audioflinger中关于audioeffect的问题

[hainei_]

HI, 各位好, 没分了, 但是项目很急, 希望大家能多多指点.


现在需要对android中audioeffect的AGC模块作改进, 要作改进, 首先就需要有一个能调到AGC的APK.

问题:

现在有一个JAVA层的APK, 这个APK主要实现创建AudioRecord录音, 并把采集到的PCM数据经过AGC模块增强有用信号.问题出现了, 这个APK在公司的板子上运行, 没有一点效果, 跟踪audioflinger的代码发现, 程序创建AGC成功了, 可是却没调到AGC模块中.
但是把这个APK放到Galaxy Nexus上能明显听到录下来的声音得到增强.


在这里贴上android中audioflinger中一段代码:

void AudioFlinger::EffectChain::process_l()
{
	LOGD("##AudioFlinger::EffectChain::process_l---------------------------\n");
    sp<ThreadBase> thread = mThread.promote();
    if (thread == 0) {
        LOGW("process_l(): cannot promote mixer thread");
        return;
    }
	
    bool isGlobalSession = (mSessionId == AUDIO_SESSION_OUTPUT_MIX) ||
            (mSessionId == AUDIO_SESSION_OUTPUT_STAGE);
    // always process effects unless no more tracks are on the session and the effect tail
    // has been rendered 
    
	LOGD("mSessionId=%d,isGlobalSession=%d, mTailBufferCount=%d, trackCont()=%d,", mSessionId, isGlobalSession, mTailBufferCount, trackCnt());
    bool doProcess = true;
    if (!isGlobalSession) {
        bool tracksOnSession = (trackCnt() != 0);

        if (!tracksOnSession && mTailBufferCount == 0) {
            doProcess = false;
        }
		LOGD("tracksOnSession=%d, mTailBufferCount=%d,", tracksOnSession, mTailBufferCount);

        if (activeTrackCnt() == 0) {
            // if no track is active and the effect tail has not been rendered,
            // the input buffer must be cleared here as the mixer process will not do it
            if (tracksOnSession || mTailBufferCount > 0) {
                size_t numSamples = thread->frameCount() * thread->channelCount();
                memset(mInBuffer, 0, numSamples * sizeof(int16_t));
                if (mTailBufferCount > 0) {
                    mTailBufferCount--;
                }
            }
        }
    }

    size_t size = mEffects.size();

//	doProcess = true;
	LOGD("##AudioFlinger::EffectChain::process_l,size=%d,doProcess=%d,---------------------------\n",size, doProcess);
    if (doProcess) {
        for (size_t i = 0; i < size; i++) {
			LOGD("effect %s,----------------------------------\n", mEffects[i]->mDescriptor.name);
            mEffects[i]->process();
        }
    }
    for (size_t i = 0; i < size; i++) {
        mEffects[i]->updateState();
    }
}

程序如果能调到mEffects[i]->process中, 就应该能调进AGC模块中, 现在LOG出来的信息发现doProcess是0, 程序是调不进去的.


1, 求高人指点, 怎样才能调进AGC模块.


还有, 关于AudioRecord和AudioTrack中sessionID的问题, 这两者的sessionID可以指定成一样的吗?