Need help building a working libaudio.so library

[firesnatch]

I was able to compile a working kernel using the instructions I found on this forum. However, i'm having trouble building the files in the hardware folder. In particular, i'm trying to do 'mmm -B hardware/msm7k/libaudio' to get a custom libaudio.so built. Are there any instructions out there?

12/13 UPDATE:

I was able to get it built and working. This is roughly what I did:

Part 1, Get the source

mkdir ~/android-src
cd android-src
repo init -u git://android.git.kernel.org/platform/manifest.git -b android-2.1_r1
repo sync

*Don't* run make

mkdir ~/cliq-src
cd ~/cliq-src
Download all of the Cliq 2.1 source code.  
Uncompress the archives and run the unpack scripts
cp -r * ~/android-src

Part 2, get static library libaudiointerface.a built

Pull the following files from your phone

/system/lib/liba2dp.so
/system/lib/libbinder.so
/system/lib/libhardware_legacy.so
/system/lib/liblog.so
/system/lib/libmedia.so

and put them in

~/android-src/out/target/product/generic/obj/lib

Add these near the top of ~/android-src/frameworks/base/libs/audioflinger/Android.mk

BOARD_HAVE_BLUETOOTH := true
BOARD_USES_GENERIC_AUDIO := false

. build/envsetup.sh
mmm -B frameworks/base/libs/audioflinger

Part 3, Build libaudio

Add these near the top of ~/android-src/hardware/msm7k/libaudio/Android.mk

BOARD_HAVE_BLUETOOTH := true
BOARD_USES_QCOM_7x_CHIPSET := true

Put these defines near the top of ~/android-src/hardware/msm7k/libaudio/AudioHardware.h and AudioPolicyManager.h:

#define DEVICE_OUT_TTY 0x2000
#define MOT_FEATURE_PLATFORM_MSM7K 1

mmm -B hardware/msm7k/libaudio

[fkcoder]

See audioflinger source.

// frameworks/base/libs/audioflinger/AudioHardwareInterface.cpp
 #ifdef GENERIC_AUDIO
     hw = new AudioHardwareGeneric();
 #else
     // if running in emulation - use the emulator driver
     if (property_get("ro.kernel.qemu", value, 0)) {
         LOGD("Running in emulation - using generic audio driver");
         hw = new AudioHardwareGeneric();
     else {
          LOGV("Creating Vendor Specific AudioHardware");
          hw = createAudioHardware();
 #endif
     if (hw->initCheck() != NO_ERROR) {
         LOGW("Using stubbed audio hardware. No sound will be produced.");
         delete hw;
         hw = new AudioHardwareStub();

Change it to create your class, for example

    hw = new AudioHardware();

    if (hw->initCheck() != NO_ERROR) {
        LOGW("Using stubbed audio hardware. No sound will be produced.");
        delete hw;
        hw = new AudioHardwareStub();

[adlx]

Very interesting thanks.

How do you find out the list of libs you need to pull out of the phone and copy to ~/android-src/out/target/product/generic/system/lib?

In the particular case of libaudio.so, I could list the phone's lib dependencies (Cliq with Motoblur build 2.1.5):

libaudio.so depends on all the following libs:

liblog.so
libcutils.so
libutils.so
libmedia.so
libhardware_legacy.so
libdl.so
liba2dp.so
libc.so
libstdc++.so
libm.so

but I can see that list isn't the same as the one you needed to pull from the phone. So there may be another explaination :-)

FYI build your own aosp for backflip 2.1 also has relevant information about the subject.

[firesnatch]

Very interesting thanks.

How do you find out the list of libs you need to pull out of the phone and copy to ~/android-src/out/target/product/generic/system/lib?

[MENTION=3081367]adlx[/MENTION], Before copying the libs, I ran the mmm command to build the library and it would complain about a missing .so. I would then copy over that .so and repeat. The list I posted might be incomplete. I built libaudio.so a few days ago and was going off the date stamps on my files to see which ones I might have copied. Start with my list, and if there are others needed, copy them over one at a time and let me know so I can update my post.

[adlx]

[MENTION=3081367]adlx[/MENTION], Before copying the libs, I ran the mmm command to build the library and it would complain about a missing .so. I would then copy over that .so and repeat. The list I posted might be incomplete. I built libaudio.so a few days ago and was going off the date stamps on my files to see which ones I might have copied. Start with my list, and if there are others needed, copy them over one at a time and let me know so I can update my post.

Thanks for the answer. Before seeing the answer I actually ran the commands (without copying the libs), and I got the 1rst error:


make: *** No rule to make target `out/target/product/generic/obj/lib/liba2dp.so', needed by `out/target/product/generic/obj/SHARED_LIBRARIES/libaudioflinger_intermediates/LINKED/libaudioflinger.so'. Stop.

So, I can see that I am actually following your same steps LOL

Just a correction, in my case at least I had to copy the liba2dp.so to out/target/product/generic/obj/lib/, (obj, not system)

Actually yesterday I saw that same error when issuing a make command, and I didn't know how to solve it. Thanks!

[firesnatch]

Just a correction, in my case at least I had to copy the liba2dp.so to out/target/product/generic/obj/lib/, (obj, not system)

You are right. I'll update my post. I was going off memory, and my memory isn't so good these days

[bestialbub]

for reference, its always possible to find official documentation from an authority.

Audio | Android Open Source

ILLUSTRATES and documents a recommended method for importing/creating your audiolib. disregard if you already have your answer.

the url provided appears to be part of a larger audio library documentation not available on android.com but appears to be available here;

Android - Porting Guide

[cowsquad]

Nice to know this

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