88 lines
2.3 KiB
C++
88 lines
2.3 KiB
C++
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/*
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* Copyright 2003-2016 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" /* must be first for large file support */
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#include "OggDecoder.hxx"
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#include "lib/xiph/OggFind.hxx"
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#include "input/InputStream.hxx"
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#include "util/Error.hxx"
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/**
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* Load the end-of-stream packet and restore the previous file
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* position.
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*/
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bool
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OggDecoder::LoadEndPacket(ogg_packet &packet) const
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{
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if (!input_stream.CheapSeeking())
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/* we do this for local files only, because seeking
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around remote files is expensive and not worth the
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trouble */
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return false;
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const auto old_offset = input_stream.GetOffset();
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/* create temporary Ogg objects for seeking and parsing the
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EOS packet */
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bool result;
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{
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DecoderReader reader(decoder, input_stream);
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OggSyncState sync2(reader);
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OggStreamState stream2(GetSerialNo());
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result = OggSeekFindEOS(sync2, stream2, packet,
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input_stream);
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}
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/* restore the previous file position */
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input_stream.LockSeek(old_offset, IgnoreError());
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return result;
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}
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ogg_int64_t
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OggDecoder::LoadEndGranulePos() const
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{
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ogg_packet packet;
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if (!LoadEndPacket(packet))
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return -1;
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return packet.granulepos;
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}
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bool
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OggDecoder::SeekGranulePos(ogg_int64_t where_granulepos, Error &error)
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{
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assert(IsSeekable());
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/* interpolate the file offset where we expect to find the
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given granule position */
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/* TODO: implement binary search */
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offset_type offset(where_granulepos * input_stream.GetSize()
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/ end_granulepos);
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if (!input_stream.LockSeek(offset, error))
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return false;
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PostSeek();
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return true;
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}
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