JNI wrapper for x264

LOCAL_PATH:= $(call my-dir)include $(CLEAR_VARS)LOCAL_MODULE    := x264LOCAL_SRC_FILES := $(LOCAL_PATH)/libx264.soinclude $(PREBUILT_SHARED_LIBRARY)include $(CLEAR_VARS)LOCAL_MODULE    := libgl2jni#LOCAL_CFLAGS    := -WerrorLOCAL_SRC_FILES := gl_code.cppLOCAL_LDLIBS    := -llog -lGLESv2

LOCAL_STATIC_LIBRARIES := libx264include $(BUILD_SHARED_LIBRARY)

以上是Android.mk,放在jni目录下面

注意：

作为第三方库，把libx264.so添加到Android中时，需要使用Android的内置宏：PREBUILT_SHARED_LIBRARY。该宏功能相当于将预编译好的由LOCAL_SRC_FILES指定的库文件，拷贝到指定目录下，（如果是Android源代码环境下编译，就拷贝到/system/lib/目录），对于应用程序，一般是先拷贝到obj/local/armeabi/，再拷贝到libs/armeabi/下面。

对于静态库，则使用PREBUILT_STATIC_LIBRARY。

下面是x264的jni wapper

#include <string.h>#include <jni.h>#include <stdio.h>#include <stdlib.h>#include <arpa/inet.h>//#include <x264.h>extern "C" {#include "x264.h"};#define DATA_MAX 3000000#define H264_MTU 1024typedef struct{    x264_param_t * param;    x264_t *handle;    x264_picture_t * picture;    x264_nal_t  *nal;} Encoder;jlong Java_h264_com_H264Encoder_CompressBegin(JNIEnv* env, jobject thiz,        jint width, jint height) {    Encoder * en = (Encoder *) malloc(sizeof(Encoder));    en->param = (x264_param_t *) malloc(sizeof(x264_param_t));    en->picture = (x264_picture_t *) malloc(sizeof(x264_picture_t));    x264_param_default(en->param); //set default param    //en->param->rc.i_rc_method = X264_RC_CQP;    en->param->i_log_level = X264_LOG_NONE;    en->param->i_width = width; //set frame width    en->param->i_height = height; //set frame height    en->param->rc.i_lookahead =0;    en->param->i_bframe=0;    en->param->i_fps_num =5;    en->param->i_fps_den = 1;    if ((en->handle = x264_encoder_open(en->param)) == 0) {        return 0;    }    /* Create a new pic */    x264_picture_alloc(en->picture, X264_CSP_I420, en->param->i_width,            en->param->i_height);    return (jlong) en;}jint Java_h264_com_H264Encoder_CompressEnd(JNIEnv* env, jobject thiz,jlong handle){    Encoder * en = (Encoder *) handle;    if(en->picture)    {        x264_picture_clean(en->picture);        free(en->picture);        en->picture    = 0;    }    if(en->param)    {        free(en->param);        en->param=0;    }    if(en->handle)    {        x264_encoder_close(en->handle);    }    free(en);    return 0;}jint Java_h264_com_H264Encoder_CompressBuffer(JNIEnv* env, jobject thiz,jlong handle,jint type,jbyteArray in, jint insize,jbyteArray out){    Encoder * en = (Encoder *) handle;    x264_picture_t pic_out;    int i_data=0;    int nNal=-1;    int result=0;    int i=0,j=0;    int nPix=0;    jboolean isCopy = false;    jbyte * Buf = (jbyte*)(*env).GetByteArrayElements(in, &isCopy);    jbyte * h264Buf = (jbyte*)(*env).GetByteArrayElements(out, &isCopy);    unsigned char * pTmpOut = (unsigned char *)h264Buf;    int nPicSize=en->param->i_width*en->param->i_height;    /*    Y鏁版嵁鍏ㄩ儴浠庡湪涓€鍧楋紝UV鏁版嵁浣跨敤interleave鏂瑰紡瀛樺偍    YYYY    YYYY    UVUV     */    jbyte * y=(jbyte *)en->picture->img.plane[0];    jbyte * v=(jbyte *)en->picture->img.plane[1];    jbyte * u=(jbyte *)en->picture->img.plane[2];    memcpy(en->picture->img.plane[0],Buf,nPicSize);    for (i=0;i<nPicSize/4;i++)    {        *(u+i)=*(Buf+nPicSize+i*2);        *(v+i)=*(Buf+nPicSize+i*2+1);    }    switch (type)    {    case 0:        en->picture->i_type = X264_TYPE_P;        break;    case 1:        en->picture->i_type = X264_TYPE_IDR;        break;    case 2:        en->picture->i_type = X264_TYPE_I;        break;    default:        en->picture->i_type = X264_TYPE_AUTO;        break;    }    if( x264_encoder_encode( en->handle, &(en->nal), &nNal, en->picture ,&pic_out) < 0 )    {        return -1;    }    for (i = 0; i < nNal; i++){          memcpy(pTmpOut, en->nal[i].p_payload, en->nal[i].i_payload);          pTmpOut += en->nal[i].i_payload;          result+=en->nal[i].i_payload;    }    return result;}