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/*
* libjingle
* Copyright 2013, Google Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "talk/app/webrtc/mediaconstraintsinterface.h"
#include "talk/base/stringencode.h"
namespace webrtc {
const char MediaConstraintsInterface::kValueTrue[] = "true";
const char MediaConstraintsInterface::kValueFalse[] = "false";
// Set |value| to the value associated with the first appearance of |key|, or
// return false if |key| is not found.
bool MediaConstraintsInterface::Constraints::FindFirst(
const std::string& key, std::string* value) const {
for (Constraints::const_iterator iter = begin(); iter != end(); ++iter) {
if (iter->key == key) {
*value = iter->value;
return true;
}
}
return false;
}
// Find the highest-priority instance of the boolean-valued constraint) named by
// |key| and return its value as |value|. |constraints| can be null.
// If |mandatory_constraints| is non-null, it is incremented if the key appears
// among the mandatory constraints.
// Returns true if the key was found and has a valid boolean value.
// If the key appears multiple times as an optional constraint, appearances
// after the first are ignored.
// Note: Because this uses FindFirst, repeated optional constraints whose
// first instance has an unrecognized value are not handled precisely in
// accordance with the specification.
bool FindConstraint(const MediaConstraintsInterface* constraints,
const std::string& key, bool* value,
size_t* mandatory_constraints) {
std::string string_value;
if (!constraints) {
return false;
}
if (constraints->GetMandatory().FindFirst(key, &string_value)) {
if (mandatory_constraints)
++*mandatory_constraints;
return talk_base::FromString(string_value, value);
}
if (constraints->GetOptional().FindFirst(key, &string_value)) {
return talk_base::FromString(string_value, value);
}
return false;
}
} // namespace webrtc
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