Issue #2311 - Part 1 - Add ffmpeg's own floating point real FFT functions to ffvpx

Instead of using Libav's.

media/ffvpx/libavcodec/x86/fft.h

@@ -0,0 +1,38 @@
+/*
+ * 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
+ */
+
+#ifndef AVCODEC_X86_FFT_H
+#define AVCODEC_X86_FFT_H
+
+#include "libavcodec/fft.h"
+
+void ff_fft_permute_sse(FFTContext *s, FFTComplex *z);
+void ff_fft_calc_avx(FFTContext *s, FFTComplex *z);
+void ff_fft_calc_sse(FFTContext *s, FFTComplex *z);
+void ff_fft_calc_3dnow(FFTContext *s, FFTComplex *z);
+void ff_fft_calc_3dnowext(FFTContext *s, FFTComplex *z);
+
+void ff_imdct_calc_3dnow(FFTContext *s, FFTSample *output, const FFTSample *input);
+void ff_imdct_half_3dnow(FFTContext *s, FFTSample *output, const FFTSample *input);
+void ff_imdct_calc_3dnowext(FFTContext *s, FFTSample *output, const FFTSample *input);
+void ff_imdct_half_3dnowext(FFTContext *s, FFTSample *output, const FFTSample *input);
+void ff_imdct_calc_sse(FFTContext *s, FFTSample *output, const FFTSample *input);
+void ff_imdct_half_sse(FFTContext *s, FFTSample *output, const FFTSample *input);
+void ff_imdct_half_avx(FFTContext *s, FFTSample *output, const FFTSample *input);
+
+#endif /* AVCODEC_X86_FFT_H */

media/ffvpx/libavcodec/x86/fft_init.c

@@ -0,0 +1,61 @@
+/*
+ * 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
+ */
+
+#include "config.h"
+
+#include "libavutil/attributes.h"
+#include "libavutil/cpu.h"
+#include "libavutil/x86/cpu.h"
+
+#include "fft.h"
+
+av_cold void ff_fft_init_x86(FFTContext *s)
+{
+    int cpu_flags = av_get_cpu_flags();
+
+    if (s->nbits > 16)
+        return;
+
+#if ARCH_X86_32
+    if (EXTERNAL_AMD3DNOW(cpu_flags)) {
+        s->imdct_calc = ff_imdct_calc_3dnow;
+        s->imdct_half = ff_imdct_half_3dnow;
+        s->fft_calc   = ff_fft_calc_3dnow;
+    }
+
+    if (EXTERNAL_AMD3DNOWEXT(cpu_flags)) {
+        s->imdct_calc = ff_imdct_calc_3dnowext;
+        s->imdct_half = ff_imdct_half_3dnowext;
+        s->fft_calc   = ff_fft_calc_3dnowext;
+    }
+#endif /* ARCH_X86_32 */
+
+    if (EXTERNAL_SSE(cpu_flags)) {
+        s->imdct_calc  = ff_imdct_calc_sse;
+        s->imdct_half  = ff_imdct_half_sse;
+        s->fft_permute = ff_fft_permute_sse;
+        s->fft_calc    = ff_fft_calc_sse;
+        s->fft_permutation = FF_FFT_PERM_SWAP_LSBS;
+    }
+
+    if (EXTERNAL_AVX_FAST(cpu_flags) && s->nbits >= 5) {
+        s->imdct_half      = ff_imdct_half_avx;
+        s->fft_calc        = ff_fft_calc_avx;
+        s->fft_permutation = FF_FFT_PERM_AVX;
+    }
+}

media/ffvpx/libavcodec/x86/moz.build

@@ -29,6 +29,12 @@ SOURCES += [
     'vp9mc_16bpp.asm',
 ]
 
+if CONFIG['MOZ_LIBAV_FFT']:
+    SOURCES += [
+        'fft.asm',
+        'fft_init.c',
+    ]
+
 FINAL_LIBRARY = 'mozavcodec'
 
 include('/media/ffvpx/ffvpxcommon.mozbuild')