libavcodec/fdctdsp.c
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 /*
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  * This file is part of FFmpeg.
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  *
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  * FFmpeg is free software; you can redistribute it and/or
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  * 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.
  *
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  * FFmpeg is distributed in the hope that it will be useful,
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  * 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
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  * License along with FFmpeg; if not, write to the Free Software
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  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include "libavutil/attributes.h"
 #include "avcodec.h"
 #include "dct.h"
 #include "faandct.h"
 #include "fdctdsp.h"
 #include "config.h"
 
 av_cold void ff_fdctdsp_init(FDCTDSPContext *c, AVCodecContext *avctx)
 {
     const unsigned high_bit_depth = avctx->bits_per_raw_sample > 8;
 
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     if (avctx->bits_per_raw_sample == 10 || avctx->bits_per_raw_sample == 9) {
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         c->fdct    = ff_jpeg_fdct_islow_10;
         c->fdct248 = ff_fdct248_islow_10;
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     } else if (avctx->dct_algo == FF_DCT_FASTINT) {
         c->fdct    = ff_fdct_ifast;
         c->fdct248 = ff_fdct_ifast248;
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 #if CONFIG_FAANDCT
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     } else if (avctx->dct_algo == FF_DCT_FAAN) {
         c->fdct    = ff_faandct;
         c->fdct248 = ff_faandct248;
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 #endif /* CONFIG_FAANDCT */
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     } else {
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         c->fdct    = ff_jpeg_fdct_islow_8; // slow/accurate/default
         c->fdct248 = ff_fdct248_islow_8;
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     }
 
     if (ARCH_PPC)
         ff_fdctdsp_init_ppc(c, avctx, high_bit_depth);
     if (ARCH_X86)
         ff_fdctdsp_init_x86(c, avctx, high_bit_depth);
 }