mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-11-10 11:29:55 +00:00
112 lines
3.3 KiB
C
112 lines
3.3 KiB
C
#include <string.h>
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#include <gst/gst.h>
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typedef struct _CustomData {
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GstElement *pipeline;
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GMainLoop *loop;
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gboolean playing; /* Playing or Paused */
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gdouble rate; /* Current playback rate */
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gboolean backward; /* Forward or backwards */
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} CustomData;
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/* Process keyboard input */
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static gboolean handle_keyboard (GIOChannel *source, GIOCondition cond, CustomData *data) {
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gchar *str = NULL;
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if (g_io_channel_read_line (source, &str, NULL, NULL, NULL) != G_IO_STATUS_NORMAL) {
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return TRUE;
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}
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switch (g_ascii_tolower (str[0])) {
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case 'p':
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data->playing = !data->playing;
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gst_element_set_state (data->pipeline, data->playing ? GST_STATE_PLAYING : GST_STATE_PAUSED);
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g_print ("Setting state to %s\n", data->playing ? "PLAYING" : "PAUSE");
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break;
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case 's':
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if (g_ascii_isupper (str[0])) {
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data->rate *= 2.0;
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} else {
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data->rate /= 2.0;
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}
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gst_element_send_event (data->pipeline,
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gst_event_new_step (GST_FORMAT_TIME, -1, data->rate, TRUE, FALSE));
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g_print ("Current rate: %g\n", data->rate);
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break;
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case 'd':
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data->backward = !data->backward;
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gst_element_send_event (data->pipeline,
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gst_event_new_seek (data->backward ? -data->rate : data->rate,
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GST_FORMAT_TIME, GST_SEEK_FLAG_NONE, GST_SEEK_TYPE_NONE, 0, GST_SEEK_TYPE_NONE, 0));
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g_print ("Going %s\n", data->backward ? "backwards" : "forward");
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break;
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case 'n':
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gst_element_send_event (data->pipeline,
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gst_event_new_step (GST_FORMAT_BUFFERS, 1, data->rate, TRUE, FALSE));
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g_print ("Stepping one frame\n");
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break;
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case 'q':
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g_main_loop_quit (data->loop);
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break;
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default:
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break;
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}
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g_free (str);
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return TRUE;
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}
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int main(int argc, char *argv[]) {
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CustomData data;
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GstStateChangeReturn ret;
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GIOChannel *io_stdin;
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/* Initialize GStreamer */
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gst_init (&argc, &argv);
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/* Initialize our data structure */
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memset (&data, 0, sizeof (data));
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/* Print usage map */
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g_print (
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"USAGE: Choose one of the following options, then press enter:\n"
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" 'P' to toggle between PAUSE and PLAY\n"
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" 'S' to increase playback speed, 's' to decrease playback speed\n"
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" 'D' to toggle playback direction\n"
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" 'N' to move to next frame (in the current direction, better in PAUSE)\n"
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" 'Q' to quit\n");
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/* Build the pipeline */
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data.pipeline = gst_parse_launch ("playbin2 uri=http://docs.gstreamer.com/media/sintel_trailer-480p.webm", NULL);
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/* Add a keyboard watch so we get notified of keystrokes */
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#ifdef _WIN32
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io_stdin = g_io_channel_win32_new_fd (fileno (stdin));
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#else
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io_stdin = g_io_channel_unix_new (fileno (stdin));
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#endif
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g_io_add_watch (io_stdin, G_IO_IN, (GIOFunc)handle_keyboard, &data);
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/* Start playing */
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ret = gst_element_set_state (data.pipeline, GST_STATE_PLAYING);
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if (ret == GST_STATE_CHANGE_FAILURE) {
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g_printerr ("Unable to set the pipeline to the playing state.\n");
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gst_object_unref (data.pipeline);
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return -1;
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}
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data.playing = TRUE;
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data.rate = 1.0;
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/* Create a GLib Main Loop and set it to run */
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data.loop = g_main_loop_new (NULL, FALSE);
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g_main_loop_run (data.loop);
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/* Free resources */
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g_main_loop_unref (data.loop);
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g_io_channel_unref (io_stdin);
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gst_element_set_state (data.pipeline, GST_STATE_NULL);
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gst_object_unref (data.pipeline);
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return 0;
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}
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