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/* GStreamer Thunder Parser
*
* Copyright (C) 2025 Comcast Inc.
* Copyright (C) 2025 Igalia S.L.
*
* 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.
*/
#include "config.h"
#include "WebKitThunderParser.h"
#if ENABLE(ENCRYPTED_MEDIA) && ENABLE(THUNDER) && USE(GSTREAMER)
#include "CDMProxyThunder.h"
#include "GStreamerCommon.h"
#include "GStreamerEMEUtilities.h"
#include <wtf/glib/WTFGType.h>
#include <wtf/text/StringView.h>
GST_DEBUG_CATEGORY(webkitMediaThunderParserDebugCategory);
#define GST_CAT_DEFAULT webkitMediaThunderParserDebugCategory
typedef struct _WebKitMediaThunderParserPrivate {
GRefPtr<GstElement> decryptor;
GRefPtr<GstElement> parser;
} WebKitMediaThunderParserPrivate;
typedef struct _WebKitMediaThunderParser {
GstBin parent;
WebKitMediaThunderParserPrivate* priv;
} WebKitMediaThunderParser;
typedef struct _WebKitMediaThunderParserClass {
GstBinClass parentClass;
} WebKitMediaThunderParserClass;
using namespace WebCore;
WEBKIT_DEFINE_TYPE(WebKitMediaThunderParser, webkit_media_thunder_parser, GST_TYPE_BIN)
static GstStaticPadTemplate thunderParseSrcTemplate = GST_STATIC_PAD_TEMPLATE("src_%u",
GST_PAD_SRC,
GST_PAD_SOMETIMES,
GST_STATIC_CAPS(
"video/webm; "
"audio/webm; "
"video/mp4; "
"audio/mp4; "
"audio/mpeg; "
"audio/x-flac; "
"audio/x-eac3; "
"audio/x-ac3; "
"video/x-h264; "
"video/x-h265; "
"video/x-vp9; video/x-vp8; "
"video/x-av1; "
"audio/x-opus; audio/x-vorbis"));
static GRefPtr<GstCaps> createThunderParseSinkPadTemplateCaps()
{
GRefPtr<GstCaps> caps = adoptGRef(gst_caps_new_empty());
auto& supportedKeySystems = CDMFactoryThunder::singleton().supportedKeySystems();
if (supportedKeySystems.isEmpty()) {
GST_WARNING("no supported key systems in Thunder, we won't be able to decrypt anything with the decryptor");
return caps;
}
for (const auto& mediaType : GStreamerEMEUtilities::s_cencEncryptionMediaTypes) {
gst_caps_append_structure(caps.get(), gst_structure_new_empty(mediaType.characters()));
gst_caps_append_structure(caps.get(), gst_structure_new("application/x-cenc", "original-media-type", G_TYPE_STRING, mediaType.characters(), nullptr));
}
for (const auto& keySystem : supportedKeySystems) {
for (const auto& mediaType : GStreamerEMEUtilities::s_cencEncryptionMediaTypes) {
gst_caps_append_structure(caps.get(), gst_structure_new("application/x-cenc", "original-media-type", G_TYPE_STRING,
mediaType.characters(), "protection-system", G_TYPE_STRING, GStreamerEMEUtilities::keySystemToUuid(keySystem), nullptr));
}
}
if (supportedKeySystems.contains(GStreamerEMEUtilities::s_WidevineKeySystem) || supportedKeySystems.contains(GStreamerEMEUtilities::s_ClearKeyKeySystem)) {
for (const auto& mediaType : GStreamerEMEUtilities::s_webmEncryptionMediaTypes) {
gst_caps_append_structure(caps.get(), gst_structure_new_empty(mediaType.characters()));
gst_caps_append_structure(caps.get(), gst_structure_new("application/x-webm-enc", "original-media-type", G_TYPE_STRING, mediaType.characters(), nullptr));
}
}
return caps;
}
static void webkitMediaThunderParserConstructed(GObject* object)
{
G_OBJECT_CLASS(webkit_media_thunder_parser_parent_class)->constructed(object);
auto self = WEBKIT_MEDIA_THUNDER_PARSER(object);
self->priv->parser = makeGStreamerElement("parsebin"_s, "inner-parser"_s);
auto factories = gst_element_factory_list_get_elements(GST_ELEMENT_FACTORY_TYPE_DECRYPTOR, GST_RANK_MARGINAL);
factories = g_list_sort(factories, gst_plugin_feature_rank_compare_func);
for (GList* tmp = factories; tmp; tmp = tmp->next) {
auto factory = GST_ELEMENT_FACTORY_CAST(tmp->data);
self->priv->decryptor = gst_element_factory_create(factory, nullptr);
if (self->priv->decryptor) {
GST_DEBUG_OBJECT(self, "Using decryptor %" GST_PTR_FORMAT, self->priv->decryptor.get());
break;
}
}
gst_plugin_feature_list_free(factories);
if (!self->priv->decryptor) [[unlikely]] {
GST_DEBUG_OBJECT(self, "Unable to find any decryptor, encrypted buffers will be passed-through");
self->priv->decryptor = gst_element_factory_make("identity", nullptr);
}
gst_bin_add_many(GST_BIN_CAST(self), self->priv->decryptor.get(), self->priv->parser.get(), nullptr);
gst_element_link(self->priv->decryptor.get(), self->priv->parser.get());
g_signal_connect(self->priv->parser.get(), "autoplug-factories", G_CALLBACK(+[](GstElement*, GstPad*, GstCaps* caps, gpointer userData) -> GValueArray* {
auto self = WEBKIT_MEDIA_THUNDER_PARSER(userData);
ALLOW_DEPRECATED_DECLARATIONS_BEGIN;
GValueArray* result;
auto factories = gst_element_factory_list_get_elements(GST_ELEMENT_FACTORY_TYPE_DECODABLE, GST_RANK_MARGINAL);
auto list = gst_element_factory_list_filter(factories, caps, GST_PAD_SINK, gst_caps_is_fixed(caps));
result = g_value_array_new(g_list_length(list));
for (GList* tmp = list; tmp; tmp = tmp->next) {
auto factory = GST_ELEMENT_FACTORY_CAST(tmp->data);
auto name = StringView::fromLatin1(gst_plugin_feature_get_name(GST_PLUGIN_FEATURE_CAST(factory)));
if (name == "webkitthunderparser"_s)
continue;
auto decryptorFactoryName = StringView::fromLatin1(gst_plugin_feature_get_name(GST_PLUGIN_FEATURE_CAST(gst_element_get_factory(self->priv->decryptor.get()))));
if (name == decryptorFactoryName)
continue;
GValue value = G_VALUE_INIT;
g_value_init(&value, G_TYPE_OBJECT);
g_value_set_object(&value, factory);
g_value_array_append(result, &value);
g_value_unset(&value);
}
gst_plugin_feature_list_free(list);
gst_plugin_feature_list_free(factories);
return result;
ALLOW_DEPRECATED_DECLARATIONS_END;
}), self);
g_signal_connect(self->priv->parser.get(), "pad-added", G_CALLBACK(+[](GstElement*, GstPad* pad, gpointer userData) {
static unsigned counter = 0;
auto name = makeString("src_"_s, counter);
counter++;
gst_element_add_pad(GST_ELEMENT_CAST(userData), gst_ghost_pad_new(name.ascii().data(), pad));
}), self);
auto decryptorSinkPad = adoptGRef(gst_element_get_static_pad(self->priv->decryptor.get(), "sink"));
gst_element_add_pad(GST_ELEMENT_CAST(self), gst_ghost_pad_new("sink", decryptorSinkPad.get()));
gst_bin_sync_children_states(GST_BIN_CAST(self));
}
static void webkit_media_thunder_parser_class_init(WebKitMediaThunderParserClass* klass)
{
GST_DEBUG_CATEGORY_INIT(webkitMediaThunderParserDebugCategory, "webkitthunderparser", 0, "Thunder parser");
auto objectClass = G_OBJECT_CLASS(klass);
objectClass->constructed = webkitMediaThunderParserConstructed;
auto elementClass = GST_ELEMENT_CLASS(klass);
auto padTemplateCaps = createThunderParseSinkPadTemplateCaps();
gst_element_class_add_pad_template(elementClass, gst_pad_template_new("sink", GST_PAD_SINK, GST_PAD_ALWAYS, padTemplateCaps.get()));
gst_element_class_add_pad_template(elementClass, gst_static_pad_template_get(&thunderParseSrcTemplate));
gst_element_class_set_static_metadata(elementClass, "Parse potentially encrypted content", "Codec/Parser/Audio/Video",
"Parse potentially encrypted content", "Philippe Normand <philn@igalia.com>");
}
#undef GST_CAT_DEFAULT
#endif // ENABLE(ENCRYPTED_MEDIA) && ENABLE(THUNDER) && USE(GSTREAMER)
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