ooops
[libav.git] / output_example.c
1 /*
2 * Libavformat API example: Output a media file in any supported
3 * libavformat format. The default codecs are used.
4 *
5 * Copyright (c) 2003 Fabrice Bellard
6 *
7 * Permission is hereby granted, free of charge, to any person obtaining a copy
8 * of this software and associated documentation files (the "Software"), to deal
9 * in the Software without restriction, including without limitation the rights
10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
11 * copies of the Software, and to permit persons to whom the Software is
12 * furnished to do so, subject to the following conditions:
13 *
14 * The above copyright notice and this permission notice shall be included in
15 * all copies or substantial portions of the Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
23 * THE SOFTWARE.
24 */
25 #include <stdlib.h>
26 #include <stdio.h>
27 #include <string.h>
28 #include <math.h>
29
30 #ifndef M_PI
31 #define M_PI 3.1415926535897931
32 #endif
33
34 #include "avformat.h"
35
36 /* 5 seconds stream duration */
37 #define STREAM_DURATION 5.0
38 #define STREAM_FRAME_RATE 25 /* 25 images/s */
39 #define STREAM_NB_FRAMES ((int)(STREAM_DURATION * STREAM_FRAME_RATE))
40
41 /**************************************************************/
42 /* audio output */
43
44 float t, tincr, tincr2;
45 int16_t *samples;
46 uint8_t *audio_outbuf;
47 int audio_outbuf_size;
48 int audio_input_frame_size;
49
50 /*
51 * add an audio output stream
52 */
53 AVStream *add_audio_stream(AVFormatContext *oc, int codec_id)
54 {
55 AVCodecContext *c;
56 AVStream *st;
57
58 st = av_new_stream(oc, 1);
59 if (!st) {
60 fprintf(stderr, "Could not alloc stream\n");
61 exit(1);
62 }
63
64 c = &st->codec;
65 c->codec_id = codec_id;
66 c->codec_type = CODEC_TYPE_AUDIO;
67
68 /* put sample parameters */
69 c->bit_rate = 64000;
70 c->sample_rate = 44100;
71 c->channels = 2;
72 return st;
73 }
74
75 void open_audio(AVFormatContext *oc, AVStream *st)
76 {
77 AVCodecContext *c;
78 AVCodec *codec;
79
80 c = &st->codec;
81
82 /* find the audio encoder */
83 codec = avcodec_find_encoder(c->codec_id);
84 if (!codec) {
85 fprintf(stderr, "codec not found\n");
86 exit(1);
87 }
88
89 /* open it */
90 if (avcodec_open(c, codec) < 0) {
91 fprintf(stderr, "could not open codec\n");
92 exit(1);
93 }
94
95 /* init signal generator */
96 t = 0;
97 tincr = 2 * M_PI * 110.0 / c->sample_rate;
98 /* increment frequency by 110 Hz per second */
99 tincr2 = 2 * M_PI * 110.0 / c->sample_rate / c->sample_rate;
100
101 audio_outbuf_size = 10000;
102 audio_outbuf = malloc(audio_outbuf_size);
103
104 /* ugly hack for PCM codecs (will be removed ASAP with new PCM
105 support to compute the input frame size in samples */
106 if (c->frame_size <= 1) {
107 audio_input_frame_size = audio_outbuf_size / c->channels;
108 switch(st->codec.codec_id) {
109 case CODEC_ID_PCM_S16LE:
110 case CODEC_ID_PCM_S16BE:
111 case CODEC_ID_PCM_U16LE:
112 case CODEC_ID_PCM_U16BE:
113 audio_input_frame_size >>= 1;
114 break;
115 default:
116 break;
117 }
118 } else {
119 audio_input_frame_size = c->frame_size;
120 }
121 samples = malloc(audio_input_frame_size * 2 * c->channels);
122 }
123
124 /* prepare a 16 bit dummy audio frame of 'frame_size' samples and
125 'nb_channels' channels */
126 void get_audio_frame(int16_t *samples, int frame_size, int nb_channels)
127 {
128 int j, i, v;
129 int16_t *q;
130
131 q = samples;
132 for(j=0;j<frame_size;j++) {
133 v = (int)(sin(t) * 10000);
134 for(i = 0; i < nb_channels; i++)
135 *q++ = v;
136 t += tincr;
137 tincr += tincr2;
138 }
139 }
140
141 void write_audio_frame(AVFormatContext *oc, AVStream *st)
142 {
143 int out_size;
144 AVCodecContext *c;
145
146
147 c = &st->codec;
148
149 get_audio_frame(samples, audio_input_frame_size, c->channels);
150
151 out_size = avcodec_encode_audio(c, audio_outbuf, audio_outbuf_size, samples);
152
153 /* write the compressed frame in the media file */
154 if (av_write_frame(oc, st->index, audio_outbuf, out_size) != 0) {
155 fprintf(stderr, "Error while writing audio frame\n");
156 exit(1);
157 }
158 }
159
160 void close_audio(AVFormatContext *oc, AVStream *st)
161 {
162 avcodec_close(&st->codec);
163
164 av_free(samples);
165 av_free(audio_outbuf);
166 }
167
168 /**************************************************************/
169 /* video output */
170
171 AVFrame *picture, *tmp_picture;
172 uint8_t *video_outbuf;
173 int frame_count, video_outbuf_size;
174
175 /* add a video output stream */
176 AVStream *add_video_stream(AVFormatContext *oc, int codec_id)
177 {
178 AVCodecContext *c;
179 AVStream *st;
180
181 st = av_new_stream(oc, 0);
182 if (!st) {
183 fprintf(stderr, "Could not alloc stream\n");
184 exit(1);
185 }
186
187 c = &st->codec;
188 c->codec_id = codec_id;
189 c->codec_type = CODEC_TYPE_VIDEO;
190
191 /* put sample parameters */
192 c->bit_rate = 400000;
193 /* resolution must be a multiple of two */
194 c->width = 352;
195 c->height = 288;
196 /* frames per second */
197 c->frame_rate = STREAM_FRAME_RATE;
198 c->frame_rate_base = 1;
199 c->gop_size = 12; /* emit one intra frame every twelve frames at most */
200 if (c->codec_id == CODEC_ID_MPEG2VIDEO) {
201 /* just for testing, we also add B frames */
202 c->max_b_frames = 2;
203 }
204 if (c->codec_id == CODEC_ID_MPEG1VIDEO){
205 /* needed to avoid using macroblocks in which some coeffs overflow
206 this doesnt happen with normal video, it just happens here as the
207 motion of the chroma plane doesnt match the luma plane */
208 c->mb_decision=2;
209 }
210 // some formats want stream headers to be seperate
211 if(!strcmp(oc->oformat->name, "mp4") || !strcmp(oc->oformat->name, "mov") || !strcmp(oc->oformat->name, "3gp"))
212 c->flags |= CODEC_FLAG_GLOBAL_HEADER;
213
214 return st;
215 }
216
217 AVFrame *alloc_picture(int pix_fmt, int width, int height)
218 {
219 AVFrame *picture;
220 uint8_t *picture_buf;
221 int size;
222
223 picture = avcodec_alloc_frame();
224 if (!picture)
225 return NULL;
226 size = avpicture_get_size(pix_fmt, width, height);
227 picture_buf = malloc(size);
228 if (!picture_buf) {
229 av_free(picture);
230 return NULL;
231 }
232 avpicture_fill((AVPicture *)picture, picture_buf,
233 pix_fmt, width, height);
234 return picture;
235 }
236
237 void open_video(AVFormatContext *oc, AVStream *st)
238 {
239 AVCodec *codec;
240 AVCodecContext *c;
241
242 c = &st->codec;
243
244 /* find the video encoder */
245 codec = avcodec_find_encoder(c->codec_id);
246 if (!codec) {
247 fprintf(stderr, "codec not found\n");
248 exit(1);
249 }
250
251 /* open the codec */
252 if (avcodec_open(c, codec) < 0) {
253 fprintf(stderr, "could not open codec\n");
254 exit(1);
255 }
256
257 video_outbuf = NULL;
258 if (!(oc->oformat->flags & AVFMT_RAWPICTURE)) {
259 /* allocate output buffer */
260 /* XXX: API change will be done */
261 video_outbuf_size = 200000;
262 video_outbuf = malloc(video_outbuf_size);
263 }
264
265 /* allocate the encoded raw picture */
266 picture = alloc_picture(c->pix_fmt, c->width, c->height);
267 if (!picture) {
268 fprintf(stderr, "Could not allocate picture\n");
269 exit(1);
270 }
271
272 /* if the output format is not YUV420P, then a temporary YUV420P
273 picture is needed too. It is then converted to the required
274 output format */
275 tmp_picture = NULL;
276 if (c->pix_fmt != PIX_FMT_YUV420P) {
277 tmp_picture = alloc_picture(PIX_FMT_YUV420P, c->width, c->height);
278 if (!tmp_picture) {
279 fprintf(stderr, "Could not allocate temporary picture\n");
280 exit(1);
281 }
282 }
283 }
284
285 /* prepare a dummy image */
286 void fill_yuv_image(AVFrame *pict, int frame_index, int width, int height)
287 {
288 int x, y, i;
289
290 i = frame_index;
291
292 /* Y */
293 for(y=0;y<height;y++) {
294 for(x=0;x<width;x++) {
295 pict->data[0][y * pict->linesize[0] + x] = x + y + i * 3;
296 }
297 }
298
299 /* Cb and Cr */
300 for(y=0;y<height/2;y++) {
301 for(x=0;x<width/2;x++) {
302 pict->data[1][y * pict->linesize[1] + x] = 128 + y + i * 2;
303 pict->data[2][y * pict->linesize[2] + x] = 64 + x + i * 5;
304 }
305 }
306 }
307
308 void write_video_frame(AVFormatContext *oc, AVStream *st)
309 {
310 int out_size, ret;
311 AVCodecContext *c;
312 AVFrame *picture_ptr;
313
314 c = &st->codec;
315
316 if (frame_count >= STREAM_NB_FRAMES) {
317 /* no more frame to compress. The codec has a latency of a few
318 frames if using B frames, so we get the last frames by
319 passing a NULL picture */
320 picture_ptr = NULL;
321 } else {
322 if (c->pix_fmt != PIX_FMT_YUV420P) {
323 /* as we only generate a YUV420P picture, we must convert it
324 to the codec pixel format if needed */
325 fill_yuv_image(tmp_picture, frame_count, c->width, c->height);
326 img_convert((AVPicture *)picture, c->pix_fmt,
327 (AVPicture *)tmp_picture, PIX_FMT_YUV420P,
328 c->width, c->height);
329 } else {
330 fill_yuv_image(picture, frame_count, c->width, c->height);
331 }
332 picture_ptr = picture;
333 }
334
335
336 if (oc->oformat->flags & AVFMT_RAWPICTURE) {
337 /* raw video case. The API will change slightly in the near
338 futur for that */
339 ret = av_write_frame(oc, st->index,
340 (uint8_t *)picture_ptr, sizeof(AVPicture));
341 } else {
342 /* encode the image */
343 out_size = avcodec_encode_video(c, video_outbuf, video_outbuf_size, picture_ptr);
344 /* if zero size, it means the image was buffered */
345 if (out_size != 0) {
346 /* write the compressed frame in the media file */
347 /* XXX: in case of B frames, the pts is not yet valid */
348 ret = av_write_frame(oc, st->index, video_outbuf, out_size);
349 } else {
350 ret = 0;
351 }
352 }
353 if (ret != 0) {
354 fprintf(stderr, "Error while writing video frame\n");
355 exit(1);
356 }
357 frame_count++;
358 }
359
360 void close_video(AVFormatContext *oc, AVStream *st)
361 {
362 avcodec_close(&st->codec);
363 av_free(picture->data[0]);
364 av_free(picture);
365 if (tmp_picture) {
366 av_free(tmp_picture->data[0]);
367 av_free(tmp_picture);
368 }
369 av_free(video_outbuf);
370 }
371
372 /**************************************************************/
373 /* media file output */
374
375 int main(int argc, char **argv)
376 {
377 const char *filename;
378 AVOutputFormat *fmt;
379 AVFormatContext *oc;
380 AVStream *audio_st, *video_st;
381 double audio_pts, video_pts;
382 int i;
383
384 /* initialize libavcodec, and register all codecs and formats */
385 av_register_all();
386
387 if (argc != 2) {
388 printf("usage: %s output_file\n"
389 "API example program to output a media file with libavformat.\n"
390 "The output format is automatically guessed according to the file extension.\n"
391 "Raw images can also be output by using '%%d' in the filename\n"
392 "\n", argv[0]);
393 exit(1);
394 }
395
396 filename = argv[1];
397
398 /* auto detect the output format from the name. default is
399 mpeg. */
400 fmt = guess_format(NULL, filename, NULL);
401 if (!fmt) {
402 printf("Could not deduce output format from file extension: using MPEG.\n");
403 fmt = guess_format("mpeg", NULL, NULL);
404 }
405 if (!fmt) {
406 fprintf(stderr, "Could not find suitable output format\n");
407 exit(1);
408 }
409
410 /* allocate the output media context */
411 oc = av_alloc_format_context();
412 if (!oc) {
413 fprintf(stderr, "Memory error\n");
414 exit(1);
415 }
416 oc->oformat = fmt;
417 snprintf(oc->filename, sizeof(oc->filename), "%s", filename);
418
419 /* add the audio and video streams using the default format codecs
420 and initialize the codecs */
421 video_st = NULL;
422 audio_st = NULL;
423 if (fmt->video_codec != CODEC_ID_NONE) {
424 video_st = add_video_stream(oc, fmt->video_codec);
425 }
426 if (fmt->audio_codec != CODEC_ID_NONE) {
427 audio_st = add_audio_stream(oc, fmt->audio_codec);
428 }
429
430 /* set the output parameters (must be done even if no
431 parameters). */
432 if (av_set_parameters(oc, NULL) < 0) {
433 fprintf(stderr, "Invalid output format parameters\n");
434 exit(1);
435 }
436
437 dump_format(oc, 0, filename, 1);
438
439 /* now that all the parameters are set, we can open the audio and
440 video codecs and allocate the necessary encode buffers */
441 if (video_st)
442 open_video(oc, video_st);
443 if (audio_st)
444 open_audio(oc, audio_st);
445
446 /* open the output file, if needed */
447 if (!(fmt->flags & AVFMT_NOFILE)) {
448 if (url_fopen(&oc->pb, filename, URL_WRONLY) < 0) {
449 fprintf(stderr, "Could not open '%s'\n", filename);
450 exit(1);
451 }
452 }
453
454 /* write the stream header, if any */
455 av_write_header(oc);
456
457 for(;;) {
458 /* compute current audio and video time */
459 if (audio_st)
460 audio_pts = (double)audio_st->pts.val * audio_st->time_base.num / audio_st->time_base.den;
461 else
462 audio_pts = 0.0;
463
464 if (video_st)
465 video_pts = (double)video_st->pts.val * video_st->time_base.num / video_st->time_base.den;
466 else
467 video_pts = 0.0;
468
469 if ((!audio_st || audio_pts >= STREAM_DURATION) &&
470 (!video_st || video_pts >= STREAM_DURATION))
471 break;
472
473 /* write interleaved audio and video frames */
474 if (!video_st || (video_st && audio_st && audio_pts < video_pts)) {
475 write_audio_frame(oc, audio_st);
476 } else {
477 write_video_frame(oc, video_st);
478 }
479 }
480
481 /* close each codec */
482 if (video_st)
483 close_video(oc, video_st);
484 if (audio_st)
485 close_audio(oc, audio_st);
486
487 /* write the trailer, if any */
488 av_write_trailer(oc);
489
490 /* free the streams */
491 for(i = 0; i < oc->nb_streams; i++) {
492 av_freep(&oc->streams[i]);
493 }
494
495 if (!(fmt->flags & AVFMT_NOFILE)) {
496 /* close the output file */
497 url_fclose(&oc->pb);
498 }
499
500 /* free the stream */
501 av_free(oc);
502
503 return 0;
504 }