Add ioctls so that PCM decoder can configure the driver bitrate, num channels, and sample width

audio/pcm_decode.c

@@ -695,12 +695,13 @@ static int pcm_enqueuebuffer(FAR struct audio_lowerhalf_s *dev,
   FAR struct pcm_decode_s *priv = (FAR struct pcm_decode_s *)dev;
   FAR struct audio_lowerhalf_s *lower;
   apb_samp_t bytesleft;
+  int ret;
 
   DEBUGASSERT(priv);
   audvdbg("Received buffer %p, streaming=%d\n", apb, priv->streaming);
 
   lower = priv->lower;
-  DEBUGASSERT(lower && lower->ops->enqueuebuffer);
+  DEBUGASSERT(lower && lower->ops->enqueuebuffer && lower->ops->ioctl);
 
   /* Are we streaming yet? */
 
@@ -734,8 +735,33 @@ static int pcm_enqueuebuffer(FAR struct audio_lowerhalf_s *dev,
 
           priv->streaming = true;
 
-          /* Configure the lower level for the number of channels and bitrate */
+          /* Configure the lower level for the number of channels, bitrate,
-#warning Missing logic
+           * and sample bitwidth.
+           */
+
+          ret = lower->ops->ioctl(lower, AUDIOIOC_BITRATE,
+                                  (unsigned long)priv->samprate);
+          if (ret < 0)
+            {
+              auddbg("ERROR: Failed to set bit rate: %d\n", ret);
+              return ret;
+            }
+
+          ret = lower->ops->ioctl(lower, AUDIOIOC_NCHANNELS,
+                                  (unsigned long)priv->nchannels);
+          if (ret < 0)
+            {
+              auddbg("ERROR: Failed to set number of channels: %d\n", ret);
+              return ret;
+            }
+
+          ret = lower->ops->ioctl(lower, AUDIOIOC_SAMPWIDTH,
+                                  (unsigned long)priv->bpsamp);
+          if (ret < 0)
+            {
+              auddbg("ERROR: Failed to set sample width: %d\n", ret);
+              return ret;
+            }
 
           /* Bump up the data offset and pass the buffer to the lower level */
 

drivers/audio/audio_null.c

@@ -661,18 +661,44 @@ static int null_ioctl(FAR struct audio_lowerhalf_s *dev, int cmd,
        */
 
       case AUDIOIOC_HWRESET:
+        {
+          audvdbg("AUDIOIOC_HWRESET:\n");
+        }
         break;
 
        /* Report our preferred buffer size and quantity */
 
 #ifdef CONFIG_AUDIO_DRIVER_SPECIFIC_BUFFERS
       case AUDIOIOC_GETBUFFERINFO:
-        bufinfo              = (FAR struct ap_buffer_info_s *) arg;
+        {
-        bufinfo->buffer_size = CONFIG_AUDIO_NULL_BUFFER_SIZE;
+          audvdbg("AUDIOIOC_GETBUFFERINFO:\n");
-        bufinfo->nbuffers    = CONFIG_AUDIO_NULL_NUM_BUFFERS;
+          bufinfo              = (FAR struct ap_buffer_info_s *) arg;
+          bufinfo->buffer_size = CONFIG_AUDIO_NULL_BUFFER_SIZE;
+          bufinfo->nbuffers    = CONFIG_AUDIO_NULL_NUM_BUFFERS;
+        }
         break;
 #endif
 
+      /* Data stream configuration */
+
+      case AUDIOIOC_BITRATE:
+        {
+          audvdbg("AUDIOIOC_BITRATE: Set bit rate: %lu\n", arg);
+        }
+        break;
+
+      case AUDIOIOC_NCHANNELS:
+        {
+          audvdbg("AUDIOIOC_NCHANNELS: Set number of channels: %lu\n", arg);
+        }
+        break;
+
+      case AUDIOIOC_SAMPWIDTH:
+        {
+          audvdbg("AUDIOIOC_SAMPWIDTH: Set sample width: %lu\n", arg);
+        }
+        break;
+
       default:
         break;
     }

drivers/audio/wm8904.c

@@ -1448,20 +1448,47 @@ static int wm8904_ioctl(FAR struct audio_lowerhalf_s *dev, int cmd,
        */
 
       case AUDIOIOC_HWRESET:
-        wm8904_reset((FAR struct wm8904_dev_s *)dev);
+        {
+          audvdbg("AUDIOIOC_HWRESET:\n");
+          wm8904_reset((FAR struct wm8904_dev_s *)dev);
+        }
         break;
 
        /* Report our preferred buffer size and quantity */
 
 #ifdef CONFIG_AUDIO_DRIVER_SPECIFIC_BUFFERS
       case AUDIOIOC_GETBUFFERINFO:
-
+        {
-        bufinfo              = (FAR struct ap_buffer_info_s *) arg;
+          audvdbg("AUDIOIOC_GETBUFFERINFO:\n");
-        bufinfo->buffer_size = CONFIG_WM8904_BUFFER_SIZE;
+          bufinfo              = (FAR struct ap_buffer_info_s *) arg;
-        bufinfo->nbuffers    = CONFIG_WM8904_NUM_BUFFERS;
+          bufinfo->buffer_size = CONFIG_WM8904_BUFFER_SIZE;
+          bufinfo->nbuffers    = CONFIG_WM8904_NUM_BUFFERS;
+        }
         break;
 #endif
 
+      /* Data stream configuration */
+
+      case AUDIOIOC_BITRATE:
+        {
+          audvdbg("AUDIOIOC_BITRATE: Set bit rate: %lu\n", arg);
+#warning Missing logic
+        }
+        break;
+
+      case AUDIOIOC_NCHANNELS:
+        {
+          audvdbg("AUDIOIOC_NCHANNELS: Set number of channels: %lu\n", arg);
+#warning Missing logic
+        }
+        break;
+
+      case AUDIOIOC_SAMPWIDTH:
+        {
+          audvdbg("AUDIOIOC_SAMPWIDTH: Set sample width: %lu\n", arg);
+#warning Missing logic
+        }
+        break;
       default:
         break;
     }

include/nuttx/audio/audio.h

@@ -122,6 +122,16 @@
 #define AUDIOIOC_UNREGISTERMQ       _AUDIOIOC(15)
 #define AUDIOIOC_HWRESET            _AUDIOIOC(16)
 
+/* Additional ioctl commands support operations between audio decoders
+ * and low-level audio drivers.  This ioctls are not used by the higher
+ * level audio logic and need be implemented only in low-level audio
+ * drivers that are driven by a decoder.
+ */
+
+#define AUDIOIOC_BITRATE            _AUDIOIOC(17)
+#define AUDIOIOC_NCHANNELS          _AUDIOIOC(18)
+#define AUDIOIOC_SAMPWIDTH          _AUDIOIOC(19)
+
 /* Audio Device Types *******************************************************/
 /* The NuttX audio interface support different types of audio devices for
  * input, output, synthesis, and manupulation of audio data.  A given driver/