android4.0 USB Camera实例(三)UVC

前面我写了两篇文章说明了zc301的实现 具体请看/article/1615270.html

下面顺便把通用的USB也写上 前面的ZC301获取到的格式是JPEG的所以不用进行什么处理就可以用来显示，但是标准的UVC获取到的是YUV422格式的需要转换成RGB后才能进行显示 这里我们在前面两篇的代码稍作修改就可以了

HAL层 代码如下

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/*

* Android USB Camera zc3xx Library

*

* Copyright (c) 2014 Store information technology guangzhou ltd<http://www.storeinf.com>

* Copyright (c) 2014 hclydao <hclydao@gmail.com>

*

* This program is free software; you can redistribute it and/or modify

* it under the terms of the GNU General Public License as published by

* the Free Software Foundation; either version 2 of the License.

*/

#include <errno.h>

#include <sys/types.h>

#include <sys/stat.h>

#include <fcntl.h>

#include <sys/ioctl.h>

#include <unistd.h>

#include <stdint.h>

#include <stdio.h>

#include <stdlib.h>

#include <asm/types.h>

#include <linux/videodev2.h>

#include <sys/mman.h>

#include <string.h>

#include <malloc.h>

#include <linux/fb.h>

#include <jni.h>

#include <string.h>

#include <android/log.h>

#include <syslog.h>

#include <android/log.h>

#include <android/bitmap.h>

#define LOG_TAG "FimcGzsd"

#define LOGV(...) __android_log_print(ANDROID_LOG_VERBOSE, LOG_TAG, __VA_ARGS__)

#define LOGD(...) __android_log_print(ANDROID_LOG_DEBUG , LOG_TAG, __VA_ARGS__)

#define LOGI(...) __android_log_print(ANDROID_LOG_INFO , LOG_TAG, __VA_ARGS__)

#define LOGW(...) __android_log_print(ANDROID_LOG_WARN , LOG_TAG, __VA_ARGS__)

#define LOGE(...) __android_log_print(ANDROID_LOG_ERROR , LOG_TAG, __VA_ARGS__)

struct fimc_buffer {

unsigned char *start;

size_t length;

};

static int fd = -1;

struct fimc_buffer *buffers=NULL;

struct v4l2_buffer v4l2_buf;

static int bufnum = 1;

static int mwidth,mheight;

static int c_type = 0;

int *rgb = NULL;

int *ybuf = NULL;

int yuv_tbl_ready=0;

int y1192_tbl[256];

int v1634_tbl[256];

int v833_tbl[256];

int u400_tbl[256];

int u2066_tbl[256];

/*

*open usb camera device

*/

JNIEXPORT jint JNICALL Java_com_dao_usbcam_Fimcgzsd_open(JNIEnv * env, jclass obj, const jbyteArray devname)

{

jbyte *dev = (jbyte*)(*env)->GetByteArrayElements(env, devname, 0);

fd = open(dev, O_RDWR, 0);

if (fd<0)

{

LOGE("%s ++++ open error\n",dev);

return -1;

}

(*env)->ReleaseByteArrayElements(env, devname, dev, 0);

return fd;

}

/*

* init device

*/

JNIEXPORT jint JNICALL Java_com_dao_usbcam_Fimcgzsd_init(JNIEnv * env, jclass obj, jint width, jint height,jint numbuf,jint ctype)

{

int ret;

int i;

bufnum = numbuf;

mwidth = width;

mheight = height;

c_type = ctype;

struct v4l2_format fmt;

struct v4l2_capability cap;

ret = ioctl(fd, VIDIOC_QUERYCAP, &cap);

if (ret < 0) {

LOGE("%d :VIDIOC_QUERYCAP failed\n",__LINE__);

return -1;

}

if (!(cap.capabilities & V4L2_CAP_VIDEO_CAPTURE)) {

LOGE("%d : no capture devices\n",__LINE__);

return -1;

}

memset( &fmt, 0, sizeof(fmt));

fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;

if(c_type == 1)

fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_YUYV;

else

fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_RGB565;

fmt.fmt.pix.width = width;

fmt.fmt.pix.height = height;

if (ioctl(fd, VIDIOC_S_FMT, &fmt) < 0)

{

LOGE("++++%d : set format failed\n",__LINE__);

return -1;

}

struct v4l2_requestbuffers req;

req.count = numbuf;

req.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;

req.memory = V4L2_MEMORY_MMAP;

ret = ioctl(fd, VIDIOC_REQBUFS, &req);

if (ret < 0) {

LOGE("++++%d : VIDIOC_REQBUFS failed\n",__LINE__);

return -1;

}

buffers = calloc(req.count, sizeof(*buffers));

if (!buffers) {

LOGE ("++++%d Out of memory\n",__LINE__);

return -1;

}

for(i = 0; i< bufnum; ++i) {

memset(&v4l2_buf, 0, sizeof(v4l2_buf));

v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;

v4l2_buf.memory = V4L2_MEMORY_MMAP;

v4l2_buf.index = i;

ret = ioctl(fd , VIDIOC_QUERYBUF, &v4l2_buf);

if(ret < 0) {

LOGE("+++%d : VIDIOC_QUERYBUF failed\n",__LINE__);

return -1;

}

buffers[i].length = v4l2_buf.length;

if ((buffers[i].start = (char *)mmap(0, v4l2_buf.length,

PROT_READ | PROT_WRITE, MAP_SHARED,

fd, v4l2_buf.m.offset)) < 0) {

LOGE("%d : mmap() failed",__LINE__);

return -1;

}

}

rgb = (int *)malloc(sizeof(int) * (mwidth*mheight));

ybuf = (int *)malloc(sizeof(int) * (mwidth*mheight));

return 0;

}

/*

*open usb camera device

*/

JNIEXPORT jint JNICALL Java_com_dao_usbcam_Fimcgzsd_streamon(JNIEnv * env, jclass obj)

{

int i;

int ret;

enum v4l2_buf_type type = V4L2_BUF_TYPE_VIDEO_CAPTURE;

for(i = 0; i< bufnum; ++i) {

memset(&v4l2_buf, 0, sizeof(v4l2_buf));

v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;

v4l2_buf.memory = V4L2_MEMORY_MMAP;

v4l2_buf.index = i;

ret = ioctl(fd, VIDIOC_QBUF, &v4l2_buf);

if (ret < 0) {

LOGE("%d : VIDIOC_QBUF failed\n",__LINE__);

return ret;

}

}

ret = ioctl(fd, VIDIOC_STREAMON, &type);

if (ret < 0) {

LOGE("%d : VIDIOC_STREAMON failed\n",__LINE__);

return ret;

}

return 0;

}

void yuyv422toABGRY(unsigned char *src)

{

int width=0;

int height=0;

width = mwidth;

height = mheight;

int frameSize =width*height*2;

int i;

if((!rgb || !ybuf)){

return;

}

int *lrgb = NULL;

int *lybuf = NULL;

lrgb = &rgb[0];

lybuf = &ybuf[0];

if(yuv_tbl_ready==0){

for(i=0 ; i<256 ; i++){

y1192_tbl[i] = 1192*(i-16);

if(y1192_tbl[i]<0){

y1192_tbl[i]=0;

}

v1634_tbl[i] = 1634*(i-128);

v833_tbl[i] = 833*(i-128);

u400_tbl[i] = 400*(i-128);

u2066_tbl[i] = 2066*(i-128);

}

yuv_tbl_ready=1;

}

for(i=0 ; i<frameSize ; i+=4){

unsigned char y1, y2, u, v;

y1 = src[i];

u = src[i+1];

y2 = src[i+2];

v = src[i+3];

int y1192_1=y1192_tbl[y1];

int r1 = (y1192_1 + v1634_tbl[v])>>10;

int g1 = (y1192_1 - v833_tbl[v] - u400_tbl[u])>>10;

int b1 = (y1192_1 + u2066_tbl[u])>>10;

int y1192_2=y1192_tbl[y2];

int r2 = (y1192_2 + v1634_tbl[v])>>10;

int g2 = (y1192_2 - v833_tbl[v] - u400_tbl[u])>>10;

int b2 = (y1192_2 + u2066_tbl[u])>>10;

r1 = r1>255 ? 255 : r1<0 ? 0 : r1;

g1 = g1>255 ? 255 : g1<0 ? 0 : g1;

b1 = b1>255 ? 255 : b1<0 ? 0 : b1;

r2 = r2>255 ? 255 : r2<0 ? 0 : r2;

g2 = g2>255 ? 255 : g2<0 ? 0 : g2;

b2 = b2>255 ? 255 : b2<0 ? 0 : b2;

*lrgb++ = 0xff000000 | b1<<16 | g1<<8 | r1;

*lrgb++ = 0xff000000 | b2<<16 | g2<<8 | r2;

if(lybuf!=NULL){

*lybuf++ = y1;

*lybuf++ = y2;

}

}

}

void

Java_com_dao_usbcam_Fimcgzsd_pixeltobmp( JNIEnv* env,jobject thiz,jobject bitmap){

jboolean bo;

AndroidBitmapInfo info;

void* pixels;

int ret;

int i;

int *colors;

int width=0;

int height=0;

if ((ret = AndroidBitmap_getInfo(env, bitmap, &info)) < 0) {

LOGE("AndroidBitmap_getInfo() failed ! error=%d", ret);

return;

}

width = info.width;

height = info.height;

if(!rgb || !ybuf) return;

if (info.format != ANDROID_BITMAP_FORMAT_RGBA_8888) {

LOGE("Bitmap format is not RGBA_8888 !");

return;

}

if ((ret = AndroidBitmap_lockPixels(env, bitmap, &pixels)) < 0) {

LOGE("AndroidBitmap_lockPixels() failed ! error=%d", ret);

}

colors = (int*)pixels;

int *lrgb =NULL;

lrgb = &rgb[0];

for(i=0 ; i<width*height ; i++){

*colors++ = *lrgb++;

}

AndroidBitmap_unlockPixels(env, bitmap);

}

void yuyv422torgb(unsigned char *src,unsigned int *mrgb)

{

int width=0;

int height=0;

width = mwidth;

height = mheight;

int frameSize =width*height*2;

int i;

if((!rgb || !ybuf)){

return;

}

int *lrgb = NULL;

int *lybuf = NULL;

lrgb = mrgb;

lybuf = &ybuf[0];

if(yuv_tbl_ready==0){

for(i=0 ; i<256 ; i++){

y1192_tbl[i] = 1192*(i-16);

if(y1192_tbl[i]<0){

y1192_tbl[i]=0;

}

v1634_tbl[i] = 1634*(i-128);

v833_tbl[i] = 833*(i-128);

u400_tbl[i] = 400*(i-128);

u2066_tbl[i] = 2066*(i-128);

}

yuv_tbl_ready=1;

}

for(i=0 ; i<frameSize ; i+=4){

unsigned char y1, y2, u, v;

y1 = src[i];

u = src[i+1];

y2 = src[i+2];

v = src[i+3];

int y1192_1=y1192_tbl[y1];

int r1 = (y1192_1 + v1634_tbl[v])>>10;

int g1 = (y1192_1 - v833_tbl[v] - u400_tbl[u])>>10;

int b1 = (y1192_1 + u2066_tbl[u])>>10;

int y1192_2=y1192_tbl[y2];

int r2 = (y1192_2 + v1634_tbl[v])>>10;

int g2 = (y1192_2 - v833_tbl[v] - u400_tbl[u])>>10;

int b2 = (y1192_2 + u2066_tbl[u])>>10;

r1 = r1>255 ? 255 : r1<0 ? 0 : r1;

g1 = g1>255 ? 255 : g1<0 ? 0 : g1;

b1 = b1>255 ? 255 : b1<0 ? 0 : b1;

r2 = r2>255 ? 255 : r2<0 ? 0 : r2;

g2 = g2>255 ? 255 : g2<0 ? 0 : g2;

b2 = b2>255 ? 255 : b2<0 ? 0 : b2;

*lrgb++ = 0xff000000 | b1<<16 | g1<<8 | r1;

*lrgb++ = 0xff000000 | b2<<16 | g2<<8 | r2;

if(lybuf!=NULL){

*lybuf++ = y1;

*lybuf++ = y2;

}

}

}

JNIEXPORT jint JNICALL Java_com_dao_usbcam_Fimcgzsd_yuvtorgb(JNIEnv * env, jclass obj,const jbyteArray yuvdata, jintArray rgbdata)

{

jbyte *ydata = (jbyte*)(*env)->GetByteArrayElements(env, yuvdata, 0);

jint *rdata = (jint*)(*env)->GetIntArrayElements(env, rgbdata, 0);

yuyv422torgb(ydata,rdata);

(*env)->ReleaseByteArrayElements(env, yuvdata, ydata, 0);

(*env)->ReleaseIntArrayElements(env, rgbdata, rdata, 0);

return 0;

}

/*

*get one frame data

*/

JNIEXPORT jint JNICALL Java_com_dao_usbcam_Fimcgzsd_dqbuf(JNIEnv * env, jclass obj,const jbyteArray videodata)

{

int ret;

jbyte *data = (jbyte*)(*env)->GetByteArrayElements(env, videodata, 0);

v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;

v4l2_buf.memory = V4L2_MEMORY_MMAP;

ret = ioctl(fd, VIDIOC_DQBUF, &v4l2_buf);

if (ret < 0) {

LOGE("%s : VIDIOC_DQBUF failed, dropped frame\n",__func__);

return ret;

}

if(c_type == 1)

yuyv422toABGRY((unsigned char *)buffers[v4l2_buf.index].start);

memcpy(data,buffers[v4l2_buf.index].start,buffers[v4l2_buf.index].length);

(*env)->ReleaseByteArrayElements(env, videodata, data, 0);

return v4l2_buf.index;

}

/*

*put in frame buffer to queue

*/

JNIEXPORT jint JNICALL Java_com_dao_usbcam_Fimcgzsd_qbuf(JNIEnv * env, jclass obj,jint index)

{

int ret;

v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;

v4l2_buf.memory = V4L2_MEMORY_MMAP;

v4l2_buf.index = index;

ret = ioctl(fd, VIDIOC_QBUF, &v4l2_buf);

if (ret < 0) {

LOGE("%s : VIDIOC_QBUF failed\n",__func__);

return ret;

}

return 0;

}

/*

*streamoff

*/

JNIEXPORT jint JNICALL Java_com_dao_usbcam_Fimcgzsd_streamoff(JNIEnv * env, jclass obj,jint index)

{

enum v4l2_buf_type type = V4L2_BUF_TYPE_VIDEO_CAPTURE;

int ret;

ret = ioctl(fd, VIDIOC_STREAMOFF, &type);

if (ret < 0) {

LOGE("%s : VIDIOC_STREAMOFF failed\n",__func__);

return ret;

}

return 0;

}

/*

*release

*/

JNIEXPORT jint JNICALL Java_com_dao_usbcam_Fimcgzsd_release(JNIEnv * env, jclass obj)

{

enum v4l2_buf_type type = V4L2_BUF_TYPE_VIDEO_CAPTURE;

int ret;

int i;

ret = ioctl(fd, VIDIOC_STREAMOFF, &type);

if (ret < 0) {

LOGE("%s : VIDIOC_STREAMOFF failed\n",__func__);

return ret;

}

for (i = 0; i < bufnum; i++) {

ret = munmap(buffers[i].start, buffers[i].length);

if (ret < 0) {

LOGE("%s : munmap failed\n",__func__);

return ret;

}

}

free (buffers);

if(rgb) free(rgb);

if(ybuf) free(ybuf);

close(fd);

return 0;

}

主要增加了两个函数

yuyv422toABGRY 这个是yuv转rgb

Java_com_dao_usbcam_Fimcgzsd_pixeltobmp 这个是rgb转bitmap

这两个函数是我在网上找到例子simplewebcam里拷出来的

同时Android.mk修改如下

[java] view
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LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)

LOCAL_MODULE := fimcgzsd

LOCAL_SRC_FILES := fimcgzsd.c

LOCAL_LDLIBS := -llog -ljnigraphics

include $(BUILD_SHARED_LIBRARY)

增加了一个Application.mk

[java] view
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# The ARMv7 is significanly faster due to the use of the hardware FPU

APP_ABI := armeabi armeabi-v7a

APP_PLATFORM := android-8

这样在终端进入工程所有目录直接执行ndk-build(环境变量已经设置)即可生成动态库

应用层

增加一个c_type指定是zc301还是uvc 我还是把代码贴上来吧

[java] view
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package com.dao.usbcam;

import java.io.ByteArrayOutputStream;

import java.io.File;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

import android.app.Activity;

import android.graphics.Bitmap;

import android.graphics.BitmapFactory;

import android.graphics.ImageFormat;

import android.graphics.Rect;

import android.graphics.YuvImage;

import android.os.Bundle;

import android.os.Environment;

import android.os.Handler;

import android.text.format.Time;

import android.view.Menu;

import android.view.View;

import android.view.View.OnClickListener;

import android.view.Window;

import android.view.WindowManager;

import android.widget.Button;

import android.widget.ImageView;

import android.widget.Toast;

public class MainActivity extends Activity {

private ImageView mImag;

private int width = 320;

private int height = 240;

private String devname = "/dev/video3";

private byte[] mdata;

private Handler mHandler;

private int numbuf = 0;

private int index = 0;

private int ret = 0;

private int ctype = 1;//0 is zc301 1 is uvc camera

public Button mcap;

private Bitmap bitmap;

private Bitmap bmp;

private int[] rgb;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

requestWindowFeature(Window.FEATURE_NO_TITLE);

getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,

WindowManager.LayoutParams.FLAG_FULLSCREEN);

setContentView(R.layout.activity_main);

mImag = (ImageView)findViewById(R.id.mimg);

mcap = (Button)findViewById(R.id.mcap);

bmp = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);

numbuf = 4;

mdata = new byte[width * height * numbuf];

rgb = new int[width * height * numbuf];

ret = Fimcgzsd.open(devname.getBytes());

if(ret < 0)

finish();

ret = Fimcgzsd.init(width, height, numbuf,ctype);

if(ret < 0)

finish();

ret = Fimcgzsd.streamon();

if(ret < 0)

finish();

mHandler = new Handler();

new StartThread().start();

mcap.setOnClickListener(new CaptureListener());

}

final Runnable mUpdateUI = new Runnable() {

@Override

public void run() {

// TODO Auto-generated method stub

mImag.setImageBitmap(bitmap);

}

};

class StartThread extends Thread {

@Override

public void run() {

// TODO Auto-generated method stub

//super.run();

while(true) {

if(ctype == 1){

index = Fimcgzsd.dqbuf(mdata);

if((index < 0) || (mdata == null)) {

onDestroy();

break;

}

Fimcgzsd.pixeltobmp(bmp);

mHandler.post(mUpdateUI);

bitmap = bmp;

Fimcgzsd.qbuf(index);

//Fimcgzsd.yuvtorgb(mdata, rgb);

//mHandler.post(mUpdateUI);

//bitmap = Bitmap.createBitmap(rgb,width,height,Bitmap.Config.ARGB_8888);

//Fimcgzsd.qbuf(index);

} else {

index = Fimcgzsd.dqbuf(mdata);

if(index < 0) {

onDestroy();

break;

}

mHandler.post(mUpdateUI);

bitmap = BitmapFactory.decodeByteArray(mdata, 0, width * height);

Fimcgzsd.qbuf(index);

}

}

}

}

public static void saveMyBitmap(Bitmap mBitmap) {

Time mtime = new Time();

mtime.setToNow();

File fdir = new File(Environment.getExternalStorageDirectory().getPath() + "/DCIM/" + "/gzsd/");

if(!fdir.exists()) {

fdir.mkdir();

}

File f = new File(Environment.getExternalStorageDirectory().getPath() + "/DCIM/" + "/gzsd/" + mtime.year + mtime.month + mtime.monthDay + mtime.hour + mtime.minute +mtime.second+".png");

try {

f.createNewFile();

} catch (IOException e) {

e.printStackTrace();

}

FileOutputStream fOut = null;

try {

fOut = new FileOutputStream(f);

mBitmap.compress(Bitmap.CompressFormat.PNG, 100, fOut);

fOut.flush();

fOut.close();

} catch (FileNotFoundException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

}

class CaptureListener implements OnClickListener{

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

//new CapThread().start();

//Fimcgzsd.streamoff();

saveMyBitmap(bitmap);

//Fimcgzsd.streamon();

Toast.makeText(MainActivity.this, "Capture Successfully", Toast.LENGTH_SHORT).show();

}

}

class CapThread extends Thread {

@Override

public void run() {

// TODO Auto-generated method stub

//super.run();

saveMyBitmap(bitmap);

Toast.makeText(MainActivity.this, "Capture Successfully", Toast.LENGTH_LONG).show();

}

}

@Override

protected void onStop() {

// TODO Auto-generated method stub

super.onStop();

Fimcgzsd.release();

finish();

}

@Override

protected void onPause() {

// TODO Auto-generated method stub

super.onPause();

Fimcgzsd.release();

finish();

}

@Override

protected void onDestroy() {

// TODO Auto-generated method stub

super.onDestroy();

Fimcgzsd.release();

}

@Override

public boolean onCreateOptionsMenu(Menu menu) {

// Inflate the menu; this adds items to the action bar if it is present.

getMenuInflater().inflate(R.menu.main, menu);

finish();

return true;

}

}

原理什么的我前面已经简单的进行了说明这里 我就不说了 具体效果如下



感觉有点 模糊 我发现拿来自拍 效果还不错 模糊产生美 哈哈..

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作者：hclydao

http://blog.csdn.net/hclydao

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