FLAG_KEY_FRAME 2
59 #define FLAG_INVALID 4
63 uint8_t stream_id_plus1;
66 int16_t timestamp_delta;
67 uint8_t reserved_count;
72 int msb_timestamp_shift;
76 int64_t last_sync_pos; ///<pos of last 1/2 type frame
82 int written_packet_size;
83 int64_t packet_start[3]; //0-> startcode less, 1-> short startcode 2-> long startcodes
84 FrameCode frame_code[256];
86 uint64_t next_startcode; ///< stores the next startcode if it has alraedy been parsed but the stream isnt seekable
87 StreamContext *stream;
89 int max_short_distance;
95 static char *info_table[][2]={
96 {NULL , NULL }, // end
103 {"StartTimestamp" , "v"},
104 {"EndTimestamp" , "v"},
107 {"Description" , "UTF8"},
108 {"Copyright" , "UTF8"},
109 {"Encoder" , "UTF8"},
110 {"Keyword" , "UTF8"},
115 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){
116 StreamContext *stream= &nut->stream[stream_index];
118 stream->last_key_frame= key_frame;
119 nut->packet_start[ frame_type ]= frame_start;
120 stream->last_pts= pts;
123 static void reset(AVFormatContext *s, int64_t global_ts){
124 NUTContext *nut = s->priv_data;
127 for(i=0; i<s->nb_streams; i++){
128 StreamContext *stream= &nut->stream[i];
130 stream->last_key_frame= 1;
132 stream->last_pts= av_rescale(global_ts, stream->rate_num*(int64_t)nut->rate_den, stream->rate_den*(int64_t)nut->rate_num);
136 static void build_frame_code(AVFormatContext *s){
137 NUTContext *nut = s->priv_data;
138 int key_frame, index, pred, stream_id;
141 int keyframe_0_esc= s->nb_streams > 2;
145 /* keyframe = 0 escape */
146 FrameCode *ft= &nut->frame_code[start];
147 ft->flags= FLAG_DATA_SIZE;
148 ft->stream_id_plus1= 0;
150 ft->timestamp_delta=0;
154 for(stream_id= 0; stream_id<s->nb_streams; stream_id++){
155 int start2= start + (end-start)*stream_id / s->nb_streams;
156 int end2 = start + (end-start)*(stream_id+1) / s->nb_streams;
157 AVCodecContext *codec = &s->streams[stream_id]->codec;
158 int is_audio= codec->codec_type == CODEC_TYPE_AUDIO;
159 int intra_only= /*codec->intra_only || */is_audio;
162 for(key_frame=0; key_frame<2; key_frame++){
163 if(intra_only && keyframe_0_esc && key_frame==0)
167 FrameCode *ft= &nut->frame_code[start2];
168 ft->flags= FLAG_KEY_FRAME*key_frame;
169 ft->flags|= FLAG_DATA_SIZE;
170 ft->stream_id_plus1= stream_id + 1;
172 ft->timestamp_delta=0;
177 key_frame= intra_only;
180 int frame_bytes= codec->frame_size*(int64_t)codec->bit_rate / (8*codec->sample_rate);
182 for(pts=0; pts<2; pts++){
183 for(pred=0; pred<2; pred++){
184 FrameCode *ft= &nut->frame_code[start2];
185 ft->flags= FLAG_KEY_FRAME*key_frame;
186 ft->stream_id_plus1= stream_id + 1;
187 ft->size_mul=frame_bytes + 2;
188 ft->size_lsb=frame_bytes + pred;
189 ft->timestamp_delta=pts;
194 FrameCode *ft= &nut->frame_code[start2];
195 ft->flags= FLAG_KEY_FRAME | FLAG_DATA_SIZE;
196 ft->stream_id_plus1= stream_id + 1;
198 ft->timestamp_delta=1;
203 if(codec->has_b_frames){
210 }else if(codec->codec_id == CODEC_ID_VORBIS){
220 for(pred=0; pred<pred_count; pred++){
221 int start3= start2 + (end2-start2)*pred / pred_count;
222 int end3 = start2 + (end2-start2)*(pred+1) / pred_count;
224 for(index=start3; index<end3; index++){
225 FrameCode *ft= &nut->frame_code[index];
226 ft->flags= FLAG_KEY_FRAME*key_frame;
227 ft->flags|= FLAG_DATA_SIZE;
228 ft->stream_id_plus1= stream_id + 1;
229 //FIXME use single byte size and pred from last
230 ft->size_mul= end3-start3;
231 ft->size_lsb= index - start3;
232 ft->timestamp_delta= pred_table[pred];
236 memmove(&nut->frame_code['N'+1], &nut->frame_code['N'], sizeof(FrameCode)*(255-'N'));
237 nut->frame_code['N'].flags= FLAG_INVALID;
240 static uint64_t get_v(ByteIOContext *bc)
246 int tmp = get_byte(bc);
249 val= (val<<7) + tmp - 0x80;
251 //av_log(NULL, AV_LOG_DEBUG, "get_v()= %lld\n", (val<<7) + tmp);
252 return (val<<7) + tmp;
258 static int get_str(ByteIOContext *bc, char *string, int maxlen){
262 get_buffer(bc, string, FFMIN(len, maxlen));
269 string[FFMIN(len, maxlen-1)]= 0;
277 static int64_t get_s(ByteIOContext *bc){
278 int64_t v = get_v(bc) + 1;
280 if (v&1) return -(v>>1);
284 static uint64_t get_vb(ByteIOContext *bc){
292 val = (val<<8) + get_byte(bc);
294 //av_log(NULL, AV_LOG_DEBUG, "get_vb()= %lld\n", val);
299 static inline uint64_t get_v_trace(ByteIOContext *bc, char *file, char *func, int line){
300 uint64_t v= get_v(bc);
302 printf("get_v %5lld / %llX in %s %s:%d\n", v, v, file, func, line);
306 static inline int64_t get_s_trace(ByteIOContext *bc, char *file, char *func, int line){
307 int64_t v= get_s(bc);
309 printf("get_s %5lld / %llX in %s %s:%d\n", v, v, file, func, line);
313 static inline uint64_t get_vb_trace(ByteIOContext *bc, char *file, char *func, int line){
314 uint64_t v= get_vb(bc);
316 printf("get_vb %5lld / %llX in %s %s:%d\n", v, v, file, func, line);
319 #define get_v(bc) get_v_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__)
320 #define get_s(bc) get_s_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__)
321 #define get_vb(bc) get_vb_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__)
325 static int get_packetheader(NUTContext *nut, ByteIOContext *bc, int calculate_checksum)
328 start= url_ftell(bc) - 8;
330 init_checksum(bc, calculate_checksum ? update_adler32 : NULL, 0);
334 nut->packet_start[2] = start;
335 nut->written_packet_size= size;
340 static int check_checksum(ByteIOContext *bc){
341 unsigned long checksum= get_checksum(bc);
342 return checksum != get_be32(bc);
348 static int get_length(uint64_t val){
351 for (i=7; val>>i; i+=7);
356 static uint64_t find_any_startcode(ByteIOContext *bc, int64_t pos){
360 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
362 while(!url_feof(bc)){
363 state= (state<<8) | get_byte(bc);
364 if((state>>56) != 'N')
368 case STREAM_STARTCODE:
369 case KEYFRAME_STARTCODE:
371 case INDEX_STARTCODE:
380 * find the given startcode.
381 * @param code the startcode
382 * @param pos the start position of the search, or -1 if the current position
383 * @returns the position of the startcode or -1 if not found
385 static int64_t find_startcode(ByteIOContext *bc, uint64_t code, int64_t pos){
387 uint64_t startcode= find_any_startcode(bc, pos);
388 if(startcode == code)
389 return url_ftell(bc) - 8;
390 else if(startcode == 0)
396 #ifdef CONFIG_ENCODERS
398 static void put_v(ByteIOContext *bc, uint64_t val)
402 //av_log(NULL, AV_LOG_DEBUG, "put_v()= %lld\n", val);
403 val &= 0x7FFFFFFFFFFFFFFFULL; // FIXME can only encode upto 63 bits currently
406 for (i-=7; i>0; i-=7){
407 put_byte(bc, 0x80 | (val>>i));
410 put_byte(bc, val&0x7f);
414 * stores a string as vb.
416 static void put_str(ByteIOContext *bc, const char *string){
417 int len= strlen(string);
420 put_buffer(bc, string, len);
423 static void put_s(ByteIOContext *bc, uint64_t val){
424 if (val<=0) put_v(bc, -2*val );
425 else put_v(bc, 2*val-1);
428 static void put_vb(ByteIOContext *bc, uint64_t val){
431 for (i=8; val>>i; i+=8);
434 for(i-=8; i>=0; i-=8)
435 put_byte(bc, (val>>i)&0xFF);
439 static inline void put_v_trace(ByteIOContext *bc, uint64_t v, char *file, char *func, int line){
440 printf("get_v %5lld / %llX in %s %s:%d\n", v, v, file, func, line);
445 static inline void put_s_trace(ByteIOContext *bc, int64_t v, char *file, char *func, int line){
446 printf("get_s %5lld / %llX in %s %s:%d\n", v, v, file, func, line);
451 static inline void put_vb_trace(ByteIOContext *bc, uint64_t v, char *file, char *func, int line){
452 printf("get_vb %5lld / %llX in %s %s:%d\n", v, v, file, func, line);
456 #define put_v(bc, v) put_v_trace(bc, v, __FILE__, __PRETTY_FUNCTION__, __LINE__)
457 #define put_s(bc, v) put_s_trace(bc, v, __FILE__, __PRETTY_FUNCTION__, __LINE__)
458 #define put_vb(bc, v) put_vb_trace(bc, v, __FILE__, __PRETTY_FUNCTION__, __LINE__)
461 static int put_packetheader(NUTContext *nut, ByteIOContext *bc, int max_size, int calculate_checksum)
463 put_flush_packet(bc);
464 nut->packet_start[2]+= nut->written_packet_size;
465 assert(url_ftell(bc) - 8 == nut->packet_start[2]);
466 nut->written_packet_size = max_size;
468 if(calculate_checksum)
469 init_checksum(bc, update_adler32, 0);
472 put_v(bc, nut->written_packet_size); /* forward ptr */
477 static int update_packetheader(NUTContext *nut, ByteIOContext *bc, int additional_size, int calculate_checksum){
478 int64_t start= nut->packet_start[2];
479 int64_t cur= url_ftell(bc);
480 int size= cur - start + additional_size;
482 if(calculate_checksum)
485 if(size != nut->written_packet_size){
488 assert( size <= nut->written_packet_size );
490 url_fseek(bc, start + 8, SEEK_SET);
491 for(i=get_length(size); i < get_length(nut->written_packet_size); i+=7)
495 url_fseek(bc, cur, SEEK_SET);
496 nut->written_packet_size= size; //FIXME may fail if multiple updates with differing sizes, as get_length may differ
498 if(calculate_checksum)
499 put_be32(bc, get_checksum(bc));
505 static int nut_write_header(AVFormatContext *s)
507 NUTContext *nut = s->priv_data;
508 ByteIOContext *bc = &s->pb;
509 AVCodecContext *codec;
510 int i, j, tmp_time, tmp_flags,tmp_stream, tmp_mul, tmp_size, tmp_fields;
515 av_mallocz(sizeof(StreamContext)*s->nb_streams);
518 put_buffer(bc, ID_STRING, strlen(ID_STRING));
520 nut->packet_start[2]= url_ftell(bc);
523 put_be64(bc, MAIN_STARTCODE);
524 put_packetheader(nut, bc, 120+5*256, 1);
525 put_v(bc, 2); /* version */
526 put_v(bc, s->nb_streams);
527 put_v(bc, MAX_DISTANCE);
528 put_v(bc, MAX_SHORT_DISTANCE);
530 put_v(bc, nut->rate_num=1);
531 put_v(bc, nut->rate_den=2);
532 put_v(bc, nut->short_startcode=0x4EFE79);
535 assert(nut->frame_code['N'].flags == FLAG_INVALID);
537 tmp_time= tmp_flags= tmp_stream= tmp_mul= tmp_size= /*tmp_res=*/ INT_MAX;
541 if(tmp_time != nut->frame_code[i].timestamp_delta) tmp_fields=1;
542 if(tmp_mul != nut->frame_code[i].size_mul ) tmp_fields=2;
543 if(tmp_stream != nut->frame_code[i].stream_id_plus1) tmp_fields=3;
544 if(tmp_size != nut->frame_code[i].size_lsb ) tmp_fields=4;
545 // if(tmp_res != nut->frame_code[i].res ) tmp_fields=5;
547 tmp_time = nut->frame_code[i].timestamp_delta;
548 tmp_flags = nut->frame_code[i].flags;
549 tmp_stream= nut->frame_code[i].stream_id_plus1;
550 tmp_mul = nut->frame_code[i].size_mul;
551 tmp_size = nut->frame_code[i].size_lsb;
552 // tmp_res = nut->frame_code[i].res;
554 for(j=0; i<256; j++,i++){
555 if(nut->frame_code[i].timestamp_delta != tmp_time ) break;
556 if(nut->frame_code[i].flags != tmp_flags ) break;
557 if(nut->frame_code[i].stream_id_plus1 != tmp_stream) break;
558 if(nut->frame_code[i].size_mul != tmp_mul ) break;
559 if(nut->frame_code[i].size_lsb != tmp_size+j) break;
560 // if(nut->frame_code[i].res != tmp_res ) break;
562 if(j != tmp_mul - tmp_size) tmp_fields=6;
564 put_v(bc, tmp_flags);
565 put_v(bc, tmp_fields);
566 if(tmp_fields>0) put_s(bc, tmp_time);
567 if(tmp_fields>1) put_v(bc, tmp_mul);
568 if(tmp_fields>2) put_v(bc, tmp_stream);
569 if(tmp_fields>3) put_v(bc, tmp_size);
570 if(tmp_fields>4) put_v(bc, 0 /*tmp_res*/);
571 if(tmp_fields>5) put_v(bc, j);
574 update_packetheader(nut, bc, 0, 1);
577 for (i = 0; i < s->nb_streams; i++)
581 codec = &s->streams[i]->codec;
583 put_be64(bc, STREAM_STARTCODE);
584 put_packetheader(nut, bc, 120 + codec->extradata_size, 1);
585 put_v(bc, i /*s->streams[i]->index*/);
586 put_v(bc, (codec->codec_type == CODEC_TYPE_AUDIO) ? 32 : 0);
587 if (codec->codec_tag)
588 put_vb(bc, codec->codec_tag);
589 else if (codec->codec_type == CODEC_TYPE_VIDEO)
591 put_vb(bc, codec_get_bmp_tag(codec->codec_id));
593 else if (codec->codec_type == CODEC_TYPE_AUDIO)
595 put_vb(bc, codec_get_wav_tag(codec->codec_id));
600 if (codec->codec_type == CODEC_TYPE_VIDEO)
602 nom = codec->frame_rate;
603 denom = codec->frame_rate_base;
607 nom = codec->sample_rate;
608 if(codec->frame_size>0)
609 denom= codec->frame_size;
613 gcd= ff_gcd(nom, denom);
616 nut->stream[i].rate_num= nom;
617 nut->stream[i].rate_den= denom;
618 av_set_pts_info(s->streams[i], 60, denom, nom);
620 put_v(bc, codec->bit_rate);
621 put_vb(bc, 0); /* no language code */
624 if(nom / denom < 1000)
625 nut->stream[i].msb_timestamp_shift = 7;
627 nut->stream[i].msb_timestamp_shift = 14;
628 put_v(bc, nut->stream[i].msb_timestamp_shift);
629 put_v(bc, codec->has_b_frames);
630 put_byte(bc, 0); /* flags: 0x1 - fixed_fps, 0x2 - index_present */
632 if(codec->extradata_size){
634 put_v(bc, codec->extradata_size);
635 put_buffer(bc, codec->extradata, codec->extradata_size);
637 put_v(bc, 0); /* end of codec specific headers */
639 switch(codec->codec_type)
641 case CODEC_TYPE_AUDIO:
642 put_v(bc, codec->sample_rate);
644 put_v(bc, codec->channels);
646 case CODEC_TYPE_VIDEO:
647 put_v(bc, codec->width);
648 put_v(bc, codec->height);
649 put_v(bc, codec->sample_aspect_ratio.num);
650 put_v(bc, codec->sample_aspect_ratio.den);
651 put_v(bc, 0); /* csp type -- unknown */
656 update_packetheader(nut, bc, 0, 1);
660 put_be64(bc, INFO_STARTCODE);
661 put_packetheader(nut, bc, 30+strlen(s->author)+strlen(s->title)+
662 strlen(s->comment)+strlen(s->copyright)+strlen(LIBAVFORMAT_IDENT), 1);
665 put_v(bc, 9); /* type */
666 put_str(bc, s->author);
670 put_v(bc, 10); /* type */
671 put_str(bc, s->title);
675 put_v(bc, 11); /* type */
676 put_str(bc, s->comment);
680 put_v(bc, 12); /* type */
681 put_str(bc, s->copyright);
684 if(!(s->streams[0]->codec.flags & CODEC_FLAG_BITEXACT)){
685 put_v(bc, 13); /* type */
686 put_str(bc, LIBAVFORMAT_IDENT);
689 put_v(bc, 0); /* eof info */
690 update_packetheader(nut, bc, 0, 1);
692 put_flush_packet(bc);
697 static int64_t lsb2full(StreamContext *stream, int64_t lsb){
698 int64_t mask = (1<<stream->msb_timestamp_shift)-1;
699 int64_t delta= stream->last_pts - mask/2;
700 return ((lsb - delta)&mask) + delta;
703 static int nut_write_packet(AVFormatContext *s, AVPacket *pkt)
705 NUTContext *nut = s->priv_data;
706 StreamContext *stream= &nut->stream[pkt->stream_index];
707 ByteIOContext *bc = &s->pb;
708 int key_frame = 0, full_pts=0;
711 int frame_type, best_length, frame_code, flags, i, size_mul, size_lsb, time_delta;
712 const int64_t frame_start= url_ftell(bc);
713 int64_t pts= pkt->pts;
715 int stream_index= pkt->stream_index;
717 enc = &s->streams[stream_index]->codec;
718 key_frame = !!(pkt->flags & PKT_FLAG_KEY);
721 if(frame_start + size + 20 - FFMAX(nut->packet_start[1], nut->packet_start[2]) > MAX_DISTANCE)
723 if(key_frame && !stream->last_key_frame)
727 int64_t global_ts= av_rescale(pts, stream->rate_den*(int64_t)nut->rate_num, stream->rate_num*(int64_t)nut->rate_den);
729 put_be64(bc, KEYFRAME_STARTCODE);
730 put_v(bc, global_ts);
732 assert(stream->last_pts != AV_NOPTS_VALUE);
733 coded_pts = pts & ((1<<stream->msb_timestamp_shift)-1);
734 if(lsb2full(stream, coded_pts) != pts)
738 coded_pts= pts + (1<<stream->msb_timestamp_shift);
742 for(i=0; i<256; i++){
743 int stream_id_plus1= nut->frame_code[i].stream_id_plus1;
746 size_mul= nut->frame_code[i].size_mul;
747 size_lsb= nut->frame_code[i].size_lsb;
748 time_delta= nut->frame_code[i].timestamp_delta;
749 flags= nut->frame_code[i].flags;
751 assert(size_mul > size_lsb);
753 if(stream_id_plus1 == 0) length+= get_length(stream_index);
754 else if(stream_id_plus1 - 1 != stream_index)
756 fc_key_frame= !!(flags & FLAG_KEY_FRAME);
758 assert(key_frame==0 || key_frame==1);
759 if(fc_key_frame != key_frame)
762 if(flags & FLAG_DATA_SIZE){
763 if(size % size_mul != size_lsb)
765 length += get_length(size / size_mul);
766 }else if(size != size_lsb)
769 if(full_pts && time_delta)
773 length += get_length(coded_pts);
775 if(time_delta != pts - stream->last_pts)
779 if(length < best_length){
783 // 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);
786 assert(frame_code != -1);
787 flags= nut->frame_code[frame_code].flags;
788 size_mul= nut->frame_code[frame_code].size_mul;
789 size_lsb= nut->frame_code[frame_code].size_lsb;
790 time_delta= nut->frame_code[frame_code].timestamp_delta;
793 best_length ++; //frame_code
795 best_length += 8; // startcode
797 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);
798 // 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]);
801 assert(frame_type != 1); //short startcode not implemented yet
802 put_byte(bc, frame_code);
804 if(nut->frame_code[frame_code].stream_id_plus1 == 0)
805 put_v(bc, stream_index);
807 put_v(bc, coded_pts);
809 if(flags & FLAG_DATA_SIZE)
810 put_v(bc, size / size_mul);
812 assert(size == size_lsb);
813 if(size > MAX_DISTANCE){
814 assert(frame_type > 1);
817 put_buffer(bc, pkt->data, size);
819 update(nut, stream_index, frame_start, frame_type, frame_code, key_frame, size, pts);
824 static int nut_write_trailer(AVFormatContext *s)
826 NUTContext *nut = s->priv_data;
827 ByteIOContext *bc = &s->pb;
834 for (i = 0; s->nb_streams; i++)
836 put_be64(bc, INDEX_STARTCODE);
837 put_packetheader(nut, bc, 64, 1);
838 put_v(bc, s->streams[i]->id);
840 update_packetheader(nut, bc, 0, 1);
844 put_flush_packet(bc);
846 av_freep(&nut->stream);
850 #endif //CONFIG_ENCODERS
852 static int nut_probe(AVProbeData *p)
857 for (i = 0; i < p->buf_size; i++) {
858 code = (code << 8) | p->buf[i];
859 if (code == MAIN_STARTCODE)
860 return AVPROBE_SCORE_MAX;
865 static int decode_main_header(NUTContext *nut){
866 AVFormatContext *s= nut->avf;
867 ByteIOContext *bc = &s->pb;
869 int i, j, tmp_stream, tmp_mul, tmp_time, tmp_size, count, tmp_res;
871 get_packetheader(nut, bc, 1);
875 av_log(s, AV_LOG_ERROR, "bad version (%Ld)\n", tmp);
879 nut->stream_count = get_v(bc);
880 nut->max_distance = get_v(bc);
881 nut->max_short_distance = get_v(bc);
882 nut->rate_num= get_v(bc);
883 nut->rate_den= get_v(bc);
884 nut->short_startcode= get_v(bc);
885 if(nut->short_startcode>>16 != 'N'){
886 av_log(s, AV_LOG_ERROR, "invalid short startcode %X\n", nut->short_startcode);
891 int tmp_flags = get_v(bc);
892 int tmp_fields= get_v(bc);
893 if(tmp_fields>0) tmp_time = get_s(bc);
894 if(tmp_fields>1) tmp_mul = get_v(bc);
895 if(tmp_fields>2) tmp_stream= get_v(bc);
896 if(tmp_fields>3) tmp_size = get_v(bc);
898 if(tmp_fields>4) tmp_res = get_v(bc);
900 if(tmp_fields>5) count = get_v(bc);
901 else count = tmp_mul - tmp_size;
903 while(tmp_fields-- > 6)
906 if(count == 0 || i+count > 256){
907 av_log(s, AV_LOG_ERROR, "illegal count %d at %d\n", count, i);
910 if(tmp_stream > nut->stream_count + 1){
911 av_log(s, AV_LOG_ERROR, "illegal stream number\n");
915 for(j=0; j<count; j++,i++){
916 nut->frame_code[i].flags = tmp_flags ;
917 nut->frame_code[i].timestamp_delta = tmp_time ;
918 nut->frame_code[i].stream_id_plus1 = tmp_stream;
919 nut->frame_code[i].size_mul = tmp_mul ;
920 nut->frame_code[i].size_lsb = tmp_size+j;
921 nut->frame_code[i].reserved_count = tmp_res ;
924 if(nut->frame_code['N'].flags != FLAG_INVALID){
925 av_log(s, AV_LOG_ERROR, "illegal frame_code table\n");
929 if(check_checksum(bc)){
930 av_log(s, AV_LOG_ERROR, "Main header checksum missmatch\n");
937 static int decode_stream_header(NUTContext *nut){
938 AVFormatContext *s= nut->avf;
939 ByteIOContext *bc = &s->pb;
940 int class, nom, denom, stream_id;
944 get_packetheader(nut, bc, 1);
945 stream_id= get_v(bc);
946 if(stream_id >= nut->stream_count || s->streams[stream_id])
949 st = av_new_stream(s, stream_id);
951 return AVERROR_NOMEM;
955 st->codec.codec_tag= tmp;
959 st->codec.codec_type = CODEC_TYPE_VIDEO;
960 st->codec.codec_id = codec_get_bmp_id(tmp);
961 if (st->codec.codec_id == CODEC_ID_NONE)
962 av_log(s, AV_LOG_ERROR, "Unknown codec?!\n");
965 st->codec.codec_type = CODEC_TYPE_AUDIO;
966 st->codec.codec_id = codec_get_wav_id(tmp);
967 if (st->codec.codec_id == CODEC_ID_NONE)
968 av_log(s, AV_LOG_ERROR, "Unknown codec?!\n");
971 av_log(s, AV_LOG_ERROR, "Unknown stream class (%d)\n", class);
974 s->bit_rate += get_v(bc);
975 get_vb(bc); /* language code */
978 nut->stream[stream_id].msb_timestamp_shift = get_v(bc);
979 nut->stream[stream_id].decode_delay= get_v(bc);
980 get_byte(bc); /* flags */
982 /* codec specific data headers */
983 while(get_v(bc) != 0){
984 st->codec.extradata_size= get_v(bc);
985 st->codec.extradata= av_mallocz(st->codec.extradata_size);
986 get_buffer(bc, st->codec.extradata, st->codec.extradata_size);
987 // url_fskip(bc, get_v(bc));
990 if (class == 0) /* VIDEO */
992 st->codec.width = get_v(bc);
993 st->codec.height = get_v(bc);
994 st->codec.sample_aspect_ratio.num= get_v(bc);
995 st->codec.sample_aspect_ratio.den= get_v(bc);
996 get_v(bc); /* csp type */
998 st->codec.frame_rate = nom;
999 st->codec.frame_rate_base = denom;
1001 if (class == 32) /* AUDIO */
1003 st->codec.sample_rate = get_v(bc);
1004 get_v(bc); // samplerate_den
1005 st->codec.channels = get_v(bc);
1007 if(check_checksum(bc)){
1008 av_log(s, AV_LOG_ERROR, "Stream header %d checksum missmatch\n", stream_id);
1011 av_set_pts_info(s->streams[stream_id], 60, denom, nom);
1012 nut->stream[stream_id].rate_num= nom;
1013 nut->stream[stream_id].rate_den= denom;
1017 static int decode_info_header(NUTContext *nut){
1018 AVFormatContext *s= nut->avf;
1019 ByteIOContext *bc = &s->pb;
1021 get_packetheader(nut, bc, 1);
1025 char *name, *type, custom_name[256], custom_type[256];
1029 else if(id >= sizeof(info_table)/sizeof(info_table[0])){
1030 av_log(s, AV_LOG_ERROR, "info id is too large %d %d\n", id, sizeof(info_table)/sizeof(info_table[0]));
1034 type= info_table[id][1];
1035 name= info_table[id][0];
1036 //av_log(s, AV_LOG_DEBUG, "%d %s %s\n", id, type, name);
1039 get_str(bc, custom_type, sizeof(custom_type));
1043 get_str(bc, custom_name, sizeof(custom_name));
1047 if(!strcmp(type, "v")){
1048 int value= get_v(bc);
1050 if(!strcmp(name, "Author"))
1051 get_str(bc, s->author, sizeof(s->author));
1052 else if(!strcmp(name, "Title"))
1053 get_str(bc, s->title, sizeof(s->title));
1054 else if(!strcmp(name, "Copyright"))
1055 get_str(bc, s->copyright, sizeof(s->copyright));
1056 else if(!strcmp(name, "Description"))
1057 get_str(bc, s->comment, sizeof(s->comment));
1059 get_str(bc, NULL, 0);
1062 if(check_checksum(bc)){
1063 av_log(s, AV_LOG_ERROR, "Info header checksum missmatch\n");
1069 static int nut_read_header(AVFormatContext *s, AVFormatParameters *ap)
1071 NUTContext *nut = s->priv_data;
1072 ByteIOContext *bc = &s->pb;
1074 int inited_stream_count;
1081 pos= find_startcode(bc, MAIN_STARTCODE, pos)+1;
1083 av_log(s, AV_LOG_ERROR, "no main startcode found\n");
1086 if(decode_main_header(nut) >= 0)
1093 nut->stream = av_malloc(sizeof(StreamContext)*nut->stream_count);
1095 /* stream headers */
1097 for(inited_stream_count=0; inited_stream_count < nut->stream_count;){
1098 pos= find_startcode(bc, STREAM_STARTCODE, pos)+1;
1100 av_log(s, AV_LOG_ERROR, "not all stream headers found\n");
1103 if(decode_stream_header(nut) >= 0)
1104 inited_stream_count++;
1110 uint64_t startcode= find_any_startcode(bc, pos);
1114 av_log(s, AV_LOG_ERROR, "EOF before video frames\n");
1116 }else if(startcode == KEYFRAME_STARTCODE){
1117 nut->next_startcode= startcode;
1119 }else if(startcode != INFO_STARTCODE){
1123 decode_info_header(nut);
1129 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){
1130 AVFormatContext *s= nut->avf;
1131 StreamContext *stream;
1132 ByteIOContext *bc = &s->pb;
1133 int size, flags, size_mul, size_lsb, stream_id, time_delta;
1136 if(frame_type < 2 && frame_start - nut->packet_start[2] > nut->max_distance){
1137 av_log(s, AV_LOG_ERROR, "last frame must have been damaged\n");
1142 nut->packet_start[ frame_type ]= frame_start; //otherwise 1 goto 1 may happen
1144 flags= nut->frame_code[frame_code].flags;
1145 size_mul= nut->frame_code[frame_code].size_mul;
1146 size_lsb= nut->frame_code[frame_code].size_lsb;
1147 stream_id= nut->frame_code[frame_code].stream_id_plus1 - 1;
1148 time_delta= nut->frame_code[frame_code].timestamp_delta;
1151 stream_id= get_v(bc);
1152 if(stream_id >= s->nb_streams){
1153 av_log(s, AV_LOG_ERROR, "illegal stream_id\n");
1156 stream= &nut->stream[stream_id];
1158 // 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]);
1160 *key_frame_ret= !!(flags & FLAG_KEY_FRAME);
1163 int64_t mask = (1<<stream->msb_timestamp_shift)-1;
1168 if(stream->last_pts == AV_NOPTS_VALUE){
1169 av_log(s, AV_LOG_ERROR, "no reference pts available\n");
1172 pts= lsb2full(stream, pts);
1175 if(stream->last_pts == AV_NOPTS_VALUE){
1176 av_log(s, AV_LOG_ERROR, "no reference pts available\n");
1179 pts= stream->last_pts + time_delta;
1183 // 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);
1185 s->streams[stream_id],
1188 frame_start - nut->stream[stream_id].last_sync_pos,
1190 nut->stream[stream_id].last_sync_pos= frame_start;
1191 // assert(nut->packet_start == frame_start);
1194 assert(size_mul > size_lsb);
1196 if(flags & FLAG_DATA_SIZE)
1197 size+= size_mul*get_v(bc);
1200 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);
1203 if(frame_type==0 && url_ftell(bc) - nut->packet_start[2] + size > nut->max_distance){
1204 av_log(s, AV_LOG_ERROR, "frame size too large\n");
1208 *stream_id_ret = stream_id;
1211 update(nut, stream_id, frame_start, frame_type, frame_code, *key_frame_ret, size, pts);
1216 static int decode_frame(NUTContext *nut, AVPacket *pkt, int frame_code, int frame_type, int64_t frame_start){
1217 AVFormatContext *s= nut->avf;
1218 ByteIOContext *bc = &s->pb;
1219 int size, stream_id, key_frame;
1222 size= decode_frame_header(nut, &key_frame, &pts, &stream_id, frame_code, frame_type, frame_start);
1226 av_new_packet(pkt, size);
1227 get_buffer(bc, pkt->data, size);
1228 pkt->stream_index = stream_id;
1230 pkt->flags |= PKT_FLAG_KEY;
1236 static int nut_read_packet(AVFormatContext *s, AVPacket *pkt)
1238 NUTContext *nut = s->priv_data;
1239 ByteIOContext *bc = &s->pb;
1240 int i, frame_code=0;
1243 int64_t pos= url_ftell(bc);
1245 uint64_t tmp= nut->next_startcode;
1246 nut->next_startcode=0;
1254 frame_code = get_byte(bc);
1255 if(frame_code == 'N'){
1258 tmp = (tmp<<8) + get_byte(bc);
1262 case MAIN_STARTCODE:
1263 case STREAM_STARTCODE:
1264 case INDEX_STARTCODE:
1265 get_packetheader(nut, bc, 0);
1266 assert(nut->packet_start[2] == pos);
1267 url_fseek(bc, nut->written_packet_size + nut->packet_start[2], SEEK_SET);
1269 case INFO_STARTCODE:
1270 if(decode_info_header(nut)<0)
1273 case KEYFRAME_STARTCODE:
1275 reset(s, get_v(bc));
1276 frame_code = get_byte(bc);
1278 if(decode_frame(nut, pkt, frame_code, frame_type, pos)>=0)
1282 av_log(s, AV_LOG_DEBUG, "syncing from %lld\n", nut->packet_start[2]+1);
1283 tmp= find_any_startcode(bc, nut->packet_start[2]+1);
1286 av_log(s, AV_LOG_DEBUG, "sync\n");
1287 nut->next_startcode= tmp;
1292 static int64_t nut_read_timestamp(AVFormatContext *s, int stream_index, int64_t *pos_arg, int64_t pos_limit){
1293 NUTContext *nut = s->priv_data;
1294 StreamContext *stream;
1295 ByteIOContext *bc = &s->pb;
1298 int frame_code,step, stream_id, i,size, key_frame;
1299 av_log(s, AV_LOG_DEBUG, "read_timestamp(X,%d,%lld,%lld)\n", stream_index, *pos_arg, pos_limit);
1302 return AV_NOPTS_VALUE;
1305 step= FFMIN(16*1024, pos);
1308 code= find_any_startcode(bc, pos);
1310 if(code && url_ftell(bc) - 8 <= *pos_arg)
1312 step= FFMIN(2*step, pos);
1315 if(!code) //nothing found, not even after pos_arg
1316 return AV_NOPTS_VALUE;
1318 url_fseek(bc, -8, SEEK_CUR);
1319 for(i=0; i<s->nb_streams; i++)
1320 nut->stream[i].last_sync_pos= url_ftell(bc);
1324 int64_t pos= url_ftell(bc);
1327 if(pos > pos_limit || url_feof(bc))
1328 return AV_NOPTS_VALUE;
1330 frame_code = get_byte(bc);
1331 if(frame_code == 'N'){
1334 tmp = (tmp<<8) + get_byte(bc);
1336 //av_log(s, AV_LOG_DEBUG, "before switch %llX at=%lld\n", tmp, pos);
1339 case MAIN_STARTCODE:
1340 case STREAM_STARTCODE:
1341 case INDEX_STARTCODE:
1342 case INFO_STARTCODE:
1343 get_packetheader(nut, bc, 0);
1344 assert(nut->packet_start[2]==pos);
1345 url_fseek(bc, nut->written_packet_size + pos, SEEK_SET);
1347 case KEYFRAME_STARTCODE:
1349 reset(s, get_v(bc));
1350 frame_code = get_byte(bc);
1352 size= decode_frame_header(nut, &key_frame, &pts, &stream_id, frame_code, frame_type, pos);
1356 stream= &nut->stream[stream_id];
1357 if(stream_id != stream_index || !key_frame || pos < *pos_arg){
1358 url_fseek(bc, size, SEEK_CUR);
1366 av_log(s, AV_LOG_DEBUG, "syncing from %lld\n", nut->packet_start[2]+1);
1367 if(!find_any_startcode(bc, nut->packet_start[2]+1))
1368 return AV_NOPTS_VALUE;
1370 url_fseek(bc, -8, SEEK_CUR);
1373 return AV_NOPTS_VALUE;
1376 static int nut_read_seek(AVFormatContext *s, int stream_index, int64_t target_ts){
1377 // NUTContext *nut = s->priv_data;
1380 if(av_seek_frame_binary(s, stream_index, target_ts) < 0)
1383 pos= url_ftell(&s->pb);
1384 nut_read_timestamp(s, stream_index, &pos, pos-1);
1389 static int nut_read_close(AVFormatContext *s)
1391 NUTContext *nut = s->priv_data;
1394 for(i=0;i<s->nb_streams;i++) {
1395 av_freep(&s->streams[i]->codec.extradata);
1397 av_freep(&nut->stream);
1402 static AVInputFormat nut_iformat = {
1412 .extensions = "nut",
1415 #ifdef CONFIG_ENCODERS
1416 static AVOutputFormat nut_oformat = {
1422 #ifdef CONFIG_VORBIS
1424 #elif defined(CONFIG_MP3LAME)
1427 CODEC_ID_MP2, /* AC3 needs liba52 decoder */
1434 #endif //CONFIG_ENCODERS
1438 av_register_input_format(&nut_iformat);
1439 #ifdef CONFIG_ENCODERS
1440 av_register_output_format(&nut_oformat);
1441 #endif //CONFIG_ENCODERS