/*
  * FFV1 decoder
  *

  * Copyright (c) 2003-2013 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
  * version 2.1 of the License, or (at your option) any later version.
  *
  * FFmpeg 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 FFmpeg; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /**
  * @file
  * FF Video Codec 1 (a lossless codec) decoder
  */
 
 #include "libavutil/avassert.h"
 #include "libavutil/crc.h"
 #include "libavutil/opt.h"
 #include "libavutil/imgutils.h"
 #include "libavutil/pixdesc.h"
 #include "libavutil/timer.h"
 #include "avcodec.h"
 #include "internal.h"
 #include "get_bits.h"
 #include "rangecoder.h"
 #include "golomb.h"
 #include "mathops.h"
 #include "ffv1.h"
 
 static inline av_flatten int get_symbol_inline(RangeCoder *c, uint8_t *state,
                                                int is_signed)
 {
     if (get_rac(c, state + 0))
         return 0;
     else {

         int i, e;
         unsigned a;

         e = 0;

         while (get_rac(c, state + 1 + FFMIN(e, 9))) { // 1..10

             e++;

             if (e > 31)
                 return AVERROR_INVALIDDATA;
         }

 
         a = 1;
         for (i = e - 1; i >= 0; i--)
             a += a + get_rac(c, state + 22 + FFMIN(i, 9));  // 22..31
 
         e = -(is_signed && get_rac(c, state + 11 + FFMIN(e, 10))); // 11..21
         return (a ^ e) - e;
     }
 }
 
 static av_noinline int get_symbol(RangeCoder *c, uint8_t *state, int is_signed)
 {
     return get_symbol_inline(c, state, is_signed);
 }
 
 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;
     }
 
     v = get_sr_golomb(gb, k, 12, bits);

     ff_dlog(NULL, "v:%d bias:%d error:%d drift:%d count:%d k:%d",

             v, state->bias, state->error_sum, state->drift, state->count, k);
 
     v ^= ((2 * state->drift + state->count) >> 31);
 
     ret = fold(v + state->bias, bits);
 
     update_vlc_state(state, v);
 
     return ret;
 }
 

 static int is_input_end(FFV1Context *s)
 {
     if (s->ac != AC_GOLOMB_RICE) {
         RangeCoder *const c = &s->c;
         if (c->overread > MAX_OVERREAD)
             return AVERROR_INVALIDDATA;
     } else {
         if (get_bits_left(&s->gb) < 1)
             return AVERROR_INVALIDDATA;
     }
     return 0;
 }
 

 #define TYPE int16_t
 #define RENAME(name) name
 #include "ffv1dec_template.c"
 #undef TYPE
 #undef RENAME

 #define TYPE int32_t
 #define RENAME(name) name ## 32
 #include "ffv1dec_template.c"

 static int decode_plane(FFV1Context *s, uint8_t *src,

                          int w, int h, int stride, int plane_index,
                          int pixel_stride)

 {
     int x, y;
     int16_t *sample[2];
     sample[0] = s->sample_buffer + 3;
     sample[1] = s->sample_buffer + w + 6 + 3;
 
     s->run_index = 0;
 
     memset(s->sample_buffer, 0, 2 * (w + 6) * sizeof(*s->sample_buffer));
 
     for (y = 0; y < h; y++) {
         int16_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
         if (s->avctx->bits_per_raw_sample <= 8) {

             int ret = decode_line(s, w, sample, plane_index, 8);
             if (ret < 0)
                 return ret;

             for (x = 0; x < w; x++)

                 src[x*pixel_stride + stride * y] = sample[1][x];

         } else {

             int ret = decode_line(s, w, sample, plane_index, s->avctx->bits_per_raw_sample);
             if (ret < 0)
                 return ret;

             if (s->packed_at_lsb) {
                 for (x = 0; x < w; x++) {

                     ((uint16_t*)(src + stride*y))[x*pixel_stride] = sample[1][x];

                 }
             } else {
                 for (x = 0; x < w; x++) {

                     ((uint16_t*)(src + stride*y))[x*pixel_stride] = sample[1][x] << (16 - s->avctx->bits_per_raw_sample) | ((uint16_t **)sample)[1][x] >> (2 * s->avctx->bits_per_raw_sample - 16);

                 }
             }
         }
 // STOP_TIMER("decode-line") }
     }

     return 0;

 }
 
 static int decode_slice_header(FFV1Context *f, FFV1Context *fs)
 {
     RangeCoder *c = &fs->c;
     uint8_t state[CONTEXT_SIZE];
     unsigned ps, i, context_count;
     memset(state, 128, sizeof(state));
 
     av_assert0(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;
 
     for (i = 0; i < f->plane_count; i++) {
         PlaneContext * const p = &fs->plane[i];
         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;
         }
         p->quant_table_index = idx;
         memcpy(p->quant_table, f->quant_tables[idx], sizeof(p->quant_table));
         context_count = f->context_count[idx];
 
         if (p->context_count < context_count) {
             av_freep(&p->state);
             av_freep(&p->vlc_state);
         }
         p->context_count = context_count;
     }
 
     ps = get_symbol(c, state, 0);
     if (ps == 1) {

         f->cur->interlaced_frame = 1;
         f->cur->top_field_first  = 1;

     } else if (ps == 2) {

         f->cur->interlaced_frame = 1;
         f->cur->top_field_first  = 0;

     } else if (ps == 3) {

         f->cur->interlaced_frame = 0;

     }

     f->cur->sample_aspect_ratio.num = get_symbol(c, state, 0);
     f->cur->sample_aspect_ratio.den = get_symbol(c, state, 0);

     if (av_image_check_sar(f->width, f->height,
                            f->cur->sample_aspect_ratio) < 0) {
         av_log(f->avctx, AV_LOG_WARNING, "ignoring invalid SAR: %u/%u\n",
                f->cur->sample_aspect_ratio.num,
                f->cur->sample_aspect_ratio.den);
         f->cur->sample_aspect_ratio = (AVRational){ 0, 1 };
     }
 

     if (fs->version > 3) {
         fs->slice_reset_contexts = get_rac(c, state);
         fs->slice_coding_mode = get_symbol(c, state, 0);

         if (fs->slice_coding_mode != 1) {

             fs->slice_rct_by_coef = get_symbol(c, state, 0);
             fs->slice_rct_ry_coef = get_symbol(c, state, 0);
             if ((uint64_t)fs->slice_rct_by_coef + (uint64_t)fs->slice_rct_ry_coef > 4) {

                 av_log(f->avctx, AV_LOG_ERROR, "slice_rct_y_coef out of range\n");
                 return AVERROR_INVALIDDATA;
             }
         }

     }

     return 0;
 }
 
 static int decode_slice(AVCodecContext *c, void *arg)
 {

     FFV1Context *fs   = *(void **)arg;
     FFV1Context *f    = fs->avctx->priv_data;

     int width, height, x, y, ret;

     const int ps      = av_pix_fmt_desc_get(c->pix_fmt)->comp[0].step;

     AVFrame * const p = f->cur;

     int i, si;
 
     for( si=0; fs != f->slice_context[si]; si ++)
         ;
 
     if(f->fsrc && !p->key_frame)
         ff_thread_await_progress(&f->last_picture, si, 0);
 
     if(f->fsrc && !p->key_frame) {
         FFV1Context *fssrc = f->fsrc->slice_context[si];
         FFV1Context *fsdst = f->slice_context[si];
         av_assert1(fsdst->plane_count == fssrc->plane_count);
         av_assert1(fsdst == fs);
 
         if (!p->key_frame)
             fsdst->slice_damaged |= fssrc->slice_damaged;
 
         for (i = 0; i < f->plane_count; i++) {
             PlaneContext *psrc = &fssrc->plane[i];
             PlaneContext *pdst = &fsdst->plane[i];
 
             av_free(pdst->state);
             av_free(pdst->vlc_state);
             memcpy(pdst, psrc, sizeof(*pdst));
             pdst->state = NULL;
             pdst->vlc_state = NULL;
 
             if (fssrc->ac) {

                 pdst->state = av_malloc_array(CONTEXT_SIZE,  psrc->context_count);

                 memcpy(pdst->state, psrc->state, CONTEXT_SIZE * psrc->context_count);
             } else {

                 pdst->vlc_state = av_malloc_array(sizeof(*pdst->vlc_state), psrc->context_count);

                 memcpy(pdst->vlc_state, psrc->vlc_state, sizeof(*pdst->vlc_state) * psrc->context_count);
             }
         }
     }

     fs->slice_rct_by_coef = 1;
     fs->slice_rct_ry_coef = 1;

     if (f->version > 2) {

         if (ff_ffv1_init_slice_state(f, fs) < 0)

             return AVERROR(ENOMEM);
         if (decode_slice_header(f, fs) < 0) {

             fs->slice_x = fs->slice_y = fs->slice_height = fs->slice_width = 0;

             fs->slice_damaged = 1;
             return AVERROR_INVALIDDATA;
         }
     }

     if ((ret = ff_ffv1_init_slice_state(f, fs)) < 0)

         return ret;

     if (f->cur->key_frame || fs->slice_reset_contexts)

         ff_ffv1_clear_slice_state(f, fs);

     width  = fs->slice_width;
     height = fs->slice_height;
     x      = fs->slice_x;
     y      = fs->slice_y;

     if (fs->ac == AC_GOLOMB_RICE) {

         if (f->version == 3 && f->micro_version > 1 || f->version > 3)

             get_rac(&fs->c, (uint8_t[]) { 129 });
         fs->ac_byte_count = f->version > 2 || (!x && !y) ? fs->c.bytestream - fs->c.bytestream_start - 1 : 0;

         init_get_bits(&fs->gb,
                       fs->c.bytestream_start + fs->ac_byte_count,
                       (fs->c.bytestream_end - fs->c.bytestream_start - fs->ac_byte_count) * 8);
     }
 
     av_assert1(width && height);

     if (f->colorspace == 0 && (f->chroma_planes || !fs->transparency)) {

         const int chroma_width  = AV_CEIL_RSHIFT(width,  f->chroma_h_shift);
         const int chroma_height = AV_CEIL_RSHIFT(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] + ps*x + y*p->linesize[0], width, height, p->linesize[0], 0, 1);

 
         if (f->chroma_planes) {

             decode_plane(fs, p->data[1] + ps*cx+cy*p->linesize[1], chroma_width, chroma_height, p->linesize[1], 1, 1);
             decode_plane(fs, p->data[2] + ps*cx+cy*p->linesize[2], chroma_width, chroma_height, p->linesize[2], 1, 1);

         }
         if (fs->transparency)

             decode_plane(fs, p->data[3] + ps*x + y*p->linesize[3], width, height, p->linesize[3], (f->version >= 4 && !f->chroma_planes) ? 1 : 2, 1);
     } else if (f->colorspace == 0) {
          decode_plane(fs, p->data[0] + ps*x + y*p->linesize[0]    , width, height, p->linesize[0], 0, 2);
          decode_plane(fs, p->data[0] + ps*x + y*p->linesize[0] + 1, width, height, p->linesize[0], 1, 2);

     } else if (f->use32bit) {

         uint8_t *planes[4] = { p->data[0] + ps * x + y * p->linesize[0],

                                p->data[1] + ps * x + y * p->linesize[1],

                                p->data[2] + ps * x + y * p->linesize[2],
                                p->data[3] + ps * x + y * p->linesize[3] };

         decode_rgb_frame32(fs, planes, width, height, p->linesize);

     } else {

         uint8_t *planes[4] = { p->data[0] + ps * x + y * p->linesize[0],

                                p->data[1] + ps * x + y * p->linesize[1],

                                p->data[2] + ps * x + y * p->linesize[2],
                                p->data[3] + ps * x + y * p->linesize[3] };

         decode_rgb_frame(fs, planes, width, height, p->linesize);
     }

     if (fs->ac != AC_GOLOMB_RICE && f->version > 2) {

         int v;

         get_rac(&fs->c, (uint8_t[]) { 129 });

         v = fs->c.bytestream_end - fs->c.bytestream - 2 - 5*f->ec;
         if (v) {
             av_log(f->avctx, AV_LOG_ERROR, "bytestream end mismatching by %d\n", v);
             fs->slice_damaged = 1;
         }
     }
 
     emms_c();
 

     ff_thread_report_progress(&f->picture, si, 0);
 

     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++) {

         unsigned len = get_symbol(c, state, 0) + 1U;

         if (len > 128 - i || !len)

             return AVERROR_INVALIDDATA;

 
         while (len--) {
             quant_table[i] = scale * v;
             i++;
         }
     }
 
     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_quant_tables(RangeCoder *c,
                              int16_t quant_table[MAX_CONTEXT_INPUTS][256])
 {
     int i;
     int context_count = 1;
 
     for (i = 0; i < 5; i++) {

         int ret = read_quant_table(c, quant_table[i], context_count);
         if (ret < 0)
             return ret;
         context_count *= ret;

         if (context_count > 32768U) {

             return AVERROR_INVALIDDATA;

         }
     }
     return (context_count + 1) / 2;
 }
 
 static int read_extra_header(FFV1Context *f)
 {
     RangeCoder *const c = &f->c;
     uint8_t state[CONTEXT_SIZE];

     int i, j, k, ret;

     uint8_t state2[32][CONTEXT_SIZE];

     unsigned crc = 0;

 
     memset(state2, 128, sizeof(state2));
     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);

     if (f->version < 2) {
         av_log(f->avctx, AV_LOG_ERROR, "Invalid version in global header\n");
         return AVERROR_INVALIDDATA;
     }

     if (f->version > 2) {
         c->bytestream_end -= 4;

         f->micro_version = get_symbol(c, state, 0);

         if (f->micro_version < 0)
             return AVERROR_INVALIDDATA;

     }

     f->ac = get_symbol(c, state, 0);

     if (f->ac == AC_RANGE_CUSTOM_TAB) {

         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

     f->avctx->bits_per_raw_sample = get_symbol(c, state, 0);

     f->chroma_planes              = get_rac(c, state);
     f->chroma_h_shift             = get_symbol(c, state, 0);
     f->chroma_v_shift             = get_symbol(c, state, 0);
     f->transparency               = get_rac(c, state);

     f->plane_count                = 1 + (f->chroma_planes || f->version<4) + f->transparency;

     f->num_h_slices               = 1 + get_symbol(c, state, 0);
     f->num_v_slices               = 1 + get_symbol(c, state, 0);

     if (f->chroma_h_shift > 4U || f->chroma_v_shift > 4U) {
         av_log(f->avctx, AV_LOG_ERROR, "chroma shift parameters %d %d are invalid\n",
                f->chroma_h_shift, f->chroma_v_shift);
         return AVERROR_INVALIDDATA;
     }
 

     if (f->num_h_slices > (unsigned)f->width  || !f->num_h_slices ||
         f->num_v_slices > (unsigned)f->height || !f->num_v_slices
        ) {
         av_log(f->avctx, AV_LOG_ERROR, "slice count invalid\n");

         return AVERROR_INVALIDDATA;

     }
 
     f->quant_table_count = get_symbol(c, state, 0);

     if (f->quant_table_count > (unsigned)MAX_QUANT_TABLES || !f->quant_table_count) {
         av_log(f->avctx, AV_LOG_ERROR, "quant table count %d is invalid\n", f->quant_table_count);

         f->quant_table_count = 0;

         return AVERROR_INVALIDDATA;

     }

 
     for (i = 0; i < f->quant_table_count; i++) {
         f->context_count[i] = read_quant_tables(c, f->quant_tables[i]);
         if (f->context_count[i] < 0) {
             av_log(f->avctx, AV_LOG_ERROR, "read_quant_table error\n");

             return AVERROR_INVALIDDATA;

         }
     }

     if ((ret = ff_ffv1_allocate_initial_states(f)) < 0)

         return ret;

 
     for (i = 0; i < f->quant_table_count; i++)

         if (get_rac(c, state)) {

             for (j = 0; j < f->context_count[i]; j++)
                 for (k = 0; k < CONTEXT_SIZE; k++) {
                     int pred = j ? f->initial_states[i][j - 1][k] : 128;
                     f->initial_states[i][j][k] =
                         (pred + get_symbol(c, state2[k], 1)) & 0xFF;
                 }

         }

 
     if (f->version > 2) {
         f->ec = get_symbol(c, state, 0);

         if (f->micro_version > 2)

             f->intra = get_symbol(c, state, 0);

     }
 
     if (f->version > 2) {
         unsigned v;

         v = av_crc(av_crc_get_table(AV_CRC_32_IEEE), 0,
                    f->avctx->extradata, f->avctx->extradata_size);

         if (v || f->avctx->extradata_size < 4) {

             av_log(f->avctx, AV_LOG_ERROR, "CRC mismatch %X!\n", v);
             return AVERROR_INVALIDDATA;
         }

         crc = AV_RB32(f->avctx->extradata + f->avctx->extradata_size - 4);

     }
 

     if (f->avctx->debug & FF_DEBUG_PICT_INFO)
         av_log(f->avctx, AV_LOG_DEBUG,

                "global: ver:%d.%d, coder:%d, colorspace: %d bpr:%d chroma:%d(%d:%d), alpha:%d slices:%dx%d qtabs:%d ec:%d intra:%d CRC:0x%08X\n",

                f->version, f->micro_version,

                f->ac,
                f->colorspace,
                f->avctx->bits_per_raw_sample,
                f->chroma_planes, f->chroma_h_shift, f->chroma_v_shift,
                f->transparency,
                f->num_h_slices, f->num_v_slices,
                f->quant_table_count,
                f->ec,

                f->intra,
                crc

               );

     return 0;
 }
 
 static int read_header(FFV1Context *f)
 {
     uint8_t state[CONTEXT_SIZE];
     int i, j, context_count = -1; //-1 to avoid warning
     RangeCoder *const c = &f->slice_context[0]->c;
 
     memset(state, 128, sizeof(state));
 
     if (f->version < 2) {

         int chroma_planes, chroma_h_shift, chroma_v_shift, transparency, colorspace, bits_per_raw_sample;

         unsigned v= get_symbol(c, state, 0);
         if (v >= 2) {
             av_log(f->avctx, AV_LOG_ERROR, "invalid version %d in ver01 header\n", v);
             return AVERROR_INVALIDDATA;
         }
         f->version = v;

         f->ac = get_symbol(c, state, 0);

         if (f->ac == AC_RANGE_CUSTOM_TAB) {

             for (i = 1; i < 256; i++)
                 f->state_transition[i] = get_symbol(c, state, 1) + c->one_state[i];

         }
 

         colorspace          = get_symbol(c, state, 0); //YUV cs type

         bits_per_raw_sample = f->version > 0 ? get_symbol(c, state, 0) : f->avctx->bits_per_raw_sample;

         chroma_planes       = get_rac(c, state);
         chroma_h_shift      = get_symbol(c, state, 0);
         chroma_v_shift      = get_symbol(c, state, 0);
         transparency        = get_rac(c, state);

         if (colorspace == 0 && f->avctx->skip_alpha)
             transparency = 0;

 
         if (f->plane_count) {

             if (colorspace          != f->colorspace                 ||
                 bits_per_raw_sample != f->avctx->bits_per_raw_sample ||
                 chroma_planes       != f->chroma_planes              ||
                 chroma_h_shift      != f->chroma_h_shift             ||
                 chroma_v_shift      != f->chroma_v_shift             ||
                 transparency        != f->transparency) {

                 av_log(f->avctx, AV_LOG_ERROR, "Invalid change of global parameters\n");
                 return AVERROR_INVALIDDATA;
             }
         }
 

         if (chroma_h_shift > 4U || chroma_v_shift > 4U) {
             av_log(f->avctx, AV_LOG_ERROR, "chroma shift parameters %d %d are invalid\n",
                    chroma_h_shift, chroma_v_shift);
             return AVERROR_INVALIDDATA;
         }
 

         f->colorspace                 = colorspace;

         f->avctx->bits_per_raw_sample = bits_per_raw_sample;

         f->chroma_planes              = chroma_planes;
         f->chroma_h_shift             = chroma_h_shift;
         f->chroma_v_shift             = chroma_v_shift;
         f->transparency               = transparency;

         f->plane_count    = 2 + f->transparency;
     }
 
     if (f->colorspace == 0) {
         if (!f->transparency && !f->chroma_planes) {
             if (f->avctx->bits_per_raw_sample <= 8)
                 f->avctx->pix_fmt = AV_PIX_FMT_GRAY8;

             else if (f->avctx->bits_per_raw_sample == 9) {
                 f->packed_at_lsb = 1;
                 f->avctx->pix_fmt = AV_PIX_FMT_GRAY9;
             } else if (f->avctx->bits_per_raw_sample == 10) {

                 f->packed_at_lsb = 1;
                 f->avctx->pix_fmt = AV_PIX_FMT_GRAY10;
             } else if (f->avctx->bits_per_raw_sample == 12) {
                 f->packed_at_lsb = 1;
                 f->avctx->pix_fmt = AV_PIX_FMT_GRAY12;
             } else if (f->avctx->bits_per_raw_sample == 16) {
                 f->packed_at_lsb = 1;
                 f->avctx->pix_fmt = AV_PIX_FMT_GRAY16;
             } else if (f->avctx->bits_per_raw_sample < 16) {

                 f->avctx->pix_fmt = AV_PIX_FMT_GRAY16;

             } else
                 return AVERROR(ENOSYS);

         } else if (f->transparency && !f->chroma_planes) {
             if (f->avctx->bits_per_raw_sample <= 8)
                 f->avctx->pix_fmt = AV_PIX_FMT_YA8;
             else
                 return AVERROR(ENOSYS);

         } else if (f->avctx->bits_per_raw_sample<=8 && !f->transparency) {
             switch(16 * f->chroma_h_shift + f->chroma_v_shift) {
             case 0x00: f->avctx->pix_fmt = AV_PIX_FMT_YUV444P; break;
             case 0x01: f->avctx->pix_fmt = AV_PIX_FMT_YUV440P; break;
             case 0x10: f->avctx->pix_fmt = AV_PIX_FMT_YUV422P; break;
             case 0x11: f->avctx->pix_fmt = AV_PIX_FMT_YUV420P; break;
             case 0x20: f->avctx->pix_fmt = AV_PIX_FMT_YUV411P; break;
             case 0x22: f->avctx->pix_fmt = AV_PIX_FMT_YUV410P; break;
             }
         } else if (f->avctx->bits_per_raw_sample <= 8 && f->transparency) {
             switch(16*f->chroma_h_shift + f->chroma_v_shift) {
             case 0x00: f->avctx->pix_fmt = AV_PIX_FMT_YUVA444P; break;
             case 0x10: f->avctx->pix_fmt = AV_PIX_FMT_YUVA422P; break;
             case 0x11: f->avctx->pix_fmt = AV_PIX_FMT_YUVA420P; break;
             }

         } else if (f->avctx->bits_per_raw_sample == 9 && !f->transparency) {

             f->packed_at_lsb = 1;
             switch(16 * f->chroma_h_shift + f->chroma_v_shift) {
             case 0x00: f->avctx->pix_fmt = AV_PIX_FMT_YUV444P9; break;
             case 0x10: f->avctx->pix_fmt = AV_PIX_FMT_YUV422P9; break;
             case 0x11: f->avctx->pix_fmt = AV_PIX_FMT_YUV420P9; break;
             }

         } else if (f->avctx->bits_per_raw_sample == 9 && f->transparency) {
             f->packed_at_lsb = 1;
             switch(16 * f->chroma_h_shift + f->chroma_v_shift) {
             case 0x00: f->avctx->pix_fmt = AV_PIX_FMT_YUVA444P9; break;
             case 0x10: f->avctx->pix_fmt = AV_PIX_FMT_YUVA422P9; break;
             case 0x11: f->avctx->pix_fmt = AV_PIX_FMT_YUVA420P9; break;
             }

         } else if (f->avctx->bits_per_raw_sample == 10 && !f->transparency) {

             f->packed_at_lsb = 1;
             switch(16 * f->chroma_h_shift + f->chroma_v_shift) {
             case 0x00: f->avctx->pix_fmt = AV_PIX_FMT_YUV444P10; break;

             case 0x01: f->avctx->pix_fmt = AV_PIX_FMT_YUV440P10; break;

             case 0x10: f->avctx->pix_fmt = AV_PIX_FMT_YUV422P10; break;
             case 0x11: f->avctx->pix_fmt = AV_PIX_FMT_YUV420P10; break;
             }

         } else if (f->avctx->bits_per_raw_sample == 10 && f->transparency) {
             f->packed_at_lsb = 1;
             switch(16 * f->chroma_h_shift + f->chroma_v_shift) {
             case 0x00: f->avctx->pix_fmt = AV_PIX_FMT_YUVA444P10; break;
             case 0x10: f->avctx->pix_fmt = AV_PIX_FMT_YUVA422P10; break;
             case 0x11: f->avctx->pix_fmt = AV_PIX_FMT_YUVA420P10; break;
             }

         } else if (f->avctx->bits_per_raw_sample == 12 && !f->transparency) {
             f->packed_at_lsb = 1;
             switch(16 * f->chroma_h_shift + f->chroma_v_shift) {
             case 0x00: f->avctx->pix_fmt = AV_PIX_FMT_YUV444P12; break;

             case 0x01: f->avctx->pix_fmt = AV_PIX_FMT_YUV440P12; break;

             case 0x10: f->avctx->pix_fmt = AV_PIX_FMT_YUV422P12; break;
             case 0x11: f->avctx->pix_fmt = AV_PIX_FMT_YUV420P12; break;
             }

         } else if (f->avctx->bits_per_raw_sample == 14 && !f->transparency) {
             f->packed_at_lsb = 1;
             switch(16 * f->chroma_h_shift + f->chroma_v_shift) {
             case 0x00: f->avctx->pix_fmt = AV_PIX_FMT_YUV444P14; break;
             case 0x10: f->avctx->pix_fmt = AV_PIX_FMT_YUV422P14; break;
             case 0x11: f->avctx->pix_fmt = AV_PIX_FMT_YUV420P14; break;
             }

         } else if (f->avctx->bits_per_raw_sample == 16 && !f->transparency){

             f->packed_at_lsb = 1;

             switch(16 * f->chroma_h_shift + f->chroma_v_shift) {
             case 0x00: f->avctx->pix_fmt = AV_PIX_FMT_YUV444P16; break;
             case 0x10: f->avctx->pix_fmt = AV_PIX_FMT_YUV422P16; break;
             case 0x11: f->avctx->pix_fmt = AV_PIX_FMT_YUV420P16; break;
             }

         } else if (f->avctx->bits_per_raw_sample == 16 && f->transparency){

             f->packed_at_lsb = 1;

             switch(16 * f->chroma_h_shift + f->chroma_v_shift) {
             case 0x00: f->avctx->pix_fmt = AV_PIX_FMT_YUVA444P16; break;
             case 0x10: f->avctx->pix_fmt = AV_PIX_FMT_YUVA422P16; break;
             case 0x11: f->avctx->pix_fmt = AV_PIX_FMT_YUVA420P16; break;
             }

         }
     } 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 AVERROR(ENOSYS);

         }

         if (     f->avctx->bits_per_raw_sample <=  8 && !f->transparency)
             f->avctx->pix_fmt = AV_PIX_FMT_0RGB32;
         else if (f->avctx->bits_per_raw_sample <=  8 && f->transparency)
             f->avctx->pix_fmt = AV_PIX_FMT_RGB32;
         else if (f->avctx->bits_per_raw_sample ==  9 && !f->transparency)

             f->avctx->pix_fmt = AV_PIX_FMT_GBRP9;

         else if (f->avctx->bits_per_raw_sample == 10 && !f->transparency)

             f->avctx->pix_fmt = AV_PIX_FMT_GBRP10;

         else if (f->avctx->bits_per_raw_sample == 10 && f->transparency)
             f->avctx->pix_fmt = AV_PIX_FMT_GBRAP10;

         else if (f->avctx->bits_per_raw_sample == 12 && !f->transparency)

             f->avctx->pix_fmt = AV_PIX_FMT_GBRP12;

         else if (f->avctx->bits_per_raw_sample == 12 && f->transparency)
             f->avctx->pix_fmt = AV_PIX_FMT_GBRAP12;

         else if (f->avctx->bits_per_raw_sample == 14 && !f->transparency)

             f->avctx->pix_fmt = AV_PIX_FMT_GBRP14;

         else if (f->avctx->bits_per_raw_sample == 16 && !f->transparency) {
             f->avctx->pix_fmt = AV_PIX_FMT_GBRP16;
             f->use32bit = 1;
         }

         else if (f->avctx->bits_per_raw_sample == 16 && f->transparency) {
             f->avctx->pix_fmt = AV_PIX_FMT_GBRAP16;
             f->use32bit = 1;
         }

     } else {
         av_log(f->avctx, AV_LOG_ERROR, "colorspace not supported\n");

         return AVERROR(ENOSYS);

     }

     if (f->avctx->pix_fmt == AV_PIX_FMT_NONE) {
         av_log(f->avctx, AV_LOG_ERROR, "format not supported\n");
         return AVERROR(ENOSYS);
     }

     ff_dlog(f->avctx, "%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 AVERROR_INVALIDDATA;

         }

         f->slice_count = f->max_slice_count;

     } else if (f->version < 3) {
         f->slice_count = get_symbol(c, state, 0);
     } else {
         const uint8_t *p = c->bytestream_end;

         for (f->slice_count = 0;

              f->slice_count < MAX_SLICES && 3 + 5*!!f->ec < p - c->bytestream_start;

              f->slice_count++) {

             int trailer = 3 + 5*!!f->ec;
             int size = AV_RB24(p-trailer);
             if (size + trailer > p - c->bytestream_start)
                 break;
             p -= size + trailer;
         }
     }

     if (f->slice_count > (unsigned)MAX_SLICES || f->slice_count <= 0 || f->slice_count > f->max_slice_count) {
         av_log(f->avctx, AV_LOG_ERROR, "slice count %d is invalid (max=%d)\n", f->slice_count, f->max_slice_count);

         return AVERROR_INVALIDDATA;

     }
 
     for (j = 0; j < f->slice_count; j++) {
         FFV1Context *fs = f->slice_context[j];

         fs->ac            = f->ac;

         fs->packed_at_lsb = f->packed_at_lsb;
 
         fs->slice_damaged = 0;
 
         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 AVERROR_INVALIDDATA;

             if (   (unsigned)fs->slice_x + (uint64_t)fs->slice_width  > f->width
                 || (unsigned)fs->slice_y + (uint64_t)fs->slice_height > f->height)

                 return AVERROR_INVALIDDATA;

         }
 
         for (i = 0; i < f->plane_count; i++) {
             PlaneContext *const p = &fs->plane[i];
 
             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 AVERROR_INVALIDDATA;

                 }
                 p->quant_table_index = idx;
                 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->version <= 2) {
                 av_assert0(context_count >= 0);
                 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 *f = avctx->priv_data;

     int ret;

     if ((ret = ff_ffv1_common_init(avctx)) < 0)

         return ret;

     if (avctx->extradata_size > 0 && (ret = read_extra_header(f)) < 0)

         return ret;

     if ((ret = ff_ffv1_init_slice_contexts(f)) < 0)

         return ret;

     avctx->internal->allocate_progress = 1;
 

     return 0;
 }
 

 static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)

 {

     uint8_t *buf        = avpkt->data;

     int buf_size        = avpkt->size;
     FFV1Context *f      = avctx->priv_data;
     RangeCoder *const c = &f->slice_context[0]->c;

     int i, ret;

     uint8_t keystate = 128;

     uint8_t *buf_p;

     AVFrame *p;

     if (f->last_picture.f)
         ff_thread_release_buffer(avctx, &f->last_picture);
     FFSWAP(ThreadFrame, f->picture, f->last_picture);
 
     f->cur = p = f->picture.f;

     if (f->version < 3 && avctx->field_order > AV_FIELD_PROGRESSIVE) {
         /* we have interlaced material flagged in container */
         p->interlaced_frame = 1;
         if (avctx->field_order == AV_FIELD_TT || avctx->field_order == AV_FIELD_TB)
             p->top_field_first = 1;
     }
 

     f->avctx = avctx;

     ff_init_range_decoder(c, buf, buf_size);
     ff_build_rac_states(c, 0.05 * (1LL << 32), 256 - 8);
 

     p->pict_type = AV_PICTURE_TYPE_I; //FIXME I vs. P

     if (get_rac(c, &keystate)) {

         p->key_frame    = 1;

         f->key_frame_ok = 0;

         if ((ret = read_header(f)) < 0)
             return ret;

         f->key_frame_ok = 1;
     } else {
         if (!f->key_frame_ok) {

             av_log(avctx, AV_LOG_ERROR,

                    "Cannot decode non-keyframe without valid keyframe\n");

             return AVERROR_INVALIDDATA;
         }

         p->key_frame = 0;

     }
 

     if ((ret = ff_thread_get_buffer(avctx, &f->picture, AV_GET_BUFFER_FLAG_REF)) < 0)

         return ret;

     if (avctx->debug & FF_DEBUG_PICT_INFO)

         av_log(avctx, AV_LOG_DEBUG, "ver:%d keyframe:%d coder:%d ec:%d slices:%d bps:%d\n",
                f->version, p->key_frame, f->ac, f->ec, f->slice_count, f->avctx->bits_per_raw_sample);
 

     ff_thread_finish_setup(avctx);
 

     buf_p = buf + buf_size;
     for (i = f->slice_count - 1; i >= 0; i--) {
         FFV1Context *fs = f->slice_context[i];
         int trailer = 3 + 5*!!f->ec;
         int v;
 

         if (i || f->version > 2) v = AV_RB24(buf_p-trailer) + trailer;
         else                     v = buf_p - c->bytestream_start;

         if (buf_p - c->bytestream_start < v) {
             av_log(avctx, AV_LOG_ERROR, "Slice pointer chain broken\n");

             ff_thread_report_progress(&f->picture, INT_MAX, 0);

             return AVERROR_INVALIDDATA;

         }
         buf_p -= v;
 
         if (f->ec) {
             unsigned crc = av_crc(av_crc_get_table(AV_CRC_32_IEEE), 0, buf_p, v);
             if (crc) {
                 int64_t ts = avpkt->pts != AV_NOPTS_VALUE ? avpkt->pts : avpkt->dts;
                 av_log(f->avctx, AV_LOG_ERROR, "CRC mismatch %X!", crc);
                 if (ts != AV_NOPTS_VALUE && avctx->pkt_timebase.num) {
                     av_log(f->avctx, AV_LOG_ERROR, "at %f seconds\n", ts*av_q2d(avctx->pkt_timebase));
                 } else if (ts != AV_NOPTS_VALUE) {
                     av_log(f->avctx, AV_LOG_ERROR, "at %"PRId64"\n", ts);
                 } else {
                     av_log(f->avctx, AV_LOG_ERROR, "\n");
                 }
                 fs->slice_damaged = 1;
             }

             if (avctx->debug & FF_DEBUG_PICT_INFO) {

                 av_log(avctx, AV_LOG_DEBUG, "slice %d, CRC: 0x%08"PRIX32"\n", i, AV_RB32(buf_p + v - 4));

             }

         }
 
         if (i) {
             ff_init_range_decoder(&fs->c, buf_p, v);
         } else

             fs->c.bytestream_end = buf_p + v;

         fs->avctx = avctx;

         fs->cur = p;

     }
 

     avctx->execute(avctx,
                    decode_slice,
                    &f->slice_context[0],
                    NULL,

                    f->slice_count,

                    sizeof(void*));

     for (i = f->slice_count - 1; i >= 0; i--) {
         FFV1Context *fs = f->slice_context[i];

         int j;

         if (fs->slice_damaged && f->last_picture.f->data[0]) {

             const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(avctx->pix_fmt);

             const uint8_t *src[4];
             uint8_t *dst[4];

             ff_thread_await_progress(&f->last_picture, INT_MAX, 0);

             for (j = 0; j < desc->nb_components; j++) {

                 int pixshift = desc->comp[j].depth > 8;

                 int sh = (j == 1 || j == 2) ? f->chroma_h_shift : 0;
                 int sv = (j == 1 || j == 2) ? f->chroma_v_shift : 0;

                 dst[j] = p->data[j] + p->linesize[j] *

                          (fs->slice_y >> sv) + ((fs->slice_x >> sh) << pixshift);

                 src[j] = f->last_picture.f->data[j] + f->last_picture.f->linesize[j] *

                          (fs->slice_y >> sv) + ((fs->slice_x >> sh) << pixshift);

 
             }
             if (desc->flags & AV_PIX_FMT_FLAG_PAL ||

                 desc->flags & FF_PSEUDOPAL) {

                 dst[1] = p->data[1];
                 src[1] = f->last_picture.f->data[1];

             }

             av_image_copy(dst, p->linesize, src,

                           f->last_picture.f->linesize,

                           avctx->pix_fmt,
                           fs->slice_width,

                           fs->slice_height);

         }
     }

     ff_thread_report_progress(&f->picture, INT_MAX, 0);

 
     f->picture_number++;
 

     if (f->last_picture.f)
         ff_thread_release_buffer(avctx, &f->last_picture);

     f->cur = NULL;

     if ((ret = av_frame_ref(data, f->picture.f)) < 0)
         return ret;

     *got_frame = 1;

 
     return buf_size;
 }
 

 #if HAVE_THREADS

 static int init_thread_copy(AVCodecContext *avctx)
 {
     FFV1Context *f = avctx->priv_data;

     int i, ret;

     f->picture.f      = NULL;
     f->last_picture.f = NULL;
     f->sample_buffer  = NULL;

     f->max_slice_count = 0;

     f->slice_count = 0;
 

     for (i = 0; i < f->quant_table_count; i++) {
         av_assert0(f->version > 1);
         f->initial_states[i] = av_memdup(f->initial_states[i],
                                          f->context_count[i] * sizeof(*f->initial_states[i]));
     }
 

     f->picture.f      = av_frame_alloc();
     f->last_picture.f = av_frame_alloc();
 

     if ((ret = ff_ffv1_init_slice_contexts(f)) < 0)

         return ret;
 

     return 0;
 }

 #endif

 static void copy_fields(FFV1Context *fsdst, FFV1Context *fssrc, FFV1Context *fsrc)
 {
     fsdst->version             = fsrc->version;
     fsdst->micro_version       = fsrc->micro_version;
     fsdst->chroma_planes       = fsrc->chroma_planes;
     fsdst->chroma_h_shift      = fsrc->chroma_h_shift;
     fsdst->chroma_v_shift      = fsrc->chroma_v_shift;
     fsdst->transparency        = fsrc->transparency;
     fsdst->plane_count         = fsrc->plane_count;
     fsdst->ac                  = fsrc->ac;
     fsdst->colorspace          = fsrc->colorspace;
 
     fsdst->ec                  = fsrc->ec;
     fsdst->intra               = fsrc->intra;
     fsdst->slice_damaged       = fssrc->slice_damaged;
     fsdst->key_frame_ok        = fsrc->key_frame_ok;
 
     fsdst->bits_per_raw_sample = fsrc->bits_per_raw_sample;
     fsdst->packed_at_lsb       = fsrc->packed_at_lsb;
     fsdst->slice_count         = fsrc->slice_count;
     if (fsrc->version<3){
         fsdst->slice_x             = fssrc->slice_x;
         fsdst->slice_y             = fssrc->slice_y;
         fsdst->slice_width         = fssrc->slice_width;
         fsdst->slice_height        = fssrc->slice_height;
     }
 }
 

 #if HAVE_THREADS

 static int update_thread_context(AVCodecContext *dst, const AVCodecContext *src)
 {
     FFV1Context *fsrc = src->priv_data;
     FFV1Context *fdst = dst->priv_data;
     int i, ret;
 
     if (dst == src)
         return 0;
 

     {

         ThreadFrame picture = fdst->picture, last_picture = fdst->last_picture;
         uint8_t (*initial_states[MAX_QUANT_TABLES])[32];
         struct FFV1Context *slice_context[MAX_SLICES];
         memcpy(initial_states, fdst->initial_states, sizeof(fdst->initial_states));
         memcpy(slice_context,  fdst->slice_context , sizeof(fdst->slice_context));
 

         memcpy(fdst, fsrc, sizeof(*fdst));

         memcpy(fdst->initial_states, initial_states, sizeof(fdst->initial_states));
         memcpy(fdst->slice_context,  slice_context , sizeof(fdst->slice_context));
         fdst->picture      = picture;
         fdst->last_picture = last_picture;

         for (i = 0; i<fdst->num_h_slices * fdst->num_v_slices; i++) {
             FFV1Context *fssrc = fsrc->slice_context[i];
             FFV1Context *fsdst = fdst->slice_context[i];
             copy_fields(fsdst, fssrc, fsrc);
         }
         av_assert0(!fdst->plane[0].state);
         av_assert0(!fdst->sample_buffer);

     }
 

     av_assert1(fdst->max_slice_count == fsrc->max_slice_count);

 
 
     ff_thread_release_buffer(dst, &fdst->picture);
     if (fsrc->picture.f->data[0]) {
         if ((ret = ff_thread_ref_frame(&fdst->picture, &fsrc->picture)) < 0)
             return ret;
     }
 
     fdst->fsrc = fsrc;
 

     return 0;
 }

 #endif

 AVCodec ff_ffv1_decoder = {
     .name           = "ffv1",

     .long_name      = NULL_IF_CONFIG_SMALL("FFmpeg video codec #1"),

     .type           = AVMEDIA_TYPE_VIDEO,
     .id             = AV_CODEC_ID_FFV1,
     .priv_data_size = sizeof(FFV1Context),
     .init           = decode_init,

     .close          = ff_ffv1_close,

     .decode         = decode_frame,

     .init_thread_copy = ONLY_IF_THREADS_ENABLED(init_thread_copy),
     .update_thread_context = ONLY_IF_THREADS_ENABLED(update_thread_context),

     .capabilities   = AV_CODEC_CAP_DR1 /*| AV_CODEC_CAP_DRAW_HORIZ_BAND*/ |

                       AV_CODEC_CAP_FRAME_THREADS | AV_CODEC_CAP_SLICE_THREADS,

     .caps_internal  = FF_CODEC_CAP_INIT_CLEANUP

 };