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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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682db96a41
Add a signal that allows adding fragments with a specific offset and duration directly to splitmuxsrc's list. By providing the fragment's offset on the playback timeline and duration directly, splitmuxsrc doesn't need to measure the fragment making for faster startup times. Add a bus message that's published when fragments are measured, reporting the offset and duration, so they can be cached by an application and used on future invocations. Add examples for handling the bus message and using the 'add-fragment' signal. Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/7053>
139 lines
4 KiB
C
139 lines
4 KiB
C
/* GStreamer
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* Copyright (C) 2024 Jan Schmidt <jan@centricular.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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/*
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* This example uses splitmuxsrc to play a set of splitmuxed-files,
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* by reading the set of files and their playback offsets from a CSV
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* file generated by splitmuxsink-fragment-info or splitmuxsrc-extract
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* and providing them to splitmuxsrc via the `add-fragment` signal.
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*/
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <gst/gst.h>
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GMainLoop *loop;
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gchar **fragment_lines;
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static gboolean
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message_handler (GstBus * bus, GstMessage * message, gpointer data)
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{
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if (message->type == GST_MESSAGE_ERROR) {
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GError *err;
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gchar *debug_info;
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gst_message_parse_error (message, &err, &debug_info);
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g_printerr ("Error received from element %s: %s\n",
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GST_OBJECT_NAME (message->src), err->message);
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g_printerr ("Debugging information: %s\n",
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debug_info ? debug_info : "none");
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g_main_loop_quit (loop);
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}
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if (message->type == GST_MESSAGE_EOS) {
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g_main_loop_quit (loop);
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}
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return TRUE;
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}
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static void
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setup_splitmuxsrc (GstElement * playbin, GstElement * src, gpointer userdata)
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{
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/* Read fragment info from csv lines and add to splitmuxsrc */
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gsize i = 0;
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for (i = 0; fragment_lines[i] != NULL; i++) {
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gchar *fragment = fragment_lines[i];
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if (fragment[0] == '\0')
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continue;
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gchar *fname = NULL;
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GstClockTime start_offset, duration;
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const char *fmt = "\"%m[^\"]\",%" G_GUINT64_FORMAT ",%" G_GUINT64_FORMAT;
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int ret = sscanf (fragment, fmt, &fname, &start_offset, &duration);
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if (ret != 3) {
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g_printerr ("failed to parse line %" G_GSIZE_FORMAT ": %s\n", i,
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fragment);
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g_main_loop_quit (loop);
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return;
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}
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#if 0
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g_print ("Adding fragment \"%s\",%" G_GUINT64_FORMAT ",%" G_GUINT64_FORMAT
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"\n", fname, start_offset, duration);
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#endif
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gboolean add_result = FALSE;
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g_signal_emit_by_name (G_OBJECT (src), "add-fragment", fname, start_offset,
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duration, &add_result);
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if (!add_result) {
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g_printerr ("Failed to add fragment %" G_GSIZE_FORMAT ": %s\n", i, fname);
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g_main_loop_quit (loop);
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return;
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}
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free (fname);
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}
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}
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int
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main (int argc, char *argv[])
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{
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GstElement *pipe;
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GstBus *bus;
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gst_init (&argc, &argv);
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if (argc < 2) {
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g_printerr
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("Usage: %s fragments.csv\n Pass a fragment info csv (from splitmuxsrc-extract) with fragment info to load\n",
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argv[0]);
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return 1;
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}
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GError *err = NULL;
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gchar *fragment_info;
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if (!g_file_get_contents (argv[1], &fragment_info, NULL, &err)) {
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g_printerr ("Failed to open fragment info file %s. Error %s", argv[1],
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err->message);
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g_clear_error (&err);
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return 2;
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}
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fragment_lines = g_strsplit (fragment_info, "\n", 0);
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g_free (fragment_info);
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pipe = gst_element_factory_make ("playbin3", NULL);
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/* Connect to source-setup to set fragments on splitmuxsrc */
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g_signal_connect (pipe, "source-setup", G_CALLBACK (setup_splitmuxsrc), NULL);
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g_object_set (pipe, "uri", "splitmux://", NULL);
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bus = gst_element_get_bus (pipe);
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gst_bus_add_watch (bus, message_handler, NULL);
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gst_object_unref (bus);
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gst_element_set_state (pipe, GST_STATE_PLAYING);
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loop = g_main_loop_new (NULL, FALSE);
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g_main_loop_run (loop);
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gst_element_set_state (pipe, GST_STATE_NULL);
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gst_object_unref (pipe);
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return 0;
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}
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