Get frames from queue in pcm_start state

Author: Cuda-Chen

virtio-snd.c

@@ -3,7 +3,7 @@
 #include <pthread.h>
 #include <stdio.h>
 #include <string.h>
-
+#include <stdlib.h>
 #define CNFA_IMPLEMENTATION
 #include "CNFA_sf.h"
 
@@ -21,7 +21,7 @@
 #define PRIV(x) ((virtio_snd_config_t *) x->priv)
 
 #define VSND_CNFA_FRAME_SZ 2
-
+FILE *outfile;
 enum {
     VSND_QUEUE_CTRL = 0,
     VSND_QUEUE_EVT = 1,
@@ -562,6 +562,7 @@ static void virtio_snd_read_pcm_prepare(const virtio_snd_pcm_hdr_t *query,
     pthread_cond_init(&props->ring.readable, NULL);
     pthread_cond_init(&props->ring.writable, NULL);
     INIT_LIST_HEAD(&props->buf_queue_head);
+    outfile = fopen("out_enque.bin", "wb");
 
     *plen = 0;
     fprintf(stderr, "virtio_snd_read_pcm_prepare\n");
@@ -635,7 +636,7 @@ static void virtio_snd_read_pcm_release(const virtio_snd_pcm_hdr_t *query,
     }
 
     props->pp.hdr.hdr.code = VIRTIO_SND_R_PCM_RELEASE;
-
+    fclose(outfile);
     /* Tear down the PCM ring buffer. */
     free(props->ring.buffer);
     pthread_mutex_destroy(&props->ring.lock);
@@ -712,12 +713,16 @@ static void __virtio_snd_frame_dequeue(short *out,
 
     props->ring.cons.tail = cons_next;
 
-    if (list_empty(&props->buf_queue_head))
-        goto finally;
+    uint32_t len = 0;
+    while (
+            !list_empty(&props->buf_queue_head) &&
+            len < n) {
     vsnd_buf_queue_node_t *node =
         list_first_entry(&props->buf_queue_head, vsnd_buf_queue_node_t, q);
     list_del(&node->q);
     memcpy(out, node->addr, node->len);
+    len += node->len;
+    }
 
 finally:
     props->ring.buf_ev_notity--;
@@ -920,6 +925,7 @@ static void __virtio_snd_frame_enqueue(void *payload,
     node->addr = payload;
     node->len = n;
     list_push(&node->q, &props->buf_queue_head);
+    fwrite(node->addr, sizeof(void), node->len, outfile);
 
     uint32_t period_bytes = props->pp.period_bytes;
     if (prod_next - cons_tail >= period_bytes) {