1/*
2 * libjingle
3 * Copyright 2013 Google Inc.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 *
8 *  1. Redistributions of source code must retain the above copyright notice,
9 *     this list of conditions and the following disclaimer.
10 *  2. Redistributions in binary form must reproduce the above copyright notice,
11 *     this list of conditions and the following disclaimer in the documentation
12 *     and/or other materials provided with the distribution.
13 *  3. The name of the author may not be used to endorse or promote products
14 *     derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
17 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
18 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
19 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
20 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
22 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
23 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
24 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
25 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28#include "talk/app/webrtc/localaudiosource.h"
29
30#include <vector>
31
32#include "talk/app/webrtc/mediaconstraintsinterface.h"
33#include "talk/media/base/mediaengine.h"
34
35using webrtc::MediaConstraintsInterface;
36using webrtc::MediaSourceInterface;
37
38namespace webrtc {
39
40namespace {
41
42// Convert constraints to audio options. Return false if constraints are
43// invalid.
44void FromConstraints(const MediaConstraintsInterface::Constraints& constraints,
45                     cricket::AudioOptions* options) {
46  // This design relies on the fact that all the audio constraints are actually
47  // "options", i.e. boolean-valued and always satisfiable.  If the constraints
48  // are extended to include non-boolean values or actual format constraints,
49  // a different algorithm will be required.
50  struct {
51    const char* name;
52    rtc::Optional<bool>& value;
53  } key_to_value[] = {
54      {MediaConstraintsInterface::kGoogEchoCancellation,
55       options->echo_cancellation},
56      {MediaConstraintsInterface::kExtendedFilterEchoCancellation,
57       options->extended_filter_aec},
58      {MediaConstraintsInterface::kDAEchoCancellation,
59       options->delay_agnostic_aec},
60      {MediaConstraintsInterface::kAutoGainControl, options->auto_gain_control},
61      {MediaConstraintsInterface::kExperimentalAutoGainControl,
62       options->experimental_agc},
63      {MediaConstraintsInterface::kNoiseSuppression,
64       options->noise_suppression},
65      {MediaConstraintsInterface::kExperimentalNoiseSuppression,
66       options->experimental_ns},
67      {MediaConstraintsInterface::kHighpassFilter, options->highpass_filter},
68      {MediaConstraintsInterface::kTypingNoiseDetection,
69       options->typing_detection},
70      {MediaConstraintsInterface::kAudioMirroring, options->stereo_swapping},
71      {MediaConstraintsInterface::kAecDump, options->aec_dump}
72  };
73
74  for (const auto& constraint : constraints) {
75    bool value = false;
76    if (!rtc::FromString(constraint.value, &value))
77      continue;
78
79    for (auto& entry : key_to_value) {
80      if (constraint.key.compare(entry.name) == 0)
81        entry.value = rtc::Optional<bool>(value);
82    }
83  }
84}
85
86}  // namespace
87
88rtc::scoped_refptr<LocalAudioSource> LocalAudioSource::Create(
89    const PeerConnectionFactoryInterface::Options& options,
90    const MediaConstraintsInterface* constraints) {
91  rtc::scoped_refptr<LocalAudioSource> source(
92      new rtc::RefCountedObject<LocalAudioSource>());
93  source->Initialize(options, constraints);
94  return source;
95}
96
97void LocalAudioSource::Initialize(
98    const PeerConnectionFactoryInterface::Options& options,
99    const MediaConstraintsInterface* constraints) {
100  if (!constraints)
101    return;
102
103  // Apply optional constraints first, they will be overwritten by mandatory
104  // constraints.
105  FromConstraints(constraints->GetOptional(), &options_);
106
107  cricket::AudioOptions mandatory_options;
108  FromConstraints(constraints->GetMandatory(), &mandatory_options);
109  options_.SetAll(mandatory_options);
110  source_state_ = kLive;
111}
112
113}  // namespace webrtc
114