| /* |
| * Copyright 2015 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. |
| */ |
| |
| #ifndef WEBRTC_API_RTPPARAMETERS_H_ |
| #define WEBRTC_API_RTPPARAMETERS_H_ |
| |
| #include <string> |
| #include <unordered_map> |
| #include <vector> |
| |
| #include "webrtc/api/mediatypes.h" |
| #include "webrtc/base/optional.h" |
| |
| namespace webrtc { |
| |
| // These structures are intended to mirror those defined by: |
| // http://draft.ortc.org/#rtcrtpdictionaries* |
| // Contains everything specified as of 2017 Jan 24. |
| // |
| // They are used when retrieving or modifying the parameters of an |
| // RtpSender/RtpReceiver, or retrieving capabilities. |
| // |
| // Note on conventions: Where ORTC may use "octet", "short" and "unsigned" |
| // types, we typically use "int", in keeping with our style guidelines. The |
| // parameter's actual valid range will be enforced when the parameters are set, |
| // rather than when the parameters struct is built. An exception is made for |
| // SSRCs, since they use the full unsigned 32-bit range, and aren't expected to |
| // be used for any numeric comparisons/operations. |
| // |
| // Additionally, where ORTC uses strings, we may use enums for things that have |
| // a fixed number of supported values. However, for things that can be extended |
| // (such as codecs, by providing an external encoder factory), a string |
| // identifier is used. |
| |
| enum class FecMechanism { |
| RED, |
| RED_AND_ULPFEC, |
| FLEXFEC, |
| }; |
| |
| // Used in RtcpFeedback struct. |
| enum class RtcpFeedbackType { |
| ACK, |
| CCM, |
| NACK, |
| REMB, // "goog-remb" |
| TRANSPORT_CC, |
| }; |
| |
| // Used in RtcpFeedback struct when type is ACK, NACK or CCM. |
| enum class RtcpFeedbackMessageType { |
| // Equivalent to {type: "nack", parameter: undefined} in ORTC. |
| GENERIC_NACK, |
| PLI, // Usable with NACK. |
| FIR, // Usable with CCM. |
| }; |
| |
| enum class DtxStatus { |
| DISABLED, |
| ENABLED, |
| }; |
| |
| enum class DegradationPreference { |
| MAINTAIN_FRAMERATE, |
| MAINTAIN_RESOLUTION, |
| BALANCED, |
| }; |
| |
| enum class PriorityType { VERY_LOW, LOW, MEDIUM, HIGH }; |
| |
| struct RtcpFeedback { |
| RtcpFeedbackType type = RtcpFeedbackType::ACK; |
| |
| // Equivalent to ORTC "parameter" field with slight differences: |
| // 1. It's an enum instead of a string. |
| // 2. Generic NACK feedback is represented by a GENERIC_NACK message type, |
| // rather than an unset "parameter" value. |
| rtc::Optional<RtcpFeedbackMessageType> message_type; |
| |
| bool operator==(const RtcpFeedback& o) const { |
| return type == o.type && message_type == o.message_type; |
| } |
| bool operator!=(const RtcpFeedback& o) const { return !(*this == o); } |
| }; |
| |
| // RtpCodecCapability is to RtpCodecParameters as RtpCapabilities is to |
| // RtpParameters. This represents the static capabilities of an endpoint's |
| // implementation of a codec. |
| struct RtpCodecCapability { |
| // Build MIME "type/subtype" string from |name| and |kind|. |
| std::string mime_type() const { return MediaTypeToString(kind) + "/" + name; } |
| |
| // Used to identify the codec. Equivalent to MIME subtype. |
| std::string name; |
| |
| // The media type of this codec. Equivalent to MIME top-level type. |
| cricket::MediaType kind = cricket::MEDIA_TYPE_AUDIO; |
| |
| // Clock rate in Hertz. If unset, the codec is applicable to any clock rate. |
| rtc::Optional<int> clock_rate; |
| |
| // Default payload type for this codec. Mainly needed for codecs that use |
| // that have statically assigned payload types. |
| rtc::Optional<int> preferred_payload_type; |
| |
| // Maximum packetization time supported by an RtpReceiver for this codec. |
| // TODO(deadbeef): Not implemented. |
| rtc::Optional<int> max_ptime; |
| |
| // Preferred packetization time for an RtpReceiver or RtpSender of this |
| // codec. |
| // TODO(deadbeef): Not implemented. |
| rtc::Optional<int> ptime; |
| |
| // The number of audio channels supported. Unused for video codecs. |
| rtc::Optional<int> num_channels; |
| |
| // Feedback mechanisms supported for this codec. |
| std::vector<RtcpFeedback> rtcp_feedback; |
| |
| // Codec-specific parameters that must be signaled to the remote party. |
| // Corresponds to "a=fmtp" parameters in SDP. |
| std::unordered_map<std::string, std::string> parameters; |
| |
| // Codec-specific parameters that may optionally be signaled to the remote |
| // party. |
| // TODO(deadbeef): Not implemented. |
| std::unordered_map<std::string, std::string> options; |
| |
| // Maximum number of temporal layer extensions supported by this codec. |
| // For example, a value of 1 indicates that 2 total layers are supported. |
| // TODO(deadbeef): Not implemented. |
| int max_temporal_layer_extensions = 0; |
| |
| // Maximum number of spatial layer extensions supported by this codec. |
| // For example, a value of 1 indicates that 2 total layers are supported. |
| // TODO(deadbeef): Not implemented. |
| int max_spatial_layer_extensions = 0; |
| |
| // Whether the implementation can send/receive SVC layers with distinct |
| // SSRCs. Always false for audio codecs. True for video codecs that support |
| // scalable video coding with MRST. |
| // TODO(deadbeef): Not implemented. |
| bool svc_multi_stream_support = false; |
| |
| bool operator==(const RtpCodecCapability& o) const { |
| return name == o.name && kind == o.kind && clock_rate == o.clock_rate && |
| preferred_payload_type == o.preferred_payload_type && |
| max_ptime == o.max_ptime && ptime == o.ptime && |
| num_channels == o.num_channels && rtcp_feedback == o.rtcp_feedback && |
| parameters == o.parameters && options == o.options && |
| max_temporal_layer_extensions == o.max_temporal_layer_extensions && |
| max_spatial_layer_extensions == o.max_spatial_layer_extensions && |
| svc_multi_stream_support == o.svc_multi_stream_support; |
| } |
| bool operator!=(const RtpCodecCapability& o) const { return !(*this == o); } |
| }; |
| |
| // Used in RtpCapabilities; represents the capabilities/preferences of an |
| // implementation for a header extension. |
| // |
| // Just called "RtpHeaderExtension" in ORTC, but the "Capability" suffix was |
| // added here for consistency and to avoid confusion with |
| // RtpHeaderExtensionParameters. |
| // |
| // Note that ORTC includes a "kind" field, but we omit this because it's |
| // redundant; if you call "RtpReceiver::GetCapabilities(MEDIA_TYPE_AUDIO)", |
| // you know you're getting audio capabilities. |
| struct RtpHeaderExtensionCapability { |
| // URI of this extension, as defined in RFC5285. |
| std::string uri; |
| |
| // Preferred value of ID that goes in the packet. |
| rtc::Optional<int> preferred_id; |
| |
| // If true, it's preferred that the value in the header is encrypted. |
| // TODO(deadbeef): Not implemented. |
| bool preferred_encrypt = false; |
| |
| bool operator==(const RtpHeaderExtensionCapability& o) const { |
| return uri == o.uri && preferred_id == o.preferred_id && |
| preferred_encrypt == o.preferred_encrypt; |
| } |
| bool operator!=(const RtpHeaderExtensionCapability& o) const { |
| return !(*this == o); |
| } |
| }; |
| |
| // Used in RtpParameters; represents a specific configuration of a header |
| // extension. |
| struct RtpHeaderExtensionParameters { |
| // URI of this extension, as defined in RFC5285. |
| std::string uri; |
| |
| // ID value that goes in the packet. |
| int id = 0; |
| |
| // If true, the value in the header is encrypted. |
| // TODO(deadbeef): Not implemented. |
| bool encrypt = false; |
| |
| bool operator==(const RtpHeaderExtensionParameters& o) const { |
| return uri == o.uri && id == o.id && encrypt == o.encrypt; |
| } |
| bool operator!=(const RtpHeaderExtensionParameters& o) const { |
| return !(*this == o); |
| } |
| }; |
| |
| struct RtpFecParameters { |
| // If unset, a value is chosen by the implementation. |
| rtc::Optional<uint32_t> ssrc; |
| |
| FecMechanism mechanism = FecMechanism::RED; |
| |
| bool operator==(const RtpFecParameters& o) const { |
| return ssrc == o.ssrc && mechanism == o.mechanism; |
| } |
| bool operator!=(const RtpFecParameters& o) const { return !(*this == o); } |
| }; |
| |
| struct RtpRtxParameters { |
| // If unset, a value is chosen by the implementation. |
| rtc::Optional<uint32_t> ssrc; |
| |
| bool operator==(const RtpRtxParameters& o) const { return ssrc == o.ssrc; } |
| bool operator!=(const RtpRtxParameters& o) const { return !(*this == o); } |
| }; |
| |
| struct RtpEncodingParameters { |
| // If unset, a value is chosen by the implementation. |
| rtc::Optional<uint32_t> ssrc; |
| |
| // Can be used to reference a codec in the |codecs| member of the |
| // RtpParameters that contains this RtpEncodingParameters. If unset, the |
| // implementation will choose the first possible codec. |
| // TODO(deadbeef): Not implemented. |
| rtc::Optional<int> codec_payload_type; |
| |
| // Specifies the FEC mechanism, if set. |
| // TODO(deadbeef): Not implemented. |
| rtc::Optional<RtpFecParameters> fec; |
| |
| // Specifies the RTX parameters, if set. |
| // TODO(deadbeef): Not implemented. |
| rtc::Optional<RtpRtxParameters> rtx; |
| |
| // Only used for audio. If set, determines whether or not discontinuous |
| // transmission will be used, if an available codec supports it. If not |
| // set, the implementation default setting will be used. |
| rtc::Optional<DtxStatus> dtx; |
| |
| // The relative priority of this encoding. |
| // TODO(deadbeef): Not implemented. |
| rtc::Optional<PriorityType> priority; |
| |
| // If set, this represents the Transport Independent Application Specific |
| // maximum bandwidth defined in RFC3890. If unset, there is no maximum |
| // bitrate. |
| // Just called "maxBitrate" in ORTC spec. |
| rtc::Optional<int> max_bitrate_bps; |
| |
| // TODO(deadbeef): Not implemented. |
| rtc::Optional<int> max_framerate; |
| |
| // For video, scale the resolution down by this factor. |
| // TODO(deadbeef): Not implemented. |
| double scale_resolution_down_by = 1.0; |
| |
| // Scale the framerate down by this factor. |
| // TODO(deadbeef): Not implemented. |
| double scale_framerate_down_by = 1.0; |
| |
| // For an RtpSender, set to true to cause this encoding to be sent, and false |
| // for it not to be sent. For an RtpReceiver, set to true to cause the |
| // encoding to be decoded, and false for it to be ignored. |
| // TODO(deadbeef): RtpReceiver part is not implemented. |
| bool active = true; |
| |
| // Value to use for RID RTP header extension. |
| // Called "encodingId" in ORTC. |
| // TODO(deadbeef): Not implemented. |
| std::string rid; |
| |
| // RIDs of encodings on which this layer depends. |
| // Called "dependencyEncodingIds" in ORTC spec. |
| // TODO(deadbeef): Not implemented. |
| std::vector<std::string> dependency_rids; |
| |
| bool operator==(const RtpEncodingParameters& o) const { |
| return ssrc == o.ssrc && codec_payload_type == o.codec_payload_type && |
| fec == o.fec && rtx == o.rtx && dtx == o.dtx && |
| priority == o.priority && max_bitrate_bps == o.max_bitrate_bps && |
| max_framerate == o.max_framerate && |
| scale_resolution_down_by == o.scale_resolution_down_by && |
| scale_framerate_down_by == o.scale_framerate_down_by && |
| active == o.active && rid == o.rid && |
| dependency_rids == o.dependency_rids; |
| } |
| bool operator!=(const RtpEncodingParameters& o) const { |
| return !(*this == o); |
| } |
| }; |
| |
| struct RtpCodecParameters { |
| // Build MIME "type/subtype" string from |name| and |kind|. |
| std::string mime_type() const { return MediaTypeToString(kind) + "/" + name; } |
| |
| // Used to identify the codec. Equivalent to MIME subtype. |
| std::string name; |
| |
| // The media type of this codec. Equivalent to MIME top-level type. |
| cricket::MediaType kind = cricket::MEDIA_TYPE_AUDIO; |
| |
| // Payload type used to identify this codec in RTP packets. |
| // This MUST always be present, and must be unique across all codecs using |
| // the same transport. |
| int payload_type = 0; |
| |
| // If unset, the implementation default is used. |
| rtc::Optional<int> clock_rate; |
| |
| // The number of audio channels used. Unset for video codecs. If unset for |
| // audio, the implementation default is used. |
| // TODO(deadbeef): The "implementation default" part is unimplemented. |
| rtc::Optional<int> num_channels; |
| |
| // The maximum packetization time to be used by an RtpSender. |
| // If |ptime| is also set, this will be ignored. |
| // TODO(deadbeef): Not implemented. |
| rtc::Optional<int> max_ptime; |
| |
| // The packetization time to be used by an RtpSender. |
| // If unset, will use any time up to max_ptime. |
| // TODO(deadbeef): Not implemented. |
| rtc::Optional<int> ptime; |
| |
| // Feedback mechanisms to be used for this codec. |
| // TODO(deadbeef): Not implemented. |
| std::vector<RtcpFeedback> rtcp_feedback; |
| |
| // Codec-specific parameters that must be signaled to the remote party. |
| // Corresponds to "a=fmtp" parameters in SDP. |
| // TODO(deadbeef): Not implemented. |
| std::unordered_map<std::string, std::string> parameters; |
| |
| bool operator==(const RtpCodecParameters& o) const { |
| return name == o.name && kind == o.kind && payload_type == o.payload_type && |
| clock_rate == o.clock_rate && num_channels == o.num_channels && |
| max_ptime == o.max_ptime && ptime == o.ptime && |
| rtcp_feedback == o.rtcp_feedback && parameters == o.parameters; |
| } |
| bool operator!=(const RtpCodecParameters& o) const { return !(*this == o); } |
| }; |
| |
| // RtpCapabilities is used to represent the static capabilities of an |
| // endpoint. An application can use these capabilities to construct an |
| // RtpParameters. |
| struct RtpCapabilities { |
| // Supported codecs. |
| std::vector<RtpCodecCapability> codecs; |
| |
| // Supported RTP header extensions. |
| std::vector<RtpHeaderExtensionCapability> header_extensions; |
| |
| // Supported Forward Error Correction (FEC) mechanisms. |
| std::vector<FecMechanism> fec; |
| |
| bool operator==(const RtpCapabilities& o) const { |
| return codecs == o.codecs && header_extensions == o.header_extensions && |
| fec == o.fec; |
| } |
| bool operator!=(const RtpCapabilities& o) const { return !(*this == o); } |
| }; |
| |
| // Note that unlike in ORTC, an RtcpParameters is not included in |
| // RtpParameters, because our API will include an additional "RtpTransport" |
| // abstraction on which RTCP parameters are set. |
| struct RtpParameters { |
| // Used when calling getParameters/setParameters with a PeerConnection |
| // RtpSender, to ensure that outdated parameters are not unintentionally |
| // applied successfully. |
| // TODO(deadbeef): Not implemented. |
| std::string transaction_id; |
| |
| // Value to use for MID RTP header extension. |
| // Called "muxId" in ORTC. |
| // TODO(deadbeef): Not implemented. |
| std::string mid; |
| |
| std::vector<RtpCodecParameters> codecs; |
| |
| // TODO(deadbeef): Not implemented. |
| std::vector<RtpHeaderExtensionParameters> header_extensions; |
| |
| std::vector<RtpEncodingParameters> encodings; |
| |
| // TODO(deadbeef): Not implemented. |
| DegradationPreference degradation_preference = |
| DegradationPreference::BALANCED; |
| |
| bool operator==(const RtpParameters& o) const { |
| return mid == o.mid && codecs == o.codecs && |
| header_extensions == o.header_extensions && |
| encodings == o.encodings && |
| degradation_preference == o.degradation_preference; |
| } |
| bool operator!=(const RtpParameters& o) const { return !(*this == o); } |
| }; |
| |
| } // namespace webrtc |
| |
| #endif // WEBRTC_API_RTPPARAMETERS_H_ |