The C and C++ Include Header Files

/usr/include/sound/asound_fm.h


$ cat -n /usr/include/sound/asound_fm.h

     1	/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
     2	#ifndef __SOUND_ASOUND_FM_H
     3	#define __SOUND_ASOUND_FM_H
     4	
     5	/*
     6	 *  Advanced Linux Sound Architecture - ALSA
     7	 *
     8	 *  Interface file between ALSA driver & user space
     9	 *  Copyright (c) 1994-98 by Jaroslav Kysela <perex@perex.cz>,
    10	 *                           4Front Technologies
    11	 *
    12	 *  Direct FM control
    13	 */
    14	
    15	#define SNDRV_DM_FM_MODE_OPL2	0x00
    16	#define SNDRV_DM_FM_MODE_OPL3	0x01
    17	
    18	struct snd_dm_fm_info {
    19		unsigned char fm_mode;		/* OPL mode, see SNDRV_DM_FM_MODE_XXX */
    20		unsigned char rhythm;		/* percussion mode flag */
    21	};
    22	
    23	/*
    24	 *  Data structure composing an FM "note" or sound event.
    25	 */
    26	
    27	struct snd_dm_fm_voice {
    28		unsigned char op;		/* operator cell (0 or 1) */
    29		unsigned char voice;		/* FM voice (0 to 17) */
    30	
    31		unsigned char am;		/* amplitude modulation */
    32		unsigned char vibrato;		/* vibrato effect */
    33		unsigned char do_sustain;	/* sustain phase */
    34		unsigned char kbd_scale;	/* keyboard scaling */
    35		unsigned char harmonic;		/* 4 bits: harmonic and multiplier */
    36		unsigned char scale_level;	/* 2 bits: decrease output freq rises */
    37		unsigned char volume;		/* 6 bits: volume */
    38	
    39		unsigned char attack;		/* 4 bits: attack rate */
    40		unsigned char decay;		/* 4 bits: decay rate */
    41		unsigned char sustain;		/* 4 bits: sustain level */
    42		unsigned char release;		/* 4 bits: release rate */
    43	
    44		unsigned char feedback;		/* 3 bits: feedback for op0 */
    45		unsigned char connection;	/* 0 for serial, 1 for parallel */
    46		unsigned char left;		/* stereo left */
    47		unsigned char right;		/* stereo right */
    48		unsigned char waveform;		/* 3 bits: waveform shape */
    49	};
    50	
    51	/*
    52	 *  This describes an FM note by its voice, octave, frequency number (10bit)
    53	 *  and key on/off.
    54	 */
    55	
    56	struct snd_dm_fm_note {
    57		unsigned char voice;	/* 0-17 voice channel */
    58		unsigned char octave;	/* 3 bits: what octave to play */
    59		unsigned int fnum;	/* 10 bits: frequency number */
    60		unsigned char key_on;	/* set for active, clear for silent */
    61	};
    62	
    63	/*
    64	 *  FM parameters that apply globally to all voices, and thus are not "notes"
    65	 */
    66	
    67	struct snd_dm_fm_params {
    68		unsigned char am_depth;		/* amplitude modulation depth (1=hi) */
    69		unsigned char vib_depth;	/* vibrato depth (1=hi) */
    70		unsigned char kbd_split;	/* keyboard split */
    71		unsigned char rhythm;		/* percussion mode select */
    72	
    73		/* This block is the percussion instrument data */
    74		unsigned char bass;
    75		unsigned char snare;
    76		unsigned char tomtom;
    77		unsigned char cymbal;
    78		unsigned char hihat;
    79	};
    80	
    81	/*
    82	 *  FM mode ioctl settings
    83	 */
    84	
    85	#define SNDRV_DM_FM_IOCTL_INFO		_IOR('H', 0x20, struct snd_dm_fm_info)
    86	#define SNDRV_DM_FM_IOCTL_RESET		_IO ('H', 0x21)
    87	#define SNDRV_DM_FM_IOCTL_PLAY_NOTE	_IOW('H', 0x22, struct snd_dm_fm_note)
    88	#define SNDRV_DM_FM_IOCTL_SET_VOICE	_IOW('H', 0x23, struct snd_dm_fm_voice)
    89	#define SNDRV_DM_FM_IOCTL_SET_PARAMS	_IOW('H', 0x24, struct snd_dm_fm_params)
    90	#define SNDRV_DM_FM_IOCTL_SET_MODE	_IOW('H', 0x25, int)
    91	/* for OPL3 only */
    92	#define SNDRV_DM_FM_IOCTL_SET_CONNECTION	_IOW('H', 0x26, int)
    93	/* SBI patch management */
    94	#define SNDRV_DM_FM_IOCTL_CLEAR_PATCHES	_IO ('H', 0x40)
    95	
    96	#define SNDRV_DM_FM_OSS_IOCTL_RESET		0x20
    97	#define SNDRV_DM_FM_OSS_IOCTL_PLAY_NOTE		0x21
    98	#define SNDRV_DM_FM_OSS_IOCTL_SET_VOICE		0x22
    99	#define SNDRV_DM_FM_OSS_IOCTL_SET_PARAMS	0x23
   100	#define SNDRV_DM_FM_OSS_IOCTL_SET_MODE		0x24
   101	#define SNDRV_DM_FM_OSS_IOCTL_SET_OPL		0x25
   102	
   103	/*
   104	 * Patch Record - fixed size for write
   105	 */
   106	
   107	#define FM_KEY_SBI	"SBI\032"
   108	#define FM_KEY_2OP	"2OP\032"
   109	#define FM_KEY_4OP	"4OP\032"
   110	
   111	struct sbi_patch {
   112		unsigned char prog;
   113		unsigned char bank;
   114		char key[4];
   115		char name[25];
   116		char extension[7];
   117		unsigned char data[32];
   118	};
   119	
   120	#endif /* __SOUND_ASOUND_FM_H */