/*
* 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 "util/Alloc.hxx"
#include <string.h>
#include <stdlib.h>
#ifdef ENABLE_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.LockSeek(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.LockSeek(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 ENABLE_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;
if (count < 10 || count > 256*1024)
return;
id3_byte_t *const id3_buf = static_cast<id3_byte_t*>(xalloc(count));
if (!decoder_read_full(nullptr, is, id3_buf, count)) {
free(id3_buf);
return;
}
struct id3_tag *id3_tag = id3_tag_parse(id3_buf, count);
if (id3_tag == nullptr) {
free(id3_buf);
return;
}
scan_id3_tag(id3_tag, handler, handler_ctx);
id3_tag_delete(id3_tag);
free(id3_buf);
return;
}
#endif
