4faef28cc5
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159 lines
3.3 KiB
C++
159 lines
3.3 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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/* \file
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*
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* This file contains functions used by the DSF and DSDIFF decoders.
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*
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*/
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#include "config.h"
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#include "DsdLib.hxx"
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#include "../DecoderAPI.hxx"
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#include "input/InputStream.hxx"
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#include "tag/Id3Scan.hxx"
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#ifdef ENABLE_ID3TAG
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#include <id3tag.h>
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#endif
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#include <stdexcept>
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#include <string.h>
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#include <stdlib.h>
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bool
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DsdId::Equals(const char *s) const noexcept
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{
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assert(s != nullptr);
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assert(strlen(s) == sizeof(value));
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return memcmp(value, s, sizeof(value)) == 0;
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}
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/**
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* Skip the #InputStream to the specified offset.
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*/
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bool
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dsdlib_skip_to(DecoderClient *client, InputStream &is,
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offset_type offset)
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{
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if (is.IsSeekable()) {
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try {
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is.LockSeek(offset);
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} catch (const std::runtime_error &) {
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return false;
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}
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}
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if (is.GetOffset() > offset)
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return false;
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return dsdlib_skip(client, is, offset - is.GetOffset());
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}
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/**
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* Skip some bytes from the #InputStream.
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*/
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bool
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dsdlib_skip(DecoderClient *client, InputStream &is,
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offset_type delta)
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{
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if (delta == 0)
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return true;
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if (is.IsSeekable()) {
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try {
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is.LockSeek(is.GetOffset() + delta);
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} catch (const std::runtime_error &) {
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return false;
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}
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}
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if (delta > 1024 * 1024)
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/* don't skip more than one megabyte; it would be too
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expensive */
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return false;
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return decoder_skip(client, is, delta);
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}
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bool
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dsdlib_valid_freq(uint32_t samplefreq) noexcept
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{
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switch (samplefreq) {
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case 2822400: /* DSD64, 64xFs, Fs = 44.100kHz */
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case 3072000: /* DSD64 with Fs = 48.000 kHz */
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case 5644800:
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case 6144000:
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case 11289600:
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case 12288000:
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case 22579200:/* DSD512 */
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case 24576000:
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return true;
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default:
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return false;
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}
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}
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#ifdef ENABLE_ID3TAG
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void
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dsdlib_tag_id3(InputStream &is,
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const TagHandler &handler,
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void *handler_ctx, offset_type tagoffset)
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{
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if (tagoffset == 0 || !is.KnownSize())
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return;
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/* Prevent broken files causing problems */
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const auto size = is.GetSize();
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if (tagoffset >= size)
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return;
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const auto count64 = size - tagoffset;
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if (count64 < 10 || count64 > 1024 * 1024)
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return;
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if (!dsdlib_skip_to(nullptr, is, tagoffset))
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return;
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const id3_length_t count = count64;
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id3_byte_t *const id3_buf = new id3_byte_t[count];
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if (id3_buf == nullptr)
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return;
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if (!decoder_read_full(nullptr, is, id3_buf, count)) {
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delete[] id3_buf;
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return;
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}
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struct id3_tag *id3_tag = id3_tag_parse(id3_buf, count);
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delete[] id3_buf;
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if (id3_tag == nullptr)
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return;
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scan_id3_tag(id3_tag, handler, handler_ctx);
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id3_tag_delete(id3_tag);
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return;
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}
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#endif
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