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FFmpeg/libavcodec/ffv1.c
Michael Niedermayer d9e6a6c629 golomb rice code cleanup / simplify (~0.5% compression gain and slightly faster) 
jpegls style golomb rice coder

Originally committed as revision 2040 to svn://svn.ffmpeg.org/ffmpeg/trunk
2003-07-13 11:06:45 +00:00

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27 KiB
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/*
* FFV1 codec for libavcodec
*
* Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
/**
* @file ffv1.c
* FF Video Codec 1 (a experimental lossless codec)
*/
#include "common.h"
#include "avcodec.h"
#include "dsputil.h"
#include "cabac.h"
#include "golomb.h"
#define MAX_PLANES 4
#define CONTEXT_SIZE 32
static const int8_t quant3[256]={
0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, 0,
};
static const int8_t quant5[256]={
0, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,
-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,
-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,
-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,
-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,
-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,
-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,
-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-1,-1,-1,
};
static const int8_t quant7[256]={
0, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3,
3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,
-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,
-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,
-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,
-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,
-3,-3,-3,-3,-3,-3,-3,-3,-3,-2,-2,-2,-2,-2,-2,-2,
-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,
-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-1,-1,
};
static const int8_t quant9[256]={
0, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3,
3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,
-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,
-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,
-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,
-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,
-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,
-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-3,-3,-3,-3,
-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-2,-2,-2,-2,-1,-1,
};
static const int8_t quant11[256]={
0, 1, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4,
4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
4, 4, 4, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,
-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,
-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,
-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,
-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,
-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-4,-4,
-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,
-4,-4,-4,-4,-4,-3,-3,-3,-3,-3,-3,-3,-2,-2,-2,-1,
};
static const int8_t quant13[256]={
0, 1, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4,
4, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
5, 5, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,
-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,
-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,
-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,
-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-5,
-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,
-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,
-4,-4,-4,-4,-4,-4,-4,-4,-4,-3,-3,-3,-3,-2,-2,-1,
};
static const uint8_t log2_run[32]={
0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3,
4, 4, 5, 5, 6, 6, 7, 7,
8, 9,10,11,12,13,14,15,
};
typedef struct VlcState{
int16_t drift;
uint16_t error_sum;
int8_t bias;
uint8_t count;
} VlcState;
typedef struct PlaneContext{
int context_count;
uint8_t (*state)[CONTEXT_SIZE];
VlcState *vlc_state;
uint8_t interlace_bit_state[2];
} PlaneContext;
typedef struct FFV1Context{
AVCodecContext *avctx;
CABACContext c;
GetBitContext gb;
PutBitContext pb;
int version;
int width, height;
int chroma_h_shift, chroma_v_shift;
int flags;
int picture_number;
AVFrame picture;
int plane_count;
int ac; ///< 1-> CABAC 0-> golomb rice
PlaneContext plane[MAX_PLANES];
int16_t quant_table[5][256];
DSPContext dsp;
}FFV1Context;
static inline int predict(uint8_t *src, uint8_t *last){
const int LT= last[-1];
const int T= last[ 0];
const int L = src[-1];
return mid_pred(L, L + T - LT, T);
}
static inline int get_context(FFV1Context *f, uint8_t *src, uint8_t *last, uint8_t *last2){
const int LT= last[-1];
const int T= last[ 0];
const int RT= last[ 1];
const int L = src[-1];
if(f->quant_table[3][127]){
const int TT= last2[0];
const int LL= src[-2];
return f->quant_table[0][(L-LT) & 0xFF] + f->quant_table[1][(LT-T) & 0xFF] + f->quant_table[2][(T-RT) & 0xFF]
+f->quant_table[3][(LL-L) & 0xFF] + f->quant_table[4][(TT-T) & 0xFF];
}else
return f->quant_table[0][(L-LT) & 0xFF] + f->quant_table[1][(LT-T) & 0xFF] + f->quant_table[2][(T-RT) & 0xFF];
}
/**
* put
*/
static inline void put_symbol(CABACContext *c, uint8_t *state, int v, int is_signed, int max_exp){
int i;
if(v){
const int a= ABS(v);
const int e= av_log2(a);
put_cabac(c, state+0, 0);
for(i=0; i<e; i++){
put_cabac(c, state+1+i, 1); //1..8
}
if(e<max_exp){
put_cabac(c, state+1+i, 0); //1..8
for(i=e-1; i>=0; i--){
put_cabac(c, state+16+e+i, (a>>i)&1); //17..29
}
if(is_signed)
put_cabac(c, state+9 + e, v < 0); //9..16
}
}else{
put_cabac(c, state+0, 1);
}
}
static inline int get_symbol(CABACContext *c, uint8_t *state, int is_signed, int max_exp){
if(get_cabac(c, state+0))
return 0;
else{
int i, e;
for(e=0; e<max_exp; e++){
int a= 1<<e;
if(get_cabac(c, state + 1 + e)==0){ // 1..8
for(i=e-1; i>=0; i--){
a += get_cabac(c, state+16+e+i)<<i; //17..29
}
if(is_signed && get_cabac(c, state+9 + e)) //9..16
return -a;
else
return a;
}
}
return -(1<<e);
}
}
static inline void update_vlc_state(VlcState * const state, const int v){
int drift= state->drift;
int count= state->count;
state->error_sum += ABS(v);
drift += v;
if(count == 128){ //FIXME variable
count >>= 1;
drift >>= 1;
state->error_sum >>= 1;
}
count++;
if(drift <= -count){
if(state->bias > -128) state->bias--;
drift += count;
if(drift <= -count)
drift= -count + 1;
}else if(drift > 0){
if(state->bias < 127) state->bias++;
drift -= count;
if(drift > 0)
drift= 0;
}
state->drift= drift;
state->count= count;
}
static inline void put_vlc_symbol(PutBitContext *pb, VlcState * const state, int v){
int i, k, code;
//printf("final: %d ", v);
v = (int8_t)(v - state->bias);
i= state->count;
k=0;
while(i < state->error_sum){ //FIXME optimize
k++;
i += i;
}
assert(k<=8);
#if 0 // JPEG LS
if(k==0 && 2*state->drift <= - state->count) code= v ^ (-1);
else code= v;
#else
code= v ^ ((2*state->drift + state->count)>>31);
#endif
code = -2*code-1;
code^= (code>>31);
//printf("v:%d/%d bias:%d error:%d drift:%d count:%d k:%d\n", v, code, state->bias, state->error_sum, state->drift, state->count, k);
set_ur_golomb(pb, code, k, 12, 8);
update_vlc_state(state, v);
}
static inline int get_vlc_symbol(GetBitContext *gb, VlcState * const state){
int k, i, v, ret;
i= state->count;
k=0;
while(i < state->error_sum){ //FIXME optimize
k++;
i += i;
}
assert(k<=8);
v= get_ur_golomb(gb, k, 12, 8);
//printf("v:%d bias:%d error:%d drift:%d count:%d k:%d", v, state->bias, state->error_sum, state->drift, state->count, k);
v++;
if(v&1) v= (v>>1);
else v= -(v>>1);
#if 0 // JPEG LS
if(k==0 && 2*state->drift <= - state->count) v ^= (-1);
#else
v ^= ((2*state->drift + state->count)>>31);
#endif
ret= (int8_t)(v + state->bias);
update_vlc_state(state, v);
//printf("final: %d\n", ret);
return ret;
}
static void encode_plane(FFV1Context *s, uint8_t *src, int w, int h, int stride, int plane_index){
PlaneContext * const p= &s->plane[plane_index];
CABACContext * const c= &s->c;
int x,y;
uint8_t sample_buffer[2][w+6];
uint8_t *sample[2]= {sample_buffer[0]+3, sample_buffer[1]+3};
int run_index=0;
memset(sample_buffer, 0, sizeof(sample_buffer));
for(y=0; y<h; y++){
uint8_t *temp= sample[0]; //FIXME try a normal buffer
int run_count=0;
int run_mode=0;
sample[0]= sample[1];
sample[1]= temp;
sample[1][-1]= sample[0][0 ];
sample[0][ w]= sample[0][w-1];
for(x=0; x<w; x++){
uint8_t *temp_src= src + x + stride*y;
int diff, context;
context= get_context(s, sample[1]+x, sample[0]+x, sample[1]+x);
diff= temp_src[0] - predict(sample[1]+x, sample[0]+x);
if(context < 0){
context = -context;
diff= -diff;
}
diff= (int8_t)diff;
if(s->ac){
put_symbol(c, p->state[context], diff, 1, 7);
}else{
if(context == 0) run_mode=1;
if(run_mode){
if(diff){
while(run_count >= 1<<log2_run[run_index]){
run_count -= 1<<log2_run[run_index];
run_index++;
put_bits(&s->pb, 1, 1);
}
put_bits(&s->pb, 1 + log2_run[run_index], run_count);
if(run_index) run_index--;
run_count=0;
run_mode=0;
if(diff>0) diff--;
}else{
run_count++;
}
}
// printf("count:%d index:%d, mode:%d, x:%d y:%d pos:%d\n", run_count, run_index, run_mode, x, y, (int)get_bit_count(&s->pb));
if(run_mode == 0)
put_vlc_symbol(&s->pb, &p->vlc_state[context], diff);
}
sample[1][x]= temp_src[0];
}
if(run_mode){
while(run_count >= 1<<log2_run[run_index]){
run_count -= 1<<log2_run[run_index];
run_index++;
put_bits(&s->pb, 1, 1);
}
if(run_count)
put_bits(&s->pb, 1, 1);
}
}
}
static void write_quant_table(CABACContext *c, int16_t *quant_table){
int last=0;
int i;
uint8_t state[CONTEXT_SIZE]={0};
for(i=1; i<128 ; i++){
if(quant_table[i] != quant_table[i-1]){
put_symbol(c, state, i-last-1, 0, 7);
last= i;
}
}
put_symbol(c, state, i-last-1, 0, 7);
}
static void write_header(FFV1Context *f){
uint8_t state[CONTEXT_SIZE]={0};
int i;
CABACContext * const c= &f->c;
put_symbol(c, state, f->version, 0, 7);
put_symbol(c, state, f->avctx->coder_type, 0, 7);
put_symbol(c, state, 0, 0, 7); //YUV cs type
put_cabac(c, state, 1); //chroma planes
put_symbol(c, state, f->chroma_h_shift, 0, 7);
put_symbol(c, state, f->chroma_v_shift, 0, 7);
put_cabac(c, state, 0); //no transparency plane
for(i=0; i<5; i++)
write_quant_table(c, f->quant_table[i]);
}
static int common_init(AVCodecContext *avctx){
FFV1Context *s = avctx->priv_data;
int width, height;
s->avctx= avctx;
s->flags= avctx->flags;
dsputil_init(&s->dsp, avctx);
width= s->width= avctx->width;
height= s->height= avctx->height;
assert(width && height);
return 0;
}
static int encode_init(AVCodecContext *avctx)
{
FFV1Context *s = avctx->priv_data;
int i;
common_init(avctx);
s->version=0;
s->ac= avctx->coder_type;
s->plane_count=2;
for(i=0; i<256; i++){
s->quant_table[0][i]= quant11[i];
s->quant_table[1][i]= 11*quant11[i];
if(avctx->context_model==0){
s->quant_table[2][i]= 11*11*quant11[i];
s->quant_table[3][i]=
s->quant_table[4][i]=0;
}else{
s->quant_table[2][i]= 11*11*quant5 [i];
s->quant_table[3][i]= 5*11*11*quant5 [i];
s->quant_table[4][i]= 5*5*11*11*quant5 [i];
}
}
for(i=0; i<s->plane_count; i++){
PlaneContext * const p= &s->plane[i];
if(avctx->context_model==0){
p->context_count= (11*11*11+1)/2;
}else{
p->context_count= (11*11*5*5*5+1)/2;
}
if(s->ac){
if(!p->state) p->state= av_malloc(CONTEXT_SIZE*p->context_count*sizeof(uint8_t));
}else{
if(!p->vlc_state) p->vlc_state= av_malloc(p->context_count*sizeof(VlcState));
}
}
avctx->coded_frame= &s->picture;
switch(avctx->pix_fmt){
case PIX_FMT_YUV444P:
case PIX_FMT_YUV422P:
case PIX_FMT_YUV420P:
case PIX_FMT_YUV411P:
case PIX_FMT_YUV410P:
avcodec_get_chroma_sub_sample(avctx->pix_fmt, &s->chroma_h_shift, &s->chroma_v_shift);
break;
default:
fprintf(stderr, "format not supported\n");
return -1;
}
s->picture_number=0;
return 0;
}
static void clear_state(FFV1Context *f){
int i, j;
for(i=0; i<f->plane_count; i++){
PlaneContext *p= &f->plane[i];
p->interlace_bit_state[0]= 0;
p->interlace_bit_state[1]= 0;
for(j=0; j<p->context_count; j++){
if(f->ac){
memset(p->state[j], 0, sizeof(uint8_t)*CONTEXT_SIZE);
p->state[j][7] = 2*62;
}else{
p->vlc_state[j].drift= 0;
p->vlc_state[j].error_sum= 4; //FFMAX((RANGE + 32)/64, 2);
p->vlc_state[j].bias= 0;
p->vlc_state[j].count= 1;
}
}
}
}
static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){
FFV1Context *f = avctx->priv_data;
CABACContext * const c= &f->c;
AVFrame *pict = data;
const int width= f->width;
const int height= f->height;
AVFrame * const p= &f->picture;
int used_count= 0;
if(avctx->strict_std_compliance >= 0){
printf("this codec is under development, files encoded with it wont be decodeable with future versions!!!\n"
"use vstrict=-1 to use it anyway\n");
return -1;
}
ff_init_cabac_encoder(c, buf, buf_size);
ff_init_cabac_states(c, ff_h264_lps_range, ff_h264_mps_state, ff_h264_lps_state, 64);
*p = *pict;
p->pict_type= FF_I_TYPE;
if(avctx->gop_size==0 || f->picture_number % avctx->gop_size == 0){
put_cabac_bypass(c, 1);
p->key_frame= 1;
write_header(f);
clear_state(f);
}else{
put_cabac_bypass(c, 0);
p->key_frame= 0;
}
if(!f->ac){
used_count += put_cabac_terminate(c, 1);
//printf("pos=%d\n", used_count);
init_put_bits(&f->pb, buf + used_count, buf_size - used_count, NULL, NULL);
}
if(1){
const int chroma_width = -((-width )>>f->chroma_h_shift);
const int chroma_height= -((-height)>>f->chroma_v_shift);
encode_plane(f, p->data[0], width, height, p->linesize[0], 0);
encode_plane(f, p->data[1], chroma_width, chroma_height, p->linesize[1], 1);
encode_plane(f, p->data[2], chroma_width, chroma_height, p->linesize[2], 1);
}
emms_c();
f->picture_number++;
if(f->ac){
return put_cabac_terminate(c, 1);
}else{
flush_put_bits(&f->pb); //nicer padding FIXME
return used_count + (get_bit_count(&f->pb)+7)/8;
}
}
static void common_end(FFV1Context *s){
int i;
for(i=0; i<s->plane_count; i++){
PlaneContext *p= &s->plane[i];
av_freep(&p->state);
}
}
static int encode_end(AVCodecContext *avctx)
{
FFV1Context *s = avctx->priv_data;
common_end(s);
return 0;
}
static void decode_plane(FFV1Context *s, uint8_t *src, int w, int h, int stride, int plane_index){
PlaneContext * const p= &s->plane[plane_index];
CABACContext * const c= &s->c;
int x,y;
uint8_t sample_buffer[2][w+6];
uint8_t *sample[2]= {sample_buffer[0]+3, sample_buffer[1]+3};
int run_index=0;
memset(sample_buffer, 0, sizeof(sample_buffer));
for(y=0; y<h; y++){
uint8_t *temp= sample[0]; //FIXME try a normal buffer
int run_count=0;
int run_mode=0;
sample[0]= sample[1];
sample[1]= temp;
sample[1][-1]= sample[0][0 ];
sample[0][ w]= sample[0][w-1];
for(x=0; x<w; x++){
uint8_t *temp_src= src + x + stride*y;
int diff, context, sign;
context= get_context(s, sample[1] + x, sample[0] + x, sample[1] + x);
if(context < 0){
context= -context;
sign=1;
}else
sign=0;
if(s->ac)
diff= get_symbol(c, p->state[context], 1, 7);
else{
if(context == 0 && run_mode==0) run_mode=1;
if(run_mode){
if(run_count==0 && run_mode==1){
if(get_bits1(&s->gb)){
run_count = 1<<log2_run[run_index];
if(x + run_count <= w) run_index++;
}else{
if(log2_run[run_index]) run_count = get_bits(&s->gb, log2_run[run_index]);
else run_count=0;
if(run_index) run_index--;
run_mode=2;
}
}
run_count--;
if(run_count < 0){
run_mode=0;
run_count=0;
diff= get_vlc_symbol(&s->gb, &p->vlc_state[context]);
if(diff>=0) diff++;
}else
diff=0;
}else
diff= get_vlc_symbol(&s->gb, &p->vlc_state[context]);
// printf("count:%d index:%d, mode:%d, x:%d y:%d pos:%d\n", run_count, run_index, run_mode, x, y, get_bits_count(&s->gb));
}
if(sign) diff= (int8_t)(-diff); //FIXME remove cast
sample[1][x]=
temp_src[0] = predict(sample[1] + x, sample[0] + x) + diff;
assert(diff>= -128 && diff <= 127);
}
}
}
static int read_quant_table(CABACContext *c, int16_t *quant_table, int scale){
int v;
int i=0;
uint8_t state[CONTEXT_SIZE]={0};
for(v=0; i<128 ; v++){
int len= get_symbol(c, state, 0, 7) + 1;
if(len + i > 128) return -1;
while(len--){
quant_table[i] = scale*v;
i++;
//printf("%2d ",v);
//if(i%16==0) printf("\n");
}
}
for(i=1; i<128; i++){
quant_table[256-i]= -quant_table[i];
}
quant_table[128]= -quant_table[127];
return 2*v - 1;
}
static int read_header(FFV1Context *f){
uint8_t state[CONTEXT_SIZE]={0};
int i, context_count;
CABACContext * const c= &f->c;
f->version= get_symbol(c, state, 0, 7);
f->ac= f->avctx->coder_type= get_symbol(c, state, 0, 7);
get_symbol(c, state, 0, 7); //YUV cs type
get_cabac(c, state); //no chroma = false
f->chroma_h_shift= get_symbol(c, state, 0, 7);
f->chroma_v_shift= get_symbol(c, state, 0, 7);
get_cabac(c, state); //transparency plane
f->plane_count= 2;
switch(16*f->chroma_h_shift + f->chroma_v_shift){
case 0x00: f->avctx->pix_fmt= PIX_FMT_YUV444P; break;
case 0x10: f->avctx->pix_fmt= PIX_FMT_YUV422P; break;
case 0x11: f->avctx->pix_fmt= PIX_FMT_YUV420P; break;
case 0x20: f->avctx->pix_fmt= PIX_FMT_YUV411P; break;
case 0x33: f->avctx->pix_fmt= PIX_FMT_YUV410P; break;
default:
fprintf(stderr, "format not supported\n");
return -1;
}
//printf("%d %d %d\n", f->chroma_h_shift, f->chroma_v_shift,f->avctx->pix_fmt);
context_count=1;
for(i=0; i<5; i++){
context_count*= read_quant_table(c, f->quant_table[i], context_count);
if(context_count < 0){
printf("read_quant_table error\n");
return -1;
}
}
context_count= (context_count+1)/2;
for(i=0; i<f->plane_count; i++){
PlaneContext * const p= &f->plane[i];
p->context_count= context_count;
if(f->ac){
if(!p->state) p->state= av_malloc(CONTEXT_SIZE*p->context_count*sizeof(uint8_t));
}else{
if(!p->vlc_state) p->vlc_state= av_malloc(p->context_count*sizeof(VlcState));
}
}
return 0;
}
static int decode_init(AVCodecContext *avctx)
{
// FFV1Context *s = avctx->priv_data;
common_init(avctx);
#if 0
switch(s->bitstream_bpp){
case 12:
avctx->pix_fmt = PIX_FMT_YUV420P;
break;
case 16:
avctx->pix_fmt = PIX_FMT_YUV422P;
break;
case 24:
case 32:
if(s->bgr32){
avctx->pix_fmt = PIX_FMT_RGBA32;
}else{
avctx->pix_fmt = PIX_FMT_BGR24;
}
break;
default:
assert(0);
}
#endif
return 0;
}
static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, uint8_t *buf, int buf_size){
FFV1Context *f = avctx->priv_data;
CABACContext * const c= &f->c;
const int width= f->width;
const int height= f->height;
AVFrame * const p= &f->picture;
int bytes_read;
AVFrame *picture = data;
*data_size = 0;
/* no supplementary picture */
if (buf_size == 0)
return 0;
ff_init_cabac_decoder(c, buf, buf_size);
ff_init_cabac_states(c, ff_h264_lps_range, ff_h264_mps_state, ff_h264_lps_state, 64);
p->pict_type= FF_I_TYPE; //FIXME I vs. P
if(get_cabac_bypass(c)){
p->key_frame= 1;
read_header(f);
clear_state(f);
}else{
p->key_frame= 0;
}
p->reference= 0;
if(avctx->get_buffer(avctx, p) < 0){
fprintf(stderr, "get_buffer() failed\n");
return -1;
}
if(avctx->debug&FF_DEBUG_PICT_INFO)
printf("keyframe:%d coder:%d\n", p->key_frame, f->ac);
if(!f->ac){
bytes_read = get_cabac_terminate(c);
if(bytes_read ==0) printf("error at end of AC stream\n");
//printf("pos=%d\n", bytes_read);
init_get_bits(&f->gb, buf + bytes_read, buf_size - bytes_read);
}
if(1){
const int chroma_width = -((-width )>>f->chroma_h_shift);
const int chroma_height= -((-height)>>f->chroma_v_shift);
decode_plane(f, p->data[0], width, height, p->linesize[0], 0);
decode_plane(f, p->data[1], chroma_width, chroma_height, p->linesize[1], 1);
decode_plane(f, p->data[2], chroma_width, chroma_height, p->linesize[2], 1);
}
emms_c();
f->picture_number++;
*picture= *p;
avctx->release_buffer(avctx, p); //FIXME
*data_size = sizeof(AVFrame);
if(f->ac){
bytes_read= get_cabac_terminate(c);
if(bytes_read ==0) printf("error at end of frame\n");
}else{
bytes_read+= (get_bits_count(&f->gb)+7)/8;
}
return bytes_read;
}
static int decode_end(AVCodecContext *avctx)
{
FFV1Context *s = avctx->priv_data;
int i;
if(avctx->get_buffer == avcodec_default_get_buffer){
for(i=0; i<4; i++){
av_freep(&s->picture.base[i]);
s->picture.data[i]= NULL;
}
av_freep(&s->picture.opaque);
}
return 0;
}
AVCodec ffv1_decoder = {
"ffv1",
CODEC_TYPE_VIDEO,
CODEC_ID_FFV1,
sizeof(FFV1Context),
decode_init,
NULL,
decode_end,
decode_frame,
CODEC_CAP_DR1 /*| CODEC_CAP_DRAW_HORIZ_BAND*/,
NULL
};
#ifdef CONFIG_ENCODERS
AVCodec ffv1_encoder = {
"ffv1",
CODEC_TYPE_VIDEO,
CODEC_ID_FFV1,
sizeof(FFV1Context),
encode_init,
encode_frame,
encode_end,
};
#endif
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