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/*
* Copyright (c) 2004 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.
*/
#include "media/base/codec.h"
#include <algorithm>
#include <sstream>
#include "media/base/h264_profile_level_id.h"
#include "rtc_base/checks.h"
#include "rtc_base/logging.h"
#include "rtc_base/stringencode.h"
#include "rtc_base/stringutils.h"
namespace cricket {
static bool IsSameH264Profile(const CodecParameterMap& params1,
const CodecParameterMap& params2) {
const rtc::Optional<webrtc::H264::ProfileLevelId> profile_level_id =
webrtc::H264::ParseSdpProfileLevelId(params1);
const rtc::Optional<webrtc::H264::ProfileLevelId> other_profile_level_id =
webrtc::H264::ParseSdpProfileLevelId(params2);
// Compare H264 profiles, but not levels.
return profile_level_id && other_profile_level_id &&
profile_level_id->profile == other_profile_level_id->profile;
}
FeedbackParams::FeedbackParams() = default;
bool FeedbackParam::operator==(const FeedbackParam& other) const {
return _stricmp(other.id().c_str(), id().c_str()) == 0 &&
_stricmp(other.param().c_str(), param().c_str()) == 0;
}
bool FeedbackParams::operator==(const FeedbackParams& other) const {
return params_ == other.params_;
}
bool FeedbackParams::Has(const FeedbackParam& param) const {
return std::find(params_.begin(), params_.end(), param) != params_.end();
}
void FeedbackParams::Add(const FeedbackParam& param) {
if (param.id().empty()) {
return;
}
if (Has(param)) {
// Param already in |this|.
return;
}
params_.push_back(param);
RTC_CHECK(!HasDuplicateEntries());
}
void FeedbackParams::Intersect(const FeedbackParams& from) {
std::vector<FeedbackParam>::iterator iter_to = params_.begin();
while (iter_to != params_.end()) {
if (!from.Has(*iter_to)) {
iter_to = params_.erase(iter_to);
} else {
++iter_to;
}
}
}
bool FeedbackParams::HasDuplicateEntries() const {
for (std::vector<FeedbackParam>::const_iterator iter = params_.begin();
iter != params_.end(); ++iter) {
for (std::vector<FeedbackParam>::const_iterator found = iter + 1;
found != params_.end(); ++found) {
if (*found == *iter) {
return true;
}
}
}
return false;
}
Codec::Codec(int id, const std::string& name, int clockrate)
: id(id), name(name), clockrate(clockrate) {}
Codec::Codec() : id(0), clockrate(0) {}
Codec::Codec(const Codec& c) = default;
Codec::Codec(Codec&& c) = default;
Codec::~Codec() = default;
Codec& Codec::operator=(const Codec& c) = default;
Codec& Codec::operator=(Codec&& c) = default;
bool Codec::operator==(const Codec& c) const {
return this->id == c.id && // id is reserved in objective-c
name == c.name && clockrate == c.clockrate && params == c.params &&
feedback_params == c.feedback_params;
}
bool Codec::Matches(const Codec& codec) const {
// Match the codec id/name based on the typical static/dynamic name rules.
// Matching is case-insensitive.
const int kMaxStaticPayloadId = 95;
return (id <= kMaxStaticPayloadId || codec.id <= kMaxStaticPayloadId)
? (id == codec.id)
: (_stricmp(name.c_str(), codec.name.c_str()) == 0);
}
bool Codec::GetParam(const std::string& name, std::string* out) const {
CodecParameterMap::const_iterator iter = params.find(name);
if (iter == params.end())
return false;
*out = iter->second;
return true;
}
bool Codec::GetParam(const std::string& name, int* out) const {
CodecParameterMap::const_iterator iter = params.find(name);
if (iter == params.end())
return false;
return rtc::FromString(iter->second, out);
}
void Codec::SetParam(const std::string& name, const std::string& value) {
params[name] = value;
}
void Codec::SetParam(const std::string& name, int value) {
params[name] = rtc::ToString(value);
}
bool Codec::RemoveParam(const std::string& name) {
return params.erase(name) == 1;
}
void Codec::AddFeedbackParam(const FeedbackParam& param) {
feedback_params.Add(param);
}
bool Codec::HasFeedbackParam(const FeedbackParam& param) const {
return feedback_params.Has(param);
}
void Codec::IntersectFeedbackParams(const Codec& other) {
feedback_params.Intersect(other.feedback_params);
}
webrtc::RtpCodecParameters Codec::ToCodecParameters() const {
webrtc::RtpCodecParameters codec_params;
codec_params.payload_type = id;
codec_params.name = name;
codec_params.clock_rate = rtc::Optional<int>(clockrate);
return codec_params;
}
AudioCodec::AudioCodec(int id,
const std::string& name,
int clockrate,
int bitrate,
size_t channels)
: Codec(id, name, clockrate), bitrate(bitrate), channels(channels) {}
AudioCodec::AudioCodec() : Codec(), bitrate(0), channels(0) {
}
AudioCodec::AudioCodec(const AudioCodec& c) = default;
AudioCodec::AudioCodec(AudioCodec&& c) = default;
AudioCodec& AudioCodec::operator=(const AudioCodec& c) = default;
AudioCodec& AudioCodec::operator=(AudioCodec&& c) = default;
bool AudioCodec::operator==(const AudioCodec& c) const {
return bitrate == c.bitrate && channels == c.channels && Codec::operator==(c);
}
bool AudioCodec::Matches(const AudioCodec& codec) const {
// If a nonzero clockrate is specified, it must match the actual clockrate.
// If a nonzero bitrate is specified, it must match the actual bitrate,
// unless the codec is VBR (0), where we just force the supplied value.
// The number of channels must match exactly, with the exception
// that channels=0 is treated synonymously as channels=1, per RFC
// 4566 section 6: " [The channels] parameter is OPTIONAL and may be
// omitted if the number of channels is one."
// Preference is ignored.
// TODO(juberti): Treat a zero clockrate as 8000Hz, the RTP default clockrate.
return Codec::Matches(codec) &&
((codec.clockrate == 0 /*&& clockrate == 8000*/) ||
clockrate == codec.clockrate) &&
(codec.bitrate == 0 || bitrate <= 0 || bitrate == codec.bitrate) &&
((codec.channels < 2 && channels < 2) || channels == codec.channels);
}
std::string AudioCodec::ToString() const {
std::ostringstream os;
os << "AudioCodec[" << id << ":" << name << ":" << clockrate << ":" << bitrate
<< ":" << channels << "]";
return os.str();
}
webrtc::RtpCodecParameters AudioCodec::ToCodecParameters() const {
webrtc::RtpCodecParameters codec_params = Codec::ToCodecParameters();
codec_params.num_channels = rtc::Optional<int>(static_cast<int>(channels));
codec_params.kind = MEDIA_TYPE_AUDIO;
return codec_params;
}
std::string VideoCodec::ToString() const {
std::ostringstream os;
os << "VideoCodec[" << id << ":" << name << "]";
return os.str();
}
webrtc::RtpCodecParameters VideoCodec::ToCodecParameters() const {
webrtc::RtpCodecParameters codec_params = Codec::ToCodecParameters();
codec_params.kind = MEDIA_TYPE_VIDEO;
return codec_params;
}
VideoCodec::VideoCodec(int id, const std::string& name)
: Codec(id, name, kVideoCodecClockrate) {
SetDefaultParameters();
}
VideoCodec::VideoCodec(const std::string& name) : VideoCodec(0 /* id */, name) {
SetDefaultParameters();
}
VideoCodec::VideoCodec() : Codec() {
clockrate = kVideoCodecClockrate;
}
VideoCodec::VideoCodec(const webrtc::SdpVideoFormat& c)
: Codec(0 /* id */, c.name, kVideoCodecClockrate) {
params = c.parameters;
}
VideoCodec::VideoCodec(const VideoCodec& c) = default;
VideoCodec::VideoCodec(VideoCodec&& c) = default;
VideoCodec& VideoCodec::operator=(const VideoCodec& c) = default;
VideoCodec& VideoCodec::operator=(VideoCodec&& c) = default;
void VideoCodec::SetDefaultParameters() {
if (_stricmp(kH264CodecName, name.c_str()) == 0) {
// This default is set for all H.264 codecs created because
// that was the default before packetization mode support was added.
// TODO(hta): Move this to the places that create VideoCodecs from
// SDP or from knowledge of implementation capabilities.
SetParam(kH264FmtpPacketizationMode, "1");
}
}
bool VideoCodec::operator==(const VideoCodec& c) const {
return Codec::operator==(c);
}
bool VideoCodec::Matches(const VideoCodec& other) const {
if (!Codec::Matches(other))
return false;
if (CodecNamesEq(name.c_str(), kH264CodecName))
return IsSameH264Profile(params, other.params);
return true;
}
VideoCodec VideoCodec::CreateRtxCodec(int rtx_payload_type,
int associated_payload_type) {
VideoCodec rtx_codec(rtx_payload_type, kRtxCodecName);
rtx_codec.SetParam(kCodecParamAssociatedPayloadType, associated_payload_type);
return rtx_codec;
}
VideoCodec::CodecType VideoCodec::GetCodecType() const {
const char* payload_name = name.c_str();
if (_stricmp(payload_name, kRedCodecName) == 0) {
return CODEC_RED;
}
if (_stricmp(payload_name, kUlpfecCodecName) == 0) {
return CODEC_ULPFEC;
}
if (_stricmp(payload_name, kFlexfecCodecName) == 0) {
return CODEC_FLEXFEC;
}
if (_stricmp(payload_name, kRtxCodecName) == 0) {
return CODEC_RTX;
}
return CODEC_VIDEO;
}
bool VideoCodec::ValidateCodecFormat() const {
if (id < 0 || id > 127) {
LOG(LS_ERROR) << "Codec with invalid payload type: " << ToString();
return false;
}
if (GetCodecType() != CODEC_VIDEO) {
return true;
}
// Video validation from here on.
int min_bitrate = -1;
int max_bitrate = -1;
if (GetParam(kCodecParamMinBitrate, &min_bitrate) &&
GetParam(kCodecParamMaxBitrate, &max_bitrate)) {
if (max_bitrate < min_bitrate) {
LOG(LS_ERROR) << "Codec with max < min bitrate: " << ToString();
return false;
}
}
return true;
}
DataCodec::DataCodec(int id, const std::string& name)
: Codec(id, name, kDataCodecClockrate) {}
DataCodec::DataCodec() : Codec() {
clockrate = kDataCodecClockrate;
}
DataCodec::DataCodec(const DataCodec& c) = default;
DataCodec::DataCodec(DataCodec&& c) = default;
DataCodec& DataCodec::operator=(const DataCodec& c) = default;
DataCodec& DataCodec::operator=(DataCodec&& c) = default;
std::string DataCodec::ToString() const {
std::ostringstream os;
os << "DataCodec[" << id << ":" << name << "]";
return os.str();
}
bool HasNack(const Codec& codec) {
return codec.HasFeedbackParam(
FeedbackParam(kRtcpFbParamNack, kParamValueEmpty));
}
bool HasRemb(const Codec& codec) {
return codec.HasFeedbackParam(
FeedbackParam(kRtcpFbParamRemb, kParamValueEmpty));
}
bool HasTransportCc(const Codec& codec) {
return codec.HasFeedbackParam(
FeedbackParam(kRtcpFbParamTransportCc, kParamValueEmpty));
}
bool CodecNamesEq(const std::string& name1, const std::string& name2) {
return CodecNamesEq(name1.c_str(), name2.c_str());
}
bool CodecNamesEq(const char* name1, const char* name2) {
return _stricmp(name1, name2) == 0;
}
const VideoCodec* FindMatchingCodec(
const std::vector<VideoCodec>& supported_codecs,
const VideoCodec& codec) {
for (const VideoCodec& supported_codec : supported_codecs) {
if (!CodecNamesEq(codec.name, supported_codec.name))
continue;
if (CodecNamesEq(codec.name.c_str(), kH264CodecName) &&
!IsSameH264Profile(codec.params, supported_codec.params)) {
continue;
}
return &supported_codec;
}
return nullptr;
}
} // namespace cricket