Initialize CNFA driver in pcm_prepare

Author: Cuda-Chen

virtio-snd.c

@@ -237,10 +237,18 @@ static virtio_snd_config_t vsnd_configs[VSND_DEV_CNT_MAX];
 static virtio_snd_prop_t vsnd_props[VSND_DEV_CNT_MAX];
 static int vsnd_dev_cnt = 0;
 
-//static struct CNFADriver *audio_host = NULL;
+// static struct CNFADriver *audio_host = NULL;
 
 static bool guest_playing = false;
 
+/* Forward declaration */
+static void virtio_snd_cb(struct CNFADriver *dev,
+                          short *out,
+                          short *in,
+                          int framesp,
+                          int framesr);
+
+
 static void virtio_snd_set_fail(virtio_snd_state_t *vsnd)
 {
     vsnd->Status |= VIRTIO_STATUS__DEVICE_NEEDS_RESET;
@@ -347,23 +355,12 @@ static void virtio_snd_read_chmap_info_handler(
 static void virtio_snd_read_pcm_set_params(struct virtq_desc *vq_desc,
                                            const virtio_snd_query_info_t *query)
 {
-#if 0
     /* TODO: detect current state of stream */
-    /* TODO: let application to set each value at will */
     /* TODO: check the valiability of buffer_bytes, period_bytes, channel_min,
      * and channel_max */
-    info->hdr.hdr.code = VIRTIO_SND_R_PCM_SET_PARAMS;
-    info->hdr.stream_id = 0;
-    info->buffer_bytes = 2048;
-    info->period_bytes = 1024;
-    info->features = 0;
-    info->channels = 1;
-    info->format = (1 << VIRTIO_SND_PCM_FMT_S16);
-    info->rate = (1 << VIRTIO_SND_PCM_RATE_44100);
-    info->padding = 0;
-#endif
+
     virtio_snd_pcm_set_params_t *request = query;
-    uint32_t id = request->hdr.stream_id; 
+    uint32_t id = request->hdr.stream_id;
     vsnd_props[id].pp.hdr.hdr.code = VIRTIO_SND_R_PCM_SET_PARAMS;
     vsnd_props[id].pp.buffer_bytes = request->buffer_bytes;
     vsnd_props[id].pp.period_bytes = request->period_bytes;
@@ -379,13 +376,16 @@ static void virtio_snd_read_pcm_set_params(struct virtq_desc *vq_desc,
 static void virtio_snd_read_pcm_prepare(struct virtq_desc *vq_desc,
                                         const virtio_snd_query_info_t *query)
 {
-    /* TODO: let application to set stream_id at will */
+    virtio_snd_pcm_hdr_t *request = query;
+    uint32_t stream_id = request->stream_id;
+    vsnd_props[stream_id].audio_host = CNFAInit(
+        NULL, "semu-virtio-snd", virtio_snd_cb, 44100, 0, 1, 0,
+        vsnd_props[stream_id].pp.buffer_bytes, NULL, NULL, &guest_playing);
 
     /* Control the callback to prepare the buffer */
     /* TODO: add lock to avoid race condition */
     guest_playing = false;
 
-
     fprintf(stderr, "virtio_snd_read_pcm_prepare\n");
 }