ffv1.c
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上传用户:wstnjxml
上传日期:2014-04-03
资源大小:7248k
文件大小:30k
源码类别:
Windows CE
开发平台:
C/C++
- /*
- * 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 (an experimental lossless codec)
- */
- #include "common.h"
- #include "bitstream.h"
- #include "avcodec.h"
- #include "dsputil.h"
- #include "rangecoder.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;
- RangeCoder 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];
- int run_index;
- int colorspace;
- DSPContext dsp;
- }FFV1Context;
- static always_inline int fold(int diff, int bits){
- if(bits==8)
- diff= (int8_t)diff;
- else{
- diff+= 1<<(bits-1);
- diff&=(1<<bits)-1;
- diff-= 1<<(bits-1);
- }
- return diff;
- }
- static inline int predict(int_fast16_t *src, int_fast16_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, int_fast16_t *src, int_fast16_t *last, int_fast16_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];
- }
- static inline void put_symbol(RangeCoder *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_rac(c, state+0, 0);
- assert(e<=9);
- for(i=0; i<e; i++){
- put_rac(c, state+1+i, 1); //1..10
- }
- put_rac(c, state+1+i, 0);
- for(i=e-1; i>=0; i--){
- put_rac(c, state+22+i, (a>>i)&1); //22..31
- }
- if(is_signed)
- put_rac(c, state+11 + e, v < 0); //11..21
- }else{
- put_rac(c, state+0, 1);
- }
- }
- static inline int get_symbol(RangeCoder *c, uint8_t *state, int is_signed){
- if(get_rac(c, state+0))
- return 0;
- else{
- int i, e, a;
- e= 0;
- while(get_rac(c, state+1 + e)){ //1..10
- e++;
- }
- assert(e<=9);
- a= 1;
- for(i=e-1; i>=0; i--){
- a += a + get_rac(c, state+22 + i); //22..31
- }
- if(is_signed && get_rac(c, state+11 + e)) //11..21
- return -a;
- else
- return a;
- }
- }
- 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 bits){
- int i, k, code;
- //printf("final: %d ", v);
- v = fold(v - state->bias, bits);
- 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
- //printf("v:%d/%d bias:%d error:%d drift:%d count:%d k:%dn", v, code, state->bias, state->error_sum, state->drift, state->count, k);
- set_sr_golomb(pb, code, k, 12, bits);
- update_vlc_state(state, v);
- }
- static inline int get_vlc_symbol(GetBitContext *gb, VlcState * const state, int bits){
- 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_sr_golomb(gb, k, 12, bits);
- //printf("v:%d bias:%d error:%d drift:%d count:%d k:%d", v, state->bias, state->error_sum, state->drift, state->count, k);
- #if 0 // JPEG LS
- if(k==0 && 2*state->drift <= - state->count) v ^= (-1);
- #else
- v ^= ((2*state->drift + state->count)>>31);
- #endif
- ret= fold(v + state->bias, bits);
- update_vlc_state(state, v);
- //printf("final: %dn", ret);
- return ret;
- }
- static inline int encode_line(FFV1Context *s, int w, int_fast16_t *sample[2], int plane_index, int bits){
- PlaneContext * const p= &s->plane[plane_index];
- RangeCoder * const c= &s->c;
- int x;
- int run_index= s->run_index;
- int run_count=0;
- int run_mode=0;
- if(s->ac){
- if(c->bytestream_end - c->bytestream < w*20){
- av_log(s->avctx, AV_LOG_ERROR, "encoded frame too largen");
- return -1;
- }
- }else{
- if(s->pb.buf_end - s->pb.buf - (put_bits_count(&s->pb)>>3) < w*4){
- av_log(s->avctx, AV_LOG_ERROR, "encoded frame too largen");
- return -1;
- }
- }
- for(x=0; x<w; x++){
- int diff, context;
- context= get_context(s, sample[0]+x, sample[1]+x, sample[2]+x);
- diff= sample[0][x] - predict(sample[0]+x, sample[1]+x);
- if(context < 0){
- context = -context;
- diff= -diff;
- }
- diff= fold(diff, bits);
- 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:%dn", run_count, run_index, run_mode, x, y, (int)put_bits_count(&s->pb));
- if(run_mode == 0)
- put_vlc_symbol(&s->pb, &p->vlc_state[context], diff, bits);
- }
- }
- 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);
- }
- s->run_index= run_index;
- return 0;
- }
- static void encode_plane(FFV1Context *s, uint8_t *src, int w, int h, int stride, int plane_index){
- int x,y,i;
- const int ring_size= s->avctx->context_model ? 3 : 2;
- int_fast16_t sample_buffer[ring_size][w+6], *sample[ring_size];
- s->run_index=0;
- memset(sample_buffer, 0, sizeof(sample_buffer));
- for(y=0; y<h; y++){
- for(i=0; i<ring_size; i++)
- sample[i]= sample_buffer[(h+i-y)%ring_size]+3;
- sample[0][-1]= sample[1][0 ];
- sample[1][ w]= sample[1][w-1];
- //{START_TIMER
- for(x=0; x<w; x++){
- sample[0][x]= src[x + stride*y];
- }
- encode_line(s, w, sample, plane_index, 8);
- //STOP_TIMER("encode line")}
- }
- }
- static void encode_rgb_frame(FFV1Context *s, uint32_t *src, int w, int h, int stride){
- int x, y, p, i;
- const int ring_size= s->avctx->context_model ? 3 : 2;
- int_fast16_t sample_buffer[3][ring_size][w+6], *sample[3][ring_size];
- s->run_index=0;
- memset(sample_buffer, 0, sizeof(sample_buffer));
- for(y=0; y<h; y++){
- for(i=0; i<ring_size; i++)
- for(p=0; p<3; p++)
- sample[p][i]= sample_buffer[p][(h+i-y)%ring_size]+3;
- for(x=0; x<w; x++){
- int v= src[x + stride*y];
- int b= v&0xFF;
- int g= (v>>8)&0xFF;
- int r= (v>>16)&0xFF;
- b -= g;
- r -= g;
- g += (b + r)>>2;
- b += 0x100;
- r += 0x100;
- // assert(g>=0 && b>=0 && r>=0);
- // assert(g<256 && b<512 && r<512);
- sample[0][0][x]= g;
- sample[1][0][x]= b;
- sample[2][0][x]= r;
- }
- for(p=0; p<3; p++){
- sample[p][0][-1]= sample[p][1][0 ];
- sample[p][1][ w]= sample[p][1][w-1];
- encode_line(s, w, sample[p], FFMIN(p, 1), 9);
- }
- }
- }
- static void write_quant_table(RangeCoder *c, int16_t *quant_table){
- int last=0;
- int i;
- uint8_t state[CONTEXT_SIZE];
- memset(state, 128, sizeof(state));
- 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];
- int i;
- RangeCoder * const c= &f->c;
- 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->colorspace, 0); //YUV cs type
- put_rac(c, state, 1); //chroma planes
- put_symbol(c, state, f->chroma_h_shift, 0);
- put_symbol(c, state, f->chroma_v_shift, 0);
- put_rac(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;
- if(avctx->strict_std_compliance >FF_COMPLIANCE_EXPERIMENTAL){
- av_log(avctx, AV_LOG_ERROR, "this codec is under development, files encoded with it may not be decodeable with future versions!!!n"
- "use vstrict=-2 / -strict -2 to use it anywayn");
- return -1;
- }
- 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:
- s->colorspace= 0;
- break;
- case PIX_FMT_RGBA32:
- s->colorspace= 1;
- break;
- default:
- av_log(avctx, AV_LOG_ERROR, "format not supportedn");
- return -1;
- }
- avcodec_get_chroma_sub_sample(avctx->pix_fmt, &s->chroma_h_shift, &s->chroma_v_shift);
- 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]= 128;
- p->interlace_bit_state[1]= 128;
- for(j=0; j<p->context_count; j++){
- if(f->ac){
- memset(p->state[j], 128, sizeof(uint8_t)*CONTEXT_SIZE);
- }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;
- RangeCoder * 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;
- uint8_t keystate=128;
- ff_init_range_encoder(c, buf, buf_size);
- // ff_init_cabac_states(c, ff_h264_lps_range, ff_h264_mps_state, ff_h264_lps_state, 64);
- ff_build_rac_states(c, 0.05*(1LL<<32), 256-8);
- *p = *pict;
- p->pict_type= FF_I_TYPE;
- if(avctx->gop_size==0 || f->picture_number % avctx->gop_size == 0){
- put_rac(c, &keystate, 1);
- p->key_frame= 1;
- write_header(f);
- clear_state(f);
- }else{
- put_rac(c, &keystate, 0);
- p->key_frame= 0;
- }
- if(!f->ac){
- used_count += ff_rac_terminate(c);
- //printf("pos=%dn", used_count);
- init_put_bits(&f->pb, buf + used_count, buf_size - used_count);
- }
- if(f->colorspace==0){
- 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);
- }else{
- encode_rgb_frame(f, (uint32_t*)(p->data[0]), width, height, p->linesize[0]/4);
- }
- emms_c();
- f->picture_number++;
- if(f->ac){
- return ff_rac_terminate(c);
- }else{
- flush_put_bits(&f->pb); //nicer padding FIXME
- return used_count + (put_bits_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 inline void decode_line(FFV1Context *s, int w, int_fast16_t *sample[2], int plane_index, int bits){
- PlaneContext * const p= &s->plane[plane_index];
- RangeCoder * const c= &s->c;
- int x;
- int run_count=0;
- int run_mode=0;
- int run_index= s->run_index;
- for(x=0; x<w; x++){
- 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);
- }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], bits);
- if(diff>=0) diff++;
- }else
- diff=0;
- }else
- diff= get_vlc_symbol(&s->gb, &p->vlc_state[context], bits);
- // printf("count:%d index:%d, mode:%d, x:%d y:%d pos:%dn", run_count, run_index, run_mode, x, y, get_bits_count(&s->gb));
- }
- if(sign) diff= -diff;
- sample[1][x]= (predict(sample[1] + x, sample[0] + x) + diff) & ((1<<bits)-1);
- }
- s->run_index= run_index;
- }
- static void decode_plane(FFV1Context *s, uint8_t *src, int w, int h, int stride, int plane_index){
- int x, y;
- int_fast16_t sample_buffer[2][w+6];
- int_fast16_t *sample[2]= {sample_buffer[0]+3, sample_buffer[1]+3};
- s->run_index=0;
- memset(sample_buffer, 0, sizeof(sample_buffer));
- for(y=0; y<h; y++){
- int_fast16_t *temp= sample[0]; //FIXME try a normal buffer
- sample[0]= sample[1];
- sample[1]= temp;
- sample[1][-1]= sample[0][0 ];
- sample[0][ w]= sample[0][w-1];
- //{START_TIMER
- decode_line(s, w, sample, plane_index, 8);
- for(x=0; x<w; x++){
- src[x + stride*y]= sample[1][x];
- }
- //STOP_TIMER("decode-line")}
- }
- }
- static void decode_rgb_frame(FFV1Context *s, uint32_t *src, int w, int h, int stride){
- int x, y, p;
- int_fast16_t sample_buffer[3][2][w+6];
- int_fast16_t *sample[3][2]= {
- {sample_buffer[0][0]+3, sample_buffer[0][1]+3},
- {sample_buffer[1][0]+3, sample_buffer[1][1]+3},
- {sample_buffer[2][0]+3, sample_buffer[2][1]+3}};
- s->run_index=0;
- memset(sample_buffer, 0, sizeof(sample_buffer));
- for(y=0; y<h; y++){
- for(p=0; p<3; p++){
- int_fast16_t *temp= sample[p][0]; //FIXME try a normal buffer
- sample[p][0]= sample[p][1];
- sample[p][1]= temp;
- sample[p][1][-1]= sample[p][0][0 ];
- sample[p][0][ w]= sample[p][0][w-1];
- decode_line(s, w, sample[p], FFMIN(p, 1), 9);
- }
- for(x=0; x<w; x++){
- int g= sample[0][1][x];
- int b= sample[1][1][x];
- int r= sample[2][1][x];
- // assert(g>=0 && b>=0 && r>=0);
- // assert(g<256 && b<512 && r<512);
- b -= 0x100;
- r -= 0x100;
- g -= (b + r)>>2;
- b += g;
- r += g;
- src[x + stride*y]= b + (g<<8) + (r<<16);
- }
- }
- }
- static int read_quant_table(RangeCoder *c, int16_t *quant_table, int scale){
- int v;
- int i=0;
- uint8_t state[CONTEXT_SIZE];
- memset(state, 128, sizeof(state));
- 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];
- int i, context_count;
- RangeCoder * const c= &f->c;
- memset(state, 128, sizeof(state));
- f->version= get_symbol(c, state, 0);
- f->ac= f->avctx->coder_type= get_symbol(c, state, 0);
- f->colorspace= get_symbol(c, state, 0); //YUV cs type
- get_rac(c, state); //no chroma = false
- f->chroma_h_shift= get_symbol(c, state, 0);
- f->chroma_v_shift= get_symbol(c, state, 0);
- get_rac(c, state); //transparency plane
- f->plane_count= 2;
- if(f->colorspace==0){
- 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 0x22: f->avctx->pix_fmt= PIX_FMT_YUV410P; break;
- default:
- av_log(f->avctx, AV_LOG_ERROR, "format not supportedn");
- return -1;
- }
- }else if(f->colorspace==1){
- if(f->chroma_h_shift || f->chroma_v_shift){
- av_log(f->avctx, AV_LOG_ERROR, "chroma subsampling not supported in this colorspacen");
- return -1;
- }
- f->avctx->pix_fmt= PIX_FMT_RGBA32;
- }else{
- av_log(f->avctx, AV_LOG_ERROR, "colorspace not supportedn");
- return -1;
- }
- //printf("%d %d %dn", 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 || context_count > 32768){
- av_log(f->avctx, AV_LOG_ERROR, "read_quant_table errorn");
- 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);
- return 0;
- }
- static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, uint8_t *buf, int buf_size){
- FFV1Context *f = avctx->priv_data;
- RangeCoder * const c= &f->c;
- const int width= f->width;
- const int height= f->height;
- AVFrame * const p= &f->picture;
- int bytes_read;
- uint8_t keystate= 128;
- AVFrame *picture = data;
- ff_init_range_decoder(c, buf, buf_size);
- ff_build_rac_states(c, 0.05*(1LL<<32), 256-8);
- p->pict_type= FF_I_TYPE; //FIXME I vs. P
- if(get_rac(c, &keystate)){
- 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){
- av_log(avctx, AV_LOG_ERROR, "get_buffer() failedn");
- return -1;
- }
- if(avctx->debug&FF_DEBUG_PICT_INFO)
- av_log(avctx, AV_LOG_ERROR, "keyframe:%d coder:%dn", p->key_frame, f->ac);
- if(!f->ac){
- bytes_read = c->bytestream - c->bytestream_start - 1;
- if(bytes_read ==0) av_log(avctx, AV_LOG_ERROR, "error at end of AC streamn"); //FIXME
- //printf("pos=%dn", bytes_read);
- init_get_bits(&f->gb, buf + bytes_read, buf_size - bytes_read);
- } else {
- bytes_read = 0; /* avoid warning */
- }
- if(f->colorspace==0){
- 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);
- }else{
- decode_rgb_frame(f, (uint32_t*)p->data[0], width, height, p->linesize[0]/4);
- }
- emms_c();
- f->picture_number++;
- *picture= *p;
- avctx->release_buffer(avctx, p); //FIXME
- *data_size = sizeof(AVFrame);
- if(f->ac){
- bytes_read= c->bytestream - c->bytestream_start - 1;
- if(bytes_read ==0) av_log(f->avctx, AV_LOG_ERROR, "error at end of framen");
- }else{
- bytes_read+= (get_bits_count(&f->gb)+7)/8;
- }
- return bytes_read;
- }
- AVCodec ffv1_decoder = {
- "ffv1",
- CODEC_TYPE_VIDEO,
- CODEC_ID_FFV1,
- sizeof(FFV1Context),
- decode_init,
- NULL,
- NULL,
- 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