Am 30.04.2010 21:31, schrieb Stefan Ringel:
> Am 30.04.2010 18:34, schrieb Stefan Ringel:
>
>> Hi Mauro,
>>
>> Today I'm writing directly to you, because it doesn't work the mailing
>> list. I thought over the calculating urb buffer and I have follow idea:
>>
>> buffer = endpoint fifo size (3072 Bytes) * block size (184 Bytes)
>>
>> The actually calculating is a video frame size (image = width * hight *
>> 2 Bytes/Pixel), so that this buffer has to begin and to end an
>> uncomplete block. followed blocks are setting the logic to an err_mgs
>> block, so that going to lost frames.
>>
>>
>>
> I forgot a log with old calculating.
>
>
--
Stefan Ringel <[email protected]>
tm6000
datagram from urb to videobuf
urb copy to temp copy to 1. videobuf
buffer 2. audiobuf
3. vbi
184 Packets -------> 184 * 3072 ----------> 4. etc.
a 3072 bytes bytes
184 * 3072 *
3072 bytes 180 bytes
(184 bytes - 4 bytes
header )
step 1
copy from urb to temp buffer
snip
----
for (i = 0; i < urb->number_of_packets; i++) {
int status = urb->iso_frame_desc[i].status;
if (status<0) {
print_err_status (dev,i,status);
continue;
}
len=urb->iso_frame_desc[i].actual_length;
memcpy (t_buf[i*len], urb->transfer_buffer[i*len], len);
copied += len;
if (copied >= size || !buf)
break;
}
if (!urb->iso_frame_desc[i].status) {
if ((buf->fmt->fourcc)==V4L2_PIX_FMT_TM6000) {
rc=copy_multiplexed(t_buf, outp, len, urb, &buf);
if (rc<=0)
return rc;
} else {
copy_streams(t_buf, outp, len, urb, &buf);
}
}
---
snip
step 2
copy from temp buffer into videobuffer
snip
---
for (i=0;i<3072;i++) {
switch(cmd) {
case TM6000_URB_MSG_VIDEO:
/* Fills video buffer */
memcpy(&out_p[(line << 1 + field) * block * 180],
ptr[(i*184)+4], 180);
printk (KERN_INFO "cmd=%s, size=%d\n",
tm6000_msg_type[cmd],size);
break;
case TM6000_URB_MSG_PTS:
printk (KERN_INFO "cmd=%s, size=%d\n",
tm6000_msg_type[cmd],size);
break;
case TM6000_URB_MSG_AUDIO:
/* Need some code to process audio */
printk ("%ld: cmd=%s, size=%d\n", jiffies,
tm6000_msg_type[cmd],size);
break;
default:
dprintk (dev, V4L2_DEBUG_ISOC, "cmd=%s, size=%d\n",
printk (KERN_INFO "cmd=%s, size=%d\n",
tm6000_msg_type[cmd],size);
}
}
}
---
snip
This is a schemata to copy in videobuf.
temp_buf = fifo size * block size
viodeobuf = hight * wight * 2
Questions
1. Is it right if I copy the block without header to videobufer?
2. Can I full the videobuffer have more temp_bufs?
3. How are the actually data schema from urb to videobuffer?
