I am having trouble configuring the VPFE resizer. I need to use it to resize frames from RAM to RAM. I can only get it to work at certain settings, none of which comply with the equations from sprue38b. Yet, I would like to compute the register settings based on some restricted user input.
The problem seems to be that the resizer will hang indefinitely if it is enabled with IN_SIZE values other than what it expects. But, without the exact equations for these values, I cannot reliably calculate the proper settings. To simplify things until I get the resizer working reliably, I tried to enable the resizer with a 1x setting. According to sprue38b, resizing to 1x, should use the 8-Phase, 4-tap mode and RSZ should be 256. Assuming spv=0, sph=0 and Ex=0 the equations from sprue38b Table 21 simplify to: iw=((ow-1)*256+16)>>8+7 ih=((oh-1)*256+16)>>8+4. So for example to get an output of 202x285 pixels, substitute ow=202 in the equation for iw yielding: iw=((202-1)256+16)>>8+7 iw=(51472)>>8 + 7 iw=201+7 iw=208 Similarly using oh=285 in the equation for ih yields: ih=((285-1)256+16)>>8+4 ih=(72720)>>8+4 ih=284+4 ih=288 So, I have: Register Value ------------------- ----- RSZ_CNT.HRSZ (hrsz) 256 RSZ_CNT.VRSZ (vrsz) 256 RSZ_CNT.HSTPH (sph) 0 RSZ_CNT.VSTPH (spv) 0 OUT_SIZE.HORZ (ow) 202 OUT_SIZE.VERT (oh) 285 IN_SIZE.HORZ (iw) 208 IN_SIZE.VERT (ih) 288 YENH.ALGO 0 But, this configuration hangs the resizer. I have attempted numerous other settings with mixed results. Listed below are some of the configurations I have tried with an indication if the resizer RAN or HUNG. Note that none of the combinations resulting in a running resizer satisfy the ih equation provided. Register Set 1 Set 2 Set 3 Set 4 Set 5 Set 6 Set 7 Set 8 ------------------- ----- ----- ----- ----- ----- ----- ----- ----- RSZ_CNT.HRSZ (hrsz) 256 256 256 256 147 147 256 256 RSZ_CNT.VRSZ (vrsz) 256 256 256 256 147 147 256 256 RSZ_CNT.HSTPH (sph) 0 0 0 0 0 0 0 0 RSZ_CNT.VSTPH (spv) 0 0 0 0 0 0 0 0 OUT_SIZE.HORZ (ow) 202 202 202 202 352 352 192 192 OUT_SIZE.VERT (oh) 285 287 285 287 492 492 275 275 IN_SIZE.HORZ (iw) 208 208 208 208 208 208 198 198 IN_SIZE.VERT (ih) 288 291 289 290 287 286 279 278 YENH.ALGO 0 0 0 0 0 0 0 0 RESIZER STATUS HUNG RAN RAN HUNG RAN HUNG RAN HUNG SATISFIES EQUATIONS YES NO NO YES NO YES NO YES The exact lines of C code I am using to compute iw and ih are listed below. I would greatly appreciate it if someone could show me what is wrong. The code exactly implements the equations provided (given the assumptions noted above). ih = (((oh - 1) * vrsz + 16) >> 8) + 4; iw = (((ow - 1) * hrsz + 16) >> 8) + 7; If anyone can point out my error I would greatly appreciate it. Thanks, Tony _______________________________________________ Davinci-linux-open-source mailing list Davinci-linux-open-source@linux.davincidsp.com http://linux.davincidsp.com/mailman/listinfo/davinci-linux-open-source
