现在开始使用之前编译的ffmpeg解码H264文件，之前编译ffmpeg的步骤点击进入
一：把之前编译好的ffmpeg.so放入ndk的安装目录……platforms/android-3/arch-arm/usr/lib下
二：以h264_project/jni形式新建一个工程，把ffmpeg源码放到jni目录下（因为需要用到里面的很多h文件）
三：在jni目录下编写H264Android.c文件，内容如下：（该文件中的函数名是通过java中的native方法而来的，请自行命名，有关如何生成该文件请查看ndk中hello-jni例子）
/* DO NOT EDIT THIS FILE – it is machine generated */#include <string.h>#include <jni.h>#include <stdio.h>#include <stdlib.h>#include <ffmpeg/libavutil/common.h>#include <ffmpeg/libavcodec/avcodec.h>struct AVCodec *codec=NULL;// Codecstruct AVCodecContext *c=NULL; // Codec Contextstruct AVFrame *picture=NULL; // Frameint iWidth=0;int iHeight=0;int *colortab=NULL;int *u_b_tab=NULL;int *u_g_tab=NULL;int *v_g_tab=NULL;int *v_r_tab=NULL;//short *tmp_pic=NULL;unsigned int *rgb_2_pix=NULL;unsigned int *r_2_pix=NULL;unsigned int *g_2_pix=NULL;unsigned int *b_2_pix=NULL;void DeleteYUVTab(){//av_free(tmp_pic);av_free(colortab);av_free(rgb_2_pix);}void CreateYUVTab_16(){int i;int u, v;//tmp_pic = (short*)av_malloc(iWidth*iHeight*2); // 缓存 iWidth * iHeight * 16bitscolortab = (int *)av_malloc(4*256*sizeof(int));u_b_tab = &colortab[0*256];u_g_tab = &colortab[1*256];v_g_tab = &colortab[2*256];v_r_tab = &colortab[3*256];for (i=0; i<256; i++){u = v = (i-128);u_b_tab[i] = (int) ( 1.772 * u);u_g_tab[i] = (int) ( 0.34414 * u);v_g_tab[i] = (int) ( 0.71414 * v);v_r_tab[i] = (int) ( 1.402 * v);}rgb_2_pix = (unsigned int *)av_malloc(3*768*sizeof(unsigned int));r_2_pix = &rgb_2_pix[0*768];g_2_pix = &rgb_2_pix[1*768];b_2_pix = &rgb_2_pix[2*768];for(i=0; i<256; i++){r_2_pix[i] = 0;g_2_pix[i] = 0;b_2_pix[i] = 0;}for(i=0; i<256; i++){r_2_pix[i+256] = (i & 0xF8) << 8;g_2_pix[i+256] = (i & 0xFC) << 3;b_2_pix[i+256] = (i ) >> 3;}for(i=0; i<256; i++){r_2_pix[i+512] = 0xF8 << 8;g_2_pix[i+512] = 0xFC << 3;b_2_pix[i+512] = 0x1F;}r_2_pix += 256;g_2_pix += 256;b_2_pix += 256;}void DisplayYUV_16(unsigned int *pdst1, unsigned char *y, unsigned char *u, unsigned char *v, int width, int height, int src_ystride, int src_uvstride, int dst_ystride){int i, j;int r, g, b, rgb;int yy, ub, ug, vg, vr;unsigned char* yoff;unsigned char* uoff;unsigned char* voff;unsigned int* pdst=pdst1;int width2 = width/2;int height2 = height/2;if(width2>iWidth/2){width2=iWidth/2;y+=(width-iWidth)/4*2;u+=(width-iWidth)/4;v+=(width-iWidth)/4;}if(height2>iHeight)height2=iHeight;for(j=0; j<height2; j++) // 一次2×2共四个像素{yoff = y + j * 2 * src_ystride;uoff = u + j * src_uvstride;voff = v + j * src_uvstride;for(i=0; i<width2; i++){yy = *(yoff+(i<<1));ub = u_b_tab[*(uoff+i)];ug = u_g_tab[*(uoff+i)];vg = v_g_tab[*(voff+i)];vr = v_r_tab[*(voff+i)];b = yy + ub;g = yy – ug – vg;r = yy + vr;rgb = r_2_pix[r] + g_2_pix[g] + b_2_pix[b];yy = *(yoff+(i<<1)+1);b = yy + ub;g = yy – ug – vg;r = yy + vr;pdst[(j*dst_ystride+i)] = (rgb)+((r_2_pix[r] + g_2_pix[g] + b_2_pix[b])<<16);yy = *(yoff+(i<<1)+src_ystride);b = yy + ub;g = yy – ug – vg;r = yy + vr;rgb = r_2_pix[r] + g_2_pix[g] + b_2_pix[b];yy = *(yoff+(i<<1)+src_ystride+1);b = yy + ub;g = yy – ug – vg;r = yy + vr;pdst [((2*j+1)*dst_ystride+i*2)>>1] = (rgb)+((r_2_pix[r] + g_2_pix[g] + b_2_pix[b])<<16);}}}/* * Class:com_zhutieju_testservice_H264Android * Method: initDecoder * Signature: (II)I */JNIEXPORT jint JNICALL Java_com_zhutieju_testservice_H264Android_initDecoder (JNIEnv* env, jobject thiz, jint width, jint height){iWidth = width;iHeight = height;CreateYUVTab_16();avcodec_init();avcodec_register_all();//找到H264解码器codec = avcodec_find_decoder(CODEC_ID_H264);//分配解码器内存c = avcodec_alloc_context();//打开解码器avcodec_open(c,codec);//给解码器解码后的帧数据分配存储空间picture = avcodec_alloc_frame();//picture= malloc(sizeof(AVFrame));return 1;}/* * Class:com_zhutieju_testservice_H264Android * Method: dalDecoder * Signature: ([BI[B)I */JNIEXPORT jint JNICALL Java_com_zhutieju_testservice_H264Android_dalDecoder (JNIEnv* env, jobject thiz, jbyteArray in, jint nalLen, jbyteArray out){int i;int imod;int got_picture=0;jbyte * Buf = (jbyte*)(*env)->GetByteArrayElements(env, in, 0);jbyte * Pixel= (jbyte*)(*env)->GetByteArrayElements(env, out, 0);int consumed_bytes = avcodec_decode_video(c, picture, &got_picture, Buf, nalLen);if(got_picture > 0){DisplayYUV_16((int*)Pixel, picture->data[0], picture->data[1], picture->data[2], c->width, c->height, picture->linesize[0], picture->linesize[1], iWidth);/*for(i=0; i<c->height; i++)fwrite(picture->data[0] + i * picture->linesize[0], 1, c->width, outf);for(i=0; i<c->height/2; i++)fwrite(picture->data[1] + i * picture->linesize[1], 1, c->width/2, outf);for(i=0; i<c->height/2; i++)fwrite(picture->data[2] + i * picture->linesize[2], 1, c->width/2, outf);// */}(*env)->ReleaseByteArrayElements(env, in, Buf, 0);(*env)->ReleaseByteArrayElements(env, out, Pixel, 0);return consumed_bytes;}/* * Class:com_zhutieju_testservice_H264Android * Method: releaseDecoder * Signature: ()I */JNIEXPORT jint JNICALL Java_com_zhutieju_testservice_H264Android_releaseDecoder (JNIEnv* env, jobject thiz){if(c){avcodec_close(c);free(c->priv_data);free(c);c = NULL;}if(picture){free(picture);picture = NULL;}DeleteYUVTab();return 1;}
以上方法说明：
你说只有有缘人才可以取下，我看着你手中的戒指，
