Android: make Detect devices common between aaudio and android driver. (#6828)

remove VLA, dynamic alloc, check max length get using GetIntArrayRegion

src/audio/aaudio/SDL_aaudio.c

@@ -70,45 +70,6 @@ void aaudio_errorCallback(AAudioStream *stream, void *userData, aaudio_result_t
 
 #define LIB_AAUDIO_SO "libaaudio.so"
 
-static void aaudio_DetectDevices(void)
-{
-    int *inputs;
-    inputs = SDL_malloc(sizeof(int) * 100);
-    SDL_zerop(inputs);
-    int inputs_length = 0;
-
-    Android_JNI_GetAudioInputDevices(inputs, &inputs_length);
-
-    for (int i = 0; i < inputs_length; ++i) {
-        int device_id = inputs[i];
-        int n = (int) (log10(device_id) + 1);
-        char device_name[n];
-        SDL_itoa(device_id, device_name, 10);
-        SDL_Log("Adding input device with name %s", device_name);
-        SDL_AddAudioDevice(SDL_FALSE, SDL_strdup(device_name), NULL, (void *) ((size_t) device_id + 1));
-    }
-
-    SDL_free(inputs);
-
-    int *outputs;
-    outputs = SDL_malloc(sizeof(int) * 100);
-    SDL_zerop(outputs);
-    int outputs_length = 0;
-
-    Android_JNI_GetAudioOutputDevices(outputs, &outputs_length);
-
-    for (int i = 0; i < outputs_length; ++i) {
-        int device_id = outputs[i];
-        int n = (int) (log10(device_id) + 1);
-        char device_name[n];
-        SDL_itoa(device_id, device_name, 10);
-        SDL_Log("Adding output device with name %s", device_name);
-        SDL_AddAudioDevice(SDL_TRUE, SDL_strdup(device_name), NULL, (void *) ((size_t) device_id + 1));
-    }
-
-    SDL_free(outputs);
-}
-
 static int aaudio_OpenDevice(_THIS, const char *devname)
 {
     struct SDL_PrivateAudioData *private;
@@ -344,7 +305,7 @@ static SDL_bool aaudio_Init(SDL_AudioDriverImpl *impl)
         goto failure;
     }
 
-    impl->DetectDevices = aaudio_DetectDevices;
+    impl->DetectDevices = Android_DetectDevices;
     impl->Deinitialize = aaudio_Deinitialize;
     impl->OpenDevice = aaudio_OpenDevice;
     impl->CloseDevice = aaudio_CloseDevice;

src/audio/android/SDL_androidaudio.c

@@ -35,43 +35,6 @@
 static SDL_AudioDevice *audioDevice = NULL;
 static SDL_AudioDevice *captureDevice = NULL;
 
-static void ANDROIDAUDIO_DetectDevices(void) {
-    int *inputs;
-    inputs = SDL_malloc(sizeof(int) * 100);
-    SDL_zerop(inputs);
-    int inputs_length = 0;
-
-    Android_JNI_GetAudioInputDevices(inputs, &inputs_length);
-
-    for (int i = 0; i < inputs_length; ++i) {
-        int device_id = inputs[i];
-        int n = (int) (log10(device_id) + 1);
-        char device_name[n];
-        SDL_itoa(device_id, device_name, 10);
-        SDL_Log("Adding input device with name %s", device_name);
-        SDL_AddAudioDevice(SDL_FALSE, SDL_strdup(device_name), NULL, (void *) ((size_t) device_id + 1));
-    }
-
-    SDL_free(inputs);
-
-    int *outputs;
-    outputs = SDL_malloc(sizeof(int) * 100);
-    SDL_zerop(outputs);
-    int outputs_length = 0;
-
-    Android_JNI_GetAudioOutputDevices(outputs, &outputs_length);
-
-    for (int i = 0; i < outputs_length; ++i) {
-        int device_id = outputs[i];
-        int n = (int) (log10(device_id) + 1);
-        char device_name[n];
-        SDL_itoa(device_id, device_name, 10);
-        SDL_Log("Adding output device with name %s", device_name);
-        SDL_AddAudioDevice(SDL_TRUE, SDL_strdup(device_name), NULL, (void *) ((size_t) device_id + 1));
-    }
-
-    SDL_free(outputs);
-}
 
 static int ANDROIDAUDIO_OpenDevice(_THIS, const char *devname)
 {
@@ -101,20 +64,20 @@ static int ANDROIDAUDIO_OpenDevice(_THIS, const char *devname)
         }
     }
 
-    int audio_device_id = 0;
-
-    if(devname != NULL) {
-        audio_device_id = SDL_atoi(devname);
-    }
-
     if (!test_format) {
         /* Didn't find a compatible format :( */
         return SDL_SetError("%s: Unsupported audio format", "android");
     }
 
+    {
+        int audio_device_id = 0;
+        if (devname != NULL) {
+            audio_device_id = SDL_atoi(devname);
+        }
         if (Android_JNI_OpenAudioDevice(iscapture, audio_device_id, &this->spec) < 0) {
             return -1;
         }
+    }
 
     SDL_CalculateAudioSpec(&this->spec);
 
@@ -160,7 +123,7 @@ static void ANDROIDAUDIO_CloseDevice(_THIS)
 static SDL_bool ANDROIDAUDIO_Init(SDL_AudioDriverImpl *impl)
 {
     /* Set the function pointers */
-    impl->DetectDevices = ANDROIDAUDIO_DetectDevices;
+    impl->DetectDevices = Android_DetectDevices;
     impl->OpenDevice = ANDROIDAUDIO_OpenDevice;
     impl->PlayDevice = ANDROIDAUDIO_PlayDevice;
     impl->GetDeviceBuf = ANDROIDAUDIO_GetDeviceBuf;

src/core/android/SDL_android.c

@@ -938,17 +938,18 @@ extern void SDL_RemoveAudioDevice(const SDL_bool iscapture, void *handle);
 
 JNIEXPORT void JNICALL
 SDL_JAVA_AUDIO_INTERFACE(addAudioDevice)(JNIEnv *env, jclass jcls, jboolean is_capture,
-                                         jint device_id) {
+                                         jint device_id)
-    int n = (int) (log10(device_id) + 1);
+{
-    char device_name[n];
+    char device_name[64];
-    SDL_itoa(device_id, device_name, 10);
+    SDL_snprintf(device_name, sizeof (device_name), "%d", device_id);
     SDL_Log("Adding device with name %s, capture %d", device_name, is_capture);
     SDL_AddAudioDevice(is_capture, SDL_strdup(device_name), NULL, (void *) ((size_t) device_id + 1));
 }
 
 JNIEXPORT void JNICALL
 SDL_JAVA_AUDIO_INTERFACE(removeAudioDevice)(JNIEnv *env, jclass jcls, jboolean is_capture,
-                                            jint device_id) {
+                                            jint device_id)
+{
     SDL_Log("Removing device with handle %d, capture %d", device_id + 1, is_capture);
     SDL_RemoveAudioDevice(is_capture, (void *) ((size_t) device_id + 1));
 }
@@ -1471,26 +1472,54 @@ static void *audioBufferPinned = NULL;
 static int captureBufferFormat = 0;
 static jobject captureBuffer = NULL;
 
-void Android_JNI_GetAudioOutputDevices(int *devices, int *length) {
+static void Android_JNI_GetAudioDevices(int *devices, int *length, int max_len, int is_input)
+{
     JNIEnv *env = Android_JNI_GetEnv();
     jintArray result;
 
+    if (is_input) {
+        result = (*env)->CallStaticObjectMethod(env, mAudioManagerClass, midGetAudioInputDevices);
+    } else {
         result = (*env)->CallStaticObjectMethod(env, mAudioManagerClass, midGetAudioOutputDevices);
+    }
 
     *length = (*env)->GetArrayLength(env, result);
 
+    *length = SDL_min(*length, max_len);
+
     (*env)->GetIntArrayRegion(env, result, 0, *length, devices);
 }
 
-void Android_JNI_GetAudioInputDevices(int * devices, int *length) {
+void Android_DetectDevices(void)
-    JNIEnv *env = Android_JNI_GetEnv();
+{
-    jintArray result;
+    int inputs[100];
+    int outputs[100];
+    int inputs_length = 0;
+    int outputs_length = 0;
 
-    result = (*env)->CallStaticObjectMethod(env, mAudioManagerClass, midGetAudioInputDevices);
+    SDL_zeroa(inputs);
 
-    *length = (*env)->GetArrayLength(env, result);
+    Android_JNI_GetAudioDevices(inputs, &inputs_length, 100, 1 /* input devices */);
 
-    (*env)->GetIntArrayRegion(env, result, 0, *length, devices);
+    for (int i = 0; i < inputs_length; ++i) {
+        int device_id = inputs[i];
+        char device_name[64];
+        SDL_snprintf(device_name, sizeof (device_name), "%d", device_id);
+        SDL_Log("Adding input device with name %s", device_name);
+        SDL_AddAudioDevice(SDL_FALSE, SDL_strdup(device_name), NULL, (void *) ((size_t) device_id + 1));
+    }
+
+    SDL_zeroa(outputs);
+
+    Android_JNI_GetAudioDevices(outputs, &outputs_length, 100, 0 /* output devices */);
+
+    for (int i = 0; i < outputs_length; ++i) {
+        int device_id = outputs[i];
+        char device_name[64];
+        SDL_snprintf(device_name, sizeof (device_name), "%d", device_id);
+        SDL_Log("Adding output device with name %s", device_name);
+        SDL_AddAudioDevice(SDL_TRUE, SDL_strdup(device_name), NULL, (void *) ((size_t) device_id + 1));
+    }
 }
 
 int Android_JNI_OpenAudioDevice(int iscapture, int device_id, SDL_AudioSpec *spec)

src/core/android/SDL_android.h

@@ -52,8 +52,7 @@ extern SDL_DisplayOrientation Android_JNI_GetDisplayOrientation(void);
 extern int Android_JNI_GetDisplayDPI(float *ddpi, float *xdpi, float *ydpi);
 
 /* Audio support */
-extern void Android_JNI_GetAudioOutputDevices(int* devices, int *length);
+extern void Android_DetectDevices(void);
-extern void Android_JNI_GetAudioInputDevices(int* devices, int *length);
 extern int Android_JNI_OpenAudioDevice(int iscapture, int device_id, SDL_AudioSpec *spec);
 extern void *Android_JNI_GetAudioBuffer(void);
 extern void Android_JNI_WriteAudioBuffer(void);