GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/alacdsp.c Lines: 20 20 100.0 %
Date: 2019-11-22 03:34:36 Branches: 6 6 100.0 %

Line Branch Exec Source
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/*
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 * ALAC (Apple Lossless Audio Codec) decoder
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 * Copyright (c) 2005 David Hammerton
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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 "libavutil/attributes.h"
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#include "alacdsp.h"
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#include "config.h"
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static void decorrelate_stereo(int32_t *buffer[2], int nb_samples,
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                               int decorr_shift, int decorr_left_weight)
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{
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    int i;
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    for (i = 0; i < nb_samples; i++) {
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        int32_t a, b;
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        a = buffer[0][i];
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        b = buffer[1][i];
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        a -= (b * decorr_left_weight) >> decorr_shift;
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        b += a;
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        buffer[0][i] = b;
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        buffer[1][i] = a;
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    }
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}
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static void append_extra_bits(int32_t *buffer[2], int32_t *extra_bits_buffer[2],
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                              int extra_bits, int channels, int nb_samples)
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{
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    int i, ch;
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    for (ch = 0; ch < channels; ch++)
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        for (i = 0; i < nb_samples; i++)
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            buffer[ch][i] = (buffer[ch][i] << extra_bits) | extra_bits_buffer[ch][i];
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}
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av_cold void ff_alacdsp_init(ALACDSPContext *c)
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{
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    c->decorrelate_stereo   = decorrelate_stereo;
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    c->append_extra_bits[0] =
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    c->append_extra_bits[1] = append_extra_bits;
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    if (ARCH_X86)
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        ff_alacdsp_init_x86(c);
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}