Skip to content

F
ffmpeg.wasm-core
Commit c2f1b2cb authored by Michael Niedermayer's avatar Michael Niedermayer
Browse files
Options

reducing memory consumption (reducing number of contexts and other stuff, no... 

reducing memory consumption (reducing number of contexts and other stuff, no noticeable loss in compression rate)

Originally committed as revision 1942 to svn://svn.ffmpeg.org/ffmpeg/trunk
parent 5e0257e3
Hide whitespace changes
Inline Side-by-side
Showing with 33 additions and 49 deletions
libavcodec/ffv1.c
View file @ c2f1b2cb
......@@ -30,6 +30,8 @@
#include "cabac.h"
#define MAX_PLANES 4
#define CONTEXT_SIZE 32
#if 0
#define DEFAULT_QDIFF_COUNT (9)
......@@ -76,18 +78,18 @@ static const uint8_t default_quant_table[256]={
};
#endif
static const int to8[16]={
0,1,1,1,
1,2,2,3,
4,5,6,6,
7,7,7,7
static const int to5[16]={
0,0,0,0,
0,0,0,1,
2,3,4,4,
4,4,4,4,
};
typedef struct PlaneContext{
uint8_t quant_table[256];
int qdiff_count;
int context_count;
uint8_t (*state)[64]; //FIXME 64
uint8_t (*state)[CONTEXT_SIZE];
uint8_t interlace_bit_state[2];
} PlaneContext;
......@@ -162,27 +164,13 @@ static inline int get_symbol(CABACContext *c, uint8_t *state){
}
}
#else
/**
* put
*/
static inline void put_symbol(CABACContext *c, uint8_t *state, int v, int is_signed){
int i;
#if 0
const int a= ABS(v);
const int e= av_log2(a+1);
put_cabac_u(c, state+0, e, 7, 6, 1); //0..6
if(e){
put_cabac(c, state+6 + e, v < 0); //7..13
for(i=; i<e; i++){
}
}
#else
// 0 1 2 3 4 5 6
// 0 1 2 3 4 5 6
// 0 0 1 3 6 10 15 21
if(v){
const int a= ABS(v);
const int e= av_log2(a);
......@@ -191,18 +179,15 @@ static inline void put_symbol(CABACContext *c, uint8_t *state, int v, int is_sig
put_cabac_u(c, state+1, e, 7, 6, 1); //1..7
if(e<7){
for(i=e-1; i>=0; i--){
static const int offset[7]= {14+0, 14+0, 14+1, 14+3, 14+6, 14+10, 14+15};
// put_cabac(c, state+14+e-i, (a>>i)&1); //14..20
put_cabac(c, state+offset[e]+i, (a>>i)&1); //14..34
static const int offset[7]= {15+0, 15+0, 15+1, 15+3, 15+6, 15+10, 15+11};
put_cabac(c, state+offset[e]+i, (a>>i)&1); //15..31
}
if(is_signed)
put_cabac(c, state+8 + e, v < 0); //8..14
}
}else{
put_cabac(c, state+0, 1);
}
#endif
}
static inline int get_symbol(CABACContext *c, uint8_t *state, int is_signed){
......@@ -217,8 +202,8 @@ static inline int get_symbol(CABACContext *c, uint8_t *state, int is_signed){
int a= 1<<e;
for(i=e-1; i>=0; i--){
static const int offset[7]= {14+0, 14+0, 14+1, 14+3, 14+6, 14+10, 14+15};
a += get_cabac(c, state+offset[e]+i)<<i; //14..34
static const int offset[7]= {15+0, 15+0, 15+1, 15+3, 15+6, 15+10, 15+11};
a += get_cabac(c, state+offset[e]+i)<<i; //14..31
}
if(is_signed && get_cabac(c, state+8 + e)) //8..14
......@@ -257,14 +242,14 @@ static void encode_plane(FFV1Context *s, uint8_t *src, int w, int h, int stride,
context= pred_diff[3+0][x-1] + 16*pred_diff[3-1][x+0];
else
context= pred_diff[3+0][x-1] + 16*pred_diff[3-1][x+0]
+ 16*16*to8[pred_diff[3-1][x+1]] + 16*16*8*to8[pred_diff[3-0][x-2]] + 16*16*8*8*to8[pred_diff[3-2][x+0]];
+ 16*16*to5[pred_diff[3-1][x+1]] + 16*16*5*to5[pred_diff[3-0][x-2]] + 16*16*5*5*to5[pred_diff[3-2][x+0]];
diff = (int8_t)(temp_src[0] - predict(s, temp_src, stride, x, y));
qdiff= p->quant_table[128+diff];
put_symbol(c, p->state[context], diff, 1);
pred_diff[3][x]= qdiff;
}
}
......@@ -273,7 +258,7 @@ static void encode_plane(FFV1Context *s, uint8_t *src, int w, int h, int stride,
static void write_quant_table(CABACContext *c, uint8_t *quant_table){
int last=0;
int i;
uint8_t state[64]={0};
uint8_t state[CONTEXT_SIZE]={0};
for(i=1; i<256 ; i++){
if(quant_table[i] != quant_table[i-1]){
......@@ -285,7 +270,7 @@ static void write_quant_table(CABACContext *c, uint8_t *quant_table){
}
static void write_header(FFV1Context *f){
uint8_t state[64]={0};
uint8_t state[CONTEXT_SIZE]={0};
int i;
CABACContext * const c= &f->c;
......@@ -306,7 +291,7 @@ static void write_header(FFV1Context *f){
static int common_init(AVCodecContext *avctx){
FFV1Context *s = avctx->priv_data;
int i, j, width, height;
int width, height;
s->avctx= avctx;
s->flags= avctx->flags;
......@@ -318,10 +303,6 @@ static int common_init(AVCodecContext *avctx){
assert(width && height);
for(i=0; i<s->plane_count; i++){
PlaneContext *p= &s->plane[i];
}
return 0;
}
......@@ -343,10 +324,10 @@ static int encode_init(AVCodecContext *avctx)
#if 1
p->context_count= 256;
p->state= av_malloc(64*p->context_count*sizeof(uint8_t));
p->state= av_malloc(CONTEXT_SIZE*p->context_count*sizeof(uint8_t));
#else
p->context_count= 16*16*8*8*8; //256*16;
p->state= av_malloc(64*p->context_count*sizeof(uint8_t));
p->context_count= 16*16*128 /*5*5*5*/;
p->state= av_malloc(CONTEXT_SIZE*p->context_count*sizeof(uint8_t));
#endif
}
......@@ -372,7 +353,7 @@ static int encode_init(AVCodecContext *avctx)
static void clear_state(FFV1Context *f){
int i;
int i, j;
for(i=0; i<f->plane_count; i++){
PlaneContext *p= &f->plane[i];
......@@ -380,7 +361,10 @@ static void clear_state(FFV1Context *f){
p->interlace_bit_state[0]= 0;
p->interlace_bit_state[1]= 0;
memset(p->state, 0, p->context_count*sizeof(uint8_t)*64);
for(j=0; j<p->context_count; j++){
memset(p->state[j], 0, sizeof(uint8_t)*CONTEXT_SIZE);
p->state[j][7] = 2*62;
}
}
}
......@@ -475,7 +459,7 @@ static void decode_plane(FFV1Context *s, uint8_t *src, int w, int h, int stride,
context= pred_diff[3+0][x-1] + 16*pred_diff[3-1][x+0];
else
context= pred_diff[3+0][x-1] + 16*pred_diff[3-1][x+0]
+ 16*16*to8[pred_diff[3-1][x+1]] + 16*16*8*to8[pred_diff[3-0][x-2]] + 16*16*8*8*to8[pred_diff[3-2][x+0]];
+ 16*16*to5[pred_diff[3-1][x+1]] + 16*16*5*to5[pred_diff[3-0][x-2]] + 16*16*5*5*to5[pred_diff[3-2][x+0]];
diff= get_symbol(c, p->state[context], 1);
......@@ -493,7 +477,7 @@ static void decode_plane(FFV1Context *s, uint8_t *src, int w, int h, int stride,
static int read_quant_table(CABACContext *c, uint8_t *quant_table){
int v;
int i=0;
uint8_t state[64]={0};
uint8_t state[CONTEXT_SIZE]={0};
for(v=0; i<256 ; v++){
int len= get_symbol(c, state, 0) + 1;
......@@ -511,7 +495,7 @@ static int read_quant_table(CABACContext *c, uint8_t *quant_table){
}
static int read_header(FFV1Context *f){
uint8_t state[64]={0};
uint8_t state[CONTEXT_SIZE]={0};
int i;
CABACContext * const c= &f->c;
......@@ -531,7 +515,7 @@ static int read_header(FFV1Context *f){
if(p->qdiff_count < 0) return -1;
if(!p->state)
p->state= av_malloc(64*p->context_count*sizeof(uint8_t));
p->state= av_malloc(CONTEXT_SIZE*p->context_count*sizeof(uint8_t));
}
return 0;
......@@ -654,7 +638,7 @@ AVCodec ffv1_decoder = {
NULL,
decode_end,
decode_frame,
/*CODEC_CAP_DR1 | CODEC_CAP_DRAW_HORIZ_BAND*/ 0,
CODEC_CAP_DR1 /*| CODEC_CAP_DRAW_HORIZ_BAND*/,
NULL
};
......
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment