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    MediaBuffer *currentBuffer = NULL;
49    {
50        Mutex::Autolock autoLock(mAdapterLock);
51        if (mStarted) {
52            mStarted = false;
53            // If stop() happens immediately after a pushBuffer(), we should
54            // clean up the mCurrentMediaBuffer. But need to release without
55            // the lock as signalBufferReturned() will acquire the lock.
56            currentBuffer = mCurrentMediaBuffer;
57            mCurrentMediaBuffer = NULL;
58
59            // While read() is still waiting, we should signal it to finish.
60            mBufferReadCond.signal();
61        }
62    }
63    if (currentBuffer != NULL) {
64        currentBuffer->release();
65        currentBuffer = NULL;
66    }
67    return OK;
68}
69
70sp<MetaData> MediaAdapter::getFormat() {
71    Mutex::Autolock autoLock(mAdapterLock);
72    return mOutputFormat;
73}
74
75void MediaAdapter::signalBufferReturned(MediaBufferBase *buffer) {
76    Mutex::Autolock autoLock(mAdapterLock);
77    CHECK(buffer != NULL);
78    buffer->setObserver(0);
79    buffer->release();
80    ALOGV("buffer returned %p", buffer);
81    mBufferReturnedCond.signal();
82}
83
84status_t MediaAdapter::read(
85            MediaBufferBase **buffer, const ReadOptions * /* options */) {
86    Mutex::Autolock autoLock(mAdapterLock);
87    if (!mStarted) {
88        ALOGV("Read before even started!");
89        return ERROR_END_OF_STREAM;
90    }
91
92    while (mCurrentMediaBuffer == NULL && mStarted) {
93        ALOGV("waiting @ read()");
94        mBufferReadCond.wait(mAdapterLock);
95    }
96
97    if (!mStarted) {
98        ALOGV("read interrupted after stop");
99        CHECK(mCurrentMediaBuffer == NULL);
100        return ERROR_END_OF_STREAM;
101    }
102
103    CHECK(mCurrentMediaBuffer != NULL);
104
105    *buffer = mCurrentMediaBuffer;
106    mCurrentMediaBuffer = NULL;
107
108    return OK;
109}
110
111status_t MediaAdapter::pushBuffer(MediaBuffer *buffer) {
112    if (buffer == NULL) {
113        ALOGE("pushBuffer get an NULL buffer");
114        return -EINVAL;
115    }
116
117    Mutex::Autolock autoLock(mAdapterLock);
118    if (!mStarted) {
119        ALOGE("pushBuffer called before start");
120        return INVALID_OPERATION;
121    }
122    mCurrentMediaBuffer = buffer;
123    mCurrentMediaBuffer->setObserver(this);
124    mBufferReadCond.signal();
125
126    ALOGV("wait for the buffer returned @ pushBuffer! %p", buffer);
127    mBufferReturnedCond.wait(mAdapterLock);
128
129    return OK;
130}
131
132}  // namespace android
133
134