| /* Copyright (c) 2011 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 "temporal_layers.h" |
| |
| #include <stdlib.h> |
| #include <string.h> |
| #include <cassert> |
| |
| #include "modules/interface/module_common_types.h" |
| #include "modules/video_coding/codecs/interface/video_codec_interface.h" |
| #include "modules/video_coding/codecs/vp8/main/interface/vp8_common_types.h" |
| |
| #include "vpx/vpx_encoder.h" |
| #include "vpx/vp8cx.h" |
| |
| namespace webrtc { |
| |
| TemporalLayers::TemporalLayers(int numberOfTemporalLayers) |
| : number_of_temporal_layers_(numberOfTemporalLayers), |
| temporal_ids_length_(0), |
| temporal_pattern_length_(0), |
| tl0_pic_idx_(rand()), |
| pattern_idx_(255) { |
| assert(kMaxTemporalStreams >= numberOfTemporalLayers); |
| memset(temporal_ids_, 0, sizeof(temporal_ids_)); |
| memset(temporal_pattern_, 0, sizeof(temporal_pattern_)); |
| } |
| |
| bool TemporalLayers::ConfigureBitrates(int bitrateKbit, |
| vpx_codec_enc_cfg_t* cfg) { |
| switch (number_of_temporal_layers_) { |
| case 0: |
| case 1: |
| // Do nothing. |
| break; |
| case 2: |
| temporal_ids_length_ = 2; |
| temporal_ids_[0] = 0; |
| temporal_ids_[1] = 1; |
| cfg->ts_number_layers = number_of_temporal_layers_; |
| cfg->ts_periodicity = temporal_ids_length_; |
| // Split stream 60% 40%. |
| // Bitrate API for VP8 is the agregated bitrate for all lower layers. |
| cfg->ts_target_bitrate[0] = bitrateKbit * kVp8LayerRateAlloction[1][0]; |
| cfg->ts_target_bitrate[1] = bitrateKbit; |
| cfg->ts_rate_decimator[0] = 2; |
| cfg->ts_rate_decimator[1] = 1; |
| memcpy(cfg->ts_layer_id, |
| temporal_ids_, |
| sizeof(unsigned int) * temporal_ids_length_); |
| temporal_pattern_length_ = 8; |
| temporal_pattern_[0] = kTemporalUpdateLast; |
| temporal_pattern_[1] = kTemporalUpdateGoldenWithoutDependency; |
| temporal_pattern_[2] = kTemporalUpdateLast; |
| temporal_pattern_[3] = kTemporalUpdateGolden; |
| temporal_pattern_[4] = kTemporalUpdateLast; |
| temporal_pattern_[5] = kTemporalUpdateGolden; |
| temporal_pattern_[6] = kTemporalUpdateLast; |
| temporal_pattern_[7] = kTemporalUpdateNoneNoRefAltref; |
| break; |
| case 3: |
| temporal_ids_length_ = 4; |
| temporal_ids_[0] = 0; |
| temporal_ids_[1] = 2; |
| temporal_ids_[2] = 1; |
| temporal_ids_[3] = 2; |
| cfg->ts_number_layers = number_of_temporal_layers_; |
| cfg->ts_periodicity = temporal_ids_length_; |
| // Split stream 40% 20% 40%. |
| // Bitrate API for VP8 is the agregated bitrate for all lower layers. |
| cfg->ts_target_bitrate[0] = bitrateKbit * kVp8LayerRateAlloction[2][0]; |
| cfg->ts_target_bitrate[1] = bitrateKbit * kVp8LayerRateAlloction[2][1]; |
| cfg->ts_target_bitrate[2] = bitrateKbit; |
| cfg->ts_rate_decimator[0] = 4; |
| cfg->ts_rate_decimator[1] = 2; |
| cfg->ts_rate_decimator[2] = 1; |
| memcpy(cfg->ts_layer_id, |
| temporal_ids_, |
| sizeof(unsigned int) * temporal_ids_length_); |
| temporal_pattern_length_ = 8; |
| temporal_pattern_[0] = kTemporalUpdateLast; |
| temporal_pattern_[1] = kTemporalUpdateAltrefWithoutDependency; |
| temporal_pattern_[2] = kTemporalUpdateGoldenWithoutDependency; |
| temporal_pattern_[3] = kTemporalUpdateAltref; |
| temporal_pattern_[4] = kTemporalUpdateLast; |
| temporal_pattern_[5] = kTemporalUpdateAltref; |
| temporal_pattern_[6] = kTemporalUpdateGolden; |
| temporal_pattern_[7] = kTemporalUpdateNone; |
| break; |
| case 4: |
| temporal_ids_length_ = 8; |
| temporal_ids_[0] = 0; |
| temporal_ids_[1] = 3; |
| temporal_ids_[2] = 2; |
| temporal_ids_[3] = 3; |
| temporal_ids_[4] = 1; |
| temporal_ids_[5] = 3; |
| temporal_ids_[6] = 2; |
| temporal_ids_[7] = 3; |
| // Split stream 25% 15% 20% 40%. |
| // Bitrate API for VP8 is the agregated bitrate for all lower layers. |
| cfg->ts_number_layers = 4; |
| cfg->ts_periodicity = temporal_ids_length_; |
| cfg->ts_target_bitrate[0] = bitrateKbit * kVp8LayerRateAlloction[3][0]; |
| cfg->ts_target_bitrate[1] = bitrateKbit * kVp8LayerRateAlloction[3][1]; |
| cfg->ts_target_bitrate[2] = bitrateKbit * kVp8LayerRateAlloction[3][2]; |
| cfg->ts_target_bitrate[3] = bitrateKbit; |
| cfg->ts_rate_decimator[0] = 8; |
| cfg->ts_rate_decimator[1] = 4; |
| cfg->ts_rate_decimator[2] = 2; |
| cfg->ts_rate_decimator[3] = 1; |
| memcpy(cfg->ts_layer_id, |
| temporal_ids_, |
| sizeof(unsigned int) * temporal_ids_length_); |
| temporal_pattern_length_ = 16; |
| temporal_pattern_[0] = kTemporalUpdateLast; |
| temporal_pattern_[1] = kTemporalUpdateNone; |
| temporal_pattern_[2] = kTemporalUpdateAltrefWithoutDependency; |
| temporal_pattern_[3] = kTemporalUpdateNone; |
| temporal_pattern_[4] = kTemporalUpdateGoldenWithoutDependency; |
| temporal_pattern_[5] = kTemporalUpdateNone; |
| temporal_pattern_[6] = kTemporalUpdateAltref; |
| temporal_pattern_[7] = kTemporalUpdateNone; |
| temporal_pattern_[8] = kTemporalUpdateLast; |
| temporal_pattern_[9] = kTemporalUpdateNone; |
| temporal_pattern_[10] = kTemporalUpdateAltref; |
| temporal_pattern_[11] = kTemporalUpdateNone; |
| temporal_pattern_[12] = kTemporalUpdateGolden; |
| temporal_pattern_[13] = kTemporalUpdateNone; |
| temporal_pattern_[14] = kTemporalUpdateAltref; |
| temporal_pattern_[15] = kTemporalUpdateNone; |
| break; |
| default: |
| assert(false); |
| return false; |
| } |
| return true; |
| } |
| |
| int TemporalLayers::EncodeFlags() { |
| assert(number_of_temporal_layers_ > 1); |
| assert(kMaxTemporalPattern >= temporal_pattern_length_); |
| assert(0 < temporal_pattern_length_); |
| |
| int flags = 0; |
| int patternIdx = ++pattern_idx_ % temporal_pattern_length_; |
| assert(kMaxTemporalPattern >= patternIdx); |
| switch (temporal_pattern_[patternIdx]) { |
| case kTemporalUpdateLast: |
| flags |= VP8_EFLAG_NO_UPD_GF; |
| flags |= VP8_EFLAG_NO_UPD_ARF; |
| flags |= VP8_EFLAG_NO_REF_GF; |
| flags |= VP8_EFLAG_NO_REF_ARF; |
| break; |
| case kTemporalUpdateGoldenWithoutDependency: |
| flags |= VP8_EFLAG_NO_REF_GF; |
| // Deliberately no break here. |
| case kTemporalUpdateGolden: |
| flags |= VP8_EFLAG_NO_REF_ARF; |
| flags |= VP8_EFLAG_NO_UPD_ARF; |
| flags |= VP8_EFLAG_NO_UPD_LAST; |
| break; |
| case kTemporalUpdateAltrefWithoutDependency: |
| flags |= VP8_EFLAG_NO_REF_ARF; |
| flags |= VP8_EFLAG_NO_REF_GF; |
| // Deliberately no break here. |
| case kTemporalUpdateAltref: |
| flags |= VP8_EFLAG_NO_UPD_GF; |
| flags |= VP8_EFLAG_NO_UPD_LAST; |
| break; |
| case kTemporalUpdateNoneNoRefAltref: |
| flags |= VP8_EFLAG_NO_REF_ARF; |
| // Deliberately no break here. |
| case kTemporalUpdateNone: |
| flags |= VP8_EFLAG_NO_UPD_GF; |
| flags |= VP8_EFLAG_NO_UPD_ARF; |
| flags |= VP8_EFLAG_NO_UPD_LAST; |
| flags |= VP8_EFLAG_NO_UPD_ENTROPY; |
| break; |
| } |
| return flags; |
| } |
| |
| void TemporalLayers::PopulateCodecSpecific(bool key_frame, |
| CodecSpecificInfoVP8 *vp8_info) { |
| assert(number_of_temporal_layers_ > 1); |
| assert(0 < temporal_ids_length_); |
| |
| if (key_frame) { |
| // Keyframe is always temporal layer 0 |
| vp8_info->temporalIdx = 0; |
| } else { |
| vp8_info->temporalIdx = temporal_ids_[pattern_idx_ % temporal_ids_length_]; |
| } |
| TemporalReferences temporal_reference = |
| temporal_pattern_[pattern_idx_ % temporal_pattern_length_]; |
| |
| if (temporal_reference == kTemporalUpdateAltrefWithoutDependency || |
| temporal_reference == kTemporalUpdateGoldenWithoutDependency || |
| (temporal_reference == kTemporalUpdateNone && |
| number_of_temporal_layers_ == 4)) { |
| vp8_info->layerSync = true; |
| } else { |
| vp8_info->layerSync = false; |
| } |
| |
| if (vp8_info->temporalIdx == 0) { |
| tl0_pic_idx_++; |
| } |
| vp8_info->tl0PicIdx = tl0_pic_idx_; |
| } |
| } // namespace webrtc |
