alsapcm.java

java处理声音文件

	public static final int	SND_PCM_DIG1_CON_MUSICAL_ID =	0x05;
	public static final int	SND_PCM_DIG1_CON_MAGNETIC_MASK =	0x07;
	public static final int	SND_PCM_DIG1_CON_MAGNETIC_ID =	0x03;
	public static final int	SND_PCM_DIG1_CON_IEC908_CD =	(SND_PCM_DIG1_CON_LASEROPT_ID|0x00);
	public static final int	SND_PCM_DIG1_CON_NON_IEC908_CD =	(SND_PCM_DIG1_CON_LASEROPT_ID|0x08);
	public static final int	SND_PCM_DIG1_CON_PCM_CODER =	(SND_PCM_DIG1_CON_DIGDIGCONV_ID|0x00);
	public static final int	SND_PCM_DIG1_CON_SAMPLER =	(SND_PCM_DIG1_CON_DIGDIGCONV_ID|0x20);
	public static final int	SND_PCM_DIG1_CON_MIXER =		(SND_PCM_DIG1_CON_DIGDIGCONV_ID|0x10);
	public static final int	SND_PCM_DIG1_CON_RATE_CONVERTER =	(SND_PCM_DIG1_CON_DIGDIGCONV_ID|0x18);
	public static final int	SND_PCM_DIG1_CON_SYNTHESIZER =	(SND_PCM_DIG1_CON_MUSICAL_ID|0x00);
	public static final int	SND_PCM_DIG1_CON_MICROPHONE =	(SND_PCM_DIG1_CON_MUSICAL_ID|0x08);
	public static final int	SND_PCM_DIG1_CON_DAT =		(SND_PCM_DIG1_CON_MAGNETIC_ID|0x00);
	public static final int	SND_PCM_DIG1_CON_VCR =		(SND_PCM_DIG1_CON_MAGNETIC_ID|0x08);
	public static final int	SND_PCM_DIG1_CON_ORIGINAL =	(1<<7);	/* this bits depends on the category code */
	public static final int	SND_PCM_DIG2_PRO_SBITS =		(7<<0);	/* mask - sample bits */
	public static final int	SND_PCM_DIG2_PRO_SBITS_20 =	(2<<0);	/* 20-bit - coordination */
	public static final int	SND_PCM_DIG2_PRO_SBITS_24 =	(4<<0);	/* 24-bit - main audio */
	public static final int	SND_PCM_DIG2_PRO_SBITS_UDEF =	(6<<0);	/* user defined application */
	public static final int	SND_PCM_DIG2_PRO_WORDLEN =	(7<<3);	/* mask - source word length */
	public static final int	SND_PCM_DIG2_PRO_WORDLEN_NOTID =	(0<<3);	/* not indicated */
	public static final int	SND_PCM_DIG2_PRO_WORDLEN_22_18 =	(2<<3);	/* 22-bit or 18-bit */
	public static final int	SND_PCM_DIG2_PRO_WORDLEN_23_19 =	(4<<3);	/* 23-bit or 19-bit */
	public static final int	SND_PCM_DIG2_PRO_WORDLEN_24_20 =	(5<<3);	/* 24-bit or 20-bit */
	public static final int	SND_PCM_DIG2_PRO_WORDLEN_20_16 =	(6<<3);	/* 20-bit or 16-bit */
	public static final int	SND_PCM_DIG2_CON_SOURCE =		(15<<0);	/* mask - source number */
	public static final int	SND_PCM_DIG2_CON_SOURCE_UNSPEC =	(0<<0);	/* unspecified */
	public static final int	SND_PCM_DIG2_CON_CHANNEL =	(15<<4);	/* mask - channel number */
	public static final int	SND_PCM_DIG2_CON_CHANNEL_UNSPEC =	(0<<4);	/* unspecified */
	public static final int	SND_PCM_DIG3_CON_FS =		(15<<0);	/* mask - sample frequency */
	public static final int	SND_PCM_DIG3_CON_FS_44100 =	(0<<0);	/* 44.1kHz */
	public static final int	SND_PCM_DIG3_CON_FS_48000 =	(2<<0);	/* 48kHz */
	public static final int	SND_PCM_DIG3_CON_FS_32000 =	(3<<0);	/* 32kHz */
	public static final int	SND_PCM_DIG3_CON_CLOCK =		(3<<4);	/* mask - clock accuracy */
	public static final int	SND_PCM_DIG3_CON_CLOCK_1000PPM =	(0<<4);	/* 1000 ppm */
	public static final int	SND_PCM_DIG3_CON_CLOCK_50PPM =	(1<<4);	/* 50 ppm */
	public static final int	SND_PCM_DIG3_CON_CLOCK_VARIABLE =	(2<<4);	/* variable pitch */



	static
	{
		System.loadLibrary("tritonusalsa");
	}



	/**
	 *	Holds the pointer to snd_pcm_t for the native code.
	 *	This must be long to be 64bit-clean.
	 */
	private long	m_lNativeHandle;



	public AlsaPcm(int nCard,
		       int nDevice,
		       int nDirection)
		throws	Exception
	{
		if (open(nCard,
			 nDevice,
			 nDirection) < 0)
		{
			throw new Exception();
		}
	}



	public AlsaPcm(int nCard,
		       int nDevice,
		       int nSubevice,
		       int nDirection)
		throws	Exception
	{
		if (open(nCard,
			 nDevice,
			 nSubevice,
			 nDirection) < 0)
		{
			throw new Exception();
		}
	}



	/**
	 *	Calls snd_pcm_open().
	 */
	private native int open(
		int nCard,
		int nDevice,
		int nDirection);



	/**
	 *	Calls snd_pcm_open_subdevice().
	 */
	private native int open(
		int nCard,
		int nDevice,
		int nSubdevice,
		int nDirection);



	/**
	 *	Calls snd_pcm_close().
	 */
	public native int close();


	/* does not seem useful:
	   file_descriptor
	 */

	public native int setNonblockMode(int nNonblock);


	/* TODO:
	   pcm_info
	   pcm_channel_info
	 */

	/**
	 *	anValues[0]	type
	 *	anValues[1]	flags
	 *	anValues[2]	playback subdevices
	 *	anValues[3]	capture subdevices
	 *
	 *	astrValues[0]	id
	 *	astrValues[1]	name
	 */
	public native int getInfo(int[] anValues,
				  String[] astrValues);

	/**
	 *	anValues[00]	subdevice
	 *	anValues[01]	channel
	 *	anValues[02]	mode
	 *	anValues[03]	flags
	 *	anValues[04]	formats
	 *	anValues[05]	rates
	 *	anValues[06]	min rate
	 *	anValues[07]	max rate
	 *	anValues[08]	min voices
	 *	anValues[09]	max voices
	 *	anValues[10]	buffer_size
	 *	anValues[11]	min fragment size
	 *	anValues[12]	max fragment size
	 *	anValues[13]	fragment align
	 *	anValues[14]	fifo size
	 *	anValues[15]	transfer block size
	 *	anValues[16]	mmap size
	 *	anValues[17]	mixer device
	 *
	 *	astrValues[0]	subdevice name
	 *
	 *	missing: sync info, digital info, mixer_eid
	 */
	public native int getChannelInfo(int[] anValues,
					 String[] astrValues);



	/**
	 *	Calls snd_pcm_channel_params().
	 */
	public native int setChannelParams(
		int nChannel,
		int nMode,
		// format
		boolean bInterleave,
		int nFormat,
		int nRate,
		int nVoices,
		int nSpecial,
		/* TODO: digital */
		int nStartMode,
		int nStopMode,
		boolean bTime,
		boolean bUstTime,
		int nQueueOrFragSize,
		int nMin,
		int nMax);



	/**
	 *	anValues[00]	channel
	 *	anValues[01]	mode
	 *
	 *	anValues[02]	format
	 *	anValues[03]	rate
	 *	anValues[04]	voices
	 *	anValues[05]	special
	 *
	 *	missing: digital
	 *
	 *	anValues[06]	queue size (only valid if stream mode)
	 *	anValues[07]	frag size (only valid if block mode)
	 *	anValues[08]	frags (only valid if block mode)
	 *	anValues[09]	min frags (only valid if block mode)
	 *	anValues[10]	max frags (only valid if block mode)
	 *	anValues[11]	most significant bits per sample
	 *
	 *	abValues[0]	interleave
	 */
	public native int getChannelSetup(int[] anValues,
					  boolean[] abValues);

	/**
	 *	anValues[0]	mode
	 *	anValues[1]	status
	 *
	 *	anValues[2]	byte count since start
	 *	anValues[3]	current fragment
	 *	anValues[4]	bytes in queue/buffer
	 *	anValues[5]	free bytes in queue
	 *	anValues[6]	underrun count (playback)
	 *	anValues[7]	overrun count (capture)
	 *	anValues[8]	ADC overrange count (capture)
	 *
	 *	alValues[0]	start time
	 *	alValues[1]	ust start time
	 */
	public native int getChannelStatus(int nChannel,
					   int[] anValues,
					   long[] alValues);

	public native int prepareChannel(int nChannel);
	public native int preparePlayback();
	public native int prepareCapture();

	public native int goChannel(int nChannel);
	public native int goPlayback();
	public native int goCapture();

	public native int goSync(/* TODO: */);

	public native int drainPlayback();
	public native int flushChannel(int nChannel);
	public native int flushPlayback();
	public native int flushCapture();
	public native int setPlaybackPause(boolean bEnable);
	public native int getTransferSize(int nChannel);
	public native int write(byte[] abData, int nOffset, int nLength);
	public native int read(byte[] abData, int nOffset, int nLength);

	/* not implemented:
	   writev
	   readv
	   mmap
	   munmap
	   *_format_*
	 */
}



/*** AlsaPcm.java ***/