Add OpenAL-soft 29e0af5ef052a3602f9b7935d6002c6d2ae5e8cb.

Needed because of race condition fix in mmdevapi backend.

libs/openal-soft-1.15.1-29e0af5ef052/examples/common/alhelpers.h

@@ -0,0 +1,51 @@
+#ifndef ALHELPERS_H
+#define ALHELPERS_H
+
+#ifndef _WIN32
+#include <unistd.h>
+#define Sleep(x) usleep((x)*1000)
+#else
+#define WIN32_LEAN_AND_MEAN
+#include <windows.h>
+#endif
+
+#include "AL/alc.h"
+#include "AL/al.h"
+#include "AL/alext.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+/* Some helper functions to get the name from the channel and type enums. */
+const char *ChannelsName(ALenum chans);
+const char *TypeName(ALenum type);
+
+/* Helpers to convert frame counts and byte lengths. */
+ALsizei FramesToBytes(ALsizei size, ALenum channels, ALenum type);
+ALsizei BytesToFrames(ALsizei size, ALenum channels, ALenum type);
+
+/* Retrieves a compatible buffer format given the channel configuration and
+ * sample type. If an alIsBufferFormatSupportedSOFT-compatible function is
+ * provided, it will be called to find the closest-matching format from
+ * AL_SOFT_buffer_samples. Returns AL_NONE (0) if no supported format can be
+ * found. */
+ALenum GetFormat(ALenum channels, ALenum type, LPALISBUFFERFORMATSUPPORTEDSOFT palIsBufferFormatSupportedSOFT);
+
+/* Loads samples into a buffer using the standard alBufferData call, but with a
+ * LPALBUFFERSAMPLESSOFT-compatible prototype. Assumes internalformat is valid
+ * for alBufferData, and that channels and type match it. */
+void AL_APIENTRY wrap_BufferSamples(ALuint buffer, ALuint samplerate,
+                                    ALenum internalformat, ALsizei samples,
+                                    ALenum channels, ALenum type,
+                                    const ALvoid *data);
+
+/* Easy device init/deinit functions. InitAL returns 0 on success. */
+int InitAL(void);
+void CloseAL(void);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* ALHELPERS_H */