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audio: Don't reset device ID counter on subsystem init/quit. 

Otherwise you risk a buggy app holding an obsolete device ID that now refers
to a different device after reinit.
main
Ryan C. Gordon 2023-10-31 10:50:37 -04:00
parent 5d95cbde37
commit 24e3328cca
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GPG Key ID: FA148B892AB48044
2 changed files with 5 additions and 5 deletions
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9
src/audio/SDL_audio.c
View File

@ -275,16 +275,16 @@ static void ClosePhysicalAudioDevice(SDL_AudioDevice *device);
SDL_COMPILE_TIME_ASSERT(check_lowest_audio_default_value, SDL_AUDIO_DEVICE_DEFAULT_CAPTURE < SDL_AUDIO_DEVICE_DEFAULT_OUTPUT);
static SDL_AtomicInt last_device_instance_id; // increments on each device add to provide unique instance IDs
static SDL_AudioDeviceID AssignAudioDeviceInstanceId(SDL_bool iscapture, SDL_bool islogical)
{
/* Assign an instance id! Start at 2, in case there are things from the SDL2 era that still think 1 is a special value.
There's no reasonable scenario where this rolls over, but just in case, we wrap it in a loop.
Also, make sure we don't assign SDL_AUDIO_DEVICE_DEFAULT_OUTPUT, etc. */
// The bottom two bits of the instance id tells you if it's an output device (1<<0), and if it's a physical device (1<<1).
const SDL_AudioDeviceID flags = (iscapture ? 0 : (1<<0)) | (islogical ? 0 : (1<<1));
const SDL_AudioDeviceID instance_id = (((SDL_AudioDeviceID) (SDL_AtomicIncRef(&current_audio.last_device_instance_id) + 1)) << 2) | flags;
const SDL_AudioDeviceID instance_id = (((SDL_AudioDeviceID) (SDL_AtomicIncRef(&last_device_instance_id) + 1)) << 2) | flags;
SDL_assert( (instance_id >= 2) && (instance_id < SDL_AUDIO_DEVICE_DEFAULT_CAPTURE) );
return instance_id;
}
@ -669,6 +669,9 @@ int SDL_InitAudio(const char *driver_name)
SDL_QuitAudio(); // shutdown driver if already running.
}
// make sure device IDs start at 2 (because of SDL2 legacy interface), but don't reset the counter on each init, in case the app is holding an old device ID somewhere.
SDL_AtomicCAS(&last_device_instance_id, 0, 2);
SDL_ChooseAudioConverters();
SDL_SetupAudioResampler();
@ -719,7 +722,6 @@ int SDL_InitAudio(const char *driver_name)
tried_to_init = SDL_TRUE;
SDL_zero(current_audio);
current_audio.pending_events_tail = &current_audio.pending_events;
SDL_AtomicSet(&current_audio.last_device_instance_id, 2); // start past 1 because of SDL2's legacy interface.
current_audio.device_hash_lock = device_hash_lock;
current_audio.device_hash = device_hash;
if (bootstrap[i]->init(&current_audio.impl)) {
@ -744,7 +746,6 @@ int SDL_InitAudio(const char *driver_name)
tried_to_init = SDL_TRUE;
SDL_zero(current_audio);
current_audio.pending_events_tail = &current_audio.pending_events;
SDL_AtomicSet(&current_audio.last_device_instance_id, 2); // start past 1 because of SDL2's legacy interface.
current_audio.device_hash_lock = device_hash_lock;
current_audio.device_hash = device_hash;
if (bootstrap[i]->init(&current_audio.impl)) {

1
src/audio/SDL_sysaudio.h
View File

@ -175,7 +175,6 @@ typedef struct SDL_AudioDriver
// !!! FIXME: most (all?) of these don't have to be atomic.
SDL_AtomicInt output_device_count;
SDL_AtomicInt capture_device_count;
SDL_AtomicInt last_device_instance_id; // increments on each device add to provide unique instance IDs
SDL_AtomicInt shutting_down; // non-zero during SDL_Quit, so we known not to accept any last-minute device hotplugs.
} SDL_AudioDriver;