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examples/sdlshare: Switch from a GLib main loop to a normal SDL event loop

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This commit is contained in:
Sebastian Dröge 2019-03-12 22:37:48 +01:00
parent 6a5ab50103
commit eb3699a74b
1 changed files with 91 additions and 74 deletions
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165
tests/examples/gl/sdl/sdlshare.c
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@ -41,12 +41,12 @@
static GstGLContext *sdl_context;
static GstGLDisplay *sdl_gl_display;
static guint32 sdl_message_event = -1;
static SDL_Window *sdl_window;
static SDL_GLContext sdl_gl_context;
static GAsyncQueue *queue_input_buf;
static GAsyncQueue *queue_output_buf;
static GMainLoop *loop;
/* rotation angle for the triangle. */
float rtri = 0.0f;
@ -140,33 +140,6 @@ DrawGLScene (GstBuffer * buf)
gst_video_frame_unmap (&v_frame);
}
static gboolean
update_sdl_scene (gpointer data)
{
GstBuffer *buf = (GstBuffer *) g_async_queue_pop (queue_input_buf);
SDL_Event event;
while (SDL_PollEvent (&event)) {
if (event.type == SDL_QUIT) {
g_main_loop_quit (loop);
}
if (event.type == SDL_KEYDOWN) {
if (event.key.keysym.sym == SDLK_ESCAPE) {
g_main_loop_quit (loop);
}
}
}
SDL_GL_MakeCurrent (sdl_window, sdl_gl_context);
DrawGLScene (buf);
SDL_GL_MakeCurrent (sdl_window, NULL);
/* push buffer so it can be unref later */
g_async_queue_push (queue_output_buf, buf);
return G_SOURCE_REMOVE;
}
/* appsink new-sample callback */
static GstFlowReturn
on_new_sample (GstElement * appsink, gpointer data)
@ -185,8 +158,6 @@ on_new_sample (GstElement * appsink, gpointer data)
gst_sample_unref (sample);
g_async_queue_push (queue_input_buf, buf);
if (g_async_queue_length (queue_input_buf) > 3)
g_idle_add (update_sdl_scene, (gpointer) appsink);
/* pop then unref buffer we have finished to use in sdl */
if (g_async_queue_length (queue_output_buf) > 3) {
@ -197,43 +168,6 @@ on_new_sample (GstElement * appsink, gpointer data)
return GST_FLOW_OK;
}
/* gst bus signal watch callback */
static void
end_stream_cb (GstBus * bus, GstMessage * msg, GMainLoop * loop)
{
switch (GST_MESSAGE_TYPE (msg)) {
case GST_MESSAGE_EOS:
g_print ("End-of-stream\n");
g_print
("For more information, try to run: GST_DEBUG=gl*:3 ./sdlshare\n");
break;
case GST_MESSAGE_ERROR:
{
gchar *debug = NULL;
GError *err = NULL;
gst_message_parse_error (msg, &err, &debug);
g_print ("Error: %s\n", err->message);
g_error_free (err);
if (debug) {
g_print ("Debug deails: %s\n", debug);
g_free (debug);
}
break;
}
default:
break;
}
g_main_loop_quit (loop);
}
static void
sync_bus_call (GstBus * bus, GstMessage * msg, gpointer data)
{
@ -262,10 +196,96 @@ sync_bus_call (GstBus * bus, GstMessage * msg, gpointer data)
break;
}
default:
{
SDL_Event event = { 0, };
event.type = sdl_message_event;
SDL_PushEvent (&event);
break;
}
}
}
static void
sdl_event_loop (GstBus * bus)
{
GstBuffer *buf = NULL;
gboolean quit = FALSE;
SDL_GL_MakeCurrent (sdl_window, sdl_gl_context);
SDL_GL_SetSwapInterval (1);
while (!quit) {
SDL_Event event;
while (SDL_PollEvent (&event)) {
if (event.type == SDL_QUIT) {
quit = TRUE;
}
if (event.type == SDL_KEYDOWN) {
if (event.key.keysym.sym == SDLK_ESCAPE) {
quit = TRUE;
}
}
if (event.type == sdl_message_event) {
GstMessage *msg;
while ((msg = gst_bus_pop (bus))) {
switch (GST_MESSAGE_TYPE (msg)) {
case GST_MESSAGE_EOS:
g_print ("End-of-stream\n");
g_print
("For more information, try to run: GST_DEBUG=gl*:3 ./sdlshare\n");
quit = TRUE;
break;
case GST_MESSAGE_ERROR:
{
gchar *debug = NULL;
GError *err = NULL;
gst_message_parse_error (msg, &err, &debug);
g_print ("Error: %s\n", err->message);
g_error_free (err);
if (debug) {
g_print ("Debug deails: %s\n", debug);
g_free (debug);
}
quit = TRUE;
break;
}
default:
break;
}
gst_message_unref (msg);
}
}
}
while (g_async_queue_length (queue_input_buf) > 3) {
if (buf)
g_async_queue_push (queue_output_buf, buf);
buf = (GstBuffer *) g_async_queue_pop (queue_input_buf);
}
if (buf)
DrawGLScene (buf);
}
SDL_GL_MakeCurrent (sdl_window, NULL);
if (buf)
g_async_queue_push (queue_output_buf, buf);
}
int
main (int argc, char **argv)
{
@ -291,6 +311,9 @@ main (int argc, char **argv)
return -1;
}
sdl_message_event = SDL_RegisterEvents (1);
g_assert (sdl_message_event != -1);
/* Create a 640x480 OpenGL window */
sdl_window =
SDL_CreateWindow ("SDL and gst-plugins-gl", SDL_WINDOWPOS_UNDEFINED,
@ -304,7 +327,6 @@ main (int argc, char **argv)
sdl_gl_context = SDL_GL_CreateContext (sdl_window);
gst_init (&argc, &argv);
loop = g_main_loop_new (NULL, FALSE);
SDL_GL_MakeCurrent (sdl_window, sdl_gl_context);
@ -339,10 +361,6 @@ main (int argc, char **argv)
NULL));
bus = gst_pipeline_get_bus (GST_PIPELINE (pipeline));
gst_bus_add_signal_watch (bus);
g_signal_connect (bus, "message::error", G_CALLBACK (end_stream_cb), loop);
g_signal_connect (bus, "message::warning", G_CALLBACK (end_stream_cb), loop);
g_signal_connect (bus, "message::eos", G_CALLBACK (end_stream_cb), loop);
gst_bus_enable_sync_message_emission (bus);
g_signal_connect (bus, "sync-message", G_CALLBACK (sync_bus_call), NULL);
@ -367,12 +385,11 @@ main (int argc, char **argv)
gst_element_set_state (GST_ELEMENT (pipeline), GST_STATE_PLAYING);
g_main_loop_run (loop);
sdl_event_loop (bus);
gst_element_set_state (GST_ELEMENT (pipeline), GST_STATE_NULL);
gst_object_unref (pipeline);
gst_bus_remove_signal_watch (bus);
gst_object_unref (bus);
gst_object_unref (sdl_context);