Playback rate on MediaPlayer

Add support for modifying the playback rate of a MediaPlayer
 by altering the sample rate of its AudioTrack.
The playback rate is expressed in permille, where 1000 is the
 playback at normal speed.

Change-Id: I981d060ab32f7bae7a767e82c60c88ae635dceed

2 files changed, 18 insertions, 0 deletions

diff --git a/media/libstagefright/AudioPlayer.cpp b/media/libstagefright/AudioPlayer.cpp
index 9a9c3ef..df27566 100644
--- a/media/libstagefright/AudioPlayer.cpp
+++ b/media/libstagefright/AudioPlayer.cpp
@@ -268,6 +268,16 @@ bool AudioPlayer::reachedEOS(status_t *finalStatus) {
     return mReachedEOS;
 }
 
+status_t AudioPlayer::setPlaybackRatePermille(int32_t ratePermille) {
+    if (mAudioSink.get() != NULL) {
+        return mAudioSink->setPlaybackRatePermille(ratePermille);
+    } else if (mAudioTrack != NULL){
+        return mAudioTrack->setSampleRate(ratePermille * mSampleRate / 1000);
+    } else {
+        return NO_INIT;
+    }
+}
+
 // static
 size_t AudioPlayer::AudioSinkCallback(
         MediaPlayerBase::AudioSink *audioSink,
diff --git a/media/libstagefright/AwesomePlayer.cpp b/media/libstagefright/AwesomePlayer.cpp
index 85b7979..70945e3 100644
--- a/media/libstagefright/AwesomePlayer.cpp
+++ b/media/libstagefright/AwesomePlayer.cpp
@@ -2251,6 +2251,14 @@ status_t AwesomePlayer::setParameter(int key, const Parcel &request) {
         {
             return setCacheStatCollectFreq(request);
         }
+        case KEY_PARAMETER_PLAYBACK_RATE_PERMILLE:
+        {
+            if (mAudioPlayer != NULL) {
+                return mAudioPlayer->setPlaybackRatePermille(request.readInt32());
+            } else {
+                return NO_INIT;
+            }
+        }
         default:
         {
             return ERROR_UNSUPPORTED;