102 lines
2.0 KiB
C++
102 lines
2.0 KiB
C++
/*
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* Copyright 2003-2017 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include "OggVisitor.hxx"
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#include <stdexcept>
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void
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OggVisitor::EndStream()
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{
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if (!has_stream)
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return;
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has_stream = false;
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OnOggEnd();
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}
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inline bool
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OggVisitor::ReadNextPage()
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{
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ogg_page page;
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if (!sync.ExpectPage(page))
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return false;
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const auto page_serialno = ogg_page_serialno(&page);
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if (page_serialno != stream.GetSerialNo()) {
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EndStream();
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stream.Reinitialize(page_serialno);
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}
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stream.PageIn(page);
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return true;
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}
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inline void
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OggVisitor::HandlePacket(const ogg_packet &packet)
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{
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if (packet.b_o_s) {
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EndStream();
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has_stream = true;
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OnOggBeginning(packet);
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return;
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}
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if (!has_stream)
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/* fail if BOS is missing */
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throw std::runtime_error("BOS packet expected");
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if (packet.e_o_s) {
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EndStream();
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return;
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}
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OnOggPacket(packet);
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}
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inline void
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OggVisitor::HandlePackets()
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{
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ogg_packet packet;
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while (stream.PacketOut(packet) == 1)
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HandlePacket(packet);
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}
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void
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OggVisitor::Visit()
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{
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do {
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HandlePackets();
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} while (ReadNextPage());
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}
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void
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OggVisitor::PostSeek()
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{
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sync.Reset();
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/* reset the stream to clear any previous partial packet
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data */
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stream.Reset();
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/* find the next Ogg page and feed it into the stream */
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sync.ExpectPageSeekIn(stream);
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}
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