276 lines
11 KiB
C++
276 lines
11 KiB
C++
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/*
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* Copyright 2013 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "sdk/media_constraints.h"
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#include "absl/types/optional.h"
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#include "api/peer_connection_interface.h"
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namespace webrtc {
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namespace {
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// Find the highest-priority instance of the T-valued constraint named by
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// |key| and return its value as |value|. |constraints| can be null.
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// If |mandatory_constraints| is non-null, it is incremented if the key appears
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// among the mandatory constraints.
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// Returns true if the key was found and has a valid value for type T.
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// If the key appears multiple times as an optional constraint, appearances
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// after the first are ignored.
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// Note: Because this uses FindFirst, repeated optional constraints whose
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// first instance has an unrecognized value are not handled precisely in
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// accordance with the specification.
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template <typename T>
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bool FindConstraint(const MediaConstraints* constraints,
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const std::string& key,
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T* value,
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size_t* mandatory_constraints) {
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std::string string_value;
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if (!FindConstraint(constraints, key, &string_value, mandatory_constraints)) {
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return false;
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}
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return rtc::FromString(string_value, value);
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}
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// Specialization for std::string, since a string doesn't need conversion.
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template <>
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bool FindConstraint(const MediaConstraints* constraints,
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const std::string& key,
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std::string* value,
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size_t* mandatory_constraints) {
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if (!constraints) {
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return false;
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}
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if (constraints->GetMandatory().FindFirst(key, value)) {
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if (mandatory_constraints) {
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++*mandatory_constraints;
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}
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return true;
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}
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if (constraints->GetOptional().FindFirst(key, value)) {
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return true;
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}
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return false;
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}
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bool FindConstraint(const MediaConstraints* constraints,
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const std::string& key,
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bool* value,
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size_t* mandatory_constraints) {
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return FindConstraint<bool>(constraints, key, value, mandatory_constraints);
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}
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bool FindConstraint(const MediaConstraints* constraints,
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const std::string& key,
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int* value,
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size_t* mandatory_constraints) {
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return FindConstraint<int>(constraints, key, value, mandatory_constraints);
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}
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// Converts a constraint (mandatory takes precedence over optional) to an
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// absl::optional.
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template <typename T>
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void ConstraintToOptional(const MediaConstraints* constraints,
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const std::string& key,
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absl::optional<T>* value_out) {
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T value;
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bool present = FindConstraint<T>(constraints, key, &value, nullptr);
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if (present) {
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*value_out = value;
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}
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}
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} // namespace
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const char MediaConstraints::kValueTrue[] = "true";
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const char MediaConstraints::kValueFalse[] = "false";
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// Constraints declared as static members in mediastreaminterface.h
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// Audio constraints.
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const char MediaConstraints::kGoogEchoCancellation[] = "googEchoCancellation";
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const char MediaConstraints::kAutoGainControl[] = "googAutoGainControl";
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const char MediaConstraints::kExperimentalAutoGainControl[] =
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"googAutoGainControl2";
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const char MediaConstraints::kNoiseSuppression[] = "googNoiseSuppression";
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const char MediaConstraints::kExperimentalNoiseSuppression[] =
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"googNoiseSuppression2";
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const char MediaConstraints::kHighpassFilter[] = "googHighpassFilter";
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const char MediaConstraints::kTypingNoiseDetection[] =
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"googTypingNoiseDetection";
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const char MediaConstraints::kAudioMirroring[] = "googAudioMirroring";
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const char MediaConstraints::kAudioNetworkAdaptorConfig[] =
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"googAudioNetworkAdaptorConfig";
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// Constraint keys for CreateOffer / CreateAnswer defined in W3C specification.
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const char MediaConstraints::kOfferToReceiveAudio[] = "OfferToReceiveAudio";
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const char MediaConstraints::kOfferToReceiveVideo[] = "OfferToReceiveVideo";
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const char MediaConstraints::kVoiceActivityDetection[] =
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"VoiceActivityDetection";
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const char MediaConstraints::kIceRestart[] = "IceRestart";
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// Google specific constraint for BUNDLE enable/disable.
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const char MediaConstraints::kUseRtpMux[] = "googUseRtpMUX";
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// Below constraints should be used during PeerConnection construction.
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const char MediaConstraints::kEnableDtlsSrtp[] = "DtlsSrtpKeyAgreement";
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const char MediaConstraints::kEnableRtpDataChannels[] = "RtpDataChannels";
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// Google-specific constraint keys.
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const char MediaConstraints::kEnableDscp[] = "googDscp";
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const char MediaConstraints::kEnableIPv6[] = "googIPv6";
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const char MediaConstraints::kEnableVideoSuspendBelowMinBitrate[] =
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"googSuspendBelowMinBitrate";
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const char MediaConstraints::kCombinedAudioVideoBwe[] =
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"googCombinedAudioVideoBwe";
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const char MediaConstraints::kScreencastMinBitrate[] =
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"googScreencastMinBitrate";
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// TODO(ronghuawu): Remove once cpu overuse detection is stable.
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const char MediaConstraints::kCpuOveruseDetection[] = "googCpuOveruseDetection";
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const char MediaConstraints::kRawPacketizationForVideoEnabled[] =
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"googRawPacketizationForVideoEnabled";
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const char MediaConstraints::kNumSimulcastLayers[] = "googNumSimulcastLayers";
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// Set |value| to the value associated with the first appearance of |key|, or
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// return false if |key| is not found.
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bool MediaConstraints::Constraints::FindFirst(const std::string& key,
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std::string* value) const {
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for (Constraints::const_iterator iter = begin(); iter != end(); ++iter) {
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if (iter->key == key) {
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*value = iter->value;
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return true;
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}
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}
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return false;
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}
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void CopyConstraintsIntoRtcConfiguration(
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const MediaConstraints* constraints,
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PeerConnectionInterface::RTCConfiguration* configuration) {
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// Copy info from constraints into configuration, if present.
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if (!constraints) {
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return;
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}
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bool enable_ipv6;
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if (FindConstraint(constraints, MediaConstraints::kEnableIPv6, &enable_ipv6,
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nullptr)) {
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configuration->disable_ipv6 = !enable_ipv6;
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}
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FindConstraint(constraints, MediaConstraints::kEnableDscp,
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&configuration->media_config.enable_dscp, nullptr);
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FindConstraint(constraints, MediaConstraints::kCpuOveruseDetection,
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&configuration->media_config.video.enable_cpu_adaptation,
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nullptr);
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FindConstraint(constraints, MediaConstraints::kEnableRtpDataChannels,
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&configuration->enable_rtp_data_channel, nullptr);
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// Find Suspend Below Min Bitrate constraint.
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FindConstraint(
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constraints, MediaConstraints::kEnableVideoSuspendBelowMinBitrate,
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&configuration->media_config.video.suspend_below_min_bitrate, nullptr);
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ConstraintToOptional<int>(constraints,
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MediaConstraints::kScreencastMinBitrate,
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&configuration->screencast_min_bitrate);
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ConstraintToOptional<bool>(constraints,
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MediaConstraints::kCombinedAudioVideoBwe,
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&configuration->combined_audio_video_bwe);
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ConstraintToOptional<bool>(constraints, MediaConstraints::kEnableDtlsSrtp,
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&configuration->enable_dtls_srtp);
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}
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void CopyConstraintsIntoAudioOptions(const MediaConstraints* constraints,
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cricket::AudioOptions* options) {
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if (!constraints) {
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return;
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}
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ConstraintToOptional<bool>(constraints,
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MediaConstraints::kGoogEchoCancellation,
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&options->echo_cancellation);
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ConstraintToOptional<bool>(constraints, MediaConstraints::kAutoGainControl,
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&options->auto_gain_control);
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ConstraintToOptional<bool>(constraints,
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MediaConstraints::kExperimentalAutoGainControl,
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&options->experimental_agc);
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ConstraintToOptional<bool>(constraints, MediaConstraints::kNoiseSuppression,
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&options->noise_suppression);
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ConstraintToOptional<bool>(constraints,
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MediaConstraints::kExperimentalNoiseSuppression,
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&options->experimental_ns);
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ConstraintToOptional<bool>(constraints, MediaConstraints::kHighpassFilter,
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&options->highpass_filter);
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ConstraintToOptional<bool>(constraints,
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MediaConstraints::kTypingNoiseDetection,
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&options->typing_detection);
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ConstraintToOptional<bool>(constraints, MediaConstraints::kAudioMirroring,
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&options->stereo_swapping);
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ConstraintToOptional<std::string>(
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constraints, MediaConstraints::kAudioNetworkAdaptorConfig,
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&options->audio_network_adaptor_config);
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// When |kAudioNetworkAdaptorConfig| is defined, it both means that audio
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// network adaptor is desired, and provides the config string.
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if (options->audio_network_adaptor_config) {
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options->audio_network_adaptor = true;
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}
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}
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bool CopyConstraintsIntoOfferAnswerOptions(
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const MediaConstraints* constraints,
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PeerConnectionInterface::RTCOfferAnswerOptions* offer_answer_options) {
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if (!constraints) {
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return true;
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}
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bool value = false;
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size_t mandatory_constraints_satisfied = 0;
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if (FindConstraint(constraints, MediaConstraints::kOfferToReceiveAudio,
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&value, &mandatory_constraints_satisfied)) {
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offer_answer_options->offer_to_receive_audio =
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value ? PeerConnectionInterface::RTCOfferAnswerOptions::
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kOfferToReceiveMediaTrue
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: 0;
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}
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if (FindConstraint(constraints, MediaConstraints::kOfferToReceiveVideo,
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&value, &mandatory_constraints_satisfied)) {
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offer_answer_options->offer_to_receive_video =
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value ? PeerConnectionInterface::RTCOfferAnswerOptions::
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kOfferToReceiveMediaTrue
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: 0;
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}
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if (FindConstraint(constraints, MediaConstraints::kVoiceActivityDetection,
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&value, &mandatory_constraints_satisfied)) {
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offer_answer_options->voice_activity_detection = value;
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}
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if (FindConstraint(constraints, MediaConstraints::kUseRtpMux, &value,
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&mandatory_constraints_satisfied)) {
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offer_answer_options->use_rtp_mux = value;
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}
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if (FindConstraint(constraints, MediaConstraints::kIceRestart, &value,
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&mandatory_constraints_satisfied)) {
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offer_answer_options->ice_restart = value;
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}
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if (FindConstraint(constraints,
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MediaConstraints::kRawPacketizationForVideoEnabled, &value,
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&mandatory_constraints_satisfied)) {
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offer_answer_options->raw_packetization_for_video = value;
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}
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int layers;
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if (FindConstraint(constraints, MediaConstraints::kNumSimulcastLayers,
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&layers, &mandatory_constraints_satisfied)) {
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offer_answer_options->num_simulcast_layers = layers;
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}
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return mandatory_constraints_satisfied == constraints->GetMandatory().size();
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}
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} // namespace webrtc
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