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audio(4): Prime the playback buffer when starting the device.

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This commit is contained in:
David Reid
2026-01-14 10:11:48 +10:00
parent 26ce86a4cf
commit 1438d96b38
1 changed files with 36 additions and 0 deletions
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miniaudio.h
+36
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@@ -38629,6 +38629,40 @@ static void ma_device_uninit__audio4(ma_device* pDevice)
ma_free(pDeviceStateAudio4, ma_device_get_allocation_callbacks(pDevice));
}
static void ma_device_prime_playback_buffer__audio4(ma_device* pDevice)
{
ma_device_state_audio4* pDeviceStateAudio4 = ma_device_get_backend_state__audio4(pDevice);
ma_device_type deviceType = ma_device_get_type(pDevice);
ma_uint8 buffer[4096];
ma_uint32 bpf;
ma_uint32 framesToWrite;
ma_uint32 framesWritten;
if (deviceType == ma_device_type_playback || deviceType == ma_device_type_duplex) {
bpf = ma_get_bytes_per_frame(pDevice->playback.internalFormat, pDevice->playback.internalChannels);
framesToWrite = pDevice->playback.internalPeriodSizeInFrames * pDevice->playback.internalPeriods;
framesWritten = 0;
MA_ZERO_MEMORY(buffer, sizeof(buffer));
while (framesWritten < framesToWrite) {
ma_uint32 framesToWriteThisIteration = sizeof(buffer) / bpf;
ma_uint32 framesRemaining = framesToWrite - framesWritten;
if (framesToWriteThisIteration > framesRemaining) {
framesToWriteThisIteration = framesRemaining;
}
/* Just a guard to ensure we don't get stuck in a loop. Should never happen in practice (would require a massive channel count). */
if (framesToWriteThisIteration == 0) {
break;
}
write(pDeviceStateAudio4->fdPlayback, buffer, framesToWriteThisIteration);
framesWritten += framesToWriteThisIteration;
}
}
}
static ma_result ma_device_start__audio4(ma_device* pDevice)
{
ma_device_state_audio4* pDeviceStateAudio4 = ma_device_get_backend_state__audio4(pDevice);
@@ -38644,6 +38678,8 @@ static ma_result ma_device_start__audio4(ma_device* pDevice)
if (pDeviceStateAudio4->fdPlayback == -1) {
return MA_INVALID_ARGS;
}
ma_device_prime_playback_buffer__audio4(pDevice);
}
return MA_SUCCESS;