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844 lines
19 KiB
C++
844 lines
19 KiB
C++
// basisu_resampler.cpp
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// Copyright (C) 2019 Binomial LLC. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "basisu_resampler.h"
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#include "basisu_resampler_filters.h"
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#define RESAMPLER_DEBUG 0
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namespace basisu
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{
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static inline int resampler_range_check(int v, int h)
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{
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BASISU_NOTE_UNUSED(h);
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assert((v >= 0) && (v < h));
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return v;
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}
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// Float to int cast with truncation.
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static inline int cast_to_int(Resample_Real i)
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{
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return (int)i;
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}
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// Ensure that the contributing source sample is within bounds. If not, reflect, clamp, or wrap.
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int Resampler::reflect(const int j, const int src_x, const Boundary_Op boundary_op)
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{
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int n;
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if (j < 0)
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{
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if (boundary_op == BOUNDARY_REFLECT)
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{
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n = -j;
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if (n >= src_x)
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n = src_x - 1;
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}
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else if (boundary_op == BOUNDARY_WRAP)
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n = posmod(j, src_x);
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else
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n = 0;
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}
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else if (j >= src_x)
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{
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if (boundary_op == BOUNDARY_REFLECT)
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{
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n = (src_x - j) + (src_x - 1);
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if (n < 0)
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n = 0;
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}
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else if (boundary_op == BOUNDARY_WRAP)
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n = posmod(j, src_x);
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else
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n = src_x - 1;
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}
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else
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n = j;
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return n;
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}
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// The make_clist() method generates, for all destination samples,
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// the list of all source samples with non-zero weighted contributions.
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Resampler::Contrib_List * Resampler::make_clist(
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int src_x, int dst_x, Boundary_Op boundary_op,
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Resample_Real(*Pfilter)(Resample_Real),
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Resample_Real filter_support,
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Resample_Real filter_scale,
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Resample_Real src_ofs)
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{
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struct Contrib_Bounds
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{
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// The center of the range in DISCRETE coordinates (pixel center = 0.0f).
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Resample_Real center;
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int left, right;
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};
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int i, j, k, n, left, right;
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Resample_Real total_weight;
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Resample_Real xscale, center, half_width, weight;
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Contrib_List* Pcontrib;
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Contrib* Pcpool;
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Contrib* Pcpool_next;
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Contrib_Bounds* Pcontrib_bounds;
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if ((Pcontrib = (Contrib_List*)calloc(dst_x, sizeof(Contrib_List))) == NULL)
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return NULL;
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Pcontrib_bounds = (Contrib_Bounds*)calloc(dst_x, sizeof(Contrib_Bounds));
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if (!Pcontrib_bounds)
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{
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free(Pcontrib);
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return (NULL);
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}
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const Resample_Real oo_filter_scale = 1.0f / filter_scale;
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const Resample_Real NUDGE = 0.5f;
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xscale = dst_x / (Resample_Real)src_x;
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if (xscale < 1.0f)
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{
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int total;
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(void)total;
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// Handle case when there are fewer destination samples than source samples (downsampling/minification).
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// stretched half width of filter
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half_width = (filter_support / xscale) * filter_scale;
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// Find the range of source sample(s) that will contribute to each destination sample.
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for (i = 0, n = 0; i < dst_x; i++)
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{
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// Convert from discrete to continuous coordinates, scale, then convert back to discrete.
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center = ((Resample_Real)i + NUDGE) / xscale;
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center -= NUDGE;
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center += src_ofs;
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left = cast_to_int((Resample_Real)floor(center - half_width));
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right = cast_to_int((Resample_Real)ceil(center + half_width));
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Pcontrib_bounds[i].center = center;
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Pcontrib_bounds[i].left = left;
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Pcontrib_bounds[i].right = right;
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n += (right - left + 1);
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}
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// Allocate memory for contributors.
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if ((n == 0) || ((Pcpool = (Contrib*)calloc(n, sizeof(Contrib))) == NULL))
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{
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free(Pcontrib);
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free(Pcontrib_bounds);
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return NULL;
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}
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total = n;
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Pcpool_next = Pcpool;
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// Create the list of source samples which contribute to each destination sample.
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for (i = 0; i < dst_x; i++)
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{
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int max_k = -1;
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Resample_Real max_w = -1e+20f;
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center = Pcontrib_bounds[i].center;
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left = Pcontrib_bounds[i].left;
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right = Pcontrib_bounds[i].right;
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Pcontrib[i].n = 0;
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Pcontrib[i].p = Pcpool_next;
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Pcpool_next += (right - left + 1);
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assert((Pcpool_next - Pcpool) <= total);
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total_weight = 0;
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for (j = left; j <= right; j++)
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total_weight += (*Pfilter)((center - (Resample_Real)j) * xscale * oo_filter_scale);
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const Resample_Real norm = static_cast<Resample_Real>(1.0f / total_weight);
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total_weight = 0;
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#if RESAMPLER_DEBUG
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printf("%i: ", i);
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#endif
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for (j = left; j <= right; j++)
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{
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weight = (*Pfilter)((center - (Resample_Real)j) * xscale * oo_filter_scale) * norm;
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if (weight == 0.0f)
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continue;
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n = reflect(j, src_x, boundary_op);
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#if RESAMPLER_DEBUG
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printf("%i(%f), ", n, weight);
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#endif
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// Increment the number of source samples which contribute to the current destination sample.
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k = Pcontrib[i].n++;
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Pcontrib[i].p[k].pixel = (unsigned short)n; /* store src sample number */
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Pcontrib[i].p[k].weight = weight; /* store src sample weight */
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total_weight += weight; /* total weight of all contributors */
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if (weight > max_w)
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{
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max_w = weight;
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max_k = k;
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}
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}
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#if RESAMPLER_DEBUG
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printf("\n\n");
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#endif
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//assert(Pcontrib[i].n);
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//assert(max_k != -1);
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if ((max_k == -1) || (Pcontrib[i].n == 0))
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{
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free(Pcpool);
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free(Pcontrib);
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free(Pcontrib_bounds);
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return NULL;
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}
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if (total_weight != 1.0f)
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Pcontrib[i].p[max_k].weight += 1.0f - total_weight;
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}
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}
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else
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{
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// Handle case when there are more destination samples than source samples (upsampling).
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half_width = filter_support * filter_scale;
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// Find the source sample(s) that contribute to each destination sample.
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for (i = 0, n = 0; i < dst_x; i++)
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{
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// Convert from discrete to continuous coordinates, scale, then convert back to discrete.
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center = ((Resample_Real)i + NUDGE) / xscale;
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center -= NUDGE;
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center += src_ofs;
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left = cast_to_int((Resample_Real)floor(center - half_width));
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right = cast_to_int((Resample_Real)ceil(center + half_width));
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Pcontrib_bounds[i].center = center;
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Pcontrib_bounds[i].left = left;
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Pcontrib_bounds[i].right = right;
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n += (right - left + 1);
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}
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/* Allocate memory for contributors. */
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int total = n;
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if ((total == 0) || ((Pcpool = (Contrib*)calloc(total, sizeof(Contrib))) == NULL))
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{
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free(Pcontrib);
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free(Pcontrib_bounds);
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return NULL;
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}
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Pcpool_next = Pcpool;
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// Create the list of source samples which contribute to each destination sample.
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for (i = 0; i < dst_x; i++)
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{
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int max_k = -1;
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Resample_Real max_w = -1e+20f;
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center = Pcontrib_bounds[i].center;
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left = Pcontrib_bounds[i].left;
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right = Pcontrib_bounds[i].right;
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Pcontrib[i].n = 0;
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Pcontrib[i].p = Pcpool_next;
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Pcpool_next += (right - left + 1);
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assert((Pcpool_next - Pcpool) <= total);
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total_weight = 0;
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for (j = left; j <= right; j++)
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total_weight += (*Pfilter)((center - (Resample_Real)j) * oo_filter_scale);
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const Resample_Real norm = static_cast<Resample_Real>(1.0f / total_weight);
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total_weight = 0;
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#if RESAMPLER_DEBUG
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printf("%i: ", i);
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#endif
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for (j = left; j <= right; j++)
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{
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weight = (*Pfilter)((center - (Resample_Real)j) * oo_filter_scale) * norm;
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if (weight == 0.0f)
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continue;
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n = reflect(j, src_x, boundary_op);
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#if RESAMPLER_DEBUG
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printf("%i(%f), ", n, weight);
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#endif
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// Increment the number of source samples which contribute to the current destination sample.
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k = Pcontrib[i].n++;
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Pcontrib[i].p[k].pixel = (unsigned short)n; /* store src sample number */
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Pcontrib[i].p[k].weight = weight; /* store src sample weight */
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total_weight += weight; /* total weight of all contributors */
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if (weight > max_w)
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{
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max_w = weight;
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max_k = k;
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}
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}
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#if RESAMPLER_DEBUG
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printf("\n\n");
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#endif
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//assert(Pcontrib[i].n);
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//assert(max_k != -1);
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if ((max_k == -1) || (Pcontrib[i].n == 0))
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{
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free(Pcpool);
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free(Pcontrib);
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free(Pcontrib_bounds);
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return NULL;
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}
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if (total_weight != 1.0f)
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Pcontrib[i].p[max_k].weight += 1.0f - total_weight;
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}
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}
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#if RESAMPLER_DEBUG
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printf("*******\n");
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#endif
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free(Pcontrib_bounds);
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return Pcontrib;
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}
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void Resampler::resample_x(Sample * Pdst, const Sample * Psrc)
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{
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assert(Pdst);
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assert(Psrc);
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int i, j;
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Sample total;
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Contrib_List* Pclist = m_Pclist_x;
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Contrib* p;
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for (i = m_resample_dst_x; i > 0; i--, Pclist++)
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{
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#if BASISU_RESAMPLER_DEBUG_OPS
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total_ops += Pclist->n;
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#endif
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for (j = Pclist->n, p = Pclist->p, total = 0; j > 0; j--, p++)
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total += Psrc[p->pixel] * p->weight;
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*Pdst++ = total;
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}
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}
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void Resampler::scale_y_mov(Sample * Ptmp, const Sample * Psrc, Resample_Real weight, int dst_x)
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{
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int i;
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#if BASISU_RESAMPLER_DEBUG_OPS
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total_ops += dst_x;
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#endif
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// Not += because temp buf wasn't cleared.
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for (i = dst_x; i > 0; i--)
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* Ptmp++ = *Psrc++ * weight;
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}
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void Resampler::scale_y_add(Sample * Ptmp, const Sample * Psrc, Resample_Real weight, int dst_x)
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{
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#if BASISU_RESAMPLER_DEBUG_OPS
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total_ops += dst_x;
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#endif
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for (int i = dst_x; i > 0; i--)
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(*Ptmp++) += *Psrc++ * weight;
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}
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void Resampler::clamp(Sample * Pdst, int n)
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{
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while (n > 0)
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{
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Sample x = *Pdst;
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*Pdst++ = clamp_sample(x);
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n--;
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}
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}
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void Resampler::resample_y(Sample * Pdst)
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{
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int i, j;
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Sample* Psrc;
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Contrib_List* Pclist = &m_Pclist_y[m_cur_dst_y];
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Sample* Ptmp = m_delay_x_resample ? m_Ptmp_buf : Pdst;
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assert(Ptmp);
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/* Process each contributor. */
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for (i = 0; i < Pclist->n; i++)
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{
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// locate the contributor's location in the scan buffer -- the contributor must always be found!
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for (j = 0; j < MAX_SCAN_BUF_SIZE; j++)
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if (m_Pscan_buf->scan_buf_y[j] == Pclist->p[i].pixel)
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break;
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assert(j < MAX_SCAN_BUF_SIZE);
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Psrc = m_Pscan_buf->scan_buf_l[j];
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if (!i)
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scale_y_mov(Ptmp, Psrc, Pclist->p[i].weight, m_intermediate_x);
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else
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scale_y_add(Ptmp, Psrc, Pclist->p[i].weight, m_intermediate_x);
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/* If this source line doesn't contribute to any
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* more destination lines then mark the scanline buffer slot
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* which holds this source line as free.
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* (The max. number of slots used depends on the Y
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* axis sampling factor and the scaled filter width.)
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*/
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if (--m_Psrc_y_count[resampler_range_check(Pclist->p[i].pixel, m_resample_src_y)] == 0)
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{
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m_Psrc_y_flag[resampler_range_check(Pclist->p[i].pixel, m_resample_src_y)] = false;
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m_Pscan_buf->scan_buf_y[j] = -1;
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}
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}
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/* Now generate the destination line */
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if (m_delay_x_resample) // Was X resampling delayed until after Y resampling?
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{
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assert(Pdst != Ptmp);
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resample_x(Pdst, Ptmp);
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}
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else
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{
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assert(Pdst == Ptmp);
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}
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if (m_lo < m_hi)
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clamp(Pdst, m_resample_dst_x);
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}
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bool Resampler::put_line(const Sample * Psrc)
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{
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int i;
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if (m_cur_src_y >= m_resample_src_y)
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return false;
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/* Does this source line contribute
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* to any destination line? if not,
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* exit now.
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*/
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if (!m_Psrc_y_count[resampler_range_check(m_cur_src_y, m_resample_src_y)])
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{
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m_cur_src_y++;
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return true;
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}
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/* Find an empty slot in the scanline buffer. (FIXME: Perf. is terrible here with extreme scaling ratios.) */
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for (i = 0; i < MAX_SCAN_BUF_SIZE; i++)
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if (m_Pscan_buf->scan_buf_y[i] == -1)
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break;
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/* If the buffer is full, exit with an error. */
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if (i == MAX_SCAN_BUF_SIZE)
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{
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m_status = STATUS_SCAN_BUFFER_FULL;
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return false;
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}
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m_Psrc_y_flag[resampler_range_check(m_cur_src_y, m_resample_src_y)] = true;
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m_Pscan_buf->scan_buf_y[i] = m_cur_src_y;
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/* Does this slot have any memory allocated to it? */
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if (!m_Pscan_buf->scan_buf_l[i])
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{
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if ((m_Pscan_buf->scan_buf_l[i] = (Sample*)malloc(m_intermediate_x * sizeof(Sample))) == NULL)
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{
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m_status = STATUS_OUT_OF_MEMORY;
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return false;
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}
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}
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// Resampling on the X axis first?
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if (m_delay_x_resample)
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{
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assert(m_intermediate_x == m_resample_src_x);
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// Y-X resampling order
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memcpy(m_Pscan_buf->scan_buf_l[i], Psrc, m_intermediate_x * sizeof(Sample));
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}
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else
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{
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assert(m_intermediate_x == m_resample_dst_x);
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// X-Y resampling order
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resample_x(m_Pscan_buf->scan_buf_l[i], Psrc);
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}
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m_cur_src_y++;
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return true;
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}
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const Resampler::Sample* Resampler::get_line()
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{
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int i;
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/* If all the destination lines have been
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* generated, then always return NULL.
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*/
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if (m_cur_dst_y == m_resample_dst_y)
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return NULL;
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/* Check to see if all the required
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* contributors are present, if not,
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* return NULL.
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*/
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for (i = 0; i < m_Pclist_y[m_cur_dst_y].n; i++)
|
|
if (!m_Psrc_y_flag[resampler_range_check(m_Pclist_y[m_cur_dst_y].p[i].pixel, m_resample_src_y)])
|
|
return NULL;
|
|
|
|
resample_y(m_Pdst_buf);
|
|
|
|
m_cur_dst_y++;
|
|
|
|
return m_Pdst_buf;
|
|
}
|
|
|
|
Resampler::~Resampler()
|
|
{
|
|
int i;
|
|
|
|
#if BASISU_RESAMPLER_DEBUG_OPS
|
|
printf("actual ops: %i\n", total_ops);
|
|
#endif
|
|
|
|
free(m_Pdst_buf);
|
|
m_Pdst_buf = NULL;
|
|
|
|
if (m_Ptmp_buf)
|
|
{
|
|
free(m_Ptmp_buf);
|
|
m_Ptmp_buf = NULL;
|
|
}
|
|
|
|
/* Don't deallocate a contibutor list
|
|
* if the user passed us one of their own.
|
|
*/
|
|
|
|
if ((m_Pclist_x) && (!m_clist_x_forced))
|
|
{
|
|
free(m_Pclist_x->p);
|
|
free(m_Pclist_x);
|
|
m_Pclist_x = NULL;
|
|
}
|
|
|
|
if ((m_Pclist_y) && (!m_clist_y_forced))
|
|
{
|
|
free(m_Pclist_y->p);
|
|
free(m_Pclist_y);
|
|
m_Pclist_y = NULL;
|
|
}
|
|
|
|
free(m_Psrc_y_count);
|
|
m_Psrc_y_count = NULL;
|
|
|
|
free(m_Psrc_y_flag);
|
|
m_Psrc_y_flag = NULL;
|
|
|
|
if (m_Pscan_buf)
|
|
{
|
|
for (i = 0; i < MAX_SCAN_BUF_SIZE; i++)
|
|
free(m_Pscan_buf->scan_buf_l[i]);
|
|
|
|
free(m_Pscan_buf);
|
|
m_Pscan_buf = NULL;
|
|
}
|
|
}
|
|
|
|
void Resampler::restart()
|
|
{
|
|
if (STATUS_OKAY != m_status)
|
|
return;
|
|
|
|
m_cur_src_y = m_cur_dst_y = 0;
|
|
|
|
int i, j;
|
|
for (i = 0; i < m_resample_src_y; i++)
|
|
{
|
|
m_Psrc_y_count[i] = 0;
|
|
m_Psrc_y_flag[i] = false;
|
|
}
|
|
|
|
for (i = 0; i < m_resample_dst_y; i++)
|
|
{
|
|
for (j = 0; j < m_Pclist_y[i].n; j++)
|
|
m_Psrc_y_count[resampler_range_check(m_Pclist_y[i].p[j].pixel, m_resample_src_y)]++;
|
|
}
|
|
|
|
for (i = 0; i < MAX_SCAN_BUF_SIZE; i++)
|
|
{
|
|
m_Pscan_buf->scan_buf_y[i] = -1;
|
|
|
|
free(m_Pscan_buf->scan_buf_l[i]);
|
|
m_Pscan_buf->scan_buf_l[i] = NULL;
|
|
}
|
|
}
|
|
|
|
Resampler::Resampler(int src_x, int src_y,
|
|
int dst_x, int dst_y,
|
|
Boundary_Op boundary_op,
|
|
Resample_Real sample_low, Resample_Real sample_high,
|
|
const char* Pfilter_name,
|
|
Contrib_List * Pclist_x,
|
|
Contrib_List * Pclist_y,
|
|
Resample_Real filter_x_scale,
|
|
Resample_Real filter_y_scale,
|
|
Resample_Real src_x_ofs,
|
|
Resample_Real src_y_ofs)
|
|
{
|
|
int i, j;
|
|
Resample_Real support, (*func)(Resample_Real);
|
|
|
|
assert(src_x > 0);
|
|
assert(src_y > 0);
|
|
assert(dst_x > 0);
|
|
assert(dst_y > 0);
|
|
|
|
#if BASISU_RESAMPLER_DEBUG_OPS
|
|
total_ops = 0;
|
|
#endif
|
|
|
|
m_lo = sample_low;
|
|
m_hi = sample_high;
|
|
|
|
m_delay_x_resample = false;
|
|
m_intermediate_x = 0;
|
|
m_Pdst_buf = NULL;
|
|
m_Ptmp_buf = NULL;
|
|
m_clist_x_forced = false;
|
|
m_Pclist_x = NULL;
|
|
m_clist_y_forced = false;
|
|
m_Pclist_y = NULL;
|
|
m_Psrc_y_count = NULL;
|
|
m_Psrc_y_flag = NULL;
|
|
m_Pscan_buf = NULL;
|
|
m_status = STATUS_OKAY;
|
|
|
|
m_resample_src_x = src_x;
|
|
m_resample_src_y = src_y;
|
|
m_resample_dst_x = dst_x;
|
|
m_resample_dst_y = dst_y;
|
|
|
|
m_boundary_op = boundary_op;
|
|
|
|
if ((m_Pdst_buf = (Sample*)malloc(m_resample_dst_x * sizeof(Sample))) == NULL)
|
|
{
|
|
m_status = STATUS_OUT_OF_MEMORY;
|
|
return;
|
|
}
|
|
|
|
// Find the specified filter.
|
|
|
|
if (Pfilter_name == NULL)
|
|
Pfilter_name = BASISU_RESAMPLER_DEFAULT_FILTER;
|
|
|
|
for (i = 0; i < g_num_resample_filters; i++)
|
|
if (strcmp(Pfilter_name, g_resample_filters[i].name) == 0)
|
|
break;
|
|
|
|
if (i == g_num_resample_filters)
|
|
{
|
|
m_status = STATUS_BAD_FILTER_NAME;
|
|
return;
|
|
}
|
|
|
|
func = g_resample_filters[i].func;
|
|
support = g_resample_filters[i].support;
|
|
|
|
/* Create contributor lists, unless the user supplied custom lists. */
|
|
|
|
if (!Pclist_x)
|
|
{
|
|
m_Pclist_x = make_clist(m_resample_src_x, m_resample_dst_x, m_boundary_op, func, support, filter_x_scale, src_x_ofs);
|
|
if (!m_Pclist_x)
|
|
{
|
|
m_status = STATUS_OUT_OF_MEMORY;
|
|
return;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
m_Pclist_x = Pclist_x;
|
|
m_clist_x_forced = true;
|
|
}
|
|
|
|
if (!Pclist_y)
|
|
{
|
|
m_Pclist_y = make_clist(m_resample_src_y, m_resample_dst_y, m_boundary_op, func, support, filter_y_scale, src_y_ofs);
|
|
if (!m_Pclist_y)
|
|
{
|
|
m_status = STATUS_OUT_OF_MEMORY;
|
|
return;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
m_Pclist_y = Pclist_y;
|
|
m_clist_y_forced = true;
|
|
}
|
|
|
|
if ((m_Psrc_y_count = (int*)calloc(m_resample_src_y, sizeof(int))) == NULL)
|
|
{
|
|
m_status = STATUS_OUT_OF_MEMORY;
|
|
return;
|
|
}
|
|
|
|
if ((m_Psrc_y_flag = (unsigned char*)calloc(m_resample_src_y, sizeof(unsigned char))) == NULL)
|
|
{
|
|
m_status = STATUS_OUT_OF_MEMORY;
|
|
return;
|
|
}
|
|
|
|
// Count how many times each source line contributes to a destination line.
|
|
|
|
for (i = 0; i < m_resample_dst_y; i++)
|
|
for (j = 0; j < m_Pclist_y[i].n; j++)
|
|
m_Psrc_y_count[resampler_range_check(m_Pclist_y[i].p[j].pixel, m_resample_src_y)]++;
|
|
|
|
if ((m_Pscan_buf = (Scan_Buf*)malloc(sizeof(Scan_Buf))) == NULL)
|
|
{
|
|
m_status = STATUS_OUT_OF_MEMORY;
|
|
return;
|
|
}
|
|
|
|
for (i = 0; i < MAX_SCAN_BUF_SIZE; i++)
|
|
{
|
|
m_Pscan_buf->scan_buf_y[i] = -1;
|
|
m_Pscan_buf->scan_buf_l[i] = NULL;
|
|
}
|
|
|
|
m_cur_src_y = m_cur_dst_y = 0;
|
|
{
|
|
// Determine which axis to resample first by comparing the number of multiplies required
|
|
// for each possibility.
|
|
int x_ops = count_ops(m_Pclist_x, m_resample_dst_x);
|
|
int y_ops = count_ops(m_Pclist_y, m_resample_dst_y);
|
|
|
|
// Hack 10/2000: Weight Y axis ops a little more than X axis ops.
|
|
// (Y axis ops use more cache resources.)
|
|
int xy_ops = x_ops * m_resample_src_y +
|
|
(4 * y_ops * m_resample_dst_x) / 3;
|
|
|
|
int yx_ops = (4 * y_ops * m_resample_src_x) / 3 +
|
|
x_ops * m_resample_dst_y;
|
|
|
|
#if BASISU_RESAMPLER_DEBUG_OPS
|
|
printf("src: %i %i\n", m_resample_src_x, m_resample_src_y);
|
|
printf("dst: %i %i\n", m_resample_dst_x, m_resample_dst_y);
|
|
printf("x_ops: %i\n", x_ops);
|
|
printf("y_ops: %i\n", y_ops);
|
|
printf("xy_ops: %i\n", xy_ops);
|
|
printf("yx_ops: %i\n", yx_ops);
|
|
#endif
|
|
|
|
// Now check which resample order is better. In case of a tie, choose the order
|
|
// which buffers the least amount of data.
|
|
if ((xy_ops > yx_ops) ||
|
|
((xy_ops == yx_ops) && (m_resample_src_x < m_resample_dst_x)))
|
|
{
|
|
m_delay_x_resample = true;
|
|
m_intermediate_x = m_resample_src_x;
|
|
}
|
|
else
|
|
{
|
|
m_delay_x_resample = false;
|
|
m_intermediate_x = m_resample_dst_x;
|
|
}
|
|
#if BASISU_RESAMPLER_DEBUG_OPS
|
|
printf("delaying: %i\n", m_delay_x_resample);
|
|
#endif
|
|
}
|
|
|
|
if (m_delay_x_resample)
|
|
{
|
|
if ((m_Ptmp_buf = (Sample*)malloc(m_intermediate_x * sizeof(Sample))) == NULL)
|
|
{
|
|
m_status = STATUS_OUT_OF_MEMORY;
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
void Resampler::get_clists(Contrib_List * *ptr_clist_x, Contrib_List * *ptr_clist_y)
|
|
{
|
|
if (ptr_clist_x)
|
|
* ptr_clist_x = m_Pclist_x;
|
|
|
|
if (ptr_clist_y)
|
|
* ptr_clist_y = m_Pclist_y;
|
|
}
|
|
|
|
int Resampler::get_filter_num()
|
|
{
|
|
return g_num_resample_filters;
|
|
}
|
|
|
|
const char* Resampler::get_filter_name(int filter_num)
|
|
{
|
|
if ((filter_num < 0) || (filter_num >= g_num_resample_filters))
|
|
return NULL;
|
|
else
|
|
return g_resample_filters[filter_num].name;
|
|
}
|
|
|
|
} // namespace basisu
|