Audio: SRC: Patches to produce more steady data flow with 48 kHz to 11.025 kHz conversion #10158
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The 2nd stage of the sample rate converter may not produce data if the internal processing block is longer than output frames count in a period. E.g. in 48 to 11.025 kHz capture the first two copy() operations are not producing data to sink. Producing the zeros can prevent xruns in the downstream pipeline. Signed-off-by: Seppo Ingalsuo <seppo.ingalsuo@linux.intel.com>
The conversion from 48 to 11.025 kHz was done with fractions 21/80 * 7/8. With denominator 80 in the first fraction the first stage of SRC needed 80 input frames to consume source buffer produce output internally. The change to fractions 7/20 * 21/32 helps to start consuming source buffer in the first copy. However due to 32 frames (at intermediate 16.8 kHz) need for second stage to process the sink buffer fill starts still after two copies. It is addressed in another patch. The change also impacts conversion 192 to 44.1 kHz and 96 kHz to 22.05 kHz. This change only impact the coefficients generator. The actual coefficients change is in the next patch. Signed-off-by: Seppo Ingalsuo <seppo.ingalsuo@linux.intel.com>
This change updates the actual coefficients for changed fractions for 11.025 kHz. The purpose of the change is to consume and produce slightly data with less jitter in amount of data. Signed-off-by: Seppo Ingalsuo <seppo.ingalsuo@linux.intel.com>
singalsu
commented
Aug 8, 2025
| #include "src_ipc4_int32_21_32_4535_5000.h" | ||
| #include "src_ipc4_int32_21_40_2381_5000.h" | ||
| #include "src_ipc4_int32_21_40_3968_5000.h" | ||
| #include "src_ipc4_int32_21_80_3968_5000.h" |
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Should git rm this header that is not needed.
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Seems this change is not needed, another simpler tplg patch works. |
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This PR is not yet sufficient alone to fix occasional glitches in 11.025 kHz capture but has been needed in workarounds where glitches were not observed (add volume component between host-copier and SRC or maximize every 1ms done host DMA transfer sizes).