diff options
author | Lennart Poettering <lennart@poettering.net> | 2009-08-19 01:35:43 +0200 |
---|---|---|
committer | Lennart Poettering <lennart@poettering.net> | 2009-08-19 01:35:43 +0200 |
commit | 24e582808c18d6866d8c10f8f0320b1af0ab758b (patch) | |
tree | 2f632722d576995f19bf90c6a17272eade31387e /src/modules/alsa/alsa-source.c | |
parent | 2838b78e59ee7c8ea42fec6880cc4c2b2a2c9485 (diff) |
source: rework volume handling
- drop the 'virtual_' prefix from s->virtual_volume since we don't
distuingish between reference and real volumes for sources
- introduce an accuracy for source volumes: if the hardware can control
the volume "close enough" don't necessarily adjust the rest in
software unless it is beyond a certain threshold. This should save a
little bit of CPU at the expensive of a bit of accuracy in volume
handling.
- other minor cleanups
Diffstat (limited to 'src/modules/alsa/alsa-source.c')
-rw-r--r-- | src/modules/alsa/alsa-source.c | 37 |
1 files changed, 24 insertions, 13 deletions
diff --git a/src/modules/alsa/alsa-source.c b/src/modules/alsa/alsa-source.c index 9a51f857..7da37553 100644 --- a/src/modules/alsa/alsa-source.c +++ b/src/modules/alsa/alsa-source.c @@ -65,6 +65,8 @@ #define TSCHED_MIN_SLEEP_USEC (10*PA_USEC_PER_MSEC) /* 10ms */ #define TSCHED_MIN_WAKEUP_USEC (4*PA_USEC_PER_MSEC) /* 4ms */ +#define VOLUME_ACCURACY (PA_VOLUME_NORM/100) + struct userdata { pa_core *core; pa_module *module; @@ -987,15 +989,11 @@ static void source_get_volume_cb(pa_source *s) { if (pa_cvolume_equal(&u->hardware_volume, &r)) return; - s->virtual_volume = u->hardware_volume = r; - - if (u->mixer_path->has_dB) { - pa_cvolume reset; + s->volume = u->hardware_volume = r; - /* Hmm, so the hardware volume changed, let's reset our software volume */ - pa_cvolume_reset(&reset, s->sample_spec.channels); - pa_source_set_soft_volume(s, &reset); - } + /* Hmm, so the hardware volume changed, let's reset our software volume */ + if (u->mixer_path->has_dB) + pa_source_set_soft_volume(s, NULL); } static void source_set_volume_cb(pa_source *s) { @@ -1008,7 +1006,7 @@ static void source_set_volume_cb(pa_source *s) { pa_assert(u->mixer_handle); /* Shift up by the base volume */ - pa_sw_cvolume_divide_scalar(&r, &s->virtual_volume, s->base_volume); + pa_sw_cvolume_divide_scalar(&r, &s->volume, s->base_volume); if (pa_alsa_path_set_volume(u->mixer_path, u->mixer_handle, &s->channel_map, &r) < 0) return; @@ -1019,13 +1017,26 @@ static void source_set_volume_cb(pa_source *s) { u->hardware_volume = r; if (u->mixer_path->has_dB) { + pa_cvolume new_soft_volume; + pa_bool_t accurate_enough; /* Match exactly what the user requested by software */ - pa_sw_cvolume_divide(&s->soft_volume, &s->virtual_volume, &u->hardware_volume); + pa_sw_cvolume_divide(&new_soft_volume, &s->volume, &u->hardware_volume); + + /* If the adjustment to do in software is only minimal we + * can skip it. That saves us CPU at the expense of a bit of + * accuracy */ + accurate_enough = + (pa_cvolume_min(&new_soft_volume) >= (PA_VOLUME_NORM - VOLUME_ACCURACY)) && + (pa_cvolume_max(&new_soft_volume) <= (PA_VOLUME_NORM + VOLUME_ACCURACY)); - pa_log_debug("Requested volume: %s", pa_cvolume_snprint(t, sizeof(t), &s->virtual_volume)); + pa_log_debug("Requested volume: %s", pa_cvolume_snprint(t, sizeof(t), &s->volume)); pa_log_debug("Got hardware volume: %s", pa_cvolume_snprint(t, sizeof(t), &u->hardware_volume)); - pa_log_debug("Calculated software volume: %s", pa_cvolume_snprint(t, sizeof(t), &s->soft_volume)); + pa_log_debug("Calculated software volume: %s (accurate-enough=%s)", pa_cvolume_snprint(t, sizeof(t), &new_soft_volume), + pa_yes_no(accurate_enough)); + + if (!accurate_enough) + s->soft_volume = new_soft_volume; } else { pa_log_debug("Wrote hardware volume: %s", pa_cvolume_snprint(t, sizeof(t), &r)); @@ -1033,7 +1044,7 @@ static void source_set_volume_cb(pa_source *s) { /* We can't match exactly what the user requested, hence let's * at least tell the user about it */ - s->virtual_volume = r; + s->volume = r; } } |