#+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,
}

pcm_uframes_t :: c.ulong
pcm_sframes_t :: c.long
pcm_t :: struct{}
pcm_hw_params_t :: struct{}

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

@(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_writei :: proc(pcm: ^pcm_t, buffer: rawptr, size: pcm_uframes_t) -> pcm_sframes_t ---
	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 ---
}