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
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
content / browser / renderer_host / media / audio_output_authorization_handler.cc [blame]
// Copyright 2016 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "content/browser/renderer_host/media/audio_output_authorization_handler.h"
#include "base/functional/bind.h"
#include "base/metrics/histogram_macros.h"
#include "base/task/bind_post_task.h"
#include "base/trace_event/trace_event.h"
#include "content/browser/media/media_devices_permission_checker.h"
#include "content/browser/media/media_devices_util.h"
#include "content/browser/renderer_host/media/audio_input_device_manager.h"
#include "content/public/browser/browser_task_traits.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/media_device_id.h"
#include "content/public/browser/render_frame_host.h"
#include "media/audio/audio_system.h"
using blink::mojom::MediaDeviceType;
namespace content {
namespace {
void GotSaltAndOrigin(
int render_process_id,
int render_frame_id,
bool override_permissions,
bool permissions_override_value,
base::OnceCallback<void(MediaDeviceSaltAndOrigin, bool)> cb,
const MediaDeviceSaltAndOrigin& salt_and_origin) {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
if (!MediaStreamManager::IsOriginAllowed(render_process_id,
salt_and_origin.origin())) {
// In this case, it's likely a navigation has occurred while processing this
// request.
std::move(cb).Run(MediaDeviceSaltAndOrigin::Empty(), false);
return;
}
// Check that MediaStream device permissions have been granted for
// nondefault devices.
if (override_permissions) {
std::move(cb).Run(salt_and_origin, permissions_override_value);
return;
}
std::move(cb).Run(salt_and_origin,
MediaDevicesPermissionChecker().CheckPermissionOnUIThread(
MediaDeviceType::kMediaAudioOutput, render_process_id,
render_frame_id));
}
// Returns (by callback) the MediaDeviceSaltAndOrigin for the frame and
// whether it may request nondefault audio devices.
void CheckAccessOnUIThread(
int render_process_id,
int render_frame_id,
bool override_permissions,
bool permissions_override_value,
base::OnceCallback<void(MediaDeviceSaltAndOrigin, bool)> cb) {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
GetMediaDeviceSaltAndOrigin(
GlobalRenderFrameHostId(render_process_id, render_frame_id),
base::BindOnce(&GotSaltAndOrigin, render_process_id, render_frame_id,
override_permissions, permissions_override_value,
std::move(cb)));
}
} // namespace
class AudioOutputAuthorizationHandler::TraceScope {
public:
explicit TraceScope(const std::string& device_id) {
TRACE_EVENT_NESTABLE_ASYNC_BEGIN0(
"audio", "Audio output device authorization", this);
TRACE_EVENT_NESTABLE_ASYNC_BEGIN1("audio", "Request for device", this,
"device id", device_id);
}
TraceScope(const TraceScope&) = delete;
TraceScope& operator=(const TraceScope&) = delete;
~TraceScope() {
if (waiting_for_params_) {
TRACE_EVENT_NESTABLE_ASYNC_END1("audio", "Getting audio parameters", this,
"cancelled", true);
}
if (checking_access_) {
TRACE_EVENT_NESTABLE_ASYNC_END1("audio", "Checking access", this,
"cancelled", true);
}
TRACE_EVENT_NESTABLE_ASYNC_END0("audio", "Request for device", this);
TRACE_EVENT_NESTABLE_ASYNC_END0("audio",
"Audio output device authorization", this);
}
void SimpleEvent(const char* event) {
TRACE_EVENT_NESTABLE_ASYNC_INSTANT0("audio", event, this);
}
void UsingSessionId(const base::UnguessableToken& session_id,
const std::string& device_id) {
TRACE_EVENT_NESTABLE_ASYNC_INSTANT2("audio", "Using session id", this,
"session id", session_id.ToString(),
"device id", device_id);
}
void CheckAccessStart(const std::string& device_id) {
checking_access_ = true;
TRACE_EVENT_NESTABLE_ASYNC_BEGIN1("audio", "Checking access", this,
"device id", device_id);
}
void AccessChecked(bool has_access) {
checking_access_ = false;
TRACE_EVENT_NESTABLE_ASYNC_END1("audio", "Checking access", this,
"access granted", has_access);
}
void StartedGettingAudioParameters(const std::string& raw_device_id) {
waiting_for_params_ = true;
TRACE_EVENT_NESTABLE_ASYNC_BEGIN1("audio", "Getting audio parameters", this,
"device id", raw_device_id);
}
void FinishedGettingAudioParameters() {
waiting_for_params_ = false;
TRACE_EVENT_NESTABLE_ASYNC_END0("audio", "Getting audio parameters", this);
}
private:
bool checking_access_ = false;
bool waiting_for_params_ = false;
};
AudioOutputAuthorizationHandler::AudioOutputAuthorizationHandler(
media::AudioSystem* audio_system,
MediaStreamManager* media_stream_manager,
int render_process_id)
: audio_system_(audio_system),
media_stream_manager_(media_stream_manager),
render_process_id_(render_process_id) {
DCHECK(media_stream_manager_);
}
AudioOutputAuthorizationHandler::~AudioOutputAuthorizationHandler() {
// |weak_factory| is not thread safe. Make sure it's destructed on the
// right thread.
DCHECK_CURRENTLY_ON(BrowserThread::IO);
}
void AudioOutputAuthorizationHandler::RequestDeviceAuthorization(
int render_frame_id,
const base::UnguessableToken& session_id,
const std::string& device_id,
AuthorizationCompletedCallback cb) const {
DCHECK_CURRENTLY_ON(BrowserThread::IO);
auto trace_scope = std::make_unique<TraceScope>(device_id);
if (!IsValidDeviceId(device_id)) {
trace_scope->SimpleEvent("Invalid device id");
std::move(cb).Run(media::OUTPUT_DEVICE_STATUS_ERROR_NOT_FOUND,
media::AudioParameters::UnavailableDeviceParams(),
std::string(), std::string());
return;
}
// If |session_id| should be used for output device selection and such an
// output device is found, reuse the input device permissions.
if (media::AudioDeviceDescription::UseSessionIdToSelectDevice(session_id,
device_id)) {
const blink::MediaStreamDevice* device =
media_stream_manager_->audio_input_device_manager()
->GetOpenedDeviceById(session_id);
if (device && device->matched_output_device_id) {
trace_scope->UsingSessionId(session_id, device->id);
// We don't need the origin for authorization in this case, but it's used
// for hashing the device id before sending it back to the renderer.
GetUIThreadTaskRunner({})->PostTask(
FROM_HERE,
base::BindOnce(
&GetMediaDeviceSaltAndOrigin,
GlobalRenderFrameHostId(render_process_id_, render_frame_id),
base::BindPostTaskToCurrentDefault(base::BindOnce(
&AudioOutputAuthorizationHandler::HashDeviceId,
weak_factory_.GetWeakPtr(), std::move(trace_scope),
std::move(cb), *device->matched_output_device_id))));
return;
}
// Otherwise, the default device is used.
}
if (media::AudioDeviceDescription::IsDefaultDevice(device_id)) {
// The default device doesn't need authorization.
GetDeviceParameters(std::move(trace_scope), std::move(cb),
media::AudioDeviceDescription::kDefaultDeviceId);
return;
}
trace_scope->CheckAccessStart(device_id);
// Check device permissions if nondefault device is requested.
GetUIThreadTaskRunner({})->PostTask(
FROM_HERE,
base::BindOnce(&CheckAccessOnUIThread, render_process_id_,
render_frame_id, override_permissions_,
permissions_override_value_,
base::BindPostTaskToCurrentDefault(base::BindOnce(
&AudioOutputAuthorizationHandler::AccessChecked,
weak_factory_.GetWeakPtr(), std::move(trace_scope),
std::move(cb), device_id))));
}
void AudioOutputAuthorizationHandler::OverridePermissionsForTesting(
bool override_value) {
DCHECK_CURRENTLY_ON(BrowserThread::IO);
override_permissions_ = true;
permissions_override_value_ = override_value;
}
void AudioOutputAuthorizationHandler::
SetAuthorizedDeviceIdForGlobalMediaControls(std::string hashed_device_id) {
hashed_device_id_for_global_media_controls_ = std::move(hashed_device_id);
}
void AudioOutputAuthorizationHandler::UMALogDeviceAuthorizationTime(
base::TimeTicks auth_start_time) {
UMA_HISTOGRAM_CUSTOM_TIMES("Media.Audio.OutputDeviceAuthorizationTime",
base::TimeTicks::Now() - auth_start_time,
base::Milliseconds(1), base::Milliseconds(5000),
50);
}
void AudioOutputAuthorizationHandler::HashDeviceId(
std::unique_ptr<TraceScope> trace_scope,
AuthorizationCompletedCallback cb,
const std::string& raw_device_id,
const MediaDeviceSaltAndOrigin& salt_and_origin) const {
DCHECK_CURRENTLY_ON(BrowserThread::IO);
DCHECK(!raw_device_id.empty());
std::string hashed_device_id =
GetHMACForRawMediaDeviceID(salt_and_origin, raw_device_id);
trace_scope->StartedGettingAudioParameters(raw_device_id);
audio_system_->GetOutputStreamParameters(
raw_device_id,
base::BindOnce(&AudioOutputAuthorizationHandler::DeviceParametersReceived,
weak_factory_.GetWeakPtr(), std::move(trace_scope),
std::move(cb), hashed_device_id, raw_device_id));
}
void AudioOutputAuthorizationHandler::AccessChecked(
std::unique_ptr<TraceScope> trace_scope,
AuthorizationCompletedCallback cb,
const std::string& device_id,
MediaDeviceSaltAndOrigin salt_and_origin,
bool has_access) const {
DCHECK_CURRENTLY_ON(BrowserThread::IO);
trace_scope->AccessChecked(has_access);
// If this device has been explicitly allowed by the browser, overwrite the
// result of the permission check.
has_access = device_id == hashed_device_id_for_global_media_controls_
? true
: has_access;
if (!has_access) {
std::move(cb).Run(media::OUTPUT_DEVICE_STATUS_ERROR_NOT_AUTHORIZED,
media::AudioParameters::UnavailableDeviceParams(),
std::string(), std::string());
return;
}
MediaDevicesManager::BoolDeviceTypes devices_to_enumerate;
devices_to_enumerate[static_cast<size_t>(MediaDeviceType::kMediaAudioOutput)] =
true;
media_stream_manager_->media_devices_manager()->EnumerateDevices(
devices_to_enumerate,
base::BindOnce(&AudioOutputAuthorizationHandler::TranslateDeviceID,
weak_factory_.GetWeakPtr(), std::move(trace_scope),
std::move(cb), device_id, std::move(salt_and_origin)));
}
void AudioOutputAuthorizationHandler::TranslateDeviceID(
std::unique_ptr<TraceScope> trace_scope,
AuthorizationCompletedCallback cb,
const std::string& device_id,
const MediaDeviceSaltAndOrigin& salt_and_origin,
const MediaDeviceEnumeration& enumeration) const {
DCHECK_CURRENTLY_ON(BrowserThread::IO);
DCHECK(!media::AudioDeviceDescription::IsDefaultDevice(device_id));
for (const blink::WebMediaDeviceInfo& device_info :
enumeration[static_cast<size_t>(MediaDeviceType::kMediaAudioOutput)]) {
if (DoesRawMediaDeviceIDMatchHMAC(salt_and_origin, device_id,
device_info.device_id)) {
GetDeviceParameters(std::move(trace_scope), std::move(cb),
device_info.device_id);
return;
}
}
trace_scope->SimpleEvent("Found no device matching device id");
std::move(cb).Run(media::OUTPUT_DEVICE_STATUS_ERROR_NOT_FOUND,
media::AudioParameters::UnavailableDeviceParams(),
std::string(), std::string());
}
void AudioOutputAuthorizationHandler::GetDeviceParameters(
std::unique_ptr<TraceScope> trace_scope,
AuthorizationCompletedCallback cb,
const std::string& raw_device_id) const {
DCHECK_CURRENTLY_ON(BrowserThread::IO);
DCHECK(!raw_device_id.empty());
trace_scope->StartedGettingAudioParameters(raw_device_id);
audio_system_->GetOutputStreamParameters(
raw_device_id,
base::BindOnce(&AudioOutputAuthorizationHandler::DeviceParametersReceived,
weak_factory_.GetWeakPtr(), std::move(trace_scope),
std::move(cb), std::string(), raw_device_id));
}
void AudioOutputAuthorizationHandler::DeviceParametersReceived(
std::unique_ptr<TraceScope> trace_scope,
AuthorizationCompletedCallback cb,
const std::string& id_for_renderer,
const std::string& raw_device_id,
const std::optional<media::AudioParameters>& params) const {
DCHECK_CURRENTLY_ON(BrowserThread::IO);
DCHECK(!raw_device_id.empty());
DCHECK(!params || params->IsValid());
trace_scope->FinishedGettingAudioParameters();
std::move(cb).Run(
media::OUTPUT_DEVICE_STATUS_OK,
params.value_or(media::AudioParameters::UnavailableDeviceParams()),
raw_device_id, id_for_renderer);
}
} // namespace content