[PATCH v5 04/10] hw/audio/virtio-sound: allocate an array of streams

[Alexander Mikhalitsyn <alexander@mihalicyn.com>]

From: Volker Rümelin <vr_qemu@t-online.de>

It is much easier to migrate an array of structs than individual
structs that are accessed via a pointer to a pointer to an array
of pointers to struct.

For this reason, allocate an array of streams in
virtio_snd_realize() and initialise all stream variables that
are constant at runtime immediately after allocation.

This makes it easier to remove the virtio_snd_set_pcm_params()
and virtio_snd_pcm_prepare() calls in the realisation phase and
to migrate the audio streams of the virtio sound device after
the next few patches.

Signed-off-by: Volker Rümelin <vr_qemu@t-online.de>
[AM: there were too many conflicts, I did `git checkout --ours -- <.>`
     and then reimplemented the patch idea
/AM]
Signed-off-by: Alexander Mikhalitsyn <aleksandr.mikhalitsyn@futurfusion.io>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
---
v4:
	- fixed stream->info.channels_max value
	  (problem was noticed by Manos Pitsidianakis)
v3:
	As suggested by Marc-André Lureau:
	- drop VirtIOSoundPCMStream's id field
---
 hw/audio/virtio-snd.c         | 33 +++++++++++++++++++++------------
 include/hw/audio/virtio-snd.h |  2 +-
 2 files changed, 22 insertions(+), 13 deletions(-)

diff --git a/hw/audio/virtio-snd.c b/hw/audio/virtio-snd.c
index cbf739f8a7d..84083be8825 100644
--- a/hw/audio/virtio-snd.c
+++ b/hw/audio/virtio-snd.c
@@ -436,12 +436,9 @@ static uint32_t virtio_snd_pcm_prepare(VirtIOSound *s, uint32_t stream_id)
 
     stream = virtio_snd_pcm_get_stream(s, stream_id);
     if (stream == NULL) {
-        stream = g_new0(VirtIOSoundPCMStream, 1);
+        stream = &s->streams[stream_id];
         stream->active = false;
-        stream->id = stream_id;
-        stream->s = s;
         stream->latency_bytes = 0;
-        QSIMPLEQ_INIT(&stream->queue);
 
         /*
          * stream_id >= s->snd_conf.streams was checked before so this is
@@ -451,14 +448,7 @@ static uint32_t virtio_snd_pcm_prepare(VirtIOSound *s, uint32_t stream_id)
     }
 
     virtio_snd_get_qemu_audsettings(&as, params);
-    stream->info.direction = stream_id < s->snd_conf.streams / 2 +
-        (s->snd_conf.streams & 1) ? VIRTIO_SND_D_OUTPUT : VIRTIO_SND_D_INPUT;
-    stream->info.hdr.hda_fn_nid = VIRTIO_SOUND_HDA_FN_NID;
-    stream->info.features = 0;
-    stream->info.channels_min = 1;
     stream->info.channels_max = as.nchannels;
-    stream->info.formats = supported_formats;
-    stream->info.rates = supported_rates;
     stream->params = *params;
 
     stream->as = as;
@@ -1056,6 +1046,24 @@ static void virtio_snd_realize(DeviceState *dev, Error **errp)
     vsnd->vmstate =
         qemu_add_vm_change_state_handler(virtio_snd_vm_state_change, vsnd);
 
+    vsnd->streams = g_new0(VirtIOSoundPCMStream, vsnd->snd_conf.streams);
+
+    for (uint32_t i = 0; i < vsnd->snd_conf.streams; i++) {
+        VirtIOSoundPCMStream *stream = &vsnd->streams[i];
+
+        stream->s = vsnd;
+        QSIMPLEQ_INIT(&stream->queue);
+        stream->info.hdr.hda_fn_nid = VIRTIO_SOUND_HDA_FN_NID;
+        stream->info.features = 0;
+        stream->info.formats = supported_formats;
+        stream->info.rates = supported_rates;
+        stream->info.direction =
+            i < vsnd->snd_conf.streams / 2 + (vsnd->snd_conf.streams & 1)
+            ? VIRTIO_SND_D_OUTPUT : VIRTIO_SND_D_INPUT;
+        stream->info.channels_min = 1;
+        stream->info.channels_max = 2;
+    }
+
     vsnd->pcm.streams =
         g_new0(VirtIOSoundPCMStream *, vsnd->snd_conf.streams);
     vsnd->pcm.pcm_params =
@@ -1324,12 +1332,13 @@ static void virtio_snd_unrealize(DeviceState *dev)
             if (stream) {
                 virtio_snd_process_cmdq(stream->s);
                 virtio_snd_pcm_close(stream);
-                g_free(stream);
             }
         }
         g_free(vsnd->pcm.streams);
     }
     g_free(vsnd->pcm.pcm_params);
+    g_free(vsnd->streams);
+    vsnd->streams = NULL;
     virtio_delete_queue(vsnd->queues[VIRTIO_SND_VQ_CONTROL]);
     virtio_delete_queue(vsnd->queues[VIRTIO_SND_VQ_EVENT]);
     virtio_delete_queue(vsnd->queues[VIRTIO_SND_VQ_TX]);
diff --git a/include/hw/audio/virtio-snd.h b/include/hw/audio/virtio-snd.h
index 884c475ffd9..97ffaae18be 100644
--- a/include/hw/audio/virtio-snd.h
+++ b/include/hw/audio/virtio-snd.h
@@ -136,7 +136,6 @@ struct VirtIOSoundPCM {
 struct VirtIOSoundPCMStream {
     virtio_snd_pcm_info info;
     virtio_snd_pcm_set_params params;
-    uint32_t id;
     VirtIOSound *s;
     audsettings as;
     union {
@@ -211,6 +210,7 @@ struct VirtIOSound {
     VirtQueue *queues[VIRTIO_SND_VQ_MAX];
     uint64_t features;
     VirtIOSoundPCM pcm;
+    VirtIOSoundPCMStream *streams;
     AudioBackend *audio_be;
     VMChangeStateEntry *vmstate;
     virtio_snd_config snd_conf;
-- 
2.47.3