From bb395ea2ca31925d81e928e7566474fe8e0970cf Mon Sep 17 00:00:00 2001
From: Sachin Mohan Gadag <sgadag@codeaurora.org>
Date: Thu, 21 Sep 2017 17:27:50 +0530
Subject: [PATCH] audio: Add new pcm functions

Add pcm_get_poll_fd, pcm_mmap_get_hw_ptr function
definition for audio.
---
 src/pcm.c | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)

diff --git a/tinyalsa-git/src/pcm.c b/tinyalsa-git/src/pcm.c
index 75fc85c..fed1fce 100644
--- a/tinyalsa-git/src/pcm.c
+++ b/tinyalsa-git/src/pcm.c
@@ -518,6 +518,35 @@ int pcm_get_htimestamp(struct pcm *pcm, unsigned int *avail,
     return 0;
 }
 
+int pcm_mmap_get_hw_ptr(struct pcm* pcm, unsigned int *hw_ptr, struct timespec *tstamp)
+{
+    int frames;
+    int rc;
+
+    if (pcm == NULL || hw_ptr == NULL || tstamp == NULL)
+        return oops(pcm, EINVAL, "pcm %p, hw_ptr %p, tstamp %p", pcm, hw_ptr, tstamp);
+
+    if (!pcm_is_ready(pcm))
+        return oops(pcm, errno, "pcm_is_ready failed");
+
+    rc = pcm_sync_ptr(pcm, SNDRV_PCM_SYNC_PTR_HWSYNC);
+    if (rc < 0)
+        return oops(pcm, errno, "pcm_sync_ptr failed");
+
+    if ((pcm->mmap_status->state != PCM_STATE_RUNNING) &&
+            (pcm->mmap_status->state != PCM_STATE_DRAINING))
+        return oops(pcm, ENOSYS, "invalid stream state %d", pcm->mmap_status->state);
+
+    *tstamp = pcm->mmap_status->tstamp;
+    if (tstamp->tv_sec == 0 && tstamp->tv_nsec == 0)
+        return oops(pcm, errno, "invalid time stamp");
+
+    *hw_ptr = pcm->mmap_status->hw_ptr;
+
+    return 0;
+}
+
+
 /** Writes audio samples to PCM.
  * If the PCM has not been started, it is started in this function.
  * This function is only valid for PCMs opened with the @ref PCM_OUT flag.
@@ -1331,6 +1360,11 @@ int pcm_wait(struct pcm *pcm, int timeout)
     return 1;
 }
 
+int pcm_get_poll_fd(struct pcm *pcm)
+{
+    return pcm->fd;
+}
+
 int pcm_mmap_transfer(struct pcm *pcm, const void *buffer, unsigned int bytes)
 {
     int err = 0, frames, avail;
-- 
1.9.1