diff options
Diffstat (limited to 'src/modules/alsa/alsa-util.c')
| -rw-r--r-- | src/modules/alsa/alsa-util.c | 40 |
1 files changed, 33 insertions, 7 deletions
diff --git a/src/modules/alsa/alsa-util.c b/src/modules/alsa/alsa-util.c index 0e22d17e..52f12599 100644 --- a/src/modules/alsa/alsa-util.c +++ b/src/modules/alsa/alsa-util.c @@ -43,6 +43,7 @@ #include <pulsecore/once.h> #include <pulsecore/thread.h> #include <pulsecore/conf-parser.h> +#include <pulsecore/core-rtclock.h> #include "alsa-util.h" #include "alsa-mixer.h" @@ -258,6 +259,10 @@ int pa_alsa_set_hw_params( goto finish; } + /* We ignore very small sampling rate deviations */ + if (_ss.rate >= ss->rate*.95 && _ss.rate <= ss->rate*1.05) + _ss.rate = ss->rate; + if (require_exact_channel_number) { if ((ret = snd_pcm_hw_params_set_channels(pcm_handle, hwparams, _ss.channels)) < 0) { pa_log_debug("snd_pcm_hw_params_set_channels(%u) failed: %s", _ss.channels, pa_alsa_strerror(ret)); @@ -302,7 +307,7 @@ int pa_alsa_set_hw_params( if (set_buffer_size(pcm_handle, hwparams_copy, _buffer_size) >= 0 && set_period_size(pcm_handle, hwparams_copy, _period_size) >= 0 && snd_pcm_hw_params(pcm_handle, hwparams_copy) >= 0) { - pa_log_debug("Set buffer size first, period size second."); + pa_log_debug("Set buffer size first (to %lu samples), period size second (to %lu samples).", (unsigned long) _buffer_size, (unsigned long) _period_size); goto success; } @@ -310,7 +315,7 @@ int pa_alsa_set_hw_params( if (set_period_size(pcm_handle, hwparams_copy, _period_size) >= 0 && set_buffer_size(pcm_handle, hwparams_copy, _buffer_size) >= 0 && snd_pcm_hw_params(pcm_handle, hwparams_copy) >= 0) { - pa_log_debug("Set period size first, buffer size second."); + pa_log_debug("Set period size first (to %lu samples), buffer size second (to %lu samples).", (unsigned long) _period_size, (unsigned long) _buffer_size); goto success; } } @@ -321,7 +326,7 @@ int pa_alsa_set_hw_params( /* Third try: set only buffer size */ if (set_buffer_size(pcm_handle, hwparams_copy, _buffer_size) >= 0 && snd_pcm_hw_params(pcm_handle, hwparams_copy) >= 0) { - pa_log_debug("Set only buffer size second."); + pa_log_debug("Set only buffer size (to %lu samples).", (unsigned long) _buffer_size); goto success; } } @@ -332,7 +337,7 @@ int pa_alsa_set_hw_params( /* Fourth try: set only period size */ if (set_period_size(pcm_handle, hwparams_copy, _period_size) >= 0 && snd_pcm_hw_params(pcm_handle, hwparams_copy) >= 0) { - pa_log_debug("Set only period size second."); + pa_log_debug("Set only period size (to %lu samples).", (unsigned long) _period_size); goto success; } } @@ -373,9 +378,7 @@ success: goto finish; } - /* If the sample rate deviates too much, we need to resample */ - if (_ss.rate < ss->rate*.95 || _ss.rate > ss->rate*1.05) - ss->rate = _ss.rate; + ss->rate = _ss.rate; ss->channels = _ss.channels; ss->format = _ss.format; @@ -1308,3 +1311,26 @@ const char* pa_alsa_strerror(int errnum) { return translated; } + +pa_bool_t pa_alsa_may_tsched(pa_bool_t want) { + + if (!want) + return FALSE; + + if (!pa_rtclock_hrtimer()) { + /* We cannot depend on being woken up in time when the timers + are inaccurate, so let's fallback to classic IO based playback + then. */ + pa_log_notice("Disabling timer-based scheduling because high-resolution timers are not available from the kernel."); + return FALSE; } + + if (pa_running_in_vm()) { + /* We cannot depend on being woken up when we ask for in a VM, + * so let's fallback to classic IO based playback then. */ + pa_log_notice("Disabling timer-based scheduling because running inside a VM."); + return FALSE; + } + + + return TRUE; +} |