3 * Copyright (c) 2004-2007 Michael Niedermayer
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
25 static void build_frame_code(AVFormatContext *s){
26 NUTContext *nut = s->priv_data;
27 int key_frame, index, pred, stream_id;
30 int keyframe_0_esc= s->nb_streams > 2;
34 ft= &nut->frame_code[start];
35 ft->flags= FLAG_CODED;
41 /* keyframe = 0 escape */
42 FrameCode *ft= &nut->frame_code[start];
43 ft->flags= FLAG_STREAM_ID | FLAG_SIZE_MSB | FLAG_CODED_PTS;
48 for(stream_id= 0; stream_id<s->nb_streams; stream_id++){
49 int start2= start + (end-start)*stream_id / s->nb_streams;
50 int end2 = start + (end-start)*(stream_id+1) / s->nb_streams;
51 AVCodecContext *codec = s->streams[stream_id]->codec;
52 int is_audio= codec->codec_type == CODEC_TYPE_AUDIO;
53 int intra_only= /*codec->intra_only || */is_audio;
56 for(key_frame=0; key_frame<2; key_frame++){
57 if(intra_only && keyframe_0_esc && key_frame==0)
61 FrameCode *ft= &nut->frame_code[start2];
62 ft->flags= FLAG_KEY*key_frame;
63 ft->flags|= FLAG_SIZE_MSB | FLAG_CODED_PTS;
64 ft->stream_id= stream_id;
70 key_frame= intra_only;
73 int frame_bytes= codec->frame_size*(int64_t)codec->bit_rate / (8*codec->sample_rate);
75 for(pts=0; pts<2; pts++){
76 for(pred=0; pred<2; pred++){
77 FrameCode *ft= &nut->frame_code[start2];
78 ft->flags= FLAG_KEY*key_frame;
79 ft->stream_id= stream_id;
80 ft->size_mul=frame_bytes + 2;
81 ft->size_lsb=frame_bytes + pred;
87 FrameCode *ft= &nut->frame_code[start2];
88 ft->flags= FLAG_KEY | FLAG_SIZE_MSB;
89 ft->stream_id= stream_id;
96 if(codec->has_b_frames){
103 }else if(codec->codec_id == CODEC_ID_VORBIS){
113 for(pred=0; pred<pred_count; pred++){
114 int start3= start2 + (end2-start2)*pred / pred_count;
115 int end3 = start2 + (end2-start2)*(pred+1) / pred_count;
117 for(index=start3; index<end3; index++){
118 FrameCode *ft= &nut->frame_code[index];
119 ft->flags= FLAG_KEY*key_frame;
120 ft->flags|= FLAG_SIZE_MSB;
121 ft->stream_id= stream_id;
122 //FIXME use single byte size and pred from last
123 ft->size_mul= end3-start3;
124 ft->size_lsb= index - start3;
125 ft->pts_delta= pred_table[pred];
129 memmove(&nut->frame_code['N'+1], &nut->frame_code['N'], sizeof(FrameCode)*(255-'N'));
130 nut->frame_code[ 0].flags=
131 nut->frame_code[255].flags=
132 nut->frame_code['N'].flags= FLAG_INVALID;
136 * Gets the length in bytes which is needed to store val as v.
138 static int get_length(uint64_t val){
147 static void put_v(ByteIOContext *bc, uint64_t val){
148 int i= get_length(val);
151 put_byte(bc, 128 | (val>>(7*i)));
153 put_byte(bc, val&127);
156 static void put_t(NUTContext *nut, StreamContext *nus, ByteIOContext *bc, uint64_t val){
157 val *= nut->time_base_count;
158 val += nus->time_base - nut->time_base;
163 * Stores a string as vb.
165 static void put_str(ByteIOContext *bc, const char *string){
166 int len= strlen(string);
169 put_buffer(bc, string, len);
172 static void put_s(ByteIOContext *bc, int64_t val){
173 put_v(bc, 2*FFABS(val) - (val>0));
177 static inline void put_v_trace(ByteIOContext *bc, uint64_t v, char *file, char *func, int line){
178 av_log(NULL, AV_LOG_DEBUG, "put_v %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line);
183 static inline void put_s_trace(ByteIOContext *bc, int64_t v, char *file, char *func, int line){
184 av_log(NULL, AV_LOG_DEBUG, "put_s %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line);
188 #define put_v(bc, v) put_v_trace(bc, v, __FILE__, __PRETTY_FUNCTION__, __LINE__)
189 #define put_s(bc, v) put_s_trace(bc, v, __FILE__, __PRETTY_FUNCTION__, __LINE__)
192 //FIXME remove calculate_checksum
193 static void put_packet(NUTContext *nut, ByteIOContext *bc, ByteIOContext *dyn_bc, int calculate_checksum, uint64_t startcode){
194 uint8_t *dyn_buf=NULL;
195 int dyn_size= url_close_dyn_buf(dyn_bc, &dyn_buf);
196 int forw_ptr= dyn_size + 4*calculate_checksum;
199 init_checksum(bc, ff_crc04C11DB7_update, 0);
200 put_be64(bc, startcode);
203 put_le32(bc, get_checksum(bc));
205 if(calculate_checksum)
206 init_checksum(bc, ff_crc04C11DB7_update, 0);
207 put_buffer(bc, dyn_buf, dyn_size);
208 if(calculate_checksum)
209 put_le32(bc, get_checksum(bc));
214 static void write_mainheader(NUTContext *nut, ByteIOContext *bc){
215 int i, j, tmp_pts, tmp_flags, tmp_stream, tmp_mul, tmp_size, tmp_fields;
217 put_v(bc, 3); /* version */
218 put_v(bc, nut->avf->nb_streams);
219 put_v(bc, MAX_DISTANCE);
220 put_v(bc, nut->time_base_count);
222 for(i=0; i<nut->time_base_count; i++){
223 put_v(bc, nut->time_base[i].num);
224 put_v(bc, nut->time_base[i].den);
234 if(tmp_pts != nut->frame_code[i].pts_delta) tmp_fields=1;
235 if(tmp_mul != nut->frame_code[i].size_mul ) tmp_fields=2;
236 if(tmp_stream != nut->frame_code[i].stream_id) tmp_fields=3;
237 if(tmp_size != nut->frame_code[i].size_lsb ) tmp_fields=4;
238 // if(tmp_res != nut->frame_code[i].res ) tmp_fields=5;
240 tmp_pts = nut->frame_code[i].pts_delta;
241 tmp_flags = nut->frame_code[i].flags;
242 tmp_stream= nut->frame_code[i].stream_id;
243 tmp_mul = nut->frame_code[i].size_mul;
244 tmp_size = nut->frame_code[i].size_lsb;
245 // tmp_res = nut->frame_code[i].res;
247 for(j=0; i<256; j++,i++){
252 if(nut->frame_code[i].pts_delta != tmp_pts ) break;
253 if(nut->frame_code[i].flags != tmp_flags ) break;
254 if(nut->frame_code[i].stream_id != tmp_stream) break;
255 if(nut->frame_code[i].size_mul != tmp_mul ) break;
256 if(nut->frame_code[i].size_lsb != tmp_size+j) break;
257 // if(nut->frame_code[i].res != tmp_res ) break;
259 if(j != tmp_mul - tmp_size) tmp_fields=6;
261 put_v(bc, tmp_flags);
262 put_v(bc, tmp_fields);
263 if(tmp_fields>0) put_s(bc, tmp_pts);
264 if(tmp_fields>1) put_v(bc, tmp_mul);
265 if(tmp_fields>2) put_v(bc, tmp_stream);
266 if(tmp_fields>3) put_v(bc, tmp_size);
267 if(tmp_fields>4) put_v(bc, 0 /*tmp_res*/);
268 if(tmp_fields>5) put_v(bc, j);
272 static int write_streamheader(NUTContext *nut, ByteIOContext *bc, AVCodecContext *codec, int i){
274 switch(codec->codec_type){
275 case CODEC_TYPE_VIDEO: put_v(bc, 0); break;
276 case CODEC_TYPE_AUDIO: put_v(bc, 1); break;
277 // case CODEC_TYPE_TEXT : put_v(bc, 2); break;
278 default : put_v(bc, 3); break;
281 if (codec->codec_tag){
282 put_le32(bc, codec->codec_tag);
286 put_v(bc, nut->stream[i].time_base - nut->time_base);
287 put_v(bc, nut->stream[i].msb_pts_shift);
288 put_v(bc, nut->stream[i].max_pts_distance);
289 put_v(bc, codec->has_b_frames);
290 put_byte(bc, 0); /* flags: 0x1 - fixed_fps, 0x2 - index_present */
292 put_v(bc, codec->extradata_size);
293 put_buffer(bc, codec->extradata, codec->extradata_size);
295 switch(codec->codec_type){
296 case CODEC_TYPE_AUDIO:
297 put_v(bc, codec->sample_rate);
299 put_v(bc, codec->channels);
301 case CODEC_TYPE_VIDEO:
302 put_v(bc, codec->width);
303 put_v(bc, codec->height);
305 if(codec->sample_aspect_ratio.num<=0 || codec->sample_aspect_ratio.den<=0){
309 put_v(bc, codec->sample_aspect_ratio.num);
310 put_v(bc, codec->sample_aspect_ratio.den);
312 put_v(bc, 0); /* csp type -- unknown */
320 static int add_info(ByteIOContext *bc, char *type, char *value){
327 static int write_globalinfo(NUTContext *nut, ByteIOContext *bc){
328 AVFormatContext *s= nut->avf;
329 ByteIOContext *dyn_bc;
330 uint8_t *dyn_buf=NULL;
331 int count=0, dyn_size;
332 int ret = url_open_dyn_buf(&dyn_bc);
336 if(s->title [0]) count+= add_info(dyn_bc, "Title" , s->title);
337 if(s->author [0]) count+= add_info(dyn_bc, "Author" , s->author);
338 if(s->copyright[0]) count+= add_info(dyn_bc, "Copyright", s->copyright);
339 if(!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT))
340 count+= add_info(dyn_bc, "Encoder" , LIBAVFORMAT_IDENT);
342 put_v(bc, 0); //stream_if_plus1
343 put_v(bc, 0); //chapter_id
344 put_v(bc, 0); //timestamp_start
345 put_v(bc, 0); //length
349 dyn_size= url_close_dyn_buf(dyn_bc, &dyn_buf);
350 put_buffer(bc, dyn_buf, dyn_size);
355 static int write_headers(NUTContext *nut, ByteIOContext *bc){
356 ByteIOContext *dyn_bc;
359 ret = url_open_dyn_buf(&dyn_bc);
362 write_mainheader(nut, dyn_bc);
363 put_packet(nut, bc, dyn_bc, 1, MAIN_STARTCODE);
365 for (i=0; i < nut->avf->nb_streams; i++){
366 AVCodecContext *codec = nut->avf->streams[i]->codec;
368 ret = url_open_dyn_buf(&dyn_bc);
371 write_streamheader(nut, dyn_bc, codec, i);
372 put_packet(nut, bc, dyn_bc, 1, STREAM_STARTCODE);
375 ret = url_open_dyn_buf(&dyn_bc);
378 write_globalinfo(nut, dyn_bc);
379 put_packet(nut, bc, dyn_bc, 1, INFO_STARTCODE);
381 nut->last_syncpoint_pos= INT_MIN;
386 static int write_header(AVFormatContext *s){
387 NUTContext *nut = s->priv_data;
388 ByteIOContext *bc = s->pb;
393 nut->stream = av_mallocz(sizeof(StreamContext)*s->nb_streams);
394 nut->time_base= av_mallocz(sizeof(AVRational )*s->nb_streams);
396 for(i=0; i<s->nb_streams; i++){
397 AVStream *st= s->streams[i];
399 AVRational time_base;
400 ff_parse_specific_params(st->codec, &time_base.den, &ssize, &time_base.num);
402 av_set_pts_info(st, 64, time_base.num, time_base.den);
404 for(j=0; j<nut->time_base_count; j++){
405 if(!memcmp(&time_base, &nut->time_base[j], sizeof(AVRational))){
409 nut->time_base[j]= time_base;
410 nut->stream[i].time_base= &nut->time_base[j];
411 if(j==nut->time_base_count)
412 nut->time_base_count++;
414 if(av_q2d(time_base) >= 0.001)
415 nut->stream[i].msb_pts_shift = 7;
417 nut->stream[i].msb_pts_shift = 14;
418 nut->stream[i].max_pts_distance= FFMAX(1/av_q2d(time_base), 1);
422 assert(nut->frame_code['N'].flags == FLAG_INVALID);
424 put_buffer(bc, ID_STRING, strlen(ID_STRING));
427 write_headers(nut, bc);
429 put_flush_packet(bc);
436 static int get_needed_flags(NUTContext *nut, StreamContext *nus, FrameCode *fc, AVPacket *pkt){
439 if(pkt->flags & PKT_FLAG_KEY ) flags |= FLAG_KEY;
440 if(pkt->stream_index != fc->stream_id ) flags |= FLAG_STREAM_ID;
441 if(pkt->size / fc->size_mul ) flags |= FLAG_SIZE_MSB;
442 if(pkt->pts - nus->last_pts != fc->pts_delta) flags |= FLAG_CODED_PTS;
443 if(pkt->size > 2*nut->max_distance ) flags |= FLAG_CHECKSUM;
444 if(FFABS(pkt->pts - nus->last_pts)
445 > nus->max_pts_distance) flags |= FLAG_CHECKSUM;
447 return flags | (fc->flags & FLAG_CODED);
450 static int write_packet(AVFormatContext *s, AVPacket *pkt){
451 NUTContext *nut = s->priv_data;
452 StreamContext *nus= &nut->stream[pkt->stream_index];
453 ByteIOContext *bc = s->pb, *dyn_bc;
456 int best_length, frame_code, flags, needed_flags, i;
457 int key_frame = !!(pkt->flags & PKT_FLAG_KEY);
461 if(1LL<<(20+3*nut->header_count) <= url_ftell(bc))
462 write_headers(nut, bc);
464 if(key_frame && !!(nus->last_flags & FLAG_KEY))
467 if(pkt->size + 30/*FIXME check*/ + url_ftell(bc) >= nut->last_syncpoint_pos + nut->max_distance)
470 //FIXME: Ensure store_sp is 1 in the first place.
473 syncpoint_t *sp, dummy= {.pos= INT64_MAX};
475 ff_nut_reset_ts(nut, *nus->time_base, pkt->dts);
476 for(i=0; i<s->nb_streams; i++){
477 AVStream *st= s->streams[i];
478 int index= av_index_search_timestamp(st, pkt->dts, AVSEEK_FLAG_BACKWARD);
479 if(index<0) dummy.pos=0;
480 else dummy.pos= FFMIN(dummy.pos, st->index_entries[index].pos);
482 sp= av_tree_find(nut->syncpoints, &dummy, ff_nut_sp_pos_cmp, NULL);
484 nut->last_syncpoint_pos= url_ftell(bc);
485 ret = url_open_dyn_buf(&dyn_bc);
488 put_t(nut, nus, dyn_bc, pkt->dts);
489 put_v(dyn_bc, sp ? (nut->last_syncpoint_pos - sp->pos)>>4 : 0);
490 put_packet(nut, bc, dyn_bc, 1, SYNCPOINT_STARTCODE);
492 ff_nut_add_sp(nut, nut->last_syncpoint_pos, 0/*unused*/, pkt->dts);
494 assert(nus->last_pts != AV_NOPTS_VALUE);
496 coded_pts = pkt->pts & ((1<<nus->msb_pts_shift)-1);
497 if(ff_lsb2full(nus, coded_pts) != pkt->pts)
498 coded_pts= pkt->pts + (1<<nus->msb_pts_shift);
502 for(i=0; i<256; i++){
504 FrameCode *fc= &nut->frame_code[i];
505 int flags= fc->flags;
507 if(flags & FLAG_INVALID)
509 needed_flags= get_needed_flags(nut, nus, fc, pkt);
511 if(flags & FLAG_CODED){
513 flags = needed_flags;
516 if((flags & needed_flags) != needed_flags)
519 if((flags ^ needed_flags) & FLAG_KEY)
522 if(flags & FLAG_STREAM_ID)
523 length+= get_length(pkt->stream_index);
525 if(pkt->size % fc->size_mul != fc->size_lsb)
527 if(flags & FLAG_SIZE_MSB)
528 length += get_length(pkt->size / fc->size_mul);
530 if(flags & FLAG_CHECKSUM)
533 if(flags & FLAG_CODED_PTS)
534 length += get_length(coded_pts);
537 length+= !(flags & FLAG_CODED_PTS);
538 length+= !(flags & FLAG_CHECKSUM);
540 if(length < best_length){
545 assert(frame_code != -1);
546 fc= &nut->frame_code[frame_code];
548 needed_flags= get_needed_flags(nut, nus, fc, pkt);
550 init_checksum(bc, ff_crc04C11DB7_update, 0);
551 put_byte(bc, frame_code);
552 if(flags & FLAG_CODED){
553 put_v(bc, (flags^needed_flags) & ~(FLAG_CODED));
554 flags = needed_flags;
556 if(flags & FLAG_STREAM_ID) put_v(bc, pkt->stream_index);
557 if(flags & FLAG_CODED_PTS) put_v(bc, coded_pts);
558 if(flags & FLAG_SIZE_MSB) put_v(bc, pkt->size / fc->size_mul);
560 if(flags & FLAG_CHECKSUM) put_le32(bc, get_checksum(bc));
561 else get_checksum(bc);
563 put_buffer(bc, pkt->data, pkt->size);
564 nus->last_flags= flags;
566 //FIXME just store one per syncpoint
569 s->streams[pkt->stream_index],
570 nut->last_syncpoint_pos,
579 static int write_trailer(AVFormatContext *s){
580 NUTContext *nut= s->priv_data;
581 ByteIOContext *bc= s->pb;
583 while(nut->header_count<3)
584 write_headers(nut, bc);
585 put_flush_packet(bc);
590 AVOutputFormat nut_muxer = {
596 #ifdef CONFIG_LIBVORBIS
598 #elif defined(CONFIG_LIBMP3LAME)
601 CODEC_ID_MP2, /* AC3 needs liba52 decoder */
607 .flags = AVFMT_GLOBALHEADER,
608 .codec_tag= (const AVCodecTag*[]){codec_bmp_tags, codec_wav_tags, 0},