Hi all,
I modified my previous patch for supporting a period_size (rather than
period_bytes) constraint with Takashi's suggestion that the fields be non-zero
for either constraint to kick in. See file in attachment. It has worked fine on
my hardware for the past few days.
Guilhem.
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--- alsa-kernel/include_orig/pcm.h Tue Aug 6 03:28:27 2002
+++ alsa-kernel/include/pcm.h Wed Sep 4 13:32:19 2002
@@ -75,6 +75,8 @@
unsigned int channels_min; /* min channels */
unsigned int channels_max; /* max channels */
size_t buffer_bytes_max; /* max buffer size */
+ size_t period_size_min; /* min size size (in samples) */
+ size_t period_size_max; /* max size size (in samples) */
size_t period_bytes_min; /* min period size */
size_t period_bytes_max; /* max period size */
unsigned int periods_min; /* min # of periods */
--- alsa-kernel/core_orig/pcm_native.c Tue Aug 13 12:13:34 2002
+++ alsa-kernel/core/pcm_native.c Fri Sep 6 12:52:44 2002
@@ -1628,9 +1628,17 @@
hw->rate_min, hw->rate_max);
snd_assert(err >= 0, return -EINVAL);
+ if (hw->period_size_min || hw->period_size_max) {
+ err = snd_pcm_hw_constraint_minmax(runtime,
+SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
+ hw->period_size_min,
+hw->period_size_max);
+ snd_assert(err >= 0, return -EINVAL);
+ }
+
+ if (hw->period_bytes_min || hw->period_bytes_max) {
err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
hw->period_bytes_min, hw->period_bytes_max);
snd_assert(err >= 0, return -EINVAL);
+ }
err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
hw->periods_min, hw->periods_max);
