gstreamer/gst/gstpipeline.c

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/* Gnome-Streamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include <gst/gstpipeline.h>
#include <gst/gstthread.h>
#include <gst/gstsink.h>
#include <gst/gstutils.h>
#include <gst/gsttype.h>
#include "config.h"
GstElementDetails gst_pipeline_details = {
"Pipeline object",
"Bin",
"Complete pipeline object",
VERSION,
"Erik Walthinsen <omega@cse.ogi.edu>",
"(C) 1999",
};
/* Pipeline signals and args */
enum {
/* FILL ME */
LAST_SIGNAL
};
enum {
ARG_0,
/* FILL ME */
};
static void gst_pipeline_class_init(GstPipelineClass *klass);
static void gst_pipeline_init(GstPipeline *pipeline);
static GstElementStateReturn gst_pipeline_change_state(GstElement *element);
static void gst_pipeline_prepare(GstPipeline *pipeline);
static void gst_pipeline_have_type(GstSink *sink, GstSink *sink2, gpointer data);
static void gst_pipeline_pads_autoplug(GstElement *src, GstElement *sink);
static GstBin *parent_class = NULL;
//static guint gst_pipeline_signals[LAST_SIGNAL] = { 0 };
GtkType
gst_pipeline_get_type(void) {
static GtkType pipeline_type = 0;
if (!pipeline_type) {
static const GtkTypeInfo pipeline_info = {
"GstPipeline",
sizeof(GstPipeline),
sizeof(GstPipelineClass),
(GtkClassInitFunc)gst_pipeline_class_init,
(GtkObjectInitFunc)gst_pipeline_init,
(GtkArgSetFunc)NULL,
(GtkArgGetFunc)NULL,
(GtkClassInitFunc)NULL,
};
pipeline_type = gtk_type_unique(gst_bin_get_type(),&pipeline_info);
}
return pipeline_type;
}
static void
gst_pipeline_class_init(GstPipelineClass *klass) {
GstElementClass *gstelement_class;
gstelement_class = (GstElementClass*)klass;
parent_class = gtk_type_class(gst_bin_get_type());
gstelement_class->change_state = gst_pipeline_change_state;
gstelement_class->elementfactory = gst_elementfactory_find("pipeline");
}
static void gst_pipeline_init(GstPipeline *pipeline) {
pipeline->src = NULL;
pipeline->sinks = NULL;
}
/**
* gst_pipeline_new:
* @name: name of new pipeline
*
* Create a new pipeline with the given name.
*
* Returns: newly created GstPipeline
*/
GstElement *gst_pipeline_new(guchar *name) {
GstPipeline *pipeline;
pipeline = gtk_type_new(gst_pipeline_get_type());
gst_element_set_name(GST_ELEMENT(pipeline),name);
return GST_ELEMENT(pipeline);
}
static void gst_pipeline_prepare(GstPipeline *pipeline) {
g_print("GstPipeline: preparing pipeline \"%s\" for playing\n",
gst_element_get_name(GST_ELEMENT(pipeline)));
}
static void gst_pipeline_have_type(GstSink *sink, GstSink *sink2, gpointer data) {
g_print("GstPipeline: pipeline have type %p\n", (gboolean *)data);
*(gboolean *)data = TRUE;
}
static guint16 gst_pipeline_typefind(GstPipeline *pipeline, GstElement *element) {
gboolean found = FALSE;
GstElement *typefind;
guint16 type_id = 0;
g_print("GstPipeline: typefind for element \"%s\" %p\n",
gst_element_get_name(element), &found);
typefind = gst_elementfactory_make("typefind","typefind");
g_return_val_if_fail(typefind != NULL, FALSE);
gtk_signal_connect(GTK_OBJECT(typefind),"have_type",
GTK_SIGNAL_FUNC(gst_pipeline_have_type), &found);
gst_pad_connect(gst_element_get_pad(element,"src"),
gst_element_get_pad(typefind,"sink"));
gst_bin_add(GST_BIN(pipeline), typefind);
gst_bin_create_plan(GST_BIN(pipeline));
gst_element_set_state(GST_ELEMENT(element),GST_STATE_READY);
gst_element_set_state(GST_ELEMENT(element),GST_STATE_PLAYING);
// keep pushing buffers... the have_type signal handler will set the found flag
while (!found) {
gst_src_push(GST_SRC(element));
}
gst_element_set_state(GST_ELEMENT(element),GST_STATE_NULL);
if (found) {
type_id = gst_util_get_int_arg(GTK_OBJECT(typefind),"type");
gst_pad_set_type_id(gst_element_get_pad(element, "src"), type_id);
}
gst_pad_disconnect(gst_element_get_pad(element,"src"),
gst_element_get_pad(typefind,"sink"));
gst_bin_remove(GST_BIN(pipeline), typefind);
gst_object_unref(GST_OBJECT(typefind));
return type_id;
}
static void gst_pipeline_pads_autoplug_func(GstElement *src, GstPad *pad, GstElement *sink) {
GList *sinkpads;
GstPad *sinkpad;
gboolean connected = FALSE;
g_print("gstpipeline: autoplug pad connect function type %d for \"%s\" to \"%s\"\n", pad->type,
gst_element_get_name(src), gst_element_get_name(sink));
sinkpads = gst_element_get_pad_list(sink);
while (sinkpads) {
sinkpad = (GstPad *)sinkpads->data;
// if we have a match, connect the pads
if (sinkpad->type == pad->type &&
sinkpad->direction == GST_PAD_SINK &&
!GST_PAD_CONNECTED(sinkpad))
{
gst_pad_connect(pad, sinkpad);
g_print("gstpipeline: autoconnect pad \"%s\" (%d) in element %s <-> ", pad->name,
pad->type, gst_element_get_name(src));
g_print("pad \"%s\" (%d) in element %s\n", sinkpad->name, sinkpad->type,
gst_element_get_name(sink));
connected = TRUE;
break;
}
sinkpads = g_list_next(sinkpads);
}
if (!connected) {
g_print("gstpipeline: no path to sinks for type %d\n", pad->type);
}
}
static void gst_pipeline_pads_autoplug(GstElement *src, GstElement *sink) {
GList *srcpads, *sinkpads;
gboolean connected = FALSE;
srcpads = gst_element_get_pad_list(src);
while (srcpads) {
GstPad *srcpad = (GstPad *)srcpads->data;
GstPad *sinkpad;
if (srcpad->direction == GST_PAD_SRC && !GST_PAD_CONNECTED(srcpad)) {
sinkpads = gst_element_get_pad_list(sink);
// FIXME could O(n) if the types were sorted...
while (sinkpads) {
sinkpad = (GstPad *)sinkpads->data;
// if we have a match, connect the pads
if (sinkpad->type == srcpad->type &&
sinkpad->direction == GST_PAD_SINK &&
!GST_PAD_CONNECTED(sinkpad)) {
gst_pad_connect(srcpad, sinkpad);
g_print("gstpipeline: autoconnect pad \"%s\" (%d) in element %s <-> ",
srcpad->name, srcpad->type, gst_element_get_name(src));
g_print("pad \"%s\" (%d) in element %s\n", sinkpad->name,
sinkpad->type, gst_element_get_name(sink));
connected = TRUE;
goto end;
}
sinkpads = g_list_next(sinkpads);
}
}
srcpads = g_list_next(srcpads);
}
end:
if (!connected) {
g_print("gstpipeline: delaying pad connections\n");
gtk_signal_connect(GTK_OBJECT(src),"new_pad",
GTK_SIGNAL_FUNC(gst_pipeline_pads_autoplug_func), sink);
}
}
/**
* gst_pipeline_add_src:
* @pipeline: the pipeline to add the src to
* @src: the src to add to the pipeline
*
* Adds a src element to the pipeline. This element
* will be used as a src for autoplugging. If you add more
* than one src element, the previously added element will
* be removed.
*/
void gst_pipeline_add_src(GstPipeline *pipeline, GstElement *src)
{
g_return_if_fail(pipeline != NULL);
g_return_if_fail(GST_IS_PIPELINE(pipeline));
g_return_if_fail(src != NULL);
g_return_if_fail(GST_IS_ELEMENT(src));
if (pipeline->src) {
printf("gstpipeline: *WARNING* removing previously added element \"%s\"\n",
gst_element_get_name(pipeline->src));
gst_bin_remove(GST_BIN(pipeline), pipeline->src);
}
pipeline->src = src;
gst_bin_add(GST_BIN(pipeline), src);
}
/**
* gst_pipeline_add_sink:
* @pipeline: the pipeline to add the sink to
* @sink: the sink to add to the pipeline
*
* Adds a sink element to the pipeline. This element
* will be used as a sink for autoplugging
*/
void gst_pipeline_add_sink(GstPipeline *pipeline, GstElement *sink)
{
g_return_if_fail(pipeline != NULL);
g_return_if_fail(GST_IS_PIPELINE(pipeline));
g_return_if_fail(sink != NULL);
g_return_if_fail(GST_IS_ELEMENT(sink));
pipeline->sinks = g_list_prepend(pipeline->sinks, sink);
//gst_bin_add(GST_BIN(pipeline), sink);
}
/**
* gst_pipeline_autoplug:
* @pipeline: the pipeline to autoplug
*
* Constructs a complete pipeline by automatically
* detecting the plugins needed.
*
* Returns: a gboolean indicating success or failure.
*/
gboolean gst_pipeline_autoplug(GstPipeline *pipeline) {
GList *elements;
GstElement *element, *srcelement = NULL, *sinkelement= NULL;
GList **factories;
GstElementFactory *factory;
GList *src_types;
guint16 src_type = 0, sink_type = 0;
guint i, numsinks;
g_return_val_if_fail(pipeline != NULL, FALSE);
g_return_val_if_fail(GST_IS_PIPELINE(pipeline), FALSE);
g_print("GstPipeline: autopluging pipeline \"%s\"\n",
gst_element_get_name(GST_ELEMENT(pipeline)));
// fase 1, run typedetect on the source if needed...
if (!pipeline->src) {
g_print("GstPipeline: no source detected, can't autoplug pipeline \"%s\"\n",
gst_element_get_name(GST_ELEMENT(pipeline)));
return FALSE;
}
factory = gst_element_get_factory(pipeline->src);
src_types = factory->src_types;
if (src_types == NULL) {
g_print("GstPipeline: source \"%s\" has no MIME type, running typefind...\n",
gst_element_get_name(pipeline->src));
src_type = gst_pipeline_typefind(pipeline, pipeline->src);
if (src_type) {
g_print("GstPipeline: source \"%s\" type found %d\n", gst_element_get_name(pipeline->src),
src_type);
}
else {
g_print("GstPipeline: source \"%s\" has no type\n", gst_element_get_name(pipeline->src));
return FALSE;
}
}
else {
while (src_types) {
// FIXME loop over types and find paths...
src_types = g_list_next(src_types);
}
}
srcelement = pipeline->src;
elements = pipeline->sinks;
numsinks = g_list_length(elements);
factories = g_new0(GList *, numsinks);
i = 0;
// fase 2, loop over all the sinks..
while (elements) {
GList *pads;
GstPad *pad;
element = GST_ELEMENT(elements->data);
pads = gst_element_get_pad_list(element);
while (pads) {
pad = (GstPad *)pads->data;
if (pad->direction == GST_PAD_SINK) {
sink_type = gst_pad_get_type_id(pad);
break;
}
pads = g_list_next(pads);
}
factories[i] = gst_type_get_sink_to_src(src_type, sink_type);
//factories[i] = g_list_append(factories[i], element);
i++;
elements = g_list_next(elements);
}
while (factories[0]) {
// fase 3: add common elements
factory = (GstElementFactory *)(factories[0]->data);
// check to other paths for mathing elements (factories)
for (i=1; i<numsinks; i++) {
if (factory != (GstElementFactory *)(factories[i]->data))
goto differ;
factories[i] = g_list_next(factories[i]);
}
factory = (GstElementFactory *)(factories[0]->data);
g_print("GstPipeline: common factory \"%s\"\n", factory->name);
element = gst_elementfactory_create(factory, factory->name);
gst_bin_add(GST_BIN(pipeline), element);
gst_pipeline_pads_autoplug(srcelement, element);
srcelement = element;
factories[0] = g_list_next(factories[0]);
}
differ:
// loop over all the sink elements
elements = pipeline->sinks;
i = 0;
while (elements) {
GstElement *thesrcelement = srcelement;
GstElement *thebin = GST_ELEMENT(pipeline);
sinkelement = (GstElement *)elements->data;
while (factories[i] || sinkelement) {
// fase 4: add other elements...
if (factories[i]) {
factory = (GstElementFactory *)(factories[i]->data);
g_print("GstPipeline: factory \"%s\"\n", factory->name);
element = gst_elementfactory_create(factory, factory->name);
factories[i] = g_list_next(factories[i]);
}
// we have arived to the final sink element
else {
element = sinkelement;
sinkelement = NULL;
}
// this element suggests the use of a thread, so we set one up...
if (GST_ELEMENT_IS_THREAD_SUGGESTED(element)) {
GstElement *queue;
GList *sinkpads;
GstPad *srcpad, *sinkpad;
g_print("GstPipeline: sugest new thread for \"%s\" %08x\n", element->name, GST_FLAGS(element));
// create a new queue and add to the previous bin
queue = gst_elementfactory_make("queue", g_strconcat("queue_", gst_element_get_name(element), NULL));
gst_bin_add(GST_BIN(pipeline), queue);
// this will be the new bin for all following elements
thebin = gst_thread_new("thread");
srcpad = gst_element_get_pad(queue, "src");
sinkpads = gst_element_get_pad_list(element);
while (sinkpads) {
sinkpad = (GstPad *)sinkpads->data;
// FIXME connect matching pads, not just the first one...
if (sinkpad->direction == GST_PAD_SINK &&
!GST_PAD_CONNECTED(sinkpad)) {
// the queue has the types of the element it connects
srcpad->type = sinkpad->type;
gst_element_get_pad(queue, "sink")->type = sinkpad->type;
gst_pad_connect(srcpad, sinkpad);
g_print("gstpipeline: autoconnect pad \"%s\" (%d) in element %s <-> ",
srcpad->name, srcpad->type, gst_element_get_name(queue));
g_print("pad \"%s\" (%d) in element %s\n", sinkpad->name,
sinkpad->type, gst_element_get_name(element));
break;
}
sinkpads = g_list_next(sinkpads);
}
gst_bin_add(GST_BIN(thebin), element);
gst_bin_add(GST_BIN(pipeline), thebin);
element = queue;
}
// no thread needed, easy case
else {
gst_bin_add(GST_BIN(thebin), element);
}
gst_pipeline_pads_autoplug(thesrcelement, element);
// this element is now the new source element
thesrcelement = element;
}
elements = g_list_next(elements);
i++;
}
return TRUE;
g_print("GstPipeline: unable to autoplug pipeline \"%s\"\n",
gst_element_get_name(GST_ELEMENT(pipeline)));
return FALSE;
}
static GstElementStateReturn gst_pipeline_change_state(GstElement *element) {
GstPipeline *pipeline;
g_return_val_if_fail(GST_IS_PIPELINE(element), FALSE);
pipeline = GST_PIPELINE(element);
switch (GST_STATE_PENDING(pipeline)) {
case GST_STATE_READY:
// we need to set up internal state
gst_pipeline_prepare(pipeline);
break;
default:
break;
}
if (GST_ELEMENT_CLASS(parent_class)->change_state)
return GST_ELEMENT_CLASS(parent_class)->change_state(element);
return GST_STATE_SUCCESS;
}
/**
* gst_pipeline_iterate:
* @pipeline: GstPipeline to iterate
*
* Cause the pipeline's contents to be run through one full 'iteration'.
*/
void gst_pipeline_iterate(GstPipeline *pipeline) {
g_return_if_fail(pipeline != NULL);
g_return_if_fail(GST_IS_PIPELINE(pipeline));
}