avformat/av_seek_frame_binary with growing file patch by (Kenneth Aafl√ły: kenneth...
[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>
af547ce5 27#include <string.h>
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28#include <math.h>
29
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30#ifndef M_PI
31#define M_PI 3.1415926535897931
32#endif
33
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34#include "avformat.h"
35
36/* 5 seconds stream duration */
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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))
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40
41/**************************************************************/
42/* audio output */
43
e70fcf07 44float t, tincr, tincr2;
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45int16_t *samples;
46uint8_t *audio_outbuf;
47int audio_outbuf_size;
48int audio_input_frame_size;
49
50/*
51 * add an audio output stream
52 */
53AVStream *add_audio_stream(AVFormatContext *oc, int codec_id)
54{
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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
8de65d4f 64 c = &st->codec;
e70fcf07 65 c->codec_id = codec_id;
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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;
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72 return st;
73}
74
75void 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 }
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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;
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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;
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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);
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122}
123
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124/* prepare a 16 bit dummy audio frame of 'frame_size' samples and
125 'nb_channels' channels */
126void 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
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141void write_audio_frame(AVFormatContext *oc, AVStream *st)
142{
8de65d4f 143 AVCodecContext *c;
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144 AVPacket pkt;
145 av_init_packet(&pkt);
146
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147 c = &st->codec;
148
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149 get_audio_frame(samples, audio_input_frame_size, c->channels);
150
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151 pkt.size= avcodec_encode_audio(c, audio_outbuf, audio_outbuf_size, samples);
152
153 pkt.pts= c->coded_frame->pts;
154 pkt.flags |= PKT_FLAG_KEY;
155 pkt.stream_index= st->index;
156 pkt.data= audio_outbuf;
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157
158 /* write the compressed frame in the media file */
e928649b 159 if (av_write_frame(oc, &pkt) != 0) {
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160 fprintf(stderr, "Error while writing audio frame\n");
161 exit(1);
162 }
163}
164
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165void close_audio(AVFormatContext *oc, AVStream *st)
166{
167 avcodec_close(&st->codec);
168
169 av_free(samples);
170 av_free(audio_outbuf);
171}
172
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173/**************************************************************/
174/* video output */
175
e70fcf07 176AVFrame *picture, *tmp_picture;
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177uint8_t *video_outbuf;
178int frame_count, video_outbuf_size;
179
180/* add a video output stream */
181AVStream *add_video_stream(AVFormatContext *oc, int codec_id)
182{
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183 AVCodecContext *c;
184 AVStream *st;
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185
186 st = av_new_stream(oc, 0);
187 if (!st) {
188 fprintf(stderr, "Could not alloc stream\n");
189 exit(1);
190 }
191
8de65d4f 192 c = &st->codec;
e70fcf07 193 c->codec_id = codec_id;
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194 c->codec_type = CODEC_TYPE_VIDEO;
195
196 /* put sample parameters */
197 c->bit_rate = 400000;
198 /* resolution must be a multiple of two */
199 c->width = 352;
200 c->height = 288;
201 /* frames per second */
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202 c->time_base.den = STREAM_FRAME_RATE;
203 c->time_base.num = 1;
cb0c448a 204 c->gop_size = 12; /* emit one intra frame every twelve frames at most */
85e33747 205 if (c->codec_id == CODEC_ID_MPEG2VIDEO) {
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206 /* just for testing, we also add B frames */
207 c->max_b_frames = 2;
208 }
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209 if (c->codec_id == CODEC_ID_MPEG1VIDEO){
210 /* needed to avoid using macroblocks in which some coeffs overflow
211 this doesnt happen with normal video, it just happens here as the
212 motion of the chroma plane doesnt match the luma plane */
213 c->mb_decision=2;
214 }
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215 // some formats want stream headers to be seperate
216 if(!strcmp(oc->oformat->name, "mp4") || !strcmp(oc->oformat->name, "mov") || !strcmp(oc->oformat->name, "3gp"))
217 c->flags |= CODEC_FLAG_GLOBAL_HEADER;
218
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219 return st;
220}
221
222AVFrame *alloc_picture(int pix_fmt, int width, int height)
223{
224 AVFrame *picture;
225 uint8_t *picture_buf;
226 int size;
227
228 picture = avcodec_alloc_frame();
229 if (!picture)
230 return NULL;
231 size = avpicture_get_size(pix_fmt, width, height);
232 picture_buf = malloc(size);
233 if (!picture_buf) {
234 av_free(picture);
235 return NULL;
236 }
237 avpicture_fill((AVPicture *)picture, picture_buf,
238 pix_fmt, width, height);
239 return picture;
240}
241
242void open_video(AVFormatContext *oc, AVStream *st)
243{
244 AVCodec *codec;
245 AVCodecContext *c;
246
247 c = &st->codec;
248
249 /* find the video encoder */
250 codec = avcodec_find_encoder(c->codec_id);
251 if (!codec) {
252 fprintf(stderr, "codec not found\n");
253 exit(1);
254 }
255
256 /* open the codec */
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257 if (avcodec_open(c, codec) < 0) {
258 fprintf(stderr, "could not open codec\n");
259 exit(1);
260 }
261
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262 video_outbuf = NULL;
263 if (!(oc->oformat->flags & AVFMT_RAWPICTURE)) {
264 /* allocate output buffer */
265 /* XXX: API change will be done */
266 video_outbuf_size = 200000;
267 video_outbuf = malloc(video_outbuf_size);
268 }
8de65d4f 269
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270 /* allocate the encoded raw picture */
271 picture = alloc_picture(c->pix_fmt, c->width, c->height);
272 if (!picture) {
273 fprintf(stderr, "Could not allocate picture\n");
274 exit(1);
275 }
8de65d4f 276
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277 /* if the output format is not YUV420P, then a temporary YUV420P
278 picture is needed too. It is then converted to the required
279 output format */
280 tmp_picture = NULL;
281 if (c->pix_fmt != PIX_FMT_YUV420P) {
282 tmp_picture = alloc_picture(PIX_FMT_YUV420P, c->width, c->height);
283 if (!tmp_picture) {
284 fprintf(stderr, "Could not allocate temporary picture\n");
285 exit(1);
286 }
287 }
288}
8de65d4f 289
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290/* prepare a dummy image */
291void fill_yuv_image(AVFrame *pict, int frame_index, int width, int height)
8de65d4f 292{
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293 int x, y, i;
294
295 i = frame_index;
8de65d4f 296
8de65d4f 297 /* Y */
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298 for(y=0;y<height;y++) {
299 for(x=0;x<width;x++) {
300 pict->data[0][y * pict->linesize[0] + x] = x + y + i * 3;
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301 }
302 }
303
304 /* Cb and Cr */
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305 for(y=0;y<height/2;y++) {
306 for(x=0;x<width/2;x++) {
307 pict->data[1][y * pict->linesize[1] + x] = 128 + y + i * 2;
308 pict->data[2][y * pict->linesize[2] + x] = 64 + x + i * 5;
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309 }
310 }
e70fcf07 311}
8de65d4f 312
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313void write_video_frame(AVFormatContext *oc, AVStream *st)
314{
315 int out_size, ret;
316 AVCodecContext *c;
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317 AVFrame *picture_ptr;
318
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319 c = &st->codec;
320
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321 if (frame_count >= STREAM_NB_FRAMES) {
322 /* no more frame to compress. The codec has a latency of a few
323 frames if using B frames, so we get the last frames by
324 passing a NULL picture */
325 picture_ptr = NULL;
e70fcf07 326 } else {
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327 if (c->pix_fmt != PIX_FMT_YUV420P) {
328 /* as we only generate a YUV420P picture, we must convert it
329 to the codec pixel format if needed */
330 fill_yuv_image(tmp_picture, frame_count, c->width, c->height);
331 img_convert((AVPicture *)picture, c->pix_fmt,
332 (AVPicture *)tmp_picture, PIX_FMT_YUV420P,
333 c->width, c->height);
334 } else {
335 fill_yuv_image(picture, frame_count, c->width, c->height);
336 }
337 picture_ptr = picture;
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338 }
339
340
341 if (oc->oformat->flags & AVFMT_RAWPICTURE) {
342 /* raw video case. The API will change slightly in the near
343 futur for that */
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344 AVPacket pkt;
345 av_init_packet(&pkt);
346
347 pkt.flags |= PKT_FLAG_KEY;
348 pkt.stream_index= st->index;
349 pkt.data= (uint8_t *)picture_ptr;
350 pkt.size= sizeof(AVPicture);
351
352 ret = av_write_frame(oc, &pkt);
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353 } else {
354 /* encode the image */
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355 out_size = avcodec_encode_video(c, video_outbuf, video_outbuf_size, picture_ptr);
356 /* if zero size, it means the image was buffered */
357 if (out_size != 0) {
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358 AVPacket pkt;
359 av_init_packet(&pkt);
360
361 pkt.pts= c->coded_frame->pts;
362 if(c->coded_frame->key_frame)
363 pkt.flags |= PKT_FLAG_KEY;
364 pkt.stream_index= st->index;
365 pkt.data= video_outbuf;
366 pkt.size= out_size;
367
cb0c448a 368 /* write the compressed frame in the media file */
e928649b 369 ret = av_write_frame(oc, &pkt);
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370 } else {
371 ret = 0;
372 }
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373 }
374 if (ret != 0) {
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375 fprintf(stderr, "Error while writing video frame\n");
376 exit(1);
377 }
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378 frame_count++;
379}
380
381void close_video(AVFormatContext *oc, AVStream *st)
382{
383 avcodec_close(&st->codec);
384 av_free(picture->data[0]);
385 av_free(picture);
386 if (tmp_picture) {
387 av_free(tmp_picture->data[0]);
388 av_free(tmp_picture);
389 }
390 av_free(video_outbuf);
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391}
392
393/**************************************************************/
394/* media file output */
395
396int main(int argc, char **argv)
397{
398 const char *filename;
399 AVOutputFormat *fmt;
400 AVFormatContext *oc;
e70fcf07 401 AVStream *audio_st, *video_st;
8de65d4f 402 double audio_pts, video_pts;
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403 int i;
404
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405 /* initialize libavcodec, and register all codecs and formats */
406 av_register_all();
407
408 if (argc != 2) {
409 printf("usage: %s output_file\n"
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410 "API example program to output a media file with libavformat.\n"
411 "The output format is automatically guessed according to the file extension.\n"
412 "Raw images can also be output by using '%%d' in the filename\n"
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413 "\n", argv[0]);
414 exit(1);
415 }
416
417 filename = argv[1];
418
419 /* auto detect the output format from the name. default is
420 mpeg. */
421 fmt = guess_format(NULL, filename, NULL);
422 if (!fmt) {
423 printf("Could not deduce output format from file extension: using MPEG.\n");
424 fmt = guess_format("mpeg", NULL, NULL);
425 }
426 if (!fmt) {
427 fprintf(stderr, "Could not find suitable output format\n");
428 exit(1);
429 }
430
431 /* allocate the output media context */
bc874dae 432 oc = av_alloc_format_context();
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433 if (!oc) {
434 fprintf(stderr, "Memory error\n");
435 exit(1);
436 }
437 oc->oformat = fmt;
e70fcf07 438 snprintf(oc->filename, sizeof(oc->filename), "%s", filename);
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439
440 /* add the audio and video streams using the default format codecs
441 and initialize the codecs */
442 video_st = NULL;
443 audio_st = NULL;
444 if (fmt->video_codec != CODEC_ID_NONE) {
445 video_st = add_video_stream(oc, fmt->video_codec);
446 }
447 if (fmt->audio_codec != CODEC_ID_NONE) {
448 audio_st = add_audio_stream(oc, fmt->audio_codec);
449 }
450
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451 /* set the output parameters (must be done even if no
452 parameters). */
453 if (av_set_parameters(oc, NULL) < 0) {
454 fprintf(stderr, "Invalid output format parameters\n");
455 exit(1);
456 }
457
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458 dump_format(oc, 0, filename, 1);
459
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460 /* now that all the parameters are set, we can open the audio and
461 video codecs and allocate the necessary encode buffers */
462 if (video_st)
463 open_video(oc, video_st);
464 if (audio_st)
465 open_audio(oc, audio_st);
466
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467 /* open the output file, if needed */
468 if (!(fmt->flags & AVFMT_NOFILE)) {
469 if (url_fopen(&oc->pb, filename, URL_WRONLY) < 0) {
470 fprintf(stderr, "Could not open '%s'\n", filename);
471 exit(1);
472 }
473 }
474
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475 /* write the stream header, if any */
476 av_write_header(oc);
477
478 for(;;) {
479 /* compute current audio and video time */
480 if (audio_st)
e06d3d55 481 audio_pts = (double)audio_st->pts.val * audio_st->time_base.num / audio_st->time_base.den;
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482 else
483 audio_pts = 0.0;
484
485 if (video_st)
e06d3d55 486 video_pts = (double)video_st->pts.val * video_st->time_base.num / video_st->time_base.den;
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487 else
488 video_pts = 0.0;
489
490 if ((!audio_st || audio_pts >= STREAM_DURATION) &&
491 (!video_st || video_pts >= STREAM_DURATION))
492 break;
493
494 /* write interleaved audio and video frames */
e70fcf07 495 if (!video_st || (video_st && audio_st && audio_pts < video_pts)) {
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496 write_audio_frame(oc, audio_st);
497 } else {
498 write_video_frame(oc, video_st);
499 }
500 }
501
502 /* close each codec */
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503 if (video_st)
504 close_video(oc, video_st);
505 if (audio_st)
506 close_audio(oc, audio_st);
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507
508 /* write the trailer, if any */
509 av_write_trailer(oc);
510
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511 /* free the streams */
512 for(i = 0; i < oc->nb_streams; i++) {
513 av_freep(&oc->streams[i]);
514 }
515
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516 if (!(fmt->flags & AVFMT_NOFILE)) {
517 /* close the output file */
518 url_fclose(&oc->pb);
519 }
520
521 /* free the stream */
522 av_free(oc);
523
524 return 0;
525}