lavc: add Intel libmfx-based MPEG2 decoder.

[ffmpeg] / libavcodec / rdft.c

diff --git a/libavcodec/rdft.c b/libavcodec/rdft.c
index 29fedc8767121540bb4e601ab21bf303b5d70468..19652537f8590821d5913c1375a00ca8bda7954c 100644 (file)
--- a/libavcodec/rdft.c
+++ b/libavcodec/rdft.c
@@ -2,29 +2,29 @@
  * (I)RDFT transforms
  * Copyright (c) 2009 Alex Converse <alex dot converse at gmail dot com>
  *
- * This file is part of FFmpeg.
+ * This file is part of Libav.
  *
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *
- * FFmpeg is distributed in the hope that it will be useful,
+ * Libav is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
- * License along with FFmpeg; if not, write to the Free Software
+ * License along with Libav; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #include <stdlib.h>
 #include <math.h>
 #include "libavutil/mathematics.h"
-#include "fft.h"
+#include "rdft.h"
 
 /**
- * @file libavcodec/rdft.c
+ * @file
  * (Inverse) Real Discrete Fourier Transforms.
  */
 
@@ -44,7 +44,7 @@ SINTABLE(16384);
 SINTABLE(32768);
 SINTABLE(65536);
 #endif
-SINTABLE_CONST FFTSample * const ff_sin_tabs[] = {
+static SINTABLE_CONST FFTSample * const ff_sin_tabs[] = {
     NULL, NULL, NULL, NULL,
     ff_sin_16, ff_sin_32, ff_sin_64, ff_sin_128, ff_sin_256, ff_sin_512, ff_sin_1024,
     ff_sin_2048, ff_sin_4096, ff_sin_8192, ff_sin_16384, ff_sin_32768, ff_sin_65536,
@@ -54,7 +54,7 @@ SINTABLE_CONST FFTSample * const ff_sin_tabs[] = {
  * the two real FFTs into one complex FFT. Unmangle the results.
  * ref: http://www.engineeringproductivitytools.com/stuff/T0001/PT10.HTM
  */
-static void ff_rdft_calc_c(RDFTContext* s, FFTSample* data)
+static void rdft_calc_c(RDFTContext *s, FFTSample *data)
 {
     int i, i1, i2;
     FFTComplex ev, od;
@@ -65,8 +65,8 @@ static void ff_rdft_calc_c(RDFTContext* s, FFTSample* data)
     const FFTSample *tsin = s->tsin;
 
     if (!s->inverse) {
-        ff_fft_permute(&s->fft, (FFTComplex*)data);
-        ff_fft_calc(&s->fft, (FFTComplex*)data);
+        s->fft.fft_permute(&s->fft, (FFTComplex*)data);
+        s->fft.fft_calc(&s->fft, (FFTComplex*)data);
     }
     /* i=0 is a special case because of packing, the DC term is real, so we
        are going to throw the N/2 term (also real) in with it. */
@@ -91,16 +91,14 @@ static void ff_rdft_calc_c(RDFTContext* s, FFTSample* data)
     if (s->inverse) {
         data[0] *= k1;
         data[1] *= k1;
-        ff_fft_permute(&s->fft, (FFTComplex*)data);
-        ff_fft_calc(&s->fft, (FFTComplex*)data);
+        s->fft.fft_permute(&s->fft, (FFTComplex*)data);
+        s->fft.fft_calc(&s->fft, (FFTComplex*)data);
     }
 }
 
 av_cold int ff_rdft_init(RDFTContext *s, int nbits, enum RDFTransformType trans)
 {
     int n = 1 << nbits;
-    int i;
-    const double theta = (trans == DFT_R2C || trans == DFT_C2R ? -1 : 1)*2*M_PI/n;
 
     s->nbits           = nbits;
     s->inverse         = trans == IDFT_C2R || trans == DFT_C2R;
@@ -116,11 +114,17 @@ av_cold int ff_rdft_init(RDFTContext *s, int nbits, enum RDFTransformType trans)
     s->tcos = ff_cos_tabs[nbits];
     s->tsin = ff_sin_tabs[nbits]+(trans == DFT_R2C || trans == DFT_C2R)*(n>>2);
 #if !CONFIG_HARDCODED_TABLES
-    for (i = 0; i < (n>>2); i++) {
-        s->tsin[i] = sin(i*theta);
+    {
+        int i;
+        const double theta = (trans == DFT_R2C || trans == DFT_C2R ? -1 : 1) * 2 * M_PI / n;
+        for (i = 0; i < (n >> 2); i++)
+            s->tsin[i] = sin(i * theta);
     }
 #endif
-    s->rdft_calc   = ff_rdft_calc_c;
+    s->rdft_calc   = rdft_calc_c;
+
+    if (ARCH_ARM) ff_rdft_init_arm(s);
+
     return 0;
 }