1 /* 2 * Copyright (C) 2009 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 #ifndef AUDIO_SOURCE_H_ 18 19 #define AUDIO_SOURCE_H_ 20 21 #include <media/AudioRecord.h> 22 #include <media/AudioSystem.h> 23 #include <media/stagefright/MediaSource.h> 24 #include <media/stagefright/MediaBuffer.h> 25 #include <utils/List.h> 26 27 #include <system/audio.h> 28 29 namespace android { 30 31 class AudioRecord; 32 33 struct AudioSource : public MediaSource, public MediaBufferObserver { 34 // Note that the "channels" parameter _is_ the number of channels, 35 // _not_ a bitmask of audio_channels_t constants. 36 AudioSource( 37 audio_source_t inputSource, 38 uint32_t sampleRate, 39 uint32_t channels = 1); 40 41 status_t initCheck() const; 42 43 virtual status_t start(MetaData *params = NULL); 44 virtual status_t stop() { return reset(); } 45 virtual sp<MetaData> getFormat(); 46 47 // Returns the maximum amplitude since last call. 48 int16_t getMaxAmplitude(); 49 50 virtual status_t read( 51 MediaBuffer **buffer, const ReadOptions *options = NULL); 52 53 status_t dataCallback(const AudioRecord::Buffer& buffer); 54 virtual void signalBufferReturned(MediaBuffer *buffer); 55 56 protected: 57 virtual ~AudioSource(); 58 59 private: 60 enum { 61 kMaxBufferSize = 2048, 62 63 // After the initial mute, we raise the volume linearly 64 // over kAutoRampDurationUs. 65 kAutoRampDurationUs = 300000, 66 67 // This is the initial mute duration to suppress 68 // the video recording signal tone 69 kAutoRampStartUs = 0, 70 }; 71 72 Mutex mLock; 73 Condition mFrameAvailableCondition; 74 Condition mFrameEncodingCompletionCondition; 75 76 sp<AudioRecord> mRecord; 77 status_t mInitCheck; 78 bool mStarted; 79 int32_t mSampleRate; 80 81 bool mTrackMaxAmplitude; 82 int64_t mStartTimeUs; 83 int16_t mMaxAmplitude; 84 int64_t mPrevSampleTimeUs; 85 int64_t mInitialReadTimeUs; 86 int64_t mNumFramesReceived; 87 int64_t mNumClientOwnedBuffers; 88 89 List<MediaBuffer * > mBuffersReceived; 90 91 void trackMaxAmplitude(int16_t *data, int nSamples); 92 93 // This is used to raise the volume from mute to the 94 // actual level linearly. 95 void rampVolume( 96 int32_t startFrame, int32_t rampDurationFrames, 97 uint8_t *data, size_t bytes); 98 99 void queueInputBuffer_l(MediaBuffer *buffer, int64_t timeUs); 100 void releaseQueuedFrames_l(); 101 void waitOutstandingEncodingFrames_l(); 102 status_t reset(); 103 104 AudioSource(const AudioSource &); 105 AudioSource &operator=(const AudioSource &); 106 }; 107 108 } // namespace android 109 110 #endif // AUDIO_SOURCE_H_ 111