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| 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 "webrtc/rtc_base/checks.h" |
| 18 |
| 19 namespace webrtc_jni { |
| 20 |
| 21 extern "C" JNIEXPORT void JNICALL |
| 22 Java_org_webrtc_NV12Buffer_nativeCropAndScale(JNIEnv* jni, |
| 23 jclass, |
| 24 jint crop_x, |
| 25 jint crop_y, |
| 26 jint crop_width, |
| 27 jint crop_height, |
| 28 jint scale_width, |
| 29 jint scale_height, |
| 30 jobject j_src, |
| 31 jint src_width, |
| 32 jint src_height, |
| 33 jint src_stride, |
| 34 jint src_slice_height, |
| 35 jobject j_dst_y, |
| 36 jint dst_stride_y, |
| 37 jobject j_dst_u, |
| 38 jint dst_stride_u, |
| 39 jobject j_dst_v, |
| 40 jint dst_stride_v) { |
| 41 const int src_stride_y = src_stride; |
| 42 const int src_stride_uv = src_stride; |
| 43 const int crop_chroma_x = crop_x / 2; |
| 44 const int crop_chroma_y = crop_y / 2; |
| 45 const int crop_chroma_width = (crop_width + 1) / 2; |
| 46 const int crop_chroma_height = (crop_height + 1) / 2; |
| 47 const int tmp_stride_u = crop_chroma_width; |
| 48 const int tmp_stride_v = crop_chroma_width; |
| 49 const int tmp_size = crop_chroma_height * (tmp_stride_u + tmp_stride_v); |
| 50 |
| 51 uint8_t const* src_y = |
| 52 static_cast<uint8_t const*>(jni->GetDirectBufferAddress(j_src)); |
| 53 uint8_t const* src_uv = src_y + src_slice_height * src_stride_y; |
| 54 |
| 55 uint8_t* dst_y = static_cast<uint8_t*>(jni->GetDirectBufferAddress(j_dst_y)); |
| 56 uint8_t* dst_u = static_cast<uint8_t*>(jni->GetDirectBufferAddress(j_dst_u)); |
| 57 uint8_t* dst_v = static_cast<uint8_t*>(jni->GetDirectBufferAddress(j_dst_v)); |
| 58 |
| 59 // Crop using pointer arithmetic. |
| 60 src_y += crop_x + crop_y * src_stride_y; |
| 61 src_uv += crop_chroma_x + crop_chroma_y * src_stride_uv; |
| 62 |
| 63 std::vector<uint8_t> tmp_buffer(tmp_size); |
| 64 uint8_t* tmp_u = tmp_buffer.data(); |
| 65 uint8_t* tmp_v = tmp_u + crop_chroma_height * tmp_stride_u; |
| 66 |
| 67 libyuv::SplitUVPlane(src_uv, src_stride_uv, tmp_u, tmp_stride_u, tmp_v, |
| 68 tmp_stride_v, crop_chroma_width, crop_chroma_height); |
| 69 |
| 70 libyuv::I420Scale(src_y, src_stride_y, tmp_u, tmp_stride_u, tmp_v, |
| 71 tmp_stride_v, crop_width, crop_height, dst_y, dst_stride_y, |
| 72 dst_u, dst_stride_u, dst_v, dst_stride_v, scale_width, |
| 73 scale_height, libyuv::kFilterBox); |
| 74 } |
| 75 |
| 76 } // namespace webrtc_jni |
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