video: Modify classes to support camcorder pause/resume

* Modify MediaRecorder, CameraSource, AudioSource to
  be extendable.
* Add hooks to instantiate extended implementations to
  implement pause/resume.

Change-Id: I847263fc69e4f613c5ea60fb6809c7da176d3a8d

2 files changed, 7 insertions, 3 deletions

diff --git a/include/media/stagefright/AudioSource.h b/include/media/stagefright/AudioSource.h
index ed523d8..9750bcd 100644
--- a/include/media/stagefright/AudioSource.h
+++ b/include/media/stagefright/AudioSource.h
@@ -46,6 +46,8 @@ struct AudioSource : public MediaSource, public MediaBufferObserver {
     virtual status_t stop() { return reset(); }
     virtual sp<MetaData> getFormat();
 
+    virtual status_t pause() { return ERROR_UNSUPPORTED; }
+
     // Returns the maximum amplitude since last call.
     int16_t getMaxAmplitude();
 
@@ -58,7 +60,7 @@ struct AudioSource : public MediaSource, public MediaBufferObserver {
 protected:
     virtual ~AudioSource();
 
-private:
+protected:
     enum {
         //calculated for max duration 80 msec with 48K sampling rate.
         kMaxBufferSize = 30720,
@@ -102,7 +104,7 @@ private:
         int32_t startFrame, int32_t rampDurationFrames,
         uint8_t *data,   size_t bytes);
 
-    void queueInputBuffer_l(MediaBuffer *buffer, int64_t timeUs);
+    virtual void queueInputBuffer_l(MediaBuffer *buffer, int64_t timeUs);
     void releaseQueuedFrames_l();
     void waitOutstandingEncodingFrames_l();
     virtual status_t reset();
diff --git a/include/media/stagefright/CameraSource.h b/include/media/stagefright/CameraSource.h
index 069e897..527ee15 100644
--- a/include/media/stagefright/CameraSource.h
+++ b/include/media/stagefright/CameraSource.h
@@ -92,6 +92,8 @@ public:
     virtual status_t read(
             MediaBuffer **buffer, const ReadOptions *options = NULL);
 
+    virtual status_t pause() { return ERROR_UNSUPPORTED; }
+
     /**
      * Check whether a CameraSource object is properly initialized.
      * Must call this method before stop().
@@ -189,7 +191,7 @@ protected:
 
     void releaseCamera();
 
-private:
+protected:
     friend struct CameraSourceListener;
 
     Mutex mLock;