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-
- Sound Blaster Audigy mixer / default DSP code
- ===========================================
-
-This is based on SB-Live-mixer.txt.
-
-The EMU10K2 chips have a DSP part which can be programmed to support
-various ways of sample processing, which is described here.
-(This article does not deal with the overall functionality of the
-EMU10K2 chips. See the manuals section for further details.)
-
-The ALSA driver programs this portion of chip by default code
-(can be altered later) which offers the following functionality:
-
-
-1) Digital mixer controls
--------------------------
-
-These controls are built using the DSP instructions. They offer extended
-functionality. Only the default build-in code in the ALSA driver is described
-here. Note that the controls work as attenuators: the maximum value is the
-neutral position leaving the signal unchanged. Note that if the same destination
-is mentioned in multiple controls, the signal is accumulated and can be wrapped
-(set to maximal or minimal value without checking of overflow).
-
-
-Explanation of used abbreviations:
-
-DAC - digital to analog converter
-ADC - analog to digital converter
-I2S - one-way three wire serial bus for digital sound by Philips Semiconductors
- (this standard is used for connecting standalone DAC and ADC converters)
-LFE - low frequency effects (subwoofer signal)
-AC97 - a chip containing an analog mixer, DAC and ADC converters
-IEC958 - S/PDIF
-FX-bus - the EMU10K2 chip has an effect bus containing 64 accumulators.
- Each of the synthesizer voices can feed its output to these accumulators
- and the DSP microcontroller can operate with the resulting sum.
-
-name='PCM Front Playback Volume',index=0
-
-This control is used to attenuate samples for left and right front PCM FX-bus
-accumulators. ALSA uses accumulators 8 and 9 for left and right front PCM
-samples for 5.1 playback. The result samples are forwarded to the front DAC PCM
-slots of the Philips DAC.
-
-name='PCM Surround Playback Volume',index=0
-
-This control is used to attenuate samples for left and right surround PCM FX-bus
-accumulators. ALSA uses accumulators 2 and 3 for left and right surround PCM
-samples for 5.1 playback. The result samples are forwarded to the surround DAC PCM
-slots of the Philips DAC.
-
-name='PCM Center Playback Volume',index=0
-
-This control is used to attenuate samples for center PCM FX-bus accumulator.
-ALSA uses accumulator 6 for center PCM sample for 5.1 playback. The result sample
-is forwarded to the center DAC PCM slot of the Philips DAC.
-
-name='PCM LFE Playback Volume',index=0
-
-This control is used to attenuate sample for LFE PCM FX-bus accumulator.
-ALSA uses accumulator 7 for LFE PCM sample for 5.1 playback. The result sample
-is forwarded to the LFE DAC PCM slot of the Philips DAC.
-
-name='PCM Playback Volume',index=0
-
-This control is used to attenuate samples for left and right PCM FX-bus
-accumulators. ALSA uses accumulators 0 and 1 for left and right PCM samples for
-stereo playback. The result samples are forwarded to the front DAC PCM slots
-of the Philips DAC.
-
-name='PCM Capture Volume',index=0
-
-This control is used to attenuate samples for left and right PCM FX-bus
-accumulator. ALSA uses accumulators 0 and 1 for left and right PCM.
-The result is forwarded to the ADC capture FIFO (thus to the standard capture
-PCM device).
-
-name='Music Playback Volume',index=0
-
-This control is used to attenuate samples for left and right MIDI FX-bus
-accumulators. ALSA uses accumulators 4 and 5 for left and right MIDI samples.
-The result samples are forwarded to the front DAC PCM slots of the AC97 codec.
-
-name='Music Capture Volume',index=0
-
-These controls are used to attenuate samples for left and right MIDI FX-bus
-accumulator. ALSA uses accumulators 4 and 5 for left and right PCM.
-The result is forwarded to the ADC capture FIFO (thus to the standard capture
-PCM device).
-
-name='Mic Playback Volume',index=0
-
-This control is used to attenuate samples for left and right Mic input.
-For Mic input is used AC97 codec. The result samples are forwarded to
-the front DAC PCM slots of the Philips DAC. Samples are forwarded to Mic
-capture FIFO (device 1 - 16bit/8KHz mono) too without volume control.
-
-name='Mic Capture Volume',index=0
-
-This control is used to attenuate samples for left and right Mic input.
-The result is forwarded to the ADC capture FIFO (thus to the standard capture
-PCM device).
-
-name='Audigy CD Playback Volume',index=0
-
-This control is used to attenuate samples from left and right IEC958 TTL
-digital inputs (usually used by a CDROM drive). The result samples are
-forwarded to the front DAC PCM slots of the Philips DAC.
-
-name='Audigy CD Capture Volume',index=0
-
-This control is used to attenuate samples from left and right IEC958 TTL
-digital inputs (usually used by a CDROM drive). The result samples are
-forwarded to the ADC capture FIFO (thus to the standard capture PCM device).
-
-name='IEC958 Optical Playback Volume',index=0
-
-This control is used to attenuate samples from left and right IEC958 optical
-digital input. The result samples are forwarded to the front DAC PCM slots
-of the Philips DAC.
-
-name='IEC958 Optical Capture Volume',index=0
-
-This control is used to attenuate samples from left and right IEC958 optical
-digital inputs. The result samples are forwarded to the ADC capture FIFO
-(thus to the standard capture PCM device).
-
-name='Line2 Playback Volume',index=0
-
-This control is used to attenuate samples from left and right I2S ADC
-inputs (on the AudigyDrive). The result samples are forwarded to the front
-DAC PCM slots of the Philips DAC.
-
-name='Line2 Capture Volume',index=1
-
-This control is used to attenuate samples from left and right I2S ADC
-inputs (on the AudigyDrive). The result samples are forwarded to the ADC
-capture FIFO (thus to the standard capture PCM device).
-
-name='Analog Mix Playback Volume',index=0
-
-This control is used to attenuate samples from left and right I2S ADC
-inputs from Philips ADC. The result samples are forwarded to the front
-DAC PCM slots of the Philips DAC. This contains mix from analog sources
-like CD, Line In, Aux, ....
-
-name='Analog Mix Capture Volume',index=1
-
-This control is used to attenuate samples from left and right I2S ADC
-inputs Philips ADC. The result samples are forwarded to the ADC
-capture FIFO (thus to the standard capture PCM device).
-
-name='Aux2 Playback Volume',index=0
-
-This control is used to attenuate samples from left and right I2S ADC
-inputs (on the AudigyDrive). The result samples are forwarded to the front
-DAC PCM slots of the Philips DAC.
-
-name='Aux2 Capture Volume',index=1
-
-This control is used to attenuate samples from left and right I2S ADC
-inputs (on the AudigyDrive). The result samples are forwarded to the ADC
-capture FIFO (thus to the standard capture PCM device).
-
-name='Front Playback Volume',index=0
-
-All stereo signals are mixed together and mirrored to surround, center and LFE.
-This control is used to attenuate samples for left and right front speakers of
-this mix.
-
-name='Surround Playback Volume',index=0
-
-All stereo signals are mixed together and mirrored to surround, center and LFE.
-This control is used to attenuate samples for left and right surround speakers of
-this mix.
-
-name='Center Playback Volume',index=0
-
-All stereo signals are mixed together and mirrored to surround, center and LFE.
-This control is used to attenuate sample for center speaker of this mix.
-
-name='LFE Playback Volume',index=0
-
-All stereo signals are mixed together and mirrored to surround, center and LFE.
-This control is used to attenuate sample for LFE speaker of this mix.
-
-name='Tone Control - Switch',index=0
-
-This control turns the tone control on or off. The samples for front, rear
-and center / LFE outputs are affected.
-
-name='Tone Control - Bass',index=0
-
-This control sets the bass intensity. There is no neutral value!!
-When the tone control code is activated, the samples are always modified.
-The closest value to pure signal is 20.
-
-name='Tone Control - Treble',index=0
-
-This control sets the treble intensity. There is no neutral value!!
-When the tone control code is activated, the samples are always modified.
-The closest value to pure signal is 20.
-
-name='Master Playback Volume',index=0
-
-This control is used to attenuate samples for front, surround, center and
-LFE outputs.
-
-name='IEC958 Optical Raw Playback Switch',index=0
-
-If this switch is on, then the samples for the IEC958 (S/PDIF) digital
-output are taken only from the raw FX8010 PCM, otherwise standard front
-PCM samples are taken.
-
-
-2) PCM stream related controls
-------------------------------
-
-name='EMU10K1 PCM Volume',index 0-31
-
-Channel volume attenuation in range 0-0xffff. The maximum value (no
-attenuation) is default. The channel mapping for three values is
-as follows:
-
- 0 - mono, default 0xffff (no attenuation)
- 1 - left, default 0xffff (no attenuation)
- 2 - right, default 0xffff (no attenuation)
-
-name='EMU10K1 PCM Send Routing',index 0-31
-
-This control specifies the destination - FX-bus accumulators. There 24
-values with this mapping:
-
- 0 - mono, A destination (FX-bus 0-63), default 0
- 1 - mono, B destination (FX-bus 0-63), default 1
- 2 - mono, C destination (FX-bus 0-63), default 2
- 3 - mono, D destination (FX-bus 0-63), default 3
- 4 - mono, E destination (FX-bus 0-63), default 0
- 5 - mono, F destination (FX-bus 0-63), default 0
- 6 - mono, G destination (FX-bus 0-63), default 0
- 7 - mono, H destination (FX-bus 0-63), default 0
- 8 - left, A destination (FX-bus 0-63), default 0
- 9 - left, B destination (FX-bus 0-63), default 1
- 10 - left, C destination (FX-bus 0-63), default 2
- 11 - left, D destination (FX-bus 0-63), default 3
- 12 - left, E destination (FX-bus 0-63), default 0
- 13 - left, F destination (FX-bus 0-63), default 0
- 14 - left, G destination (FX-bus 0-63), default 0
- 15 - left, H destination (FX-bus 0-63), default 0
- 16 - right, A destination (FX-bus 0-63), default 0
- 17 - right, B destination (FX-bus 0-63), default 1
- 18 - right, C destination (FX-bus 0-63), default 2
- 19 - right, D destination (FX-bus 0-63), default 3
- 20 - right, E destination (FX-bus 0-63), default 0
- 21 - right, F destination (FX-bus 0-63), default 0
- 22 - right, G destination (FX-bus 0-63), default 0
- 23 - right, H destination (FX-bus 0-63), default 0
-
-Don't forget that it's illegal to assign a channel to the same FX-bus accumulator
-more than once (it means 0=0 && 1=0 is an invalid combination).
-
-name='EMU10K1 PCM Send Volume',index 0-31
-
-It specifies the attenuation (amount) for given destination in range 0-255.
-The channel mapping is following:
-
- 0 - mono, A destination attn, default 255 (no attenuation)
- 1 - mono, B destination attn, default 255 (no attenuation)
- 2 - mono, C destination attn, default 0 (mute)
- 3 - mono, D destination attn, default 0 (mute)
- 4 - mono, E destination attn, default 0 (mute)
- 5 - mono, F destination attn, default 0 (mute)
- 6 - mono, G destination attn, default 0 (mute)
- 7 - mono, H destination attn, default 0 (mute)
- 8 - left, A destination attn, default 255 (no attenuation)
- 9 - left, B destination attn, default 0 (mute)
- 10 - left, C destination attn, default 0 (mute)
- 11 - left, D destination attn, default 0 (mute)
- 12 - left, E destination attn, default 0 (mute)
- 13 - left, F destination attn, default 0 (mute)
- 14 - left, G destination attn, default 0 (mute)
- 15 - left, H destination attn, default 0 (mute)
- 16 - right, A destination attn, default 0 (mute)
- 17 - right, B destination attn, default 255 (no attenuation)
- 18 - right, C destination attn, default 0 (mute)
- 19 - right, D destination attn, default 0 (mute)
- 20 - right, E destination attn, default 0 (mute)
- 21 - right, F destination attn, default 0 (mute)
- 22 - right, G destination attn, default 0 (mute)
- 23 - right, H destination attn, default 0 (mute)
-
-
-
-4) MANUALS/PATENTS:
--------------------
-
-ftp://opensource.creative.com/pub/doc
--------------------------------------
-
- Files:
- LM4545.pdf AC97 Codec
-
- m2049.pdf The EMU10K1 Digital Audio Processor
-
- hog63.ps FX8010 - A DSP Chip Architecture for Audio Effects
-
-
-WIPO Patents
-------------
- Patent numbers:
- WO 9901813 (A1) Audio Effects Processor with multiple asynchronous (Jan. 14, 1999)
- streams
-
- WO 9901814 (A1) Processor with Instruction Set for Audio Effects (Jan. 14, 1999)
-
- WO 9901953 (A1) Audio Effects Processor having Decoupled Instruction
- Execution and Audio Data Sequencing (Jan. 14, 1999)
-
-
-US Patents (http://www.uspto.gov/)
-----------------------------------
-
- US 5925841 Digital Sampling Instrument employing cache memory (Jul. 20, 1999)
-
- US 5928342 Audio Effects Processor integrated on a single chip (Jul. 27, 1999)
- with a multiport memory onto which multiple asynchronous
- digital sound samples can be concurrently loaded
-
- US 5930158 Processor with Instruction Set for Audio Effects (Jul. 27, 1999)
-
- US 6032235 Memory initialization circuit (Tram) (Feb. 29, 2000)
-
- US 6138207 Interpolation looping of audio samples in cache connected to (Oct. 24, 2000)
- system bus with prioritization and modification of bus transfers
- in accordance with loop ends and minimum block sizes
-
- US 6151670 Method for conserving memory storage using a (Nov. 21, 2000)
- pool of short term memory registers
-
- US 6195715 Interrupt control for multiple programs communicating with (Feb. 27, 2001)
- a common interrupt by associating programs to GP registers,
- defining interrupt register, polling GP registers, and invoking
- callback routine associated with defined interrupt register