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      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/MediaSource.h>
     24 #include <media/MicrophoneInfo.h>
     25 #include <media/stagefright/MediaBuffer.h>
     26 #include <utils/List.h>
     27 
     28 #include <system/audio.h>
     29 
     30 #include <vector>
     31 
     32 namespace android {
     33 
     34 class AudioRecord;
     35 
     36 struct AudioSource : public MediaSource, public MediaBufferObserver {
     37     // Note that the "channels" parameter _is_ the number of channels,
     38     // _not_ a bitmask of audio_channels_t constants.
     39     AudioSource(
     40             audio_source_t inputSource,
     41             const String16 &opPackageName,
     42             uint32_t sampleRate,
     43             uint32_t channels,
     44             uint32_t outSampleRate = 0,
     45             uid_t uid = -1,
     46             pid_t pid = -1,
     47             audio_port_handle_t selectedDeviceId = AUDIO_PORT_HANDLE_NONE);
     48 
     49     status_t initCheck() const;
     50 
     51     virtual status_t start(MetaData *params = NULL);
     52     virtual status_t stop() { return reset(); }
     53     virtual sp<MetaData> getFormat();
     54 
     55     // Returns the maximum amplitude since last call.
     56     int16_t getMaxAmplitude();
     57 
     58     virtual status_t read(
     59             MediaBufferBase **buffer, const ReadOptions *options = NULL);
     60     virtual status_t setStopTimeUs(int64_t stopTimeUs);
     61 
     62     status_t dataCallback(const AudioRecord::Buffer& buffer);
     63     virtual void signalBufferReturned(MediaBufferBase *buffer);
     64 
     65     status_t setInputDevice(audio_port_handle_t deviceId);
     66     status_t getRoutedDeviceId(audio_port_handle_t* deviceId);
     67     status_t addAudioDeviceCallback(const sp<AudioSystem::AudioDeviceCallback>& callback);
     68     status_t removeAudioDeviceCallback(const sp<AudioSystem::AudioDeviceCallback>& callback);
     69 
     70     status_t getActiveMicrophones(std::vector<media::MicrophoneInfo>* activeMicrophones);
     71 
     72 
     73 protected:
     74     virtual ~AudioSource();
     75 
     76 private:
     77     enum {
     78         kMaxBufferSize = 2048,
     79 
     80         // After the initial mute, we raise the volume linearly
     81         // over kAutoRampDurationUs.
     82         kAutoRampDurationUs = 300000,
     83 
     84         // This is the initial mute duration to suppress
     85         // the video recording signal tone
     86         kAutoRampStartUs = 0,
     87     };
     88 
     89     Mutex mLock;
     90     Condition mFrameAvailableCondition;
     91     Condition mFrameEncodingCompletionCondition;
     92 
     93     sp<AudioRecord> mRecord;
     94     status_t mInitCheck;
     95     bool mStarted;
     96     int32_t mSampleRate;
     97     int32_t mOutSampleRate;
     98 
     99     bool mTrackMaxAmplitude;
    100     int64_t mStartTimeUs;
    101     int64_t mStopSystemTimeUs;
    102     int64_t mLastFrameTimestampUs;
    103     int16_t mMaxAmplitude;
    104     int64_t mPrevSampleTimeUs;
    105     int64_t mInitialReadTimeUs;
    106     int64_t mNumFramesReceived;
    107     int64_t mNumFramesSkipped;
    108     int64_t mNumFramesLost;
    109     int64_t mNumClientOwnedBuffers;
    110     bool mNoMoreFramesToRead;
    111 
    112     List<MediaBuffer * > mBuffersReceived;
    113 
    114     void trackMaxAmplitude(int16_t *data, int nSamples);
    115 
    116     // This is used to raise the volume from mute to the
    117     // actual level linearly.
    118     void rampVolume(
    119         int32_t startFrame, int32_t rampDurationFrames,
    120         uint8_t *data,   size_t bytes);
    121 
    122     void queueInputBuffer_l(MediaBuffer *buffer, int64_t timeUs);
    123     void releaseQueuedFrames_l();
    124     void waitOutstandingEncodingFrames_l();
    125     status_t reset();
    126 
    127     AudioSource(const AudioSource &);
    128     AudioSource &operator=(const AudioSource &);
    129 };
    130 
    131 }  // namespace android
    132 
    133 #endif  // AUDIO_SOURCE_H_
    134