diff options
Diffstat (limited to 'source/l/alsa-lib/alsa-lib.fix.pcm.interval.patch')
| -rw-r--r-- | source/l/alsa-lib/alsa-lib.fix.pcm.interval.patch | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/source/l/alsa-lib/alsa-lib.fix.pcm.interval.patch b/source/l/alsa-lib/alsa-lib.fix.pcm.interval.patch new file mode 100644 index 00000000..fa8f379a --- /dev/null +++ b/source/l/alsa-lib/alsa-lib.fix.pcm.interval.patch @@ -0,0 +1,72 @@ +From b420056604f06117c967b65d43d01536c5ffcbc9 Mon Sep 17 00:00:00 2001 +From: Timo Wischer <twischer@de.adit-jv.com> +Date: Thu, 18 Oct 2018 13:33:24 +0200 +Subject: [PATCH] pcm: interval: Interpret (x x+1] correctly and return x+1 + +Without this change an interval of (x x+1] will be interpreted as an +empty interval but the right value would be x+1. +This leads to a failing snd_pcm_hw_params() call which returns -EINVAL. + +An example issue log is given in the following: +snd_pcm_hw_params failed with err -22 (Invalid argument) +ACCESS: MMAP_NONINTERLEAVED +FORMAT: S16_LE +SUBFORMAT: STD +SAMPLE_BITS: 16 +FRAME_BITS: 16 +CHANNELS: 1 +RATE: 16000 +PERIOD_TIME: (15999 16000] +PERIOD_SIZE: (255 256] +PERIOD_BYTES: (510 512] +PERIODS: [2 3) +BUFFER_TIME: 32000 +BUFFER_SIZE: 512 +BUFFER_BYTES: 1024 + +In case of (x x+1) we have to interpret it anyway as a single value of x to +compensate rounding issues. +For example the period size will result in an interval of (352 353) when +the period time is 16ms and the sample rate 22050 Hz +(16ms * 22,05 kHz = 352,8 frames). But 352 has to be chosen to allow a +buffer size of 705 (32ms * 22,05 kHz = 705,6 frames) which has to be >= 2x +period size to avoid Xruns. The buffer size will not end up with an +interval of (705 706) simular to the period size because +snd_pcm_rate_hw_refine_cchange() calls snd_interval_floor() for the buffer +size. Therefore this value will be interpreted as an integer interval +instead of a real interval further on. + +This issue seems to exist since the change of 9bb985c38 ("pcm: +snd_interval_refine_first/last: exclude value only if also excluded +before") + +Signed-off-by: Timo Wischer <twischer@de.adit-jv.com> +Signed-off-by: Jaroslav Kysela <perex@perex.cz> +--- + src/pcm/interval_inline.h | 4 +++- + 1 file changed, 3 insertions(+), 1 deletion(-) + +diff --git a/src/pcm/interval_inline.h b/src/pcm/interval_inline.h +index a68e292..d9a30b2 100644 +--- a/src/pcm/interval_inline.h ++++ b/src/pcm/interval_inline.h +@@ -51,12 +51,14 @@ INTERVAL_INLINE int snd_interval_single(const snd_interval_t *i) + { + assert(!snd_interval_empty(i)); + return (i->min == i->max || +- (i->min + 1 == i->max && i->openmax)); ++ (i->min + 1 == i->max && (i->openmin || i->openmax))); + } + + INTERVAL_INLINE int snd_interval_value(const snd_interval_t *i) + { + assert(snd_interval_single(i)); ++ if (i->openmin && !i->openmax) ++ return i->max; + return i->min; + } + +-- +1.7.11.7 + + |