Prepare for transmitting audio through AudioSource.

AudioSource can now be configured to output buffers timestamped based
on looper time (absolute) instead of based on systemTime() relative to
start time.

Change-Id: I8eca42648eb50033ac4aafbe5daac64a98a40690

1 files changed, 14 insertions, 5 deletions

diff --git a/include/media/stagefright/AudioSource.h b/include/media/stagefright/AudioSource.h
index f5466e8..de7edf3 100644
--- a/include/media/stagefright/AudioSource.h
+++ b/include/media/stagefright/AudioSource.h
@@ -31,11 +31,12 @@ namespace android {
 class AudioRecord;
 
 struct AudioSource : public MediaSource, public MediaBufferObserver {
-    // Note that the "channels" parameter is _not_ the number of channels,
-    // but a bitmask of audio_channels_t constants.
+    // Note that the "channels" parameter _is_ the number of channels,
+    // _not_ a bitmask of audio_channels_t constants.
     AudioSource(
-            audio_source_t inputSource, uint32_t sampleRate,
-            uint32_t channels = AUDIO_CHANNEL_IN_MONO);
+            audio_source_t inputSource,
+            uint32_t sampleRate,
+            uint32_t channels = 1);
 
     status_t initCheck() const;
 
@@ -49,9 +50,15 @@ struct AudioSource : public MediaSource, public MediaBufferObserver {
     virtual status_t read(
             MediaBuffer **buffer, const ReadOptions *options = NULL);
 
-    status_t dataCallbackTimestamp(const AudioRecord::Buffer& buffer, int64_t timeUs);
+    status_t dataCallback(const AudioRecord::Buffer& buffer);
     virtual void signalBufferReturned(MediaBuffer *buffer);
 
+    // If useLooperTime == true, buffers will carry absolute timestamps
+    // as returned by ALooper::GetNowUs(), otherwise systemTime() is used
+    // and buffers contain timestamps relative to start time.
+    // The default is to _not_ use looper time.
+    void setUseLooperTime(bool useLooperTime);
+
 protected:
     virtual ~AudioSource();
 
@@ -87,6 +94,8 @@ private:
 
     List<MediaBuffer * > mBuffersReceived;
 
+    bool mUseLooperTime;
+
     void trackMaxAmplitude(int16_t *data, int nSamples);
 
     // This is used to raise the volume from mute to the