aboutsummaryrefslogtreecommitdiffstats
path: root/src/output/jack_output_plugin.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/output/jack_output_plugin.c')
-rw-r--r--src/output/jack_output_plugin.c543
1 files changed, 543 insertions, 0 deletions
diff --git a/src/output/jack_output_plugin.c b/src/output/jack_output_plugin.c
new file mode 100644
index 000000000..fba921e04
--- /dev/null
+++ b/src/output/jack_output_plugin.c
@@ -0,0 +1,543 @@
+/*
+ * Copyright (C) 2003-2009 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 "output_api.h"
+#include "config.h"
+
+#include <assert.h>
+
+#include <glib.h>
+#include <jack/jack.h>
+#include <jack/types.h>
+#include <jack/ringbuffer.h>
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <errno.h>
+
+#undef G_LOG_DOMAIN
+#define G_LOG_DOMAIN "jack"
+
+static const size_t sample_size = sizeof(jack_default_audio_sample_t);
+
+static const char *const port_names[2] = {
+ "left", "right",
+};
+
+struct jack_data {
+ const char *name;
+
+ /* configuration */
+ char *output_ports[2];
+ size_t ringbuffer_size;
+
+ /* the current audio format */
+ struct audio_format audio_format;
+
+ /* jack library stuff */
+ jack_port_t *ports[2];
+ jack_client_t *client;
+ jack_ringbuffer_t *ringbuffer[2];
+
+ bool shutdown;
+
+ /**
+ * While this flag is set, the "process" callback generates
+ * silence.
+ */
+ bool pause;
+};
+
+/**
+ * The quark used for GError.domain.
+ */
+static inline GQuark
+jack_output_quark(void)
+{
+ return g_quark_from_static_string("jack_output");
+}
+
+static int
+mpd_jack_process(jack_nframes_t nframes, void *arg)
+{
+ struct jack_data *jd = (struct jack_data *) arg;
+ jack_default_audio_sample_t *out;
+ size_t available;
+
+ if (nframes <= 0)
+ return 0;
+
+ if (jd->pause) {
+ /* generate silence while MPD is paused */
+
+ for (unsigned i = 0; i < G_N_ELEMENTS(jd->ringbuffer); ++i) {
+ out = jack_port_get_buffer(jd->ports[i], nframes);
+
+ for (jack_nframes_t f = 0; f < nframes; ++f)
+ out[f] = 0.0;
+ }
+
+ return 0;
+ }
+
+ for (unsigned i = 0; i < G_N_ELEMENTS(jd->ringbuffer); ++i) {
+ available = jack_ringbuffer_read_space(jd->ringbuffer[i]);
+ assert(available % sample_size == 0);
+ available /= sample_size;
+ if (available > nframes)
+ available = nframes;
+
+ out = jack_port_get_buffer(jd->ports[i], nframes);
+ jack_ringbuffer_read(jd->ringbuffer[i],
+ (char *)out, available * sample_size);
+
+ while (available < nframes)
+ /* ringbuffer underrun, fill with silence */
+ out[available++] = 0.0;
+ }
+
+ return 0;
+}
+
+static void
+mpd_jack_shutdown(void *arg)
+{
+ struct jack_data *jd = (struct jack_data *) arg;
+ jd->shutdown = true;
+}
+
+static void
+set_audioformat(struct jack_data *jd, struct audio_format *audio_format)
+{
+ audio_format->sample_rate = jack_get_sample_rate(jd->client);
+ audio_format->channels = 2;
+
+ if (audio_format->bits != 16 && audio_format->bits != 24)
+ audio_format->bits = 24;
+}
+
+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(struct jack_data *jd)
+{
+ assert(jd != NULL);
+ assert(jd->client != NULL);
+
+ jack_deactivate(jd->client);
+ jack_client_close(jd->client);
+ jd->client = NULL;
+}
+
+/**
+ * Connect the JACK client and performs some basic setup
+ * (e.g. register callbacks).
+ */
+static bool
+mpd_jack_connect(struct jack_data *jd, GError **error_r)
+{
+ assert(jd != NULL);
+
+ jd->shutdown = false;
+
+ if ((jd->client = jack_client_new(jd->name)) == NULL) {
+ g_set_error(error_r, jack_output_quark(), 0,
+ "Failed to connect to JACK server");
+ 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 < G_N_ELEMENTS(jd->ports); ++i) {
+ jd->ports[i] = jack_port_register(jd->client, port_names[i],
+ JACK_DEFAULT_AUDIO_TYPE,
+ JackPortIsOutput, 0);
+ if (jd->ports[i] == NULL) {
+ g_set_error(error_r, jack_output_quark(), 0,
+ "Cannot register output port \"%s\"",
+ port_names[i]);
+ mpd_jack_disconnect(jd);
+ return false;
+ }
+ }
+
+ return true;
+}
+
+static bool
+mpd_jack_test_default_device(void)
+{
+ return true;
+}
+
+static void *
+mpd_jack_init(G_GNUC_UNUSED const struct audio_format *audio_format,
+ const struct config_param *param, GError **error_r)
+{
+ struct jack_data *jd;
+ const char *value;
+
+ jd = g_new(struct jack_data, 1);
+ jd->name = config_get_block_string(param, "name", "mpd_jack");
+
+ g_debug("mpd_jack_init (pid=%d)", getpid());
+
+ value = config_get_block_string(param, "ports", NULL);
+ if (value != NULL) {
+ char **ports = g_strsplit(value, ",", 0);
+
+ if (ports[0] == NULL || ports[1] == NULL || ports[2] != NULL) {
+ g_set_error(error_r, jack_output_quark(), 0,
+ "two port names expected in line %d",
+ param->line);
+ return NULL;
+ }
+
+ jd->output_ports[0] = ports[0];
+ jd->output_ports[1] = ports[1];
+
+ g_free(ports);
+ } else {
+ jd->output_ports[0] = NULL;
+ jd->output_ports[1] = NULL;
+ }
+
+ jd->ringbuffer_size =
+ config_get_block_unsigned(param, "ringbuffer_size", 32768);
+
+ jack_set_error_function(mpd_jack_error);
+
+#ifdef HAVE_JACK_SET_INFO_FUNCTION
+ jack_set_info_function(mpd_jack_info);
+#endif
+
+ return jd;
+}
+
+static void
+mpd_jack_finish(void *data)
+{
+ struct jack_data *jd = data;
+
+ for (unsigned i = 0; i < G_N_ELEMENTS(jd->output_ports); ++i)
+ g_free(jd->output_ports[i]);
+
+ g_free(jd);
+}
+
+static bool
+mpd_jack_enable(void *data, GError **error_r)
+{
+ struct jack_data *jd = (struct jack_data *)data;
+
+ for (unsigned i = 0; i < G_N_ELEMENTS(jd->ringbuffer); ++i)
+ jd->ringbuffer[i] = NULL;
+
+ return mpd_jack_connect(jd, error_r);
+}
+
+static void
+mpd_jack_disable(void *data)
+{
+ struct jack_data *jd = (struct jack_data *)data;
+
+ if (jd->client != NULL)
+ mpd_jack_disconnect(jd);
+
+ for (unsigned i = 0; i < G_N_ELEMENTS(jd->ringbuffer); ++i) {
+ if (jd->ringbuffer[i] != NULL) {
+ jack_ringbuffer_free(jd->ringbuffer[i]);
+ jd->ringbuffer[i] = NULL;
+ }
+ }
+}
+
+/**
+ * Stops the playback on the JACK connection.
+ */
+static void
+mpd_jack_stop(struct jack_data *jd)
+{
+ assert(jd != NULL);
+
+ if (jd->client == NULL)
+ 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(struct jack_data *jd, GError **error_r)
+{
+ const char *output_ports[2], **jports;
+
+ if (jd->client == NULL && !mpd_jack_connect(jd, error_r))
+ return false;
+
+ /* 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 < G_N_ELEMENTS(jd->ringbuffer); ++i)
+ if (jd->ringbuffer[i] == NULL)
+ jd->ringbuffer[i] =
+ jack_ringbuffer_create(jd->ringbuffer_size);
+
+ if ( jack_activate(jd->client) ) {
+ g_set_error(error_r, jack_output_quark(), 0,
+ "cannot activate client");
+ mpd_jack_stop(jd);
+ return false;
+ }
+
+ if (jd->output_ports[1] == NULL) {
+ /* no output ports were configured - ask libjack for
+ defaults */
+ jports = jack_get_ports(jd->client, NULL, NULL,
+ JackPortIsPhysical | JackPortIsInput);
+ if (jports == NULL) {
+ g_set_error(error_r, jack_output_quark(), 0,
+ "no ports found");
+ mpd_jack_stop(jd);
+ return false;
+ }
+
+ output_ports[0] = jports[0];
+ output_ports[1] = jports[1] != NULL ? jports[1] : jports[0];
+
+ g_debug("output_ports: %s %s", jports[0], jports[1]);
+ } else {
+ /* use the configured output ports */
+
+ output_ports[0] = jd->output_ports[0];
+ output_ports[1] = jd->output_ports[1];
+
+ jports = NULL;
+ }
+
+ for (unsigned i = 0; i < G_N_ELEMENTS(jd->ports); ++i) {
+ int ret;
+
+ ret = jack_connect(jd->client, jack_port_name(jd->ports[i]),
+ output_ports[i]);
+ if (ret != 0) {
+ g_set_error(error_r, jack_output_quark(), 0,
+ "Not a valid JACK port: %s",
+ output_ports[i]);
+
+ if (jports != NULL)
+ free(jports);
+
+ mpd_jack_stop(jd);
+ return false;
+ }
+ }
+
+ if (jports != NULL)
+ free(jports);
+
+ return true;
+}
+
+static bool
+mpd_jack_open(void *data, struct audio_format *audio_format, GError **error_r)
+{
+ struct jack_data *jd = data;
+
+ assert(jd != NULL);
+
+ jd->pause = false;
+
+ if (!mpd_jack_start(jd, error_r))
+ return false;
+
+ set_audioformat(jd, audio_format);
+ jd->audio_format = *audio_format;
+
+ return true;
+}
+
+static void
+mpd_jack_close(G_GNUC_UNUSED void *data)
+{
+ struct jack_data *jd = data;
+
+ mpd_jack_stop(jd);
+}
+
+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(struct jack_data *jd, const int16_t *src,
+ unsigned num_samples)
+{
+ jack_default_audio_sample_t sample;
+
+ while (num_samples-- > 0) {
+ sample = sample_16_to_jack(*src++);
+ jack_ringbuffer_write(jd->ringbuffer[0], (void*)&sample,
+ sizeof(sample));
+
+ sample = sample_16_to_jack(*src++);
+ jack_ringbuffer_write(jd->ringbuffer[1], (void*)&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(struct jack_data *jd, const int32_t *src,
+ unsigned num_samples)
+{
+ jack_default_audio_sample_t sample;
+
+ while (num_samples-- > 0) {
+ sample = sample_24_to_jack(*src++);
+ jack_ringbuffer_write(jd->ringbuffer[0], (void*)&sample,
+ sizeof(sample));
+
+ sample = sample_24_to_jack(*src++);
+ jack_ringbuffer_write(jd->ringbuffer[1], (void*)&sample,
+ sizeof(sample));
+ }
+}
+
+static void
+mpd_jack_write_samples(struct jack_data *jd, const void *src,
+ unsigned num_samples)
+{
+ switch (jd->audio_format.bits) {
+ case 16:
+ mpd_jack_write_samples_16(jd, (const int16_t*)src,
+ num_samples);
+ break;
+
+ case 24:
+ mpd_jack_write_samples_24(jd, (const int32_t*)src,
+ num_samples);
+ break;
+
+ default:
+ assert(false);
+ }
+}
+
+static size_t
+mpd_jack_play(void *data, const void *chunk, size_t size, GError **error_r)
+{
+ struct jack_data *jd = data;
+ const size_t frame_size = audio_format_frame_size(&jd->audio_format);
+ size_t space = 0, space1;
+
+ jd->pause = false;
+
+ assert(size % frame_size == 0);
+ size /= frame_size;
+
+ while (true) {
+ if (jd->shutdown) {
+ g_set_error(error_r, jack_output_quark(), 0,
+ "Refusing to play, because "
+ "there is no client thread");
+ return 0;
+ }
+
+ space = jack_ringbuffer_write_space(jd->ringbuffer[0]);
+ space1 = jack_ringbuffer_write_space(jd->ringbuffer[1]);
+ if (space > space1)
+ /* send data symmetrically */
+ space = space1;
+
+ if (space >= frame_size)
+ break;
+
+ /* XXX do something more intelligent to
+ synchronize */
+ g_usleep(1000);
+ }
+
+ space /= sample_size;
+ if (space < size)
+ size = space;
+
+ mpd_jack_write_samples(jd, chunk, size);
+ return size * frame_size;
+}
+
+static bool
+mpd_jack_pause(void *data)
+{
+ struct jack_data *jd = data;
+
+ if (jd->shutdown)
+ return false;
+
+ jd->pause = true;
+
+ /* due to a MPD API limitation, we have to sleep a little bit
+ here, to avoid hogging the CPU */
+ g_usleep(50000);
+
+ return true;
+}
+
+const struct audio_output_plugin jack_output_plugin = {
+ .name = "jack",
+ .test_default_device = mpd_jack_test_default_device,
+ .init = mpd_jack_init,
+ .finish = mpd_jack_finish,
+ .enable = mpd_jack_enable,
+ .disable = mpd_jack_disable,
+ .open = mpd_jack_open,
+ .play = mpd_jack_play,
+ .pause = mpd_jack_pause,
+ .close = mpd_jack_close,
+};