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Call rdft by function pointer 

Call the RDFT by a function pointer like other FFT related transforms.
This makes instruction set optimized versions possible.

Based on patch by Alex Converse.

Originally committed as revision 22609 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Måns Rullgård 2010-03-20 21:27:03 +00:00
parent b297129bdb
commit 2881c83127
2 changed files with 9 additions and 6 deletions
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7
libavcodec/fft.h
View File

@ -196,6 +196,7 @@ struct RDFTContext {
const FFTSample *tcos;
SINTABLE_CONST FFTSample *tsin;
FFTContext fft;
void (*rdft_calc)(struct RDFTContext *s, FFTSample *z);
};
/**
@ -204,9 +205,13 @@ struct RDFTContext {
* @param trans the type of transform
*/
int ff_rdft_init(RDFTContext *s, int nbits, enum RDFTransformType trans);
void ff_rdft_calc(RDFTContext *s, FFTSample *data);
void ff_rdft_end(RDFTContext *s);
static av_always_inline void ff_rdft_calc(RDFTContext *s, FFTSample *data)
{
s->rdft_calc(s, data);
}
/* Discrete Cosine Transform */
struct DCTContext {

8
libavcodec/rdft.c
View File

@ -50,6 +50,8 @@ SINTABLE_CONST FFTSample * const ff_sin_tabs[] = {
ff_sin_2048, ff_sin_4096, ff_sin_8192, ff_sin_16384, ff_sin_32768, ff_sin_65536,
};
static void ff_rdft_calc_c(RDFTContext* s, FFTSample* data);
av_cold int ff_rdft_init(RDFTContext *s, int nbits, enum RDFTransformType trans)
{
int n = 1 << nbits;
@ -74,6 +76,7 @@ av_cold int ff_rdft_init(RDFTContext *s, int nbits, enum RDFTransformType trans)
s->tsin[i] = sin(i*theta);
}
#endif
s->rdft_calc = ff_rdft_calc_c;
return 0;
}
@ -123,11 +126,6 @@ static void ff_rdft_calc_c(RDFTContext* s, FFTSample* data)
}
}
void ff_rdft_calc(RDFTContext *s, FFTSample *data)
{
ff_rdft_calc_c(s, data);
}
av_cold void ff_rdft_end(RDFTContext *s)
{
ff_fft_end(&s->fft);