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
26 static void build_frame_code(AVFormatContext *s){
27 NUTContext *nut = s->priv_data;
28 int key_frame, index, pred, stream_id;
31 int keyframe_0_esc= s->nb_streams > 2;
35 ft= &nut->frame_code[start];
36 ft->flags= FLAG_CODED;
42 /* keyframe = 0 escape */
43 FrameCode *ft= &nut->frame_code[start];
44 ft->flags= FLAG_STREAM_ID | FLAG_SIZE_MSB | FLAG_CODED_PTS;
49 for(stream_id= 0; stream_id<s->nb_streams; stream_id++){
50 int start2= start + (end-start)*stream_id / s->nb_streams;
51 int end2 = start + (end-start)*(stream_id+1) / s->nb_streams;
52 AVCodecContext *codec = s->streams[stream_id]->codec;
53 int is_audio= codec->codec_type == CODEC_TYPE_AUDIO;
54 int intra_only= /*codec->intra_only || */is_audio;
57 for(key_frame=0; key_frame<2; key_frame++){
58 if(intra_only && keyframe_0_esc && key_frame==0)
62 FrameCode *ft= &nut->frame_code[start2];
63 ft->flags= FLAG_KEY*key_frame;
64 ft->flags|= FLAG_SIZE_MSB | FLAG_CODED_PTS;
65 ft->stream_id= stream_id;
71 key_frame= intra_only;
74 int frame_bytes= codec->frame_size*(int64_t)codec->bit_rate / (8*codec->sample_rate);
76 for(pts=0; pts<2; pts++){
77 for(pred=0; pred<2; pred++){
78 FrameCode *ft= &nut->frame_code[start2];
79 ft->flags= FLAG_KEY*key_frame;
80 ft->stream_id= stream_id;
81 ft->size_mul=frame_bytes + 2;
82 ft->size_lsb=frame_bytes + pred;
88 FrameCode *ft= &nut->frame_code[start2];
89 ft->flags= FLAG_KEY | FLAG_SIZE_MSB;
90 ft->stream_id= stream_id;
97 if(codec->has_b_frames){
104 }else if(codec->codec_id == CODEC_ID_VORBIS){
114 for(pred=0; pred<pred_count; pred++){
115 int start3= start2 + (end2-start2)*pred / pred_count;
116 int end3 = start2 + (end2-start2)*(pred+1) / pred_count;
118 for(index=start3; index<end3; index++){
119 FrameCode *ft= &nut->frame_code[index];
120 ft->flags= FLAG_KEY*key_frame;
121 ft->flags|= FLAG_SIZE_MSB;
122 ft->stream_id= stream_id;
123 //FIXME use single byte size and pred from last
124 ft->size_mul= end3-start3;
125 ft->size_lsb= index - start3;
126 ft->pts_delta= pred_table[pred];
130 memmove(&nut->frame_code['N'+1], &nut->frame_code['N'], sizeof(FrameCode)*(255-'N'));
131 nut->frame_code[ 0].flags=
132 nut->frame_code[255].flags=
133 nut->frame_code['N'].flags= FLAG_INVALID;
137 * Gets the length in bytes which is needed to store val as v.
139 static int get_length(uint64_t val){
148 static void put_v(ByteIOContext *bc, uint64_t val){
149 int i= get_length(val);
152 put_byte(bc, 128 | (val>>(7*i)));
154 put_byte(bc, val&127);
158 * stores a string as vb.
160 static void put_str(ByteIOContext *bc, const char *string){
161 int len= strlen(string);
164 put_buffer(bc, string, len);
167 static void put_s(ByteIOContext *bc, int64_t val){
168 put_v(bc, 2*FFABS(val) - (val>0));
172 static inline void put_v_trace(ByteIOContext *bc, uint64_t v, char *file, char *func, int line){
173 printf("get_v %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line);
178 static inline void put_s_trace(ByteIOContext *bc, int64_t v, char *file, char *func, int line){
179 printf("get_s %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line);
183 #define put_v(bc, v) put_v_trace(bc, v, __FILE__, __PRETTY_FUNCTION__, __LINE__)
184 #define put_s(bc, v) put_s_trace(bc, v, __FILE__, __PRETTY_FUNCTION__, __LINE__)
187 //FIXME remove calculate_checksum
188 static void put_packet(NUTContext *nut, ByteIOContext *bc, ByteIOContext *dyn_bc, int calculate_checksum){
189 uint8_t *dyn_buf=NULL;
190 int dyn_size= url_close_dyn_buf(dyn_bc, &dyn_buf);
191 int forw_ptr= dyn_size + 4*calculate_checksum;
194 init_checksum(bc, av_crc04C11DB7_update, 0); //FIXME this is supposed to include the start code
197 put_le32(bc, get_checksum(bc));
199 if(calculate_checksum)
200 init_checksum(bc, av_crc04C11DB7_update, 0);
201 put_buffer(bc, dyn_buf, dyn_size);
202 if(calculate_checksum)
203 put_le32(bc, get_checksum(bc));
208 static void write_mainheader(NUTContext *nut, ByteIOContext *bc){
209 int i, j, tmp_pts, tmp_flags, tmp_stream, tmp_mul, tmp_size, tmp_fields;
211 put_v(bc, 2); /* version */
212 put_v(bc, nut->avf->nb_streams);
213 put_v(bc, MAX_DISTANCE);
214 put_v(bc, nut->time_base_count);
216 for(i=0; i<nut->time_base_count; i++){
217 put_v(bc, nut->time_base[i].num);
218 put_v(bc, nut->time_base[i].den);
228 if(tmp_pts != nut->frame_code[i].pts_delta) tmp_fields=1;
229 if(tmp_mul != nut->frame_code[i].size_mul ) tmp_fields=2;
230 if(tmp_stream != nut->frame_code[i].stream_id) tmp_fields=3;
231 if(tmp_size != nut->frame_code[i].size_lsb ) tmp_fields=4;
232 // if(tmp_res != nut->frame_code[i].res ) tmp_fields=5;
234 tmp_pts = nut->frame_code[i].pts_delta;
235 tmp_flags = nut->frame_code[i].flags;
236 tmp_stream= nut->frame_code[i].stream_id;
237 tmp_mul = nut->frame_code[i].size_mul;
238 tmp_size = nut->frame_code[i].size_lsb;
239 // tmp_res = nut->frame_code[i].res;
241 for(j=0; i<256; j++,i++){
246 if(nut->frame_code[i].pts_delta != tmp_pts ) break;
247 if(nut->frame_code[i].flags != tmp_flags ) break;
248 if(nut->frame_code[i].stream_id != tmp_stream) break;
249 if(nut->frame_code[i].size_mul != tmp_mul ) break;
250 if(nut->frame_code[i].size_lsb != tmp_size+j) break;
251 // if(nut->frame_code[i].res != tmp_res ) break;
253 if(j != tmp_mul - tmp_size) tmp_fields=6;
255 put_v(bc, tmp_flags);
256 put_v(bc, tmp_fields);
257 if(tmp_fields>0) put_s(bc, tmp_pts);
258 if(tmp_fields>1) put_v(bc, tmp_mul);
259 if(tmp_fields>2) put_v(bc, tmp_stream);
260 if(tmp_fields>3) put_v(bc, tmp_size);
261 if(tmp_fields>4) put_v(bc, 0 /*tmp_res*/);
262 if(tmp_fields>5) put_v(bc, j);
266 static int write_streamheader(NUTContext *nut, ByteIOContext *bc, AVCodecContext *codec, int i){
268 switch(codec->codec_type){
269 case CODEC_TYPE_VIDEO: put_v(bc, 0); break;
270 case CODEC_TYPE_AUDIO: put_v(bc, 1); break;
271 // case CODEC_TYPE_TEXT : put_v(bc, 2); break;
272 default : put_v(bc, 3); break;
275 if (codec->codec_tag){
276 put_le32(bc, codec->codec_tag);
280 put_v(bc, nut->stream[i].time_base - nut->time_base);
281 put_v(bc, nut->stream[i].msb_pts_shift);
282 put_v(bc, nut->stream[i].max_pts_distance);
283 put_v(bc, codec->has_b_frames);
284 put_byte(bc, 0); /* flags: 0x1 - fixed_fps, 0x2 - index_present */
286 put_v(bc, codec->extradata_size);
287 put_buffer(bc, codec->extradata, codec->extradata_size);
289 switch(codec->codec_type){
290 case CODEC_TYPE_AUDIO:
291 put_v(bc, codec->sample_rate);
293 put_v(bc, codec->channels);
295 case CODEC_TYPE_VIDEO:
296 put_v(bc, codec->width);
297 put_v(bc, codec->height);
298 put_v(bc, codec->sample_aspect_ratio.num);
299 put_v(bc, codec->sample_aspect_ratio.den);
300 put_v(bc, 0); /* csp type -- unknown */
308 static int write_header(AVFormatContext *s){
309 NUTContext *nut = s->priv_data;
310 ByteIOContext *bc = &s->pb, dyn_bc;
311 AVCodecContext *codec;
316 nut->stream = av_mallocz(sizeof(StreamContext)*s->nb_streams);
317 nut->time_base= av_mallocz(sizeof(AVRational )*s->nb_streams);
319 for(i=0; i<s->nb_streams; i++){
320 AVStream *st= s->streams[i];
322 AVRational time_base;
323 ff_parse_specific_params(st->codec, &time_base.den, &ssize, &time_base.num);
325 av_set_pts_info(st, 64, time_base.num, time_base.den);
327 for(j=0; j<nut->time_base_count; j++){
328 if(!memcmp(&time_base, &nut->time_base[j], sizeof(AVRational))){
332 nut->time_base[j]= time_base;
333 nut->stream[i].time_base= &nut->time_base[j];
334 if(j==nut->time_base_count)
335 nut->time_base_count++;
337 if(av_q2d(time_base) >= 0.001)
338 nut->stream[i].msb_pts_shift = 7;
340 nut->stream[i].msb_pts_shift = 14;
341 nut->stream[i].max_pts_distance= FFMAX(1/av_q2d(time_base), 1);
345 assert(nut->frame_code['N'].flags == FLAG_INVALID);
347 put_buffer(bc, ID_STRING, strlen(ID_STRING));
351 put_be64(bc, MAIN_STARTCODE);
352 url_open_dyn_buf(&dyn_bc);
353 write_mainheader(nut, &dyn_bc);
354 put_packet(nut, bc, &dyn_bc, 1);
356 for (i=0; i < s->nb_streams; i++){
357 codec = s->streams[i]->codec;
359 put_be64(bc, STREAM_STARTCODE);
360 url_open_dyn_buf(&dyn_bc);
361 write_streamheader(nut, &dyn_bc, codec, i);
362 put_packet(nut, bc, &dyn_bc, 1);
365 put_flush_packet(bc);
367 //FIXME info header, header repeation, ...
372 static int write_packet(AVFormatContext *s, AVPacket *pkt){
377 AVOutputFormat nut_muxer = {
383 #ifdef CONFIG_LIBVORBIS
385 #elif defined(CONFIG_LIBMP3LAME)
388 CODEC_ID_MP2, /* AC3 needs liba52 decoder */
394 .flags = AVFMT_GLOBALHEADER,
395 .codec_tag= (const AVCodecTag*[]){codec_bmp_tags, codec_wav_tags, 0},