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main.h
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main.h
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/******************************************************************************
* main.h
*
* mp3nema - MP3 analysis and data hiding utility
*
* Copyright (C) 2008 Matt Davis (enferex) of 757Labs (www.757labs.com)
*
* main.h is part of mp3nema.
* mp3nema 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 3 of the License, or
* (at your option) any later version.
*
* mp3nema 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 mp3nema. If not, see <http://www.gnu.org/licenses/>.
*****************************************************************************/
#ifndef MAIN_H_INCLUDE
#define MAIN_H_INCLUDE
/* Thanks to the wonderful resource found at:
* http://mpgedit.org/mpgedit/mpeg_format/mpeghdr.htm
*/
/* Terminal Display Name */
#define NAME "mp3nema"
#define TAG "[" NAME "]"
/* Version */
#define _VER(_major, _minor) #_major"."#_minor
#define VERSION _VER(0, 4) /* Major, Minor */
/* Main Argument Flags */
#define FLAG_INSERT_MODE 1
#define FLAG_CAPTURE_MODE 2
#define FLAG_EXTRACT_MODE 4
#define FLAG_VERBOSE 8
typedef unsigned short int flags_t;
extern flags_t main_flags;
/* Error Reporting */
#define ERR(...) {fprintf(stderr, TAG "Error: " __VA_ARGS__);}
/* Verbose */
#define IS_VERBOSE (main_flags & FLAG_VERBOSE)
#define VERBOSE(...) {if (IS_VERBOSE) {printf(__VA_ARGS__);}}
/* For array allocation */
#define DEFAULT_BLK_SZ 512 /* Bytes */
/* Out of Band data (OOB) what we are looking for */
#define OOB_BLK_SIZE DEFAULT_BLK_SZ
/* Number of initial mp3 frames to ignore when injecting mp3 with data */
#define FRAMES_TO_IGNORE 15
typedef struct _mp3_frame_t
{
unsigned char header[6]; /* 6 bytes 4 for header 2 for CRC if it exists */
int header_size;
int version;
int layer;
int crc;
int padding;
int bitrate;
int samplerate;
int audio_size; /* AKA frame length */
unsigned char *audio;
} mp3_frame_t;
/* What we have found in the mp3 */
typedef enum _stream_thang
{
STREAM_OBJECT_UNKNOWN, /* Error */
STREAM_OBJECT_MP3_FRAME,
STREAM_OBJECT_ID3V2_TAG
} STREAM_OBJECT;
/* MP3 Version */
#define MP3_HDR_VERSION(_h) ((_h[1] & 0x18) >> 3)
#define V1 0x3
#define V2 0x2
#define V2_5 0x0
/* MP3 Layer */
#define MP3_HDR_LAYER(_h) ((_h[1] & 0x06) >> 1)
#define L1 0x3
#define L2 0x2
#define L3 0x1
/* Other Header Fields */
#define MP3_HDR_CRC(_h) ((_h[1] & 0x01))
#define MP3_HDR_PADDING(_h) ((_h[2] & 0x02) >> 1)
#define MP3_HDR_BIT_RATE(_h) ((_h[2] & 0xF0) >> 4)
#define MP3_HDR_SAMPLE_RATE(_h) ((_h[2] & 0x0C) >> 2)
/* Bit Rate Table
*
* Row index: bitrate value from frame header
* Col index: Based on MP3 Version and Layer
*/
static const int bitrate_table[][5] = {
/* 0000 */ {0, 0, 0, 0, 0},
/* 0001 */ {32, 32, 32, 32, 8},
/* 0010 */ {64, 48, 40, 48, 16},
/* 0011 */ {96, 56, 48, 56, 24},
/* 0100 */ {128, 64, 56, 64, 32},
/* 0101 */ {160, 80, 64, 80, 40},
/* 0110 */ {192, 96, 80, 96, 48},
/* 0111 */ {224, 112, 96, 112, 56},
/* 1000 */ {256, 128, 112, 128, 64},
/* 1001 */ {288, 160, 128, 144, 80},
/* 1010 */ {320, 192, 160, 160, 96},
/* 1011 */ {352, 224, 192, 176, 112},
/* 1100 */ {384, 256, 224, 192, 128},
/* 1101 */ {416, 320, 256, 224, 144},
/* 1110 */ {448, 384, 320, 256, 160},
/* 1111 */ {-1, -1, -1, -1, -1},
};
/* Sample rate table
*
* Row: index from header
* Col: index from MP3 version
*/
static const int sample_rate_table[][3] = {
/* 00 */ {44100, 22050, 11025},
/* 01 */ {48000, 24000, 12000},
/* 10 */ {32000, 16000, 8000},
/* 11 */ {0, 0, 0}
};
/* ID3v2 Tag */
typedef struct _tag
{
int extended_header;
int footer;
unsigned int size;
} id3_tag_t;
#define ID3_HDR_EXTENDED(_h) ((_h[2] & 0x40) >> 4)
#define ID3_HDR_FOOTER(_h) ((_h[2] & 0x10) >> 4)
#define ID3_HDR_SIZE(_h) \
(((_h[6] << 23) | (_h[7] << 16)) | ((_h[8] << 7) | (_h[9])))
/*
* Routines
*/
/* Handle the fname as a directory or single mp3 file that data from 'datasrc'
* file is to be injected into
*/
extern void handle_as_insert(
const char *f_or_dir_name,
flags_t flags,
const char *datasrc);
/* Handle the name as a mp3 file */
extern void handle_as_file(const char *fname, flags_t flags);
/* Only scan the incoming data for OOB info */
extern void handle_as_stream(const char *url, flags_t flags);
#endif /* MAIN_H_INCLUDE */