[FFmpeg-devel] [PATCH] dsputil: add bswap16_buf()

[Michael Niedermayer]

On Sun, Jun 13, 2010 at 05:59:20PM +0100, Mans Rullgard wrote:
> ---
>  libavcodec/dsputil.c |    7 +++++++
>  libavcodec/dsputil.h |    1 +
>  2 files changed, 8 insertions(+), 0 deletions(-)
> 
> diff --git a/libavcodec/dsputil.c b/libavcodec/dsputil.c
> index 0701324..1ecd73f 100644
> --- a/libavcodec/dsputil.c
> +++ b/libavcodec/dsputil.c
> @@ -260,6 +260,12 @@ static void bswap_buf(uint32_t *dst, const uint32_t *src, int w){
>      }
>  }
>  
> +static void bswap16_buf(uint16_t *dst, const uint16_t *src, int len)
> +{
> +    while (len--)
> +        *dst++ = bswap_16(*src++);
> +}

on 64bit arch this is likely faster:

uint64_t u= ((uint64_t*)src)[i];
((uint64_t*)dst)[i]= ((u>>8)&0x...) + ((u<<8)&0x...)



> +
>  static int sse4_c(void *v, uint8_t * pix1, uint8_t * pix2, int line_size, int h)
>  {
>      int s, i;
> @@ -4455,6 +4461,7 @@ av_cold void dsputil_init(DSPContext* c, AVCodecContext *avctx)
>      c->add_hfyu_left_prediction  = add_hfyu_left_prediction_c;
>      c->add_hfyu_left_prediction_bgr32 = add_hfyu_left_prediction_bgr32_c;
>      c->bswap_buf= bswap_buf;
> +    c->bswap16_buf = bswap16_buf;
>  #if CONFIG_PNG_DECODER
>      c->add_png_paeth_prediction= ff_add_png_paeth_prediction;
>  #endif
> diff --git a/libavcodec/dsputil.h b/libavcodec/dsputil.h
> index fd2d07f..f3926cd 100644
> --- a/libavcodec/dsputil.h
> +++ b/libavcodec/dsputil.h
> @@ -365,6 +365,7 @@ typedef struct DSPContext {
>      /* this might write to dst[w] */
>      void (*add_png_paeth_prediction)(uint8_t *dst, uint8_t *src, uint8_t *top, int w, int bpp);
>      void (*bswap_buf)(uint32_t *dst, const uint32_t *src, int w);

> +    void (*bswap16_buf)(uint16_t *dst, const uint16_t *src, int len);

how much alignment can we assume to have for dst/src? and len?

[...]
-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

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