#define DEFAULT_BUFSIZE 65536
#define DEFAULT_CLIENT_NAME "gst-aseq-appsrc"
#define DEFAULT_TICK_PERIOD_MS 10
-#define DEFAULT_POLL_TIMEOUT_MS (DEFAULT_TICK_PERIOD_MS / 2)
-GST_DEBUG_CATEGORY (mysrc_debug);
-#define GST_CAT_DEFAULT mysrc_debug
+GST_DEBUG_CATEGORY (mysource_debug);
+#define GST_CAT_DEFAULT mysource_debug
typedef struct _App App;
GMainLoop *loop;
snd_seq_t *seq;
+ int queue;
int port_count;
snd_seq_addr_t *seq_ports;
snd_midi_event_t *parser;
int npfds;
guint64 tick;
+ guint64 delay;
};
-App s_app;
+static App s_app;
static int
init_seq (App * app)
goto error;
}
+ /*
+ * Prevent Valgrind from reporting cached configuration as memory leaks, see:
+ * http://git.alsa-project.org/?p=alsa-lib.git;a=blob;f=MEMORY-LEAK;hb=HEAD
+ */
+ snd_config_update_free_global();
+
ret = snd_seq_set_client_name (app->seq, DEFAULT_CLIENT_NAME);
if (ret < 0) {
GST_ERROR ("Cannot set client name - %s", snd_strerror (ret));
}
static int
+start_queue_timer (snd_seq_t *seq, int queue)
+{
+ int ret;
+
+ ret = snd_seq_start_queue (seq, queue, NULL);
+ if (ret < 0) {
+ GST_ERROR ("Timer event output error: %s\n", snd_strerror (ret));
+ return ret;
+ }
+
+ ret = snd_seq_drain_output (seq);
+ if (ret < 0)
+ GST_ERROR ("Drain output error: %s\n", snd_strerror (ret));
+
+ return ret;
+}
+
+static void
+schedule_tick (App * app)
+{
+ snd_seq_event_t ev;
+ snd_seq_real_time_t time;
+ int ret;
+
+ snd_seq_ev_clear (&ev);
+ snd_seq_ev_set_source (&ev, 0);
+ snd_seq_ev_set_dest (&ev, snd_seq_client_id (app->seq), 0);
+
+ ev.type = SND_SEQ_EVENT_TICK;
+
+ GST_TIME_TO_TIMESPEC (app->tick * DEFAULT_TICK_PERIOD_MS * GST_MSECOND, time);
+ app->tick += 1;
+
+ snd_seq_ev_schedule_real (&ev, app->queue, 0, &time);
+
+ ret = snd_seq_event_output (app->seq, &ev);
+ if (ret < 0)
+ GST_ERROR ("Event output error: %s\n", snd_strerror (ret));
+
+ ret = snd_seq_drain_output (app->seq);
+ if (ret < 0)
+ GST_ERROR ("Event drain error: %s\n", snd_strerror (ret));
+}
+
+static int
create_port (App * app)
{
+ snd_seq_port_info_t *pinfo;
int ret;
- ret = snd_seq_create_simple_port (app->seq, DEFAULT_CLIENT_NAME,
- SND_SEQ_PORT_CAP_WRITE |
- SND_SEQ_PORT_CAP_SUBS_WRITE,
- SND_SEQ_PORT_TYPE_MIDI_GENERIC | SND_SEQ_PORT_TYPE_APPLICATION);
+ snd_seq_port_info_alloca (&pinfo);
+ snd_seq_port_info_set_name (pinfo, DEFAULT_CLIENT_NAME);
+ snd_seq_port_info_set_type (pinfo, SND_SEQ_PORT_TYPE_MIDI_GENERIC | SND_SEQ_PORT_TYPE_APPLICATION);
+ snd_seq_port_info_set_capability (pinfo, SND_SEQ_PORT_CAP_WRITE | SND_SEQ_PORT_CAP_SUBS_WRITE);
+
+ ret = snd_seq_alloc_queue (app->seq);
+ if (ret < 0) {
+ GST_ERROR ("Cannot allocate queue: %s\n", snd_strerror (ret));
+ return ret;
+ }
+
+ app->queue = ret;
+
+ snd_seq_port_info_set_timestamping (pinfo, 1);
+ snd_seq_port_info_set_timestamp_real (pinfo, 1);
+ snd_seq_port_info_set_timestamp_queue (pinfo, app->queue);
+
+ ret = snd_seq_create_port (app->seq, pinfo);
if (ret < 0)
GST_ERROR ("Cannot create port - %s", snd_strerror (ret));
}
static void
-push_buffer (App * app, gpointer data, guint size)
+push_buffer (App * app, gpointer data, guint size, GstClockTime time)
{
+ gpointer local_data;
GstBuffer *buffer;
- GstClockTime time;
int ret;
- gpointer local_data;
- /* read the next chunk */
buffer = gst_buffer_new ();
- time = app->tick * DEFAULT_TICK_PERIOD_MS * GST_MSECOND;
-
GST_BUFFER_DTS (buffer) = time;
GST_BUFFER_PTS (buffer) = time;
- GST_BUFFER_OFFSET (buffer) = time;
- GST_BUFFER_DURATION (buffer) = DEFAULT_TICK_PERIOD_MS * GST_MSECOND;
- local_data = g_malloc (size);
- memcpy (local_data, data, size);
+ local_data = g_memdup (data, size);
gst_buffer_append_memory (buffer,
gst_memory_new_wrapped (0, local_data, size, 0, size, local_data,
g_free));
+ GST_MEMDUMP ("MIDI data:", local_data, size);
+
GST_DEBUG ("feed buffer %p, tick %" G_GUINT64_FORMAT " size: %u",
(gpointer) buffer, app->tick, size);
g_signal_emit_by_name (app->appsrc, "push-buffer", buffer, &ret);
gst_buffer_unref (buffer);
-
- app->tick += 1;
}
static void
-push_tick_buffer (App * app)
+push_tick_buffer (App * app, GstClockTime time)
{
app->buffer[0] = 0xf9;
- push_buffer (app, app->buffer, 1);
+ push_buffer (app, app->buffer, 1, time);
}
/* This method is called by the need-data signal callback, we feed data into the
static void
feed_data (GstElement * appsrc, guint size, App * app)
{
- long size_ev = 0;
+ GstClockTime time;
+ long size_ev;
int err;
int ret;
+poll:
snd_seq_poll_descriptors (app->seq, app->pfds, app->npfds, POLLIN);
- ret = poll (app->pfds, app->npfds, DEFAULT_POLL_TIMEOUT_MS);
- if (ret < 0) {
+ ret = poll (app->pfds, app->npfds, -1);
+ if (ret <= 0) {
GST_ERROR ("ERROR in poll: %s", strerror (errno));
- } else if (ret == 0) {
- push_tick_buffer (app);
+ gst_app_src_end_of_stream (GST_APP_SRC (appsrc));
} else {
do {
snd_seq_event_t *event;
err = snd_seq_event_input (app->seq, &event);
- if (err < 0)
+ if (err < 0 && err != -EAGAIN) {
+ GST_ERROR ("Error in snd_seq_event_input: %s", snd_strerror (err));
+ gst_app_src_end_of_stream (GST_APP_SRC (appsrc));
break;
+ }
if (event) {
+ time = GST_TIMESPEC_TO_TIME (event->time.time) + app->delay;
+
+ /*
+ * Special handling is needed because decoding SND_SEQ_EVENT_TICK is
+ * not supported by the ALSA sequencer.
+ */
+ if (event->type == SND_SEQ_EVENT_TICK) {
+ push_tick_buffer (app, time);
+ schedule_tick (app);
+ break;
+ }
+
size_ev =
snd_midi_event_decode (app->parser, app->buffer, DEFAULT_BUFSIZE,
event);
/* ENOENT indicates an event that is not a MIDI message, silently skip it */
if (-ENOENT == size_ev) {
GST_WARNING ("Warning: Received non-MIDI message");
- push_tick_buffer (app);
+ goto poll;
} else {
GST_ERROR ("Error decoding event from ALSA to output: %s",
strerror (-size_ev));
+ gst_app_src_end_of_stream (GST_APP_SRC (appsrc));
break;
}
} else {
- push_buffer (app, app->buffer, size_ev);
+ push_buffer (app, app->buffer, size_ev, time);
}
}
} while (err > 0);
g_main_loop_quit (app->loop);
break;
}
+ case GST_MESSAGE_STATE_CHANGED:
+ {
+ GstState old_state, new_state;
+
+ gst_message_parse_state_changed (message, &old_state, &new_state, NULL);
+ if (new_state == GST_STATE_PLAYING) {
+ GstClockTime gst_time;
+ GstClockTime base_time;
+ GstClockTime running_time;
+ GstClockTime queue_time;
+ GstClock *clock;
+ snd_seq_queue_status_t *status;
+
+ if (app->tick == 0) {
+ start_queue_timer (app->seq, app->queue);
+ schedule_tick (app);
+ }
+
+ clock = gst_element_get_clock (GST_ELEMENT (app->appsrc));
+ gst_time = gst_clock_get_time (clock);
+ gst_object_unref (clock);
+ base_time = gst_element_get_base_time (GST_ELEMENT (app->appsrc));
+ running_time = gst_time - base_time;
+
+ snd_seq_queue_status_malloc (&status);
+ snd_seq_get_queue_status (app->seq, 0, status);
+ queue_time = GST_TIMESPEC_TO_TIME (*snd_seq_queue_status_get_real_time (status));
+ snd_seq_queue_status_free (status);
+
+ app->delay = running_time - queue_time;
+ }
+ break;
+ }
case GST_MESSAGE_EOS:
g_main_loop_quit (app->loop);
break;
GOptionContext *ctx;
GError *err = NULL;
gchar *ports = NULL;
+ gboolean verbose = FALSE;
GOptionEntry options[] = {
{"ports", 'p', 0, G_OPTION_ARG_STRING, &ports,
"Comma separated list of sequencer ports", "client:port,..."},
+ {"verbose", 'v', 0, G_OPTION_ARG_NONE, &verbose,
+ "Output status information and property notifications", NULL},
{NULL}
};
gst_init (&argc, &argv);
- GST_DEBUG_CATEGORY_INIT (mysrc_debug, "mysrc", 0,
+ GST_DEBUG_CATEGORY_INIT (mysource_debug, "mysource", 0,
"ALSA MIDI sequencer appsrc pipeline");
ret = app_init (app, ports);
("appsrc name=mysource ! fluiddec ! audioconvert ! autoaudiosink", NULL);
g_assert (app->pipeline);
+ if (verbose)
+ g_signal_connect (app->pipeline, "deep-notify", G_CALLBACK (gst_object_default_deep_notify), NULL);
+
bus = gst_pipeline_get_bus (GST_PIPELINE (app->pipeline));
g_assert (bus);
projects / gst-aseq-appsrc.git / blobdiff