ffmpeg-2.8.5

git-svn-id: svn://kolibrios.org@6147 a494cfbc-eb01-0410-851d-a64ba20cac60

contrib/sdk/sources/ffmpeg/ffmpeg-2.8/libavcodec/audiodsp.c

@@ -0,0 +1,118 @@
+/*
+ * 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 <stdint.h>
+
+#include "libavutil/attributes.h"
+#include "libavutil/common.h"
+#include "audiodsp.h"
+
+static inline uint32_t clipf_c_one(uint32_t a, uint32_t mini,
+                                   uint32_t maxi, uint32_t maxisign)
+{
+    if (a > mini)
+        return mini;
+    else if ((a ^ (1U << 31)) > maxisign)
+        return maxi;
+    else
+        return a;
+}
+
+static void vector_clipf_c_opposite_sign(float *dst, const float *src,
+                                         float *min, float *max, int len)
+{
+    int i;
+    uint32_t mini        = *(uint32_t *) min;
+    uint32_t maxi        = *(uint32_t *) max;
+    uint32_t maxisign    = maxi ^ (1U << 31);
+    uint32_t *dsti       = (uint32_t *) dst;
+    const uint32_t *srci = (const uint32_t *) src;
+
+    for (i = 0; i < len; i += 8) {
+        dsti[i + 0] = clipf_c_one(srci[i + 0], mini, maxi, maxisign);
+        dsti[i + 1] = clipf_c_one(srci[i + 1], mini, maxi, maxisign);
+        dsti[i + 2] = clipf_c_one(srci[i + 2], mini, maxi, maxisign);
+        dsti[i + 3] = clipf_c_one(srci[i + 3], mini, maxi, maxisign);
+        dsti[i + 4] = clipf_c_one(srci[i + 4], mini, maxi, maxisign);
+        dsti[i + 5] = clipf_c_one(srci[i + 5], mini, maxi, maxisign);
+        dsti[i + 6] = clipf_c_one(srci[i + 6], mini, maxi, maxisign);
+        dsti[i + 7] = clipf_c_one(srci[i + 7], mini, maxi, maxisign);
+    }
+}
+
+static void vector_clipf_c(float *dst, const float *src,
+                           float min, float max, int len)
+{
+    int i;
+
+    if (min < 0 && max > 0) {
+        vector_clipf_c_opposite_sign(dst, src, &min, &max, len);
+    } else {
+        for (i = 0; i < len; i += 8) {
+            dst[i]     = av_clipf(src[i], min, max);
+            dst[i + 1] = av_clipf(src[i + 1], min, max);
+            dst[i + 2] = av_clipf(src[i + 2], min, max);
+            dst[i + 3] = av_clipf(src[i + 3], min, max);
+            dst[i + 4] = av_clipf(src[i + 4], min, max);
+            dst[i + 5] = av_clipf(src[i + 5], min, max);
+            dst[i + 6] = av_clipf(src[i + 6], min, max);
+            dst[i + 7] = av_clipf(src[i + 7], min, max);
+        }
+    }
+}
+
+static int32_t scalarproduct_int16_c(const int16_t *v1, const int16_t *v2,
+                                     int order)
+{
+    int res = 0;
+
+    while (order--)
+        res += *v1++ **v2++;
+
+    return res;
+}
+
+static void vector_clip_int32_c(int32_t *dst, const int32_t *src, int32_t min,
+                                int32_t max, unsigned int len)
+{
+    do {
+        *dst++ = av_clip(*src++, min, max);
+        *dst++ = av_clip(*src++, min, max);
+        *dst++ = av_clip(*src++, min, max);
+        *dst++ = av_clip(*src++, min, max);
+        *dst++ = av_clip(*src++, min, max);
+        *dst++ = av_clip(*src++, min, max);
+        *dst++ = av_clip(*src++, min, max);
+        *dst++ = av_clip(*src++, min, max);
+        len   -= 8;
+    } while (len > 0);
+}
+
+av_cold void ff_audiodsp_init(AudioDSPContext *c)
+{
+    c->scalarproduct_int16 = scalarproduct_int16_c;
+    c->vector_clip_int32   = vector_clip_int32_c;
+    c->vector_clipf        = vector_clipf_c;
+
+    if (ARCH_ARM)
+        ff_audiodsp_init_arm(c);
+    if (ARCH_PPC)
+        ff_audiodsp_init_ppc(c);
+    if (ARCH_X86)
+        ff_audiodsp_init_x86(c);
+}