virtio-sound: handle VIRTIO_SND_R_PCM_PREPARE

[thirdparty/qemu.git] / hw / audio / virtio-snd.c

diff --git a/hw/audio/virtio-snd.c b/hw/audio/virtio-snd.c
index 084890e52b166cd051be3a9207f4b50dcbc39ad7..31a1942754e99f703f7eb3a719b76c99e47cf1d7 100644 (file)
--- a/hw/audio/virtio-snd.c
+++ b/hw/audio/virtio-snd.c
@@ -478,6 +478,28 @@ static const char *print_code(uint32_t code)
     #undef CASE
 };
 
+/*
+ * Handles VIRTIO_SND_R_PCM_PREPARE.
+ *
+ * @s: VirtIOSound device
+ * @cmd: The request command queue element from VirtIOSound cmdq field
+ */
+static void virtio_snd_handle_pcm_prepare(VirtIOSound *s,
+                                          virtio_snd_ctrl_command *cmd)
+{
+    uint32_t stream_id;
+    size_t msg_sz = iov_to_buf(cmd->elem->out_sg,
+                               cmd->elem->out_num,
+                               sizeof(virtio_snd_hdr),
+                               &stream_id,
+                               sizeof(stream_id));
+
+    stream_id = le32_to_cpu(stream_id);
+    cmd->resp.code = msg_sz == sizeof(stream_id)
+                   ? virtio_snd_pcm_prepare(s, stream_id)
+                   : cpu_to_le32(VIRTIO_SND_S_BAD_MSG);
+}
+
 /*
  * Handles VIRTIO_SND_R_PCM_START.
  *
@@ -569,6 +591,8 @@ process_cmd(VirtIOSound *s, virtio_snd_ctrl_command *cmd)
         virtio_snd_handle_pcm_set_params(s, cmd);
         break;
     case VIRTIO_SND_R_PCM_PREPARE:
+        virtio_snd_handle_pcm_prepare(s, cmd);
+        break;
     case VIRTIO_SND_R_PCM_RELEASE:
         cmd->resp.code = cpu_to_le32(VIRTIO_SND_S_NOT_SUPP);
         break;