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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_channel_start PORTABLE C */
/* 6.1.12 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function starts the video channel. */
/* */
/* INPUT */
/* */
/* video Pointer to video class */
/* channel_parameter Pointer to video channel */
/* */
/* OUTPUT */
/* */
/* Completion Status */
/* */
/* CALLS */
/* */
/* _ux_host_class_video_alternate_setting_locate */
/* Search alternate setting */
/* _ux_host_stack_interface_setting_select */
/* Select alternate setting */
/* _ux_host_stack_interface_endpoint_get Get interface endpoint */
/* _ux_host_stack_transfer_request Process transfer request */
/* _ux_host_semaphore_get Get semaphore */
/* _ux_host_semaphore_put Release semaphore */
/* _ux_utility_memory_allocate Allocate memory block */
/* _ux_utility_memory_free Release memory block */
/* _ux_utility_long_get Get 32-bit value */
/* */
/* CALLED BY */
/* */
/* Video Class */
/* */
/**************************************************************************/
UINT _ux_host_class_video_channel_start(UX_HOST_CLASS_VIDEO *video, UX_HOST_CLASS_VIDEO_PARAMETER_CHANNEL *video_parameter)
{
UX_ENDPOINT *control_endpoint;
UX_TRANSFER *transfer_request;
UINT status;
UCHAR *control_buffer;
UINT alternate_setting;
UX_CONFIGURATION *configuration;
UX_INTERFACE *interface_ptr;
UX_ENDPOINT *endpoint;
ULONG endpoint_index;
UINT streaming_interface;
UINT max_payload_size;
/* Protect thread reentry to this instance. */
status = _ux_host_semaphore_get(&video -> ux_host_class_video_semaphore, UX_WAIT_FOREVER);
/* We need to get the default control endpoint transfer request pointer. */
control_endpoint = &video -> ux_host_class_video_device -> ux_device_control_endpoint;
transfer_request = &control_endpoint -> ux_endpoint_transfer_request;
/* Get the interface number of the video streaming interface. */
streaming_interface = video -> ux_host_class_video_streaming_interface -> ux_interface_descriptor.bInterfaceNumber;
/* Need to allocate memory for the control_buffer. */
control_buffer = _ux_utility_memory_allocate(UX_SAFE_ALIGN, UX_CACHE_SAFE_MEMORY, UX_HOST_CLASS_VIDEO_PROBE_COMMIT_LENGTH);
if (control_buffer == UX_NULL)
{
/* Unprotect thread reentry to this instance. */
_ux_host_semaphore_put(&video -> ux_host_class_video_semaphore);
/* Return error. */
return(UX_MEMORY_INSUFFICIENT);
}
/* Check the result, did we find the alternate setting ? */
if (status == UX_SUCCESS)
{
*(control_buffer + UX_HOST_CLASS_VIDEO_PROBE_COMMIT_FORMAT_INDEX) = (UCHAR)video_parameter -> ux_host_class_video_parameter_format_requested;
*(control_buffer + UX_HOST_CLASS_VIDEO_PROBE_COMMIT_FRAME_INDEX) = (UCHAR)video_parameter -> ux_host_class_video_parameter_frame_requested;
_ux_utility_long_put(control_buffer + UX_HOST_CLASS_VIDEO_PROBE_COMMIT_FRAME_INTERVAL,
video_parameter -> ux_host_class_video_parameter_frame_interval_requested);
/* Create a transfer request for the GET_CUR_buffer request. */
transfer_request -> ux_transfer_request_data_pointer = control_buffer;
transfer_request -> ux_transfer_request_requested_length = UX_HOST_CLASS_VIDEO_PROBE_COMMIT_LENGTH;
transfer_request -> ux_transfer_request_function = UX_HOST_CLASS_VIDEO_SET_CUR;
transfer_request -> ux_transfer_request_type = UX_REQUEST_OUT | UX_REQUEST_TYPE_CLASS | UX_REQUEST_TARGET_INTERFACE;
transfer_request -> ux_transfer_request_value = UX_HOST_CLASS_VIDEO_VS_PROBE_CONTROL << 8;
transfer_request -> ux_transfer_request_index = streaming_interface;
/* Send request to HCD layer. */
status = _ux_host_stack_transfer_request(transfer_request);
/* Check for correct transfer. Buffer may not be all what we asked for. */
if (status == UX_SUCCESS)
{
/* Create a transfer request for the SET_CUR_buffer request. */
transfer_request -> ux_transfer_request_data_pointer = control_buffer;
transfer_request -> ux_transfer_request_requested_length = UX_HOST_CLASS_VIDEO_PROBE_COMMIT_LENGTH;
transfer_request -> ux_transfer_request_function = UX_HOST_CLASS_VIDEO_GET_CUR;
transfer_request -> ux_transfer_request_type = UX_REQUEST_IN | UX_REQUEST_TYPE_CLASS | UX_REQUEST_TARGET_INTERFACE;
transfer_request -> ux_transfer_request_value = UX_HOST_CLASS_VIDEO_VS_PROBE_CONTROL << 8;
transfer_request -> ux_transfer_request_index = streaming_interface;
/* Send request to HCD layer. */
status = _ux_host_stack_transfer_request(transfer_request);
/* Check for correct transfer. */
if (status == UX_SUCCESS)
{
/* We did the GET_CUR and SET_CUR for Probe Control. Now we can commit to the bandwidth. */
/* Create a transfer request for the SET_CUR_buffer request. */
transfer_request -> ux_transfer_request_data_pointer = control_buffer;
transfer_request -> ux_transfer_request_requested_length = UX_HOST_CLASS_VIDEO_PROBE_COMMIT_LENGTH;
transfer_request -> ux_transfer_request_function = UX_HOST_CLASS_VIDEO_SET_CUR;
transfer_request -> ux_transfer_request_type = UX_REQUEST_OUT | UX_REQUEST_TYPE_CLASS | UX_REQUEST_TARGET_INTERFACE;
transfer_request -> ux_transfer_request_value = UX_HOST_CLASS_VIDEO_VS_COMMIT_CONTROL << 8;
transfer_request -> ux_transfer_request_index = streaming_interface;
/* Send request to HCD layer. */
status = _ux_host_stack_transfer_request(transfer_request);
/* Check for correct transfer. */
if (status == UX_SUCCESS)
{
/* Check if user has request specific bandwidth selection. */
if (video_parameter -> ux_host_class_video_parameter_channel_bandwidth_selection == 0)
{
/* Get the max payload transfer size returned from video device. */
max_payload_size = _ux_utility_long_get(control_buffer + UX_HOST_CLASS_VIDEO_PROBE_COMMIT_MAX_PAYLOAD_TRANSFER_SIZE);
}
else
{
/* Set the max payload transfer size to the user requested one. */
max_payload_size = video_parameter -> ux_host_class_video_parameter_channel_bandwidth_selection;
}
/* Search for the non zero alternate setting of the video stream. */
status = _ux_host_class_video_alternate_setting_locate(video, max_payload_size, &alternate_setting);
if (status == UX_SUCCESS)
{
/* Now the Commit has been done, the alternate setting can be requested. */
/* We found the alternate setting for the sampling values demanded, now we need
to search its container. */
configuration = video -> ux_host_class_video_streaming_interface -> ux_interface_configuration;
interface_ptr = configuration -> ux_configuration_first_interface;
/* Scan all interfaces. */
while (interface_ptr != UX_NULL)
{
/* We search for both the right interface and alternate setting. */
if ((interface_ptr -> ux_interface_descriptor.bInterfaceNumber == streaming_interface) &&
(interface_ptr -> ux_interface_descriptor.bAlternateSetting == alternate_setting))
{
/* We have found the right interface/alternate setting combination
The stack will select it for us. */
status = _ux_host_stack_interface_setting_select(interface_ptr);
/* If the alternate setting for the streaming interface could be selected, we memorize it. */
if (status == UX_SUCCESS)
{
/* Memorize the interface. */
video -> ux_host_class_video_streaming_interface = interface_ptr;
/* We need to research the isoch endpoint now. */
for (endpoint_index = 0; endpoint_index < interface_ptr -> ux_interface_descriptor.bNumEndpoints; endpoint_index++)
{
/* Get the list of endpoints one by one. */
status = _ux_host_stack_interface_endpoint_get(video -> ux_host_class_video_streaming_interface,
endpoint_index, &endpoint);
/* Check completion status. */
if (status == UX_SUCCESS)
{
/* Check if endpoint is ISOCH, regardless of the direction. */
if ((endpoint -> ux_endpoint_descriptor.bmAttributes & UX_MASK_ENDPOINT_TYPE) == UX_ISOCHRONOUS_ENDPOINT)
{
/* We have found the isoch endpoint, save it. */
video -> ux_host_class_video_isochronous_endpoint = endpoint;
/* Save the max payload size.
It's not exceeding endpoint bandwidth since the interface alternate
setting is located by max payload size. */
video -> ux_host_class_video_current_max_payload_size = max_payload_size;
/* Free all used resources. */
_ux_utility_memory_free(control_buffer);
/* Unprotect thread reentry to this instance. */
_ux_host_semaphore_put(&video -> ux_host_class_video_semaphore);
/* Return successful completion. */
return(UX_SUCCESS);
}
}
}
}
}
/* Move to next interface. */
interface_ptr = interface_ptr -> ux_interface_next_interface;
}
}
}
}
}
}
/* Free all used resources. */
_ux_utility_memory_free(control_buffer);
/* Unprotect thread reentry to this instance. */
_ux_host_semaphore_put(&video -> ux_host_class_video_semaphore);
/* Return completion status. */
return(status);
}
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