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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"
/*
VS_FRAME_UNCOMPRESSED : wWidth @ 5, wHeight @ 7, dwDefaultFrameInterval @ 21, bFrameIntervalType @ 25, intervals @ 26
VS_FRAME_MJPEG : wWidth @ 5, wHeight @ 7, dwDefaultFrameInterval @ 21, bFrameIntervalType @ 25, intervals @ 26
VS_FRAME_FRAME_BASED : wWidth @ 5, wHeight @ 7, dwDefaultFrameInterval @ 17, bFrameIntervalType @ 21, intervals @ 26
VS_FRAME_H264 : wWidth @ 4, wHeight @ 6, dwDefaultFrameInterval @ 39, bNumFrameIntervals @ 43, intervals @ 44
VS_FRAME_VP8 : wWidth @ 4, wHeight @ 6, dwDefaultFrameInterval @ 26, bNumFrameIntervals @ 30, intervals @ 31
*/
static const UCHAR _ux_host_class_video_frame_descriptor_offsets[][5] =
{
{ 5, 7, 21, 25, 26 },
{ 5, 7, 17, 21, 26 },
{ 4, 6, 39, 43, 44 },
{ 4, 6, 26, 30, 31 },
};
#define _OFFSETS_UNCOMPRESSED_MJPEG 0
#define _OFFSETS_FRAME_BASED 1
#define _OFFSETS_H264 2
#define _OFFSETS_VP8 3
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _ux_host_class_video_frame_data_get PORTABLE C */
/* 6.3.0 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function finds the frame data within the input terminal. */
/* */
/* INPUT */
/* */
/* video Pointer to video class */
/* frame_data Frame request structure */
/* */
/* OUTPUT */
/* */
/* Completion Status */
/* */
/* CALLS */
/* */
/* _ux_system_error_handler Log system error */
/* _ux_utility_descriptor_parse Parse descriptor */
/* */
/* CALLED BY */
/* */
/* Video Class */
/* */
/**************************************************************************/
UINT _ux_host_class_video_frame_data_get(UX_HOST_CLASS_VIDEO *video, UX_HOST_CLASS_VIDEO_PARAMETER_FRAME_DATA *frame_parameter)
{
UCHAR *descriptor;
ULONG total_descriptor_length;
ULONG descriptor_length;
ULONG descriptor_type;
ULONG descriptor_subtype;
UCHAR *field_offsets;
/* 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 : /* wWidth @ 5, wHeight @ 7, dwDefaultFrameInterval @ 21, bFrameIntervalType @ 25, intervals @ 26 */
case UX_HOST_CLASS_VIDEO_VS_FRAME_MJPEG : /* wWidth @ 5, wHeight @ 7, dwDefaultFrameInterval @ 21, bFrameIntervalType @ 25, intervals @ 26 */
case UX_HOST_CLASS_VIDEO_VS_FRAME_FRAME_BASED : /* wWidth @ 5, wHeight @ 7, dwDefaultFrameInterval @ 17, bFrameIntervalType @ 21, intervals @ 26 */
case UX_HOST_CLASS_VIDEO_VS_FRAME_H264 : /* wWidth @ 4, wHeight @ 6, dwDefaultFrameInterval @ 39, bNumFrameIntervals @ 43, intervals @ 44 */
case UX_HOST_CLASS_VIDEO_VS_FRAME_VP8 : /* wWidth @ 4, wHeight @ 6, dwDefaultFrameInterval @ 26, bNumFrameIntervals @ 30, intervals @ 31 */
/* We found a Frame descriptor. Is it the right one ? */
if (frame_parameter -> ux_host_class_video_parameter_frame_requested == *(descriptor + 3))
{
/* Get key offsets. */
if (descriptor_subtype == UX_HOST_CLASS_VIDEO_VS_FRAME_FRAME_BASED)
field_offsets = (UCHAR*)_ux_host_class_video_frame_descriptor_offsets[_OFFSETS_FRAME_BASED];
else if (descriptor_subtype == UX_HOST_CLASS_VIDEO_VS_FRAME_H264)
field_offsets = (UCHAR*)_ux_host_class_video_frame_descriptor_offsets[_OFFSETS_H264];
else if (descriptor_subtype == UX_HOST_CLASS_VIDEO_VS_FRAME_VP8)
field_offsets = (UCHAR*)_ux_host_class_video_frame_descriptor_offsets[_OFFSETS_VP8];
else
field_offsets = (UCHAR*)_ux_host_class_video_frame_descriptor_offsets[_OFFSETS_UNCOMPRESSED_MJPEG];
/* Save the frame subtype. */
frame_parameter -> ux_host_class_video_parameter_frame_subtype = descriptor_type;
/* Save useful frame parameters. */
frame_parameter -> ux_host_class_video_parameter_frame_width = _ux_utility_short_get(descriptor + field_offsets[0]);
frame_parameter -> ux_host_class_video_parameter_frame_height = _ux_utility_short_get(descriptor + field_offsets[1]);
frame_parameter -> ux_host_class_video_parameter_default_frame_interval = _ux_utility_long_get(descriptor + field_offsets[2]);
frame_parameter -> ux_host_class_video_parameter_frame_interval_type = *(descriptor + field_offsets[3]);
frame_parameter -> ux_host_class_video_parameter_frame_intervals = (descriptor + field_offsets[4]);
video -> ux_host_class_video_current_frame_address = descriptor;
video -> ux_host_class_video_current_frame_interval = frame_parameter -> ux_host_class_video_parameter_default_frame_interval;
/* 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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