Fix issue 1846343 - part 1

This change is the first part of a fix for issue 1846343, :
- Added new enum values for input sources in AudioRecord and MediaRecorder for voice uplink, downlink and uplink+downlink sources.
- renamed streamType to inputSource in all native functions handling audio record.

A second change is required in opencore author driver and android audio input to completely fix the issue.
diff --git a/include/media/AudioRecord.h b/include/media/AudioRecord.h
index 6aa40d0..3694803 100644
--- a/include/media/AudioRecord.h
+++ b/include/media/AudioRecord.h
@@ -39,10 +39,15 @@
 {
 public:
 
-    enum stream_type {
+    // input sources values must always be defined in the range
+    // [AudioRecord::DEFAULT_INPUT, AudioRecord::NUM_INPUT_SOURCES[
+    enum input_source {
         DEFAULT_INPUT   =-1,
         MIC_INPUT       = 0,
-        NUM_STREAM_TYPES
+        VOICE_UPLINK_INPUT = 1,
+        VOICE_DOWNLINK_INPUT = 2,
+        VOICE_CALL_INPUT = 3,
+        NUM_INPUT_SOURCES
     };
 
     static const int DEFAULT_SAMPLE_RATE = 8000;
@@ -118,7 +123,7 @@
      *
      * Parameters:
      *
-     * streamType:         Select the audio input to record to (e.g. AudioRecord::MIC_INPUT).
+     * inputSource:        Select the audio input to record to (e.g. AudioRecord::MIC_INPUT).
      * sampleRate:         Track sampling rate in Hz.
      * format:             PCM sample format (e.g AudioSystem::PCM_16_BIT for signed
      *                     16 bits per sample).
@@ -140,7 +145,7 @@
          RECORD_IIR_ENABLE = AudioSystem::TX_IIR_ENABLE
      };
 
-                        AudioRecord(int streamType,
+                        AudioRecord(int inputSource,
                                     uint32_t sampleRate = 0,
                                     int format          = 0,
                                     int channelCount    = 0,
@@ -165,7 +170,7 @@
      *  - NO_INIT: audio server or audio hardware not initialized
      *  - PERMISSION_DENIED: recording is not allowed for the requesting process
      * */
-            status_t    set(int streamType      = 0,
+            status_t    set(int inputSource     = 0,
                             uint32_t sampleRate = 0,
                             int format          = 0,
                             int channelCount    = 0,
@@ -197,6 +202,7 @@
             int         channelCount() const;
             uint32_t    frameCount() const;
             int         frameSize() const;
+            int         inputSource() const;
 
 
     /* After it's created the track is not active. Call start() to
@@ -323,7 +329,8 @@
     audio_track_cblk_t*     mCblk;
     uint8_t                 mFormat;
     uint8_t                 mChannelCount;
-    uint8_t                 mReserved[2];
+    uint8_t                 mInputSource;
+    uint8_t                 mReserved;
     status_t                mStatus;
     uint32_t                mLatency;
 
diff --git a/include/media/IAudioFlinger.h b/include/media/IAudioFlinger.h
index 6f13fe0..3e59d85 100644
--- a/include/media/IAudioFlinger.h
+++ b/include/media/IAudioFlinger.h
@@ -54,7 +54,7 @@
 
     virtual sp<IAudioRecord> openRecord(
                                 pid_t pid,
-                                int streamType,
+                                int inputSource,
                                 uint32_t sampleRate,
                                 int format,
                                 int channelCount,
diff --git a/include/media/mediarecorder.h b/include/media/mediarecorder.h
index b9ea0c6..aebe191 100644
--- a/include/media/mediarecorder.h
+++ b/include/media/mediarecorder.h
@@ -35,6 +35,10 @@
 enum audio_source {
     AUDIO_SOURCE_DEFAULT = 0,
     AUDIO_SOURCE_MIC = 1,
+    AUDIO_SOURCE_VOICE_UPLINK = 2,
+    AUDIO_SOURCE_VOICE_DOWNLINK = 3,
+    AUDIO_SOURCE_VOICE_CALL = 4,
+    AUDIO_SOURCE_MAX = AUDIO_SOURCE_VOICE_CALL
 };
 
 enum video_source {