164 lines
5.1 KiB
C
164 lines
5.1 KiB
C
/*
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* wav.h
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*
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* This file includes the definitions for the wav file format.
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*
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* $Id: wav.h,v 1.4 1998/09/09 21:06:40 gert Exp $
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*
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*/
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#define WAVE_FORMAT_UNKNOWN (0x0000)
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#define WAVE_FORMAT_PCM (0x0001)
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#define WAVE_FORMAT_ADPCM (0x0002)
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#define WAVE_FORMAT_ALAW (0x0006)
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#define WAVE_FORMAT_MULAW (0x0007)
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#define WAVE_FORMAT_OKI_ADPCM (0x0010)
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#define WAVE_FORMAT_DIGISTD (0x0015)
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#define WAVE_FORMAT_DIGIFIX (0x0016)
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#define IBM_FORMAT_MULAW (0x0101)
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#define IBM_FORMAT_ALAW (0x0102)
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#define IBM_FORMAT_ADPCM (0x0103)
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/*
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* Handler structure for each format.
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*/
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typedef struct format
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{
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char **names; /* file type names */
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int flags; /* details about file type */
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int (*startread)();
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int (*read)();
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int (*stopread)();
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int (*startwrite)();
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int (*write)();
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int (*stopwrite)();
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} format_t;
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extern format_t formats[];
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/* Signal parameters */
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struct signalinfo
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{
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long rate; /* sampling rate */
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int size; /* word length of data */
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int style; /* format of sample numbers */
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int channels; /* number of sound channels */
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};
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/* Loop parameters */
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struct loopinfo
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{
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int start; /* first sample */
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int length; /* length */
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int count; /* number of repeats, 0=forever */
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int type; /* 0=no, 1=forward, 2=forward/back */
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};
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/* Instrument parameters */
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/* vague attempt at generic information for sampler-specific info */
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struct instrinfo
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{
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char MIDInote; /* for unity pitch playback */
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char MIDIlow, MIDIhi;/* MIDI pitch-bend range */
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char loopmode; /* semantics of loop data */
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char nloops; /* number of active loops */
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unsigned char smpte[4]; /* SMPTE offset (hour:min:sec:frame) */
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/* this is a film audio thing */
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};
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#define MIDI_UNITY 60 /* MIDI note number to play sample at unity */
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/* Loop modes */
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#define LOOP_NONE 0
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#define LOOP_8 1 /* 8 loops: don't know ?? */
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#define LOOP_SUSTAIN_DECAY 2 /* AIFF style: one sustain & one decay loop */
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/*
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* Format information for input and output files.
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*/
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#define PRIVSIZE 100
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#define NLOOPS 8
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struct soundstream
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{
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struct signalinfo info; /* signal specifications */
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struct instrinfo instr; /* instrument specification */
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struct loopinfo loops[NLOOPS]; /* Looping specification */
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char swap; /* do byte- or word-swap */
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char seekable; /* can seek on this file */
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char *filename; /* file name */
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char *filetype; /* type of file */
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char *comment; /* comment string */
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FILE *fp; /* File stream pointer */
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format_t *h; /* format struct for this file */
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double priv[PRIVSIZE/8]; /* format's private data area */
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};
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extern struct soundstream informat, outformat;
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typedef struct soundstream *ft_t;
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/* flags field */
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#define FILE_STEREO 1 /* does file format support stereo? */
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#define FILE_LOOPS 2 /* does file format support loops? */
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#define FILE_INSTR 4 /* does file format support instrument specificications? */
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/* Size field */
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#define BYTE 1
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#define WORD 2
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#define LONG 4
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#define FLOAT 5
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#define DOUBLE 6
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#define IEEE 7 /* IEEE 80-bit floats. Is it necessary? */
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/* Style field */
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#define UNSIGNED 1 /* unsigned linear: Sound Blaster */
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#define SIGN2 2 /* signed linear 2's comp: Mac */
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#define ULAW 3 /* U-law signed logs: US telephony, SPARC */
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#define ALAW 4 /* A-law signed logs: non-US telephony */
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extern char *sizes[], *styles[];
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/*
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* Handler structure for each effect.
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*/
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typedef struct
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{
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char *name; /* effect name */
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int flags; /* this and that */
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int (*getopts)(); /* process arguments */
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int (*start)(); /* start off effect */
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int (*flow)(); /* do a buffer */
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int (*drain)(); /* drain out at end */
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int (*stop)(); /* finish up effect */
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} effect_t;
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extern effect_t effects[];
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#define EFF_CHAN 1 /* Effect can mix channels up/down */
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#define EFF_RATE 2 /* Effect can alter data rate */
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#define EFF_MCHAN 4 /* Effect can handle multi-channel */
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#define EFF_REPORT 8 /* Effect does nothing */
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struct effect
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{
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char *name; /* effect name */
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struct signalinfo ininfo; /* input signal specifications */
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struct loopinfo loops[8]; /* input loops specifications */
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struct instrinfo instr; /* input instrument specifications */
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struct signalinfo outinfo; /* output signal specifications */
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effect_t *h; /* effects driver */
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long *obuf; /* output buffer */
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long odone, olen; /* consumed, total length */
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double priv[PRIVSIZE]; /* private area for effect */
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};
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typedef struct effect *eff_t;
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