diff options
Diffstat (limited to 'cras/src/dsp/drc.c')
-rw-r--r-- | cras/src/dsp/drc.c | 396 |
1 files changed, 0 insertions, 396 deletions
diff --git a/cras/src/dsp/drc.c b/cras/src/dsp/drc.c deleted file mode 100644 index e6098419..00000000 --- a/cras/src/dsp/drc.c +++ /dev/null @@ -1,396 +0,0 @@ -/* Copyright (c) 2013 The Chromium OS Authors. All rights reserved. - * Use of this source code is governed by a BSD-style license that can be - * found in the LICENSE file. - */ - -/* Copyright (C) 2011 Google Inc. All rights reserved. - * Use of this source code is governed by a BSD-style license that can be - * found in the LICENSE.WEBKIT file. - */ - -#include <assert.h> -#include <stdlib.h> - -#include "drc.h" -#include "drc_math.h" - -static void set_default_parameters(struct drc *drc); -static void init_data_buffer(struct drc *drc); -static void init_emphasis_eq(struct drc *drc); -static void init_crossover(struct drc *drc); -static void init_kernel(struct drc *drc); -static void free_data_buffer(struct drc *drc); -static void free_emphasis_eq(struct drc *drc); -static void free_kernel(struct drc *drc); - -struct drc *drc_new(float sample_rate) -{ - struct drc *drc = (struct drc *)calloc(1, sizeof(struct drc)); - drc->sample_rate = sample_rate; - set_default_parameters(drc); - return drc; -} - -void drc_init(struct drc *drc) -{ - init_data_buffer(drc); - init_emphasis_eq(drc); - init_crossover(drc); - init_kernel(drc); -} - -void drc_free(struct drc *drc) -{ - free_kernel(drc); - free_emphasis_eq(drc); - free_data_buffer(drc); - free(drc); -} - -/* Allocates temporary buffers used during drc_process(). */ -static void init_data_buffer(struct drc *drc) -{ - int i; - size_t size = sizeof(float) * DRC_PROCESS_MAX_FRAMES; - - for (i = 0; i < DRC_NUM_CHANNELS; i++) { - drc->data1[i] = (float *)calloc(1, size); - drc->data2[i] = (float *)calloc(1, size); - } -} - -/* Frees temporary buffers */ -static void free_data_buffer(struct drc *drc) -{ - int i; - - for (i = 0; i < DRC_NUM_CHANNELS; i++) { - free(drc->data1[i]); - free(drc->data2[i]); - } -} - -void drc_set_param(struct drc *drc, int index, unsigned paramID, float value) -{ - assert(paramID < PARAM_LAST); - if (paramID < PARAM_LAST) - drc->parameters[index][paramID] = value; -} - -static float drc_get_param(struct drc *drc, int index, unsigned paramID) -{ - assert(paramID < PARAM_LAST); - return drc->parameters[index][paramID]; -} - -/* Initializes parameters to default values. */ -static void set_default_parameters(struct drc *drc) -{ - float nyquist = drc->sample_rate / 2; - int i; - - for (i = 0; i < DRC_NUM_KERNELS; i++) { - float *param = drc->parameters[i]; - param[PARAM_THRESHOLD] = -24; /* dB */ - param[PARAM_KNEE] = 30; /* dB */ - param[PARAM_RATIO] = 12; /* unit-less */ - param[PARAM_ATTACK] = 0.003f; /* seconds */ - param[PARAM_RELEASE] = 0.250f; /* seconds */ - param[PARAM_PRE_DELAY] = DRC_DEFAULT_PRE_DELAY; /* seconds */ - - /* Release zone values 0 -> 1. */ - param[PARAM_RELEASE_ZONE1] = 0.09f; - param[PARAM_RELEASE_ZONE2] = 0.16f; - param[PARAM_RELEASE_ZONE3] = 0.42f; - param[PARAM_RELEASE_ZONE4] = 0.98f; - - /* This is effectively a main volume on the compressed - * signal */ - param[PARAM_POST_GAIN] = 0; /* dB */ - param[PARAM_ENABLED] = 0; - } - - drc->parameters[0][PARAM_CROSSOVER_LOWER_FREQ] = 0; - drc->parameters[1][PARAM_CROSSOVER_LOWER_FREQ] = 200 / nyquist; - drc->parameters[2][PARAM_CROSSOVER_LOWER_FREQ] = 2000 / nyquist; - - /* These parameters has only one copy */ - drc->parameters[0][PARAM_FILTER_STAGE_GAIN] = 4.4f; /* dB */ - drc->parameters[0][PARAM_FILTER_STAGE_RATIO] = 2; - drc->parameters[0][PARAM_FILTER_ANCHOR] = 15000 / nyquist; -} - -/* Finds the zero and pole for one stage of the emphasis filter */ -static void emphasis_stage_roots(float gain, float normalized_frequency, - float *zero, float *pole) -{ - float gk = 1 - gain / 20; - float f1 = normalized_frequency * gk; - float f2 = normalized_frequency / gk; - *zero = expf(-f1 * PI_FLOAT); - *pole = expf(-f2 * PI_FLOAT); -} - -/* Calculates the biquad coefficients for two emphasis stages. */ -static void emphasis_stage_pair_biquads(float gain, float f1, float f2, - struct biquad *emphasis, - struct biquad *deemphasis) -{ - float z1, p1; - float z2, p2; - - emphasis_stage_roots(gain, f1, &z1, &p1); - emphasis_stage_roots(gain, f2, &z2, &p2); - - float b0 = 1; - float b1 = -(z1 + z2); - float b2 = z1 * z2; - float a0 = 1; - float a1 = -(p1 + p2); - float a2 = p1 * p2; - - /* Gain compensation to make 0dB @ 0Hz */ - float alpha = (a0 + a1 + a2) / (b0 + b1 + b2); - - emphasis->b0 = b0 * alpha; - emphasis->b1 = b1 * alpha; - emphasis->b2 = b2 * alpha; - emphasis->a1 = a1; - emphasis->a2 = a2; - - float beta = (b0 + b1 + b2) / (a0 + a1 + a2); - - deemphasis->b0 = a0 * beta; - deemphasis->b1 = a1 * beta; - deemphasis->b2 = a2 * beta; - deemphasis->a1 = b1; - deemphasis->a2 = b2; -} - -/* Initializes the emphasis and deemphasis filter */ -static void init_emphasis_eq(struct drc *drc) -{ - struct biquad e = { 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f }; - struct biquad d = { 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f }; - int i, j; - - float stage_gain = drc_get_param(drc, 0, PARAM_FILTER_STAGE_GAIN); - float stage_ratio = drc_get_param(drc, 0, PARAM_FILTER_STAGE_RATIO); - float anchor_freq = drc_get_param(drc, 0, PARAM_FILTER_ANCHOR); - - drc->emphasis_eq = eq2_new(); - drc->deemphasis_eq = eq2_new(); - - for (i = 0; i < 2; i++) { - emphasis_stage_pair_biquads(stage_gain, anchor_freq, - anchor_freq / stage_ratio, &e, &d); - for (j = 0; j < 2; j++) { - eq2_append_biquad_direct(drc->emphasis_eq, j, &e); - eq2_append_biquad_direct(drc->deemphasis_eq, j, &d); - } - anchor_freq /= (stage_ratio * stage_ratio); - } -} - -/* Frees the emphasis and deemphasis filter */ -static void free_emphasis_eq(struct drc *drc) -{ - eq2_free(drc->emphasis_eq); - eq2_free(drc->deemphasis_eq); -} - -/* Initializes the crossover filter */ -static void init_crossover(struct drc *drc) -{ - float freq1 = drc->parameters[1][PARAM_CROSSOVER_LOWER_FREQ]; - float freq2 = drc->parameters[2][PARAM_CROSSOVER_LOWER_FREQ]; - - crossover2_init(&drc->xo2, freq1, freq2); -} - -/* Initializes the compressor kernels */ -static void init_kernel(struct drc *drc) -{ - int i; - - for (i = 0; i < DRC_NUM_KERNELS; i++) { - dk_init(&drc->kernel[i], drc->sample_rate); - - float db_threshold = drc_get_param(drc, i, PARAM_THRESHOLD); - float db_knee = drc_get_param(drc, i, PARAM_KNEE); - float ratio = drc_get_param(drc, i, PARAM_RATIO); - float attack_time = drc_get_param(drc, i, PARAM_ATTACK); - float release_time = drc_get_param(drc, i, PARAM_RELEASE); - float pre_delay_time = drc_get_param(drc, i, PARAM_PRE_DELAY); - float releaseZone1 = drc_get_param(drc, i, PARAM_RELEASE_ZONE1); - float releaseZone2 = drc_get_param(drc, i, PARAM_RELEASE_ZONE2); - float releaseZone3 = drc_get_param(drc, i, PARAM_RELEASE_ZONE3); - float releaseZone4 = drc_get_param(drc, i, PARAM_RELEASE_ZONE4); - float db_post_gain = drc_get_param(drc, i, PARAM_POST_GAIN); - int enabled = drc_get_param(drc, i, PARAM_ENABLED); - - dk_set_parameters(&drc->kernel[i], db_threshold, db_knee, ratio, - attack_time, release_time, pre_delay_time, - db_post_gain, releaseZone1, releaseZone2, - releaseZone3, releaseZone4); - - dk_set_enabled(&drc->kernel[i], enabled); - } -} - -/* Frees the compressor kernels */ -static void free_kernel(struct drc *drc) -{ - int i; - for (i = 0; i < DRC_NUM_KERNELS; i++) - dk_free(&drc->kernel[i]); -} - -// Note gcc 4.9+ with -O2 on aarch64 produces vectorized version of C -// that is comparable performance, but twice as large. -O1 and -Os produce -// small but slower code (4x slower than Neon). -#if defined(__aarch64__) -static void sum3(float *data, const float *data1, const float *data2, int n) -{ - int count = n / 4; - int i; - - if (count) { - // clang-format off - __asm__ __volatile( - "1: \n" - "ld1 {v0.4s}, [%[data1]], #16 \n" - "ld1 {v1.4s}, [%[data2]], #16 \n" - "ld1 {v2.4s}, [%[data]] \n" - "fadd v0.4s, v0.4s, v1.4s \n" - "fadd v0.4s, v0.4s, v2.4s \n" - "st1 {v0.4s}, [%[data]], #16 \n" - "subs %w[count], %w[count], #1 \n" - "b.ne 1b \n" - : /* output */ - [data]"+r"(data), - [data1]"+r"(data1), - [data2]"+r"(data2), - [count]"+r"(count) - : /* input */ - : /* clobber */ - "v0", "v1", "v2", "memory", "cc"); - // clang-format on - } - - n &= 3; - for (i = 0; i < n; i++) - data[i] += data1[i] + data2[i]; -} -#elif defined(__ARM_NEON__) -static void sum3(float *data, const float *data1, const float *data2, int n) -{ - int count = n / 4; - int i; - - if (count) { - // clang-format off - __asm__ __volatile( - "1: \n" - "vld1.32 {q0}, [%[data1]]! \n" - "vld1.32 {q1}, [%[data2]]! \n" - "vld1.32 {q2}, [%[data]] \n" - "vadd.f32 q0, q0, q1 \n" - "vadd.f32 q0, q0, q2 \n" - "vst1.32 {q0}, [%[data]]! \n" - "subs %[count], #1 \n" - "bne 1b \n" - : /* output */ - [data]"+r"(data), - [data1]"+r"(data1), - [data2]"+r"(data2), - [count]"+r"(count) - : /* input */ - : /* clobber */ - "q0", "q1", "q2", "memory", "cc"); - // clang-format on - } - - n &= 3; - for (i = 0; i < n; i++) - data[i] += data1[i] + data2[i]; -} -#elif defined(__SSE3__) -#include <emmintrin.h> -static void sum3(float *data, const float *data1, const float *data2, int n) -{ - __m128 x, y, z; - int count = n / 4; - int i; - - if (count) { - // clang-format off - __asm__ __volatile( - "1: \n" - "lddqu (%[data1]), %[x] \n" - "lddqu (%[data2]), %[y] \n" - "lddqu (%[data]), %[z] \n" - "addps %[x], %[y] \n" - "addps %[y], %[z] \n" - "movdqu %[z], (%[data]) \n" - "add $16, %[data1] \n" - "add $16, %[data2] \n" - "add $16, %[data] \n" - "sub $1, %[count] \n" - "jne 1b \n" - : /* output */ - [data]"+r"(data), - [data1]"+r"(data1), - [data2]"+r"(data2), - [count]"+r"(count), - [x]"=x"(x), - [y]"=x"(y), - [z]"=x"(z) - : /* input */ - : /* clobber */ - "memory", "cc"); - // clang-format on - } - - n &= 3; - for (i = 0; i < n; i++) - data[i] += data1[i] + data2[i]; -} -#else -static void sum3(float *data, const float *data1, const float *data2, int n) -{ - int i; - for (i = 0; i < n; i++) - data[i] += data1[i] + data2[i]; -} -#endif - -void drc_process(struct drc *drc, float **data, int frames) -{ - int i; - float **data1 = drc->data1; - float **data2 = drc->data2; - - /* Apply pre-emphasis filter if it is not disabled. */ - if (!drc->emphasis_disabled) - eq2_process(drc->emphasis_eq, data[0], data[1], frames); - - /* Crossover */ - crossover2_process(&drc->xo2, frames, data[0], data[1], data1[0], - data1[1], data2[0], data2[1]); - - /* Apply compression to each band of the signal. The processing is - * performed in place. - */ - dk_process(&drc->kernel[0], data, frames); - dk_process(&drc->kernel[1], data1, frames); - dk_process(&drc->kernel[2], data2, frames); - - /* Sum the three bands of signal */ - for (i = 0; i < DRC_NUM_CHANNELS; i++) - sum3(data[i], data1[i], data2[i], frames); - - /* Apply de-emphasis filter if emphasis is not disabled. */ - if (!drc->emphasis_disabled) - eq2_process(drc->deemphasis_eq, data[0], data[1], frames); -} |