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51 lines
1.5 KiB
51 lines
1.5 KiB
/* |
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* AC-3 DSP utils |
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* Copyright (c) 2011 Justin Ruggles |
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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 |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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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 |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* 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 |
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*/ |
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#include "avcodec.h" |
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#include "ac3dsp.h" |
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static void ac3_exponent_min_c(uint8_t *exp, int num_reuse_blocks, int nb_coefs) |
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{ |
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int blk, i; |
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if (!num_reuse_blocks) |
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return; |
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for (i = 0; i < nb_coefs; i++) { |
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uint8_t min_exp = *exp; |
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uint8_t *exp1 = exp + 256; |
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for (blk = 0; blk < num_reuse_blocks; blk++) { |
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uint8_t next_exp = *exp1; |
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if (next_exp < min_exp) |
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min_exp = next_exp; |
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exp1 += 256; |
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} |
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*exp++ = min_exp; |
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} |
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} |
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av_cold void ff_ac3dsp_init(AC3DSPContext *c) |
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{ |
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c->ac3_exponent_min = ac3_exponent_min_c; |
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if (HAVE_MMX) |
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ff_ac3dsp_init_x86(c); |
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}
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