From 1fb8f6a44f06e48386450fe0363aefc02583d24a Mon Sep 17 00:00:00 2001
From: Justin Ruggles <justin.ruggles@gmail.com>
Date: Wed, 31 Oct 2012 15:40:12 -0400
Subject: x86: lavr: add SSE2 quantize() for dithering

---
 libavresample/x86/Makefile      |  2 ++
 libavresample/x86/dither.asm    | 53 +++++++++++++++++++++++++++++++++++++++++
 libavresample/x86/dither_init.c | 39 ++++++++++++++++++++++++++++++
 3 files changed, 94 insertions(+)
 create mode 100644 libavresample/x86/dither.asm
 create mode 100644 libavresample/x86/dither_init.c

(limited to 'libavresample/x86')

diff --git a/libavresample/x86/Makefile b/libavresample/x86/Makefile
index 65bed899ba..2e8786fb90 100644
--- a/libavresample/x86/Makefile
+++ b/libavresample/x86/Makefile
@@ -1,5 +1,7 @@
 OBJS      += x86/audio_convert_init.o                                   \
              x86/audio_mix_init.o                                       \
+             x86/dither_init.o                                          \
 
 YASM-OBJS += x86/audio_convert.o                                        \
              x86/audio_mix.o                                            \
+             x86/dither.o                                               \
diff --git a/libavresample/x86/dither.asm b/libavresample/x86/dither.asm
new file mode 100644
index 0000000000..34e7924291
--- /dev/null
+++ b/libavresample/x86/dither.asm
@@ -0,0 +1,53 @@
+;******************************************************************************
+;* x86 optimized dithering format conversion
+;* Copyright (c) 2012 Justin Ruggles <justin.ruggles@gmail.com>
+;*
+;* 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 "libavutil/x86/x86util.asm"
+
+SECTION_RODATA 32
+
+pf_s16_scale: times 4 dd 32753.0
+
+SECTION_TEXT
+
+;------------------------------------------------------------------------------
+; void ff_quantize(int16_t *dst, float *src, float *dither, int len);
+;------------------------------------------------------------------------------
+
+INIT_XMM sse2
+cglobal quantize, 4,4,3, dst, src, dither, len
+    lea         lenq, [2*lend]
+    add         dstq, lenq
+    lea         srcq, [srcq+2*lenq]
+    lea      ditherq, [ditherq+2*lenq]
+    neg         lenq
+    mova          m2, [pf_s16_scale]
+.loop:
+    mulps         m0, m2, [srcq+2*lenq]
+    mulps         m1, m2, [srcq+2*lenq+mmsize]
+    addps         m0, [ditherq+2*lenq]
+    addps         m1, [ditherq+2*lenq+mmsize]
+    cvtps2dq      m0, m0
+    cvtps2dq      m1, m1
+    packssdw      m0, m1
+    mova     [dstq+lenq], m0
+    add         lenq, mmsize
+    jl .loop
+    REP_RET
diff --git a/libavresample/x86/dither_init.c b/libavresample/x86/dither_init.c
new file mode 100644
index 0000000000..1e20c1194a
--- /dev/null
+++ b/libavresample/x86/dither_init.c
@@ -0,0 +1,39 @@
+/*
+ * Copyright (c) 2012 Justin Ruggles <justin.ruggles@gmail.com>
+ *
+ * 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/x86/cpu.h"
+#include "libavresample/dither.h"
+
+extern void ff_quantize_sse2(int16_t *dst, const float *src, float *dither,
+                             int len);
+
+av_cold void ff_dither_init_x86(DitherDSPContext *ddsp,
+                                enum AVResampleDitherMethod method)
+{
+    int mm_flags = av_get_cpu_flags();
+
+    if (EXTERNAL_SSE2(mm_flags)) {
+        ddsp->quantize      = ff_quantize_sse2;
+        ddsp->ptr_align     = 16;
+        ddsp->samples_align = 8;
+    }
+}
-- 
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