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, 470 insertions, 0 deletions

diff --git a/audio/mixeng.c b/audio/mixeng.c
new file mode 100644
index 000000000..f27deb165
--- /dev/null
+++ b/audio/mixeng.c
@@ -0,0 +1,470 @@
+/*
+ * QEMU Mixing engine
+ *
+ * Copyright (c) 2004-2005 Vassili Karpov (malc)
+ * Copyright (c) 1998 Fabrice Bellard
+ *
+ * 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.
+ */
+#include "qemu/osdep.h"
+#include "qemu/bswap.h"
+#include "qemu/error-report.h"
+#include "audio.h"
+
+#define AUDIO_CAP "mixeng"
+#include "audio_int.h"
+
+/* 8 bit */
+#define ENDIAN_CONVERSION natural
+#define ENDIAN_CONVERT(v) (v)
+
+/* Signed 8 bit */
+#define BSIZE 8
+#define ITYPE int
+#define IN_MIN SCHAR_MIN
+#define IN_MAX SCHAR_MAX
+#define SIGNED
+#define SHIFT 8
+#include "mixeng_template.h"
+#undef SIGNED
+#undef IN_MAX
+#undef IN_MIN
+#undef BSIZE
+#undef ITYPE
+#undef SHIFT
+
+/* Unsigned 8 bit */
+#define BSIZE 8
+#define ITYPE uint
+#define IN_MIN 0
+#define IN_MAX UCHAR_MAX
+#define SHIFT 8
+#include "mixeng_template.h"
+#undef IN_MAX
+#undef IN_MIN
+#undef BSIZE
+#undef ITYPE
+#undef SHIFT
+
+#undef ENDIAN_CONVERT
+#undef ENDIAN_CONVERSION
+
+/* Signed 16 bit */
+#define BSIZE 16
+#define ITYPE int
+#define IN_MIN SHRT_MIN
+#define IN_MAX SHRT_MAX
+#define SIGNED
+#define SHIFT 16
+#define ENDIAN_CONVERSION natural
+#define ENDIAN_CONVERT(v) (v)
+#include "mixeng_template.h"
+#undef ENDIAN_CONVERT
+#undef ENDIAN_CONVERSION
+#define ENDIAN_CONVERSION swap
+#define ENDIAN_CONVERT(v) bswap16 (v)
+#include "mixeng_template.h"
+#undef ENDIAN_CONVERT
+#undef ENDIAN_CONVERSION
+#undef SIGNED
+#undef IN_MAX
+#undef IN_MIN
+#undef BSIZE
+#undef ITYPE
+#undef SHIFT
+
+/* Unsigned 16 bit */
+#define BSIZE 16
+#define ITYPE uint
+#define IN_MIN 0
+#define IN_MAX USHRT_MAX
+#define SHIFT 16
+#define ENDIAN_CONVERSION natural
+#define ENDIAN_CONVERT(v) (v)
+#include "mixeng_template.h"
+#undef ENDIAN_CONVERT
+#undef ENDIAN_CONVERSION
+#define ENDIAN_CONVERSION swap
+#define ENDIAN_CONVERT(v) bswap16 (v)
+#include "mixeng_template.h"
+#undef ENDIAN_CONVERT
+#undef ENDIAN_CONVERSION
+#undef IN_MAX
+#undef IN_MIN
+#undef BSIZE
+#undef ITYPE
+#undef SHIFT
+
+/* Signed 32 bit */
+#define BSIZE 32
+#define ITYPE int
+#define IN_MIN INT32_MIN
+#define IN_MAX INT32_MAX
+#define SIGNED
+#define SHIFT 32
+#define ENDIAN_CONVERSION natural
+#define ENDIAN_CONVERT(v) (v)
+#include "mixeng_template.h"
+#undef ENDIAN_CONVERT
+#undef ENDIAN_CONVERSION
+#define ENDIAN_CONVERSION swap
+#define ENDIAN_CONVERT(v) bswap32 (v)
+#include "mixeng_template.h"
+#undef ENDIAN_CONVERT
+#undef ENDIAN_CONVERSION
+#undef SIGNED
+#undef IN_MAX
+#undef IN_MIN
+#undef BSIZE
+#undef ITYPE
+#undef SHIFT
+
+/* Unsigned 32 bit */
+#define BSIZE 32
+#define ITYPE uint
+#define IN_MIN 0
+#define IN_MAX UINT32_MAX
+#define SHIFT 32
+#define ENDIAN_CONVERSION natural
+#define ENDIAN_CONVERT(v) (v)
+#include "mixeng_template.h"
+#undef ENDIAN_CONVERT
+#undef ENDIAN_CONVERSION
+#define ENDIAN_CONVERSION swap
+#define ENDIAN_CONVERT(v) bswap32 (v)
+#include "mixeng_template.h"
+#undef ENDIAN_CONVERT
+#undef ENDIAN_CONVERSION
+#undef IN_MAX
+#undef IN_MIN
+#undef BSIZE
+#undef ITYPE
+#undef SHIFT
+
+t_sample *mixeng_conv[2][2][2][3] = {
+    {
+        {
+            {
+                conv_natural_uint8_t_to_mono,
+                conv_natural_uint16_t_to_mono,
+                conv_natural_uint32_t_to_mono
+            },
+            {
+                conv_natural_uint8_t_to_mono,
+                conv_swap_uint16_t_to_mono,
+                conv_swap_uint32_t_to_mono,
+            }
+        },
+        {
+            {
+                conv_natural_int8_t_to_mono,
+                conv_natural_int16_t_to_mono,
+                conv_natural_int32_t_to_mono
+            },
+            {
+                conv_natural_int8_t_to_mono,
+                conv_swap_int16_t_to_mono,
+                conv_swap_int32_t_to_mono
+            }
+        }
+    },
+    {
+        {
+            {
+                conv_natural_uint8_t_to_stereo,
+                conv_natural_uint16_t_to_stereo,
+                conv_natural_uint32_t_to_stereo
+            },
+            {
+                conv_natural_uint8_t_to_stereo,
+                conv_swap_uint16_t_to_stereo,
+                conv_swap_uint32_t_to_stereo
+            }
+        },
+        {
+            {
+                conv_natural_int8_t_to_stereo,
+                conv_natural_int16_t_to_stereo,
+                conv_natural_int32_t_to_stereo
+            },
+            {
+                conv_natural_int8_t_to_stereo,
+                conv_swap_int16_t_to_stereo,
+                conv_swap_int32_t_to_stereo,
+            }
+        }
+    }
+};
+
+f_sample *mixeng_clip[2][2][2][3] = {
+    {
+        {
+            {
+                clip_natural_uint8_t_from_mono,
+                clip_natural_uint16_t_from_mono,
+                clip_natural_uint32_t_from_mono
+            },
+            {
+                clip_natural_uint8_t_from_mono,
+                clip_swap_uint16_t_from_mono,
+                clip_swap_uint32_t_from_mono
+            }
+        },
+        {
+            {
+                clip_natural_int8_t_from_mono,
+                clip_natural_int16_t_from_mono,
+                clip_natural_int32_t_from_mono
+            },
+            {
+                clip_natural_int8_t_from_mono,
+                clip_swap_int16_t_from_mono,
+                clip_swap_int32_t_from_mono
+            }
+        }
+    },
+    {
+        {
+            {
+                clip_natural_uint8_t_from_stereo,
+                clip_natural_uint16_t_from_stereo,
+                clip_natural_uint32_t_from_stereo
+            },
+            {
+                clip_natural_uint8_t_from_stereo,
+                clip_swap_uint16_t_from_stereo,
+                clip_swap_uint32_t_from_stereo
+            }
+        },
+        {
+            {
+                clip_natural_int8_t_from_stereo,
+                clip_natural_int16_t_from_stereo,
+                clip_natural_int32_t_from_stereo
+            },
+            {
+                clip_natural_int8_t_from_stereo,
+                clip_swap_int16_t_from_stereo,
+                clip_swap_int32_t_from_stereo
+            }
+        }
+    }
+};
+
+#ifdef FLOAT_MIXENG
+#define CONV_NATURAL_FLOAT(x) (x)
+#define CLIP_NATURAL_FLOAT(x) (x)
+#else
+/* macros to map [-1.f, 1.f] <-> [INT32_MIN, INT32_MAX + 1] */
+static const float float_scale = (int64_t)INT32_MAX + 1;
+#define CONV_NATURAL_FLOAT(x) ((x) * float_scale)
+
+#ifdef RECIPROCAL
+static const float float_scale_reciprocal = 1.f / ((int64_t)INT32_MAX + 1);
+#define CLIP_NATURAL_FLOAT(x) ((x) * float_scale_reciprocal)
+#else
+#define CLIP_NATURAL_FLOAT(x) ((x) / float_scale)
+#endif
+#endif
+
+static void conv_natural_float_to_mono(struct st_sample *dst, const void *src,
+                                       int samples)
+{
+    float *in = (float *)src;
+
+    while (samples--) {
+        dst->r = dst->l = CONV_NATURAL_FLOAT(*in++);
+        dst++;
+    }
+}
+
+static void conv_natural_float_to_stereo(struct st_sample *dst, const void *src,
+                                         int samples)
+{
+    float *in = (float *)src;
+
+    while (samples--) {
+        dst->l = CONV_NATURAL_FLOAT(*in++);
+        dst->r = CONV_NATURAL_FLOAT(*in++);
+        dst++;
+    }
+}
+
+t_sample *mixeng_conv_float[2] = {
+    conv_natural_float_to_mono,
+    conv_natural_float_to_stereo,
+};
+
+static void clip_natural_float_from_mono(void *dst, const struct st_sample *src,
+                                         int samples)
+{
+    float *out = (float *)dst;
+
+    while (samples--) {
+        *out++ = CLIP_NATURAL_FLOAT(src->l + src->r);
+        src++;
+    }
+}
+
+static void clip_natural_float_from_stereo(
+    void *dst, const struct st_sample *src, int samples)
+{
+    float *out = (float *)dst;
+
+    while (samples--) {
+        *out++ = CLIP_NATURAL_FLOAT(src->l);
+        *out++ = CLIP_NATURAL_FLOAT(src->r);
+        src++;
+    }
+}
+
+f_sample *mixeng_clip_float[2] = {
+    clip_natural_float_from_mono,
+    clip_natural_float_from_stereo,
+};
+
+void audio_sample_to_uint64(const void *samples, int pos,
+                            uint64_t *left, uint64_t *right)
+{
+    const struct st_sample *sample = samples;
+    sample += pos;
+#ifdef FLOAT_MIXENG
+    error_report(
+        "Coreaudio and floating point samples are not supported by replay yet");
+    abort();
+#else
+    *left = sample->l;
+    *right = sample->r;
+#endif
+}
+
+void audio_sample_from_uint64(void *samples, int pos,
+                            uint64_t left, uint64_t right)
+{
+    struct st_sample *sample = samples;
+    sample += pos;
+#ifdef FLOAT_MIXENG
+    error_report(
+        "Coreaudio and floating point samples are not supported by replay yet");
+    abort();
+#else
+    sample->l = left;
+    sample->r = right;
+#endif
+}
+
+/*
+ * August 21, 1998
+ * Copyright 1998 Fabrice Bellard.
+ *
+ * [Rewrote completely the code of Lance Norskog And Sundry
+ * Contributors with a more efficient algorithm.]
+ *
+ * This source code is freely redistributable and may be used for
+ * any purpose.  This copyright notice must be maintained.
+ * Lance Norskog And Sundry Contributors are not responsible for
+ * the consequences of using this software.
+ */
+
+/*
+ * Sound Tools rate change effect file.
+ */
+/*
+ * Linear Interpolation.
+ *
+ * The use of fractional increment allows us to use no buffer. It
+ * avoid the problems at the end of the buffer we had with the old
+ * method which stored a possibly big buffer of size
+ * lcm(in_rate,out_rate).
+ *
+ * Limited to 16 bit samples and sampling frequency <= 65535 Hz. If
+ * the input & output frequencies are equal, a delay of one sample is
+ * introduced.  Limited to processing 32-bit count worth of samples.
+ *
+ * 1 << FRAC_BITS evaluating to zero in several places.  Changed with
+ * an (unsigned long) cast to make it safe.  MarkMLl 2/1/99
+ */
+
+/* Private data */
+struct rate {
+    uint64_t opos;
+    uint64_t opos_inc;
+    uint32_t ipos;              /* position in the input stream (integer) */
+    struct st_sample ilast;          /* last sample in the input stream */
+};
+
+/*
+ * Prepare processing.
+ */
+void *st_rate_start (int inrate, int outrate)
+{
+    struct rate *rate = audio_calloc(__func__, 1, sizeof(*rate));
+
+    if (!rate) {
+        dolog ("Could not allocate resampler (%zu bytes)\n", sizeof (*rate));
+        return NULL;
+    }
+
+    rate->opos = 0;
+
+    /* increment */
+    rate->opos_inc = ((uint64_t) inrate << 32) / outrate;
+
+    rate->ipos = 0;
+    rate->ilast.l = 0;
+    rate->ilast.r = 0;
+    return rate;
+}
+
+#define NAME st_rate_flow_mix
+#define OP(a, b) a += b
+#include "rate_template.h"
+
+#define NAME st_rate_flow
+#define OP(a, b) a = b
+#include "rate_template.h"
+
+void st_rate_stop (void *opaque)
+{
+    g_free (opaque);
+}
+
+void mixeng_clear (struct st_sample *buf, int len)
+{
+    memset (buf, 0, len * sizeof (struct st_sample));
+}
+
+void mixeng_volume (struct st_sample *buf, int len, struct mixeng_volume *vol)
+{
+    if (vol->mute) {
+        mixeng_clear (buf, len);
+        return;
+    }
+
+    while (len--) {
+#ifdef FLOAT_MIXENG
+        buf->l = buf->l * vol->l;
+        buf->r = buf->r * vol->r;
+#else
+        buf->l = (buf->l * vol->l) >> 32;
+        buf->r = (buf->r * vol->r) >> 32;
+#endif
+        buf += 1;
+    }
+}