DM642,DM643视频采集基本架构.doc

dm642,dm643视频采集基本架构-程序注释1 /* copyright 2004 by texas instruments incorporated. 2 * all rights reserved. property of texas instruments incorporated. 3 * restricted rights to use, duplicate or disclose this code are 4 * granted through contract. 5 */ 6 7 #include /如果使用c语言，必须将此文件作为第一个头文件。 8 #include 9 #include 10 #include 11 #include 12 #include /使用csl库，要用到的一些头文件，可参考csl 13 #include /视频驱动头文件 14 #include 15 #include 16 #include 17 #include 18 #include 19 #include 20 #include /芯片头文件。 21 22 /#include 23 #include /捕获设备配置文件 24 #include /如用vga显示，需要的显示设备配置文件 25 #include colorbar.h /如显示彩色滚动条，需要，否则不需要。 26 27 vport_portparams evmdm642_vcapparamsport 28 = evmdm642_cap_params_port_embedded_default; /定义捕获端口。 29 30 /* caputure configuration parameters */ 31 /* embedded sync mode is recommended as it offers better re-sync capability */ 32 /* the available capture modes are */ 33 /* ntsc720 */ 34 /* pal720 */ 35 36 static vportcap_params evmdm642_vcapparamschan 37 = evmdm642_cap_params_chan_embedded_default(pal720); 38 39 /捕获(即采集端口)端口,为pal制式。可依据需要改为ntsc制式 40 static tvp51xx_confparams evmdm642_vcapparamstvp51xx 41 = evmdm642_cap_params_tvp51xx_embedded_default(pal601, composite, 0); 42 43 /* coefficients for color space conversion */ 44 static const short coeffs5 = 0x2543, 0x3313, -0x0c8a, -0x1a04, 0x408d; 45 46 /vga显示，需将ycbcr656转换为rgb565,这是必要的转换矩阵 47 /* display configuration parameters */ 48 vport_portparams evmdm642_vdisparamsport /显示端口定义 49 = evmdm642_dis_params_port_default; 50 51 /* the available display modes are: * 52 * vga(640x48060fps) * 53 * svga(800x60060fps) * 54 * xga(1024x76860fps) */ 55 56 static vportdis_params evmdm642_vdisparamschan 57 = evmdm642_dis_params_chan_rgb565_default(vga); 58 59 /这里的显示端口定义为vga，即支持的是vga输出。 60 static saa7105_confparams evmdm642_vdisparamssaa7105 61 = evmdm642_dis_params_saa7105_rgb565_default(vga); 62 63 /* heap ids defined in the bios configuration file */ 64 extern int externalheap; /在dsp/bios中已定义 65 /* 66 * = main = 67 */ 68 69 main() 70 71 /*/ 72 /* open csl dat module for fast copy */ 73 /*/ 74 csl_init(); /调用任何csl库中的函数，必须先在此调用该函数。 75 cache_clean(cache_l2all, 0, 0); /清洗cache 76 cache_setl2mode(cache_256kcache); /设置cache模式 77 cache_enablecaching(cache_emifa_ce00); /使能emifa ce0空间 78 cache_enablecaching(cache_emifa_ce01); /使能emifa ce1空间 79 dat_open(dat_chaany, dat_pri_low, dat_open_2d); 80 81 82 /* 83 * = tskvideoloopback = 84 * video loopback function. 85 */ 86 87 void tskvideoloopback() 88 89 int i; 90 int status; 91 int frames = 0; 92 fvid_handle dischan; 93 fvid_frame *disframebuf; 94 fvid_handle capchan; 95 fvid_frame *capframebuf; 96 97 /*设置显示的行数 vga制式为480，pal制为576*/ 98 int numlinesdis = evmdm642_vdisparamschan.imgvsizefld1; 99 100 /*设置采集的行数 pal制为576*/ 101 int numlinescap = (evmdm642_vcapparamschan.fldystop1 - 102 evmdm642_vcapparamschan.fldystrt1+1)*2; 103 104 /*判断是显示区域大，还是采集区域大，取其小者480*/ 105 int numlines = (numlinesdis numlinescap) ? numlinescap : numlinesdis; 106 107 /*设置采集像素数 pal制为720*/ 108 int numpixels = (evmdm642_vcapparamschan.fldxstop1 - 109 evmdm642_vcapparamschan.fldxstrt1+1); 110 111 /*设置采集行的增量 pal制为720*/ 112 int caplinepitch = (evmdm642_vcapparamschan.fldxstop1 - 113 evmdm642_vcapparamschan.fldxstrt1+1); 114 115 /*设置显示行的增量 vga制为640*/ 116 int dislinepitch = evmdm642_vdisparamschan.imghsizefld1; 117 118 / numlines *= 2; /* both fields */ /如果输出为pal制，前面numlinescap不要*2，这里再*2 119 /*/ 120 /* allocate both capture and display frame buffers */ 121 /* in external heap memory */ 122 /*/ 123 evmdm642_vdisparamschan.segid = externalheap; 124 evmdm642_vdisparamssaa7105.hi2c = dec643_i2c_hi2c; 125 evmdm642_vcapparamschan.segid = externalheap; 126 evmdm642_vcapparamstvp51xx.hi2c = dec643_i2c_hi2c; 127 128 /*/ 129 /* initialization of capture driver */ 130 /*/ 131 capchan = fvid_create(/vp1capture/a/1, 132 iom_input, &status, (ptr)&evmdm642_vcapparamschan, null); 133 134 /*/ 135 /* initialization of display driver */ 136 /*/ 137 dischan = fvid_create(/vp2display, iom_output, 138 &status, (ptr)&evmdm642_vdisparamschan, null); 139 140 /*/ 141 /* configure video encoder & decoder */ 142 /*/ 143 fvid_control(dischan, vport_cmd_edc_base + edc_config, 144 (ptr)&evmdm642_vdisparamssaa7105); 145 fvid_control(capchan, vport_cmd_edc_base + edc_config, 146 (ptr)&evmdm642_vcapparamstvp51xx); 147 cache_clean(cache_l2all, 0, 0); /csl函数，冲洗cache 148 149 /*/ 150 /* start capture & display operation */ 151 /*/ 152 fvid_control(dischan, vport_cmd_start, null); 153 fvid_control(capchan, vport_cmd_start, null); 154 155 /*/ 156 /* request a frame buffer from display & capture driver */ 157 /*/ 158 fvid_alloc(dischan, &disframebuf); 159 fvid_alloc(capchan, &capframebuf); 160 frames +; 161 while(1) 162 /* loop forever */ 163 /*/ 164 /* copy data from capture buffer to display buffer */ 165 /*/ 166 for(i = 0; i frame.ifrm.y1 + i * (caplinepitch), 169 capframebuf-frame.ifrm.cb1 + (caplinepitch 1) * i, 170 capframebuf-frame.ifrm.cr1 + (caplinepitch 1) * i, 171 disframebuf-frame.rpfrm.buf + (dislinepitch frame.rpfrm, 177 evmdm642_vdisparamschan.imghsi