Add prorotypes

sysprog21 · Sep 18, 2024 · 1c8bd5e · 1c8bd5e
1 parent de49607
commit 1c8bd5e
Showing 1 changed file with 39 additions and 3 deletions.
diff --git a/virtio-snd.c b/virtio-snd.c
@@ -318,6 +318,39 @@ static void virtio_snd_read_pcm_prepare(struct virtq_desc *vq_desc,
     hdr->stream_id = 0;
 }
 
+static void virtio_snd_read_pcm_start(struct virtq_desc *vq_desc,
+                                      const virtio_snd_query_info_t *query)
+{
+    virtio_snd_pcm_hdr_t *hdr =
+        (virtio_snd_pcm_hdr_t *) ((uintptr_t) vq_desc[2].addr);
+
+    /* TODO: let application to set stream_id at will */
+    hdr->hdr.code = VIRTIO_SND_R_PCM_START;
+    hdr->stream_id = 0;
+}
+
+static void virtio_snd_read_pcm_stop(struct virtq_desc *vq_desc,
+                                     const virtio_snd_query_info_t *query)
+{
+    virtio_snd_pcm_hdr_t *hdr =
+        (virtio_snd_pcm_hdr_t *) ((uintptr_t) vq_desc[2].addr);
+
+    /* TODO: let application to set stream_id at will */
+    hdr->hdr.code = VIRTIO_SND_R_PCM_STOP;
+    hdr->stream_id = 0;
+}
+
+static void virtio_snd_read_pcm_release(struct virtq_desc *vq_desc,
+                                        const virtio_snd_query_info_t *query)
+{
+    virtio_snd_pcm_hdr_t *hdr =
+        (virtio_snd_pcm_hdr_t *) ((uintptr_t) vq_desc[2].addr);
+
+    /* TODO: let application to set stream_id at will */
+    hdr->hdr.code = VIRTIO_SND_R_PCM_RELEASE;
+    hdr->stream_id = 0;
+}
+
 static void virtio_snd_cb(struct CNFADriver *dev,
                           short *out,
                           short *in,
@@ -394,11 +427,14 @@ static int virtio_snd_desc_handler(virtio_snd_state_t *vsnd,
         virtio_snd_read_pcm_prepare(vq_desc, query);
         break;
     case VIRTIO_SND_R_PCM_RELEASE:
+        virtio_snd_read_pcm_release(vq_desc, query);
+        break;
     case VIRTIO_SND_R_PCM_START:
+        virtio_snd_read_pcm_start(vq_desc, query);
+        break;
     case VIRTIO_SND_R_PCM_STOP:
-        fprintf(stderr, "currently not suppored by virtio-snd\n");
-        *status = VIRTIO_SND_S_NOT_SUPP;
-        return -1;
+        virtio_snd_read_pcm_stop(vq_desc, query);
+        break;
     default:
         fprintf(stderr, "unsupported virtio-snd operation!\n");
         *status = VIRTIO_SND_S_NOT_SUPP;