Merge "Camera3: Reduce the ZSL queue depth to 4"

#define ATRACE_TAG ATRACE_TAG_CAMERA

//#define LOG_NDEBUG 0

//#define LOG_NNDEBUG 0

#define AVERAGE_PIPELINE_DEPTH 4

#ifdef LOG_NNDEBUG

#define ALOGVV(...) ALOGV(__VA_ARGS__)

    ALOGV("%s: Initialize buffer queue and frame list depth based on max pipeline depth (%d)",

          __FUNCTION__, pipelineMaxDepth);

    // Optimized the buffer queue depth based on the average pipeline depth to reduce memory

    // consumption

    // Need to keep buffer queue longer than metadata queue because sometimes buffer arrives

    // earlier than metadata which causes the buffer corresponding to oldest metadata being

    // removed.

    mFrameListDepth = pipelineMaxDepth;

    mBufferQueueDepth = mFrameListDepth + 1;

    mBufferQueueDepth = AVERAGE_PIPELINE_DEPTH;

    mFrameListDepth = mBufferQueueDepth - 1;

    mZslQueue.insertAt(0, mBufferQueueDepth);