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authorJustin Ruggles <justin.ruggles@gmail.com>2011-01-30 15:06:46 +0000
committerMichael Niedermayer <michaelni@gmx.at>2011-02-04 03:08:09 +0100
commitfe2ff6d24745f0739bfde9061092c1268557310b (patch)
tree9cbcf8b2472dd7612dd84c8b6b237d9d02b4daf9 /libavcodec/arm/fmtconvert_vfp.S
parenta35d782d28ef0497f2b65eb300c2e6a6028fc165 (diff)
downloadffmpeg-fe2ff6d24745f0739bfde9061092c1268557310b.tar.gz
Separate format conversion DSP functions from DSPContext.
This will be beneficial for use with the audio conversion API without requiring it to depend on all of dsputil. Signed-off-by: Mans Rullgard <mans@mansr.com> (cherry picked from commit c73d99e672329c8f2df290736ffc474c360ac4ae)
Diffstat (limited to 'libavcodec/arm/fmtconvert_vfp.S')
-rw-r--r--libavcodec/arm/fmtconvert_vfp.S77
1 files changed, 77 insertions, 0 deletions
diff --git a/libavcodec/arm/fmtconvert_vfp.S b/libavcodec/arm/fmtconvert_vfp.S
new file mode 100644
index 0000000000..1d19e7758b
--- /dev/null
+++ b/libavcodec/arm/fmtconvert_vfp.S
@@ -0,0 +1,77 @@
+/*
+ * Copyright (c) 2008 Siarhei Siamashka <ssvb@users.sourceforge.net>
+ *
+ * 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
+ */
+
+#include "config.h"
+#include "asm.S"
+
+ .syntax unified
+
+/**
+ * ARM VFP optimized float to int16 conversion.
+ * Assume that len is a positive number and is multiple of 8, destination
+ * buffer is at least 4 bytes aligned (8 bytes alignment is better for
+ * performance), little endian byte sex
+ */
+@ void ff_float_to_int16_vfp(int16_t *dst, const float *src, int len)
+function ff_float_to_int16_vfp, export=1
+ push {r4-r8,lr}
+ vpush {d8-d11}
+ vldmia r1!, {s16-s23}
+ vcvt.s32.f32 s0, s16
+ vcvt.s32.f32 s1, s17
+ vcvt.s32.f32 s2, s18
+ vcvt.s32.f32 s3, s19
+ vcvt.s32.f32 s4, s20
+ vcvt.s32.f32 s5, s21
+ vcvt.s32.f32 s6, s22
+ vcvt.s32.f32 s7, s23
+1:
+ subs r2, r2, #8
+ vmov r3, r4, s0, s1
+ vmov r5, r6, s2, s3
+ vmov r7, r8, s4, s5
+ vmov ip, lr, s6, s7
+ vldmiagt r1!, {s16-s23}
+ ssat r4, #16, r4
+ ssat r3, #16, r3
+ ssat r6, #16, r6
+ ssat r5, #16, r5
+ pkhbt r3, r3, r4, lsl #16
+ pkhbt r4, r5, r6, lsl #16
+ vcvtgt.s32.f32 s0, s16
+ vcvtgt.s32.f32 s1, s17
+ vcvtgt.s32.f32 s2, s18
+ vcvtgt.s32.f32 s3, s19
+ vcvtgt.s32.f32 s4, s20
+ vcvtgt.s32.f32 s5, s21
+ vcvtgt.s32.f32 s6, s22
+ vcvtgt.s32.f32 s7, s23
+ ssat r8, #16, r8
+ ssat r7, #16, r7
+ ssat lr, #16, lr
+ ssat ip, #16, ip
+ pkhbt r5, r7, r8, lsl #16
+ pkhbt r6, ip, lr, lsl #16
+ stmia r0!, {r3-r6}
+ bgt 1b
+
+ vpop {d8-d11}
+ pop {r4-r8,pc}
+endfunc