The bulk transfer and search in big stream is very hard task for
processor. It is realy necesery to have bulk transfer?
See my new proposal for patch.
Brian Johnson wrote:
> This code is necessary for bulk transfers since when using bulk mode
> the header is not sent in a seperate packet by itself but is found
> inside a larger bulk packet. however sicne when using isoc which is
> the default the header is always a single 64 byte packet it should be
> ok to run that scan only if you currently have bulk mode enabled.
>
> 2009/4/12 Boris Borisov <[email protected]>:
>
>> Hello,
>> The hunger function is detect start of frame, because is perform many
>> comparation if received buffer is large than 64 bytes.
>> See the patch
>>
>>
>>
snip
--~--~---------~--~----~------------~-------~--~----~
Lets make microdia webcams plug'n play, (currently plug'n pray)
To post to this group, send email to [email protected]
Visit us online https://groups.google.com/group/microdia
-~----------~----~----~----~------~----~------~--~---
diff --git a/sn9c20x-usb.c b/sn9c20x-usb.c
index 4e7f1c7..ecec38d 100644
--- a/sn9c20x-usb.c
+++ b/sn9c20x-usb.c
@@ -501,12 +501,17 @@ int usb_sn9c20x_detect_frame(unsigned char *buf, unsigned
int buf_length)
else
return -1;
}
- for (index = 0; index < buf_length - 63; index++) {
- if (memcmp(buf + index, frame_header, 6) == 0) {
- UDIA_DEBUG("Found Header at %d\n", index);
- return index;
- }
- }
+
+ if(bulk)
+ {
+ for (index = 0; index < buf_length - 63; index++) {
+ if (memcmp(buf + index, frame_header, 6) == 0) {
+ UDIA_DEBUG("Found Header at %d\n", index);
+ return index;
+ }
+ }
+ }
+
return -1;
}
