audio merge (malc)

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@1125 c046a42c-6fe2-441c-8c8c-71466251a162

1 files changed, 111 insertions, 0 deletions

diff --git a/audio/mixeng_template.h b/audio/mixeng_template.h
new file mode 100644
index 0000000000..f3b3f654fd
--- /dev/null
+++ b/audio/mixeng_template.h
@@ -0,0 +1,111 @@
+/*
+ * QEMU Mixing engine
+ * 
+ * Copyright (c) 2004 Vassili Karpov (malc)
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+/*
+ * Tusen tack till Mike Nordell
+ * dec++'ified by Dscho
+ */
+
+#ifdef SIGNED
+#define HALFT IN_MAX
+#define HALF IN_MAX
+#else
+#define HALFT ((IN_MAX)>>1)
+#define HALF HALFT
+#endif
+
+static int64_t inline glue(conv_,IN_T) (IN_T v)
+{
+#ifdef SIGNED
+    return (INT_MAX*(int64_t)v)/HALF;
+#else
+    return (INT_MAX*((int64_t)v-HALFT))/HALF;
+#endif
+}
+
+static IN_T inline glue(clip_,IN_T) (int64_t v)
+{
+    if (v >= INT_MAX)
+        return IN_MAX;
+    else if (v < -INT_MAX)
+        return IN_MIN;
+
+#ifdef SIGNED
+    return (IN_T) (v*HALF/INT_MAX);
+#else
+    return (IN_T) (v+INT_MAX/2)*HALF/INT_MAX;
+#endif
+}
+
+static void glue(glue(conv_,IN_T),_to_stereo) (void *dst, const void *src,
+                                               int samples)
+{
+    st_sample_t *out = (st_sample_t *) dst;
+    IN_T *in = (IN_T *) src;
+    while (samples--) {
+        out->l = glue(conv_,IN_T) (*in++);
+        out->r = glue(conv_,IN_T) (*in++);
+        out += 1;
+    }
+}
+
+static void glue(glue(conv_,IN_T),_to_mono) (void *dst, const void *src,
+                                             int samples)
+{
+    st_sample_t *out = (st_sample_t *) dst;
+    IN_T *in = (IN_T *) src;
+    while (samples--) {
+        out->l = glue(conv_,IN_T) (in[0]);
+        out->r = out->l;
+        out += 1;
+        in += 1;
+    }
+}
+
+static void glue(glue(clip_,IN_T),_from_stereo) (void *dst, const void *src,
+                                                 int samples)
+{
+    st_sample_t *in = (st_sample_t *) src;
+    IN_T *out = (IN_T *) dst;
+    while (samples--) {
+        *out++ = glue(clip_,IN_T) (in->l);
+        *out++ = glue(clip_,IN_T) (in->r);
+        in += 1;
+    }
+}
+
+static void glue(glue(clip_,IN_T),_from_mono) (void *dst, const void *src,
+                                               int samples)
+{
+    st_sample_t *in = (st_sample_t *) src;
+    IN_T *out = (IN_T *) dst;
+    while (samples--) {
+        *out++ = glue(clip_,IN_T) (in->l + in->r);
+        in += 1;
+    }
+}
+
+#undef HALF
+#undef HALFT
+