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optimize 

Originally committed as revision 1900 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2003-05-23 16:04:24 +00:00
parent 14b74d381a
commit 9fe690c88f
1 changed files with 11 additions and 25 deletions
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36
libavcodec/mjpeg.c
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@ -557,12 +557,7 @@ static inline void mjpeg_encode_dc(MpegEncContext *s, int val,
mant--;
}
/* compute the log (XXX: optimize) */
nbits = 0;
while (val != 0) {
val = val >> 1;
nbits++;
}
nbits= av_log2(val) + 1;
put_bits(&s->pb, huff_size[nbits], huff_code[nbits]);
@ -613,12 +608,7 @@ static void encode_block(MpegEncContext *s, DCTELEM *block, int n)
mant--;
}
/* compute the log (XXX: optimize) */
nbits = 0;
while (val != 0) {
val = val >> 1;
nbits++;
}
nbits= av_log2(val) + 1;
code = (run << 4) | nbits;
put_bits(&s->pb, huff_size_ac[code], huff_code_ac[code]);
@ -902,7 +892,7 @@ static int mjpeg_decode_sof0(MJpegDecodeContext *s)
static inline int mjpeg_decode_dc(MJpegDecodeContext *s, int dc_index)
{
int code, diff;
int code;
code = get_vlc2(&s->gb, s->vlcs[0][dc_index].table, 9, 2);
if (code < 0)
{
@ -910,20 +900,18 @@ static inline int mjpeg_decode_dc(MJpegDecodeContext *s, int dc_index)
&s->vlcs[0][dc_index]);
return 0xffff;
}
if (code == 0) {
diff = 0;
} else {
diff = get_xbits(&s->gb, code);
}
return diff;
if(code)
return get_xbits(&s->gb, code);
else
return 0;
}
/* decode block and dequantize */
static int decode_block(MJpegDecodeContext *s, DCTELEM *block,
int component, int dc_index, int ac_index, int quant_index)
{
int nbits, code, i, j, level;
int run, val;
int code, i, j, level, val;
VLC *ac_vlc;
int16_t *quant_matrix;
@ -953,10 +941,8 @@ static int decode_block(MJpegDecodeContext *s, DCTELEM *block,
if (code == 0xf0) {
i += 16;
} else {
run = code >> 4;
nbits = code & 0xf;
level = get_xbits(&s->gb, nbits);
i += run;
level = get_xbits(&s->gb, code & 0xf);
i += code >> 4;
if (i >= 64) {
dprintf("error count: %d\n", i);
return -1;