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authorMichael Giacomelli <giac2000@hotmail.com>2012-04-30 23:28:57 -0400
committerMichael Giacomelli <giac2000@hotmail.com>2012-05-01 05:42:38 +0200
commit87d3dde15a1f0af6eaac21107d74aa240515fd0c (patch)
treef0148dd45df72e22b610b9069d5d1563adc715b7 /apps/plugins/lua/rocklua.c
parentf5d9a45e3ffb1326dced431025cc10814ea4b7d8 (diff)
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Fix corrupt when repeatidly playing very low bitrate WMA files.
The LSP feature in WMA requires that the noise table values be doubled verses when it is not used. Unfortunately, the previous code would double the same values every time a LSP file was decoded without first resetting them to their original values. Change the code to check if the values are already doubled, and then double/halve them as needed. This is still a bit ugly, in the future consider using the built in rockbox dither instead of a lookup table. Fixes playback when skipping back and forth between low and high bitrate WMA. Change-Id: I4c393092e4a789bc8f98d74274fe207400b9550e Reviewed-on: http://gerrit.rockbox.org/226 Reviewed-by: Michael Giacomelli <giac2000@hotmail.com> Tested-by: Michael Giacomelli <giac2000@hotmail.com>
Diffstat (limited to '')
0 files changed, 0 insertions, 0 deletions
generated by cgit v1.1 at 2026-05-05 15:32:29 +0000
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/***************************************************************************
 *             __________               __   ___.
 *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
 *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
 *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
 *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
 *                     \/            \/     \/    \/            \/
 * $Id$
 *
 * Copyright (C) 2006 by Barry Wardell
 *
 * Based on Rockbox iriver bootloader by Linus Nielsen Feltzing
 * and the ipodlinux bootloader by Daniel Palffy and Bernard Leach
 * 
 * All files in this archive are subject to the GNU General Public License.
 * See the file COPYING in the source tree root for full license agreement.
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
 * KIND, either express or implied.
 *
 ****************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include "common.h"
#include "cpu.h"
#include "file.h"
#include "system.h"
#include "kernel.h"
#include "lcd.h"
#include "font.h"
#include "ata.h"
#include "button.h"
#include "disk.h"
#include "crc32-mi4.h"
#include <string.h>
#ifdef SANSA_E200
#include "usb.h"
#endif


/* Button definitions */
#if CONFIG_KEYPAD == IRIVER_H10_PAD
#define BOOTLOADER_BOOT_OF      BUTTON_LEFT

#elif CONFIG_KEYPAD == SANSA_E200_PAD
#define BOOTLOADER_BOOT_OF      BUTTON_LEFT

#endif

/* Maximum allowed firmware image size. 10MB is more than enough */
#define MAX_LOADSIZE (10*1024*1024)

/* A buffer to load the original firmware or Rockbox into */
unsigned char *loadbuffer = (unsigned char *)DRAM_START;

/* Bootloader version */
char version[] = APPSVERSION;
        
/* Locations and sizes in hidden partition on Sansa */
#ifdef SANSA_E200
#define PPMI_SECTOR_OFFSET  1024
#define PPMI_SECTORS        1
#define MI4_HEADER_SECTORS  1
#define NUM_PARTITIONS      2

#else
#define NUM_PARTITIONS      1

#endif

#define MI4_HEADER_SIZE     0x200

/* mi4 header structure */
struct mi4header_t {
    unsigned char magic[4];
    uint32_t version;
    uint32_t length;
    uint32_t crc32;
    uint32_t enctype;
    uint32_t mi4size;
    uint32_t plaintext;
    uint32_t dsa_key[10];
    uint32_t pad[109];
    unsigned char type[4];
    unsigned char model[4];
};

/* PPMI header structure */
struct ppmi_header_t {
    unsigned char magic[4];
    uint32_t length;
    uint32_t pad[126];
};

inline unsigned int le2int(unsigned char* buf)
{
   int32_t res = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0];

   return res;
}

inline void int2le(unsigned int val, unsigned char* addr)
{
    addr[0] = val & 0xFF;
    addr[1] = (val >> 8) & 0xff;
    addr[2] = (val >> 16) & 0xff;
    addr[3] = (val >> 24) & 0xff;
}

struct tea_key {
  const char * name;
  uint32_t     key[4];
};

#define NUM_KEYS 11
struct tea_key tea_keytable[] = {
  { "default" ,          { 0x20d36cc0, 0x10e8c07d, 0xc0e7dcaa, 0x107eb080 } },
  { "sansa",             { 0xe494e96e, 0x3ee32966, 0x6f48512b, 0xa93fbb42 } },
  { "sansa_gh",          { 0xd7b10538, 0xc662945b, 0x1b3fce68, 0xf389c0e6 } },
  { "rhapsody",          { 0x7aa9c8dc, 0xbed0a82a, 0x16204cc7, 0x5904ef38 } },
  { "p610",              { 0x950e83dc, 0xec4907f9, 0x023734b9, 0x10cfb7c7 } },
  { "p640",              { 0x220c5f23, 0xd04df68e, 0x431b5e25, 0x4dcc1fa1 } },
  { "virgin",            { 0xe83c29a1, 0x04862973, 0xa9b3f0d4, 0x38be2a9c } },
  { "20gc_eng",          { 0x0240772c, 0x6f3329b5, 0x3ec9a6c5, 0xb0c9e493 } },
  { "20gc_fre",          { 0xbede8817, 0xb23bfe4f, 0x80aa682d, 0xd13f598c } },
  { "elio_p722",         { 0x6af3b9f8, 0x777483f5, 0xae8181cc, 0xfa6d8a84 } },
  { "c200",              { 0xbf2d06fa, 0xf0e23d59, 0x29738132, 0xe2d04ca7 } },
};

/*

tea_decrypt() from http://en.wikipedia.org/wiki/Tiny_Encryption_Algorithm

"Following is an adaptation of the reference encryption and decryption
routines in C, released into the public domain by David Wheeler and
Roger Needham:"

*/

/* NOTE: The mi4 version of TEA uses a different initial value to sum compared
         to the reference implementation and the main loop is 8 iterations, not
         32.
*/

static void tea_decrypt(uint32_t* v0, uint32_t* v1, uint32_t* k) {
    uint32_t sum=0xF1BBCDC8, i;                    /* set up */
    uint32_t delta=0x9E3779B9;                     /* a key schedule constant */
    uint32_t k0=k[0], k1=k[1], k2=k[2], k3=k[3];   /* cache key */
    for(i=0; i<8; i++) {                               /* basic cycle start */
        *v1 -= ((*v0<<4) + k2) ^ (*v0 + sum) ^ ((*v0>>5) + k3);
        *v0 -= ((*v1<<4) + k0) ^ (*v1 + sum) ^ ((*v1>>5) + k1);
        sum -= delta;                                   /* end cycle */
    }
}

/* mi4 files are encrypted in 64-bit blocks (two little-endian 32-bit
   integers) and the key is incremented after each block
 */

static void tea_decrypt_buf(unsigned char* src, unsigned char* dest, size_t n, uint32_t * key)
{
    uint32_t v0, v1;
    unsigned int i;

    for (i = 0; i < (n / 8); i++) {
        v0 = le2int(src);
        v1 = le2int(src+4);

        tea_decrypt(&v0, &v1, key);

        int2le(v0, dest);
        int2le(v1, dest+4);

        src += 8;
        dest += 8;

        /* Now increment the key */
        key[0]++;
        if (key[0]==0) {
            key[1]++;
            if (key[1]==0) {
                key[2]++;
                if (key[2]==0) {
                    key[3]++;
                }
            }
        }
    }
}

static inline bool tea_test_key(unsigned char magic_enc[8], uint32_t * key, int unaligned)
{
    unsigned char magic_dec[8];
    tea_decrypt_buf(magic_enc, magic_dec, 8, key);

    return (le2int(&magic_dec[4*unaligned]) == 0xaa55aa55);
}

static int tea_find_key(struct mi4header_t *mi4header, int fd)
{
    int i, rc;
    unsigned int j;
    uint32_t key[4];
    unsigned char magic_enc[8];
    int key_found = -1;
    unsigned int magic_location = mi4header->length-4;
    int unaligned = 0;
    
    if ( (magic_location % 8) != 0 )
    {
        unaligned = 1;
        magic_location -= 4;
    }
    
    /* Load encrypted magic 0xaa55aa55 to check key */
    lseek(fd, MI4_HEADER_SIZE + magic_location, SEEK_SET);
    rc = read(fd, magic_enc, 8);
    if(rc < 8 )
        return EREAD_IMAGE_FAILED;

    printf("Searching for key:");

    for (i=0; i < NUM_KEYS && (key_found<0) ; i++) {
        key[0] = tea_keytable[i].key[0];
        key[1] = tea_keytable[i].key[1];
        key[2] = tea_keytable[i].key[2];
        key[3] = tea_keytable[i].key[3];
        
        /* Now increment the key */
        for(j=0; j<((magic_location-mi4header->plaintext)/8); j++){
            key[0]++;
            if (key[0]==0) {
                key[1]++;
                if (key[1]==0) {
                    key[2]++;
                    if (key[2]==0) {
                        key[3]++;
                    }
                }
            }
        }
        
        if (tea_test_key(magic_enc,key,unaligned))
        {
            key_found = i;
            printf("%s...found", tea_keytable[i].name);
        } else {
           /* printf("%s...failed", tea_keytable[i].name); */
        }
    }
    
    return key_found;
}


/* Load mi4 format firmware image */
int load_mi4(unsigned char* buf, char* firmware, unsigned int buffer_size)
{
    int fd;
    struct mi4header_t mi4header;
    int rc;
    unsigned long sum;
    char filename[MAX_PATH];

    snprintf(filename,sizeof(filename),"/.rockbox/%s",firmware);
    fd = open(filename, O_RDONLY);
    if(fd < 0)
    {
        snprintf(filename,sizeof(filename),"/%s",firmware);
        fd = open(filename, O_RDONLY);
        if(fd < 0)
            return EFILE_NOT_FOUND;
    }

    read(fd, &mi4header, MI4_HEADER_SIZE);

    /* MI4 file size */
    printf("mi4 size: %x", mi4header.mi4size);

    if ((mi4header.mi4size-MI4_HEADER_SIZE) > buffer_size)
        return EFILE_TOO_BIG;

    /* CRC32 */
    printf("CRC32: %x", mi4header.crc32);

    /* Rockbox model id */
    printf("Model id: %.4s", mi4header.model);

    /* Read binary type (RBOS, RBBL) */
    printf("Binary type: %.4s", mi4header.type);

    /* Load firmware file */
    lseek(fd, MI4_HEADER_SIZE, SEEK_SET);
    rc = read(fd, buf, mi4header.mi4size-MI4_HEADER_SIZE);
    if(rc < (int)mi4header.mi4size-MI4_HEADER_SIZE)
        return EREAD_IMAGE_FAILED;
 
    /* Check CRC32 to see if we have a valid file */
    sum = chksum_crc32 (buf, mi4header.mi4size - MI4_HEADER_SIZE);

    printf("Calculated CRC32: %x", sum);

    if(sum != mi4header.crc32)
        return EBAD_CHKSUM;
        
    if( (mi4header.plaintext + MI4_HEADER_SIZE) != mi4header.mi4size)
    {
        /* Load encrypted firmware */
        int key_index = tea_find_key(&mi4header, fd);
        
        if (key_index < 0)
            return EINVALID_FORMAT;
        
        /* Plaintext part is already loaded */
        buf += mi4header.plaintext;
        
        /* Decrypt in-place */
        tea_decrypt_buf(buf, buf, 
                        mi4header.mi4size-(mi4header.plaintext+MI4_HEADER_SIZE),
                        tea_keytable[key_index].key);

        printf("%s key used", tea_keytable[key_index].name);
        
        /* Check decryption was successfull */
        if(le2int(&buf[mi4header.length-mi4header.plaintext-4]) != 0xaa55aa55)
        {
            return EREAD_IMAGE_FAILED;
        }
    }

    return EOK;
}

#ifdef SANSA_E200
struct OFDB_info {
    char *version;
    int version_length;
    int sector;
    int offset;
} OFDatabaseOffsets[] = {
    { "PP5022AF-05.51-S301-01.11-S301.01.11A-D", 39, 0x3c08, 0xe1 },
    { "PP5022AF-05.51-S301-00.12-S301.00.12E-D", 39, 0x3c5c, 0x2 },
    { "PP5022AF-05.51-S301-00.12-S301.00.12A-D", 39, 0x3c08, 0xe1 },
};

/* Load mi4 firmware from a hidden disk partition */
int load_mi4_part(unsigned char* buf, struct partinfo* pinfo,
                  unsigned int buffer_size, bool disable_rebuild)
{
    struct mi4header_t mi4header;
    struct ppmi_header_t ppmi_header;
    unsigned long sum;
    
    /* Read header to find out how long the mi4 file is. */
    ata_read_sectors(IF_MV2(0,) pinfo->start + PPMI_SECTOR_OFFSET,
                            PPMI_SECTORS, &ppmi_header);
    
    /* The first four characters at 0x80000 (sector 1024) should be PPMI*/
    if( memcmp(ppmi_header.magic, "PPMI", 4) )
        return EFILE_NOT_FOUND;
    
    printf("BL mi4 size: %x", ppmi_header.length);
    
    /* Read mi4 header of the OF */
    ata_read_sectors(IF_MV2(0,) pinfo->start + PPMI_SECTOR_OFFSET + PPMI_SECTORS 
                       + (ppmi_header.length/512), MI4_HEADER_SECTORS, &mi4header);
    
    /* We don't support encrypted mi4 files yet */
    if( (mi4header.plaintext) != (mi4header.mi4size-MI4_HEADER_SIZE))
        return EINVALID_FORMAT;

    /* MI4 file size */
    printf("OF mi4 size: %x", mi4header.mi4size);

    if ((mi4header.mi4size-MI4_HEADER_SIZE) > buffer_size)
        return EFILE_TOO_BIG;

    /* CRC32 */
    printf("CRC32: %x", mi4header.crc32);

    /* Rockbox model id */
    printf("Model id: %.4s", mi4header.model);

    /* Read binary type (RBOS, RBBL) */
    printf("Binary type: %.4s", mi4header.type);

    /* Load firmware */
    ata_read_sectors(IF_MV2(0,) pinfo->start + PPMI_SECTOR_OFFSET + PPMI_SECTORS
                        + (ppmi_header.length/512) + MI4_HEADER_SECTORS,
                        (mi4header.mi4size-MI4_HEADER_SIZE)/512, buf);

    /* Check CRC32 to see if we have a valid file */
    sum = chksum_crc32 (buf,mi4header.mi4size-MI4_HEADER_SIZE);

    printf("Calculated CRC32: %x", sum);

    if(sum != mi4header.crc32)
        return EBAD_CHKSUM;
    
    if (disable_rebuild)
    {
        char block[512];
        int  sector = 0, offset = 0;
        unsigned int i;
        /* check which known version we have */
        /* These are taken from the PPPS section, 0x00780240 */
        ata_read_sectors(IF_MV2(0,) pinfo->start + 0x3C01, 1, block);
        for (i=0; i<sizeof(OFDatabaseOffsets)/sizeof(*OFDatabaseOffsets); i++)
        {
            if (!memcmp(&block[0x40], OFDatabaseOffsets[i].version,
                                      OFDatabaseOffsets[i].version_length))
            {
                sector = pinfo->start + OFDatabaseOffsets[i].sector;
                offset  = OFDatabaseOffsets[i].offset;
                break;
            }
        }
        if (sector && offset)
        {
            ata_read_sectors(IF_MV2(0,) sector, 1, block);
            block[offset] = 0;
            ata_write_sectors(IF_MV2(0,) sector, 1, block);
        }
    }
    return EOK;
}
#endif

void* main(void)
{
#ifndef SANSA_E200
    char buf[256];
    unsigned short* identify_info;
#endif
    int i;
    int btn;
    int rc;
    int num_partitions;
    struct partinfo* pinfo;
#ifdef SANSA_E200
    int usb_retry = 0;
    bool usb = false;
#endif

    chksum_crc32gentab ();

    system_init();
    kernel_init();
    lcd_init();
    font_init();
    button_init();

    lcd_set_foreground(LCD_WHITE);
    lcd_set_background(LCD_BLACK);
    lcd_clear_display();
    
    btn = button_read_device();
#ifdef SANSA_E200
    usb_init();
    while (usb_retry < 5 && !usb)
    {
        usb_retry++;
        sleep(HZ/4);
        usb = usb_detect();
    }
    if (usb)
        btn |= BOOTLOADER_BOOT_OF;
#endif
    /* Enable bootloader messages if any button is pressed */
    if (btn)
        verbose = true;

    lcd_setfont(FONT_SYSFIXED);

    printf("Rockbox boot loader");
    printf("Version: %s", version);
    printf(MODEL_NAME);

    i=ata_init();
#ifndef SANSA_E200
    if (i==0) {
        identify_info=ata_get_identify();
        /* Show model */
        for (i=0; i < 20; i++) {
            ((unsigned short*)buf)[i]=htobe16(identify_info[i+27]);
        }
        buf[40]=0;
        for (i=39; i && buf[i]==' '; i--) {
            buf[i]=0;
        }
        printf(buf);
    } else {
        error(EATA, i);
    }
#endif

    disk_init(IF_MV(0));
    num_partitions = disk_mount_all();
    if (num_partitions<=0)
    {
        error(EDISK,num_partitions);
    }

    /* Just list the first 2 partitions since we don't have any devices yet 
       that have more than that */
    for(i=0; i<NUM_PARTITIONS; i++)
    {
        pinfo = disk_partinfo(i);
        printf("Partition %d: 0x%02x %ld MB",
                i, pinfo->type, pinfo->size / 2048);
    }

    if(btn & BOOTLOADER_BOOT_OF)
    {
        /* Load original mi4 firmware in to a memory buffer called loadbuffer.
           The rest of the loading is done in crt0.S.
           1) First try reading from the hidden partition (on Sansa only).
           2) Next try a decrypted mi4 file in /System/OF.mi4
           3) Finally, try a raw firmware binary in /System/OF.mi4. It should be
              a mi4 firmware decrypted and header stripped using mi4code.
        */
        printf("Loading original firmware...");

#ifdef SANSA_E200        
        /* First try a (hidden) firmware partition */
        printf("Trying firmware partition");
        pinfo = disk_partinfo(1);
        if(pinfo->type == PARTITION_TYPE_OS2_HIDDEN_C_DRIVE)
        {
            rc = load_mi4_part(loadbuffer, pinfo, MAX_LOADSIZE, usb);
            if (rc < EOK) {
                printf("Can't load from partition");
                printf(strerror(rc));
            } else {
                return (void*)loadbuffer;
            }
        } else {
            printf("No hidden partition found.");
        }
#endif

        printf("Trying /System/OF.mi4");
        rc=load_mi4(loadbuffer, "/System/OF.mi4", MAX_LOADSIZE);
        if (rc < EOK) {
            printf("Can't load /System/OF.mi4");
            printf(strerror(rc));
        } else {
            return (void*)loadbuffer;
        }

        printf("Trying /System/OF.bin");
        rc=load_raw_firmware(loadbuffer, "/System/OF.bin", MAX_LOADSIZE);
        if (rc < EOK) {
            printf("Can't load /System/OF.bin");
            printf(strerror(rc));
        } else {
            return (void*)loadbuffer;
        }
        
        error(0, 0);

    } else {
#if 0 /* e200: enable to be able to dump the hidden partition */
        if(btn & BUTTON_UP)
        {
            int fd;
            pinfo = disk_partinfo(1);
            fd = open("/part.bin", O_CREAT|O_RDWR);
            char sector[512];
            for(i=0; i<40960; i++){
                if (!(i%100))
                {
                    printf("dumping sector %d", i);
                }
                ata_read_sectors(pinfo->start + i,1 , sector);
                write(fd,sector,512);
            }
            close(fd);
        }
#endif
        printf("Loading Rockbox...");
        rc=load_mi4(loadbuffer, BOOTFILE, MAX_LOADSIZE);
        if (rc < EOK) {
            printf("Can't load %s:", BOOTFILE);
            printf(strerror(rc));

            /* Try loading rockbox from old rockbox.e200/rockbox.h10 format */
            rc=load_firmware(loadbuffer, OLD_BOOTFILE, MAX_LOADSIZE);
            if (rc < EOK) {
                printf("Can't load %s:", OLD_BOOTFILE);
                error(EBOOTFILE, rc);
            }
        }
    }
    
    return (void*)loadbuffer;
}

#ifndef SANSA_E200
/* These functions are present in the firmware library, but we reimplement
   them here because the originals do a lot more than we want */
void usb_acknowledge(void)
{
}

void usb_wait_for_disconnect(void)
{
}
#endif