Hello Bojan,
I will explain the whole procedure of changing video resolution dynamically with VLC media player
When AN75779 firmware is modified to add multiple resolution, on opening the host application (VLC) the options of the video resolutions supported by FX3 (as per modifications in the firmware) will be visible. Among the multiple resolutions one resolution will be set by default
1) To change the video resolution dynamically, one among the multiple resolutions shown in host application (VLC) need to be chosen.
2) On changing the video resolution, UVC class request will be sent by the host to FX3. Please refer to figure 6 of AN75779 and section 2.3.2.2 for the flow of the requests and response between host and device.
3) The UVC requests (sent by host) need to be handled in the firmware. Changing video resolution is for Streaming interface. Streaming interface can handle two requests CY_FX_UVC_PROBE_CTRL and CY_FX_UVC_COMMIT_CTRL requests.
- Please confirm that you are sending the probe control structures for all the video resolutions when this CY_FX_USB_UVC_GET_DEF_REQ request is sent by the host
- Under CY_FX_UVC_COMMIT_CTRL, when CY_FX_USB_UVC_SET_CUR_REQ occurs then appropriate sensor settings need to be change (according to the video resolution set) by the host
// UVC class request
if (wValue == FX3_UVC_VS_COMMIT_CONTROL)
{
switch(bRequest)
case FX3_USB_UVC_SET_CUR_REQ:
switch (CY_U3P_GET_LSB(wIndex))
{
case FX3_UVC_STREAM_INTERFACE_1:
{
CyU3PThreadSleep(900);
CyFx3UvcAppSetVideoResolution(glCommitCtrl[2], glCommitCtrl[3], frameInterval, 0);
}
break;
}
}
void
CyFx3UvcAppSetVideoResolution(
uint8_t format_index,
uint8_t resolution_index,
uint32_t frame_interval,
)
{
glFrameSizeExpected = 0;
if (CyU3PUsbGetSpeed() == CY_U3P_SUPER_SPEED)
{
if(format_index == UYVY_FORMAT_INDEX)
{
switch (resolution_index)
{
case SS_YUY2_1920x1080_INDEX:
sensor_settings_1920*1080(); //setting the sensor to stream 1920*1080
break;
case SS_YUY2_1280x720_INDEX:
sensor_settings_1280*720(); //setting the sensor to stream 1280*1720
break;
case SS_YUY2_640x640_INDEX:
sensor_settings_640x640();
break;
The fields like format_index, resolution_index etc needs to be parsed from glCommitCtrl when bRequest is CY_FX_USB_UVC_SET_CUR_REQ and wValue is CY_FX_UVC_PROBE_CTRL
Please share the modified firmware if you have more queries
Regards,
Rashi
Regards,
Rashi
