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
|
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "media/video/capture/win/sink_input_pin_win.h"
#include <cstring>
// Avoid including strsafe.h via dshow as it will cause build warnings.
#define NO_DSHOW_STRSAFE
#include <dshow.h>
#include "base/logging.h"
namespace media {
const REFERENCE_TIME kSecondsToReferenceTime = 10000000;
SinkInputPin::SinkInputPin(IBaseFilter* filter,
SinkFilterObserver* observer)
: observer_(observer),
PinBase(filter) {
memset(&requested_capability_, 0, sizeof(requested_capability_));
memset(&resulting_capability_, 0, sizeof(resulting_capability_));
}
SinkInputPin::~SinkInputPin() {}
bool SinkInputPin::GetValidMediaType(int index, AM_MEDIA_TYPE* media_type) {
if (media_type->cbFormat < sizeof(VIDEOINFOHEADER))
return false;
VIDEOINFOHEADER* pvi =
reinterpret_cast<VIDEOINFOHEADER*>(media_type->pbFormat);
ZeroMemory(pvi, sizeof(VIDEOINFOHEADER));
pvi->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
pvi->bmiHeader.biPlanes = 1;
pvi->bmiHeader.biClrImportant = 0;
pvi->bmiHeader.biClrUsed = 0;
if (requested_capability_.frame_rate > 0) {
pvi->AvgTimePerFrame = kSecondsToReferenceTime /
requested_capability_.frame_rate;
}
media_type->majortype = MEDIATYPE_Video;
media_type->formattype = FORMAT_VideoInfo;
media_type->bTemporalCompression = FALSE;
switch (index) {
case 0: {
pvi->bmiHeader.biCompression = MAKEFOURCC('I', '4', '2', '0');
pvi->bmiHeader.biBitCount = 12; // bit per pixel
pvi->bmiHeader.biWidth = requested_capability_.width;
pvi->bmiHeader.biHeight = requested_capability_.height;
pvi->bmiHeader.biSizeImage = 3 * requested_capability_.height *
requested_capability_.width / 2;
media_type->subtype = kMediaSubTypeI420;
break;
}
case 1: {
pvi->bmiHeader.biCompression = MAKEFOURCC('Y', 'U', 'Y', '2');
pvi->bmiHeader.biBitCount = 16;
pvi->bmiHeader.biWidth = requested_capability_.width;
pvi->bmiHeader.biHeight = requested_capability_.height;
pvi->bmiHeader.biSizeImage = 2 * requested_capability_.width *
requested_capability_.height;
media_type->subtype = MEDIASUBTYPE_YUY2;
break;
}
case 2: {
pvi->bmiHeader.biCompression = BI_RGB;
pvi->bmiHeader.biBitCount = 24;
pvi->bmiHeader.biWidth = requested_capability_.width;
pvi->bmiHeader.biHeight = requested_capability_.height;
pvi->bmiHeader.biSizeImage = 3 * requested_capability_.height *
requested_capability_.width;
media_type->subtype = MEDIASUBTYPE_RGB24;
break;
}
default:
return false;
}
media_type->bFixedSizeSamples = TRUE;
media_type->lSampleSize = pvi->bmiHeader.biSizeImage;
return true;
}
bool SinkInputPin::IsMediaTypeValid(const AM_MEDIA_TYPE* media_type) {
GUID type = media_type->majortype;
if (type != MEDIATYPE_Video)
return false;
GUID format_type = media_type->formattype;
if (format_type != FORMAT_VideoInfo)
return false;
// Check for the sub types we support.
GUID sub_type = media_type->subtype;
VIDEOINFOHEADER* pvi =
reinterpret_cast<VIDEOINFOHEADER*>(media_type->pbFormat);
if (pvi == NULL)
return false;
// Store the incoming width and height.
resulting_capability_.width = pvi->bmiHeader.biWidth;
resulting_capability_.height = abs(pvi->bmiHeader.biHeight);
if (pvi->AvgTimePerFrame > 0) {
resulting_capability_.frame_rate =
static_cast<int>(kSecondsToReferenceTime / pvi->AvgTimePerFrame);
} else {
resulting_capability_.frame_rate = requested_capability_.frame_rate;
}
if (sub_type == kMediaSubTypeI420 &&
pvi->bmiHeader.biCompression == MAKEFOURCC('I', '4', '2', '0')) {
resulting_capability_.color = VideoCaptureCapability::kI420;
return true; // This format is acceptable.
}
if (sub_type == MEDIASUBTYPE_YUY2 &&
pvi->bmiHeader.biCompression == MAKEFOURCC('Y', 'U', 'Y', '2')) {
resulting_capability_.color = VideoCaptureCapability::kYUY2;
return true; // This format is acceptable.
}
if (sub_type == MEDIASUBTYPE_RGB24 &&
pvi->bmiHeader.biCompression == BI_RGB) {
resulting_capability_.color = VideoCaptureCapability::kRGB24;
return true; // This format is acceptable.
}
return false;
}
HRESULT SinkInputPin::Receive(IMediaSample* sample) {
const int length = sample->GetActualDataLength();
uint8* buffer = NULL;
if (FAILED(sample->GetPointer(&buffer)))
return S_FALSE;
observer_->FrameReceived(buffer, length);
return S_OK;
}
void SinkInputPin::SetRequestedMediaCapability(
const VideoCaptureCapability& capability) {
requested_capability_ = capability;
resulting_capability_.width = 0;
resulting_capability_.height = 0;
resulting_capability_.frame_rate = 0;
resulting_capability_.color = VideoCaptureCapability::kColorUnknown;
resulting_capability_.expected_capture_delay = 0;
resulting_capability_.interlaced = false;
}
const VideoCaptureCapability& SinkInputPin::ResultingCapability() {
return resulting_capability_;
}
} // namespace media
|
