Support building WebRTC without audio and video for Android

webrtc/sdk/android/src/jni/video_renderer_jni.cc

Index: webrtc/sdk/android/src/jni/video_renderer_jni.cc
diff --git a/webrtc/sdk/android/src/jni/video_renderer_jni.cc b/webrtc/sdk/android/src/jni/video_renderer_jni.cc
new file mode 100644
index 0000000000000000000000000000000000000000..b5af0003f94bf0bba3f12d87eafa56a162b05dcb
--- /dev/null
+++ b/webrtc/sdk/android/src/jni/video_renderer_jni.cc
@@ -0,0 +1,190 @@
+/*
+ *  Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include <jni.h>
+#undef JNIEXPORT
+#define JNIEXPORT __attribute__((visibility("default")))
+
+#include "webrtc/api/video/video_frame.h"
+#include "webrtc/media/base/videosinkinterface.h"
+#include "webrtc/sdk/android/src/jni/classreferenceholder.h"
+#include "webrtc/sdk/android/src/jni/jni_helpers.h"
+#include "webrtc/sdk/android/src/jni/native_handle_impl.h"
+
+namespace webrtc_jni {
+
+// Wrapper dispatching rtc::VideoSinkInterface to a Java VideoRenderer
+// instance.
+class JavaVideoRendererWrapper
+    : public rtc::VideoSinkInterface<webrtc::VideoFrame> {
+ public:
+  JavaVideoRendererWrapper(JNIEnv* jni, jobject j_callbacks)
+      : j_callbacks_(jni, j_callbacks),
+        j_render_frame_id_(
+            GetMethodID(jni,
+                        GetObjectClass(jni, j_callbacks),
+                        "renderFrame",
+                        "(Lorg/webrtc/VideoRenderer$I420Frame;)V")),
+        j_frame_class_(jni,
+                       FindClass(jni, "org/webrtc/VideoRenderer$I420Frame")),
+        j_i420_frame_ctor_id_(GetMethodID(jni,
+                                          *j_frame_class_,
+                                          "<init>",
+                                          "(III[I[Ljava/nio/ByteBuffer;J)V")),
+        j_texture_frame_ctor_id_(
+            GetMethodID(jni, *j_frame_class_, "<init>", "(IIII[FJ)V")),
+        j_byte_buffer_class_(jni, FindClass(jni, "java/nio/ByteBuffer")) {
+    CHECK_EXCEPTION(jni);
+  }
+
+  virtual ~JavaVideoRendererWrapper() {}
+
+  void OnFrame(const webrtc::VideoFrame& video_frame) override {
+    ScopedLocalRefFrame local_ref_frame(jni());
+
+    jobject j_frame;
+    if (video_frame.video_frame_buffer()->type() ==
+        webrtc::VideoFrameBuffer::Type::kNative) {
+      AndroidVideoFrameBuffer* android_buffer =
+          static_cast<AndroidVideoFrameBuffer*>(
+              video_frame.video_frame_buffer().get());
+      switch (android_buffer->android_type()) {
+        case AndroidVideoFrameBuffer::AndroidType::kTextureBuffer:
+          j_frame = ToJavaTextureFrame(&video_frame);
+          break;
+        case AndroidVideoFrameBuffer::AndroidType::kJavaBuffer:
+          j_frame = static_cast<AndroidVideoBuffer*>(android_buffer)
+                        ->ToJavaI420Frame(jni(), video_frame.width(),
+                                          video_frame.height(),
+                                          video_frame.rotation());
+          break;
+        default:
+          RTC_NOTREACHED();
+      }
+    } else {
+      j_frame = ToJavaI420Frame(&video_frame);
+    }
+    // |j_callbacks_| is responsible for releasing |j_frame| with
+    // VideoRenderer.renderFrameDone().
+    jni()->CallVoidMethod(*j_callbacks_, j_render_frame_id_, j_frame);
+    CHECK_EXCEPTION(jni());
+  }
+
+ private:
+  // Make a shallow copy of |frame| to be used with Java. The callee has
+  // ownership of the frame, and the frame should be released with
+  // VideoRenderer.releaseNativeFrame().
+  static jlong javaShallowCopy(const webrtc::VideoFrame* frame) {
+    return jlongFromPointer(new webrtc::VideoFrame(*frame));
+  }
+
+  // Return a VideoRenderer.I420Frame referring to the data in |frame|.
+  jobject ToJavaI420Frame(const webrtc::VideoFrame* frame) {
+    jintArray strides = jni()->NewIntArray(3);
+    jint* strides_array = jni()->GetIntArrayElements(strides, NULL);
+    rtc::scoped_refptr<webrtc::I420BufferInterface> i420_buffer =
+        frame->video_frame_buffer()->ToI420();
+    strides_array[0] = i420_buffer->StrideY();
+    strides_array[1] = i420_buffer->StrideU();
+    strides_array[2] = i420_buffer->StrideV();
+    jni()->ReleaseIntArrayElements(strides, strides_array, 0);
+    jobjectArray planes = jni()->NewObjectArray(3, *j_byte_buffer_class_, NULL);
+    jobject y_buffer = jni()->NewDirectByteBuffer(
+        const_cast<uint8_t*>(i420_buffer->DataY()),
+        i420_buffer->StrideY() * i420_buffer->height());
+    size_t chroma_height = i420_buffer->ChromaHeight();
+    jobject u_buffer =
+        jni()->NewDirectByteBuffer(const_cast<uint8_t*>(i420_buffer->DataU()),
+                                   i420_buffer->StrideU() * chroma_height);
+    jobject v_buffer =
+        jni()->NewDirectByteBuffer(const_cast<uint8_t*>(i420_buffer->DataV()),
+                                   i420_buffer->StrideV() * chroma_height);
+
+    jni()->SetObjectArrayElement(planes, 0, y_buffer);
+    jni()->SetObjectArrayElement(planes, 1, u_buffer);
+    jni()->SetObjectArrayElement(planes, 2, v_buffer);
+    return jni()->NewObject(*j_frame_class_, j_i420_frame_ctor_id_,
+                            frame->width(), frame->height(),
+                            static_cast<int>(frame->rotation()), strides,
+                            planes, javaShallowCopy(frame));
+  }
+
+  // Return a VideoRenderer.I420Frame referring texture object in |frame|.
+  jobject ToJavaTextureFrame(const webrtc::VideoFrame* frame) {
+    NativeHandleImpl handle =
+        static_cast<AndroidTextureBuffer*>(frame->video_frame_buffer().get())
+            ->native_handle_impl();
+    jfloatArray sampling_matrix = handle.sampling_matrix.ToJava(jni());
+
+    return jni()->NewObject(
+        *j_frame_class_, j_texture_frame_ctor_id_, frame->width(),
+        frame->height(), static_cast<int>(frame->rotation()),
+        handle.oes_texture_id, sampling_matrix, javaShallowCopy(frame));
+  }
+
+  JNIEnv* jni() { return AttachCurrentThreadIfNeeded(); }
+
+  ScopedGlobalRef<jobject> j_callbacks_;
+  jmethodID j_render_frame_id_;
+  ScopedGlobalRef<jclass> j_frame_class_;
+  jmethodID j_i420_frame_ctor_id_;
+  jmethodID j_texture_frame_ctor_id_;
+  ScopedGlobalRef<jclass> j_byte_buffer_class_;
+};
+
+JOW(void, VideoRenderer_freeWrappedVideoRenderer)(JNIEnv*, jclass, jlong j_p) {
+  delete reinterpret_cast<JavaVideoRendererWrapper*>(j_p);
+}
+
+JOW(void, VideoRenderer_releaseNativeFrame)
+(JNIEnv* jni, jclass, jlong j_frame_ptr) {
+  delete reinterpret_cast<const webrtc::VideoFrame*>(j_frame_ptr);
+}
+
+JOW(jlong, VideoRenderer_nativeWrapVideoRenderer)
+(JNIEnv* jni, jclass, jobject j_callbacks) {
+  std::unique_ptr<JavaVideoRendererWrapper> renderer(
+      new JavaVideoRendererWrapper(jni, j_callbacks));
+  return (jlong)renderer.release();
+}
+
+JOW(void, VideoRenderer_nativeCopyPlane)
+(JNIEnv* jni,
+ jclass,
+ jobject j_src_buffer,
+ jint width,
+ jint height,
+ jint src_stride,
+ jobject j_dst_buffer,
+ jint dst_stride) {
+  size_t src_size = jni->GetDirectBufferCapacity(j_src_buffer);
+  size_t dst_size = jni->GetDirectBufferCapacity(j_dst_buffer);
+  RTC_CHECK(src_stride >= width) << "Wrong source stride " << src_stride;
+  RTC_CHECK(dst_stride >= width) << "Wrong destination stride " << dst_stride;
+  RTC_CHECK(src_size >= src_stride * height)
+      << "Insufficient source buffer capacity " << src_size;
+  RTC_CHECK(dst_size >= dst_stride * height)
+      << "Insufficient destination buffer capacity " << dst_size;
+  uint8_t* src =
+      reinterpret_cast<uint8_t*>(jni->GetDirectBufferAddress(j_src_buffer));
+  uint8_t* dst =
+      reinterpret_cast<uint8_t*>(jni->GetDirectBufferAddress(j_dst_buffer));
+  if (src_stride == dst_stride) {
+    memcpy(dst, src, src_stride * height);
+  } else {
+    for (int i = 0; i < height; i++) {
+      memcpy(dst, src, width);
+      src += src_stride;
+      dst += dst_stride;
+    }
+  }
+}
+
+}  // namespace webrtc_jni