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      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 
     35 using webrtc::MediaConstraintsInterface;
     36 using webrtc::MediaSourceInterface;
     37 
     38 namespace webrtc {
     39 
     40 namespace {
     41 
     42 // Convert constraints to audio options. Return false if constraints are
     43 // invalid.
     44 void 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 
     88 rtc::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 
     97 void 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