1 /*
2 * Copyright 2017 The WebRTC project authors. All Rights Reserved.
3 *
4 * Use of this source code is governed by a BSD-style license
5 * that can be found in the LICENSE file in the root of the source
6 * tree. An additional intellectual property rights grant can be found
7 * in the file PATENTS. All contributing project authors may
8 * be found in the AUTHORS file in the root of the source tree.
9 */
10
11 #include <jni.h>
12 #include <vector>
13
14 #include "third_party/libyuv/include/libyuv/convert.h"
15 #include "third_party/libyuv/include/libyuv/scale.h"
16
17 #include "common_video/libyuv/include/webrtc_libyuv.h"
18 #include "rtc_base/checks.h"
19 #include "sdk/android/generated_video_jni/NV21Buffer_jni.h"
20
21 namespace webrtc {
22 namespace jni {
23
JNI_NV21Buffer_CropAndScale(JNIEnv * jni,jint crop_x,jint crop_y,jint crop_width,jint crop_height,jint scale_width,jint scale_height,const JavaParamRef<jbyteArray> & j_src,jint src_width,jint src_height,const JavaParamRef<jobject> & j_dst_y,jint dst_stride_y,const JavaParamRef<jobject> & j_dst_u,jint dst_stride_u,const JavaParamRef<jobject> & j_dst_v,jint dst_stride_v)24 static void JNI_NV21Buffer_CropAndScale(JNIEnv* jni,
25 jint crop_x,
26 jint crop_y,
27 jint crop_width,
28 jint crop_height,
29 jint scale_width,
30 jint scale_height,
31 const JavaParamRef<jbyteArray>& j_src,
32 jint src_width,
33 jint src_height,
34 const JavaParamRef<jobject>& j_dst_y,
35 jint dst_stride_y,
36 const JavaParamRef<jobject>& j_dst_u,
37 jint dst_stride_u,
38 const JavaParamRef<jobject>& j_dst_v,
39 jint dst_stride_v) {
40 const int src_stride_y = src_width;
41 const int src_stride_uv = src_width;
42 const int crop_chroma_x = crop_x / 2;
43 const int crop_chroma_y = crop_y / 2;
44
45 jboolean was_copy;
46 jbyte* src_bytes = jni->GetByteArrayElements(j_src.obj(), &was_copy);
47 RTC_DCHECK(!was_copy);
48 uint8_t const* src_y = reinterpret_cast<uint8_t const*>(src_bytes);
49 uint8_t const* src_uv = src_y + src_height * src_stride_y;
50
51 uint8_t* dst_y =
52 static_cast<uint8_t*>(jni->GetDirectBufferAddress(j_dst_y.obj()));
53 uint8_t* dst_u =
54 static_cast<uint8_t*>(jni->GetDirectBufferAddress(j_dst_u.obj()));
55 uint8_t* dst_v =
56 static_cast<uint8_t*>(jni->GetDirectBufferAddress(j_dst_v.obj()));
57
58 // Crop using pointer arithmetic.
59 src_y += crop_x + crop_y * src_stride_y;
60 src_uv += 2 * crop_chroma_x + crop_chroma_y * src_stride_uv;
61
62 NV12ToI420Scaler scaler;
63 // U- and V-planes are swapped because this is NV21 not NV12.
64 scaler.NV12ToI420Scale(src_y, src_stride_y, src_uv, src_stride_uv, crop_width,
65 crop_height, dst_y, dst_stride_y, dst_v, dst_stride_v,
66 dst_u, dst_stride_u, scale_width, scale_height);
67
68 jni->ReleaseByteArrayElements(j_src.obj(), src_bytes, JNI_ABORT);
69 }
70
71 } // namespace jni
72 } // namespace webrtc
73