81 lines
2.2 KiB
C
81 lines
2.2 KiB
C
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#include "ref.h"
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void ref_dct4_f32(const riscv_dct4_instance_f32 *S, float32_t *pState,
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float32_t *pInlineBuffer)
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{
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uint32_t n, k;
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float32_t sum;
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float32_t pi_by_N = 3.14159265358979f / (float32_t)S->N;
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float32_t tmp;
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float32_t normalize = sqrtf(2.0f / (float32_t)S->N);
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for (k = 0; k < S->N; k++) {
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sum = 0.0f;
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tmp = ((float32_t)k + 0.5f) * pi_by_N;
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for (n = 0; n < S->N; n++) {
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sum += pInlineBuffer[n] * cosf(tmp * ((float32_t)n + 0.5f));
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}
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scratchArray[k] = normalize * sum;
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}
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for (k = 0; k < S->N; k++) {
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pInlineBuffer[k] = scratchArray[k];
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}
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}
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void ref_dct4_q31(const riscv_dct4_instance_q31 *S, q31_t *pState,
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q31_t *pInlineBuffer)
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{
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riscv_dct4_instance_f32 SS;
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// float32_t *fSrc = (float32_t*)pInlineBuffer;
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float32_t fSrc[S->N];
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riscv_q31_to_float(pInlineBuffer, fSrc, S->N);
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uint32_t i;
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SS.N = S->N;
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for (i = 0; i < S->N; i++) {
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// read the q31 data, cast to float, scale down for float
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fSrc[i] = (float32_t)pInlineBuffer[i] / 2147483648.0f;
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}
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ref_dct4_f32(&SS, (float32_t *)0, fSrc);
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for (i = 0; i < S->N; i++) {
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fSrc[i] = fSrc[i] * 2147483648.0f / (float32_t)S->N;
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fSrc[i] += (fSrc[i] > 0) ? 0.5f : -0.5f;
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pInlineBuffer[i] = (q31_t)fSrc[i];
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}
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}
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void ref_dct4_q15(const riscv_dct4_instance_q15 *S, q15_t *pState,
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q15_t *pInlineBuffer)
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{
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riscv_dct4_instance_f32 SS;
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// float32_t *fSrc = (float32_t*)pInlineBuffer;
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float32_t fSrc[S->N];
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riscv_q15_to_float(pInlineBuffer, fSrc, S->N);
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uint32_t i;
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SS.N = S->N;
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for (i = 0; i < S->N; i++) {
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// read the q15 data, cast to float, scale down for float, place in
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// temporary buffer
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scratchArray[i] = (float32_t)pInlineBuffer[i] / 32768.0f;
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}
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for (i = 0; i < S->N; i++) {
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// copy from temp buffer to final buffer
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fSrc[i] = scratchArray[i];
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}
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ref_dct4_f32(&SS, (float32_t *)0, fSrc);
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for (i = 0; i < S->N; i++) {
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fSrc[i] = fSrc[i] * 32768.0f / (float32_t)S->N;
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fSrc[i] += (fSrc[i] > 0) ? 0.5f : -0.5f;
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pInlineBuffer[i] = (q15_t)fSrc[i];
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}
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}
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