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/*
* Copyright 2003-2016 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.
*/
#include "config.h"
#include "OggUtil.hxx"
#include "fs/io/Reader.hxx"
bool
OggFeed(ogg_sync_state &oy, Reader &reader, size_t size)
{
char *buffer = ogg_sync_buffer(&oy, size);
if (buffer == nullptr)
return false;
size_t nbytes = reader.Read(buffer, size);
if (nbytes == 0)
return false;
ogg_sync_wrote(&oy, nbytes);
return true;
}
bool
OggExpectPage(ogg_sync_state &oy, ogg_page &page, Reader &reader)
{
while (true) {
int r = ogg_sync_pageout(&oy, &page);
if (r != 0)
return r > 0;
if (!OggFeed(oy, reader, 1024))
return false;
}
}
bool
OggExpectPageIn(ogg_sync_state &oy, ogg_stream_state &os, Reader &reader)
{
ogg_page page;
if (!OggExpectPage(oy, page, reader))
return false;
ogg_stream_pagein(&os, &page);
return true;
}
bool
OggExpectPageSeek(ogg_sync_state &oy, ogg_page &page, Reader &reader)
{
size_t remaining_skipped = 32768;
while (true) {
int r = ogg_sync_pageseek(&oy, &page);
if (r > 0)
return true;
if (r < 0) {
/* skipped -r bytes */
size_t nbytes = -r;
if (nbytes > remaining_skipped)
/* still no ogg page - we lost our
patience, abort */
return false;
remaining_skipped -= nbytes;
continue;
}
if (!OggFeed(oy, reader, 1024))
return false;
}
}
bool
OggExpectPageSeekIn(ogg_sync_state &oy, ogg_stream_state &os, Reader &reader)
{
ogg_page page;
if (!OggExpectPageSeek(oy, page, reader))
return false;
ogg_stream_pagein(&os, &page);
return true;
}
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