1536b5a9d6
Using libopus and libogg.
98 lines
2.2 KiB
C++
98 lines
2.2 KiB
C++
/*
|
|
* Copyright (C) 2003-2012 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.
|
|
*/
|
|
|
|
#ifndef MPD_OPUS_READER_HXX
|
|
#define MPD_OPUS_READER_HXX
|
|
|
|
#include "check.h"
|
|
|
|
#include <stdint.h>
|
|
#include <string.h>
|
|
|
|
class OpusReader {
|
|
const uint8_t *p, *const end;
|
|
|
|
public:
|
|
OpusReader(const void *_p, size_t size)
|
|
:p((const uint8_t *)_p), end(p + size) {}
|
|
|
|
bool Skip(size_t length) {
|
|
p += length;
|
|
return p <= end;
|
|
}
|
|
|
|
const void *Read(size_t length) {
|
|
const uint8_t *result = p;
|
|
return Skip(length)
|
|
? result
|
|
: nullptr;
|
|
}
|
|
|
|
bool Expect(const void *value, size_t length) {
|
|
const void *data = Read(length);
|
|
return data != nullptr && memcmp(value, data, length) == 0;
|
|
}
|
|
|
|
bool ReadByte(uint8_t &value_r) {
|
|
if (p >= end)
|
|
return false;
|
|
|
|
value_r = *p++;
|
|
return true;
|
|
}
|
|
|
|
bool ReadShort(uint16_t &value_r) {
|
|
const uint8_t *value = (const uint8_t *)Read(sizeof(value_r));
|
|
if (value == nullptr)
|
|
return false;
|
|
|
|
value_r = value[0] | (value[1] << 8);
|
|
return true;
|
|
}
|
|
|
|
bool ReadWord(uint32_t &value_r) {
|
|
const uint8_t *value = (const uint8_t *)Read(sizeof(value_r));
|
|
if (value == nullptr)
|
|
return false;
|
|
|
|
value_r = value[0] | (value[1] << 8)
|
|
| (value[2] << 16) | (value[3] << 24);
|
|
return true;
|
|
}
|
|
|
|
bool SkipString() {
|
|
uint32_t length;
|
|
return ReadWord(length) && Skip(length);
|
|
}
|
|
|
|
char *ReadString() {
|
|
uint32_t length;
|
|
if (!ReadWord(length))
|
|
return nullptr;
|
|
|
|
const char *src = (const char *)Read(length);
|
|
if (src == nullptr)
|
|
return nullptr;
|
|
|
|
return strndup(src, length);
|
|
}
|
|
};
|
|
|
|
#endif
|