audio: allow returning an error from the driver init

An error is already printed by audio_driver_init, but we can make
it more precise if the driver can return an Error *.

Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

audio/alsaaudio.c

@@ -904,7 +904,7 @@ static void alsa_init_per_direction(AudiodevAlsaPerDirectionOptions *apdo)
     }
 }
 
-static void *alsa_audio_init(Audiodev *dev)
+static void *alsa_audio_init(Audiodev *dev, Error **errp)
 {
     AudiodevAlsaOptions *aopts;
     assert(dev->driver == AUDIODEV_DRIVER_ALSA);

audio/audio.c

@@ -33,6 +33,7 @@
 #include "qapi/qapi-visit-audio.h"
 #include "qapi/qapi-commands-audio.h"
 #include "qemu/cutils.h"
+#include "qemu/error-report.h"
 #include "qemu/log.h"
 #include "qemu/module.h"
 #include "qemu/help_option.h"
@@ -1555,7 +1556,9 @@ size_t audio_generic_read(HWVoiceIn *hw, void *buf, size_t size)
 static int audio_driver_init(AudioState *s, struct audio_driver *drv,
                              bool msg, Audiodev *dev)
 {
-    s->drv_opaque = drv->init(dev);
+    Error *local_err = NULL;
+
+    s->drv_opaque = drv->init(dev, &local_err);
 
     if (s->drv_opaque) {
         if (!drv->pcm_ops->get_buffer_in) {
@@ -1572,8 +1575,12 @@ static int audio_driver_init(AudioState *s, struct audio_driver *drv,
         s->drv = drv;
         return 0;
     } else {
-        if (msg) {
-            dolog("Could not init `%s' audio driver\n", drv->name);
+        if (!msg) {
+            error_free(local_err);
+        } else if (local_err) {
+            error_report_err(local_err);
+        } else {
+            error_report("Could not init `%s' audio driver", drv->name);
         }
         return -1;
     }

audio/audio_int.h

@@ -140,7 +140,7 @@ typedef struct audio_driver audio_driver;
 struct audio_driver {
     const char *name;
     const char *descr;
-    void *(*init) (Audiodev *);
+    void *(*init) (Audiodev *, Error **);
     void (*fini) (void *);
 #ifdef CONFIG_GIO
     void (*set_dbus_server) (AudioState *s, GDBusObjectManagerServer *manager, bool p2p);

audio/coreaudio.m

@@ -644,7 +644,7 @@ static void coreaudio_enable_out(HWVoiceOut *hw, bool enable)
     update_device_playback_state(core);
 }
 
-static void *coreaudio_audio_init(Audiodev *dev)
+static void *coreaudio_audio_init(Audiodev *dev, Error **errp)
 {
     return dev;
 }

audio/dbusaudio.c

@@ -395,7 +395,7 @@ dbus_enable_in(HWVoiceIn *hw, bool enable)
 }
 
 static void *
-dbus_audio_init(Audiodev *dev)
+dbus_audio_init(Audiodev *dev, Error **errp)
 {
     DBusAudio *da = g_new0(DBusAudio, 1);
 

audio/dsoundaudio.c

@@ -619,7 +619,7 @@ static void dsound_audio_fini (void *opaque)
     g_free(s);
 }
 
-static void *dsound_audio_init(Audiodev *dev)
+static void *dsound_audio_init(Audiodev *dev, Error **errp)
 {
     int err;
     HRESULT hr;

audio/jackaudio.c

@@ -645,7 +645,7 @@ static int qjack_thread_creator(jack_native_thread_t *thread,
 }
 #endif
 
-static void *qjack_init(Audiodev *dev)
+static void *qjack_init(Audiodev *dev, Error **errp)
 {
     assert(dev->driver == AUDIODEV_DRIVER_JACK);
     return dev;

audio/noaudio.c

@@ -104,7 +104,7 @@ static void no_enable_in(HWVoiceIn *hw, bool enable)
     }
 }
 
-static void *no_audio_init(Audiodev *dev)
+static void *no_audio_init(Audiodev *dev, Error **errp)
 {
     return &no_audio_init;
 }

audio/ossaudio.c

@@ -28,6 +28,7 @@
 #include "qemu/main-loop.h"
 #include "qemu/module.h"
 #include "qemu/host-utils.h"
+#include "qapi/error.h"
 #include "audio.h"
 #include "trace.h"
 
@@ -736,7 +737,7 @@ static void oss_init_per_direction(AudiodevOssPerDirectionOptions *opdo)
     }
 }
 
-static void *oss_audio_init(Audiodev *dev)
+static void *oss_audio_init(Audiodev *dev, Error **errp)
 {
     AudiodevOssOptions *oopts;
     assert(dev->driver == AUDIODEV_DRIVER_OSS);
@@ -745,8 +746,12 @@ static void *oss_audio_init(Audiodev *dev)
     oss_init_per_direction(oopts->in);
     oss_init_per_direction(oopts->out);
 
-    if (access(oopts->in->dev ?: "/dev/dsp", R_OK | W_OK) < 0 ||
-        access(oopts->out->dev ?: "/dev/dsp", R_OK | W_OK) < 0) {
+    if (access(oopts->in->dev ?: "/dev/dsp", R_OK | W_OK) < 0) {
+        error_setg_errno(errp, errno, "%s not accessible", oopts->in->dev ?: "/dev/dsp");
+        return NULL;
+    }
+    if (access(oopts->out->dev ?: "/dev/dsp", R_OK | W_OK) < 0) {
+        error_setg_errno(errp, errno, "%s not accessible", oopts->out->dev ?: "/dev/dsp");
         return NULL;
     }
     return dev;

audio/paaudio.c

@@ -3,7 +3,7 @@
 #include "qemu/osdep.h"
 #include "qemu/module.h"
 #include "audio.h"
-#include "qapi/opts-visitor.h"
+#include "qapi/error.h"
 
 #include <pulse/pulseaudio.h>
 
@@ -818,7 +818,7 @@ fail:
     return NULL;
 }
 
-static void *qpa_audio_init(Audiodev *dev)
+static void *qpa_audio_init(Audiodev *dev, Error **errp)
 {
     paaudio *g;
     AudiodevPaOptions *popts = &dev->u.pa;
@@ -834,10 +834,12 @@ static void *qpa_audio_init(Audiodev *dev)
 
         runtime = getenv("XDG_RUNTIME_DIR");
         if (!runtime) {
+            error_setg(errp, "XDG_RUNTIME_DIR not set");
             return NULL;
         }
         snprintf(pidfile, sizeof(pidfile), "%s/pulse/pid", runtime);
         if (stat(pidfile, &st) != 0) {
+            error_setg_errno(errp, errno, "could not stat pidfile %s", pidfile);
             return NULL;
         }
     }
@@ -867,6 +869,7 @@ static void *qpa_audio_init(Audiodev *dev)
     }
     if (!g->conn) {
         g_free(g);
+        error_setg(errp, "could not connect to PulseAudio server");
         return NULL;
     }
 

audio/pwaudio.c

@@ -13,6 +13,7 @@
 #include "audio.h"
 #include <errno.h>
 #include "qemu/error-report.h"
+#include "qapi/error.h"
 #include <spa/param/audio/format-utils.h>
 #include <spa/utils/ringbuffer.h>
 #include <spa/utils/result.h>
@@ -736,7 +737,7 @@ static const struct pw_core_events core_events = {
 };
 
 static void *
-qpw_audio_init(Audiodev *dev)
+qpw_audio_init(Audiodev *dev, Error **errp)
 {
     g_autofree pwaudio *pw = g_new0(pwaudio, 1);
 
@@ -748,19 +749,19 @@ qpw_audio_init(Audiodev *dev)
     pw->dev = dev;
     pw->thread_loop = pw_thread_loop_new("PipeWire thread loop", NULL);
     if (pw->thread_loop == NULL) {
-        error_report("Could not create PipeWire loop: %s", g_strerror(errno));
+        error_setg_errno(errp, errno, "Could not create PipeWire loop");
         goto fail;
     }
 
     pw->context =
         pw_context_new(pw_thread_loop_get_loop(pw->thread_loop), NULL, 0);
     if (pw->context == NULL) {
-        error_report("Could not create PipeWire context: %s", g_strerror(errno));
+        error_setg_errno(errp, errno, "Could not create PipeWire context");
         goto fail;
     }
 
     if (pw_thread_loop_start(pw->thread_loop) < 0) {
-        error_report("Could not start PipeWire loop: %s", g_strerror(errno));
+        error_setg_errno(errp, errno, "Could not start PipeWire loop");
         goto fail;
     }
 
@@ -769,13 +770,13 @@ qpw_audio_init(Audiodev *dev)
     pw->core = pw_context_connect(pw->context, NULL, 0);
     if (pw->core == NULL) {
         pw_thread_loop_unlock(pw->thread_loop);
-        goto fail;
+        goto fail_error;
     }
 
     if (pw_core_add_listener(pw->core, &pw->core_listener,
                              &core_events, pw) < 0) {
         pw_thread_loop_unlock(pw->thread_loop);
-        goto fail;
+        goto fail_error;
     }
     if (wait_resync(pw) < 0) {
         pw_thread_loop_unlock(pw->thread_loop);
@@ -785,8 +786,9 @@ qpw_audio_init(Audiodev *dev)
 
     return g_steal_pointer(&pw);
 
+fail_error:
+    error_setg(errp, "Failed to initialize PW context");
 fail:
-    AUD_log(AUDIO_CAP, "Failed to initialize PW context");
     if (pw->thread_loop) {
         pw_thread_loop_stop(pw->thread_loop);
     }

audio/sdlaudio.c

@@ -26,6 +26,7 @@
 #include <SDL.h>
 #include <SDL_thread.h>
 #include "qemu/module.h"
+#include "qapi/error.h"
 #include "audio.h"
 
 #ifndef _WIN32
@@ -449,10 +450,10 @@ static void sdl_enable_in(HWVoiceIn *hw, bool enable)
     SDL_PauseAudioDevice(sdl->devid, !enable);
 }
 
-static void *sdl_audio_init(Audiodev *dev)
+static void *sdl_audio_init(Audiodev *dev, Error **errp)
 {
     if (SDL_InitSubSystem (SDL_INIT_AUDIO)) {
-        sdl_logerr ("SDL failed to initialize audio subsystem\n");
+        error_setg(errp, "SDL failed to initialize audio subsystem");
         return NULL;
     }
 

audio/sndioaudio.c

@@ -518,7 +518,7 @@ static void sndio_fini_in(HWVoiceIn *hw)
     sndio_fini(self);
 }
 
-static void *sndio_audio_init(Audiodev *dev)
+static void *sndio_audio_init(Audiodev *dev, Error **errp)
 {
     assert(dev->driver == AUDIODEV_DRIVER_SNDIO);
     return dev;

audio/spiceaudio.c

@@ -22,6 +22,7 @@
 #include "qemu/module.h"
 #include "qemu/error-report.h"
 #include "qemu/timer.h"
+#include "qapi/error.h"
 #include "ui/qemu-spice.h"
 
 #define AUDIO_CAP "spice"
@@ -71,11 +72,13 @@ static const SpiceRecordInterface record_sif = {
     .base.minor_version = SPICE_INTERFACE_RECORD_MINOR,
 };
 
-static void *spice_audio_init(Audiodev *dev)
+static void *spice_audio_init(Audiodev *dev, Error **errp)
 {
     if (!using_spice) {
+        error_setg(errp, "Cannot use spice audio without -spice");
         return NULL;
     }
+
     return &spice_audio_init;
 }
 

audio/wavaudio.c

@@ -182,7 +182,7 @@ static void wav_enable_out(HWVoiceOut *hw, bool enable)
     }
 }
 
-static void *wav_audio_init(Audiodev *dev)
+static void *wav_audio_init(Audiodev *dev, Error **errp)
 {
     assert(dev->driver == AUDIODEV_DRIVER_WAV);
     return dev;