feat(uvc): add NV12 format parsing

host/class/uvc/usb_host_uvc/CHANGELOG.md

@@ -7,9 +7,14 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Added
+
+- Added NV12 stream format parsing for UVC uncompressed descriptors.
+
 ### Fixed
 
 - Fixed regression from version 2.5.0 where unreasonably large URBs could be allocated, leading to out-of-memory scenarios. Now, if urb_size == 0, we allocate URB of size 4x MPS. For other urb_sizes, user's value is used to provide flexibility.
+- Fixed unsupported UVC formats leaking into the frame list when descriptor parsing returns an invalid format.
 
 ## [2.5.0] - 2026-04-13
 

host/class/uvc/usb_host_uvc/include/usb/uvc_host.h

@@ -45,6 +45,7 @@ enum uvc_host_stream_format {
     UVC_VS_FORMAT_YUY2,        /*!< YUY2 stream format. */
     UVC_VS_FORMAT_H264,        /*!< H.264 stream format. */
     UVC_VS_FORMAT_H265,        /*!< H.265 stream format. */
+    UVC_VS_FORMAT_NV12,        /*!< NV12 stream format. */
 };
 
 /**

host/class/uvc/usb_host_uvc/uvc_descriptor_parsing.c

@@ -166,6 +166,8 @@ int uvc_desc_parse_format(const uvc_format_desc_t *format_desc)
         // We do not check full guid, but only the first 4 characters that show human readable format
         if (strncmp(guid, "YUY2", 4) == 0) {
             ret = UVC_VS_FORMAT_YUY2;
+        } else if (strncmp(guid, "NV12", 4) == 0) {
+            ret = UVC_VS_FORMAT_NV12;
         }
         break;
     }
@@ -456,10 +458,11 @@ esp_err_t uvc_desc_get_frame_list(const usb_config_desc_t *config_desc, uint8_t
         }
 
         const uvc_format_desc_t *this_format = (const uvc_format_desc_t *)(current_desc);
-        enum uvc_host_stream_format format_type = uvc_desc_parse_format(this_format);
-        if (0 > format_type) { // Undefined format
+        int parsed_format = uvc_desc_parse_format(this_format);
+        if (parsed_format < 0) { // Undefined format
             continue;
         }
+        enum uvc_host_stream_format format_type = parsed_format;
 
         num_frame += this_format->bNumFrameDescriptors;
 
@@ -485,6 +488,7 @@ esp_err_t uvc_desc_get_frame_list(const usb_config_desc_t *config_desc, uint8_t
             frame_info->v_res = this_frame->wHeight;
             switch (format_type) {
             case UVC_VS_FORMAT_YUY2:
+            case UVC_VS_FORMAT_NV12:
             case UVC_VS_FORMAT_MJPEG:
                 frame_info->default_interval = this_frame->mjpeg_uncompressed.dwDefaultFrameInterval;
                 frame_info->interval_type = this_frame->mjpeg_uncompressed.bFrameIntervalType;