libavcodec: Implementation of 32 bit fixed point FFT

Iterative implementation of 32 bit fixed point split-radix FFT.
Max FFT that can be calculated currently is 2^12.

Signed-off-by: Nedeljko Babic <nbabic@mips.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

19 files changed, 543 insertions, 36 deletions

diff --git a/doc/mips.txt b/doc/mips.txt
index 051b8196b2..8c6779f67d 100644
--- a/doc/mips.txt
+++ b/doc/mips.txt
@@ -47,6 +47,11 @@ Files that have MIPS copyright notice in them:
 * libavutil/mips/
       float_dsp_mips.c
       libm_mips.h
+* libavcodec/
+      fft_fixed_32.c
+      fft_init_table.c
+      fft_table.h
+      mdct_fixed_32.c
 * libavcodec/mips/
       aaccoder_mips.c
       aacpsy_mips.h
diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index 31477acccc..2a90bbe10d 100644
--- a/libavcodec/Makefile
+++ b/libavcodec/Makefile
@@ -44,6 +44,7 @@ OBJS-$(CONFIG_ENCODERS)                += faandct.o jfdctfst.o jfdctint.o
 OBJS-$(CONFIG_ERROR_RESILIENCE)        += error_resilience.o
 FFT-OBJS-$(CONFIG_HARDCODED_TABLES)    += cos_tables.o cos_fixed_tables.o
 OBJS-$(CONFIG_FFT)                     += avfft.o fft_fixed.o fft_float.o \
+                                          fft_fixed_32.o fft_init_table.o \
                                           $(FFT-OBJS-yes)
 OBJS-$(CONFIG_GOLOMB)                  += golomb.o
 OBJS-$(CONFIG_H264CHROMA)              += h264chroma.o
@@ -55,7 +56,7 @@ OBJS-$(CONFIG_HUFFMAN)                 += huffman.o
 OBJS-$(CONFIG_LIBXVID)                 += libxvid_rc.o
 OBJS-$(CONFIG_LPC)                     += lpc.o
 OBJS-$(CONFIG_LSP)                     += lsp.o
-OBJS-$(CONFIG_MDCT)                    += mdct_fixed.o mdct_float.o
+OBJS-$(CONFIG_MDCT)                    += mdct_fixed.o mdct_float.o mdct_fixed_32.o
 OBJS-$(CONFIG_MPEGAUDIO)               += mpegaudio.o mpegaudiodata.o   \
                                           mpegaudiodecheader.o
 OBJS-$(CONFIG_MPEGAUDIODSP)            += mpegaudiodsp.o                \
@@ -811,6 +812,7 @@ TESTPROGS = cabac                                                       \
             dct                                                         \
             fft                                                         \
             fft-fixed                                                   \
+            fft-fixed32                                                 \
             golomb                                                      \
             iirfilter                                                   \
             imgconvert                                                  \
diff --git a/libavcodec/fft-fixed32-test.c b/libavcodec/fft-fixed32-test.c
new file mode 100644
index 0000000000..89cd47c1da
--- /dev/null
+++ b/libavcodec/fft-fixed32-test.c
@@ -0,0 +1,21 @@
+/*
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg 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,
+ * 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
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#define CONFIG_FFT_FLOAT 0
+#define CONFIG_FFT_FIXED_32 1
+#include "fft-test.c"
diff --git a/libavcodec/fft-internal.h b/libavcodec/fft-internal.h
index d66731fb48..065eeccef1 100644
--- a/libavcodec/fft-internal.h
+++ b/libavcodec/fft-internal.h
@@ -36,12 +36,29 @@
 
 #else
 
+#define SCALE_FLOAT(a, bits) lrint((a) * (double)(1 << (bits)))
+
+#if CONFIG_FFT_FIXED_32
+
+#define CMUL(dre, dim, are, aim, bre, bim) do {             \
+        int64_t accu;                                     \
+        (accu)  = (int64_t)(bre) * (are);                 \
+        (accu) -= (int64_t)(bim) * (aim);                 \
+        (dre)   = (int)(((accu) + 0x40000000) >> 31);       \
+        (accu)  = (int64_t)(bre) * (aim);                 \
+        (accu) += (int64_t)(bim) * (are);                 \
+        (dim)   = (int)(((accu) + 0x40000000) >> 31);       \
+    } while (0)
+
+#define FIX15(a) av_clip(SCALE_FLOAT(a, 31), -2147483647, 2147483647)
+
+#else /* CONFIG_FFT_FIXED_32 */
+
 #include "fft.h"
 #include "mathops.h"
 
 void ff_mdct_calcw_c(FFTContext *s, FFTDouble *output, const FFTSample *input);
 
-#define SCALE_FLOAT(a, bits) lrint((a) * (double)(1 << (bits)))
 #define FIX15(a) av_clip(SCALE_FLOAT(a, 15), -32767, 32767)
 
 #define sqrthalf ((int16_t)((1<<15)*M_SQRT1_2))
@@ -62,6 +79,8 @@ void ff_mdct_calcw_c(FFTContext *s, FFTDouble *output, const FFTSample *input);
 #define CMULL(dre, dim, are, aim, bre, bim)     \
     CMULS(dre, dim, are, aim, bre, bim, 0)
 
+#endif /* CONFIG_FFT_FIXED_32 */
+
 #endif /* CONFIG_FFT_FLOAT */
 
 #define ff_imdct_calc_c FFT_NAME(ff_imdct_calc_c)
diff --git a/libavcodec/fft-test.c b/libavcodec/fft-test.c
index 66474cecd8..9831b2cf25 100644
--- a/libavcodec/fft-test.c
+++ b/libavcodec/fft-test.c
@@ -54,6 +54,10 @@
 #   define RANGE 1.0
 #   define REF_SCALE(x, bits)  (x)
 #   define FMT "%10.6f"
+#elif CONFIG_FFT_FIXED_32
+#   define RANGE 8388608
+#   define REF_SCALE(x, bits) (x)
+#   define FMT "%6d"
 #else
 #   define RANGE 16384
 #   define REF_SCALE(x, bits) ((x) / (1<<(bits)))
diff --git a/libavcodec/fft.c b/libavcodec/fft.c
index 84d236d558..5244dcaa8e 100644
--- a/libavcodec/fft.c
+++ b/libavcodec/fft.c
@@ -32,6 +32,10 @@
 #include "fft.h"
 #include "fft-internal.h"
 
+#if CONFIG_FFT_FIXED_32
+#include "fft_table.h"
+#else /* CONFIG_FFT_FIXED_32 */
+
 /* cos(2*pi*x/n) for 0<=x<=n/4, followed by its reverse */
 #if !CONFIG_HARDCODED_TABLES
 COSTABLE(16);
@@ -65,6 +69,8 @@ COSTABLE_CONST FFTSample * const FFT_NAME(ff_cos_tabs)[] = {
     FFT_NAME(ff_cos_65536),
 };
 
+#endif /* CONFIG_FFT_FIXED_32 */
+
 static void fft_permute_c(FFTContext *s, FFTComplex *z);
 static void fft_calc_c(FFTContext *s, FFTComplex *z);
 
@@ -81,7 +87,7 @@ static int split_radix_permutation(int i, int n, int inverse)
 
 av_cold void ff_init_ff_cos_tabs(int index)
 {
-#if !CONFIG_HARDCODED_TABLES
+#if (!CONFIG_HARDCODED_TABLES) && (!CONFIG_FFT_FIXED_32)
     int i;
     int m = 1<<index;
     double freq = 2*M_PI/m;
@@ -157,6 +163,12 @@ av_cold int ff_fft_init(FFTContext *s, int nbits, int inverse)
     s->mdct_calc   = ff_mdct_calc_c;
 #endif
 
+#if CONFIG_FFT_FIXED_32
+    {
+        int n=0;
+        ff_fft_lut_init(fft_offsets_lut, 0, 1 << 16, &n);
+    }
+#else /* CONFIG_FFT_FIXED_32 */
 #if CONFIG_FFT_FLOAT
     if (ARCH_ARM)     ff_fft_init_arm(s);
     if (ARCH_PPC)     ff_fft_init_ppc(s);
@@ -167,10 +179,11 @@ av_cold int ff_fft_init(FFTContext *s, int nbits, int inverse)
     if (CONFIG_MDCT)  s->mdct_calcw = ff_mdct_calcw_c;
     if (ARCH_ARM)     ff_fft_fixed_init_arm(s);
 #endif
-
     for(j=4; j<=nbits; j++) {
         ff_init_ff_cos_tabs(j);
     }
+#endif /* CONFIG_FFT_FIXED_32 */
+
 
     if (s->fft_permutation == FF_FFT_PERM_AVX) {
         fft_perm_avx(s);
@@ -206,6 +219,169 @@ av_cold void ff_fft_end(FFTContext *s)
     av_freep(&s->tmp_buf);
 }
 
+#if CONFIG_FFT_FIXED_32
+
+static void fft_calc_c(FFTContext *s, FFTComplex *z) {
+
+    int nbits, i, n, num_transforms, offset, step;
+    int n4, n2, n34;
+    FFTSample tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7, tmp8;
+    FFTComplex *tmpz;
+    FFTSample w_re, w_im;
+    FFTSample *w_re_ptr, *w_im_ptr;
+    const int fft_size = (1 << s->nbits);
+    int64_t accu;
+
+    num_transforms = (0x2aab >> (16 - s->nbits)) | 1;
+
+    for (n=0; n<num_transforms; n++){
+        offset = fft_offsets_lut[n] << 2;
+        tmpz = z + offset;
+
+        tmp1 = tmpz[0].re + tmpz[1].re;
+        tmp5 = tmpz[2].re + tmpz[3].re;
+        tmp2 = tmpz[0].im + tmpz[1].im;
+        tmp6 = tmpz[2].im + tmpz[3].im;
+        tmp3 = tmpz[0].re - tmpz[1].re;
+        tmp8 = tmpz[2].im - tmpz[3].im;
+        tmp4 = tmpz[0].im - tmpz[1].im;
+        tmp7 = tmpz[2].re - tmpz[3].re;
+
+        tmpz[0].re = tmp1 + tmp5;
+        tmpz[2].re = tmp1 - tmp5;
+        tmpz[0].im = tmp2 + tmp6;
+        tmpz[2].im = tmp2 - tmp6;
+        tmpz[1].re = tmp3 + tmp8;
+        tmpz[3].re = tmp3 - tmp8;
+        tmpz[1].im = tmp4 - tmp7;
+        tmpz[3].im = tmp4 + tmp7;
+    }
+
+    if (fft_size < 8)
+        return;
+
+    num_transforms = (num_transforms >> 1) | 1;
+
+    for (n=0; n<num_transforms; n++){
+        offset = fft_offsets_lut[n] << 3;
+        tmpz = z + offset;
+
+        tmp1 = tmpz[4].re + tmpz[5].re;
+        tmp3 = tmpz[6].re + tmpz[7].re;
+        tmp2 = tmpz[4].im + tmpz[5].im;
+        tmp4 = tmpz[6].im + tmpz[7].im;
+        tmp5 = tmp1 + tmp3;
+        tmp7 = tmp1 - tmp3;
+        tmp6 = tmp2 + tmp4;
+        tmp8 = tmp2 - tmp4;
+
+        tmp1 = tmpz[4].re - tmpz[5].re;
+        tmp2 = tmpz[4].im - tmpz[5].im;
+        tmp3 = tmpz[6].re - tmpz[7].re;
+        tmp4 = tmpz[6].im - tmpz[7].im;
+
+        tmpz[4].re = tmpz[0].re - tmp5;
+        tmpz[0].re = tmpz[0].re + tmp5;
+        tmpz[4].im = tmpz[0].im - tmp6;
+        tmpz[0].im = tmpz[0].im + tmp6;
+        tmpz[6].re = tmpz[2].re - tmp8;
+        tmpz[2].re = tmpz[2].re + tmp8;
+        tmpz[6].im = tmpz[2].im + tmp7;
+        tmpz[2].im = tmpz[2].im - tmp7;
+
+        accu = (int64_t)Q31(M_SQRT1_2)*(tmp1 + tmp2);
+        tmp5 = (int32_t)((accu + 0x40000000) >> 31);
+        accu = (int64_t)Q31(M_SQRT1_2)*(tmp3 - tmp4);
+        tmp7 = (int32_t)((accu + 0x40000000) >> 31);
+        accu = (int64_t)Q31(M_SQRT1_2)*(tmp2 - tmp1);
+        tmp6 = (int32_t)((accu + 0x40000000) >> 31);
+        accu = (int64_t)Q31(M_SQRT1_2)*(tmp3 + tmp4);
+        tmp8 = (int32_t)((accu + 0x40000000) >> 31);
+        tmp1 = tmp5 + tmp7;
+        tmp3 = tmp5 - tmp7;
+        tmp2 = tmp6 + tmp8;
+        tmp4 = tmp6 - tmp8;
+
+        tmpz[5].re = tmpz[1].re - tmp1;
+        tmpz[1].re = tmpz[1].re + tmp1;
+        tmpz[5].im = tmpz[1].im - tmp2;
+        tmpz[1].im = tmpz[1].im + tmp2;
+        tmpz[7].re = tmpz[3].re - tmp4;
+        tmpz[3].re = tmpz[3].re + tmp4;
+        tmpz[7].im = tmpz[3].im + tmp3;
+        tmpz[3].im = tmpz[3].im - tmp3;
+    }
+
+    step = 1 << ((MAX_LOG2_NFFT-4) - 4);
+    n4 = 4;
+
+    for (nbits=4; nbits<=s->nbits; nbits++){
+        n2  = 2*n4;
+        n34 = 3*n4;
+        num_transforms = (num_transforms >> 1) | 1;
+
+        for (n=0; n<num_transforms; n++){
+            offset = fft_offsets_lut[n] << nbits;
+            tmpz = z + offset;
+
+            tmp5 = tmpz[ n2].re + tmpz[n34].re;
+            tmp1 = tmpz[ n2].re - tmpz[n34].re;
+            tmp6 = tmpz[ n2].im + tmpz[n34].im;
+            tmp2 = tmpz[ n2].im - tmpz[n34].im;
+
+            tmpz[ n2].re = tmpz[ 0].re - tmp5;
+            tmpz[  0].re = tmpz[ 0].re + tmp5;
+            tmpz[ n2].im = tmpz[ 0].im - tmp6;
+            tmpz[  0].im = tmpz[ 0].im + tmp6;
+            tmpz[n34].re = tmpz[n4].re - tmp2;
+            tmpz[ n4].re = tmpz[n4].re + tmp2;
+            tmpz[n34].im = tmpz[n4].im + tmp1;
+            tmpz[ n4].im = tmpz[n4].im - tmp1;
+
+            w_re_ptr = w_tab_sr + step;
+            w_im_ptr = w_tab_sr + MAX_FFT_SIZE/(4*16) - step;
+
+            for (i=1; i<n4; i++){
+                w_re = w_re_ptr[0];
+                w_im = w_im_ptr[0];
+                accu  = (int64_t)w_re*tmpz[ n2+i].re;
+                accu += (int64_t)w_im*tmpz[ n2+i].im;
+                tmp1 = (int32_t)((accu + 0x40000000) >> 31);
+                accu  = (int64_t)w_re*tmpz[ n2+i].im;
+                accu -= (int64_t)w_im*tmpz[ n2+i].re;
+                tmp2 = (int32_t)((accu + 0x40000000) >> 31);
+                accu  = (int64_t)w_re*tmpz[n34+i].re;
+                accu -= (int64_t)w_im*tmpz[n34+i].im;
+                tmp3 = (int32_t)((accu + 0x40000000) >> 31);
+                accu  = (int64_t)w_re*tmpz[n34+i].im;
+                accu += (int64_t)w_im*tmpz[n34+i].re;
+                tmp4 = (int32_t)((accu + 0x40000000) >> 31);
+
+                tmp5 = tmp1 + tmp3;
+                tmp1 = tmp1 - tmp3;
+                tmp6 = tmp2 + tmp4;
+                tmp2 = tmp2 - tmp4;
+
+                tmpz[ n2+i].re = tmpz[   i].re - tmp5;
+                tmpz[    i].re = tmpz[   i].re + tmp5;
+                tmpz[ n2+i].im = tmpz[   i].im - tmp6;
+                tmpz[    i].im = tmpz[   i].im + tmp6;
+                tmpz[n34+i].re = tmpz[n4+i].re - tmp2;
+                tmpz[ n4+i].re = tmpz[n4+i].re + tmp2;
+                tmpz[n34+i].im = tmpz[n4+i].im + tmp1;
+                tmpz[ n4+i].im = tmpz[n4+i].im - tmp1;
+
+                w_re_ptr += step;
+                w_im_ptr -= step;
+            }
+        }
+        step >>= 1;
+        n4   <<= 1;
+    }
+}
+
+#else /* CONFIG_FFT_FIXED_32 */
+
 #define BUTTERFLIES(a0,a1,a2,a3) {\
     BF(t3, t5, t5, t1);\
     BF(a2.re, a0.re, a0.re, t5);\
@@ -351,3 +527,4 @@ static void fft_calc_c(FFTContext *s, FFTComplex *z)
 {
     fft_dispatch[s->nbits-2](z);
 }
+#endif /* CONFIG_FFT_FIXED_32 */
diff --git a/libavcodec/fft.h b/libavcodec/fft.h
index 910e143f5a..217090cf2a 100644
--- a/libavcodec/fft.h
+++ b/libavcodec/fft.h
@@ -26,6 +26,10 @@
 #define CONFIG_FFT_FLOAT 1
 #endif
 
+#ifndef CONFIG_FFT_FIXED_32
+#define CONFIG_FFT_FIXED_32 0
+#endif
+
 #include <stdint.h>
 #include "config.h"
 #include "libavutil/mem.h"
@@ -40,15 +44,26 @@ typedef float FFTDouble;
 
 #else
 
+#if CONFIG_FFT_FIXED_32
+
+#define Q31(x) (int)((x)*2147483648.0 + 0.5)
+#define FFT_NAME(x) x ## _fixed_32
+
+typedef int32_t FFTSample;
+
+#else /* CONFIG_FFT_FIXED_32 */
+
 #define FFT_NAME(x) x ## _fixed
 
 typedef int16_t FFTSample;
-typedef int     FFTDouble;
+
+#endif /* CONFIG_FFT_FIXED_32 */
 
 typedef struct FFTComplex {
-    int16_t re, im;
+    FFTSample re, im;
 } FFTComplex;
 
+typedef int    FFTDouble;
 typedef struct FFTContext FFTContext;
 
 #endif /* CONFIG_FFT_FLOAT */
diff --git a/libavcodec/fft_fixed.c b/libavcodec/fft_fixed.c
index 3955efea05..153b7d845d 100644
--- a/libavcodec/fft_fixed.c
+++ b/libavcodec/fft_fixed.c
@@ -17,4 +17,5 @@
  */
 
 #define CONFIG_FFT_FLOAT 0
+#define CONFIG_FFT_FIXED_32 0
 #include "fft.c"
diff --git a/libavcodec/mips/fft_init_table.c b/libavcodec/fft_fixed_32.c
index 9c2e998e9c..f2954d7d26 100644
--- a/libavcodec/mips/fft_init_table.c
+++ b/libavcodec/fft_fixed_32.c
@@ -26,7 +26,9 @@
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  *
- * Author:  Stanislav Ocovaj (socovaj@mips.com)
+ * Authors:  Stanislav Ocovaj (socovaj@mips.com)
+ *           Goran Cordasic   (goran@mips.com)
+ *           Djordje Pesut    (djordje@mips.com)
  *
  * This file is part of FFmpeg.
  *
@@ -45,23 +47,6 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
-/**
- * @file
- * definitions and initialization of LUT table for MIPS FFT
- */
-#include "fft_table.h"
-
-uint16_t fft_offsets_lut[0x2aab];
-
-void ff_fft_lut_init(uint16_t *table, int off, int size, int *index)
-{
-    if (size < 16) {
-        table[*index] = off >> 2;
-        (*index)++;
-    }
-    else {
-        ff_fft_lut_init(table, off, size>>1, index);
-        ff_fft_lut_init(table, off+(size>>1), size>>2, index);
-        ff_fft_lut_init(table, off+3*(size>>2), size>>2, index);
-    }
-}
+#define CONFIG_FFT_FLOAT 0
+#define CONFIG_FFT_FIXED_32 1
+#include "fft.c"
diff --git a/libavcodec/fft_float.c b/libavcodec/fft_float.c
index 214964631b..011dc45904 100644
--- a/libavcodec/fft_float.c
+++ b/libavcodec/fft_float.c
@@ -17,4 +17,5 @@
  */
 
 #define CONFIG_FFT_FLOAT 1
+#define CONFIG_FFT_FIXED_32 0
 #include "fft.c"
diff --git a/libavcodec/fft_init_table.c b/libavcodec/fft_init_table.c
new file mode 100644
index 0000000000..7511dbecd9
--- /dev/null
+++ b/libavcodec/fft_init_table.c
@@ -0,0 +1,200 @@
+/*
+ * Copyright (c) 2012
+ *      MIPS Technologies, Inc., California.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the MIPS Technologies, Inc., nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE MIPS TECHNOLOGIES, INC. ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE MIPS TECHNOLOGIES, INC. BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * Authors:  Stanislav Ocovaj (socovaj@mips.com)
+ *           Goran Cordasic   (goran@mips.com)
+ *           Djordje Pesut    (djordje@mips.com)
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg 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,
+ * 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
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file
+ * definitions and initialization of LUT table for FFT
+ */
+#include "libavcodec/fft_table.h"
+
+int32_t w_tab_sr[MAX_FFT_SIZE/(4*16)] = {
+    2147483647, 2147481121, 2147473542, 2147460908, 2147443222, 2147420483, 2147392690, 2147359845,
+    2147321946, 2147278995, 2147230991, 2147177934, 2147119825, 2147056664, 2146988450, 2146915184,
+    2146836866, 2146753497, 2146665076, 2146571603, 2146473080, 2146369505, 2146260881, 2146147205,
+    2146028480, 2145904705, 2145775880, 2145642006, 2145503083, 2145359112, 2145210092, 2145056025,
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+    2039096241, 2038060512, 2037019988, 2035974670, 2034924562, 2033869665, 2032809982, 2031745516,
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+    2012920201, 2011770073, 2010615210, 2009455617, 2008291295, 2007122248, 2005948478, 2004769987,
+    2003586779, 2002398857, 2001206222, 2000008879, 1998806829, 1997600076, 1996388622, 1995172471,
+    1993951625, 1992726087, 1991495860, 1990260946, 1989021350, 1987777073, 1986528118, 1985274489,
+    1984016189, 1982753220, 1981485585, 1980213288, 1978936331, 1977654717, 1976368450, 1975077532,
+    1973781967, 1972481757, 1971176906, 1969867417, 1968553292, 1967234535, 1965911148, 1964583136,
+    1963250501, 1961913246, 1960571375, 1959224890, 1957873796, 1956518093, 1955157788, 1953792881,
+    1952423377, 1951049279, 1949670589, 1948287312, 1946899451, 1945507008, 1944109987, 1942708392,
+    1941302225, 1939891490, 1938476190, 1937056329, 1935631910, 1934202936, 1932769411, 1931331338,
+    1929888720, 1928441561, 1926989864, 1925533633, 1924072871, 1922607581, 1921137767, 1919663432,
+    1918184581, 1916701216, 1915213340, 1913720958, 1912224073, 1910722688, 1909216806, 1907706433,
+    1906191570, 1904672222, 1903148392, 1901620084, 1900087301, 1898550047, 1897008325, 1895462140,
+    1893911494, 1892356392, 1890796837, 1889232832, 1887664383, 1886091491, 1884514161, 1882932397,
+    1881346202, 1879755580, 1878160535, 1876561070, 1874957189, 1873348897, 1871736196, 1870119091,
+    1868497586, 1866871683, 1865241388, 1863606704, 1861967634, 1860324183, 1858676355, 1857024153,
+    1855367581, 1853706643, 1852041343, 1850371686, 1848697674, 1847019312, 1845336604, 1843649553,
+    1841958164, 1840262441, 1838562388, 1836858008, 1835149306, 1833436286, 1831718951, 1829997307,
+    1828271356, 1826541103, 1824806552, 1823067707, 1821324572, 1819577151, 1817825449, 1816069469,
+    1814309216, 1812544694, 1810775906, 1809002858, 1807225553, 1805443995, 1803658189, 1801868139,
+    1800073849, 1798275323, 1796472565, 1794665580, 1792854372, 1791038946, 1789219305, 1787395453,
+    1785567396, 1783735137, 1781898681, 1780058032, 1778213194, 1776364172, 1774510970, 1772653593,
+    1770792044, 1768926328, 1767056450, 1765182414, 1763304224, 1761421885, 1759535401, 1757644777,
+    1755750017, 1753851126, 1751948107, 1750040966, 1748129707, 1746214334, 1744294853, 1742371267,
+    1740443581, 1738511799, 1736575927, 1734635968, 1732691928, 1730743810, 1728791620, 1726835361,
+    1724875040, 1722910659, 1720942225, 1718969740, 1716993211, 1715012642, 1713028037, 1711039401,
+    1709046739, 1707050055, 1705049355, 1703044642, 1701035922, 1699023199, 1697006479, 1694985765,
+    1692961062, 1690932376, 1688899711, 1686863072, 1684822463, 1682777890, 1680729357, 1678676870,
+    1676620432, 1674560049, 1672495725, 1670427466, 1668355276, 1666279161, 1664199124, 1662115172,
+    1660027308, 1657935539, 1655839867, 1653740300, 1651636841, 1649529496, 1647418269, 1645303166,
+    1643184191, 1641061349, 1638934646, 1636804087, 1634669676, 1632531418, 1630389319, 1628243383,
+    1626093616, 1623940023, 1621782608, 1619621377, 1617456335, 1615287487, 1613114838, 1610938393,
+    1608758157, 1606574136, 1604386335, 1602194758, 1599999411, 1597800299, 1595597428, 1593390801,
+    1591180426, 1588966306, 1586748447, 1584526854, 1582301533, 1580072489, 1577839726, 1575603251,
+    1573363068, 1571119183, 1568871601, 1566620327, 1564365367, 1562106725, 1559844408, 1557578421,
+    1555308768, 1553035455, 1550758488, 1548477872, 1546193612, 1543905714, 1541614183, 1539319024,
+    1537020244, 1534717846, 1532411837, 1530102222, 1527789007, 1525472197, 1523151797, 1520827813,
+    1518500250, 1516169114, 1513834411, 1511496145, 1509154322, 1506808949, 1504460029, 1502107570,
+    1499751576, 1497392053, 1495029006, 1492662441, 1490292364, 1487918781, 1485541696, 1483161115,
+    1480777044, 1478389489, 1475998456, 1473603949, 1471205974, 1468804538, 1466399645, 1463991302,
+    1461579514, 1459164286, 1456745625, 1454323536, 1451898025, 1449469098, 1447036760, 1444601017,
+    1442161874, 1439719338, 1437273414, 1434824109, 1432371426, 1429915374, 1427455956, 1424993180,
+    1422527051, 1420057574, 1417584755, 1415108601, 1412629117, 1410146309, 1407660183, 1405170745,
+    1402678000, 1400181954, 1397682613, 1395179984, 1392674072, 1390164882, 1387652422, 1385136696,
+    1382617710, 1380095472, 1377569986, 1375041258, 1372509294, 1369974101, 1367435685, 1364894050,
+    1362349204, 1359801152, 1357249901, 1354695455, 1352137822, 1349577007, 1347013017, 1344445857,
+    1341875533, 1339302052, 1336725419, 1334145641, 1331562723, 1328976672, 1326387494, 1323795195,
+    1321199781, 1318601257, 1315999631, 1313394909, 1310787095, 1308176198, 1305562222, 1302945174,
+    1300325060, 1297701886, 1295075659, 1292446384, 1289814068, 1287178717, 1284540337, 1281898935,
+    1279254516, 1276607086, 1273956653, 1271303222, 1268646800, 1265987392, 1263325005, 1260659646,
+    1257991320, 1255320034, 1252645794, 1249968606, 1247288478, 1244605414, 1241919421, 1239230506,
+    1236538675, 1233843935, 1231146291, 1228445750, 1225742318, 1223036002, 1220326809, 1217614743,
+    1214899813, 1212182024, 1209461382, 1206737894, 1204011567, 1201282407, 1198550419, 1195815612,
+    1193077991, 1190337562, 1187594332, 1184848308, 1182099496, 1179347902, 1176593533, 1173836395,
+    1171076495, 1168313840, 1165548435, 1162780288, 1160009405, 1157235792, 1154459456, 1151680403,
+    1148898640, 1146114174, 1143327011, 1140537158, 1137744621, 1134949406, 1132151521, 1129350972,
+    1126547765, 1123741908, 1120933406, 1118122267, 1115308496, 1112492101, 1109673089, 1106851465,
+    1104027237, 1101200410, 1098370993, 1095538991, 1092704411, 1089867259, 1087027544, 1084185270,
+    1081340445, 1078493076, 1075643169, 1072790730, 1069935768, 1067078288, 1064218296, 1061355801,
+    1058490808, 1055623324, 1052753357, 1049880912, 1047005996, 1044128617, 1041248781, 1038366495,
+    1035481766, 1032594600, 1029705004, 1026812985, 1023918550, 1021021705, 1018122458, 1015220816,
+    1012316784, 1009410370, 1006501581, 1003590424, 1000676905,  997761031,  994842810,  991922248,
+     988999351,  986074127,  983146583,  980216726,  977284562,  974350098,  971413342,  968474300,
+     965532978,  962589385,  959643527,  956695411,  953745043,  950792431,  947837582,  944880503,
+     941921200,  938959681,  935995952,  933030021,  930061894,  927091579,  924119082,  921144411,
+     918167572,  915188572,  912207419,  909224120,  906238681,  903251110,  900261413,  897269597,
+     894275671,  891279640,  888281512,  885281293,  882278992,  879274614,  876268167,  873259659,
+     870249095,  867236484,  864221832,  861205147,  858186435,  855165703,  852142959,  849118210,
+     846091463,  843062726,  840032004,  836999305,  833964638,  830928007,  827889422,  824848888,
+     821806413,  818762005,  815715670,  812667415,  809617249,  806565177,  803511207,  800455346,
+     797397602,  794337982,  791276492,  788213141,  785147934,  782080880,  779011986,  775941259,
+     772868706,  769794334,  766718151,  763640164,  760560380,  757478806,  754395449,  751310318,
+     748223418,  745134758,  742044345,  738952186,  735858287,  732762657,  729665303,  726566232,
+     723465451,  720362968,  717258790,  714152924,  711045377,  707936158,  704825272,  701712728,
+     698598533,  695482694,  692365218,  689246113,  686125387,  683003045,  679879097,  676753549,
+     673626408,  670497682,  667367379,  664235505,  661102068,  657967075,  654830535,  651692453,
+     648552838,  645411696,  642269036,  639124865,  635979190,  632832018,  629683357,  626533215,
+     623381598,  620228514,  617073971,  613917975,  610760536,  607601658,  604441352,  601279623,
+     598116479,  594951927,  591785976,  588618632,  585449903,  582279796,  579108320,  575935480,
+     572761285,  569585743,  566408860,  563230645,  560051104,  556870245,  553688076,  550504604,
+     547319836,  544133781,  540946445,  537757837,  534567963,  531376831,  528184449,  524990824,
+     521795963,  518599875,  515402566,  512204045,  509004318,  505803394,  502601279,  499397982,
+     496193509,  492987869,  489781069,  486573117,  483364019,  480153784,  476942419,  473729932,
+     470516330,  467301622,  464085813,  460868912,  457650927,  454431865,  451211734,  447990541,
+     444768294,  441545000,  438320667,  435095303,  431868915,  428641511,  425413098,  422183684,
+     418953276,  415721883,  412489512,  409256170,  406021865,  402786604,  399550396,  396313247,
+     393075166,  389836160,  386596237,  383355404,  380113669,  376871039,  373627523,  370383128,
+     367137861,  363891730,  360644742,  357396906,  354148230,  350898719,  347648383,  344397230,
+     341145265,  337892498,  334638936,  331384586,  328129457,  324873555,  321616889,  318359466,
+     315101295,  311842381,  308582734,  305322361,  302061269,  298799466,  295536961,  292273760,
+     289009871,  285745302,  282480061,  279214155,  275947592,  272680379,  269412525,  266144038,
+     262874923,  259605191,  256334847,  253063900,  249792358,  246520228,  243247518,  239974235,
+     236700388,  233425984,  230151030,  226875535,  223599506,  220322951,  217045878,  213768293,
+     210490206,  207211624,  203932553,  200653003,  197372981,  194092495,  190811551,  187530159,
+     184248325,  180966058,  177683365,  174400254,  171116733,  167832808,  164548489,  161263783,
+     157978697,  154693240,  151407418,  148121241,  144834714,  141547847,  138260647,  134973122,
+     131685278,  128397125,  125108670,  121819921,  118530885,  115241570,  111951983,  108662134,
+     105372028,  102081675,   98791081,   95500255,   92209205,   88917937,   85626460,   82334782,
+      79042909,   75750851,   72458615,   69166208,   65873638,   62580914,   59288042,   55995030,
+      52701887,   49408620,   46115236,   42821744,   39528151,   36234466,   32940695,   29646846,
+      26352928,   23058947,   19764913,   16470832,   13176712,    9882561,    6588387,    3294197
+};
+
+uint16_t fft_offsets_lut[0x2aab];
+
+void ff_fft_lut_init(uint16_t *table, int off, int size, int *index)
+{
+    if (size < 16) {
+        table[*index] = off >> 2;
+        (*index)++;
+    }
+    else {
+        ff_fft_lut_init(table, off, size>>1, index);
+        ff_fft_lut_init(table, off+(size>>1), size>>2, index);
+        ff_fft_lut_init(table, off+3*(size>>2), size>>2, index);
+    }
+}
diff --git a/libavcodec/mips/fft_table.h b/libavcodec/fft_table.h
index dd52eaf8c8..687e5b94fd 100644
--- a/libavcodec/mips/fft_table.h
+++ b/libavcodec/fft_table.h
@@ -26,7 +26,9 @@
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  *
- * Author:  Stanislav Ocovaj (socovaj@mips.com)
+ * Authors:  Stanislav Ocovaj (socovaj@mips.com)
+ *           Goran Cordasic   (goran@mips.com)
+ *           Djordje Pesut    (djordje@mips.com)
  *
  * This file is part of FFmpeg.
  *
@@ -47,17 +49,18 @@
 
 /**
  * @file
- * definitions and LUT table for MIPS FFT
+ * definitions and tables for FFT
  */
-#ifndef AVCODEC_MIPS_FFT_TABLE_H
-#define AVCODEC_MIPS_FFT_TABLE_H
+#ifndef AVCODEC_FFT_TABLE_H
+#define AVCODEC_FFT_TABLE_H
 
 #include "libavcodec/fft.h"
 
 #define MAX_LOG2_NFFT 16 //!< Specifies maxiumum allowed fft size
 #define MAX_FFT_SIZE (1 << MAX_LOG2_NFFT)
 
+extern int32_t w_tab_sr[];
 extern uint16_t fft_offsets_lut[];
 void ff_fft_lut_init(uint16_t *table, int off, int size, int *index);
 
-#endif /* AVCODEC_MIPS_FFT_TABLE_H */
+#endif /* AVCODEC_FFT_TABLE_H */
diff --git a/libavcodec/mdct.c b/libavcodec/mdct.c
index 22320240de..922d577e3e 100644
--- a/libavcodec/mdct.c
+++ b/libavcodec/mdct.c
@@ -34,7 +34,11 @@
 #if CONFIG_FFT_FLOAT
 #   define RSCALE(x) (x)
 #else
+#if CONFIG_FFT_FIXED_32
+#   define RSCALE(x) (((x) + 32) >> 6)
+#else /* CONFIG_FFT_FIXED_32 */
 #   define RSCALE(x) ((x) >> 1)
+#endif /* CONFIG_FFT_FIXED_32 */
 #endif
 
 /**
diff --git a/libavcodec/mdct_fixed.c b/libavcodec/mdct_fixed.c
index 794a3e0bc2..33a266d8cb 100644
--- a/libavcodec/mdct_fixed.c
+++ b/libavcodec/mdct_fixed.c
@@ -17,6 +17,7 @@
  */
 
 #define CONFIG_FFT_FLOAT 0
+#define CONFIG_FFT_FIXED_32 0
 #include "mdct.c"
 
 /* same as ff_mdct_calcw_c with double-width unscaled output */
diff --git a/libavcodec/mdct_fixed_32.c b/libavcodec/mdct_fixed_32.c
new file mode 100644
index 0000000000..66226f3e69
--- /dev/null
+++ b/libavcodec/mdct_fixed_32.c
@@ -0,0 +1,52 @@
+/*
+ * Copyright (c) 2012
+ *      MIPS Technologies, Inc., California.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the MIPS Technologies, Inc., nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE MIPS TECHNOLOGIES, INC. ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE MIPS TECHNOLOGIES, INC. BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * Authors:  Stanislav Ocovaj (socovaj@mips.com)
+ *           Goran Cordasic   (goran@mips.com)
+ *           Djordje Pesut    (djordje@mips.com)
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg 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,
+ * 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
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#define CONFIG_FFT_FLOAT 0
+#define CONFIG_FFT_FIXED_32 1
+#include "mdct.c"
diff --git a/libavcodec/mdct_float.c b/libavcodec/mdct_float.c
index ec4f486f19..fec18bab36 100644
--- a/libavcodec/mdct_float.c
+++ b/libavcodec/mdct_float.c
@@ -17,4 +17,5 @@
  */
 
 #define CONFIG_FFT_FLOAT 1
+#define CONFIG_FFT_FIXED_32 0
 #include "mdct.c"
diff --git a/libavcodec/mips/Makefile b/libavcodec/mips/Makefile
index a2ea412305..6537b43110 100644
--- a/libavcodec/mips/Makefile
+++ b/libavcodec/mips/Makefile
@@ -9,7 +9,6 @@ MIPSFPU-OBJS-$(CONFIG_AMRWB_DECODER)      += mips/acelp_filters_mips.o     \
                                              mips/acelp_vectors_mips.o
 MIPSFPU-OBJS-$(CONFIG_MPEGAUDIODSP)       += mips/mpegaudiodsp_mips_float.o
 MIPSDSPR1-OBJS-$(CONFIG_MPEGAUDIODSP)     += mips/mpegaudiodsp_mips_fixed.o
-OBJS-$(CONFIG_FFT)                        += mips/fft_init_table.o
 MIPSFPU-OBJS-$(CONFIG_FFT)                += mips/fft_mips.o
 MIPSFPU-OBJS                              += mips/fmtconvert_mips.o
 OBJS-$(CONFIG_AC3DSP)                     += mips/ac3dsp_mips.o
diff --git a/libavcodec/mips/fft_mips.c b/libavcodec/mips/fft_mips.c
index ae4ed30347..d240f1f0fb 100644
--- a/libavcodec/mips/fft_mips.c
+++ b/libavcodec/mips/fft_mips.c
@@ -49,7 +49,7 @@
  */
 #include "config.h"
 #include "libavcodec/fft.h"
-#include "fft_table.h"
+#include "libavcodec/fft_table.h"
 
 /**
  * FFT transform
diff --git a/tests/fate/fft.mak b/tests/fate/fft.mak
index 20d563828f..2413415c21 100644
--- a/tests/fate/fft.mak
+++ b/tests/fate/fft.mak
@@ -38,5 +38,22 @@ $(FATE_FFT_FIXED): libavcodec/fft-fixed-test$(EXESUF)
 $(FATE_FFT_FIXED): CMD = run libavcodec/fft-fixed-test $(CPUFLAGS:%=-c%) $(ARGS)
 $(FATE_FFT_FIXED): REF = /dev/null
 
-FATE-$(call ALLYES, AVCODEC FFT) += $(FATE_FFT) $(FATE_FFT_FIXED)
-fate-fft: $(FATE_FFT) $(FATE_FFT_FIXED)
+define DEF_FFT_FIXED32
+FATE_FFT_FIXED32 += fate-fft-fixed32-$(1)   fate-ifft-fixed32-$(1)  \
+                  fate-mdct-fixed32-$(1) fate-imdct-fixed32-$(1)
+
+fate-fft-fixed32-$(1):   ARGS = -n$(1)
+fate-ifft-fixed32-$(1):  ARGS = -n$(1) -i
+#fate-mdct-fixed32-$(1):  ARGS = -n$(1) -m
+fate-imdct-fixed32-$(1): ARGS = -n$(1) -m -i
+endef
+
+$(foreach N, 4 5 6 7 8 9 10 11 12, $(eval $(call DEF_FFT_FIXED32,$(N))))
+
+fate-fft-fixed32-test: $(FATE_FFT_FIXED32)
+$(FATE_FFT_FIXED32): libavcodec/fft-fixed32-test$(EXESUF)
+$(FATE_FFT_FIXED32): CMD = run libavcodec/fft-fixed32-test $(CPUFLAGS:%=-c%) $(ARGS)
+$(FATE_FFT_FIXED32): REF = /dev/null
+
+FATE-$(call ALLYES, AVCODEC FFT) += $(FATE_FFT) $(FATE_FFT_FIXED) $(FATE_FFT_FIXED32)
+fate-fft: $(FATE_FFT) $(FATE_FFT_FIXED) $(FATE_FFT_FIXED32)