/* GStreamer Editing Services * Copyright (C) <2013> Thibault Saunier <thibault.saunier@collabora.com> * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Library General Public License for more details. * * You should have received a copy of the GNU Library General Public * License along with this library; if not, write to the * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, * Boston, MA 02110-1301, USA. */ /** * SECTION: gesaudiotrack * @title: GESAudioTrack * @short_description: A standard #GESTrack for raw audio * * A #GESAudioTrack is a default audio #GESTrack, with a * #GES_TRACK_TYPE_AUDIO #GESTrack:track-type and "audio/x-raw(ANY)" * #GESTrack:caps. * * By default, an audio track will have its #GESTrack:restriction-caps * set to "audio/x-raw" with the following properties: * * - format: "S32LE" * - channels: 2 * - rate: 44100 * - layout: "interleaved" * * These fields are needed for negotiation purposes, but you can change * their values if you wish. It is advised that you do so using * ges_track_update_restriction_caps() with new values for the fields you * wish to change, and any additional fields you may want to add. Unlike * using ges_track_set_restriction_caps(), this will ensure that these * default fields will at least have some value set. */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include "ges-internal.h" #include "ges-smart-adder.h" #include "ges-audio-track.h" #define DEFAULT_CAPS "audio/x-raw" #if G_BYTE_ORDER == G_LITTLE_ENDIAN #define DEFAULT_RESTRICTION_CAPS "audio/x-raw, format=S32LE, channels=2, "\ "rate=44100, layout=interleaved" #else #define DEFAULT_RESTRICTION_CAPS "audio/x-raw, format=S32BE, channels=2, "\ "rate=44100, layout=interleaved" #endif struct _GESAudioTrackPrivate { gpointer nothing; }; G_DEFINE_TYPE_WITH_PRIVATE (GESAudioTrack, ges_audio_track, GES_TYPE_TRACK); /**************************************************** * Private methods and utils * ****************************************************/ static void _sync_capsfilter_with_track (GESTrack * track, GstElement * capsfilter) { GstCaps *restriction, *caps; gint rate; GstStructure *structure; g_object_get (track, "restriction-caps", &restriction, NULL); if (restriction == NULL) return; if (gst_caps_get_size (restriction) == 0) goto done; structure = gst_caps_get_structure (restriction, 0); if (!gst_structure_get_int (structure, "rate", &rate)) goto done; caps = gst_caps_new_simple ("audio/x-raw", "rate", G_TYPE_INT, rate, NULL); g_object_set (capsfilter, "caps", caps, NULL); gst_caps_unref (caps); done: gst_caps_unref (restriction); } static void _track_restriction_changed_cb (GESTrack * track, GParamSpec * arg G_GNUC_UNUSED, GstElement * capsfilter) { _sync_capsfilter_with_track (track, capsfilter); } static void _weak_notify_cb (GESTrack * track, GstElement * capsfilter) { g_signal_handlers_disconnect_by_func (track, (GCallback) _track_restriction_changed_cb, capsfilter); } static GstElement * create_element_for_raw_audio_gap (GESTrack * track) { GstElement *bin; GstElement *capsfilter; bin = gst_parse_bin_from_description ("audiotestsrc wave=silence name=src ! audioconvert ! audioresample ! audioconvert ! capsfilter name=gapfilter caps=audio/x-raw", TRUE, NULL); capsfilter = gst_bin_get_by_name (GST_BIN (bin), "gapfilter"); g_object_weak_ref (G_OBJECT (capsfilter), (GWeakNotify) _weak_notify_cb, track); g_signal_connect (track, "notify::restriction-caps", (GCallback) _track_restriction_changed_cb, capsfilter); _sync_capsfilter_with_track (track, capsfilter); gst_object_unref (capsfilter); return bin; } /**************************************************** * GObject vmethods implementations * ****************************************************/ static void ges_audio_track_init (GESAudioTrack * self) { self->priv = ges_audio_track_get_instance_private (self); } static void ges_audio_track_finalize (GObject * object) { /* TODO: Add deinitalization code here */ G_OBJECT_CLASS (ges_audio_track_parent_class)->finalize (object); } static void ges_audio_track_class_init (GESAudioTrackClass * klass) { GObjectClass *object_class = G_OBJECT_CLASS (klass); /* GESTrackClass *parent_class = GES_TRACK_CLASS (klass); */ object_class->finalize = ges_audio_track_finalize; GES_TRACK_CLASS (klass)->get_mixing_element = ges_smart_adder_new; } /**************************************************** * API implementation * ****************************************************/ /** * ges_audio_track_new: * * Creates a new audio track, with a #GES_TRACK_TYPE_AUDIO * #GESTrack:track-type, "audio/x-raw(ANY)" #GESTrack:caps, and * "audio/x-raw" #GESTrack:restriction-caps with the properties: * * - format: "S32LE" * - channels: 2 * - rate: 44100 * - layout: "interleaved" * * You should use ges_track_update_restriction_caps() if you wish to * modify these fields, or add additional ones. * * Returns: (transfer floating): The newly created audio track. */ GESAudioTrack * ges_audio_track_new (void) { GESAudioTrack *ret; GstCaps *caps = gst_caps_from_string (DEFAULT_CAPS); GstCaps *restriction_caps = gst_caps_from_string (DEFAULT_RESTRICTION_CAPS); ret = g_object_new (GES_TYPE_AUDIO_TRACK, "caps", caps, "track-type", GES_TRACK_TYPE_AUDIO, NULL); ges_track_set_create_element_for_gap_func (GES_TRACK (ret), create_element_for_raw_audio_gap); ges_track_set_restriction_caps (GES_TRACK (ret), restriction_caps); gst_caps_unref (caps); gst_caps_unref (restriction_caps); return ret; }