| /* |
| * Copyright (c) 2018 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 "call/rtp_payload_params.h" |
| |
| #include "modules/rtp_rtcp/include/rtp_rtcp_defines.h" |
| #include "modules/video_coding/include/video_codec_interface.h" |
| #include "rtc_base/checks.h" |
| #include "rtc_base/logging.h" |
| #include "rtc_base/random.h" |
| #include "rtc_base/timeutils.h" |
| #include "system_wrappers/include/field_trial.h" |
| |
| namespace webrtc { |
| |
| namespace { |
| void PopulateRtpWithCodecSpecifics(const CodecSpecificInfo& info, |
| absl::optional<int> spatial_index, |
| RTPVideoHeader* rtp) { |
| rtp->codec = info.codecType; |
| switch (info.codecType) { |
| case kVideoCodecVP8: { |
| auto& vp8_header = rtp->video_type_header.emplace<RTPVideoHeaderVP8>(); |
| vp8_header.InitRTPVideoHeaderVP8(); |
| vp8_header.nonReference = info.codecSpecific.VP8.nonReference; |
| vp8_header.temporalIdx = info.codecSpecific.VP8.temporalIdx; |
| vp8_header.layerSync = info.codecSpecific.VP8.layerSync; |
| vp8_header.keyIdx = info.codecSpecific.VP8.keyIdx; |
| rtp->simulcastIdx = spatial_index.value_or(0); |
| return; |
| } |
| case kVideoCodecVP9: { |
| auto& vp9_header = rtp->video_type_header.emplace<RTPVideoHeaderVP9>(); |
| vp9_header.InitRTPVideoHeaderVP9(); |
| vp9_header.inter_pic_predicted = |
| info.codecSpecific.VP9.inter_pic_predicted; |
| vp9_header.flexible_mode = info.codecSpecific.VP9.flexible_mode; |
| vp9_header.ss_data_available = info.codecSpecific.VP9.ss_data_available; |
| vp9_header.non_ref_for_inter_layer_pred = |
| info.codecSpecific.VP9.non_ref_for_inter_layer_pred; |
| vp9_header.temporal_idx = info.codecSpecific.VP9.temporal_idx; |
| vp9_header.temporal_up_switch = info.codecSpecific.VP9.temporal_up_switch; |
| vp9_header.inter_layer_predicted = |
| info.codecSpecific.VP9.inter_layer_predicted; |
| vp9_header.gof_idx = info.codecSpecific.VP9.gof_idx; |
| vp9_header.num_spatial_layers = info.codecSpecific.VP9.num_spatial_layers; |
| if (vp9_header.num_spatial_layers > 1) { |
| vp9_header.spatial_idx = spatial_index.value_or(kNoSpatialIdx); |
| } else { |
| vp9_header.spatial_idx = kNoSpatialIdx; |
| } |
| if (info.codecSpecific.VP9.ss_data_available) { |
| vp9_header.spatial_layer_resolution_present = |
| info.codecSpecific.VP9.spatial_layer_resolution_present; |
| if (info.codecSpecific.VP9.spatial_layer_resolution_present) { |
| for (size_t i = 0; i < info.codecSpecific.VP9.num_spatial_layers; |
| ++i) { |
| vp9_header.width[i] = info.codecSpecific.VP9.width[i]; |
| vp9_header.height[i] = info.codecSpecific.VP9.height[i]; |
| } |
| } |
| vp9_header.gof.CopyGofInfoVP9(info.codecSpecific.VP9.gof); |
| } |
| |
| vp9_header.num_ref_pics = info.codecSpecific.VP9.num_ref_pics; |
| for (int i = 0; i < info.codecSpecific.VP9.num_ref_pics; ++i) { |
| vp9_header.pid_diff[i] = info.codecSpecific.VP9.p_diff[i]; |
| } |
| vp9_header.end_of_picture = info.codecSpecific.VP9.end_of_picture; |
| return; |
| } |
| case kVideoCodecH264: { |
| auto& h264_header = rtp->video_type_header.emplace<RTPVideoHeaderH264>(); |
| h264_header.packetization_mode = |
| info.codecSpecific.H264.packetization_mode; |
| rtp->simulcastIdx = spatial_index.value_or(0); |
| return; |
| } |
| case kVideoCodecMultiplex: |
| case kVideoCodecGeneric: |
| rtp->codec = kVideoCodecGeneric; |
| rtp->simulcastIdx = spatial_index.value_or(0); |
| return; |
| default: |
| return; |
| } |
| } |
| |
| void SetVideoTiming(const EncodedImage& image, VideoSendTiming* timing) { |
| if (image.timing_.flags == VideoSendTiming::TimingFrameFlags::kInvalid || |
| image.timing_.flags == VideoSendTiming::TimingFrameFlags::kNotTriggered) { |
| timing->flags = VideoSendTiming::TimingFrameFlags::kInvalid; |
| return; |
| } |
| |
| timing->encode_start_delta_ms = VideoSendTiming::GetDeltaCappedMs( |
| image.capture_time_ms_, image.timing_.encode_start_ms); |
| timing->encode_finish_delta_ms = VideoSendTiming::GetDeltaCappedMs( |
| image.capture_time_ms_, image.timing_.encode_finish_ms); |
| timing->packetization_finish_delta_ms = 0; |
| timing->pacer_exit_delta_ms = 0; |
| timing->network_timestamp_delta_ms = 0; |
| timing->network2_timestamp_delta_ms = 0; |
| timing->flags = image.timing_.flags; |
| } |
| } // namespace |
| |
| RtpPayloadParams::RtpPayloadParams(const uint32_t ssrc, |
| const RtpPayloadState* state) |
| : ssrc_(ssrc), |
| generic_picture_id_experiment_( |
| field_trial::IsEnabled("WebRTC-GenericPictureId")), |
| generic_descriptor_experiment_( |
| field_trial::IsEnabled("WebRTC-GenericDescriptor")) { |
| for (auto& spatial_layer : last_shared_frame_id_) |
| spatial_layer.fill(-1); |
| |
| Random random(rtc::TimeMicros()); |
| state_.picture_id = |
| state ? state->picture_id : (random.Rand<int16_t>() & 0x7FFF); |
| state_.tl0_pic_idx = state ? state->tl0_pic_idx : (random.Rand<uint8_t>()); |
| } |
| |
| RtpPayloadParams::RtpPayloadParams(const RtpPayloadParams& other) = default; |
| |
| RtpPayloadParams::~RtpPayloadParams() {} |
| |
| RTPVideoHeader RtpPayloadParams::GetRtpVideoHeader( |
| const EncodedImage& image, |
| const CodecSpecificInfo* codec_specific_info, |
| int64_t shared_frame_id) { |
| RTPVideoHeader rtp_video_header; |
| if (codec_specific_info) { |
| PopulateRtpWithCodecSpecifics(*codec_specific_info, image.SpatialIndex(), |
| &rtp_video_header); |
| } |
| rtp_video_header.rotation = image.rotation_; |
| rtp_video_header.content_type = image.content_type_; |
| rtp_video_header.playout_delay = image.playout_delay_; |
| |
| SetVideoTiming(image, &rtp_video_header.video_timing); |
| |
| const bool is_keyframe = image._frameType == kVideoFrameKey; |
| const bool first_frame_in_picture = |
| (codec_specific_info && codec_specific_info->codecType == kVideoCodecVP9) |
| ? codec_specific_info->codecSpecific.VP9.first_frame_in_picture |
| : true; |
| |
| SetCodecSpecific(&rtp_video_header, first_frame_in_picture); |
| |
| if (generic_descriptor_experiment_) |
| SetGeneric(shared_frame_id, is_keyframe, &rtp_video_header); |
| |
| return rtp_video_header; |
| } |
| |
| uint32_t RtpPayloadParams::ssrc() const { |
| return ssrc_; |
| } |
| |
| RtpPayloadState RtpPayloadParams::state() const { |
| return state_; |
| } |
| |
| void RtpPayloadParams::SetCodecSpecific(RTPVideoHeader* rtp_video_header, |
| bool first_frame_in_picture) { |
| // Always set picture id. Set tl0_pic_idx iff temporal index is set. |
| if (first_frame_in_picture) { |
| state_.picture_id = (static_cast<uint16_t>(state_.picture_id) + 1) & 0x7FFF; |
| } |
| if (rtp_video_header->codec == kVideoCodecVP8) { |
| auto& vp8_header = |
| absl::get<RTPVideoHeaderVP8>(rtp_video_header->video_type_header); |
| vp8_header.pictureId = state_.picture_id; |
| |
| if (vp8_header.temporalIdx != kNoTemporalIdx) { |
| if (vp8_header.temporalIdx == 0) { |
| ++state_.tl0_pic_idx; |
| } |
| vp8_header.tl0PicIdx = state_.tl0_pic_idx; |
| } |
| } |
| if (rtp_video_header->codec == kVideoCodecVP9) { |
| auto& vp9_header = |
| absl::get<RTPVideoHeaderVP9>(rtp_video_header->video_type_header); |
| vp9_header.picture_id = state_.picture_id; |
| |
| // Note that in the case that we have no temporal layers but we do have |
| // spatial layers, packets will carry layering info with a temporal_idx of |
| // zero, and we then have to set and increment tl0_pic_idx. |
| if (vp9_header.temporal_idx != kNoTemporalIdx || |
| vp9_header.spatial_idx != kNoSpatialIdx) { |
| if (first_frame_in_picture && |
| (vp9_header.temporal_idx == 0 || |
| vp9_header.temporal_idx == kNoTemporalIdx)) { |
| ++state_.tl0_pic_idx; |
| } |
| vp9_header.tl0_pic_idx = state_.tl0_pic_idx; |
| } |
| } |
| // There are currently two generic descriptors in WebRTC. The old descriptor |
| // can not share a picture id space between simulcast streams, so we use the |
| // |picture_id| in this case. We let the |picture_id| tag along in |frame_id| |
| // until the old generic format can be removed. |
| // TODO(philipel): Remove this when the new generic format has been fully |
| // implemented. |
| if (generic_picture_id_experiment_ && |
| rtp_video_header->codec == kVideoCodecGeneric) { |
| rtp_video_header->generic.emplace().frame_id = state_.picture_id; |
| } |
| } |
| |
| void RtpPayloadParams::SetGeneric(int64_t frame_id, |
| bool is_keyframe, |
| RTPVideoHeader* rtp_video_header) { |
| if (rtp_video_header->codec == kVideoCodecVP8) { |
| Vp8ToGeneric(frame_id, is_keyframe, rtp_video_header); |
| } |
| |
| // TODO(philipel): Implement VP9 to new generic descriptor. |
| // TODO(philipel): Implement H264 to new generic descriptor. |
| // TODO(philipel): Implement generic codec to new generic descriptor. |
| } |
| |
| void RtpPayloadParams::Vp8ToGeneric(int64_t shared_frame_id, |
| bool is_keyframe, |
| RTPVideoHeader* rtp_video_header) { |
| const auto& vp8_header = |
| absl::get<RTPVideoHeaderVP8>(rtp_video_header->video_type_header); |
| const int spatial_index = 0; |
| const int temporal_index = |
| vp8_header.temporalIdx != kNoTemporalIdx ? vp8_header.temporalIdx : 0; |
| |
| if (temporal_index >= RtpGenericFrameDescriptor::kMaxTemporalLayers || |
| spatial_index >= RtpGenericFrameDescriptor::kMaxSpatialLayers) { |
| RTC_LOG(LS_WARNING) << "Temporal and/or spatial index is too high to be " |
| "used with generic frame descriptor."; |
| return; |
| } |
| |
| RTPVideoHeader::GenericDescriptorInfo& generic = |
| rtp_video_header->generic.emplace(); |
| |
| generic.frame_id = shared_frame_id; |
| generic.spatial_index = spatial_index; |
| generic.temporal_index = temporal_index; |
| |
| if (is_keyframe) { |
| RTC_DCHECK_EQ(temporal_index, 0); |
| last_shared_frame_id_[spatial_index].fill(-1); |
| last_shared_frame_id_[spatial_index][temporal_index] = shared_frame_id; |
| return; |
| } |
| |
| if (vp8_header.layerSync) { |
| int64_t tl0_frame_id = last_shared_frame_id_[spatial_index][0]; |
| |
| for (int i = 1; i < RtpGenericFrameDescriptor::kMaxTemporalLayers; ++i) { |
| if (last_shared_frame_id_[spatial_index][i] < tl0_frame_id) { |
| last_shared_frame_id_[spatial_index][i] = -1; |
| } |
| } |
| |
| RTC_DCHECK_GE(tl0_frame_id, 0); |
| RTC_DCHECK_LT(tl0_frame_id, shared_frame_id); |
| generic.dependencies.push_back(tl0_frame_id); |
| } else { |
| for (int i = 0; i <= temporal_index; ++i) { |
| int64_t frame_id = last_shared_frame_id_[spatial_index][i]; |
| |
| if (frame_id != -1) { |
| RTC_DCHECK_LT(frame_id, shared_frame_id); |
| generic.dependencies.push_back(frame_id); |
| } |
| } |
| } |
| |
| last_shared_frame_id_[spatial_index][temporal_index] = shared_frame_id; |
| } |
| |
| } // namespace webrtc |
