mirror/miniaudio
1
0
Fork 0
mirror of https://github.com/mackron/miniaudio.git synced 2026-04-24 09:14:04 +02:00
Code Issues Packages Projects Releases Wiki Activity

Add support for reinitialization of low-pass and biquad filters.

Browse Source
This commit is contained in:
David Reid
2020-01-20 19:01:42 +10:00
parent 5d0f21448e
commit 811e438d1b
2 changed files with 69 additions and 29 deletions
Download Patch File Download Diff File Expand all files Collapse all files
research/ma_resampler.h
+14 -15
View File
@@ -269,24 +269,18 @@ ma_resampler_config ma_resampler_config_init(ma_format format, ma_uint32 channel
return config;
}
static ma_result ma_resampler__init_lpf(ma_resampler* pResampler)
static ma_lpf_config ma_resampler_create_lpf_config(ma_resampler* pResampler)
{
ma_result result;
ma_lpf_config lpfConfig;
ma_lpf_config config;
pResampler->state.linear.t = -1; /* This must be set to -1 for the linear backend. It's used to indicate that the first frame needs to be loaded. */
MA_ASSERT(pResampler != NULL);
lpfConfig = ma_lpf_config_init(pResampler->config.format, pResampler->config.channels, pResampler->config.sampleRateOut, pResampler->config.linear.lpfCutoffFrequency);
if (lpfConfig.cutoffFrequency == 0) {
lpfConfig.cutoffFrequency = ma_min(pResampler->config.sampleRateIn, pResampler->config.sampleRateOut) / 2;
config = ma_lpf_config_init(pResampler->config.format, pResampler->config.channels, pResampler->config.sampleRateOut, pResampler->config.linear.lpfCutoffFrequency);
if (config.cutoffFrequency == 0) {
config.cutoffFrequency = ma_min(pResampler->config.sampleRateIn, pResampler->config.sampleRateOut) / 2;
}
result = ma_lpf_init(&lpfConfig, &pResampler->state.linear.lpf);
if (result != MA_SUCCESS) {
return result;
}
return MA_SUCCESS;
return config;
}
ma_result ma_resampler_init(const ma_resampler_config* pConfig, ma_resampler* pResampler)
@@ -317,7 +311,8 @@ ma_result ma_resampler_init(const ma_resampler_config* pConfig, ma_resampler* pR
pResampler->state.linear.t = -1;
if (pConfig->linear.enableLPF) {
result = ma_resampler__init_lpf(pResampler);
ma_lpf_config lpfConfig = ma_resampler_create_lpf_config(pResampler);
result = ma_lpf_init(&lpfConfig, &pResampler->state.linear.lpf);
if (result != MA_SUCCESS) {
return result;
}
@@ -802,7 +797,11 @@ ma_result ma_resampler_set_rate(ma_resampler* pResampler, ma_uint32 sampleRateIn
{
/* If we are using low-pass filtering we need to reinitialize the filter since it depends on the sample rate. */
if (pResampler->config.linear.enableLPF) {
ma_resampler__init_lpf(pResampler);
ma_lpf_config lpfConfig = ma_resampler_create_lpf_config(pResampler);
ma_result result = ma_lpf_reinit(&lpfConfig, &pResampler->state.linear.lpf);
if (result != MA_SUCCESS) {
return result; /* Failed to reinitialize the low-pass filter. */
}
}
} break;