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Experimental improvements for the ALSA backend.

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This commit is contained in:
David Reid
2019-08-26 19:51:39 +10:00
parent 14507ba617
commit bfb19f2938
2 changed files with 14 additions and 17 deletions
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miniaudio.h
+5 -14
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@@ -13538,20 +13538,11 @@ ma_result ma_device_init_by_type__alsa(ma_context* pContext, const ma_device_con
return ma_post_error(pDevice, MA_LOG_LEVEL_ERROR, "[ALSA] Failed to initialize software parameters. snd_pcm_sw_params_current() failed.", MA_FAILED_TO_CONFIGURE_BACKEND_DEVICE);
}
if (deviceType == ma_device_type_capture) {
if (((ma_snd_pcm_sw_params_set_avail_min_proc)pContext->alsa.snd_pcm_sw_params_set_avail_min)(pPCM, pSWParams, 1) != 0) {
ma_free(pSWParams);
((ma_snd_pcm_close_proc)pDevice->pContext->alsa.snd_pcm_close)(pPCM);
return ma_post_error(pDevice, MA_LOG_LEVEL_ERROR, "[ALSA] snd_pcm_sw_params_set_avail_min() failed.", MA_FORMAT_NOT_SUPPORTED);
}
} else {
if (((ma_snd_pcm_sw_params_set_avail_min_proc)pContext->alsa.snd_pcm_sw_params_set_avail_min)(pPCM, pSWParams, 1) != 0) {
ma_free(pSWParams);
((ma_snd_pcm_close_proc)pDevice->pContext->alsa.snd_pcm_close)(pPCM);
return ma_post_error(pDevice, MA_LOG_LEVEL_ERROR, "[ALSA] snd_pcm_sw_params_set_avail_min() failed.", MA_FORMAT_NOT_SUPPORTED);
}
if (((ma_snd_pcm_sw_params_set_avail_min_proc)pContext->alsa.snd_pcm_sw_params_set_avail_min)(pPCM, pSWParams, ma_prev_power_of_2(internalBufferSizeInFrames/internalPeriods)) != 0) {
ma_free(pSWParams);
((ma_snd_pcm_close_proc)pDevice->pContext->alsa.snd_pcm_close)(pPCM);
return ma_post_error(pDevice, MA_LOG_LEVEL_ERROR, "[ALSA] snd_pcm_sw_params_set_avail_min() failed.", MA_FORMAT_NOT_SUPPORTED);
}
if (((ma_snd_pcm_sw_params_get_boundary_proc)pContext->alsa.snd_pcm_sw_params_get_boundary)(pSWParams, &bufferBoundary) < 0) {
bufferBoundary = internalBufferSizeInFrames;
@@ -13564,7 +13555,7 @@ ma_result ma_device_init_by_type__alsa(ma_context* pContext, const ma_device_con
Subtle detail here with the start threshold. When in playback-only mode (no full-duplex) we can set the start threshold to
the size of a period. But for full-duplex we need to set it such that it is at least two periods.
*/
if (((ma_snd_pcm_sw_params_set_start_threshold_proc)pContext->alsa.snd_pcm_sw_params_set_start_threshold)(pPCM, pSWParams, internalBufferSizeInFrames) != 0) {
if (((ma_snd_pcm_sw_params_set_start_threshold_proc)pContext->alsa.snd_pcm_sw_params_set_start_threshold)(pPCM, pSWParams, (internalBufferSizeInFrames/internalPeriods)*2) != 0) {
ma_free(pSWParams);
((ma_snd_pcm_close_proc)pDevice->pContext->alsa.snd_pcm_close)(pPCM);
return ma_post_error(pDevice, MA_LOG_LEVEL_ERROR, "[ALSA] Failed to set start threshold for playback device. snd_pcm_sw_params_set_start_threshold() failed.", MA_FAILED_TO_CONFIGURE_BACKEND_DEVICE);