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Diffstat (limited to '')
| -rw-r--r-- | src/mixer/plugins/PulseMixerPlugin.cxx | 225 |
1 files changed, 225 insertions, 0 deletions
diff --git a/src/mixer/plugins/PulseMixerPlugin.cxx b/src/mixer/plugins/PulseMixerPlugin.cxx new file mode 100644 index 000000000..4df88d06b --- /dev/null +++ b/src/mixer/plugins/PulseMixerPlugin.cxx @@ -0,0 +1,225 @@ +/* + * Copyright (C) 2003-2014 The Music Player Daemon Project + * http://www.musicpd.org + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +#include "config.h" +#include "PulseMixerPlugin.hxx" +#include "mixer/MixerInternal.hxx" +#include "output/plugins/PulseOutputPlugin.hxx" +#include "GlobalEvents.hxx" +#include "util/Error.hxx" +#include "util/Domain.hxx" +#include "Log.hxx" + +#include <pulse/context.h> +#include <pulse/introspect.h> +#include <pulse/stream.h> +#include <pulse/subscribe.h> +#include <pulse/error.h> + +#include <assert.h> + +struct PulseMixer final : public Mixer { + PulseOutput *output; + + bool online; + struct pa_cvolume volume; + + PulseMixer(PulseOutput *_output) + :Mixer(pulse_mixer_plugin), + output(_output), online(false) + { + } +}; + +static constexpr Domain pulse_mixer_domain("pulse_mixer"); + +static void +pulse_mixer_offline(PulseMixer *pm) +{ + if (!pm->online) + return; + + pm->online = false; + + GlobalEvents::Emit(GlobalEvents::MIXER); +} + +/** + * Callback invoked by pulse_mixer_update(). Receives the new mixer + * value. + */ +static void +pulse_mixer_volume_cb(gcc_unused pa_context *context, const pa_sink_input_info *i, + int eol, void *userdata) +{ + PulseMixer *pm = (PulseMixer *)userdata; + + if (eol) + return; + + if (i == nullptr) { + pulse_mixer_offline(pm); + return; + } + + pm->online = true; + pm->volume = i->volume; + + GlobalEvents::Emit(GlobalEvents::MIXER); +} + +static void +pulse_mixer_update(PulseMixer *pm, + struct pa_context *context, struct pa_stream *stream) +{ + pa_operation *o; + + assert(context != nullptr); + assert(stream != nullptr); + assert(pa_stream_get_state(stream) == PA_STREAM_READY); + + o = pa_context_get_sink_input_info(context, + pa_stream_get_index(stream), + pulse_mixer_volume_cb, pm); + if (o == nullptr) { + FormatError(pulse_mixer_domain, + "pa_context_get_sink_input_info() failed: %s", + pa_strerror(pa_context_errno(context))); + pulse_mixer_offline(pm); + return; + } + + pa_operation_unref(o); +} + +void +pulse_mixer_on_connect(gcc_unused PulseMixer *pm, + struct pa_context *context) +{ + pa_operation *o; + + assert(context != nullptr); + + o = pa_context_subscribe(context, + (pa_subscription_mask_t)PA_SUBSCRIPTION_MASK_SINK_INPUT, + nullptr, nullptr); + if (o == nullptr) { + FormatError(pulse_mixer_domain, + "pa_context_subscribe() failed: %s", + pa_strerror(pa_context_errno(context))); + return; + } + + pa_operation_unref(o); +} + +void +pulse_mixer_on_disconnect(PulseMixer *pm) +{ + pulse_mixer_offline(pm); +} + +void +pulse_mixer_on_change(PulseMixer *pm, + struct pa_context *context, struct pa_stream *stream) +{ + pulse_mixer_update(pm, context, stream); +} + +static Mixer * +pulse_mixer_init(void *ao, gcc_unused const config_param ¶m, + Error &error) +{ + PulseOutput *po = (PulseOutput *)ao; + + if (ao == nullptr) { + error.Set(pulse_mixer_domain, + "The pulse mixer cannot work without the audio output"); + return nullptr; + } + + PulseMixer *pm = new PulseMixer(po); + + pulse_output_set_mixer(po, pm); + + return pm; +} + +static void +pulse_mixer_finish(Mixer *data) +{ + PulseMixer *pm = (PulseMixer *) data; + + pulse_output_clear_mixer(pm->output, pm); + + delete pm; +} + +static int +pulse_mixer_get_volume(Mixer *mixer, gcc_unused Error &error) +{ + PulseMixer *pm = (PulseMixer *) mixer; + int ret; + + pulse_output_lock(pm->output); + + ret = pm->online + ? (int)((100*(pa_cvolume_avg(&pm->volume)+1))/PA_VOLUME_NORM) + : -1; + + pulse_output_unlock(pm->output); + + return ret; +} + +static bool +pulse_mixer_set_volume(Mixer *mixer, unsigned volume, Error &error) +{ + PulseMixer *pm = (PulseMixer *) mixer; + struct pa_cvolume cvolume; + bool success; + + pulse_output_lock(pm->output); + + if (!pm->online) { + pulse_output_unlock(pm->output); + error.Set(pulse_mixer_domain, "disconnected"); + return false; + } + + pa_cvolume_set(&cvolume, pm->volume.channels, + (pa_volume_t)volume * PA_VOLUME_NORM / 100 + 0.5); + success = pulse_output_set_volume(pm->output, &cvolume, error); + if (success) + pm->volume = cvolume; + + pulse_output_unlock(pm->output); + + return success; +} + +const struct mixer_plugin pulse_mixer_plugin = { + pulse_mixer_init, + pulse_mixer_finish, + nullptr, + nullptr, + pulse_mixer_get_volume, + pulse_mixer_set_volume, + false, +}; |