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/*
2 
 * Linux and BSD
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 */
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#include <sys/ioctl.h>
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#ifdef __linux__
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#include <linux/soundcard.h>
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#else
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#include <sys/soundcard.h>
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#endif
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#include	"u.h"
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#include	"lib.h"
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#include	"dat.h"
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#include	"fns.h"
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#include	"error.h"
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#include	"devaudio.h"
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enum
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{
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	Channels = 2,
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	Rate = 44100,
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	Bits = 16,
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	Bigendian = 1,
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};
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static int afd = -1;
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static int cfd= -1;
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static int speed;
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/* maybe this should return -1 instead of sysfatal */
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void
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audiodevopen(void)
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{
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	int t;
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	ulong ul;
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	afd = -1;
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	cfd = -1;
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	if((afd = open("/dev/dsp", OWRITE)) < 0)
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		goto err;
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	if((cfd = open("/dev/mixer", ORDWR)) < 0)
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		goto err;
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	t = Bits;
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	if(ioctl(afd, SNDCTL_DSP_SAMPLESIZE, &t) < 0)
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		goto err;
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	t = Channels-1;
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	if(ioctl(afd, SNDCTL_DSP_STEREO, &t) < 0)
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		goto err;
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	speed = Rate;
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	ul = Rate;
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	if(ioctl(afd, SNDCTL_DSP_SPEED, &ul) < 0)
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		goto err;
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56 
	return;
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58 
err:
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	if(afd >= 0)
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		close(afd);
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	afd = -1;
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	oserror();
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}
64 
 
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void
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audiodevclose(void)
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{
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	close(afd);
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	close(cfd);
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	afd = -1;
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	cfd = -1;
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}
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static struct {
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	int id9;
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	int id;
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} names[] = {
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	Vaudio,	SOUND_MIXER_VOLUME,
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	Vbass, 		SOUND_MIXER_BASS,
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	Vtreb, 		SOUND_MIXER_TREBLE,
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	Vline, 		SOUND_MIXER_LINE,
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	Vpcm, 		SOUND_MIXER_PCM,
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	Vsynth, 		SOUND_MIXER_SYNTH,
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	Vcd, 		SOUND_MIXER_CD,
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	Vmic, 		SOUND_MIXER_MIC,
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//	"record", 		SOUND_MIXER_RECLEV,
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//	"mix",		SOUND_MIXER_IMIX,
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//	"pcm2",		SOUND_MIXER_ALTPCM,
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	Vspeaker,	SOUND_MIXER_SPEAKER
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//	"line1",		SOUND_MIXER_LINE1,
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//	"line2",		SOUND_MIXER_LINE2,
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//	"line3",		SOUND_MIXER_LINE3,
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//	"digital1",	SOUND_MIXER_DIGITAL1,
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//	"digital2",	SOUND_MIXER_DIGITAL2,
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//	"digital3",	SOUND_MIXER_DIGITAL3,
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//	"phonein",		SOUND_MIXER_PHONEIN,
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//	"phoneout",		SOUND_MIXER_PHONEOUT,
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//	"radio",		SOUND_MIXER_RADIO,
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//	"video",		SOUND_MIXER_VIDEO,
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//	"monitor",	SOUND_MIXER_MONITOR,
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//	"igain",		SOUND_MIXER_IGAIN,
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//	"ogain",		SOUND_MIXER_OGAIN,
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};
104 
 
105 
static int
106 
lookname(int id9)
107 
{
108 
	int i;
109 
 
110 
	for(i=0; i<nelem(names); i++)
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		if(names[i].id9 == id9)
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			return names[i].id;
113 
	return -1;
114 
}
115 
 
116 
void
117 
audiodevsetvol(int what, int left, int right)
118 
{
119 
	int id;
120 
	ulong x;
121 
	int can, v;
122 
 
123 
	if(cfd < 0)
124 
		error("audio device not open");
125 
	if(what == Vspeed){
126 
		x = left;
127 
		if(ioctl(afd, SNDCTL_DSP_SPEED, &x) < 0)
128 
			oserror();
129 
		speed = x;
130 
		return;
131 
	}
132 
	if((id = lookname(what)) < 0)
133 
		return;
134 
	if(ioctl(cfd, SOUND_MIXER_READ_DEVMASK, &can) < 0)
135 
		can = ~0;
136 
	if(!(can & (1<<id)))
137 
		return;
138 
	v = left | (right<<8);
139 
	if(ioctl(cfd, MIXER_WRITE(id), &v) < 0)
140 
		oserror();
141 
}
142 
 
143 
void
144 
audiodevgetvol(int what, int *left, int *right)
145 
{
146 
	int id;
147 
	int can, v;
148 
 
149 
	if(cfd < 0)
150 
		error("audio device not open");
151 
	if(what == Vspeed){
152 
		*left = *right = speed;
153 
		return;
154 
	}
155 
	if((id = lookname(what)) < 0)
156 
		return;
157 
	if(ioctl(cfd, SOUND_MIXER_READ_DEVMASK, &can) < 0)
158 
		can = ~0;
159 
	if(!(can & (1<<id)))
160 
		return;
161 
	if(ioctl(cfd, MIXER_READ(id), &v) < 0)
162 
		oserror();
163 
	*left = v&0xFF;
164 
	*right = (v>>8)&0xFF;
165 
}
166 
 
167 
int
168 
audiodevwrite(void *v, int n)
169 
{
170 
	int m, tot;
171 
 
172 
	for(tot=0; tot<n; tot+=m)
173 
		if((m = write(afd, (uchar*)v+tot, n-tot)) <= 0)
174 
			oserror();
175 
	return tot;
176 
}
177 
 
178 
int
179 
audiodevread(void *v, int n)
180 
{
181 
	error("no reading");
182 
	return -1;
183 
}