From 63774125d92c356c66023ca5460b108cd8f69bdf Mon Sep 17 00:00:00 2001
From: libei1 <libei1@xiaomi.com>
Date: Thu, 15 Jun 2023 20:14:50 +0800
Subject: [PATCH] arch/sim : Audio driver add AUDIOIOC_GETLATENCY ioctl

add AUDIOIOC_GETLATENCY definition, and add reference code in sim alsa.

Signed-off-by: libei1 <libei1@xiaomi.com>
---
 arch/sim/src/sim/posix/sim_alsa.c | 32 +++++++++++++++++++++++++++++++
 include/nuttx/audio/audio.h       |  1 +
 2 files changed, 33 insertions(+)

diff --git a/arch/sim/src/sim/posix/sim_alsa.c b/arch/sim/src/sim/posix/sim_alsa.c
index cf77448d80..640f824374 100644
--- a/arch/sim/src/sim/posix/sim_alsa.c
+++ b/arch/sim/src/sim/posix/sim_alsa.c
@@ -600,6 +600,38 @@ static int sim_audio_ioctl(struct audio_lowerhalf_s *dev, int cmd,
           audinfo("%s , arg: %s\n", __func__, (char *)arg);
         } break;
 
+      case AUDIOIOC_GETLATENCY:
+        {
+          long *latency = (long *)arg;
+          long remain = 0;
+          dq_entry_t *cur;
+
+          if (!priv->pcm)
+            {
+              ret = -ENXIO;
+              break;
+            }
+
+          ret = snd_pcm_delay(priv->pcm, latency);
+          if (ret < 0)
+            {
+              return ret;
+            }
+          else
+            {
+              remain = priv->aux->nbytes - priv->aux->curbyte;
+
+              for (cur = dq_peek(&priv->pendq); cur; cur = dq_next(cur))
+                {
+                  struct ap_buffer_s *apb = (struct ap_buffer_s *)cur;
+                  remain += apb->nbytes - apb->curbyte;
+                }
+
+              *latency += remain / priv->frame_size;
+            }
+        }
+        break;
+
       default:
         ret = -ENOTTY;
         break;
diff --git a/include/nuttx/audio/audio.h b/include/nuttx/audio/audio.h
index 7bb3021f98..49124360ff 100644
--- a/include/nuttx/audio/audio.h
+++ b/include/nuttx/audio/audio.h
@@ -112,6 +112,7 @@
 #define AUDIOIOC_HWRESET            _AUDIOIOC(16)
 #define AUDIOIOC_SETBUFFERINFO      _AUDIOIOC(17)
 #define AUDIOIOC_SETPARAMTER        _AUDIOIOC(18)
+#define AUDIOIOC_GETLATENCY         _AUDIOIOC(19)
 
 /* Audio Device Types *******************************************************/