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/* 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.
#include <typedefs.h>
// VPX forward declaration
typedef struct vpx_codec_enc_cfg vpx_codec_enc_cfg_t;
namespace webrtc {
struct CodecSpecificInfoVP8;
class TemporalLayers {
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);
enum TemporalReferences {
// 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_;
} // namespace webrtc