some sample with gstreamer
This commit is contained in:
Chenglin.Ye
@@ -0,0 +1,9 @@
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SRC = $(wildcard *.c)
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TARGET = $(patsubst %.c, %, $(SRC))
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all: $(TARGET)
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%:%.c
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gcc -o $@ $< `pkg-config --libs --cflags gstreamer-1.0`
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clean:
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rm -f $(TARGET)
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@@ -0,0 +1,172 @@
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#include <gst/gst.h>
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#include <string.h>
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#define GRAPH_LENGTH 78
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/* playbin flags */
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typedef enum {
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GST_PLAY_FLAG_DOWNLOAD = (1 << 7) /* Enable progressive download (on selected formats) */
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} GstPlayFlags;
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typedef struct _CustomData {
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gboolean is_live;
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GstElement *pipeline;
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GMainLoop *loop;
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gint buffering_level;
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} CustomData;
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static void got_location (GstObject *gstobject, GstObject *prop_object, GParamSpec *prop, gpointer data) {
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gchar *location;
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g_object_get (G_OBJECT (prop_object), "temp-location", &location, NULL);
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g_print ("Temporary file: %s\n", location);
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g_free (location);
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/* Uncomment this line to keep the temporary file after the program exits */
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/* g_object_set (G_OBJECT (prop_object), "temp-remove", FALSE, NULL); */
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}
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static void cb_message (GstBus *bus, GstMessage *msg, CustomData *data) {
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switch (GST_MESSAGE_TYPE (msg)) {
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case GST_MESSAGE_ERROR: {
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GError *err;
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gchar *debug;
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gst_message_parse_error (msg, &err, &debug);
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g_print ("Error: %s\n", err->message);
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g_error_free (err);
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g_free (debug);
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gst_element_set_state (data->pipeline, GST_STATE_READY);
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g_main_loop_quit (data->loop);
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break;
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}
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case GST_MESSAGE_EOS:
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/* end-of-stream */
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gst_element_set_state (data->pipeline, GST_STATE_READY);
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g_main_loop_quit (data->loop);
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break;
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case GST_MESSAGE_BUFFERING:
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/* If the stream is live, we do not care about buffering. */
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if (data->is_live) break;
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gst_message_parse_buffering (msg, &data->buffering_level);
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/* Wait until buffering is complete before start/resume playing */
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if (data->buffering_level < 100)
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gst_element_set_state (data->pipeline, GST_STATE_PAUSED);
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else
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gst_element_set_state (data->pipeline, GST_STATE_PLAYING);
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break;
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case GST_MESSAGE_CLOCK_LOST:
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/* Get a new clock */
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gst_element_set_state (data->pipeline, GST_STATE_PAUSED);
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gst_element_set_state (data->pipeline, GST_STATE_PLAYING);
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break;
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default:
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/* Unhandled message */
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break;
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}
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}
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static gboolean refresh_ui (CustomData *data) {
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GstQuery *query;
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gboolean result;
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query = gst_query_new_buffering (GST_FORMAT_PERCENT);
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result = gst_element_query (data->pipeline, query);
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if (result) {
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gint n_ranges, range, i;
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gchar graph[GRAPH_LENGTH + 1];
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gint64 position = 0, duration = 0;
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memset (graph, ' ', GRAPH_LENGTH);
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graph[GRAPH_LENGTH] = '\0';
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n_ranges = gst_query_get_n_buffering_ranges (query);
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for (range = 0; range < n_ranges; range++) {
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gint64 start, stop;
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gst_query_parse_nth_buffering_range (query, range, &start, &stop);
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start = start * GRAPH_LENGTH / (stop - start);
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stop = stop * GRAPH_LENGTH / (stop - start);
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for (i = (gint)start; i < stop; i++)
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graph [i] = '-';
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}
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if (gst_element_query_position (data->pipeline, GST_FORMAT_TIME, &position) &&
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GST_CLOCK_TIME_IS_VALID (position) &&
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gst_element_query_duration (data->pipeline, GST_FORMAT_TIME, &duration) &&
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GST_CLOCK_TIME_IS_VALID (duration)) {
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i = (gint)(GRAPH_LENGTH * (double)position / (double)(duration + 1));
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graph [i] = data->buffering_level < 100 ? 'X' : '>';
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}
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g_print ("[%s]", graph);
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if (data->buffering_level < 100) {
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g_print (" Buffering: %3d%%", data->buffering_level);
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} else {
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g_print (" ");
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}
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g_print ("\r");
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}
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return TRUE;
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}
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int main(int argc, char *argv[]) {
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GstElement *pipeline;
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GstBus *bus;
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GstStateChangeReturn ret;
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GMainLoop *main_loop;
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CustomData data;
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guint flags;
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/* Initialize GStreamer */
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gst_init (&argc, &argv);
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/* Initialize our data structure */
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memset (&data, 0, sizeof (data));
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data.buffering_level = 100;
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/* Build the pipeline */
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pipeline = gst_parse_launch ("playbin uri=file:///home/ye/Music/1.wav", NULL);
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bus = gst_element_get_bus (pipeline);
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/* Set the download flag */
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g_object_get (pipeline, "flags", &flags, NULL);
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flags |= GST_PLAY_FLAG_DOWNLOAD;
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g_object_set (pipeline, "flags", flags, NULL);
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/* Uncomment this line to limit the amount of downloaded data */
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/* g_object_set (pipeline, "ring-buffer-max-size", (guint64)4000000, NULL); */
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/* Start playing */
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ret = gst_element_set_state (pipeline, GST_STATE_PLAYING);
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if (ret == GST_STATE_CHANGE_FAILURE) {
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g_printerr ("Unable to set the pipeline to the playing state.\n");
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gst_object_unref (pipeline);
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return -1;
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} else if (ret == GST_STATE_CHANGE_NO_PREROLL) {
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data.is_live = TRUE;
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}
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main_loop = g_main_loop_new (NULL, FALSE);
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data.loop = main_loop;
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data.pipeline = pipeline;
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gst_bus_add_signal_watch (bus);
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g_signal_connect (bus, "message", G_CALLBACK (cb_message), &data);
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g_signal_connect (pipeline, "deep-notify::temp-location", G_CALLBACK (got_location), NULL);
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/* Register a function that GLib will call every second */
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g_timeout_add_seconds (1, (GSourceFunc)refresh_ui, &data);
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g_main_loop_run (main_loop);
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/* Free resources */
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g_main_loop_unref (main_loop);
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gst_object_unref (bus);
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gst_element_set_state (pipeline, GST_STATE_NULL);
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gst_object_unref (pipeline);
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g_print ("\n");
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return 0;
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}
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@@ -0,0 +1,9 @@
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SRC = $(wildcard *.c)
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TARGET = $(patsubst %.c, %, $(SRC))
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all: $(TARGET)
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%:%.c
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gcc -o $@ $< `pkg-config --libs --cflags gstreamer-1.0`
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clean:
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rm -f $(TARGET)
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@@ -0,0 +1,147 @@
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#include <string.h>
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#include <stdio.h>
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#include <gst/gst.h>
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#include <gst/video/colorbalance.h>
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typedef struct _CustomData {
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GstElement *pipeline;
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GMainLoop *loop;
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} CustomData;
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/* Process a color balance command */
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static void update_color_channel (const gchar *channel_name, gboolean increase, GstColorBalance *cb) {
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gdouble step;
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gint value;
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GstColorBalanceChannel *channel = NULL;
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const GList *channels, *l;
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/* Retrieve the list of channels and locate the requested one */
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channels = gst_color_balance_list_channels (cb);
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for (l = channels; l != NULL; l = l->next) {
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GstColorBalanceChannel *tmp = (GstColorBalanceChannel *)l->data;
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if (g_strrstr (tmp->label, channel_name)) {
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channel = tmp;
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break;
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}
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}
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if (!channel)
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return;
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/* Change the channel's value */
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step = 0.1 * (channel->max_value - channel->min_value);
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value = gst_color_balance_get_value (cb, channel);
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if (increase) {
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value = (gint)(value + step);
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if (value > channel->max_value)
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value = channel->max_value;
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} else {
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value = (gint)(value - step);
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if (value < channel->min_value)
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value = channel->min_value;
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}
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gst_color_balance_set_value (cb, channel, value);
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}
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/* Output the current values of all Color Balance channels */
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static void print_current_values (GstElement *pipeline) {
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const GList *channels, *l;
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/* Output Color Balance values */
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channels = gst_color_balance_list_channels (GST_COLOR_BALANCE (pipeline));
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for (l = channels; l != NULL; l = l->next) {
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GstColorBalanceChannel *channel = (GstColorBalanceChannel *)l->data;
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gint value = gst_color_balance_get_value (GST_COLOR_BALANCE (pipeline), channel);
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g_print ("%s: %3d%% ", channel->label,
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100 * (value - channel->min_value) / (channel->max_value - channel->min_value));
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}
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g_print ("\n");
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}
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/* Process keyboard input */
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static gboolean handle_keyboard (GIOChannel *source, GIOCondition cond, CustomData *data) {
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gchar *str = NULL;
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if (g_io_channel_read_line (source, &str, NULL, NULL, NULL) != G_IO_STATUS_NORMAL) {
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return TRUE;
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}
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switch (g_ascii_tolower (str[0])) {
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case 'c':
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update_color_channel ("CONTRAST", g_ascii_isupper (str[0]), GST_COLOR_BALANCE (data->pipeline));
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break;
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case 'b':
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update_color_channel ("BRIGHTNESS", g_ascii_isupper (str[0]), GST_COLOR_BALANCE (data->pipeline));
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break;
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case 'h':
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update_color_channel ("HUE", g_ascii_isupper (str[0]), GST_COLOR_BALANCE (data->pipeline));
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break;
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case 's':
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update_color_channel ("SATURATION", g_ascii_isupper (str[0]), GST_COLOR_BALANCE (data->pipeline));
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break;
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case 'q':
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g_main_loop_quit (data->loop);
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break;
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default:
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break;
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}
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g_free (str);
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print_current_values (data->pipeline);
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return TRUE;
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}
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int main(int argc, char *argv[]) {
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CustomData data;
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GstStateChangeReturn ret;
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GIOChannel *io_stdin;
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/* Initialize GStreamer */
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gst_init (&argc, &argv);
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/* Initialize our data structure */
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memset (&data, 0, sizeof (data));
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/* Print usage map */
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g_print (
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"USAGE: Choose one of the following options, then press enter:\n"
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" 'C' to increase contrast, 'c' to decrease contrast\n"
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" 'B' to increase brightness, 'b' to decrease brightness\n"
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" 'H' to increase hue, 'h' to decrease hue\n"
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" 'S' to increase saturation, 's' to decrease saturation\n"
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" 'Q' to quit\n");
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/* Build the pipeline */
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data.pipeline = gst_parse_launch ("playbin uri=file:///home/ye/Music/1.wav", NULL);
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/* Add a keyboard watch so we get notified of keystrokes */
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#ifdef G_OS_WIN32
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io_stdin = g_io_channel_win32_new_fd (fileno (stdin));
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#else
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io_stdin = g_io_channel_unix_new (fileno (stdin));
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#endif
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g_io_add_watch (io_stdin, G_IO_IN, (GIOFunc)handle_keyboard, &data);
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/* Start playing */
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ret = gst_element_set_state (data.pipeline, GST_STATE_PLAYING);
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if (ret == GST_STATE_CHANGE_FAILURE) {
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g_printerr ("Unable to set the pipeline to the playing state.\n");
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gst_object_unref (data.pipeline);
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return -1;
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}
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print_current_values (data.pipeline);
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/* Create a GLib Main Loop and set it to run */
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data.loop = g_main_loop_new (NULL, FALSE);
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g_main_loop_run (data.loop);
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/* Free resources */
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g_main_loop_unref (data.loop);
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g_io_channel_unref (io_stdin);
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gst_element_set_state (data.pipeline, GST_STATE_NULL);
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gst_object_unref (data.pipeline);
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return 0;
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}
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@@ -0,0 +1,9 @@
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SRC = $(wildcard *.c)
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TARGET = $(patsubst %.c, %, $(SRC))
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all: $(TARGET)
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%:%.c
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gcc -o $@ $< `pkg-config --libs --cflags gstreamer-1.0`
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clean:
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rm -f $(TARGET)
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@@ -0,0 +1,90 @@
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#include <gst/gst.h>
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/* playbin flags */
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typedef enum {
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GST_PLAY_FLAG_VIS = (1 << 3) /* Enable rendering of visualizations when there is no video stream. */
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} GstPlayFlags;
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/* Return TRUE if this is a Visualization element */
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static gboolean filter_vis_features (GstPluginFeature *feature, gpointer data) {
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GstElementFactory *factory;
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if (!GST_IS_ELEMENT_FACTORY (feature))
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return FALSE;
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factory = GST_ELEMENT_FACTORY (feature);
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if (!g_strrstr (gst_element_factory_get_klass (factory), "Visualization"))
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return FALSE;
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return TRUE;
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}
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int main(int argc, char *argv[]) {
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GstElement *pipeline, *vis_plugin;
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GstBus *bus;
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GstMessage *msg;
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GList *list, *walk;
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GstElementFactory *selected_factory = NULL;
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guint flags;
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/* Initialize GStreamer */
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gst_init (&argc, &argv);
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/* Get a list of all visualization plugins */
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list = gst_registry_feature_filter (gst_registry_get (), filter_vis_features, FALSE, NULL);
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/* Print their names */
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g_print("Available visualization plugins:\n");
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for (walk = list; walk != NULL; walk = g_list_next (walk)) {
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const gchar *name;
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GstElementFactory *factory;
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factory = GST_ELEMENT_FACTORY (walk->data);
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name = gst_element_factory_get_longname (factory);
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g_print(" %s\n", name);
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if (selected_factory == NULL || g_str_has_prefix (name, "GOOM")) {
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selected_factory = factory;
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}
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}
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/* Don't use the factory if it's still empty */
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/* e.g. no visualization plugins found */
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if (!selected_factory) {
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g_print ("No visualization plugins found!\n");
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return -1;
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}
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/* We have now selected a factory for the visualization element */
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g_print ("Selected '%s'\n", gst_element_factory_get_longname (selected_factory));
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vis_plugin = gst_element_factory_create (selected_factory, NULL);
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if (!vis_plugin)
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return -1;
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/* Build the pipeline */
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pipeline = gst_parse_launch ("playbin uri=file:///home/ye/Music/1.wav", NULL);
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/* Set the visualization flag */
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g_object_get (pipeline, "flags", &flags, NULL);
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flags |= GST_PLAY_FLAG_VIS;
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g_object_set (pipeline, "flags", flags, NULL);
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/* set vis plugin for playbin */
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g_object_set (pipeline, "vis-plugin", vis_plugin, NULL);
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/* Start playing */
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gst_element_set_state (pipeline, GST_STATE_PLAYING);
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/* Wait until error or EOS */
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bus = gst_element_get_bus (pipeline);
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msg = gst_bus_timed_pop_filtered (bus, GST_CLOCK_TIME_NONE, GST_MESSAGE_ERROR | GST_MESSAGE_EOS);
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/* Free resources */
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if (msg != NULL)
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gst_message_unref (msg);
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gst_plugin_feature_list_free (list);
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gst_object_unref (bus);
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gst_element_set_state (pipeline, GST_STATE_NULL);
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gst_object_unref (pipeline);
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return 0;
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}
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@@ -0,0 +1,9 @@
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SRC = $(wildcard *.c)
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TARGET = $(patsubst %.c, %, $(SRC))
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all: $(TARGET)
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%:%.c
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gcc -o $@ $< `pkg-config --libs --cflags gstreamer-1.0`
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clean:
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rm -f $(TARGET)
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Executable
BIN
Binary file not shown.
@@ -0,0 +1,56 @@
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#include <gst/gst.h>
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|
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int main(int argc, char *argv[]) {
|
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GstElement *pipeline, *bin, *equalizer, *convert, *sink;
|
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GstPad *pad, *ghost_pad;
|
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GstBus *bus;
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GstMessage *msg;
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/* Initialize GStreamer */
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gst_init (&argc, &argv);
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/* Build the pipeline */
|
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pipeline = gst_parse_launch ("playbin uri=file:///home/ye/Music/6.wav", 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 playbin'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;
|
||||
}
|
||||
|
||||
@@ -0,0 +1,5 @@
|
||||
Abstract:
|
||||
*4: rate of progress we can see.
|
||||
5: color balance manually.
|
||||
*6: audio visualization.
|
||||
7: custom playbin sinks.
|
||||
Reference in New Issue
Block a user