#+build linux
package alsa

import "core:c"

foreign import alsa "system:asound"

pcm_open_flags :: enum i32 {
	BLOCK = 0x0,
	NONBLOCK = 0x00000001,
	ASYNC = 0x00000002,
}

/** PCM stream (direction) */
pcm_stream_t :: enum i32 {
	/** Playback stream */
	PLAYBACK = 0,
	/** Capture stream */
	CAPTURE,
	LAST = CAPTURE,
}

/** PCM sample format */
pcm_format_t :: enum {
	/** Unknown */
	UNKNOWN = -1,
	/** Signed 8 bit */
	S8 = 0,
	/** Unsigned 8 bit */
	U8,
	/** Signed 16 bit Little Endian */
	S16_LE,
	/** Signed 16 bit Big Endian */
	S16_BE,
	/** Unsigned 16 bit Little Endian */
	U16_LE,
	/** Unsigned 16 bit Big Endian */
	U16_BE,
	/** Signed 24 bit Little Endian using low three bytes in 32-bit word */
	S24_LE,
	/** Signed 24 bit Big Endian using low three bytes in 32-bit word */
	S24_BE,
	/** Unsigned 24 bit Little Endian using low three bytes in 32-bit word */
	U24_LE,
	/** Unsigned 24 bit Big Endian using low three bytes in 32-bit word */
	U24_BE,
	/** Signed 32 bit Little Endian */
	S32_LE,
	/** Signed 32 bit Big Endian */
	S32_BE,
	/** Unsigned 32 bit Little Endian */
	U32_LE,
	/** Unsigned 32 bit Big Endian */
	U32_BE,
	/** Float 32 bit Little Endian, Range -1.0 to 1.0 */
	FLOAT_LE,
	/** Float 32 bit Big Endian, Range -1.0 to 1.0 */
	FLOAT_BE,
	/** Float 64 bit Little Endian, Range -1.0 to 1.0 */
	FLOAT64_LE,
	/** Float 64 bit Big Endian, Range -1.0 to 1.0 */
	FLOAT64_BE,
	/** IEC-958 Little Endian */
	IEC958_SUBFRAME_LE,
	/** IEC-958 Big Endian */
	IEC958_SUBFRAME_BE,
	/** Mu-Law */
	MU_LAW,
	/** A-Law */
	A_LAW,
	/** Ima-ADPCM */
	IMA_ADPCM,
	/** MPEG */
	MPEG,
	/** GSM */
	GSM,
	/** Signed 20bit Little Endian in 4bytes format, LSB justified */
	S20_LE,
	/** Signed 20bit Big Endian in 4bytes format, LSB justified */
	S20_BE,
	/** Unsigned 20bit Little Endian in 4bytes format, LSB justified */
	U20_LE,
	/** Unsigned 20bit Big Endian in 4bytes format, LSB justified */
	U20_BE,
	/** Special */
	SPECIAL = 31,
	/** Signed 24bit Little Endian in 3bytes format */
	S24_3LE = 32,
	/** Signed 24bit Big Endian in 3bytes format */
	S24_3BE,
	/** Unsigned 24bit Little Endian in 3bytes format */
	U24_3LE,
	/** Unsigned 24bit Big Endian in 3bytes format */
	U24_3BE,
	/** Signed 20bit Little Endian in 3bytes format */
	S20_3LE,
	/** Signed 20bit Big Endian in 3bytes format */
	S20_3BE,
	/** Unsigned 20bit Little Endian in 3bytes format */
	U20_3LE,
	/** Unsigned 20bit Big Endian in 3bytes format */
	U20_3BE,
	/** Signed 18bit Little Endian in 3bytes format */
	S18_3LE,
	/** Signed 18bit Big Endian in 3bytes format */
	S18_3BE,
	/** Unsigned 18bit Little Endian in 3bytes format */
	U18_3LE,
	/** Unsigned 18bit Big Endian in 3bytes format */
	U18_3BE,
	/* G.723 (ADPCM) 24 kbit/s, 8 samples in 3 bytes */
	G723_24,
	/* G.723 (ADPCM) 24 kbit/s, 1 sample in 1 byte */
	G723_24_1B,
	/* G.723 (ADPCM) 40 kbit/s, 8 samples in 3 bytes */
	G723_40,
	/* G.723 (ADPCM) 40 kbit/s, 1 sample in 1 byte */
	G723_40_1B,
	/* Direct Stream Digital (DSD) in 1-byte samples (x8) */
	DSD_U8,
	/* Direct Stream Digital (DSD) in 2-byte samples (x16) */
	DSD_U16_LE,
	/* Direct Stream Digital (DSD) in 4-byte samples (x32) */
	DSD_U32_LE,
	/* Direct Stream Digital (DSD) in 2-byte samples (x16) */
	DSD_U16_BE,
	/* Direct Stream Digital (DSD) in 4-byte samples (x32) */
	DSD_U32_BE,
	LAST = DSD_U32_BE,

	/** Signed 16 bit CPU endian */
	S16 = S16_BE when ODIN_ENDIAN == .Big else S16_LE,
	/** Unsigned 16 bit CPU endian */
	U16 = U16_BE when ODIN_ENDIAN == .Big else U16_LE,
	/** Signed 24 bit CPU endian */
	S24 = S24_BE when ODIN_ENDIAN == .Big else S32_LE,
	/** Unsigned 24 bit CPU endian */
	U24 = U24_BE when ODIN_ENDIAN == .Big else U24_LE,
	/** Signed 32 bit CPU endian */
	S32 = S32_BE when ODIN_ENDIAN == .Big else S32_LE,
	/** Unsigned 32 bit CPU endian */
	U32 = U32_BE when ODIN_ENDIAN == .Big else U32_LE,
	/** Float 32 bit CPU endian */
	FLOAT = FLOAT_BE when ODIN_ENDIAN == .Big else FLOAT_LE,
	/** Float 64 bit CPU endian */
	FLOAT64 = FLOAT64_BE when ODIN_ENDIAN == .Big else FLOAT64_LE,
	/** IEC-958 CPU Endian */
	IEC958_SUBFRAME = IEC958_SUBFRAME_BE when ODIN_ENDIAN == .Big else IEC958_SUBFRAME_LE,
	/** Signed 20bit in 4bytes format, LSB justified, CPU Endian */
	S20 = S20_BE when ODIN_ENDIAN == .Big else S20_LE,
	/** Unsigned 20bit in 4bytes format, LSB justified, CPU Endian */
	U20 = U20_BE when ODIN_ENDIAN == .Big else U20_LE,
}

/** PCM access type */
pcm_access_t :: enum {
	/** mmap access with simple interleaved channels */
	MMAP_INTERLEAVED = 0,
	/** mmap access with simple non interleaved channels */
	MMAP_NONINTERLEAVED,
	/** mmap access with complex placement */
	MMAP_COMPLEX,
	/** snd_pcm_readi/snd_pcm_writei access */
	RW_INTERLEAVED,
	/** snd_pcm_readn/snd_pcm_writen access */
	RW_NONINTERLEAVED,
	LAST = RW_NONINTERLEAVED
}

/** channel positions */
pcm_chmap_position :: enum i32 {
	UNKNOWN = 0,	/**< unspecified */
	NA,		/**< N/A, silent */
	MONO,		/**< mono stream */
	FL,		/**< front left */
	FR,		/**< front right */
	RL,		/**< rear left */
	RR,		/**< rear right */
	FC,		/**< front center */
	LFE,		/**< LFE */
	SL,		/**< side left */
	SR,		/**< side right */
	RC,		/**< rear center */
	FLC,		/**< front left center */
	FRC,		/**< front right center */
	RLC,		/**< rear left center */
	RRC,		/**< rear right center */
	FLW,		/**< front left wide */
	FRW,		/**< front right wide */
	FLH,		/**< front left high */
	FCH,		/**< front center high */
	FRH,		/**< front right high */
	TC,		/**< top center */
	TFL,		/**< top front left */
	TFR,		/**< top front right */
	TFC,		/**< top front center */
	TRL,		/**< top rear left */
	TRR,		/**< top rear right */
	TRC,		/**< top rear center */
	TFLC,		/**< top front left center */
	TFRC,		/**< top front right center */
	TSL,		/**< top side left */
	TSR,		/**< top side right */
	LLFE,		/**< left LFE */
	RLFE,		/**< right LFE */
	BC,		/**< bottom center */
	BLC,		/**< bottom left center */
	BRC,		/**< bottom right center */
	LAST = BRC,
}

mixer_selem_channel_id_t :: enum i32 {
	UNKNOWN = -1,
	FRONT_LEFT = 0,
	FRONT_RIGHT,
	REAR_LEFT,
	REAR_RIGHT,
	FRONT_CENTER,
	WOOFER,
	SIDE_LEFT,
	SIDE_RIGHT,
	REAR_CENTER,
	MONO = FRONT_LEFT,
	// LAST = 31,
}

mixer_selem_regopt_abstract :: enum i32 {
	NONE = 0,
	BASIC,
}

pcm_uframes_t :: c.ulong
pcm_sframes_t :: c.long
pcm_t :: struct{}
pcm_hw_params_t :: struct{}
mixer_t :: struct{}
mixer_class_t :: struct{}
mixer_selem_id_t :: struct{}
mixer_elem_t :: struct{}

pcm_chmap_t :: struct {
	// Number of channels
	channels: u32,
	// Channel position array
	pos: [0]u32,
}

mixer_selem_regopt :: struct {
	ver: c.int,
	abstract: mixer_selem_regopt_abstract,
	device: cstring,
	playback_pcm: ^pcm_t,
	capture_pcm: ^pcm_t,
}

@(link_prefix="snd_")
foreign alsa {
	pcm_open :: proc(pcmp: ^^pcm_t, name: cstring, stream: pcm_stream_t, mode: pcm_open_flags) -> i32 ---
	strerror :: proc(errnum: i32) -> cstring ---
	pcm_set_params :: proc(
		pcm: ^pcm_t,
		format: pcm_format_t,
		access: pcm_access_t,
		channels: u32,
		rate: u32,
		soft_resample: i32,
		latency: u32) -> i32 ---
	pcm_drain :: proc(pcm: ^pcm_t) -> i32 ---
	pcm_close :: proc(pcm: ^pcm_t) -> i32 ---
	pcm_prepare :: proc(pcm: ^pcm_t) -> i32 ---
	pcm_writei :: proc(pcm: ^pcm_t, buffer: rawptr, size: pcm_uframes_t) -> pcm_sframes_t ---
	pcm_writen :: proc(pcm: ^pcm_t, bufs: [^]rawptr, size: pcm_uframes_t) -> pcm_sframes_t ---
	pcm_readi :: proc(pcm: ^pcm_t, buffer: rawptr, size: pcm_uframes_t) -> pcm_sframes_t ---
	pcm_readn :: proc(pcm: ^pcm_t, bufs: [^]rawptr, size: pcm_uframes_t) -> pcm_sframes_t ---
	pcm_format_width :: proc(format: pcm_format_t) -> i32 ---
	pcm_hw_params_set_channels :: proc(pcm: ^pcm_t, params: ^pcm_hw_params_t, val: u32) ---
	pcm_chmap_long_name :: proc(val: pcm_chmap_position) -> cstring ---
	pcm_get_chmap :: proc(pcm: ^pcm_t) -> ^pcm_chmap_t ---

	mixer_open :: proc(mixerp: ^^mixer_t, mode: c.int) -> c.int ---
	mixer_attach :: proc(mixer: ^mixer_t, name: cstring) -> c.int ---
	mixer_selem_register :: proc(mixer: ^mixer_t, options: ^mixer_selem_regopt, classp: ^^mixer_class_t) -> c.int ---
	mixer_load :: proc(mixer: ^mixer_t) -> c.int ---
	mixer_first_elem :: proc(mixer: ^mixer_t) -> ^mixer_elem_t ---
	mixer_elem_next :: proc(elem: ^mixer_elem_t) -> ^mixer_elem_t ---
	// MACRO: mixer_selem_id_alloca :: proc() ---
	mixer_selem_id_malloc :: proc(ptr: ^^mixer_selem_id_t) -> c.int ---
	mixer_selem_id_set_index :: proc(obj: ^mixer_selem_id_t, val: c.uint) ---
	mixer_selem_id_set_name :: proc(obj: ^mixer_selem_id_t, val: cstring) ---
	mixer_selem_get_name :: proc(elem: ^mixer_elem_t) -> cstring ---
	mixer_find_selem :: proc(mixer: ^mixer_t, id: ^mixer_selem_id_t) -> ^mixer_elem_t ---
	mixer_selem_has_playback_switch :: proc(elem: ^mixer_elem_t) -> b32 ---
	mixer_selem_set_playback_switch_all :: proc(elem: ^mixer_elem_t, value: c.int) -> c.int ---
	/*
		Return value of playback switch control of a mixer simple element. 

		Parameters
			elem	Mixer simple element handle
			channel	mixer simple element channel identifier
			value	pointer to returned value

		Returns
			0 on success otherwise a negative error code 
	*/
	mixer_selem_get_playback_switch :: proc(elem: ^mixer_elem_t, channel: mixer_selem_channel_id_t, value: ^c.int) -> c.int ---
	mixer_selem_has_capture_switch :: proc(mixer: ^mixer_elem_t) -> b32 ---
	mixer_selem_get_capture_switch :: proc(elem: ^mixer_elem_t, channel: mixer_selem_channel_id_t, value: ^c.int) -> c.int ---
	mixer_selem_set_capture_switch :: proc(elem: ^mixer_elem_t, channel: mixer_selem_channel_id_t, value: c.int) -> c.int ---
	mixer_selem_id_free :: proc(obj: ^mixer_selem_id_t) ---
	mixer_close :: proc(mixer: ^mixer_t) -> c.int ---

	device_name_hint :: proc(card: c.int, iface: cstring, hints: ^[^]rawptr) -> c.int ---
	device_name_get_hint :: proc(hint: rawptr, id: cstring) -> cstring ---
	device_name_free_hint :: proc(hints: [^]rawptr) -> c.int ---
}