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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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133 lines
3 KiB
Objective-C
133 lines
3 KiB
Objective-C
#import "GStreamerBackend.h"
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#include <gst/gst.h>
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@interface GStreamerBackend()
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-(void)notifyError:(gchar*) message;
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-(void)notifyEos;
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-(void) _poll_gst_bus;
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@end
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@implementation GStreamerBackend {
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GstElement *pipeline;
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}
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@synthesize delegate;
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-(void) dealloc
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{
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if (pipeline) {
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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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-(void)notifyError:(gchar*) message
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{
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NSString *string = [NSString stringWithUTF8String:message];
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if(delegate && [delegate respondsToSelector:@selector(gstreamerError:from:)])
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{
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[delegate gstreamerError:string from:self];
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}
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}
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-(void)notifyEos
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{
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if(delegate && [delegate respondsToSelector:@selector(gstreamerEosFrom)])
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{
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[delegate gstreamerEosFrom:self];
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}
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}
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-(void) _poll_gst_bus
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{
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GstBus *bus;
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GstMessage *msg;
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/* Wait until error or EOS */
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bus = gst_element_get_bus (self->pipeline);
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msg = gst_bus_timed_pop_filtered(bus, GST_CLOCK_TIME_NONE,
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(GstMessageType) (GST_MESSAGE_ERROR | GST_MESSAGE_EOS));
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gst_object_unref(bus);
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switch (GST_MESSAGE_TYPE(msg)) {
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case GST_MESSAGE_EOS:
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[self stop];
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[self notifyEos];
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NSLog(@"EOS");
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break;
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case GST_MESSAGE_ERROR: {
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GError *gerr = NULL;
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gchar *debug;
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gst_message_parse_error(msg, &gerr, &debug);
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[self stop];
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NSLog(@"Error %s - %s", gerr->message, debug, nil);
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[self notifyError:gerr->message];
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g_free(debug);
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g_error_free(gerr);
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}
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break;
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default:
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break;
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}
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}
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-(BOOL) initializePipeline
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{
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GError *error = NULL;
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if (pipeline)
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return YES;
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pipeline = gst_parse_launch("audiotestsrc ! audioconvert ! audioresample ! autoaudiosink", &error);
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if (error) {
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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 notifyError:message];
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g_free (message);
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return NO;
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}
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/* start the bus polling. This will the bus being continuously polled */
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dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
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while (1) {
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[self _poll_gst_bus];
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}
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});
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return YES;
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}
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-(void) play
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{
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if(gst_element_set_state(pipeline, GST_STATE_PLAYING) == GST_STATE_CHANGE_FAILURE) {
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[self notifyError:"Failed to set pipeline to playing"];
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}
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}
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-(void) pause
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{
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if(gst_element_set_state(pipeline, GST_STATE_PAUSED) == GST_STATE_CHANGE_FAILURE) {
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[self notifyError:"Failed to set pipeline to paused"];
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}
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}
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-(void) stop
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{
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if(pipeline)
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gst_element_set_state(pipeline, GST_STATE_NULL);
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}
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-(NSString*) getGStreamerVersion
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{
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char *str = gst_version_string();
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NSString *version = [NSString stringWithUTF8String:str];
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g_free(str);
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return version;
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}
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@end
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