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pulseaudio: Optionally add "monitor" sources to device list.

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There's a new hint to enable this.

Fixes #2917.
This commit is contained in:
Ryan C. Gordon 2021-07-27 13:12:57 -04:00
parent 8d790b10f8
commit 736a424ff4
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GPG key ID: FA148B892AB48044
2 changed files with 27 additions and 2 deletions
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19
include/SDL_hints.h
View file

@ -1675,6 +1675,25 @@ extern "C" {
*/
#define SDL_HINT_XINPUT_USE_OLD_JOYSTICK_MAPPING "SDL_XINPUT_USE_OLD_JOYSTICK_MAPPING"
/**
* \brief A variable that causes SDL to not ignore audio "monitors"
*
* This is currently only used for PulseAudio and ignored elsewhere.
*
* By default, SDL ignores audio devices that aren't associated with physical
* hardware. Changing this hint to "1" will expose anything SDL sees that
* appears to be an audio source or sink. This will add "devices" to the list
* that the user probably doesn't want or need, but it can be useful in
* scenarios where you want to hook up SDL to some sort of virtual device,
* etc.
*
* The default value is "0". This hint must be set before SDL_Init().
*
* This hint is available since SDL 2.0.16. Before then, virtual devices are
* always ignored.
*/
#define SDL_HINT_AUDIO_INCLUDE_MONITORS "SDL_AUDIO_INCLUDE_MONITORS"
/**
* \brief An enumeration of hint priorities

10
src/audio/pulseaudio/SDL_pulseaudio.c
View file

@ -46,6 +46,10 @@
#include "SDL_loadso.h"
#include "../../thread/SDL_systhread.h"
/* should we include monitors in the device list? Set at SDL_Init time */
static SDL_bool include_monitors = SDL_FALSE;
#if (PA_API_VERSION < 12)
/** Return non-zero if the passed state is one of the connected states */
static SDL_INLINE int PA_CONTEXT_IS_GOOD(pa_context_state_t x) {
@ -744,8 +748,8 @@ SourceInfoCallback(pa_context *c, const pa_source_info *i, int is_last, void *da
{
SDL_AudioSpec spec;
if (i) {
/* Skip "monitor" sources. These are just output from other sinks. */
if (i->monitor_of_sink == PA_INVALID_INDEX) {
/* Maybe skip "monitor" sources. These are just output from other sinks. */
if (include_monitors || (i->monitor_of_sink == PA_INVALID_INDEX)) {
spec.freq = i->sample_spec.rate;
spec.channels = i->sample_spec.channels;
spec.format = PulseFormatToSDLFormat(i->sample_spec.format);
@ -834,6 +838,8 @@ PULSEAUDIO_Init(SDL_AudioDriverImpl * impl)
return 0;
}
include_monitors = SDL_GetHintBoolean(SDL_HINT_AUDIO_INCLUDE_MONITORS, SDL_FALSE);
/* Set the function pointers */
impl->DetectDevices = PULSEAUDIO_DetectDevices;
impl->OpenDevice = PULSEAUDIO_OpenDevice;