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* Copyright 2013 The WebRTC project authors. All Rights Reserved.
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
// This file contains the interface for MediaConstraints, corresponding to
// the definition at
// and also
// used in WebRTC:
// This interface is being deprecated in Chrome, and may be removed
// from WebRTC too.
#include <string>
#include <vector>
#include "webrtc/base/optional.h"
#include "webrtc/api/peerconnectioninterface.h"
namespace webrtc {
// MediaConstraintsInterface
// Interface used for passing arguments about media constraints
// to the MediaStream and PeerConnection implementation.
class MediaConstraintsInterface {
struct Constraint {
Constraint() {}
Constraint(const std::string& key, const std::string value)
: key(key), value(value) {
std::string key;
std::string value;
class Constraints : public std::vector<Constraint> {
bool FindFirst(const std::string& key, std::string* value) const;
virtual const Constraints& GetMandatory() const = 0;
virtual const Constraints& GetOptional() const = 0;
// Constraint keys used by a local video source.
// Specified by draft-alvestrand-constraints-resolution-00b
static const char kMinAspectRatio[]; // minAspectRatio
static const char kMaxAspectRatio[]; // maxAspectRatio
static const char kMaxWidth[]; // maxWidth
static const char kMinWidth[]; // minWidth
static const char kMaxHeight[]; // maxHeight
static const char kMinHeight[]; // minHeight
static const char kMaxFrameRate[]; // maxFrameRate
static const char kMinFrameRate[]; // minFrameRate
// Constraint keys used by a local audio source.
static const char kEchoCancellation[]; // echoCancellation
// These keys are google specific.
static const char kGoogEchoCancellation[]; // googEchoCancellation
static const char kExtendedFilterEchoCancellation[]; // googEchoCancellation2
static const char kDAEchoCancellation[]; // googDAEchoCancellation
static const char kAutoGainControl[]; // googAutoGainControl
static const char kExperimentalAutoGainControl[]; // googAutoGainControl2
static const char kNoiseSuppression[]; // googNoiseSuppression
static const char kExperimentalNoiseSuppression[]; // googNoiseSuppression2
static const char kIntelligibilityEnhancer[]; // intelligibilityEnhancer
static const char kLevelControl[]; // levelControl
static const char kHighpassFilter[]; // googHighpassFilter
static const char kTypingNoiseDetection[]; // googTypingNoiseDetection
static const char kAudioMirroring[]; // googAudioMirroring
// Google-specific constraint keys for a local video source
static const char kNoiseReduction[]; // googNoiseReduction
// Constraint keys for CreateOffer / CreateAnswer
// Specified by the W3C PeerConnection spec
static const char kOfferToReceiveVideo[]; // OfferToReceiveVideo
static const char kOfferToReceiveAudio[]; // OfferToReceiveAudio
static const char kVoiceActivityDetection[]; // VoiceActivityDetection
static const char kIceRestart[]; // IceRestart
// These keys are google specific.
static const char kUseRtpMux[]; // googUseRtpMUX
// Constraints values.
static const char kValueTrue[]; // true
static const char kValueFalse[]; // false
// PeerConnection constraint keys.
// Temporary pseudo-constraints used to enable DTLS-SRTP
static const char kEnableDtlsSrtp[]; // Enable DTLS-SRTP
// Temporary pseudo-constraints used to enable DataChannels
static const char kEnableRtpDataChannels[]; // Enable RTP DataChannels
// Google-specific constraint keys.
// Temporary pseudo-constraint for enabling DSCP through JS.
static const char kEnableDscp[]; // googDscp
// Constraint to enable IPv6 through JS.
static const char kEnableIPv6[]; // googIPv6
// Temporary constraint to enable suspend below min bitrate feature.
static const char kEnableVideoSuspendBelowMinBitrate[];
// googSuspendBelowMinBitrate
// Constraint to enable combined audio+video bandwidth estimation.
static const char kCombinedAudioVideoBwe[]; // googCombinedAudioVideoBwe
static const char kScreencastMinBitrate[]; // googScreencastMinBitrate
static const char kCpuOveruseDetection[]; // googCpuOveruseDetection
static const char kPayloadPadding[]; // googPayloadPadding
// The prefix of internal-only constraints whose JS set values should be
// stripped by Chrome before passed down to Libjingle.
static const char kInternalConstraintPrefix[];
// Dtor protected as objects shouldn't be deleted via this interface
virtual ~MediaConstraintsInterface() {}
bool FindConstraint(const MediaConstraintsInterface* constraints,
const std::string& key, bool* value,
size_t* mandatory_constraints);
bool FindConstraint(const MediaConstraintsInterface* constraints,
const std::string& key,
int* value,
size_t* mandatory_constraints);
// Copy all relevant constraints into an RTCConfiguration object.
void CopyConstraintsIntoRtcConfiguration(
const MediaConstraintsInterface* constraints,
PeerConnectionInterface::RTCConfiguration* configuration);
} // namespace webrtc