gapless.c

#include <stdio.h>
#include <gst/gst.h>

#define BUF_LEN 1000
char buf[BUF_LEN];
char *path;
char *name;
int video_segment_cnt = 1;

char *get_uri_from_id(int n);

/* Structure to contain all our information, so we can pass it around */
typedef struct _CustomData {
	GstElement *playbin;  /* Our one and only element */
	GMainLoop *main_loop;  /* GLib's Main Loop */
} CustomData;

void prepare_next_stream(GstElement *obj, gpointer userdata) {
	g_print("prepare next stream\n");
	CustomData *data = (CustomData*) userdata;
	video_segment_cnt++;
	if (video_segment_cnt < 196)
		g_object_set(G_OBJECT(data->playbin), "uri",
		get_uri_from_id(video_segment_cnt), NULL);
}

/* playbin flags */
typedef enum {
	GST_PLAY_FLAG_VIDEO         = (1 << 0), /* We want video output */
	GST_PLAY_FLAG_AUDIO         = (1 << 1), /* We want audio output */
	GST_PLAY_FLAG_TEXT          = (1 << 2)  /* We want subtitle output */
} GstPlayFlags;

char *get_uri_from_id(int n) {
	sprintf(buf, "file://%s/%s_%d.mp4", path, name, n);
	g_print("log: %s\n", buf);
	return buf;
}

/**
 * Usage: ./gapless <path of video segments> <name of video segment> 
 */
int main(int argc, char *argv[]) {
	CustomData data;
	GstStateChangeReturn ret;
	gint flags;
	GIOChannel *io_stdin;

	path = argv[1];
	name = argv[2];
	/* Initialize GStreamer */
	gst_init (&argc, &argv);

	/* Create the elements */
	data.playbin = gst_element_factory_make ("playbin", "playbin");

	if (!data.playbin) {
		g_printerr ("Not all elements could be created.\n");
		return -1;
	}

	/* Set the URI to play */
	g_object_set (data.playbin, "uri", get_uri_from_id(video_segment_cnt), NULL);

	g_signal_connect(data.playbin, "about-to-finish", G_CALLBACK(prepare_next_stream), &data);

	/* Start playing */
	ret = gst_element_set_state (data.playbin, GST_STATE_PLAYING);
	if (ret == GST_STATE_CHANGE_FAILURE) {
		g_printerr ("Unable to set the pipeline to the playing state.\n");
		gst_object_unref (data.playbin);
		return -1;
	}

	/* Create a GLib Main Loop and set it to run */
	data.main_loop = g_main_loop_new (NULL, FALSE);
	g_main_loop_run (data.main_loop);

	/* Free resources */
	g_main_loop_unref (data.main_loop);
	g_io_channel_unref (io_stdin);
	gst_element_set_state (data.playbin, GST_STATE_NULL);
	gst_object_unref (data.playbin);
	return 0;
}