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Here is an example that uses the pipe wrapper with a Gstreamer pipeline.

For each decoded frame in the Gstreamer thread, a handle is called in the ecore thread.

//Compile with:
// gcc -o ecore_pipe_gstreamer_example ecore_pipe_gstreamer_example.c `pkg-config --libs --cflags ecore gstreamer-1.0`
// or
// gcc -o ecore_pipe_gstreamer_example ecore_pipe_gstreamer_example.c `pkg-config --libs --cflags ecore gstreamer-0.10`
#include <gst/gst.h>
#include <Ecore.h>
static int nbr = 0;
static GstElement *_build_pipeline(gchar *filename, Ecore_Pipe *pipe);
static void new_decoded_pad_cb(GstElement *demuxer,
GstPad *new_pad,
gpointer user_data);
static void
handler(void *data, void *buf, unsigned int len EINA_UNUSED)
{
GstBuffer *buffer = *((GstBuffer **)buf);
printf("handler : %p\n", buffer);
printf("frame : %d %p %lld %p\n", nbr++, data, (long long)GST_BUFFER_DURATION(buffer), buffer);
gst_buffer_unref(buffer);
}
static void
handoff(GstElement *object EINA_UNUSED,
GstBuffer *arg0,
GstPad *arg1 EINA_UNUSED,
gpointer user_data)
{
Ecore_Pipe *pipe;
pipe = (Ecore_Pipe *)user_data;
printf("handoff : %p\n", arg0);
gst_buffer_ref(arg0);
ecore_pipe_write(pipe, &arg0, sizeof(arg0));
}
int
main(int argc, char *argv[])
{
GstElement *pipeline;
char *filename;
Ecore_Pipe *pipe;
gst_init(&argc, &argv);
if (!ecore_init())
{
gst_deinit();
return 0;
}
pipe = ecore_pipe_add(handler, NULL);
if (!pipe)
{
ecore_shutdown();
gst_deinit();
return 0;
}
if (argc < 2)
{
g_print("usage: %s file.avi\n", argv[0]);
ecore_pipe_del(pipe);
ecore_shutdown();
gst_deinit();
return 0;
}
filename = argv[1];
pipeline = _build_pipeline(filename, pipe);
if (!pipeline)
{
g_print("Error during the pipeline building\n");
ecore_pipe_del(pipe);
ecore_shutdown();
gst_deinit();
return -1;
}
gst_element_set_state(pipeline, GST_STATE_PLAYING);
ecore_main_loop_begin();
ecore_pipe_del(pipe);
ecore_shutdown();
gst_deinit();
return 0;
}
static void
new_decoded_pad_cb(GstElement *demuxer EINA_UNUSED,
GstPad *new_pad,
gpointer user_data)
{
GstElement *decoder;
GstPad *pad;
GstCaps *caps;
GstStructure *s;
const gchar *str;
#if GST_CHECK_VERSION(1,0,0)
caps = gst_pad_get_current_caps(new_pad);
#else
caps = gst_pad_get_caps(new_pad);
#endif
s = gst_caps_get_structure(caps, 0);
str = gst_structure_get_name(s);
if (g_str_has_prefix(str, "video/"))
{
decoder = GST_ELEMENT(user_data);
#if GST_CHECK_VERSION(1,0,0)
pad = gst_element_get_static_pad(decoder, "sink");
#else
pad = gst_element_get_pad(decoder, "sink");
#endif
if (GST_PAD_LINK_FAILED(gst_pad_link(new_pad, pad)))
{
g_warning("Failed to link %s:%s to %s:%s", GST_DEBUG_PAD_NAME(new_pad),
GST_DEBUG_PAD_NAME(pad));
}
gst_object_unref(pad);
}
gst_caps_unref(caps);
}
static GstElement *
_build_pipeline(gchar *filename, Ecore_Pipe *pipe)
{
GstElement *pipeline;
GstElement *filesrc;
GstElement *demuxer;
GstElement *decoder;
GstElement *sink;
GstStateChangeReturn res;
pipeline = gst_pipeline_new("pipeline");
if (!pipeline)
return NULL;
filesrc = gst_element_factory_make("filesrc", "filesrc");
if (!filesrc)
{
printf("no filesrc");
goto failure;
}
g_object_set(G_OBJECT(filesrc), "location", filename, NULL);
demuxer = gst_element_factory_make("oggdemux", "demuxer");
if (!demuxer)
{
printf("no demux");
goto failure;
}
decoder = gst_element_factory_make("theoradec", "decoder");
if (!decoder)
{
printf("no dec");
goto failure;
}
g_signal_connect(demuxer, "pad-added",
G_CALLBACK(new_decoded_pad_cb), decoder);
sink = gst_element_factory_make("fakesink", "sink");
if (!sink)
{
printf("no sink");
goto failure;
}
g_object_set(G_OBJECT(sink), "sync", EINA_TRUE, NULL);
g_object_set(G_OBJECT(sink), "signal-handoffs", EINA_TRUE, NULL);
g_signal_connect(sink, "handoff",
G_CALLBACK(handoff), pipe);
gst_bin_add_many(GST_BIN(pipeline),
filesrc, demuxer, decoder, sink, NULL);
if (!gst_element_link(filesrc, demuxer))
goto failure;
if (!gst_element_link(decoder, sink))
goto failure;
res = gst_element_set_state(pipeline, GST_STATE_PAUSED);
if (res == GST_STATE_CHANGE_FAILURE)
goto failure;
res = gst_element_get_state(pipeline, NULL, NULL, GST_CLOCK_TIME_NONE);
if (res != GST_STATE_CHANGE_SUCCESS)
goto failure;
return pipeline;
failure:
gst_object_unref(GST_OBJECT(pipeline));
return NULL;
}