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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_frame_interval_get PORTABLE C */
/* 6.1.2 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function finds the frame intervals within the frame. */
/* */
/* INPUT */
/* */
/* video Pointer to video class */
/* interval_parameter Interval request structure */
/* */
/* OUTPUT */
/* */
/* Completion Status */
/* */
/* CALLS */
/* */
/* _ux_system_error_handler Log system error */
/* _ux_utility_descriptor_parse Parse descriptor */
/* _ux_utility_long_get Get 32-bit value */
/* */
/* CALLED BY */
/* */
/* Video Class */
/* */
/**************************************************************************/
UINT _ux_host_class_video_frame_interval_get(UX_HOST_CLASS_VIDEO *video, UX_HOST_CLASS_VIDEO_PARAMETER_FRAME_INTERVAL *interval_parameter)
{
UCHAR *descriptor;
UX_HOST_CLASS_VIDEO_FRAME_DESCRIPTOR frame_descriptor;
ULONG total_descriptor_length;
ULONG descriptor_length;
ULONG descriptor_type;
ULONG descriptor_subtype;
ULONG intervals_to_copy;
ULONG i;
/* Get the descriptor to the selected format. */
descriptor = video -> ux_host_class_video_current_format_address;
total_descriptor_length = video -> ux_host_class_video_length_formats;
/* Descriptors are arranged in order. First FORMAT then FRAME. */
while (total_descriptor_length)
{
/* Gather the length, type and subtype of the descriptor. */
descriptor_length = *descriptor;
descriptor_type = *(descriptor + 1);
descriptor_subtype = *(descriptor + 2);
/* Make sure this descriptor has at least the minimum length. */
if (descriptor_length < 3)
{
/* Error trap. */
_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_CLASS, UX_DESCRIPTOR_CORRUPTED);
/* If trace is enabled, insert this event into the trace buffer. */
//UX_TRACE_IN_LINE_INSERT(UX_TRACE_ERROR, UX_DESCRIPTOR_CORRUPTED, descriptor, 0, 0, UX_TRACE_ERRORS, 0, 0)
return(UX_DESCRIPTOR_CORRUPTED);
}
/* Must be CS_INTERFACE. */
if (descriptor_type == UX_HOST_CLASS_VIDEO_CS_INTERFACE)
{
/* Process relative to descriptor type. */
switch (descriptor_subtype)
{
case UX_HOST_CLASS_VIDEO_VS_FRAME_UNCOMPRESSED :
case UX_HOST_CLASS_VIDEO_VS_FRAME_MJPEG :
case UX_HOST_CLASS_VIDEO_VS_FRAME_FRAME_BASED :
/* We found a Frame descriptor. Is it the right one ? */
if (interval_parameter -> ux_host_class_video_parameter_frame_requested == *(descriptor + 3))
{
/* Make the descriptor machine independent. */
_ux_utility_descriptor_parse(descriptor, _ux_system_class_video_frame_descriptor_structure,
UX_HOST_CLASS_VIDEO_FRAME_DESCRIPTOR_ENTRIES, (UCHAR *) &frame_descriptor);
/* Check the frame interval type. */
if (frame_descriptor.bFrameIntervalType == 0)
{
/* Frame type is continuous, copy Min, Max and Step. */
intervals_to_copy = 3;
}
else
{
/* Frame type is discrete, copy number of frame intervals. */
intervals_to_copy = frame_descriptor.bFrameIntervalType;
}
/* Check if we have enough space to copy. */
if (intervals_to_copy * sizeof(ULONG) > interval_parameter -> ux_host_class_video_parameter_frame_interval_buffer_length)
{
intervals_to_copy = (ULONG)(interval_parameter -> ux_host_class_video_parameter_frame_interval_buffer_length / sizeof(ULONG));
}
/* Return bytes copied. */
interval_parameter -> ux_host_class_video_parameter_frame_interval_buffer_length_written = (ULONG)(intervals_to_copy * sizeof(ULONG));
/* Loop to copy interval data. */
for (i = 0; i < intervals_to_copy; i++)
{
/* Copy intervals to user buffer. */
interval_parameter -> ux_host_class_video_parameter_frame_interval_buffer[i] =
_ux_utility_long_get(descriptor + 26 + i * sizeof(ULONG));
}
/* We are done here. */
return(UX_SUCCESS);
}
break;
}
}
/* Verify if the descriptor is still valid. */
if (descriptor_length > total_descriptor_length)
{
/* Error trap. */
_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_CLASS, UX_DESCRIPTOR_CORRUPTED);
/* If trace is enabled, insert this event into the trace buffer. */
//UX_TRACE_IN_LINE_INSERT(UX_TRACE_ERROR, UX_DESCRIPTOR_CORRUPTED, descriptor, 0, 0, UX_TRACE_ERRORS, 0, 0)
return(UX_DESCRIPTOR_CORRUPTED);
}
/* Jump to the next descriptor if we have not reached the end. */
descriptor += descriptor_length;
/* And adjust the length left to parse in the descriptor. */
total_descriptor_length -= descriptor_length;
}
/* 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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