mirror of
https://github.com/mackron/miniaudio.git
synced 2026-04-24 01:04:02 +02:00
Add ma_lpf with support for configuring the number of poles.
This commit is contained in:
David Reid
+233
@@ -1536,6 +1536,10 @@ typedef int ma_result;
|
||||
#define MA_MIN_SAMPLE_RATE MA_SAMPLE_RATE_8000
|
||||
#define MA_MAX_SAMPLE_RATE MA_SAMPLE_RATE_384000
|
||||
|
||||
#ifndef MA_MAX_FILTER_POLES
|
||||
#define MA_MAX_FILTER_POLES 8
|
||||
#endif
|
||||
|
||||
typedef enum
|
||||
{
|
||||
ma_stream_format_pcm = 0
|
||||
@@ -1691,6 +1695,33 @@ ma_result ma_lpf2_process_pcm_frames(ma_lpf2* pLPF, void* pFramesOut, const void
|
||||
ma_uint32 ma_lpf2_get_latency(ma_lpf2* pLPF);
|
||||
|
||||
|
||||
typedef struct
|
||||
{
|
||||
ma_format format;
|
||||
ma_uint32 channels;
|
||||
ma_uint32 sampleRate;
|
||||
double cutoffFrequency;
|
||||
ma_uint32 poles; /* If set to 0, will be treated as a passthrough (no filtering will be applied). */
|
||||
} ma_lpf_config;
|
||||
|
||||
ma_lpf_config ma_lpf_config_init(ma_format format, ma_uint32 channels, ma_uint32 sampleRate, double cutoffFrequency, ma_uint32 poles);
|
||||
|
||||
typedef struct
|
||||
{
|
||||
ma_format format;
|
||||
ma_uint32 channels;
|
||||
ma_uint32 lpf2Count;
|
||||
ma_uint32 lpf1Count;
|
||||
ma_lpf2 lpf2[MA_MAX_FILTER_POLES/2];
|
||||
ma_lpf1 lpf1[1];
|
||||
} ma_lpf;
|
||||
|
||||
ma_result ma_lpf_init(const ma_lpf_config* pConfig, ma_lpf* pLPF);
|
||||
ma_result ma_lpf_reinit(const ma_lpf_config* pConfig, ma_lpf* pLPF);
|
||||
ma_result ma_lpf_process_pcm_frames(ma_lpf* pLPF, void* pFramesOut, const void* pFramesIn, ma_uint64 frameCount);
|
||||
ma_uint32 ma_lpf_get_latency(ma_lpf* pLPF);
|
||||
|
||||
|
||||
/**************************************************************************************************************************************************************
|
||||
|
||||
High-Pass Filtering
|
||||
@@ -29592,6 +29623,208 @@ ma_uint32 ma_lpf2_get_latency(ma_lpf2* pLPF)
|
||||
}
|
||||
|
||||
|
||||
ma_lpf_config ma_lpf_config_init(ma_format format, ma_uint32 channels, ma_uint32 sampleRate, double cutoffFrequency, ma_uint32 poles)
|
||||
{
|
||||
ma_lpf_config config;
|
||||
|
||||
MA_ZERO_OBJECT(&config);
|
||||
config.format = format;
|
||||
config.channels = channels;
|
||||
config.sampleRate = sampleRate;
|
||||
config.cutoffFrequency = cutoffFrequency;
|
||||
config.poles = ma_min(poles, MA_MAX_FILTER_POLES);
|
||||
|
||||
return config;
|
||||
}
|
||||
|
||||
static ma_result ma_lpf_reinit__internal(const ma_lpf_config* pConfig, ma_lpf* pLPF, ma_bool32 isNew)
|
||||
{
|
||||
ma_result result;
|
||||
ma_uint32 lpf2Count;
|
||||
ma_uint32 lpf1Count;
|
||||
ma_uint32 ilpf2;
|
||||
ma_uint32 ilpf1;
|
||||
|
||||
if (pLPF == NULL || pConfig == NULL) {
|
||||
return MA_INVALID_ARGS;
|
||||
}
|
||||
|
||||
if (pConfig->poles > MA_MAX_FILTER_POLES) {
|
||||
return MA_INVALID_ARGS;
|
||||
}
|
||||
|
||||
/* Only supporting f32 and s16. */
|
||||
if (pConfig->format != ma_format_f32 && pConfig->format != ma_format_s16) {
|
||||
return MA_INVALID_ARGS;
|
||||
}
|
||||
|
||||
/* The format cannot be changed after initialization. */
|
||||
if (pLPF->format != ma_format_unknown && pLPF->format != pConfig->format) {
|
||||
return MA_INVALID_OPERATION;
|
||||
}
|
||||
|
||||
/* The channel count cannot be changed after initialization. */
|
||||
if (pLPF->channels != 0 && pLPF->channels != pConfig->channels) {
|
||||
return MA_INVALID_OPERATION;
|
||||
}
|
||||
|
||||
pLPF->format = pConfig->format;
|
||||
pLPF->channels = pConfig->channels;
|
||||
|
||||
|
||||
lpf2Count = pConfig->poles / 2;
|
||||
lpf1Count = pConfig->poles % 2;
|
||||
|
||||
MA_ASSERT(lpf2Count <= ma_countof(pLPF->lpf2));
|
||||
MA_ASSERT(lpf1Count <= ma_countof(pLPF->lpf1));
|
||||
|
||||
/* The pole count can't change between reinits. */
|
||||
if (!isNew) {
|
||||
if (pLPF->lpf2Count != lpf2Count || pLPF->lpf1Count != lpf1Count) {
|
||||
return MA_INVALID_OPERATION;
|
||||
}
|
||||
}
|
||||
|
||||
for (ilpf2 = 0; ilpf2 < lpf2Count; ilpf2 += 1) {
|
||||
ma_lpf2_config lpf2Config = ma_lpf2_config_init(pConfig->format, pConfig->channels, pConfig->sampleRate, pConfig->cutoffFrequency);
|
||||
|
||||
if (isNew) {
|
||||
result = ma_lpf2_init(&lpf2Config, &pLPF->lpf2[ilpf2]);
|
||||
} else {
|
||||
result = ma_lpf2_reinit(&lpf2Config, &pLPF->lpf2[ilpf2]);
|
||||
}
|
||||
|
||||
if (result != MA_SUCCESS) {
|
||||
return result;
|
||||
}
|
||||
}
|
||||
|
||||
for (ilpf1 = 0; ilpf1 < lpf1Count; ilpf1 += 1) {
|
||||
ma_lpf1_config lpf1Config = ma_lpf1_config_init(pConfig->format, pConfig->channels, pConfig->sampleRate, pConfig->cutoffFrequency);
|
||||
|
||||
if (isNew) {
|
||||
result = ma_lpf1_init(&lpf1Config, &pLPF->lpf1[ilpf1]);
|
||||
} else {
|
||||
result = ma_lpf1_reinit(&lpf1Config, &pLPF->lpf1[ilpf1]);
|
||||
}
|
||||
|
||||
if (result != MA_SUCCESS) {
|
||||
return result;
|
||||
}
|
||||
}
|
||||
|
||||
pLPF->lpf2Count = lpf2Count;
|
||||
pLPF->lpf1Count = lpf1Count;
|
||||
|
||||
return MA_SUCCESS;
|
||||
}
|
||||
|
||||
ma_result ma_lpf_init(const ma_lpf_config* pConfig, ma_lpf* pLPF)
|
||||
{
|
||||
if (pLPF == NULL) {
|
||||
return MA_INVALID_ARGS;
|
||||
}
|
||||
|
||||
MA_ZERO_OBJECT(pLPF);
|
||||
|
||||
if (pConfig == NULL) {
|
||||
return MA_INVALID_ARGS;
|
||||
}
|
||||
|
||||
return ma_lpf_reinit__internal(pConfig, pLPF, /*isNew*/MA_TRUE);
|
||||
}
|
||||
|
||||
ma_result ma_lpf_reinit(const ma_lpf_config* pConfig, ma_lpf* pLPF)
|
||||
{
|
||||
return ma_lpf_reinit__internal(pConfig, pLPF, /*isNew*/MA_FALSE);
|
||||
}
|
||||
|
||||
ma_result ma_lpf_process_pcm_frames(ma_lpf* pLPF, void* pFramesOut, const void* pFramesIn, ma_uint64 frameCount)
|
||||
{
|
||||
ma_result result;
|
||||
ma_uint32 ilpf2;
|
||||
ma_uint32 ilpf1;
|
||||
|
||||
if (pLPF == NULL) {
|
||||
return MA_INVALID_ARGS;
|
||||
}
|
||||
|
||||
/* Faster path for in-place. */
|
||||
if (pFramesOut == pFramesIn) {
|
||||
for (ilpf2 = 0; ilpf2 < pLPF->lpf2Count; ilpf2 += 1) {
|
||||
result = ma_lpf2_process_pcm_frames(&pLPF->lpf2[ilpf2], pFramesOut, pFramesOut, frameCount);
|
||||
if (result != MA_SUCCESS) {
|
||||
return result;
|
||||
}
|
||||
}
|
||||
|
||||
for (ilpf1 = 0; ilpf1 < pLPF->lpf1Count; ilpf1 += 1) {
|
||||
result = ma_lpf1_process_pcm_frames(&pLPF->lpf1[ilpf1], pFramesOut, pFramesOut, frameCount);
|
||||
if (result != MA_SUCCESS) {
|
||||
return result;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/* Slightly slower path for copying. */
|
||||
if (pFramesOut != pFramesIn) {
|
||||
ma_uint32 iFrame;
|
||||
|
||||
/* */ if (pLPF->format == ma_format_f32) {
|
||||
/* */ float* pFramesOutF32 = ( float*)pFramesOut;
|
||||
const float* pFramesInF32 = (const float*)pFramesIn;
|
||||
|
||||
for (iFrame = 0; iFrame < frameCount; iFrame += 1) {
|
||||
MA_COPY_MEMORY(pFramesOutF32, pFramesInF32, ma_get_bytes_per_frame(pLPF->format, pLPF->channels));
|
||||
|
||||
for (ilpf2 = 0; ilpf2 < pLPF->lpf2Count; ilpf2 += 1) {
|
||||
ma_lpf2_process_pcm_frame_f32(&pLPF->lpf2[ilpf2], pFramesOutF32, pFramesOutF32);
|
||||
}
|
||||
|
||||
for (ilpf1 = 0; ilpf1 < pLPF->lpf1Count; ilpf1 += 1) {
|
||||
ma_lpf1_process_pcm_frame_f32(&pLPF->lpf1[ilpf1], pFramesOutF32, pFramesOutF32);
|
||||
}
|
||||
|
||||
pFramesOutF32 += pLPF->channels;
|
||||
pFramesInF32 += pLPF->channels;
|
||||
}
|
||||
} else if (pLPF->format == ma_format_s16) {
|
||||
/* */ ma_int16* pFramesOutS16 = ( ma_int16*)pFramesOut;
|
||||
const ma_int16* pFramesInS16 = (const ma_int16*)pFramesIn;
|
||||
|
||||
for (iFrame = 0; iFrame < frameCount; iFrame += 1) {
|
||||
MA_COPY_MEMORY(pFramesOutS16, pFramesInS16, ma_get_bytes_per_frame(pLPF->format, pLPF->channels));
|
||||
|
||||
for (ilpf2 = 0; ilpf2 < pLPF->lpf2Count; ilpf2 += 1) {
|
||||
ma_lpf2_process_pcm_frame_s16(&pLPF->lpf2[ilpf2], pFramesOutS16, pFramesOutS16);
|
||||
}
|
||||
|
||||
for (ilpf1 = 0; ilpf1 < pLPF->lpf1Count; ilpf1 += 1) {
|
||||
ma_lpf1_process_pcm_frame_s16(&pLPF->lpf1[ilpf1], pFramesOutS16, pFramesOutS16);
|
||||
}
|
||||
|
||||
pFramesOutS16 += pLPF->channels;
|
||||
pFramesInS16 += pLPF->channels;
|
||||
}
|
||||
} else {
|
||||
MA_ASSERT(MA_FALSE);
|
||||
return MA_INVALID_OPERATION; /* Should never hit this. */
|
||||
}
|
||||
}
|
||||
|
||||
return MA_SUCCESS;
|
||||
}
|
||||
|
||||
ma_uint32 ma_lpf_get_latency(ma_lpf* pLPF)
|
||||
{
|
||||
if (pLPF == NULL) {
|
||||
return 0;
|
||||
}
|
||||
|
||||
return pLPF->lpf2Count*2 + pLPF->lpf1Count;
|
||||
}
|
||||
|
||||
|
||||
/**************************************************************************************************************************************************************
|
||||
|
||||
High-Pass Filtering
|
||||
|
||||
Reference in New Issue
Block a user