Fix permission check for audio recording

Define input types covering the different usecases for audio
  recording, and check the corresponding permissions when
  starting to record.
Move the permission check from audio flinger to audio policy,
  as only the policy has the information to determine which
  permission to enforce.
Fix missing permission when an application records audio
  and the audio is injected by an external policy.

Bug 18736417

Change-Id: If7ec040502242c990ac8ea464db484339bdce573

1 files changed, 12 insertions, 1 deletions

diff --git a/services/audiopolicy/AudioPolicyInterface.h b/services/audiopolicy/AudioPolicyInterface.h
index 2826cad..4508fa7 100644
--- a/services/audiopolicy/AudioPolicyInterface.h
+++ b/services/audiopolicy/AudioPolicyInterface.h
@@ -57,6 +57,16 @@ class AudioPolicyInterface
 {
 
 public:
+    typedef enum {
+        API_INPUT_INVALID = -1,
+        API_INPUT_LEGACY  = 0,// e.g. audio recording from a microphone
+        API_INPUT_MIX_CAPTURE,// used for "remote submix", capture of the media to play it remotely
+        API_INPUT_MIX_EXT_POLICY_REROUTE,// used for platform audio rerouting, where mixes are
+                                         // handled by external and dynamically installed
+                                         // policies which reroute audio mixes
+    } input_type_t;
+
+public:
     virtual ~AudioPolicyInterface() {}
     //
     // configuration functions
@@ -120,7 +130,8 @@ public:
                                      uint32_t samplingRate,
                                      audio_format_t format,
                                      audio_channel_mask_t channelMask,
-                                     audio_input_flags_t flags) = 0;
+                                     audio_input_flags_t flags,
+                                     input_type_t *inputType) = 0;
     // indicates to the audio policy manager that the input starts being used.
     virtual status_t startInput(audio_io_handle_t input,
                                 audio_session_t session) = 0;