ALSA在ARM(S3C6410)中的移植
软硬件平台：ARM9（S3C2410A），UDA1341, 2.6.33.1内核，arm-none-linux-gnueabi-gcc-4.3.2
ASoC:
ALSA为嵌入式系统提供的SOC级驱动，支持PCM，I2S和AC97。
详细内容可查阅：
http://www.alsa-project.org/main/index.php/ASoC
（1）驱动移植
2.6.33.1已经为提供了UDA134X的ALSA驱动，只需要稍微配置即可。
在arch/arm/mach-s3c2410/mach-smdk2410.c中添加：
static struct s3c24xx_uda134x_platform_data s3c24xx_uda134x_data = {
.l3_clk = S3C2410_GPB(4),
.l3_data = S3C2410_GPB(3),
.l3_mode = S3C2410_GPB(2),
.model = UDA134X_UDA1341,
};
.l3_clk = S3C2410_GPB(4),
.l3_data = S3C2410_GPB(3),
.l3_mode = S3C2410_GPB(2),
.model = UDA134X_UDA1341,
};
static struct platform_device s3c24xx_uda134x = {
.name = "s3c24xx_uda134x",
.dev = {
.platform_data = &s3c24xx_uda134x_data,
}
};
.name = "s3c24xx_uda134x",
.dev = {
.platform_data = &s3c24xx_uda134x_data,
}
};
在smdk2410_devices[]添加一项：&s3c24xx_uda134x
配置内核选项，选中ALSA支持。
更新内核，启动显示
usbcore: registered new interface driver usbhid
usbhid: USB HID core driver
usbcore: registered new interface driver snd-usb-audio
usbcore: registered new interface driver snd-usb-caiaq
No device for DAI UDA134X
No device for DAI s3c24xx-i2s
S3C24XX_UDA134X SoC Audio driver
UDA134X SoC Audio Codec
asoc: UDA134X <-> s3c24xx-i2s mapping ok
usb 1-1: new full speed USB device using s3c2410-ohci and address 2
ALSA device list:
#0: S3C24XX_UDA134X (UDA134X)
usbhid: USB HID core driver
usbcore: registered new interface driver snd-usb-audio
usbcore: registered new interface driver snd-usb-caiaq
No device for DAI UDA134X
No device for DAI s3c24xx-i2s
S3C24XX_UDA134X SoC Audio driver
UDA134X SoC Audio Codec
asoc: UDA134X <-> s3c24xx-i2s mapping ok
usb 1-1: new full speed USB device using s3c2410-ohci and address 2
ALSA device list:
#0: S3C24XX_UDA134X (UDA134X)
驱动移植成功。可以支持板子的UDA1341，可支持我的usb声卡了。
（此处也可以直接使用alsa-driver提供驱动程序，具体我没有做）
（2）alsa-lib移植
版本alsa-lib-1.0.22
./configure --host=arm-linux --target=arm-linux
--prefix=/usr/local/arm/4.3.2/arm-none-linux-gnueabi/libc/usr --enable-static --enable-shared --disable-python --with-configdir=/usr/local/share --with-plugindir=/usr/local/lib/alsa_lib
编译安装，将库文件、配置文件和插件文件转移到嵌入式文件系统的对应目录上。
（3）alsa-utils移植
版本alsa-utils-1.0.23
PKG_CONFIG_PATH="/usr/local/arm/4.3.2/arm-none-linux-gnueabi/libc/usr/lib/pkgconfig" LDFLAGS="-L/usr/local/arm/4.3.2/arm-none-linux-gnueabi/libc/armv4t/usr/lib -lpthread -lc -lgcc" CFLAGS="-I/usr/local/arm/4.3.2/arm-none-linux-gnueabi/libc/armv4t/usr/include" ./configure --host=arm-linux --target=arm-linux --prefix=/home/gyh/mybook/alsa-utils-prefix --disable-alsamixer --with-alsa-prefix=/usr/local/arm/4.3.2/arm-none-linux-gnueabi/libc/usr/lib/ --with-alsa-inc-prefix=/usr/local/arm/4.3.2/arm-none-linux-gnueabi/libc/usr/include/
将/home/gyh/mybook/alsa-utils-prefix目录拷贝到嵌入式文件系统的对应目录上。
（4）alsa配置
在启动脚本中添加：（可能您的不需要）
/bin/mkdir /dev/snd
/bin/ln -s /dev/pcmC0D0c /dev/snd/pcmC0D0c
/bin/ln -s /dev/pcmC0D0p /dev/snd/pcmC0D0p
/bin/ln -s /dev/controlC0 /dev/snd/controlC0
/bin/ln -s /dev/pcmC1D0c /dev/snd/pcmC1D0c
/bin/ln -s /dev/pcmC1D0p /dev/snd/pcmC1D0p
/bin/ln -s /dev/controlC1 /dev/snd/controlC1
/bin/ln -s /dev/seq /dev/snd/seq
/bin/ln -s /dev/timer /dev/snd/timer
/bin/ln -s /dev/pcmC0D0c /dev/snd/pcmC0D0c
/bin/ln -s /dev/pcmC0D0p /dev/snd/pcmC0D0p
/bin/ln -s /dev/controlC0 /dev/snd/controlC0
/bin/ln -s /dev/pcmC1D0c /dev/snd/pcmC1D0c
/bin/ln -s /dev/pcmC1D0p /dev/snd/pcmC1D0p
/bin/ln -s /dev/controlC1 /dev/snd/controlC1
/bin/ln -s /dev/seq /dev/snd/seq
/bin/ln -s /dev/timer /dev/snd/timer
modprobe.conf文件内容为
#for ALSA
alias char-major-116 snd
alias char-major-116 snd
options snd cards_limit=2
alias snd-card-0 snd-soc-uda134x #换成您自己的
alias snd-card-1 snd-usb-audio
alias snd-card-0 snd-soc-uda134x #换成您自己的
alias snd-card-1 snd-usb-audio
#for OSS
alias char-major-14 soundcore
alias sound-slot-0 snd-card-0
alias char-major-14 soundcore
alias sound-slot-0 snd-card-0
#OSS Emulation by ALSA
alias sound-service-0-0 snd-mixer-oss
alias sound-service-0-1 snd-seq-oss
alias sound-service-0-3 snd-pcm-oss
alias sound-service-0-8 snd-seq-oss
alias sound-service-0-12 snd-pcm-oss
alias sound-service-0-0 snd-mixer-oss
alias sound-service-0-1 snd-seq-oss
alias sound-service-0-3 snd-pcm-oss
alias sound-service-0-8 snd-seq-oss
alias sound-service-0-12 snd-pcm-oss
alias sound-slot-1 snd-card-1
alias sound-service-1-0 snd-mixer-oss
alias sound-service-1-1 snd-seq-oss
alias sound-service-1-3 snd-pcm-oss
alias sound-service-1-8 snd-seq-oss
alias sound-service-1-12 snd-pcm-oss
alias sound-service-1-1 snd-seq-oss
alias sound-service-1-3 snd-pcm-oss
alias sound-service-1-8 snd-seq-oss
alias sound-service-1-12 snd-pcm-oss
options snd-soc-uda134x index=0
options snd-usb-audio index=1
options snd-usb-audio index=1
asound.conf里内容为
# asoc:uda134x
pcm.!dmix {
type dmix
ipc_key 5678293
ipc_key_add_uid yes
slave {
pcm "hw:0,0"
period_time 0
period_size 2048
buffer_size 16384
format S16_LE
rate 48000
}
}
pcm.!dsnoop {
type dsnoop
ipc_key 5778293
ipc_key_add_uid yes
slave {
pcm "hw:0,0"
period_time 0
period_size 2048
buffer_size 16384
format S16_LE
rate 48000
}
}
pcm.asymed {
type asym
playback.pcm "dmix"
capture.pcm "dsnoop"
}
pcm.!default {
type plug
slave.pcm "asymed"
}
pcm.dsp0 {
type plug
slave.pcm "asymed"
}
ctl.mixer0 {
type hw
card 0
}
pcm.!dmix {
type dmix
ipc_key 5678293
ipc_key_add_uid yes
slave {
pcm "hw:0,0"
period_time 0
period_size 2048
buffer_size 16384
format S16_LE
rate 48000
}
}
pcm.!dsnoop {
type dsnoop
ipc_key 5778293
ipc_key_add_uid yes
slave {
pcm "hw:0,0"
period_time 0
period_size 2048
buffer_size 16384
format S16_LE
rate 48000
}
}
pcm.asymed {
type asym
playback.pcm "dmix"
capture.pcm "dsnoop"
}
pcm.!default {
type plug
slave.pcm "asymed"
}
pcm.dsp0 {
type plug
slave.pcm "asymed"
}
ctl.mixer0 {
type hw
card 0
}
（5）测试放音和录音
./aplay try.wav &
显示Playing WAVE 'try.wav' : Signed 16 bit Little .....
听到音乐了。
./arecord -t wav -f dat myrecord.wav
显示mapped channel 9 to 1
Recording WAVE 'myrecord.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Steo
对着麦克风说话，ctrl+C停止
对着麦克风说话，ctrl+C停止
./aplay myrecord.wav听到刚才说的话。
设置音量
./amixer set Master 50%
./amixer set Capture 50%
./alsactl store -f asound.state
在开机启动脚本中增加脚本使每次开机恢复设置，我增加的脚本如下：
/home/gyh/mybook/alsa-utils-prefix/sbin/alsactl restore -f /home/gyh/mybook/alsa-utils-prefix/sbin/asound.state
（6）mplayer移植
版本mplayer-export-2010-05-13
建立build-arm.sh文件，内容为
#!/bin/sh
./configure --cc=arm-linux-gcc \
--host-cc=gcc \
--enable-cross-compile \
--target=arm- armv6-linux \
--prefix=/home/gyh/mybook/mplayer \
--ar=arm-linux-ar \
--nm=arm-linux-nm \
--ranlib=arm-linux-ranlib \
--enable-linux-devfs \
--disable-dvdread \
--enable-fbdev \
--disable-mencoder \
--disable-liba52 \
--enable-libavcodec_so \
--disable-libmpeg2 \
--disable-mp3lib \
--enable-alsa \
--disable-ossaudio \
--disable-w32threads \
--disable-win32dll \
--disable-win32waveout \
--disable-live 2>&1 | tee logfile
--host-cc=gcc \
--enable-cross-compile \
--target=arm- armv6-linux \
--prefix=/home/gyh/mybook/mplayer \
--ar=arm-linux-ar \
--nm=arm-linux-nm \
--ranlib=arm-linux-ranlib \
--enable-linux-devfs \
--disable-dvdread \
--enable-fbdev \
--disable-mencoder \
--disable-liba52 \
--enable-libavcodec_so \
--disable-libmpeg2 \
--disable-mp3lib \
--enable-alsa \
--disable-ossaudio \
--disable-w32threads \
--disable-win32dll \
--disable-win32waveout \
--disable-live 2>&1 | tee logfile
执行./build-arm.sh
make
复制mplayer至嵌入式文件系统内
执行：./mplayer /home/gyh/Documents/Legend.mp3
显示如下：
MPlayer SVN-r31170-snapshot-4.3.2 (C) 2000-2010 MPlayer Team
Playing /home/gyh/Documents/Legend.mp3.
Audio only file format detected.
Clip info:
Title: Legend
Artist: wangfei
Album:
Year:
Comment: wangfei
Genre: Other
==========================================================================
Requested audio codec family [mp3] (afm=mp3lib) not available.
Enable it at compilation.
Opening audio decoder: [ffmpeg] FFmpeg/libavcodec audio decoders
AUDIO: 48000 Hz, 2 ch, s16le, 320.0 kbit/20.83% (ratio: 40000->192000)
Selected audio codec: [ffmp3] afm: ffmpeg (FFmpeg MPEG layer-3 audio)
==========================================================================
AO: [alsa] 48000Hz 2ch s16le (2 bytes per sample)
Video: no video
Starting playback...
Audio only file format detected.
Clip info:
Title: Legend
Artist: wangfei
Album:
Year:
Comment: wangfei
Genre: Other
==========================================================================
Requested audio codec family [mp3] (afm=mp3lib) not available.
Enable it at compilation.
Opening audio decoder: [ffmpeg] FFmpeg/libavcodec audio decoders
AUDIO: 48000 Hz, 2 ch, s16le, 320.0 kbit/20.83% (ratio: 40000->192000)
Selected audio codec: [ffmp3] afm: ffmpeg (FFmpeg MPEG layer-3 audio)
==========================================================================
AO: [alsa] 48000Hz 2ch s16le (2 bytes per sample)
Video: no video
Starting playback...
听到这首悦耳的《传奇》，心情真好，嘿嘿
（7）Qt-extended-4.4.3的alsa移植
export PKG_CONFIG_PATH=/usr/local/arm/4.3.2/arm-none-linux-gnueabi/libc/usr/lib/pkgconfig/
../qt-extended-4.4.3/configure -release -xplatform linux-arm-g++ -arch arm -displaysizes 240x320 -build-qt -extra-qt-embedded-config "-xplatform qws/linux-arm-g++ -embedded arm -qconfig qpe -shared -little-endian -webkit -qt-kbd-usb -qt-libpng -qt-libjpeg -qt-gif -depths 16 -qt-mouse-tslib -I/home/gyh/backup/tslib1.4/include -L/home/gyh/backup/tslib1.4/lib" -verbose -mediaengines cruxus -dbus -ssl -sound-system alsa
bin/qbuild && bin/qbuild image
复制到我的SD卡上，能播放wav格式的音乐了，不过声音短短续续的，还望各位前辈指教。
添加libmad以支持mp3，试验用，先不考虑版权了，呵呵
可以播放mp3了，不过仍然断断续续的，几经研究未果，有人说是内核版本问题，换到低版本问题依旧，看来不是，aplay和mplayer都正常，初步判断是qt-extended的BUG，还望各位大师指教啊。
=======================================================================================
PS1:我的三星I6410 M1 CPU用的是S3C6410.编译MPlayer时注意target应该为arm-armv6-linux,切记，编译ALSA-LIB的时候，--prefix路径为所对应编译器的的目录，如这里选择的是：
--prefix=/usr/local/arm/4.3.2/arm-none-linux-gnueabi/libc/usr
否则的话，在配置mplayer的过程会出现：Checking for ALSA audio ... no
的提示，估计出现这个提示的人不多，因为网上找到关于这个提示的非常少，我也是偶然的机会悟出来的，开头我一直纳闷，怎么让编译器找得到alsa-lib呢，因为这个lib三星的SDK已经提供了，所以并不需要重新编译一次，只需找到头文件和库放到响应的位置就行了！不过，手机上那个终端是别人搞的，貌似有点问题，不管了，抽空搞个GTK 的GUI 应该就没有问题了。总之困扰多时的mplayer alsa 问题终于解决了，心情舒畅了不少，mplayer -ao help，终于看到盼望已久的alsa啦。
PS2:建议使用4.2.2-eabi-LiMo-0.1.tar.gz交叉工具链，为啥呢，因为这个编译器它里面包含了几乎所有的库，个人觉得应该不是三星官方发布的，应当也是爱好者发布的好东西。编译mplayer，那简直就是不费吹灰之力，设定环境变量，configure一下，make，make install 就完事了。具体下载地址GOOGLE搜索吧。