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libsamplerate 0.1.2 didn't have the 32 bit <-> float conversion
routines. Emulate them in case they aren't supported.
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Similar to pcm_resample_16(), implement pcm_resample_24(). The 24 bit
implementation is very similar, but it uses src_int_to_float_array()
instead of src_short_to_float_array() before sending data to
libsamplerate.
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A future patch will implement a 24 bit resampler. To unify code, move
code which can be shared to a separate function.
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Added assertions which ensure that there are no partial samples in the
source buffer.
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Use sizeof(sample) instead of hard-coding "2". Although we're in 16
bit right now, this will make code sharing easier when we support
other sample sizes.
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Separate the resampling code from the rest of pcm_utils.c. Create two
sub-libraries: pcm_resample_libsamplerate.c and
pcm_resample_fallback.c.
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