1/*
2 * Copyright (C) 2013 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_NDEBUG 0
18#define LOG_TAG "MediaAdapter"
19#include <utils/Log.h>
20
21#include <media/stagefright/foundation/ADebug.h>
22#include <media/stagefright/MediaAdapter.h>
23#include <media/stagefright/MediaBuffer.h>
24
25namespace android {
26
27MediaAdapter::MediaAdapter(const sp<MetaData> &meta)
28    : mCurrentMediaBuffer(NULL),
29      mStarted(false),
30      mOutputFormat(meta) {
31}
32
33MediaAdapter::~MediaAdapter() {
34    Mutex::Autolock autoLock(mAdapterLock);
35    mOutputFormat.clear();
36    CHECK(mCurrentMediaBuffer == NULL);
37}
38
39status_t MediaAdapter::start(MetaData * /* params */) {
40    Mutex::Autolock autoLock(mAdapterLock);
41    if (!mStarted) {
42        mStarted = true;
43    }
44    return OK;
45}
46
47status_t MediaAdapter::stop() {
48    Mutex::Autolock autoLock(mAdapterLock);
49    if (mStarted) {
50        mStarted = false;
51        // If stop() happens immediately after a pushBuffer(), we should
52        // clean up the mCurrentMediaBuffer
53        if (mCurrentMediaBuffer != NULL) {
54            mCurrentMediaBuffer->release();
55            mCurrentMediaBuffer = NULL;
56        }
57        // While read() is still waiting, we should signal it to finish.
58        mBufferReadCond.signal();
59    }
60    return OK;
61}
62
63sp<MetaData> MediaAdapter::getFormat() {
64    Mutex::Autolock autoLock(mAdapterLock);
65    return mOutputFormat;
66}
67
68void MediaAdapter::signalBufferReturned(MediaBuffer *buffer) {
69    Mutex::Autolock autoLock(mAdapterLock);
70    CHECK(buffer != NULL);
71    buffer->setObserver(0);
72    buffer->release();
73    ALOGV("buffer returned %p", buffer);
74    mBufferReturnedCond.signal();
75}
76
77status_t MediaAdapter::read(
78            MediaBuffer **buffer, const ReadOptions * /* options */) {
79    Mutex::Autolock autoLock(mAdapterLock);
80    if (!mStarted) {
81        ALOGV("Read before even started!");
82        return ERROR_END_OF_STREAM;
83    }
84
85    while (mCurrentMediaBuffer == NULL && mStarted) {
86        ALOGV("waiting @ read()");
87        mBufferReadCond.wait(mAdapterLock);
88    }
89
90    if (!mStarted) {
91        ALOGV("read interrupted after stop");
92        CHECK(mCurrentMediaBuffer == NULL);
93        return ERROR_END_OF_STREAM;
94    }
95
96    CHECK(mCurrentMediaBuffer != NULL);
97
98    *buffer = mCurrentMediaBuffer;
99    mCurrentMediaBuffer = NULL;
100    (*buffer)->setObserver(this);
101
102    return OK;
103}
104
105status_t MediaAdapter::pushBuffer(MediaBuffer *buffer) {
106    if (buffer == NULL) {
107        ALOGE("pushBuffer get an NULL buffer");
108        return -EINVAL;
109    }
110
111    Mutex::Autolock autoLock(mAdapterLock);
112    if (!mStarted) {
113        ALOGE("pushBuffer called before start");
114        return INVALID_OPERATION;
115    }
116    mCurrentMediaBuffer = buffer;
117    mBufferReadCond.signal();
118
119    ALOGV("wait for the buffer returned @ pushBuffer! %p", buffer);
120    mBufferReturnedCond.wait(mAdapterLock);
121
122    return OK;
123}
124
125}  // namespace android
126
127