ztenghui | 4f1732b | 2013-02-04 15:59:38 -0800 | [diff] [blame] | 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 | |
| 25 | namespace android { |
| 26 | |
| 27 | MediaAdapter::MediaAdapter(const sp<MetaData> &meta) |
| 28 | : mCurrentMediaBuffer(NULL), |
| 29 | mStarted(false), |
| 30 | mOutputFormat(meta) { |
| 31 | } |
| 32 | |
| 33 | MediaAdapter::~MediaAdapter() { |
| 34 | Mutex::Autolock autoLock(mAdapterLock); |
| 35 | mOutputFormat.clear(); |
| 36 | CHECK(mCurrentMediaBuffer == NULL); |
| 37 | } |
| 38 | |
| 39 | status_t MediaAdapter::start(MetaData *params) { |
| 40 | Mutex::Autolock autoLock(mAdapterLock); |
| 41 | if (!mStarted) { |
| 42 | mStarted = true; |
| 43 | } |
| 44 | return OK; |
| 45 | } |
| 46 | |
| 47 | status_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 | |
| 63 | sp<MetaData> MediaAdapter::getFormat() { |
| 64 | Mutex::Autolock autoLock(mAdapterLock); |
| 65 | return mOutputFormat; |
| 66 | } |
| 67 | |
| 68 | void 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 | |
| 77 | status_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 | |
| 105 | status_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 | |