From 8992cb1d0d07edc33d274f6d7924ecdf6f83d994 Mon Sep 17 00:00:00 2001
From: Tim Redfern <tim@eclectronics.org>
Date: Thu, 5 Sep 2013 17:57:22 +0100
Subject: making act segmenter

---
 ffmpeg/libavcodec/fmtconvert.c | 121 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 121 insertions(+)
 create mode 100644 ffmpeg/libavcodec/fmtconvert.c

(limited to 'ffmpeg/libavcodec/fmtconvert.c')

diff --git a/ffmpeg/libavcodec/fmtconvert.c b/ffmpeg/libavcodec/fmtconvert.c
new file mode 100644
index 0000000..79e9645
--- /dev/null
+++ b/ffmpeg/libavcodec/fmtconvert.c
@@ -0,0 +1,121 @@
+/*
+ * Format Conversion Utils
+ * Copyright (c) 2000, 2001 Fabrice Bellard
+ * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
+ *
+ * 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 "avcodec.h"
+#include "fmtconvert.h"
+#include "libavutil/common.h"
+
+static void int32_to_float_fmul_scalar_c(float *dst, const int *src, float mul, int len){
+    int i;
+    for(i=0; i<len; i++)
+        dst[i] = src[i] * mul;
+}
+
+static av_always_inline int float_to_int16_one(const float *src){
+    return av_clip_int16(lrintf(*src));
+}
+
+static void float_to_int16_c(int16_t *dst, const float *src, long len)
+{
+    int i;
+    for(i=0; i<len; i++)
+        dst[i] = float_to_int16_one(src+i);
+}
+
+static void float_to_int16_interleave_c(int16_t *dst, const float **src,
+                                        long len, int channels)
+{
+    int i,j,c;
+    if(channels==2){
+        for(i=0; i<len; i++){
+            dst[2*i]   = float_to_int16_one(src[0]+i);
+            dst[2*i+1] = float_to_int16_one(src[1]+i);
+        }
+    }else{
+        for(c=0; c<channels; c++)
+            for(i=0, j=c; i<len; i++, j+=channels)
+                dst[j] = float_to_int16_one(src[c]+i);
+    }
+}
+
+void ff_float_interleave_c(float *dst, const float **src, unsigned int len,
+                           int channels)
+{
+    int j, c;
+    unsigned int i;
+    if (channels == 2) {
+        for (i = 0; i < len; i++) {
+            dst[2*i]   = src[0][i];
+            dst[2*i+1] = src[1][i];
+        }
+    } else if (channels == 1 && len < INT_MAX / sizeof(float)) {
+        memcpy(dst, src[0], len * sizeof(float));
+    } else {
+        for (c = 0; c < channels; c++)
+            for (i = 0, j = c; i < len; i++, j += channels)
+                dst[j] = src[c][i];
+    }
+}
+
+av_cold void ff_fmt_convert_init(FmtConvertContext *c, AVCodecContext *avctx)
+{
+    c->int32_to_float_fmul_scalar = int32_to_float_fmul_scalar_c;
+    c->float_to_int16             = float_to_int16_c;
+    c->float_to_int16_interleave  = float_to_int16_interleave_c;
+    c->float_interleave           = ff_float_interleave_c;
+
+    if (ARCH_ARM) ff_fmt_convert_init_arm(c, avctx);
+    if (HAVE_ALTIVEC) ff_fmt_convert_init_altivec(c, avctx);
+    if (ARCH_X86) ff_fmt_convert_init_x86(c, avctx);
+    if (HAVE_MIPSFPU) ff_fmt_convert_init_mips(c);
+}
+
+/* ffdshow custom code */
+void float_interleave(float *dst, const float **src, long len, int channels)
+{
+    int i,j,c;
+    if(channels==2){
+        for(i=0; i<len; i++){
+            dst[2*i]   = src[0][i] / 32768.0f;
+            dst[2*i+1] = src[1][i] / 32768.0f;
+        }
+    }else{
+        for(c=0; c<channels; c++)
+            for(i=0, j=c; i<len; i++, j+=channels)
+                dst[j] = src[c][i] / 32768.0f;
+    }
+}
+
+void float_interleave_noscale(float *dst, const float **src, long len, int channels)
+{
+    int i,j,c;
+    if(channels==2){
+        for(i=0; i<len; i++){
+            dst[2*i]   = src[0][i];
+            dst[2*i+1] = src[1][i];
+        }
+    }else{
+        for(c=0; c<channels; c++)
+            for(i=0, j=c; i<len; i++, j+=channels)
+                dst[j] = src[c][i];
+    }
+}
-- 
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