audio policy: implement routing control

Add implementation of audio routing control via AudioSystem APIs.

The following APIs are implemented:
- listAudioPorts(): return a list of devices and output/input mixers ports
that can be used as sources or sinks for audio patches.
- createAudioPatch()/releaseAudioPatch(): create/release a connection patch between
two audio ports (e.g. to connect input from an HDMI device to a speaker output device).
Only one client application can own a patch from a given source.
When an audio port (device or mix) is part of an application created patch, its routing cannot
not be changed by a policy decision.
- listAudioPatches(): return a list of existing patches.

Each audio port addition/removal and each audio patch creation/release increments a generation count.
This generation count is used to ensure consistency betwen calls to
listAudioPorts() and listAudioPatches().

Bug: 14815883.

Change-Id: I022b638c2f5f0bb41543c7cfca7488fb45cfdd80

1 files changed, 18 insertions, 0 deletions

diff --git a/services/audiopolicy/AudioPolicyInterface.h b/services/audiopolicy/AudioPolicyInterface.h
index bb2deb6..98ad1d4 100644
--- a/services/audiopolicy/AudioPolicyInterface.h
+++ b/services/audiopolicy/AudioPolicyInterface.h
@@ -162,6 +162,24 @@ public:
     virtual status_t    dump(int fd) = 0;
 
     virtual bool isOffloadSupported(const audio_offload_info_t& offloadInfo) = 0;
+
+    virtual status_t listAudioPorts(audio_port_role_t role,
+                                    audio_port_type_t type,
+                                    unsigned int *num_ports,
+                                    struct audio_port *ports,
+                                    unsigned int *generation) = 0;
+    virtual status_t getAudioPort(struct audio_port *port) = 0;
+    virtual status_t createAudioPatch(const struct audio_patch *patch,
+                                       audio_patch_handle_t *handle,
+                                       uid_t uid) = 0;
+    virtual status_t releaseAudioPatch(audio_patch_handle_t handle,
+                                          uid_t uid) = 0;
+    virtual status_t listAudioPatches(unsigned int *num_patches,
+                                      struct audio_patch *patches,
+                                      unsigned int *generation) = 0;
+    virtual status_t setAudioPortConfig(const struct audio_port_config *config) = 0;
+    virtual void clearAudioPatches(uid_t uid) = 0;
+
 };