//写入帧头
void jmkr_write_frame_head(jpeg_compress_info *cinfo)
{
int i;
u16 Lf,X,Y;
u8 P,Nf,C,H,V,Tq;
jutl_write_byte(0xFF,cinfo->output);
jutl_write_byte(SOF0,cinfo->output);
Nf=cinfo->num_comp;
P=cinfo->precision;
X=cinfo->image_width;
Y=cinfo->image_height;
Lf=8+3*Nf;
jutl_write_byte(Lf>>8,cinfo->output);
jutl_write_byte(Lf&0xFF,cinfo->output);
jutl_write_byte(P,cinfo->output);
jutl_write_byte(Y>>8,cinfo->output);
jutl_write_byte(Y&0xFF,cinfo->output);
jutl_write_byte(X>>8,cinfo->output);
jutl_write_byte(X&0xFF,cinfo->output);
jutl_write_byte(Nf,cinfo->output);
for(i=0;i<Nf;i++)
{
C=cinfo->comp[i].comp_id;
H=cinfo->comp[i].h_factor;
V=cinfo->comp[i].v_factor;
Tq=cinfo->comp[i].quant_tbl_no;
jutl_write_byte(C,cinfo->output);
jutl_write_byte(((H<<4)|V),cinfo->output);
jutl_write_byte(Tq,cinfo->output);
}
}
void jhuff_write_bits (jpeg_compress_info *cinfo, UINT32 data, int len)
{
#ifdef DEBUG
printf("(b:%d;%d/%d)", bits_in_buffer, data, len);
#endif
UINT32 tdata;
while (len>0) {
tdata = (data<<(32-len));
buffer.all |= ((tdata >> bits_in_buffer));
bits_in_buffer += len;
/* output buffer */
if (bits_in_buffer >= 32) {
int i;
/* must be BIG ENDIAN */
for (i=3; i>=0; i--) {
jutl_write_byte(buffer.c[i], cinfo->output);
if (buffer.c[i]==0xFF)
jutl_write_byte(0x00, cinfo->output);
}
buffer.all = 0;
len = bits_in_buffer - 32;
bits_in_buffer=0;
}else{
len=0;
}
}
#ifdef DEBUG
printf("..buffer..%08X\n", buffer.all);
#endif
}
//写入扫描开始标志
void jmkr_write_scan_head(jpeg_compress_info *cinfo)
{
int i;
u16 Ls;
u8 Ns,Ss,Se,Ah,Al,Cs,Td,Ta;
jutl_write_byte(0xFF,cinfo->output);
jutl_write_byte(SOS,cinfo->output);
Ns=cinfo->num_comp;
Ls=6+2*Ns;
Ss=0;//定值!不改变
Se=63;
Ah=Al=0;
jutl_write_byte(Ls>>8,cinfo->output);
jutl_write_byte(Ls&0xFF,cinfo->output);
jutl_write_byte(Ns,cinfo->output);
for(i=0;i<Ns;i++)
{
Cs=cinfo->comp[i].comp_id;
Td=cinfo->comp[i].dc_tbl_no;
Ta=cinfo->comp[i].ac_tbl_no;
jutl_write_byte(Cs,cinfo->output);
jutl_write_byte((Td<<4|Ta),cinfo->output);
}
jutl_write_byte(Ss,cinfo->output);
jutl_write_byte(Se,cinfo->output);
jutl_write_byte(((Ah<<4)|Al),cinfo->output);
}
//清除/释放缓冲区
void jhuff_flush_buffer(jpeg_compress_info *cinfo)
{
int i=3;
while(bits_in_buffer>8)
{
jutl_write_byte(buffer.c[i],cinfo->output);
if(buffer.c[i]==0xFF)jutl_write_byte(0x00,cinfo->output);
i--;
bits_in_buffer-=8;
}
if(bits_in_buffer>0)
{
buffer.c[i]|=((u8)(0xFF)>>bits_in_buffer);
jutl_write_byte(buffer.c[i],cinfo->output);
if(buffer.c[i]==0xFF)jutl_write_byte(0x00,cinfo->output);
}
void jhuff_flush_buffer(jpeg_compress_info *cinfo)
{
int i;
i = 3;
#ifdef DEBUG
printf(" <FB:%08X,%d ", buffer.all, bits_in_buffer);
#endif
while (bits_in_buffer > 8) {
jutl_write_byte(buffer.c[i], cinfo->output);
if (buffer.c[i]==0xFF)
jutl_write_byte(0x00, cinfo->output);
i--;
bits_in_buffer -= 8;
}
if(bits_in_buffer > 0) {
buffer.c[i] |= ((unsigned char)(0xFF) >> bits_in_buffer);
jutl_write_byte(buffer.c[i], cinfo->output);
if (buffer.c[i]==0xFF)
jutl_write_byte(0x00, cinfo->output);
}
//写入量化表
void jmkr_write_quant_table(jpeg_compress_info *cinfo)
{
int i, j;
for (i=0;i<NUM_QUANT_TBLS;i++)
{
if (!cinfo->quant_table[i])continue;
jutl_write_byte(0xFF,cinfo->output);
jutl_write_byte(DQT,cinfo->output);
jutl_write_byte(0x00,cinfo->output);
jutl_write_byte(0x43,cinfo->output);//长度:固定为43h
jutl_write_byte(i&0xFF,cinfo->output);//ouput Pq & Tq
for (j=0;j<DCTSIZE2;j++)
{
u8 Q=cinfo->quant_table[i]->quantval[j];
jutl_write_byte(Q,cinfo->output);
}
}
}
//写文件结束标志
void jmkr_write_end(jpeg_compress_info *cinfo)
{
jutl_write_byte(0xFF,cinfo->output);
cinfo->state =JC_FINISH;//状态为完成
jutl_write_byte(EOI,cinfo->output);
}
//写入哈夫曼表
void jmkr_write_huff_table(jpeg_compress_info *cinfo)
{
int i,j,num_val;
u16 Lh;
for(i=0;i<NUM_HUFF_TBLS;i++)//输出直流HUFFMAN码
{
num_val=0;
if(!cinfo->dc_huff_table[i])continue;
jutl_write_byte(0xFF,cinfo->output);
jutl_write_byte(DHT,cinfo->output);
for(j=1;j<=16;j++)num_val+=cinfo->dc_huff_table[i]->bits[j];
Lh=3+16+num_val;//长度,固定为43h
jutl_write_byte(Lh>>8,cinfo->output);
jutl_write_byte(Lh&0xFF,cinfo->output);
jutl_write_byte(i,cinfo->output);//输出ID
for(j=1;j<=16;j++)jutl_write_byte(cinfo->dc_huff_table[i]->bits[j],cinfo->output);//输出bits
for(j=0;j<num_val;j++)jutl_write_byte(cinfo->dc_huff_table[i]->huffval[j],cinfo->output);
}
for(i=0;i<NUM_HUFF_TBLS;i++)//输出交流HUFFMAN码
{
num_val=0;
if(!cinfo->ac_huff_table[i])continue;
jutl_write_byte(0xFF,cinfo->output);
jutl_write_byte(DHT,cinfo->output);
for(j=1;j<=16;j++)num_val+=cinfo->ac_huff_table[i]->bits[j];
Lh=3+16+num_val;//长度,固定为43h
jutl_write_byte(Lh>>8,cinfo->output);
jutl_write_byte(Lh&0xFF,cinfo->output);
jutl_write_byte((0x10|i),cinfo->output);//输出ID
for(j=1;j<=16;j++)jutl_write_byte(cinfo->ac_huff_table[i]->bits[j],cinfo->output);//输出bits
for(j=0;j<num_val;j++)jutl_write_byte(cinfo->ac_huff_table[i]->huffval[j],cinfo->output);
}
}
//写入APP0应用数据段
void jmkr_write_jfif(jpeg_compress_info *cinfo)
{
int i;
for (i=0;i<18;i++)jutl_write_byte(jfcode[i], cinfo->output);
}
//写入文件开始标志
void jmkr_write_image_start(jpeg_compress_info *cinfo)
{
jutl_write_byte(0xFF,cinfo->output);
jutl_write_byte(SOI,cinfo->output);
}
