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audio: Enumerating audio devices will skip zombie devices still in the hash.

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(cherry picked from commit eb04219efe)
This commit is contained in:
Ryan C. Gordon
2025-06-20 17:36:51 -04:00
committed by Sam Lantinga
parent 079967afa5
commit c7325228dc
1 changed files with 12 additions and 4 deletions
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16
src/audio/SDL_audio.c
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@@ -1391,6 +1391,7 @@ static int SDLCALL RecordingAudioThread(void *devicep) // thread entry point
typedef struct CountAudioDevicesData
{
int devs_seen;
int devs_skipped;
const int num_devices;
SDL_AudioDeviceID *result;
const bool recording;
@@ -1406,7 +1407,13 @@ static bool SDLCALL CountAudioDevices(void *userdata, const SDL_HashTable *table
const bool isphysical = !!(devid & (1<<1));
if (isphysical && (devid_recording == data->recording)) {
SDL_assert(data->devs_seen < data->num_devices);
data->result[data->devs_seen++] = devid;
SDL_AudioDevice *device = (SDL_AudioDevice *) value; // this is normally risky, but we hold the device_hash_lock here.
const bool zombie = SDL_GetAtomicInt(&device->zombie) != 0;
if (zombie) {
data->devs_skipped++;
} else {
data->result[data->devs_seen++] = devid;
}
}
return true; // keep iterating.
}
@@ -1422,10 +1429,11 @@ static SDL_AudioDeviceID *GetAudioDevices(int *count, bool recording)
num_devices = SDL_GetAtomicInt(recording ? &current_audio.recording_device_count : &current_audio.playback_device_count);
result = (SDL_AudioDeviceID *) SDL_malloc((num_devices + 1) * sizeof (SDL_AudioDeviceID));
if (result) {
CountAudioDevicesData data = { 0, num_devices, result, recording };
CountAudioDevicesData data = { 0, 0, num_devices, result, recording };
SDL_IterateHashTable(current_audio.device_hash, CountAudioDevices, &data);
SDL_assert(data.devs_seen == num_devices);
result[data.devs_seen] = 0; // null-terminated.
SDL_assert((data.devs_seen + data.devs_skipped) == num_devices);
num_devices = data.devs_seen; // might be less if we skipped any.
result[num_devices] = 0; // null-terminated.
}
}
SDL_UnlockRWLock(current_audio.device_hash_lock);