From: Takashi Iwai <tiwai@suse.de>
Date: Fri, 14 Dec 2007 14:19:03 +0000 (+0100)
Subject: Add snd_pcm_ioplug_set_state() function
X-Git-Tag: v1.0.16rc1~29
X-Git-Url: https://git.alsa-project.org/?a=commitdiff_plain;h=ce64f433a64b797b423cf7f24b9514dbeb17cf35;p=alsa-lib.git

Add snd_pcm_ioplug_set_state() function

Added an exported function snd_pcm_ioplug_set_state() to change
the PCM state of ioplug from the plugin side (e.g. from another
thread).
---

diff --git a/include/pcm_ioplug.h b/include/pcm_ioplug.h
index f8a23f69..f740a197 100644
--- a/include/pcm_ioplug.h
+++ b/include/pcm_ioplug.h
@@ -208,6 +208,9 @@ void snd_pcm_ioplug_params_reset(snd_pcm_ioplug_t *io);
 int snd_pcm_ioplug_set_param_minmax(snd_pcm_ioplug_t *io, int type, unsigned int min, unsigned int max);
 int snd_pcm_ioplug_set_param_list(snd_pcm_ioplug_t *io, int type, unsigned int num_list, const unsigned int *list);
 
+/* change PCM status */
+int snd_pcm_ioplug_set_state(snd_pcm_ioplug_t *ioplug, snd_pcm_state_t state);
+
 /** \} */
 
 #endif /* __ALSA_PCM_IOPLUG_H */
diff --git a/src/pcm/pcm_ioplug.c b/src/pcm/pcm_ioplug.c
index 19dab979..7bf19ca1 100644
--- a/src/pcm/pcm_ioplug.c
+++ b/src/pcm/pcm_ioplug.c
@@ -614,6 +614,8 @@ static snd_pcm_sframes_t snd_pcm_ioplug_avail_update(snd_pcm_t *pcm)
 	snd_pcm_uframes_t avail;
 
 	snd_pcm_ioplug_hw_ptr_update(pcm);
+	if (io->data->state == SNDRV_PCM_STATE_XRUN)
+		return -EPIPE;
 	if (pcm->stream == SND_PCM_STREAM_CAPTURE &&
 	    pcm->access != SND_PCM_ACCESS_RW_INTERLEAVED &&
 	    pcm->access != SND_PCM_ACCESS_RW_NONINTERLEAVED) {
@@ -1037,3 +1039,19 @@ const snd_pcm_channel_area_t *snd_pcm_ioplug_mmap_areas(snd_pcm_ioplug_t *ioplug
 		return snd_pcm_mmap_areas(ioplug->pcm);
 	return NULL;
 }
+
+/**
+ * \brief Change the ioplug PCM status
+ * \param ioplug the ioplug handle
+ * \param state the PCM status
+ * \return zero if successful or a negative error code
+ *
+ * Changes the PCM status of the ioplug to the given value.
+ * This function can be used for external plugins to notify the status
+ * change, e.g. XRUN.
+ */
+int snd_pcm_ioplug_set_state(snd_pcm_ioplug_t *ioplug, snd_pcm_state_t state)
+{
+	ioplug->state = state;
+	return 0;
+}