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[libav.git] / output_example.c
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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 <math.h>
28
264cb2b8
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29#ifndef M_PI
30#define M_PI 3.1415926535897931
31#endif
32
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33#include "avformat.h"
34
35/* 5 seconds stream duration */
36#define STREAM_DURATION 5.0
37
38
39/**************************************************************/
40/* audio output */
41
e70fcf07 42float t, tincr, tincr2;
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43int16_t *samples;
44uint8_t *audio_outbuf;
45int audio_outbuf_size;
46int audio_input_frame_size;
47
48/*
49 * add an audio output stream
50 */
51AVStream *add_audio_stream(AVFormatContext *oc, int codec_id)
52{
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53 AVCodecContext *c;
54 AVStream *st;
55
56 st = av_new_stream(oc, 1);
57 if (!st) {
58 fprintf(stderr, "Could not alloc stream\n");
59 exit(1);
60 }
61
8de65d4f 62 c = &st->codec;
e70fcf07 63 c->codec_id = codec_id;
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64 c->codec_type = CODEC_TYPE_AUDIO;
65
66 /* put sample parameters */
67 c->bit_rate = 64000;
68 c->sample_rate = 44100;
69 c->channels = 2;
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70 return st;
71}
72
73void open_audio(AVFormatContext *oc, AVStream *st)
74{
75 AVCodecContext *c;
76 AVCodec *codec;
77
78 c = &st->codec;
79
80 /* find the audio encoder */
81 codec = avcodec_find_encoder(c->codec_id);
82 if (!codec) {
83 fprintf(stderr, "codec not found\n");
84 exit(1);
85 }
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86
87 /* open it */
88 if (avcodec_open(c, codec) < 0) {
89 fprintf(stderr, "could not open codec\n");
90 exit(1);
91 }
92
93 /* init signal generator */
94 t = 0;
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95 tincr = 2 * M_PI * 110.0 / c->sample_rate;
96 /* increment frequency by 110 Hz per second */
97 tincr2 = 2 * M_PI * 110.0 / c->sample_rate / c->sample_rate;
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98
99 audio_outbuf_size = 10000;
100 audio_outbuf = malloc(audio_outbuf_size);
101
102 /* ugly hack for PCM codecs (will be removed ASAP with new PCM
103 support to compute the input frame size in samples */
104 if (c->frame_size <= 1) {
105 audio_input_frame_size = audio_outbuf_size / c->channels;
106 switch(st->codec.codec_id) {
107 case CODEC_ID_PCM_S16LE:
108 case CODEC_ID_PCM_S16BE:
109 case CODEC_ID_PCM_U16LE:
110 case CODEC_ID_PCM_U16BE:
111 audio_input_frame_size >>= 1;
112 break;
113 default:
114 break;
115 }
116 } else {
117 audio_input_frame_size = c->frame_size;
118 }
119 samples = malloc(audio_input_frame_size * 2 * c->channels);
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120}
121
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122/* prepare a 16 bit dummy audio frame of 'frame_size' samples and
123 'nb_channels' channels */
124void get_audio_frame(int16_t *samples, int frame_size, int nb_channels)
125{
126 int j, i, v;
127 int16_t *q;
128
129 q = samples;
130 for(j=0;j<frame_size;j++) {
131 v = (int)(sin(t) * 10000);
132 for(i = 0; i < nb_channels; i++)
133 *q++ = v;
134 t += tincr;
135 tincr += tincr2;
136 }
137}
138
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139void write_audio_frame(AVFormatContext *oc, AVStream *st)
140{
cb750e33 141 int out_size;
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142 AVCodecContext *c;
143
144
145 c = &st->codec;
146
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147 get_audio_frame(samples, audio_input_frame_size, c->channels);
148
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149 out_size = avcodec_encode_audio(c, audio_outbuf, audio_outbuf_size, samples);
150
151 /* write the compressed frame in the media file */
152 if (av_write_frame(oc, st->index, audio_outbuf, out_size) != 0) {
153 fprintf(stderr, "Error while writing audio frame\n");
154 exit(1);
155 }
156}
157
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158void close_audio(AVFormatContext *oc, AVStream *st)
159{
160 avcodec_close(&st->codec);
161
162 av_free(samples);
163 av_free(audio_outbuf);
164}
165
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166/**************************************************************/
167/* video output */
168
e70fcf07 169AVFrame *picture, *tmp_picture;
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170uint8_t *video_outbuf;
171int frame_count, video_outbuf_size;
172
173/* add a video output stream */
174AVStream *add_video_stream(AVFormatContext *oc, int codec_id)
175{
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176 AVCodecContext *c;
177 AVStream *st;
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178
179 st = av_new_stream(oc, 0);
180 if (!st) {
181 fprintf(stderr, "Could not alloc stream\n");
182 exit(1);
183 }
184
8de65d4f 185 c = &st->codec;
e70fcf07 186 c->codec_id = codec_id;
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187 c->codec_type = CODEC_TYPE_VIDEO;
188
189 /* put sample parameters */
190 c->bit_rate = 400000;
191 /* resolution must be a multiple of two */
192 c->width = 352;
193 c->height = 288;
194 /* frames per second */
195 c->frame_rate = 25;
196 c->frame_rate_base= 1;
197 c->gop_size = 12; /* emit one intra frame every twelve frames */
198
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199 return st;
200}
201
202AVFrame *alloc_picture(int pix_fmt, int width, int height)
203{
204 AVFrame *picture;
205 uint8_t *picture_buf;
206 int size;
207
208 picture = avcodec_alloc_frame();
209 if (!picture)
210 return NULL;
211 size = avpicture_get_size(pix_fmt, width, height);
212 picture_buf = malloc(size);
213 if (!picture_buf) {
214 av_free(picture);
215 return NULL;
216 }
217 avpicture_fill((AVPicture *)picture, picture_buf,
218 pix_fmt, width, height);
219 return picture;
220}
221
222void open_video(AVFormatContext *oc, AVStream *st)
223{
224 AVCodec *codec;
225 AVCodecContext *c;
226
227 c = &st->codec;
228
229 /* find the video encoder */
230 codec = avcodec_find_encoder(c->codec_id);
231 if (!codec) {
232 fprintf(stderr, "codec not found\n");
233 exit(1);
234 }
235
236 /* open the codec */
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237 if (avcodec_open(c, codec) < 0) {
238 fprintf(stderr, "could not open codec\n");
239 exit(1);
240 }
241
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242 video_outbuf = NULL;
243 if (!(oc->oformat->flags & AVFMT_RAWPICTURE)) {
244 /* allocate output buffer */
245 /* XXX: API change will be done */
246 video_outbuf_size = 200000;
247 video_outbuf = malloc(video_outbuf_size);
248 }
8de65d4f 249
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250 /* allocate the encoded raw picture */
251 picture = alloc_picture(c->pix_fmt, c->width, c->height);
252 if (!picture) {
253 fprintf(stderr, "Could not allocate picture\n");
254 exit(1);
255 }
8de65d4f 256
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257 /* if the output format is not YUV420P, then a temporary YUV420P
258 picture is needed too. It is then converted to the required
259 output format */
260 tmp_picture = NULL;
261 if (c->pix_fmt != PIX_FMT_YUV420P) {
262 tmp_picture = alloc_picture(PIX_FMT_YUV420P, c->width, c->height);
263 if (!tmp_picture) {
264 fprintf(stderr, "Could not allocate temporary picture\n");
265 exit(1);
266 }
267 }
268}
8de65d4f 269
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270/* prepare a dummy image */
271void fill_yuv_image(AVFrame *pict, int frame_index, int width, int height)
8de65d4f 272{
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273 int x, y, i;
274
275 i = frame_index;
8de65d4f 276
8de65d4f 277 /* Y */
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278 for(y=0;y<height;y++) {
279 for(x=0;x<width;x++) {
280 pict->data[0][y * pict->linesize[0] + x] = x + y + i * 3;
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281 }
282 }
283
284 /* Cb and Cr */
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285 for(y=0;y<height/2;y++) {
286 for(x=0;x<width/2;x++) {
287 pict->data[1][y * pict->linesize[1] + x] = 128 + y + i * 2;
288 pict->data[2][y * pict->linesize[2] + x] = 64 + x + i * 5;
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289 }
290 }
e70fcf07 291}
8de65d4f 292
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293void write_video_frame(AVFormatContext *oc, AVStream *st)
294{
295 int out_size, ret;
296 AVCodecContext *c;
8de65d4f 297
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298 c = &st->codec;
299
300 if (c->pix_fmt != PIX_FMT_YUV420P) {
301 /* as we only generate a YUV420P picture, we must convert it
302 to the codec pixel format if needed */
303 fill_yuv_image(tmp_picture, frame_count, c->width, c->height);
304 img_convert((AVPicture *)picture, c->pix_fmt,
305 (AVPicture *)tmp_picture, PIX_FMT_YUV420P,
306 c->width, c->height);
307 } else {
308 fill_yuv_image(picture, frame_count, c->width, c->height);
309 }
310
311
312 if (oc->oformat->flags & AVFMT_RAWPICTURE) {
313 /* raw video case. The API will change slightly in the near
314 futur for that */
315 ret = av_write_frame(oc, st->index,
316 (uint8_t *)picture, sizeof(AVPicture));
317 } else {
318 /* encode the image */
319 out_size = avcodec_encode_video(c, video_outbuf, video_outbuf_size, picture);
320
321 /* write the compressed frame in the media file */
322 ret = av_write_frame(oc, st->index, video_outbuf, out_size);
323 }
324 if (ret != 0) {
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325 fprintf(stderr, "Error while writing video frame\n");
326 exit(1);
327 }
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328 frame_count++;
329}
330
331void close_video(AVFormatContext *oc, AVStream *st)
332{
333 avcodec_close(&st->codec);
334 av_free(picture->data[0]);
335 av_free(picture);
336 if (tmp_picture) {
337 av_free(tmp_picture->data[0]);
338 av_free(tmp_picture);
339 }
340 av_free(video_outbuf);
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341}
342
343/**************************************************************/
344/* media file output */
345
346int main(int argc, char **argv)
347{
348 const char *filename;
349 AVOutputFormat *fmt;
350 AVFormatContext *oc;
e70fcf07 351 AVStream *audio_st, *video_st;
8de65d4f 352 double audio_pts, video_pts;
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353 int i;
354
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355 /* initialize libavcodec, and register all codecs and formats */
356 av_register_all();
357
358 if (argc != 2) {
359 printf("usage: %s output_file\n"
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360 "API example program to output a media file with libavformat.\n"
361 "The output format is automatically guessed according to the file extension.\n"
362 "Raw images can also be output by using '%%d' in the filename\n"
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363 "\n", argv[0]);
364 exit(1);
365 }
366
367 filename = argv[1];
368
369 /* auto detect the output format from the name. default is
370 mpeg. */
371 fmt = guess_format(NULL, filename, NULL);
372 if (!fmt) {
373 printf("Could not deduce output format from file extension: using MPEG.\n");
374 fmt = guess_format("mpeg", NULL, NULL);
375 }
376 if (!fmt) {
377 fprintf(stderr, "Could not find suitable output format\n");
378 exit(1);
379 }
380
381 /* allocate the output media context */
382 oc = av_mallocz(sizeof(AVFormatContext));
383 if (!oc) {
384 fprintf(stderr, "Memory error\n");
385 exit(1);
386 }
387 oc->oformat = fmt;
e70fcf07 388 snprintf(oc->filename, sizeof(oc->filename), "%s", filename);
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389
390 /* add the audio and video streams using the default format codecs
391 and initialize the codecs */
392 video_st = NULL;
393 audio_st = NULL;
394 if (fmt->video_codec != CODEC_ID_NONE) {
395 video_st = add_video_stream(oc, fmt->video_codec);
396 }
397 if (fmt->audio_codec != CODEC_ID_NONE) {
398 audio_st = add_audio_stream(oc, fmt->audio_codec);
399 }
400
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401 /* set the output parameters (must be done even if no
402 parameters). */
403 if (av_set_parameters(oc, NULL) < 0) {
404 fprintf(stderr, "Invalid output format parameters\n");
405 exit(1);
406 }
407
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408 dump_format(oc, 0, filename, 1);
409
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410 /* now that all the parameters are set, we can open the audio and
411 video codecs and allocate the necessary encode buffers */
412 if (video_st)
413 open_video(oc, video_st);
414 if (audio_st)
415 open_audio(oc, audio_st);
416
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417 /* open the output file, if needed */
418 if (!(fmt->flags & AVFMT_NOFILE)) {
419 if (url_fopen(&oc->pb, filename, URL_WRONLY) < 0) {
420 fprintf(stderr, "Could not open '%s'\n", filename);
421 exit(1);
422 }
423 }
424
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425 /* write the stream header, if any */
426 av_write_header(oc);
427
428 for(;;) {
429 /* compute current audio and video time */
430 if (audio_st)
431 audio_pts = (double)audio_st->pts.val * oc->pts_num / oc->pts_den;
432 else
433 audio_pts = 0.0;
434
435 if (video_st)
436 video_pts = (double)video_st->pts.val * oc->pts_num / oc->pts_den;
437 else
438 video_pts = 0.0;
439
440 if ((!audio_st || audio_pts >= STREAM_DURATION) &&
441 (!video_st || video_pts >= STREAM_DURATION))
442 break;
443
444 /* write interleaved audio and video frames */
e70fcf07 445 if (!video_st || (video_st && audio_st && audio_pts < video_pts)) {
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446 write_audio_frame(oc, audio_st);
447 } else {
448 write_video_frame(oc, video_st);
449 }
450 }
451
452 /* close each codec */
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453 if (video_st)
454 close_video(oc, video_st);
455 if (audio_st)
456 close_audio(oc, audio_st);
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457
458 /* write the trailer, if any */
459 av_write_trailer(oc);
460
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461 /* free the streams */
462 for(i = 0; i < oc->nb_streams; i++) {
463 av_freep(&oc->streams[i]);
464 }
465
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466 if (!(fmt->flags & AVFMT_NOFILE)) {
467 /* close the output file */
468 url_fclose(&oc->pb);
469 }
470
471 /* free the stream */
472 av_free(oc);
473
474 return 0;
475}