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Add stream preference to request a persistent stream session and implement this in WASAPI.

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This commit is contained in:
Admiral H. Curtiss 2020-07-29 21:29:09 +02:00 committed by Paul Adenot
parent 8d596fee96
commit dce06b123d
2 changed files with 13 additions and 3 deletions
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6
include/cubeb/cubeb.h
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@ -236,8 +236,12 @@ typedef enum {
selected, as well as the quality of the stream,
for example to accomodate bluetooth SCO modes on
bluetooth devices. */
CUBEB_STREAM_PREF_RAW = 0x08 /**< Windows only. Bypass all signal processing
CUBEB_STREAM_PREF_RAW = 0x08, /**< Windows only. Bypass all signal processing
except for always on APO, driver and hardware. */
CUBEB_STREAM_PREF_PERSIST = 0x10, /**< Request that the volume and mute settings
should persist across restarts of the stream
and/or application. May not be honored for
all backends and platforms. */
} cubeb_stream_prefs;
/** Stream format initialization parameters. */

10
src/cubeb_wasapi.cpp
View file

@ -1857,7 +1857,7 @@ initialize_iaudioclient3(com_ptr<IAudioClient> & audio_client,
// IAudioClient3 doesn't support AUDCLNT_STREAMFLAGS_NOPERSIST, and will return
// AUDCLNT_E_INVALID_STREAM_FLAG. This is undocumented.
flags = flags ^ AUDCLNT_STREAMFLAGS_NOPERSIST;
flags = flags & ~AUDCLNT_STREAMFLAGS_NOPERSIST;
// Some people have reported glitches with capture streams:
// http://blog.nirbheek.in/2018/03/low-latency-audio-on-windows-with.html
@ -2054,7 +2054,13 @@ int setup_wasapi_stream_one_side(cubeb_stream * stm,
mix_params->format, mix_params->rate, mix_params->channels,
mix_params->layout);
DWORD flags = AUDCLNT_STREAMFLAGS_NOPERSIST;
DWORD flags = 0;
bool is_persist = stream_params->prefs & CUBEB_STREAM_PREF_PERSIST;
if (!is_persist) {
flags |= AUDCLNT_STREAMFLAGS_NOPERSIST;
}
// Check if a loopback device should be requested. Note that event callbacks
// do not work with loopback devices, so only request these if not looping.