From patchwork Fri Jul 19 10:26:52 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: [03/10] fmtconvert: Add a new method, int32_to_float_fmul_array8 X-Patchwork-Submitter: =?utf-8?q?Martin_Storsj=C3=B6?= X-Patchwork-Id: 40449 Message-Id: <1374229619-10092-3-git-send-email-martin@martin.st> To: libav-devel@libav.org Date: Fri, 19 Jul 2013 13:26:52 +0300 From: =?UTF-8?q?Martin=20Storsj=C3=B6?= List-Id: libav development From: Ben Avison 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). --- libavcodec/fmtconvert.c | 10 ++++++++++ libavcodec/fmtconvert.h | 16 ++++++++++++++++ 2 files changed, 26 insertions(+) diff --git a/libavcodec/fmtconvert.c b/libavcodec/fmtconvert.c index 54f7030..63f62c3 100644 --- a/libavcodec/fmtconvert.c +++ b/libavcodec/fmtconvert.c @@ -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; diff --git a/libavcodec/fmtconvert.h b/libavcodec/fmtconvert.h index a28af36..bd833ef 100644 --- a/libavcodec/fmtconvert.h +++ b/libavcodec/fmtconvert.h @@ -39,6 +39,22 @@ typedef struct FmtConvertContext { 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