Merge remote-tracking branch 'keema/master'

This commit is contained in:
Sebastian Dröge 2012-07-04 10:31:47 +02:00
commit e77c4d94c8
23 changed files with 1428 additions and 2 deletions

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@ -0,0 +1,141 @@
#include <string.h>
#include <gst/gst.h>
typedef struct _CustomData {
GstElement *pipeline;
GstElement *video_sink;
GMainLoop *loop;
gboolean playing; /* Playing or Paused */
gdouble rate; /* Current playback rate (can be negative) */
} CustomData;
/* Send seek event to change rate */
static void send_seek_event (CustomData *data) {
gint64 position;
GstFormat format = GST_FORMAT_TIME;
GstEvent *seek_event;
/* Obtain the current position, needed for the seek event */
if (!gst_element_query_position (data->pipeline, &format, &position)) {
g_printerr ("Unable to retrieve current position.\n");
return;
}
/* Create the seek event */
if (data->rate > 0) {
seek_event = gst_event_new_seek (data->rate, GST_FORMAT_TIME, GST_SEEK_FLAG_FLUSH | GST_SEEK_FLAG_ACCURATE,
GST_SEEK_TYPE_SET, position, GST_SEEK_TYPE_NONE, 0);
} else {
seek_event = gst_event_new_seek (data->rate, GST_FORMAT_TIME, GST_SEEK_FLAG_FLUSH | GST_SEEK_FLAG_ACCURATE,
GST_SEEK_TYPE_NONE, 0, GST_SEEK_TYPE_SET, position);
}
if (data->video_sink == NULL) {
/* If we have not done so, obtain the sink through which we will send the seek events */
g_object_get (data->pipeline, "video_sink", &data->video_sink, NULL);
}
/* Send the event */
gst_element_send_event (data->video_sink, seek_event);
g_print ("Current rate: %g\n", data->rate);
}
/* Process keyboard input */
static gboolean handle_keyboard (GIOChannel *source, GIOCondition cond, CustomData *data) {
gchar *str = NULL;
if (g_io_channel_read_line (source, &str, NULL, NULL, NULL) != G_IO_STATUS_NORMAL) {
return TRUE;
}
switch (g_ascii_tolower (str[0])) {
case 'p':
data->playing = !data->playing;
gst_element_set_state (data->pipeline, data->playing ? GST_STATE_PLAYING : GST_STATE_PAUSED);
g_print ("Setting state to %s\n", data->playing ? "PLAYING" : "PAUSE");
break;
case 's':
if (g_ascii_isupper (str[0])) {
data->rate *= 2.0;
} else {
data->rate /= 2.0;
}
send_seek_event (data);
break;
case 'd':
data->rate *= -1.0;
send_seek_event (data);
break;
case 'n':
gst_element_send_event (data->pipeline,
gst_event_new_step (GST_FORMAT_BUFFERS, 1, data->rate, TRUE, FALSE));
g_print ("Stepping one frame\n");
break;
case 'q':
g_main_loop_quit (data->loop);
break;
default:
break;
}
g_free (str);
return TRUE;
}
int main(int argc, char *argv[]) {
CustomData data;
GstStateChangeReturn ret;
GIOChannel *io_stdin;
/* Initialize GStreamer */
gst_init (&argc, &argv);
/* Initialize our data structure */
memset (&data, 0, sizeof (data));
/* Print usage map */
g_print (
"USAGE: Choose one of the following options, then press enter:\n"
" 'P' to toggle between PAUSE and PLAY\n"
" 'S' to increase playback speed, 's' to decrease playback speed\n"
" 'D' to toggle playback direction\n"
" 'N' to move to next frame (in the current direction, better in PAUSE)\n"
" 'Q' to quit\n");
/* Build the pipeline */
data.pipeline = gst_parse_launch ("playbin2 uri=http://docs.gstreamer.com/media/sintel_trailer-480p.webm", NULL);
/* Add a keyboard watch so we get notified of keystrokes */
#ifdef _WIN32
io_stdin = g_io_channel_win32_new_fd (fileno (stdin));
#else
io_stdin = g_io_channel_unix_new (fileno (stdin));
#endif
g_io_add_watch (io_stdin, G_IO_IN, (GIOFunc)handle_keyboard, &data);
/* Start playing */
ret = gst_element_set_state (data.pipeline, GST_STATE_PLAYING);
if (ret == GST_STATE_CHANGE_FAILURE) {
g_printerr ("Unable to set the pipeline to the playing state.\n");
gst_object_unref (data.pipeline);
return -1;
}
data.playing = TRUE;
data.rate = 1.0;
/* Create a GLib Main Loop and set it to run */
data.loop = g_main_loop_new (NULL, FALSE);
g_main_loop_run (data.loop);
/* Free resources */
g_main_loop_unref (data.loop);
g_io_channel_unref (io_stdin);
gst_element_set_state (data.pipeline, GST_STATE_NULL);
if (data.video_sink != NULL)
gst_object_unref (data.video_sink);
gst_object_unref (data.pipeline);
return 0;
}

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@ -21,7 +21,7 @@ typedef struct _CustomData {
/* This method is called by the idle GSource in the mainloop, to feed CHUNK_SIZE bytes into appsrc. /* This method is called by the idle GSource in the mainloop, to feed CHUNK_SIZE bytes into appsrc.
* The ide handler is added to the mainloop when appsrc requests us to start sending data (need-data signal) * The ide handler is added to the mainloop when appsrc requests us to start sending data (need-data signal)
* and is removed when appsrc has enough data (enough-data signal). * and is removed when appsrc has enough data (enough-data signal).
*/ */
static gboolean push_data (CustomData *data) { static gboolean push_data (CustomData *data) {
GstBuffer *buffer; GstBuffer *buffer;

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@ -193,6 +193,8 @@ static gboolean handle_message (GstBus *bus, GstMessage *msg, CustomData *data)
} }
} }
} break; } break;
default:
break;
} }
/* We want to keep receiving messages */ /* We want to keep receiving messages */

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@ -195,6 +195,8 @@ static gboolean handle_message (GstBus *bus, GstMessage *msg, CustomData *data)
} }
} }
} break; } break;
default:
break;
} }
/* We want to keep receiving messages */ /* We want to keep receiving messages */

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@ -0,0 +1,152 @@
#include <gst/gst.h>
#include <string.h>
#define CHUNK_SIZE 1024 /* Amount of bytes we are sending in each buffer */
#define SAMPLE_RATE 44100 /* Samples per second we are sending */
#define AUDIO_CAPS "audio/x-raw-int,channels=1,rate=%d,signed=(boolean)true,width=16,depth=16,endianness=BYTE_ORDER"
/* Structure to contain all our information, so we can pass it to callbacks */
typedef struct _CustomData {
GstElement *pipeline;
GstElement *app_source;
guint64 num_samples; /* Number of samples generated so far (for timestamp generation) */
gfloat a, b, c, d; /* For waveform generation */
guint sourceid; /* To control the GSource */
GMainLoop *main_loop; /* GLib's Main Loop */
} CustomData;
/* This method is called by the idle GSource in the mainloop, to feed CHUNK_SIZE bytes into appsrc.
* The ide handler is added to the mainloop when appsrc requests us to start sending data (need-data signal)
* and is removed when appsrc has enough data (enough-data signal).
*/
static gboolean push_data (CustomData *data) {
GstBuffer *buffer;
GstFlowReturn ret;
int i;
gint16 *raw;
gint num_samples = CHUNK_SIZE / 2; /* Because each sample is 16 bits */
gfloat freq;
/* Create a new empty buffer */
buffer = gst_buffer_new_and_alloc (CHUNK_SIZE);
/* Set its timestamp and duration */
GST_BUFFER_TIMESTAMP (buffer) = gst_util_uint64_scale (data->num_samples, GST_SECOND, SAMPLE_RATE);
GST_BUFFER_DURATION (buffer) = gst_util_uint64_scale (CHUNK_SIZE, GST_SECOND, SAMPLE_RATE);
/* Generate some psychodelic waveforms */
raw = (gint16 *)GST_BUFFER_DATA (buffer);
data->c += data->d;
data->d -= data->c / 1000;
freq = 1100 + 1000 * data->d;
for (i = 0; i < num_samples; i++) {
data->a += data->b;
data->b -= data->a / freq;
raw[i] = (gint16)(500 * data->a);
}
data->num_samples += num_samples;
/* Push the buffer into the appsrc */
g_signal_emit_by_name (data->app_source, "push-buffer", buffer, &ret);
/* Free the buffer now that we are done with it */
gst_buffer_unref (buffer);
if (ret != GST_FLOW_OK) {
/* We got some error, stop sending data */
return FALSE;
}
return TRUE;
}
/* This signal callback triggers when appsrc needs data. Here, we add an idle handler
* to the mainloop to start pushing data into the appsrc */
static void start_feed (GstElement *source, guint size, CustomData *data) {
if (data->sourceid == 0) {
g_print ("Start feeding\n");
data->sourceid = g_idle_add ((GSourceFunc) push_data, data);
}
}
/* This callback triggers when appsrc has enough data and we can stop sending.
* We remove the idle handler from the mainloop */
static void stop_feed (GstElement *source, CustomData *data) {
if (data->sourceid != 0) {
g_print ("Stop feeding\n");
g_source_remove (data->sourceid);
data->sourceid = 0;
}
}
/* This function is called when an error message is posted on the bus */
static void error_cb (GstBus *bus, GstMessage *msg, CustomData *data) {
GError *err;
gchar *debug_info;
/* Print error details on the screen */
gst_message_parse_error (msg, &err, &debug_info);
g_printerr ("Error received from element %s: %s\n", GST_OBJECT_NAME (msg->src), err->message);
g_printerr ("Debugging information: %s\n", debug_info ? debug_info : "none");
g_clear_error (&err);
g_free (debug_info);
g_main_loop_quit (data->main_loop);
}
/* This function is called when playbin2 has created the appsrc element, so we have
* a chance to configure it. */
static void source_setup (GstElement *pipeline, GstElement *source, CustomData *data) {
gchar *audio_caps_text;
GstCaps *audio_caps;
g_print ("Source has been created. Configuring.\n");
data->app_source = source;
/* Configure appsrc */
audio_caps_text = g_strdup_printf (AUDIO_CAPS, SAMPLE_RATE);
audio_caps = gst_caps_from_string (audio_caps_text);
g_object_set (source, "caps", audio_caps, NULL);
g_signal_connect (source, "need-data", G_CALLBACK (start_feed), data);
g_signal_connect (source, "enough-data", G_CALLBACK (stop_feed), data);
gst_caps_unref (audio_caps);
g_free (audio_caps_text);
}
int main(int argc, char *argv[]) {
CustomData data;
GstBus *bus;
/* Initialize cumstom data structure */
memset (&data, 0, sizeof (data));
data.b = 1; /* For waveform generation */
data.d = 1;
/* Initialize GStreamer */
gst_init (&argc, &argv);
/* Create the playbin2 element */
data.pipeline = gst_parse_launch ("playbin2 uri=appsrc://", NULL);
g_signal_connect (data.pipeline, "source-setup", G_CALLBACK (source_setup), &data);
/* Instruct the bus to emit signals for each received message, and connect to the interesting signals */
bus = gst_element_get_bus (data.pipeline);
gst_bus_add_signal_watch (bus);
g_signal_connect (G_OBJECT (bus), "message::error", (GCallback)error_cb, &data);
gst_object_unref (bus);
/* Start playing the pipeline */
gst_element_set_state (data.pipeline, GST_STATE_PLAYING);
/* Create a GLib Main Loop and set it to run */
data.main_loop = g_main_loop_new (NULL, FALSE);
g_main_loop_run (data.main_loop);
/* Free resources */
gst_element_set_state (data.pipeline, GST_STATE_NULL);
gst_object_unref (data.pipeline);
return 0;
}

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@ -0,0 +1,172 @@
#include <gst/gst.h>
#include <string.h>
#define GRAPH_LENGTH 80
/* playbin2 flags */
typedef enum {
GST_PLAY_FLAG_DOWNLOAD = (1 << 7) /* Enable progressive download (on selected formats) */
} GstPlayFlags;
typedef struct _CustomData {
gboolean is_live;
GstElement *pipeline;
GMainLoop *loop;
gint buffering_level;
} CustomData;
static void got_location (GstObject *gstobject, GstObject *prop_object, GParamSpec *prop, gpointer data) {
gchar *location;
g_object_get (G_OBJECT (prop_object), "temp-location", &location, NULL);
g_print ("Temporary file: %s\n", location);
/* Uncomment this line to keep the temporary file after the program exits */
/* g_object_set (G_OBJECT (prop_object), "temp-remove", FALSE, NULL); */
}
static void cb_message (GstBus *bus, GstMessage *msg, CustomData *data) {
switch (GST_MESSAGE_TYPE (msg)) {
case GST_MESSAGE_ERROR: {
GError *err;
gchar *debug;
gst_message_parse_error (msg, &err, &debug);
g_print ("Error: %s\n", err->message);
g_error_free (err);
g_free (debug);
gst_element_set_state (data->pipeline, GST_STATE_READY);
g_main_loop_quit (data->loop);
break;
}
case GST_MESSAGE_EOS:
/* end-of-stream */
gst_element_set_state (data->pipeline, GST_STATE_READY);
g_main_loop_quit (data->loop);
break;
case GST_MESSAGE_BUFFERING:
/* If the stream is live, we do not care about buffering. */
if (data->is_live) break;
gst_message_parse_buffering (msg, &data->buffering_level);
/* Wait until buffering is complete before start/resume playing */
if (data->buffering_level < 100)
gst_element_set_state (data->pipeline, GST_STATE_PAUSED);
else
gst_element_set_state (data->pipeline, GST_STATE_PLAYING);
break;
case GST_MESSAGE_CLOCK_LOST:
/* Get a new clock */
gst_element_set_state (data->pipeline, GST_STATE_PAUSED);
gst_element_set_state (data->pipeline, GST_STATE_PLAYING);
break;
default:
/* Unhandled message */
break;
}
}
static gboolean refresh_ui (CustomData *data) {
GstQuery *query;
gboolean result;
query = gst_query_new_buffering (GST_FORMAT_PERCENT);
result = gst_element_query (data->pipeline, query);
if (result) {
gint n_ranges, range, i;
gchar graph[GRAPH_LENGTH + 1];
GstFormat format = GST_FORMAT_TIME;
gint64 position = 0, duration = 0;
memset (graph, ' ', GRAPH_LENGTH);
graph[GRAPH_LENGTH] = '\0';
n_ranges = gst_query_get_n_buffering_ranges (query);
for (range = 0; range < n_ranges; range++) {
gint64 start, stop;
gst_query_parse_nth_buffering_range (query, range, &start, &stop);
start = start * GRAPH_LENGTH / 100;
stop = stop * GRAPH_LENGTH / 100;
for (i = (gint)start; i < stop; i++)
graph [i] = '-';
}
if (gst_element_query_position (data->pipeline, &format, &position) &&
GST_CLOCK_TIME_IS_VALID (position) &&
gst_element_query_duration (data->pipeline, &format, &duration) &&
GST_CLOCK_TIME_IS_VALID (duration)) {
i = (gint)(GRAPH_LENGTH * (double)position / (double)(duration + 1));
graph [i] = data->buffering_level < 100 ? 'X' : '>';
}
g_print ("[%s]", graph);
if (data->buffering_level < 100) {
g_print (" Buffering: %3d%%", data->buffering_level);
} else {
g_print (" ");
}
g_print ("\r");
}
return TRUE;
}
int main(int argc, char *argv[]) {
GstElement *pipeline;
GstBus *bus;
GstStateChangeReturn ret;
GMainLoop *main_loop;
CustomData data;
guint flags;
/* Initialize GStreamer */
gst_init (&argc, &argv);
/* Initialize our data structure */
memset (&data, 0, sizeof (data));
data.buffering_level = 100;
/* Build the pipeline */
pipeline = gst_parse_launch ("playbin2 uri=http://docs.gstreamer.com/media/sintel_trailer-480p.webm", NULL);
bus = gst_element_get_bus (pipeline);
/* Set the download flag */
g_object_get (pipeline, "flags", &flags, NULL);
flags |= GST_PLAY_FLAG_DOWNLOAD;
g_object_set (pipeline, "flags", flags, NULL);
/* Uncomment this line to limit the amount of downloaded data */
/* g_object_set (pipeline, "ring-buffer-max-size", (guint64)4000000, NULL); */
/* Start playing */
ret = gst_element_set_state (pipeline, GST_STATE_PLAYING);
if (ret == GST_STATE_CHANGE_FAILURE) {
g_printerr ("Unable to set the pipeline to the playing state.\n");
gst_object_unref (pipeline);
return -1;
} else if (ret == GST_STATE_CHANGE_NO_PREROLL) {
data.is_live = TRUE;
}
main_loop = g_main_loop_new (NULL, FALSE);
data.loop = main_loop;
data.pipeline = pipeline;
gst_bus_add_signal_watch (bus);
g_signal_connect (bus, "message", G_CALLBACK (cb_message), &data);
g_signal_connect (pipeline, "deep-notify::temp-location", G_CALLBACK (got_location), NULL);
/* Register a function that GLib will call every second */
g_timeout_add_seconds (1, (GSourceFunc)refresh_ui, &data);
g_main_loop_run (main_loop);
/* Free resources */
g_main_loop_unref (main_loop);
gst_object_unref (bus);
gst_element_set_state (pipeline, GST_STATE_NULL);
gst_object_unref (pipeline);
g_print ("\n");
return 0;
}

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@ -0,0 +1,145 @@
#include <string.h>
#include <gst/gst.h>
#include <gst/interfaces/colorbalance.h>
typedef struct _CustomData {
GstElement *pipeline;
GMainLoop *loop;
} CustomData;
/* Process a color balance command */
static void update_color_channel (const gchar *channel_name, gboolean increase, GstColorBalance *cb) {
gdouble step;
gint value;
GstColorBalanceChannel *channel = NULL;
const GList *channels, *l;
/* Retrieve the list of channels and locate the requested one */
channels = gst_color_balance_list_channels (cb);
for (l = channels; l != NULL; l = l->next) {
GstColorBalanceChannel *tmp = (GstColorBalanceChannel *)l->data;
if (g_strrstr (tmp->label, channel_name)) {
channel = tmp;
break;
}
}
if (!channel)
return;
/* Change the channel's value */
step = 0.1 * (channel->max_value - channel->min_value);
value = gst_color_balance_get_value (cb, channel);
if (increase) {
value = (gint)(value + step);
if (value > channel->max_value)
value = channel->max_value;
} else {
value = (gint)(value - step);
if (value < channel->min_value)
value = channel->min_value;
}
gst_color_balance_set_value (cb, channel, value);
}
/* Output the current values of all Color Balance channels */
static void print_current_values (GstElement *pipeline) {
const GList *channels, *l;
/* Output Color Balance values */
channels = gst_color_balance_list_channels (GST_COLOR_BALANCE (pipeline));
for (l = channels; l != NULL; l = l->next) {
GstColorBalanceChannel *channel = (GstColorBalanceChannel *)l->data;
gint value = gst_color_balance_get_value (GST_COLOR_BALANCE (pipeline), channel);
g_print ("%s: %3d%% ", channel->label,
100 * (value - channel->min_value) / (channel->max_value - channel->min_value));
}
g_print ("\n");
}
/* Process keyboard input */
static gboolean handle_keyboard (GIOChannel *source, GIOCondition cond, CustomData *data) {
gchar *str = NULL;
if (g_io_channel_read_line (source, &str, NULL, NULL, NULL) != G_IO_STATUS_NORMAL) {
return TRUE;
}
switch (g_ascii_tolower (str[0])) {
case 'c':
update_color_channel ("CONTRAST", g_ascii_isupper (str[0]), GST_COLOR_BALANCE (data->pipeline));
break;
case 'b':
update_color_channel ("BRIGHTNESS", g_ascii_isupper (str[0]), GST_COLOR_BALANCE (data->pipeline));
break;
case 'h':
update_color_channel ("HUE", g_ascii_isupper (str[0]), GST_COLOR_BALANCE (data->pipeline));
break;
case 's':
update_color_channel ("SATURATION", g_ascii_isupper (str[0]), GST_COLOR_BALANCE (data->pipeline));
break;
case 'q':
g_main_loop_quit (data->loop);
break;
default:
break;
}
g_free (str);
print_current_values (data->pipeline);
return TRUE;
}
int main(int argc, char *argv[]) {
CustomData data;
GstStateChangeReturn ret;
GIOChannel *io_stdin;
/* Initialize GStreamer */
gst_init (&argc, &argv);
/* Initialize our data structure */
memset (&data, 0, sizeof (data));
/* Print usage map */
g_print (
"USAGE: Choose one of the following options, then press enter:\n"
" 'C' to increase contrast, 'c' to decrease contrast\n"
" 'B' to increase brightness, 'b' to decrease brightness\n"
" 'H' to increase hue, 'h' to decrease hue\n"
" 'S' to increase saturation, 's' to decrease saturation\n"
" 'Q' to quit\n");
/* Build the pipeline */
data.pipeline = gst_parse_launch ("playbin2 uri=http://docs.gstreamer.com/media/sintel_trailer-480p.webm", NULL);
/* Add a keyboard watch so we get notified of keystrokes */
#ifdef _WIN32
io_stdin = g_io_channel_win32_new_fd (fileno (stdin));
#else
io_stdin = g_io_channel_unix_new (fileno (stdin));
#endif
g_io_add_watch (io_stdin, G_IO_IN, (GIOFunc)handle_keyboard, &data);
/* Start playing */
ret = gst_element_set_state (data.pipeline, GST_STATE_PLAYING);
if (ret == GST_STATE_CHANGE_FAILURE) {
g_printerr ("Unable to set the pipeline to the playing state.\n");
gst_object_unref (data.pipeline);
return -1;
}
print_current_values (data.pipeline);
/* Create a GLib Main Loop and set it to run */
data.loop = g_main_loop_new (NULL, FALSE);
g_main_loop_run (data.loop);
/* Free resources */
g_main_loop_unref (data.loop);
g_io_channel_unref (io_stdin);
gst_element_set_state (data.pipeline, GST_STATE_NULL);
gst_object_unref (data.pipeline);
return 0;
}

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@ -0,0 +1,89 @@
#include <gst/gst.h>
/* playbin2 flags */
typedef enum {
GST_PLAY_FLAG_VIS = (1 << 3) /* Enable rendering of visualizations when there is no video stream. */
} GstPlayFlags;
/* Return TRUE if this is a Visualization element */
static gboolean filter_vis_features (GstPluginFeature *feature, gpointer data) {
GstElementFactory *factory;
if (!GST_IS_ELEMENT_FACTORY (feature))
return FALSE;
factory = GST_ELEMENT_FACTORY (feature);
if (!g_strrstr (gst_element_factory_get_klass (factory), "Visualization"))
return FALSE;
return TRUE;
}
int main(int argc, char *argv[]) {
GstElement *pipeline, *vis_plugin;
GstBus *bus;
GstMessage *msg;
GList *list, *walk;
GstElementFactory *selected_factory = NULL;
guint flags;
/* Initialize GStreamer */
gst_init (&argc, &argv);
/* Get a list of all visualization plugins */
list = gst_registry_feature_filter (gst_registry_get_default (), filter_vis_features, FALSE, NULL);
/* Print their names */
g_print("Available visualization plugins:\n");
for (walk = list; walk != NULL; walk = g_list_next (walk)) {
const gchar *name;
GstElementFactory *factory;
factory = GST_ELEMENT_FACTORY (walk->data);
name = gst_element_factory_get_longname (factory);
g_print(" %s\n", name);
if (selected_factory == NULL || g_str_has_prefix (name, "GOOM")) {
selected_factory = factory;
}
}
/* Don't use the factory if it's still empty */
/* e.g. no visualization plugins found */
if (!selected_factory) {
g_print ("No visualization plugins found!\n");
return -1;
}
/* We have now selected a factory for the visualization element */
g_print ("Selected '%s'\n", gst_element_factory_get_longname (selected_factory));
vis_plugin = gst_element_factory_create (selected_factory, NULL);
if (!vis_plugin)
return -1;
/* Build the pipeline */
pipeline = gst_parse_launch ("playbin2 uri=http://radio.hbr1.com:19800/ambient.ogg", NULL);
/* Set the visualization flag */
g_object_get (pipeline, "flags", &flags, NULL);
flags |= GST_PLAY_FLAG_VIS;
g_object_set (pipeline, "flags", flags, NULL);
/* set vis plugin for playbin2 */
g_object_set (pipeline, "vis-plugin", vis_plugin, NULL);
/* Start playing */
gst_element_set_state (pipeline, GST_STATE_PLAYING);
/* Wait until error or EOS */
bus = gst_element_get_bus (pipeline);
msg = gst_bus_timed_pop_filtered (bus, GST_CLOCK_TIME_NONE, GST_MESSAGE_ERROR | GST_MESSAGE_EOS);
/* Free resources */
if (msg != NULL)
gst_message_unref (msg);
gst_plugin_feature_list_free (list);
gst_object_unref (bus);
gst_element_set_state (pipeline, GST_STATE_NULL);
gst_object_unref (pipeline);
return 0;
}

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#include <gst/gst.h>
int main(int argc, char *argv[]) {
GstElement *pipeline, *bin, *equalizer, *convert, *sink;
GstPad *pad, *ghost_pad;
GstBus *bus;
GstMessage *msg;
/* Initialize GStreamer */
gst_init (&argc, &argv);
/* Build the pipeline */
pipeline = gst_parse_launch ("playbin2 uri=http://docs.gstreamer.com/media/sintel_trailer-480p.webm", NULL);
/* Create the elements inside the sink bin */
equalizer = gst_element_factory_make ("equalizer-3bands", "equalizer");
convert = gst_element_factory_make ("audioconvert", "convert");
sink = gst_element_factory_make ("autoaudiosink", "audio_sink");
if (!equalizer || !convert || !sink) {
g_printerr ("Not all elements could be created.\n");
return -1;
}
/* Create the sink bin, add the elements and link them */
bin = gst_bin_new ("audio_sink_bin");
gst_bin_add_many (GST_BIN (bin), equalizer, convert, sink, NULL);
gst_element_link_many (equalizer, convert, sink, NULL);
pad = gst_element_get_static_pad (equalizer, "sink");
ghost_pad = gst_ghost_pad_new ("sink", pad);
gst_pad_set_active (ghost_pad, TRUE);
gst_element_add_pad (bin, ghost_pad);
gst_object_unref (pad);
/* Configure the equalizer */
g_object_set (G_OBJECT (equalizer), "band1", (gdouble)-24.0, NULL);
g_object_set (G_OBJECT (equalizer), "band2", (gdouble)-24.0, NULL);
/* Set playbin2's audio sink to be our sink bin */
g_object_set (GST_OBJECT (pipeline), "audio-sink", bin, NULL);
/* Start playing */
gst_element_set_state (pipeline, GST_STATE_PLAYING);
/* Wait until error or EOS */
bus = gst_element_get_bus (pipeline);
msg = gst_bus_timed_pop_filtered (bus, GST_CLOCK_TIME_NONE, GST_MESSAGE_ERROR | GST_MESSAGE_EOS);
/* Free resources */
if (msg != NULL)
gst_message_unref (msg);
gst_object_unref (bus);
gst_element_set_state (pipeline, GST_STATE_NULL);
gst_object_unref (pipeline);
return 0;
}

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