stagefright: offload playback support

Offloading of compressed audio decoding to audio DSP
is implemented for audio only, non streamed content.
when the datasource is

AudioPlayer:
- Create an offloaded sink when playing a compressed
source
- Send metadata to audio HAL
- Return sink start error to AwesomePlayer so that a
new player for PCM audio can be created in case of problem.
- Forward stream end and tear down callback events to AwesomePlayer
- Stop the sink and wait for stream end callback when EOS is reached.
- Pause and restart the sink if needed before flushing when seeking
(otherwise flush is a no op).
- For current media time, directly query the render position from the
sink and offset by the start position (seek to time)

AwesomePlayer:

- When initializing the audio decoder, check with audio policy manager
if offloading is supported. If yes, create the software decoder in
case a reconfiguration is needed but connect the audio track directly
to the AudioPlayer.
- In case of error when starting the AudioPlayer, reconnect the software
decoder (OMXSource) and recreate a PCM AudioPlayer.
- Handle AudioPlayer tear down event by detroying and recreating the
AudioPlayer to allow transitions between situations were offloading
is supported or not.
- Force tear down of offloaded AudioPlayer when paused for a certain time:
This will close the sink and allow the DSP to power down.

Utils:
- Added helper methods:
    - send meta data to audio ia sink setParameters
    - query audio policy manager if offloading is supported for a
given audio content

Change-Id: I115842ce424f947b966d45e253a74d3fd5df9aae
Signed-off-by: Eric Laurent <elaurent@google.com>

2 files changed, 3 insertions, 2 deletions

diff --git a/libvideoeditor/lvpp/VideoEditorAudioPlayer.cpp b/libvideoeditor/lvpp/VideoEditorAudioPlayer.cpp
index dc360a5..176f8e9 100755
--- a/libvideoeditor/lvpp/VideoEditorAudioPlayer.cpp
+++ b/libvideoeditor/lvpp/VideoEditorAudioPlayer.cpp
@@ -149,7 +149,7 @@ void VideoEditorAudioPlayer::clear() {
     mStarted = false;
 }
 
-void VideoEditorAudioPlayer::resume() {
+status_t VideoEditorAudioPlayer::resume() {
     ALOGV("resume");
 
     AudioMixSettings audioMixSettings;
@@ -180,6 +180,7 @@ void VideoEditorAudioPlayer::resume() {
     } else {
         mAudioTrack->start();
     }
+    return OK;
 }
 
 status_t VideoEditorAudioPlayer::seekTo(int64_t time_us) {
diff --git a/libvideoeditor/lvpp/VideoEditorAudioPlayer.h b/libvideoeditor/lvpp/VideoEditorAudioPlayer.h
index d2e652d..2caf5e8 100755
--- a/libvideoeditor/lvpp/VideoEditorAudioPlayer.h
+++ b/libvideoeditor/lvpp/VideoEditorAudioPlayer.h
@@ -58,7 +58,7 @@ public:
 
     status_t start(bool sourceAlreadyStarted = false);
     void pause(bool playPendingSamples = false);
-    void resume();
+    status_t resume();
     status_t seekTo(int64_t time_us);
     bool isSeeking();
     bool reachedEOS(status_t *finalStatus);