fix assertion failure when writing mov files
[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_MPEG1VIDEO ||
201 c->codec_id == CODEC_ID_MPEG2VIDEO) {
202 /* just for testing, we also add B frames */
203 c->max_b_frames = 2;
204 }
205 // some formats want stream headers to be seperate
206 if(!strcmp(oc->oformat->name, "mp4") || !strcmp(oc->oformat->name, "mov") || !strcmp(oc->oformat->name, "3gp"))
207 c->flags |= CODEC_FLAG_GLOBAL_HEADER;
208
209 return st;
210 }
211
212 AVFrame *alloc_picture(int pix_fmt, int width, int height)
213 {
214 AVFrame *picture;
215 uint8_t *picture_buf;
216 int size;
217
218 picture = avcodec_alloc_frame();
219 if (!picture)
220 return NULL;
221 size = avpicture_get_size(pix_fmt, width, height);
222 picture_buf = malloc(size);
223 if (!picture_buf) {
224 av_free(picture);
225 return NULL;
226 }
227 avpicture_fill((AVPicture *)picture, picture_buf,
228 pix_fmt, width, height);
229 return picture;
230 }
231
232 void open_video(AVFormatContext *oc, AVStream *st)
233 {
234 AVCodec *codec;
235 AVCodecContext *c;
236
237 c = &st->codec;
238
239 /* find the video encoder */
240 codec = avcodec_find_encoder(c->codec_id);
241 if (!codec) {
242 fprintf(stderr, "codec not found\n");
243 exit(1);
244 }
245
246 /* open the codec */
247 if (avcodec_open(c, codec) < 0) {
248 fprintf(stderr, "could not open codec\n");
249 exit(1);
250 }
251
252 video_outbuf = NULL;
253 if (!(oc->oformat->flags & AVFMT_RAWPICTURE)) {
254 /* allocate output buffer */
255 /* XXX: API change will be done */
256 video_outbuf_size = 200000;
257 video_outbuf = malloc(video_outbuf_size);
258 }
259
260 /* allocate the encoded raw picture */
261 picture = alloc_picture(c->pix_fmt, c->width, c->height);
262 if (!picture) {
263 fprintf(stderr, "Could not allocate picture\n");
264 exit(1);
265 }
266
267 /* if the output format is not YUV420P, then a temporary YUV420P
268 picture is needed too. It is then converted to the required
269 output format */
270 tmp_picture = NULL;
271 if (c->pix_fmt != PIX_FMT_YUV420P) {
272 tmp_picture = alloc_picture(PIX_FMT_YUV420P, c->width, c->height);
273 if (!tmp_picture) {
274 fprintf(stderr, "Could not allocate temporary picture\n");
275 exit(1);
276 }
277 }
278 }
279
280 /* prepare a dummy image */
281 void fill_yuv_image(AVFrame *pict, int frame_index, int width, int height)
282 {
283 int x, y, i;
284
285 i = frame_index;
286
287 /* Y */
288 for(y=0;y<height;y++) {
289 for(x=0;x<width;x++) {
290 pict->data[0][y * pict->linesize[0] + x] = x + y + i * 3;
291 }
292 }
293
294 /* Cb and Cr */
295 for(y=0;y<height/2;y++) {
296 for(x=0;x<width/2;x++) {
297 pict->data[1][y * pict->linesize[1] + x] = 128 + y + i * 2;
298 pict->data[2][y * pict->linesize[2] + x] = 64 + x + i * 5;
299 }
300 }
301 }
302
303 void write_video_frame(AVFormatContext *oc, AVStream *st)
304 {
305 int out_size, ret;
306 AVCodecContext *c;
307 AVFrame *picture_ptr;
308
309 c = &st->codec;
310
311 if (frame_count >= STREAM_NB_FRAMES) {
312 /* no more frame to compress. The codec has a latency of a few
313 frames if using B frames, so we get the last frames by
314 passing a NULL picture */
315 picture_ptr = NULL;
316 } else {
317 if (c->pix_fmt != PIX_FMT_YUV420P) {
318 /* as we only generate a YUV420P picture, we must convert it
319 to the codec pixel format if needed */
320 fill_yuv_image(tmp_picture, frame_count, c->width, c->height);
321 img_convert((AVPicture *)picture, c->pix_fmt,
322 (AVPicture *)tmp_picture, PIX_FMT_YUV420P,
323 c->width, c->height);
324 } else {
325 fill_yuv_image(picture, frame_count, c->width, c->height);
326 }
327 picture_ptr = picture;
328 }
329
330
331 if (oc->oformat->flags & AVFMT_RAWPICTURE) {
332 /* raw video case. The API will change slightly in the near
333 futur for that */
334 ret = av_write_frame(oc, st->index,
335 (uint8_t *)picture_ptr, sizeof(AVPicture));
336 } else {
337 /* encode the image */
338 out_size = avcodec_encode_video(c, video_outbuf, video_outbuf_size, picture_ptr);
339 /* if zero size, it means the image was buffered */
340 if (out_size != 0) {
341 /* write the compressed frame in the media file */
342 /* XXX: in case of B frames, the pts is not yet valid */
343 ret = av_write_frame(oc, st->index, video_outbuf, out_size);
344 } else {
345 ret = 0;
346 }
347 }
348 if (ret != 0) {
349 fprintf(stderr, "Error while writing video frame\n");
350 exit(1);
351 }
352 frame_count++;
353 }
354
355 void close_video(AVFormatContext *oc, AVStream *st)
356 {
357 avcodec_close(&st->codec);
358 av_free(picture->data[0]);
359 av_free(picture);
360 if (tmp_picture) {
361 av_free(tmp_picture->data[0]);
362 av_free(tmp_picture);
363 }
364 av_free(video_outbuf);
365 }
366
367 /**************************************************************/
368 /* media file output */
369
370 int main(int argc, char **argv)
371 {
372 const char *filename;
373 AVOutputFormat *fmt;
374 AVFormatContext *oc;
375 AVStream *audio_st, *video_st;
376 double audio_pts, video_pts;
377 int i;
378
379 /* initialize libavcodec, and register all codecs and formats */
380 av_register_all();
381
382 if (argc != 2) {
383 printf("usage: %s output_file\n"
384 "API example program to output a media file with libavformat.\n"
385 "The output format is automatically guessed according to the file extension.\n"
386 "Raw images can also be output by using '%%d' in the filename\n"
387 "\n", argv[0]);
388 exit(1);
389 }
390
391 filename = argv[1];
392
393 /* auto detect the output format from the name. default is
394 mpeg. */
395 fmt = guess_format(NULL, filename, NULL);
396 if (!fmt) {
397 printf("Could not deduce output format from file extension: using MPEG.\n");
398 fmt = guess_format("mpeg", NULL, NULL);
399 }
400 if (!fmt) {
401 fprintf(stderr, "Could not find suitable output format\n");
402 exit(1);
403 }
404
405 /* allocate the output media context */
406 oc = av_mallocz(sizeof(AVFormatContext));
407 if (!oc) {
408 fprintf(stderr, "Memory error\n");
409 exit(1);
410 }
411 oc->oformat = fmt;
412 snprintf(oc->filename, sizeof(oc->filename), "%s", filename);
413
414 /* add the audio and video streams using the default format codecs
415 and initialize the codecs */
416 video_st = NULL;
417 audio_st = NULL;
418 if (fmt->video_codec != CODEC_ID_NONE) {
419 video_st = add_video_stream(oc, fmt->video_codec);
420 }
421 if (fmt->audio_codec != CODEC_ID_NONE) {
422 audio_st = add_audio_stream(oc, fmt->audio_codec);
423 }
424
425 /* set the output parameters (must be done even if no
426 parameters). */
427 if (av_set_parameters(oc, NULL) < 0) {
428 fprintf(stderr, "Invalid output format parameters\n");
429 exit(1);
430 }
431
432 dump_format(oc, 0, filename, 1);
433
434 /* now that all the parameters are set, we can open the audio and
435 video codecs and allocate the necessary encode buffers */
436 if (video_st)
437 open_video(oc, video_st);
438 if (audio_st)
439 open_audio(oc, audio_st);
440
441 /* open the output file, if needed */
442 if (!(fmt->flags & AVFMT_NOFILE)) {
443 if (url_fopen(&oc->pb, filename, URL_WRONLY) < 0) {
444 fprintf(stderr, "Could not open '%s'\n", filename);
445 exit(1);
446 }
447 }
448
449 /* write the stream header, if any */
450 av_write_header(oc);
451
452 for(;;) {
453 /* compute current audio and video time */
454 if (audio_st)
455 audio_pts = (double)audio_st->pts.val * oc->pts_num / oc->pts_den;
456 else
457 audio_pts = 0.0;
458
459 if (video_st)
460 video_pts = (double)video_st->pts.val * oc->pts_num / oc->pts_den;
461 else
462 video_pts = 0.0;
463
464 if ((!audio_st || audio_pts >= STREAM_DURATION) &&
465 (!video_st || video_pts >= STREAM_DURATION))
466 break;
467
468 /* write interleaved audio and video frames */
469 if (!video_st || (video_st && audio_st && audio_pts < video_pts)) {
470 write_audio_frame(oc, audio_st);
471 } else {
472 write_video_frame(oc, video_st);
473 }
474 }
475
476 /* close each codec */
477 if (video_st)
478 close_video(oc, video_st);
479 if (audio_st)
480 close_audio(oc, audio_st);
481
482 /* write the trailer, if any */
483 av_write_trailer(oc);
484
485 /* free the streams */
486 for(i = 0; i < oc->nb_streams; i++) {
487 av_freep(&oc->streams[i]);
488 }
489
490 if (!(fmt->flags & AVFMT_NOFILE)) {
491 /* close the output file */
492 url_fclose(&oc->pb);
493 }
494
495 /* free the stream */
496 av_free(oc);
497
498 return 0;
499 }