common/usbx_host_classes/src/ux_host_class_video_start.c


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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_start                          PORTABLE C      */
/*                                                           6.1          */
/*  AUTHOR                                                                */
/*                                                                        */
/*    Chaoqiong Xiao, Microsoft Corporation                               */
/*                                                                        */
/*  DESCRIPTION                                                           */
/*                                                                        */
/*    This function starts the video streaming.                           */
/*                                                                        */
/*  INPUT                                                                 */
/*                                                                        */
/*    video                                 Pointer to video class        */
/*                                                                        */
/*  OUTPUT                                                                */
/*                                                                        */
/*    Completion Status                                                   */
/*                                                                        */
/*  CALLS                                                                 */
/*                                                                        */
/*    _ux_host_class_video_channel_start    Start video device            */
/*                                                                        */
/*  CALLED BY                                                             */
/*                                                                        */
/*    Application                                                         */
/*                                                                        */
/**************************************************************************/
UINT  _ux_host_class_video_start(UX_HOST_CLASS_VIDEO *video)
{

UX_HOST_CLASS_VIDEO_PARAMETER_CHANNEL       channel_parameter;
UINT                                        status;


    /* Get current parameters from the video instance.  */
    channel_parameter.ux_host_class_video_parameter_format_requested = video -> ux_host_class_video_current_format;
    channel_parameter.ux_host_class_video_parameter_frame_requested = video -> ux_host_class_video_current_frame;
    channel_parameter.ux_host_class_video_parameter_frame_interval_requested = video -> ux_host_class_video_current_frame_interval;
    channel_parameter.ux_host_class_video_parameter_channel_bandwidth_selection = 0;

    /* Start the video with the parameters.  */
    status = _ux_host_class_video_channel_start(video, &channel_parameter);

    /* Reset indices for transfer requests.  */
    video -> ux_host_class_video_transfer_request_start_index = 0;
    video -> ux_host_class_video_transfer_request_end_index = 0;

    /* Return status.  */
    return(status);
}

/**************************************************************************/
/*                                                                        */
/*  FUNCTION                                               RELEASE        */
/*                                                                        */
/*    _uxe_host_class_video_start                         PORTABLE C      */
/*                                                           6.3.0        */
/*  AUTHOR                                                                */
/*                                                                        */
/*    Yajun Xia, Microsoft Corporation                                    */
/*                                                                        */
/*  DESCRIPTION                                                           */
/*                                                                        */
/*    This function checks errors in video start function call.           */
/*                                                                        */
/*  INPUT                                                                 */
/*                                                                        */
/*    video                                 Pointer to video class        */
/*                                                                        */
/*  OUTPUT                                                                */
/*                                                                        */
/*    Completion Status                                                   */
/*                                                                        */
/*  CALLS                                                                 */
/*                                                                        */
/*    _ux_host_class_video_start            Video start                   */
/*                                                                        */
/*  CALLED BY                                                             */
/*                                                                        */
/*    Application                                                         */
/*                                                                        */
/**************************************************************************/
UINT  _uxe_host_class_video_start(UX_HOST_CLASS_VIDEO *video)
{

    /* Sanity checks.  */
    if (video == UX_NULL)
        return(UX_INVALID_PARAMETER);

    /* Call the actual video start function.  */
    return(_ux_host_class_video_start(video));
}