replay: add record/replay for audio passthrough

This patch adds recording and replaying audio data. Is saves synchronization
information for audio out and inputs from the microphone.

v2: removed unneeded whitespace change

Signed-off-by: Pavel Dovgalyuk <pavel.dovgaluk@ispras.ru>
Message-id: 20170202055054.4848.94901.stgit@PASHA-ISP.lan02.inno

[ kraxel: add qemu/error-report.h include to fix osx build failure ]

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
diff --git a/audio/mixeng.c b/audio/mixeng.c
index 66c0328..0bf9b53 100644
--- a/audio/mixeng.c
+++ b/audio/mixeng.c
@@ -25,6 +25,7 @@
 #include "qemu/osdep.h"
 #include "qemu-common.h"
 #include "qemu/bswap.h"
+#include "qemu/error-report.h"
 #include "audio.h"
 
 #define AUDIO_CAP "mixeng"
@@ -267,6 +268,37 @@
     }
 };
 
+
+void audio_sample_to_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
+    *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.