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author | Vitor Sessak <vitor1001@gmail.com> | 2010-03-21 11:35:05 +0000 |
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committer | Vitor Sessak <vitor1001@gmail.com> | 2010-03-21 11:35:05 +0000 |
commit | 8305c76b53d8af602fd5172a5e0ab95cd8ded566 (patch) | |
tree | ed6f3533d6cd1e75f703825bc4c4d5fbd856f755 /libavcodec | |
parent | e30ab38e94252398e4390e12e1a883d24cc5afa5 (diff) | |
download | ffmpeg-8305c76b53d8af602fd5172a5e0ab95cd8ded566.tar.gz |
Split DCT-II and DCT-III in different functions, they do not share any code.
Originally committed as revision 22618 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavcodec')
-rw-r--r-- | libavcodec/dct.c | 16 |
1 files changed, 11 insertions, 5 deletions
diff --git a/libavcodec/dct.c b/libavcodec/dct.c index 7cc383379b..c7f5f7e180 100644 --- a/libavcodec/dct.c +++ b/libavcodec/dct.c @@ -37,12 +37,11 @@ /* cos((M_PI * x / (2*n)) */ #define COS(s,n,x) (s->costab[x]) -static void ff_dct_calc_c(DCTContext *ctx, FFTSample *data) +static void ff_dct_calc_III_c(DCTContext *ctx, FFTSample *data) { int n = 1 << ctx->nbits; int i; - if (ctx->inverse) { float next = data[n - 1]; float inv_n = 1.0f / n; @@ -69,7 +68,12 @@ static void ff_dct_calc_c(DCTContext *ctx, FFTSample *data) data[i ] = tmp1 + csc; data[n - i - 1] = tmp1 - csc; } - } else { +} + +static void ff_dct_calc_II_c(DCTContext *ctx, FFTSample *data) +{ + int n = 1 << ctx->nbits; + int i; float next; for (i=0; i < n/2; i++) { float tmp1 = data[i ]; @@ -100,7 +104,6 @@ static void ff_dct_calc_c(DCTContext *ctx, FFTSample *data) next += s * inr - c * ini; } - } } void ff_dct_calc(DCTContext *s, FFTSample *data) @@ -130,7 +133,10 @@ av_cold int ff_dct_init(DCTContext *s, int nbits, int inverse) for (i = 0; i < n/2; i++) s->csc2[i] = 0.5 / sin((M_PI / (2*n) * (2*i + 1))); - s->dct_calc = ff_dct_calc_c; + if(inverse) { + s->dct_calc = ff_dct_calc_III_c; + } else + s->dct_calc = ff_dct_calc_II_c; return 0; } |