127 lines
4.1 KiB
C
127 lines
4.1 KiB
C
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/*
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******************************************************************
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* Limiter_NoiseGate Module(限幅器/噪声门限模块)
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*1. Limiter:限制最大幅度
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*2. NoiseGate:
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*(1)启动时间
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*(2)释放时间
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*(3)噪声阈值
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*(4)噪声增益
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*3. Usage:
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*(1)LIMITER_THR:限幅器参数，限制信号的最大值
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*(2)LIMITER_NOISE_GATE:噪声门限的阈值，配合LIMITER_NOISE_GAIN使用
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*(3)LIMITER_NOISE_GAIN:当信号小于噪声门限LIMITER_NOISE_GATE的时候
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*信号增益为LIMITER_NOISE_GAIN，范围是0到1，增益0为静音，增益1为直通
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*效果。噪声门限用来优化声音的底噪
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******************************************************************
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*/
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#include "system/includes.h"
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#include "os/os_api.h"
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#include "limiter_noiseGate_api.h"
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#include "audio_noise_gate.h"
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//#define NG_LOG_ENABLE
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#ifdef NG_LOG_ENABLE
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#define NG_LOG y_printf
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#else
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#define NG_LOG(...)
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#endif/*NG_LOG_ENABLE*/
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/*限幅器上限*/
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#define LIMITER_THR -10000 /*-12000 = -12dB,放大1000倍,(-10000参考)*/
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/*小于CONST_NOISE_GATE的当成噪声处理,防止清0近端声音*/
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#define LIMITER_NOISE_GATE -40000 /*-12000 = -12dB,放大1000倍,(-40000参考)*/
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/*低于噪声门限阈值的增益 */
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#define LIMITER_NOISE_GAIN (0 << 30) /*(0~1)*2^30*/
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enum {
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NG_STA_CLOSE = 0,
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NG_STA_OPEN,
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NG_STA_RUN,
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};
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typedef struct {
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u8 state;
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OS_MUTEX mutex;
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u8 *run_buf;
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} audio_noise_gate_t;
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audio_noise_gate_t NoiseGate;
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int audio_noise_gate_open(u16 sample_rate, int limiter_thr, int noise_gate, int noise_gain)
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{
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NG_LOG("audio_noise_gate_open");
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NoiseGate.run_buf = malloc(need_limiter_noiseGate_buf(1));
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NG_LOG("Limiter_noisegate_buf size:%d\n", need_limiter_noiseGate_buf(1));
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if (NoiseGate.run_buf) {
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//限幅器启动因子 int32(exp(-0.65/(16000 * 0.005))*2^30) 16000为采样率 0.005 为启动时间(s)
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int limiter_attfactor = 1065053018;
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//限幅器释放因子 int32(exp(-0.15/(16000 * 0.1))*2^30) 16000为采样率 0.1 为释放时间(s)
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int limiter_relfactor = 1073641165;
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//限幅器阈值(mdb)
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//int limiter_threshold = CONST_LIMITER_THR;
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//噪声门限启动因子 int32(exp(-1/(16000 * 0.1))*2^30) 16000为采样率 0.1 为启动时间(s)
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/*
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*import math
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*int(math.exp(-1.0/(16000*0.1))*2**30)
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*/
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int noiseGate_attfactor = 1073070945;
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//噪声门限释放因子 int32(exp(-1/(16000 * 0.005))*2^30) 16000为采样率 0.005 为释放时间(s)
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int noiseGate_relfactor = 1060403589;
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//噪声门限(mdb)
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//int noiseGate_threshold = -25000;
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//低于噪声门限阈值的增益 (0~1)*2^30
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//int noise
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//Gate_low_thr_gain = 0 << 30;
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if (sample_rate == 8000) {
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limiter_attfactor = 1056434522;
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limiter_relfactor = 1073540516;
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noiseGate_attfactor = 1072400485;
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noiseGate_relfactor = 1047231044;
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}
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limiter_noiseGate_init(NoiseGate.run_buf,
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limiter_attfactor,
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limiter_relfactor,
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noiseGate_attfactor,
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noiseGate_relfactor,
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limiter_thr,
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noise_gate,
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noise_gain,
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sample_rate, 1);
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os_mutex_create(&NoiseGate.mutex);
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NoiseGate.state = NG_STA_OPEN;
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NG_LOG("audio_noise_gate_open succ");
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return 0;
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}
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return -ENOMEM;
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}
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void audio_noise_gate_run(void *in, void *out, u16 len)
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{
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if (NoiseGate.state == NG_STA_CLOSE) {
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return;
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}
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os_mutex_pend(&NoiseGate.mutex, 0);
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if (NoiseGate.run_buf) {
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limiter_noiseGate_run(NoiseGate.run_buf, in, out, len / 2);
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}
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os_mutex_post(&NoiseGate.mutex);
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}
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void audio_noise_gate_close()
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{
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NG_LOG("audio_noise_gate_close");
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os_mutex_pend(&NoiseGate.mutex, 0);
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NoiseGate.state = NG_STA_CLOSE;
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if (NoiseGate.run_buf) {
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free(NoiseGate.run_buf);
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}
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os_mutex_post(&NoiseGate.mutex);
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NG_LOG("audio_noise_gate_close succ");
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}
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