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