libmedia: offloaded playback support

- start() returns a status so that upper layers can
recreate a non offloaded track in case of error.

- Added states to handle offloaded tracks specific:
  - waiting for stream end (drain) notification by
audio flinger
  - allow pause while waiting for stream end notification

- getPosition() queries the render position directly from
audio HAL.

- disable APIs not applicable to offloaded tracks

- Modified track restoring behavior for invalidated
offloaded tracks: just send the callback and wait for
upper layers to create a new track.

- Added wait for stream end management in audio track client
proxy. Similar to obtainBuffer and should be factored in.

Change-Id: I0fc48117946364cb255afd653195498891f622bd
Signed-off-by: Eric Laurent <elaurent@google.com>

1 files changed, 13 insertions, 2 deletions

diff --git a/media/libmedia/IAudioFlinger.cpp b/media/libmedia/IAudioFlinger.cpp
index 2e2c0cc..c670936 100644
--- a/media/libmedia/IAudioFlinger.cpp
+++ b/media/libmedia/IAudioFlinger.cpp
@@ -372,7 +372,6 @@ public:
         audio_channel_mask_t channelMask = pChannelMask != NULL ?
                 *pChannelMask : (audio_channel_mask_t)0;
         uint32_t latency = pLatencyMs != NULL ? *pLatencyMs : 0;
-
         data.writeInterfaceToken(IAudioFlinger::getInterfaceDescriptor());
         data.writeInt32(module);
         data.writeInt32(devices);
@@ -381,6 +380,12 @@ public:
         data.writeInt32(channelMask);
         data.writeInt32(latency);
         data.writeInt32((int32_t) flags);
+        if (offloadInfo == NULL) {
+            data.writeInt32(0);
+        } else {
+            data.writeInt32(1);
+            data.write(offloadInfo, sizeof(audio_offload_info_t));
+        }
         remote()->transact(OPEN_OUTPUT, data, &reply);
         audio_io_handle_t output = (audio_io_handle_t) reply.readInt32();
         ALOGV("openOutput() returned output, %d", output);
@@ -881,13 +886,19 @@ status_t BnAudioFlinger::onTransact(
             audio_channel_mask_t channelMask = (audio_channel_mask_t)data.readInt32();
             uint32_t latency = data.readInt32();
             audio_output_flags_t flags = (audio_output_flags_t) data.readInt32();
+            bool hasOffloadInfo = data.readInt32() != 0;
+            audio_offload_info_t offloadInfo;
+            if (hasOffloadInfo) {
+                data.read(&offloadInfo, sizeof(audio_offload_info_t));
+            }
             audio_io_handle_t output = openOutput(module,
                                                  &devices,
                                                  &samplingRate,
                                                  &format,
                                                  &channelMask,
                                                  &latency,
-                                                 flags);
+                                                 flags,
+                                                 hasOffloadInfo ? &offloadInfo : NULL);
             ALOGV("OPEN_OUTPUT output, %p", output);
             reply->writeInt32((int32_t) output);
             reply->writeInt32(devices);