85 lines
2.7 KiB
C++
85 lines
2.7 KiB
C++
/* Copyright(C) 2007-2016 VoIP objects (voipobjects.com)
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef __MT_CODEC_H
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#define __MT_CODEC_H
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#include "resiprocate/resip/stack/SdpContents.hxx"
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#include "../helper/HL_Types.h"
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#include <map>
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#include "../helper/HL_Pointer.h"
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#include "../audio/Audio_Interface.h"
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namespace MT
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{
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class Codec;
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typedef std::shared_ptr<Codec> PCodec;
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class CodecMap: public std::map<int, PCodec>
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{};
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class Codec
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{
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public:
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class Factory
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{
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public:
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virtual ~Factory() {}
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virtual const char* name() = 0;
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virtual int samplerate() = 0;
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virtual int payloadType() = 0;
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virtual PCodec create() = 0;
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virtual int channels();
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typedef std::map<int, PCodec > CodecMap;
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virtual void create(CodecMap& codecs);
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virtual void updateSdp(resip::SdpContents::Session::Medium::CodecContainer& codecs, SdpDirection direction);
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// Returns payload type from chosen codec if success. -1 is returned for negative result.
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virtual int processSdp(const resip::SdpContents::Session::Medium::CodecContainer& codecs, SdpDirection direction);
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resip::Codec resipCodec();
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};
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virtual ~Codec() {}
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virtual const char* name() = 0;
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virtual int samplerate() = 0;
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virtual float timestampUnit() { return float(1.0 / samplerate()); }
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// Size of decoded audio frame in bytes
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virtual int pcmLength() = 0;
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// Time length of single audio frame
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virtual int frameTime() = 0;
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// Size of RTP frame in bytes. Can be zero for variable sized codecs.
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virtual int rtpLength() = 0;
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// Number of audio channels
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virtual int channels() { return 1; }
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// Returns size of encoded data (RTP) in bytes
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struct EncodeResult
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{
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size_t mEncoded = 0; // Number of encoded bytes
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};
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virtual EncodeResult encode(std::span<const uint8_t> input, std::span<uint8_t> output) = 0;
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// Returns size of decoded data (PCM signed short) in bytes
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struct DecodeResult
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{
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size_t mDecoded = 0; // Number of decoded bytes
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bool mIsCng = false; // Should this packet to be used as CNG ? (used for AMR codecs)
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};
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virtual DecodeResult decode(std::span<const uint8_t> input, std::span<uint8_t> output) = 0;
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// Returns size of produced data (PCM signed short) in bytes
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virtual size_t plc(int lostFrames, std::span<uint8_t> output) = 0;
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// Returns size of codec in memory
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virtual size_t getSize() const { return 0; };
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virtual Audio::Format getAudioFormat() { return Audio::Format(this->samplerate(), this->channels());};
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};
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}
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#endif
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