Merge "Transcoder: Fix crash in PassthroughTrackTranscoder"

    // Check if the free list contains a large enough buffer.

    auto it = mFreeBufferMap.lower_bound(minimumBufferSize);

    if (it != mFreeBufferMap.end()) {

        uint8_t* buffer = it->second;

        mFreeBufferMap.erase(it);

        return it->second;

    }

    // Allocate a new buffer.

    uint8_t* buffer = new (std::nothrow) uint8_t[minimumBufferSize];

    if (buffer == nullptr) {

        LOG(ERROR) << "Unable to allocate new buffer of size: " << minimumBufferSize;

        return nullptr;

        return buffer;

    }

    // If the maximum buffer count is reached, remove an existing free buffer.

    if (mAddressSizeMap.size() >= mMaxBufferCount) {

        auto it = mFreeBufferMap.begin();

        mFreeBufferMap.erase(it);

        mAddressSizeMap.erase(it->second);

        delete[] it->second;

        mFreeBufferMap.erase(it);

    }

    // Allocate a new buffer.

    uint8_t* buffer = new (std::nothrow) uint8_t[minimumBufferSize];

    if (buffer == nullptr) {

        LOG(ERROR) << "Unable to allocate new buffer of size: " << minimumBufferSize;

        return nullptr;

    }

    // Add the buffer to the tracking set.