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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 * Visit the official site at http://www.nut.hu/
28 * - index packet reading support
35 #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];
85 unsigned int stream_count;
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, unsigned int maxlen){
259 unsigned int len= get_v(bc);
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){
286 unsigned int i= get_v(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;
332 init_checksum(bc, calculate_checksum ? av_adler32_update : NULL, 1);
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 static int64_t lsb2full(StreamContext *stream, int64_t lsb){
397 int64_t mask = (1<<stream->msb_timestamp_shift)-1;
398 int64_t delta= stream->last_pts - mask/2;
399 return ((lsb - delta)&mask) + delta;
404 static void put_v(ByteIOContext *bc, uint64_t val)
408 //av_log(NULL, AV_LOG_DEBUG, "put_v()= %lld\n", val);
409 val &= 0x7FFFFFFFFFFFFFFFULL; // FIXME can only encode upto 63 bits currently
412 for (i-=7; i>0; i-=7){
413 put_byte(bc, 0x80 | (val>>i));
416 put_byte(bc, val&0x7f);
420 * stores a string as vb.
422 static void put_str(ByteIOContext *bc, const char *string){
423 int len= strlen(string);
426 put_buffer(bc, string, len);
429 static void put_s(ByteIOContext *bc, int64_t val){
430 if (val<=0) put_v(bc, -2*val );
431 else put_v(bc, 2*val-1);
434 static void put_vb(ByteIOContext *bc, uint64_t val){
437 for (i=8; val>>i; i+=8);
440 for(i-=8; i>=0; i-=8)
441 put_byte(bc, (val>>i)&0xFF);
445 static inline void put_v_trace(ByteIOContext *bc, uint64_t v, char *file, char *func, int line){
446 printf("get_v %5lld / %llX in %s %s:%d\n", v, v, file, func, line);
451 static inline void put_s_trace(ByteIOContext *bc, int64_t v, char *file, char *func, int line){
452 printf("get_s %5lld / %llX in %s %s:%d\n", v, v, file, func, line);
457 static inline void put_vb_trace(ByteIOContext *bc, uint64_t v, char *file, char *func, int line){
458 printf("get_vb %5lld / %llX in %s %s:%d\n", v, v, file, func, line);
462 #define put_v(bc, v) put_v_trace(bc, v, __FILE__, __PRETTY_FUNCTION__, __LINE__)
463 #define put_s(bc, v) put_s_trace(bc, v, __FILE__, __PRETTY_FUNCTION__, __LINE__)
464 #define put_vb(bc, v) put_vb_trace(bc, v, __FILE__, __PRETTY_FUNCTION__, __LINE__)
467 static int put_packetheader(NUTContext *nut, ByteIOContext *bc, int max_size, int calculate_checksum)
469 put_flush_packet(bc);
470 nut->packet_start[2]= url_ftell(bc) - 8;
471 nut->written_packet_size = max_size;
474 put_v(bc, nut->written_packet_size); /* forward ptr */
476 if(calculate_checksum)
477 init_checksum(bc, av_adler32_update, 1);
484 * must not be called more then once per packet
486 static int update_packetheader(NUTContext *nut, ByteIOContext *bc, int additional_size, int calculate_checksum){
487 int64_t start= nut->packet_start[2];
488 int64_t cur= url_ftell(bc);
489 int size= cur - start - get_length(nut->written_packet_size)/7 - 8;
491 if(calculate_checksum)
494 if(size != nut->written_packet_size){
497 assert( size <= nut->written_packet_size );
499 url_fseek(bc, start + 8, SEEK_SET);
500 for(i=get_length(size); i < get_length(nut->written_packet_size); i+=7)
504 url_fseek(bc, cur, SEEK_SET);
505 nut->written_packet_size= size; //FIXME may fail if multiple updates with differing sizes, as get_length may differ
507 if(calculate_checksum)
508 put_be32(bc, get_checksum(bc));
514 static int nut_write_header(AVFormatContext *s)
516 NUTContext *nut = s->priv_data;
517 ByteIOContext *bc = &s->pb;
518 AVCodecContext *codec;
519 int i, j, tmp_time, tmp_flags,tmp_stream, tmp_mul, tmp_size, tmp_fields;
521 if (strcmp(s->filename, "./data/b-libav.nut")) {
522 av_log(s, AV_LOG_ERROR, " libavformat NUT is non-compliant and disabled\n");
529 av_mallocz(sizeof(StreamContext)*s->nb_streams);
532 put_buffer(bc, ID_STRING, strlen(ID_STRING));
534 nut->packet_start[2]= url_ftell(bc);
537 put_be64(bc, MAIN_STARTCODE);
538 put_packetheader(nut, bc, 120+5*256, 1);
539 put_v(bc, 2); /* version */
540 put_v(bc, s->nb_streams);
541 put_v(bc, MAX_DISTANCE);
542 put_v(bc, MAX_SHORT_DISTANCE);
544 put_v(bc, nut->rate_num=1);
545 put_v(bc, nut->rate_den=2);
546 put_v(bc, nut->short_startcode=0x4EFE79);
549 assert(nut->frame_code['N'].flags == FLAG_INVALID);
551 tmp_time= tmp_flags= tmp_stream= tmp_mul= tmp_size= /*tmp_res=*/ INT_MAX;
555 if(tmp_time != nut->frame_code[i].timestamp_delta) tmp_fields=1;
556 if(tmp_mul != nut->frame_code[i].size_mul ) tmp_fields=2;
557 if(tmp_stream != nut->frame_code[i].stream_id_plus1) tmp_fields=3;
558 if(tmp_size != nut->frame_code[i].size_lsb ) tmp_fields=4;
559 // if(tmp_res != nut->frame_code[i].res ) tmp_fields=5;
561 tmp_time = nut->frame_code[i].timestamp_delta;
562 tmp_flags = nut->frame_code[i].flags;
563 tmp_stream= nut->frame_code[i].stream_id_plus1;
564 tmp_mul = nut->frame_code[i].size_mul;
565 tmp_size = nut->frame_code[i].size_lsb;
566 // tmp_res = nut->frame_code[i].res;
568 for(j=0; i<256; j++,i++){
569 if(nut->frame_code[i].timestamp_delta != tmp_time ) break;
570 if(nut->frame_code[i].flags != tmp_flags ) break;
571 if(nut->frame_code[i].stream_id_plus1 != tmp_stream) break;
572 if(nut->frame_code[i].size_mul != tmp_mul ) break;
573 if(nut->frame_code[i].size_lsb != tmp_size+j) break;
574 // if(nut->frame_code[i].res != tmp_res ) break;
576 if(j != tmp_mul - tmp_size) tmp_fields=6;
578 put_v(bc, tmp_flags);
579 put_v(bc, tmp_fields);
580 if(tmp_fields>0) put_s(bc, tmp_time);
581 if(tmp_fields>1) put_v(bc, tmp_mul);
582 if(tmp_fields>2) put_v(bc, tmp_stream);
583 if(tmp_fields>3) put_v(bc, tmp_size);
584 if(tmp_fields>4) put_v(bc, 0 /*tmp_res*/);
585 if(tmp_fields>5) put_v(bc, j);
588 update_packetheader(nut, bc, 0, 1);
591 for (i = 0; i < s->nb_streams; i++)
593 int nom, denom, ssize;
595 codec = s->streams[i]->codec;
597 put_be64(bc, STREAM_STARTCODE);
598 put_packetheader(nut, bc, 120 + codec->extradata_size, 1);
599 put_v(bc, i /*s->streams[i]->index*/);
600 switch(codec->codec_type){
601 case CODEC_TYPE_VIDEO: put_v(bc, 0); break;
602 case CODEC_TYPE_AUDIO: put_v(bc, 1); break;
603 // case CODEC_TYPE_TEXT : put_v(bc, 2); break;
604 case CODEC_TYPE_DATA : put_v(bc, 3); break;
607 if (codec->codec_tag)
608 put_vb(bc, codec->codec_tag);
609 else if (codec->codec_type == CODEC_TYPE_VIDEO)
611 put_vb(bc, codec_get_bmp_tag(codec->codec_id));
613 else if (codec->codec_type == CODEC_TYPE_AUDIO)
615 put_vb(bc, codec_get_wav_tag(codec->codec_id));
620 ff_parse_specific_params(codec, &nom, &ssize, &denom);
622 nut->stream[i].rate_num= nom;
623 nut->stream[i].rate_den= denom;
624 av_set_pts_info(s->streams[i], 60, denom, nom);
626 put_v(bc, codec->bit_rate);
627 put_vb(bc, 0); /* no language code */
630 if(nom / denom < 1000)
631 nut->stream[i].msb_timestamp_shift = 7;
633 nut->stream[i].msb_timestamp_shift = 14;
634 put_v(bc, nut->stream[i].msb_timestamp_shift);
635 put_v(bc, codec->has_b_frames);
636 put_byte(bc, 0); /* flags: 0x1 - fixed_fps, 0x2 - index_present */
638 if(codec->extradata_size){
640 put_v(bc, codec->extradata_size);
641 put_buffer(bc, codec->extradata, codec->extradata_size);
643 put_v(bc, 0); /* end of codec specific headers */
645 switch(codec->codec_type)
647 case CODEC_TYPE_AUDIO:
648 put_v(bc, codec->sample_rate);
650 put_v(bc, codec->channels);
652 case CODEC_TYPE_VIDEO:
653 put_v(bc, codec->width);
654 put_v(bc, codec->height);
655 put_v(bc, codec->sample_aspect_ratio.num);
656 put_v(bc, codec->sample_aspect_ratio.den);
657 put_v(bc, 0); /* csp type -- unknown */
662 update_packetheader(nut, bc, 0, 1);
666 put_be64(bc, INFO_STARTCODE);
667 put_packetheader(nut, bc, 30+strlen(s->author)+strlen(s->title)+
668 strlen(s->comment)+strlen(s->copyright)+strlen(LIBAVFORMAT_IDENT), 1);
671 put_v(bc, 9); /* type */
672 put_str(bc, s->author);
676 put_v(bc, 10); /* type */
677 put_str(bc, s->title);
681 put_v(bc, 11); /* type */
682 put_str(bc, s->comment);
686 put_v(bc, 12); /* type */
687 put_str(bc, s->copyright);
690 if(!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT)){
691 put_v(bc, 13); /* type */
692 put_str(bc, LIBAVFORMAT_IDENT);
695 put_v(bc, 0); /* eof info */
696 update_packetheader(nut, bc, 0, 1);
698 put_flush_packet(bc);
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_MUXERS
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 (%"PRId64")\n", tmp);
879 nut->stream_count = get_v(bc);
880 if(nut->stream_count > MAX_STREAMS){
881 av_log(s, AV_LOG_ERROR, "too many streams\n");
884 nut->max_distance = get_v(bc);
885 nut->max_short_distance = get_v(bc);
886 nut->rate_num= get_v(bc);
887 nut->rate_den= get_v(bc);
888 nut->short_startcode= get_v(bc);
889 if(nut->short_startcode>>16 != 'N'){
890 av_log(s, AV_LOG_ERROR, "invalid short startcode %X\n", nut->short_startcode);
895 int tmp_flags = get_v(bc);
896 int tmp_fields= get_v(bc);
897 if(tmp_fields>0) tmp_time = get_s(bc);
898 if(tmp_fields>1) tmp_mul = get_v(bc);
899 if(tmp_fields>2) tmp_stream= get_v(bc);
900 if(tmp_fields>3) tmp_size = get_v(bc);
902 if(tmp_fields>4) tmp_res = get_v(bc);
904 if(tmp_fields>5) count = get_v(bc);
905 else count = tmp_mul - tmp_size;
907 while(tmp_fields-- > 6)
910 if(count == 0 || i+count > 256){
911 av_log(s, AV_LOG_ERROR, "illegal count %d at %d\n", count, i);
914 if(tmp_stream > nut->stream_count + 1){
915 av_log(s, AV_LOG_ERROR, "illegal stream number\n");
919 for(j=0; j<count; j++,i++){
920 nut->frame_code[i].flags = tmp_flags ;
921 nut->frame_code[i].timestamp_delta = tmp_time ;
922 nut->frame_code[i].stream_id_plus1 = tmp_stream;
923 nut->frame_code[i].size_mul = tmp_mul ;
924 nut->frame_code[i].size_lsb = tmp_size+j;
925 nut->frame_code[i].reserved_count = tmp_res ;
928 if(nut->frame_code['N'].flags != FLAG_INVALID){
929 av_log(s, AV_LOG_ERROR, "illegal frame_code table\n");
933 if(check_checksum(bc)){
934 av_log(s, AV_LOG_ERROR, "Main header checksum mismatch\n");
941 static int decode_stream_header(NUTContext *nut){
942 AVFormatContext *s= nut->avf;
943 ByteIOContext *bc = &s->pb;
944 int class, nom, denom, stream_id;
948 get_packetheader(nut, bc, 1);
949 stream_id= get_v(bc);
950 if(stream_id >= nut->stream_count || s->streams[stream_id])
953 st = av_new_stream(s, stream_id);
955 return AVERROR_NOMEM;
959 st->codec->codec_tag= tmp;
963 st->codec->codec_type = CODEC_TYPE_VIDEO;
964 st->codec->codec_id = codec_get_bmp_id(tmp);
965 if (st->codec->codec_id == CODEC_ID_NONE)
966 av_log(s, AV_LOG_ERROR, "Unknown codec?!\n");
969 case 32: //compatibility
970 st->codec->codec_type = CODEC_TYPE_AUDIO;
971 st->codec->codec_id = codec_get_wav_id(tmp);
972 if (st->codec->codec_id == CODEC_ID_NONE)
973 av_log(s, AV_LOG_ERROR, "Unknown codec?!\n");
976 // st->codec->codec_type = CODEC_TYPE_TEXT;
979 st->codec->codec_type = CODEC_TYPE_DATA;
982 av_log(s, AV_LOG_ERROR, "Unknown stream class (%d)\n", class);
985 s->bit_rate += get_v(bc);
986 get_vb(bc); /* language code */
989 nut->stream[stream_id].msb_timestamp_shift = get_v(bc);
990 st->codec->has_b_frames=
991 nut->stream[stream_id].decode_delay= get_v(bc);
992 get_byte(bc); /* flags */
994 /* codec specific data headers */
995 while(get_v(bc) != 0){
996 st->codec->extradata_size= get_v(bc);
997 if((unsigned)st->codec->extradata_size > (1<<30))
999 st->codec->extradata= av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
1000 get_buffer(bc, st->codec->extradata, st->codec->extradata_size);
1001 // url_fskip(bc, get_v(bc));
1004 if (st->codec->codec_type == CODEC_TYPE_VIDEO) /* VIDEO */
1006 st->codec->width = get_v(bc);
1007 st->codec->height = get_v(bc);
1008 st->codec->sample_aspect_ratio.num= get_v(bc);
1009 st->codec->sample_aspect_ratio.den= get_v(bc);
1010 get_v(bc); /* csp type */
1012 if (st->codec->codec_type == CODEC_TYPE_AUDIO) /* AUDIO */
1014 st->codec->sample_rate = get_v(bc);
1015 get_v(bc); // samplerate_den
1016 st->codec->channels = get_v(bc);
1018 if(check_checksum(bc)){
1019 av_log(s, AV_LOG_ERROR, "Stream header %d checksum mismatch\n", stream_id);
1022 av_set_pts_info(s->streams[stream_id], 60, denom, nom);
1023 nut->stream[stream_id].rate_num= nom;
1024 nut->stream[stream_id].rate_den= denom;
1028 static int decode_info_header(NUTContext *nut){
1029 AVFormatContext *s= nut->avf;
1030 ByteIOContext *bc = &s->pb;
1032 get_packetheader(nut, bc, 1);
1036 char *name, *type, custom_name[256], custom_type[256];
1040 else if(id >= sizeof(info_table)/sizeof(info_table[0])){
1041 av_log(s, AV_LOG_ERROR, "info id is too large %d %zd\n", id, sizeof(info_table)/sizeof(info_table[0]));
1045 type= info_table[id][1];
1046 name= info_table[id][0];
1047 //av_log(s, AV_LOG_DEBUG, "%d %s %s\n", id, type, name);
1050 get_str(bc, custom_type, sizeof(custom_type));
1054 get_str(bc, custom_name, sizeof(custom_name));
1058 if(!strcmp(type, "v")){
1061 if(!strcmp(name, "Author"))
1062 get_str(bc, s->author, sizeof(s->author));
1063 else if(!strcmp(name, "Title"))
1064 get_str(bc, s->title, sizeof(s->title));
1065 else if(!strcmp(name, "Copyright"))
1066 get_str(bc, s->copyright, sizeof(s->copyright));
1067 else if(!strcmp(name, "Description"))
1068 get_str(bc, s->comment, sizeof(s->comment));
1070 get_str(bc, NULL, 0);
1073 if(check_checksum(bc)){
1074 av_log(s, AV_LOG_ERROR, "Info header checksum mismatch\n");
1080 static int nut_read_header(AVFormatContext *s, AVFormatParameters *ap)
1082 NUTContext *nut = s->priv_data;
1083 ByteIOContext *bc = &s->pb;
1085 int inited_stream_count;
1092 pos= find_startcode(bc, MAIN_STARTCODE, pos)+1;
1094 av_log(s, AV_LOG_ERROR, "no main startcode found\n");
1097 if(decode_main_header(nut) >= 0)
1104 nut->stream = av_malloc(sizeof(StreamContext)*nut->stream_count);
1106 /* stream headers */
1108 for(inited_stream_count=0; inited_stream_count < nut->stream_count;){
1109 pos= find_startcode(bc, STREAM_STARTCODE, pos)+1;
1111 av_log(s, AV_LOG_ERROR, "not all stream headers found\n");
1114 if(decode_stream_header(nut) >= 0)
1115 inited_stream_count++;
1121 uint64_t startcode= find_any_startcode(bc, pos);
1125 av_log(s, AV_LOG_ERROR, "EOF before video frames\n");
1127 }else if(startcode == KEYFRAME_STARTCODE){
1128 nut->next_startcode= startcode;
1130 }else if(startcode != INFO_STARTCODE){
1134 decode_info_header(nut);
1140 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){
1141 AVFormatContext *s= nut->avf;
1142 StreamContext *stream;
1143 ByteIOContext *bc = &s->pb;
1144 int size, flags, size_mul, size_lsb, stream_id, time_delta;
1147 if(frame_type < 2 && frame_start - nut->packet_start[2] > nut->max_distance){
1148 av_log(s, AV_LOG_ERROR, "last frame must have been damaged\n");
1153 nut->packet_start[ frame_type ]= frame_start; //otherwise 1 goto 1 may happen
1155 flags= nut->frame_code[frame_code].flags;
1156 size_mul= nut->frame_code[frame_code].size_mul;
1157 size_lsb= nut->frame_code[frame_code].size_lsb;
1158 stream_id= nut->frame_code[frame_code].stream_id_plus1 - 1;
1159 time_delta= nut->frame_code[frame_code].timestamp_delta;
1162 stream_id= get_v(bc);
1163 if(stream_id >= s->nb_streams){
1164 av_log(s, AV_LOG_ERROR, "illegal stream_id\n");
1167 stream= &nut->stream[stream_id];
1169 // 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]);
1171 *key_frame_ret= !!(flags & FLAG_KEY_FRAME);
1174 int64_t mask = (1<<stream->msb_timestamp_shift)-1;
1179 if(stream->last_pts == AV_NOPTS_VALUE){
1180 av_log(s, AV_LOG_ERROR, "no reference pts available\n");
1183 pts= lsb2full(stream, pts);
1186 if(stream->last_pts == AV_NOPTS_VALUE){
1187 av_log(s, AV_LOG_ERROR, "no reference pts available\n");
1190 pts= stream->last_pts + time_delta;
1194 // 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);
1196 s->streams[stream_id],
1200 frame_start - nut->stream[stream_id].last_sync_pos,
1202 nut->stream[stream_id].last_sync_pos= frame_start;
1203 // assert(nut->packet_start == frame_start);
1206 assert(size_mul > size_lsb);
1208 if(flags & FLAG_DATA_SIZE)
1209 size+= size_mul*get_v(bc);
1212 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);
1215 if(frame_type==0 && url_ftell(bc) - nut->packet_start[2] + size > nut->max_distance){
1216 av_log(s, AV_LOG_ERROR, "frame size too large\n");
1220 *stream_id_ret = stream_id;
1223 update(nut, stream_id, frame_start, frame_type, frame_code, *key_frame_ret, size, pts);
1228 static int decode_frame(NUTContext *nut, AVPacket *pkt, int frame_code, int frame_type, int64_t frame_start){
1229 AVFormatContext *s= nut->avf;
1230 ByteIOContext *bc = &s->pb;
1231 int size, stream_id, key_frame, discard;
1232 int64_t pts, last_IP_pts;
1234 size= decode_frame_header(nut, &key_frame, &pts, &stream_id, frame_code, frame_type, frame_start);
1238 discard= s->streams[ stream_id ]->discard;
1239 last_IP_pts= s->streams[ stream_id ]->last_IP_pts;
1240 if( (discard >= AVDISCARD_NONKEY && !key_frame)
1241 ||(discard >= AVDISCARD_BIDIR && last_IP_pts != AV_NOPTS_VALUE && last_IP_pts > pts)
1242 || discard >= AVDISCARD_ALL){
1243 url_fskip(bc, size);
1247 av_get_packet(bc, pkt, size);
1248 pkt->stream_index = stream_id;
1250 pkt->flags |= PKT_FLAG_KEY;
1256 static int nut_read_packet(AVFormatContext *s, AVPacket *pkt)
1258 NUTContext *nut = s->priv_data;
1259 ByteIOContext *bc = &s->pb;
1260 int i, frame_code=0, ret;
1263 int64_t pos= url_ftell(bc);
1265 uint64_t tmp= nut->next_startcode;
1266 nut->next_startcode=0;
1274 frame_code = get_byte(bc);
1275 if(frame_code == 'N'){
1278 tmp = (tmp<<8) + get_byte(bc);
1282 case MAIN_STARTCODE:
1283 case STREAM_STARTCODE:
1284 case INDEX_STARTCODE:
1285 get_packetheader(nut, bc, 0);
1286 assert(nut->packet_start[2] == pos);
1287 url_fseek(bc, nut->written_packet_size, SEEK_CUR);
1289 case INFO_STARTCODE:
1290 if(decode_info_header(nut)<0)
1293 case KEYFRAME_STARTCODE:
1295 reset(s, get_v(bc));
1296 frame_code = get_byte(bc);
1298 ret= decode_frame(nut, pkt, frame_code, frame_type, pos);
1301 else if(ret==1) //ok but discard packet
1305 av_log(s, AV_LOG_DEBUG, "syncing from %"PRId64"\n", nut->packet_start[2]+1);
1306 tmp= find_any_startcode(bc, nut->packet_start[2]+1);
1309 av_log(s, AV_LOG_DEBUG, "sync\n");
1310 nut->next_startcode= tmp;
1315 static int64_t nut_read_timestamp(AVFormatContext *s, int stream_index, int64_t *pos_arg, int64_t pos_limit){
1316 NUTContext *nut = s->priv_data;
1317 StreamContext *stream;
1318 ByteIOContext *bc = &s->pb;
1321 int frame_code,step, stream_id, i,size, key_frame;
1322 av_log(s, AV_LOG_DEBUG, "read_timestamp(X,%d,%"PRId64",%"PRId64")\n", stream_index, *pos_arg, pos_limit);
1325 return AV_NOPTS_VALUE;
1328 step= FFMIN(16*1024, pos);
1331 code= find_any_startcode(bc, pos);
1333 if(code && url_ftell(bc) - 8 <= *pos_arg)
1335 step= FFMIN(2*step, pos);
1338 if(!code) //nothing found, not even after pos_arg
1339 return AV_NOPTS_VALUE;
1341 url_fseek(bc, -8, SEEK_CUR);
1342 for(i=0; i<s->nb_streams; i++)
1343 nut->stream[i].last_sync_pos= url_ftell(bc);
1347 int64_t pos= url_ftell(bc);
1350 if(pos > pos_limit || url_feof(bc))
1351 return AV_NOPTS_VALUE;
1353 frame_code = get_byte(bc);
1354 if(frame_code == 'N'){
1357 tmp = (tmp<<8) + get_byte(bc);
1359 //av_log(s, AV_LOG_DEBUG, "before switch %llX at=%lld\n", tmp, pos);
1362 case MAIN_STARTCODE:
1363 case STREAM_STARTCODE:
1364 case INDEX_STARTCODE:
1365 case INFO_STARTCODE:
1366 get_packetheader(nut, bc, 0);
1367 assert(nut->packet_start[2]==pos);
1368 url_fseek(bc, nut->written_packet_size, SEEK_CUR);
1370 case KEYFRAME_STARTCODE:
1372 reset(s, get_v(bc));
1373 frame_code = get_byte(bc);
1375 size= decode_frame_header(nut, &key_frame, &pts, &stream_id, frame_code, frame_type, pos);
1379 stream= &nut->stream[stream_id];
1380 if(stream_id != stream_index || !key_frame || pos < *pos_arg){
1381 url_fseek(bc, size, SEEK_CUR);
1389 av_log(s, AV_LOG_DEBUG, "syncing from %"PRId64"\n", nut->packet_start[2]+1);
1390 if(!find_any_startcode(bc, nut->packet_start[2]+1))
1391 return AV_NOPTS_VALUE;
1393 url_fseek(bc, -8, SEEK_CUR);
1396 return AV_NOPTS_VALUE;
1399 static int nut_read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags){
1400 // NUTContext *nut = s->priv_data;
1403 if(av_seek_frame_binary(s, stream_index, target_ts, flags) < 0)
1406 pos= url_ftell(&s->pb);
1407 nut_read_timestamp(s, stream_index, &pos, pos-1);
1412 static int nut_read_close(AVFormatContext *s)
1414 NUTContext *nut = s->priv_data;
1416 av_freep(&nut->stream);
1421 #ifdef CONFIG_NUT_DEMUXER
1422 AVInputFormat nut_demuxer = {
1432 .extensions = "nut",
1435 #ifdef CONFIG_NUT_MUXER
1436 AVOutputFormat nut_muxer = {
1442 #ifdef CONFIG_LIBVORBIS
1444 #elif defined(CONFIG_MP3LAME)
1447 CODEC_ID_MP2, /* AC3 needs liba52 decoder */
1453 .flags = AVFMT_GLOBALHEADER,