1/*
2 * Copyright 2015 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#define LOG_TAG "FifoControllerBase"
18//#define LOG_NDEBUG 0
19#include <utils/Log.h>
20
21#include <stdint.h>
22#include "FifoControllerBase.h"
23
24using namespace android;  // TODO just import names needed
25
26FifoControllerBase::FifoControllerBase(fifo_frames_t capacity, fifo_frames_t threshold)
27        : mCapacity(capacity)
28        , mThreshold(threshold)
29{
30}
31
32FifoControllerBase::~FifoControllerBase() {
33}
34
35fifo_frames_t FifoControllerBase::getFullFramesAvailable() {
36    return (fifo_frames_t) (getWriteCounter() - getReadCounter());
37}
38
39fifo_frames_t FifoControllerBase::getReadIndex() {
40    // % works with non-power of two sizes
41    return (fifo_frames_t) (getReadCounter() % mCapacity);
42}
43
44void FifoControllerBase::advanceReadIndex(fifo_frames_t numFrames) {
45    setReadCounter(getReadCounter() + numFrames);
46}
47
48fifo_frames_t FifoControllerBase::getEmptyFramesAvailable() {
49    return (int32_t)(mThreshold - getFullFramesAvailable());
50}
51
52fifo_frames_t FifoControllerBase::getWriteIndex() {
53    // % works with non-power of two sizes
54    return (fifo_frames_t) (getWriteCounter() % mCapacity);
55}
56
57void FifoControllerBase::advanceWriteIndex(fifo_frames_t numFrames) {
58    setWriteCounter(getWriteCounter() + numFrames);
59}
60
61void FifoControllerBase::setThreshold(fifo_frames_t threshold) {
62    mThreshold = threshold;
63}
64