4. mp3 aus Arbeitsspeicher filtern

mp3 aus Arbeitsspeicher filtern

  • ?

    Ich versuche mp3s aus dem RAM von firefox zu extrahieren.
    Funktioniert super, wenn ich nen RAW mp3 byte array habe (dann schneidet das Programm die id3 tags ab aber damit kann ich leben).
    Bei firefox werden zwar auch ca. 3.6 MB an mp3 daten gefunden (es kommen alle <2000 bytes Sync Bits und am Anfang die byte-Folge "LAME3.95" vor), nur kann ich die Daten nicht abspielen.
    Hat jemand eine Idee, was falsch gelaufen sein könnte?

    Der frame header scheint mir auf den ersten Blick gültig:

    FF FB 90 60 00 0F F0 00
Sync: 0x7FF
//MPEG Version 1
Version: 3
//mp3
Layer: 1
Protection Bit: 1
//128 kbps
Bitrate: 9
//44100 Hz
Sampling: 0
Padding: 0/1
Private Bit: 0
//Joint Stereo
Channel: 1
//Intensity stereo off and MS stereo on
Mode Extension: 2
Copyright: 0
Original: 0
Emphasis: 0

    #include <stdio.h>
#include <stdlib.h>
#include <stdint.h>

typedef struct{
    uint32_t sync:      11;
    uint32_t version:    2;
    uint32_t layer:      2;
    uint32_t protection: 1;
    uint32_t bitrate:    4;
    uint32_t sampling:   2;
    uint32_t padding:    1;
    uint32_t privateBit: 1;
    uint32_t channel:    2;
    uint32_t modeExt:    2;
    uint32_t copyright:  1;
    uint32_t original:   1;
    uint32_t emphasis:   2;
} Frame;

void readFrame(Frame *frame, uint8_t *data){
    frame->sync =  (data[0]<<3) | (data[1]>>5);//11111111 111
    frame->version    =      (data[1]&  24)>>3;//00011000
    frame->layer      =      (data[1]&   6)>>1;//00000110
    frame->protection =      (data[1]&   1)>>0;//00000001

    frame->bitrate    =      (data[2]&0xF0)>>4;//11110000
    frame->sampling   =      (data[2]&  12)>>2;//00001100
    frame->padding    =      (data[2]&   2)>>1;//00000010
    frame->privateBit =      (data[2]&   1)>>0;//00000001

    frame->channel    =      (data[3]& 192)>>6;//11000000
    frame->modeExt    =      (data[3]&  45)>>4;//00110000
    frame->copyright  =      (data[3]&   8)>>3;//00001000
    frame->original   =      (data[3]&   4)>>2;//00000100
    frame->emphasis   =      (data[3]&   3)>>0;//00000011
}

int getLowest(int *data, int n){
    int i, lowest = 123456789;
    for (i=0; i<n; i++) if(data[i]<lowest) lowest = data[i];
    return lowest;
}

int isNiceFrame(Frame *f){
    return
    (f->sync == 0x7FF) &&//sync bits
    (f->bitrate != 15) &&//reserved
    (f->layer    == 1) &&//mp3
    (f->emphasis == 0) &&//usually unused
    (f->sampling != 3);  //reserved
}

int main(){
    //dumped with Windows 7 task manager
    FILE *fp = fopen("plugin-container.DMP", "rb");
    fseek(fp, 0, SEEK_END);
    int n = ftell(fp);
    rewind(fp);
    uint8_t *data = (uint8_t*)malloc(n);
    fread(data, 1, n, fp);
    fclose(fp);

    Frame f;

    int i, j;
    int last = 0;
    int lastIndex = 0;
    int maxFrameSize = 2000;
    int consecutiveSyncBits = 100;
    int dist[consecutiveSyncBits];
    int where[consecutiveSyncBits];
    for (i=0; i<consecutiveSyncBits; i++) where[i] =  dist[i] = 123456789;

    for (i=0; i<n; i++){
        readFrame(&f, data+i);
        //printFrame(f);
        if (isNiceFrame(&f)){

            //Save position of current sync bits
            where[lastIndex] = i;
            //Save distance for current sync bits
            dist[lastIndex] = i - last;
            //Clamp index to range [0, consecutiveSyncBits]
            lastIndex = lastIndex + 1 < consecutiveSyncBits ? lastIndex + 1 : 0;

            //Check for many consecutive sync bits
            int manySyncBits = 1;
            for (j=0; j<consecutiveSyncBits; j++){
                if (dist[j] > maxFrameSize){
                    manySyncBits = 0;
                    break;
                }
            }

            if (manySyncBits){
                printf("Sync: 0x%x\n",         f.sync);
                printf("Version: %i\n",        f.version);
                printf("Layer: %i\n",          f.layer);
                printf("Protection: %i\n",     f.protection);
                printf("Bitrate: %i\n",        f.bitrate);
                printf("Sampling: %i\n",       f.sampling);
                printf("Padding: %i\n",        f.padding);
                printf("PrivateBit: %i\n",     f.privateBit);
                printf("Channel: %i\n",        f.channel);
                printf("Mode Extension: %i\n", f.modeExt);
                printf("Copyright: %i\n",      f.copyright);
                printf("Original: %i\n",       f.original);
                printf("Emphasis: %i\n\n",     f.emphasis);

                puts("Found many consecutive sync bits");
                //search last frame
                while (i - last < maxFrameSize){
                    i++;
                    readFrame(&f, data+i);
                    if (f.sync == 0x7FF) last = i;
                }

                fp = fopen("out.mp3", "wb");
                //get first frame
                int start = getLowest(where, consecutiveSyncBits);
                //dump data from first to last frame to file
                fwrite(data+start, 1, i - start, fp);
                fclose(fp);

                printf("Wrote %i bytes to file\n", i - start);
                break;
            }
            last = i;
        }
    }

    free(data);
    return 0;
}

    first 0x600 bytes of out.mp3

    Offset(h) 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F

00000000  FF FB 90 60 00 0F F0 00 00 69 00 00 00 08 00 00  ÿû.`..ð..i......
00000010  0D 20 00 00 01 00 00 01 A4 00 00 00 20 00 00 34  . ......¤... ..4
00000020  80 00 00 04 4C 41 4D 45 33 2E 39 35 00 00 00 00  €...LAME3.95....
00000030  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
00000040  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
00000050  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
00000060  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
00000070  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
00000080  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
00000090  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
000000A0  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
000000B0  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
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000000D0  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
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00000100  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
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00000160  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
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