121 lines
3.5 KiB
C++
121 lines
3.5 KiB
C++
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/*
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* Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*
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*/
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#include "modules/video_coding/codecs/h264/include/h264.h"
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#include <memory>
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#include <string>
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#include "absl/types/optional.h"
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#include "api/video_codecs/sdp_video_format.h"
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#include "media/base/media_constants.h"
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#if defined(WEBRTC_USE_H264)
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#include "modules/video_coding/codecs/h264/h264_decoder_impl.h"
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#include "modules/video_coding/codecs/h264/h264_encoder_impl.h"
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#endif
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#include "rtc_base/checks.h"
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#include "rtc_base/logging.h"
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namespace webrtc {
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namespace {
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#if defined(WEBRTC_USE_H264)
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bool g_rtc_use_h264 = true;
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#endif
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// If H.264 OpenH264/FFmpeg codec is supported.
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bool IsH264CodecSupported() {
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#if defined(WEBRTC_USE_H264)
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return g_rtc_use_h264;
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#else
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return false;
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#endif
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}
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} // namespace
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SdpVideoFormat CreateH264Format(H264::Profile profile,
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H264::Level level,
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const std::string& packetization_mode) {
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const absl::optional<std::string> profile_string =
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H264::ProfileLevelIdToString(H264::ProfileLevelId(profile, level));
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RTC_CHECK(profile_string);
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return SdpVideoFormat(
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cricket::kH264CodecName,
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{{cricket::kH264FmtpProfileLevelId, *profile_string},
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{cricket::kH264FmtpLevelAsymmetryAllowed, "1"},
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{cricket::kH264FmtpPacketizationMode, packetization_mode}});
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}
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void DisableRtcUseH264() {
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#if defined(WEBRTC_USE_H264)
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g_rtc_use_h264 = false;
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#endif
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}
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std::vector<SdpVideoFormat> SupportedH264Codecs() {
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if (!IsH264CodecSupported())
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return std::vector<SdpVideoFormat>();
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// We only support encoding Constrained Baseline Profile (CBP), but the
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// decoder supports more profiles. We can list all profiles here that are
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// supported by the decoder and that are also supersets of CBP, i.e. the
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// decoder for that profile is required to be able to decode CBP. This means
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// we can encode and send CBP even though we negotiated a potentially
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// higher profile. See the H264 spec for more information.
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//
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// We support both packetization modes 0 (mandatory) and 1 (optional,
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// preferred).
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return {
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CreateH264Format(H264::kProfileBaseline, H264::kLevel3_1, "1"),
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CreateH264Format(H264::kProfileBaseline, H264::kLevel3_1, "0"),
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CreateH264Format(H264::kProfileConstrainedBaseline, H264::kLevel3_1, "1"),
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CreateH264Format(H264::kProfileConstrainedBaseline, H264::kLevel3_1,
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"0")};
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}
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std::unique_ptr<H264Encoder> H264Encoder::Create(
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const cricket::VideoCodec& codec) {
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RTC_DCHECK(H264Encoder::IsSupported());
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#if defined(WEBRTC_USE_H264)
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RTC_CHECK(g_rtc_use_h264);
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RTC_LOG(LS_INFO) << "Creating H264EncoderImpl.";
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return std::make_unique<H264EncoderImpl>(codec);
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#else
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RTC_NOTREACHED();
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return nullptr;
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#endif
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}
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bool H264Encoder::IsSupported() {
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return IsH264CodecSupported();
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}
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std::unique_ptr<H264Decoder> H264Decoder::Create() {
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RTC_DCHECK(H264Decoder::IsSupported());
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#if defined(WEBRTC_USE_H264)
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RTC_CHECK(g_rtc_use_h264);
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RTC_LOG(LS_INFO) << "Creating H264DecoderImpl.";
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return std::make_unique<H264DecoderImpl>();
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#else
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RTC_NOTREACHED();
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return nullptr;
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#endif
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}
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bool H264Decoder::IsSupported() {
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return IsH264CodecSupported();
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}
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} // namespace webrtc
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