Skip to content
This repository

HTTPS clone URL

Subversion checkout URL

You can clone with HTTPS or Subversion.

Download ZIP
Fetching contributors…

Cannot retrieve contributors at this time

file 126 lines (110 sloc) 3.71 kb
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126
/*
* Copyright (c) 2012 Mans Rullgard <mans@mansr.com>
*
* 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
*/

#include "libavutil/attributes.h"
#include "libavutil/samplefmt.h"
#include "flacdsp.h"
#include "config.h"

#define SAMPLE_SIZE 16
#define PLANAR 0
#include "flacdsp_template.c"

#undef PLANAR
#define PLANAR 1
#include "flacdsp_template.c"

#undef SAMPLE_SIZE
#undef PLANAR
#define SAMPLE_SIZE 32
#define PLANAR 0
#include "flacdsp_template.c"

#undef PLANAR
#define PLANAR 1
#include "flacdsp_template.c"

static void flac_lpc_16_c(int32_t *decoded, const int coeffs[32],
                          int pred_order, int qlevel, int len)
{
    int i, j;

    for (i = pred_order; i < len - 1; i += 2, decoded += 2) {
        int c = coeffs[0];
        int d = decoded[0];
        int s0 = 0, s1 = 0;
        for (j = 1; j < pred_order; j++) {
            s0 += c*d;
            d = decoded[j];
            s1 += c*d;
            c = coeffs[j];
        }
        s0 += c*d;
        d = decoded[j] += s0 >> qlevel;
        s1 += c*d;
        decoded[j + 1] += s1 >> qlevel;
    }
    if (i < len) {
        int sum = 0;
        for (j = 0; j < pred_order; j++)
            sum += coeffs[j] * decoded[j];
        decoded[j] += sum >> qlevel;
    }
}

static void flac_lpc_32_c(int32_t *decoded, const int coeffs[32],
                          int pred_order, int qlevel, int len)
{
    int i, j;

    for (i = pred_order; i < len; i++, decoded++) {
        int64_t sum = 0;
        for (j = 0; j < pred_order; j++)
            sum += (int64_t)coeffs[j] * decoded[j];
        decoded[j] += sum >> qlevel;
    }

}

av_cold void ff_flacdsp_init(FLACDSPContext *c, enum AVSampleFormat fmt,
                             int bps)
{
    if (bps > 16)
        c->lpc = flac_lpc_32_c;
    else
        c->lpc = flac_lpc_16_c;

    switch (fmt) {
    case AV_SAMPLE_FMT_S32:
        c->decorrelate[0] = flac_decorrelate_indep_c_32;
        c->decorrelate[1] = flac_decorrelate_ls_c_32;
        c->decorrelate[2] = flac_decorrelate_rs_c_32;
        c->decorrelate[3] = flac_decorrelate_ms_c_32;
        break;

    case AV_SAMPLE_FMT_S32P:
        c->decorrelate[0] = flac_decorrelate_indep_c_32p;
        c->decorrelate[1] = flac_decorrelate_ls_c_32p;
        c->decorrelate[2] = flac_decorrelate_rs_c_32p;
        c->decorrelate[3] = flac_decorrelate_ms_c_32p;
        break;

    case AV_SAMPLE_FMT_S16:
        c->decorrelate[0] = flac_decorrelate_indep_c_16;
        c->decorrelate[1] = flac_decorrelate_ls_c_16;
        c->decorrelate[2] = flac_decorrelate_rs_c_16;
        c->decorrelate[3] = flac_decorrelate_ms_c_16;
        break;

    case AV_SAMPLE_FMT_S16P:
        c->decorrelate[0] = flac_decorrelate_indep_c_16p;
        c->decorrelate[1] = flac_decorrelate_ls_c_16p;
        c->decorrelate[2] = flac_decorrelate_rs_c_16p;
        c->decorrelate[3] = flac_decorrelate_ms_c_16p;
        break;
    }

    if (ARCH_ARM)
        ff_flacdsp_init_arm(c, fmt, bps);
}
Something went wrong with that request. Please try again.