1/*
2 * Copyright (C) 2012 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 "Pipe"
18//#define LOG_NDEBUG 0
19
20#include <cutils/atomic.h>
21#include <cutils/compiler.h>
22#include <utils/Log.h>
23#include <media/nbaio/Pipe.h>
24#include <audio_utils/roundup.h>
25
26namespace android {
27
28Pipe::Pipe(size_t maxFrames, const NBAIO_Format& format, void *buffer) :
29        NBAIO_Sink(format),
30        // TODO fifo now supports non-power-of-2 buffer sizes, so could remove the roundup
31        mMaxFrames(roundup(maxFrames)),
32        mBuffer(buffer == NULL ? malloc(mMaxFrames * Format_frameSize(format)) : buffer),
33        mFifo(mMaxFrames, Format_frameSize(format), mBuffer, false /*throttlesWriter*/),
34        mFifoWriter(mFifo),
35        mReaders(0),
36        mFreeBufferInDestructor(buffer == NULL)
37{
38}
39
40Pipe::~Pipe()
41{
42    ALOG_ASSERT(android_atomic_acquire_load(&mReaders) == 0);
43    if (mFreeBufferInDestructor) {
44        free(mBuffer);
45    }
46}
47
48ssize_t Pipe::write(const void *buffer, size_t count)
49{
50    // count == 0 is unlikely and not worth checking for
51    if (CC_UNLIKELY(!mNegotiated)) {
52        return NEGOTIATE;
53    }
54    ssize_t actual = mFifoWriter.write(buffer, count);
55    ALOG_ASSERT(actual <= count);
56    if (actual <= 0) {
57        return actual;
58    }
59    mFramesWritten += (size_t) actual;
60    return actual;
61}
62
63}   // namespace android
64