mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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479 lines
12 KiB
Objective-C
479 lines
12 KiB
Objective-C
/* GStreamer
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* Copyright (C) 2013 Fluendo S.L. <support@fluendo.com>
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* Authors: 2013 Andoni Morales Alastruey <amorales@fluendo.com>
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* Copyright (C) 2013 Sebastian Dröge <slomo@circular-chaos.org>
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*
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* gstios_assetsrc.c:
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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., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/**
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* SECTION:element-ios_assetsrc
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* @see_also: #GstIOSAssetSrc
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*
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* Read data from an iOS asset from the media library.
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*
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* ## Example launch line
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*
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* |[
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* gst-launch-1.0 iosassetsrc uri=assets-library://asset/asset.M4V?id=11&ext=M4V ! decodebin ! autoaudiosink
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* ]| Plays asset with id a song.ogg from local dir.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <gst/gst.h>
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#include <gst/base/base.h>
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#include "iosassetsrc.h"
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static GstStaticPadTemplate srctemplate = GST_STATIC_PAD_TEMPLATE ("src",
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GST_PAD_SRC,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS_ANY);
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GST_DEBUG_CATEGORY_STATIC (gst_ios_asset_src_debug);
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#define GST_CAT_DEFAULT gst_ios_asset_src_debug
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#define DEFAULT_BLOCKSIZE 4*1024
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enum
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{
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PROP_0,
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PROP_URI,
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};
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static void gst_ios_asset_src_finalize (GObject * object);
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static void gst_ios_asset_src_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec);
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static void gst_ios_asset_src_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec);
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static gboolean gst_ios_asset_src_start (GstBaseSrc * basesrc);
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static gboolean gst_ios_asset_src_stop (GstBaseSrc * basesrc);
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static gboolean gst_ios_asset_src_is_seekable (GstBaseSrc * src);
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static gboolean gst_ios_asset_src_get_size (GstBaseSrc * src, guint64 * size);
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static GstFlowReturn gst_ios_asset_src_create (GstBaseSrc * src, guint64 offset,
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guint length, GstBuffer ** buffer);
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static gboolean gst_ios_asset_src_query (GstBaseSrc * src, GstQuery * query);
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static void gst_ios_asset_src_uri_handler_init (gpointer g_iface,
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gpointer iface_data);
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static void
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_do_init (GType ios_assetsrc_type)
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{
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static const GInterfaceInfo urihandler_info = {
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gst_ios_asset_src_uri_handler_init,
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NULL,
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NULL
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};
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g_type_add_interface_static (ios_assetsrc_type, GST_TYPE_URI_HANDLER,
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&urihandler_info);
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GST_DEBUG_CATEGORY_INIT (gst_ios_asset_src_debug, "iosassetsrc", 0, "iosassetsrc element");
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}
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G_DEFINE_TYPE_WITH_CODE (GstIOSAssetSrc, gst_ios_asset_src, GST_TYPE_BASE_SRC,
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_do_init (g_define_type_id));
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static void
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gst_ios_asset_src_class_init (GstIOSAssetSrcClass * klass)
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{
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GObjectClass *gobject_class;
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GstElementClass *gstelement_class;
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GstBaseSrcClass *gstbasesrc_class;
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gobject_class = G_OBJECT_CLASS (klass);
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gstelement_class = GST_ELEMENT_CLASS (klass);
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gstbasesrc_class = GST_BASE_SRC_CLASS (klass);
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gobject_class->set_property = gst_ios_asset_src_set_property;
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gobject_class->get_property = gst_ios_asset_src_get_property;
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g_object_class_install_property (gobject_class, PROP_URI,
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g_param_spec_string ("uri", "Asset URI",
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"URI of the asset to read", NULL,
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G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS |
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GST_PARAM_MUTABLE_READY));
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gobject_class->finalize = gst_ios_asset_src_finalize;
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gst_element_class_set_static_metadata (gstelement_class,
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"IOSAsset Source",
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"Source/File",
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"Read from arbitrary point in a iOS asset",
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"Andoni Morales Alastruey <amorales@fluendo.com>");
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gst_element_class_add_static_pad_template (gstelement_class, &srctemplate);
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gstbasesrc_class->start = GST_DEBUG_FUNCPTR (gst_ios_asset_src_start);
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gstbasesrc_class->stop = GST_DEBUG_FUNCPTR (gst_ios_asset_src_stop);
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gstbasesrc_class->is_seekable = GST_DEBUG_FUNCPTR (gst_ios_asset_src_is_seekable);
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gstbasesrc_class->get_size = GST_DEBUG_FUNCPTR (gst_ios_asset_src_get_size);
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gstbasesrc_class->create = GST_DEBUG_FUNCPTR (gst_ios_asset_src_create);
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gstbasesrc_class->query = GST_DEBUG_FUNCPTR (gst_ios_asset_src_query);
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}
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static void
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gst_ios_asset_src_init (GstIOSAssetSrc * src)
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{
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src->uri = NULL;
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src->asset = NULL;
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src->library = (__bridge_retained gpointer)[[GstAssetsLibrary alloc] init];
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gst_base_src_set_blocksize (GST_BASE_SRC (src), DEFAULT_BLOCKSIZE);
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}
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static void
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gst_ios_asset_src_free_resources (GstIOSAssetSrc *src)
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{
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if (src->asset != NULL) {
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CFBridgingRelease(src->asset);
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src->asset = NULL;
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}
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if (src->url != NULL) {
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CFBridgingRelease(src->url);
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src->url = NULL;
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}
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if (src->uri != NULL) {
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g_free (src->uri);
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src->uri = NULL;
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}
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}
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static void
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gst_ios_asset_src_finalize (GObject * object)
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{
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GstIOSAssetSrc *src;
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src = GST_IOS_ASSET_SRC (object);
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gst_ios_asset_src_free_resources (src);
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CFBridgingRelease(src->library);
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G_OBJECT_CLASS (gst_ios_asset_src_parent_class)->finalize (object);
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}
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static gboolean
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gst_ios_asset_src_set_uri (GstIOSAssetSrc * src, const gchar * uri, GError **err)
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{
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GstState state;
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NSString *nsuristr;
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NSURL *url;
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/* the element must be stopped in order to do this */
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GST_OBJECT_LOCK (src);
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state = GST_STATE (src);
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if (state != GST_STATE_READY && state != GST_STATE_NULL)
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goto wrong_state;
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GST_OBJECT_UNLOCK (src);
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gst_ios_asset_src_free_resources (src);
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nsuristr = [[NSString alloc] initWithUTF8String:uri];
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url = [[NSURL alloc] initWithString:nsuristr];
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if (url == NULL) {
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GST_ERROR_OBJECT (src, "Invalid URI: %s", uri);
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g_set_error (err, GST_URI_ERROR, GST_URI_ERROR_BAD_URI,
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"Invalid URI: %s", uri);
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return FALSE;
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}
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GST_INFO_OBJECT (src, "URI : %s", src->uri);
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src->url = (__bridge_retained gpointer)url;
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src->uri = g_strdup (uri);
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g_object_notify (G_OBJECT (src), "uri");
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return TRUE;
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/* ERROR */
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wrong_state:
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{
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g_warning ("Changing the 'uri' property on iosassetsrc when an asset is "
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"open is not supported.");
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g_set_error (err, GST_URI_ERROR, GST_URI_ERROR_BAD_STATE,
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"Changing the 'uri' property on iosassetsrc when an asset is "
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"open is not supported.");
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GST_OBJECT_UNLOCK (src);
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return FALSE;
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}
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}
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static void
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gst_ios_asset_src_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec)
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{
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GstIOSAssetSrc *src;
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g_return_if_fail (GST_IS_IOS_ASSET_SRC (object));
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src = GST_IOS_ASSET_SRC (object);
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switch (prop_id) {
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case PROP_URI:
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gst_ios_asset_src_set_uri (src, g_value_get_string (value), NULL);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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gst_ios_asset_src_get_property (GObject * object, guint prop_id, GValue * value,
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GParamSpec * pspec)
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{
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GstIOSAssetSrc *src;
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g_return_if_fail (GST_IS_IOS_ASSET_SRC (object));
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src = GST_IOS_ASSET_SRC (object);
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switch (prop_id) {
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case PROP_URI:
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g_value_set_string (value, src->uri);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static GstFlowReturn
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gst_ios_asset_src_create (GstBaseSrc * basesrc, guint64 offset, guint length,
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GstBuffer ** buffer)
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{
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GstBuffer *buf = NULL;
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GstMapInfo info;
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NSError *err = nil;
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guint bytes_read;
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GstFlowReturn ret;
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GstIOSAssetSrc *src = GST_IOS_ASSET_SRC (basesrc);
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buf = gst_buffer_new_and_alloc (length);
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if (G_UNLIKELY (buf == NULL && length > 0)) {
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GST_ERROR_OBJECT (src, "Failed to allocate %u bytes", length);
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ret = GST_FLOW_ERROR;
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goto exit;
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}
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gst_buffer_map (buf, &info, GST_MAP_READWRITE);
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/* No need to read anything if length is 0 */
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bytes_read = [GST_IOS_ASSET_SRC_ASSET(src) getBytes: info.data
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fromOffset:offset
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length:length
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error:&err];
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if (G_UNLIKELY (err != NULL)) {
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goto could_not_read;
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}
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/* we should eos if we read less than what was requested */
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if (G_UNLIKELY (bytes_read < length)) {
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GST_DEBUG ("EOS");
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ret = GST_FLOW_EOS;
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} else {
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ret = GST_FLOW_OK;
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}
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gst_buffer_unmap (buf, &info);
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gst_buffer_set_size (buf, bytes_read);
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GST_BUFFER_OFFSET (buf) = offset;
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GST_BUFFER_OFFSET_END (buf) = offset + bytes_read;
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*buffer = buf;
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goto exit;
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/* ERROR */
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could_not_read:
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{
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GST_ELEMENT_ERROR (src, RESOURCE, READ, (NULL), GST_ERROR_SYSTEM);
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gst_buffer_unmap (buf, &info);
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gst_buffer_unref (buf);
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ret = GST_FLOW_ERROR;
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goto exit;
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}
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exit:
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{
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return ret;
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}
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}
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static gboolean
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gst_ios_asset_src_query (GstBaseSrc * basesrc, GstQuery * query)
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{
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gboolean ret = FALSE;
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GstIOSAssetSrc *src = GST_IOS_ASSET_SRC (basesrc);
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switch (GST_QUERY_TYPE (query)) {
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case GST_QUERY_URI:
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gst_query_set_uri (query, src->uri);
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ret = TRUE;
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break;
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default:
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ret = FALSE;
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break;
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}
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if (!ret)
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ret = GST_BASE_SRC_CLASS (gst_ios_asset_src_parent_class)->query (basesrc, query);
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return ret;
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}
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static gboolean
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gst_ios_asset_src_is_seekable (GstBaseSrc * basesrc)
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{
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return TRUE;
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}
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static gboolean
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gst_ios_asset_src_get_size (GstBaseSrc * basesrc, guint64 * size)
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{
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GstIOSAssetSrc *src;
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src = GST_IOS_ASSET_SRC (basesrc);
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*size = (guint64) [GST_IOS_ASSET_SRC_ASSET(src) size];
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return TRUE;
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}
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static gboolean
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gst_ios_asset_src_start (GstBaseSrc * basesrc)
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{
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GstIOSAssetSrc *src = GST_IOS_ASSET_SRC (basesrc);
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gboolean ret = TRUE;
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src->asset = (__bridge_retained gpointer)[GST_IOS_ASSET_SRC_LIBRARY(src) assetForURLSync: GST_IOS_ASSET_SRC_URL(src)];
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if (src->asset == NULL) {
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GST_ELEMENT_ERROR (src, RESOURCE, OPEN_READ,
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("Could not open asset \"%s\" for reading.", src->uri),
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GST_ERROR_SYSTEM);
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ret = FALSE;
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};
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return ret;
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}
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/* unmap and close the ios_asset */
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static gboolean
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gst_ios_asset_src_stop (GstBaseSrc * basesrc)
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{
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GstIOSAssetSrc *src = GST_IOS_ASSET_SRC (basesrc);
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CFBridgingRelease(src->asset);
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return TRUE;
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}
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static GstURIType
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gst_ios_asset_src_uri_get_type (GType type)
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{
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return GST_URI_SRC;
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}
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static const gchar * const *
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gst_ios_asset_src_uri_get_protocols (GType type)
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{
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static const gchar * const protocols[] = { "assets-library", NULL };
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return protocols;
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}
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static gchar *
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gst_ios_asset_src_uri_get_uri (GstURIHandler * handler)
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{
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GstIOSAssetSrc *src = GST_IOS_ASSET_SRC (handler);
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return g_strdup (src->uri);
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}
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static gboolean
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gst_ios_asset_src_uri_set_uri (GstURIHandler * handler, const gchar * uri, GError **err)
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{
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GstIOSAssetSrc *src = GST_IOS_ASSET_SRC (handler);
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if (! g_str_has_prefix (uri, "assets-library://")) {
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GST_WARNING_OBJECT (src, "Invalid URI '%s' for ios_assetsrc", uri);
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g_set_error (err, GST_URI_ERROR, GST_URI_ERROR_BAD_URI,
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"Invalid URI '%s' for ios_assetsrc", uri);
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return FALSE;
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}
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return gst_ios_asset_src_set_uri (src, uri, err);
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}
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static void
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gst_ios_asset_src_uri_handler_init (gpointer g_iface, gpointer iface_data)
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{
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GstURIHandlerInterface *iface = (GstURIHandlerInterface *) g_iface;
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iface->get_type = gst_ios_asset_src_uri_get_type;
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iface->get_protocols = gst_ios_asset_src_uri_get_protocols;
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iface->get_uri = gst_ios_asset_src_uri_get_uri;
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iface->set_uri = gst_ios_asset_src_uri_set_uri;
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}
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@implementation GstAssetsLibrary
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@synthesize asset;
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@synthesize result;
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- (id) init
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{
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self = [super init];
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return self;
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}
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- (ALAssetRepresentation *) assetForURLSync:(NSURL*) uri
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{
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dispatch_semaphore_t sema = dispatch_semaphore_create(0);
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dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT,0);
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dispatch_async(queue, ^{
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[self assetForURL:uri resultBlock:
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^(ALAsset *myasset)
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{
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self.asset = myasset;
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self.result = [myasset defaultRepresentation];
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dispatch_semaphore_signal(sema);
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}
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failureBlock:
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^(NSError *myerror)
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{
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self.result = nil;
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dispatch_semaphore_signal(sema);
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}
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];
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});
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dispatch_semaphore_wait(sema, DISPATCH_TIME_FOREVER);
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return self.result;
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}
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@end
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