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Store range coder state transition table.

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Use a better table, 2% compression gain for foreman

Originally committed as revision 22763 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2010-04-01 18:51:08 +00:00
parent fa034b4427
commit 00bbc09309
1 changed files with 47 additions and 2 deletions
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49
libavcodec/ffv1.c
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@ -186,6 +186,25 @@ static const int8_t quant13[256]={
-4,-4,-4,-4,-4,-4,-4,-4,-4,-3,-3,-3,-3,-2,-2,-1,
};
static const uint8_t ver2_state[256]= {
0, 10, 10, 10, 10, 16, 16, 16, 28, 16, 16, 29, 42, 49, 20, 49,
59, 25, 26, 26, 27, 31, 33, 33, 33, 34, 34, 37, 67, 38, 39, 39,
40, 40, 41, 79, 43, 44, 45, 45, 48, 48, 64, 50, 51, 52, 88, 52,
53, 74, 55, 57, 58, 58, 74, 60, 101, 61, 62, 84, 66, 66, 68, 69,
87, 82, 71, 97, 73, 73, 82, 75, 111, 77, 94, 78, 87, 81, 83, 97,
85, 83, 94, 86, 99, 89, 90, 99, 111, 92, 93, 134, 95, 98, 105, 98,
105, 110, 102, 108, 102, 118, 103, 106, 106, 113, 109, 112, 114, 112, 116, 125,
115, 116, 117, 117, 126, 119, 125, 121, 121, 123, 145, 124, 126, 131, 127, 129,
165, 130, 132, 138, 133, 135, 145, 136, 137, 139, 146, 141, 143, 142, 144, 148,
147, 155, 151, 149, 151, 150, 152, 157, 153, 154, 156, 168, 158, 162, 161, 160,
172, 163, 169, 164, 166, 184, 167, 170, 177, 174, 171, 173, 182, 176, 180, 178,
175, 189, 179, 181, 186, 183, 192, 185, 200, 187, 191, 188, 190, 197, 193, 196,
197, 194, 195, 196, 198, 202, 199, 201, 210, 203, 207, 204, 205, 206, 208, 214,
209, 211, 221, 212, 213, 215, 224, 216, 217, 218, 219, 220, 222, 228, 223, 225,
226, 224, 227, 229, 240, 230, 231, 232, 233, 234, 235, 236, 238, 239, 237, 242,
241, 243, 242, 244, 245, 246, 247, 248, 249, 250, 251, 252, 252, 253, 254, 255,
};
typedef struct VlcState{
int16_t drift;
uint16_t error_sum;
@ -215,6 +234,7 @@ typedef struct FFV1Context{
int ac; ///< 1=range coder <-> 0=golomb rice
PlaneContext plane[MAX_PLANES];
int16_t quant_table[5][256];
uint8_t state_transition[256];
int run_index;
int colorspace;
@ -578,7 +598,13 @@ static void write_header(FFV1Context *f){
memset(state, 128, sizeof(state));
put_symbol(c, state, f->version, 0);
put_symbol(c, state, f->avctx->coder_type, 0);
put_symbol(c, state, f->ac, 0);
if(f->ac>1){
for(i=1; i<256; i++){
f->state_transition[i]=ver2_state[i];
put_symbol(c, state, ver2_state[i] - c->one_state[i], 1);
}
}
put_symbol(c, state, f->colorspace, 0); //YUV cs type
if(f->version>0)
put_symbol(c, state, f->avctx->bits_per_raw_sample, 0);
@ -617,7 +643,7 @@ static av_cold int encode_init(AVCodecContext *avctx)
common_init(avctx);
s->version=0;
s->ac= avctx->coder_type;
s->ac= avctx->coder_type ? 2:0;
s->plane_count=2;
for(i=0; i<256; i++){
@ -754,6 +780,12 @@ static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size,
used_count += ff_rac_terminate(c);
//printf("pos=%d\n", used_count);
init_put_bits(&f->pb, buf + used_count, buf_size - used_count);
}else if (f->ac>1){
int i;
for(i=1; i<256; i++){
c->one_state[i]= f->state_transition[i];
c->zero_state[256-i]= 256-c->one_state[i];
}
}
if(f->colorspace==0){
@ -967,6 +999,11 @@ static int read_header(FFV1Context *f){
f->version= get_symbol(c, state, 0);
f->ac= f->avctx->coder_type= get_symbol(c, state, 0);
if(f->ac>1){
for(i=1; i<256; i++){
f->state_transition[i]= get_symbol(c, state, 1) + c->one_state[i];
}
}
f->colorspace= get_symbol(c, state, 0); //YUV cs type
if(f->version>0)
f->avctx->bits_per_raw_sample= get_symbol(c, state, 0);
@ -1071,6 +1108,14 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPac
}else{
p->key_frame= 0;
}
if(f->ac>1){
int i;
for(i=1; i<256; i++){
c->one_state[i]= f->state_transition[i];
c->zero_state[256-i]= 256-c->one_state[i];
}
}
if(!f->plane[0].state && !f->plane[0].vlc_state)
return -1;