Audio and analog passthrough: input to output
This sketch demonstrates how to read from and write to the audio and analog input and output buffers.
render() you'll see a nested for loop structure. You'll see this in all Bela projects. The first for loop cycles through
audioFrames, the second through
audioInChannels (in this case left 0 and right 1).
You can access any information about current audio and sensor settings you can do the following:
context->name_of_item. For example
context->audioInChannels returns current number of input channels,
context->audioFrames returns the current number of audio frames,
context->audioSampleRate returns the audio sample rate.
You can look at all the information you can access in BelaContext.
Reading and writing from the audio buffers
The simplest way to read samples from the audio input buffer is with
audioRead() which we pass three arguments: context, current audio frame and current channel. In this example we have
audioRead(context, n, ch) where both
ch are provided by the nested for loop structure.
We can write samples to the audio output buffer in a similar way using
audioWrite(). This has a fourth argument which is the value of the output. For example
audioWrite(context, n, ch, value_to_output).
Reading and writing from the analog buffers
Note that for the analog channels we write to and read from the buffers in a separate set of nested for loops. This is because the they are sampled at half audio rate by default. The first of these for loops cycles through
analogFrames, the second through
audioWriteFrame(context, n, ch, audioReadFrame(context, n, ch)) and
analogWrite(context, n, ch, analogReadFrame(context, n, ch)) we have a simple passthrough of audio input to output and analog input to output.
It is also possible to address the buffers directly, for example:
context->audioOut[n * context->audioOutChannels + ch].
Generated on Sun Jan 19 2020 06:30:17 for Bela by 1.8.11