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>

audio/audio.c

@@ -28,6 +28,7 @@
 #include "qemu/timer.h"
 #include "sysemu/sysemu.h"
 #include "qemu/cutils.h"
+#include "sysemu/replay.h"
 
 #define AUDIO_CAP "audio"
 #include "audio_int.h"
@@ -1387,6 +1388,7 @@ static void audio_run_out (AudioState *s)
 
         prev_rpos = hw->rpos;
         played = hw->pcm_ops->run_out (hw, live);
+        replay_audio_out(&played);
         if (audio_bug (AUDIO_FUNC, hw->rpos >= hw->samples)) {
             dolog ("hw->rpos=%d hw->samples=%d played=%d\n",
                    hw->rpos, hw->samples, played);
@@ -1450,9 +1452,12 @@ static void audio_run_in (AudioState *s)
 
     while ((hw = audio_pcm_hw_find_any_enabled_in (hw))) {
         SWVoiceIn *sw;
-        int captured, min;
+        int captured = 0, min;
 
+        if (replay_mode != REPLAY_MODE_PLAY) {
             captured = hw->pcm_ops->run_in(hw);
+        }
+        replay_audio_in(&captured, hw->conv_buf, &hw->wpos, hw->samples);
 
         min = audio_pcm_hw_find_min_in (hw);
         hw->total_samples_captured += captured - min;

audio/audio.h

@@ -166,4 +166,9 @@ int wav_start_capture (CaptureState *s, const char *path, int freq,
 bool audio_is_cleaning_up(void);
 void audio_cleanup(void);
 
+void audio_sample_to_uint64(void *samples, int pos,
+                            uint64_t *left, uint64_t *right);
+void audio_sample_from_uint64(void *samples, int pos,
+                            uint64_t left, uint64_t right);
+
 #endif /* QEMU_AUDIO_H */

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 @@ f_sample *mixeng_clip[2][2][2][3] = {
     }
 };
 
+
+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.

docs/replay.txt

@@ -225,3 +225,10 @@ recording the virtual machine this filter puts all packets coming from
 the outer world into the log. In replay mode packets from the log are
 injected into the network device. All interactions with network backend
 in replay mode are disabled.
+
+Audio devices
+-------------
+
+Audio data is recorded and replay automatically. The command line for recording
+and replaying must contain identical specifications of audio hardware, e.g.:
+ -soundhw ac97

include/sysemu/replay.h

@@ -152,6 +152,13 @@ void replay_unregister_net(ReplayNetState *rns);
 void replay_net_packet_event(ReplayNetState *rns, unsigned flags,
                              const struct iovec *iov, int iovcnt);
 
+/* Audio */
+
+/*! Saves/restores number of played samples of audio out operation. */
+void replay_audio_out(int *played);
+/*! Saves/restores recorded samples of audio in operation. */
+void replay_audio_in(int *recorded, void *samples, int *wpos, int size);
+
 /* VM state operations */
 
 /*! Called at the start of execution.

replay/Makefile.objs

@@ -6,3 +6,4 @@ common-obj-y += replay-input.o
 common-obj-y += replay-char.o
 common-obj-y += replay-snapshot.o
 common-obj-y += replay-net.o
+common-obj-y += replay-audio.o

replay/replay-audio.c

@@ -0,0 +1,79 @@
+/*
+ * replay-audio.c
+ *
+ * Copyright (c) 2010-2017 Institute for System Programming
+ *                         of the Russian Academy of Sciences.
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ *
+ */
+
+#include "qemu/osdep.h"
+#include "qemu/error-report.h"
+#include "sysemu/replay.h"
+#include "replay-internal.h"
+#include "sysemu/sysemu.h"
+#include "audio/audio.h"
+
+void replay_audio_out(int *played)
+{
+    if (replay_mode == REPLAY_MODE_RECORD) {
+        replay_save_instructions();
+        replay_mutex_lock();
+        replay_put_event(EVENT_AUDIO_OUT);
+        replay_put_dword(*played);
+        replay_mutex_unlock();
+    } else if (replay_mode == REPLAY_MODE_PLAY) {
+        replay_account_executed_instructions();
+        replay_mutex_lock();
+        if (replay_next_event_is(EVENT_AUDIO_OUT)) {
+            *played = replay_get_dword();
+            replay_finish_event();
+            replay_mutex_unlock();
+        } else {
+            replay_mutex_unlock();
+            error_report("Missing audio out event in the replay log");
+            abort();
+        }
+    }
+}
+
+void replay_audio_in(int *recorded, void *samples, int *wpos, int size)
+{
+    int pos;
+    uint64_t left, right;
+    if (replay_mode == REPLAY_MODE_RECORD) {
+        replay_save_instructions();
+        replay_mutex_lock();
+        replay_put_event(EVENT_AUDIO_IN);
+        replay_put_dword(*recorded);
+        replay_put_dword(*wpos);
+        for (pos = (*wpos - *recorded + size) % size ; pos != *wpos
+             ; pos = (pos + 1) % size) {
+            audio_sample_to_uint64(samples, pos, &left, &right);
+            replay_put_qword(left);
+            replay_put_qword(right);
+        }
+        replay_mutex_unlock();
+    } else if (replay_mode == REPLAY_MODE_PLAY) {
+        replay_account_executed_instructions();
+        replay_mutex_lock();
+        if (replay_next_event_is(EVENT_AUDIO_IN)) {
+            *recorded = replay_get_dword();
+            *wpos = replay_get_dword();
+            for (pos = (*wpos - *recorded + size) % size ; pos != *wpos
+                 ; pos = (pos + 1) % size) {
+                left = replay_get_qword();
+                right = replay_get_qword();
+                audio_sample_from_uint64(samples, pos, left, right);
+            }
+            replay_finish_event();
+            replay_mutex_unlock();
+        } else {
+            replay_mutex_unlock();
+            error_report("Missing audio in event in the replay log");
+            abort();
+        }
+    }
+}

replay/replay-internal.h

@@ -29,6 +29,10 @@ enum ReplayEvents {
     /* for character device read all event */
     EVENT_CHAR_READ_ALL,
     EVENT_CHAR_READ_ALL_ERROR,
+    /* for audio out event */
+    EVENT_AUDIO_OUT,
+    /* for audio in event */
+    EVENT_AUDIO_IN,
     /* for clock read/writes */
     /* some of greater codes are reserved for clocks */
     EVENT_CLOCK,