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1 8de65d4f Fabrice Bellard
/*
2
 * Libavformat API example: Output a media file in any supported
3
 * libavformat format. The default codecs are used.
4 115329f1 Diego Biurrun
 *
5 8de65d4f Fabrice Bellard
 * Copyright (c) 2003 Fabrice Bellard
6 115329f1 Diego Biurrun
 *
7 8de65d4f Fabrice Bellard
 * 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 115329f1 Diego Biurrun
 *
14 8de65d4f Fabrice Bellard
 * The above copyright notice and this permission notice shall be included in
15
 * all copies or substantial portions of the Software.
16 115329f1 Diego Biurrun
 *
17 8de65d4f Fabrice Bellard
 * 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 115329f1 Diego Biurrun
 * THE SOFTWARE.
24 8de65d4f Fabrice Bellard
 */
25
#include <stdlib.h>
26
#include <stdio.h>
27 af547ce5 Michael Niedermayer
#include <string.h>
28 8de65d4f Fabrice Bellard
#include <math.h>
29
30 264cb2b8 Michael Niedermayer
#ifndef M_PI
31 a40de112 Panagiotis Issaris
#define M_PI 3.14159265358979323846
32 264cb2b8 Michael Niedermayer
#endif
33
34 8de65d4f Fabrice Bellard
#include "avformat.h"
35 03ae87a3 Luca Abeni
#include "swscale.h"
36 8de65d4f Fabrice Bellard
37 364a9607 Diego Biurrun
#undef exit
38
39 8de65d4f Fabrice Bellard
/* 5 seconds stream duration */
40 cb0c448a Fabrice Bellard
#define STREAM_DURATION   5.0
41
#define STREAM_FRAME_RATE 25 /* 25 images/s */
42
#define STREAM_NB_FRAMES  ((int)(STREAM_DURATION * STREAM_FRAME_RATE))
43 002c01a6 Andreas Öman
#define STREAM_PIX_FMT PIX_FMT_YUV420P /* default pix_fmt */
44 8de65d4f Fabrice Bellard
45 03ae87a3 Luca Abeni
static int sws_flags = SWS_BICUBIC;
46
47 8de65d4f Fabrice Bellard
/**************************************************************/
48
/* audio output */
49
50 e70fcf07 Fabrice Bellard
float t, tincr, tincr2;
51 8de65d4f Fabrice Bellard
int16_t *samples;
52
uint8_t *audio_outbuf;
53
int audio_outbuf_size;
54
int audio_input_frame_size;
55
56 115329f1 Diego Biurrun
/*
57 8de65d4f Fabrice Bellard
 * add an audio output stream
58
 */
59 ceaf1909 Dieter
static AVStream *add_audio_stream(AVFormatContext *oc, int codec_id)
60 8de65d4f Fabrice Bellard
{
61
    AVCodecContext *c;
62
    AVStream *st;
63
64
    st = av_new_stream(oc, 1);
65
    if (!st) {
66
        fprintf(stderr, "Could not alloc stream\n");
67
        exit(1);
68
    }
69
70 01f4895c Michael Niedermayer
    c = st->codec;
71 e70fcf07 Fabrice Bellard
    c->codec_id = codec_id;
72 8de65d4f Fabrice Bellard
    c->codec_type = CODEC_TYPE_AUDIO;
73
74
    /* put sample parameters */
75
    c->bit_rate = 64000;
76
    c->sample_rate = 44100;
77
    c->channels = 2;
78 e70fcf07 Fabrice Bellard
    return st;
79
}
80
81 ceaf1909 Dieter
static void open_audio(AVFormatContext *oc, AVStream *st)
82 e70fcf07 Fabrice Bellard
{
83
    AVCodecContext *c;
84
    AVCodec *codec;
85
86 01f4895c Michael Niedermayer
    c = st->codec;
87 e70fcf07 Fabrice Bellard
88
    /* find the audio encoder */
89
    codec = avcodec_find_encoder(c->codec_id);
90
    if (!codec) {
91
        fprintf(stderr, "codec not found\n");
92
        exit(1);
93
    }
94 8de65d4f Fabrice Bellard
95
    /* open it */
96
    if (avcodec_open(c, codec) < 0) {
97
        fprintf(stderr, "could not open codec\n");
98
        exit(1);
99
    }
100
101
    /* init signal generator */
102
    t = 0;
103 e70fcf07 Fabrice Bellard
    tincr = 2 * M_PI * 110.0 / c->sample_rate;
104
    /* increment frequency by 110 Hz per second */
105
    tincr2 = 2 * M_PI * 110.0 / c->sample_rate / c->sample_rate;
106 8de65d4f Fabrice Bellard
107
    audio_outbuf_size = 10000;
108 5d915e82 Ramiro Polla
    audio_outbuf = av_malloc(audio_outbuf_size);
109 8de65d4f Fabrice Bellard
110
    /* ugly hack for PCM codecs (will be removed ASAP with new PCM
111
       support to compute the input frame size in samples */
112
    if (c->frame_size <= 1) {
113
        audio_input_frame_size = audio_outbuf_size / c->channels;
114 01f4895c Michael Niedermayer
        switch(st->codec->codec_id) {
115 8de65d4f Fabrice Bellard
        case CODEC_ID_PCM_S16LE:
116
        case CODEC_ID_PCM_S16BE:
117
        case CODEC_ID_PCM_U16LE:
118
        case CODEC_ID_PCM_U16BE:
119
            audio_input_frame_size >>= 1;
120
            break;
121
        default:
122
            break;
123
        }
124
    } else {
125
        audio_input_frame_size = c->frame_size;
126
    }
127 5d915e82 Ramiro Polla
    samples = av_malloc(audio_input_frame_size * 2 * c->channels);
128 8de65d4f Fabrice Bellard
}
129
130 cb750e33 Fabrice Bellard
/* prepare a 16 bit dummy audio frame of 'frame_size' samples and
131
   'nb_channels' channels */
132 ceaf1909 Dieter
static void get_audio_frame(int16_t *samples, int frame_size, int nb_channels)
133 cb750e33 Fabrice Bellard
{
134
    int j, i, v;
135
    int16_t *q;
136
137
    q = samples;
138
    for(j=0;j<frame_size;j++) {
139
        v = (int)(sin(t) * 10000);
140
        for(i = 0; i < nb_channels; i++)
141
            *q++ = v;
142
        t += tincr;
143
        tincr += tincr2;
144
    }
145
}
146
147 ceaf1909 Dieter
static void write_audio_frame(AVFormatContext *oc, AVStream *st)
148 8de65d4f Fabrice Bellard
{
149
    AVCodecContext *c;
150 e928649b Michael Niedermayer
    AVPacket pkt;
151
    av_init_packet(&pkt);
152 115329f1 Diego Biurrun
153 01f4895c Michael Niedermayer
    c = st->codec;
154 8de65d4f Fabrice Bellard
155 cb750e33 Fabrice Bellard
    get_audio_frame(samples, audio_input_frame_size, c->channels);
156
157 e928649b Michael Niedermayer
    pkt.size= avcodec_encode_audio(c, audio_outbuf, audio_outbuf_size, samples);
158
159 002c01a6 Andreas Öman
    pkt.pts= av_rescale_q(c->coded_frame->pts, c->time_base, st->time_base);
160 e928649b Michael Niedermayer
    pkt.flags |= PKT_FLAG_KEY;
161
    pkt.stream_index= st->index;
162
    pkt.data= audio_outbuf;
163 8de65d4f Fabrice Bellard
164
    /* write the compressed frame in the media file */
165 e928649b Michael Niedermayer
    if (av_write_frame(oc, &pkt) != 0) {
166 8de65d4f Fabrice Bellard
        fprintf(stderr, "Error while writing audio frame\n");
167
        exit(1);
168
    }
169
}
170
171 ceaf1909 Dieter
static void close_audio(AVFormatContext *oc, AVStream *st)
172 e70fcf07 Fabrice Bellard
{
173 01f4895c Michael Niedermayer
    avcodec_close(st->codec);
174 115329f1 Diego Biurrun
175 e70fcf07 Fabrice Bellard
    av_free(samples);
176
    av_free(audio_outbuf);
177
}
178
179 8de65d4f Fabrice Bellard
/**************************************************************/
180
/* video output */
181
182 e70fcf07 Fabrice Bellard
AVFrame *picture, *tmp_picture;
183 8de65d4f Fabrice Bellard
uint8_t *video_outbuf;
184
int frame_count, video_outbuf_size;
185
186
/* add a video output stream */
187 ceaf1909 Dieter
static AVStream *add_video_stream(AVFormatContext *oc, int codec_id)
188 8de65d4f Fabrice Bellard
{
189
    AVCodecContext *c;
190
    AVStream *st;
191
192
    st = av_new_stream(oc, 0);
193
    if (!st) {
194
        fprintf(stderr, "Could not alloc stream\n");
195
        exit(1);
196
    }
197 115329f1 Diego Biurrun
198 01f4895c Michael Niedermayer
    c = st->codec;
199 e70fcf07 Fabrice Bellard
    c->codec_id = codec_id;
200 8de65d4f Fabrice Bellard
    c->codec_type = CODEC_TYPE_VIDEO;
201
202
    /* put sample parameters */
203
    c->bit_rate = 400000;
204
    /* resolution must be a multiple of two */
205 115329f1 Diego Biurrun
    c->width = 352;
206 8de65d4f Fabrice Bellard
    c->height = 288;
207 5b28c8c3 Michael Niedermayer
    /* time base: this is the fundamental unit of time (in seconds) in terms
208
       of which frame timestamps are represented. for fixed-fps content,
209
       timebase should be 1/framerate and timestamp increments should be
210
       identically 1. */
211 115329f1 Diego Biurrun
    c->time_base.den = STREAM_FRAME_RATE;
212 c0df9d75 Michael Niedermayer
    c->time_base.num = 1;
213 cb0c448a Fabrice Bellard
    c->gop_size = 12; /* emit one intra frame every twelve frames at most */
214 002c01a6 Andreas Öman
    c->pix_fmt = STREAM_PIX_FMT;
215 85e33747 Michael Niedermayer
    if (c->codec_id == CODEC_ID_MPEG2VIDEO) {
216 cb0c448a Fabrice Bellard
        /* just for testing, we also add B frames */
217
        c->max_b_frames = 2;
218
    }
219 85e33747 Michael Niedermayer
    if (c->codec_id == CODEC_ID_MPEG1VIDEO){
220 755bfeab Diego Biurrun
        /* Needed to avoid using macroblocks in which some coeffs overflow.
221
           This does not happen with normal video, it just happens here as
222
           the motion of the chroma plane does not match the luma plane. */
223 85e33747 Michael Niedermayer
        c->mb_decision=2;
224
    }
225 0afd2a92 Diego Biurrun
    // some formats want stream headers to be separate
226 af547ce5 Michael Niedermayer
    if(!strcmp(oc->oformat->name, "mp4") || !strcmp(oc->oformat->name, "mov") || !strcmp(oc->oformat->name, "3gp"))
227
        c->flags |= CODEC_FLAG_GLOBAL_HEADER;
228 115329f1 Diego Biurrun
229 e70fcf07 Fabrice Bellard
    return st;
230
}
231
232 ceaf1909 Dieter
static AVFrame *alloc_picture(int pix_fmt, int width, int height)
233 e70fcf07 Fabrice Bellard
{
234
    AVFrame *picture;
235
    uint8_t *picture_buf;
236
    int size;
237 115329f1 Diego Biurrun
238 e70fcf07 Fabrice Bellard
    picture = avcodec_alloc_frame();
239
    if (!picture)
240
        return NULL;
241
    size = avpicture_get_size(pix_fmt, width, height);
242 5d915e82 Ramiro Polla
    picture_buf = av_malloc(size);
243 e70fcf07 Fabrice Bellard
    if (!picture_buf) {
244
        av_free(picture);
245
        return NULL;
246
    }
247 115329f1 Diego Biurrun
    avpicture_fill((AVPicture *)picture, picture_buf,
248 e70fcf07 Fabrice Bellard
                   pix_fmt, width, height);
249
    return picture;
250
}
251 115329f1 Diego Biurrun
252 ceaf1909 Dieter
static void open_video(AVFormatContext *oc, AVStream *st)
253 e70fcf07 Fabrice Bellard
{
254
    AVCodec *codec;
255
    AVCodecContext *c;
256
257 01f4895c Michael Niedermayer
    c = st->codec;
258 e70fcf07 Fabrice Bellard
259
    /* find the video encoder */
260
    codec = avcodec_find_encoder(c->codec_id);
261
    if (!codec) {
262
        fprintf(stderr, "codec not found\n");
263
        exit(1);
264
    }
265
266
    /* open the codec */
267 8de65d4f Fabrice Bellard
    if (avcodec_open(c, codec) < 0) {
268
        fprintf(stderr, "could not open codec\n");
269
        exit(1);
270
    }
271
272 e70fcf07 Fabrice Bellard
    video_outbuf = NULL;
273
    if (!(oc->oformat->flags & AVFMT_RAWPICTURE)) {
274
        /* allocate output buffer */
275
        /* XXX: API change will be done */
276 5d915e82 Ramiro Polla
        /* buffers passed into lav* can be allocated any way you prefer,
277
           as long as they're aligned enough for the architecture, and
278
           they're freed appropriately (such as using av_free for buffers
279
           allocated with av_malloc) */
280 e70fcf07 Fabrice Bellard
        video_outbuf_size = 200000;
281 5d915e82 Ramiro Polla
        video_outbuf = av_malloc(video_outbuf_size);
282 e70fcf07 Fabrice Bellard
    }
283 8de65d4f Fabrice Bellard
284 e70fcf07 Fabrice Bellard
    /* allocate the encoded raw picture */
285
    picture = alloc_picture(c->pix_fmt, c->width, c->height);
286
    if (!picture) {
287
        fprintf(stderr, "Could not allocate picture\n");
288
        exit(1);
289
    }
290 8de65d4f Fabrice Bellard
291 e70fcf07 Fabrice Bellard
    /* if the output format is not YUV420P, then a temporary YUV420P
292
       picture is needed too. It is then converted to the required
293
       output format */
294
    tmp_picture = NULL;
295
    if (c->pix_fmt != PIX_FMT_YUV420P) {
296
        tmp_picture = alloc_picture(PIX_FMT_YUV420P, c->width, c->height);
297
        if (!tmp_picture) {
298
            fprintf(stderr, "Could not allocate temporary picture\n");
299
            exit(1);
300
        }
301
    }
302
}
303 8de65d4f Fabrice Bellard
304 e70fcf07 Fabrice Bellard
/* prepare a dummy image */
305 ceaf1909 Dieter
static void fill_yuv_image(AVFrame *pict, int frame_index, int width, int height)
306 8de65d4f Fabrice Bellard
{
307 e70fcf07 Fabrice Bellard
    int x, y, i;
308
309
    i = frame_index;
310 8de65d4f Fabrice Bellard
311
    /* Y */
312 e70fcf07 Fabrice Bellard
    for(y=0;y<height;y++) {
313
        for(x=0;x<width;x++) {
314
            pict->data[0][y * pict->linesize[0] + x] = x + y + i * 3;
315 8de65d4f Fabrice Bellard
        }
316
    }
317 115329f1 Diego Biurrun
318 8de65d4f Fabrice Bellard
    /* Cb and Cr */
319 e70fcf07 Fabrice Bellard
    for(y=0;y<height/2;y++) {
320
        for(x=0;x<width/2;x++) {
321
            pict->data[1][y * pict->linesize[1] + x] = 128 + y + i * 2;
322
            pict->data[2][y * pict->linesize[2] + x] = 64 + x + i * 5;
323 8de65d4f Fabrice Bellard
        }
324
    }
325 e70fcf07 Fabrice Bellard
}
326 8de65d4f Fabrice Bellard
327 ceaf1909 Dieter
static void write_video_frame(AVFormatContext *oc, AVStream *st)
328 e70fcf07 Fabrice Bellard
{
329
    int out_size, ret;
330
    AVCodecContext *c;
331 03ae87a3 Luca Abeni
    static struct SwsContext *img_convert_ctx;
332 115329f1 Diego Biurrun
333 01f4895c Michael Niedermayer
    c = st->codec;
334 115329f1 Diego Biurrun
335 cb0c448a Fabrice Bellard
    if (frame_count >= STREAM_NB_FRAMES) {
336
        /* no more frame to compress. The codec has a latency of a few
337
           frames if using B frames, so we get the last frames by
338 002c01a6 Andreas Öman
           passing the same picture again */
339 e70fcf07 Fabrice Bellard
    } else {
340 cb0c448a Fabrice Bellard
        if (c->pix_fmt != PIX_FMT_YUV420P) {
341
            /* as we only generate a YUV420P picture, we must convert it
342
               to the codec pixel format if needed */
343 03ae87a3 Luca Abeni
            if (img_convert_ctx == NULL) {
344
                img_convert_ctx = sws_getContext(c->width, c->height,
345
                                                 PIX_FMT_YUV420P,
346
                                                 c->width, c->height,
347
                                                 c->pix_fmt,
348
                                                 sws_flags, NULL, NULL, NULL);
349
                if (img_convert_ctx == NULL) {
350
                    fprintf(stderr, "Cannot initialize the conversion context\n");
351
                    exit(1);
352
                }
353
            }
354 cb0c448a Fabrice Bellard
            fill_yuv_image(tmp_picture, frame_count, c->width, c->height);
355 03ae87a3 Luca Abeni
            sws_scale(img_convert_ctx, tmp_picture->data, tmp_picture->linesize,
356
                      0, c->height, picture->data, picture->linesize);
357 cb0c448a Fabrice Bellard
        } else {
358
            fill_yuv_image(picture, frame_count, c->width, c->height);
359
        }
360 e70fcf07 Fabrice Bellard
    }
361
362 115329f1 Diego Biurrun
363 e70fcf07 Fabrice Bellard
    if (oc->oformat->flags & AVFMT_RAWPICTURE) {
364
        /* raw video case. The API will change slightly in the near
365
           futur for that */
366 e928649b Michael Niedermayer
        AVPacket pkt;
367
        av_init_packet(&pkt);
368 115329f1 Diego Biurrun
369 e928649b Michael Niedermayer
        pkt.flags |= PKT_FLAG_KEY;
370
        pkt.stream_index= st->index;
371 002c01a6 Andreas Öman
        pkt.data= (uint8_t *)picture;
372 e928649b Michael Niedermayer
        pkt.size= sizeof(AVPicture);
373 115329f1 Diego Biurrun
374 e928649b Michael Niedermayer
        ret = av_write_frame(oc, &pkt);
375 e70fcf07 Fabrice Bellard
    } else {
376
        /* encode the image */
377 002c01a6 Andreas Öman
        out_size = avcodec_encode_video(c, video_outbuf, video_outbuf_size, picture);
378 cb0c448a Fabrice Bellard
        /* if zero size, it means the image was buffered */
379 b5bc8591 Michael Niedermayer
        if (out_size > 0) {
380 e928649b Michael Niedermayer
            AVPacket pkt;
381
            av_init_packet(&pkt);
382 115329f1 Diego Biurrun
383 002c01a6 Andreas Öman
            pkt.pts= av_rescale_q(c->coded_frame->pts, c->time_base, st->time_base);
384 e928649b Michael Niedermayer
            if(c->coded_frame->key_frame)
385
                pkt.flags |= PKT_FLAG_KEY;
386
            pkt.stream_index= st->index;
387
            pkt.data= video_outbuf;
388
            pkt.size= out_size;
389 115329f1 Diego Biurrun
390 cb0c448a Fabrice Bellard
            /* write the compressed frame in the media file */
391 e928649b Michael Niedermayer
            ret = av_write_frame(oc, &pkt);
392 cb0c448a Fabrice Bellard
        } else {
393
            ret = 0;
394
        }
395 e70fcf07 Fabrice Bellard
    }
396
    if (ret != 0) {
397 8de65d4f Fabrice Bellard
        fprintf(stderr, "Error while writing video frame\n");
398
        exit(1);
399
    }
400 e70fcf07 Fabrice Bellard
    frame_count++;
401
}
402
403 ceaf1909 Dieter
static void close_video(AVFormatContext *oc, AVStream *st)
404 e70fcf07 Fabrice Bellard
{
405 01f4895c Michael Niedermayer
    avcodec_close(st->codec);
406 e70fcf07 Fabrice Bellard
    av_free(picture->data[0]);
407
    av_free(picture);
408
    if (tmp_picture) {
409
        av_free(tmp_picture->data[0]);
410
        av_free(tmp_picture);
411
    }
412
    av_free(video_outbuf);
413 8de65d4f Fabrice Bellard
}
414
415
/**************************************************************/
416
/* media file output */
417
418
int main(int argc, char **argv)
419
{
420
    const char *filename;
421
    AVOutputFormat *fmt;
422
    AVFormatContext *oc;
423 e70fcf07 Fabrice Bellard
    AVStream *audio_st, *video_st;
424 8de65d4f Fabrice Bellard
    double audio_pts, video_pts;
425 e70fcf07 Fabrice Bellard
    int i;
426
427 8de65d4f Fabrice Bellard
    /* initialize libavcodec, and register all codecs and formats */
428
    av_register_all();
429 115329f1 Diego Biurrun
430 8de65d4f Fabrice Bellard
    if (argc != 2) {
431
        printf("usage: %s output_file\n"
432 e70fcf07 Fabrice Bellard
               "API example program to output a media file with libavformat.\n"
433
               "The output format is automatically guessed according to the file extension.\n"
434
               "Raw images can also be output by using '%%d' in the filename\n"
435 8de65d4f Fabrice Bellard
               "\n", argv[0]);
436
        exit(1);
437
    }
438 115329f1 Diego Biurrun
439 8de65d4f Fabrice Bellard
    filename = argv[1];
440
441
    /* auto detect the output format from the name. default is
442
       mpeg. */
443
    fmt = guess_format(NULL, filename, NULL);
444
    if (!fmt) {
445
        printf("Could not deduce output format from file extension: using MPEG.\n");
446
        fmt = guess_format("mpeg", NULL, NULL);
447
    }
448
    if (!fmt) {
449
        fprintf(stderr, "Could not find suitable output format\n");
450
        exit(1);
451
    }
452 115329f1 Diego Biurrun
453 8de65d4f Fabrice Bellard
    /* allocate the output media context */
454 bc874dae Michel Bardiaux
    oc = av_alloc_format_context();
455 8de65d4f Fabrice Bellard
    if (!oc) {
456
        fprintf(stderr, "Memory error\n");
457
        exit(1);
458
    }
459
    oc->oformat = fmt;
460 e70fcf07 Fabrice Bellard
    snprintf(oc->filename, sizeof(oc->filename), "%s", filename);
461 8de65d4f Fabrice Bellard
462
    /* add the audio and video streams using the default format codecs
463
       and initialize the codecs */
464
    video_st = NULL;
465
    audio_st = NULL;
466
    if (fmt->video_codec != CODEC_ID_NONE) {
467
        video_st = add_video_stream(oc, fmt->video_codec);
468
    }
469
    if (fmt->audio_codec != CODEC_ID_NONE) {
470
        audio_st = add_audio_stream(oc, fmt->audio_codec);
471
    }
472
473 e70fcf07 Fabrice Bellard
    /* set the output parameters (must be done even if no
474
       parameters). */
475
    if (av_set_parameters(oc, NULL) < 0) {
476
        fprintf(stderr, "Invalid output format parameters\n");
477
        exit(1);
478
    }
479
480 8de65d4f Fabrice Bellard
    dump_format(oc, 0, filename, 1);
481
482 e70fcf07 Fabrice Bellard
    /* now that all the parameters are set, we can open the audio and
483
       video codecs and allocate the necessary encode buffers */
484
    if (video_st)
485
        open_video(oc, video_st);
486
    if (audio_st)
487
        open_audio(oc, audio_st);
488
489 8de65d4f Fabrice Bellard
    /* open the output file, if needed */
490
    if (!(fmt->flags & AVFMT_NOFILE)) {
491
        if (url_fopen(&oc->pb, filename, URL_WRONLY) < 0) {
492
            fprintf(stderr, "Could not open '%s'\n", filename);
493
            exit(1);
494
        }
495
    }
496 115329f1 Diego Biurrun
497 8de65d4f Fabrice Bellard
    /* write the stream header, if any */
498
    av_write_header(oc);
499 115329f1 Diego Biurrun
500 8de65d4f Fabrice Bellard
    for(;;) {
501
        /* compute current audio and video time */
502
        if (audio_st)
503 e06d3d55 Michael Niedermayer
            audio_pts = (double)audio_st->pts.val * audio_st->time_base.num / audio_st->time_base.den;
504 8de65d4f Fabrice Bellard
        else
505
            audio_pts = 0.0;
506 115329f1 Diego Biurrun
507 8de65d4f Fabrice Bellard
        if (video_st)
508 e06d3d55 Michael Niedermayer
            video_pts = (double)video_st->pts.val * video_st->time_base.num / video_st->time_base.den;
509 8de65d4f Fabrice Bellard
        else
510
            video_pts = 0.0;
511
512 115329f1 Diego Biurrun
        if ((!audio_st || audio_pts >= STREAM_DURATION) &&
513 8de65d4f Fabrice Bellard
            (!video_st || video_pts >= STREAM_DURATION))
514
            break;
515 115329f1 Diego Biurrun
516 8de65d4f Fabrice Bellard
        /* write interleaved audio and video frames */
517 e70fcf07 Fabrice Bellard
        if (!video_st || (video_st && audio_st && audio_pts < video_pts)) {
518 8de65d4f Fabrice Bellard
            write_audio_frame(oc, audio_st);
519
        } else {
520
            write_video_frame(oc, video_st);
521
        }
522
    }
523
524
    /* close each codec */
525 e70fcf07 Fabrice Bellard
    if (video_st)
526
        close_video(oc, video_st);
527
    if (audio_st)
528
        close_audio(oc, audio_st);
529 8de65d4f Fabrice Bellard
530
    /* write the trailer, if any */
531
    av_write_trailer(oc);
532 115329f1 Diego Biurrun
533 e70fcf07 Fabrice Bellard
    /* free the streams */
534
    for(i = 0; i < oc->nb_streams; i++) {
535 8720de5b Michael Niedermayer
        av_freep(&oc->streams[i]->codec);
536 e70fcf07 Fabrice Bellard
        av_freep(&oc->streams[i]);
537
    }
538
539 8de65d4f Fabrice Bellard
    if (!(fmt->flags & AVFMT_NOFILE)) {
540
        /* close the output file */
541
        url_fclose(&oc->pb);
542
    }
543
544
    /* free the stream */
545
    av_free(oc);
546
547
    return 0;
548
}