pcm: multi: implement rewindable and forwardable callbacks

Signed-off-by: Alexander E. Patrakov <patrakov@gmail.com>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>

diff --git a/src/pcm/pcm_multi.c b/src/pcm/pcm_multi.c
index f58852c..a84e0ce 100644 (file)
--- a/src/pcm/pcm_multi.c
+++ b/src/pcm/pcm_multi.c
@@ -555,6 +555,42 @@ static int snd_pcm_multi_channel_info(snd_pcm_t *pcm, snd_pcm_channel_info_t *in
        return err;
 }
 
+static snd_pcm_sframes_t snd_pcm_multi_rewindable(snd_pcm_t *pcm)
+{
+       snd_pcm_multi_t *multi = pcm->private_data;
+       unsigned int i;
+       snd_pcm_sframes_t frames = LONG_MAX;
+
+       for (i = 0; i < multi->slaves_count; ++i) {
+               snd_pcm_sframes_t f = snd_pcm_rewindable(multi->slaves[i].pcm);
+               if (f <= 0)
+                       return f;
+               if (f < frames)
+                       frames = f;
+       }
+
+       return frames;
+
+}
+
+static snd_pcm_sframes_t snd_pcm_multi_forwardable(snd_pcm_t *pcm)
+{
+       snd_pcm_multi_t *multi = pcm->private_data;
+       unsigned int i;
+       snd_pcm_sframes_t frames = LONG_MAX;
+
+       for (i = 0; i < multi->slaves_count; ++i) {
+               snd_pcm_sframes_t f = snd_pcm_forwardable(multi->slaves[i].pcm);
+               if (f <= 0)
+                       return f;
+               if (f < frames)
+                       frames = f;
+       }
+
+       return frames;
+
+}
+
 static snd_pcm_sframes_t snd_pcm_multi_rewind(snd_pcm_t *pcm, snd_pcm_uframes_t frames)
 {
        snd_pcm_multi_t *multi = pcm->private_data;
@@ -932,7 +968,9 @@ static const snd_pcm_fast_ops_t snd_pcm_multi_fast_ops = {
        .writen = snd_pcm_mmap_writen,
        .readi = snd_pcm_mmap_readi,
        .readn = snd_pcm_mmap_readn,
+       .rewindable = snd_pcm_multi_rewindable,
        .rewind = snd_pcm_multi_rewind,
+       .forwardable = snd_pcm_multi_forwardable,
        .forward = snd_pcm_multi_forward,
        .resume = snd_pcm_multi_resume,
        .link = snd_pcm_multi_link,