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hints: Allow specifying audio device metadata.

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This is only supported on PulseAudio. You can set a description when opening
your audio device that will show up in pauvcontrol, which lets you set
per-stream volume levels.

Fixes Bugzilla #4801.
This commit is contained in:
Ryan C. Gordon
2020-05-03 22:13:48 -04:00
parent 11fef299d1
commit 8601996fbc
2 changed files with 58 additions and 8 deletions
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24
src/audio/pulseaudio/SDL_pulseaudio.c
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@@ -27,6 +27,7 @@
*/
#include "../../SDL_internal.h"
#include "SDL_assert.h"
#include "SDL_hints.h"
#if SDL_AUDIO_DRIVER_PULSEAUDIO
@@ -237,16 +238,20 @@ squashVersion(const int major, const int minor, const int patch)
static const char *
getAppName(void)
{
const char *verstr = PULSEAUDIO_pa_get_library_version();
if (verstr != NULL) {
int maj, min, patch;
if (SDL_sscanf(verstr, "%d.%d.%d", &maj, &min, &patch) == 3) {
if (squashVersion(maj, min, patch) >= squashVersion(0, 9, 15)) {
return NULL; /* 0.9.15+ handles NULL correctly. */
const char *retval = SDL_GetHint(SDL_HINT_AUDIO_DEVICE_APP_NAME);
if (!retval || !*retval) {
const char *verstr = PULSEAUDIO_pa_get_library_version();
retval = "SDL Application"; /* the "oh well" default. */
if (verstr != NULL) {
int maj, min, patch;
if (SDL_sscanf(verstr, "%d.%d.%d", &maj, &min, &patch) == 3) {
if (squashVersion(maj, min, patch) >= squashVersion(0, 9, 15)) {
retval = NULL; /* 0.9.15+ handles NULL correctly. */
}
}
}
}
return "SDL Application"; /* oh well. */
return retval;
}
static void
@@ -513,6 +518,7 @@ PULSEAUDIO_OpenDevice(_THIS, void *handle, const char *devname, int iscapture)
pa_buffer_attr paattr;
pa_channel_map pacmap;
pa_stream_flags_t flags = 0;
const char *name = NULL;
int state = 0;
int rc = 0;
@@ -615,9 +621,11 @@ PULSEAUDIO_OpenDevice(_THIS, void *handle, const char *devname, int iscapture)
PULSEAUDIO_pa_channel_map_init_auto(&pacmap, this->spec.channels,
PA_CHANNEL_MAP_WAVEEX);
name = SDL_GetHint(SDL_HINT_AUDIO_DEVICE_STREAM_NAME);
h->stream = PULSEAUDIO_pa_stream_new(
h->context,
"Simple DirectMedia Layer", /* stream description */
(name && *name) ? name : "Audio Stream", /* stream description */
&paspec, /* sample format spec */
&pacmap /* channel map */
);