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Fix I2S input down-sampling crosstalk

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Simplified and corrected array indexing used in DS3 calls.
This commit is contained in:
Sam Chesney
2017-02-09 12:05:57 +00:00
parent 0cd3e4de77
commit 96ccac033a
2 changed files with 27 additions and 21 deletions
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1
CHANGELOG.rst
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@@ -6,6 +6,7 @@ sc_usb_audio Change Log
- ADDED: UserBufferManagementInit() to reset any state required in UserBufferManagement()
- ADDED: I2S output up-sampling (I2S_UPSAMPLE_FACTOR_OUT)
- CHANGE: Rename I2S input down-sampling (I2S_DOWNSAMPLE_FACTOR to I2S_DOWNSAMPLE_FACTOR_IN)
- RESOLVED: Crosstalk between input channels when I2S input down-sampling is enabled
7.0.1
-----

47
module_usb_audio/audio_io/audio_io.xc
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@@ -702,27 +702,29 @@ int i2sOutUpsamplingCounter = 0;
#endif // I2S_MODE_TDM
#endif // CODEC_MASTER
/* Note the use of readBuffNo changes based on frameCount */
samplesIn[buffIndex][((frameCount-2)&(I2S_CHANS_PER_FRAME-1))+i] = bitrev(sample); // channels 0, 2, 4.. on each line.
sample = bitrev(sample);
int chanIndex = ((frameCount-2)&(I2S_CHANS_PER_FRAME-1))+i; // channels 0, 2, 4.. on each line.
#if (I2S_DOWNSAMPLE_FACTOR_IN > 1)
if ((I2S_DOWNSAMPLE_FACTOR_IN - 1) == i2sInDownsamplingCounter)
{
samplesIn[readBuffNo][((frameCount-2)&(I2S_CHANS_PER_FRAME-1))] =
samplesIn[buffIndex][chanIndex] =
src_ds3_voice_add_final_sample(
i2sInDs3Sum[((frameCount-2)&(I2S_CHANS_PER_FRAME-1))+i],
i2sInDs3.delayLine[((frameCount-2)&(I2S_CHANS_PER_FRAME-1))+i][i2sInDownsamplingCounter],
i2sInDs3Sum[chanIndex],
i2sInDs3.delayLine[chanIndex][i2sInDownsamplingCounter],
src_ff3v_fir_coefs[i2sInDownsamplingCounter],
samplesIn[readBuffNo][((frameCount-2)&(I2S_CHANS_PER_FRAME-1))]);
sample);
}
else
{
i2sInDs3Sum[((frameCount-2)&(I2S_CHANS_PER_FRAME-1))+i] =
i2sInDs3Sum[chanIndex] =
src_ds3_voice_add_sample(
i2sInDs3Sum[((frameCount-2)&(I2S_CHANS_PER_FRAME-1))+i],
i2sInDs3.delayLine[((frameCount-2)&(I2S_CHANS_PER_FRAME-1))+i][i2sInDownsamplingCounter],
src_ff3v_fir_coefs[i2sInDownsamplingCounter],
samplesIn[readBuffNo][((frameCount-2)&(I2S_CHANS_PER_FRAME-1))]);
i2sInDs3Sum[chanIndex],
i2sInDs3.delayLine[chanIndex][i2sInDownsamplingCounter],
src_ff3v_fir_coefs[i2sInDownsamplingCounter],
sample);
}
#else
samplesIn[buffIndex][chanIndex] = sample;
#endif // (I2S_DOWNSAMPLE_FACTOR_IN > 1)
}
#endif
@@ -852,26 +854,29 @@ int i2sOutUpsamplingCounter = 0;
#endif // I2S_MODE_TDM
#endif // CODEC_MASTER
samplesIn[buffIndex][((frameCount-1)&(I2S_CHANS_PER_FRAME-1))+i] = bitrev(sample); // channels 1, 3, 5.. on each line.
sample = bitrev(sample);
int chanIndex = ((frameCount-1)&(I2S_CHANS_PER_FRAME-1))+i; // channels 1, 3, 5.. on each line.
#if ((I2S_DOWNSAMPLE_FACTOR_IN > 1) && !I2S_DOWNSAMPLE_MONO_IN)
if ((I2S_DOWNSAMPLE_FACTOR_IN - 1) == i2sInDownsamplingCounter)
{
samplesIn[buffIndex][((frameCount-1)&(I2S_CHANS_PER_FRAME-1))+i] =
samplesIn[buffIndex][chanIndex] =
src_ds3_voice_add_final_sample(
i2sInDs3Sum[((frameCount-1)&(I2S_CHANS_PER_FRAME-1))+i],
i2sInDs3.delayLine[((frameCount-1)&(I2S_CHANS_PER_FRAME-1))+i][i2sInDownsamplingCounter],
i2sInDs3Sum[chanIndex],
i2sInDs3.delayLine[chanIndex][i2sInDownsamplingCounter],
src_ff3v_fir_coefs[i2sInDownsamplingCounter],
samplesIn[readBuffNo][((frameCount-1)&(I2S_CHANS_PER_FRAME-1))+i]);
sample);
}
else
{
i2sInDs3Sum[((frameCount-2)&(I2S_CHANS_PER_FRAME-1))+i] =
i2sInDs3Sum[chanIndex] =
src_ds3_voice_add_sample(
i2sInDs3Sum[((frameCount-1)&(I2S_CHANS_PER_FRAME-1))+i],
i2sInDs3.delayLine[((frameCount-1)&(I2S_CHANS_PER_FRAME-1))+i][i2sInDownsamplingCounter],
src_ff3v_fir_coefs[i2sInDownsamplingCounter],
samplesIn[readBuffNo][((frameCount-1)&(I2S_CHANS_PER_FRAME-1))+i]);
i2sInDs3Sum[chanIndex],
i2sInDs3.delayLine[chanIndex][i2sInDownsamplingCounter],
src_ff3v_fir_coefs[i2sInDownsamplingCounter],
sample);
}
#else
samplesIn[buffIndex][chanIndex] = sample;
#endif // ((I2S_DOWNSAMPLE_FACTOR_IN > 1) && !I2S_DOWNSAMPLE_MONO_IN)
}