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"
45 #define MAIN_STARTCODE (0x7A561F5F04ADULL + (((uint64_t)('N'<<8) + 'M')<<48))
46 #define STREAM_STARTCODE (0x11405BF2F9DBULL + (((uint64_t)('N'<<8) + 'S')<<48))
47 #define KEYFRAME_STARTCODE (0xE4ADEECA4569ULL + (((uint64_t)('N'<<8) + 'K')<<48))
48 #define INDEX_STARTCODE (0xDD672F23E64EULL + (((uint64_t)('N'<<8) + 'X')<<48))
49 #define INFO_STARTCODE (0xAB68B596BA78ULL + (((uint64_t)('N'<<8) + 'I')<<48))
51 #define ID_STRING "nut/multimedia container\0"
53 #define MAX_DISTANCE (1024*16-1)
54 #define MAX_SHORT_DISTANCE (1024*4-1)
56 #define FLAG_DATA_SIZE 1
57 #define FLAG_KEY_FRAME 2
58 #define FLAG_INVALID 4
62 uint8_t stream_id_plus1;
65 int16_t timestamp_delta;
66 uint8_t reserved_count;
71 int msb_timestamp_shift;
75 int64_t last_sync_pos; ///<pos of last 1/2 type frame
81 int written_packet_size;
82 int64_t packet_start[3]; //0-> startcode less, 1-> short startcode 2-> long startcodes
83 FrameCode frame_code[256];
84 unsigned int stream_count;
85 uint64_t next_startcode; ///< stores the next startcode if it has alraedy been parsed but the stream isnt seekable
86 StreamContext *stream;
88 int max_short_distance;
94 static char *info_table[][2]={
95 {NULL , NULL }, // end
102 {"StartTimestamp" , "v"},
103 {"EndTimestamp" , "v"},
106 {"Description" , "UTF8"},
107 {"Copyright" , "UTF8"},
108 {"Encoder" , "UTF8"},
109 {"Keyword" , "UTF8"},
114 void ff_parse_specific_params(AVCodecContext *stream, int *au_rate, int *au_ssize, int *au_scale);
116 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){
117 StreamContext *stream= &nut->stream[stream_index];
119 stream->last_key_frame= key_frame;
120 nut->packet_start[ frame_type ]= frame_start;
121 stream->last_pts= pts;
124 static void reset(AVFormatContext *s, int64_t global_ts){
125 NUTContext *nut = s->priv_data;
128 for(i=0; i<s->nb_streams; i++){
129 StreamContext *stream= &nut->stream[i];
131 stream->last_key_frame= 1;
133 stream->last_pts= av_rescale(global_ts, stream->rate_num*(int64_t)nut->rate_den, stream->rate_den*(int64_t)nut->rate_num);
137 static void build_frame_code(AVFormatContext *s){
138 NUTContext *nut = s->priv_data;
139 int key_frame, index, pred, stream_id;
142 int keyframe_0_esc= s->nb_streams > 2;
146 /* keyframe = 0 escape */
147 FrameCode *ft= &nut->frame_code[start];
148 ft->flags= FLAG_DATA_SIZE;
149 ft->stream_id_plus1= 0;
151 ft->timestamp_delta=0;
155 for(stream_id= 0; stream_id<s->nb_streams; stream_id++){
156 int start2= start + (end-start)*stream_id / s->nb_streams;
157 int end2 = start + (end-start)*(stream_id+1) / s->nb_streams;
158 AVCodecContext *codec = s->streams[stream_id]->codec;
159 int is_audio= codec->codec_type == CODEC_TYPE_AUDIO;
160 int intra_only= /*codec->intra_only || */is_audio;
163 for(key_frame=0; key_frame<2; key_frame++){
164 if(intra_only && keyframe_0_esc && key_frame==0)
168 FrameCode *ft= &nut->frame_code[start2];
169 ft->flags= FLAG_KEY_FRAME*key_frame;
170 ft->flags|= FLAG_DATA_SIZE;
171 ft->stream_id_plus1= stream_id + 1;
173 ft->timestamp_delta=0;
178 key_frame= intra_only;
181 int frame_bytes= codec->frame_size*(int64_t)codec->bit_rate / (8*codec->sample_rate);
183 for(pts=0; pts<2; pts++){
184 for(pred=0; pred<2; pred++){
185 FrameCode *ft= &nut->frame_code[start2];
186 ft->flags= FLAG_KEY_FRAME*key_frame;
187 ft->stream_id_plus1= stream_id + 1;
188 ft->size_mul=frame_bytes + 2;
189 ft->size_lsb=frame_bytes + pred;
190 ft->timestamp_delta=pts;
195 FrameCode *ft= &nut->frame_code[start2];
196 ft->flags= FLAG_KEY_FRAME | FLAG_DATA_SIZE;
197 ft->stream_id_plus1= stream_id + 1;
199 ft->timestamp_delta=1;
204 if(codec->has_b_frames){
211 }else if(codec->codec_id == CODEC_ID_VORBIS){
221 for(pred=0; pred<pred_count; pred++){
222 int start3= start2 + (end2-start2)*pred / pred_count;
223 int end3 = start2 + (end2-start2)*(pred+1) / pred_count;
225 for(index=start3; index<end3; index++){
226 FrameCode *ft= &nut->frame_code[index];
227 ft->flags= FLAG_KEY_FRAME*key_frame;
228 ft->flags|= FLAG_DATA_SIZE;
229 ft->stream_id_plus1= stream_id + 1;
230 //FIXME use single byte size and pred from last
231 ft->size_mul= end3-start3;
232 ft->size_lsb= index - start3;
233 ft->timestamp_delta= pred_table[pred];
237 memmove(&nut->frame_code['N'+1], &nut->frame_code['N'], sizeof(FrameCode)*(255-'N'));
238 nut->frame_code['N'].flags= FLAG_INVALID;
241 static uint64_t get_v(ByteIOContext *bc)
247 int tmp = get_byte(bc);
250 val= (val<<7) + tmp - 0x80;
252 //av_log(NULL, AV_LOG_DEBUG, "get_v()= %lld\n", (val<<7) + tmp);
253 return (val<<7) + tmp;
259 static int get_str(ByteIOContext *bc, char *string, unsigned int maxlen){
260 unsigned int len= get_v(bc);
263 get_buffer(bc, string, FFMIN(len, maxlen));
270 string[FFMIN(len, maxlen-1)]= 0;
278 static int64_t get_s(ByteIOContext *bc){
279 int64_t v = get_v(bc) + 1;
281 if (v&1) return -(v>>1);
285 static uint64_t get_vb(ByteIOContext *bc){
287 unsigned int i= get_v(bc);
293 val = (val<<8) + get_byte(bc);
295 //av_log(NULL, AV_LOG_DEBUG, "get_vb()= %lld\n", val);
300 static inline uint64_t get_v_trace(ByteIOContext *bc, char *file, char *func, int line){
301 uint64_t v= get_v(bc);
303 printf("get_v %5lld / %llX in %s %s:%d\n", v, v, file, func, line);
307 static inline int64_t get_s_trace(ByteIOContext *bc, char *file, char *func, int line){
308 int64_t v= get_s(bc);
310 printf("get_s %5lld / %llX in %s %s:%d\n", v, v, file, func, line);
314 static inline uint64_t get_vb_trace(ByteIOContext *bc, char *file, char *func, int line){
315 uint64_t v= get_vb(bc);
317 printf("get_vb %5lld / %llX in %s %s:%d\n", v, v, file, func, line);
320 #define get_v(bc) get_v_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__)
321 #define get_s(bc) get_s_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__)
322 #define get_vb(bc) get_vb_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__)
326 static int get_packetheader(NUTContext *nut, ByteIOContext *bc, int calculate_checksum)
329 start= url_ftell(bc) - 8;
333 init_checksum(bc, calculate_checksum ? update_adler32 : NULL, 0);
335 nut->packet_start[2] = start;
336 nut->written_packet_size= size;
341 static int check_checksum(ByteIOContext *bc){
342 unsigned long checksum= get_checksum(bc);
343 return checksum != get_be32(bc);
349 static int get_length(uint64_t val){
352 for (i=7; val>>i; i+=7);
357 static uint64_t find_any_startcode(ByteIOContext *bc, int64_t pos){
361 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
363 while(!url_feof(bc)){
364 state= (state<<8) | get_byte(bc);
365 if((state>>56) != 'N')
369 case STREAM_STARTCODE:
370 case KEYFRAME_STARTCODE:
372 case INDEX_STARTCODE:
381 * find the given startcode.
382 * @param code the startcode
383 * @param pos the start position of the search, or -1 if the current position
384 * @returns the position of the startcode or -1 if not found
386 static int64_t find_startcode(ByteIOContext *bc, uint64_t code, int64_t pos){
388 uint64_t startcode= find_any_startcode(bc, pos);
389 if(startcode == code)
390 return url_ftell(bc) - 8;
391 else if(startcode == 0)
397 static int64_t lsb2full(StreamContext *stream, int64_t lsb){
398 int64_t mask = (1<<stream->msb_timestamp_shift)-1;
399 int64_t delta= stream->last_pts - mask/2;
400 return ((lsb - delta)&mask) + delta;
405 static void put_v(ByteIOContext *bc, uint64_t val)
409 //av_log(NULL, AV_LOG_DEBUG, "put_v()= %lld\n", val);
410 val &= 0x7FFFFFFFFFFFFFFFULL; // FIXME can only encode upto 63 bits currently
413 for (i-=7; i>0; i-=7){
414 put_byte(bc, 0x80 | (val>>i));
417 put_byte(bc, val&0x7f);
421 * stores a string as vb.
423 static void put_str(ByteIOContext *bc, const char *string){
424 int len= strlen(string);
427 put_buffer(bc, string, len);
430 static void put_s(ByteIOContext *bc, int64_t val){
431 if (val<=0) put_v(bc, -2*val );
432 else put_v(bc, 2*val-1);
435 static void put_vb(ByteIOContext *bc, uint64_t val){
438 for (i=8; val>>i; i+=8);
441 for(i-=8; i>=0; i-=8)
442 put_byte(bc, (val>>i)&0xFF);
446 static inline void put_v_trace(ByteIOContext *bc, uint64_t v, char *file, char *func, int line){
447 printf("get_v %5lld / %llX in %s %s:%d\n", v, v, file, func, line);
452 static inline void put_s_trace(ByteIOContext *bc, int64_t v, char *file, char *func, int line){
453 printf("get_s %5lld / %llX in %s %s:%d\n", v, v, file, func, line);
458 static inline void put_vb_trace(ByteIOContext *bc, uint64_t v, char *file, char *func, int line){
459 printf("get_vb %5lld / %llX in %s %s:%d\n", v, v, file, func, line);
463 #define put_v(bc, v) put_v_trace(bc, v, __FILE__, __PRETTY_FUNCTION__, __LINE__)
464 #define put_s(bc, v) put_s_trace(bc, v, __FILE__, __PRETTY_FUNCTION__, __LINE__)
465 #define put_vb(bc, v) put_vb_trace(bc, v, __FILE__, __PRETTY_FUNCTION__, __LINE__)
468 static int put_packetheader(NUTContext *nut, ByteIOContext *bc, int max_size, int calculate_checksum)
470 put_flush_packet(bc);
471 nut->packet_start[2]= url_ftell(bc) - 8;
472 nut->written_packet_size = max_size;
475 put_v(bc, nut->written_packet_size); /* forward ptr */
477 if(calculate_checksum)
478 init_checksum(bc, update_adler32, 0);
485 * must not be called more then once per packet
487 static int update_packetheader(NUTContext *nut, ByteIOContext *bc, int additional_size, int calculate_checksum){
488 int64_t start= nut->packet_start[2];
489 int64_t cur= url_ftell(bc);
490 int size= cur - start - get_length(nut->written_packet_size)/7 - 8;
492 if(calculate_checksum)
495 if(size != nut->written_packet_size){
498 assert( size <= nut->written_packet_size );
500 url_fseek(bc, start + 8, SEEK_SET);
501 for(i=get_length(size); i < get_length(nut->written_packet_size); i+=7)
505 url_fseek(bc, cur, SEEK_SET);
506 nut->written_packet_size= size; //FIXME may fail if multiple updates with differing sizes, as get_length may differ
508 if(calculate_checksum)
509 put_be32(bc, get_checksum(bc));
515 static int nut_write_header(AVFormatContext *s)
517 NUTContext *nut = s->priv_data;
518 ByteIOContext *bc = &s->pb;
519 AVCodecContext *codec;
520 int i, j, tmp_time, tmp_flags,tmp_stream, tmp_mul, tmp_size, tmp_fields;
525 av_mallocz(sizeof(StreamContext)*s->nb_streams);
528 put_buffer(bc, ID_STRING, strlen(ID_STRING));
530 nut->packet_start[2]= url_ftell(bc);
533 put_be64(bc, MAIN_STARTCODE);
534 put_packetheader(nut, bc, 120+5*256, 1);
535 put_v(bc, 2); /* version */
536 put_v(bc, s->nb_streams);
537 put_v(bc, MAX_DISTANCE);
538 put_v(bc, MAX_SHORT_DISTANCE);
540 put_v(bc, nut->rate_num=1);
541 put_v(bc, nut->rate_den=2);
542 put_v(bc, nut->short_startcode=0x4EFE79);
545 assert(nut->frame_code['N'].flags == FLAG_INVALID);
547 tmp_time= tmp_flags= tmp_stream= tmp_mul= tmp_size= /*tmp_res=*/ INT_MAX;
551 if(tmp_time != nut->frame_code[i].timestamp_delta) tmp_fields=1;
552 if(tmp_mul != nut->frame_code[i].size_mul ) tmp_fields=2;
553 if(tmp_stream != nut->frame_code[i].stream_id_plus1) tmp_fields=3;
554 if(tmp_size != nut->frame_code[i].size_lsb ) tmp_fields=4;
555 // if(tmp_res != nut->frame_code[i].res ) tmp_fields=5;
557 tmp_time = nut->frame_code[i].timestamp_delta;
558 tmp_flags = nut->frame_code[i].flags;
559 tmp_stream= nut->frame_code[i].stream_id_plus1;
560 tmp_mul = nut->frame_code[i].size_mul;
561 tmp_size = nut->frame_code[i].size_lsb;
562 // tmp_res = nut->frame_code[i].res;
564 for(j=0; i<256; j++,i++){
565 if(nut->frame_code[i].timestamp_delta != tmp_time ) break;
566 if(nut->frame_code[i].flags != tmp_flags ) break;
567 if(nut->frame_code[i].stream_id_plus1 != tmp_stream) break;
568 if(nut->frame_code[i].size_mul != tmp_mul ) break;
569 if(nut->frame_code[i].size_lsb != tmp_size+j) break;
570 // if(nut->frame_code[i].res != tmp_res ) break;
572 if(j != tmp_mul - tmp_size) tmp_fields=6;
574 put_v(bc, tmp_flags);
575 put_v(bc, tmp_fields);
576 if(tmp_fields>0) put_s(bc, tmp_time);
577 if(tmp_fields>1) put_v(bc, tmp_mul);
578 if(tmp_fields>2) put_v(bc, tmp_stream);
579 if(tmp_fields>3) put_v(bc, tmp_size);
580 if(tmp_fields>4) put_v(bc, 0 /*tmp_res*/);
581 if(tmp_fields>5) put_v(bc, j);
584 update_packetheader(nut, bc, 0, 1);
587 for (i = 0; i < s->nb_streams; i++)
589 int nom, denom, ssize;
591 codec = s->streams[i]->codec;
593 put_be64(bc, STREAM_STARTCODE);
594 put_packetheader(nut, bc, 120 + codec->extradata_size, 1);
595 put_v(bc, i /*s->streams[i]->index*/);
596 switch(codec->codec_type){
597 case CODEC_TYPE_VIDEO: put_v(bc, 0); break;
598 case CODEC_TYPE_AUDIO: put_v(bc, 1); break;
599 // case CODEC_TYPE_TEXT : put_v(bc, 2); break;
600 case CODEC_TYPE_DATA : put_v(bc, 3); break;
603 if (codec->codec_tag)
604 put_vb(bc, codec->codec_tag);
605 else if (codec->codec_type == CODEC_TYPE_VIDEO)
607 put_vb(bc, codec_get_bmp_tag(codec->codec_id));
609 else if (codec->codec_type == CODEC_TYPE_AUDIO)
611 put_vb(bc, codec_get_wav_tag(codec->codec_id));
616 ff_parse_specific_params(codec, &nom, &ssize, &denom);
618 nut->stream[i].rate_num= nom;
619 nut->stream[i].rate_den= denom;
620 av_set_pts_info(s->streams[i], 60, denom, nom);
622 put_v(bc, codec->bit_rate);
623 put_vb(bc, 0); /* no language code */
626 if(nom / denom < 1000)
627 nut->stream[i].msb_timestamp_shift = 7;
629 nut->stream[i].msb_timestamp_shift = 14;
630 put_v(bc, nut->stream[i].msb_timestamp_shift);
631 put_v(bc, codec->has_b_frames);
632 put_byte(bc, 0); /* flags: 0x1 - fixed_fps, 0x2 - index_present */
634 if(codec->extradata_size){
636 put_v(bc, codec->extradata_size);
637 put_buffer(bc, codec->extradata, codec->extradata_size);
639 put_v(bc, 0); /* end of codec specific headers */
641 switch(codec->codec_type)
643 case CODEC_TYPE_AUDIO:
644 put_v(bc, codec->sample_rate);
646 put_v(bc, codec->channels);
648 case CODEC_TYPE_VIDEO:
649 put_v(bc, codec->width);
650 put_v(bc, codec->height);
651 put_v(bc, codec->sample_aspect_ratio.num);
652 put_v(bc, codec->sample_aspect_ratio.den);
653 put_v(bc, 0); /* csp type -- unknown */
658 update_packetheader(nut, bc, 0, 1);
662 put_be64(bc, INFO_STARTCODE);
663 put_packetheader(nut, bc, 30+strlen(s->author)+strlen(s->title)+
664 strlen(s->comment)+strlen(s->copyright)+strlen(LIBAVFORMAT_IDENT), 1);
667 put_v(bc, 9); /* type */
668 put_str(bc, s->author);
672 put_v(bc, 10); /* type */
673 put_str(bc, s->title);
677 put_v(bc, 11); /* type */
678 put_str(bc, s->comment);
682 put_v(bc, 12); /* type */
683 put_str(bc, s->copyright);
686 if(!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT)){
687 put_v(bc, 13); /* type */
688 put_str(bc, LIBAVFORMAT_IDENT);
691 put_v(bc, 0); /* eof info */
692 update_packetheader(nut, bc, 0, 1);
694 put_flush_packet(bc);
699 static int nut_write_packet(AVFormatContext *s, AVPacket *pkt)
701 NUTContext *nut = s->priv_data;
702 StreamContext *stream= &nut->stream[pkt->stream_index];
703 ByteIOContext *bc = &s->pb;
704 int key_frame = 0, full_pts=0;
707 int frame_type, best_length, frame_code, flags, i, size_mul, size_lsb, time_delta;
708 const int64_t frame_start= url_ftell(bc);
709 int64_t pts= pkt->pts;
711 int stream_index= pkt->stream_index;
713 enc = s->streams[stream_index]->codec;
714 key_frame = !!(pkt->flags & PKT_FLAG_KEY);
717 if(frame_start + size + 20 - FFMAX(nut->packet_start[1], nut->packet_start[2]) > MAX_DISTANCE)
719 if(key_frame && !stream->last_key_frame)
723 int64_t global_ts= av_rescale(pts, stream->rate_den*(int64_t)nut->rate_num, stream->rate_num*(int64_t)nut->rate_den);
725 put_be64(bc, KEYFRAME_STARTCODE);
726 put_v(bc, global_ts);
728 assert(stream->last_pts != AV_NOPTS_VALUE);
729 coded_pts = pts & ((1<<stream->msb_timestamp_shift)-1);
730 if(lsb2full(stream, coded_pts) != pts)
734 coded_pts= pts + (1<<stream->msb_timestamp_shift);
738 for(i=0; i<256; i++){
739 int stream_id_plus1= nut->frame_code[i].stream_id_plus1;
742 size_mul= nut->frame_code[i].size_mul;
743 size_lsb= nut->frame_code[i].size_lsb;
744 time_delta= nut->frame_code[i].timestamp_delta;
745 flags= nut->frame_code[i].flags;
747 assert(size_mul > size_lsb);
749 if(stream_id_plus1 == 0) length+= get_length(stream_index);
750 else if(stream_id_plus1 - 1 != stream_index)
752 fc_key_frame= !!(flags & FLAG_KEY_FRAME);
754 assert(key_frame==0 || key_frame==1);
755 if(fc_key_frame != key_frame)
758 if(flags & FLAG_DATA_SIZE){
759 if(size % size_mul != size_lsb)
761 length += get_length(size / size_mul);
762 }else if(size != size_lsb)
765 if(full_pts && time_delta)
769 length += get_length(coded_pts);
771 if(time_delta != pts - stream->last_pts)
775 if(length < best_length){
779 // 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);
782 assert(frame_code != -1);
783 flags= nut->frame_code[frame_code].flags;
784 size_mul= nut->frame_code[frame_code].size_mul;
785 size_lsb= nut->frame_code[frame_code].size_lsb;
786 time_delta= nut->frame_code[frame_code].timestamp_delta;
789 best_length ++; //frame_code
791 best_length += 8; // startcode
793 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);
794 // 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]);
797 assert(frame_type != 1); //short startcode not implemented yet
798 put_byte(bc, frame_code);
800 if(nut->frame_code[frame_code].stream_id_plus1 == 0)
801 put_v(bc, stream_index);
803 put_v(bc, coded_pts);
805 if(flags & FLAG_DATA_SIZE)
806 put_v(bc, size / size_mul);
808 assert(size == size_lsb);
809 if(size > MAX_DISTANCE){
810 assert(frame_type > 1);
813 put_buffer(bc, pkt->data, size);
815 update(nut, stream_index, frame_start, frame_type, frame_code, key_frame, size, pts);
820 static int nut_write_trailer(AVFormatContext *s)
822 NUTContext *nut = s->priv_data;
823 ByteIOContext *bc = &s->pb;
830 for (i = 0; s->nb_streams; i++)
832 put_be64(bc, INDEX_STARTCODE);
833 put_packetheader(nut, bc, 64, 1);
834 put_v(bc, s->streams[i]->id);
836 update_packetheader(nut, bc, 0, 1);
840 put_flush_packet(bc);
842 av_freep(&nut->stream);
846 #endif //CONFIG_MUXERS
848 static int nut_probe(AVProbeData *p)
853 for (i = 0; i < p->buf_size; i++) {
854 code = (code << 8) | p->buf[i];
855 if (code == MAIN_STARTCODE)
856 return AVPROBE_SCORE_MAX;
861 static int decode_main_header(NUTContext *nut){
862 AVFormatContext *s= nut->avf;
863 ByteIOContext *bc = &s->pb;
865 int i, j, tmp_stream, tmp_mul, tmp_time, tmp_size, count, tmp_res;
867 get_packetheader(nut, bc, 1);
871 av_log(s, AV_LOG_ERROR, "bad version (%"PRId64")\n", tmp);
875 nut->stream_count = get_v(bc);
876 if(nut->stream_count > MAX_STREAMS){
877 av_log(s, AV_LOG_ERROR, "too many streams\n");
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 mismatch\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 case 32: //compatibility
966 st->codec->codec_type = CODEC_TYPE_AUDIO;
967 st->codec->codec_id = codec_get_wav_id(tmp);
968 if (st->codec->codec_id == CODEC_ID_NONE)
969 av_log(s, AV_LOG_ERROR, "Unknown codec?!\n");
972 // st->codec->codec_type = CODEC_TYPE_TEXT;
975 st->codec->codec_type = CODEC_TYPE_DATA;
978 av_log(s, AV_LOG_ERROR, "Unknown stream class (%d)\n", class);
981 s->bit_rate += get_v(bc);
982 get_vb(bc); /* language code */
985 nut->stream[stream_id].msb_timestamp_shift = get_v(bc);
986 st->codec->has_b_frames=
987 nut->stream[stream_id].decode_delay= get_v(bc);
988 get_byte(bc); /* flags */
990 /* codec specific data headers */
991 while(get_v(bc) != 0){
992 st->codec->extradata_size= get_v(bc);
993 if((unsigned)st->codec->extradata_size > (1<<30))
995 st->codec->extradata= av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
996 get_buffer(bc, st->codec->extradata, st->codec->extradata_size);
997 // url_fskip(bc, get_v(bc));
1000 if (st->codec->codec_type == CODEC_TYPE_VIDEO) /* VIDEO */
1002 st->codec->width = get_v(bc);
1003 st->codec->height = get_v(bc);
1004 st->codec->sample_aspect_ratio.num= get_v(bc);
1005 st->codec->sample_aspect_ratio.den= get_v(bc);
1006 get_v(bc); /* csp type */
1008 if (st->codec->codec_type == CODEC_TYPE_AUDIO) /* AUDIO */
1010 st->codec->sample_rate = get_v(bc);
1011 get_v(bc); // samplerate_den
1012 st->codec->channels = get_v(bc);
1014 if(check_checksum(bc)){
1015 av_log(s, AV_LOG_ERROR, "Stream header %d checksum mismatch\n", stream_id);
1018 av_set_pts_info(s->streams[stream_id], 60, denom, nom);
1019 nut->stream[stream_id].rate_num= nom;
1020 nut->stream[stream_id].rate_den= denom;
1024 static int decode_info_header(NUTContext *nut){
1025 AVFormatContext *s= nut->avf;
1026 ByteIOContext *bc = &s->pb;
1028 get_packetheader(nut, bc, 1);
1032 char *name, *type, custom_name[256], custom_type[256];
1036 else if(id >= sizeof(info_table)/sizeof(info_table[0])){
1037 av_log(s, AV_LOG_ERROR, "info id is too large %d %zd\n", id, sizeof(info_table)/sizeof(info_table[0]));
1041 type= info_table[id][1];
1042 name= info_table[id][0];
1043 //av_log(s, AV_LOG_DEBUG, "%d %s %s\n", id, type, name);
1046 get_str(bc, custom_type, sizeof(custom_type));
1050 get_str(bc, custom_name, sizeof(custom_name));
1054 if(!strcmp(type, "v")){
1057 if(!strcmp(name, "Author"))
1058 get_str(bc, s->author, sizeof(s->author));
1059 else if(!strcmp(name, "Title"))
1060 get_str(bc, s->title, sizeof(s->title));
1061 else if(!strcmp(name, "Copyright"))
1062 get_str(bc, s->copyright, sizeof(s->copyright));
1063 else if(!strcmp(name, "Description"))
1064 get_str(bc, s->comment, sizeof(s->comment));
1066 get_str(bc, NULL, 0);
1069 if(check_checksum(bc)){
1070 av_log(s, AV_LOG_ERROR, "Info header checksum mismatch\n");
1076 static int nut_read_header(AVFormatContext *s, AVFormatParameters *ap)
1078 NUTContext *nut = s->priv_data;
1079 ByteIOContext *bc = &s->pb;
1081 int inited_stream_count;
1088 pos= find_startcode(bc, MAIN_STARTCODE, pos)+1;
1090 av_log(s, AV_LOG_ERROR, "no main startcode found\n");
1093 if(decode_main_header(nut) >= 0)
1100 nut->stream = av_malloc(sizeof(StreamContext)*nut->stream_count);
1102 /* stream headers */
1104 for(inited_stream_count=0; inited_stream_count < nut->stream_count;){
1105 pos= find_startcode(bc, STREAM_STARTCODE, pos)+1;
1107 av_log(s, AV_LOG_ERROR, "not all stream headers found\n");
1110 if(decode_stream_header(nut) >= 0)
1111 inited_stream_count++;
1117 uint64_t startcode= find_any_startcode(bc, pos);
1121 av_log(s, AV_LOG_ERROR, "EOF before video frames\n");
1123 }else if(startcode == KEYFRAME_STARTCODE){
1124 nut->next_startcode= startcode;
1126 }else if(startcode != INFO_STARTCODE){
1130 decode_info_header(nut);
1136 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){
1137 AVFormatContext *s= nut->avf;
1138 StreamContext *stream;
1139 ByteIOContext *bc = &s->pb;
1140 int size, flags, size_mul, size_lsb, stream_id, time_delta;
1143 if(frame_type < 2 && frame_start - nut->packet_start[2] > nut->max_distance){
1144 av_log(s, AV_LOG_ERROR, "last frame must have been damaged\n");
1149 nut->packet_start[ frame_type ]= frame_start; //otherwise 1 goto 1 may happen
1151 flags= nut->frame_code[frame_code].flags;
1152 size_mul= nut->frame_code[frame_code].size_mul;
1153 size_lsb= nut->frame_code[frame_code].size_lsb;
1154 stream_id= nut->frame_code[frame_code].stream_id_plus1 - 1;
1155 time_delta= nut->frame_code[frame_code].timestamp_delta;
1158 stream_id= get_v(bc);
1159 if(stream_id >= s->nb_streams){
1160 av_log(s, AV_LOG_ERROR, "illegal stream_id\n");
1163 stream= &nut->stream[stream_id];
1165 // 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]);
1167 *key_frame_ret= !!(flags & FLAG_KEY_FRAME);
1170 int64_t mask = (1<<stream->msb_timestamp_shift)-1;
1175 if(stream->last_pts == AV_NOPTS_VALUE){
1176 av_log(s, AV_LOG_ERROR, "no reference pts available\n");
1179 pts= lsb2full(stream, pts);
1182 if(stream->last_pts == AV_NOPTS_VALUE){
1183 av_log(s, AV_LOG_ERROR, "no reference pts available\n");
1186 pts= stream->last_pts + time_delta;
1190 // 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);
1192 s->streams[stream_id],
1195 frame_start - nut->stream[stream_id].last_sync_pos,
1197 nut->stream[stream_id].last_sync_pos= frame_start;
1198 // assert(nut->packet_start == frame_start);
1201 assert(size_mul > size_lsb);
1203 if(flags & FLAG_DATA_SIZE)
1204 size+= size_mul*get_v(bc);
1207 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);
1210 if(frame_type==0 && url_ftell(bc) - nut->packet_start[2] + size > nut->max_distance){
1211 av_log(s, AV_LOG_ERROR, "frame size too large\n");
1215 *stream_id_ret = stream_id;
1218 update(nut, stream_id, frame_start, frame_type, frame_code, *key_frame_ret, size, pts);
1223 static int decode_frame(NUTContext *nut, AVPacket *pkt, int frame_code, int frame_type, int64_t frame_start){
1224 AVFormatContext *s= nut->avf;
1225 ByteIOContext *bc = &s->pb;
1226 int size, stream_id, key_frame, discard;
1227 int64_t pts, last_IP_pts;
1229 size= decode_frame_header(nut, &key_frame, &pts, &stream_id, frame_code, frame_type, frame_start);
1233 discard= s->streams[ stream_id ]->discard;
1234 last_IP_pts= s->streams[ stream_id ]->last_IP_pts;
1235 if( (discard >= AVDISCARD_NONKEY && !key_frame)
1236 ||(discard >= AVDISCARD_BIDIR && last_IP_pts != AV_NOPTS_VALUE && last_IP_pts > pts)
1237 || discard >= AVDISCARD_ALL){
1238 url_fskip(bc, size);
1242 av_get_packet(bc, pkt, size);
1243 pkt->stream_index = stream_id;
1245 pkt->flags |= PKT_FLAG_KEY;
1251 static int nut_read_packet(AVFormatContext *s, AVPacket *pkt)
1253 NUTContext *nut = s->priv_data;
1254 ByteIOContext *bc = &s->pb;
1255 int i, frame_code=0, ret;
1258 int64_t pos= url_ftell(bc);
1260 uint64_t tmp= nut->next_startcode;
1261 nut->next_startcode=0;
1269 frame_code = get_byte(bc);
1270 if(frame_code == 'N'){
1273 tmp = (tmp<<8) + get_byte(bc);
1277 case MAIN_STARTCODE:
1278 case STREAM_STARTCODE:
1279 case INDEX_STARTCODE:
1280 get_packetheader(nut, bc, 0);
1281 assert(nut->packet_start[2] == pos);
1282 url_fseek(bc, nut->written_packet_size, SEEK_CUR);
1284 case INFO_STARTCODE:
1285 if(decode_info_header(nut)<0)
1288 case KEYFRAME_STARTCODE:
1290 reset(s, get_v(bc));
1291 frame_code = get_byte(bc);
1293 ret= decode_frame(nut, pkt, frame_code, frame_type, pos);
1296 else if(ret==1) //ok but discard packet
1300 av_log(s, AV_LOG_DEBUG, "syncing from %"PRId64"\n", nut->packet_start[2]+1);
1301 tmp= find_any_startcode(bc, nut->packet_start[2]+1);
1304 av_log(s, AV_LOG_DEBUG, "sync\n");
1305 nut->next_startcode= tmp;
1310 static int64_t nut_read_timestamp(AVFormatContext *s, int stream_index, int64_t *pos_arg, int64_t pos_limit){
1311 NUTContext *nut = s->priv_data;
1312 StreamContext *stream;
1313 ByteIOContext *bc = &s->pb;
1316 int frame_code,step, stream_id, i,size, key_frame;
1317 av_log(s, AV_LOG_DEBUG, "read_timestamp(X,%d,%"PRId64",%"PRId64")\n", stream_index, *pos_arg, pos_limit);
1320 return AV_NOPTS_VALUE;
1323 step= FFMIN(16*1024, pos);
1326 code= find_any_startcode(bc, pos);
1328 if(code && url_ftell(bc) - 8 <= *pos_arg)
1330 step= FFMIN(2*step, pos);
1333 if(!code) //nothing found, not even after pos_arg
1334 return AV_NOPTS_VALUE;
1336 url_fseek(bc, -8, SEEK_CUR);
1337 for(i=0; i<s->nb_streams; i++)
1338 nut->stream[i].last_sync_pos= url_ftell(bc);
1342 int64_t pos= url_ftell(bc);
1345 if(pos > pos_limit || url_feof(bc))
1346 return AV_NOPTS_VALUE;
1348 frame_code = get_byte(bc);
1349 if(frame_code == 'N'){
1352 tmp = (tmp<<8) + get_byte(bc);
1354 //av_log(s, AV_LOG_DEBUG, "before switch %llX at=%lld\n", tmp, pos);
1357 case MAIN_STARTCODE:
1358 case STREAM_STARTCODE:
1359 case INDEX_STARTCODE:
1360 case INFO_STARTCODE:
1361 get_packetheader(nut, bc, 0);
1362 assert(nut->packet_start[2]==pos);
1363 url_fseek(bc, nut->written_packet_size, SEEK_CUR);
1365 case KEYFRAME_STARTCODE:
1367 reset(s, get_v(bc));
1368 frame_code = get_byte(bc);
1370 size= decode_frame_header(nut, &key_frame, &pts, &stream_id, frame_code, frame_type, pos);
1374 stream= &nut->stream[stream_id];
1375 if(stream_id != stream_index || !key_frame || pos < *pos_arg){
1376 url_fseek(bc, size, SEEK_CUR);
1384 av_log(s, AV_LOG_DEBUG, "syncing from %"PRId64"\n", nut->packet_start[2]+1);
1385 if(!find_any_startcode(bc, nut->packet_start[2]+1))
1386 return AV_NOPTS_VALUE;
1388 url_fseek(bc, -8, SEEK_CUR);
1391 return AV_NOPTS_VALUE;
1394 static int nut_read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags){
1395 // NUTContext *nut = s->priv_data;
1398 if(av_seek_frame_binary(s, stream_index, target_ts, flags) < 0)
1401 pos= url_ftell(&s->pb);
1402 nut_read_timestamp(s, stream_index, &pos, pos-1);
1407 static int nut_read_close(AVFormatContext *s)
1409 NUTContext *nut = s->priv_data;
1412 for(i=0;i<s->nb_streams;i++) {
1413 av_freep(&s->streams[i]->codec->extradata);
1415 av_freep(&nut->stream);
1420 static AVInputFormat nut_iformat = {
1430 .extensions = "nut",
1433 #ifdef CONFIG_MUXERS
1434 static AVOutputFormat nut_oformat = {
1440 #ifdef CONFIG_LIBVORBIS
1442 #elif defined(CONFIG_MP3LAME)
1445 CODEC_ID_MP2, /* AC3 needs liba52 decoder */
1451 .flags = AVFMT_GLOBALHEADER,
1453 #endif //CONFIG_MUXERS
1457 av_register_input_format(&nut_iformat);
1458 #ifdef CONFIG_MUXERS
1459 av_register_output_format(&nut_oformat);
1460 #endif //CONFIG_MUXERS