tests/tools/examples: Replace direct exit() calls by return.
[libav.git] / libavformat / output-example.c
1 /*
2 * Copyright (c) 2003 Fabrice Bellard
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a copy
5 * of this software and associated documentation files (the "Software"), to deal
6 * in the Software without restriction, including without limitation the rights
7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
8 * copies of the Software, and to permit persons to whom the Software is
9 * furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
13 *
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
17 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
20 * THE SOFTWARE.
21 */
22
23 /**
24 * @file
25 * libavformat API example.
26 *
27 * @example libavformat/output-example.c
28 * Output a media file in any supported libavformat format.
29 * The default codecs are used.
30 */
31
32 #include <stdlib.h>
33 #include <stdio.h>
34 #include <string.h>
35 #include <math.h>
36
37 #include "libavutil/mathematics.h"
38 #include "libavformat/avformat.h"
39 #include "libswscale/swscale.h"
40
41 #undef exit
42
43 /* 5 seconds stream duration */
44 #define STREAM_DURATION 5.0
45 #define STREAM_FRAME_RATE 25 /* 25 images/s */
46 #define STREAM_NB_FRAMES ((int)(STREAM_DURATION * STREAM_FRAME_RATE))
47 #define STREAM_PIX_FMT PIX_FMT_YUV420P /* default pix_fmt */
48
49 static int sws_flags = SWS_BICUBIC;
50
51 /**************************************************************/
52 /* audio output */
53
54 float t, tincr, tincr2;
55 int16_t *samples;
56 uint8_t *audio_outbuf;
57 int audio_outbuf_size;
58 int audio_input_frame_size;
59
60 /*
61 * add an audio output stream
62 */
63 static AVStream *add_audio_stream(AVFormatContext *oc, enum CodecID codec_id)
64 {
65 AVCodecContext *c;
66 AVStream *st;
67
68 st = av_new_stream(oc, 1);
69 if (!st) {
70 fprintf(stderr, "Could not alloc stream\n");
71 exit(1);
72 }
73
74 c = st->codec;
75 c->codec_id = codec_id;
76 c->codec_type = AVMEDIA_TYPE_AUDIO;
77
78 /* put sample parameters */
79 c->sample_fmt = AV_SAMPLE_FMT_S16;
80 c->bit_rate = 64000;
81 c->sample_rate = 44100;
82 c->channels = 2;
83
84 // some formats want stream headers to be separate
85 if(oc->oformat->flags & AVFMT_GLOBALHEADER)
86 c->flags |= CODEC_FLAG_GLOBAL_HEADER;
87
88 return st;
89 }
90
91 static void open_audio(AVFormatContext *oc, AVStream *st)
92 {
93 AVCodecContext *c;
94 AVCodec *codec;
95
96 c = st->codec;
97
98 /* find the audio encoder */
99 codec = avcodec_find_encoder(c->codec_id);
100 if (!codec) {
101 fprintf(stderr, "codec not found\n");
102 exit(1);
103 }
104
105 /* open it */
106 if (avcodec_open(c, codec) < 0) {
107 fprintf(stderr, "could not open codec\n");
108 exit(1);
109 }
110
111 /* init signal generator */
112 t = 0;
113 tincr = 2 * M_PI * 110.0 / c->sample_rate;
114 /* increment frequency by 110 Hz per second */
115 tincr2 = 2 * M_PI * 110.0 / c->sample_rate / c->sample_rate;
116
117 audio_outbuf_size = 10000;
118 audio_outbuf = av_malloc(audio_outbuf_size);
119
120 /* ugly hack for PCM codecs (will be removed ASAP with new PCM
121 support to compute the input frame size in samples */
122 if (c->frame_size <= 1) {
123 audio_input_frame_size = audio_outbuf_size / c->channels;
124 switch(st->codec->codec_id) {
125 case CODEC_ID_PCM_S16LE:
126 case CODEC_ID_PCM_S16BE:
127 case CODEC_ID_PCM_U16LE:
128 case CODEC_ID_PCM_U16BE:
129 audio_input_frame_size >>= 1;
130 break;
131 default:
132 break;
133 }
134 } else {
135 audio_input_frame_size = c->frame_size;
136 }
137 samples = av_malloc(audio_input_frame_size * 2 * c->channels);
138 }
139
140 /* prepare a 16 bit dummy audio frame of 'frame_size' samples and
141 'nb_channels' channels */
142 static void get_audio_frame(int16_t *samples, int frame_size, int nb_channels)
143 {
144 int j, i, v;
145 int16_t *q;
146
147 q = samples;
148 for(j=0;j<frame_size;j++) {
149 v = (int)(sin(t) * 10000);
150 for(i = 0; i < nb_channels; i++)
151 *q++ = v;
152 t += tincr;
153 tincr += tincr2;
154 }
155 }
156
157 static void write_audio_frame(AVFormatContext *oc, AVStream *st)
158 {
159 AVCodecContext *c;
160 AVPacket pkt;
161 av_init_packet(&pkt);
162
163 c = st->codec;
164
165 get_audio_frame(samples, audio_input_frame_size, c->channels);
166
167 pkt.size= avcodec_encode_audio(c, audio_outbuf, audio_outbuf_size, samples);
168
169 if (c->coded_frame && c->coded_frame->pts != AV_NOPTS_VALUE)
170 pkt.pts= av_rescale_q(c->coded_frame->pts, c->time_base, st->time_base);
171 pkt.flags |= AV_PKT_FLAG_KEY;
172 pkt.stream_index= st->index;
173 pkt.data= audio_outbuf;
174
175 /* write the compressed frame in the media file */
176 if (av_interleaved_write_frame(oc, &pkt) != 0) {
177 fprintf(stderr, "Error while writing audio frame\n");
178 exit(1);
179 }
180 }
181
182 static void close_audio(AVFormatContext *oc, AVStream *st)
183 {
184 avcodec_close(st->codec);
185
186 av_free(samples);
187 av_free(audio_outbuf);
188 }
189
190 /**************************************************************/
191 /* video output */
192
193 AVFrame *picture, *tmp_picture;
194 uint8_t *video_outbuf;
195 int frame_count, video_outbuf_size;
196
197 /* add a video output stream */
198 static AVStream *add_video_stream(AVFormatContext *oc, enum CodecID codec_id)
199 {
200 AVCodecContext *c;
201 AVStream *st;
202
203 st = avformat_new_stream(oc, NULL);
204 if (!st) {
205 fprintf(stderr, "Could not alloc stream\n");
206 exit(1);
207 }
208
209 c = st->codec;
210 c->codec_id = codec_id;
211 c->codec_type = AVMEDIA_TYPE_VIDEO;
212
213 /* put sample parameters */
214 c->bit_rate = 400000;
215 /* resolution must be a multiple of two */
216 c->width = 352;
217 c->height = 288;
218 /* time base: this is the fundamental unit of time (in seconds) in terms
219 of which frame timestamps are represented. for fixed-fps content,
220 timebase should be 1/framerate and timestamp increments should be
221 identically 1. */
222 c->time_base.den = STREAM_FRAME_RATE;
223 c->time_base.num = 1;
224 c->gop_size = 12; /* emit one intra frame every twelve frames at most */
225 c->pix_fmt = STREAM_PIX_FMT;
226 if (c->codec_id == CODEC_ID_MPEG2VIDEO) {
227 /* just for testing, we also add B frames */
228 c->max_b_frames = 2;
229 }
230 if (c->codec_id == CODEC_ID_MPEG1VIDEO){
231 /* Needed to avoid using macroblocks in which some coeffs overflow.
232 This does not happen with normal video, it just happens here as
233 the motion of the chroma plane does not match the luma plane. */
234 c->mb_decision=2;
235 }
236 // some formats want stream headers to be separate
237 if(oc->oformat->flags & AVFMT_GLOBALHEADER)
238 c->flags |= CODEC_FLAG_GLOBAL_HEADER;
239
240 return st;
241 }
242
243 static AVFrame *alloc_picture(enum PixelFormat pix_fmt, int width, int height)
244 {
245 AVFrame *picture;
246 uint8_t *picture_buf;
247 int size;
248
249 picture = avcodec_alloc_frame();
250 if (!picture)
251 return NULL;
252 size = avpicture_get_size(pix_fmt, width, height);
253 picture_buf = av_malloc(size);
254 if (!picture_buf) {
255 av_free(picture);
256 return NULL;
257 }
258 avpicture_fill((AVPicture *)picture, picture_buf,
259 pix_fmt, width, height);
260 return picture;
261 }
262
263 static void open_video(AVFormatContext *oc, AVStream *st)
264 {
265 AVCodec *codec;
266 AVCodecContext *c;
267
268 c = st->codec;
269
270 /* find the video encoder */
271 codec = avcodec_find_encoder(c->codec_id);
272 if (!codec) {
273 fprintf(stderr, "codec not found\n");
274 exit(1);
275 }
276
277 /* open the codec */
278 if (avcodec_open(c, codec) < 0) {
279 fprintf(stderr, "could not open codec\n");
280 exit(1);
281 }
282
283 video_outbuf = NULL;
284 if (!(oc->oformat->flags & AVFMT_RAWPICTURE)) {
285 /* allocate output buffer */
286 /* XXX: API change will be done */
287 /* buffers passed into lav* can be allocated any way you prefer,
288 as long as they're aligned enough for the architecture, and
289 they're freed appropriately (such as using av_free for buffers
290 allocated with av_malloc) */
291 video_outbuf_size = 200000;
292 video_outbuf = av_malloc(video_outbuf_size);
293 }
294
295 /* allocate the encoded raw picture */
296 picture = alloc_picture(c->pix_fmt, c->width, c->height);
297 if (!picture) {
298 fprintf(stderr, "Could not allocate picture\n");
299 exit(1);
300 }
301
302 /* if the output format is not YUV420P, then a temporary YUV420P
303 picture is needed too. It is then converted to the required
304 output format */
305 tmp_picture = NULL;
306 if (c->pix_fmt != PIX_FMT_YUV420P) {
307 tmp_picture = alloc_picture(PIX_FMT_YUV420P, c->width, c->height);
308 if (!tmp_picture) {
309 fprintf(stderr, "Could not allocate temporary picture\n");
310 exit(1);
311 }
312 }
313 }
314
315 /* prepare a dummy image */
316 static void fill_yuv_image(AVFrame *pict, int frame_index, int width, int height)
317 {
318 int x, y, i;
319
320 i = frame_index;
321
322 /* Y */
323 for(y=0;y<height;y++) {
324 for(x=0;x<width;x++) {
325 pict->data[0][y * pict->linesize[0] + x] = x + y + i * 3;
326 }
327 }
328
329 /* Cb and Cr */
330 for(y=0;y<height/2;y++) {
331 for(x=0;x<width/2;x++) {
332 pict->data[1][y * pict->linesize[1] + x] = 128 + y + i * 2;
333 pict->data[2][y * pict->linesize[2] + x] = 64 + x + i * 5;
334 }
335 }
336 }
337
338 static void write_video_frame(AVFormatContext *oc, AVStream *st)
339 {
340 int out_size, ret;
341 AVCodecContext *c;
342 static struct SwsContext *img_convert_ctx;
343
344 c = st->codec;
345
346 if (frame_count >= STREAM_NB_FRAMES) {
347 /* no more frame to compress. The codec has a latency of a few
348 frames if using B frames, so we get the last frames by
349 passing the same picture again */
350 } else {
351 if (c->pix_fmt != PIX_FMT_YUV420P) {
352 /* as we only generate a YUV420P picture, we must convert it
353 to the codec pixel format if needed */
354 if (img_convert_ctx == NULL) {
355 img_convert_ctx = sws_getContext(c->width, c->height,
356 PIX_FMT_YUV420P,
357 c->width, c->height,
358 c->pix_fmt,
359 sws_flags, NULL, NULL, NULL);
360 if (img_convert_ctx == NULL) {
361 fprintf(stderr, "Cannot initialize the conversion context\n");
362 exit(1);
363 }
364 }
365 fill_yuv_image(tmp_picture, frame_count, c->width, c->height);
366 sws_scale(img_convert_ctx, tmp_picture->data, tmp_picture->linesize,
367 0, c->height, picture->data, picture->linesize);
368 } else {
369 fill_yuv_image(picture, frame_count, c->width, c->height);
370 }
371 }
372
373
374 if (oc->oformat->flags & AVFMT_RAWPICTURE) {
375 /* raw video case. The API will change slightly in the near
376 futur for that */
377 AVPacket pkt;
378 av_init_packet(&pkt);
379
380 pkt.flags |= AV_PKT_FLAG_KEY;
381 pkt.stream_index= st->index;
382 pkt.data= (uint8_t *)picture;
383 pkt.size= sizeof(AVPicture);
384
385 ret = av_interleaved_write_frame(oc, &pkt);
386 } else {
387 /* encode the image */
388 out_size = avcodec_encode_video(c, video_outbuf, video_outbuf_size, picture);
389 /* if zero size, it means the image was buffered */
390 if (out_size > 0) {
391 AVPacket pkt;
392 av_init_packet(&pkt);
393
394 if (c->coded_frame->pts != AV_NOPTS_VALUE)
395 pkt.pts= av_rescale_q(c->coded_frame->pts, c->time_base, st->time_base);
396 if(c->coded_frame->key_frame)
397 pkt.flags |= AV_PKT_FLAG_KEY;
398 pkt.stream_index= st->index;
399 pkt.data= video_outbuf;
400 pkt.size= out_size;
401
402 /* write the compressed frame in the media file */
403 ret = av_interleaved_write_frame(oc, &pkt);
404 } else {
405 ret = 0;
406 }
407 }
408 if (ret != 0) {
409 fprintf(stderr, "Error while writing video frame\n");
410 exit(1);
411 }
412 frame_count++;
413 }
414
415 static void close_video(AVFormatContext *oc, AVStream *st)
416 {
417 avcodec_close(st->codec);
418 av_free(picture->data[0]);
419 av_free(picture);
420 if (tmp_picture) {
421 av_free(tmp_picture->data[0]);
422 av_free(tmp_picture);
423 }
424 av_free(video_outbuf);
425 }
426
427 /**************************************************************/
428 /* media file output */
429
430 int main(int argc, char **argv)
431 {
432 const char *filename;
433 AVOutputFormat *fmt;
434 AVFormatContext *oc;
435 AVStream *audio_st, *video_st;
436 double audio_pts, video_pts;
437 int i;
438
439 /* initialize libavcodec, and register all codecs and formats */
440 av_register_all();
441
442 if (argc != 2) {
443 printf("usage: %s output_file\n"
444 "API example program to output a media file with libavformat.\n"
445 "The output format is automatically guessed according to the file extension.\n"
446 "Raw images can also be output by using '%%d' in the filename\n"
447 "\n", argv[0]);
448 return 1;
449 }
450
451 filename = argv[1];
452
453 /* auto detect the output format from the name. default is
454 mpeg. */
455 fmt = av_guess_format(NULL, filename, NULL);
456 if (!fmt) {
457 printf("Could not deduce output format from file extension: using MPEG.\n");
458 fmt = av_guess_format("mpeg", NULL, NULL);
459 }
460 if (!fmt) {
461 fprintf(stderr, "Could not find suitable output format\n");
462 return 1;
463 }
464
465 /* allocate the output media context */
466 oc = avformat_alloc_context();
467 if (!oc) {
468 fprintf(stderr, "Memory error\n");
469 return 1;
470 }
471 oc->oformat = fmt;
472 snprintf(oc->filename, sizeof(oc->filename), "%s", filename);
473
474 /* add the audio and video streams using the default format codecs
475 and initialize the codecs */
476 video_st = NULL;
477 audio_st = NULL;
478 if (fmt->video_codec != CODEC_ID_NONE) {
479 video_st = add_video_stream(oc, fmt->video_codec);
480 }
481 if (fmt->audio_codec != CODEC_ID_NONE) {
482 audio_st = add_audio_stream(oc, fmt->audio_codec);
483 }
484
485 /* set the output parameters (must be done even if no
486 parameters). */
487 if (av_set_parameters(oc, NULL) < 0) {
488 fprintf(stderr, "Invalid output format parameters\n");
489 return 1;
490 }
491
492 av_dump_format(oc, 0, filename, 1);
493
494 /* now that all the parameters are set, we can open the audio and
495 video codecs and allocate the necessary encode buffers */
496 if (video_st)
497 open_video(oc, video_st);
498 if (audio_st)
499 open_audio(oc, audio_st);
500
501 /* open the output file, if needed */
502 if (!(fmt->flags & AVFMT_NOFILE)) {
503 if (avio_open(&oc->pb, filename, AVIO_FLAG_WRITE) < 0) {
504 fprintf(stderr, "Could not open '%s'\n", filename);
505 return 1;
506 }
507 }
508
509 /* write the stream header, if any */
510 av_write_header(oc);
511
512 for(;;) {
513 /* compute current audio and video time */
514 if (audio_st)
515 audio_pts = (double)audio_st->pts.val * audio_st->time_base.num / audio_st->time_base.den;
516 else
517 audio_pts = 0.0;
518
519 if (video_st)
520 video_pts = (double)video_st->pts.val * video_st->time_base.num / video_st->time_base.den;
521 else
522 video_pts = 0.0;
523
524 if ((!audio_st || audio_pts >= STREAM_DURATION) &&
525 (!video_st || video_pts >= STREAM_DURATION))
526 break;
527
528 /* write interleaved audio and video frames */
529 if (!video_st || (video_st && audio_st && audio_pts < video_pts)) {
530 write_audio_frame(oc, audio_st);
531 } else {
532 write_video_frame(oc, video_st);
533 }
534 }
535
536 /* write the trailer, if any. the trailer must be written
537 * before you close the CodecContexts open when you wrote the
538 * header; otherwise write_trailer may try to use memory that
539 * was freed on av_codec_close() */
540 av_write_trailer(oc);
541
542 /* close each codec */
543 if (video_st)
544 close_video(oc, video_st);
545 if (audio_st)
546 close_audio(oc, audio_st);
547
548 /* free the streams */
549 for(i = 0; i < oc->nb_streams; i++) {
550 av_freep(&oc->streams[i]->codec);
551 av_freep(&oc->streams[i]);
552 }
553
554 if (!(fmt->flags & AVFMT_NOFILE)) {
555 /* close the output file */
556 avio_close(oc->pb);
557 }
558
559 /* free the stream */
560 av_free(oc);
561
562 return 0;
563 }