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revised WMME default latency on XP, Vista, Win7 to 90ms. Resolves ticket #80. Could go lower if we had more results from ticket #185

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rossb 2011-08-18 05:58:56 +00:00
commit 8f6b491bae
1 changed files with 15 additions and 4 deletions
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19
src/hostapi/wmme/pa_win_wmme.c
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@ -174,16 +174,27 @@
/* Use higher latency for NT because it is even worse at real-time
operation than Win9x.
*/
#define PA_MME_WIN_NT_DEFAULT_LATENCY_ (PA_MME_WIN_9X_DEFAULT_LATENCY_ * 2)
#define PA_MME_WIN_WDM_DEFAULT_LATENCY_ (PA_MME_WIN_9X_DEFAULT_LATENCY_)
#define PA_MME_WIN_NT_DEFAULT_LATENCY_ (0.4)
/* Default low latency for WDM based systems. This is based on a rough
survey of workable latency settings using patest_wmme_find_best_latency_params.c.
See pdf attached to ticket 185 for a graph of the survey results:
http://www.portaudio.com/trac/ticket/185
Workable latencies varied between 40ms and ~80ms on different systems (different
combinations of hardware, 32 and 64 bit, WinXP, Vista and Win7. We didn't
get enough Vista results to know if Vista has systemically worse latency.
For now we choose a safe value across all Windows versions here.
*/
#define PA_MME_WIN_WDM_DEFAULT_LATENCY_ (0.090)
/* When client suggestedLatency could result in many host buffers, we aim to have around 8,
based off Windows documentation that suggests that the kmixer uses 8 buffers. This choice
is somewhat arbitrary here, since we havn't observed significant stability degredation
with using either more, or less buffers.
*/
#define PA_MME_TARGET_HOST_BUFFER_COUNT_ 8
#define PA_MME_TARGET_HOST_BUFFER_COUNT_ 8
#define PA_MME_MIN_TIMEOUT_MSEC_ (1000)