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/*
* Copyright (C) 2021 Igalia S.L
* Copyright (C) 2021 Metrological Group B.V.
*
* 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
* aint with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "config.h"
#include "GStreamerEMEUtilities.h"
#include <wtf/StdLibExtras.h>
#include <wtf/glib/GSpanExtras.h>
#include <wtf/text/Base64.h>
#if ENABLE(ENCRYPTED_MEDIA) && USE(GSTREAMER)
GST_DEBUG_CATEGORY_EXTERN(webkit_media_common_encryption_decrypt_debug_category);
#define GST_CAT_DEFAULT webkit_media_common_encryption_decrypt_debug_category
namespace WebCore {
ProtectionSystemEvents::ProtectionSystemEvents(GstMessage* message)
{
const GstStructure* structure = gst_message_get_structure(message);
const GValue* streamEncryptionEventsList = gst_structure_get_value(structure, "stream-encryption-events");
ASSERT(streamEncryptionEventsList && GST_VALUE_HOLDS_LIST(streamEncryptionEventsList));
unsigned numEvents = gst_value_list_get_size(streamEncryptionEventsList);
m_events.reserveInitialCapacity(numEvents);
for (unsigned i = 0; i < numEvents; ++i)
m_events.append(GRefPtr<GstEvent>(GST_EVENT_CAST(g_value_get_boxed(gst_value_list_get_value(streamEncryptionEventsList, i)))));
const GValue* streamEncryptionAllowedSystemsValue = gst_structure_get_value(structure, "available-stream-encryption-systems");
auto systemsArray = g_value_get_boxed(streamEncryptionAllowedSystemsValue);
if (!systemsArray)
return;
for (const auto system : span(static_cast<char**>(systemsArray)))
m_availableSystems.append(String::fromLatin1(system));
}
struct GMarkupParseContextUserData {
bool isParsingPssh { false };
RefPtr<SharedBuffer> pssh;
};
static void markupStartElement(GMarkupParseContext*, const gchar* elementName, const gchar**, const gchar**, gpointer userDataPtr, GError**)
{
GMarkupParseContextUserData* userData = static_cast<GMarkupParseContextUserData*>(userDataPtr);
auto nameView = StringView::fromLatin1(elementName);
if (nameView.endsWith("pssh"_s))
userData->isParsingPssh = true;
}
static void markupEndElement(GMarkupParseContext*, const gchar* elementName, gpointer userDataPtr, GError**)
{
GMarkupParseContextUserData* userData = static_cast<GMarkupParseContextUserData*>(userDataPtr);
auto nameView = StringView::fromLatin1(elementName);
if (nameView.endsWith("pssh"_s)) {
ASSERT(userData->isParsingPssh);
userData->isParsingPssh = false;
}
}
static void markupText(GMarkupParseContext*, const gchar* text, gsize textLength, gpointer userDataPtr, GError**)
{
GMarkupParseContextUserData* userData = static_cast<GMarkupParseContextUserData*>(userDataPtr);
if (userData->isParsingPssh) {
auto data = unsafeMakeSpan(reinterpret_cast<const uint8_t*>(text), textLength);
auto pssh = base64Decode(data);
if (pssh.has_value())
userData->pssh = SharedBuffer::create(WTFMove(*pssh));
}
}
static void markupPassthrough(GMarkupParseContext*, const gchar*, gsize, gpointer, GError**)
{
}
static void markupError(GMarkupParseContext*, GError*, gpointer)
{
}
static GMarkupParser markupParser { markupStartElement, markupEndElement, markupText, markupPassthrough, markupError };
RefPtr<SharedBuffer> InitData::extractCencIfNeeded(RefPtr<SharedBuffer>&& unparsedPayload)
{
RefPtr<SharedBuffer> payload = WTFMove(unparsedPayload);
if (!payload || !payload->size())
return payload;
GMarkupParseContextUserData userData;
GUniquePtr<GMarkupParseContext> markupParseContext(g_markup_parse_context_new(&markupParser, (GMarkupParseFlags) 0, &userData, nullptr));
auto payloadData = spanReinterpretCast<const char>(payload->span());
if (g_markup_parse_context_parse(markupParseContext.get(), payloadData.data(), payloadData.size(), nullptr)) {
if (userData.pssh)
payload = WTFMove(userData.pssh);
else
GST_WARNING("XML was parsed but we could not find a viable base64 encoded pssh box");
}
return payload;
}
#undef GST_CAT_DEFAULT
} // namespace WebCore
#endif // ENABLE(ENCRYPTED_MEDIA) && USE(GSTREAMER)
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