/* * Copyright 2003-2018 The Music Player Daemon Project * http://www.musicpd.org * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #ifndef MPD_OGG_VISITOR_HXX #define MPD_OGG_VISITOR_HXX #include "OggSyncState.hxx" #include "OggStreamState.hxx" #include #include class Reader; /** * Abstract class which iterates over Ogg packets in a #Reader. * Subclass it and implement the virtual methods. */ class OggVisitor { OggSyncState sync; OggStreamState stream; bool has_stream = false; public: explicit OggVisitor(Reader &reader) :sync(reader), stream(0) {} long GetSerialNo() const { return stream.GetSerialNo(); } void Visit(); /** * Call this method after seeking the #Reader. */ void PostSeek(); private: void EndStream(); bool ReadNextPage(); void HandlePacket(const ogg_packet &packet); void HandlePackets(); protected: virtual void OnOggBeginning(const ogg_packet &packet) = 0; virtual void OnOggPacket(const ogg_packet &packet) = 0; virtual void OnOggEnd() = 0; }; #endif