2 * FFV1 codec for libavcodec
4 * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24 * FF Video Codec 1 (an experimental lossless codec)
28 #include "bitstream.h"
31 #include "rangecoder.h"
35 #define CONTEXT_SIZE 32
37 static const int8_t quant3[256]={
38 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
39 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
40 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
41 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
42 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
43 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
44 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
45 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
46 -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
47 -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
48 -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
49 -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
50 -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
51 -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
52 -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
53 -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, 0,
55 static const int8_t quant5[256]={
56 0, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
57 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
58 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
59 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
60 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
61 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
62 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
63 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
64 -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,
65 -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,
66 -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,
67 -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,
68 -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,
69 -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,
70 -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,
71 -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-1,-1,-1,
73 static const int8_t quant7[256]={
74 0, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
75 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
76 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3,
77 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
78 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
79 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
80 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
81 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
82 -3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,
83 -3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,
84 -3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,
85 -3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,
86 -3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,
87 -3,-3,-3,-3,-3,-3,-3,-3,-3,-2,-2,-2,-2,-2,-2,-2,
88 -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,
89 -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-1,-1,
91 static const int8_t quant9[256]={
92 0, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3,
93 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
94 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
95 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
96 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
97 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
98 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
99 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
100 -4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,
101 -4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,
102 -4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,
103 -4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,
104 -4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,
105 -4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,
106 -4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-3,-3,-3,-3,
107 -3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-2,-2,-2,-2,-1,-1,
109 static const int8_t quant11[256]={
110 0, 1, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4,
111 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
112 4, 4, 4, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
113 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
114 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
115 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
116 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
117 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
118 -5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,
119 -5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,
120 -5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,
121 -5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,
122 -5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,
123 -5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-4,-4,
124 -4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,
125 -4,-4,-4,-4,-4,-3,-3,-3,-3,-3,-3,-3,-2,-2,-2,-1,
127 static const int8_t quant13[256]={
128 0, 1, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4,
129 4, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
130 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
131 5, 5, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
132 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
133 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
134 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
135 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
136 -6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,
137 -6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,
138 -6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,
139 -6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,
140 -6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-5,
141 -5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,
142 -5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,
143 -4,-4,-4,-4,-4,-4,-4,-4,-4,-3,-3,-3,-3,-2,-2,-1,
146 static const uint8_t log2_run[32]={
147 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3,
148 4, 4, 5, 5, 6, 6, 7, 7,
149 8, 9,10,11,12,13,14,15,
152 typedef struct VlcState{
159 typedef struct PlaneContext{
161 uint8_t (*state)[CONTEXT_SIZE];
163 uint8_t interlace_bit_state[2];
166 typedef struct FFV1Context{
167 AVCodecContext *avctx;
173 int chroma_h_shift, chroma_v_shift;
178 int ac; ///< 1-> CABAC 0-> golomb rice
179 PlaneContext plane[MAX_PLANES];
180 int16_t quant_table[5][256];
187 static always_inline int fold(int diff, int bits){
199 static inline int predict(int_fast16_t *src, int_fast16_t *last){
200 const int LT= last[-1];
201 const int T= last[ 0];
202 const int L = src[-1];
204 return mid_pred(L, L + T - LT, T);
207 static inline int get_context(FFV1Context *f, int_fast16_t *src, int_fast16_t *last, int_fast16_t *last2){
208 const int LT= last[-1];
209 const int T= last[ 0];
210 const int RT= last[ 1];
211 const int L = src[-1];
213 if(f->quant_table[3][127]){
214 const int TT= last2[0];
215 const int LL= src[-2];
216 return f->quant_table[0][(L-LT) & 0xFF] + f->quant_table[1][(LT-T) & 0xFF] + f->quant_table[2][(T-RT) & 0xFF]
217 +f->quant_table[3][(LL-L) & 0xFF] + f->quant_table[4][(TT-T) & 0xFF];
219 return f->quant_table[0][(L-LT) & 0xFF] + f->quant_table[1][(LT-T) & 0xFF] + f->quant_table[2][(T-RT) & 0xFF];
222 static inline void put_symbol(RangeCoder *c, uint8_t *state, int v, int is_signed){
227 const int e= av_log2(a);
228 put_rac(c, state+0, 0);
233 put_rac(c, state+1+i, 1); //1..10
235 put_rac(c, state+1+i, 0);
237 for(i=e-1; i>=0; i--){
238 put_rac(c, state+22+i, (a>>i)&1); //22..31
242 put_rac(c, state+11 + e, v < 0); //11..21
244 put_rac(c, state+0, 1);
248 static inline int get_symbol(RangeCoder *c, uint8_t *state, int is_signed){
249 if(get_rac(c, state+0))
254 while(get_rac(c, state+1 + e)){ //1..10
260 for(i=e-1; i>=0; i--){
261 a += a + get_rac(c, state+22 + i); //22..31
264 if(is_signed && get_rac(c, state+11 + e)) //11..21
271 static inline void update_vlc_state(VlcState * const state, const int v){
272 int drift= state->drift;
273 int count= state->count;
274 state->error_sum += ABS(v);
277 if(count == 128){ //FIXME variable
280 state->error_sum >>= 1;
285 if(state->bias > -128) state->bias--;
291 if(state->bias < 127) state->bias++;
302 static inline void put_vlc_symbol(PutBitContext *pb, VlcState * const state, int v, int bits){
304 //printf("final: %d ", v);
305 v = fold(v - state->bias, bits);
309 while(i < state->error_sum){ //FIXME optimize
317 if(k==0 && 2*state->drift <= - state->count) code= v ^ (-1);
320 code= v ^ ((2*state->drift + state->count)>>31);
323 //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);
324 set_sr_golomb(pb, code, k, 12, bits);
326 update_vlc_state(state, v);
329 static inline int get_vlc_symbol(GetBitContext *gb, VlcState * const state, int bits){
334 while(i < state->error_sum){ //FIXME optimize
341 v= get_sr_golomb(gb, k, 12, bits);
342 //printf("v:%d bias:%d error:%d drift:%d count:%d k:%d", v, state->bias, state->error_sum, state->drift, state->count, k);
345 if(k==0 && 2*state->drift <= - state->count) v ^= (-1);
347 v ^= ((2*state->drift + state->count)>>31);
350 ret= fold(v + state->bias, bits);
352 update_vlc_state(state, v);
353 //printf("final: %d\n", ret);
357 static inline int encode_line(FFV1Context *s, int w, int_fast16_t *sample[2], int plane_index, int bits){
358 PlaneContext * const p= &s->plane[plane_index];
359 RangeCoder * const c= &s->c;
361 int run_index= s->run_index;
366 if(c->bytestream_end - c->bytestream < w*20){
367 av_log(s->avctx, AV_LOG_ERROR, "encoded frame too large\n");
371 if(s->pb.buf_end - s->pb.buf - (put_bits_count(&s->pb)>>3) < w*4){
372 av_log(s->avctx, AV_LOG_ERROR, "encoded frame too large\n");
380 context= get_context(s, sample[0]+x, sample[1]+x, sample[2]+x);
381 diff= sample[0][x] - predict(sample[0]+x, sample[1]+x);
388 diff= fold(diff, bits);
391 put_symbol(c, p->state[context], diff, 1);
393 if(context == 0) run_mode=1;
398 while(run_count >= 1<<log2_run[run_index]){
399 run_count -= 1<<log2_run[run_index];
401 put_bits(&s->pb, 1, 1);
404 put_bits(&s->pb, 1 + log2_run[run_index], run_count);
405 if(run_index) run_index--;
414 // 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));
417 put_vlc_symbol(&s->pb, &p->vlc_state[context], diff, bits);
421 while(run_count >= 1<<log2_run[run_index]){
422 run_count -= 1<<log2_run[run_index];
424 put_bits(&s->pb, 1, 1);
428 put_bits(&s->pb, 1, 1);
430 s->run_index= run_index;
435 static void encode_plane(FFV1Context *s, uint8_t *src, int w, int h, int stride, int plane_index){
437 const int ring_size= s->avctx->context_model ? 3 : 2;
438 int_fast16_t sample_buffer[ring_size][w+6], *sample[ring_size];
441 memset(sample_buffer, 0, sizeof(sample_buffer));
444 for(i=0; i<ring_size; i++)
445 sample[i]= sample_buffer[(h+i-y)%ring_size]+3;
447 sample[0][-1]= sample[1][0 ];
448 sample[1][ w]= sample[1][w-1];
451 sample[0][x]= src[x + stride*y];
453 encode_line(s, w, sample, plane_index, 8);
454 //STOP_TIMER("encode line")}
458 static void encode_rgb_frame(FFV1Context *s, uint32_t *src, int w, int h, int stride){
460 const int ring_size= s->avctx->context_model ? 3 : 2;
461 int_fast16_t sample_buffer[3][ring_size][w+6], *sample[3][ring_size];
464 memset(sample_buffer, 0, sizeof(sample_buffer));
467 for(i=0; i<ring_size; i++)
469 sample[p][i]= sample_buffer[p][(h+i-y)%ring_size]+3;
472 int v= src[x + stride*y];
483 // assert(g>=0 && b>=0 && r>=0);
484 // assert(g<256 && b<512 && r<512);
490 sample[p][0][-1]= sample[p][1][0 ];
491 sample[p][1][ w]= sample[p][1][w-1];
492 encode_line(s, w, sample[p], FFMIN(p, 1), 9);
497 static void write_quant_table(RangeCoder *c, int16_t *quant_table){
500 uint8_t state[CONTEXT_SIZE];
501 memset(state, 128, sizeof(state));
503 for(i=1; i<128 ; i++){
504 if(quant_table[i] != quant_table[i-1]){
505 put_symbol(c, state, i-last-1, 0);
509 put_symbol(c, state, i-last-1, 0);
512 static void write_header(FFV1Context *f){
513 uint8_t state[CONTEXT_SIZE];
515 RangeCoder * const c= &f->c;
517 memset(state, 128, sizeof(state));
519 put_symbol(c, state, f->version, 0);
520 put_symbol(c, state, f->avctx->coder_type, 0);
521 put_symbol(c, state, f->colorspace, 0); //YUV cs type
522 put_rac(c, state, 1); //chroma planes
523 put_symbol(c, state, f->chroma_h_shift, 0);
524 put_symbol(c, state, f->chroma_v_shift, 0);
525 put_rac(c, state, 0); //no transparency plane
528 write_quant_table(c, f->quant_table[i]);
531 static int common_init(AVCodecContext *avctx){
532 FFV1Context *s = avctx->priv_data;
536 s->flags= avctx->flags;
538 dsputil_init(&s->dsp, avctx);
540 width= s->width= avctx->width;
541 height= s->height= avctx->height;
543 assert(width && height);
548 static int encode_init(AVCodecContext *avctx)
550 FFV1Context *s = avctx->priv_data;
553 if(avctx->strict_std_compliance >= 0){
554 av_log(avctx, AV_LOG_ERROR, "this codec is under development, files encoded with it wont be decodeable with future versions!!!\n"
555 "use vstrict=-1 to use it anyway\n");
562 s->ac= avctx->coder_type;
565 for(i=0; i<256; i++){
566 s->quant_table[0][i]= quant11[i];
567 s->quant_table[1][i]= 11*quant11[i];
568 if(avctx->context_model==0){
569 s->quant_table[2][i]= 11*11*quant11[i];
570 s->quant_table[3][i]=
571 s->quant_table[4][i]=0;
573 s->quant_table[2][i]= 11*11*quant5 [i];
574 s->quant_table[3][i]= 5*11*11*quant5 [i];
575 s->quant_table[4][i]= 5*5*11*11*quant5 [i];
579 for(i=0; i<s->plane_count; i++){
580 PlaneContext * const p= &s->plane[i];
582 if(avctx->context_model==0){
583 p->context_count= (11*11*11+1)/2;
585 p->context_count= (11*11*5*5*5+1)/2;
589 if(!p->state) p->state= av_malloc(CONTEXT_SIZE*p->context_count*sizeof(uint8_t));
591 if(!p->vlc_state) p->vlc_state= av_malloc(p->context_count*sizeof(VlcState));
595 avctx->coded_frame= &s->picture;
596 switch(avctx->pix_fmt){
597 case PIX_FMT_YUV444P:
598 case PIX_FMT_YUV422P:
599 case PIX_FMT_YUV420P:
600 case PIX_FMT_YUV411P:
601 case PIX_FMT_YUV410P:
608 av_log(avctx, AV_LOG_ERROR, "format not supported\n");
611 avcodec_get_chroma_sub_sample(avctx->pix_fmt, &s->chroma_h_shift, &s->chroma_v_shift);
619 static void clear_state(FFV1Context *f){
622 for(i=0; i<f->plane_count; i++){
623 PlaneContext *p= &f->plane[i];
625 p->interlace_bit_state[0]= 128;
626 p->interlace_bit_state[1]= 128;
628 for(j=0; j<p->context_count; j++){
630 memset(p->state[j], 128, sizeof(uint8_t)*CONTEXT_SIZE);
632 p->vlc_state[j].drift= 0;
633 p->vlc_state[j].error_sum= 4; //FFMAX((RANGE + 32)/64, 2);
634 p->vlc_state[j].bias= 0;
635 p->vlc_state[j].count= 1;
641 static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){
642 FFV1Context *f = avctx->priv_data;
643 RangeCoder * const c= &f->c;
644 AVFrame *pict = data;
645 const int width= f->width;
646 const int height= f->height;
647 AVFrame * const p= &f->picture;
649 uint8_t keystate=128;
651 ff_init_range_encoder(c, buf, buf_size);
652 // ff_init_cabac_states(c, ff_h264_lps_range, ff_h264_mps_state, ff_h264_lps_state, 64);
653 ff_build_rac_states(c, 0.05*(1LL<<32), 256-8);
656 p->pict_type= FF_I_TYPE;
658 if(avctx->gop_size==0 || f->picture_number % avctx->gop_size == 0){
659 put_rac(c, &keystate, 1);
664 put_rac(c, &keystate, 0);
669 used_count += ff_rac_terminate(c);
670 //printf("pos=%d\n", used_count);
671 init_put_bits(&f->pb, buf + used_count, buf_size - used_count);
674 if(f->colorspace==0){
675 const int chroma_width = -((-width )>>f->chroma_h_shift);
676 const int chroma_height= -((-height)>>f->chroma_v_shift);
678 encode_plane(f, p->data[0], width, height, p->linesize[0], 0);
680 encode_plane(f, p->data[1], chroma_width, chroma_height, p->linesize[1], 1);
681 encode_plane(f, p->data[2], chroma_width, chroma_height, p->linesize[2], 1);
683 encode_rgb_frame(f, (uint32_t*)(p->data[0]), width, height, p->linesize[0]/4);
690 return ff_rac_terminate(c);
692 flush_put_bits(&f->pb); //nicer padding FIXME
693 return used_count + (put_bits_count(&f->pb)+7)/8;
697 static void common_end(FFV1Context *s){
700 for(i=0; i<s->plane_count; i++){
701 PlaneContext *p= &s->plane[i];
707 static int encode_end(AVCodecContext *avctx)
709 FFV1Context *s = avctx->priv_data;
716 static inline void decode_line(FFV1Context *s, int w, int_fast16_t *sample[2], int plane_index, int bits){
717 PlaneContext * const p= &s->plane[plane_index];
718 RangeCoder * const c= &s->c;
722 int run_index= s->run_index;
725 int diff, context, sign;
727 context= get_context(s, sample[1] + x, sample[0] + x, sample[1] + x);
736 diff= get_symbol(c, p->state[context], 1);
738 if(context == 0 && run_mode==0) run_mode=1;
741 if(run_count==0 && run_mode==1){
742 if(get_bits1(&s->gb)){
743 run_count = 1<<log2_run[run_index];
744 if(x + run_count <= w) run_index++;
746 if(log2_run[run_index]) run_count = get_bits(&s->gb, log2_run[run_index]);
748 if(run_index) run_index--;
756 diff= get_vlc_symbol(&s->gb, &p->vlc_state[context], bits);
761 diff= get_vlc_symbol(&s->gb, &p->vlc_state[context], bits);
763 // 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));
766 if(sign) diff= -diff;
768 sample[1][x]= (predict(sample[1] + x, sample[0] + x) + diff) & ((1<<bits)-1);
770 s->run_index= run_index;
773 static void decode_plane(FFV1Context *s, uint8_t *src, int w, int h, int stride, int plane_index){
775 int_fast16_t sample_buffer[2][w+6];
776 int_fast16_t *sample[2]= {sample_buffer[0]+3, sample_buffer[1]+3};
780 memset(sample_buffer, 0, sizeof(sample_buffer));
783 int_fast16_t *temp= sample[0]; //FIXME try a normal buffer
785 sample[0]= sample[1];
788 sample[1][-1]= sample[0][0 ];
789 sample[0][ w]= sample[0][w-1];
792 decode_line(s, w, sample, plane_index, 8);
794 src[x + stride*y]= sample[1][x];
796 //STOP_TIMER("decode-line")}
800 static void decode_rgb_frame(FFV1Context *s, uint32_t *src, int w, int h, int stride){
802 int_fast16_t sample_buffer[3][2][w+6];
803 int_fast16_t *sample[3][2]= {
804 {sample_buffer[0][0]+3, sample_buffer[0][1]+3},
805 {sample_buffer[1][0]+3, sample_buffer[1][1]+3},
806 {sample_buffer[2][0]+3, sample_buffer[2][1]+3}};
810 memset(sample_buffer, 0, sizeof(sample_buffer));
814 int_fast16_t *temp= sample[p][0]; //FIXME try a normal buffer
816 sample[p][0]= sample[p][1];
819 sample[p][1][-1]= sample[p][0][0 ];
820 sample[p][0][ w]= sample[p][0][w-1];
821 decode_line(s, w, sample[p], FFMIN(p, 1), 9);
824 int g= sample[0][1][x];
825 int b= sample[1][1][x];
826 int r= sample[2][1][x];
828 // assert(g>=0 && b>=0 && r>=0);
829 // assert(g<256 && b<512 && r<512);
837 src[x + stride*y]= b + (g<<8) + (r<<16);
842 static int read_quant_table(RangeCoder *c, int16_t *quant_table, int scale){
845 uint8_t state[CONTEXT_SIZE];
847 memset(state, 128, sizeof(state));
849 for(v=0; i<128 ; v++){
850 int len= get_symbol(c, state, 0) + 1;
852 if(len + i > 128) return -1;
855 quant_table[i] = scale*v;
858 //if(i%16==0) printf("\n");
862 for(i=1; i<128; i++){
863 quant_table[256-i]= -quant_table[i];
865 quant_table[128]= -quant_table[127];
870 static int read_header(FFV1Context *f){
871 uint8_t state[CONTEXT_SIZE];
872 int i, context_count;
873 RangeCoder * const c= &f->c;
875 memset(state, 128, sizeof(state));
877 f->version= get_symbol(c, state, 0);
878 f->ac= f->avctx->coder_type= get_symbol(c, state, 0);
879 f->colorspace= get_symbol(c, state, 0); //YUV cs type
880 get_rac(c, state); //no chroma = false
881 f->chroma_h_shift= get_symbol(c, state, 0);
882 f->chroma_v_shift= get_symbol(c, state, 0);
883 get_rac(c, state); //transparency plane
886 if(f->colorspace==0){
887 switch(16*f->chroma_h_shift + f->chroma_v_shift){
888 case 0x00: f->avctx->pix_fmt= PIX_FMT_YUV444P; break;
889 case 0x10: f->avctx->pix_fmt= PIX_FMT_YUV422P; break;
890 case 0x11: f->avctx->pix_fmt= PIX_FMT_YUV420P; break;
891 case 0x20: f->avctx->pix_fmt= PIX_FMT_YUV411P; break;
892 case 0x33: f->avctx->pix_fmt= PIX_FMT_YUV410P; break;
894 av_log(f->avctx, AV_LOG_ERROR, "format not supported\n");
897 }else if(f->colorspace==1){
898 if(f->chroma_h_shift || f->chroma_v_shift){
899 av_log(f->avctx, AV_LOG_ERROR, "chroma subsampling not supported in this colorspace\n");
902 f->avctx->pix_fmt= PIX_FMT_RGBA32;
904 av_log(f->avctx, AV_LOG_ERROR, "colorspace not supported\n");
908 //printf("%d %d %d\n", f->chroma_h_shift, f->chroma_v_shift,f->avctx->pix_fmt);
912 context_count*= read_quant_table(c, f->quant_table[i], context_count);
913 if(context_count < 0 || context_count > 32768){
914 av_log(f->avctx, AV_LOG_ERROR, "read_quant_table error\n");
918 context_count= (context_count+1)/2;
920 for(i=0; i<f->plane_count; i++){
921 PlaneContext * const p= &f->plane[i];
923 p->context_count= context_count;
926 if(!p->state) p->state= av_malloc(CONTEXT_SIZE*p->context_count*sizeof(uint8_t));
928 if(!p->vlc_state) p->vlc_state= av_malloc(p->context_count*sizeof(VlcState));
935 static int decode_init(AVCodecContext *avctx)
937 // FFV1Context *s = avctx->priv_data;
944 static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, uint8_t *buf, int buf_size){
945 FFV1Context *f = avctx->priv_data;
946 RangeCoder * const c= &f->c;
947 const int width= f->width;
948 const int height= f->height;
949 AVFrame * const p= &f->picture;
951 uint8_t keystate= 128;
953 AVFrame *picture = data;
955 ff_init_range_decoder(c, buf, buf_size);
956 ff_build_rac_states(c, 0.05*(1LL<<32), 256-8);
959 p->pict_type= FF_I_TYPE; //FIXME I vs. P
960 if(get_rac(c, &keystate)){
969 if(avctx->get_buffer(avctx, p) < 0){
970 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
974 if(avctx->debug&FF_DEBUG_PICT_INFO)
975 av_log(avctx, AV_LOG_ERROR, "keyframe:%d coder:%d\n", p->key_frame, f->ac);
978 bytes_read = c->bytestream - c->bytestream_start - 1;
979 if(bytes_read ==0) av_log(avctx, AV_LOG_ERROR, "error at end of AC stream\n"); //FIXME
980 //printf("pos=%d\n", bytes_read);
981 init_get_bits(&f->gb, buf + bytes_read, buf_size - bytes_read);
983 bytes_read = 0; /* avoid warning */
986 if(f->colorspace==0){
987 const int chroma_width = -((-width )>>f->chroma_h_shift);
988 const int chroma_height= -((-height)>>f->chroma_v_shift);
989 decode_plane(f, p->data[0], width, height, p->linesize[0], 0);
991 decode_plane(f, p->data[1], chroma_width, chroma_height, p->linesize[1], 1);
992 decode_plane(f, p->data[2], chroma_width, chroma_height, p->linesize[2], 1);
994 decode_rgb_frame(f, (uint32_t*)p->data[0], width, height, p->linesize[0]/4);
1003 avctx->release_buffer(avctx, p); //FIXME
1005 *data_size = sizeof(AVFrame);
1008 bytes_read= c->bytestream - c->bytestream_start - 1;
1009 if(bytes_read ==0) av_log(f->avctx, AV_LOG_ERROR, "error at end of frame\n");
1011 bytes_read+= (get_bits_count(&f->gb)+7)/8;
1017 AVCodec ffv1_decoder = {
1021 sizeof(FFV1Context),
1026 CODEC_CAP_DR1 /*| CODEC_CAP_DRAW_HORIZ_BAND*/,
1030 #ifdef CONFIG_ENCODERS
1031 AVCodec ffv1_encoder = {
1035 sizeof(FFV1Context),