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t/samples/android-framework/android-5.1.1_r38/AudioTrackShared.cpp  view on Meta::CPAN

    }
    // As mFramesReady is the total remaining frames in the static audio track,
    // it is always larger or equal to avail.
    LOG_ALWAYS_FATAL_IF(mFramesReady < avail);
    buffer->mNonContig = mFramesReady == INT64_MAX ? SIZE_MAX : clampToSize(mFramesReady - avail);
    mUnreleased = avail;
    return NO_ERROR;
}

void StaticAudioTrackServerProxy::releaseBuffer(Buffer* buffer)
{
    size_t stepCount = buffer->mFrameCount;
    LOG_ALWAYS_FATAL_IF(!(stepCount <= mFramesReady));
    LOG_ALWAYS_FATAL_IF(!(stepCount <= mUnreleased));
    if (stepCount == 0) {
        // prevent accidental re-use of buffer
        buffer->mRaw = NULL;
        buffer->mNonContig = 0;
        return;
    }
    mUnreleased -= stepCount;
    audio_track_cblk_t* cblk = mCblk;
    size_t position = mPosition;
    size_t newPosition = position + stepCount;
    int32_t setFlags = 0;
    if (!(position <= newPosition && newPosition <= mFrameCount)) {
        ALOGW("%s newPosition %zu outside [%zu, %zu]", __func__, newPosition, position, mFrameCount);
        newPosition = mFrameCount;
    } else if (mState.mLoopCount != 0 && newPosition == mState.mLoopEnd) {
        newPosition = mState.mLoopStart;
        if (mState.mLoopCount == -1 || --mState.mLoopCount != 0) {
            setFlags = CBLK_LOOP_CYCLE;
        } else {
            setFlags = CBLK_LOOP_FINAL;
        }
    }
    if (newPosition == mFrameCount) {
        setFlags |= CBLK_BUFFER_END;
    }
    mPosition = newPosition;
    if (mFramesReady != INT64_MAX) {
        mFramesReady -= stepCount;
    }
    mFramesReadySafe = clampToSize(mFramesReady);

    cblk->mServer += stepCount;
    // This may overflow, but client is not supposed to rely on it
    cblk->u.mStatic.mBufferPosition = (uint32_t) newPosition;
    if (setFlags != 0) {
        (void) android_atomic_or(setFlags, &cblk->mFlags);
        // this would be a good place to wake a futex
    }

    buffer->mFrameCount = 0;
    buffer->mRaw = NULL;
    buffer->mNonContig = 0;
}

void StaticAudioTrackServerProxy::tallyUnderrunFrames(uint32_t frameCount __unused)
{
    // Unlike AudioTrackServerProxy::tallyUnderrunFrames() used for streaming tracks,
    // we don't have a location to count underrun frames.  The underrun frame counter
    // only exists in AudioTrackSharedStreaming.  Fortunately, underruns are not
    // possible for static buffer tracks other than at end of buffer, so this is not a loss.

    // FIXME also wake futex so that underrun is noticed more quickly
    (void) android_atomic_or(CBLK_UNDERRUN, &mCblk->mFlags);
}

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

}   // namespace android