media/capture/video/fake_video_capture_device_factory.cc - Issue 2214533002: move //media/capture to //device/capture

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Issue 2214533002: move //media/capture to //device/capture (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master

Patch Set: Created 4 years, 4 months ago

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1 // Copyright 2014 The Chromium Authors. All rights reserved.

2 // Use of this source code is governed by a BSD-style license that can be

3 // found in the LICENSE file.

4

5 #include "media/capture/video/fake_video_capture_device_factory.h"

6

7 #include "base/command_line.h"

8 #include "base/strings/string_number_conversions.h"

9 #include "base/strings/string_split.h"

10 #include "base/strings/string_tokenizer.h"

11 #include "base/strings/string_util.h"

12 #include "base/strings/stringprintf.h"

13 #include "build/build_config.h"

14 #include "media/base/media_switches.h"

15

16 namespace media {

17

18 // Cap the frame rate command line input to reasonable values.

19 static const float kFakeCaptureMinFrameRate = 5.0f;

20 static const float kFakeCaptureMaxFrameRate = 60.0f;

21 // Default rate if none is specified as part of the command line.

22 static const float kFakeCaptureDefaultFrameRate = 20.0f;

23

24 FakeVideoCaptureDeviceFactory::FakeVideoCaptureDeviceFactory()

25 : number_of_devices_(1),

26 fake_vcd_ownership_(FakeVideoCaptureDevice::BufferOwnership::OWN_BUFFERS),

27 frame_rate_(kFakeCaptureDefaultFrameRate) {}

28

29 std::unique_ptr<VideoCaptureDevice> FakeVideoCaptureDeviceFactory::CreateDevice(

30 const VideoCaptureDeviceDescriptor& device_descriptor) {

31 DCHECK(thread_checker_.CalledOnValidThread());

32

33 parse_command_line();

34

35 for (int n = 0; n < number_of_devices_; ++n) {

36 std::string possible_id = base::StringPrintf("/dev/video%d", n);

37 if (device_descriptor.device_id.compare(possible_id) == 0) {

38 return std::unique_ptr<VideoCaptureDevice>(

39 new FakeVideoCaptureDevice(fake_vcd_ownership_, frame_rate_));

40 }

41 }

42 return std::unique_ptr<VideoCaptureDevice>();

43 }

44

45 void FakeVideoCaptureDeviceFactory::GetDeviceDescriptors(

46 VideoCaptureDeviceDescriptors* device_descriptors) {

47 DCHECK(thread_checker_.CalledOnValidThread());

48 DCHECK(device_descriptors->empty());

49 for (int n = 0; n < number_of_devices_; ++n) {

50 device_descriptors->emplace_back(base::StringPrintf("fake_device_%d", n),

51 base::StringPrintf("/dev/video%d", n),

52 #if defined(OS_LINUX)

53 VideoCaptureApi::LINUX_V4L2_SINGLE_PLANE

54 #elif defined(OS_MACOSX)

55 VideoCaptureApi::MACOSX_AVFOUNDATION

56 #elif defined(OS_WIN)

57 VideoCaptureApi::WIN_DIRECT_SHOW

58 #elif defined(OS_ANDROID)

59 VideoCaptureApi::ANDROID_API2_LEGACY

60 #endif

61 );

62 }

63 }

64

65 void FakeVideoCaptureDeviceFactory::GetSupportedFormats(

66 const VideoCaptureDeviceDescriptor& device_descriptor,

67 VideoCaptureFormats* supported_formats) {

68 DCHECK(thread_checker_.CalledOnValidThread());

69 const gfx::Size supported_sizes[] = {gfx::Size(320, 240),

70 gfx::Size(640, 480),

71 gfx::Size(1280, 720),

72 gfx::Size(1920, 1080)};

73 supported_formats->clear();

74 for (const auto& size : supported_sizes) {

75 supported_formats->push_back(

76 VideoCaptureFormat(size, frame_rate_, media::PIXEL_FORMAT_I420));

77 }

78 }

79

80 // Optional comma delimited parameters to the command line can specify buffer

81 // ownership, buffer planarity, and the fake video device FPS.

82 // Examples: "ownership=client, planarity=triplanar, fps=60" "fps=30"

83 void FakeVideoCaptureDeviceFactory::parse_command_line() {

84 const std::string option =

85 base::CommandLine::ForCurrentProcess()->GetSwitchValueASCII(

86 switches::kUseFakeDeviceForMediaStream);

87 base::StringTokenizer option_tokenizer(option, ", ");

88 option_tokenizer.set_quote_chars("\"");

89

90 while (option_tokenizer.GetNext()) {

91 std::vector<std::string> param =

92 base::SplitString(option_tokenizer.token(), "=", base::TRIM_WHITESPACE,

93 base::SPLIT_WANT_NONEMPTY);

94

95 if (param.size() != 2u) {

96 LOG(WARNING) << "Forget a value '" << option << "'? Use name=value for "

97 << switches::kUseFakeDeviceForMediaStream << ".";

98 return;

99 }

100

101 if (base::EqualsCaseInsensitiveASCII(param.front(), "ownership") &&

102 base::EqualsCaseInsensitiveASCII(param.back(), "client")) {

103 fake_vcd_ownership_ =

104 FakeVideoCaptureDevice::BufferOwnership::CLIENT_BUFFERS;

105 } else if (base::EqualsCaseInsensitiveASCII(param.front(), "fps")) {

106 double fps = 0;

107 if (base::StringToDouble(param.back(), &fps)) {

108 frame_rate_ =

109 std::max(kFakeCaptureMinFrameRate, static_cast<float>(fps));

110 frame_rate_ = std::min(kFakeCaptureMaxFrameRate, frame_rate_);

111 }

112 }

113 }

114 }

115

116 } // namespace media

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