【VC开源代码栏目提醒】:文章导读:在新的一年中,各位网友都进入紧张的学习或是工作阶段。网学会员整理了VC开源代码-Common.cpp的相关内容供大家参考,祝大家在新的一年里工作和学习顺利!
#include <stdlib.h>
#include <signal.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include "mpg123.h"
struct parameter param = { 1 , 1 , 0 , 0 };
int tabsel_123[2][3][16] = {
{ {0,32,64,96,128,160,192,224,256,288,320,352,384,416,448,},
{0,32,48,56, 64, 80, 96,112,128,160,192,224,256,320,384,},
{0,32,40,48, 56, 64, 80, 96,112,128,160,192,224,256,320,} },
{ {0,32,48,56,64,80,96,112,128,144,160,176,192,224,256,},
{0,8,16,24,32,40,48,56,64,80,96,112,128,144,160,},
{0,8,16,24,32,40,48,56,64,80,96,112,128,144,160,} }
};
long freqs[9] = { 44100, 48000, 32000,
22050, 24000, 16000 ,
11025 , 12000 , 8000 };
int bitindex;
uint8_t *wordpointer;
uint8_t *pcm_sample;
int pcm_point = 0;
#define HDRCMPMASK 0xfffffd00
//对文件头进行编译,并将相关信息写入帧结构中
int head_check(unsigned long head)
{
if(head == 0xFF)
return FALSE;
if ((head & 0xffe00000) != 0xffe00000)
return FALSE;
if (!((head >> 17) & 3))
return FALSE;
if (((head >> 12) & 0xf) == 0xf)
return FALSE;
if (!((head >> 12) & 0xf))
return FALSE;
if (((head >> 10) & 0x3) == 0x3)
return FALSE;
if (((head >> 19) & 1) == 1 && ((head >> 17) & 3) == 3 && ((head >> 16) & 1) == 1)
return FALSE;
if ((head & 0xffff0000) == 0xfffe0000)
return FALSE;
return TRUE;
}
int decode_header(struct frame *fr,unsigned long newhead)
{
if( newhead & (1<<20) ) {
fr->lsf = (newhead & (1<<19)) ? 0x0 : 0x1;
fr->mpeg25 = 0;
} else {
fr->lsf = 1;
fr->mpeg25 = 1;
}
fr->lay = 4-((newhead>>17)&3);
if( ((newhead>>10)&0x3) == 0x3) {
return -1;
}
if(fr->mpeg25)
fr->sampling_frequency = 6 + ((newhead>>10)&0x3);
else
fr->sampling_frequency = ((newhead>>10)&0x3) + (fr->lsf*3);
fr->error_protection = ((newhead>>16)&0x1)^0x1;
if(fr->mpeg25)
fr->bitrate_index = ((newhead>>12)&0xf);
fr->bitrate_index = ((newhead>>12)&0xf);
fr->padding = ((newhead>>9)&0x1);
fr->extension = ((newhead>>8)&0x1);
fr->mode = ((newhead>>6)&0x3);
fr->mode_ext = ((newhead>>4)&0x3);
fr->copyright = ((newhead>>3)&0x1);
fr->original = ((newhead>>2)&0x1);
fr->emphasis = newhead & 0x3;
fr->stereo = (fr->mode == MPG_MD_MONO) ? 1 : 2;
if(!fr->bitrate_index) {
return -1;
}
switch(fr->lay) {
case 1:
#if 0
fr->jsbound = (fr->mode == MPG_MD_JOINT_STEREO) ?
(fr->mode_ext<<2)+4 : 32;
#endif
fr->framesize = (long) tabsel_123[fr->lsf][0][fr->bitrate_index] * 12000;
fr->framesize /= freqs[fr->sampling_frequency];
fr->framesize = ((fr->framesize+fr->padding)<<2)-4;
break;
case 2:
#if 0
fr->jsbound = (fr->mode == MPG_MD_JOINT_STEREO) ?
(fr->mode_ext<<2)+4 : fr->II_sblimit;
#endif
fr->framesize = (long) tabsel_123[fr->lsf][1][fr->bitrate_index] * 144000;
fr->framesize /= freqs[fr->sampling_frequency];
fr->framesize += fr->padding - 4;
break;
case 3:
#if 0
fr->do_layer = do_layer3;
if(fr->lsf)
ssize = (fr->stereo == 1) ? 9 : 17;
else
ssize = (fr->stereo == 1) ? 17 : 32;
#endif
fr->framesize = (long) tabsel_123[fr->lsf][2][fr->bitrate_index] * 144000;
fr->framesize /= freqs[fr->sampling_frequency]<<(fr->lsf);
fr->framesize = fr->framesize + fr->padding - 4;
break;
default:
return -1;
}
return 0;
}
/**
*
**/
uint32_t getbits (int number_of_bits)
{
uint32_t rval;
if(!number_of_bits)
return 0;
rval = wordpointer[0];
rval <<= 8;
rval |= wordpointer[1];
rval <<= 8;
rval |= wordpointer[2];
rval <<= bitindex;
rval &= 0xffffff;
bitindex += number_of_bits;
rval >>= (24-number_of_bits);
wordpointer += (bitindex>>3);
bitindex &= 7;
return rval;
}
/**
*
**/
uint16_t getbits_fast (int number_of_bits)
{
uint16_t rval;
rval = wordpointer[0];
rval <<= 8;
rval |= wordpointer[1];
rval <<= bitindex;
rval &= 0xffff;
bitindex += number_of_bits;
rval >>= (16-number_of_bits);
wordpointer += (bitindex>>3);
bitindex &= 7;
return rval;
}
/**
*
**/
uint8_t get1bit(void)
{
uint8_t rval;
rval = *wordpointer << bitindex;
bitindex++;
wordpointer += (bitindex>>3);
bitindex &= 7;
return rval>>7;
}
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