Merge "Replace hard-coded "2" by a constant and comment" into jb-mr1-dev

static const int kPriorityAudioApp = 2;

static const int kPriorityFastMixer = 3;

// IAudioFlinger::createTrack() reports back to client the total size of shared memory area

// for the track.  The client then sub-divides this into smaller buffers for its use.

// Currently the client uses double-buffering by default, but doesn't tell us about that.

// So for now we just assume that client is double-buffered.

// FIXME It would be better for client to tell us whether it wants double-buffering or N-buffering,

// so we could allocate the right amount of memory.

// See the client's minBufCount and mNotificationFramesAct calculations for details.

static const int kFastTrackMultiplier = 2;

// ----------------------------------------------------------------------------

#ifdef ADD_BATTERY_DATA

              (

                (tid != -1) &&

                ((frameCount == 0) ||

                (frameCount >= (int) (mFrameCount * 2))) // * 2 is due to SRC jitter, see below

                (frameCount >= (int) (mFrameCount * kFastTrackMultiplier)))

              )

            ) &&

            // PCM data

        ) {

        // if frameCount not specified, then it defaults to fast mixer (HAL) frame count

        if (frameCount == 0) {

            frameCount = mFrameCount * 2;   // FIXME * 2 is due to SRC jitter, should be computed

            frameCount = mFrameCount * kFastTrackMultiplier;

        }

        ALOGV("AUDIO_OUTPUT_FLAG_FAST accepted: frameCount=%d mFrameCount=%d",

                frameCount, mFrameCount);