Fix previously broken x86_64 check, simplifying it in the process.
[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 3.14159265358979323846
32 #endif
33
34 #include "avformat.h"
35 #include "swscale.h"
36
37 #undef exit
38
39 /* 5 seconds stream duration */
40 #define STREAM_DURATION 5.0
41 #define STREAM_FRAME_RATE 25 /* 25 images/s */
42 #define STREAM_NB_FRAMES ((int)(STREAM_DURATION * STREAM_FRAME_RATE))
43 #define STREAM_PIX_FMT PIX_FMT_YUV420P /* default pix_fmt */
44
45 static int sws_flags = SWS_BICUBIC;
46
47 /**************************************************************/
48 /* audio output */
49
50 float t, tincr, tincr2;
51 int16_t *samples;
52 uint8_t *audio_outbuf;
53 int audio_outbuf_size;
54 int audio_input_frame_size;
55
56 /*
57 * add an audio output stream
58 */
59 static AVStream *add_audio_stream(AVFormatContext *oc, int codec_id)
60 {
61 AVCodecContext *c;
62 AVStream *st;
63
64 st = av_new_stream(oc, 1);
65 if (!st) {
66 fprintf(stderr, "Could not alloc stream\n");
67 exit(1);
68 }
69
70 c = st->codec;
71 c->codec_id = codec_id;
72 c->codec_type = CODEC_TYPE_AUDIO;
73
74 /* put sample parameters */
75 c->bit_rate = 64000;
76 c->sample_rate = 44100;
77 c->channels = 2;
78 return st;
79 }
80
81 static void open_audio(AVFormatContext *oc, AVStream *st)
82 {
83 AVCodecContext *c;
84 AVCodec *codec;
85
86 c = st->codec;
87
88 /* find the audio encoder */
89 codec = avcodec_find_encoder(c->codec_id);
90 if (!codec) {
91 fprintf(stderr, "codec not found\n");
92 exit(1);
93 }
94
95 /* open it */
96 if (avcodec_open(c, codec) < 0) {
97 fprintf(stderr, "could not open codec\n");
98 exit(1);
99 }
100
101 /* init signal generator */
102 t = 0;
103 tincr = 2 * M_PI * 110.0 / c->sample_rate;
104 /* increment frequency by 110 Hz per second */
105 tincr2 = 2 * M_PI * 110.0 / c->sample_rate / c->sample_rate;
106
107 audio_outbuf_size = 10000;
108 audio_outbuf = av_malloc(audio_outbuf_size);
109
110 /* ugly hack for PCM codecs (will be removed ASAP with new PCM
111 support to compute the input frame size in samples */
112 if (c->frame_size <= 1) {
113 audio_input_frame_size = audio_outbuf_size / c->channels;
114 switch(st->codec->codec_id) {
115 case CODEC_ID_PCM_S16LE:
116 case CODEC_ID_PCM_S16BE:
117 case CODEC_ID_PCM_U16LE:
118 case CODEC_ID_PCM_U16BE:
119 audio_input_frame_size >>= 1;
120 break;
121 default:
122 break;
123 }
124 } else {
125 audio_input_frame_size = c->frame_size;
126 }
127 samples = av_malloc(audio_input_frame_size * 2 * c->channels);
128 }
129
130 /* prepare a 16 bit dummy audio frame of 'frame_size' samples and
131 'nb_channels' channels */
132 static void get_audio_frame(int16_t *samples, int frame_size, int nb_channels)
133 {
134 int j, i, v;
135 int16_t *q;
136
137 q = samples;
138 for(j=0;j<frame_size;j++) {
139 v = (int)(sin(t) * 10000);
140 for(i = 0; i < nb_channels; i++)
141 *q++ = v;
142 t += tincr;
143 tincr += tincr2;
144 }
145 }
146
147 static void write_audio_frame(AVFormatContext *oc, AVStream *st)
148 {
149 AVCodecContext *c;
150 AVPacket pkt;
151 av_init_packet(&pkt);
152
153 c = st->codec;
154
155 get_audio_frame(samples, audio_input_frame_size, c->channels);
156
157 pkt.size= avcodec_encode_audio(c, audio_outbuf, audio_outbuf_size, samples);
158
159 pkt.pts= av_rescale_q(c->coded_frame->pts, c->time_base, st->time_base);
160 pkt.flags |= PKT_FLAG_KEY;
161 pkt.stream_index= st->index;
162 pkt.data= audio_outbuf;
163
164 /* write the compressed frame in the media file */
165 if (av_write_frame(oc, &pkt) != 0) {
166 fprintf(stderr, "Error while writing audio frame\n");
167 exit(1);
168 }
169 }
170
171 static void close_audio(AVFormatContext *oc, AVStream *st)
172 {
173 avcodec_close(st->codec);
174
175 av_free(samples);
176 av_free(audio_outbuf);
177 }
178
179 /**************************************************************/
180 /* video output */
181
182 AVFrame *picture, *tmp_picture;
183 uint8_t *video_outbuf;
184 int frame_count, video_outbuf_size;
185
186 /* add a video output stream */
187 static AVStream *add_video_stream(AVFormatContext *oc, int codec_id)
188 {
189 AVCodecContext *c;
190 AVStream *st;
191
192 st = av_new_stream(oc, 0);
193 if (!st) {
194 fprintf(stderr, "Could not alloc stream\n");
195 exit(1);
196 }
197
198 c = st->codec;
199 c->codec_id = codec_id;
200 c->codec_type = CODEC_TYPE_VIDEO;
201
202 /* put sample parameters */
203 c->bit_rate = 400000;
204 /* resolution must be a multiple of two */
205 c->width = 352;
206 c->height = 288;
207 /* time base: this is the fundamental unit of time (in seconds) in terms
208 of which frame timestamps are represented. for fixed-fps content,
209 timebase should be 1/framerate and timestamp increments should be
210 identically 1. */
211 c->time_base.den = STREAM_FRAME_RATE;
212 c->time_base.num = 1;
213 c->gop_size = 12; /* emit one intra frame every twelve frames at most */
214 c->pix_fmt = STREAM_PIX_FMT;
215 if (c->codec_id == CODEC_ID_MPEG2VIDEO) {
216 /* just for testing, we also add B frames */
217 c->max_b_frames = 2;
218 }
219 if (c->codec_id == CODEC_ID_MPEG1VIDEO){
220 /* Needed to avoid using macroblocks in which some coeffs overflow.
221 This does not happen with normal video, it just happens here as
222 the motion of the chroma plane does not match the luma plane. */
223 c->mb_decision=2;
224 }
225 // some formats want stream headers to be separate
226 if(!strcmp(oc->oformat->name, "mp4") || !strcmp(oc->oformat->name, "mov") || !strcmp(oc->oformat->name, "3gp"))
227 c->flags |= CODEC_FLAG_GLOBAL_HEADER;
228
229 return st;
230 }
231
232 static AVFrame *alloc_picture(int pix_fmt, int width, int height)
233 {
234 AVFrame *picture;
235 uint8_t *picture_buf;
236 int size;
237
238 picture = avcodec_alloc_frame();
239 if (!picture)
240 return NULL;
241 size = avpicture_get_size(pix_fmt, width, height);
242 picture_buf = av_malloc(size);
243 if (!picture_buf) {
244 av_free(picture);
245 return NULL;
246 }
247 avpicture_fill((AVPicture *)picture, picture_buf,
248 pix_fmt, width, height);
249 return picture;
250 }
251
252 static void open_video(AVFormatContext *oc, AVStream *st)
253 {
254 AVCodec *codec;
255 AVCodecContext *c;
256
257 c = st->codec;
258
259 /* find the video encoder */
260 codec = avcodec_find_encoder(c->codec_id);
261 if (!codec) {
262 fprintf(stderr, "codec not found\n");
263 exit(1);
264 }
265
266 /* open the codec */
267 if (avcodec_open(c, codec) < 0) {
268 fprintf(stderr, "could not open codec\n");
269 exit(1);
270 }
271
272 video_outbuf = NULL;
273 if (!(oc->oformat->flags & AVFMT_RAWPICTURE)) {
274 /* allocate output buffer */
275 /* XXX: API change will be done */
276 /* buffers passed into lav* can be allocated any way you prefer,
277 as long as they're aligned enough for the architecture, and
278 they're freed appropriately (such as using av_free for buffers
279 allocated with av_malloc) */
280 video_outbuf_size = 200000;
281 video_outbuf = av_malloc(video_outbuf_size);
282 }
283
284 /* allocate the encoded raw picture */
285 picture = alloc_picture(c->pix_fmt, c->width, c->height);
286 if (!picture) {
287 fprintf(stderr, "Could not allocate picture\n");
288 exit(1);
289 }
290
291 /* if the output format is not YUV420P, then a temporary YUV420P
292 picture is needed too. It is then converted to the required
293 output format */
294 tmp_picture = NULL;
295 if (c->pix_fmt != PIX_FMT_YUV420P) {
296 tmp_picture = alloc_picture(PIX_FMT_YUV420P, c->width, c->height);
297 if (!tmp_picture) {
298 fprintf(stderr, "Could not allocate temporary picture\n");
299 exit(1);
300 }
301 }
302 }
303
304 /* prepare a dummy image */
305 static void fill_yuv_image(AVFrame *pict, int frame_index, int width, int height)
306 {
307 int x, y, i;
308
309 i = frame_index;
310
311 /* Y */
312 for(y=0;y<height;y++) {
313 for(x=0;x<width;x++) {
314 pict->data[0][y * pict->linesize[0] + x] = x + y + i * 3;
315 }
316 }
317
318 /* Cb and Cr */
319 for(y=0;y<height/2;y++) {
320 for(x=0;x<width/2;x++) {
321 pict->data[1][y * pict->linesize[1] + x] = 128 + y + i * 2;
322 pict->data[2][y * pict->linesize[2] + x] = 64 + x + i * 5;
323 }
324 }
325 }
326
327 static void write_video_frame(AVFormatContext *oc, AVStream *st)
328 {
329 int out_size, ret;
330 AVCodecContext *c;
331 static struct SwsContext *img_convert_ctx;
332
333 c = st->codec;
334
335 if (frame_count >= STREAM_NB_FRAMES) {
336 /* no more frame to compress. The codec has a latency of a few
337 frames if using B frames, so we get the last frames by
338 passing the same picture again */
339 } else {
340 if (c->pix_fmt != PIX_FMT_YUV420P) {
341 /* as we only generate a YUV420P picture, we must convert it
342 to the codec pixel format if needed */
343 if (img_convert_ctx == NULL) {
344 img_convert_ctx = sws_getContext(c->width, c->height,
345 PIX_FMT_YUV420P,
346 c->width, c->height,
347 c->pix_fmt,
348 sws_flags, NULL, NULL, NULL);
349 if (img_convert_ctx == NULL) {
350 fprintf(stderr, "Cannot initialize the conversion context\n");
351 exit(1);
352 }
353 }
354 fill_yuv_image(tmp_picture, frame_count, c->width, c->height);
355 sws_scale(img_convert_ctx, tmp_picture->data, tmp_picture->linesize,
356 0, c->height, picture->data, picture->linesize);
357 } else {
358 fill_yuv_image(picture, frame_count, c->width, c->height);
359 }
360 }
361
362
363 if (oc->oformat->flags & AVFMT_RAWPICTURE) {
364 /* raw video case. The API will change slightly in the near
365 futur for that */
366 AVPacket pkt;
367 av_init_packet(&pkt);
368
369 pkt.flags |= PKT_FLAG_KEY;
370 pkt.stream_index= st->index;
371 pkt.data= (uint8_t *)picture;
372 pkt.size= sizeof(AVPicture);
373
374 ret = av_write_frame(oc, &pkt);
375 } else {
376 /* encode the image */
377 out_size = avcodec_encode_video(c, video_outbuf, video_outbuf_size, picture);
378 /* if zero size, it means the image was buffered */
379 if (out_size > 0) {
380 AVPacket pkt;
381 av_init_packet(&pkt);
382
383 pkt.pts= av_rescale_q(c->coded_frame->pts, c->time_base, st->time_base);
384 if(c->coded_frame->key_frame)
385 pkt.flags |= PKT_FLAG_KEY;
386 pkt.stream_index= st->index;
387 pkt.data= video_outbuf;
388 pkt.size= out_size;
389
390 /* write the compressed frame in the media file */
391 ret = av_write_frame(oc, &pkt);
392 } else {
393 ret = 0;
394 }
395 }
396 if (ret != 0) {
397 fprintf(stderr, "Error while writing video frame\n");
398 exit(1);
399 }
400 frame_count++;
401 }
402
403 static void close_video(AVFormatContext *oc, AVStream *st)
404 {
405 avcodec_close(st->codec);
406 av_free(picture->data[0]);
407 av_free(picture);
408 if (tmp_picture) {
409 av_free(tmp_picture->data[0]);
410 av_free(tmp_picture);
411 }
412 av_free(video_outbuf);
413 }
414
415 /**************************************************************/
416 /* media file output */
417
418 int main(int argc, char **argv)
419 {
420 const char *filename;
421 AVOutputFormat *fmt;
422 AVFormatContext *oc;
423 AVStream *audio_st, *video_st;
424 double audio_pts, video_pts;
425 int i;
426
427 /* initialize libavcodec, and register all codecs and formats */
428 av_register_all();
429
430 if (argc != 2) {
431 printf("usage: %s output_file\n"
432 "API example program to output a media file with libavformat.\n"
433 "The output format is automatically guessed according to the file extension.\n"
434 "Raw images can also be output by using '%%d' in the filename\n"
435 "\n", argv[0]);
436 exit(1);
437 }
438
439 filename = argv[1];
440
441 /* auto detect the output format from the name. default is
442 mpeg. */
443 fmt = guess_format(NULL, filename, NULL);
444 if (!fmt) {
445 printf("Could not deduce output format from file extension: using MPEG.\n");
446 fmt = guess_format("mpeg", NULL, NULL);
447 }
448 if (!fmt) {
449 fprintf(stderr, "Could not find suitable output format\n");
450 exit(1);
451 }
452
453 /* allocate the output media context */
454 oc = av_alloc_format_context();
455 if (!oc) {
456 fprintf(stderr, "Memory error\n");
457 exit(1);
458 }
459 oc->oformat = fmt;
460 snprintf(oc->filename, sizeof(oc->filename), "%s", filename);
461
462 /* add the audio and video streams using the default format codecs
463 and initialize the codecs */
464 video_st = NULL;
465 audio_st = NULL;
466 if (fmt->video_codec != CODEC_ID_NONE) {
467 video_st = add_video_stream(oc, fmt->video_codec);
468 }
469 if (fmt->audio_codec != CODEC_ID_NONE) {
470 audio_st = add_audio_stream(oc, fmt->audio_codec);
471 }
472
473 /* set the output parameters (must be done even if no
474 parameters). */
475 if (av_set_parameters(oc, NULL) < 0) {
476 fprintf(stderr, "Invalid output format parameters\n");
477 exit(1);
478 }
479
480 dump_format(oc, 0, filename, 1);
481
482 /* now that all the parameters are set, we can open the audio and
483 video codecs and allocate the necessary encode buffers */
484 if (video_st)
485 open_video(oc, video_st);
486 if (audio_st)
487 open_audio(oc, audio_st);
488
489 /* open the output file, if needed */
490 if (!(fmt->flags & AVFMT_NOFILE)) {
491 if (url_fopen(&oc->pb, filename, URL_WRONLY) < 0) {
492 fprintf(stderr, "Could not open '%s'\n", filename);
493 exit(1);
494 }
495 }
496
497 /* write the stream header, if any */
498 av_write_header(oc);
499
500 for(;;) {
501 /* compute current audio and video time */
502 if (audio_st)
503 audio_pts = (double)audio_st->pts.val * audio_st->time_base.num / audio_st->time_base.den;
504 else
505 audio_pts = 0.0;
506
507 if (video_st)
508 video_pts = (double)video_st->pts.val * video_st->time_base.num / video_st->time_base.den;
509 else
510 video_pts = 0.0;
511
512 if ((!audio_st || audio_pts >= STREAM_DURATION) &&
513 (!video_st || video_pts >= STREAM_DURATION))
514 break;
515
516 /* write interleaved audio and video frames */
517 if (!video_st || (video_st && audio_st && audio_pts < video_pts)) {
518 write_audio_frame(oc, audio_st);
519 } else {
520 write_video_frame(oc, video_st);
521 }
522 }
523
524 /* close each codec */
525 if (video_st)
526 close_video(oc, video_st);
527 if (audio_st)
528 close_audio(oc, audio_st);
529
530 /* write the trailer, if any */
531 av_write_trailer(oc);
532
533 /* free the streams */
534 for(i = 0; i < oc->nb_streams; i++) {
535 av_freep(&oc->streams[i]->codec);
536 av_freep(&oc->streams[i]);
537 }
538
539 if (!(fmt->flags & AVFMT_NOFILE)) {
540 /* close the output file */
541 url_fclose(oc->pb);
542 }
543
544 /* free the stream */
545 av_free(oc);
546
547 return 0;
548 }