android4.0 USB Camera实例UVC _Android4.0

寸阳分阴须爱惜，休负春色与时光。这篇文章主要讲述android4.0 USB Camera实例UVC相关的知识，希望能为你提供帮助。
前面我写了两篇文章说明了zc301的实现详细请看 http://blog.csdn.net/hclydao/article/details/21235919

以下顺便把通用的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能够用来显示，可是标准的UVC获取到的是YUV422格式的须要转换成RGB后才干进行显示这里我们在前面两篇的代码稍作改动就能够了
HAL层代码例如以下

/* * android USB Camera zc3xx Library * * Copyright (c) 2014Store information technology guangzhou ltd< http://www.storeinf.com> * Copyright (c) 2014hclydao < [email protected]> * * 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> #defineLOG_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_tlength; }; 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; AndroidBitmapInfoinfo; void*pixels; intret; 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 = https://www.songbingjia.com/android/(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; }

主要添加了两个函数
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样例simplewebcam里拷出来的

同一时候Android.mk改动例如以下

LOCAL_PATH := $(call my-dir)include $(CLEAR_VARS) LOCAL_MODULE:= fimcgzsd LOCAL_SRC_FILES := fimcgzsd.c LOCAL_LDLIBS:= -llog -ljnigraphics include $(BUILD_SHARED_LIBRARY)

添加了一个Application.mk

# 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project全部文件夹直接运行ndk-build(环境变量已经设置)就可以生成动态库
应用层
添加一个c_type指定是zc301还是uvc 我还是把代码贴上来吧

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 = https://www.songbingjia.com/android/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详细效果例如以下