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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             audio_microphone_direction_t selectedMicDirection = MIC_DIRECTION_UNSPECIFIED,
     49             float selectedMicFieldDimension = MIC_FIELD_DIMENSION_NORMAL);
     50 
     51     status_t initCheck() const;
     52 
     53     virtual status_t start(MetaData *params = NULL);
     54     virtual status_t stop() { return reset(); }
     55     virtual sp<MetaData> getFormat();
     56 
     57     // Returns the maximum amplitude since last call.
     58     int16_t getMaxAmplitude();
     59 
     60     virtual status_t read(
     61             MediaBufferBase **buffer, const ReadOptions *options = NULL);
     62     virtual status_t setStopTimeUs(int64_t stopTimeUs);
     63 
     64     status_t dataCallback(const AudioRecord::Buffer& buffer);
     65     virtual void signalBufferReturned(MediaBufferBase *buffer);
     66 
     67     status_t setInputDevice(audio_port_handle_t deviceId);
     68     status_t getRoutedDeviceId(audio_port_handle_t* deviceId);
     69     status_t addAudioDeviceCallback(const sp<AudioSystem::AudioDeviceCallback>& callback);
     70     status_t removeAudioDeviceCallback(const sp<AudioSystem::AudioDeviceCallback>& callback);
     71 
     72     status_t getActiveMicrophones(std::vector<media::MicrophoneInfo>* activeMicrophones);
     73     status_t setPreferredMicrophoneDirection(audio_microphone_direction_t direction);
     74     status_t setPreferredMicrophoneFieldDimension(float zoom);
     75 
     76     status_t getPortId(audio_port_handle_t *portId) const;
     77 
     78 protected:
     79     virtual ~AudioSource();
     80 
     81 private:
     82     enum {
     83         kMaxBufferSize = 2048,
     84 
     85         // After the initial mute, we raise the volume linearly
     86         // over kAutoRampDurationUs.
     87         kAutoRampDurationUs = 300000,
     88 
     89         // This is the initial mute duration to suppress
     90         // the video recording signal tone
     91         kAutoRampStartUs = 0,
     92     };
     93 
     94     Mutex mLock;
     95     Condition mFrameAvailableCondition;
     96     Condition mFrameEncodingCompletionCondition;
     97 
     98     sp<AudioRecord> mRecord;
     99     status_t mInitCheck;
    100     bool mStarted;
    101     int32_t mSampleRate;
    102     int32_t mOutSampleRate;
    103 
    104     bool mTrackMaxAmplitude;
    105     int64_t mStartTimeUs;
    106     int64_t mStopSystemTimeUs;
    107     int64_t mLastFrameTimestampUs;
    108     int16_t mMaxAmplitude;
    109     int64_t mPrevSampleTimeUs;
    110     int64_t mInitialReadTimeUs;
    111     int64_t mNumFramesReceived;
    112     int64_t mNumFramesSkipped;
    113     int64_t mNumFramesLost;
    114     int64_t mNumClientOwnedBuffers;
    115     bool mNoMoreFramesToRead;
    116 
    117     List<MediaBuffer * > mBuffersReceived;
    118 
    119     void trackMaxAmplitude(int16_t *data, int nSamples);
    120 
    121     // This is used to raise the volume from mute to the
    122     // actual level linearly.
    123     void rampVolume(
    124         int32_t startFrame, int32_t rampDurationFrames,
    125         uint8_t *data,   size_t bytes);
    126 
    127     void queueInputBuffer_l(MediaBuffer *buffer, int64_t timeUs);
    128     void releaseQueuedFrames_l();
    129     void waitOutstandingEncodingFrames_l();
    130     status_t reset();
    131 
    132     AudioSource(const AudioSource &);
    133     AudioSource &operator=(const AudioSource &);
    134 };
    135 
    136 }  // namespace android
    137 
    138 #endif  // AUDIO_SOURCE_H_
    139