Get CamcorderProfile from incoming video size (#477)

cameraview/src/main/java/com/otaliastudios/cameraview/CamcorderProfiles.java

@@ -0,0 +1,68 @@
+package com.otaliastudios.cameraview;
+
+import android.annotation.SuppressLint;
+import android.media.CamcorderProfile;
+import android.os.Build;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import androidx.annotation.NonNull;
+
+/**
+ * Wraps the {@link android.media.CamcorderProfile} static utilities.
+ */
+class CamcorderProfiles {
+
+    @SuppressLint("UseSparseArrays")
+    private static Map<Size, Integer> sizeToProfileMap = new HashMap<>();
+
+    static {
+        sizeToProfileMap.put(new Size(176, 144), CamcorderProfile.QUALITY_QCIF);
+        sizeToProfileMap.put(new Size(320, 240), CamcorderProfile.QUALITY_QVGA);
+        sizeToProfileMap.put(new Size(352, 288), CamcorderProfile.QUALITY_CIF);
+        sizeToProfileMap.put(new Size(720, 480), CamcorderProfile.QUALITY_480P);
+        sizeToProfileMap.put(new Size(1280, 720), CamcorderProfile.QUALITY_720P);
+        sizeToProfileMap.put(new Size(1920, 1080), CamcorderProfile.QUALITY_1080P);
+        if (Build.VERSION.SDK_INT >= 21) {
+            sizeToProfileMap.put(new Size(3840, 2160), CamcorderProfile.QUALITY_2160P);
+        }
+    }
+
+    /**
+     * Returns a CamcorderProfile that's somewhat coherent with the target size,
+     * to ensure we get acceptable video/audio parameters for MediaRecorders (most notably the bitrate).
+     *
+     * @param cameraId the camera id
+     * @param targetSize the target video size
+     * @return a profile
+     */
+    @NonNull
+    static CamcorderProfile get(int cameraId, @NonNull Size targetSize) {
+        final int targetArea = targetSize.getWidth() * targetSize.getHeight();
+        List<Size> sizes = new ArrayList<>(sizeToProfileMap.keySet());
+        Collections.sort(sizes, new Comparator<Size>() {
+            @Override
+            public int compare(Size s1, Size s2) {
+                int a1 = Math.abs(s1.getWidth() * s1.getHeight() - targetArea);
+                int a2 = Math.abs(s2.getWidth() * s2.getHeight() - targetArea);
+                //noinspection UseCompareMethod
+                return (a1 < a2) ? -1 : ((a1 == a2) ? 0 : 1);
+            }
+        });
+        while (sizes.size() > 0) {
+            Size candidate = sizes.remove(0);
+            //noinspection ConstantConditions
+            int quality = sizeToProfileMap.get(candidate);
+            if (CamcorderProfile.hasProfile(cameraId, quality)) {
+                return CamcorderProfile.get(cameraId, quality);
+            }
+        }
+        // Should never happen, but fallback to low.
+        return CamcorderProfile.get(cameraId, CamcorderProfile.QUALITY_LOW);
+    }
+}

cameraview/src/main/java/com/otaliastudios/cameraview/FullVideoRecorder.java

@@ -18,6 +18,7 @@ class FullVideoRecorder extends VideoRecorder {
     private CamcorderProfile mProfile;
     private Camera1 mController;
     private Camera mCamera;
+    private Size mSize;
 
     FullVideoRecorder(@NonNull VideoResult stub, @Nullable VideoResultListener listener,
                       @NonNull Camera1 controller, @NonNull Camera camera, int cameraId) {
@@ -27,11 +28,10 @@ class FullVideoRecorder extends VideoRecorder {
         mMediaRecorder = new MediaRecorder();
         mMediaRecorder.setCamera(camera);
         mMediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
-        mProfile = CamcorderProfile.get(cameraId, CamcorderProfile.QUALITY_HIGH);
+
-        // TODO: should get a profile of a quality compatible with the chosen size.
+        // Get a profile of quality compatible with the chosen size.
-        // Might do this by inspecting mResult.getSize(). However, it is not super important.
+        mSize = mResult.getRotation() % 180 != 0 ? mResult.getSize().flip() : mResult.getSize();
-        // We are only bound to respect the video size passed by the VideoSizeSelector, and
+        mProfile = CamcorderProfiles.get(cameraId, mSize);
-        // we are doing that below.
     }
 
     // Camera2 constructor here...
@@ -43,7 +43,6 @@ class FullVideoRecorder extends VideoRecorder {
             mMediaRecorder.setAudioSource(MediaRecorder.AudioSource.DEFAULT);
         }
 
-        Size size = mResult.getRotation() % 180 != 0 ? mResult.getSize().flip() : mResult.getSize();
         mMediaRecorder.setOutputFormat(mProfile.fileFormat);
         if (mResult.videoFrameRate <= 0) {
             mMediaRecorder.setVideoFrameRate(mProfile.videoFrameRate);
@@ -51,7 +50,7 @@ class FullVideoRecorder extends VideoRecorder {
         } else {
             mMediaRecorder.setVideoFrameRate(mResult.videoFrameRate);
         }
-        mMediaRecorder.setVideoSize(size.getWidth(), size.getHeight());
+        mMediaRecorder.setVideoSize(mSize.getWidth(), mSize.getHeight());
         switch (mResult.getVideoCodec()) {
             case H_263: mMediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.H263); break;
             case H_264: mMediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.H264); break;