1 /***************************************************************************
2 * Copyright (c) 2024 Microsoft Corporation
3 *
4 * This program and the accompanying materials are made available under the
5 * terms of the MIT License which is available at
6 * https://opensource.org/licenses/MIT.
7 *
8 * SPDX-License-Identifier: MIT
9 **************************************************************************/
10
11 /**************************************************************************/
12 /**************************************************************************/
13 /** */
14 /** USBX Component */
15 /** */
16 /** Device Video Class */
17 /** */
18 /**************************************************************************/
19 /**************************************************************************/
20
21 #define UX_SOURCE_CODE
22
23
24 /* Include necessary system files. */
25
26 #include "ux_api.h"
27 #include "ux_device_class_video.h"
28 #include "ux_device_stack.h"
29
30
31 /**************************************************************************/
32 /* */
33 /* FUNCTION RELEASE */
34 /* */
35 /* _ux_device_class_video_write_payload_get PORTABLE C */
36 /* 6.3.0 */
37 /* AUTHOR */
38 /* */
39 /* Chaoqiong Xiao, Microsoft Corporation */
40 /* */
41 /* DESCRIPTION */
42 /* */
43 /* This function get a writable payload buffer in the Video class. */
44 /* */
45 /* INPUT */
46 /* */
47 /* stream Address of video stream */
48 /* instance */
49 /* payload Pointer to buffer to save */
50 /* payload buffer pointer */
51 /* length Pointer to save payload */
52 /* buffer length in bytes */
53 /* */
54 /* OUTPUT */
55 /* */
56 /* None */
57 /* */
58 /* CALLS */
59 /* */
60 /* */
61 /* CALLED BY */
62 /* */
63 /* Application */
64 /* */
65 /* RELEASE HISTORY */
66 /* */
67 /* DATE NAME DESCRIPTION */
68 /* */
69 /* 04-25-2022 Chaoqiong Xiao Initial Version 6.1.11 */
70 /* 10-31-2023 Yajun Xia Modified comment(s), */
71 /* resulting in version 6.3.0 */
72 /* */
73 /**************************************************************************/
_ux_device_class_video_write_payload_get(UX_DEVICE_CLASS_VIDEO_STREAM * stream,UCHAR ** payload,ULONG * length)74 UINT _ux_device_class_video_write_payload_get(UX_DEVICE_CLASS_VIDEO_STREAM *stream, UCHAR **payload, ULONG *length)
75 {
76
77 UX_SLAVE_ENDPOINT *endpoint;
78 UX_SLAVE_DEVICE *device;
79
80
81 /* Get the pointer to the device. */
82 device = &_ux_system_slave -> ux_system_slave_device;
83
84 /* As long as the device is in the CONFIGURED state. */
85 if (device -> ux_slave_device_state != UX_DEVICE_CONFIGURED)
86 {
87
88 /* Cannot proceed with command, the interface is down. */
89 return(UX_CONFIGURATION_HANDLE_UNKNOWN);
90 }
91
92 /* Check if endpoint is available. */
93 endpoint = stream -> ux_device_class_video_stream_endpoint;
94 if (endpoint == UX_NULL)
95 return(UX_ERROR);
96
97 /* Check if endpoint direction is OK. */
98 if ((endpoint -> ux_slave_endpoint_descriptor.bEndpointAddress & UX_ENDPOINT_DIRECTION) == UX_ENDPOINT_OUT)
99 return(UX_ERROR);
100
101 /* Check overflow!! */
102 if (stream -> ux_device_class_video_stream_access_pos == stream -> ux_device_class_video_stream_transfer_pos &&
103 stream -> ux_device_class_video_stream_access_pos -> ux_device_class_video_payload_length != 0)
104 return(UX_BUFFER_OVERFLOW);
105
106 /* Store payload buffer pointer. */
107 *payload = stream -> ux_device_class_video_stream_access_pos -> ux_device_class_video_payload_data;
108
109 /* Exclude header size in payload buffer size. */
110 *length = (stream -> ux_device_class_video_stream_payload_buffer_size - 4);
111
112 return(UX_SUCCESS);
113 }
114
115 /**************************************************************************/
116 /* */
117 /* FUNCTION RELEASE */
118 /* */
119 /* _uxe_device_class_video_write_payload_get PORTABLE C */
120 /* 6.3.0 */
121 /* AUTHOR */
122 /* */
123 /* Yajun Xia, Microsoft Corporation */
124 /* */
125 /* DESCRIPTION */
126 /* */
127 /* This function checks errors in video write payload get function */
128 /* call. */
129 /* */
130 /* INPUT */
131 /* */
132 /* stream Address of video stream */
133 /* instance */
134 /* payload Pointer to buffer to save */
135 /* payload buffer pointer */
136 /* length Pointer to save payload */
137 /* buffer length in bytes */
138 /* */
139 /* OUTPUT */
140 /* */
141 /* None */
142 /* */
143 /* CALLS */
144 /* */
145 /* _ux_device_class_video_write_payload_get */
146 /* Video write payload get */
147 /* */
148 /* CALLED BY */
149 /* */
150 /* Application */
151 /* */
152 /* RELEASE HISTORY */
153 /* */
154 /* DATE NAME DESCRIPTION */
155 /* */
156 /* 10-31-2023 Yajun Xia Initial Version 6.3.0 */
157 /* */
158 /**************************************************************************/
_uxe_device_class_video_write_payload_get(UX_DEVICE_CLASS_VIDEO_STREAM * stream,UCHAR ** payload,ULONG * length)159 UINT _uxe_device_class_video_write_payload_get(UX_DEVICE_CLASS_VIDEO_STREAM *stream, UCHAR **payload, ULONG *length)
160 {
161
162 /* Sanity check. */
163 if ((stream == UX_NULL) || (payload == UX_NULL) || (length == UX_NULL))
164 return(UX_INVALID_PARAMETER);
165
166 /* Call the actual video write payload get function. */
167 return(_ux_device_class_video_write_payload_get(stream, payload, length));
168 }
