Re: [Discuss-gnuradio] Audio data types

[Eric Blossom]

On Wed, Jul 13, 2005 at 02:42:52PM -0600, David R. Palchak wrote:
> Is there currently anything like an audio.source_s() block
> that produces 16-bit samples at a specified rate?  If not,
> how might one go about implementing such a block using the
> existing audio code?
> 
> Thanks,
> David Palchak

Here's a block that will handle a single (mono) output stream.

from gnuradio import gr
from gnuradio import audio

class audio_source_s(gr.hier_block):
    """
    audio source that produces a single stream of shorts
    """
    def __init__(self, fg, sample_rate, pcm_device=""):
        """
        @param fg:           flow_graph
        @param sample_rate:  audio sample rate
        @param pcm_device:   optional audio device name, e.g., hw:0,0 or 
/dev/dsp

        """
        src = audio.source(sample_rate, pcm_device)
        scale = gr.multiply_const_ff(32768.0)
        f2s = gr.float_to_short()
        fg.connect(src, scale, f2s)
        gr.hier_block.__init__(self, fg, src, f2s)