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[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.
115329f1 4 *
8de65d4f 5 * Copyright (c) 2003 Fabrice Bellard
115329f1 6 *
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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:
115329f1 13 *
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14 * The above copyright notice and this permission notice shall be included in
15 * all copies or substantial portions of the Software.
115329f1 16 *
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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
115329f1 23 * THE SOFTWARE.
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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))
002c01a6 40#define STREAM_PIX_FMT PIX_FMT_YUV420P /* default pix_fmt */
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41
42/**************************************************************/
43/* audio output */
44
e70fcf07 45float t, tincr, tincr2;
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46int16_t *samples;
47uint8_t *audio_outbuf;
48int audio_outbuf_size;
49int audio_input_frame_size;
50
115329f1 51/*
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52 * add an audio output stream
53 */
ceaf1909 54static AVStream *add_audio_stream(AVFormatContext *oc, int codec_id)
8de65d4f 55{
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56 AVCodecContext *c;
57 AVStream *st;
58
59 st = av_new_stream(oc, 1);
60 if (!st) {
61 fprintf(stderr, "Could not alloc stream\n");
62 exit(1);
63 }
64
01f4895c 65 c = st->codec;
e70fcf07 66 c->codec_id = codec_id;
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67 c->codec_type = CODEC_TYPE_AUDIO;
68
69 /* put sample parameters */
70 c->bit_rate = 64000;
71 c->sample_rate = 44100;
72 c->channels = 2;
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73 return st;
74}
75
ceaf1909 76static void open_audio(AVFormatContext *oc, AVStream *st)
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77{
78 AVCodecContext *c;
79 AVCodec *codec;
80
01f4895c 81 c = st->codec;
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82
83 /* find the audio encoder */
84 codec = avcodec_find_encoder(c->codec_id);
85 if (!codec) {
86 fprintf(stderr, "codec not found\n");
87 exit(1);
88 }
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89
90 /* open it */
91 if (avcodec_open(c, codec) < 0) {
92 fprintf(stderr, "could not open codec\n");
93 exit(1);
94 }
95
96 /* init signal generator */
97 t = 0;
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98 tincr = 2 * M_PI * 110.0 / c->sample_rate;
99 /* increment frequency by 110 Hz per second */
100 tincr2 = 2 * M_PI * 110.0 / c->sample_rate / c->sample_rate;
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101
102 audio_outbuf_size = 10000;
103 audio_outbuf = malloc(audio_outbuf_size);
104
105 /* ugly hack for PCM codecs (will be removed ASAP with new PCM
106 support to compute the input frame size in samples */
107 if (c->frame_size <= 1) {
108 audio_input_frame_size = audio_outbuf_size / c->channels;
01f4895c 109 switch(st->codec->codec_id) {
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110 case CODEC_ID_PCM_S16LE:
111 case CODEC_ID_PCM_S16BE:
112 case CODEC_ID_PCM_U16LE:
113 case CODEC_ID_PCM_U16BE:
114 audio_input_frame_size >>= 1;
115 break;
116 default:
117 break;
118 }
119 } else {
120 audio_input_frame_size = c->frame_size;
121 }
122 samples = malloc(audio_input_frame_size * 2 * c->channels);
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123}
124
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125/* prepare a 16 bit dummy audio frame of 'frame_size' samples and
126 'nb_channels' channels */
ceaf1909 127static void get_audio_frame(int16_t *samples, int frame_size, int nb_channels)
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128{
129 int j, i, v;
130 int16_t *q;
131
132 q = samples;
133 for(j=0;j<frame_size;j++) {
134 v = (int)(sin(t) * 10000);
135 for(i = 0; i < nb_channels; i++)
136 *q++ = v;
137 t += tincr;
138 tincr += tincr2;
139 }
140}
141
ceaf1909 142static void write_audio_frame(AVFormatContext *oc, AVStream *st)
8de65d4f 143{
8de65d4f 144 AVCodecContext *c;
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145 AVPacket pkt;
146 av_init_packet(&pkt);
115329f1 147
01f4895c 148 c = st->codec;
8de65d4f 149
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150 get_audio_frame(samples, audio_input_frame_size, c->channels);
151
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152 pkt.size= avcodec_encode_audio(c, audio_outbuf, audio_outbuf_size, samples);
153
002c01a6 154 pkt.pts= av_rescale_q(c->coded_frame->pts, c->time_base, st->time_base);
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155 pkt.flags |= PKT_FLAG_KEY;
156 pkt.stream_index= st->index;
157 pkt.data= audio_outbuf;
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158
159 /* write the compressed frame in the media file */
e928649b 160 if (av_write_frame(oc, &pkt) != 0) {
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161 fprintf(stderr, "Error while writing audio frame\n");
162 exit(1);
163 }
164}
165
ceaf1909 166static void close_audio(AVFormatContext *oc, AVStream *st)
e70fcf07 167{
01f4895c 168 avcodec_close(st->codec);
115329f1 169
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170 av_free(samples);
171 av_free(audio_outbuf);
172}
173
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174/**************************************************************/
175/* video output */
176
e70fcf07 177AVFrame *picture, *tmp_picture;
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178uint8_t *video_outbuf;
179int frame_count, video_outbuf_size;
180
181/* add a video output stream */
ceaf1909 182static AVStream *add_video_stream(AVFormatContext *oc, int codec_id)
8de65d4f 183{
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184 AVCodecContext *c;
185 AVStream *st;
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186
187 st = av_new_stream(oc, 0);
188 if (!st) {
189 fprintf(stderr, "Could not alloc stream\n");
190 exit(1);
191 }
115329f1 192
01f4895c 193 c = st->codec;
e70fcf07 194 c->codec_id = codec_id;
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195 c->codec_type = CODEC_TYPE_VIDEO;
196
197 /* put sample parameters */
198 c->bit_rate = 400000;
199 /* resolution must be a multiple of two */
115329f1 200 c->width = 352;
8de65d4f 201 c->height = 288;
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202 /* time base: this is the fundamental unit of time (in seconds) in terms
203 of which frame timestamps are represented. for fixed-fps content,
204 timebase should be 1/framerate and timestamp increments should be
205 identically 1. */
115329f1 206 c->time_base.den = STREAM_FRAME_RATE;
c0df9d75 207 c->time_base.num = 1;
cb0c448a 208 c->gop_size = 12; /* emit one intra frame every twelve frames at most */
002c01a6 209 c->pix_fmt = STREAM_PIX_FMT;
85e33747 210 if (c->codec_id == CODEC_ID_MPEG2VIDEO) {
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211 /* just for testing, we also add B frames */
212 c->max_b_frames = 2;
213 }
85e33747 214 if (c->codec_id == CODEC_ID_MPEG1VIDEO){
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215 /* needed to avoid using macroblocks in which some coeffs overflow
216 this doesnt happen with normal video, it just happens here as the
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217 motion of the chroma plane doesnt match the luma plane */
218 c->mb_decision=2;
219 }
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220 // some formats want stream headers to be seperate
221 if(!strcmp(oc->oformat->name, "mp4") || !strcmp(oc->oformat->name, "mov") || !strcmp(oc->oformat->name, "3gp"))
222 c->flags |= CODEC_FLAG_GLOBAL_HEADER;
115329f1 223
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224 return st;
225}
226
ceaf1909 227static AVFrame *alloc_picture(int pix_fmt, int width, int height)
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228{
229 AVFrame *picture;
230 uint8_t *picture_buf;
231 int size;
115329f1 232
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233 picture = avcodec_alloc_frame();
234 if (!picture)
235 return NULL;
236 size = avpicture_get_size(pix_fmt, width, height);
237 picture_buf = malloc(size);
238 if (!picture_buf) {
239 av_free(picture);
240 return NULL;
241 }
115329f1 242 avpicture_fill((AVPicture *)picture, picture_buf,
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243 pix_fmt, width, height);
244 return picture;
245}
115329f1 246
ceaf1909 247static void open_video(AVFormatContext *oc, AVStream *st)
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248{
249 AVCodec *codec;
250 AVCodecContext *c;
251
01f4895c 252 c = st->codec;
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253
254 /* find the video encoder */
255 codec = avcodec_find_encoder(c->codec_id);
256 if (!codec) {
257 fprintf(stderr, "codec not found\n");
258 exit(1);
259 }
260
261 /* open the codec */
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262 if (avcodec_open(c, codec) < 0) {
263 fprintf(stderr, "could not open codec\n");
264 exit(1);
265 }
266
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267 video_outbuf = NULL;
268 if (!(oc->oformat->flags & AVFMT_RAWPICTURE)) {
269 /* allocate output buffer */
270 /* XXX: API change will be done */
271 video_outbuf_size = 200000;
272 video_outbuf = malloc(video_outbuf_size);
273 }
8de65d4f 274
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275 /* allocate the encoded raw picture */
276 picture = alloc_picture(c->pix_fmt, c->width, c->height);
277 if (!picture) {
278 fprintf(stderr, "Could not allocate picture\n");
279 exit(1);
280 }
8de65d4f 281
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282 /* if the output format is not YUV420P, then a temporary YUV420P
283 picture is needed too. It is then converted to the required
284 output format */
285 tmp_picture = NULL;
286 if (c->pix_fmt != PIX_FMT_YUV420P) {
287 tmp_picture = alloc_picture(PIX_FMT_YUV420P, c->width, c->height);
288 if (!tmp_picture) {
289 fprintf(stderr, "Could not allocate temporary picture\n");
290 exit(1);
291 }
292 }
293}
8de65d4f 294
e70fcf07 295/* prepare a dummy image */
ceaf1909 296static void fill_yuv_image(AVFrame *pict, int frame_index, int width, int height)
8de65d4f 297{
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298 int x, y, i;
299
300 i = frame_index;
8de65d4f 301
8de65d4f 302 /* Y */
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303 for(y=0;y<height;y++) {
304 for(x=0;x<width;x++) {
305 pict->data[0][y * pict->linesize[0] + x] = x + y + i * 3;
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306 }
307 }
115329f1 308
8de65d4f 309 /* Cb and Cr */
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310 for(y=0;y<height/2;y++) {
311 for(x=0;x<width/2;x++) {
312 pict->data[1][y * pict->linesize[1] + x] = 128 + y + i * 2;
313 pict->data[2][y * pict->linesize[2] + x] = 64 + x + i * 5;
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314 }
315 }
e70fcf07 316}
8de65d4f 317
ceaf1909 318static void write_video_frame(AVFormatContext *oc, AVStream *st)
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319{
320 int out_size, ret;
321 AVCodecContext *c;
115329f1 322
01f4895c 323 c = st->codec;
115329f1 324
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325 if (frame_count >= STREAM_NB_FRAMES) {
326 /* no more frame to compress. The codec has a latency of a few
327 frames if using B frames, so we get the last frames by
002c01a6 328 passing the same picture again */
e70fcf07 329 } else {
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330 if (c->pix_fmt != PIX_FMT_YUV420P) {
331 /* as we only generate a YUV420P picture, we must convert it
332 to the codec pixel format if needed */
333 fill_yuv_image(tmp_picture, frame_count, c->width, c->height);
115329f1 334 img_convert((AVPicture *)picture, c->pix_fmt,
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335 (AVPicture *)tmp_picture, PIX_FMT_YUV420P,
336 c->width, c->height);
337 } else {
338 fill_yuv_image(picture, frame_count, c->width, c->height);
339 }
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340 }
341
115329f1 342
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343 if (oc->oformat->flags & AVFMT_RAWPICTURE) {
344 /* raw video case. The API will change slightly in the near
345 futur for that */
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346 AVPacket pkt;
347 av_init_packet(&pkt);
115329f1 348
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349 pkt.flags |= PKT_FLAG_KEY;
350 pkt.stream_index= st->index;
002c01a6 351 pkt.data= (uint8_t *)picture;
e928649b 352 pkt.size= sizeof(AVPicture);
115329f1 353
e928649b 354 ret = av_write_frame(oc, &pkt);
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355 } else {
356 /* encode the image */
002c01a6 357 out_size = avcodec_encode_video(c, video_outbuf, video_outbuf_size, picture);
cb0c448a 358 /* if zero size, it means the image was buffered */
b5bc8591 359 if (out_size > 0) {
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360 AVPacket pkt;
361 av_init_packet(&pkt);
115329f1 362
002c01a6 363 pkt.pts= av_rescale_q(c->coded_frame->pts, c->time_base, st->time_base);
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364 if(c->coded_frame->key_frame)
365 pkt.flags |= PKT_FLAG_KEY;
366 pkt.stream_index= st->index;
367 pkt.data= video_outbuf;
368 pkt.size= out_size;
115329f1 369
cb0c448a 370 /* write the compressed frame in the media file */
e928649b 371 ret = av_write_frame(oc, &pkt);
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372 } else {
373 ret = 0;
374 }
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375 }
376 if (ret != 0) {
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377 fprintf(stderr, "Error while writing video frame\n");
378 exit(1);
379 }
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380 frame_count++;
381}
382
ceaf1909 383static void close_video(AVFormatContext *oc, AVStream *st)
e70fcf07 384{
01f4895c 385 avcodec_close(st->codec);
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386 av_free(picture->data[0]);
387 av_free(picture);
388 if (tmp_picture) {
389 av_free(tmp_picture->data[0]);
390 av_free(tmp_picture);
391 }
392 av_free(video_outbuf);
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393}
394
395/**************************************************************/
396/* media file output */
397
398int main(int argc, char **argv)
399{
400 const char *filename;
401 AVOutputFormat *fmt;
402 AVFormatContext *oc;
e70fcf07 403 AVStream *audio_st, *video_st;
8de65d4f 404 double audio_pts, video_pts;
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405 int i;
406
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407 /* initialize libavcodec, and register all codecs and formats */
408 av_register_all();
115329f1 409
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410 if (argc != 2) {
411 printf("usage: %s output_file\n"
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412 "API example program to output a media file with libavformat.\n"
413 "The output format is automatically guessed according to the file extension.\n"
414 "Raw images can also be output by using '%%d' in the filename\n"
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415 "\n", argv[0]);
416 exit(1);
417 }
115329f1 418
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419 filename = argv[1];
420
421 /* auto detect the output format from the name. default is
422 mpeg. */
423 fmt = guess_format(NULL, filename, NULL);
424 if (!fmt) {
425 printf("Could not deduce output format from file extension: using MPEG.\n");
426 fmt = guess_format("mpeg", NULL, NULL);
427 }
428 if (!fmt) {
429 fprintf(stderr, "Could not find suitable output format\n");
430 exit(1);
431 }
115329f1 432
8de65d4f 433 /* allocate the output media context */
bc874dae 434 oc = av_alloc_format_context();
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435 if (!oc) {
436 fprintf(stderr, "Memory error\n");
437 exit(1);
438 }
439 oc->oformat = fmt;
e70fcf07 440 snprintf(oc->filename, sizeof(oc->filename), "%s", filename);
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441
442 /* add the audio and video streams using the default format codecs
443 and initialize the codecs */
444 video_st = NULL;
445 audio_st = NULL;
446 if (fmt->video_codec != CODEC_ID_NONE) {
447 video_st = add_video_stream(oc, fmt->video_codec);
448 }
449 if (fmt->audio_codec != CODEC_ID_NONE) {
450 audio_st = add_audio_stream(oc, fmt->audio_codec);
451 }
452
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453 /* set the output parameters (must be done even if no
454 parameters). */
455 if (av_set_parameters(oc, NULL) < 0) {
456 fprintf(stderr, "Invalid output format parameters\n");
457 exit(1);
458 }
459
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460 dump_format(oc, 0, filename, 1);
461
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462 /* now that all the parameters are set, we can open the audio and
463 video codecs and allocate the necessary encode buffers */
464 if (video_st)
465 open_video(oc, video_st);
466 if (audio_st)
467 open_audio(oc, audio_st);
468
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469 /* open the output file, if needed */
470 if (!(fmt->flags & AVFMT_NOFILE)) {
471 if (url_fopen(&oc->pb, filename, URL_WRONLY) < 0) {
472 fprintf(stderr, "Could not open '%s'\n", filename);
473 exit(1);
474 }
475 }
115329f1 476
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477 /* write the stream header, if any */
478 av_write_header(oc);
115329f1 479
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480 for(;;) {
481 /* compute current audio and video time */
482 if (audio_st)
e06d3d55 483 audio_pts = (double)audio_st->pts.val * audio_st->time_base.num / audio_st->time_base.den;
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484 else
485 audio_pts = 0.0;
115329f1 486
8de65d4f 487 if (video_st)
e06d3d55 488 video_pts = (double)video_st->pts.val * video_st->time_base.num / video_st->time_base.den;
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489 else
490 video_pts = 0.0;
491
115329f1 492 if ((!audio_st || audio_pts >= STREAM_DURATION) &&
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493 (!video_st || video_pts >= STREAM_DURATION))
494 break;
115329f1 495
8de65d4f 496 /* write interleaved audio and video frames */
e70fcf07 497 if (!video_st || (video_st && audio_st && audio_pts < video_pts)) {
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498 write_audio_frame(oc, audio_st);
499 } else {
500 write_video_frame(oc, video_st);
501 }
502 }
503
504 /* close each codec */
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505 if (video_st)
506 close_video(oc, video_st);
507 if (audio_st)
508 close_audio(oc, audio_st);
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509
510 /* write the trailer, if any */
511 av_write_trailer(oc);
115329f1 512
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513 /* free the streams */
514 for(i = 0; i < oc->nb_streams; i++) {
8720de5b 515 av_freep(&oc->streams[i]->codec);
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516 av_freep(&oc->streams[i]);
517 }
518
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519 if (!(fmt->flags & AVFMT_NOFILE)) {
520 /* close the output file */
521 url_fclose(&oc->pb);
522 }
523
524 /* free the stream */
525 av_free(oc);
526
527 return 0;
528}