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-rw-r--r--libavresample/resample_template.c102
1 files changed, 102 insertions, 0 deletions
diff --git a/libavresample/resample_template.c b/libavresample/resample_template.c
new file mode 100644
index 0000000000..06da90fe9f
--- /dev/null
+++ b/libavresample/resample_template.c
@@ -0,0 +1,102 @@
+/*
+ * Copyright (c) 2004 Michael Niedermayer <michaelni@gmx.at>
+ *
+ * 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
+ */
+
+#if defined(CONFIG_RESAMPLE_DBL)
+#define SET_TYPE(func) func ## _dbl
+#define FELEM double
+#define FELEM2 double
+#define FELEML double
+#define OUT(d, v) d = v
+#define DBL_TO_FELEM(d, v) d = v
+#elif defined(CONFIG_RESAMPLE_FLT)
+#define SET_TYPE(func) func ## _flt
+#define FELEM float
+#define FELEM2 float
+#define FELEML float
+#define OUT(d, v) d = v
+#define DBL_TO_FELEM(d, v) d = v
+#elif defined(CONFIG_RESAMPLE_S32)
+#define SET_TYPE(func) func ## _s32
+#define FELEM int32_t
+#define FELEM2 int64_t
+#define FELEML int64_t
+#define OUT(d, v) d = av_clipl_int32((v + (1 << 29)) >> 30)
+#define DBL_TO_FELEM(d, v) d = av_clipl_int32(llrint(v * (1 << 30)));
+#else
+#define SET_TYPE(func) func ## _s16
+#define FELEM int16_t
+#define FELEM2 int32_t
+#define FELEML int64_t
+#define OUT(d, v) d = av_clip_int16((v + (1 << 14)) >> 15)
+#define DBL_TO_FELEM(d, v) d = av_clip_int16(lrint(v * (1 << 15)))
+#endif
+
+static void SET_TYPE(resample_one)(ResampleContext *c, int no_filter,
+ void *dst0, int dst_index, const void *src0,
+ int src_size, int index, int frac)
+{
+ FELEM *dst = dst0;
+ const FELEM *src = src0;
+
+ if (no_filter) {
+ dst[dst_index] = src[index];
+ } else {
+ int i;
+ int sample_index = index >> c->phase_shift;
+ FELEM2 val = 0;
+ FELEM *filter = ((FELEM *)c->filter_bank) +
+ c->filter_length * (index & c->phase_mask);
+
+ if (sample_index < 0) {
+ for (i = 0; i < c->filter_length; i++)
+ val += src[FFABS(sample_index + i) % src_size] *
+ (FELEM2)filter[i];
+ } else if (c->linear) {
+ FELEM2 v2 = 0;
+ for (i = 0; i < c->filter_length; i++) {
+ val += src[abs(sample_index + i)] * (FELEM2)filter[i];
+ v2 += src[abs(sample_index + i)] * (FELEM2)filter[i + c->filter_length];
+ }
+ val += (v2 - val) * (FELEML)frac / c->src_incr;
+ } else {
+ for (i = 0; i < c->filter_length; i++)
+ val += src[sample_index + i] * (FELEM2)filter[i];
+ }
+
+ OUT(dst[dst_index], val);
+ }
+}
+
+static void SET_TYPE(set_filter)(void *filter0, double *tab, int phase,
+ int tap_count)
+{
+ int i;
+ FELEM *filter = ((FELEM *)filter0) + phase * tap_count;
+ for (i = 0; i < tap_count; i++) {
+ DBL_TO_FELEM(filter[i], tab[i]);
+ }
+}
+
+#undef SET_TYPE
+#undef FELEM
+#undef FELEM2
+#undef FELEML
+#undef OUT
+#undef DBL_TO_FELEM