5.0 本节分析所使用的应用程序源代码
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本节分析所使用的应用程序的源代码/* * Copyright 2004-2013 Freescale Semiconductor, Inc. All rights reserved. *//* * The code contained herein is licensed under the GNU General Public * License. You may obtain a copy of the GNU General Public License * Version 2 or later at the following locations: * * http://www.opensource.org/licenses/gpl-license.html * http://www.gnu.org/copyleft/gpl.html *//* * @file mxc_v4l2_capture.c * * @brief Mxc Video For Linux 2 driver test application * */#ifdef __cplusplusextern "C"{#endif/*======================================================================= INCLUDE FILES=======================================================================*//* Standard Include Files */#include <errno.h>/* Verification Test Environment Include Files */#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>struct v4l2_mxc_offset {uint32_t u_offset;uint32_t v_offset;};#define TEST_BUFFER_NUM 3struct testbuffer{ unsigned char *start; size_t offset; unsigned int length;};struct testbuffer buffers[TEST_BUFFER_NUM];int g_in_width = 176;int g_in_height = 144;int g_out_width = 176;int g_out_height = 144;int g_top = 0;int g_left = 0;int g_input = 0;int g_capture_count = 100;int g_rotate = 0;int g_cap_fmt = V4L2_PIX_FMT_YUV420;int g_camera_framerate = 30;int g_extra_pixel = 0;int g_capture_mode = 0;int g_usb_camera = 0;char g_v4l_device[100] = "/dev/video0";static void print_pixelformat(char *prefix, int val){printf("%s: %c%c%c%c\n", prefix ? prefix : "pixelformat",val & 0xff,(val >> 8) & 0xff,(val >> 16) & 0xff,(val >> 24) & 0xff);}int start_capturing(int fd_v4l){ unsigned int i; struct v4l2_buffer buf; enum v4l2_buf_type type; for (i = 0; i < TEST_BUFFER_NUM; i++) { memset(&buf, 0, sizeof (buf)); buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; buf.memory = V4L2_MEMORY_MMAP; buf.index = i; if (ioctl(fd_v4l, VIDIOC_QUERYBUF, &buf) < 0) { printf("VIDIOC_QUERYBUF error\n"); return -1; } buffers[i].length = buf.length; buffers[i].offset = (size_t) buf.m.offset; buffers[i].start = mmap (NULL, buffers[i].length, PROT_READ | PROT_WRITE, MAP_SHARED, fd_v4l, buffers[i].offset);memset(buffers[i].start, 0xFF, buffers[i].length); } for (i = 0; i < TEST_BUFFER_NUM; i++) { memset(&buf, 0, sizeof (buf)); buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; buf.memory = V4L2_MEMORY_MMAP; buf.index = i;buf.m.offset = buffers[i].offset;if (g_extra_pixel){ buf.m.offset += g_extra_pixel * (g_out_width + 2 * g_extra_pixel) + g_extra_pixel;} if (ioctl (fd_v4l, VIDIOC_QBUF, &buf) < 0) { printf("VIDIOC_QBUF error\n"); return -1; } } type = V4L2_BUF_TYPE_VIDEO_CAPTURE; if (ioctl (fd_v4l, VIDIOC_STREAMON, &type) < 0) { printf("VIDIOC_STREAMON error\n"); return -1; } return 0;}int stop_capturing(int fd_v4l){ enum v4l2_buf_type type; type = V4L2_BUF_TYPE_VIDEO_CAPTURE; return ioctl (fd_v4l, VIDIOC_STREAMOFF, &type);}int v4l_capture_setup(void){ struct v4l2_format fmt; struct v4l2_control ctrl; struct v4l2_streamparm parm;struct v4l2_crop crop; int fd_v4l = 0;struct v4l2_mxc_offset off;struct v4l2_dbg_chip_ident chip;struct v4l2_frmsizeenum fsize;struct v4l2_fmtdesc ffmt; if ((fd_v4l = open(g_v4l_device, O_RDWR, 0)) < 0) { printf("Unable to open %s\n", g_v4l_device); return 0; }/* UVC driver does not support this ioctl */if (g_usb_camera != 1) {if (ioctl(fd_v4l, VIDIOC_DBG_G_CHIP_IDENT, &chip)){printf("VIDIOC_DBG_G_CHIP_IDENT failed.\n");return -1;}printf("sensor chip is %s\n", chip.match.name);}printf("sensor supported frame size:\n");fsize.index = 0;while (ioctl(fd_v4l, VIDIOC_ENUM_FRAMESIZES, &fsize) >= 0) {printf(" %dx%d\n", fsize.discrete.width, fsize.discrete.height);fsize.index++;}ffmt.index = 0;while (ioctl(fd_v4l, VIDIOC_ENUM_FMT, &ffmt) >= 0) {print_pixelformat("sensor frame format", ffmt.pixelformat);ffmt.index++;}parm.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;parm.parm.capture.timeperframe.numerator = 1;parm.parm.capture.timeperframe.denominator = g_camera_framerate;parm.parm.capture.capturemode = g_capture_mode;if (ioctl(fd_v4l, VIDIOC_S_PARM, &parm) < 0){ printf("VIDIOC_S_PARM failed\n"); return -1;}if (ioctl(fd_v4l, VIDIOC_S_INPUT, &g_input) < 0){printf("VIDIOC_S_INPUT failed\n");return -1;}/* UVC driver does not implement CROP */if (g_usb_camera != 1) {crop.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;if (ioctl(fd_v4l, VIDIOC_G_CROP, &crop) < 0){printf("VIDIOC_G_CROP failed\n");return -1;}crop.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;crop.c.width = g_in_width;crop.c.height = g_in_height;crop.c.top = g_top;crop.c.left = g_left;if (ioctl(fd_v4l, VIDIOC_S_CROP, &crop) < 0){printf("VIDIOC_S_CROP failed\n");return -1;}} fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;fmt.fmt.pix.pixelformat = g_cap_fmt; fmt.fmt.pix.width = g_out_width; fmt.fmt.pix.height = g_out_height; if (g_extra_pixel){off.u_offset = (2 * g_extra_pixel + g_out_width) * (g_out_height + g_extra_pixel) - g_extra_pixel + (g_extra_pixel / 2) * ((g_out_width / 2) + g_extra_pixel) + g_extra_pixel / 2;off.v_offset = off.u_offset + (g_extra_pixel + g_out_width / 2) *((g_out_height / 2) + g_extra_pixel); fmt.fmt.pix.bytesperline = g_out_width + g_extra_pixel * 2;fmt.fmt.pix.priv = (uint32_t) &off; fmt.fmt.pix.sizeimage = (g_out_width + g_extra_pixel * 2 ) * (g_out_height + g_extra_pixel * 2) * 3 / 2;} else { fmt.fmt.pix.bytesperline = g_out_width;fmt.fmt.pix.priv = 0; fmt.fmt.pix.sizeimage = 0;} if (ioctl(fd_v4l, VIDIOC_S_FMT, &fmt) < 0) { printf("set format failed\n"); return 0; } /* * Set rotation * It's mxc-specific definition for rotation. */if (g_usb_camera != 1) {ctrl.id = V4L2_CID_PRIVATE_BASE + 0;ctrl.value = g_rotate;if (ioctl(fd_v4l, VIDIOC_S_CTRL, &ctrl) < 0){printf("set ctrl failed\n");return 0;}} struct v4l2_requestbuffers req; memset(&req, 0, sizeof (req)); req.count = TEST_BUFFER_NUM; req.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; req.memory = V4L2_MEMORY_MMAP; if (ioctl(fd_v4l, VIDIOC_REQBUFS, &req) < 0) { printf("v4l_capture_setup: VIDIOC_REQBUFS failed\n"); return 0; } return fd_v4l;}int v4l_capture_test(int fd_v4l, const char * file){ struct v4l2_buffer buf;#if TEST_OUTSYNC_ENQUE struct v4l2_buffer temp_buf;#endif struct v4l2_format fmt; FILE * fd_y_file = 0; int count = g_capture_count; if ((fd_y_file = fopen(file, "wb")) ==NULL) { printf("Unable to create y frame recording file\n"); return -1; } fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; if (ioctl(fd_v4l, VIDIOC_G_FMT, &fmt) < 0) { printf("get format failed\n"); return -1; } else { printf("\t Width = %d", fmt.fmt.pix.width); printf("\t Height = %d", fmt.fmt.pix.height); printf("\t Image size = %d\n", fmt.fmt.pix.sizeimage);print_pixelformat(0, fmt.fmt.pix.pixelformat); } if (start_capturing(fd_v4l) < 0) { printf("start_capturing failed\n"); return -1; } while (count-- > 0) { memset(&buf, 0, sizeof (buf)); buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; buf.memory = V4L2_MEMORY_MMAP; if (ioctl (fd_v4l, VIDIOC_DQBUF, &buf) < 0){ printf("VIDIOC_DQBUF failed.\n"); } fwrite(buffers[buf.index].start, fmt.fmt.pix.sizeimage, 1, fd_y_file);#if TEST_OUTSYNC_ENQUE/* Testing out of order enque */if (count == 25) {temp_buf = buf; printf("buf.index %d\n", buf.index);continue;}if (count == 15) { if (ioctl (fd_v4l, VIDIOC_QBUF, &temp_buf) < 0) { printf("VIDIOC_QBUF failed\n"); break; }}#endif if (count >= TEST_BUFFER_NUM) { if (ioctl (fd_v4l, VIDIOC_QBUF, &buf) < 0) { printf("VIDIOC_QBUF failed\n"); break; } } else printf("buf.index %d\n", buf.index); } if (stop_capturing(fd_v4l) < 0) { printf("stop_capturing failed\n"); return -1; } fclose(fd_y_file); close(fd_v4l); return 0;}int process_cmdline(int argc, char **argv){ int i; for (i = 1; i < argc; i++) { if (strcmp(argv[i], "-iw") == 0) { g_in_width = atoi(argv[++i]); } else if (strcmp(argv[i], "-ih") == 0) { g_in_height = atoi(argv[++i]); }else if (strcmp(argv[i], "-ow") == 0) {g_out_width = atoi(argv[++i]);}else if (strcmp(argv[i], "-oh") == 0) {g_out_height = atoi(argv[++i]);}else if (strcmp(argv[i], "-t") == 0) {g_top = atoi(argv[++i]);}else if (strcmp(argv[i], "-l") == 0) {g_left = atoi(argv[++i]);}else if (strcmp(argv[i], "-i") == 0) {g_input = atoi(argv[++i]);} else if (strcmp(argv[i], "-r") == 0) { g_rotate = atoi(argv[++i]); } else if (strcmp(argv[i], "-c") == 0) { g_capture_count = atoi(argv[++i]); } else if (strcmp(argv[i], "-fr") == 0) { g_camera_framerate = atoi(argv[++i]); } else if (strcmp(argv[i], "-e") == 0) { g_extra_pixel = atoi(argv[++i]); }else if (strcmp(argv[i], "-m") == 0) {g_capture_mode = atoi(argv[++i]);}else if (strcmp(argv[i], "-d") == 0) {strcpy(g_v4l_device, argv[++i]);} else if (strcmp(argv[i], "-f") == 0) { i++; g_cap_fmt = v4l2_fourcc(argv[i][0], argv[i][1],argv[i][2],argv[i][3]); if ( (g_cap_fmt != V4L2_PIX_FMT_BGR24) && (g_cap_fmt != V4L2_PIX_FMT_BGR32) && (g_cap_fmt != V4L2_PIX_FMT_RGB565) && (g_cap_fmt != V4L2_PIX_FMT_NV12) && (g_cap_fmt != V4L2_PIX_FMT_YUV422P) && (g_cap_fmt != V4L2_PIX_FMT_UYVY) && (g_cap_fmt != V4L2_PIX_FMT_YUYV) && (g_cap_fmt != V4L2_PIX_FMT_YVU420) && (g_cap_fmt != V4L2_PIX_FMT_YUV420) ) { return -1; } }else if (strcmp(argv[i], "-uvc") == 0) {g_usb_camera = 1;} else if (strcmp(argv[i], "-help") == 0) { printf("MXC Video4Linux capture Device Test\n\n" \ "Syntax: mxc_v4l2_capture.out -iw <capture croped width>\n" \ " -ih <capture cropped height>\n" \ " -ow <capture output width>\n" \ " -oh <capture output height>\n" \ " -t <capture top>\n" \ " -l <capture left>\n" \ " -i <input mode, 0-use csi->prp_enc->mem, 1-use csi->mem>\n" \ " -r <rotation> -c <capture counter> \n" " -e <destination cropping: extra pixels> \n" \ " -m <capture mode, 0-low resolution, 1-high resolution> \n" \ " -d <camera select, /dev/video0, /dev/video1> \n" \ " -uvc (for USB camera test) \n" \ " -f <format> -fr <frame rate, 30fps by default> \n"); return -1; } }printf("in_width = %d, in_height = %d\n", g_in_width, g_in_height);printf("out_width = %d, out_height = %d\n", g_out_width, g_out_height);printf("top = %d, left = %d\n", g_top, g_left); if ((g_in_width == 0) || (g_in_height == 0)) { return -1; } return 0;}int main(int argc, char **argv){ int fd_v4l; if (process_cmdline(argc, argv) < 0) { return -1; } fd_v4l = v4l_capture_setup(); return v4l_capture_test(fd_v4l, argv[argc-1]);}执行应用程序所使用的命令如下:
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