1 files changed, 768 insertions, 0 deletions

diff --git a/src/output/JackOutputPlugin.cxx b/src/output/JackOutputPlugin.cxx
new file mode 100644
index 000000000..727fba13e
--- /dev/null
+++ b/src/output/JackOutputPlugin.cxx
@@ -0,0 +1,768 @@
+/*
+ * Copyright (C) 2003-2013 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 "JackOutputPlugin.hxx"
+#include "OutputAPI.hxx"
+#include "ConfigError.hxx"
+#include "util/Error.hxx"
+#include "util/Domain.hxx"
+
+#include <assert.h>
+
+#include <glib.h>
+#include <jack/jack.h>
+#include <jack/types.h>
+#include <jack/ringbuffer.h>
+
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <errno.h>
+
+#undef G_LOG_DOMAIN
+#define G_LOG_DOMAIN "jack"
+
+enum {
+	MAX_PORTS = 16,
+};
+
+static const size_t jack_sample_size = sizeof(jack_default_audio_sample_t);
+
+struct JackOutput {
+	struct audio_output base;
+
+	/**
+	 * libjack options passed to jack_client_open().
+	 */
+	jack_options_t options;
+
+	const char *name;
+
+	const char *server_name;
+
+	/* configuration */
+
+	char *source_ports[MAX_PORTS];
+	unsigned num_source_ports;
+
+	char *destination_ports[MAX_PORTS];
+	unsigned num_destination_ports;
+
+	size_t ringbuffer_size;
+
+	/* the current audio format */
+	AudioFormat audio_format;
+
+	/* jack library stuff */
+	jack_port_t *ports[MAX_PORTS];
+	jack_client_t *client;
+	jack_ringbuffer_t *ringbuffer[MAX_PORTS];
+
+	bool shutdown;
+
+	/**
+	 * While this flag is set, the "process" callback generates
+	 * silence.
+	 */
+	bool pause;
+
+	bool Initialize(const config_param &param, Error &error_r) {
+		return ao_base_init(&base, &jack_output_plugin, param,
+				    error_r);
+	}
+
+	void Deinitialize() {
+		ao_base_finish(&base);
+	}
+};
+
+static constexpr Domain jack_output_domain("jack_output");
+
+/**
+ * Determine the number of frames guaranteed to be available on all
+ * channels.
+ */
+static jack_nframes_t
+mpd_jack_available(const JackOutput *jd)
+{
+	size_t min = jack_ringbuffer_read_space(jd->ringbuffer[0]);
+
+	for (unsigned i = 1; i < jd->audio_format.channels; ++i) {
+		size_t current = jack_ringbuffer_read_space(jd->ringbuffer[i]);
+		if (current < min)
+			min = current;
+	}
+
+	assert(min % jack_sample_size == 0);
+
+	return min / jack_sample_size;
+}
+
+static int
+mpd_jack_process(jack_nframes_t nframes, void *arg)
+{
+	JackOutput *jd = (JackOutput *) arg;
+
+	if (nframes <= 0)
+		return 0;
+
+	if (jd->pause) {
+		/* empty the ring buffers */
+
+		const jack_nframes_t available = mpd_jack_available(jd);
+		for (unsigned i = 0; i < jd->audio_format.channels; ++i)
+			jack_ringbuffer_read_advance(jd->ringbuffer[i],
+						     available * jack_sample_size);
+
+		/* generate silence while MPD is paused */
+
+		for (unsigned i = 0; i < jd->audio_format.channels; ++i) {
+			jack_default_audio_sample_t *out =
+				(jack_default_audio_sample_t *)
+				jack_port_get_buffer(jd->ports[i], nframes);
+
+			for (jack_nframes_t f = 0; f < nframes; ++f)
+				out[f] = 0.0;
+		}
+
+		return 0;
+	}
+
+	jack_nframes_t available = mpd_jack_available(jd);
+	if (available > nframes)
+		available = nframes;
+
+	for (unsigned i = 0; i < jd->audio_format.channels; ++i) {
+		jack_default_audio_sample_t *out =
+			(jack_default_audio_sample_t *)
+			jack_port_get_buffer(jd->ports[i], nframes);
+		if (out == nullptr)
+			/* workaround for libjack1 bug: if the server
+			   connection fails, the process callback is
+			   invoked anyway, but unable to get a
+			   buffer */
+			continue;
+
+		jack_ringbuffer_read(jd->ringbuffer[i],
+				     (char *)out, available * jack_sample_size);
+
+		for (jack_nframes_t f = available; f < nframes; ++f)
+			/* ringbuffer underrun, fill with silence */
+			out[f] = 0.0;
+	}
+
+	/* generate silence for the unused source ports */
+
+	for (unsigned i = jd->audio_format.channels;
+	     i < jd->num_source_ports; ++i) {
+		jack_default_audio_sample_t *out =
+			(jack_default_audio_sample_t *)
+			jack_port_get_buffer(jd->ports[i], nframes);
+		if (out == nullptr)
+			/* workaround for libjack1 bug: if the server
+			   connection fails, the process callback is
+			   invoked anyway, but unable to get a
+			   buffer */
+			continue;
+
+		for (jack_nframes_t f = 0; f < nframes; ++f)
+			out[f] = 0.0;
+	}
+
+	return 0;
+}
+
+static void
+mpd_jack_shutdown(void *arg)
+{
+	JackOutput *jd = (JackOutput *) arg;
+	jd->shutdown = true;
+}
+
+static void
+set_audioformat(JackOutput *jd, AudioFormat &audio_format)
+{
+	audio_format.sample_rate = jack_get_sample_rate(jd->client);
+
+	if (jd->num_source_ports == 1)
+		audio_format.channels = 1;
+	else if (audio_format.channels > jd->num_source_ports)
+		audio_format.channels = 2;
+
+	if (audio_format.format != SampleFormat::S16 &&
+	    audio_format.format != SampleFormat::S24_P32)
+		audio_format.format = SampleFormat::S24_P32;
+}
+
+static void
+mpd_jack_error(const char *msg)
+{
+	g_warning("%s", msg);
+}
+
+#ifdef HAVE_JACK_SET_INFO_FUNCTION
+static void
+mpd_jack_info(const char *msg)
+{
+	g_message("%s", msg);
+}
+#endif
+
+/**
+ * Disconnect the JACK client.
+ */
+static void
+mpd_jack_disconnect(JackOutput *jd)
+{
+	assert(jd != nullptr);
+	assert(jd->client != nullptr);
+
+	jack_deactivate(jd->client);
+	jack_client_close(jd->client);
+	jd->client = nullptr;
+}
+
+/**
+ * Connect the JACK client and performs some basic setup
+ * (e.g. register callbacks).
+ */
+static bool
+mpd_jack_connect(JackOutput *jd, Error &error)
+{
+	jack_status_t status;
+
+	assert(jd != nullptr);
+
+	jd->shutdown = false;
+
+	jd->client = jack_client_open(jd->name, jd->options, &status,
+				      jd->server_name);
+	if (jd->client == nullptr) {
+		error.Format(jack_output_domain, status,
+			     "Failed to connect to JACK server, status=%d",
+			     status);
+		return false;
+	}
+
+	jack_set_process_callback(jd->client, mpd_jack_process, jd);
+	jack_on_shutdown(jd->client, mpd_jack_shutdown, jd);
+
+	for (unsigned i = 0; i < jd->num_source_ports; ++i) {
+		jd->ports[i] = jack_port_register(jd->client,
+						  jd->source_ports[i],
+						  JACK_DEFAULT_AUDIO_TYPE,
+						  JackPortIsOutput, 0);
+		if (jd->ports[i] == nullptr) {
+			error.Format(jack_output_domain,
+				     "Cannot register output port \"%s\"",
+				     jd->source_ports[i]);
+			mpd_jack_disconnect(jd);
+			return false;
+		}
+	}
+
+	return true;
+}
+
+static bool
+mpd_jack_test_default_device(void)
+{
+	return true;
+}
+
+static unsigned
+parse_port_list(const char *source, char **dest, Error &error)
+{
+	char **list = g_strsplit(source, ",", 0);
+	unsigned n = 0;
+
+	for (n = 0; list[n] != nullptr; ++n) {
+		if (n >= MAX_PORTS) {
+			error.Set(config_domain,
+				  "too many port names");
+			return 0;
+		}
+
+		dest[n] = list[n];
+	}
+
+	g_free(list);
+
+	if (n == 0) {
+		error.Format(config_domain,
+			     "at least one port name expected");
+		return 0;
+	}
+
+	return n;
+}
+
+static struct audio_output *
+mpd_jack_init(const config_param &param, Error &error)
+{
+	JackOutput *jd = new JackOutput();
+
+	if (!jd->Initialize(param, error)) {
+		delete jd;
+		return nullptr;
+	}
+
+	const char *value;
+
+	jd->options = JackNullOption;
+
+	jd->name = param.GetBlockValue("client_name", nullptr);
+	if (jd->name != nullptr)
+		jd->options = jack_options_t(jd->options | JackUseExactName);
+	else
+		/* if there's a no configured client name, we don't
+		   care about the JackUseExactName option */
+		jd->name = "Music Player Daemon";
+
+	jd->server_name = param.GetBlockValue("server_name", nullptr);
+	if (jd->server_name != nullptr)
+		jd->options = jack_options_t(jd->options | JackServerName);
+
+	if (!param.GetBlockValue("autostart", false))
+		jd->options = jack_options_t(jd->options | JackNoStartServer);
+
+	/* configure the source ports */
+
+	value = param.GetBlockValue("source_ports", "left,right");
+	jd->num_source_ports = parse_port_list(value,
+					       jd->source_ports, error);
+	if (jd->num_source_ports == 0)
+		return nullptr;
+
+	/* configure the destination ports */
+
+	value = param.GetBlockValue("destination_ports", nullptr);
+	if (value == nullptr) {
+		/* compatibility with MPD < 0.16 */
+		value = param.GetBlockValue("ports", nullptr);
+		if (value != nullptr)
+			g_warning("deprecated option 'ports' in line %d",
+				  param.line);
+	}
+
+	if (value != nullptr) {
+		jd->num_destination_ports =
+			parse_port_list(value,
+					jd->destination_ports, error);
+		if (jd->num_destination_ports == 0)
+			return nullptr;
+	} else {
+		jd->num_destination_ports = 0;
+	}
+
+	if (jd->num_destination_ports > 0 &&
+	    jd->num_destination_ports != jd->num_source_ports)
+		g_warning("number of source ports (%u) mismatches the "
+			  "number of destination ports (%u) in line %d",
+			  jd->num_source_ports, jd->num_destination_ports,
+			  param.line);
+
+	jd->ringbuffer_size = param.GetBlockValue("ringbuffer_size", 32768u);
+
+	jack_set_error_function(mpd_jack_error);
+
+#ifdef HAVE_JACK_SET_INFO_FUNCTION
+	jack_set_info_function(mpd_jack_info);
+#endif
+
+	return &jd->base;
+}
+
+static void
+mpd_jack_finish(struct audio_output *ao)
+{
+	JackOutput *jd = (JackOutput *)ao;
+
+	for (unsigned i = 0; i < jd->num_source_ports; ++i)
+		g_free(jd->source_ports[i]);
+
+	for (unsigned i = 0; i < jd->num_destination_ports; ++i)
+		g_free(jd->destination_ports[i]);
+
+	jd->Deinitialize();
+	delete jd;
+}
+
+static bool
+mpd_jack_enable(struct audio_output *ao, Error &error)
+{
+	JackOutput *jd = (JackOutput *)ao;
+
+	for (unsigned i = 0; i < jd->num_source_ports; ++i)
+		jd->ringbuffer[i] = nullptr;
+
+	return mpd_jack_connect(jd, error);
+}
+
+static void
+mpd_jack_disable(struct audio_output *ao)
+{
+	JackOutput *jd = (JackOutput *)ao;
+
+	if (jd->client != nullptr)
+		mpd_jack_disconnect(jd);
+
+	for (unsigned i = 0; i < jd->num_source_ports; ++i) {
+		if (jd->ringbuffer[i] != nullptr) {
+			jack_ringbuffer_free(jd->ringbuffer[i]);
+			jd->ringbuffer[i] = nullptr;
+		}
+	}
+}
+
+/**
+ * Stops the playback on the JACK connection.
+ */
+static void
+mpd_jack_stop(JackOutput *jd)
+{
+	assert(jd != nullptr);
+
+	if (jd->client == nullptr)
+		return;
+
+	if (jd->shutdown)
+		/* the connection has failed; close it */
+		mpd_jack_disconnect(jd);
+	else
+		/* the connection is alive: just stop playback */
+		jack_deactivate(jd->client);
+}
+
+static bool
+mpd_jack_start(JackOutput *jd, Error &error)
+{
+	const char *destination_ports[MAX_PORTS], **jports;
+	const char *duplicate_port = nullptr;
+	unsigned num_destination_ports;
+
+	assert(jd->client != nullptr);
+	assert(jd->audio_format.channels <= jd->num_source_ports);
+
+	/* allocate the ring buffers on the first open(); these
+	   persist until MPD exits.  It's too unsafe to delete them
+	   because we can never know when mpd_jack_process() gets
+	   called */
+	for (unsigned i = 0; i < jd->num_source_ports; ++i) {
+		if (jd->ringbuffer[i] == nullptr)
+			jd->ringbuffer[i] =
+				jack_ringbuffer_create(jd->ringbuffer_size);
+
+		/* clear the ring buffer to be sure that data from
+		   previous playbacks are gone */
+		jack_ringbuffer_reset(jd->ringbuffer[i]);
+	}
+
+	if ( jack_activate(jd->client) ) {
+		error.Set(jack_output_domain, "cannot activate client");
+		mpd_jack_stop(jd);
+		return false;
+	}
+
+	if (jd->num_destination_ports == 0) {
+		/* no output ports were configured - ask libjack for
+		   defaults */
+		jports = jack_get_ports(jd->client, nullptr, nullptr,
+					JackPortIsPhysical | JackPortIsInput);
+		if (jports == nullptr) {
+			error.Set(jack_output_domain, "no ports found");
+			mpd_jack_stop(jd);
+			return false;
+		}
+
+		assert(*jports != nullptr);
+
+		for (num_destination_ports = 0;
+		     num_destination_ports < MAX_PORTS &&
+			     jports[num_destination_ports] != nullptr;
+		     ++num_destination_ports) {
+			g_debug("destination_port[%u] = '%s'\n",
+				num_destination_ports,
+				jports[num_destination_ports]);
+			destination_ports[num_destination_ports] =
+				jports[num_destination_ports];
+		}
+	} else {
+		/* use the configured output ports */
+
+		num_destination_ports = jd->num_destination_ports;
+		memcpy(destination_ports, jd->destination_ports,
+		       num_destination_ports * sizeof(*destination_ports));
+
+		jports = nullptr;
+	}
+
+	assert(num_destination_ports > 0);
+
+	if (jd->audio_format.channels >= 2 && num_destination_ports == 1) {
+		/* mix stereo signal on one speaker */
+
+		while (num_destination_ports < jd->audio_format.channels)
+			destination_ports[num_destination_ports++] =
+				destination_ports[0];
+	} else if (num_destination_ports > jd->audio_format.channels) {
+		if (jd->audio_format.channels == 1 && num_destination_ports > 2) {
+			/* mono input file: connect the one source
+			   channel to the both destination channels */
+			duplicate_port = destination_ports[1];
+			num_destination_ports = 1;
+		} else
+			/* connect only as many ports as we need */
+			num_destination_ports = jd->audio_format.channels;
+	}
+
+	assert(num_destination_ports <= jd->num_source_ports);
+
+	for (unsigned i = 0; i < num_destination_ports; ++i) {
+		int ret;
+
+		ret = jack_connect(jd->client, jack_port_name(jd->ports[i]),
+				   destination_ports[i]);
+		if (ret != 0) {
+			error.Format(jack_output_domain,
+				     "Not a valid JACK port: %s",
+				     destination_ports[i]);
+
+			if (jports != nullptr)
+				free(jports);
+
+			mpd_jack_stop(jd);
+			return false;
+		}
+	}
+
+	if (duplicate_port != nullptr) {
+		/* mono input file: connect the one source channel to
+		   the both destination channels */
+		int ret;
+
+		ret = jack_connect(jd->client, jack_port_name(jd->ports[0]),
+				   duplicate_port);
+		if (ret != 0) {
+			error.Format(jack_output_domain,
+				     "Not a valid JACK port: %s",
+				     duplicate_port);
+
+			if (jports != nullptr)
+				free(jports);
+
+			mpd_jack_stop(jd);
+			return false;
+		}
+	}
+
+	if (jports != nullptr)
+		free(jports);
+
+	return true;
+}
+
+static bool
+mpd_jack_open(struct audio_output *ao, AudioFormat &audio_format,
+	      Error &error)
+{
+	JackOutput *jd = (JackOutput *)ao;
+
+	assert(jd != nullptr);
+
+	jd->pause = false;
+
+	if (jd->client != nullptr && jd->shutdown)
+		mpd_jack_disconnect(jd);
+
+	if (jd->client == nullptr && !mpd_jack_connect(jd, error))
+		return false;
+
+	set_audioformat(jd, audio_format);
+	jd->audio_format = audio_format;
+
+	if (!mpd_jack_start(jd, error))
+		return false;
+
+	return true;
+}
+
+static void
+mpd_jack_close(gcc_unused struct audio_output *ao)
+{
+	JackOutput *jd = (JackOutput *)ao;
+
+	mpd_jack_stop(jd);
+}
+
+static unsigned
+mpd_jack_delay(struct audio_output *ao)
+{
+	JackOutput *jd = (JackOutput *)ao;
+
+	return jd->base.pause && jd->pause && !jd->shutdown
+		? 1000
+		: 0;
+}
+
+static inline jack_default_audio_sample_t
+sample_16_to_jack(int16_t sample)
+{
+	return sample / (jack_default_audio_sample_t)(1 << (16 - 1));
+}
+
+static void
+mpd_jack_write_samples_16(JackOutput *jd, const int16_t *src,
+			  unsigned num_samples)
+{
+	jack_default_audio_sample_t sample;
+	unsigned i;
+
+	while (num_samples-- > 0) {
+		for (i = 0; i < jd->audio_format.channels; ++i) {
+			sample = sample_16_to_jack(*src++);
+			jack_ringbuffer_write(jd->ringbuffer[i],
+					      (const char *)&sample,
+					      sizeof(sample));
+		}
+	}
+}
+
+static inline jack_default_audio_sample_t
+sample_24_to_jack(int32_t sample)
+{
+	return sample / (jack_default_audio_sample_t)(1 << (24 - 1));
+}
+
+static void
+mpd_jack_write_samples_24(JackOutput *jd, const int32_t *src,
+			  unsigned num_samples)
+{
+	jack_default_audio_sample_t sample;
+	unsigned i;
+
+	while (num_samples-- > 0) {
+		for (i = 0; i < jd->audio_format.channels; ++i) {
+			sample = sample_24_to_jack(*src++);
+			jack_ringbuffer_write(jd->ringbuffer[i],
+					      (const char *)&sample,
+					      sizeof(sample));
+		}
+	}
+}
+
+static void
+mpd_jack_write_samples(JackOutput *jd, const void *src,
+		       unsigned num_samples)
+{
+	switch (jd->audio_format.format) {
+	case SampleFormat::S16:
+		mpd_jack_write_samples_16(jd, (const int16_t*)src,
+					  num_samples);
+		break;
+
+	case SampleFormat::S24_P32:
+		mpd_jack_write_samples_24(jd, (const int32_t*)src,
+					  num_samples);
+		break;
+
+	default:
+		assert(false);
+		gcc_unreachable();
+	}
+}
+
+static size_t
+mpd_jack_play(struct audio_output *ao, const void *chunk, size_t size,
+	      Error &error)
+{
+	JackOutput *jd = (JackOutput *)ao;
+	const size_t frame_size = jd->audio_format.GetFrameSize();
+	size_t space = 0, space1;
+
+	jd->pause = false;
+
+	assert(size % frame_size == 0);
+	size /= frame_size;
+
+	while (true) {
+		if (jd->shutdown) {
+			error.Set(jack_output_domain,
+				  "Refusing to play, because "
+				  "there is no client thread");
+			return 0;
+		}
+
+		space = jack_ringbuffer_write_space(jd->ringbuffer[0]);
+		for (unsigned i = 1; i < jd->audio_format.channels; ++i) {
+			space1 = jack_ringbuffer_write_space(jd->ringbuffer[i]);
+			if (space > space1)
+				/* send data symmetrically */
+				space = space1;
+		}
+
+		if (space >= jack_sample_size)
+			break;
+
+		/* XXX do something more intelligent to
+		   synchronize */
+		g_usleep(1000);
+	}
+
+	space /= jack_sample_size;
+	if (space < size)
+		size = space;
+
+	mpd_jack_write_samples(jd, chunk, size);
+	return size * frame_size;
+}
+
+static bool
+mpd_jack_pause(struct audio_output *ao)
+{
+	JackOutput *jd = (JackOutput *)ao;
+
+	if (jd->shutdown)
+		return false;
+
+	jd->pause = true;
+
+	return true;
+}
+
+const struct audio_output_plugin jack_output_plugin = {
+	"jack",
+	mpd_jack_test_default_device,
+	mpd_jack_init,
+	mpd_jack_finish,
+	mpd_jack_enable,
+	mpd_jack_disable,
+	mpd_jack_open,
+	mpd_jack_close,
+	mpd_jack_delay,
+	nullptr,
+	mpd_jack_play,
+	nullptr,
+	nullptr,
+	mpd_jack_pause,
+	nullptr,
+};