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trigger for the audio scope vissualization

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Originally committed as revision 7761 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2007-01-29 22:06:55 +00:00
parent a58b82f874
commit ac50bcc834
1 changed files with 17 additions and 1 deletions
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18
ffplay.c
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@ -782,7 +782,23 @@ static void video_audio_display(VideoState *s)
delay -= s->width / 2;
if (delay < s->width)
delay = s->width;
i_start = compute_mod(s->sample_array_index - delay * channels, SAMPLE_ARRAY_SIZE);
i_start= x = compute_mod(s->sample_array_index - delay * channels, SAMPLE_ARRAY_SIZE);
h= INT_MIN;
for(i=0; i<1000; i+=channels){
int idx= (SAMPLE_ARRAY_SIZE + x - i) % SAMPLE_ARRAY_SIZE;
int a= s->sample_array[idx];
int b= s->sample_array[(idx + 4*channels)%SAMPLE_ARRAY_SIZE];
int c= s->sample_array[(idx + 5*channels)%SAMPLE_ARRAY_SIZE];
int d= s->sample_array[(idx + 9*channels)%SAMPLE_ARRAY_SIZE];
int score= a-d;
if(h<score && (b^c)<0){
h= score;
i_start= idx;
}
}
s->last_i_start = i_start;
} else {
i_start = s->last_i_start;