pulse: code rewrite using the asynchronous libpulse API
This is a complete rewrite of the PulseAudio output plugin. It uses the asynchronous API, which gives us more control over everything. Additionally, it connects to the PulseAudio server on startup, and keeps this connection up while MPD runs. During pause, instead of closing the stream, it enables "cork".
This commit is contained in:
Max Kellermann
@@ -18,12 +18,20 @@
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*/
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#include "mixer_api.h"
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#include "output/pulse_output_plugin.h"
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#include "conf.h"
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#include "event_pipe.h"
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#include <glib.h>
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#include <pulse/volume.h>
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#include <pulse/pulseaudio.h>
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#include <pulse/thread-mainloop.h>
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#include <pulse/context.h>
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#include <pulse/introspect.h>
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#include <pulse/stream.h>
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#include <pulse/subscribe.h>
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#include <pulse/error.h>
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#include <assert.h>
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#include <string.h>
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#undef G_LOG_DOMAIN
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@@ -32,15 +40,9 @@
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struct pulse_mixer {
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struct mixer base;
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const char *server;
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const char *sink;
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const char *output_name;
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struct pulse_output *output;
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uint32_t index;
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bool online;
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struct pa_context *context;
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struct pa_threaded_mainloop *mainloop;
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struct pa_cvolume volume;
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};
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@@ -54,175 +56,159 @@ pulse_mixer_quark(void)
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return g_quark_from_static_string("pulse_mixer");
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}
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static void
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pulse_mixer_offline(struct pulse_mixer *pm)
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{
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if (!pm->online)
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return;
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pm->online = false;
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event_pipe_emit(PIPE_EVENT_MIXER);
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}
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/**
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* \brief waits for a pulseaudio operation to finish, frees it and
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* unlocks the mainloop
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* \param operation the operation to wait for
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* \return true if operation has finished normally (DONE state),
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* false otherwise
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* Callback invoked by pulse_mixer_update(). Receives the new mixer
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* value.
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*/
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static bool
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pulse_wait_for_operation(struct pa_threaded_mainloop *mainloop,
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struct pa_operation *operation)
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{
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pa_operation_state_t state;
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assert(mainloop != NULL);
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assert(operation != NULL);
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state = pa_operation_get_state(operation);
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while (state == PA_OPERATION_RUNNING) {
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pa_threaded_mainloop_wait(mainloop);
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state = pa_operation_get_state(operation);
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}
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pa_operation_unref(operation);
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return state == PA_OPERATION_DONE;
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}
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static void
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sink_input_cb(G_GNUC_UNUSED pa_context *context, const pa_sink_input_info *i,
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int eol, void *userdata)
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pulse_mixer_volume_cb(G_GNUC_UNUSED pa_context *context, const pa_sink_input_info *i,
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int eol, void *userdata)
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{
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struct pulse_mixer *pm = userdata;
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if (eol) {
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g_debug("eol error sink_input_cb");
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if (eol)
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return;
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}
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if (i == NULL) {
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g_debug("Sink input callback failure");
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pulse_mixer_offline(pm);
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return;
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}
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g_debug("sink input cb %s, index %d ",i->name,i->index);
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if (strcmp(i->name,pm->output_name) == 0) {
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pm->index = i->index;
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pm->online = true;
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pm->volume = i->volume;
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} else
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g_debug("bad name");
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}
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static void
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sink_input_vol(G_GNUC_UNUSED pa_context *context, const pa_sink_input_info *i,
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int eol, void *userdata)
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{
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struct pulse_mixer *pm = userdata;
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if (eol) {
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g_debug("eol error sink_input_vol");
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return;
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}
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if (i == NULL) {
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g_debug("Sink input callback failure");
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return;
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}
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g_debug("sink input vol %s, index %d ", i->name, i->index);
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pm->online = true;
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pm->volume = i->volume;
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pa_threaded_mainloop_signal(pm->mainloop, 0);
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event_pipe_emit(PIPE_EVENT_MIXER);
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}
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static void
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subscribe_cb(pa_context *c, pa_subscription_event_type_t t,
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pulse_mixer_update(struct pulse_mixer *pm)
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{
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pa_operation *o;
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assert(pm->output->stream != NULL);
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if (pm->output->context == NULL)
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return;
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o = pa_context_get_sink_input_info(pm->output->context,
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pa_stream_get_index(pm->output->stream),
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pulse_mixer_volume_cb, pm);
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if (o == NULL) {
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g_warning("pa_context_get_sink_input_info() failed: %s",
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pa_strerror(pa_context_errno(pm->output->context)));
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pulse_mixer_offline(pm);
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return;
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}
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pa_operation_unref(o);
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}
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static void
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pulse_mixer_handle_sink_input(struct pulse_mixer *pm,
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pa_subscription_event_type_t t,
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uint32_t idx)
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{
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if (pm->output->stream == NULL) {
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pulse_mixer_offline(pm);
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return;
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}
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if (idx != pa_stream_get_index(pm->output->stream))
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return;
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if (t == PA_SUBSCRIPTION_EVENT_NEW ||
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t == PA_SUBSCRIPTION_EVENT_CHANGE)
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pulse_mixer_update(pm);
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}
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static void
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pulse_mixer_subscribe_cb(G_GNUC_UNUSED pa_context *c, pa_subscription_event_type_t t,
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uint32_t idx, void *userdata)
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{
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struct pulse_mixer *pm = userdata;
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g_debug("subscribe call back");
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switch (t & PA_SUBSCRIPTION_EVENT_FACILITY_MASK) {
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case PA_SUBSCRIPTION_EVENT_SINK_INPUT:
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if ((t & PA_SUBSCRIPTION_EVENT_TYPE_MASK) ==
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PA_SUBSCRIPTION_EVENT_REMOVE &&
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pm->index == idx)
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pm->online = false;
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else {
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pa_operation *o;
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o = pa_context_get_sink_input_info(c, idx,
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sink_input_cb, pm);
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if (o == NULL) {
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g_debug("pa_context_get_sink_input_info() failed");
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return;
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}
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pa_operation_unref(o);
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}
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pulse_mixer_handle_sink_input(pm,
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t & PA_SUBSCRIPTION_EVENT_TYPE_MASK,
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idx);
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break;
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}
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}
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static void
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context_state_cb(pa_context *context, void *userdata)
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pulxe_mixer_context_state_cb(pa_context *context, void *userdata)
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{
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struct pulse_mixer *pm = userdata;
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pa_operation *o;
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switch (pa_context_get_state(context)) {
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case PA_CONTEXT_READY: {
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pa_operation *o;
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/* pass event to the output's callback function */
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pulse_output_context_state_cb(context, pm->output);
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pa_context_set_subscribe_callback(context, subscribe_cb, pm);
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if (pa_context_get_state(context) == PA_CONTEXT_READY) {
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/* subscribe to sink_input events after the connection
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has been established */
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o = pa_context_subscribe(context,
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(pa_subscription_mask_t)PA_SUBSCRIPTION_MASK_SINK_INPUT,
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NULL, NULL);
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if (o == NULL) {
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g_debug("pa_context_subscribe() failed");
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g_warning("pa_context_subscribe() failed: %s",
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pa_strerror(pa_context_errno(context)));
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return;
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}
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pa_operation_unref(o);
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o = pa_context_get_sink_input_info_list(context,
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sink_input_cb, pm);
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if (o == NULL) {
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g_debug("pa_context_get_sink_input_info_list() failed");
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return;
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}
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pa_operation_unref(o);
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pa_threaded_mainloop_signal(pm->mainloop, 0);
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break;
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}
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case PA_CONTEXT_UNCONNECTED:
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case PA_CONTEXT_CONNECTING:
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case PA_CONTEXT_AUTHORIZING:
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case PA_CONTEXT_SETTING_NAME:
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break;
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case PA_CONTEXT_TERMINATED:
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case PA_CONTEXT_FAILED:
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pa_threaded_mainloop_signal(pm->mainloop, 0);
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break;
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if (pm->output->stream != NULL)
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pulse_mixer_update(pm);
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}
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}
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static struct mixer *
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pulse_mixer_init(G_GNUC_UNUSED void *ao, const struct config_param *param,
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G_GNUC_UNUSED GError **error_r)
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pulse_mixer_init(void *ao, G_GNUC_UNUSED const struct config_param *param,
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GError **error_r)
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{
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struct pulse_mixer *pm = g_new(struct pulse_mixer,1);
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struct pulse_mixer *pm;
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if (ao == NULL) {
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g_set_error(error_r, pulse_mixer_quark(), 0,
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"The pulse mixer cannot work without the audio output");
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return false;
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}
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pm = g_new(struct pulse_mixer,1);
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mixer_init(&pm->base, &pulse_mixer_plugin);
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pm->output = ao;
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pm->online = false;
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pm->server = config_get_block_string(param, "server", NULL);
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pm->sink = config_get_block_string(param, "sink", NULL);
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pm->output_name = config_get_block_string(param, "name", NULL);
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pa_threaded_mainloop_lock(pm->output->mainloop);
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/* register callbacks (override the output's context state
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callback) */
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pa_context_set_state_callback(pm->output->context,
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pulxe_mixer_context_state_cb, pm);
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pa_context_set_subscribe_callback(pm->output->context,
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pulse_mixer_subscribe_cb, pm);
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/* check the current state now (we might have missed the first
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events!) */
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pulxe_mixer_context_state_cb(pm->output->context, pm);
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pa_threaded_mainloop_unlock(pm->output->mainloop);
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return &pm->base;
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}
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@@ -232,79 +218,35 @@ pulse_mixer_finish(struct mixer *data)
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{
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struct pulse_mixer *pm = (struct pulse_mixer *) data;
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/* restore callbacks */
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pa_threaded_mainloop_lock(pm->output->mainloop);
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if (pm->output->context != NULL) {
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pa_context_set_state_callback(pm->output->context,
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pulse_output_context_state_cb,
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pm->output);
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pa_context_set_subscribe_callback(pm->output->context,
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NULL, NULL);
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}
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pa_threaded_mainloop_unlock(pm->output->mainloop);
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/* free resources */
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g_free(pm);
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}
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static bool
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pulse_mixer_setup(struct pulse_mixer *pm, GError **error_r)
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{
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pa_context_set_state_callback(pm->context, context_state_cb, pm);
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if (pa_context_connect(pm->context, pm->server,
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(pa_context_flags_t)0, NULL) < 0) {
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g_set_error(error_r, pulse_mixer_quark(), 0,
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"pa_context_connect() has failed");
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return false;
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}
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pa_threaded_mainloop_lock(pm->mainloop);
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if (pa_threaded_mainloop_start(pm->mainloop) < 0) {
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pa_threaded_mainloop_unlock(pm->mainloop);
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g_set_error(error_r, pulse_mixer_quark(), 0,
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"pa_threaded_mainloop_start() has failed");
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return false;
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}
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pa_threaded_mainloop_wait(pm->mainloop);
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if (pa_context_get_state(pm->context) != PA_CONTEXT_READY) {
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g_set_error(error_r, pulse_mixer_quark(), 0,
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"failed to connect: %s",
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pa_strerror(pa_context_errno(pm->context)));
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pa_threaded_mainloop_unlock(pm->mainloop);
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return false;
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}
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pa_threaded_mainloop_unlock(pm->mainloop);
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return true;
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}
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static bool
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pulse_mixer_open(struct mixer *data, GError **error_r)
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pulse_mixer_open(struct mixer *data, G_GNUC_UNUSED GError **error_r)
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{
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struct pulse_mixer *pm = (struct pulse_mixer *) data;
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g_debug("pulse mixer open");
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pm->index = 0;
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pm->online = false;
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pm->mainloop = pa_threaded_mainloop_new();
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if (pm->mainloop == NULL) {
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g_set_error(error_r, pulse_mixer_quark(), 0,
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"pa_threaded_mainloop_new() has failed");
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return false;
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}
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pm->context = pa_context_new(pa_threaded_mainloop_get_api(pm->mainloop),
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"Mixer mpd");
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if (pm->context == NULL) {
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pa_threaded_mainloop_stop(pm->mainloop);
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pa_threaded_mainloop_free(pm->mainloop);
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g_set_error(error_r, pulse_mixer_quark(), 0,
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"pa_context_new() has failed");
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return false;
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}
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if (!pulse_mixer_setup(pm, error_r)) {
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pa_threaded_mainloop_stop(pm->mainloop);
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pa_context_disconnect(pm->context);
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pa_context_unref(pm->context);
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pa_threaded_mainloop_free(pm->mainloop);
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return false;
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}
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pa_threaded_mainloop_lock(pm->output->mainloop);
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if (pm->output->stream != NULL &&
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pa_stream_get_state(pm->output->stream) == PA_STREAM_READY)
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pulse_mixer_update(pm);
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pa_threaded_mainloop_unlock(pm->output->mainloop);
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return true;
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}
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@@ -314,49 +256,22 @@ pulse_mixer_close(struct mixer *data)
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{
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struct pulse_mixer *pm = (struct pulse_mixer *) data;
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pa_threaded_mainloop_stop(pm->mainloop);
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pa_context_disconnect(pm->context);
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pa_context_unref(pm->context);
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pa_threaded_mainloop_free(pm->mainloop);
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pm->online = false;
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pulse_mixer_offline(pm);
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}
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static int
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pulse_mixer_get_volume(struct mixer *mixer, GError **error_r)
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pulse_mixer_get_volume(struct mixer *mixer, G_GNUC_UNUSED GError **error_r)
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{
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struct pulse_mixer *pm = (struct pulse_mixer *) mixer;
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int ret;
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pa_operation *o;
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pa_threaded_mainloop_lock(pm->mainloop);
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if (!pm->online) {
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pa_threaded_mainloop_unlock(pm->mainloop);
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return false;
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}
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o = pa_context_get_sink_input_info(pm->context, pm->index,
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sink_input_vol, pm);
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if (o == NULL) {
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pa_threaded_mainloop_unlock(pm->mainloop);
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g_set_error(error_r, pulse_mixer_quark(), 0,
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"pa_context_get_sink_input_info() has failed");
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return false;
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}
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if (!pulse_wait_for_operation(pm->mainloop, o)) {
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pa_threaded_mainloop_unlock(pm->mainloop);
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g_set_error(error_r, pulse_mixer_quark(), 0,
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"failed to read PulseAudio volume");
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return false;
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}
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pa_threaded_mainloop_lock(pm->output->mainloop);
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ret = pm->online
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? (int)((100*(pa_cvolume_avg(&pm->volume)+1))/PA_VOLUME_NORM)
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: -1;
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pa_threaded_mainloop_unlock(pm->mainloop);
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pa_threaded_mainloop_unlock(pm->output->mainloop);
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return ret;
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}
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@@ -368,10 +283,11 @@ pulse_mixer_set_volume(struct mixer *mixer, unsigned volume, GError **error_r)
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struct pa_cvolume cvolume;
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pa_operation *o;
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pa_threaded_mainloop_lock(pm->mainloop);
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pa_threaded_mainloop_lock(pm->output->mainloop);
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if (!pm->online) {
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pa_threaded_mainloop_unlock(pm->mainloop);
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if (!pm->online || pm->output->stream == NULL ||
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pm->output->context == NULL) {
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pa_threaded_mainloop_unlock(pm->output->mainloop);
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g_set_error(error_r, pulse_mixer_quark(), 0, "disconnected");
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return false;
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}
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@@ -379,9 +295,10 @@ pulse_mixer_set_volume(struct mixer *mixer, unsigned volume, GError **error_r)
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pa_cvolume_set(&cvolume, pm->volume.channels,
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(pa_volume_t)volume * PA_VOLUME_NORM / 100 + 0.5);
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o = pa_context_set_sink_input_volume(pm->context, pm->index,
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o = pa_context_set_sink_input_volume(pm->output->context,
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pa_stream_get_index(pm->output->stream),
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&cvolume, NULL, NULL);
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pa_threaded_mainloop_unlock(pm->mainloop);
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pa_threaded_mainloop_unlock(pm->output->mainloop);
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if (o == NULL) {
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g_set_error(error_r, pulse_mixer_quark(), 0,
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"failed to set PulseAudio volume");
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