patched ffmpeg nov 2

source/patched-ffmpeg-mt/libavcodec/ffv1.c

 /*
  * FFV1 codec for libavcodec
  *
  * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
  *
  * This file is part of FFmpeg.
  *
  * FFmpeg 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
@@ skipping 14 matching lines @@
  * FF Video Codec 1 (a lossless codec)
  */
 
 #include "avcodec.h"
 #include "get_bits.h"
 #include "put_bits.h"
 #include "dsputil.h"
 #include "rangecoder.h"
 #include "golomb.h"
 #include "mathops.h"
+#include "libavutil/avassert.h"
 
 #define MAX_PLANES 4
 #define CONTEXT_SIZE 32
 
+#define MAX_QUANT_TABLES 8
+#define MAX_CONTEXT_INPUTS 5
+
 extern const uint8_t ff_log2_run[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,
@@ skipping 157 matching lines @@
 };
 
 typedef struct VlcState{
     int16_t drift;
     uint16_t error_sum;
     int8_t bias;
     uint8_t count;
 } VlcState;
 
 typedef struct PlaneContext{
+    int16_t quant_table[MAX_CONTEXT_INPUTS][256];
     int context_count;
     uint8_t (*state)[CONTEXT_SIZE];
     VlcState *vlc_state;
     uint8_t interlace_bit_state[2];
 } PlaneContext;
 
+#define MAX_SLICES 256
+
 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=range coder <-> 0=golomb rice
     PlaneContext plane[MAX_PLANES];
-    int16_t quant_table[5][256];
+    int16_t quant_table[MAX_CONTEXT_INPUTS][256];
+    int16_t quant_tables[MAX_QUANT_TABLES][MAX_CONTEXT_INPUTS][256];
+    int context_count[MAX_QUANT_TABLES];
     uint8_t state_transition[256];
     int run_index;
     int colorspace;
     int_fast16_t *sample_buffer;
 
+    int quant_table_count;
+
     DSPContext dsp;
+
+    struct FFV1Context *slice_context[MAX_SLICES];
+    int slice_count;
+    int num_v_slices;
+    int num_h_slices;
+    int slice_width;
+    int slice_height;
+    int slice_x;
+    int slice_y;
 }FFV1Context;
 
 static av_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){
+static inline int get_context(PlaneContext *p, 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]){
+    if(p->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];
+        return p->quant_table[0][(L-LT) & 0xFF] + p->quant_table[1][(LT-T) & 0xFF] + p->quant_table[2][(T-RT) & 0xFF]
+              +p->quant_table[3][(LL-L) & 0xFF] + p->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];
+        return p->quant_table[0][(L-LT) & 0xFF] + p->quant_table[1][(LT-T) & 0xFF] + p->quant_table[2][(T-RT) & 0xFF];
 }
 
 static inline void put_symbol_inline(RangeCoder *c, uint8_t *state, int v, int is_signed){
     int i;
 
     if(v){
         const int a= FFABS(v);
         const int e= av_log2(a);
         put_rac(c, state+0, 0);
         if(e<=9){
@@ skipping 157 matching lines @@
     }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);
+        context= get_context(p, 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){
@@ skipping 118 matching lines @@
 
     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_quant_tables(RangeCoder *c, int16_t quant_table[MAX_CONTEXT_INPUTS][256]){
+    int i;
+    for(i=0; i<5; i++)
+        write_quant_table(c, quant_table[i]);
+}
+
 static void write_header(FFV1Context *f){
     uint8_t state[CONTEXT_SIZE];
-    int i;
-    RangeCoder * const c= &f->c;
+    int i, j;
+    RangeCoder * const c= &f->slice_context[0]->c;
 
     memset(state, 128, sizeof(state));
 
-    put_symbol(c, state, f->version, 0);
-    put_symbol(c, state, f->ac, 0);
-    if(f->ac>1){
-        for(i=1; i<256; i++){
-            f->state_transition[i]=ver2_state[i];
-            put_symbol(c, state, ver2_state[i] - c->one_state[i], 1);
+    if(f->version < 2){
+        put_symbol(c, state, f->version, 0);
+        put_symbol(c, state, f->ac, 0);
+        if(f->ac>1){
+            for(i=1; i<256; i++){
+                f->state_transition[i]=ver2_state[i];
+                put_symbol(c, state, ver2_state[i] - c->one_state[i], 1);
+            }
+        }
+        put_symbol(c, state, f->colorspace, 0); //YUV cs type
+        if(f->version>0)
+            put_symbol(c, state, f->avctx->bits_per_raw_sample, 0);
+        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
+
+        write_quant_tables(c, f->quant_table);
+    }else{
+        put_symbol(c, state, f->slice_count, 0);
+        for(i=0; i<f->slice_count; i++){
+            FFV1Context *fs= f->slice_context[i];
+            put_symbol(c, state, (fs->slice_x     +1)*f->num_h_slices / f->width   , 0);
+            put_symbol(c, state, (fs->slice_y     +1)*f->num_v_slices / f->height  , 0);
+            put_symbol(c, state, (fs->slice_width +1)*f->num_h_slices / f->width -1, 0);
+            put_symbol(c, state, (fs->slice_height+1)*f->num_v_slices / f->height-1, 0);
+            for(j=0; j<f->plane_count; j++)
+            put_symbol(c, state, f->avctx->context_model, 0);
         }
     }
-    put_symbol(c, state, f->colorspace, 0); //YUV cs type
-    if(f->version>0)
-        put_symbol(c, state, f->avctx->bits_per_raw_sample, 0);
-    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]);
 }
 #endif /* CONFIG_FFV1_ENCODER */
 
 static av_cold int common_init(AVCodecContext *avctx){
     FFV1Context *s = avctx->priv_data;
 
     s->avctx= avctx;
     s->flags= avctx->flags;
 
     dsputil_init(&s->dsp, avctx);
 
     s->width = avctx->width;
     s->height= avctx->height;
 
     assert(s->width && s->height);
+    //defaults
+    s->num_h_slices=1;
+    s->num_v_slices=1;
 
-    s->sample_buffer = av_malloc(6 * (s->width+6) * sizeof(*s->sample_buffer));
-    if (!s->sample_buffer)
-        return AVERROR(ENOMEM);
 
     return 0;
 }
 
+static int init_slice_state(FFV1Context *f){
+    int i, j;
+
+    for(i=0; i<f->slice_count; i++){
+        FFV1Context *fs= f->slice_context[i];
+        for(j=0; j<f->plane_count; j++){
+            PlaneContext * const p= &fs->plane[j];
+
+            if(fs->ac){
+                if(!p->    state) p->    state= av_malloc(CONTEXT_SIZE*p->context_count*sizeof(uint8_t));
+                if(!p->    state)
+                    return AVERROR(ENOMEM);
+            }else{
+                if(!p->vlc_state) p->vlc_state= av_malloc(p->context_count*sizeof(VlcState));
+                if(!p->vlc_state)
+                    return AVERROR(ENOMEM);
+            }
+        }
+
+        if (fs->ac>1){
+            //FIXME only redo if state_transition changed
+            for(j=1; j<256; j++){
+                fs->c.one_state [    j]= fs->state_transition[j];
+                fs->c.zero_state[256-j]= 256-fs->c.one_state [j];
+            }
+        }
+    }
+
+    return 0;
+}
+
+static av_cold int init_slice_contexts(FFV1Context *f){
+    int i;
+
+    f->slice_count= f->num_h_slices * f->num_v_slices;
+
+    for(i=0; i<f->slice_count; i++){
+        FFV1Context *fs= av_mallocz(sizeof(*fs));
+        int sx= i % f->num_h_slices;
+        int sy= i / f->num_h_slices;
+        int sxs= f->avctx->width * sx    / f->num_h_slices;
+        int sxe= f->avctx->width *(sx+1) / f->num_h_slices;
+        int sys= f->avctx->height* sy    / f->num_v_slices;
+        int sye= f->avctx->height*(sy+1) / f->num_v_slices;
+        f->slice_context[i]= fs;
+        memcpy(fs, f, sizeof(*fs));
+
+        fs->slice_width = sxe - sxs;
+        fs->slice_height= sye - sys;
+        fs->slice_x     = sxs;
+        fs->slice_y     = sys;
+
+        fs->sample_buffer = av_malloc(6 * (fs->width+6) * sizeof(*fs->sample_buffer));
+        if (!fs->sample_buffer)
+            return AVERROR(ENOMEM);
+    }
+    return 0;
+}
+
 #if CONFIG_FFV1_ENCODER
+static int write_extra_header(FFV1Context *f){
+    RangeCoder * const c= &f->c;
+    uint8_t state[CONTEXT_SIZE];
+    int i;
+    memset(state, 128, sizeof(state));
+
+    f->avctx->extradata= av_malloc(f->avctx->extradata_size= 10000);
+    ff_init_range_encoder(c, f->avctx->extradata, f->avctx->extradata_size);
+    ff_build_rac_states(c, 0.05*(1LL<<32), 256-8);
+
+    put_symbol(c, state, f->version, 0);
+    put_symbol(c, state, f->ac, 0);
+    if(f->ac>1){
+        for(i=1; i<256; i++){
+            f->state_transition[i]=ver2_state[i];
+            put_symbol(c, state, ver2_state[i] - c->one_state[i], 1);
+        }
+    }
+    put_symbol(c, state, f->colorspace, 0); //YUV cs type
+    put_symbol(c, state, f->avctx->bits_per_raw_sample, 0);
+    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
+    put_symbol(c, state, f->num_h_slices-1, 0);
+    put_symbol(c, state, f->num_v_slices-1, 0);
+
+    put_symbol(c, state, f->quant_table_count, 0);
+    for(i=0; i<f->quant_table_count; i++)
+        write_quant_tables(c, f->quant_tables[i]);
+
+    f->avctx->extradata_size= ff_rac_terminate(c);
+
+    return 0;
+}
+
 static av_cold int encode_init(AVCodecContext *avctx)
 {
     FFV1Context *s = avctx->priv_data;
     int i;
 
     common_init(avctx);
 
     s->version=0;
     s->ac= avctx->coder_type ? 2:0;
 
     s->plane_count=2;
     for(i=0; i<256; i++){
+        s->quant_table_count=2;
         if(avctx->bits_per_raw_sample <=8){
-            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];
-            }
+            s->quant_tables[0][0][i]=           quant11[i];
+            s->quant_tables[0][1][i]=        11*quant11[i];
+            s->quant_tables[0][2][i]=     11*11*quant11[i];
+            s->quant_tables[1][0][i]=           quant11[i];
+            s->quant_tables[1][1][i]=        11*quant11[i];
+            s->quant_tables[1][2][i]=     11*11*quant5 [i];
+            s->quant_tables[1][3][i]=   5*11*11*quant5 [i];
+            s->quant_tables[1][4][i]= 5*5*11*11*quant5 [i];
         }else{
-            s->quant_table[0][i]=           quant9_10bit[i];
-            s->quant_table[1][i]=        11*quant9_10bit[i];
-            if(avctx->context_model==0){
-                s->quant_table[2][i]=     11*11*quant9_10bit[i];
-                s->quant_table[3][i]=
-                s->quant_table[4][i]=0;
-            }else{
-                s->quant_table[2][i]=     11*11*quant5_10bit[i];
-                s->quant_table[3][i]=   5*11*11*quant5_10bit[i];
-                s->quant_table[4][i]= 5*5*11*11*quant5_10bit[i];
-            }
+            s->quant_tables[0][0][i]=           quant9_10bit[i];
+            s->quant_tables[0][1][i]=        11*quant9_10bit[i];
+            s->quant_tables[0][2][i]=     11*11*quant9_10bit[i];
+            s->quant_tables[1][0][i]=           quant9_10bit[i];
+            s->quant_tables[1][1][i]=        11*quant9_10bit[i];
+            s->quant_tables[1][2][i]=     11*11*quant5_10bit[i];
+            s->quant_tables[1][3][i]=   5*11*11*quant5_10bit[i];
+            s->quant_tables[1][4][i]= 5*5*11*11*quant5_10bit[i];
         }
     }
+    memcpy(s->quant_table, s->quant_tables[avctx->context_model], sizeof(s->quant_table));
 
     for(i=0; i<s->plane_count; i++){
         PlaneContext * const p= &s->plane[i];
 
+        memcpy(p->quant_table, s->quant_table, sizeof(p->quant_table));
         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_YUV444P16:
     case PIX_FMT_YUV422P16:
     case PIX_FMT_YUV420P16:
         if(avctx->bits_per_raw_sample <=8){
             av_log(avctx, AV_LOG_ERROR, "bits_per_raw_sample invalid\n");
             return -1;
         }
         if(!s->ac){
             av_log(avctx, AV_LOG_ERROR, "bits_per_raw_sample of more than 8 needs -coder 1 currently\n");
             return -1;
         }
-        s->version= 1;
+        s->version= FFMAX(s->version, 1);
     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_RGB32:
         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;
 
+    if(s->version>1){
+        s->num_h_slices=2;
+        s->num_v_slices=2;
+        write_extra_header(s);
+    }
+
+    if(init_slice_contexts(s) < 0)
+        return -1;
+    if(init_slice_state(s) < 0)
+        return -1;
+
     return 0;
 }
 #endif /* CONFIG_FFV1_ENCODER */
 
 
 static void clear_state(FFV1Context *f){
-    int i, j;
+    int i, si, j;
 
-    for(i=0; i<f->plane_count; i++){
-        PlaneContext *p= &f->plane[i];
+    for(si=0; si<f->slice_count; si++){
+        FFV1Context *fs= f->slice_context[si];
+        for(i=0; i<f->plane_count; i++){
+            PlaneContext *p= &fs->plane[i];
 
-        p->interlace_bit_state[0]= 128;
-        p->interlace_bit_state[1]= 128;
+            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;
+            for(j=0; j<p->context_count; j++){
+                if(fs->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;
+                }
             }
         }
     }
 }
 
 #if CONFIG_FFV1_ENCODER
+static int encode_slice(AVCodecContext *c, void *arg){
+    FFV1Context *fs= *(void**)arg;
+    FFV1Context *f= fs->avctx->priv_data;
+    int width = fs->slice_width;
+    int height= fs->slice_height;
+    int x= fs->slice_x;
+    int y= fs->slice_y;
+    AVFrame * const p= &f->picture;
+
+    if(f->colorspace==0){
+        const int chroma_width = -((-width )>>f->chroma_h_shift);
+        const int chroma_height= -((-height)>>f->chroma_v_shift);
+        const int cx= x>>f->chroma_h_shift;
+        const int cy= y>>f->chroma_v_shift;
+
+        encode_plane(fs, p->data[0] + x + y*p->linesize[0], width, height, p->linesize[0], 0);
+
+        encode_plane(fs, p->data[1] + cx+cy*p->linesize[1], chroma_width, chroma_height, p->linesize[1], 1);
+        encode_plane(fs, p->data[2] + cx+cy*p->linesize[2], chroma_width, chroma_height, p->linesize[2], 1);
+    }else{
+        encode_rgb_frame(fs, (uint32_t*)(p->data[0]) + x + y*(p->linesize[0]/4), width, height, p->linesize[0]/4);
+    }
+    emms_c();
+
+    return 0;
+}
+
 static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){
     FFV1Context *f = avctx->priv_data;
-    RangeCoder * const c= &f->c;
+    RangeCoder * const c= &f->slice_context[0]->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;
+    uint8_t *buf_p;
+    int i;
 
     ff_init_range_encoder(c, buf, buf_size);
     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);
+        init_put_bits(&f->slice_context[0]->pb, buf + used_count, buf_size - used_count);
     }else if (f->ac>1){
         int i;
         for(i=1; i<256; i++){
             c->one_state[i]= f->state_transition[i];
             c->zero_state[256-i]= 256-c->one_state[i];
         }
     }
 
-    if(f->colorspace==0){
-        const int chroma_width = -((-width )>>f->chroma_h_shift);
-        const int chroma_height= -((-height)>>f->chroma_v_shift);
+    for(i=1; i<f->slice_count; i++){
+        FFV1Context *fs= f->slice_context[i];
+        uint8_t *start= buf + (buf_size-used_count)*i/f->slice_count;
+        int len= buf_size/f->slice_count;
 
-        encode_plane(f, p->data[0], width, height, p->linesize[0], 0);
+        if(fs->ac){
+            ff_init_range_encoder(&fs->c, start, len);
+        }else{
+            init_put_bits(&fs->pb, start, len);
+        }
+    }
+    avctx->execute(avctx, encode_slice, &f->slice_context[0], NULL, f->slice_count, sizeof(void*));
 
-        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);
+    buf_p=buf;
+    for(i=0; i<f->slice_count; i++){
+        FFV1Context *fs= f->slice_context[i];
+        int bytes;
+
+        if(fs->ac){
+            uint8_t state=128;
+            put_rac(&fs->c, &state, 0);
+            bytes= ff_rac_terminate(&fs->c);
+        }else{
+            flush_put_bits(&fs->pb); //nicer padding FIXME
+            bytes= used_count + (put_bits_count(&fs->pb)+7)/8;
+            used_count= 0;
+        }
+        if(i>0){
+            av_assert0(bytes < buf_size/f->slice_count);
+            memmove(buf_p, fs->ac ? fs->c.bytestream_start : fs->pb.buf, bytes);
+            av_assert0(bytes < (1<<24));
+            AV_WB24(buf_p+bytes, bytes);
+            bytes+=3;
+        }
+        buf_p += bytes;
     }
-    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;
-    }
+    return buf_p-buf;
 }
 #endif /* CONFIG_FFV1_ENCODER */
 
 static av_cold int common_end(AVCodecContext *avctx){
     FFV1Context *s = avctx->priv_data;
-    int i;
+    int i, j;
 
-    for(i=0; i<s->plane_count; i++){
-        PlaneContext *p= &s->plane[i];
+    for(j=0; j<s->slice_count; j++){
+        FFV1Context *fs= s->slice_context[j];
+        for(i=0; i<s->plane_count; i++){
+            PlaneContext *p= &fs->plane[i];
 
-        av_freep(&p->state);
-        av_freep(&p->vlc_state);
+            av_freep(&p->state);
+            av_freep(&p->vlc_state);
+        }
+        av_freep(&fs->sample_buffer);
     }
 
-    av_freep(&s->sample_buffer);
-
     return 0;
 }
 
 static av_always_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);
+        context= get_context(p, sample[1] + x, sample[0] + x, sample[1] + x);
         if(context < 0){
             context= -context;
             sign=1;
         }else
             sign=0;
 
+        av_assert2(context < p->context_count);
 
         if(s->ac){
             diff= get_symbol_inline(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<<ff_log2_run[run_index];
@@ skipping 96 matching lines @@
             r -= 0x100;
             g -= (b + r)>>2;
             b += g;
             r += g;
 
             src[x + stride*y]= b + (g<<8) + (r<<16) + (0xFF<<24);
         }
     }
 }
 
+static int decode_slice(AVCodecContext *c, void *arg){
+    FFV1Context *fs= *(void**)arg;
+    FFV1Context *f= fs->avctx->priv_data;
+    int width = fs->slice_width;
+    int height= fs->slice_height;
+    int x= fs->slice_x;
+    int y= fs->slice_y;
+    AVFrame * const p= &f->picture;
+
+    av_assert1(width && height);
+    if(f->colorspace==0){
+        const int chroma_width = -((-width )>>f->chroma_h_shift);
+        const int chroma_height= -((-height)>>f->chroma_v_shift);
+        const int cx= x>>f->chroma_h_shift;
+        const int cy= y>>f->chroma_v_shift;
+        decode_plane(fs, p->data[0] + x + y*p->linesize[0], width, height, p->linesize[0], 0);
+
+        decode_plane(fs, p->data[1] + cx+cy*p->linesize[1], chroma_width, chroma_height, p->linesize[1], 1);
+        decode_plane(fs, p->data[2] + cx+cy*p->linesize[1], chroma_width, chroma_height, p->linesize[2], 1);
+    }else{
+        decode_rgb_frame(fs, (uint32_t*)p->data[0] + x + y*(p->linesize[0]/4), width, height, p->linesize[0]/4);
+    }
+
+    emms_c();
+
+    return 0;
+}
+
 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){
+static int read_quant_tables(RangeCoder *c, int16_t quant_table[MAX_CONTEXT_INPUTS][256]){
+    int i;
+    int context_count=1;
+
+    for(i=0; i<5; i++){
+        context_count*= read_quant_table(c, quant_table[i], context_count);
+        if(context_count > 32768U){
+            return -1;
+        }
+    }
+    return (context_count+1)/2;
+}
+
+static int read_extra_header(FFV1Context *f){
+    RangeCoder * const c= &f->c;
     uint8_t state[CONTEXT_SIZE];
-    int i, context_count;
-    RangeCoder * const c= &f->c;
+    int i;
 
     memset(state, 128, sizeof(state));
 
+    ff_init_range_decoder(c, f->avctx->extradata, f->avctx->extradata_size);
+    ff_build_rac_states(c, 0.05*(1LL<<32), 256-8);
+
     f->version= get_symbol(c, state, 0);
     f->ac= f->avctx->coder_type= get_symbol(c, state, 0);
     if(f->ac>1){
         for(i=1; i<256; i++){
             f->state_transition[i]= get_symbol(c, state, 1) + c->one_state[i];
         }
     }
     f->colorspace= get_symbol(c, state, 0); //YUV cs type
-    if(f->version>0)
-        f->avctx->bits_per_raw_sample= get_symbol(c, state, 0);
+    f->avctx->bits_per_raw_sample= get_symbol(c, state, 0);
     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;
+    f->num_h_slices= 1 + get_symbol(c, state, 0);
+    f->num_v_slices= 1 + get_symbol(c, state, 0);
+    if(f->num_h_slices > (unsigned)f->width || f->num_v_slices > (unsigned)f->height){
+        av_log(f->avctx, AV_LOG_ERROR, "too many slices\n");
+        return -1;
+    }
+
+    f->quant_table_count= get_symbol(c, state, 0);
+    if(f->quant_table_count > (unsigned)MAX_QUANT_TABLES)
+        return -1;
+    for(i=0; i<f->quant_table_count; i++){
+        if((f->context_count[i]= read_quant_tables(c, f->quant_tables[i])) < 0){
+            av_log(f->avctx, AV_LOG_ERROR, "read_quant_table error\n");
+            return -1;
+        }
+    }
+
+    return 0;
+}
+
+static int read_header(FFV1Context *f){
+    uint8_t state[CONTEXT_SIZE];
+    int i, j, context_count;
+    RangeCoder * const c= &f->slice_context[0]->c;
+
+    memset(state, 128, sizeof(state));
+
+    if(f->version < 2){
+        f->version= get_symbol(c, state, 0);
+        f->ac= f->avctx->coder_type= get_symbol(c, state, 0);
+        if(f->ac>1){
+            for(i=1; i<256; i++){
+                f->state_transition[i]= get_symbol(c, state, 1) + c->one_state[i];
+            }
+        }
+        f->colorspace= get_symbol(c, state, 0); //YUV cs type
+        if(f->version>0)
+            f->avctx->bits_per_raw_sample= get_symbol(c, state, 0);
+        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){
         if(f->avctx->bits_per_raw_sample<=8){
             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:
@@ skipping 15 matching lines @@
             av_log(f->avctx, AV_LOG_ERROR, "chroma subsampling not supported in this colorspace\n");
             return -1;
         }
         f->avctx->pix_fmt= PIX_FMT_RGB32;
     }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);
+    if(f->version < 2){
+        context_count= read_quant_tables(c, f->quant_table);
+        if(context_count < 0){
+                av_log(f->avctx, AV_LOG_ERROR, "read_quant_table error\n");
+                return -1;
+        }
+    }else{
+        f->slice_count= get_symbol(c, state, 0);
+        if(f->slice_count > (unsigned)MAX_SLICES)
+            return -1;
+    }
 
-    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;
+    for(j=0; j<f->slice_count; j++){
+        FFV1Context *fs= f->slice_context[j];
+        fs->ac= f->ac;
+
+        if(f->version >= 2){
+            fs->slice_x     = get_symbol(c, state, 0)   *f->width ;
+            fs->slice_y     = get_symbol(c, state, 0)   *f->height;
+            fs->slice_width =(get_symbol(c, state, 0)+1)*f->width  + fs->slice_x;
+            fs->slice_height=(get_symbol(c, state, 0)+1)*f->height + fs->slice_y;
+
+            fs->slice_x /= f->num_h_slices;
+            fs->slice_y /= f->num_v_slices;
+            fs->slice_width  = fs->slice_width /f->num_h_slices - fs->slice_x;
+            fs->slice_height = fs->slice_height/f->num_v_slices - fs->slice_y;
+            if((unsigned)fs->slice_width > f->width || (unsigned)fs->slice_height > f->height)
+                return -1;
+            if(    (unsigned)fs->slice_x + (uint64_t)fs->slice_width  > f->width
+                || (unsigned)fs->slice_y + (uint64_t)fs->slice_height > f->height)
+                return -1;
         }
-    }
-    context_count= (context_count+1)/2;
 
-    for(i=0; i<f->plane_count; i++){
-        PlaneContext * const p= &f->plane[i];
+        for(i=0; i<f->plane_count; i++){
+            PlaneContext * const p= &fs->plane[i];
 
-        p->context_count= context_count;
+            if(f->version >= 2){
+                int idx=get_symbol(c, state, 0);
+                if(idx > (unsigned)f->quant_table_count){
+                    av_log(f->avctx, AV_LOG_ERROR, "quant_table_index out of range\n");
+                    return -1;
+                }
+                memcpy(p->quant_table, f->quant_tables[idx], sizeof(p->quant_table));
+                context_count= f->context_count[idx];
+            }else{
+                memcpy(p->quant_table, f->quant_table, sizeof(p->quant_table));
+            }
 
-        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));
+            if(p->context_count < context_count){
+                av_freep(&p->state);
+                av_freep(&p->vlc_state);
+            }
+            p->context_count= context_count;
         }
     }
 
     return 0;
 }
 
 static av_cold int decode_init(AVCodecContext *avctx)
 {
-//    FFV1Context *s = avctx->priv_data;
+    FFV1Context *f = avctx->priv_data;
 
     common_init(avctx);
 
+    if(avctx->extradata && read_extra_header(f) < 0)
+        return -1;
+
+    if(init_slice_contexts(f) < 0)
+        return -1;
+
     return 0;
 }
 
 static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt){
     const uint8_t *buf = avpkt->data;
     int buf_size = avpkt->size;
     FFV1Context *f = avctx->priv_data;
-    RangeCoder * const c= &f->c;
-    const int width= f->width;
-    const int height= f->height;
+    RangeCoder * const c= &f->slice_context[0]->c;
     AVFrame * const p= &f->picture;
-    int bytes_read;
+    int bytes_read, i;
     uint8_t keystate= 128;
+    const uint8_t *buf_p;
 
     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;
+        if(init_slice_state(f) < 0)
+            return -1;
+
         clear_state(f);
     }else{
         p->key_frame= 0;
     }
     if(f->ac>1){
         int i;
         for(i=1; i<256; i++){
             c->one_state[i]= f->state_transition[i];
             c->zero_state[256-i]= 256-c->one_state[i];
         }
     }
 
-    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);
+        init_get_bits(&f->slice_context[0]->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);
+    buf_p= buf + buf_size;
+    for(i=f->slice_count-1; i>0; i--){
+        FFV1Context *fs= f->slice_context[i];
+        int v= AV_RB24(buf_p-3)+3;
+        if(buf_p - buf <= v){
+            av_log(avctx, AV_LOG_ERROR, "Slice pointer chain broken\n");
+            return -1;
+        }
+        buf_p -= v;
+        if(fs->ac){
+            ff_init_range_decoder(&fs->c, buf_p, v);
+        }else{
+            init_get_bits(&fs->gb, buf_p, v);
+        }
     }
 
-    emms_c();
-
+    avctx->execute(avctx, decode_slice, &f->slice_context[0], NULL, f->slice_count, sizeof(void*));
     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;
+    return buf_size;
 }
 
 AVCodec ffv1_decoder = {
     "ffv1",
     AVMEDIA_TYPE_VIDEO,
     CODEC_ID_FFV1,
     sizeof(FFV1Context),
     decode_init,
     NULL,
     common_end,
     decode_frame,
     CODEC_CAP_DR1 /*| CODEC_CAP_DRAW_HORIZ_BAND*/,
     NULL,
     .long_name= NULL_IF_CONFIG_SMALL("FFmpeg video codec #1"),
 };
 
 #if CONFIG_FFV1_ENCODER
 AVCodec ffv1_encoder = {
     "ffv1",
     AVMEDIA_TYPE_VIDEO,
     CODEC_ID_FFV1,
     sizeof(FFV1Context),
     encode_init,
     encode_frame,
     common_end,
     .pix_fmts= (const enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_YUV444P, PIX_FMT_YUV422P, PIX_FMT_YUV411P, PIX_FMT_YUV410P, PIX_FMT_RGB32, PIX_FMT_YUV420P16, PIX_FMT_YUV422P16, PIX_FMT_YUV444P16, PIX_FMT_NONE},
     .long_name= NULL_IF_CONFIG_SMALL("FFmpeg video codec #1"),
 };
 #endif