x86: af_volume: add SSE2-optimized s16 volume scaling

1 files changed, 39 insertions, 0 deletions

diff --git a/libavfilter/x86/af_volume_init.c b/libavfilter/x86/af_volume_init.c
new file mode 100644
index 0000000..00103df
--- /dev/null
+++ b/libavfilter/x86/af_volume_init.c
@@ -0,0 +1,39 @@
+/*
+ * 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/samplefmt.h"
+#include "libavutil/x86/cpu.h"
+#include "libavfilter/af_volume.h"
+
+void ff_scale_samples_s16_sse2(uint8_t *dst, const uint8_t *src, int len,
+                               int volume);
+
+void ff_volume_init_x86(VolumeContext *vol)
+{
+    int mm_flags = av_get_cpu_flags();
+    enum AVSampleFormat sample_fmt = av_get_packed_sample_fmt(vol->sample_fmt);
+
+    if (sample_fmt == AV_SAMPLE_FMT_S16) {
+        if (EXTERNAL_SSE2(mm_flags) && vol->volume_i < 32768) {
+            vol->scale_samples = ff_scale_samples_s16_sse2;
+            vol->samples_align = 8;
+        }
+    }
+}