Resize internal PES buffers dynamically instead of relying on a fixed maximum size.

    size_t payloadSizeBits = br->numBitsLeft();

    CHECK_EQ(payloadSizeBits % 8, 0u);

    CHECK_LE(mBuffer->size() + payloadSizeBits / 8, mBuffer->capacity());

    size_t neededSize = mBuffer->size() + payloadSizeBits / 8;

    if (mBuffer->capacity() < neededSize) {

        // Increment in multiples of 64K.

        neededSize = (neededSize + 65535) & ~65535;

        LOGI("resizing buffer to %d bytes", neededSize);

        sp<ABuffer> newBuffer = new ABuffer(neededSize);

        memcpy(newBuffer->data(), mBuffer->data(), mBuffer->size());

        newBuffer->setRange(0, mBuffer->size());

        mBuffer = newBuffer;

    }

    memcpy(mBuffer->data() + mBuffer->size(), br->data(), payloadSizeBits / 8);

    mBuffer->setRange(0, mBuffer->size() + payloadSizeBits / 8);