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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/media/base/mediaengine.h"
     33 #include "talk/app/webrtc/mediaconstraintsinterface.h"
     34 
     35 using webrtc::MediaConstraintsInterface;
     36 using webrtc::MediaSourceInterface;
     37 
     38 namespace webrtc {
     39 
     40 // Constraint keys.
     41 // They are declared as static members in mediaconstraintsinterface.h
     42 const char MediaConstraintsInterface::kEchoCancellation[] =
     43     "googEchoCancellation";
     44 const char MediaConstraintsInterface::kExperimentalEchoCancellation[] =
     45     "googEchoCancellation2";
     46 const char MediaConstraintsInterface::kAutoGainControl[] =
     47     "googAutoGainControl";
     48 const char MediaConstraintsInterface::kExperimentalAutoGainControl[] =
     49     "googAutoGainControl2";
     50 const char MediaConstraintsInterface::kNoiseSuppression[] =
     51     "googNoiseSuppression";
     52 const char MediaConstraintsInterface::kHighpassFilter[] =
     53     "googHighpassFilter";
     54 const char MediaConstraintsInterface::kInternalAecDump[] = "internalAecDump";
     55 
     56 namespace {
     57 
     58 // Convert constraints to audio options. Return false if constraints are
     59 // invalid.
     60 bool FromConstraints(const MediaConstraintsInterface::Constraints& constraints,
     61                      cricket::AudioOptions* options) {
     62   bool success = true;
     63   MediaConstraintsInterface::Constraints::const_iterator iter;
     64 
     65   // This design relies on the fact that all the audio constraints are actually
     66   // "options", i.e. boolean-valued and always satisfiable.  If the constraints
     67   // are extended to include non-boolean values or actual format constraints,
     68   // a different algorithm will be required.
     69   for (iter = constraints.begin(); iter != constraints.end(); ++iter) {
     70     bool value = false;
     71 
     72     if (!talk_base::FromString(iter->value, &value)) {
     73       success = false;
     74       continue;
     75     }
     76 
     77     if (iter->key == MediaConstraintsInterface::kEchoCancellation)
     78       options->echo_cancellation.Set(value);
     79     else if (iter->key ==
     80         MediaConstraintsInterface::kExperimentalEchoCancellation)
     81       options->experimental_aec.Set(value);
     82     else if (iter->key == MediaConstraintsInterface::kAutoGainControl)
     83       options->auto_gain_control.Set(value);
     84     else if (iter->key ==
     85         MediaConstraintsInterface::kExperimentalAutoGainControl)
     86       options->experimental_agc.Set(value);
     87     else if (iter->key == MediaConstraintsInterface::kNoiseSuppression)
     88       options->noise_suppression.Set(value);
     89     else if (iter->key == MediaConstraintsInterface::kHighpassFilter)
     90       options->highpass_filter.Set(value);
     91     else if (iter->key == MediaConstraintsInterface::kInternalAecDump)
     92       options->aec_dump.Set(value);
     93     else
     94       success = false;
     95   }
     96   return success;
     97 }
     98 
     99 }  // namespace
    100 
    101 talk_base::scoped_refptr<LocalAudioSource> LocalAudioSource::Create(
    102     const MediaConstraintsInterface* constraints) {
    103   talk_base::scoped_refptr<LocalAudioSource> source(
    104       new talk_base::RefCountedObject<LocalAudioSource>());
    105   source->Initialize(constraints);
    106   return source;
    107 }
    108 
    109 void LocalAudioSource::Initialize(
    110     const MediaConstraintsInterface* constraints) {
    111   if (!constraints)
    112     return;
    113 
    114   // Apply optional constraints first, they will be overwritten by mandatory
    115   // constraints.
    116   FromConstraints(constraints->GetOptional(), &options_);
    117 
    118   cricket::AudioOptions options;
    119   if (!FromConstraints(constraints->GetMandatory(), &options)) {
    120     source_state_ = kEnded;
    121     return;
    122   }
    123   options_.SetAll(options);
    124   source_state_ = kLive;
    125 }
    126 
    127 }  // namespace webrtc
    128