1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
|
/***************************************************************************
* 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_input_terminal_get PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function finds the input terminal in the config descriptor. */
/* */
/* INPUT */
/* */
/* video Pointer to video class */
/* */
/* OUTPUT */
/* */
/* Completion Status */
/* */
/* CALLS */
/* */
/* _ux_system_error_handler System error log */
/* _ux_utility_descriptor_parse Parse descriptor */
/* */
/* CALLED BY */
/* */
/* Video Class */
/* */
/**************************************************************************/
UINT _ux_host_class_video_input_terminal_get(UX_HOST_CLASS_VIDEO *video)
{
UCHAR *descriptor;
UX_INTERFACE_DESCRIPTOR interface_descriptor;
UX_HOST_CLASS_VIDEO_INPUT_TERMINAL_DESCRIPTOR input_terminal_descriptor;
ULONG total_descriptor_length;
ULONG descriptor_length;
ULONG descriptor_type;
ULONG descriptor_subtype;
ULONG interface_found;
/* Get the descriptor to the selected format. */
descriptor = video -> ux_host_class_video_configuration_descriptor;
total_descriptor_length = video -> ux_host_class_video_configuration_descriptor_length;
/* Haven't found it yet. */
interface_found = UX_FALSE;
/* Scan the descriptor for the Video Streaming interface. */
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);
}
/* Process relative to descriptor type. */
switch (descriptor_type)
{
case UX_INTERFACE_DESCRIPTOR_ITEM:
/* Parse the interface descriptor and make it machine independent. */
_ux_utility_descriptor_parse(descriptor, _ux_system_interface_descriptor_structure,
UX_INTERFACE_DESCRIPTOR_ENTRIES, (UCHAR *) &interface_descriptor);
/* Ensure we have the correct interface for Video Control. */
if ((interface_descriptor.bInterfaceClass == UX_HOST_CLASS_VIDEO_CLASS) &&
(interface_descriptor.bInterfaceSubClass == UX_HOST_CLASS_VIDEO_SUBCLASS_CONTROL))
{
/* Mark we have found it. */
interface_found = UX_TRUE;
/* Get the interface number of this descriptor and save it in the video
instance. This will be useful to program the video controls. */
video -> ux_host_class_video_control_interface_number = interface_descriptor.bInterfaceNumber;
}
else
{
/* Haven't found it. */
interface_found = UX_FALSE;
}
break;
case UX_HOST_CLASS_VIDEO_CS_INTERFACE:
/* First make sure we have found the correct generic interface descriptor. */
if ((interface_found == UX_TRUE) && (descriptor_subtype == UX_HOST_CLASS_VIDEO_VC_INPUT_TERMINAL))
{
/* Parse the interface descriptor and make it machine independent. */
_ux_utility_descriptor_parse(descriptor, _ux_system_class_video_input_terminal_descriptor_structure,
UX_HOST_CLASS_VIDEO_INPUT_TERMINAL_DESCRIPTOR_ENTRIES, (UCHAR *) &input_terminal_descriptor);
/* Save the video terminal ID. */
video -> ux_host_class_video_terminal_id = input_terminal_descriptor.bTerminalID;
/* Save the video terminal type. */
video -> ux_host_class_video_terminal_type = input_terminal_descriptor.wTerminalType;
/* 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);
}
|
