庆祝一下，Android视频采集+H264编码成功

编码器使用的是x264的开源库，

很容易看懂的

简单的封装了一个JNI库

编码库在BBS里 CSDN的资源太难用了

http://www.eoeandroid.com/forum.php?mod=viewthread&tid=52739&extra=

x264的编译放方法

export ARM_ROOT=$ANDROID_NDK_ROOT
export ARM_INC=$ARM_ROOT/build/platforms/android-5/arch-arm/usr/include/
export ARM_LIB=$ARM_ROOT/build/platforms/android-5/arch-arm/usr/lib/
export ARM_TOOL=$ARM_ROOT/build/prebuilt/windows/arm-eabi-4.4.0
export ARM_LIBO=$ARM_TOOL/lib/gcc/arm-eabi/4.4.0
export PATH=$ARM_TOOL/bin:$PATH
export ARM_PRE=arm-eabi

./configure --prefix=/home/egmkang/libx264 --enable-shared /
-disable-asm --host=arm-linux --cross-prefix=arm-eabi-/
--extra-cflags=" -I$ARM_INC -fPIC -DANDROID -fpic -mthumb-interwork -ffunction-sections -funwind-tables -fstack-protector -fno-short-enums -D__ARM_ARCH_5__ -D__ARM_ARCH_5T__ -D__ARM_ARCH_5E__ -D__ARM_ARCH_5TE__ -Wno-psabi -march=armv5te -mtune=xscale -msoft-float -mthumb -Os -fomit-frame-pointer -fno-strict-aliasing -finline-limit=64 -DANDROID -Wa,--noexecstack -MMD -MP "/
--extra-ldflags="-nostdlib -Bdynamic -Wl,--no-undefined -Wl,-z,noexecstack -Wl,-z,nocopyreloc -Wl,-soname,/system/lib/libz.so -Wl,-rpath-link=$ARM_LIB,-dynamic-linker=/system/bin/linker -L$ARM_LIB -nostdlib $ARM_LIB/crtbegin_dynamic.o $ARM_LIB/crtend_android.o -lc -lm -ldl -lgcc"

这里生成的是x264的静态库

整个工程唯一有点麻烦的是 生成 JNI 动态库的时候 报错 。。

后来发现是少链接了一个库，

于是根据x264的编译方法 在Android.mk添加一些配置就可以了。当然这就是难点，在网上查了很多都没有结果。

有些目录的参数自己调整哈

我把前面生成的libx264.a 和 x264.h 文件放到jni的libx264目录下了 有问题自己调整

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)
LOCAL_C_INCLUDES +=$(LOCAL_PATH)/libx264/include
LOCAL_MODULE := H264Android
LOCAL_SRC_FILES := H264Android.c
LOCAL_LDFLAGS += $(LOCAL_PATH)/libx264/lib/libx264.a
LOCAL_LDLIBS := -L$(SYSROOT)/usr/lib -lgcc

include $(BUILD_SHARED_LIBRARY)

估计很多人都会发现很熟悉 嘻嘻 这个就是根据

http://www.cnblogs.com/mcodec/articles/1780598.html

改的 连文件名字都没有换！！比较懒

另： 编码的效率很低下啊

AndroidVideo.java

import java.io.File;
import java.io.RandomAccessFile;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.content.res.Configuration;
import android.os.Bundle;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.Window;
import android.view.WindowManager;
import android.view.SurfaceHolder.Callback;
import android.graphics.PixelFormat;
import android.hardware.Camera;
public class AndroidVideo extends Activity implements Callback,
		Camera.PictureCallback {
	private SurfaceView mSurfaceView = null;
	private SurfaceHolder mSurfaceHolder = null;
	private Camera mCamera = null;
	private boolean mPreviewRunning = false;
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		getWindow().setFormat(PixelFormat.TRANSLUCENT);
		requestWindowFeature(Window.FEATURE_NO_TITLE);
		getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
				WindowManager.LayoutParams.FLAG_FULLSCREEN);
		setContentView(R.layout.camera);
	    mSurfaceView = (SurfaceView) this.findViewById(R.id.surface_camera);
		mSurfaceHolder = mSurfaceView.getHolder();
		mSurfaceHolder.addCallback(this);
		mSurfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
	}
	
	@Override
	public void onPictureTaken(byte[] data, Camera camera) {
	}
	@Override
	public void surfaceChanged(SurfaceHolder holder, int format, int width,
			int height) {
		if (mPreviewRunning) {
			mCamera.stopPreview();
		}
		Camera.Parameters p = mCamera.getParameters();
		p.setPreviewSize(352, 288);
		mCamera.setPreviewCallback(new H264Encoder(352, 288));
		mCamera.setParameters(p);
		try {
			mCamera.setPreviewDisplay(holder);
		} catch (Exception ex) {
		}
		mCamera.startPreview();
		mPreviewRunning = true;
	}
	@Override
	public void surfaceCreated(SurfaceHolder holder) {
		mCamera = Camera.open();
	}
	@Override
	public void surfaceDestroyed(SurfaceHolder holder) {
		if (mCamera != null) {
			mCamera.setPreviewCallback(null);
			mCamera.stopPreview();
			mPreviewRunning = false;
			mCamera.release();
			mCamera = null;
		}
	}
	public void onConfigurationChanged(Configuration newConfig) {
		try {
			super.onConfigurationChanged(newConfig);
			if (this.getResources().getConfiguration().orientation == Configuration.ORIENTATION_LANDSCAPE) {
			} else if (this.getResources().getConfiguration().orientation == Configuration.ORIENTATION_PORTRAIT) {
			}
		} catch (Exception ex) {
		}
	}
}
class H264Encoder implements Camera.PreviewCallback {
	long encoder=0;
	RandomAccessFile raf=null;
	byte[] h264Buff =null;
	static {
		System.loadLibrary("H264Android");
	}
	private H264Encoder(){};
	
	public H264Encoder(int width, int height) {
		encoder = CompressBegin(width, height);
		h264Buff = new byte[width * height *8];
		try {
			File file = new File("/sdcard/camera.h264");
			raf = new RandomAccessFile(file, "rw");
		} catch (Exception ex) {
			Log.v("System.out", ex.toString());
		}
		
	};
	protected void finalize()
    {
		CompressEnd(encoder);
		if (null != raf)
		{
			try {
				raf.close();
			} catch (Exception ex) {
				Log.v("System.out", ex.toString());
			}
		}
		try {
			super.finalize();
		} catch (Throwable e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
    }
	private native long CompressBegin(int width,int height);
	private native int CompressBuffer(long encoder, int type,byte[] in, int insize,byte[] out);
	private native int CompressEnd(long encoder);
	@Override
	public void onPreviewFrame(byte[] data, Camera camera) {	
		
		int result=CompressBuffer(encoder, -1, data, data.length,h264Buff);
		try {
			if (result>0)
				raf.write(h264Buff, 0, result);
		} catch (Exception ex) {
			Log.v("System.out", ex.toString());
		}
	}
	
}

H264Android.c

#include <string.h>
#include <jni.h>
#include <stdio.h>
#include <stdlib.h>
#include <arpa/inet.h>
#include <x264.h>
#define DATA_MAX 3000000
#define H264_MTU 1024
typedef 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_param_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;
	jbyte * Buf = (jbyte*)(*env)->GetByteArrayElements(env, in, 0);
	jbyte * h264Buf = (jbyte*)(*env)->GetByteArrayElements(env, out, 0);
	unsigned char * pTmpOut = h264Buf;
	int nPicSize=en->param->i_width*en->param->i_height;
	/*
	Y数据全部从在一块，UV数据使用interleave方式存储
	YYYY
	YYYY
	UVUV
	 */
	jbyte * y=en->picture->img.plane[0];
	jbyte * v=en->picture->img.plane[1];
	jbyte * u=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;
}