Hi all,
I am trying to make a custom block that implements a MELP vocoder. The block
takes in audio samples(floats) at 8kHz and outputs bits at 2.4kbps. Given that,
I think I will need to use a general block to get the correct input/output
buffer sizes.
The vocoder blocks the audio input to 22.5ms (180 samples) and outputs 54 bits.
I know that I will need to modify the forecast() function, but I am not sure
how. My guess would be something like this:
void
gr::block::forecast(int noutput_items,
gr_vector_int &ninput_items_required)
{
unsigned ninputs = ninput_items_required.size ();
for(unsigned i = 0; i < ninputs; i++)
ninput_items_required[i] = (10/3)*noutput_items;
}
Then call,
consume_each ((10/3)*noutput_items);
Is this the correct approach or am I missing something here? Once I get this
working I will likely try to pack the bits into some integer data type for
efficiency's sake - so I'll need to be to do this for different input/output
ratios other than 10/3.
Thanks!
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