add alsa

include/sound.hpp

@@ -0,0 +1,27 @@
+#ifndef GPU_SCREEN_RECORDER_H
+#define GPU_SCREEN_RECORDER_H
+
+typedef struct {
+    void *handle;
+    char *buffer;
+    int buffer_size;
+    unsigned int frames;
+} SoundDevice;
+
+/*
+    Get a sound device by name, returning the device into the @device parameter.
+    The device should be closed with @sound_device_close after it has been used
+    to clean up internal resources.
+    Returns 0 on success, or a negative value on failure.
+*/
+int sound_device_get_by_name(SoundDevice *device, const char *name = "default", unsigned int num_channels = 1, unsigned int period_frame_size = 32);
+
+int sound_device_close(SoundDevice *device);
+
+/*
+    Returns the next chunk of audio into @buffer.
+    Returns the size of the buffer, or a negative value on failure.
+*/
+int sound_device_read_next_chunk(SoundDevice *device, char **buffer);
+
+#endif /* GPU_SCREEN_RECORDER_H */