mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2025-04-26 06:54:49 +00:00
Added basic tutorial 6
This commit is contained in:
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parent
a8e8e02ef2
commit
589218bd13
4 changed files with 300 additions and 0 deletions
203
gst-sdk/tutorials/basic-tutorial-6.c
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203
gst-sdk/tutorials/basic-tutorial-6.c
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#include <gst/gst.h>
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/* Functions below print the Capabilities in a human-friendly format */
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static gboolean print_field (GQuark field, const GValue * value, gpointer pfx) {
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gchar *str = gst_value_serialize (value);
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g_print ("%s %15s: %s\n", (gchar *) pfx, g_quark_to_string (field), str);
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g_free (str);
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return TRUE;
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}
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static void print_caps (const GstCaps * caps, const gchar * pfx) {
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guint i;
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g_return_if_fail (caps != NULL);
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if (gst_caps_is_any (caps)) {
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g_print ("%sANY\n", pfx);
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return;
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}
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if (gst_caps_is_empty (caps)) {
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g_print ("%sEMPTY\n", pfx);
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return;
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}
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for (i = 0; i < gst_caps_get_size (caps); i++) {
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GstStructure *structure = gst_caps_get_structure (caps, i);
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g_print ("%s%s\n", pfx, gst_structure_get_name (structure));
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gst_structure_foreach (structure, print_field, (gpointer) pfx);
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}
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}
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/* Prints information about a Pad Template, including its Capabilities */
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static void print_pad_templates_information (GstElementFactory * factory) {
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const GList *pads;
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GstStaticPadTemplate *padtemplate;
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g_print ("Pad Templates for %s:\n", gst_element_factory_get_longname (factory));
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if (!factory->numpadtemplates) {
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g_print (" none\n");
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return;
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}
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pads = factory->staticpadtemplates;
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while (pads) {
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padtemplate = (GstStaticPadTemplate *) (pads->data);
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pads = g_list_next (pads);
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if (padtemplate->direction == GST_PAD_SRC)
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g_print (" SRC template: '%s'\n", padtemplate->name_template);
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else if (padtemplate->direction == GST_PAD_SINK)
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g_print (" SINK template: '%s'\n", padtemplate->name_template);
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else
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g_print (" UNKNOWN!!! template: '%s'\n", padtemplate->name_template);
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if (padtemplate->presence == GST_PAD_ALWAYS)
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g_print (" Availability: Always\n");
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else if (padtemplate->presence == GST_PAD_SOMETIMES)
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g_print (" Availability: Sometimes\n");
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else if (padtemplate->presence == GST_PAD_REQUEST) {
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g_print (" Availability: On request\n");
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} else
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g_print (" Availability: UNKNOWN!!!\n");
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if (padtemplate->static_caps.string) {
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g_print (" Capabilities:\n");
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print_caps (gst_static_caps_get (&padtemplate->static_caps), " ");
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}
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g_print ("\n");
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}
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}
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/* Shows the CURRENT capabilities of the requested pad in the given element */
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static void print_pad_capabilities (GstElement *element, gchar *pad_name) {
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GstPad *pad = NULL;
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GstCaps *caps = NULL;
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/* Retrieve pad */
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pad = gst_element_get_static_pad (element, pad_name);
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if (!pad) {
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g_printerr ("Could not retrieve pad '%s'\n", pad_name);
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return;
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}
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/* Retrieve negotiated caps (or acceptable caps if negotiation is not finished yet) */
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caps = gst_pad_get_negotiated_caps (pad);
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if (!caps)
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caps = gst_pad_get_caps_reffed (pad);
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/* Print and free */
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g_print ("Caps for the %s pad:\n", pad_name);
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print_caps (caps, " ");
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gst_caps_unref (caps);
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gst_object_unref (pad);
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}
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int main(int argc, char *argv[]) {
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GstElement *pipeline, *source, *sink;
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GstElementFactory *source_factory, *sink_factory;
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GstBus *bus;
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GstMessage *msg;
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GstStateChangeReturn ret;
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gboolean terminate = FALSE;
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/* Initialize GStreamer */
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gst_init (&argc, &argv);
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/* Create the element factories */
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source_factory = gst_element_factory_find ("audiotestsrc");
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sink_factory = gst_element_factory_find ("autoaudiosink");
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if (!source_factory || !sink_factory) {
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g_printerr ("Not all element factories could be created.\n");
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return -1;
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}
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/* Print information about the pad templates of these factories */
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print_pad_templates_information (source_factory);
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print_pad_templates_information (sink_factory);
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/* Ask the factories to instantiate actual elements */
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source = gst_element_factory_create (source_factory, "source");
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sink = gst_element_factory_create (sink_factory, "sink");
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/* Create the empty pipeline */
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pipeline = gst_pipeline_new ("test-pipeline");
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if (!pipeline || !source || !sink) {
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g_printerr ("Not all elements could be created.\n");
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return -1;
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}
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/* Build the pipeline */
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gst_bin_add_many (GST_BIN (pipeline), source, sink, NULL);
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if (gst_element_link (source, sink) != TRUE) {
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g_printerr ("Elements could not be linked.\n");
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gst_object_unref (pipeline);
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return -1;
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}
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/* Print initial negotiated caps (in NULL state) */
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g_print ("In NULL state:\n");
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print_pad_capabilities (sink, "sink");
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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 (check the bus for error messages).\n");
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}
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/* Wait until error, EOS or State Change */
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bus = gst_element_get_bus (pipeline);
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do {
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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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GST_MESSAGE_STATE_CHANGED);
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/* Parse message */
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if (msg != NULL) {
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GError *err;
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gchar *debug_info;
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switch (GST_MESSAGE_TYPE (msg)) {
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case GST_MESSAGE_ERROR:
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gst_message_parse_error (msg, &err, &debug_info);
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g_printerr ("Error received from element %s: %s\n", GST_OBJECT_NAME (msg->src), err->message);
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g_printerr ("Debugging information: %s\n", debug_info ? debug_info : "none");
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g_clear_error (&err);
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g_free (debug_info);
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terminate = TRUE;
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break;
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case GST_MESSAGE_EOS:
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g_print ("End-Of-Stream reached.\n");
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terminate = TRUE;
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break;
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case GST_MESSAGE_STATE_CHANGED:
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/* We are only interested in state-changed messages from the pipeline */
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if (GST_MESSAGE_SRC (msg) == GST_OBJECT (pipeline)) {
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GstState old_state, new_state, pending_state;
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gst_message_parse_state_changed (msg, &old_state, &new_state, &pending_state);
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g_print ("\nPipeline state changed from %s to %s:\n",
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gst_element_state_get_name (old_state), gst_element_state_get_name (new_state));
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/* Print the current capabilities of the sink element */
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print_pad_capabilities (sink, "sink");
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}
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break;
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default:
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/* We should not reach here because we only asked for ERRORs, EOS and STATE_CHANGED */
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g_printerr ("Unexpected message received.\n");
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break;
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}
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gst_message_unref (msg);
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}
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} while (!terminate);
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/* Free resources */
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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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gst_object_unref (source_factory);
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gst_object_unref (sink_factory);
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return 0;
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}
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85
vs/2010/tutorials/basic-tutorial-6/basic-tutorial-6.vcxproj
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85
vs/2010/tutorials/basic-tutorial-6/basic-tutorial-6.vcxproj
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@ -0,0 +1,85 @@
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<?xml version="1.0" encoding="utf-8"?>
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<Project DefaultTargets="Build" ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
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<ItemGroup Label="ProjectConfigurations">
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<ProjectConfiguration Include="Debug|Win32">
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<Configuration>Debug</Configuration>
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<Platform>Win32</Platform>
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</ProjectConfiguration>
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<ProjectConfiguration Include="Release|Win32">
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<Configuration>Release</Configuration>
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<Platform>Win32</Platform>
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</ProjectConfiguration>
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</ItemGroup>
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<PropertyGroup Label="Globals">
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<ProjectGuid>{A2A55F96-F759-4AF6-84EB-96ABD9D82410}</ProjectGuid>
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<Keyword>Win32Proj</Keyword>
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<RootNamespace>basictutorial6</RootNamespace>
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</PropertyGroup>
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<Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
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<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'" Label="Configuration">
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<ConfigurationType>Application</ConfigurationType>
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<UseDebugLibraries>true</UseDebugLibraries>
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</PropertyGroup>
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<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
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<ConfigurationType>Application</ConfigurationType>
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<UseDebugLibraries>false</UseDebugLibraries>
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<WholeProgramOptimization>true</WholeProgramOptimization>
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<CharacterSet>Unicode</CharacterSet>
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</PropertyGroup>
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<Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
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<ImportGroup Label="ExtensionSettings">
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</ImportGroup>
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<ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
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<Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
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<Import Project="..\..\libs\gstreamer-0.10.props" />
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<Import Project="..\..\libs\msvc\x86.props" />
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</ImportGroup>
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<ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
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<Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
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<Import Project="..\..\libs\gstreamer-0.10.props" />
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<Import Project="..\..\libs\msvc\x86.props" />
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</ImportGroup>
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<PropertyGroup Label="UserMacros" />
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<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
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<LinkIncremental>true</LinkIncremental>
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</PropertyGroup>
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<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
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<LinkIncremental>false</LinkIncremental>
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</PropertyGroup>
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<ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
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<ClCompile>
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<PrecompiledHeader>
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</PrecompiledHeader>
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<WarningLevel>Level3</WarningLevel>
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<Optimization>Disabled</Optimization>
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<PreprocessorDefinitions>WIN32;_DEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
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</ClCompile>
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<Link>
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<SubSystem>Console</SubSystem>
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<GenerateDebugInformation>true</GenerateDebugInformation>
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</Link>
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</ItemDefinitionGroup>
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<ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
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<ClCompile>
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<WarningLevel>Level3</WarningLevel>
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<PrecompiledHeader>
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</PrecompiledHeader>
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<Optimization>MaxSpeed</Optimization>
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<FunctionLevelLinking>true</FunctionLevelLinking>
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<IntrinsicFunctions>true</IntrinsicFunctions>
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<PreprocessorDefinitions>WIN32;NDEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
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</ClCompile>
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<Link>
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<SubSystem>Console</SubSystem>
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<GenerateDebugInformation>true</GenerateDebugInformation>
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<EnableCOMDATFolding>true</EnableCOMDATFolding>
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<OptimizeReferences>true</OptimizeReferences>
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</Link>
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</ItemDefinitionGroup>
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<ItemGroup>
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<ClCompile Include="..\..\..\..\gst-sdk\tutorials\basic-tutorial-6.c" />
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</ItemGroup>
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<Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
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<ImportGroup Label="ExtensionTargets">
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</ImportGroup>
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</Project>
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@ -0,0 +1,6 @@
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<?xml version="1.0" encoding="utf-8"?>
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<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
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<ItemGroup>
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<ClCompile Include="..\..\..\..\gst-sdk\tutorials\basic-tutorial-6.c" />
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</ItemGroup>
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</Project>
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@ -15,6 +15,8 @@ Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "playback-tutorial-1", "play
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EndProject
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EndProject
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Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "playback-tutorial-2", "playback-tutorial-2\playback-tutorial-2.vcxproj", "{4319F5D7-039A-44B5-B1A7-507DC627B24D}"
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Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "playback-tutorial-2", "playback-tutorial-2\playback-tutorial-2.vcxproj", "{4319F5D7-039A-44B5-B1A7-507DC627B24D}"
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EndProject
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EndProject
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Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "basic-tutorial-6", "basic-tutorial-6\basic-tutorial-6.vcxproj", "{A2A55F96-F759-4AF6-84EB-96ABD9D82410}"
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EndProject
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Global
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Global
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GlobalSection(SolutionConfigurationPlatforms) = preSolution
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GlobalSection(SolutionConfigurationPlatforms) = preSolution
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Debug|Win32 = Debug|Win32
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Debug|Win32 = Debug|Win32
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@ -49,6 +51,10 @@ Global
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{4319F5D7-039A-44B5-B1A7-507DC627B24D}.Debug|Win32.Build.0 = Debug|Win32
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{4319F5D7-039A-44B5-B1A7-507DC627B24D}.Debug|Win32.Build.0 = Debug|Win32
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{4319F5D7-039A-44B5-B1A7-507DC627B24D}.Release|Win32.ActiveCfg = Release|Win32
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{4319F5D7-039A-44B5-B1A7-507DC627B24D}.Release|Win32.ActiveCfg = Release|Win32
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{4319F5D7-039A-44B5-B1A7-507DC627B24D}.Release|Win32.Build.0 = Release|Win32
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{4319F5D7-039A-44B5-B1A7-507DC627B24D}.Release|Win32.Build.0 = Release|Win32
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{A2A55F96-F759-4AF6-84EB-96ABD9D82410}.Debug|Win32.ActiveCfg = Debug|Win32
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{A2A55F96-F759-4AF6-84EB-96ABD9D82410}.Debug|Win32.Build.0 = Debug|Win32
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{A2A55F96-F759-4AF6-84EB-96ABD9D82410}.Release|Win32.ActiveCfg = Release|Win32
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{A2A55F96-F759-4AF6-84EB-96ABD9D82410}.Release|Win32.Build.0 = Release|Win32
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EndGlobalSection
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EndGlobalSection
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GlobalSection(SolutionProperties) = preSolution
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GlobalSection(SolutionProperties) = preSolution
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HideSolutionNode = FALSE
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HideSolutionNode = FALSE
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