Set playback setting in pcm_set_param

Author: Cuda-Chen

virtio-snd.c

@@ -349,14 +349,11 @@ static void virtio_snd_read_pcm_set_params(struct virtq_desc *vq_desc,
 {
 #if 0
     /* TODO: detect current state of stream */
-    virtio_snd_pcm_set_params_t *info =
-        (virtio_snd_pcm_set_params_t *) ((uintptr_t) vq_desc[1].addr);
-
     /* 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 = VIRTIO_SND_PCM_F_SHMEM_HOST;
+    info->hdr.stream_id = 0;
     info->buffer_bytes = 2048;
     info->period_bytes = 1024;
     info->features = 0;
@@ -365,6 +362,17 @@ static void virtio_snd_read_pcm_set_params(struct virtq_desc *vq_desc,
     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; 
+    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;
+    vsnd_props[id].pp.features = request->features;
+    vsnd_props[id].pp.channels = request->channels;
+    vsnd_props[id].pp.format = request->format;
+    vsnd_props[id].pp.rate = request->rate;
+    vsnd_props[id].pp.padding = request->padding;
+
     fprintf(stderr, "virtio_snd_read_pcm_set_params\n");
 }
 
@@ -377,6 +385,7 @@ static void virtio_snd_read_pcm_prepare(struct virtq_desc *vq_desc,
     /* TODO: add lock to avoid race condition */
     guest_playing = false;
 
+
     fprintf(stderr, "virtio_snd_read_pcm_prepare\n");
 }