| /* 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. |
| */ |
| /* |
| * This file defines classes for doing temporal layers with VP8. |
| */ |
| #ifndef WEBRTC_MODULES_VIDEO_CODING_CODECS_VP8_TEMPORAL_LAYERS_H_ |
| #define WEBRTC_MODULES_VIDEO_CODING_CODECS_VP8_TEMPORAL_LAYERS_H_ |
| |
| #include <typedefs.h> |
| |
| // VPX forward declaration |
| typedef struct vpx_codec_enc_cfg vpx_codec_enc_cfg_t; |
| |
| namespace webrtc { |
| |
| struct CodecSpecificInfoVP8; |
| |
| class TemporalLayers { |
| public: |
| TemporalLayers(int number_of_temporal_layers); |
| |
| // Returns the recommended VP8 encode flags needed. May refresh the decoder |
| // and/or update the reference buffers. |
| int EncodeFlags(); |
| |
| bool ConfigureBitrates(int bitrate_kbit, vpx_codec_enc_cfg_t* cfg); |
| |
| void PopulateCodecSpecific(bool key_frame, CodecSpecificInfoVP8 *vp8_info, |
| uint32_t timestamp); |
| |
| private: |
| enum TemporalReferences { |
| // First base layer frame for 3 temporal layers, which updates last and |
| // golden with alt ref dependency. |
| kTemporalUpdateLastAndGoldenRefAltRef = 11, |
| // First enhancement layer with alt ref dependency. |
| kTemporalUpdateGoldenRefAltRef = 10, |
| // First enhancement layer with alt ref dependency. |
| kTemporalUpdateGoldenWithoutDependencyRefAltRef = 9, |
| // Base layer with alt ref dependency. |
| kTemporalUpdateLastRefAltRef = 8, |
| // Highest enhacement layer without dependency on golden with alt ref |
| // dependency. |
| kTemporalUpdateNoneNoRefGoldenRefAltRef = 7, |
| // Second layer and last frame in cycle, for 2 layers. |
| kTemporalUpdateNoneNoRefAltref = 6, |
| // Highest enhancement layer. |
| kTemporalUpdateNone = 5, |
| // Second enhancement layer. |
| kTemporalUpdateAltref = 4, |
| // Second enhancement layer without dependency on previous frames in |
| // the second enhancement layer. |
| kTemporalUpdateAltrefWithoutDependency = 3, |
| // First enhancement layer. |
| kTemporalUpdateGolden = 2, |
| // First enhancement layer without dependency on previous frames in |
| // the first enhancement layer. |
| kTemporalUpdateGoldenWithoutDependency = 1, |
| // Base layer. |
| kTemporalUpdateLast = 0, |
| }; |
| enum { kMaxTemporalPattern = 16 }; |
| |
| int number_of_temporal_layers_; |
| int temporal_ids_length_; |
| int temporal_ids_[kMaxTemporalPattern]; |
| int temporal_pattern_length_; |
| TemporalReferences temporal_pattern_[kMaxTemporalPattern]; |
| uint8_t tl0_pic_idx_; |
| uint8_t pattern_idx_; |
| uint32_t timestamp_; |
| }; |
| } // namespace webrtc |
| #endif // WEBRTC_MODULES_VIDEO_CODING_CODECS_VP8_TEMPORAL_LAYERS_H_ |
| |