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
27 static void build_frame_code(AVFormatContext *s){
28 NUTContext *nut = s->priv_data;
29 int key_frame, index, pred, stream_id;
32 int keyframe_0_esc= s->nb_streams > 2;
36 ft= &nut->frame_code[start];
37 ft->flags= FLAG_CODED;
43 /* keyframe = 0 escape */
44 FrameCode *ft= &nut->frame_code[start];
45 ft->flags= FLAG_STREAM_ID | FLAG_SIZE_MSB | FLAG_CODED_PTS;
50 for(stream_id= 0; stream_id<s->nb_streams; stream_id++){
51 int start2= start + (end-start)*stream_id / s->nb_streams;
52 int end2 = start + (end-start)*(stream_id+1) / s->nb_streams;
53 AVCodecContext *codec = s->streams[stream_id]->codec;
54 int is_audio= codec->codec_type == CODEC_TYPE_AUDIO;
55 int intra_only= /*codec->intra_only || */is_audio;
58 for(key_frame=0; key_frame<2; key_frame++){
59 if(intra_only && keyframe_0_esc && key_frame==0)
63 FrameCode *ft= &nut->frame_code[start2];
64 ft->flags= FLAG_KEY*key_frame;
65 ft->flags|= FLAG_SIZE_MSB | FLAG_CODED_PTS;
66 ft->stream_id= stream_id;
72 key_frame= intra_only;
75 int frame_bytes= codec->frame_size*(int64_t)codec->bit_rate / (8*codec->sample_rate);
77 for(pts=0; pts<2; pts++){
78 for(pred=0; pred<2; pred++){
79 FrameCode *ft= &nut->frame_code[start2];
80 ft->flags= FLAG_KEY*key_frame;
81 ft->stream_id= stream_id;
82 ft->size_mul=frame_bytes + 2;
83 ft->size_lsb=frame_bytes + pred;
89 FrameCode *ft= &nut->frame_code[start2];
90 ft->flags= FLAG_KEY | FLAG_SIZE_MSB;
91 ft->stream_id= stream_id;
98 if(codec->has_b_frames){
105 }else if(codec->codec_id == CODEC_ID_VORBIS){
115 for(pred=0; pred<pred_count; pred++){
116 int start3= start2 + (end2-start2)*pred / pred_count;
117 int end3 = start2 + (end2-start2)*(pred+1) / pred_count;
119 for(index=start3; index<end3; index++){
120 FrameCode *ft= &nut->frame_code[index];
121 ft->flags= FLAG_KEY*key_frame;
122 ft->flags|= FLAG_SIZE_MSB;
123 ft->stream_id= stream_id;
124 //FIXME use single byte size and pred from last
125 ft->size_mul= end3-start3;
126 ft->size_lsb= index - start3;
127 ft->pts_delta= pred_table[pred];
131 memmove(&nut->frame_code['N'+1], &nut->frame_code['N'], sizeof(FrameCode)*(255-'N'));
132 nut->frame_code[ 0].flags=
133 nut->frame_code[255].flags=
134 nut->frame_code['N'].flags= FLAG_INVALID;
138 * Gets the length in bytes which is needed to store val as v.
140 static int get_length(uint64_t val){
149 static void put_v(ByteIOContext *bc, uint64_t val){
150 int i= get_length(val);
153 put_byte(bc, 128 | (val>>(7*i)));
155 put_byte(bc, val&127);
158 static void put_t(NUTContext *nut, StreamContext *nus, ByteIOContext *bc, uint64_t val){
159 val *= nut->time_base_count;
160 val += nus->time_base - nut->time_base;
165 * stores a string as vb.
167 static void put_str(ByteIOContext *bc, const char *string){
168 int len= strlen(string);
171 put_buffer(bc, string, len);
174 static void put_s(ByteIOContext *bc, int64_t val){
175 put_v(bc, 2*FFABS(val) - (val>0));
179 static inline void put_v_trace(ByteIOContext *bc, uint64_t v, char *file, char *func, int line){
180 av_log(NULL, AV_LOG_DEBUG, "put_v %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line);
185 static inline void put_s_trace(ByteIOContext *bc, int64_t v, char *file, char *func, int line){
186 av_log(NULL, AV_LOG_DEBUG, "put_s %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line);
190 #define put_v(bc, v) put_v_trace(bc, v, __FILE__, __PRETTY_FUNCTION__, __LINE__)
191 #define put_s(bc, v) put_s_trace(bc, v, __FILE__, __PRETTY_FUNCTION__, __LINE__)
194 //FIXME remove calculate_checksum
195 static void put_packet(NUTContext *nut, ByteIOContext *bc, ByteIOContext *dyn_bc, int calculate_checksum, uint64_t startcode){
196 uint8_t *dyn_buf=NULL;
197 int dyn_size= url_close_dyn_buf(dyn_bc, &dyn_buf);
198 int forw_ptr= dyn_size + 4*calculate_checksum;
201 init_checksum(bc, av_crc04C11DB7_update, 0);
202 put_be64(bc, startcode);
205 put_le32(bc, get_checksum(bc));
207 if(calculate_checksum)
208 init_checksum(bc, av_crc04C11DB7_update, 0);
209 put_buffer(bc, dyn_buf, dyn_size);
210 if(calculate_checksum)
211 put_le32(bc, get_checksum(bc));
216 static void write_mainheader(NUTContext *nut, ByteIOContext *bc){
217 int i, j, tmp_pts, tmp_flags, tmp_stream, tmp_mul, tmp_size, tmp_fields;
219 put_v(bc, 2); /* version */
220 put_v(bc, nut->avf->nb_streams);
221 put_v(bc, MAX_DISTANCE);
222 put_v(bc, nut->time_base_count);
224 for(i=0; i<nut->time_base_count; i++){
225 put_v(bc, nut->time_base[i].num);
226 put_v(bc, nut->time_base[i].den);
236 if(tmp_pts != nut->frame_code[i].pts_delta) tmp_fields=1;
237 if(tmp_mul != nut->frame_code[i].size_mul ) tmp_fields=2;
238 if(tmp_stream != nut->frame_code[i].stream_id) tmp_fields=3;
239 if(tmp_size != nut->frame_code[i].size_lsb ) tmp_fields=4;
240 // if(tmp_res != nut->frame_code[i].res ) tmp_fields=5;
242 tmp_pts = nut->frame_code[i].pts_delta;
243 tmp_flags = nut->frame_code[i].flags;
244 tmp_stream= nut->frame_code[i].stream_id;
245 tmp_mul = nut->frame_code[i].size_mul;
246 tmp_size = nut->frame_code[i].size_lsb;
247 // tmp_res = nut->frame_code[i].res;
249 for(j=0; i<256; j++,i++){
254 if(nut->frame_code[i].pts_delta != tmp_pts ) break;
255 if(nut->frame_code[i].flags != tmp_flags ) break;
256 if(nut->frame_code[i].stream_id != tmp_stream) break;
257 if(nut->frame_code[i].size_mul != tmp_mul ) break;
258 if(nut->frame_code[i].size_lsb != tmp_size+j) break;
259 // if(nut->frame_code[i].res != tmp_res ) break;
261 if(j != tmp_mul - tmp_size) tmp_fields=6;
263 put_v(bc, tmp_flags);
264 put_v(bc, tmp_fields);
265 if(tmp_fields>0) put_s(bc, tmp_pts);
266 if(tmp_fields>1) put_v(bc, tmp_mul);
267 if(tmp_fields>2) put_v(bc, tmp_stream);
268 if(tmp_fields>3) put_v(bc, tmp_size);
269 if(tmp_fields>4) put_v(bc, 0 /*tmp_res*/);
270 if(tmp_fields>5) put_v(bc, j);
274 static int write_streamheader(NUTContext *nut, ByteIOContext *bc, AVCodecContext *codec, int i){
276 switch(codec->codec_type){
277 case CODEC_TYPE_VIDEO: put_v(bc, 0); break;
278 case CODEC_TYPE_AUDIO: put_v(bc, 1); break;
279 // case CODEC_TYPE_TEXT : put_v(bc, 2); break;
280 default : put_v(bc, 3); break;
283 if (codec->codec_tag){
284 put_le32(bc, codec->codec_tag);
288 put_v(bc, nut->stream[i].time_base - nut->time_base);
289 put_v(bc, nut->stream[i].msb_pts_shift);
290 put_v(bc, nut->stream[i].max_pts_distance);
291 put_v(bc, codec->has_b_frames);
292 put_byte(bc, 0); /* flags: 0x1 - fixed_fps, 0x2 - index_present */
294 put_v(bc, codec->extradata_size);
295 put_buffer(bc, codec->extradata, codec->extradata_size);
297 switch(codec->codec_type){
298 case CODEC_TYPE_AUDIO:
299 put_v(bc, codec->sample_rate);
301 put_v(bc, codec->channels);
303 case CODEC_TYPE_VIDEO:
304 put_v(bc, codec->width);
305 put_v(bc, codec->height);
306 put_v(bc, codec->sample_aspect_ratio.num);
307 put_v(bc, codec->sample_aspect_ratio.den);
308 put_v(bc, 0); /* csp type -- unknown */
316 static void write_headers(NUTContext *nut, ByteIOContext *bc){
317 ByteIOContext dyn_bc;
320 url_open_dyn_buf(&dyn_bc);
321 write_mainheader(nut, &dyn_bc);
322 put_packet(nut, bc, &dyn_bc, 1, MAIN_STARTCODE);
324 for (i=0; i < nut->avf->nb_streams; i++){
325 AVCodecContext *codec = nut->avf->streams[i]->codec;
327 url_open_dyn_buf(&dyn_bc);
328 write_streamheader(nut, &dyn_bc, codec, i);
329 put_packet(nut, bc, &dyn_bc, 1, STREAM_STARTCODE);
333 static int write_header(AVFormatContext *s){
334 NUTContext *nut = s->priv_data;
335 ByteIOContext *bc = &s->pb;
340 nut->stream = av_mallocz(sizeof(StreamContext)*s->nb_streams);
341 nut->time_base= av_mallocz(sizeof(AVRational )*s->nb_streams);
343 for(i=0; i<s->nb_streams; i++){
344 AVStream *st= s->streams[i];
346 AVRational time_base;
347 ff_parse_specific_params(st->codec, &time_base.den, &ssize, &time_base.num);
349 av_set_pts_info(st, 64, time_base.num, time_base.den);
351 for(j=0; j<nut->time_base_count; j++){
352 if(!memcmp(&time_base, &nut->time_base[j], sizeof(AVRational))){
356 nut->time_base[j]= time_base;
357 nut->stream[i].time_base= &nut->time_base[j];
358 if(j==nut->time_base_count)
359 nut->time_base_count++;
361 if(av_q2d(time_base) >= 0.001)
362 nut->stream[i].msb_pts_shift = 7;
364 nut->stream[i].msb_pts_shift = 14;
365 nut->stream[i].max_pts_distance= FFMAX(1/av_q2d(time_base), 1);
369 assert(nut->frame_code['N'].flags == FLAG_INVALID);
371 put_buffer(bc, ID_STRING, strlen(ID_STRING));
374 write_headers(nut, bc);
376 put_flush_packet(bc);
378 //FIXME info header, header repeation, ...
383 static int get_needed_flags(NUTContext *nut, StreamContext *nus, FrameCode *fc, AVPacket *pkt){
386 if(pkt->flags & PKT_FLAG_KEY ) flags |= FLAG_KEY;
387 if(pkt->stream_index != fc->stream_id ) flags |= FLAG_STREAM_ID;
388 if(pkt->size / fc->size_mul ) flags |= FLAG_SIZE_MSB;
389 if(pkt->pts - nus->last_pts != fc->pts_delta) flags |= FLAG_CODED_PTS;
390 if(pkt->size > 2*nut->max_distance ) flags |= FLAG_CHECKSUM;
391 if(FFABS(pkt->pts - nus->last_pts)
392 > nus->max_pts_distance) flags |= FLAG_CHECKSUM;
397 static int write_packet(AVFormatContext *s, AVPacket *pkt){
398 NUTContext *nut = s->priv_data;
399 StreamContext *nus= &nut->stream[pkt->stream_index];
400 ByteIOContext *bc = &s->pb, dyn_bc;
403 int best_length, frame_code, flags, needed_flags, i;
404 int key_frame = !!(pkt->flags & PKT_FLAG_KEY);
407 if(key_frame && !!(nus->last_flags & FLAG_KEY))
410 if(pkt->size + 30/*FIXME check*/ + url_ftell(bc) >= nut->last_syncpoint_pos + nut->max_distance)
413 //FIXME ensure store_sp is 1 for the first thing
416 syncpoint_t *sp, dummy= {.pos= INT64_MAX};
418 ff_nut_reset_ts(nut, *nus->time_base, pkt->dts);
419 for(i=0; i<s->nb_streams; i++){
420 AVStream *st= s->streams[i];
421 int index= av_index_search_timestamp(st, pkt->dts, AVSEEK_FLAG_BACKWARD);
422 if(index<0) dummy.pos=0;
423 else dummy.pos= FFMIN(dummy.pos, st->index_entries[index].pos);
425 sp= av_tree_find(nut->syncpoints, &dummy, ff_nut_sp_pos_cmp, NULL);
427 nut->last_syncpoint_pos= url_ftell(bc);
428 url_open_dyn_buf(&dyn_bc);
429 put_t(nut, nus, &dyn_bc, pkt->dts);
430 put_v(&dyn_bc, sp ? (nut->last_syncpoint_pos - sp->pos)>>4 : 0);
431 put_packet(nut, bc, &dyn_bc, 1, SYNCPOINT_STARTCODE);
433 ff_nut_add_sp(nut, nut->last_syncpoint_pos, 0/*unused*/, pkt->dts);
435 assert(nus->last_pts != AV_NOPTS_VALUE);
437 coded_pts = pkt->pts & ((1<<nus->msb_pts_shift)-1);
438 if(ff_lsb2full(nus, coded_pts) != pkt->pts)
439 coded_pts= pkt->pts + (1<<nus->msb_pts_shift);
443 for(i=0; i<256; i++){
445 FrameCode *fc= &nut->frame_code[i];
446 int flags= fc->flags;
448 if(flags & FLAG_INVALID)
450 needed_flags= get_needed_flags(nut, nus, fc, pkt);
452 if(flags & FLAG_CODED){
454 flags &= ~needed_flags;
455 flags |= needed_flags;
458 if((flags & needed_flags) != needed_flags)
461 if((flags ^ needed_flags) & FLAG_KEY)
464 if(flags & FLAG_STREAM_ID)
465 length+= get_length(pkt->stream_index);
467 if(pkt->size % fc->size_mul != fc->size_lsb)
469 if(flags & FLAG_SIZE_MSB)
470 length += get_length(pkt->size / fc->size_mul);
472 if(flags & FLAG_CHECKSUM)
475 if(flags & FLAG_CODED_PTS)
476 length += get_length(coded_pts);
479 length+= !(flags & FLAG_CODED_PTS);
480 length+= !(flags & FLAG_CHECKSUM);
482 if(length < best_length){
487 assert(frame_code != -1);
488 fc= &nut->frame_code[frame_code];
490 needed_flags= get_needed_flags(nut, nus, fc, pkt);
492 init_checksum(bc, av_crc04C11DB7_update, 0);
493 put_byte(bc, frame_code);
494 if(flags & FLAG_CODED){
495 put_v(bc, (flags^needed_flags) & ~(FLAG_CODED));
496 flags = needed_flags;
498 if(flags & FLAG_STREAM_ID) put_v(bc, pkt->stream_index);
499 if(flags & FLAG_CODED_PTS) put_v(bc, coded_pts);
500 if(flags & FLAG_SIZE_MSB) put_v(bc, pkt->size / fc->size_mul);
502 if(flags & FLAG_CHECKSUM) put_le32(bc, get_checksum(bc));
503 else get_checksum(bc);
505 put_buffer(bc, pkt->data, pkt->size);
506 nus->last_flags= flags;
508 //FIXME just store one per syncpoint
511 s->streams[pkt->stream_index],
512 nut->last_syncpoint_pos,
521 static int write_trailer(AVFormatContext *s){
522 NUTContext *nut= s->priv_data;
523 ByteIOContext *bc= &s->pb;
525 write_headers(nut, bc);
526 put_flush_packet(bc);
531 AVOutputFormat nut_muxer = {
537 #ifdef CONFIG_LIBVORBIS
539 #elif defined(CONFIG_LIBMP3LAME)
542 CODEC_ID_MP2, /* AC3 needs liba52 decoder */
548 .flags = AVFMT_GLOBALHEADER,
549 .codec_tag= (const AVCodecTag*[]){codec_bmp_tags, codec_wav_tags, 0},