mirror of https://github.com/FFmpeg/FFmpeg.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
123 lines
3.5 KiB
123 lines
3.5 KiB
/* |
|
* Copyright (c) 2012 Mans Rullgard <mans@mansr.com> |
|
* |
|
* This file is part of Libav. |
|
* |
|
* Libav 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. |
|
* |
|
* Libav 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 Libav; 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" |
|
|
|
#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) { |
|
int c; |
|
int d = decoded[i-pred_order]; |
|
int s0 = 0, s1 = 0; |
|
for (j = pred_order-1; j > 0; j--) { |
|
c = coeffs[j]; |
|
s0 += c*d; |
|
d = decoded[i-j]; |
|
s1 += c*d; |
|
} |
|
c = coeffs[0]; |
|
s0 += c*d; |
|
d = decoded[i] += s0 >> qlevel; |
|
s1 += c*d; |
|
decoded[i+1] += s1 >> qlevel; |
|
} |
|
if (i < len) { |
|
int sum = 0; |
|
for (j = 0; j < pred_order; j++) |
|
sum += coeffs[j] * decoded[i-j-1]; |
|
decoded[i] += 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++) { |
|
int64_t sum = 0; |
|
for (j = 0; j < pred_order; j++) |
|
sum += (int64_t)coeffs[j] * decoded[i-j-1]; |
|
decoded[i] += 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; |
|
} |
|
}
|
|
|