1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
|
From 7901e7216cf6406a2ea430c71af94ebee72f262b Mon Sep 17 00:00:00 2001
From: Ben Avison <bavison@riscosopen.org>
Date: Mon, 15 Jul 2013 18:28:11 +0100
Subject: [PATCH 41/49] [ffmpeg] - backport - fmtconvert: Add a new method,
int32_to_float_fmul_array8
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
This is similar to int32_to_float_fmul_scalar, but
loads a new scalar multiplier every 8 input samples.
This enables the use of much larger input arrays, which
is important for pipelining on some CPUs (such as
ARMv6).
Signed-off-by: Martin Storsjö <martin@martin.st>
---
lib/ffmpeg/libavcodec/fmtconvert.c | 10 ++++++++++
lib/ffmpeg/libavcodec/fmtconvert.h | 16 ++++++++++++++++
2 files changed, 26 insertions(+)
diff --git a/lib/ffmpeg/libavcodec/fmtconvert.c b/lib/ffmpeg/libavcodec/fmtconvert.c
index 79e9645..1c45d35 100644
--- a/lib/ffmpeg/libavcodec/fmtconvert.c
+++ b/lib/ffmpeg/libavcodec/fmtconvert.c
@@ -30,6 +30,15 @@ static void int32_to_float_fmul_scalar_c(float *dst, const int *src, float mul,
dst[i] = src[i] * mul;
}
+static void int32_to_float_fmul_array8_c(FmtConvertContext *c, float *dst,
+ const int32_t *src, const float *mul,
+ int len)
+{
+ int i;
+ for (i = 0; i < len; i += 8)
+ c->int32_to_float_fmul_scalar(&dst[i], &src[i], *mul++, 8);
+}
+
static av_always_inline int float_to_int16_one(const float *src){
return av_clip_int16(lrintf(*src));
}
@@ -79,6 +88,7 @@ void ff_float_interleave_c(float *dst, const float **src, unsigned int len,
av_cold void ff_fmt_convert_init(FmtConvertContext *c, AVCodecContext *avctx)
{
c->int32_to_float_fmul_scalar = int32_to_float_fmul_scalar_c;
+ c->int32_to_float_fmul_array8 = int32_to_float_fmul_array8_c;
c->float_to_int16 = float_to_int16_c;
c->float_to_int16_interleave = float_to_int16_interleave_c;
c->float_interleave = ff_float_interleave_c;
diff --git a/lib/ffmpeg/libavcodec/fmtconvert.h b/lib/ffmpeg/libavcodec/fmtconvert.h
index 3fb9f4e..02468dc 100644
--- a/lib/ffmpeg/libavcodec/fmtconvert.h
+++ b/lib/ffmpeg/libavcodec/fmtconvert.h
@@ -38,6 +38,22 @@ typedef struct FmtConvertContext {
void (*int32_to_float_fmul_scalar)(float *dst, const int *src, float mul, int len);
/**
+ * Convert an array of int32_t to float and multiply by a float value from another array,
+ * stepping along the float array once for each 8 integers.
+ * @param c pointer to FmtConvertContext.
+ * @param dst destination array of float.
+ * constraints: 16-byte aligned
+ * @param src source array of int32_t.
+ * constraints: 16-byte aligned
+ * @param mul source array of float multipliers.
+ * @param len number of elements to convert.
+ * constraints: multiple of 8
+ */
+ void (*int32_to_float_fmul_array8)(struct FmtConvertContext *c,
+ float *dst, const int32_t *src,
+ const float *mul, int len);
+
+ /**
* Convert an array of float to an array of int16_t.
*
* Convert floats from in the range [-32768.0,32767.0] to ints
--
1.7.9.5
|
