开发学院软件开发Java 流媒体程序开发之:H264解码器移植到OPhone 阅读

流媒体程序开发之:H264解码器移植到OPhone

 2009-09-22 00:00:00 来源:WEB开发网   
核心提示: 5.3.2实现本地方法之前已经生成了JNI头文件,接下来只需要实现这个头文件的几个导出函数,流媒体程序开发之:H264解码器移植到OPhone(4),这里以H264解码器的实现为例:#include"ophone_streaming_video_h264_H264decode.h&qu

5.3.2 实现本地方法

之前已经生成了JNI头文件,接下来只需要实现这个头文件的几个导出函数,这里以H264解码器的实现为例:

#include "ophone_streaming_video_h264_H264decode.h"  
#include "H264Decode.h"  
  
JNIEXPORT jint JNICALL Java_ophone_streaming_video_h264_H264decode_DecodeOneFrame  
  (JNIEnv * env, jclass obj, jlong decode, jobject pInBuffer, jobject pOutBuffer) {  
  
    H264Decode *pDecode = (H264Decode *)decode;  
    unsigned char *In = NULL;unsigned char *Out = NULL;  
    unsigned int InPosition = 0;unsigned int InRemaining = 0;unsigned int InSize = 0;  
    unsigned int OutSize = 0;  
    jint DecodeSize = -1;  
  
    jbyte *InJbyte = 0;  
    jbyte *OutJbyte = 0;  
  
    jbyteArray InByteArrary = 0;  
    jbyteArray OutByteArrary = 0;  
  
    //获取Input/Out ByteBuffer相关属性  
    {  
        //Input  
        {  
            jclass ByteBufferClass = env->GetObjectClass(pInBuffer);  
            jmethodID PositionMethodId = env->GetMethodID(ByteBufferClass,"position","()I");  
            jmethodID RemainingMethodId = env->GetMethodID(ByteBufferClass,"remaining","()I");  
            jmethodID ArraryMethodId = env->GetMethodID(ByteBufferClass,"array","()[B");  
              
            InPosition = env->CallIntMethod(pInBuffer,PositionMethodId);  
            InRemaining = env->CallIntMethod(pInBuffer,RemainingMethodId);  
            InSize = InPosition + InRemaining;  
              
            InByteArrary = (jbyteArray)env->CallObjectMethod(pInBuffer,ArraryMethodId);  
          
            InJbyte = env->GetByteArrayElements(InByteArrary,0);  
              
            In = (unsigned char*)InJbyte + InPosition;  
        }  
  
        //Output  
        {  
            jclass ByteBufferClass = env->GetObjectClass(pOutBuffer);  
            jmethodID ArraryMethodId = env->GetMethodID(ByteBufferClass,"array","()[B");  
            jmethodID ClearMethodId = env->GetMethodID(ByteBufferClass,"clear","()Ljava/nio/Buffer;");  
              
            //清理输出缓存区  
            env->CallObjectMethod(pOutBuffer,ClearMethodId);  
  
            OutByteArrary = (jbyteArray)env->CallObjectMethod(pOutBuffer,ArraryMethodId);  
            OutJbyte = env->GetByteArrayElements(OutByteArrary,0);  
  
            Out = (unsigned char*)OutJbyte;  
        }  
    }  
  
    //解码  
    DecodeSize = pDecode->DecodeOneFrame(In,InRemaining,Out,OutSize);  
  
    //设置Input/Output ByteBuffer相关属性  
    {  
        //Input  
        {  
            jclass ByteBufferClass = env->GetObjectClass(pInBuffer);  
            jmethodID SetPositionMethodId = env->GetMethodID(ByteBufferClass,"position","(I)Ljava/nio/Buffer;");  
              
            //设置输入缓冲区偏移  
            env->CallObjectMethod(pInBuffer,SetPositionMethodId,InPosition + DecodeSize);  
        }  
  
        //Output  
        {  
            jclass ByteBufferClass = env->GetObjectClass(pOutBuffer);  
            jmethodID SetPositionMethodId = env->GetMethodID(ByteBufferClass,"position","(I)Ljava/nio/Buffer;");  
  
            //设置输出缓冲区偏移  
            env->CallObjectMethod(pOutBuffer,SetPositionMethodId,OutSize);  
        }  
    }  
  
    //清理  
    env->ReleaseByteArrayElements(InByteArrary,InJbyte,0);  
    env->ReleaseByteArrayElements(OutByteArrary,OutJbyte,0);  
  
    return DecodeSize;  
}  
  
JNIEXPORT jlong JNICALL Java_ophone_streaming_video_h264_H264decode_Initialize  
  (JNIEnv * env, jclass obj) {  
  
    H264Decode *pDecode = H264Decode::H264DecodeConstruct();  
    return (jlong)pDecode;  
}  
  
JNIEXPORT void JNICALL Java_ophone_streaming_video_h264_H264decode_Destroy  
  (JNIEnv * env, jclass obj, jlong decode) {  
  
    H264Decode *pDecode = (H264Decode *)decode;  
    if (pDecode)  
    {  
        delete pDecode;  
        pDecode = NULL;  
    }  
} 
 

上一页  1 2 3 4 5 6 7  下一页

Tags:流媒体 程序开发 解码器

编辑录入:爽爽 [复制链接] [打 印]
[]
  • 好
  • 好的评价 如果觉得好,就请您
      0%(0)
  • 差
  • 差的评价 如果觉得差,就请您
      0%(0)
赞助商链接