YUV420spとYUV420p間の相互変換

JNIEXPORT jbyteArray JNICALL 
Java_com_uestc_smileteeth_view_recordvideo_RecordVideoLib_YUV420spToYUV420p（JNIEnv * env、
                                                                            jclass type、
                                                                            jbyteArray yuv420sp_、
                                                                            jint width、
                                                                            jint height）{ 
    jbyte * yuv420sp =（* env）-> GetByteArrayElements（env、yuv420sp）

    jbyteArray yuv420pRet =（* env）-> NewByteArray（env、（* env）-> GetArrayLength（env、yuv420sp_））; 
    jbyte* yuv420p =（* env）-> GetByteArrayElements（env、yuv420pRet、NULL）;
    int i、j;
    int y_size =幅* 高さ; 

    unsigned char * y = yuv420sp; 
    unsigned char * vu = yuv420sp + y_size; 

    unsigned char * y_tmp = yuv420p; 
    unsigned char * u_tmp = yuv420p + y_size; 
    符号なしのchar * v_tmp = YUV420P + Y_SIZE * 5 / 4 。

    // y 
    memcpy（y_tmp、y、y_size）; 

    // v、u 
    for（j =0、i = 0 ; j <y_size / 2 ; j + = 2、i ++ ）{ 
        v_tmp [i] = vu [j]; 
        u_tmp [i] = vu [j + 1 ]; 
    } 

    （ * env）-> ReleaseByteArrayElements（env、yuv420sp_、yuv420sp、0 ）; 
    （ * env）-> ReleaseByteArrayElements（env、yuv420pRet、yuv420p、0 ）;
    yuv420pRetを返します。
}

yuv420pからyuv420sp

JNIEXPORT jbyteArray JNICALL 
Java_com_uestc_smileteeth_view_recordvideo_RecordVideoLib_YUV420pToYUV420sp（JNIEnv * env、
                                                                            jclass type、
                                                                            jbyteArray yuv420p_、
                                                                            jint width、
                                                                            jint height）{ 
    jbyte * yuv420p =（* env）-> GetByteArrayElements（env、yuv420p 

    jbyteArray yuv420spRet =（* env）-> NewByteArray（env、（* env）-> GetArrayLength（env、yuv420p_））; 
    jbyte* yuv420sp =（* env）-> GetByteArrayElements（env、yuv420spRet、NULL）;
    int i、j;
    int y_size =幅* 高さ; 

    unsigned char * y = yuv420sp; 
    unsigned char * vu = yuv420sp + y_size; 

    unsigned char * y_tmp = yuv420p; 
    unsigned char * u_tmp = yuv420p + y_size; 
    符号なしのchar * v_tmp = YUV420P + Y_SIZE * 5 / 4 。

    // y 
    memcpy（y、y_tmp、y_size）; 

    // v、u 
    for（j =0、i = 0 ; j <y_size / 2 ; j + = 2、i ++ ）{ 
        vu [j] = v_tmp [i]; 
        vu [j + 1 ] = u_tmp [i]; 
    } 

    （ * env）-> ReleaseByteArrayElements（env、yuv420p_、yuv420p、0 ）; 
    （ * env）-> ReleaseByteArrayElements（env、yuv420spRet、yuv420sp、0 ）;
    返すyuv420spRetを。
}

元のリンク：https://blog.csdn.net/Emily2015/article/details/79271199