145 lines
3.1 KiB
C++
145 lines
3.1 KiB
C++
/*
|
|
* Copyright (C) 2003-2014 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.
|
|
*/
|
|
|
|
/* \file
|
|
*
|
|
* This file contains functions used by the DSF and DSDIFF decoders.
|
|
*
|
|
*/
|
|
|
|
#include "config.h"
|
|
#include "DsdLib.hxx"
|
|
#include "../DecoderAPI.hxx"
|
|
#include "input/InputStream.hxx"
|
|
#include "tag/TagId3.hxx"
|
|
#include "util/Error.hxx"
|
|
|
|
#include <string.h>
|
|
|
|
#ifdef HAVE_ID3TAG
|
|
#include <id3tag.h>
|
|
#endif
|
|
|
|
bool
|
|
DsdId::Equals(const char *s) const
|
|
{
|
|
assert(s != nullptr);
|
|
assert(strlen(s) == sizeof(value));
|
|
|
|
return memcmp(value, s, sizeof(value)) == 0;
|
|
}
|
|
|
|
/**
|
|
* Skip the #input_stream to the specified offset.
|
|
*/
|
|
bool
|
|
dsdlib_skip_to(Decoder *decoder, InputStream &is,
|
|
offset_type offset)
|
|
{
|
|
if (is.IsSeekable())
|
|
return is.Seek(offset, IgnoreError());
|
|
|
|
if (is.GetOffset() > offset)
|
|
return false;
|
|
|
|
return dsdlib_skip(decoder, is, offset - is.GetOffset());
|
|
}
|
|
|
|
/**
|
|
* Skip some bytes from the #input_stream.
|
|
*/
|
|
bool
|
|
dsdlib_skip(Decoder *decoder, InputStream &is,
|
|
offset_type delta)
|
|
{
|
|
if (delta == 0)
|
|
return true;
|
|
|
|
if (is.IsSeekable())
|
|
return is.Seek(is.GetOffset() + delta, IgnoreError());
|
|
|
|
if (delta > 1024 * 1024)
|
|
/* don't skip more than one megabyte; it would be too
|
|
expensive */
|
|
return false;
|
|
|
|
return decoder_skip(decoder, is, delta);
|
|
}
|
|
|
|
bool
|
|
dsdlib_valid_freq(uint32_t samplefreq)
|
|
{
|
|
switch (samplefreq) {
|
|
case 2822400: /* DSD64, 64xFs, Fs = 44.100kHz */
|
|
case 3072000: /* DSD64 with Fs = 48.000 kHz */
|
|
case 5644800:
|
|
case 6144000:
|
|
case 11289600:
|
|
case 12288000:
|
|
case 22579200:/* DSD512 */
|
|
case 24576000:
|
|
return true;
|
|
|
|
default:
|
|
return false;
|
|
}
|
|
}
|
|
|
|
#ifdef HAVE_ID3TAG
|
|
void
|
|
dsdlib_tag_id3(InputStream &is,
|
|
const struct tag_handler *handler,
|
|
void *handler_ctx, int64_t tagoffset)
|
|
{
|
|
assert(tagoffset >= 0);
|
|
|
|
if (tagoffset == 0 || !is.KnownSize())
|
|
return;
|
|
|
|
if (!dsdlib_skip_to(nullptr, is, tagoffset))
|
|
return;
|
|
|
|
/* Prevent broken files causing problems */
|
|
const auto size = is.GetSize();
|
|
const auto offset = is.GetOffset();
|
|
if (offset >= size)
|
|
return;
|
|
|
|
const id3_length_t count = size - offset;
|
|
|
|
/* Check and limit id3 tag size to prevent a stack overflow */
|
|
id3_byte_t dsdid3[4096];
|
|
if (count == 0 || count > sizeof(dsdid3))
|
|
return;
|
|
|
|
if (!decoder_read_full(nullptr, is, dsdid3, count))
|
|
return;
|
|
|
|
struct id3_tag *id3_tag = id3_tag_parse(dsdid3, count);
|
|
if (id3_tag == nullptr)
|
|
return;
|
|
|
|
scan_id3_tag(id3_tag, handler, handler_ctx);
|
|
|
|
id3_tag_delete(id3_tag);
|
|
|
|
return;
|
|
}
|
|
#endif
|