1 =============================================
2 Sound Blaster Audigy mixer / default DSP code
3 =============================================
4
5 This is based on sb-live-mixer.rst.
6
7 The EMU10K2 chips have a DSP part which can be
8 various ways of sample processing, which is de
9 (This article does not deal with the overall f
10 EMU10K2 chips. See the manuals section for fur
11
12 The ALSA driver programs this portion of chip
13 (can be altered later) which offers the follow
14
15
16 Digital mixer controls
17 ======================
18
19 These controls are built using the DSP instruc
20 functionality. Only the default built-in code
21 here. Note that the controls work as attenuato
22 neutral position leaving the signal unchanged.
23 is mentioned in multiple controls, the signal
24 (set to maximal or minimal value without check
25
26
27 Explanation of used abbreviations:
28
29 DAC
30 digital to analog converter
31 ADC
32 analog to digital converter
33 I2S
34 one-way three wire serial bus for digi
35 (this standard is used for connecting
36 LFE
37 low frequency effects (used as subwoof
38 AC97
39 a chip containing an analog mixer, D/A
40 IEC958
41 S/PDIF
42 FX-bus
43 the EMU10K2 chip has an effect bus con
44 Each of the synthesizer voices can fee
45 and the DSP microcontroller can operat
46
47 name='PCM Front Playback Volume',index=0
48 ----------------------------------------
49 This control is used to attenuate samples from
50 accumulators. ALSA uses accumulators 8 and 9 f
51 samples for 5.1 playback. The result samples a
52
53 name='PCM Surround Playback Volume',index=0
54 -------------------------------------------
55 This control is used to attenuate samples from
56 accumulators. ALSA uses accumulators 2 and 3 f
57 samples for 5.1 playback. The result samples a
58 speakers.
59
60 name='PCM Side Playback Volume',index=0
61 ---------------------------------------
62 This control is used to attenuate samples from
63 accumulators. ALSA uses accumulators 14 and 15
64 samples for 7.1 playback. The result samples a
65
66 name='PCM Center Playback Volume',index=0
67 -----------------------------------------
68 This control is used to attenuate samples from
69 ALSA uses accumulator 6 for center PCM samples
70 samples are forwarded to the center speaker.
71
72 name='PCM LFE Playback Volume',index=0
73 --------------------------------------
74 This control is used to attenuate sample for L
75 ALSA uses accumulator 7 for LFE PCM samples fo
76 samples are forwarded to the subwoofer.
77
78 name='PCM Playback Volume',index=0
79 ----------------------------------
80 This control is used to attenuate samples from
81 accumulators. ALSA uses accumulators 0 and 1 f
82 stereo playback. The result samples are forwar
83
84 name='PCM Capture Volume',index=0
85 ---------------------------------
86 This control is used to attenuate samples from
87 accumulators. ALSA uses accumulators 0 and 1 f
88 stereo playback. The result is forwarded to th
89
90 name='Music Playback Volume',index=0
91 ------------------------------------
92 This control is used to attenuate samples from
93 accumulators. ALSA uses accumulators 4 and 5 f
94 The result samples are forwarded to the virtua
95
96 name='Music Capture Volume',index=0
97 -----------------------------------
98 These controls are used to attenuate samples f
99 accumulator. ALSA uses accumulators 4 and 5 fo
100 The result is forwarded to the standard captur
101
102 name='Mic Playback Volume',index=0
103 ----------------------------------
104 This control is used to attenuate samples from
105 the AC97 codec. The result samples are forward
106
107 name='Mic Capture Volume',index=0
108 ---------------------------------
109 This control is used to attenuate samples from
110 the AC97 codec. The result is forwarded to the
111
112 The original samples are also forwarded to the
113 16bit/8KHz mono) without volume control.
114
115 name='Audigy CD Playback Volume',index=0
116 ----------------------------------------
117 This control is used to attenuate samples from
118 digital inputs (usually used by a CDROM drive)
119 forwarded to the virtual stereo mixer.
120
121 name='Audigy CD Capture Volume',index=0
122 ---------------------------------------
123 This control is used to attenuate samples from
124 digital inputs (usually used by a CDROM drive)
125 to the standard capture PCM device.
126
127 name='IEC958 Optical Playback Volume',index=0
128 ---------------------------------------------
129 This control is used to attenuate samples from
130 digital input. The result samples are forwarde
131
132 name='IEC958 Optical Capture Volume',index=0
133 --------------------------------------------
134 This control is used to attenuate samples from
135 digital inputs. The result is forwarded to the
136
137 name='Line2 Playback Volume',index=0
138 ------------------------------------
139 This control is used to attenuate samples from
140 inputs (on the AudigyDrive). The result sample
141 stereo mixer.
142
143 name='Line2 Capture Volume',index=1
144 -----------------------------------
145 This control is used to attenuate samples from
146 inputs (on the AudigyDrive). The result is for
147 PCM device.
148
149 name='Analog Mix Playback Volume',index=0
150 -----------------------------------------
151 This control is used to attenuate samples from
152 inputs from Philips ADC. The result samples ar
153 stereo mixer. This contains mix from analog so
154
155 name='Analog Mix Capture Volume',index=1
156 ----------------------------------------
157 This control is used to attenuate samples from
158 inputs Philips ADC. The result is forwarded to
159
160 name='Aux2 Playback Volume',index=0
161 -----------------------------------
162 This control is used to attenuate samples from
163 inputs (on the AudigyDrive). The result sample
164 stereo mixer.
165
166 name='Aux2 Capture Volume',index=1
167 ----------------------------------
168 This control is used to attenuate samples from
169 inputs (on the AudigyDrive). The result is for
170 PCM device.
171
172 name='Front Playback Volume',index=0
173 ------------------------------------
174 This control is used to attenuate samples from
175 The result samples are forwarded to the front
176
177 name='Surround Playback Volume',index=0
178 ---------------------------------------
179 This control is used to attenuate samples from
180 The result samples are forwarded to the surrou
181
182 name='Side Playback Volume',index=0
183 -----------------------------------
184 This control is used to attenuate samples from
185 The result samples are forwarded to the side s
186
187 name='Center Playback Volume',index=0
188 -------------------------------------
189 This control is used to attenuate samples from
190 The result samples are forwarded to the center
191
192 name='LFE Playback Volume',index=0
193 ----------------------------------
194 This control is used to attenuate samples from
195 The result samples are forwarded to the subwoo
196
197 name='Tone Control - Switch',index=0
198 ------------------------------------
199 This control turns the tone control on or off.
200 the speaker outputs are affected.
201
202 name='Tone Control - Bass',index=0
203 ----------------------------------
204 This control sets the bass intensity. There is
205 When the tone control code is activated, the s
206 The closest value to pure signal is 20.
207
208 name='Tone Control - Treble',index=0
209 ------------------------------------
210 This control sets the treble intensity. There
211 When the tone control code is activated, the s
212 The closest value to pure signal is 20.
213
214 name='Master Playback Volume',index=0
215 -------------------------------------
216 This control is used to attenuate samples forw
217
218 name='IEC958 Optical Raw Playback Switch',inde
219 ----------------------------------------------
220 If this switch is on, then the samples for the
221 output are taken only from the raw iec958 ALSA
222 accumulators 20 and 21 for left and right PCM
223
224
225 PCM stream related controls
226 ===========================
227
228 name='EMU10K1 PCM Volume',index 0-31
229 ------------------------------------
230 Channel volume attenuation in range 0-0x1fffd.
231 attenuation) is default. The channel mapping f
232 as follows:
233
234 * 0 - mono, default 0xffff (no attenuation)
235 * 1 - left, default 0xffff (no attenuation)
236 * 2 - right, default 0xffff (no attenuation)
237
238 name='EMU10K1 PCM Send Routing',index 0-31
239 ------------------------------------------
240 This control specifies the destination - FX-bu
241 values in this mapping:
242
243 * 0 - mono, A destination (FX-bus 0-63), def
244 * 1 - mono, B destination (FX-bus 0-63), def
245 * 2 - mono, C destination (FX-bus 0-63), def
246 * 3 - mono, D destination (FX-bus 0-63), def
247 * 4 - mono, E destination (FX-bus 0-63), def
248 * 5 - mono, F destination (FX-bus 0-63), def
249 * 6 - mono, G destination (FX-bus 0-63), def
250 * 7 - mono, H destination (FX-bus 0-63), def
251 * 8 - left, A destination (FX-bus 0-63), def
252 * 9 - left, B destination (FX-bus 0-63), def
253 * 10 - left, C destination (FX-bus 0-63), def
254 * 11 - left, D destination (FX-bus 0-63), def
255 * 12 - left, E destination (FX-bus 0-63), def
256 * 13 - left, F destination (FX-bus 0-63), def
257 * 14 - left, G destination (FX-bus 0-63), def
258 * 15 - left, H destination (FX-bus 0-63), def
259 * 16 - right, A destination (FX-bus 0-63), def
260 * 17 - right, B destination (FX-bus 0-63), def
261 * 18 - right, C destination (FX-bus 0-63), def
262 * 19 - right, D destination (FX-bus 0-63), def
263 * 20 - right, E destination (FX-bus 0-63), def
264 * 21 - right, F destination (FX-bus 0-63), def
265 * 22 - right, G destination (FX-bus 0-63), def
266 * 23 - right, H destination (FX-bus 0-63), def
267
268 Don't forget that it's illegal to assign a cha
269 more than once (it means 0=0 && 1=0 is an inva
270
271 name='EMU10K1 PCM Send Volume',index 0-31
272 -----------------------------------------
273 It specifies the attenuation (amount) for give
274 The channel mapping is following:
275
276 * 0 - mono, A destination attn, default 255
277 * 1 - mono, B destination attn, default 255
278 * 2 - mono, C destination attn, default 0 (m
279 * 3 - mono, D destination attn, default 0 (m
280 * 4 - mono, E destination attn, default 0 (m
281 * 5 - mono, F destination attn, default 0 (m
282 * 6 - mono, G destination attn, default 0 (m
283 * 7 - mono, H destination attn, default 0 (m
284 * 8 - left, A destination attn, default 255
285 * 9 - left, B destination attn, default 0 (m
286 * 10 - left, C destination attn, default 0 (m
287 * 11 - left, D destination attn, default 0 (m
288 * 12 - left, E destination attn, default 0 (m
289 * 13 - left, F destination attn, default 0 (m
290 * 14 - left, G destination attn, default 0 (m
291 * 15 - left, H destination attn, default 0 (m
292 * 16 - right, A destination attn, default 0 (m
293 * 17 - right, B destination attn, default 255
294 * 18 - right, C destination attn, default 0 (m
295 * 19 - right, D destination attn, default 0 (m
296 * 20 - right, E destination attn, default 0 (m
297 * 21 - right, F destination attn, default 0 (m
298 * 22 - right, G destination attn, default 0 (m
299 * 23 - right, H destination attn, default 0 (m
300
301
302
303 MANUALS/PATENTS
304 ===============
305
306 See sb-live-mixer.rst.
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