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, 221 insertions, 0 deletions

diff --git a/audio/wavaudio.c b/audio/wavaudio.c
new file mode 100644
index 000000000..20e6853f8
--- /dev/null
+++ b/audio/wavaudio.c
@@ -0,0 +1,221 @@
+/*
+ * QEMU WAV audio driver
+ *
+ * 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.
+ */
+
+#include "qemu/osdep.h"
+#include "qemu/host-utils.h"
+#include "qemu/module.h"
+#include "qemu/timer.h"
+#include "qapi/opts-visitor.h"
+#include "audio.h"
+
+#define AUDIO_CAP "wav"
+#include "audio_int.h"
+
+typedef struct WAVVoiceOut {
+    HWVoiceOut hw;
+    FILE *f;
+    RateCtl rate;
+    int total_samples;
+} WAVVoiceOut;
+
+static size_t wav_write_out(HWVoiceOut *hw, void *buf, size_t len)
+{
+    WAVVoiceOut *wav = (WAVVoiceOut *) hw;
+    int64_t bytes = audio_rate_get_bytes(&hw->info, &wav->rate, len);
+    assert(bytes % hw->info.bytes_per_frame == 0);
+
+    if (bytes && fwrite(buf, bytes, 1, wav->f) != 1) {
+        dolog("wav_write_out: fwrite of %" PRId64 " bytes failed\nReason: %s\n",
+              bytes, strerror(errno));
+    }
+
+    wav->total_samples += bytes / hw->info.bytes_per_frame;
+    return bytes;
+}
+
+/* VICE code: Store number as little endian. */
+static void le_store (uint8_t *buf, uint32_t val, int len)
+{
+    int i;
+    for (i = 0; i < len; i++) {
+        buf[i] = (uint8_t) (val & 0xff);
+        val >>= 8;
+    }
+}
+
+static int wav_init_out(HWVoiceOut *hw, struct audsettings *as,
+                        void *drv_opaque)
+{
+    WAVVoiceOut *wav = (WAVVoiceOut *) hw;
+    int bits16 = 0, stereo = 0;
+    uint8_t hdr[] = {
+        0x52, 0x49, 0x46, 0x46, 0x00, 0x00, 0x00, 0x00, 0x57, 0x41, 0x56,
+        0x45, 0x66, 0x6d, 0x74, 0x20, 0x10, 0x00, 0x00, 0x00, 0x01, 0x00,
+        0x02, 0x00, 0x44, 0xac, 0x00, 0x00, 0x10, 0xb1, 0x02, 0x00, 0x04,
+        0x00, 0x10, 0x00, 0x64, 0x61, 0x74, 0x61, 0x00, 0x00, 0x00, 0x00
+    };
+    Audiodev *dev = drv_opaque;
+    AudiodevWavOptions *wopts = &dev->u.wav;
+    struct audsettings wav_as = audiodev_to_audsettings(dev->u.wav.out);
+    const char *wav_path = wopts->has_path ? wopts->path : "qemu.wav";
+
+    stereo = wav_as.nchannels == 2;
+    switch (wav_as.fmt) {
+    case AUDIO_FORMAT_S8:
+    case AUDIO_FORMAT_U8:
+        bits16 = 0;
+        break;
+
+    case AUDIO_FORMAT_S16:
+    case AUDIO_FORMAT_U16:
+        bits16 = 1;
+        break;
+
+    case AUDIO_FORMAT_S32:
+    case AUDIO_FORMAT_U32:
+        dolog ("WAVE files can not handle 32bit formats\n");
+        return -1;
+
+    default:
+        abort();
+    }
+
+    hdr[34] = bits16 ? 0x10 : 0x08;
+
+    wav_as.endianness = 0;
+    audio_pcm_init_info (&hw->info, &wav_as);
+
+    hw->samples = 1024;
+    le_store (hdr + 22, hw->info.nchannels, 2);
+    le_store (hdr + 24, hw->info.freq, 4);
+    le_store (hdr + 28, hw->info.freq << (bits16 + stereo), 4);
+    le_store (hdr + 32, 1 << (bits16 + stereo), 2);
+
+    wav->f = fopen(wav_path, "wb");
+    if (!wav->f) {
+        dolog ("Failed to open wave file `%s'\nReason: %s\n",
+               wav_path, strerror(errno));
+        return -1;
+    }
+
+    if (fwrite (hdr, sizeof (hdr), 1, wav->f) != 1) {
+        dolog ("wav_init_out: failed to write header\nReason: %s\n",
+               strerror(errno));
+        return -1;
+    }
+
+    audio_rate_start(&wav->rate);
+    return 0;
+}
+
+static void wav_fini_out (HWVoiceOut *hw)
+{
+    WAVVoiceOut *wav = (WAVVoiceOut *) hw;
+    uint8_t rlen[4];
+    uint8_t dlen[4];
+    uint32_t datalen = wav->total_samples * hw->info.bytes_per_frame;
+    uint32_t rifflen = datalen + 36;
+
+    if (!wav->f) {
+        return;
+    }
+
+    le_store (rlen, rifflen, 4);
+    le_store (dlen, datalen, 4);
+
+    if (fseek (wav->f, 4, SEEK_SET)) {
+        dolog ("wav_fini_out: fseek to rlen failed\nReason: %s\n",
+               strerror(errno));
+        goto doclose;
+    }
+    if (fwrite (rlen, 4, 1, wav->f) != 1) {
+        dolog ("wav_fini_out: failed to write rlen\nReason: %s\n",
+               strerror (errno));
+        goto doclose;
+    }
+    if (fseek (wav->f, 32, SEEK_CUR)) {
+        dolog ("wav_fini_out: fseek to dlen failed\nReason: %s\n",
+               strerror (errno));
+        goto doclose;
+    }
+    if (fwrite (dlen, 4, 1, wav->f) != 1) {
+        dolog ("wav_fini_out: failed to write dlen\nReaons: %s\n",
+               strerror (errno));
+        goto doclose;
+    }
+
+ doclose:
+    if (fclose (wav->f))  {
+        dolog ("wav_fini_out: fclose %p failed\nReason: %s\n",
+               wav->f, strerror (errno));
+    }
+    wav->f = NULL;
+}
+
+static void wav_enable_out(HWVoiceOut *hw, bool enable)
+{
+    WAVVoiceOut *wav = (WAVVoiceOut *) hw;
+
+    if (enable) {
+        audio_rate_start(&wav->rate);
+    }
+}
+
+static void *wav_audio_init(Audiodev *dev)
+{
+    assert(dev->driver == AUDIODEV_DRIVER_WAV);
+    return dev;
+}
+
+static void wav_audio_fini (void *opaque)
+{
+    ldebug ("wav_fini");
+}
+
+static struct audio_pcm_ops wav_pcm_ops = {
+    .init_out = wav_init_out,
+    .fini_out = wav_fini_out,
+    .write    = wav_write_out,
+    .run_buffer_out = audio_generic_run_buffer_out,
+    .enable_out = wav_enable_out,
+};
+
+static struct audio_driver wav_audio_driver = {
+    .name           = "wav",
+    .descr          = "WAV renderer http://wikipedia.org/wiki/WAV",
+    .init           = wav_audio_init,
+    .fini           = wav_audio_fini,
+    .pcm_ops        = &wav_pcm_ops,
+    .can_be_default = 0,
+    .max_voices_out = 1,
+    .max_voices_in  = 0,
+    .voice_size_out = sizeof (WAVVoiceOut),
+    .voice_size_in  = 0
+};
+
+static void register_audio_wav(void)
+{
+    audio_driver_register(&wav_audio_driver);
+}
+type_init(register_audio_wav);