Introduce Virtio-loopback epsilon release:

Epsilon release introduces a new compatibility layer which make virtio-loopback
design to work with QEMU and rust-vmm vhost-user backend without require any
changes.

Signed-off-by: Timos Ampelikiotis <t.ampelikiotis@virtualopensystems.com>
Change-Id: I52e57563e08a7d0bdc002f8e928ee61ba0c53dd9

1 files changed, 58 insertions, 0 deletions

diff --git a/audio/mixeng.h b/audio/mixeng.h
new file mode 100644
index 000000000..2dcd6df24
--- /dev/null
+++ b/audio/mixeng.h
@@ -0,0 +1,58 @@
+/*
+ * QEMU Mixing engine header
+ *
+ * Copyright (c) 2004-2005 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.
+ */
+
+#ifndef QEMU_MIXENG_H
+#define QEMU_MIXENG_H
+
+#ifdef FLOAT_MIXENG
+typedef float mixeng_real;
+struct mixeng_volume { int mute; mixeng_real r; mixeng_real l; };
+struct st_sample { mixeng_real l; mixeng_real r; };
+#else
+struct mixeng_volume { int mute; int64_t r; int64_t l; };
+struct st_sample { int64_t l; int64_t r; };
+#endif
+typedef struct st_sample st_sample;
+
+typedef void (t_sample) (struct st_sample *dst, const void *src, int samples);
+typedef void (f_sample) (void *dst, const struct st_sample *src, int samples);
+
+/* indices: [stereo][signed][swap endiannes][8, 16 or 32-bits] */
+extern t_sample *mixeng_conv[2][2][2][3];
+extern f_sample *mixeng_clip[2][2][2][3];
+
+/* indices: [stereo] */
+extern t_sample *mixeng_conv_float[2];
+extern f_sample *mixeng_clip_float[2];
+
+void *st_rate_start (int inrate, int outrate);
+void st_rate_flow(void *opaque, st_sample *ibuf, st_sample *obuf,
+                  size_t *isamp, size_t *osamp);
+void st_rate_flow_mix(void *opaque, st_sample *ibuf, st_sample *obuf,
+                      size_t *isamp, size_t *osamp);
+void st_rate_stop (void *opaque);
+void mixeng_clear (struct st_sample *buf, int len);
+void mixeng_volume (struct st_sample *buf, int len, struct mixeng_volume *vol);
+
+#endif /* QEMU_MIXENG_H */