Merge "Fix rounding error accumulation of audio timestamp"

void AudioSource::queueInputBuffer_l(MediaBuffer *buffer, int64_t timeUs) {

    const size_t bufferSize = buffer->range_length();

    const size_t frameSize = mRecord->frameSize();

    const int64_t timestampUs =

                mPrevSampleTimeUs +

                    ((1000000LL * (bufferSize / frameSize)) +

                        (mSampleRate >> 1)) / mSampleRate;

    if (mNumFramesReceived == 0) {

        buffer->meta_data().setInt64(kKeyAnchorTime, mStartTimeUs);

    }

    mNumFramesReceived += bufferSize / frameSize;

    const int64_t timestampUs =

                mStartTimeUs +

                    ((1000000LL * mNumFramesReceived) +

                        (mSampleRate >> 1)) / mSampleRate;

    buffer->meta_data().setInt64(kKeyTime, mPrevSampleTimeUs);

    buffer->meta_data().setInt64(kKeyDriftTime, timeUs - mInitialReadTimeUs);

    mPrevSampleTimeUs = timestampUs;

    mNumFramesReceived += bufferSize / frameSize;

    mBuffersReceived.push_back(buffer);

    mFrameAvailableCondition.signal();

}