avcodec/synth_filter: add more filters

libavcodec/synth_filter.c

 /*
  * copyright (c) 2008 Michael Niedermayer <michaelni@gmx.at>
+ * Copyright (C) 2016 foo86
  *
  * This file is part of FFmpeg.
  *
@@ -19,6 +20,8 @@
  */
 
 #include "fft.h"
+#include "dcadct.h"
+#include "dcamath.h"
 #include "synth_filter.h"
 
 static void synth_filter_float(FFTContext *imdct,
@@ -57,9 +60,120 @@ static void synth_filter_float(FFTContext *imdct,
     *synth_buf_offset = (*synth_buf_offset - 32) & 511;
 }
 
+static void synth_filter_float_64(FFTContext *imdct,
+                                  float *synth_buf_ptr, int *synth_buf_offset,
+                                  float synth_buf2[64], const float window[1024],
+                                  float out[64], const float in[64], float scale)
+{
+    float *synth_buf = synth_buf_ptr + *synth_buf_offset;
+    int i, j;
+
+    imdct->imdct_half(imdct, synth_buf, in);
+
+    for (i = 0; i < 32; i++) {
+        float a = synth_buf2[i     ];
+        float b = synth_buf2[i + 32];
+        float c = 0;
+        float d = 0;
+        for (j = 0; j < 1024 - *synth_buf_offset; j += 128) {
+            a += window[i + j     ] * (-synth_buf[31 - i + j       ]);
+            b += window[i + j + 32] * ( synth_buf[     i + j       ]);
+            c += window[i + j + 64] * ( synth_buf[32 + i + j       ]);
+            d += window[i + j + 96] * ( synth_buf[63 - i + j       ]);
+        }
+        for (     ; j < 1024; j += 128) {
+            a += window[i + j     ] * (-synth_buf[31 - i + j - 1024]);
+            b += window[i + j + 32] * ( synth_buf[     i + j - 1024]);
+            c += window[i + j + 64] * ( synth_buf[32 + i + j - 1024]);
+            d += window[i + j + 96] * ( synth_buf[63 - i + j - 1024]);
+        }
+        out[i     ] = a * scale;
+        out[i + 32] = b * scale;
+        synth_buf2[i     ] = c;
+        synth_buf2[i + 32] = d;
+    }
+
+    *synth_buf_offset = (*synth_buf_offset - 64) & 1023;
+}
+
+static void synth_filter_fixed(DCADCTContext *imdct,
+                               int32_t *synth_buf_ptr, int *synth_buf_offset,
+                               int32_t synth_buf2[32], const int32_t window[512],
+                               int32_t out[32], const int32_t in[32])
+{
+    int32_t *synth_buf = synth_buf_ptr + *synth_buf_offset;
+    int i, j;
+
+    imdct->imdct_half[0](synth_buf, in);
+
+    for (i = 0; i < 16; i++) {
+        int64_t a = synth_buf2[i     ] * (INT64_C(1) << 21);
+        int64_t b = synth_buf2[i + 16] * (INT64_C(1) << 21);
+        int64_t c = 0;
+        int64_t d = 0;
+        for (j = 0; j < 512 - *synth_buf_offset; j += 64) {
+            a += (int64_t)window[i + j     ] * synth_buf[     i + j      ];
+            b += (int64_t)window[i + j + 16] * synth_buf[15 - i + j      ];
+            c += (int64_t)window[i + j + 32] * synth_buf[16 + i + j      ];
+            d += (int64_t)window[i + j + 48] * synth_buf[31 - i + j      ];
+        }
+        for (     ; j < 512; j += 64) {
+            a += (int64_t)window[i + j     ] * synth_buf[     i + j - 512];
+            b += (int64_t)window[i + j + 16] * synth_buf[15 - i + j - 512];
+            c += (int64_t)window[i + j + 32] * synth_buf[16 + i + j - 512];
+            d += (int64_t)window[i + j + 48] * synth_buf[31 - i + j - 512];
+        }
+        out[i     ] = clip23(norm21(a));
+        out[i + 16] = clip23(norm21(b));
+        synth_buf2[i     ] = norm21(c);
+        synth_buf2[i + 16] = norm21(d);
+    }
+
+    *synth_buf_offset = (*synth_buf_offset - 32) & 511;
+}
+
+static void synth_filter_fixed_64(DCADCTContext *imdct,
+                                  int32_t *synth_buf_ptr, int *synth_buf_offset,
+                                  int32_t synth_buf2[64], const int32_t window[1024],
+                                  int32_t out[64], const int32_t in[64])
+{
+    int32_t *synth_buf = synth_buf_ptr + *synth_buf_offset;
+    int i, j;
+
+    imdct->imdct_half[1](synth_buf, in);
+
+    for (i = 0; i < 32; i++) {
+        int64_t a = synth_buf2[i     ] * (INT64_C(1) << 20);
+        int64_t b = synth_buf2[i + 32] * (INT64_C(1) << 20);
+        int64_t c = 0;
+        int64_t d = 0;
+        for (j = 0; j < 1024 - *synth_buf_offset; j += 128) {
+            a += (int64_t)window[i + j     ] * synth_buf[     i + j       ];
+            b += (int64_t)window[i + j + 32] * synth_buf[31 - i + j       ];
+            c += (int64_t)window[i + j + 64] * synth_buf[32 + i + j       ];
+            d += (int64_t)window[i + j + 96] * synth_buf[63 - i + j       ];
+        }
+        for (     ; j < 1024; j += 128) {
+            a += (int64_t)window[i + j     ] * synth_buf[     i + j - 1024];
+            b += (int64_t)window[i + j + 32] * synth_buf[31 - i + j - 1024];
+            c += (int64_t)window[i + j + 64] * synth_buf[32 + i + j - 1024];
+            d += (int64_t)window[i + j + 96] * synth_buf[63 - i + j - 1024];
+        }
+        out[i     ] = clip23(norm20(a));
+        out[i + 32] = clip23(norm20(b));
+        synth_buf2[i     ] = norm20(c);
+        synth_buf2[i + 32] = norm20(d);
+    }
+
+    *synth_buf_offset = (*synth_buf_offset - 64) & 1023;
+}
+
 av_cold void ff_synth_filter_init(SynthFilterContext *c)
 {
-    c->synth_filter_float = synth_filter_float;
+    c->synth_filter_float    = synth_filter_float;
+    c->synth_filter_float_64 = synth_filter_float_64;
+    c->synth_filter_fixed    = synth_filter_fixed;
+    c->synth_filter_fixed_64 = synth_filter_fixed_64;
 
     if (ARCH_AARCH64)
         ff_synth_filter_init_aarch64(c);

libavcodec/synth_filter.h

@@ -22,6 +22,7 @@
 #define AVCODEC_SYNTH_FILTER_H
 
 #include "fft.h"
+#include "dcadct.h"
 
 typedef struct SynthFilterContext {
     void (*synth_filter_float)(FFTContext *imdct,
@@ -29,6 +30,18 @@ typedef struct SynthFilterContext {
                                float synth_buf2[32], const float window[512],
                                float out[32], const float in[32],
                                float scale);
+    void (*synth_filter_float_64)(FFTContext *imdct,
+                                  float *synth_buf_ptr, int *synth_buf_offset,
+                                  float synth_buf2[64], const float window[1024],
+                                  float out[64], const float in[64], float scale);
+    void (*synth_filter_fixed)(DCADCTContext *imdct,
+                               int32_t *synth_buf_ptr, int *synth_buf_offset,
+                               int32_t synth_buf2[32], const int32_t window[512],
+                               int32_t out[32], const int32_t in[32]);
+    void (*synth_filter_fixed_64)(DCADCTContext *imdct,
+                                  int32_t *synth_buf_ptr, int *synth_buf_offset,
+                                  int32_t synth_buf2[64], const int32_t window[1024],
+                                  int32_t out[64], const int32_t in[64]);
 } SynthFilterContext;
 
 void ff_synth_filter_init(SynthFilterContext *c);