apps/metadata/asap.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2008 Dominik Wenger
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License
  14  * as published by the Free Software Foundation; either version 2
  15  * of the License, or (at your option) any later version.
  16  *
  17  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  18  * KIND, either express or implied.
  19  *
  20  ****************************************************************************/
  21 #include <stdio.h>
  22 #include <string.h>
  23 #include <stdlib.h>
  24 #include <ctype.h>
  25 #include <inttypes.h>
  26
  27 #include "system.h"
  28 #include "metadata.h"
  29 #include "metadata_common.h"
  30 #include "metadata_parsers.h"
  31 #include "rbunicode.h"
  32 #include "debug.h"
  33
  34 #define MAX_SONGS  32
  35
  36 static bool parse_dec(int *retval, const char *p, int minval, int maxval)
  37 {
  38     int r = 0;
  39     do {
  40         char c = *p;
  41         if (c >= '0' && c <= '9')
  42             r = 10 * r + c - '0';
  43         else
  44             return false;
  45         if (r > maxval)
  46             return false;
  47     } while (*++p != '\0');
  48     if (r < minval)
  49         return false;
  50     *retval = r;
  51     return true;
  52 }
  53
  54 static bool parse_text(char *retval, const char *p)
  55 {
  56     int i;
  57     if (*p != '"')
  58         return false;
  59     p++;
  60     if (p[0] == '<' && p[1] == '?' && p[2] == '>' && p[3] == '"')
  61         return true;
  62     i = 0;
  63     while (*p != '"') {
  64         if (i >= 127)
  65             return false;
  66         if (*p == '\0')
  67             return false;
  68         retval[i++] = *p++;
  69     }
  70     retval[i] = '\0';
  71     return true;
  72 }
  73
  74 static int ASAP_ParseDuration(const char *s)
  75 {
  76     int r;
  77     if (*s < '0' || *s > '9')
  78         return -1;
  79     r = *s++ - '0';
  80     if (*s >= '0' && *s <= '9')
  81         r = 10 * r + *s++ - '0';
  82     if (*s == ':') {
  83         s++;
  84         if (*s < '0' || *s > '5')
  85             return -1;
  86         r = 60 * r + (*s++ - '0') * 10;
  87         if (*s < '0' || *s > '9')
  88             return -1;
  89         r += *s++ - '0';
  90     }
  91     r *= 1000;
  92     if (*s != '.')
  93         return r;
  94     s++;
  95     if (*s < '0' || *s > '9')
  96         return r;
  97     r += 100 * (*s++ - '0');
  98     if (*s < '0' || *s > '9')
  99         return r;
 100     r += 10 * (*s++ - '0');
 101     if (*s < '0' || *s > '9')
 102         return r;
 103     r += *s - '0';
 104     return r;
 105 }
 106
 107 static bool read_asap_string(char* source,char** buf,char** buffer_end,char** dest)
 108 {
 109     if(parse_text(*buf,source) == false) return false;
 110
 111     /* set dest pointer */
 112     *dest = *buf;
 113
 114     /* move buf ptr */
 115     *buf += strlen(*buf)+1;
 116
 117     /* check size */
 118     if(*buf >= *buffer_end)
 119     {
 120         DEBUGF("Buffer full\n");
 121         return false;
 122     }
 123     return true;
 124 }
 125
 126 static bool parse_sap_header(int fd,struct mp3entry* id3,int file_len)
 127 {
 128     int module_index = 0;
 129     int sap_signature = -1;
 130     int duration_index = 0;
 131     unsigned char cur_char = 0;
 132     int i;
 133
 134     /* set defaults */
 135     int numSongs=1;
 136     int defSong=0;
 137     int numChannels=1;
 138     int durations[MAX_SONGS];
 139     int loops[MAX_SONGS];
 140     for (i = 0; i < MAX_SONGS; i++) {
 141         durations[i] = -1;
 142         loops[i] = 0;
 143     }
 144
 145     /* use id3v2 buffer for our strings */
 146     char* buffer = id3->id3v2buf;
 147     char* buffer_end = id3->id3v2buf + ID3V2_BUF_SIZE;
 148
 149     /* parse file */
 150     while (1)
 151     {
 152         char line[256];
 153         char *p;
 154
 155         if (module_index + 8 >= file_len)
 156             return false;
 157         /* read a char */
 158         read(fd,&cur_char,1);
 159         /* end of header */
 160         if (cur_char == 0xff)
 161             break;
 162
 163         i = 0;
 164         while (cur_char != 0x0d)
 165         {
 166             line[i++] = cur_char;
 167             module_index++;
 168             if (module_index >= file_len || (unsigned)i >= sizeof(line) - 1)
 169                 return false;
 170             /* read a char */
 171             read(fd,&cur_char,1);
 172         }
 173         if (++module_index >= file_len )
 174             return false;
 175         /* read a char */
 176         read(fd,&cur_char,1);
 177         if ( cur_char != 0x0a)
 178             return false;
 179
 180         line[i] = '\0';
 181         for (p = line; *p != '\0'; p++) {
 182             if (*p == ' ') {
 183                 *p++ = '\0';
 184                 break;
 185             }
 186         }
 187
 188         /* parse tags */
 189         if(strcmp(line, "SAP") == 0)
 190             sap_signature = 1;
 191         if (sap_signature == -1)
 192             return false;
 193         if (strcmp(line,"AUTHOR") == 0)
 194         {
 195             if(read_asap_string(p,&buffer,&buffer_end,&id3->artist) == false)
 196                 return false;
 197         }
 198         else if(strcmp(line,"NAME")==0)
 199         {
 200             if(read_asap_string(p,&buffer,&buffer_end,&id3->title) == false)
 201                 return false;
 202         }
 203         else if(strcmp(line,"DATE")==0)
 204         {
 205             if(read_asap_string(p,&buffer,&buffer_end,&id3->year_string) == false)
 206                 return false;
 207         }
 208         else if (strcmp(line,"SONGS")==0)
 209         {
 210             if (parse_dec(&numSongs, p,1,MAX_SONGS) == false )
 211                 return false;
 212         }
 213         else if (strcmp(line,"DEFSONG")==0)
 214         {
 215             if (parse_dec(&defSong, p,0,MAX_SONGS) == false)
 216                 return false;
 217         }
 218         else if (strcmp(line,"STEREO")==0)
 219         {
 220             numChannels = 2;
 221         }
 222         else if (strcmp(line,"TIME") == 0)
 223         {
 224             int durationTemp = ASAP_ParseDuration(p);
 225             if (durationTemp < 0 || duration_index >= MAX_SONGS)
 226                 return false;
 227             durations[duration_index] = durationTemp;
 228             if (strstr(p, "LOOP") != NULL)
 229                 loops[duration_index] = 1;
 230             duration_index++;
 231         }
 232     }
 233
 234     /* set length: */
 235     int length =  durations[defSong];
 236     if (length < 0)
 237         length = 180 * 1000;
 238     id3->length = length;
 239
 240     lseek(fd,0,SEEK_SET);
 241     return true;
 242 }
 243
 244
 245 bool get_asap_metadata(int fd, struct mp3entry* id3)
 246 {
 247
 248     int filelength = filesize(fd);
 249
 250     if(parse_sap_header(fd,id3,filelength) == false)
 251     {
 252         DEBUGF("parse sap header failed.\n");
 253         return false;
 254     }
 255
 256     id3->bitrate = 706;
 257     id3->frequency = 44100;
 258
 259     id3->vbr = false;
 260     id3->filesize = filelength;
 261
 262     return true;
 263 }