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FFmpeg/libavcodec/ffv1.c
Michael Niedermayer 5e20f836b3 FFV1 codec (our very simple lossless intra only codec, compresses much better then huffyuv) 
Originally committed as revision 1939 to svn://svn.ffmpeg.org/ffmpeg/trunk
2003-06-09 02:24:51 +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"
#define MAX_PLANES 4
#if 0
#define DEFAULT_QDIFF_COUNT (9)
static const uint8_t default_quant_table[512]={
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3,
4,
5, 5, 6, 6, 6, 6, 7, 7, 7, 7, 7, 7, 7, 7, 8, 8,
8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
};
#else
#define DEFAULT_QDIFF_COUNT (16)
static const uint8_t default_quant_table[256]={
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 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,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
3, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 6, 7,
8,
9,10,11,11,12,12,12,12,13,13,13,13,13,13,13,13,
14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,
15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,
15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,
15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,
15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,
15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,
15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,
};
#endif
static const int to8[16]={
0,1,1,1,
1,2,2,3,
4,5,6,6,
7,7,7,7
};
typedef struct PlaneContext{
uint8_t quant_table[256];
int qdiff_count;
int context_count;
uint8_t (*state)[64]; //FIXME 64
uint8_t interlace_bit_state[2];
} PlaneContext;
typedef struct FFV1Context{
AVCodecContext *avctx;
CABACContext c;
int version;
int width, height;
int chroma_h_shift, chroma_v_shift;
int flags;
int picture_number;
AVFrame picture;
int plane_count;
PlaneContext plane[MAX_PLANES];
DSPContext dsp;
}FFV1Context;
//1.774215
static inline int predict(FFV1Context *s, uint8_t *src, int stride, int x, int y){
if(x && y){
// const int RT= src[+1-stride];
const int LT= src[-1-stride];
const int T= src[ -stride];
const int L = src[-1 ];
uint8_t *cm = cropTbl + MAX_NEG_CROP;
const int gradient= cm[L + T - LT];
// return gradient;
return mid_pred(L, gradient, T);
}else{
if(y){
return src[ -stride];
}else if(x){
return src[-1 ];
}else{
return 128;
}
}
}
#if 0
static inline void put_symbol(CABACContext, uint8_t *state, int v){
put_cabac_ueg(c, state, v, 32, 1, 4 , 32);
}
static inline int get_symbol(CABACContext, uint8_t *state){
return get_cabac_ueg(c, state, 32, 1, 4 , 32);
}
#elif 0
static inline void put_symbol(CABACContext *c, uint8_t *state, int v){
if(v==0)
put_cabac(c, state+0, 1);
else{
put_cabac(c, state+0, 0);
put_cabac(c, state+1, v<0);
if(v<0) state += 64;
put_cabac_ueg(c, state+2, ABS(v)-1, 32, 0, 4 , 32);
}
}
static inline int get_symbol(CABACContext *c, uint8_t *state){
if(get_cabac(c, state+0))
return 0;
else{
int sign= get_cabac(c, state+1);
if(sign)
return -1-get_cabac_ueg(c, state+66, 32, 0, 4 , 32);
else
return 1+get_cabac_ueg(c, state+2 , 32, 0, 4 , 32);
}
}
#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);
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]= {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
}
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){
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]= {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
}
if(is_signed && get_cabac(c, state+8 + e)) //8..14
return -a;
else
return a;
}else
return -128;
}
}
#endif
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];
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};
// uint8_t temp_buf[3*w], *temp= temp_buf + 3*w;
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
pred_diff[0]= pred_diff[1];
pred_diff[1]= pred_diff[2];
pred_diff[2]= pred_diff[3];
pred_diff[3]= temp;
for(x=0; x<w; x++){
uint8_t *temp_src= src + x + stride*y;
int diff, context, qdiff;
if(p->context_count == 256)
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]];
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;
}
}
}
static void write_quant_table(CABACContext *c, uint8_t *quant_table){
int last=0;
int i;
uint8_t state[64]={0};
for(i=1; i<256 ; 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[64]={0};
int i;
CABACContext * const c= &f->c;
put_symbol(c, state, f->version, 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<3; i++){ //FIXME chroma & trasparency decission
PlaneContext * const p= &f->plane[i];
put_symbol(c, state, av_log2(p->context_count), 0);
write_quant_table(c, p->quant_table);
}
}
static int common_init(AVCodecContext *avctx){
FFV1Context *s = avctx->priv_data;
int i, j, 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);
for(i=0; i<s->plane_count; i++){
PlaneContext *p= &s->plane[i];
}
return 0;
}
static int encode_init(AVCodecContext *avctx)
{
FFV1Context *s = avctx->priv_data;
int i;
common_init(avctx);
s->version=0;
s->plane_count=3;
for(i=0; i<s->plane_count; i++){
PlaneContext * const p= &s->plane[i];
memcpy(p->quant_table, default_quant_table, sizeof(uint8_t)*256);
p->qdiff_count= DEFAULT_QDIFF_COUNT;
#if 1
p->context_count= 256;
p->state= av_malloc(64*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));
#endif
}
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;
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;
memset(p->state, 0, p->context_count*sizeof(uint8_t)*64);
}
}
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;
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(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++;
return put_cabac_terminate(c, 1);
}
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};
// uint8_t temp_buf[3*w], *temp= temp_buf + 3*w;
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
pred_diff[0]= pred_diff[1];
pred_diff[1]= pred_diff[2];
pred_diff[2]= pred_diff[3];
pred_diff[3]= temp;
for(x=0; x<w; x++){
uint8_t *temp_src= src + x + stride*y;
int diff, context, qdiff;
if(p->context_count == 256)
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]];
diff= get_symbol(c, p->state[context], 1);
temp_src[0] = predict(s, temp_src, stride, x, y) + diff;
assert(diff>= -128 && diff <= 127);
qdiff= p->quant_table[128+diff];
pred_diff[3][x]= qdiff;
}
}
}
static int read_quant_table(CABACContext *c, uint8_t *quant_table){
int v;
int i=0;
uint8_t state[64]={0};
for(v=0; i<256 ; v++){
int len= get_symbol(c, state, 0) + 1;
if(len + i > 256) return -1;
while(len--){
quant_table[i++] = v;
//printf("%2d ",v);
//if(i%16==0) printf("\n");
}
}
return v;
}
static int read_header(FFV1Context *f){
uint8_t state[64]={0};
int i;
CABACContext * const c= &f->c;
f->version= 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;
for(i=0; i<f->plane_count; i++){
PlaneContext * const p= &f->plane[i];
p->context_count= 1<<get_symbol(c, state, 0);
p->qdiff_count= read_quant_table(c, p->quant_table);
if(p->qdiff_count < 0) return -1;
if(!p->state)
p->state= av_malloc(64*p->context_count*sizeof(uint8_t));
}
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(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);
bytes_read= get_cabac_terminate(c);
if(bytes_read ==0) printf("error at end of frame\n");
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*/ 0,
NULL
};
AVCodec ffv1_encoder = {
"ffv1",
CODEC_TYPE_VIDEO,
CODEC_ID_FFV1,
sizeof(FFV1Context),
encode_init,
encode_frame,
encode_end,
};
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