libavresample: NEON optimized FIR audio resampling

modelled after aarch64 code

on Cortex-A8, s16 and s32 code is about 2x faster,
float code about 7x faster

Signed-off-by: Peter Meerwald <pmeerw@pmeerw.net>
Signed-off-by: Martin Storsjö <martin@martin.st>

1 files changed, 74 insertions, 0 deletions

diff --git a/libavresample/arm/resample_init.c b/libavresample/arm/resample_init.c
new file mode 100644
index 0000000000..540177ed0b
--- /dev/null
+++ b/libavresample/arm/resample_init.c
@@ -0,0 +1,74 @@
+/*
+ * Copyright (c) 2014 Peter Meerwald <pmeerw@pmeerw.net>
+ *
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ *
+ * Libav 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 Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "config.h"
+
+#include "libavutil/cpu.h"
+#include "libavutil/arm/cpu.h"
+#include "libavutil/internal.h"
+#include "libavutil/samplefmt.h"
+
+#include "libavresample/resample.h"
+
+#include "asm-offsets.h"
+
+AV_CHECK_OFFSET(struct ResampleContext, filter_bank,   FILTER_BANK);
+AV_CHECK_OFFSET(struct ResampleContext, filter_length, FILTER_LENGTH);
+AV_CHECK_OFFSET(struct ResampleContext, src_incr,      SRC_INCR);
+AV_CHECK_OFFSET(struct ResampleContext, phase_shift,   PHASE_SHIFT);
+AV_CHECK_OFFSET(struct ResampleContext, phase_mask,    PHASE_MASK);
+
+void ff_resample_one_flt_neon(struct ResampleContext *c, void *dst0,
+                              int dst_index, const void *src0,
+                              unsigned int index, int frac);
+void ff_resample_one_s16_neon(struct ResampleContext *c, void *dst0,
+                              int dst_index, const void *src0,
+                              unsigned int index, int frac);
+void ff_resample_one_s32_neon(struct ResampleContext *c, void *dst0,
+                              int dst_index, const void *src0,
+                              unsigned int index, int frac);
+
+void ff_resample_linear_flt_neon(struct ResampleContext *c, void *dst0,
+                                 int dst_index, const void *src0,
+                                 unsigned int index, int frac);
+
+av_cold void ff_audio_resample_init_arm(ResampleContext *c,
+                                        enum AVSampleFormat sample_fmt)
+{
+    int cpu_flags = av_get_cpu_flags();
+    if (have_neon(cpu_flags)) {
+        switch (sample_fmt) {
+        case AV_SAMPLE_FMT_FLTP:
+            if (c->linear)
+                c->resample_one = ff_resample_linear_flt_neon;
+            else
+                c->resample_one = ff_resample_one_flt_neon;
+            break;
+        case AV_SAMPLE_FMT_S16P:
+            if (!c->linear)
+                c->resample_one = ff_resample_one_s16_neon;
+            break;
+        case AV_SAMPLE_FMT_S32P:
+            if (!c->linear)
+                c->resample_one = ff_resample_one_s32_neon;
+            break;
+        }
+    }
+}