| /* |
| * Copyright (c) 2015 The WebRTC project authors. All Rights Reserved. |
| * |
| * Use of this source code is governed by a BSD-style license |
| * that can be found in the LICENSE file in the root of the source |
| * tree. An additional intellectual property rights grant can be found |
| * in the file PATENTS. All contributing project authors may |
| * be found in the AUTHORS file in the root of the source tree. |
| * |
| */ |
| |
| #include "modules/video_coding/codecs/h264/include/h264.h" |
| |
| #include "api/video_codecs/sdp_video_format.h" |
| #include "media/base/h264_profile_level_id.h" |
| |
| #if defined(WEBRTC_USE_H264) |
| #include "modules/video_coding/codecs/h264/h264_decoder_impl.h" |
| #include "modules/video_coding/codecs/h264/h264_encoder_impl.h" |
| #endif |
| |
| #include "rtc_base/checks.h" |
| #include "rtc_base/logging.h" |
| #include "rtc_base/ptr_util.h" |
| |
| namespace webrtc { |
| |
| namespace { |
| |
| #if defined(WEBRTC_USE_H264) |
| bool g_rtc_use_h264 = true; |
| #endif |
| |
| // If H.264 OpenH264/FFmpeg codec is supported. |
| bool IsH264CodecSupported() { |
| #if defined(WEBRTC_USE_H264) |
| return g_rtc_use_h264; |
| #else |
| return false; |
| #endif |
| } |
| |
| SdpVideoFormat CreateH264Format(H264::Profile profile, |
| H264::Level level, |
| const std::string& packetization_mode) { |
| const absl::optional<std::string> profile_string = |
| H264::ProfileLevelIdToString(H264::ProfileLevelId(profile, level)); |
| RTC_CHECK(profile_string); |
| return SdpVideoFormat( |
| cricket::kH264CodecName, |
| {{cricket::kH264FmtpProfileLevelId, *profile_string}, |
| {cricket::kH264FmtpLevelAsymmetryAllowed, "1"}, |
| {cricket::kH264FmtpPacketizationMode, packetization_mode}}); |
| } |
| |
| } // namespace |
| |
| void DisableRtcUseH264() { |
| #if defined(WEBRTC_USE_H264) |
| g_rtc_use_h264 = false; |
| #endif |
| } |
| |
| std::vector<SdpVideoFormat> SupportedH264Codecs() { |
| if (!IsH264CodecSupported()) |
| return std::vector<SdpVideoFormat>(); |
| // 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(H264::kProfileBaseline, H264::kLevel3_1, "1"), |
| CreateH264Format(H264::kProfileBaseline, H264::kLevel3_1, "0"), |
| CreateH264Format(H264::kProfileConstrainedBaseline, H264::kLevel3_1, "1"), |
| CreateH264Format(H264::kProfileConstrainedBaseline, H264::kLevel3_1, |
| "0")}; |
| } |
| |
| std::unique_ptr<H264Encoder> H264Encoder::Create( |
| const cricket::VideoCodec& codec) { |
| RTC_DCHECK(H264Encoder::IsSupported()); |
| #if defined(WEBRTC_USE_H264) |
| RTC_CHECK(g_rtc_use_h264); |
| RTC_LOG(LS_INFO) << "Creating H264EncoderImpl."; |
| return rtc::MakeUnique<H264EncoderImpl>(codec); |
| #else |
| RTC_NOTREACHED(); |
| return nullptr; |
| #endif |
| } |
| |
| bool H264Encoder::IsSupported() { |
| return IsH264CodecSupported(); |
| } |
| |
| std::unique_ptr<H264Decoder> H264Decoder::Create() { |
| RTC_DCHECK(H264Decoder::IsSupported()); |
| #if defined(WEBRTC_USE_H264) |
| RTC_CHECK(g_rtc_use_h264); |
| RTC_LOG(LS_INFO) << "Creating H264DecoderImpl."; |
| return rtc::MakeUnique<H264DecoderImpl>(); |
| #else |
| RTC_NOTREACHED(); |
| return nullptr; |
| #endif |
| } |
| |
| bool H264Decoder::IsSupported() { |
| return IsH264CodecSupported(); |
| } |
| |
| } // namespace webrtc |