pcm: rate: add rewindable and forwardable callbacks

This commit does not fix nonsense values returned by the rewind and
forward callbacks. E.g., with period_size = 1024 and buffer_size = 4096,
an attempt to rewind 1024 samples from the nearly-full buffer returns
4090.

Due to these nonsense values, the current rate plugin should be treated
as non-rewindable. That's why the new callbacks return 0.

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

diff --git a/src/pcm/pcm_rate.c b/src/pcm/pcm_rate.c
index 2eb4b1b..58ed842 100644 (file)
--- a/src/pcm/pcm_rate.c
+++ b/src/pcm/pcm_rate.c
@@ -689,6 +689,16 @@ static int snd_pcm_rate_reset(snd_pcm_t *pcm)
        return 0;
 }
 
+static snd_pcm_sframes_t snd_pcm_rate_rewindable(snd_pcm_t *pcm ATTRIBUTE_UNUSED)
+{
+       return 0;
+}
+
+static snd_pcm_sframes_t snd_pcm_rate_forwardable(snd_pcm_t *pcm ATTRIBUTE_UNUSED)
+{
+       return 0;
+}
+
 static snd_pcm_sframes_t snd_pcm_rate_rewind(snd_pcm_t *pcm, snd_pcm_uframes_t frames)
 {
        snd_pcm_rate_t *rate = pcm->private_data;
@@ -1221,7 +1231,9 @@ static const snd_pcm_fast_ops_t snd_pcm_rate_fast_ops = {
        .drop = snd_pcm_generic_drop,
        .drain = snd_pcm_rate_drain,
        .pause = snd_pcm_generic_pause,
+       .rewindable = snd_pcm_rate_rewindable,
        .rewind = snd_pcm_rate_rewind,
+       .forwardable = snd_pcm_rate_forwardable,
        .forward = snd_pcm_rate_forward,
        .resume = snd_pcm_generic_resume,
        .writei = snd_pcm_mmap_writei,