/* * 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
*/
staticvoid flac_lpc_16_c(int32_t *decoded, constint coeffs[32], int pred_order, int qlevel, int len)
{ int i, j;
for (i = pred_order; i < len - 1; i += 2, decoded += 2) {
SUINT c = coeffs[0];
SUINT 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] += (SUINT)(s0 >> qlevel);
s1 += c*d;
decoded[j + 1] += (SUINT)(s1 >> qlevel);
} if (i < len) { int sum = 0; for (j = 0; j < pred_order; j++)
sum += coeffs[j] * (SUINT)decoded[j];
decoded[j] = decoded[j] + (unsigned)(sum >> qlevel);
}
}
staticvoid flac_lpc_32_c(int32_t *decoded, constint 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;
}
}
staticvoid flac_lpc_33_c(int64_t *decoded, const int32_t *residual, constint 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] * (uint64_t)decoded[j];
decoded[j] = residual[i] + (sum >> qlevel);
}
}
staticvoid flac_wasted_32_c(int32_t *decoded, int wasted, int len)
{ for (int i = 0; i < len; i++)
decoded[i] = (unsigned)decoded[i] << wasted;
}
staticvoid flac_wasted_33_c(int64_t *decoded, const int32_t *residual, int wasted, int len)
{ for (int i = 0; i < len; i++)
decoded[i] = (uint64_t)residual[i] << wasted;
}
Die Informationen auf dieser Webseite wurden
nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit,
noch Qualität der bereit gestellten Informationen zugesichert.
Bemerkung:
Die farbliche Syntaxdarstellung und die Messung sind noch experimentell.