Hide AndroidVideoBuffer class and use factory function

This is a step to ensure that the Java to C++ Video Frame Buffer
conversion respects its types.

Bug: webrtc:12602
Change-Id: I1b688b1f421f44474e022b433f9075e75744d86f
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/223082
Reviewed-by: Xavier Lepaul‎ <xalep@webrtc.org>
Commit-Queue: Xavier Lepaul‎ <xalep@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#34487}

sdk/android/src/jni/android_video_track_source.cc

@@ -10,11 +10,11 @@
 
 #include "sdk/android/src/jni/android_video_track_source.h"
 
-#include "sdk/android/generated_video_jni/NativeAndroidVideoTrackSource_jni.h"
-
 #include <utility>
 
 #include "rtc_base/logging.h"
+#include "sdk/android/generated_video_jni/NativeAndroidVideoTrackSource_jni.h"
+#include "sdk/android/src/jni/video_frame.h"
 
 namespace webrtc {
 namespace jni {
@@ -132,7 +132,7 @@ void AndroidVideoTrackSource::OnFrameCaptured(
     jlong j_timestamp_ns,
     const JavaRef<jobject>& j_video_frame_buffer) {
   rtc::scoped_refptr<VideoFrameBuffer> buffer =
-      AndroidVideoBuffer::Create(env, j_video_frame_buffer);
+      JavaToNativeFrameBuffer(env, j_video_frame_buffer);
   const VideoRotation rotation = jintToVideoRotation(j_rotation);
 
   // AdaptedVideoTrackSource handles applying rotation for I420 frames.

sdk/android/src/jni/android_video_track_source.h

@@ -18,7 +18,7 @@
 #include "rtc_base/checks.h"
 #include "rtc_base/thread.h"
 #include "rtc_base/timestamp_aligner.h"
-#include "sdk/android/src/jni/video_frame.h"
+#include "sdk/android/src/jni/jni_helpers.h"
 
 namespace webrtc {
 namespace jni {

sdk/android/src/jni/video_encoder_wrapper.cc

@@ -27,6 +27,7 @@
 #include "sdk/android/native_api/jni/java_types.h"
 #include "sdk/android/src/jni/encoded_image.h"
 #include "sdk/android/src/jni/video_codec_status.h"
+#include "sdk/android/src/jni/video_frame.h"
 
 namespace webrtc {
 namespace jni {

sdk/android/src/jni/video_encoder_wrapper.h

@@ -25,7 +25,6 @@
 #include "modules/video_coding/svc/scalable_video_controller_no_layering.h"
 #include "rtc_base/synchronization/mutex.h"
 #include "sdk/android/src/jni/jni_helpers.h"
-#include "sdk/android/src/jni/video_frame.h"
 
 namespace webrtc {
 namespace jni {

sdk/android/src/jni/video_frame.cc

@@ -10,12 +10,8 @@
 
 #include "sdk/android/src/jni/video_frame.h"
 
-#include <memory>
-
 #include "api/scoped_refptr.h"
 #include "common_video/include/video_frame_buffer.h"
-#include "rtc_base/checks.h"
-#include "rtc_base/logging.h"
 #include "rtc_base/ref_counted_object.h"
 #include "rtc_base/time_utils.h"
 #include "sdk/android/generated_video_jni/VideoFrame_jni.h"
@@ -27,6 +23,51 @@ namespace jni {
 
 namespace {
 
+class AndroidVideoBuffer : public VideoFrameBuffer {
+ public:
+  // Creates a native VideoFrameBuffer from a Java VideoFrame.Buffer.
+  static rtc::scoped_refptr<AndroidVideoBuffer> Create(
+      JNIEnv* jni,
+      const JavaRef<jobject>& j_video_frame_buffer);
+
+  // Similar to the Create() above, but adopts and takes ownership of the Java
+  // VideoFrame.Buffer. I.e. retain() will not be called, but release() will be
+  // called when the returned AndroidVideoBuffer is destroyed.
+  static rtc::scoped_refptr<AndroidVideoBuffer> Adopt(
+      JNIEnv* jni,
+      const JavaRef<jobject>& j_video_frame_buffer);
+
+  ~AndroidVideoBuffer() override;
+
+  const ScopedJavaGlobalRef<jobject>& video_frame_buffer() const;
+
+  // Crops a region defined by |crop_x|, |crop_y|, |crop_width| and
+  // |crop_height|. Scales it to size |scale_width| x |scale_height|.
+  rtc::scoped_refptr<VideoFrameBuffer> CropAndScale(int crop_x,
+                                                    int crop_y,
+                                                    int crop_width,
+                                                    int crop_height,
+                                                    int scale_width,
+                                                    int scale_height) override;
+
+ protected:
+  // Should not be called directly. Adopts the Java VideoFrame.Buffer. Use
+  // Create() or Adopt() instead for clarity.
+  AndroidVideoBuffer(JNIEnv* jni, const JavaRef<jobject>& j_video_frame_buffer);
+
+ private:
+  Type type() const override;
+  int width() const override;
+  int height() const override;
+
+  rtc::scoped_refptr<I420BufferInterface> ToI420() override;
+
+  const int width_;
+  const int height_;
+  // Holds a VideoFrame.Buffer.
+  const ScopedJavaGlobalRef<jobject> j_video_frame_buffer_;
+};
+
 class AndroidVideoI420Buffer : public I420BufferInterface {
  public:
   // Adopts and takes ownership of the Java VideoFrame.Buffer. I.e. retain()
@@ -189,6 +230,12 @@ rtc::scoped_refptr<I420BufferInterface> AndroidVideoBuffer::ToI420() {
   return AndroidVideoI420Buffer::Adopt(jni, width_, height_, j_i420_buffer);
 }
 
+rtc::scoped_refptr<VideoFrameBuffer> JavaToNativeFrameBuffer(
+    JNIEnv* jni,
+    const JavaRef<jobject>& j_video_frame_buffer) {
+  return AndroidVideoBuffer::Create(jni, j_video_frame_buffer);
+}
+
 VideoFrame JavaToNativeFrame(JNIEnv* jni,
                              const JavaRef<jobject>& j_video_frame,
                              uint32_t timestamp_rtp) {

sdk/android/src/jni/video_frame.h

@@ -15,56 +15,14 @@
 
 #include "api/video/video_frame.h"
 #include "api/video/video_frame_buffer.h"
-#include "api/video/video_rotation.h"
 #include "sdk/android/src/jni/jni_helpers.h"
 
 namespace webrtc {
 namespace jni {
 
-class AndroidVideoBuffer : public VideoFrameBuffer {
- public:
-  // Creates a native VideoFrameBuffer from a Java VideoFrame.Buffer.
-  static rtc::scoped_refptr<AndroidVideoBuffer> Create(
-      JNIEnv* jni,
-      const JavaRef<jobject>& j_video_frame_buffer);
-
-  // Similar to the Create() above, but adopts and takes ownership of the Java
-  // VideoFrame.Buffer. I.e. retain() will not be called, but release() will be
-  // called when the returned AndroidVideoBuffer is destroyed.
-  static rtc::scoped_refptr<AndroidVideoBuffer> Adopt(
-      JNIEnv* jni,
-      const JavaRef<jobject>& j_video_frame_buffer);
-
-  ~AndroidVideoBuffer() override;
-
-  const ScopedJavaGlobalRef<jobject>& video_frame_buffer() const;
-
-  // Crops a region defined by |crop_x|, |crop_y|, |crop_width| and
-  // |crop_height|. Scales it to size |scale_width| x |scale_height|.
-  rtc::scoped_refptr<VideoFrameBuffer> CropAndScale(int crop_x,
-                                                    int crop_y,
-                                                    int crop_width,
-                                                    int crop_height,
-                                                    int scale_width,
-                                                    int scale_height) override;
-
- protected:
-  // Should not be called directly. Adopts the Java VideoFrame.Buffer. Use
-  // Create() or Adopt() instead for clarity.
-  AndroidVideoBuffer(JNIEnv* jni, const JavaRef<jobject>& j_video_frame_buffer);
-
- private:
-  Type type() const override;
-  int width() const override;
-  int height() const override;
-
-  rtc::scoped_refptr<I420BufferInterface> ToI420() override;
-
-  const int width_;
-  const int height_;
-  // Holds a VideoFrame.Buffer.
-  const ScopedJavaGlobalRef<jobject> j_video_frame_buffer_;
-};
+rtc::scoped_refptr<VideoFrameBuffer> JavaToNativeFrameBuffer(
+    JNIEnv* jni,
+    const JavaRef<jobject>& j_video_frame_buffer);
 
 VideoFrame JavaToNativeFrame(JNIEnv* jni,
                              const JavaRef<jobject>& j_video_frame,