Add support for deep audio buffers
Allow AudioSink to use deep audio buffering when the
source is audio only and its duration is more than
a certain threshold.
This helps improve battery life but implies higher
audio latency.
Change-Id: Ie79915b61c370292f05aabda9779356570e03cbb
diff --git a/include/media/MediaPlayerInterface.h b/include/media/MediaPlayerInterface.h
index 9a8f4b0..a70fe8c 100644
--- a/include/media/MediaPlayerInterface.h
+++ b/include/media/MediaPlayerInterface.h
@@ -63,6 +63,9 @@
// when the channel mask isn't known, use the channel count to derive a mask in AudioSink::open()
#define CHANNEL_MASK_USE_CHANNEL_ORDER 0
+// duration below which we do not allow deep audio buffering
+#define AUDIO_SINK_MIN_DEEP_BUFFER_DURATION_US 5000000
+
// callback mechanism for passing messages to MediaPlayer object
typedef void (*notify_callback_f)(void* cookie,
int msg, int ext1, int ext2, const Parcel *obj);
@@ -98,7 +101,8 @@
audio_format_t format=AUDIO_FORMAT_PCM_16_BIT,
int bufferCount=DEFAULT_AUDIOSINK_BUFFERCOUNT,
AudioCallback cb = NULL,
- void *cookie = NULL) = 0;
+ void *cookie = NULL,
+ audio_output_flags_t flags = AUDIO_OUTPUT_FLAG_NONE) = 0;
virtual void start() = 0;
virtual ssize_t write(const void* buffer, size_t size) = 0;
diff --git a/include/media/stagefright/AudioPlayer.h b/include/media/stagefright/AudioPlayer.h
index 70c47ae..9e8e4bb 100644
--- a/include/media/stagefright/AudioPlayer.h
+++ b/include/media/stagefright/AudioPlayer.h
@@ -37,6 +37,7 @@
};
AudioPlayer(const sp<MediaPlayerBase::AudioSink> &audioSink,
+ bool allowDeepBuffering = false,
AwesomePlayer *audioObserver = NULL);
virtual ~AudioPlayer();
@@ -95,6 +96,8 @@
MediaBuffer *mFirstBuffer;
sp<MediaPlayerBase::AudioSink> mAudioSink;
+ bool mAllowDeepBuffering; // allow audio deep audio buffers. Helps with low power audio
+ // playback but implies high latency
AwesomePlayer *mObserver;
static void AudioCallback(int event, void *user, void *info);