FFmpegAPIResolver.h

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/**********************************************************************
 
  Audacity: A Digital Audio Editor
 
  FFmpegAPIResolver.h
 
  Dmitry Vedenko
 
**********************************************************************/
#pragma once
 
#include <memory>
#include <vector>
#include <map>
 
#include "FFmpegTypes.h"
#include "AVCodecID.h"
 
struct FFmpegFunctions;
class FFmpegLog;
 
class AVCodecContextWrapper;
class AVCodecWrapper;
class AVPacketWrapper;
class AVChannelLayoutWrapper;
 
struct AVCodecIDResolver final
{
   AVCodecIDFwd (*GetAVCodecID)(AudacityAVCodecID);
   AudacityAVCodecID (*GetAudacityCodecID)(AVCodecIDFwd);
};
 
struct AVCodecFactories final
{
   std::unique_ptr<AVCodecContextWrapper> (*CreateAVCodecContextWrapper)(const FFmpegFunctions&, AVCodecContext*) = nullptr;
   std::unique_ptr<AVCodecContextWrapper> (*CreateAVCodecContextWrapperFromCodec)(const FFmpegFunctions&, std::unique_ptr<AVCodecWrapper>) = nullptr;
   std::unique_ptr<AVCodecWrapper> (*CreateAVCodecWrapper) (const AVCodec*) = nullptr;
 
   std::unique_ptr<AVPacketWrapper> (*CreateAVPacketWrapper) (const FFmpegFunctions&) = nullptr;
};
 
class AVFormatContextWrapper;
class AVInputFormatWrapper;
class AVIOContextWrapper;
class AVOutputFormatWrapper;
class AVStreamWrapper;
 
struct AVFormatFactories final
{
   std::unique_ptr<AVFormatContextWrapper> (*CreateAVFormatContextWrapper) (const FFmpegFunctions&) = nullptr;
   std::unique_ptr<AVInputFormatWrapper> (*CreateAVInputFormatWrapper) (AVInputFormat*) = nullptr;
   std::unique_ptr<AVIOContextWrapper> (*CreateAVIOContextWrapper) (const FFmpegFunctions&) = nullptr;
   std::unique_ptr<AVOutputFormatWrapper> (*CreateAVOutputFormatWrapper) (const AVOutputFormat*) = nullptr;
   std::unique_ptr<AVStreamWrapper> (*CreateAVStreamWrapper) (const FFmpegFunctions&, AVStream*, bool) = nullptr;
};
 
class AVFrameWrapper;
 
struct AVUtilFactories final
{
   std::unique_ptr<AVFrameWrapper> (*CreateAVFrameWrapper)(const FFmpegFunctions&) = nullptr;
   std::unique_ptr<FFmpegLog> (*CreateLogCallbackSetter)(const FFmpegFunctions&) = nullptr;
 
   std::unique_ptr<AVChannelLayoutWrapper> (*CreateDefaultChannelLayout)(const FFmpegFunctions&, int channelsCount) = nullptr;
   std::unique_ptr<AVChannelLayoutWrapper> (*CreateLegacyChannelLayout)(const FFmpegFunctions&, uint64_t layout, int channelsCount) = nullptr;
   std::unique_ptr<AVChannelLayoutWrapper> (*CreateAVChannelLayout)(const FFmpegFunctions&, const AVChannelLayout* layout) = nullptr;
};
 
class FFmpegAPIResolver final
{
   FFmpegAPIResolver() = default;
 
public:
   static FFmpegAPIResolver& Get();
 
   bool GetAVCodecIDResolver(int avCodecVersion, AVCodecIDResolver& resolver) const;
   bool GetAVCodecFactories(int avCodecVersion, AVCodecFactories& factories) const;
   bool GetAVFormatFactories(int avFormatVersion, AVFormatFactories& factories) const;
   bool GetAVUtilFactories(int avUtilVersion, AVUtilFactories& factories) const;
 
   void AddAVCodecIDResolver(int avCodecVersion, const AVCodecIDResolver& resolver);
   void AddAVCodecFactories(int avCodecVersion, const AVCodecFactories& factories);
   void AddAVFormatFactories(int avFormatVersion, const AVFormatFactories& factories);
   void AddAVUtilFactories(int avUtilVersion, const AVUtilFactories& factories);
 
   std::vector<int> GetSuportedAVFormatVersions() const;
 
private:
   std::map<int, AVCodecIDResolver> mAVCodecIDResolvers;
   std::map<int, AVCodecFactories> mAVCodecFactories;
   std::map<int, AVFormatFactories> mAVFormatFactories;
   std::map<int, AVUtilFactories> mAVUtilFactories;
};