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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_read PORTABLE C */
/* 6.1.11 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function reads from the video streaming interface. */
/* */
/* Note if the transfer request is not linked (next pointer is NULL), */
/* a single request is performed. If the transfer request links into a */
/* list, the whole list is added. */
/* */
/* Note check ux_host_class_video_max_payload_get to see request */
/* length limitation. */
/* */
/* INPUT */
/* */
/* video Pointer to video class */
/* video_transfer_request Pointer to transfer request */
/* */
/* OUTPUT */
/* */
/* Completion Status */
/* */
/* CALLS */
/* */
/* _ux_host_class_video_transfer_request Video transfer request */
/* _ux_host_stack_class_instance_verify Verify instance is valid */
/* _ux_host_semaphore_get Get semaphore */
/* _ux_host_semaphore_put Put semaphore */
/* _ux_system_error_handler System error log */
/* */
/* CALLED BY */
/* */
/* Application */
/* Video Class */
/* */
/**************************************************************************/
UINT _ux_host_class_video_read(UX_HOST_CLASS_VIDEO *video, UX_HOST_CLASS_VIDEO_TRANSFER_REQUEST *video_transfer_request)
{
UINT status;
UX_HOST_CLASS_VIDEO_TRANSFER_REQUEST *transfer_list;
/* Ensure the instance is valid. */
if (_ux_host_stack_class_instance_verify(_ux_system_host_class_video_name, (VOID *) video) != UX_SUCCESS)
{
/* Error trap. */
_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_CLASS, UX_HOST_CLASS_INSTANCE_UNKNOWN);
return(UX_HOST_CLASS_INSTANCE_UNKNOWN);
}
/* Protect thread reentry to this instance. */
status = _ux_host_semaphore_get(&video -> ux_host_class_video_semaphore, UX_WAIT_FOREVER);
if (status != UX_SUCCESS)
return(status);
/* By default the transmission will be successful. */
status = UX_SUCCESS;
/* Ensure we have a selected interface that allows isoch transmission. */
if ((video -> ux_host_class_video_isochronous_endpoint == UX_NULL) ||
(video -> ux_host_class_video_isochronous_endpoint -> ux_endpoint_descriptor.wMaxPacketSize == 0))
{
/* Unprotect thread reentry to this instance. */
_ux_host_semaphore_put(&video -> ux_host_class_video_semaphore);
/* Error trap. */
_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_CLASS, UX_HOST_CLASS_VIDEO_WRONG_INTERFACE);
/* Return error status. */
return(UX_HOST_CLASS_VIDEO_WRONG_INTERFACE);
}
/* Save list head. */
transfer_list = video_transfer_request;
/* Ask the stack to hook this transfer request to the iso ED. */
status = _ux_host_class_video_transfer_request(video, transfer_list);
/* Unprotect thread reentry to this instance. */
_ux_host_semaphore_put(&video -> ux_host_class_video_semaphore);
/* Return completion status. */
return(status);
}
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _uxe_host_class_video_read PORTABLE C */
/* 6.3.0 */
/* AUTHOR */
/* */
/* Yajun Xia, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function checks errors in video read function call. */
/* */
/* INPUT */
/* */
/* video Pointer to video class */
/* video_transfer_request Pointer to transfer request */
/* */
/* OUTPUT */
/* */
/* Completion Status */
/* */
/* CALLS */
/* */
/* _ux_host_class_video_read Video read */
/* */
/* CALLED BY */
/* */
/* Application */
/* Video Class */
/* */
/**************************************************************************/
UINT _uxe_host_class_video_read(UX_HOST_CLASS_VIDEO *video, UX_HOST_CLASS_VIDEO_TRANSFER_REQUEST *video_transfer_request)
{
/* Sanity checks. */
if ((video == UX_NULL) || (video_transfer_request == UX_NULL))
return(UX_INVALID_PARAMETER);
/* Call the actual video read function. */
return(_ux_host_class_video_read(video, video_transfer_request));
}
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