audio policy: new getOutputForAttr() prototype.

Update getOutputForAttr() prototype and group all logic
dealing with audio attributes to stream type conversion in
audio policy manager.

getOutputForAttr():
- specifies the audio session (for future use)
- returns a status code
- receives either stream type (for legacy) or audio attributes
- returns an updated streamtype

Remove logic dealing with legacy stream types to attributes conversion
from AudioTrack.

Use correct type for audio sessions in other APIs (startOutput() ...).

releaseOutput() specifies the audio session (for future use).

Bug: 18067208.

Change-Id: I1bfbe9626c04c7955d77f8a70aecfad2cb204817

1 files changed, 14 insertions, 9 deletions

diff --git a/services/audiopolicy/AudioPolicyInterface.h b/services/audiopolicy/AudioPolicyInterface.h
index 5524463..f7ffb6d 100644
--- a/services/audiopolicy/AudioPolicyInterface.h
+++ b/services/audiopolicy/AudioPolicyInterface.h
@@ -90,22 +90,27 @@ public:
                                         audio_channel_mask_t channelMask,
                                         audio_output_flags_t flags,
                                         const audio_offload_info_t *offloadInfo) = 0;
-    virtual audio_io_handle_t getOutputForAttr(const audio_attributes_t *attr,
-                                                uint32_t samplingRate,
-                                                audio_format_t format,
-                                                audio_channel_mask_t channelMask,
-                                                audio_output_flags_t flags,
-                                                const audio_offload_info_t *offloadInfo) = 0;
+    virtual status_t getOutputForAttr(const audio_attributes_t *attr,
+                                        audio_io_handle_t *output,
+                                        audio_session_t session,
+                                        audio_stream_type_t *stream,
+                                        uint32_t samplingRate,
+                                        audio_format_t format,
+                                        audio_channel_mask_t channelMask,
+                                        audio_output_flags_t flags,
+                                        const audio_offload_info_t *offloadInfo) = 0;
     // indicates to the audio policy manager that the output starts being used by corresponding stream.
     virtual status_t startOutput(audio_io_handle_t output,
                                  audio_stream_type_t stream,
-                                 int session = 0) = 0;
+                                 audio_session_t session) = 0;
     // indicates to the audio policy manager that the output stops being used by corresponding stream.
     virtual status_t stopOutput(audio_io_handle_t output,
                                 audio_stream_type_t stream,
-                                int session = 0) = 0;
+                                audio_session_t session) = 0;
     // releases the output.
-    virtual void releaseOutput(audio_io_handle_t output) = 0;
+    virtual void releaseOutput(audio_io_handle_t output,
+                               audio_stream_type_t stream,
+                               audio_session_t session) = 0;
 
     // request an input appropriate for record from the supplied device with supplied parameters.
     virtual audio_io_handle_t getInput(audio_source_t inputSource,