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FFmpeg/libavcodec/ffv1.c
Michael Niedermayer 11e659c203 golomb rice codes 
use gradients instead of prediction errors as context model
store independant quantization tables for each point
merge contexts with opposit sign

Originally committed as revision 1957 to svn://svn.ffmpeg.org/ffmpeg/trunk
2003-06-13 21:31:28 +00:00

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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];
uint8_t *cm = cropTbl + MAX_NEG_CROP;
const int gradient= cm[L + T - LT];
return mid_pred(L, gradient, 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 i;
if(v){
const int a= ABS(v);
const int e= av_log2(a);
put_cabac(c, state+0, 0);
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]= {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);
}
}
static inline int get_symbol(CABACContext *c, uint8_t *state, int is_signed){
int i;
if(get_cabac(c, state+0))
return 0;
else{
const int e= get_cabac_u(c, state+1, 7, 6, 1); //1..7
if(e<7){
int a= 1<<e;
for(i=e-1; i>=0; i--){
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
return -a;
else
return a;
}else
return -128;
}
}
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;
}
#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, 8, 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;
}
v= get_ur_golomb(gb, k, 8, 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 pred_diff_buffer[4][w+6]; //FIXME rema,e
uint8_t *pred_diff[4]= {pred_diff_buffer[0]+3, pred_diff_buffer[1]+3, pred_diff_buffer[2]+3, pred_diff_buffer[3]+3};
int run_index=0;
memset(pred_diff_buffer, 0, sizeof(pred_diff_buffer));
for(y=0; y<h; y++){
uint8_t *temp= pred_diff[0]; //FIXME try a normal buffer
int run_count=0;
int run_mode=0;
pred_diff[0]= pred_diff[1];
pred_diff[1]= pred_diff[2];
pred_diff[2]= pred_diff[3];
pred_diff[3]= temp;
pred_diff[3][-1]= pred_diff[2][0 ];
pred_diff[2][ w]= pred_diff[2][w-1];
for(x=0; x<w; x++){
uint8_t *temp_src= src + x + stride*y;
int diff, context;
context= get_context(s, pred_diff[3]+x, pred_diff[2]+x, pred_diff[1]+x);
diff= temp_src[0] - predict(pred_diff[3]+x, pred_diff[2]+x);
if(context < 0){
context = -context;
diff= -diff;
}
diff= (int8_t)diff;
if(s->ac)
put_symbol(c, p->state[context], diff, 1);
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);
}
pred_diff[3][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);
last= i;
}
}
put_symbol(c, state, i-last-1, 0);
}
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);
put_symbol(c, state, f->avctx->coder_type, 0);
put_symbol(c, state, 0, 0); //YUV cs type
put_cabac(c, state, 1); //chroma planes
put_symbol(c, state, f->chroma_h_shift, 0);
put_symbol(c, state, f->chroma_v_shift, 0);
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=3;
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], 2);
}
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 pred_diff_buffer[4][w+6];
uint8_t *pred_diff[4]= {pred_diff_buffer[0]+3, pred_diff_buffer[1]+3, pred_diff_buffer[2]+3, pred_diff_buffer[3]+3};
int run_index=0;
memset(pred_diff_buffer, 0, sizeof(pred_diff_buffer));
for(y=0; y<h; y++){
uint8_t *temp= pred_diff[0]; //FIXME try a normal buffer
int run_count=0;
int run_mode=0;
pred_diff[0]= pred_diff[1];
pred_diff[1]= pred_diff[2];
pred_diff[2]= pred_diff[3];
pred_diff[3]= temp;
pred_diff[3][-1]= pred_diff[2][0 ];
pred_diff[2][ w]= pred_diff[2][w-1];
for(x=0; x<w; x++){
uint8_t *temp_src= src + x + stride*y;
int diff, context, sign;
context= get_context(s, pred_diff[3] + x, pred_diff[2] + x, pred_diff[1] + x);
if(context < 0){
context= -context;
sign=1;
}else
sign=0;
if(s->ac)
diff= get_symbol(c, p->state[context], 1);
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
pred_diff[3][x]=
temp_src[0] = predict(pred_diff[3] + x, pred_diff[2] + 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) + 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);
f->ac= f->avctx->coder_type= get_symbol(c, state, 0);
get_symbol(c, state, 0); //YUV cs type
get_cabac(c, state); //no chroma = false
f->chroma_h_shift= get_symbol(c, state, 0);
f->chroma_v_shift= get_symbol(c, state, 0);
get_cabac(c, state); //transparency plane
f->plane_count= 3;
context_count=1;
for(i=0; i<5; i++){
context_count*= read_quant_table(c, f->quant_table[i], context_count);
}
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->reference= 0;
if(avctx->get_buffer(avctx, p) < 0){
fprintf(stderr, "get_buffer() failed\n");
return -1;
}
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;
}
if(avctx->debug&FF_DEBUG_PICT_INFO)
printf("keyframe:%d\n", p->key_frame);
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], 2);
}
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
};
AVCodec ffv1_encoder = {
"ffv1",
CODEC_TYPE_VIDEO,
CODEC_ID_FFV1,
sizeof(FFV1Context),
encode_init,
encode_frame,
encode_end,
};
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