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123 lines
3.6 KiB
123 lines
3.6 KiB
/* |
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* Copyright (c) 2012 Mans Rullgard <mans@mansr.com> |
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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 "libavutil/samplefmt.h" |
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#include "flacdsp.h" |
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#define SAMPLE_SIZE 16 |
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#define PLANAR 0 |
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#include "flacdsp_template.c" |
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#undef PLANAR |
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#define PLANAR 1 |
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#include "flacdsp_template.c" |
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#undef SAMPLE_SIZE |
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#undef PLANAR |
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#define SAMPLE_SIZE 32 |
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#define PLANAR 0 |
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#include "flacdsp_template.c" |
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#undef PLANAR |
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#define PLANAR 1 |
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#include "flacdsp_template.c" |
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static void flac_lpc_16_c(int32_t *decoded, const int coeffs[32], |
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int pred_order, int qlevel, int len) |
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{ |
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int i, j; |
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for (i = pred_order; i < len - 1; i += 2) { |
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int c; |
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int d = decoded[i-pred_order]; |
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int s0 = 0, s1 = 0; |
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for (j = pred_order-1; j > 0; j--) { |
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c = coeffs[j]; |
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s0 += c*d; |
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d = decoded[i-j]; |
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s1 += c*d; |
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} |
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c = coeffs[0]; |
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s0 += c*d; |
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d = decoded[i] += s0 >> qlevel; |
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s1 += c*d; |
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decoded[i+1] += s1 >> qlevel; |
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} |
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if (i < len) { |
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int sum = 0; |
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for (j = 0; j < pred_order; j++) |
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sum += coeffs[j] * decoded[i-j-1]; |
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decoded[i] += sum >> qlevel; |
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} |
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} |
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static void flac_lpc_32_c(int32_t *decoded, const int coeffs[32], |
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int pred_order, int qlevel, int len) |
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{ |
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int i, j; |
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for (i = pred_order; i < len; i++) { |
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int64_t sum = 0; |
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for (j = 0; j < pred_order; j++) |
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sum += (int64_t)coeffs[j] * decoded[i-j-1]; |
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decoded[i] += sum >> qlevel; |
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} |
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} |
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av_cold void ff_flacdsp_init(FLACDSPContext *c, enum AVSampleFormat fmt, |
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int bps) |
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{ |
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if (bps > 16) |
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c->lpc = flac_lpc_32_c; |
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else |
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c->lpc = flac_lpc_16_c; |
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switch (fmt) { |
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case AV_SAMPLE_FMT_S32: |
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c->decorrelate[0] = flac_decorrelate_indep_c_32; |
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c->decorrelate[1] = flac_decorrelate_ls_c_32; |
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c->decorrelate[2] = flac_decorrelate_rs_c_32; |
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c->decorrelate[3] = flac_decorrelate_ms_c_32; |
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break; |
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case AV_SAMPLE_FMT_S32P: |
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c->decorrelate[0] = flac_decorrelate_indep_c_32p; |
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c->decorrelate[1] = flac_decorrelate_ls_c_32p; |
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c->decorrelate[2] = flac_decorrelate_rs_c_32p; |
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c->decorrelate[3] = flac_decorrelate_ms_c_32p; |
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break; |
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case AV_SAMPLE_FMT_S16: |
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c->decorrelate[0] = flac_decorrelate_indep_c_16; |
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c->decorrelate[1] = flac_decorrelate_ls_c_16; |
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c->decorrelate[2] = flac_decorrelate_rs_c_16; |
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c->decorrelate[3] = flac_decorrelate_ms_c_16; |
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break; |
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case AV_SAMPLE_FMT_S16P: |
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c->decorrelate[0] = flac_decorrelate_indep_c_16p; |
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c->decorrelate[1] = flac_decorrelate_ls_c_16p; |
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c->decorrelate[2] = flac_decorrelate_rs_c_16p; |
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c->decorrelate[3] = flac_decorrelate_ms_c_16p; |
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break; |
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} |
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}
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