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