wav64.c File Reference

Support for WAV64 audio files. More...

Macros
#define	VADPCM_REFERENCE_DECODER   0
	Set to 1 to use the reference C decode for VADPCM.
#define	WAV_RIFF_ID   "RIFF"
#define	WAV_RIFX_ID   "RIFX"

Functions
void	raw_waveform_read (samplebuffer_t *sbuf, int base_rom_addr, int wpos, int wlen, int bps)
	Utility function to help implementing WaveformRead for uncompressed (raw) samples.
void	wav64_open (wav64_t *wav, const char *fn)
	Open a WAV64 file for playback.
void	wav64_play (wav64_t *wav, int ch)
	Start playing a WAV64 file.
void	wav64_set_loop (wav64_t *wav, bool loop)
	Configure a WAV64 file for looping playback.
int	wav64_get_bitrate (wav64_t *wav)
	Get the (possibly compressed) bitrate of the WAV64 file.
void	wav64_close (wav64_t *wav)
	Close a WAV64 file.

Variables
int64_t	__wav64_profile_dma = 0
	Profile of DMA usage by WAV64, used for debugging purposes.

Detailed Description

Support for WAV64 audio files.

Macro Definition Documentation

WAV_RIFF_ID

#define WAV_RIFF_ID   "RIFF"

ID of a standard WAV file

WAV_RIFX_ID

#define WAV_RIFX_ID   "RIFX"

ID of a WAVX file (big-endian WAV)

Function Documentation

raw_waveform_read()

void raw_waveform_read	(	samplebuffer_t *	sbuf,
		int	base_rom_addr,
		int	wpos,
		int	wlen,
		int	bps
	)

Utility function to help implementing WaveformRead for uncompressed (raw) samples.

This function uses PI DMA to load samples from ROM into the sample buffer.

wav64_open()

void wav64_open	(	wav64_t *	wav,
		const char *	fn
	)

Open a WAV64 file for playback.

This function opens the file, parses the header, and initializes for playing back through the audio mixer.

Parameters

wav	Pointer to wav64_t structure
fn	Filename of the wav64 (with filesystem prefix). Currently, only files on DFS ("rom:/") are supported.

wav64_play()

void wav64_play	(	wav64_t *	wav,
		int	ch
	)

Start playing a WAV64 file.

This is just a simple wrapper that calls mixer_ch_play on the WAV64's waveform (wav64_t::wave). For advanced usages, please call directly the mixer functions.

Parameters

wav	Pointer to wav64_t structure
ch	Channel of the mixer to use for playback.

wav64_get_bitrate()

int wav64_get_bitrate

(

wav64_t *

wav

)

Get the (possibly compressed) bitrate of the WAV64 file.

Parameters

wav	Pointer to wav64_t structure

Returns

int Bitrate in bits per second

wav64_close()

void wav64_close

(

wav64_t *

wav

)

Close a WAV64 file.

Parameters

wav	Pointer to wav64_t structure