static void playNextAudioFrame(struct nodeInstanceData *context, VuoOutputTrigger(decodedAudio, VuoList_VuoAudioSamples))
{
if(context->lastAudioSamples)
{
// Send Audio
if(VuoListGetCount_VuoAudioSamples(context->lastAudioSamples) > 0)
{
VuoAudioSamples as = VuoListGetValueAtIndex_VuoAudioSamples(context->lastAudioSamples, 1);
decodedAudio(context->lastAudioSamples);
}
VuoRelease(context->lastAudioSamples);
context->lastAudioSamples = NULL;
}
uint64_t cur_time = dispatch_time(DISPATCH_TIME_NOW, 0);
if(!context->movie) return;
context->lastAudioSamples = VuoListCreate_VuoAudioSamples();
double frameTimestampInSecs = 0;
bool gotFrame = VuoMovie_getNextAudioSample(context->movie, context->lastAudioSamples, &frameTimestampInSecs);
if(gotFrame)
{
VuoRetain(context->lastAudioSamples);
context->lastAudioTimestamp = frameTimestampInSecs;
}
else
{
VLog("bad");
if(context->lastAudioSamples)
VuoRelease(context->lastAudioSamples);
context->lastAudioSamples = NULL;
}
uint64_t presentationTime = (cur_time + NSEC_PER_SEC * AUDIO_SEC_PER_SAMPLE - 100000);
dispatch_source_set_timer(context->audio_timer, presentationTime, DISPATCH_TIME_FOREVER, NSEC_PER_SEC / 100000 );
}
"dependencies" : [
"VuoAudio"
],
"node": {
"isInterface" : false,
"exampleCompositions" : [ "PanAudio.vuo" ],
}
});
void nodeEvent
(
VuoInputData(VuoList_VuoAudioSamples) audioSamples,
VuoOutputData(VuoAudioSamples) mixedSamples
)
{
unsigned int channelCount = VuoListGetCount_VuoAudioSamples(audioSamples);
*mixedSamples = VuoAudioSamples_alloc(VuoAudioSamples_bufferSize);
for(unsigned int n = 0; n < (*mixedSamples).sampleCount; n++)
(*mixedSamples).samples[n] = 0.;
for(unsigned int i = 0; i < channelCount; i++)
{
VuoAudioSamples as = VuoListGetValueAtIndex_VuoAudioSamples(audioSamples, i+1);
for(unsigned int n = 0; n < as.sampleCount; n++)
(*mixedSamples).samples[n] += as.samples[n];
}
}
#include <OpenGL/CGLMacro.h>
VuoModuleMetadata({
"title" : "Make Image from Channels",
"keywords" : [ "waveform", "amplitudes" ],
"version" : "1.0.0"
});
void nodeEvent
(
VuoInputData(VuoList_VuoAudioSamples) channels,
VuoOutputData(VuoImage) image
)
{
VuoInteger rows = VuoListGetCount_VuoAudioSamples(channels);
if (!rows)
{
*image = NULL;
return;
}
VuoInteger columns = VuoListGetValueAtIndex_VuoAudioSamples(channels, 1).sampleCount;
unsigned char *pixels = (unsigned char *)calloc(1, rows*columns);
for (VuoInteger row = 0; row < rows; ++row)
{
VuoAudioSamples rowSamples = VuoListGetValueAtIndex_VuoAudioSamples(channels, row+1);
for (VuoInteger column = 0; column < MIN(columns, rowSamples.sampleCount); ++column)
pixels[row*columns + column] = 127.5 + rowSamples.samples[column]*127.5;
}