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A2B: Add A2B Tx streaming support

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A2B: Add A2BDecoder for streaming wave to A2B device
RADA2B: Add functions to configure settings
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Yasser Yassine
2023-03-08 18:22:14 +00:00
parent 539cfa511b
commit ddee1254a0
12 changed files with 1145 additions and 523 deletions
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docs/Usage.rst
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@@ -105,14 +105,13 @@ A2B Wave Output
~~~~~~~~~~~~~~~~~~~~
Users may add a ``icsneo::A2BWAVOutput`` message callback to their device in order to write A2B PCM data to a WAVE file. The message callback listens for ``icsneo::A2BMessage``
messages and writes both downstream and upstream channels to a single wave file. If downstream and upstream each have ``32`` channels, the wave file will contain ``2*32 = 64``
total channels. The first half of the channels, channels ``0-31`` in the outputted wave file, represent downstream channel ``0-31``. Likewise, the second half of the channels,
channels ``32-63`` in the outputted wave file, represent upstream channel ``0-31``. Let ``NUM_CHANNELS`` be the total number of channels in a single stream. If we introduce a
variable ``IS_UPSTREAM`` which is ``0`` when downstream and ``1`` when upstream and desired a channel ``CHANNEL_NUM`` in either downstream or upstream the
channel ``IS_UPSTREAM * NUM_CHANNELS + CHANNEL_NUM`` would correspond to the channel in the outputted wave file.
total channels. Channels are indexed at 0 and interleaved such that downstream are on even number channels and upstream on odd number channels. If we introduce a
variable ``IS_UPSTREAM`` which is ``0`` when downstream and ``1`` when upstream and desired a channel ``CHANNEL_NUM`` the corresponding channel in the wave file would be
``2*CHANNEL_NUM + IS_UPSTREAM``.
Wave files may be split by channel using programs such as ``FFmpeg``. Consider a file ``out.wav`` which was generated using a ``icsneo::A2BWAVOutput`` object
and contains ``32`` channels per stream. The ``icsneo::A2BWavoutput`` object injested PCM data with a sample rate of ``44.1 kHz`` and bit depth of ``24``. The corresponding
channel of upstream channel ``8`` in ``out.wav`` would be ``1*32 + 8 = 40``. The following ``FFmpeg`` command may be ran in a linux environment to create a new wave
channel of upstream channel ``8`` in ``out.wav`` would be ``2*CHANNEL_NUM + IS_UPSTREAM = 2*8 + 1 = 17``. The following ``FFmpeg`` command may be ran in a linux environment to create a new wave
file ``out_upstream_ch8.wav`` which contains only PCM samples off of upstream channel ``8``.
``ffmpeg -i out.wav -ar 44100 -acodec pcm_s24le -map_channel 0.0.40 out_upstream_ch8.wav``
``ffmpeg -i out.wav -ar 44100 -acodec pcm_s24le -map_channel 0.0.17 out_upstream_ch8.wav``