mirror of
https://github.com/Shpoike/Quakespasm.git
synced 2024-11-14 00:50:38 +00:00
65825de11a
git-svn-id: svn://svn.code.sf.net/p/quakespasm/code/trunk/quakespasm@1665 af15c1b1-3010-417e-b628-4374ebc0bcbd
405 lines
14 KiB
C
405 lines
14 KiB
C
/* MP3 TAGS STUFF -- put together using public specs.
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* Copyright (C) 2018-2019 O. Sezer <sezero@users.sourceforge.net>
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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 (at
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* 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, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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*
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* See the 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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#include "quakedef.h"
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#if defined(USE_CODEC_MP3)
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#include "snd_codec.h"
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#include "q_ctype.h"
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static inline qboolean is_id3v1(const unsigned char *data, long length) {
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/* http://id3.org/ID3v1 : 3 bytes "TAG" identifier and 125 bytes tag data */
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if (length < 128 || memcmp(data,"TAG",3) != 0) {
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return false;
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}
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return true;
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}
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static qboolean is_id3v2(const unsigned char *data, size_t length) {
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/* ID3v2 header is 10 bytes: http://id3.org/id3v2.4.0-structure */
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/* bytes 0-2: "ID3" identifier */
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if (length < 10 || memcmp(data,"ID3",3) != 0) {
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return false;
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}
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/* bytes 3-4: version num (major,revision), each byte always less than 0xff. */
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if (data[3] == 0xff || data[4] == 0xff) {
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return false;
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}
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/* bytes 6-9 are the ID3v2 tag size: a 32 bit 'synchsafe' integer, i.e. the
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* highest bit 7 in each byte zeroed. i.e.: 7 bit information in each byte ->
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* effectively a 28 bit value. */
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if (data[6] >= 0x80 || data[7] >= 0x80 || data[8] >= 0x80 || data[9] >= 0x80) {
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return false;
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}
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return true;
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}
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static long get_id3v2_len(const unsigned char *data, long length) {
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/* size is a 'synchsafe' integer (see above) */
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long size = (long)((data[6]<<21) + (data[7]<<14) + (data[8]<<7) + data[9]);
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size += 10; /* header size */
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/* ID3v2 header[5] is flags (bits 4-7 only, 0-3 are zero).
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* bit 4 set: footer is present (a copy of the header but
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* with "3DI" as ident.) */
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if (data[5] & 0x10) {
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size += 10; /* footer size */
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}
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/* optional padding (always zeroes) */
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while (size < length && data[size] == 0) {
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++size;
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}
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return size;
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}
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static qboolean is_apetag(const unsigned char *data, size_t length) {
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/* http://wiki.hydrogenaud.io/index.php?title=APEv2_specification
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* Header/footer is 32 bytes: bytes 0-7 ident, bytes 8-11 version,
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* bytes 12-17 size. bytes 24-31 are reserved: must be all zeroes. */
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unsigned int v;
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if (length < 32 || memcmp(data,"APETAGEX",8) != 0) {
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return false;
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}
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v = (unsigned)((data[11]<<24) | (data[10]<<16) | (data[9]<<8) | data[8]); /* version */
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if (v != 2000U && v != 1000U) {
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return false;
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}
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v = 0; /* reserved bits : */
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if (memcmp(&data[24],&v,4) != 0 || memcmp(&data[28],&v,4) != 0) {
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return false;
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}
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return true;
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}
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static long get_ape_len(const unsigned char *data) {
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unsigned int flags, version;
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long size = (long)((data[15]<<24) | (data[14]<<16) | (data[13]<<8) | data[12]);
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version = (unsigned)((data[11]<<24) | (data[10]<<16) | (data[9]<<8) | data[8]);
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flags = (unsigned)((data[23]<<24) | (data[22]<<16) | (data[21]<<8) | data[20]);
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if (version == 2000U && (flags & (1U<<31))) size += 32; /* header present. */
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return size;
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}
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static inline int is_lyrics3tag(const unsigned char *data, long length) {
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/* http://id3.org/Lyrics3
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* http://id3.org/Lyrics3v2 */
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if (length < 15) return 0;
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if (memcmp(data+6,"LYRICS200",9) == 0) return 2; /* v2 */
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if (memcmp(data+6,"LYRICSEND",9) == 0) return 1; /* v1 */
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return 0;
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}
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static long get_lyrics3v1_len(snd_stream_t *stream) {
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const char *p; long i, len;
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char buf[5104];
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/* needs manual search: http://id3.org/Lyrics3 */
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if (stream->fh.length < 20) return -1;
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len = (stream->fh.length > 5109)? 5109 : stream->fh.length;
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FS_fseek(&stream->fh, -len, SEEK_END);
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FS_fread(buf, 1, (len -= 9), &stream->fh); /* exclude footer */
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/* strstr() won't work here. */
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for (i = len - 11, p = buf; i >= 0; --i, ++p) {
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if (memcmp(p, "LYRICSBEGIN", 11) == 0)
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break;
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}
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if (i < 0) return -1;
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return len - (long)(p - buf) + 9 /* footer */;
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}
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static inline long get_lyrics3v2_len(const unsigned char *data, long length) {
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/* 6 bytes before the end marker is size in decimal format -
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* does not include the 9 bytes end marker and size field. */
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if (length != 6) return 0;
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return strtol((const char *)data, NULL, 10) + 15;
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}
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static inline qboolean verify_lyrics3v2(const unsigned char *data, long length) {
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if (length < 11) return false;
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if (memcmp(data,"LYRICSBEGIN",11) == 0) return true;
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return false;
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}
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#define MMTAG_PARANOID
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static qboolean is_musicmatch(const unsigned char *data, long length) {
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/* From docs/musicmatch.txt in id3lib: https://sourceforge.net/projects/id3lib/
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Overall tag structure:
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+-----------------------------+
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| Header |
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| (256 bytes, OPTIONAL) |
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+-----------------------------+
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| Image extension (4 bytes) |
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+-----------------------------+
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| Image binary |
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| (var. length >= 4 bytes) |
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+-----------------------------+
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| Unused (4 bytes) |
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+-----------------------------+
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| Version info (256 bytes) |
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+-----------------------------+
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| Audio meta-data |
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| (var. length >= 7868 bytes) |
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+-----------------------------+
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| Data offsets (20 bytes) |
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+-----------------------------+
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| Footer (48 bytes) |
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+-----------------------------+
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*/
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if (length < 48) return false;
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/* sig: 19 bytes company name + 13 bytes space */
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if (memcmp(data,"Brava Software Inc. ",32) != 0) {
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return false;
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}
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/* 4 bytes version: x.xx */
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if (!q_isdigit(data[32]) || data[33] != '.' ||
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!q_isdigit(data[34]) ||!q_isdigit(data[35])) {
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return false;
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}
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#ifdef MMTAG_PARANOID
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/* [36..47]: 12 bytes trailing space */
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for (length = 36; length < 48; ++length) {
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if (data[length] != ' ') return false;
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}
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#endif
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return true;
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}
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static long get_musicmatch_len(snd_stream_t *stream) {
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const int metasizes[4] = { 7868, 7936, 8004, 8132 };
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const unsigned char syncstr[10] = {'1','8','2','7','3','6','4','5',0,0};
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unsigned char buf[256];
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int i, j, imgext_ofs, version_ofs;
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long len;
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FS_fseek(&stream->fh, -68, SEEK_END);
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FS_fread(buf, 1, 20, &stream->fh);
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imgext_ofs = (int)((buf[3] <<24) | (buf[2] <<16) | (buf[1] <<8) | buf[0] );
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version_ofs = (int)((buf[15]<<24) | (buf[14]<<16) | (buf[13]<<8) | buf[12]);
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if (version_ofs <= imgext_ofs) return -1;
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if (version_ofs <= 0 || imgext_ofs <= 0) return -1;
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/* Try finding the version info section:
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* Because metadata section comes after it, and because metadata section
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* has different sizes across versions (format ver. <= 3.00: always 7868
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* bytes), we can _not_ directly calculate using deltas from the offsets
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* section. */
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for (i = 0; i < 4; ++i) {
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/* 48: footer, 20: offsets, 256: version info */
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len = metasizes[i] + 48 + 20 + 256;
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if (stream->fh.length < len) return -1;
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FS_fseek(&stream->fh, -len, SEEK_END);
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FS_fread(buf, 1, 256, &stream->fh);
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/* [0..9]: sync string, [30..255]: 0x20 */
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#ifdef MMTAG_PARANOID
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for (j = 30; j < 256; ++j) {
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if (buf[j] != ' ') break;
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}
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if (j < 256) continue;
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#endif
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if (memcmp(buf, syncstr, 10) == 0) {
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break;
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}
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}
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if (i == 4) return -1; /* no luck. */
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#ifdef MMTAG_PARANOID
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/* unused section: (4 bytes of 0x00) */
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FS_fseek(&stream->fh, -(len + 4), SEEK_END);
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FS_fread(buf, 1, 4, &stream->fh); j = 0;
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if (memcmp(buf, &j, 4) != 0) return -1;
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#endif
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len += (version_ofs - imgext_ofs);
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if (stream->fh.length < len) return -1;
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FS_fseek(&stream->fh, -len, SEEK_END);
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FS_fread(buf, 1, 8, &stream->fh);
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j = (int)((buf[7] <<24) | (buf[6] <<16) | (buf[5] <<8) | buf[4]);
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if (j < 0) return -1;
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/* verify image size: */
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/* without this, we may land at a wrong place. */
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if (j + 12 != version_ofs - imgext_ofs) return -1;
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/* try finding the optional header */
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if (stream->fh.length < len + 256) return len;
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FS_fseek(&stream->fh, -(len + 256), SEEK_END);
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FS_fread(buf, 1, 256, &stream->fh);
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/* [0..9]: sync string, [30..255]: 0x20 */
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if (memcmp(buf, syncstr, 10) != 0) {
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return len;
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}
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#ifdef MMTAG_PARANOID
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for (j = 30; j < 256; ++j) {
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if (buf[j] != ' ') return len;
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}
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#endif
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return len + 256; /* header is present. */
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}
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static int probe_id3v1(snd_stream_t *stream, unsigned char *buf, int atend) {
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if (stream->fh.length >= 128) {
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FS_fseek(&stream->fh, -128, SEEK_END);
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if (FS_fread(buf, 1, 128, &stream->fh) != 128)
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return -1;
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if (is_id3v1(buf, 128)) {
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if (!atend) { /* possible false positive? */
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if (is_musicmatch(buf + 128 - 48, 48) ||
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is_apetag (buf + 128 - 32, 32) ||
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is_lyrics3tag(buf + 128 - 15, 15)) {
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return 0;
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}
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}
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stream->fh.length -= 128;
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Con_DPrintf("MP3: skipped %ld bytes ID3v1 tag\n", 128L);
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return 1;
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/* FIXME: handle possible double-ID3v1 tags? */
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}
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}
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return 0;
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}
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static int probe_mmtag(snd_stream_t *stream, unsigned char *buf) {
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long len;
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if (stream->fh.length >= 68) {
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FS_fseek(&stream->fh, -48, SEEK_END);
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if (FS_fread(buf, 1, 48, &stream->fh) != 48)
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return -1;
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if (is_musicmatch(buf, 48)) {
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len = get_musicmatch_len(stream);
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if (len < 0) return -1;
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if (len >= stream->fh.length) return -1;
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stream->fh.length -= len;
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Con_DPrintf("MP3: skipped %ld bytes MusicMatch tag\n", len);
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return 1;
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}
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}
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return 0;
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}
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static int probe_apetag(snd_stream_t *stream, unsigned char *buf) {
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long len;
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if (stream->fh.length >= 32) {
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FS_fseek(&stream->fh, -32, SEEK_END);
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if (FS_fread(buf, 1, 32, &stream->fh) != 32)
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return -1;
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if (is_apetag(buf, 32)) {
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len = get_ape_len(buf);
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if (len >= stream->fh.length) return -1;
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stream->fh.length -= len;
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Con_DPrintf("MP3: skipped %ld bytes APE tag\n", len);
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return 1;
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}
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}
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return 0;
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}
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static int probe_lyrics3(snd_stream_t *stream, unsigned char *buf) {
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long len;
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if (stream->fh.length >= 15) {
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FS_fseek(&stream->fh, -15, SEEK_END);
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if (FS_fread(buf, 1, 15, &stream->fh) != 15)
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return -1;
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len = is_lyrics3tag(buf, 15);
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if (len == 2) {
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len = get_lyrics3v2_len(buf, 6);
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if (len >= stream->fh.length) return -1;
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if (len < 15) return -1;
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FS_fseek(&stream->fh, -len, SEEK_END);
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if (FS_fread(buf, 1, 11, &stream->fh) != 11)
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return -1;
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if (!verify_lyrics3v2(buf, 11)) return -1;
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stream->fh.length -= len;
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Con_DPrintf("MP3: skipped %ld bytes Lyrics3 tag\n", len);
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return 1;
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}
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else if (len == 1) {
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len = get_lyrics3v1_len(stream);
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if (len < 0) return -1;
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stream->fh.length -= len;
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Con_DPrintf("MP3: skipped %ld bytes Lyrics3 tag\n", len);
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return 1;
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}
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}
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return 0;
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}
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int mp3_skiptags(snd_stream_t *stream)
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{
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unsigned char buf[128];
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long len; size_t readsize;
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int c_id3, c_ape, c_lyr, c_mm;
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int rc = -1;
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/* failsafe */
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long oldlength = stream->fh.length;
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long oldstart = stream->fh.start;
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/* MP3 standard has no metadata format, so everyone invented
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* their own thing, even with extensions, until ID3v2 became
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* dominant: Hence the impossible mess here.
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*
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* Note: I don't yet care about freaky broken mp3 files with
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* double tags. -- O.S.
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*/
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readsize = FS_fread(buf, 1, 128, &stream->fh);
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if (!readsize || FS_ferror(&stream->fh)) goto fail;
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/* ID3v2 tag is at the start */
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if (is_id3v2(buf, readsize)) {
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len = get_id3v2_len(buf, (long)readsize);
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if (len >= stream->fh.length) goto fail;
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stream->fh.start += len;
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stream->fh.length -= len;
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Con_DPrintf("MP3: skipped %ld bytes ID3v2 tag\n", len);
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}
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/* APE tag _might_ be at the start (discouraged
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* but not forbidden, either.) read the header. */
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else if (is_apetag(buf, readsize)) {
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len = get_ape_len(buf);
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if (len >= stream->fh.length) goto fail;
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stream->fh.start += len;
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stream->fh.length -= len;
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Con_DPrintf("MP3: skipped %ld bytes APE tag\n", len);
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}
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/* it's not impossible that _old_ MusicMatch tag
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* placing itself after ID3v1. */
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if ((c_mm = probe_mmtag(stream, buf)) < 0) {
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goto fail;
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}
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/* ID3v1 tag is at the end */
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if ((c_id3 = probe_id3v1(stream, buf, !c_mm)) < 0) {
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goto fail;
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}
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/* we do not know the order of ape or lyrics3
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* or musicmatch tags, hence the loop here.. */
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c_ape = 0;
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c_lyr = 0;
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for (;;) {
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if (!c_lyr) {
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/* care about mp3s with double Lyrics3 tags? */
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if ((c_lyr = probe_lyrics3(stream, buf)) < 0)
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goto fail;
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if (c_lyr) continue;
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}
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if (!c_mm) {
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if ((c_mm = probe_mmtag(stream, buf)) < 0)
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goto fail;
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if (c_mm) continue;
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}
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if (!c_ape) {
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if ((c_ape = probe_apetag(stream, buf)) < 0)
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goto fail;
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if (c_ape) continue;
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}
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break;
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} /* for (;;) */
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rc = (stream->fh.length > 0)? 0 : -1;
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fail:
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if (rc < 0) {
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stream->fh.start = oldstart;
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stream->fh.length = oldlength;
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}
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FS_rewind(&stream->fh);
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return rc;
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}
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#endif /* USE_CODEC_MP3 */
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