Handlers.h

#pragma once

#include "Handler.h"

#include <list>

// Audio format handlers
class Handlers
{
public:
	Handlers();

	virtual ~Handlers();

	// Opens a decoder.
	// 'filename' - file to open.
	// Returns the decoder, or nullptr if the stream could not be opened.
	Decoder::Ptr OpenDecoder( const std::wstring& filename ) const;

	// Reads 'tags' from 'filename', returning true if the tags were read.
	bool GetTags( const std::wstring& filename, Tags& tags ) const;

	// Writes 'tags' to 'filename', returning true if the tags were written.
	bool SetTags( const std::wstring& filename, const Tags& tags ) const;

	// Returns all the file extensions supported by the decoders, as a set of lowercase strings.
	std::set<std::wstring> GetAllSupportedFileExtensions() const;

	// Returns the BASS library version.
	std::wstring GetBassVersion() const;

	// Adds a 'handler'.
	void AddHandler( Handler::Ptr handler );

	// Returns the available encoders.
	Handler::List GetEncoders() const;

	// Opens a encoder matching the 'description'.
	// Returns the encoder, or nullptr if an encoder could not be opened.
	Encoder::Ptr OpenEncoder( const std::wstring& description ) const;

	// Called when the application 'settings' have changed.
	void SettingsChanged( Settings& settings ) const;

	// Initialises the handlers with the application 'settings'.
	void Init( Settings& settings );

private:
	// Returns a decoder handler supported by the 'filename' extension, or nullptr of there was no match.
	Handler::Ptr FindDecoderHandler( const std::wstring& filename ) const;

	// BASS Handler.
	Handler::Ptr m_HandlerBASS;

	// FFmpeg handler.
	Handler::Ptr m_HandlerFFmpeg;

	// Available handlers.
	Handler::List m_Handlers;

	// Available decoders.
	Handler::List m_Decoders;

	// Available encoders.
	Handler::List m_Encoders;
};