support flutter gstreamer player for iOS
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hpdragon
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#import "GStreamerBackend.h"
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#include <gst/gst.h>
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#include <gst/video/video.h>
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GST_DEBUG_CATEGORY_STATIC (debug_category);
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#define GST_CAT_DEFAULT debug_category
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@interface GStreamerBackend()
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-(void)setUIMessage:(gchar*) message;
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-(void)app_function:(gchar*) pipeline_string;
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-(void)check_initialization_complete;
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@end
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@implementation GStreamerBackend {
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/* id ui_delegate; /1* Class that we use to interact with the user interface *1/ */
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GstElement *pipeline; /* The running pipeline */
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GstElement *video_sink;/* The video sink element which receives XOverlay commands */
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GMainContext *context; /* GLib context used to run the main loop */
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GMainLoop *main_loop; /* GLib main loop */
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gboolean initialized; /* To avoid informing the UI multiple times about the initialization */
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UIView *ui_video_view; /* UIView that holds the video */
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}
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-(id) init:(NSString*) pipeline videoView:(UIView*) video_view
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{
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if (self = [super init])
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{
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/* self->ui_delegate = uiDelegate; */
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self->ui_video_view = video_view;
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GST_DEBUG_CATEGORY_INIT (debug_category, "tutorial-3", 0, "iOS tutorial 3");
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gst_debug_set_threshold_for_name("tutorial-3", GST_LEVEL_DEBUG);
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/* Start the bus monitoring task */
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dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
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[self app_function: (gchar*)[pipeline UTF8String]];
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});
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}
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return self;
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}
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-(void) dealloc
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{
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if (pipeline) {
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NSLog(@"Setting the pipeline to NULL");
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gst_element_set_state(pipeline, GST_STATE_NULL);
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gst_object_unref(pipeline);
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pipeline = NULL;
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}
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}
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/*
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* Private methods
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*/
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/* Change the message on the UI through the UI delegate */
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-(void)setUIMessage:(gchar*) message
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{
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NSString *string = [NSString stringWithUTF8String:message];
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/* if(ui_delegate && [ui_delegate respondsToSelector:@selector(gstreamerSetUIMessage:)]) */
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/* { */
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/* [ui_delegate gstreamerSetUIMessage:string]; */
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/* } */
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}
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/* Retrieve errors from the bus and show them on the UI */
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static void error_cb (GstBus *bus, GstMessage *msg, GStreamerBackend *self)
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{
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GError *err;
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gchar *debug_info;
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gchar *message_string;
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gst_message_parse_error (msg, &err, &debug_info);
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message_string = g_strdup_printf ("Error received from element %s: %s", GST_OBJECT_NAME (msg->src), err->message);
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g_clear_error (&err);
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g_free (debug_info);
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[self setUIMessage:message_string];
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g_free (message_string);
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gst_element_set_state (self->pipeline, GST_STATE_NULL);
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}
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/* Notify UI about pipeline state changes */
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static void state_changed_cb (GstBus *bus, GstMessage *msg, GStreamerBackend *self)
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{
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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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/* Only pay attention to messages coming from the pipeline, not its children */
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if (GST_MESSAGE_SRC (msg) == GST_OBJECT (self->pipeline)) {
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gchar *message = g_strdup_printf("State changed to %s", gst_element_state_get_name(new_state));
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[self setUIMessage:message];
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g_free (message);
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}
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}
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/* Check if all conditions are met to report GStreamer as initialized.
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* These conditions will change depending on the application */
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-(void) check_initialization_complete
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{
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if (!initialized && main_loop) {
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NSLog (@"Initialization complete, notifying application.");
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/* if (ui_delegate && [ui_delegate respondsToSelector:@selector(gstreamerInitialized)]) */
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/* { */
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/* [ui_delegate gstreamerInitialized]; */
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/* } */
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initialized = TRUE;
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NSLog(@"Initialization complete, notifying application.");
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if(gst_element_set_state(pipeline, GST_STATE_PLAYING) == GST_STATE_CHANGE_FAILURE) {
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[self setUIMessage:"Failed to set pipeline to playing"];
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}
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}
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}
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/* Main method for the bus monitoring code */
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-(void) app_function:(gchar*) pipeline_string
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{
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GstBus *bus;
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GSource *bus_source;
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GError *error = NULL;
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NSLog (@"Creating pipeline");
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/* Create our own GLib Main Context and make it the default one */
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context = g_main_context_new ();
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g_main_context_push_thread_default(context);
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/* Build pipeline */
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/* pipeline = gst_parse_launch("videotestsrc ! warptv ! videoconvert ! autovideosink", &error); */
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/* pipeline = gst_parse_launch("rtspsrc location= \ */
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/* rtsp://wowzaec2demo.streamlock.net/vod/mp4:BigBuckBunny_115k.mp4 latency=0 ! \ */
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/* decodebin ! \ */
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/* autovideosink", &error); */
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NSLog(@"Pipeline 1: %s", pipeline_string);
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NSLog(@"Pipeline 2: %s", pipeline_string);
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pipeline = gst_parse_launch(pipeline_string, &error);
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if (error) {
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NSLog (@"Unable to build pipeline: %s", error->message);
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gchar *message = g_strdup_printf("Unable to build pipeline: %s", error->message);
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g_clear_error (&error);
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[self setUIMessage:message];
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g_free (message);
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return;
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}
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/* Set the pipeline to READY, so it can already accept a window handle */
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gst_element_set_state(pipeline, GST_STATE_READY);
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video_sink = gst_bin_get_by_interface(GST_BIN(pipeline), GST_TYPE_VIDEO_OVERLAY);
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if (!video_sink) {
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NSLog (@"Could not retrieve video sink");
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return;
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}
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gst_video_overlay_set_window_handle(GST_VIDEO_OVERLAY(video_sink), (guintptr) (id) ui_video_view);
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/* Instruct the bus to emit signals for each received message, and connect to the interesting signals */
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bus = gst_element_get_bus (pipeline);
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bus_source = gst_bus_create_watch (bus);
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g_source_set_callback (bus_source, (GSourceFunc) gst_bus_async_signal_func, NULL, NULL);
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g_source_attach (bus_source, context);
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g_source_unref (bus_source);
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g_signal_connect (G_OBJECT (bus), "message::error", (GCallback)error_cb, (__bridge void *)self);
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g_signal_connect (G_OBJECT (bus), "message::state-changed", (GCallback)state_changed_cb, (__bridge void *)self);
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gst_object_unref (bus);
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/* Create a GLib Main Loop and set it to run */
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NSLog (@"Entering main loop...");
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main_loop = g_main_loop_new (context, FALSE);
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[self check_initialization_complete];
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g_main_loop_run (main_loop);
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NSLog (@"Exited main loop");
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g_main_loop_unref (main_loop);
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main_loop = NULL;
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/* Free resources */
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g_main_context_pop_thread_default(context);
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g_main_context_unref (context);
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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;
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}
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@end
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