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authorJohn Grossman2012-04-03 18:37:38 -0500
committerJohn Grossman2012-04-03 18:59:59 -0500
commit673253acf06838bb24d0b0b1a3962bed573855b8 (patch)
treec6c8a6a063171ec87872f40e585b13dc5e757a3a /include/tinyalsa
parent1b32ddfd35e54b0a6ef1e43ca35dbc1547e5676a (diff)
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tinyalsa: Add PCM_NORESTART flag.
Add a flag which can be passed to pcm_open (called PCM_NORESTART). When set on a playback stream, calls to pcm_write will not automatically attempt to restart an ALSA device in the case of an underflow. Instead, it will propagate the first EPIPE error up to the application to allow it to handle the underflow situation. Subsequent calls to pcm_write will attempt to start the pipeline. Change-Id: If17973c6de9079c4227631bac9ff09b218377344 Signed-off-by: John Grossman <johngro@google.com>
Diffstat (limited to 'include/tinyalsa')
-rw-r--r--include/tinyalsa/asoundlib.h9
1 files changed, 9 insertions, 0 deletions
diff --git a/include/tinyalsa/asoundlib.h b/include/tinyalsa/asoundlib.h
index d6409fe..cb70439 100644
--- a/include/tinyalsa/asoundlib.h
+++ b/include/tinyalsa/asoundlib.h
@@ -45,6 +45,15 @@ struct pcm;
45#define PCM_IN 0x10000000 45#define PCM_IN 0x10000000
46#define PCM_MMAP 0x00000001 46#define PCM_MMAP 0x00000001
47#define PCM_NOIRQ 0x00000002 47#define PCM_NOIRQ 0x00000002
48#define PCM_NORESTART 0x00000004 /* PCM_NORESTART - when set, calls to
49 * pcm_write for a playback stream will not
50 * attempt to restart the stream in the case
51 * of an underflow, but will return -EPIPE
52 * instead. After the first -EPIPE error, the
53 * stream is considered to be stopped, and a
54 * second call to pcm_write will attempt to
55 * restart the stream.
56 */
48 57
49/* PCM runtime states */ 58/* PCM runtime states */
50#define PCM_STATE_OPEN 0 59#define PCM_STATE_OPEN 0