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use sparse huffman tables. 1.5% faster huffyuv decoding. 

Originally committed as revision 9118 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Loren Merritt 2007-05-24 17:40:02 +00:00
parent b613bacca9
commit acc0e0c8b6
1 changed files with 9 additions and 10 deletions
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19
libavcodec/huffyuv.c
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@ -71,7 +71,6 @@ typedef struct HYuvContext{
uint8_t len[3][256];
uint32_t bits[3][256];
VLC vlc[6]; //Y,U,V,YY,YU,YV
uint16_t pix2_map[3][1<<VLC_BITS];
AVFrame picture;
uint8_t *bitstream_buffer;
unsigned int bitstream_buffer_size;
@ -320,9 +319,9 @@ static void generate_len_table(uint8_t *dst, uint64_t *stats, int size){
#endif /* CONFIG_ENCODERS */
static void generate_joint_tables(HYuvContext *s){
// TODO modify init_vlc to allow sparse tables, and eliminate pix2_map
// TODO rgb
if(s->bitstream_bpp < 24){
uint16_t symbols[1<<VLC_BITS];
uint16_t bits[1<<VLC_BITS];
uint8_t len[1<<VLC_BITS];
int p, i, y, u;
@ -336,14 +335,15 @@ static void generate_joint_tables(HYuvContext *s){
if(len1 <= limit){
len[i] = len0 + len1;
bits[i] = (s->bits[0][y] << len1) + s->bits[p][u];
s->pix2_map[p][i] = (y<<8) + u;
i++;
symbols[i] = (y<<8) + u;
if(symbols[i] != 0xffff) // reserved to mean "invalid"
i++;
}
}
}
}
free_vlc(&s->vlc[3+p]);
init_vlc(&s->vlc[3+p], VLC_BITS, i, len, 1, 1, bits, 2, 2, 0);
init_vlc_sparse(&s->vlc[3+p], VLC_BITS, i, len, 1, 1, bits, 2, 2, symbols, 2, 2, 0);
}
}
}
@ -690,11 +690,10 @@ static int encode_init(AVCodecContext *avctx)
/* TODO instead of restarting the read when the code isn't in the first level
* of the joint table, jump into the 2nd level of the individual table. */
#define READ_2PIX(dst0, dst1, plane1){\
int code = get_vlc2(&s->gb, s->vlc[3+plane1].table, VLC_BITS, 1);\
if(code >= 0){\
int x = s->pix2_map[plane1][code];\
dst0 = x>>8;\
dst1 = x;\
uint16_t code = get_vlc2(&s->gb, s->vlc[3+plane1].table, VLC_BITS, 1);\
if(code != 0xffff){\
dst0 = code>>8;\
dst1 = code;\
}else{\
dst0 = get_vlc2(&s->gb, s->vlc[0].table, VLC_BITS, 3);\
dst1 = get_vlc2(&s->gb, s->vlc[plane1].table, VLC_BITS, 3);\