GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/dsd.c Lines: 32 32 100.0 %
Date: 2021-04-18 21:26:34 Branches: 13 14 92.9 %

Line Branch Exec Source
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/*
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 * Direct Stream Digital (DSD) decoder
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 * based on BSD licensed dsd2pcm by Sebastian Gesemann
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 * Copyright (c) 2009, 2011 Sebastian Gesemann. All rights reserved.
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 * Copyright (c) 2014 Peter Ross
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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/thread.h"
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#include "libavcodec/internal.h"
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#include "libavcodec/mathops.h"
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#include "avcodec.h"
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#include "dsd_tablegen.h"
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#include "dsd.h"
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static av_cold void dsd_ctables_tableinit(void)
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{
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    int t, e, m, sign;
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    double acc[CTABLES];
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    for (e = 0; e < 256; ++e) {
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        memset(acc, 0, sizeof(acc));
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        for (m = 0; m < 8; ++m) {
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            sign = (((e >> (7 - m)) & 1) * 2 - 1);
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            for (t = 0; t < CTABLES; ++t)
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                acc[t] += sign * htaps[t * 8 + m];
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        }
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        for (t = 0; t < CTABLES; ++t)
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            ctables[CTABLES - 1 - t][e] = acc[t];
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    }
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}
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av_cold void ff_init_dsd_data(void)
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{
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    static AVOnce init_static_once = AV_ONCE_INIT;
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    ff_thread_once(&init_static_once, dsd_ctables_tableinit);
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}
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void ff_dsd2pcm_translate(DSDContext* s, size_t samples, int lsbf,
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                          const uint8_t *src, ptrdiff_t src_stride,
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                          float *dst, ptrdiff_t dst_stride)
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{
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    uint8_t buf[FIFOSIZE];
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    unsigned pos, i;
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    uint8_t* p;
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    double sum;
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    pos = s->pos;
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    memcpy(buf, s->buf, sizeof(buf));
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    while (samples-- > 0) {
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        buf[pos] = lsbf ? ff_reverse[*src] : *src;
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        src += src_stride;
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        p = buf + ((pos - CTABLES) & FIFOMASK);
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        *p = ff_reverse[*p];
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        sum = 0.0;
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        for (i = 0; i < CTABLES; i++) {
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            uint8_t a = buf[(pos                   - i) & FIFOMASK];
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            uint8_t b = buf[(pos - (CTABLES*2 - 1) + i) & FIFOMASK];
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            sum += ctables[i][a] + ctables[i][b];
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        }
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        *dst = (float)sum;
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        dst += dst_stride;
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        pos = (pos + 1) & FIFOMASK;
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    }
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    s->pos = pos;
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    memcpy(s->buf, buf, sizeof(buf));
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}