+#define AUDIO_SAMPLE_RATE_8000 8000
+#define AUDIO_SAMPLE_RATE_22050 22050
+
+#define AUDIO_FRAGMENT_SIZE_512 512
+#define AUDIO_FRAGMENT_SIZE_1024 1024
+#define AUDIO_FRAGMENT_SIZE_2048 2048
+#define AUDIO_FRAGMENT_SIZE_4096 4096
+
+#define AUDIO_MONO_CHANNEL 1
+#define AUDIO_STEREO_CHANNELS 2
+
+#if defined(TARGET_SDL)
+/* one second fading interval == 1000 ticks (milliseconds) */
+#define SOUND_FADING_INTERVAL 1000
+#define SOUND_MAX_VOLUME SDL_MIX_MAXVOLUME
+#endif
+
+#if defined(AUDIO_STREAMING_DSP)
+#define SOUND_FADING_VOLUME_STEP (PSND_MAX_VOLUME / 40)
+#define SOUND_FADING_VOLUME_THRESHOLD (SOUND_FADING_VOLUME_STEP * 2)
+#endif
+
+#define DEFAULT_AUDIO_SAMPLE_RATE AUDIO_SAMPLE_RATE_22050
+#define DEFAULT_AUDIO_FRAGMENT_SIZE_UNIX AUDIO_FRAGMENT_SIZE_512
+#define DEFAULT_AUDIO_FRAGMENT_SIZE_WIN32 AUDIO_FRAGMENT_SIZE_2048
+
+#if defined(PLATFORM_UNIX)
+#define DEFAULT_AUDIO_FRAGMENT_SIZE DEFAULT_AUDIO_FRAGMENT_SIZE_UNIX
+#else
+#define DEFAULT_AUDIO_FRAGMENT_SIZE DEFAULT_AUDIO_FRAGMENT_SIZE_WIN32
+#endif
+