ASF extended header parsing patch by ("Kevin Kuphal" <kevin dot kuphal at sitecity...
[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 */
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36#define STREAM_DURATION 5.0
37#define STREAM_FRAME_RATE 25 /* 25 images/s */
38#define STREAM_NB_FRAMES ((int)(STREAM_DURATION * STREAM_FRAME_RATE))
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39
40/**************************************************************/
41/* audio output */
42
e70fcf07 43float t, tincr, tincr2;
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44int16_t *samples;
45uint8_t *audio_outbuf;
46int audio_outbuf_size;
47int audio_input_frame_size;
48
49/*
50 * add an audio output stream
51 */
52AVStream *add_audio_stream(AVFormatContext *oc, int codec_id)
53{
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54 AVCodecContext *c;
55 AVStream *st;
56
57 st = av_new_stream(oc, 1);
58 if (!st) {
59 fprintf(stderr, "Could not alloc stream\n");
60 exit(1);
61 }
62
8de65d4f 63 c = &st->codec;
e70fcf07 64 c->codec_id = codec_id;
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65 c->codec_type = CODEC_TYPE_AUDIO;
66
67 /* put sample parameters */
68 c->bit_rate = 64000;
69 c->sample_rate = 44100;
70 c->channels = 2;
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71 return st;
72}
73
74void open_audio(AVFormatContext *oc, AVStream *st)
75{
76 AVCodecContext *c;
77 AVCodec *codec;
78
79 c = &st->codec;
80
81 /* find the audio encoder */
82 codec = avcodec_find_encoder(c->codec_id);
83 if (!codec) {
84 fprintf(stderr, "codec not found\n");
85 exit(1);
86 }
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87
88 /* open it */
89 if (avcodec_open(c, codec) < 0) {
90 fprintf(stderr, "could not open codec\n");
91 exit(1);
92 }
93
94 /* init signal generator */
95 t = 0;
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96 tincr = 2 * M_PI * 110.0 / c->sample_rate;
97 /* increment frequency by 110 Hz per second */
98 tincr2 = 2 * M_PI * 110.0 / c->sample_rate / c->sample_rate;
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99
100 audio_outbuf_size = 10000;
101 audio_outbuf = malloc(audio_outbuf_size);
102
103 /* ugly hack for PCM codecs (will be removed ASAP with new PCM
104 support to compute the input frame size in samples */
105 if (c->frame_size <= 1) {
106 audio_input_frame_size = audio_outbuf_size / c->channels;
107 switch(st->codec.codec_id) {
108 case CODEC_ID_PCM_S16LE:
109 case CODEC_ID_PCM_S16BE:
110 case CODEC_ID_PCM_U16LE:
111 case CODEC_ID_PCM_U16BE:
112 audio_input_frame_size >>= 1;
113 break;
114 default:
115 break;
116 }
117 } else {
118 audio_input_frame_size = c->frame_size;
119 }
120 samples = malloc(audio_input_frame_size * 2 * c->channels);
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121}
122
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123/* prepare a 16 bit dummy audio frame of 'frame_size' samples and
124 'nb_channels' channels */
125void get_audio_frame(int16_t *samples, int frame_size, int nb_channels)
126{
127 int j, i, v;
128 int16_t *q;
129
130 q = samples;
131 for(j=0;j<frame_size;j++) {
132 v = (int)(sin(t) * 10000);
133 for(i = 0; i < nb_channels; i++)
134 *q++ = v;
135 t += tincr;
136 tincr += tincr2;
137 }
138}
139
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140void write_audio_frame(AVFormatContext *oc, AVStream *st)
141{
cb750e33 142 int out_size;
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143 AVCodecContext *c;
144
145
146 c = &st->codec;
147
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148 get_audio_frame(samples, audio_input_frame_size, c->channels);
149
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150 out_size = avcodec_encode_audio(c, audio_outbuf, audio_outbuf_size, samples);
151
152 /* write the compressed frame in the media file */
153 if (av_write_frame(oc, st->index, audio_outbuf, out_size) != 0) {
154 fprintf(stderr, "Error while writing audio frame\n");
155 exit(1);
156 }
157}
158
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159void close_audio(AVFormatContext *oc, AVStream *st)
160{
161 avcodec_close(&st->codec);
162
163 av_free(samples);
164 av_free(audio_outbuf);
165}
166
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167/**************************************************************/
168/* video output */
169
e70fcf07 170AVFrame *picture, *tmp_picture;
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171uint8_t *video_outbuf;
172int frame_count, video_outbuf_size;
173
174/* add a video output stream */
175AVStream *add_video_stream(AVFormatContext *oc, int codec_id)
176{
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177 AVCodecContext *c;
178 AVStream *st;
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179
180 st = av_new_stream(oc, 0);
181 if (!st) {
182 fprintf(stderr, "Could not alloc stream\n");
183 exit(1);
184 }
185
8de65d4f 186 c = &st->codec;
e70fcf07 187 c->codec_id = codec_id;
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188 c->codec_type = CODEC_TYPE_VIDEO;
189
190 /* put sample parameters */
191 c->bit_rate = 400000;
192 /* resolution must be a multiple of two */
193 c->width = 352;
194 c->height = 288;
195 /* frames per second */
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196 c->frame_rate = STREAM_FRAME_RATE;
197 c->frame_rate_base = 1;
198 c->gop_size = 12; /* emit one intra frame every twelve frames at most */
199 if (c->codec_id == CODEC_ID_MPEG1VIDEO ||
200 c->codec_id == CODEC_ID_MPEG2VIDEO) {
201 /* just for testing, we also add B frames */
202 c->max_b_frames = 2;
203 }
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204 return st;
205}
206
207AVFrame *alloc_picture(int pix_fmt, int width, int height)
208{
209 AVFrame *picture;
210 uint8_t *picture_buf;
211 int size;
212
213 picture = avcodec_alloc_frame();
214 if (!picture)
215 return NULL;
216 size = avpicture_get_size(pix_fmt, width, height);
217 picture_buf = malloc(size);
218 if (!picture_buf) {
219 av_free(picture);
220 return NULL;
221 }
222 avpicture_fill((AVPicture *)picture, picture_buf,
223 pix_fmt, width, height);
224 return picture;
225}
226
227void open_video(AVFormatContext *oc, AVStream *st)
228{
229 AVCodec *codec;
230 AVCodecContext *c;
231
232 c = &st->codec;
233
234 /* find the video encoder */
235 codec = avcodec_find_encoder(c->codec_id);
236 if (!codec) {
237 fprintf(stderr, "codec not found\n");
238 exit(1);
239 }
240
241 /* open the codec */
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242 if (avcodec_open(c, codec) < 0) {
243 fprintf(stderr, "could not open codec\n");
244 exit(1);
245 }
246
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247 video_outbuf = NULL;
248 if (!(oc->oformat->flags & AVFMT_RAWPICTURE)) {
249 /* allocate output buffer */
250 /* XXX: API change will be done */
251 video_outbuf_size = 200000;
252 video_outbuf = malloc(video_outbuf_size);
253 }
8de65d4f 254
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255 /* allocate the encoded raw picture */
256 picture = alloc_picture(c->pix_fmt, c->width, c->height);
257 if (!picture) {
258 fprintf(stderr, "Could not allocate picture\n");
259 exit(1);
260 }
8de65d4f 261
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262 /* if the output format is not YUV420P, then a temporary YUV420P
263 picture is needed too. It is then converted to the required
264 output format */
265 tmp_picture = NULL;
266 if (c->pix_fmt != PIX_FMT_YUV420P) {
267 tmp_picture = alloc_picture(PIX_FMT_YUV420P, c->width, c->height);
268 if (!tmp_picture) {
269 fprintf(stderr, "Could not allocate temporary picture\n");
270 exit(1);
271 }
272 }
273}
8de65d4f 274
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275/* prepare a dummy image */
276void fill_yuv_image(AVFrame *pict, int frame_index, int width, int height)
8de65d4f 277{
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278 int x, y, i;
279
280 i = frame_index;
8de65d4f 281
8de65d4f 282 /* Y */
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283 for(y=0;y<height;y++) {
284 for(x=0;x<width;x++) {
285 pict->data[0][y * pict->linesize[0] + x] = x + y + i * 3;
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286 }
287 }
288
289 /* Cb and Cr */
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290 for(y=0;y<height/2;y++) {
291 for(x=0;x<width/2;x++) {
292 pict->data[1][y * pict->linesize[1] + x] = 128 + y + i * 2;
293 pict->data[2][y * pict->linesize[2] + x] = 64 + x + i * 5;
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294 }
295 }
e70fcf07 296}
8de65d4f 297
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298void write_video_frame(AVFormatContext *oc, AVStream *st)
299{
300 int out_size, ret;
301 AVCodecContext *c;
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302 AVFrame *picture_ptr;
303
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304 c = &st->codec;
305
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306 if (frame_count >= STREAM_NB_FRAMES) {
307 /* no more frame to compress. The codec has a latency of a few
308 frames if using B frames, so we get the last frames by
309 passing a NULL picture */
310 picture_ptr = NULL;
e70fcf07 311 } else {
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312 if (c->pix_fmt != PIX_FMT_YUV420P) {
313 /* as we only generate a YUV420P picture, we must convert it
314 to the codec pixel format if needed */
315 fill_yuv_image(tmp_picture, frame_count, c->width, c->height);
316 img_convert((AVPicture *)picture, c->pix_fmt,
317 (AVPicture *)tmp_picture, PIX_FMT_YUV420P,
318 c->width, c->height);
319 } else {
320 fill_yuv_image(picture, frame_count, c->width, c->height);
321 }
322 picture_ptr = picture;
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323 }
324
325
326 if (oc->oformat->flags & AVFMT_RAWPICTURE) {
327 /* raw video case. The API will change slightly in the near
328 futur for that */
329 ret = av_write_frame(oc, st->index,
cb0c448a 330 (uint8_t *)picture_ptr, sizeof(AVPicture));
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331 } else {
332 /* encode the image */
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333 out_size = avcodec_encode_video(c, video_outbuf, video_outbuf_size, picture_ptr);
334 /* if zero size, it means the image was buffered */
335 if (out_size != 0) {
336 /* write the compressed frame in the media file */
337 /* XXX: in case of B frames, the pts is not yet valid */
338 ret = av_write_frame(oc, st->index, video_outbuf, out_size);
339 } else {
340 ret = 0;
341 }
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342 }
343 if (ret != 0) {
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344 fprintf(stderr, "Error while writing video frame\n");
345 exit(1);
346 }
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347 frame_count++;
348}
349
350void close_video(AVFormatContext *oc, AVStream *st)
351{
352 avcodec_close(&st->codec);
353 av_free(picture->data[0]);
354 av_free(picture);
355 if (tmp_picture) {
356 av_free(tmp_picture->data[0]);
357 av_free(tmp_picture);
358 }
359 av_free(video_outbuf);
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360}
361
362/**************************************************************/
363/* media file output */
364
365int main(int argc, char **argv)
366{
367 const char *filename;
368 AVOutputFormat *fmt;
369 AVFormatContext *oc;
e70fcf07 370 AVStream *audio_st, *video_st;
8de65d4f 371 double audio_pts, video_pts;
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372 int i;
373
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374 /* initialize libavcodec, and register all codecs and formats */
375 av_register_all();
376
377 if (argc != 2) {
378 printf("usage: %s output_file\n"
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379 "API example program to output a media file with libavformat.\n"
380 "The output format is automatically guessed according to the file extension.\n"
381 "Raw images can also be output by using '%%d' in the filename\n"
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382 "\n", argv[0]);
383 exit(1);
384 }
385
386 filename = argv[1];
387
388 /* auto detect the output format from the name. default is
389 mpeg. */
390 fmt = guess_format(NULL, filename, NULL);
391 if (!fmt) {
392 printf("Could not deduce output format from file extension: using MPEG.\n");
393 fmt = guess_format("mpeg", NULL, NULL);
394 }
395 if (!fmt) {
396 fprintf(stderr, "Could not find suitable output format\n");
397 exit(1);
398 }
399
400 /* allocate the output media context */
401 oc = av_mallocz(sizeof(AVFormatContext));
402 if (!oc) {
403 fprintf(stderr, "Memory error\n");
404 exit(1);
405 }
406 oc->oformat = fmt;
e70fcf07 407 snprintf(oc->filename, sizeof(oc->filename), "%s", filename);
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408
409 /* add the audio and video streams using the default format codecs
410 and initialize the codecs */
411 video_st = NULL;
412 audio_st = NULL;
413 if (fmt->video_codec != CODEC_ID_NONE) {
414 video_st = add_video_stream(oc, fmt->video_codec);
415 }
416 if (fmt->audio_codec != CODEC_ID_NONE) {
417 audio_st = add_audio_stream(oc, fmt->audio_codec);
418 }
419
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420 /* set the output parameters (must be done even if no
421 parameters). */
422 if (av_set_parameters(oc, NULL) < 0) {
423 fprintf(stderr, "Invalid output format parameters\n");
424 exit(1);
425 }
426
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427 dump_format(oc, 0, filename, 1);
428
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429 /* now that all the parameters are set, we can open the audio and
430 video codecs and allocate the necessary encode buffers */
431 if (video_st)
432 open_video(oc, video_st);
433 if (audio_st)
434 open_audio(oc, audio_st);
435
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436 /* open the output file, if needed */
437 if (!(fmt->flags & AVFMT_NOFILE)) {
438 if (url_fopen(&oc->pb, filename, URL_WRONLY) < 0) {
439 fprintf(stderr, "Could not open '%s'\n", filename);
440 exit(1);
441 }
442 }
443
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444 /* write the stream header, if any */
445 av_write_header(oc);
446
447 for(;;) {
448 /* compute current audio and video time */
449 if (audio_st)
450 audio_pts = (double)audio_st->pts.val * oc->pts_num / oc->pts_den;
451 else
452 audio_pts = 0.0;
453
454 if (video_st)
455 video_pts = (double)video_st->pts.val * oc->pts_num / oc->pts_den;
456 else
457 video_pts = 0.0;
458
459 if ((!audio_st || audio_pts >= STREAM_DURATION) &&
460 (!video_st || video_pts >= STREAM_DURATION))
461 break;
462
463 /* write interleaved audio and video frames */
e70fcf07 464 if (!video_st || (video_st && audio_st && audio_pts < video_pts)) {
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465 write_audio_frame(oc, audio_st);
466 } else {
467 write_video_frame(oc, video_st);
468 }
469 }
470
471 /* close each codec */
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472 if (video_st)
473 close_video(oc, video_st);
474 if (audio_st)
475 close_audio(oc, audio_st);
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476
477 /* write the trailer, if any */
478 av_write_trailer(oc);
479
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480 /* free the streams */
481 for(i = 0; i < oc->nb_streams; i++) {
482 av_freep(&oc->streams[i]);
483 }
484
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485 if (!(fmt->flags & AVFMT_NOFILE)) {
486 /* close the output file */
487 url_fclose(&oc->pb);
488 }
489
490 /* free the stream */
491 av_free(oc);
492
493 return 0;
494}