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/***************************************************************************
* Copyright (c) 2024 Microsoft Corporation
* Copyright (c) 2026-present Eclipse ThreadX contributors
*
* This program and the accompanying materials are made available under the
* terms of the MIT License which is available at
* https://opensource.org/licenses/MIT.
*
* SPDX-License-Identifier: MIT
**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** USBX Component */
/** */
/** Video Class */
/** */
/**************************************************************************/
/**************************************************************************/
/* Include necessary system files. */
#define UX_SOURCE_CODE
#include "ux_api.h"
#include "ux_host_class_video.h"
#include "ux_host_stack.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _ux_host_class_video_alternate_setting_locate PORTABLE C */
/* 6.1.12 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function finds the alternate setting for the specific format. */
/* */
/* INPUT */
/* */
/* video Pointer to video class */
/* alternate_setting Pointer to located alternate */
/* setting */
/* */
/* OUTPUT */
/* */
/* Completion Status */
/* */
/* CALLS */
/* */
/* _ux_system_error_handler Log system error */
/* */
/* CALLED BY */
/* */
/* Video Class */
/* */
/**************************************************************************/
UINT _ux_host_class_video_alternate_setting_locate(UX_HOST_CLASS_VIDEO *video, UINT max_payload_size, UINT *alternate_setting)
{
UX_CONFIGURATION *configuration;
UX_INTERFACE *interface_ptr;
UX_ENDPOINT *endpoint;
UINT streaming_interface;
UINT payload_size;
UINT current_payload_size = 0;
UINT alternate_setting_found;
configuration = video -> ux_host_class_video_streaming_interface -> ux_interface_configuration;
interface_ptr = configuration -> ux_configuration_first_interface;
streaming_interface = video -> ux_host_class_video_streaming_interface -> ux_interface_descriptor.bInterfaceNumber;
alternate_setting_found = UX_FALSE;
/* Scan all interfaces. */
while (interface_ptr != UX_NULL)
{
/* Search for the streaming interface with a endpoint. */
if ((interface_ptr -> ux_interface_descriptor.bInterfaceNumber == streaming_interface) &&
(interface_ptr -> ux_interface_first_endpoint != 0))
{
/* Get the max packet size of the endpoint. */
endpoint = interface_ptr -> ux_interface_first_endpoint;
payload_size = endpoint -> ux_endpoint_transfer_request.ux_transfer_request_packet_length;
/* Check if the payload size is equal or greater than the required payload size. */
if (payload_size >= max_payload_size)
{
/* Check if we have found any alternate settings yet. */
if(alternate_setting_found == UX_FALSE)
{
/* Save the current payload size and mark the found flag. */
alternate_setting_found = UX_TRUE;
current_payload_size = payload_size;
/* Save the found alternate setting number. */
*alternate_setting = interface_ptr -> ux_interface_descriptor.bAlternateSetting;
}
else
{
/* Check if the payload size is smaller. */
if (payload_size < current_payload_size)
{
/* Smaller payload size found, select the current setting. */
current_payload_size = payload_size;
/* Save the found alternate setting number. */
*alternate_setting = interface_ptr -> ux_interface_descriptor.bAlternateSetting;
}
}
}
}
/* Move to next interface. */
interface_ptr = interface_ptr -> ux_interface_next_interface;
}
/* Check if we found the alternate setting. */
if (alternate_setting_found)
{
/* Return successful completion. */
return(UX_SUCCESS);
}
/* Error trap. */
_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_CLASS, UX_HOST_CLASS_VIDEO_WRONG_TYPE);
/* We get here when either the report descriptor has a problem or we could
not find the right video device. */
return(UX_HOST_CLASS_VIDEO_WRONG_TYPE);
}
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