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Code Issues Releases Activity

added get_audio_frame()

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Originally committed as revision 2116 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Fabrice Bellard
2003-08-08 18:03:31 +00:00
parent 12f996edfa
commit cb750e331b
1 changed files with 20 additions and 8 deletions
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26
output_example.c
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@@ -115,20 +115,32 @@ void open_audio(AVFormatContext *oc, AVStream *st)
samples = malloc(audio_input_frame_size * 2 * c->channels); samples = malloc(audio_input_frame_size * 2 * c->channels);
} }
/* prepare a 16 bit dummy audio frame of 'frame_size' samples and
'nb_channels' channels */
void get_audio_frame(int16_t *samples, int frame_size, int nb_channels)
{
int j, i, v;
int16_t *q;
q = samples;
for(j=0;j<frame_size;j++) {
v = (int)(sin(t) * 10000);
for(i = 0; i < nb_channels; i++)
*q++ = v;
t += tincr;
tincr += tincr2;
}
}
void write_audio_frame(AVFormatContext *oc, AVStream *st) void write_audio_frame(AVFormatContext *oc, AVStream *st)
{ {
int j, out_size; int out_size;
AVCodecContext *c; AVCodecContext *c;
c = &st->codec; c = &st->codec;
for(j=0;j<audio_input_frame_size;j++) { get_audio_frame(samples, audio_input_frame_size, c->channels);
samples[2*j] = (int)(sin(t) * 10000);
samples[2*j+1] = samples[2*j];
t += tincr;
tincr += tincr2;
}
out_size = avcodec_encode_audio(c, audio_outbuf, audio_outbuf_size, samples); out_size = avcodec_encode_audio(c, audio_outbuf, audio_outbuf_size, samples);