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PCM conversion [Device driver] Detailed Description convert PCM from and to internal format. Data Structures struct   liso_convertor_t   Audio format convertor info. More... PCM convertor functions const liso_convertor_t *  liso_pcmconv_get (int fmt)   Get convertor info for a given format. char *  liso_pcmconv_desc (const liso_convertor_t *convertor, liso_fmt_desc_t buf, int sampling, int stereo)   Make a description string. int  liso_pcmconv_get_fmts (void)   Get supported audio format. Typedefs typedef void(*  liso_topcm_t )(int *d, const void *s, int n)   To internal PCM conversion. typedef void(*  liso_tofmt_t )(void *d, const int *s, const int f, int n)   From internal PCM conversion. typedef char  liso_fmt_desc_t [24]   Format description string. Typedef Documentation typedef void(* liso_topcm_t)(int *d, const void *s, int n)   To internal PCM conversion. These functions convert OSS PCM format to lisodsp internal one. Internaly the PCM format is stereo signed 16 bit machine endian. Each PCM is stored in an int with left channel in the 16 LSB and right channel in the 16 MSB (It implies integer is at least 32 bit wide). Each function name is composed with: u8/s8/u16/s16 for signed/unsigned 8-bit/16-bit le/be for big-endian/little-endian m/s for mono/stereo Parameters: d  Destination buffer (one integer by PCM) s  Source buffer n  Number of PCM to convert typedef void(* liso_tofmt_t)(void *d, const int *s, const int f, int n)   From internal PCM conversion. These functions convert lisodsp internal mixed-PCM to OSS PCM format. Internaly the mixed-PCM format is stereo signed int so each PCM is stored in two integers (left channel comes first). These values have a weight depending in the number of the number voices added so far. Normalization is performed by a factor which must be equal to (2^liso_MIXER_FIX)/#-channel-added. Each function name is composed with: u8/s8/u16/s16 for signed/unsigned 8-bit/16-bit le/be for big-endian/little-endian m/s for mono/stereo Parameters: d  Destination buffer (one integer by PCM) s  Source buffer f  Normalization factor (2^14/channels) n  Number of PCM to convert Function Documentation const liso_convertor_t* liso_pcmconv_get (  int  fmt  )    Get convertor info for a given format. Parameters: fmt  Linux audio format (AFMT_???). Returns: matching convertor Return values: 0  error char* liso_pcmconv_desc (  const liso_convertor_t *  convertor, liso_fmt_desc_t  buf, int  sampling, int  stereo )    Make a description string. Parameters: convertor  Audio format convertor. buf  Destination buffer sampling  Sampling rate in hz. stereo  0:mono other:stereo Return values: buf  Always return buf, no error int liso_pcmconv_get_fmts (  void   )    Get supported audio format. Returns: ORed value of all support AFMT_???.

lisodsp developer documentation version 0.5.0 Generated on June 2004 by doxygen 1.3.7