MobileRead Forums - View Single Post - Audio (video) - Kindle. Getting it up and running, Code level.

twobob · 07-02-2012, 09:49 AM

Borrowed from Lupines:
https://www.mobileread.com/forums/sho...d.php?t=204275

Now, if you are REALLY brave and want to compile it from scratch
here are the instructions on how to build it from source.

INSTRUCTIONS FOR THE CROSS COMPILER

cross compiler instructions for ARM from here:
http://wiki.debian.org/BuildingCross...Cross_Compiler

----------------------------------------------------------

COMPILING INSTRUCTIONS FOR alsa-lib

Since the Kindle works under ALSA for audio, you must have a cross compiled
version of alsa-lib-1.0.13. I believe a newer version of the ALSA libs
could be used. I just tried this one and it works (Other than an init lag, which seems to affect all version of alsa with this card)

# wget http://gd.tuwien.ac.at/opsys/linux/a...1.0.13.tar.bz2

# bunzip2 alsa-lib-1.0.13.tar.bz2 ; tar -xvf alsa-lib-1.0.13.tar

# cd alsa-lib-1.0.13

# ./configure --with-audio=alsa --prefix=/usr/local/arm-linux --host=arm-linux CC=arm-linux-gnueabi-gcc \
GCC=arm-linux-gnueabi-g++ CFLAGS=-DEMBEDDED CFLAGS="-I/usr/local/arm-linux/include" \
LDFLAGS="-L/usr/local/arm-linux/lib" LD_LIBRARY_PATH="/usr/local/arm-linux/lib"

# make

# make install

-------------------------------------------------
Notes about the card

For the interested: cat /proc/asound/cards

Spoiler:

So its an Alsa-sound installation with some interesting bits and bats of settable params.

Specifically: Access to some basic 3D audio emulation and potentially some filtering
(By all accounts this often does nothing)

Automated Volume leveling and some fancy ADSR enums around it
Also uses some sort of target function which looks intriguing
(which could serve as a compressor limiter expander possibly mis-used correctly)

Settings for ADC / DAC inversion with single side inversion
(that may allow for phase effect tricks such as cancellation to be done without code)
Mic Boost is included which may actually come in handy. no doubt horrible.

A mono volume-joined noise gate - which is a nice bonus.

If anyone has any experience with these on the kindle wade in here.
The last time I played with this stuff was a decade ago.

Looks like there are some ways to make what is there do some cool stuff with a bit of thought.
would be nice to have something that provide for direct DSP pumping in place.

http://tldp.org/HOWTO/Alsa-sound-6.html has a run down of much of info I have re-covered here.

the alsamixer and alsactl apps are also present. as yet untested them. Assuming the alsamixer operates "as well" as it does on my main Slackware system: It will be flaky and have odd muting behavior. Have to see.

Comforting to find an alsa setup under the hood.

07-02-2012, 09:49 AM	#2
twobob ( ͡° ͜ʖ ͡°){ʇlnɐɟ ƃǝs}Týr Posts: 6,586 Karma: 6299991 Join Date: Jun 2012 Location: uti gratia usura (Yao ying da ying; Mo ying da yieng) Device: PW-WIFI\|K5-3G+WIFI\| K4\|K3-3G\|DXG\|K2\| Rooted Nook Touch	Borrowed from Lupines: https://www.mobileread.com/forums/sho...d.php?t=204275 Now, if you are REALLY brave and want to compile it from scratch here are the instructions on how to build it from source. INSTRUCTIONS FOR THE CROSS COMPILER cross compiler instructions for ARM from here: http://wiki.debian.org/BuildingCross...Cross_Compiler ---------------------------------------------------------- COMPILING INSTRUCTIONS FOR alsa-lib Since the Kindle works under ALSA for audio, you must have a cross compiled version of alsa-lib-1.0.13. I believe a newer version of the ALSA libs could be used. I just tried this one and it works (Other than an init lag, which seems to affect all version of alsa with this card) # wget http://gd.tuwien.ac.at/opsys/linux/a...1.0.13.tar.bz2 # bunzip2 alsa-lib-1.0.13.tar.bz2 ; tar -xvf alsa-lib-1.0.13.tar # cd alsa-lib-1.0.13 # ./configure --with-audio=alsa --prefix=/usr/local/arm-linux --host=arm-linux CC=arm-linux-gnueabi-gcc \ GCC=arm-linux-gnueabi-g++ CFLAGS=-DEMBEDDED CFLAGS="-I/usr/local/arm-linux/include" \ LDFLAGS="-L/usr/local/arm-linux/lib" LD_LIBRARY_PATH="/usr/local/arm-linux/lib" # make # make install ------------------------------------------------- Notes about the card For the interested: cat /proc/asound/cards Spoiler: [root@kindle /dev]# cat /proc/asound/cards 0 [mx35luigi ]: WM8960 - mx35luigi mx35luigi (WM8960) [root@kindle /dev]# amixer Simple mixer control 'Headphone',0 Capabilities: pvolume Playback channels: Front Left - Front Right Limits: Playback 0 - 127 Mono: Front Left: Playback 0 [0%] Front Right: Playback 16 [13%] ...ELIDED... repeated later in threads So its an Alsa-sound installation with some interesting bits and bats of settable params. Specifically: Access to some basic 3D audio emulation and potentially some filtering (By all accounts this often does nothing) Automated Volume leveling and some fancy ADSR enums around it Also uses some sort of target function which looks intriguing (which could serve as a compressor limiter expander possibly mis-used correctly) Settings for ADC / DAC inversion with single side inversion (that may allow for phase effect tricks such as cancellation to be done without code) Mic Boost is included which may actually come in handy. no doubt horrible. A mono volume-joined noise gate - which is a nice bonus. If anyone has any experience with these on the kindle wade in here. The last time I played with this stuff was a decade ago. Looks like there are some ways to make what is there do some cool stuff with a bit of thought. would be nice to have something that provide for direct DSP pumping in place. http://tldp.org/HOWTO/Alsa-sound-6.html has a run down of much of info I have re-covered here. the alsamixer and alsactl apps are also present. as yet untested them. Assuming the alsamixer operates "as well" as it does on my main Slackware system: It will be flaky and have odd muting behavior. Have to see. Comforting to find an alsa setup under the hood. Last edited by twobob; 01-30-2013 at 08:17 AM. Reason: Legibility and some notes about alsa.