7ab2a8305a
This reverts usage of the AVFoundation output to use the previous lower latency CoreAudio output, and paves the way for a change I am cooking up soon. Fixes several issues with playback and seeking latency. Signed-off-by: Christopher Snowhill <kode54@gmail.com>
40 lines
1.8 KiB
C
40 lines
1.8 KiB
C
#ifndef MY_LPC_H
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#define MY_LPC_H
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/* data - beginning of the data
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* data_len - length of data (in samples) that are base for extrapolation
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* nch - number of (interleaved) channels
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* lpc_order - LPC order
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* extra_bkwd - number of samples to pre-extrapolate
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* extra_fwd - number of samples to post-extrapolate
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*
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* D = data; N = num_channels; LEN = data_len*N; EX = extra*N
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*
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* memory layout when invdir == false:
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*
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* [||||||||||||||||||||||||||||||||][||||||||||||||||||||][
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* ^ D[0] ^ D[LEN] ^ D[LEN+EX]
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*
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* memory layout when invdir == true:
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* ][||||||||||||||||||||][||||||||||||||||||||||||||||||||][
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* ^ D[0] ^ D[LEN]
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* ^ D[-1*N-EX] ^ D[-1*N]
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*
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*/
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static const size_t LPC_ORDER = 32;
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void lpc_extrapolate2(float * const data, const size_t data_len, const int nch, const int lpc_order, const size_t extra_bkwd, const size_t extra_fwd, void ** extrapolate_buffer, size_t * extrapolate_buffer_size);
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static inline void lpc_extrapolate_bkwd(float * const data, const size_t data_len, const size_t prime_len, const int nch, const int lpc_order, const size_t extra_bkwd, void ** extrapolate_buffer, size_t * extrapolate_buffer_size)
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{
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(void)data_len;
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lpc_extrapolate2(data, prime_len, nch, lpc_order, extra_bkwd, 0, extrapolate_buffer, extrapolate_buffer_size);
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}
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static inline void lpc_extrapolate_fwd(float * const data, const size_t data_len, const size_t prime_len, const int nch, const int lpc_order, const size_t extra_fwd, void ** extrapolate_buffer, size_t * extrapolate_buffer_size)
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{
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lpc_extrapolate2(data + (data_len - prime_len)*nch, prime_len, nch, lpc_order, 0, extra_fwd, extrapolate_buffer, extrapolate_buffer_size);
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}
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#endif
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