audioif, mixer control

1 files changed, 50 insertions, 0 deletions

diff --git a/sys/src/9/port/audioif.h b/sys/src/9/port/audioif.h
new file mode 100644
index 000000000..9deaec039
--- /dev/null
+++ b/sys/src/9/port/audioif.h
@@ -0,0 +1,50 @@
+typedef struct Audio Audio;
+typedef struct Volume Volume;
+
+struct Audio
+{
+	char *name;
+
+	void *ctlr;
+	void *mixer;
+
+	long (*read)(Audio *, void *, long, vlong);
+	long (*write)(Audio *, void *, long, vlong);
+	void (*close)(Audio *);
+
+	long (*volread)(Audio *, void *, long, vlong);
+	long (*volwrite)(Audio *, void *, long, vlong);
+
+	long (*ctl)(Audio *, void *, long, vlong);
+	long (*status)(Audio *, void *, long, vlong);
+	long (*buffered)(Audio *);
+
+	int ctlrno;
+	Audio *next;
+};
+
+enum {
+	Left,
+	Right,
+	Stereo,
+	Absolute,
+};
+
+#define Mono Left
+
+struct Volume
+{
+	char *name;
+	int reg;
+	int range;
+	int type;
+	int cap;
+};
+
+extern void addaudiocard(char *, int (*)(Audio *));
+extern long genaudiovolread(Audio *adev, void *a, long n, vlong off,
+	Volume *vol, int (*volget)(Audio *, int, int *),
+	ulong caps);
+extern long genaudiovolwrite(Audio *adev, void *a, long n, vlong off,
+	Volume *vol, int (*volset)(Audio *, int, int *),
+	ulong caps);