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fmtconvert: Add a new method, int32_to_float_fmul_array8

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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>
This commit is contained in:
Ben Avison 2013-07-15 18:28:11 +01:00 committed by Martin Storsjö
parent ce9ed10ac2
commit 31c6f6f65c
2 changed files with 26 additions and 0 deletions
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10
libavcodec/fmtconvert.c
View File

@ -32,6 +32,15 @@ static void int32_to_float_fmul_scalar_c(float *dst, const int32_t *src,
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));
}
@ -81,6 +90,7 @@ 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;

16
libavcodec/fmtconvert.h
View File

@ -38,6 +38,22 @@ typedef struct FmtConvertContext {
void (*int32_to_float_fmul_scalar)(float *dst, const int32_t *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.
*