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/*
* Copyright (c) 2016 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 MEDIA_ENGINE_PAYLOAD_TYPE_MAPPER_H_
#define MEDIA_ENGINE_PAYLOAD_TYPE_MAPPER_H_
#include <map>
#include <set>
#include "api/audio_codecs/audio_format.h"
#include "api/optional.h"
#include "media/base/codec.h"
namespace cricket {
webrtc::SdpAudioFormat AudioCodecToSdpAudioFormat(const AudioCodec& ac);
class PayloadTypeMapper {
public:
PayloadTypeMapper();
~PayloadTypeMapper();
// Finds the current payload type for |format| or assigns a new one, if no
// current mapping exists. Will return an empty value if it was unable to
// create a mapping, i.e. if all dynamic payload type ids have been used up.
rtc::Optional<int> GetMappingFor(const webrtc::SdpAudioFormat& format);
// Finds the current payload type for |format|, if any. Returns an empty value
// if no payload type mapping exists for the format.
rtc::Optional<int> FindMappingFor(const webrtc::SdpAudioFormat& format) const;
// Like GetMappingFor, but fills in an AudioCodec structure with the necessary
// information instead.
rtc::Optional<AudioCodec> ToAudioCodec(const webrtc::SdpAudioFormat& format);
private:
struct SdpAudioFormatOrdering {
bool operator()(const webrtc::SdpAudioFormat& a,
const webrtc::SdpAudioFormat& b) const;
};
int next_unused_payload_type_;
int max_payload_type_;
std::map<webrtc::SdpAudioFormat, int, SdpAudioFormatOrdering> mappings_;
std::set<int> used_payload_types_;
};
} // namespace cricket
#endif // MEDIA_ENGINE_PAYLOAD_TYPE_MAPPER_H_
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