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Fix a pitching bug with the engine.

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This is happening when the engine's sample rate differs from the data
source's sample rate.
This commit is contained in:
David Reid
2021-04-05 12:37:22 +10:00
parent 2a31247b50
commit 8a1c72f2c3
1 changed files with 15 additions and 11 deletions
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research/miniaudio_engine.h
+7 -3
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@@ -1648,6 +1648,7 @@ typedef struct
{
ma_node_base baseNode; /* Must be the first member for compatiblity with the ma_node API. */
ma_engine* pEngine; /* A pointer to the engine. Set based on the value from the config. */
ma_uint32 sampleRate; /* The sample rate of the input data. For sounds backed by a data source, this will be the data source's sample rate. Otherwise it'll be the engine's sample rate. */
ma_fader fader;
ma_resampler resampler; /* For pitch shift. May change this to ma_linear_resampler later. */
ma_spatializer spatializer;
@@ -9941,10 +9942,11 @@ MA_API ma_engine_node_config ma_engine_node_config_init(ma_engine* pEngine, ma_e
static void ma_engine_node_update_pitch_if_required(ma_engine_node* pEngineNode)
{
ma_bool32 isUpdateRequired = MA_FALSE;
float newPitch;
MA_ASSERT(pEngineNode != NULL);
float newPitch = c89atomic_load_explicit_f32(&pEngineNode->pitch, c89atomic_memory_order_acquire);
newPitch = c89atomic_load_explicit_f32(&pEngineNode->pitch, c89atomic_memory_order_acquire);
if (pEngineNode->oldPitch != newPitch) {
pEngineNode->oldPitch = newPitch;
@@ -9957,7 +9959,8 @@ static void ma_engine_node_update_pitch_if_required(ma_engine_node* pEngineNode)
}
if (isUpdateRequired) {
ma_resampler_set_rate_ratio(&pEngineNode->resampler, pEngineNode->oldPitch * pEngineNode->oldDopplerPitch);
float basePitch = (float)pEngineNode->sampleRate / ma_engine_get_sample_rate(pEngineNode->pEngine);
ma_resampler_set_rate_ratio(&pEngineNode->resampler, basePitch * pEngineNode->oldPitch * pEngineNode->oldDopplerPitch);
}
}
@@ -10357,6 +10360,7 @@ MA_API ma_result ma_engine_node_init(const ma_engine_node_config* pConfig, const
}
pEngineNode->pEngine = pConfig->pEngine;
pEngineNode->sampleRate = (pConfig->sampleRate > 0) ? pConfig->sampleRate : ma_engine_get_sample_rate(pEngineNode->pEngine);
pEngineNode->pitch = 1;
pEngineNode->oldPitch = 1;
pEngineNode->oldDopplerPitch = 1;
@@ -10373,7 +10377,7 @@ MA_API ma_result ma_engine_node_init(const ma_engine_node_config* pConfig, const
*/
/* We'll always do resampling first. */
resamplerConfig = ma_resampler_config_init(ma_format_f32, baseNodeConfig.inputChannels[0], (pConfig->sampleRate > 0) ? pConfig->sampleRate : ma_engine_get_sample_rate(pEngineNode->pEngine), ma_engine_get_sample_rate(pEngineNode->pEngine), ma_resample_algorithm_linear);
resamplerConfig = ma_resampler_config_init(ma_format_f32, baseNodeConfig.inputChannels[0], pEngineNode->sampleRate, ma_engine_get_sample_rate(pEngineNode->pEngine), ma_resample_algorithm_linear);
resamplerConfig.linear.lpfOrder = 0; /* <-- Need to disable low-pass filtering for pitch shifting for now because there's cases where the biquads are becoming unstable. Need to figure out a better fix for this. */
result = ma_resampler_init(&resamplerConfig, &pEngineNode->resampler);