/*
  * huffyuv codec for libavcodec
  *

  * Copyright (c) 2002-2003 Michael Niedermayer <michaelni@gmx.at>

  *

  * see http://www.pcisys.net/~melanson/codecs/huffyuv.txt for a description of
  * the algorithm used
  *

  * 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

  * huffyuv codec for libavcodec.
  */

 #include <stdint.h>

 #include "libavutil/mem.h"

 #include "avcodec.h"
 #include "huffyuv.h"

 int ff_huffyuv_generate_bits_table(uint32_t *dst, const uint8_t *len_table)

 {

     int len, index;

     uint32_t bits = 0;

     for (len = 32; len > 0; len--) {
         for (index = 0; index < 256; index++) {
             if (len_table[index] == len)
                 dst[index] = bits++;

         }

         if (bits & 1) {

             av_log(NULL, AV_LOG_ERROR, "Error generating huffman table\n");

             return -1;
         }
         bits >>= 1;

     }
     return 0;
 }
 

 av_cold int ff_huffyuv_alloc_temp(HYuvContext *s)

 {

     int i;

     if (s->bitstream_bpp<24) {
         for (i=0; i<3; i++) {

             s->temp[i]= av_malloc(s->width + 16);

             if (!s->temp[i])
                 return AVERROR(ENOMEM);

         }

     } else {

         s->temp[0]= av_mallocz(4*s->width + 16);

         if (!s->temp[0])
             return AVERROR(ENOMEM);

     }

     return 0;

 }
 

 av_cold void ff_huffyuv_common_init(AVCodecContext *avctx)

 {

     HYuvContext *s = avctx->priv_data;
 

     s->avctx = avctx;
     s->flags = avctx->flags;

     ff_dsputil_init(&s->dsp, avctx);

     s->width = avctx->width;
     s->height = avctx->height;

     av_assert1(s->width > 0 && s->height > 0);

 }
 

 av_cold void ff_huffyuv_common_end(HYuvContext *s)

 {
     int i;
 
     for(i = 0; i < 3; i++) {
         av_freep(&s->temp[i]);
     }

 }