Author: sp

# Views: 1160

int GetVbrTag(VBRTAGDATA *pTagData,  unsigned char buf)
{
	int			i, head_flags;
	int			h_bitrate,h_id, h_mode, h_sr_index;
        int enc_delay,enc_padding; 

	/ get Vbr header data /
	pTagData->flags = 0;

	/ get selected MPEG header data /
	h_id       = (buf[1] >> 3) & 1;
	h_sr_index = (buf[2] >> 2) & 3;
	h_mode     = (buf[3] >> 6) & 3;
        h_bitrate  = ((buf[2]>>4)&0xf);
	h_bitrate = bitrate_table[h_id][h_bitrate];

        / check for FFE syncword */
        if ((buf[1]>>4)==0xE) 
            pTagData->samprate = samplerate_table[2][h_sr_index];
        else
            pTagData->samprate = samplerate_table[h_id][h_sr_index];
    ...

.text:100607D0 GetVbrTag       proc near               ; CODE XREF: sub_10059240+77p
.text:100607D0
.text:100607D0 arg_0           = dword ptr  4
.text:100607D0 arg_4           = dword ptr  8
.text:100607D0
.text:100607D0                 mov     ecx, [esp+arg_4]
.text:100607D4                 push    ebx
.text:100607D5                 push    ebp
.text:100607D6                 push    esi
.text:100607D7                 xor     eax, eax
.text:100607D9                 push    edi
.text:100607DA                 mov     edi, [esp+10h+arg_0]
.text:100607DE                 mov     dword ptr [edi+8], 0
.text:100607E5                 mov     dl, [ecx+1]
.text:100607E8                 movzx   ebx, byte ptr [ecx+3]
.text:100607EC                 mov     al, dl
.text:100607EE                 and     dl, 0F0h
.text:100607F1                 shr     ebx, 6
.text:100607F4                 shr     eax, 3
.text:100607F7                 and     eax, 1
.text:100607FA                 mov     ebp, eax
.text:100607FC                 movzx   eax, byte ptr [ecx+2]
.text:10060800                 mov     esi, eax
.text:10060802                 mov     [esp+10h+arg_0], ebp
.text:10060806                 shr     eax, 4
.text:10060809                 shl     ebp, 4
.text:1006080C                 add     eax, ebp
.text:1006080E                 mov     eax, ds:bitrate_table[eax*4]
.text:10060815                 mov     ebp, [esp+10h+arg_0]
.text:10060819                 shr     esi, 2
.text:1006081C                 and     esi, 3
.text:1006081F                 cmp     dl, 0E0h
.text:10060822                 mov     [esp+10h+arg_4], eax
.text:10060826                 jnz     short loc_10060831
.text:10060828                 mov     edx, ds:samplerate_table2[esi*4]
.text:1006082F                 jmp     short loc_1006083B