flacdec: split off channel decorrelation as flacdsp

Signed-off-by: Mans Rullgard <mans@mansr.com>

1 files changed, 86 insertions, 0 deletions

diff --git a/libavcodec/flacdsp_template.c b/libavcodec/flacdsp_template.c
new file mode 100644
index 0000000000..34da5a6d25
--- /dev/null
+++ b/libavcodec/flacdsp_template.c
@@ -0,0 +1,86 @@
+/*
+ * Copyright (c) 2012 Mans Rullgard <mans@mansr.com>
+ *
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ *
+ * Libav 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 Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <stdint.h>
+
+#undef FUNC
+#undef sample
+
+#if SAMPLE_SIZE == 32
+#   define FUNC(n) n ## _32
+#   define sample  int32_t
+#else
+#   define FUNC(n) n ## _16
+#   define sample  int16_t
+#endif
+
+static void FUNC(flac_decorrelate_indep_c)(uint8_t **out, int32_t **in,
+                                           int channels, int len, int shift)
+{
+    sample *samples = (sample *) out[0];
+    int i, j;
+
+    for (j = 0; j < len; j++)
+        for (i = 0; i < channels; i++)
+            *samples++ = in[i][j] << shift;
+}
+
+static void FUNC(flac_decorrelate_ls_c)(uint8_t **out, int32_t **in,
+                                        int channels, int len, int shift)
+{
+    sample *samples = (sample *) out[0];
+    int i;
+
+    for (i = 0; i < len; i++) {
+        int a = in[0][i];
+        int b = in[1][i];
+        *samples++ =  a      << shift;
+        *samples++ = (a - b) << shift;
+    }
+}
+
+static void FUNC(flac_decorrelate_rs_c)(uint8_t **out, int32_t **in,
+                                        int channels, int len, int shift)
+{
+    sample *samples = (sample *) out[0];
+    int i;
+
+    for (i = 0; i < len; i++) {
+        int a = in[0][i];
+        int b = in[1][i];
+        *samples++ = (a + b) << shift;
+        *samples++ =  b      << shift;
+    }
+}
+
+static void FUNC(flac_decorrelate_ms_c)(uint8_t **out, int32_t **in,
+                                        int channels, int len, int shift)
+{
+    sample *samples = (sample *) out[0];
+    int i;
+
+    for (i = 0; i < len; i++) {
+        int a = in[0][i];
+        int b = in[1][i];
+        a -= b >> 1;
+        *samples++ = (a + b) << shift;
+        *samples++ =  a      << shift;
+    }
+}