/* * Copyright (c) 2004 Gildas Bazin * Copyright (c) 2010 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 "config.h" #include "libavutil/attributes.h" #include "libavutil/intreadwrite.h" #include "dcadsp.h" static void dca_lfe_fir_c(float *out, const float *in, const float *coefs, int decifactor, float scale) { float *out2 = out + decifactor; const float *cf0 = coefs; const float *cf1 = coefs + 256; int j, k; /* One decimated sample generates 2*decifactor interpolated ones */ for (k = 0; k < decifactor; k++) { float v0 = 0.0; float v1 = 0.0; for (j = 0; j < 256 / decifactor; j++) { float s = in[-j]; v0 += s * *cf0++; v1 += s * *--cf1; } *out++ = v0 * scale; *out2++ = v1 * scale; } } static void dca_qmf_32_subbands(float samples_in[32][8], int sb_act, SynthFilterContext *synth, FFTContext *imdct, float synth_buf_ptr[512], int *synth_buf_offset, float synth_buf2[32], const float window[512], float *samples_out, float raXin[32], float scale) { int i; int subindex; for (i = sb_act; i < 32; i++) raXin[i] = 0.0; /* Reconstructed channel sample index */ for (subindex = 0; subindex < 8; subindex++) { /* Load in one sample from each subband and clear inactive subbands */ for (i = 0; i < sb_act; i++) { unsigned sign = (i - 1) & 2; uint32_t v = AV_RN32A(&samples_in[i][subindex]) ^ sign << 30; AV_WN32A(&raXin[i], v); } synth->synth_filter_float(imdct, synth_buf_ptr, synth_buf_offset, synth_buf2, window, samples_out, raXin, scale); samples_out += 32; } } av_cold void ff_dcadsp_init(DCADSPContext *s) { s->lfe_fir = dca_lfe_fir_c; s->qmf_32_subbands = dca_qmf_32_subbands; if (ARCH_ARM) ff_dcadsp_init_arm(s); }