334 lines
9.6 KiB
C++
334 lines
9.6 KiB
C++
/*
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* Copyright (c) 2004 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 "webrtc/media/base/codec.h"
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#include <algorithm>
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#include <sstream>
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#include "webrtc/base/common.h"
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#include "webrtc/base/logging.h"
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#include "webrtc/base/stringencode.h"
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#include "webrtc/base/stringutils.h"
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namespace cricket {
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const int kMaxPayloadId = 127;
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bool FeedbackParam::operator==(const FeedbackParam& other) const {
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return _stricmp(other.id().c_str(), id().c_str()) == 0 &&
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_stricmp(other.param().c_str(), param().c_str()) == 0;
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}
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bool FeedbackParams::operator==(const FeedbackParams& other) const {
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return params_ == other.params_;
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}
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bool FeedbackParams::Has(const FeedbackParam& param) const {
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return std::find(params_.begin(), params_.end(), param) != params_.end();
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}
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void FeedbackParams::Add(const FeedbackParam& param) {
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if (param.id().empty()) {
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return;
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}
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if (Has(param)) {
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// Param already in |this|.
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return;
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}
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params_.push_back(param);
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ASSERT(!HasDuplicateEntries());
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}
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void FeedbackParams::Intersect(const FeedbackParams& from) {
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std::vector<FeedbackParam>::iterator iter_to = params_.begin();
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while (iter_to != params_.end()) {
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if (!from.Has(*iter_to)) {
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iter_to = params_.erase(iter_to);
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} else {
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++iter_to;
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}
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}
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}
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bool FeedbackParams::HasDuplicateEntries() const {
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for (std::vector<FeedbackParam>::const_iterator iter = params_.begin();
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iter != params_.end(); ++iter) {
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for (std::vector<FeedbackParam>::const_iterator found = iter + 1;
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found != params_.end(); ++found) {
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if (*found == *iter) {
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return true;
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}
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}
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}
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return false;
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}
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Codec::Codec(int id, const std::string& name, int clockrate)
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: id(id), name(name), clockrate(clockrate) {}
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Codec::Codec() : id(0), clockrate(0) {}
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Codec::Codec(const Codec& c) = default;
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Codec::~Codec() = default;
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Codec& Codec::operator=(const Codec& c) {
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this->id = c.id; // id is reserved in objective-c
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name = c.name;
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clockrate = c.clockrate;
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params = c.params;
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feedback_params = c.feedback_params;
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return *this;
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}
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bool Codec::operator==(const Codec& c) const {
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return this->id == c.id && // id is reserved in objective-c
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name == c.name && clockrate == c.clockrate && params == c.params &&
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feedback_params == c.feedback_params;
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}
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bool Codec::Matches(const Codec& codec) const {
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// Match the codec id/name based on the typical static/dynamic name rules.
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// Matching is case-insensitive.
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const int kMaxStaticPayloadId = 95;
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return (codec.id <= kMaxStaticPayloadId) ?
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(id == codec.id) : (_stricmp(name.c_str(), codec.name.c_str()) == 0);
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}
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bool Codec::GetParam(const std::string& name, std::string* out) const {
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CodecParameterMap::const_iterator iter = params.find(name);
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if (iter == params.end())
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return false;
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*out = iter->second;
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return true;
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}
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bool Codec::GetParam(const std::string& name, int* out) const {
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CodecParameterMap::const_iterator iter = params.find(name);
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if (iter == params.end())
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return false;
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return rtc::FromString(iter->second, out);
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}
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void Codec::SetParam(const std::string& name, const std::string& value) {
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params[name] = value;
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}
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void Codec::SetParam(const std::string& name, int value) {
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params[name] = rtc::ToString(value);
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}
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bool Codec::RemoveParam(const std::string& name) {
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return params.erase(name) == 1;
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}
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void Codec::AddFeedbackParam(const FeedbackParam& param) {
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feedback_params.Add(param);
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}
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bool Codec::HasFeedbackParam(const FeedbackParam& param) const {
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return feedback_params.Has(param);
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}
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void Codec::IntersectFeedbackParams(const Codec& other) {
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feedback_params.Intersect(other.feedback_params);
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}
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webrtc::RtpCodecParameters Codec::ToCodecParameters() const {
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webrtc::RtpCodecParameters codec_params;
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codec_params.payload_type = id;
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codec_params.mime_type = name;
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codec_params.clock_rate = clockrate;
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return codec_params;
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}
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AudioCodec::AudioCodec(int id,
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const std::string& name,
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int clockrate,
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int bitrate,
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size_t channels)
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: Codec(id, name, clockrate), bitrate(bitrate), channels(channels) {}
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AudioCodec::AudioCodec() : Codec(), bitrate(0), channels(0) {
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}
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AudioCodec::AudioCodec(const AudioCodec& c) = default;
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AudioCodec& AudioCodec::operator=(const AudioCodec& c) {
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Codec::operator=(c);
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bitrate = c.bitrate;
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channels = c.channels;
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return *this;
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}
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bool AudioCodec::operator==(const AudioCodec& c) const {
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return bitrate == c.bitrate && channels == c.channels && Codec::operator==(c);
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}
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bool AudioCodec::Matches(const AudioCodec& codec) const {
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// If a nonzero clockrate is specified, it must match the actual clockrate.
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// If a nonzero bitrate is specified, it must match the actual bitrate,
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// unless the codec is VBR (0), where we just force the supplied value.
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// The number of channels must match exactly, with the exception
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// that channels=0 is treated synonymously as channels=1, per RFC
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// 4566 section 6: " [The channels] parameter is OPTIONAL and may be
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// omitted if the number of channels is one."
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// Preference is ignored.
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// TODO(juberti): Treat a zero clockrate as 8000Hz, the RTP default clockrate.
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return Codec::Matches(codec) &&
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((codec.clockrate == 0 /*&& clockrate == 8000*/) ||
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clockrate == codec.clockrate) &&
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(codec.bitrate == 0 || bitrate <= 0 || bitrate == codec.bitrate) &&
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((codec.channels < 2 && channels < 2) || channels == codec.channels);
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}
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webrtc::RtpCodecParameters AudioCodec::ToCodecParameters() const {
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webrtc::RtpCodecParameters codec_params = Codec::ToCodecParameters();
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codec_params.channels = channels;
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return codec_params;
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}
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std::string AudioCodec::ToString() const {
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std::ostringstream os;
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os << "AudioCodec[" << id << ":" << name << ":" << clockrate << ":" << bitrate
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<< ":" << channels << "]";
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return os.str();
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}
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std::string VideoCodec::ToString() const {
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std::ostringstream os;
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os << "VideoCodec[" << id << ":" << name << ":" << width << ":" << height
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<< ":" << framerate << "]";
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return os.str();
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}
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VideoCodec::VideoCodec(int id,
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const std::string& name,
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int width,
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int height,
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int framerate)
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: Codec(id, name, kVideoCodecClockrate),
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width(width),
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height(height),
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framerate(framerate) {}
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VideoCodec::VideoCodec(int id, const std::string& name)
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: Codec(id, name, kVideoCodecClockrate),
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width(0),
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height(0),
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framerate(0) {}
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VideoCodec::VideoCodec() : Codec(), width(0), height(0), framerate(0) {
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clockrate = kVideoCodecClockrate;
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}
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VideoCodec::VideoCodec(const VideoCodec& c) = default;
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VideoCodec& VideoCodec::operator=(const VideoCodec& c) {
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Codec::operator=(c);
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width = c.width;
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height = c.height;
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framerate = c.framerate;
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return *this;
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}
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bool VideoCodec::operator==(const VideoCodec& c) const {
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return width == c.width && height == c.height && framerate == c.framerate &&
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Codec::operator==(c);
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}
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VideoCodec VideoCodec::CreateRtxCodec(int rtx_payload_type,
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int associated_payload_type) {
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VideoCodec rtx_codec(rtx_payload_type, kRtxCodecName, 0, 0, 0);
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rtx_codec.SetParam(kCodecParamAssociatedPayloadType, associated_payload_type);
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return rtx_codec;
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}
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VideoCodec::CodecType VideoCodec::GetCodecType() const {
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const char* payload_name = name.c_str();
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if (_stricmp(payload_name, kRedCodecName) == 0) {
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return CODEC_RED;
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}
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if (_stricmp(payload_name, kUlpfecCodecName) == 0) {
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return CODEC_ULPFEC;
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}
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if (_stricmp(payload_name, kRtxCodecName) == 0) {
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return CODEC_RTX;
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}
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return CODEC_VIDEO;
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}
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bool VideoCodec::ValidateCodecFormat() const {
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if (id < 0 || id > 127) {
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LOG(LS_ERROR) << "Codec with invalid payload type: " << ToString();
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return false;
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}
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if (GetCodecType() != CODEC_VIDEO) {
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return true;
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}
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// Video validation from here on.
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if (width <= 0 || height <= 0) {
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LOG(LS_ERROR) << "Codec with invalid dimensions: " << ToString();
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return false;
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}
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int min_bitrate = -1;
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int max_bitrate = -1;
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if (GetParam(kCodecParamMinBitrate, &min_bitrate) &&
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GetParam(kCodecParamMaxBitrate, &max_bitrate)) {
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if (max_bitrate < min_bitrate) {
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LOG(LS_ERROR) << "Codec with max < min bitrate: " << ToString();
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return false;
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}
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}
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return true;
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}
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DataCodec::DataCodec(int id, const std::string& name)
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: Codec(id, name, kDataCodecClockrate) {}
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DataCodec::DataCodec() : Codec() {
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clockrate = kDataCodecClockrate;
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}
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DataCodec::DataCodec(const DataCodec& c) = default;
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DataCodec& DataCodec::operator=(const DataCodec& c) = default;
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std::string DataCodec::ToString() const {
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std::ostringstream os;
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os << "DataCodec[" << id << ":" << name << "]";
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return os.str();
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}
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bool HasNack(const Codec& codec) {
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return codec.HasFeedbackParam(
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FeedbackParam(kRtcpFbParamNack, kParamValueEmpty));
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}
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bool HasRemb(const Codec& codec) {
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return codec.HasFeedbackParam(
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FeedbackParam(kRtcpFbParamRemb, kParamValueEmpty));
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}
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bool HasTransportCc(const Codec& codec) {
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return codec.HasFeedbackParam(
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FeedbackParam(kRtcpFbParamTransportCc, kParamValueEmpty));
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}
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bool CodecNamesEq(const std::string& name1, const std::string& name2) {
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return _stricmp(name1.c_str(), name2.c_str()) == 0;
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}
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} // namespace cricket
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