Audio.h File Reference

Go to the source code of this file.

Defines
#define	AUDIO_H
#define	CHANNELS_MONO   1
#define	CHANNELS_STEREO   2
#define	SAMPLE_SIZE_8_BITS   8
#define	SAMPLE_SIZE_16_BITS   16
#define	SAMPLING_RATE_8KHz   8000
#define	SAMPLING_RATE_44KHz   44100
#define	SAMPLING_RATE_48KHz   48000
#define	SAMPLING_RATE_96KHz   96000
#define	SAMPLING_RATE   SAMPLING_RATE_48KHz
	Sampling rate used by Wr.
#define	STEP   (SAMPLING_RATE / SAMPLING_RATE_8KHz)
	Wr reading increment.
#define	LENGTH   (64 * STEP)
	sequence length
Functions
int	OpenAudioDevice (const char *audioDevice)
	Just opens /dev/dsp and /dev/mixer.
int	SetAudioDevice (int samplingRate, int sampleSize)
	Sets /dev/dsp's parameters and allocates the buffer.
int	CloseAudioDevice ()
	Simply closes /dev/dsp and /dev/mixer.
int	ReadFromAudioDevice (unsigned char *)
	Reads LENGTH samples and stores them in the buffer - LENGTH is defined in Audio.h.
int	PlayBuffer (unsigned char *, long)
	Plays the buffer "buffer" back throug the SoundBlaster.
int	SetMicLevel (int)
	Sets the IGAIN level, acting on the mixer.
char *	Audio_GetLastError ()
	Returns the last error.

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Define Documentation

#define AUDIO_H

#define CHANNELS_MONO   1

#define CHANNELS_STEREO   2

#define LENGTH   (64 * STEP)

sequence length

#define SAMPLE_SIZE_16_BITS   16

#define SAMPLE_SIZE_8_BITS   8

#define SAMPLING_RATE   SAMPLING_RATE_48KHz

Sampling rate used by Wr.

#define SAMPLING_RATE_44KHz   44100

#define SAMPLING_RATE_48KHz   48000

#define SAMPLING_RATE_8KHz   8000

#define SAMPLING_RATE_96KHz   96000

#define STEP   (SAMPLING_RATE / SAMPLING_RATE_8KHz)

Wr reading increment.

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Function Documentation

char* Audio_GetLastError (   )

Returns the last error. Returns: A string containing the last error

int CloseAudioDevice (   )

Simply closes /dev/dsp and /dev/mixer.

int OpenAudioDevice (  const char *  audioDevice  )

Just opens /dev/dsp and /dev/mixer. Parameters: audioDevice  The device to be opened. Should be "/dev/dsp" or "/dev/audio" Returns: +1:success -1:error - Use Audio_GetLastError() for details

int PlayBuffer (  unsigned char *  , long  )

Plays the buffer "buffer" back throug the SoundBlaster. Parameters: [in]  buffer  The buffer to be played. size  The size of the buffer, in bytes. Returns: +1:success -1:error - Use Audio_GetLastError() for details

int ReadFromAudioDevice (  unsigned char *   )

Reads LENGTH samples and stores them in the buffer - LENGTH is defined in Audio.h. Parameters: [out]  buffer  The buffer which will contain read samples. Returns: +1:success -1:error - Use Audio_GetLastError() for details

int SetAudioDevice (  int  samplingRate, int  sampleSize )

Sets /dev/dsp's parameters and allocates the buffer. Parameters: samplingRate  The sapling frequency. Wr uses SAMPLING_RATE_48KHz. samleSize  The size of a sample, in bytes. Wr uses SAMPLE_SIZE_8_BITS. Returns: +1:success -1:error - Use Audio_GetLastError() for details

int SetMicLevel (  int   )

Sets the IGAIN level, acting on the mixer. Parameters: volume  The value of the IGAIN level Returns: +1:success -1:error - Use Audio_GetLastError() for details

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