audioflinger中关于audioeffect的问题

2012-04-12 09:51:56 509 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

安卓音效AudioEffect源码剖析1——构造流程当我们写下demo代码： PresetReverb pReverb = new PresetReverb(100, 0); 让我们看看安卓做了什么？ Java层到audioflinger的调用流程： audioflinger service到库的创建流程：【Java层】调用了PresetReverb的构造函数。【Java层】PresetReverb把构造功能甩给了基类Aud 阅读详情

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?

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