owntone-server/src/scan-wma.c

/*
 * $Id$
 * WMA metatag parsing
 *
 * Copyright (C) 2005 Ron Pedde (ron@pedde.com)
 *
 * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#ifdef HAVE_CONFIG_H
#  include "config.h"
#endif

#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>


#include "mp3-scanner.h"
#include "restart.h"
#include "err.h"

typedef struct tag_wma_guidlist {
    char *name;
    char *guid;
    char value[16];
} WMA_GUID;

WMA_GUID wma_guidlist[] = {
    { "ASF_Index_Object",
      "D6E229D3-35DA-11D1-9034-00A0C90349BE",
      "\xD3\x29\xE2\xD6\xDA\x35\xD1\x11\x90\x34\x00\xA0\xC9\x03\x49\xBE" },
    { "ASF_Extended_Stream_Properties_Object",
      "14E6A5CB-C672-4332-8399-A96952065B5A",
      "\xCB\xA5\xE6\x14\x72\xC6\x32\x43\x83\x99\xA9\x69\x52\x06\x5B\x5A" },
    { "ASF_Payload_Ext_Syst_Pixel_Aspect_Ratio",
      "1B1EE554-F9EA-4BC8-821A-376B74E4C4B8",
      "\x54\xE5\x1E\x1B\xEA\xF9\xC8\x4B\x82\x1A\x37\x6B\x74\xE4\xC4\xB8" },
    { "ASF_Bandwidth_Sharing_Object",
      "A69609E6-517B-11D2-B6AF-00C04FD908E9",
      "\xE6\x09\x96\xA6\x7B\x51\xD2\x11\xB6\xAF\x00\xC0\x4F\xD9\x08\xE9" },
    { "ASF_Payload_Extension_System_Timecode",
      "399595EC-8667-4E2D-8FDB-98814CE76C1E",
      "\xEC\x95\x95\x39\x67\x86\x2D\x4E\x8F\xDB\x98\x81\x4C\xE7\x6C\x1E" },
    { "ASF_Marker_Object",
      "F487CD01-A951-11CF-8EE6-00C00C205365",
      "\x01\xCD\x87\xF4\x51\xA9\xCF\x11\x8E\xE6\x00\xC0\x0C\x20\x53\x65" },
    { "ASF_Data_Object",
      "75B22636-668E-11CF-A6D9-00AA0062CE6C",
      "\x36\x26\xB2\x75\x8E\x66\xCF\x11\xA6\xD9\x00\xAA\x00\x62\xCE\x6C" },
    { "ASF_Content_Description_Object",
      "75B22633-668E-11CF-A6D9-00AA0062CE6C",
      "\x33\x26\xB2\x75\x8E\x66\xCF\x11\xA6\xD9\x00\xAA\x00\x62\xCE\x6C" },
    { "ASF_Reserved_1",
      "ABD3D211-A9BA-11cf-8EE6-00C00C205365",
      "\x11\xD2\xD3\xAB\xBA\xA9\xcf\x11\x8E\xE6\x00\xC0\x0C\x20\x53\x65" },
    { "ASF_Timecode_Index_Object",
      "3CB73FD0-0C4A-4803-953D-EDF7B6228F0C",
      "\xD0\x3F\xB7\x3C\x4A\x0C\x03\x48\x95\x3D\xED\xF7\xB6\x22\x8F\x0C" },
    { "ASF_Language_List_Object",
      "7C4346A9-EFE0-4BFC-B229-393EDE415C85",
      "\xA9\x46\x43\x7C\xE0\xEF\xFC\x4B\xB2\x29\x39\x3E\xDE\x41\x5C\x85" },
    { "ASF_No_Error_Correction",
      "20FB5700-5B55-11CF-A8FD-00805F5C442B",
      "\x00\x57\xFB\x20\x55\x5B\xCF\x11\xA8\xFD\x00\x80\x5F\x5C\x44\x2B" },
    { "ASF_Extended_Content_Description_Object",
      "D2D0A440-E307-11D2-97F0-00A0C95EA850",
      "\x40\xA4\xD0\xD2\x07\xE3\xD2\x11\x97\xF0\x00\xA0\xC9\x5E\xA8\x50" },
    { "ASF_Media_Object_Index_Parameters_Obj",
      "6B203BAD-3F11-4E84-ACA8-D7613DE2CFA7",
      "\xAD\x3B\x20\x6B\x11\x3F\x84\x4E\xAC\xA8\xD7\x61\x3D\xE2\xCF\xA7" },
    { "ASF_Codec_List_Object",
      "86D15240-311D-11D0-A3A4-00A0C90348F6",
      "\x40\x52\xD1\x86\x1D\x31\xD0\x11\xA3\xA4\x00\xA0\xC9\x03\x48\xF6" },
    { "ASF_Stream_Bitrate_Properties_Object",
      "7BF875CE-468D-11D1-8D82-006097C9A2B2",
      "\xCE\x75\xF8\x7B\x8D\x46\xD1\x11\x8D\x82\x00\x60\x97\xC9\xA2\xB2" },
    { "ASF_Script_Command_Object",
      "1EFB1A30-0B62-11D0-A39B-00A0C90348F6",
      "\x30\x1A\xFB\x1E\x62\x0B\xD0\x11\xA3\x9B\x00\xA0\xC9\x03\x48\xF6" },
    { "ASF_Degradable_JPEG_Media",
      "35907DE0-E415-11CF-A917-00805F5C442B",
      "\xE0\x7D\x90\x35\x15\xE4\xCF\x11\xA9\x17\x00\x80\x5F\x5C\x44\x2B" },
    { "ASF_Header_Object",
      "75B22630-668E-11CF-A6D9-00AA0062CE6C",
      "\x30\x26\xB2\x75\x8E\x66\xCF\x11\xA6\xD9\x00\xAA\x00\x62\xCE\x6C" },
    { "ASF_Padding_Object",
      "1806D474-CADF-4509-A4BA-9AABCB96AAE8",
      "\x74\xD4\x06\x18\xDF\xCA\x09\x45\xA4\xBA\x9A\xAB\xCB\x96\xAA\xE8" },
    { "ASF_JFIF_Media",
      "B61BE100-5B4E-11CF-A8FD-00805F5C442B",
      "\x00\xE1\x1B\xB6\x4E\x5B\xCF\x11\xA8\xFD\x00\x80\x5F\x5C\x44\x2B" },
    { "ASF_Digital_Signature_Object",
      "2211B3FC-BD23-11D2-B4B7-00A0C955FC6E",
      "\xFC\xB3\x11\x22\x23\xBD\xD2\x11\xB4\xB7\x00\xA0\xC9\x55\xFC\x6E" },
    { "ASF_Metadata_Library_Object",
      "44231C94-9498-49D1-A141-1D134E457054",
      "\x94\x1C\x23\x44\x98\x94\xD1\x49\xA1\x41\x1D\x13\x4E\x45\x70\x54" },
    { "ASF_Payload_Ext_System_File_Name",
      "E165EC0E-19ED-45D7-B4A7-25CBD1E28E9B",
      "\x0E\xEC\x65\xE1\xED\x19\xD7\x45\xB4\xA7\x25\xCB\xD1\xE2\x8E\x9B" },
    { "ASF_Stream_Prioritization_Object",
      "D4FED15B-88D3-454F-81F0-ED5C45999E24",
      "\x5B\xD1\xFE\xD4\xD3\x88\x4F\x45\x81\xF0\xED\x5C\x45\x99\x9E\x24" },
    { "ASF_Bandwidth_Sharing_Exclusive",
      "AF6060AA-5197-11D2-B6AF-00C04FD908E9",
      "\xAA\x60\x60\xAF\x97\x51\xD2\x11\xB6\xAF\x00\xC0\x4F\xD9\x08\xE9" },
    { "ASF_Group_Mutual_Exclusion_Object",
      "D1465A40-5A79-4338-B71B-E36B8FD6C249",
      "\x40\x5A\x46\xD1\x79\x5A\x38\x43\xB7\x1B\xE3\x6B\x8F\xD6\xC2\x49" },
    { "ASF_Audio_Spread",
      "BFC3CD50-618F-11CF-8BB2-00AA00B4E220",
      "\x50\xCD\xC3\xBF\x8F\x61\xCF\x11\x8B\xB2\x00\xAA\x00\xB4\xE2\x20" },
    { "ASF_Advanced_Mutual_Exclusion_Object",
      "A08649CF-4775-4670-8A16-6E35357566CD",
      "\xCF\x49\x86\xA0\x75\x47\x70\x46\x8A\x16\x6E\x35\x35\x75\x66\xCD" },
    { "ASF_Payload_Ext_Syst_Sample_Duration",
      "C6BD9450-867F-4907-83A3-C77921B733AD",
      "\x50\x94\xBD\xC6\x7F\x86\x07\x49\x83\xA3\xC7\x79\x21\xB7\x33\xAD" },
    { "ASF_Stream_Properties_Object",
      "B7DC0791-A9B7-11CF-8EE6-00C00C205365",
      "\x91\x07\xDC\xB7\xB7\xA9\xCF\x11\x8E\xE6\x00\xC0\x0C\x20\x53\x65" },
    { "ASF_Metadata_Object",
      "C5F8CBEA-5BAF-4877-8467-AA8C44FA4CCA",
      "\xEA\xCB\xF8\xC5\xAF\x5B\x77\x48\x84\x67\xAA\x8C\x44\xFA\x4C\xCA" },
    { "ASF_Mutex_Unknown",
      "D6E22A02-35DA-11D1-9034-00A0C90349BE",
      "\x02\x2A\xE2\xD6\xDA\x35\xD1\x11\x90\x34\x00\xA0\xC9\x03\x49\xBE" },
    { "ASF_Content_Branding_Object",
      "2211B3FA-BD23-11D2-B4B7-00A0C955FC6E",
      "\xFA\xB3\x11\x22\x23\xBD\xD2\x11\xB4\xB7\x00\xA0\xC9\x55\xFC\x6E" },
    { "ASF_Content_Encryption_Object",
      "2211B3FB-BD23-11D2-B4B7-00A0C955FC6E",
      "\xFB\xB3\x11\x22\x23\xBD\xD2\x11\xB4\xB7\x00\xA0\xC9\x55\xFC\x6E" },
    { "ASF_Index_Parameters_Object",
      "D6E229DF-35DA-11D1-9034-00A0C90349BE",
      "\xDF\x29\xE2\xD6\xDA\x35\xD1\x11\x90\x34\x00\xA0\xC9\x03\x49\xBE" },
    { "ASF_Payload_Ext_System_Content_Type",
      "D590DC20-07BC-436C-9CF7-F3BBFBF1A4DC",
      "\x20\xDC\x90\xD5\xBC\x07\x6C\x43\x9C\xF7\xF3\xBB\xFB\xF1\xA4\xDC" },
    { "ASF_Web_Stream_Media_Subtype",
      "776257D4-C627-41CB-8F81-7AC7FF1C40CC",
      "\xD4\x57\x62\x77\x27\xC6\xCB\x41\x8F\x81\x7A\xC7\xFF\x1C\x40\xCC" },
    { "ASF_Web_Stream_Format",
      "DA1E6B13-8359-4050-B398-388E965BF00C",
      "\x13\x6B\x1E\xDA\x59\x83\x50\x40\xB3\x98\x38\x8E\x96\x5B\xF0\x0C" },
    { "ASF_Simple_Index_Object",
      "33000890-E5B1-11CF-89F4-00A0C90349CB",
      "\x90\x08\x00\x33\xB1\xE5\xCF\x11\x89\xF4\x00\xA0\xC9\x03\x49\xCB" },
    { "ASF_Error_Correction_Object",
      "75B22635-668E-11CF-A6D9-00AA0062CE6C",
      "\x35\x26\xB2\x75\x8E\x66\xCF\x11\xA6\xD9\x00\xAA\x00\x62\xCE\x6C" },
    { "ASF_Media_Object_Index_Object",
      "FEB103F8-12AD-4C64-840F-2A1D2F7AD48C",
      "\xF8\x03\xB1\xFE\xAD\x12\x64\x4C\x84\x0F\x2A\x1D\x2F\x7A\xD4\x8C" },
    { "ASF_Mutex_Language",
      "D6E22A00-35DA-11D1-9034-00A0C90349BE",
      "\x00\x2A\xE2\xD6\xDA\x35\xD1\x11\x90\x34\x00\xA0\xC9\x03\x49\xBE" },
    { "ASF_File_Transfer_Media",
      "91BD222C-F21C-497A-8B6D-5AA86BFC0185",
      "\x2C\x22\xBD\x91\x1C\xF2\x7A\x49\x8B\x6D\x5A\xA8\x6B\xFC\x01\x85" },
    { "ASF_Reserved_3",
      "4B1ACBE3-100B-11D0-A39B-00A0C90348F6",
      "\xE3\xCB\x1A\x4B\x0B\x10\xD0\x11\xA3\x9B\x00\xA0\xC9\x03\x48\xF6" },
    { "ASF_Bitrate_Mutual_Exclusion_Object",
      "D6E229DC-35DA-11D1-9034-00A0C90349BE",
      "\xDC\x29\xE2\xD6\xDA\x35\xD1\x11\x90\x34\x00\xA0\xC9\x03\x49\xBE" },
    { "ASF_Bandwidth_Sharing_Partial",
      "AF6060AB-5197-11D2-B6AF-00C04FD908E9",
      "\xAB\x60\x60\xAF\x97\x51\xD2\x11\xB6\xAF\x00\xC0\x4F\xD9\x08\xE9" },
    { "ASF_Command_Media",
      "59DACFC0-59E6-11D0-A3AC-00A0C90348F6",
      "\xC0\xCF\xDA\x59\xE6\x59\xD0\x11\xA3\xAC\x00\xA0\xC9\x03\x48\xF6" },
    { "ASF_Audio_Media",
      "F8699E40-5B4D-11CF-A8FD-00805F5C442B",
      "\x40\x9E\x69\xF8\x4D\x5B\xCF\x11\xA8\xFD\x00\x80\x5F\x5C\x44\x2B" },
    { "ASF_Reserved_2",
      "86D15241-311D-11D0-A3A4-00A0C90348F6",
      "\x41\x52\xD1\x86\x1D\x31\xD0\x11\xA3\xA4\x00\xA0\xC9\x03\x48\xF6" },
    { "ASF_Binary_Media",
      "3AFB65E2-47EF-40F2-AC2C-70A90D71D343",
      "\xE2\x65\xFB\x3A\xEF\x47\xF2\x40\xAC\x2C\x70\xA9\x0D\x71\xD3\x43" },
    { "ASF_Mutex_Bitrate",
      "D6E22A01-35DA-11D1-9034-00A0C90349BE",
      "\x01\x2A\xE2\xD6\xDA\x35\xD1\x11\x90\x34\x00\xA0\xC9\x03\x49\xBE" },
    { "ASF_Reserved_4",
      "4CFEDB20-75F6-11CF-9C0F-00A0C90349CB",
      "\x20\xDB\xFE\x4C\xF6\x75\xCF\x11\x9C\x0F\x00\xA0\xC9\x03\x49\xCB" },
    { "ASF_Alt_Extended_Content_Encryption_Obj",
      "FF889EF1-ADEE-40DA-9E71-98704BB928CE",
      "\xF1\x9E\x88\xFF\xEE\xAD\xDA\x40\x9E\x71\x98\x70\x4B\xB9\x28\xCE" },
    { "ASF_Timecode_Index_Parameters_Object",
      "F55E496D-9797-4B5D-8C8B-604DFE9BFB24",
      "\x6D\x49\x5E\xF5\x97\x97\x5D\x4B\x8C\x8B\x60\x4D\xFE\x9B\xFB\x24" },
    { "ASF_Header_Extension_Object",
      "5FBF03B5-A92E-11CF-8EE3-00C00C205365",
      "\xB5\x03\xBF\x5F\x2E\xA9\xCF\x11\x8E\xE3\x00\xC0\x0C\x20\x53\x65" },
    { "ASF_Video_Media",
      "BC19EFC0-5B4D-11CF-A8FD-00805F5C442B",
      "\xC0\xEF\x19\xBC\x4D\x5B\xCF\x11\xA8\xFD\x00\x80\x5F\x5C\x44\x2B" },
    { "ASF_Extended_Content_Encryption_Object",
      "298AE614-2622-4C17-B935-DAE07EE9289C",
      "\x14\xE6\x8A\x29\x22\x26\x17\x4C\xB9\x35\xDA\xE0\x7E\xE9\x28\x9C" },
    { "ASF_File_Properties_Object",
      "8CABDCA1-A947-11CF-8EE4-00C00C205365",
      "\xA1\xDC\xAB\x8C\x47\xA9\xCF\x11\x8E\xE4\x00\xC0\x0C\x20\x53\x65" },
    { NULL, NULL, "\x0\x0\x0\x0\x0\x0\x0\x0\x0\x0\x0\x0\x0\x0\x0\x0" }
};

#if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ > 4)
# define _PACKED __attribute((packed))
#else
# define _PACKED
#endif
#define MAYBEFREE(x) { free((x)); }

#pragma pack(1)
typedef struct tag_wma_header {
    unsigned char objectid[16];
    unsigned long long size;
    unsigned int objects;
    char reserved1;
    char reserved2;
} _PACKED WMA_HEADER;
                          
                          
typedef struct tag_wma_subheader {
    unsigned char objectid[16];
    long long size;
} _PACKED WMA_SUBHEADER;
#pragma pack()

/*
 * Forwards
 */ 
WMA_GUID *wma_find_guid(unsigned char *guid);
unsigned short int wma_convert_short(unsigned char *src);
unsigned int wma_convert_int(unsigned char *src);
unsigned long long wma_convert_ll(unsigned char *src);
char *wma_utf16toutf8(unsigned char *utf16, int len);
int wma_parse_content_description(int fd,int size, MP3FILE *pmp3);
int wma_parse_extended_content_description(int fd,int size, MP3FILE *pmp3);
int wma_parse_file_properteis(int fd,int size, MP3FILE *pmp3);


/**
 * read an unsigned short int from the fd
 */
int wma_file_read_short(int fd, unsigned short int *psi) {
    if(r_read(fd,(void*)psi,sizeof(unsigned short int)) != sizeof(unsigned short int)) {
        return 0;
    }

    *psi = wma_convert_short((unsigned char *)psi);
    return 1;
}

/**
 * read an unsigned int from the fd
 */
int wma_file_read_int(int fd, unsigned int *pi) {
    if(r_read(fd,(void*)pi,sizeof(unsigned int)) != sizeof(unsigned int)) {
        return 0;
    }

    *pi = wma_convert_int((unsigned char *)pi);
    return 1;
}

/**
 * read an ll from the fd
 */
int wma_file_read_ll(int fd, unsigned long long *pll) {
    if(r_read(fd,(void*)pll,sizeof(unsigned long long)) != sizeof(unsigned long long)) {
        return 0;
    }

    *pll = wma_convert_ll((unsigned char *)pll);
    return 1;
}

/**
 * read a utf-16le string as a utf8
 */
int wma_file_read_utf16(int fd, int len, char **utf8) {
    char *out;
    unsigned char *utf16;

    utf16=(unsigned char*)malloc(len);
    if(!utf16)
        return 0;

    if(r_read(fd,utf16,len) != len) 
        return 0;

    out = wma_utf16toutf8(utf16,len);
    *utf8 = out;
    free(utf16);

    return 1;
}

int wma_file_read_bytes(int fd,int len, unsigned char **data) {
    *data = (unsigned char *)malloc(len);
    if(!*data)
        return 0;

    if(r_read(fd,*data,len) != len)
        return 0;

    return 1;
}

/**
 * parse the extended content description object.  this is an object that
 * has ad-hoc tags, basically.
 *
 * @param fd fd of the file we are reading from -- positioned at start
 * @param size size of the content description block
 * @param pmp3 the mp3 struct we are filling with gleaned data
 */
int wma_parse_extended_content_description(int fd,int size, MP3FILE *pmp3) {
    unsigned short descriptor_count;
    int index;
    unsigned short descriptor_name_len;
    char *descriptor_name;
    unsigned short descriptor_value_type;
    unsigned short descriptor_value_len;

    char *descriptor_byte_value=NULL;
    unsigned int descriptor_int_value; /* bool and dword */
    unsigned long long descriptor_ll_value;
    unsigned short int descriptor_short_value;
    int fail=0;
    int track, tracknumber;
    char numbuff[40];

    track = tracknumber = 0;

    DPRINTF(E_DBG,L_SCAN,"Reading extended content description object\n");

    if(!wma_file_read_short(fd, &descriptor_count))
        return FALSE;

    for(index = 0; index < descriptor_count; index++) {
        if(!wma_file_read_short(fd,&descriptor_name_len)) return -1;
        if(!wma_file_read_utf16(fd,descriptor_name_len,&descriptor_name)) return -1;
        if(!wma_file_read_short(fd,&descriptor_value_type)) { 
            free(descriptor_name);
            return FALSE;
        }
        if(!wma_file_read_short(fd,&descriptor_value_len)) {
            free(descriptor_name);
            return FALSE;
        }

        DPRINTF(E_DBG,L_SCAN,"Found descriptor: %s\n", descriptor_name);

        /* see what kind it is */
        switch(descriptor_value_type) {
        case 0x0000: /* string */
            if(!wma_file_read_utf16(fd,descriptor_value_len,
                                    &descriptor_byte_value)) {
                fail=1;
            }
            descriptor_int_value=atoi(descriptor_byte_value);
            DPRINTF(E_DBG,L_SCAN,"Type: string, value: %s\n",descriptor_byte_value);
            break;
        case 0x0001: /* byte array */
            if(!wma_file_read_bytes(fd,descriptor_value_len,
                                    (unsigned char **)&descriptor_byte_value)){
                fail=1;
            }
            DPRINTF(E_DBG,L_SCAN,"Type: bytes\n");
            break;
        case 0x0002: /* bool - dropthru */
        case 0x0003: /* dword */
            if(!wma_file_read_int(fd,&descriptor_int_value)) fail=1;
            DPRINTF(E_DBG,L_SCAN,"Type: int, value: %d\n",descriptor_int_value);
            snprintf(numbuff,sizeof(numbuff)-1,"%d",descriptor_int_value);
            descriptor_byte_value = strdup(numbuff);
            break;
        case 0x0004: /* qword */
            if(!wma_file_read_ll(fd,&descriptor_ll_value)) fail=1;
            DPRINTF(E_DBG,L_SCAN,"Type: ll, value: %lld\n",descriptor_ll_value);
            snprintf(numbuff,sizeof(numbuff)-1,"%lld",descriptor_ll_value);
            descriptor_byte_value = strdup(numbuff);
            break;
        case 0x0005: /* word */
            if(!wma_file_read_short(fd,&descriptor_short_value)) fail=1;
            DPRINTF(E_DBG,L_SCAN,"type: short, value %d\n",descriptor_short_value);
            snprintf(numbuff,sizeof(numbuff)-1,"%d",descriptor_short_value);
            descriptor_byte_value = strdup(numbuff);
            break;

            break;
        }

        if(fail) {
            free(descriptor_name);
            return FALSE;
        }

        /* do stuff with what we found */
        if(strcasecmp(descriptor_name,"wm/genre")==0) {
            MAYBEFREE(pmp3->genre);
            pmp3->genre = descriptor_byte_value;
            descriptor_byte_value = NULL; /* don't free it! */
        } else if(strcasecmp(descriptor_name,"wm/albumtitle")==0) {
            MAYBEFREE(pmp3->album);
            pmp3->album = descriptor_byte_value;
            descriptor_byte_value = NULL;
        } else if(strcasecmp(descriptor_name,"wm/track")==0) {
            track = descriptor_int_value + 1;
        } else if(strcasecmp(descriptor_name,"wm/shareduserrating")==0) {
            /* what a strange rating strategy */
            pmp3->rating = descriptor_int_value;
            if(pmp3->rating == 99) {
                pmp3->rating = 100;
            } else {
                if(pmp3->rating) {
                    pmp3->rating = (pmp3->rating / 25) + 1;
                }
            }
        } else if(strcasecmp(descriptor_name,"wm/tracknumber")==0) {
            tracknumber = descriptor_int_value;
        } else if(strcasecmp(descriptor_name,"wm/year")==0) {
            pmp3->year = atoi(descriptor_byte_value);
        } else if(strcasecmp(descriptor_name,"wm/composer")==0) {
            /* get first one only */
            if(!pmp3->composer) {
                pmp3->composer = descriptor_byte_value;
                descriptor_byte_value = NULL;
            }
        } else if(strcasecmp(descriptor_name,"wm/albumartist")==0) {
            /* get first one only */
            if(!pmp3->orchestra) {
                pmp3->orchestra = descriptor_byte_value;
                descriptor_byte_value = NULL;
            }
        } else if(strcasecmp(descriptor_name,"author") == 0) {
            /* get first one only */
            if(!pmp3->artist) {
                pmp3->artist = descriptor_byte_value;
                descriptor_byte_value = NULL;
            }
        } else if(strcasecmp(descriptor_name,"wm/contengroupdescription")==0) {
            MAYBEFREE(pmp3->grouping);
            pmp3->grouping = descriptor_byte_value;
            descriptor_byte_value = NULL;
        } else if(strcasecmp(descriptor_name,"comment")==0) {
            MAYBEFREE(pmp3->comment);
            pmp3->comment = descriptor_byte_value;
            descriptor_byte_value = NULL;
        }

        /* cleanup - done with this round */
        if(descriptor_byte_value) {
            free(descriptor_byte_value);
            descriptor_byte_value = NULL;
        }

        free(descriptor_name);
    }

    if(tracknumber) {
        pmp3->track = tracknumber;
    } else if(track) {
        pmp3->track = track;
    }

    if((!pmp3->artist) && (pmp3->orchestra)) {
        pmp3->artist = strdup(pmp3->orchestra);
    }

    if((pmp3->artist) && (!pmp3->orchestra)) {
        pmp3->orchestra = strdup(pmp3->artist);
    }

    return TRUE;
}

/**
 * parse the content description object.  this is an object that
 * contains lengths of title, author, copyright, descr, and rating
 * then the utf-16le strings for each.
 *
 * @param fd fd of the file we are reading from -- positioned at start
 * @param size size of the content description block
 * @param pmp3 the mp3 struct we are filling with gleaned data
 */
int wma_parse_content_description(int fd,int size, MP3FILE *pmp3) {
    unsigned short sizes[5];
    int index;
    char *utf8;

    if(size < 10) /* must be at least enough room for the size block */
        return FALSE;

    for(index=0; index < 5; index++) {
        if(!wma_file_read_short(fd,&sizes[index]))
            return FALSE;
    }

    for(index=0;index<5;index++) {
        if(sizes[index]) {
            if(!wma_file_read_utf16(fd,sizes[index],&utf8))
                return FALSE;

            DPRINTF(E_DBG,L_SCAN,"Got item of length %d: %s\n",sizes[index],utf8);
            
            switch(index) {
            case 0: /* title */
                if(pmp3->title)
                    free(pmp3->title);
                pmp3->title = utf8;
                break;
            case 1: /* author */
                if(pmp3->artist)
                    free(pmp3->artist);
                pmp3->artist = utf8;
                break;
            case 2: /* copyright - dontcare */
                free(utf8);  
            break;
            case 3: /* description */
                if(pmp3->comment)
                    free(pmp3->comment);
                pmp3->comment = utf8;
                break;
            case 4: /* rating - dontcare */
                free(utf8);
                break;
            default: /* can't get here */
                DPRINTF(E_FATAL,L_SCAN,"This is not my beautiful wife.\n");
                break;
            }
        }
    }

    return TRUE;
}

/**
 * parse the file properties object.  this is an object that
 * contains playtime and bitrate, primarily.
 *
 * @param fd fd of the file we are reading from -- positioned at start
 * @param size size of the content description block
 * @param pmp3 the mp3 struct we are filling with gleaned data
 */
int wma_parse_file_properties(int fd,int size, MP3FILE *pmp3) {
    unsigned long long play_duration;
    unsigned long long send_duration;
    unsigned long long preroll;
    
    unsigned int max_bitrate;

    /* skip guid (16 bytes), filesize (8), creation time (8),
     * data packets (8) 
     */
    lseek(fd,40,SEEK_CUR);

    if(!wma_file_read_ll(fd, &play_duration))
        return FALSE;

    if(!wma_file_read_ll(fd, &send_duration))
        return FALSE;

    if(!wma_file_read_ll(fd, &preroll))
        return FALSE;

    DPRINTF(E_DBG,L_SCAN,"play_duration: %lld, "
            "send_duration: %lld, preroll: %lld\n",
            play_duration, send_duration, preroll);

    /* I'm not entirely certain what preroll is, but it seems
     * to make it match up with what windows thinks is the song
     * length.
     */
    pmp3->song_length = (int)((play_duration / 10000) - preroll);
    
    /* skip flags(4),
     * min_packet_size (4), max_packet_size(4)
     */

    lseek(fd,12,SEEK_CUR);
    if(!wma_file_read_int(fd,&max_bitrate))
        return FALSE;

    pmp3->bitrate = max_bitrate/1000;

    return TRUE;
}

/**
 * convert utf16 string to utf8.  This is a bit naive, but...
 * Since utf-8 can't expand past 4 bytes per code point, and
 * we're converting utf-16, we can't be more than 2n+1 bytes, so
 * we'll just allocate that much. 
 *
 * Probably it could be more efficiently calculated, but this will
 * always work.  Besides, these are small strings, and will be freed
 * after the db insert.
 *
 * We assume this is utf-16LE, as it comes from windows
 *
 * @param utf16 utf-16 to convert
 * @param len length of utf-16 string
 */
char *wma_utf16toutf8(unsigned char *utf16, int len) {
    char *utf8;
    unsigned char *src=utf16;
    char *dst;
    unsigned int w1, w2;
    int bytes;

    if(!len)
        return NULL;

    utf8=(char *)malloc(len*2 + 1);
    if(!utf8)
        return NULL;

    memset(utf8,0x0,len*2 + 1);
    dst=utf8;

    while((src+2) <= utf16+len) {
        w1=src[1] << 8 | src[0];
        src += 2;
        if((w1 & 0xFC00) == 0xD800) { /* could be surrogate pair */
            if(src+2 > utf16+len) {
                DPRINTF(E_INF,L_SCAN,"Invalid utf-16 in file\n");
                free(utf8);
                return NULL;
            }
            w2 = src[3] << 8 | src[2];
            if((w2 & 0xFC00) != 0xDC00) {
                DPRINTF(E_INF,L_SCAN,"Invalid utf-16 in file\n");
                free(utf8);
                return NULL;
            }

            /* get bottom 10 of each */
            w1 = w1 & 0x03FF;
            w1 = w1 << 10;
            w1 = w1 | (w2 & 0x03FF);

            /* add back the 0x10000 */
            w1 += 0x10000;
        }

        /* now encode the original code point in utf-8 */
        if (w1 < 0x80) {
            *dst++ = w1;
            bytes=0;
        } else if (w1 < 0x800) {
            *dst++ = 0xC0 | (w1 >> 6);
            bytes=1;
        } else if (w1 < 0x10000) {
            *dst++ = 0xE0 | (w1 >> 12);
            bytes=2;
        } else {
            *dst++ = 0xF0 | (w1 >> 18);
            bytes=3;
        }

        while(bytes) {
            *dst++ = 0x80 | ((w1 >> (6*(bytes-1))) & 0x3f);
            bytes--;
        }
    }

    return utf8;
}

/**
 * lookup a guid by character
 *
 * @param guid 16 byte guid to look up
 */
WMA_GUID *wma_find_guid(unsigned char *guid) {
    WMA_GUID *pguid = wma_guidlist;

    while((pguid->name) && (memcmp(guid,pguid->value,16) != 0)) {
        pguid++;
    }

    if(!pguid->name)
        return NULL;

    return pguid;
}

/**
 * convert a short int in wrong-endian format to host-endian
 *
 * @param src pointer to 16-bit wrong-endian int
 */
unsigned short wma_convert_short(unsigned char *src) {
    return src[1] << 8 |
        src[0];
}

/**
 * convert an int in wrong-endian format to host-endian
 *
 * @param src pointer to 32-bit wrong-endian int
 */
unsigned int wma_convert_int(unsigned char *src) {
    return src[3] << 24 |
        src[2] << 16 |
        src[1] << 8 |
        src[0];
}

/**
 * convert a long long wrong-endian format to host-endian
 *
 * @param src pointer to 64-bit wrong-endian int
 */

unsigned long long wma_convert_ll(unsigned char *src) {
    unsigned int tmp_hi, tmp_lo;
    unsigned long long retval;

    tmp_hi = src[7] << 24 |
        src[6] << 16 |
        src[5] << 8 |
        src[4];

    tmp_lo = src[3] << 24 |
        src[2] << 16 |
        src[1] << 8 |
        src[0];

    retval = tmp_hi;
    retval = (retval << 32) | tmp_lo;

    return retval;
}

/**
 * get metainfo about a wma file
 *
 * @param filename full path to file to scan
 * @param pmp3 MP3FILE struct to be filled with with metainfo
 */
int scan_get_wmainfo(char *filename, MP3FILE *pmp3) {
    int wma_fd;
    WMA_HEADER hdr;
    WMA_SUBHEADER subhdr;
    WMA_GUID *pguid;
    long offset=0;
    int item;
    int err;
    int res=TRUE;

    wma_fd = r_open2(filename,O_RDONLY);
    if(wma_fd == -1) {
        DPRINTF(E_INF,L_SCAN,"Error opening WMA file (%s): %s\n",filename,
                strerror(errno));
        return FALSE;
    }

    if(read(wma_fd,(void*)&hdr,sizeof(hdr)) != sizeof(hdr)) {
        DPRINTF(E_INF,L_SCAN,"Error reading from %s: %s\n",filename,
                strerror(errno));
        r_close(wma_fd);
        return FALSE;
    }

    pguid = wma_find_guid(hdr.objectid);
    if(!pguid) {
        DPRINTF(E_INF,L_SCAN,"Could not find header in %s\n",filename);
        r_close(wma_fd);
        return FALSE;
    }

    hdr.objects=wma_convert_int((unsigned char *)&hdr.objects);
    hdr.size=wma_convert_ll((unsigned char *)&hdr.size);

    DPRINTF(E_DBG,L_SCAN,"Found WMA header: %s\n",pguid->name);
    DPRINTF(E_DBG,L_SCAN,"Header size:      %lld\n",hdr.size);
    DPRINTF(E_DBG,L_SCAN,"Header objects:   %d\n",hdr.objects);

    offset = sizeof(hdr); //hdr.size;

    /* Now we just walk through all the headers and see if we
     * find anything interesting
     */
    
    for(item=0; item < (int) hdr.objects; item++) {
        if(lseek(wma_fd,offset,SEEK_SET) == (off_t)-1) {
            DPRINTF(E_INF,L_SCAN,"Error seeking in %s\n",filename);
            r_close(wma_fd);
            return FALSE;
        }

        if(r_read(wma_fd,(void*)&subhdr,sizeof(subhdr)) != sizeof(subhdr)) {
            err=errno;
            DPRINTF(E_INF,L_SCAN,"Error reading from %s: %s\n",filename,
                    strerror(err));
            r_close(wma_fd);
            return FALSE;
        }

        subhdr.size=wma_convert_ll((unsigned char *)&subhdr.size);

        pguid = wma_find_guid(subhdr.objectid);
        if(pguid) {
            DPRINTF(E_DBG,L_SCAN,"Found subheader: %s\n",pguid->name);
            if(strcmp(pguid->name,"ASF_Content_Description_Object")==0) {
                res &= wma_parse_content_description(wma_fd,(int)subhdr.size,pmp3);
            } else if (strcmp(pguid->name,"ASF_Extended_Content_Description_Object")==0) {
                res &= wma_parse_extended_content_description(wma_fd,(int)subhdr.size,pmp3);
            } else if (strcmp(pguid->name,"ASF_File_Properties_Object")==0) {
                res &= wma_parse_file_properties(wma_fd,(int)subhdr.size,pmp3);
            }
        } else {
            DPRINTF(E_DBG,L_SCAN,"Unknown subheader: %02hhx%02hhx%02hhx%02hhx-"
            "%02hhx%02hhx-%02hhx%02hhx-%02hhx%02hhx-"
            "%02hhx%02hhx%02hhx%02hhx%02hhx%02hhx\n",
            subhdr.objectid[3],subhdr.objectid[2],
            subhdr.objectid[1],subhdr.objectid[0],
            subhdr.objectid[5],subhdr.objectid[4],
            subhdr.objectid[7],subhdr.objectid[6],
            subhdr.objectid[8],subhdr.objectid[9],
            subhdr.objectid[10],subhdr.objectid[11],
            subhdr.objectid[12],subhdr.objectid[13],
            subhdr.objectid[14],subhdr.objectid[15]);

        }
        offset += (long) subhdr.size;
    }


    if(!res) {
        DPRINTF(E_INF,L_SCAN,"Error reading meta info for file %s\n",
                filename);
    } else {
        DPRINTF(E_DBG,L_SCAN,"Successfully parsed file\n");
    }

    r_close(wma_fd);
    
    return res;
}