| /* |
| * Copyright (C) 2009 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #ifndef AUDIO_SOURCE_H_ |
| |
| #define AUDIO_SOURCE_H_ |
| |
| #include <media/AudioRecord.h> |
| #include <media/AudioSystem.h> |
| #include <media/stagefright/MediaSource.h> |
| #include <media/stagefright/MediaBuffer.h> |
| #include <utils/List.h> |
| |
| namespace android { |
| |
| class AudioRecord; |
| |
| struct AudioSource : public MediaSource, public MediaBufferObserver { |
| // Note that the "channels" parameter is _not_ the number of channels, |
| // but a bitmask of AudioSystem::audio_channels constants. |
| AudioSource( |
| int inputSource, uint32_t sampleRate, |
| uint32_t channels = AudioSystem::CHANNEL_IN_MONO); |
| |
| status_t initCheck() const; |
| |
| virtual status_t start(MetaData *params = NULL); |
| virtual status_t stop(); |
| virtual sp<MetaData> getFormat(); |
| |
| // Returns the maximum amplitude since last call. |
| int16_t getMaxAmplitude(); |
| |
| virtual status_t read( |
| MediaBuffer **buffer, const ReadOptions *options = NULL); |
| |
| status_t dataCallbackTimestamp(const AudioRecord::Buffer& buffer, int64_t timeUs); |
| virtual void signalBufferReturned(MediaBuffer *buffer); |
| |
| protected: |
| virtual ~AudioSource(); |
| |
| private: |
| enum { |
| kMaxBufferSize = 2048, |
| |
| // After the initial mute, we raise the volume linearly |
| // over kAutoRampDurationUs. |
| kAutoRampDurationUs = 700000, |
| |
| // This is the initial mute duration to suppress |
| // the video recording signal tone |
| kAutoRampStartUs = 1000000, |
| }; |
| |
| Mutex mLock; |
| Condition mFrameAvailableCondition; |
| Condition mFrameEncodingCompletionCondition; |
| |
| AudioRecord *mRecord; |
| status_t mInitCheck; |
| bool mStarted; |
| int32_t mSampleRate; |
| |
| bool mTrackMaxAmplitude; |
| int64_t mStartTimeUs; |
| int16_t mMaxAmplitude; |
| int64_t mPrevSampleTimeUs; |
| int64_t mInitialReadTimeUs; |
| int64_t mNumFramesReceived; |
| int64_t mNumClientOwnedBuffers; |
| |
| List<MediaBuffer * > mBuffersReceived; |
| |
| void trackMaxAmplitude(int16_t *data, int nSamples); |
| |
| // This is used to raise the volume from mute to the |
| // actual level linearly. |
| void rampVolume( |
| int32_t startFrame, int32_t rampDurationFrames, |
| uint8_t *data, size_t bytes); |
| |
| void releaseQueuedFrames_l(); |
| void waitOutstandingEncodingFrames_l(); |
| |
| AudioSource(const AudioSource &); |
| AudioSource &operator=(const AudioSource &); |
| }; |
| |
| } // namespace android |
| |
| #endif // AUDIO_SOURCE_H_ |