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      1 /*
      2 **
      3 ** Copyright 2012, The Android Open Source Project
      4 **
      5 ** Licensed under the Apache License, Version 2.0 (the "License");
      6 ** you may not use this file except in compliance with the License.
      7 ** You may obtain a copy of the License at
      8 **
      9 **     http://www.apache.org/licenses/LICENSE-2.0
     10 **
     11 ** Unless required by applicable law or agreed to in writing, software
     12 ** distributed under the License is distributed on an "AS IS" BASIS,
     13 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     14 ** See the License for the specific language governing permissions and
     15 ** limitations under the License.
     16 */
     17 
     18 #ifndef INCLUDING_FROM_AUDIOFLINGER_H
     19     #error This header file should only be included from AudioFlinger.h
     20 #endif
     21 
     22 // record track
     23 class RecordTrack : public TrackBase {
     24 public:
     25                         RecordTrack(RecordThread *thread,
     26                                 const sp<Client>& client,
     27                                 const audio_attributes_t& attr,
     28                                 uint32_t sampleRate,
     29                                 audio_format_t format,
     30                                 audio_channel_mask_t channelMask,
     31                                 size_t frameCount,
     32                                 void *buffer,
     33                                 size_t bufferSize,
     34                                 audio_session_t sessionId,
     35                                 uid_t uid,
     36                                 audio_input_flags_t flags,
     37                                 track_type type,
     38                                 audio_port_handle_t portId = AUDIO_PORT_HANDLE_NONE);
     39     virtual             ~RecordTrack();
     40     virtual status_t    initCheck() const;
     41 
     42     virtual status_t    start(AudioSystem::sync_event_t event, audio_session_t triggerSession);
     43     virtual void        stop();
     44 
     45             void        destroy();
     46 
     47     virtual void        invalidate();
     48             // clear the buffer overflow flag
     49             void        clearOverflow() { mOverflow = false; }
     50             // set the buffer overflow flag and return previous value
     51             bool        setOverflow() { bool tmp = mOverflow; mOverflow = true;
     52                                                 return tmp; }
     53 
     54     static  void        appendDumpHeader(String8& result);
     55             void        appendDump(String8& result, bool active);
     56 
     57             void        handleSyncStartEvent(const sp<SyncEvent>& event);
     58             void        clearSyncStartEvent();
     59 
     60             void        updateTrackFrameInfo(int64_t trackFramesReleased,
     61                                              int64_t sourceFramesRead,
     62                                              uint32_t halSampleRate,
     63                                              const ExtendedTimestamp &timestamp);
     64 
     65     virtual bool        isFastTrack() const { return (mFlags & AUDIO_INPUT_FLAG_FAST) != 0; }
     66 
     67             void        setSilenced(bool silenced) { if (!isPatchTrack()) mSilenced = silenced; }
     68             bool        isSilenced() const { return mSilenced; }
     69 
     70             status_t    getActiveMicrophones(std::vector<media::MicrophoneInfo>* activeMicrophones);
     71 
     72 private:
     73     friend class AudioFlinger;  // for mState
     74 
     75     DISALLOW_COPY_AND_ASSIGN(RecordTrack);
     76 
     77     // AudioBufferProvider interface
     78     virtual status_t getNextBuffer(AudioBufferProvider::Buffer* buffer);
     79     // releaseBuffer() not overridden
     80 
     81     bool                mOverflow;  // overflow on most recent attempt to fill client buffer
     82 
     83             AudioBufferProvider::Buffer mSink;  // references client's buffer sink in shared memory
     84 
     85             // sync event triggering actual audio capture. Frames read before this event will
     86             // be dropped and therefore not read by the application.
     87             sp<SyncEvent>                       mSyncStartEvent;
     88 
     89             // number of captured frames to drop after the start sync event has been received.
     90             // when < 0, maximum frames to drop before starting capture even if sync event is
     91             // not received
     92             ssize_t                             mFramesToDrop;
     93 
     94             // used by resampler to find source frames
     95             ResamplerBufferProvider            *mResamplerBufferProvider;
     96 
     97             // used by the record thread to convert frames to proper destination format
     98             RecordBufferConverter              *mRecordBufferConverter;
     99             audio_input_flags_t                mFlags;
    100 
    101             bool                               mSilenced;
    102 };
    103 
    104 // playback track, used by PatchPanel
    105 class PatchRecord : virtual public RecordTrack, public PatchProxyBufferProvider {
    106 public:
    107 
    108     PatchRecord(RecordThread *recordThread,
    109                 uint32_t sampleRate,
    110                 audio_channel_mask_t channelMask,
    111                 audio_format_t format,
    112                 size_t frameCount,
    113                 void *buffer,
    114                 size_t bufferSize,
    115                 audio_input_flags_t flags);
    116     virtual             ~PatchRecord();
    117 
    118     // AudioBufferProvider interface
    119     virtual status_t getNextBuffer(AudioBufferProvider::Buffer* buffer);
    120     virtual void releaseBuffer(AudioBufferProvider::Buffer* buffer);
    121 
    122     // PatchProxyBufferProvider interface
    123     virtual status_t    obtainBuffer(Proxy::Buffer *buffer,
    124                                      const struct timespec *timeOut = NULL);
    125     virtual void        releaseBuffer(Proxy::Buffer *buffer);
    126 
    127     void setPeerProxy(PatchProxyBufferProvider *proxy) { mPeerProxy = proxy; }
    128 
    129 private:
    130     sp<ClientProxy>             mProxy;
    131     PatchProxyBufferProvider*   mPeerProxy;
    132     struct timespec             mPeerTimeout;
    133 };  // end of PatchRecord
    134