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ALSA: Address an issue where it was possible for some samples to get dropped when a capture device is closed.

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This commit is contained in:
David Reid
2016-10-17 19:23:08 +10:00
parent cc98c7efff
commit 98046e0a4f
1 changed files with 10 additions and 8 deletions
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mini_al.h
+10 -8
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@@ -1615,9 +1615,12 @@ static mal_result mal_device__main_loop__dsound(mal_device* pDevice)
// Waits for a number of frames to become available for either capture or playback. The return
// value is the number of frames available. If this is less than the fragment size it means the
// main loop has been terminated from another thread. The return value will be clamped to the
// fragment size.
// fragment size if the main loop is still running, but could be larger if it returns due to the
// main loop being terminated.
//
// This will return early if the main loop is broken with mal_device__break_main_loop().
// This will return early if the main loop is broken with mal_device__break_main_loop(), in
// which case it is possible for the returned number of frames will be greater than the size of
// a fragment (but smaller than the total buffer size).
mal_uint32 mal_device__wait_for_frames__alsa(mal_device* pDevice)
{
mal_assert(pDevice != NULL);
@@ -1655,9 +1658,8 @@ mal_uint32 mal_device__wait_for_frames__alsa(mal_device* pDevice)
return 0;
}
// There's a small chance we'll have more frames available than the size of a fragment. These frames
// will be lost to cyberspace :(
return (framesAvailable < pDevice->fragmentSizeInFrames) ? framesAvailable : pDevice->fragmentSizeInFrames;
// There's a small chance we'll have more frames available than the size of a fragment.
return framesAvailable;
}
mal_bool32 mal_device_write__alsa(mal_device* pDevice)
@@ -2027,7 +2029,7 @@ mal_result mal_device_init__alsa(mal_device* pDevice, mal_device_type type, mal_
// If we're _not_ using mmap we need to use an intermediary buffer.
if (!pDevice->alsa.isUsingMMap) {
pDevice->alsa.pIntermediaryBuffer = mal_malloc(pDevice->fragmentSizeInFrames * pDevice->channels * mal_get_sample_size_in_bytes(pDevice->format));
pDevice->alsa.pIntermediaryBuffer = mal_malloc(pDevice->fragmentSizeInFrames*pDevice->fragmentCount * pDevice->channels * mal_get_sample_size_in_bytes(pDevice->format));
if (pDevice->alsa.pIntermediaryBuffer == NULL) {
mal_device_uninit__alsa(pDevice);
return mal_post_error(pDevice, "[ALSA] Failed to set software parameters. snd_pcm_sw_params() failed.", MAL_OUT_OF_MEMORY);
@@ -2511,10 +2513,10 @@ mal_uint32 mal_get_sample_size_in_bytes(mal_format format)
// ====
// - Support rewinding. This will enable applications to employ better anti-latency.
// - Implement the null device.
// - Pass the log callback to mal_device_init().
// - Consider having some core formats which are guaranteed to work. Perhaps u8, s16 and
// f32 to cover the 8-, 16 and 32-bit ranges.
// - The rationale for this is to make it easier for
// - The rationale for this is to make it easier for applications to get audio working
// without any fuss.
//
//
// ALSA