/* * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 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:%d\n", 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: %d\n", 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 large\n"); 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 large\n"); 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:%d\n", 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; 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 supported\n"); 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=%d\n", 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 int common_end(AVCodecContext *avctx){ FFV1Context *s = avctx->priv_data; int i; for(i=0; i<s->plane_count; i++){ PlaneContext *p= &s->plane[i]; av_freep(&p->state); } 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:%d\n", 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 supported\n"); 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 colorspace\n"); return -1; } f->avctx->pix_fmt= PIX_FMT_RGBA32; }else{ av_log(f->avctx, AV_LOG_ERROR, "colorspace 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 || context_count > 32768){ av_log(f->avctx, AV_LOG_ERROR, "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); 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; if(read_header(f) < 0) return -1; clear_state(f); }else{ p->key_frame= 0; } if(!f->plane[0].state && !f->plane[0].vlc_state) return -1; p->reference= 0; if(avctx->get_buffer(avctx, p) < 0){ av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); return -1; } if(avctx->debug&FF_DEBUG_PICT_INFO) av_log(avctx, AV_LOG_ERROR, "keyframe:%d coder:%d\n", 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 stream\n"); //FIXME //printf("pos=%d\n", 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 frame\n"); }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, common_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, common_end, }; #endif