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/*
* Copyright (C) 2000-2007 the xine project
*
* This file is part of xine, a free video player.
*
* xine 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.
*
* xine 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, USA
*
* ID3 tag parser
*
* Supported versions: v1, v1.1, v2.2, v2.3, v2.4
*/
#ifndef ID3_H
#define ID3_H
#include "xine_internal.h"
#include "xineutils.h"
#include "bswap.h"
/* id3v2 */
#define FOURCC_TAG BE_FOURCC
#define ID3V22_TAG FOURCC_TAG('I', 'D', '3', 2) /* id3 v2.2 header tag */
#define ID3V23_TAG FOURCC_TAG('I', 'D', '3', 3) /* id3 v2.3 header tag */
#define ID3V24_TAG FOURCC_TAG('I', 'D', '3', 4) /* id3 v2.4 header tag */
#define ID3V24_FOOTER_TAG FOURCC_TAG('3', 'D', 'I', 0) /* id3 v2.4 footer tag */
/*
* ID3 v2.2
*/
/* tag header */
#define ID3V22_UNSYNCH_FLAG 0x80
#define ID3V22_COMPRESS_FLAG 0x40
#define ID3V22_ZERO_FLAG 0x3F
/* frame header */
#define ID3V22_FRAME_HEADER_SIZE 6
/*
* ID3 v2.3
*/
/* tag header */
#define ID3V23_UNSYNCH_FLAG 0x80
#define ID3V23_EXT_HEADER_FLAG 0x40
#define ID3V23_EXPERIMENTAL_FLAG 0x20
#define ID3V23_ZERO_FLAG 0x1F
/* frame header */
#define ID3V23_FRAME_HEADER_SIZE 10
#define ID3V23_FRAME_TAG_PRESERV_FLAG 0x8000
#define ID3V23_FRAME_FILE_PRESERV_FLAG 0x4000
#define ID3V23_FRAME_READ_ONLY_FLAG 0x2000
#define ID3V23_FRAME_COMPRESS_FLAG 0x0080
#define ID3V23_FRAME_ENCRYPT_FLAG 0x0040
#define ID3V23_FRAME_GROUP_ID_FLAG 0x0020
#define ID3V23_FRAME_ZERO_FLAG 0x1F1F
/*
* ID3 v2.4
*/
/* tag header */
#define ID3V24_UNSYNCH_FLAG 0x80
#define ID3V24_EXT_HEADER_FLAG 0x40
#define ID3V24_EXPERIMENTAL_FLAG 0x20
#define ID3V24_FOOTER_FLAG 0x10
#define ID3V24_ZERO_FLAG 0x0F
/* extended header */
#define ID3V24_EXT_UPDATE_FLAG 0x40
#define ID3V24_EXT_CRC_FLAG 0x20
#define ID3V24_EXT_RESTRICTIONS_FLAG 0x10
#define ID3V24_EXT_ZERO_FLAG 0x8F
/* frame header */
#define ID3V24_FRAME_HEADER_SIZE 10
#define ID3V24_FRAME_TAG_PRESERV_FLAG 0x4000
#define ID3V24_FRAME_FILE_PRESERV_FLAG 0x2000
#define ID3V24_FRAME_READ_ONLY_FLAG 0x1000
#define ID3V24_FRAME_GROUP_ID_FLAG 0x0040
#define ID3V24_FRAME_COMPRESS_FLAG 0x0008
#define ID3V24_FRAME_ENCRYPT_FLAG 0x0004
#define ID3V24_FRAME_UNSYNCH_FLAG 0x0002
#define ID3V24_FRAME_DATA_LEN_FLAG 0x0001
#define ID3V24_FRAME_ZERO_FLAG 0x8FB0
/* footer */
#define ID3V24_FOOTER_SIZE 10
typedef struct {
uint32_t id;
uint8_t revision;
uint8_t flags;
uint32_t size;
} id3v2_header_t;
typedef struct {
uint32_t id;
uint32_t size;
} id3v22_frame_header_t;
typedef struct {
uint32_t id;
uint32_t size;
uint16_t flags;
} id3v23_frame_header_t;
typedef struct {
uint32_t size;
uint16_t flags;
uint32_t padding_size;
uint32_t crc;
} id3v23_frame_ext_header_t;
typedef id3v2_header_t id3v24_footer_t;
typedef struct {
uint32_t id;
uint32_t size;
uint16_t flags;
} id3v24_frame_header_t;
typedef struct {
uint32_t size;
uint8_t flags;
uint32_t crc;
uint8_t restrictions;
} id3v24_frame_ext_header_t;
typedef struct {
char tag[3];
char title[30];
char artist[30];
char album[30];
char year[4];
char comment[30];
uint8_t genre;
} id3v1_tag_t;
int id3v1_parse_tag (input_plugin_t *input, xine_stream_t *stream);
int id3v22_parse_tag(input_plugin_t *input,
xine_stream_t *stream,
int8_t *mp3_frame_header);
int id3v23_parse_tag(input_plugin_t *input,
xine_stream_t *stream,
int8_t *mp3_frame_header);
int id3v24_parse_tag(input_plugin_t *input,
xine_stream_t *stream,
int8_t *mp3_frame_header);
/* Generic function that switch between the three above */
int id3v2_parse_tag(input_plugin_t *input,
xine_stream_t *stream,
int8_t *mp3_frame_header);
/**
* @brief Checks if the given buffer is an ID3 tag preamble
* @param ptr Pointer to the first 10 bytes of the ID3 tag
*/
static inline int id3v2_istag(uint8_t *ptr) {
return
(ptr[0] == 'I') &&
(ptr[1] == 'D') &&
(ptr[2] == '3');
}
#if 0
/* parse an unsynchronized 16bits integer */
static inline uint16_t _X_BE_16_synchsafe(uint8_t buf[2]) {
return ((uint16_t)(buf[0] & 0x7F) << 7) |
(uint16_t)(buf[1] & 0x7F);
}
#endif
/* parse an unsynchronized 24bits integer */
static inline uint32_t _X_BE_24_synchsafe(uint8_t buf[3]) {
return ((uint32_t)(buf[0] & 0x7F) << 14) |
((uint32_t)(buf[1] & 0x7F) << 7) |
(uint32_t)(buf[2] & 0x7F);
}
/* parse an unsynchronized 32bits integer */
static inline uint32_t _X_BE_32_synchsafe(uint8_t buf[4]) {
return ((uint32_t)(buf[0] & 0x7F) << 21) |
((uint32_t)(buf[1] & 0x7F) << 14) |
((uint32_t)(buf[2] & 0x7F) << 7) |
(uint32_t)(buf[3] & 0x7F);
}
/* parse an unsynchronized 35bits integer */
static inline uint32_t BE_35_synchsafe(uint8_t buf[5]) {
return ((uint32_t)(buf[0] & 0x07) << 28) |
((uint32_t)(buf[1] & 0x7F) << 21) |
((uint32_t)(buf[2] & 0x7F) << 14) |
((uint32_t)(buf[3] & 0x7F) << 7) |
(uint32_t)(buf[4] & 0x7F);
}
#endif /* ID3_H */
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