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audio fastpath: reduce filter delay

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- reduced filter strength, which also reduces delays
- increased I2S buffer count, and reduced I2S cycle time to recover from delays faster.
This commit is contained in:
Frank
2023-04-30 20:58:06 +02:00
parent ac5aed8e36
commit 0c58c12d0f
2 changed files with 18 additions and 0 deletions
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13
usermods/audioreactive/audio_reactive.h
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@@ -254,7 +254,11 @@ constexpr SRate_t SAMPLE_RATE = 22050; // Base sample rate in Hz - 22Khz
//constexpr SRate_t SAMPLE_RATE = 16000; // 16kHz - use if FFTtask takes more than 20ms. Physical sample time -> 32ms
//constexpr SRate_t SAMPLE_RATE = 20480; // Base sample rate in Hz - 20Khz is experimental. Physical sample time -> 25ms
//constexpr SRate_t SAMPLE_RATE = 10240; // Base sample rate in Hz - previous default. Physical sample time -> 50ms
#ifdef WLEDMM_FASTPATH
#define FFT_MIN_CYCLE 21 // minimum time before FFT task is repeated. Use with 22Khz sampling
#else
#define FFT_MIN_CYCLE 15 // reduce min time, to allow faster catch-up when I2S is lagging
#endif
//#define FFT_MIN_CYCLE 30 // Use with 16Khz sampling
//#define FFT_MIN_CYCLE 23 // minimum time before FFT task is repeated. Use with 20Khz sampling
//#define FFT_MIN_CYCLE 46 // minimum time before FFT task is repeated. Use with 10Khz sampling
@@ -1129,8 +1133,13 @@ class AudioReactive : public Usermod {
{
float sampleAdj; // Gain adjusted sample value
float tmpSample; // An interim sample variable used for calculatioins.
#ifdef WLEDMM_FASTPATH
constexpr float weighting = 0.35f; // slightly reduced filter strength, to reduce audio latency
constexpr float weighting2 = 0.25f;
#else
const float weighting = 0.2f; // Exponential filter weighting. Will be adjustable in a future release.
const float weighting2 = 0.073f; // Exponential filter weighting, for rising signal (a bit more robust against spikes)
#endif
const int AGC_preset = (soundAgc > 0)? (soundAgc-1): 0; // make sure the _compiler_ knows this value will not change while we are inside the function
static bool isFrozen = false;
static bool haveSilence = true;
@@ -1732,7 +1741,11 @@ class AudioReactive : public Usermod {
// get AGC sensitivity and sound pressure
static unsigned long lastEstimate = 0;
#ifdef WLEDMM_FASTPATH
if (millis() - lastEstimate > 7) {
#else
if (millis() - lastEstimate > 12) {
#endif
lastEstimate = millis();
agcSensitivity = getSensitivity();
if (limiterOn)

5
usermods/audioreactive/audio_source.h
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@@ -180,8 +180,13 @@ class I2SSource : public AudioSource {
#if ESP_IDF_VERSION >= ESP_IDF_VERSION_VAL(4, 2, 0)
.communication_format = i2s_comm_format_t(I2S_COMM_FORMAT_STAND_I2S),
//.intr_alloc_flags = ESP_INTR_FLAG_LEVEL1,
#ifdef WLEDMM_FASTPATH
.intr_alloc_flags = ESP_INTR_FLAG_LEVEL2|ESP_INTR_FLAG_LEVEL3, // seems to reduce noise
.dma_buf_count = 28, // 160ms buffer (128 * dma_buf_count / sampleRate)
#else
.intr_alloc_flags = ESP_INTR_FLAG_LEVEL2,
.dma_buf_count = 8,
#endif
.dma_buf_len = _blockSize,
.use_apll = 0,
//.fixed_mclk = 0,