From fcb8361dc32c8b55ce8a5385dae620a1e9d61177 Mon Sep 17 00:00:00 2001
From: Simon Wilson
Date: Fri, 24 Jun 2011 11:08:10 -0700
Subject: Update tinyalsa for pcm_start/stop() support

d6458e6 pcm: add pcm_start/stop() functions for streams

Change-Id: Iba1dd4e6adc0be68008b44978d55231c584e92c4
---
 include/tinyalsa/asoundlib.h |  4 ++++
 pcm.c                        | 19 +++++++++++++++++++
 2 files changed, 23 insertions(+)

diff --git a/include/tinyalsa/asoundlib.h b/include/tinyalsa/asoundlib.h
index bd0cdee..14511c9 100644
--- a/include/tinyalsa/asoundlib.h
+++ b/include/tinyalsa/asoundlib.h
@@ -97,6 +97,10 @@ unsigned int pcm_get_latency(struct pcm *pcm);
 int pcm_write(struct pcm *pcm, void *data, unsigned int count);
 int pcm_read(struct pcm *pcm, void *data, unsigned int count);
 
+/* Start and stop a PCM channel that doesn't transfer data */
+int pcm_start(struct pcm *pcm);
+int pcm_stop(struct pcm *pcm);
+
 
 /*
  * MIXER API
diff --git a/pcm.c b/pcm.c
index adc0495..3ba51ba 100644
--- a/pcm.c
+++ b/pcm.c
@@ -350,3 +350,22 @@ int pcm_is_ready(struct pcm *pcm)
 {
     return pcm->fd >= 0;
 }
+
+int pcm_start(struct pcm *pcm)
+{
+    if (ioctl(pcm->fd, SNDRV_PCM_IOCTL_PREPARE) < 0)
+        return oops(pcm, errno, "cannot prepare channel");
+    if (ioctl(pcm->fd, SNDRV_PCM_IOCTL_START) < 0)
+        return oops(pcm, errno, "cannot start channel");
+
+    return 0;
+}
+
+int pcm_stop(struct pcm *pcm)
+{
+    if (ioctl(pcm->fd, SNDRV_PCM_IOCTL_DROP) < 0)
+        return oops(pcm, errno, "cannot stop channel");
+
+    return 0;
+}
+
-- 
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