From 6430ce0f727f93600742cc3da5750b102b568857 Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Thu, 24 Aug 2006 08:40:09 +0000 Subject: [PATCH] optimize reorder_block() though this function seems to be executed too rarely for this to make much difference Originally committed as revision 6068 to svn://svn.ffmpeg.org/ffmpeg/trunk --- libavcodec/mpegaudiodec.c | 17 +++++++++-------- 1 file changed, 9 insertions(+), 8 deletions(-) diff --git a/libavcodec/mpegaudiodec.c b/libavcodec/mpegaudiodec.c index 04d65a5..3b11cfe 100644 --- a/libavcodec/mpegaudiodec.c +++ b/libavcodec/mpegaudiodec.c @@ -1776,7 +1776,7 @@ static int huffman_decode(MPADecodeContext *s, GranuleDef *g, complicated */ static void reorder_block(MPADecodeContext *s, GranuleDef *g) { - int i, j, k, len; + int i, j, len; int32_t *ptr, *dst, *ptr1; int32_t tmp[576]; @@ -1796,14 +1796,15 @@ static void reorder_block(MPADecodeContext *s, GranuleDef *g) for(i=g->short_start;i<13;i++) { len = band_size_short[s->sample_rate_index][i]; ptr1 = ptr; - for(k=0;k<3;k++) { - dst = tmp + k; - for(j=len;j>0;j--) { - *dst = *ptr++; - dst += 3; - } + dst = tmp; + for(j=len;j>0;j--) { + *dst++ = ptr[0*len]; + *dst++ = ptr[1*len]; + *dst++ = ptr[2*len]; + ptr++; } - memcpy(ptr1, tmp, len * 3 * sizeof(int32_t)); + ptr+=2*len; + memcpy(ptr1, tmp, len * 3 * sizeof(*ptr1)); } } -- 2.7.4