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/*
* Copyright (C) 2020 Metrological Group B.V.
* Copyright (C) 2020 Igalia S.L. All rights reserved.
*
* 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"
#if ENABLE(VIDEO) && ENABLE(MEDIA_STREAM) && USE(LIBWEBRTC) && USE(GSTREAMER)
#include "GStreamerVideoCommon.h"
#include "absl/types/optional.h"
#include "webrtc/api/video_codecs/h264_profile_level_id.h"
#include "webrtc/media/base/codec.h"
namespace WebCore {
static webrtc::SdpVideoFormat createH264Format(webrtc::H264Profile profile, webrtc::H264Level level, const std::string& packetizationMode)
{
const auto profileString = webrtc::H264ProfileLevelIdToString(webrtc::H264ProfileLevelId(profile, level));
return webrtc::SdpVideoFormat(cricket::kH264CodecName,
{ { cricket::kH264FmtpProfileLevelId, *profileString },
{ cricket::kH264FmtpLevelAsymmetryAllowed, "1" },
{ cricket::kH264FmtpPacketizationMode, packetizationMode } });
}
std::vector<webrtc::SdpVideoFormat> supportedH264Formats()
{
// @TODO Create from encoder src pad caps template
//
// We only support encoding Constrained Baseline Profile (CBP), but the decoder supports more
// profiles. We can list all profiles here that are supported by the decoder and that are also
// supersets of CBP, i.e. the decoder for that profile is required to be able to decode
// CBP. This means we can encode and send CBP even though we negotiated a potentially higher
// profile. See the H264 spec for more information.
//
// We support both packetization modes 0 (mandatory) and 1 (optional, preferred).
return {
createH264Format(webrtc::H264Profile::kProfileBaseline, webrtc::H264Level::kLevel3_1, "1"),
createH264Format(webrtc::H264Profile::kProfileBaseline, webrtc::H264Level::kLevel3_1, "0"),
createH264Format(webrtc::H264Profile::kProfileConstrainedBaseline, webrtc::H264Level::kLevel3_1, "1"),
createH264Format(webrtc::H264Profile::kProfileConstrainedBaseline, webrtc::H264Level::kLevel3_1, "0"),
};
}
} // namespace WebCore
#endif
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