1 /* 2 * Copyright (c) 2014 The WebM project authors. All Rights Reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11 #ifndef VP9_ENCODER_VP9_SVC_LAYERCONTEXT_H_ 12 #define VP9_ENCODER_VP9_SVC_LAYERCONTEXT_H_ 13 14 #include "vpx/vpx_encoder.h" 15 16 #include "vp9/encoder/vp9_ratectrl.h" 17 18 #ifdef __cplusplus 19 extern "C" { 20 #endif 21 22 typedef struct { 23 RATE_CONTROL rc; 24 int target_bandwidth; 25 int spatial_layer_target_bandwidth; // Target for the spatial layer. 26 double framerate; 27 int avg_frame_size; 28 int max_q; 29 int min_q; 30 int scaling_factor_num; 31 int scaling_factor_den; 32 TWO_PASS twopass; 33 vpx_fixed_buf_t rc_twopass_stats_in; 34 unsigned int current_video_frame_in_layer; 35 int is_key_frame; 36 int frames_from_key_frame; 37 FRAME_TYPE last_frame_type; 38 struct lookahead_entry *alt_ref_source; 39 int alt_ref_idx; 40 int gold_ref_idx; 41 int has_alt_frame; 42 size_t layer_size; 43 struct vpx_psnr_pkt psnr_pkt; 44 } LAYER_CONTEXT; 45 46 typedef struct { 47 int spatial_layer_id; 48 int temporal_layer_id; 49 int number_spatial_layers; 50 int number_temporal_layers; 51 52 int spatial_layer_to_encode; 53 54 // Workaround for multiple frame contexts 55 enum { 56 ENCODED = 0, 57 ENCODING, 58 NEED_TO_ENCODE 59 }encode_empty_frame_state; 60 struct lookahead_entry empty_frame; 61 int encode_intra_empty_frame; 62 63 // Store scaled source frames to be used for temporal filter to generate 64 // a alt ref frame. 65 YV12_BUFFER_CONFIG scaled_frames[MAX_LAG_BUFFERS]; 66 67 // Layer context used for rate control in one pass temporal CBR mode or 68 // two pass spatial mode. 69 LAYER_CONTEXT layer_context[VPX_MAX_LAYERS]; 70 // Indicates what sort of temporal layering is used. 71 // Currently, this only works for CBR mode. 72 VP9E_TEMPORAL_LAYERING_MODE temporal_layering_mode; 73 } SVC; 74 75 struct VP9_COMP; 76 77 // Initialize layer context data from init_config(). 78 void vp9_init_layer_context(struct VP9_COMP *const cpi); 79 80 // Update the layer context from a change_config() call. 81 void vp9_update_layer_context_change_config(struct VP9_COMP *const cpi, 82 const int target_bandwidth); 83 84 // Prior to encoding the frame, update framerate-related quantities 85 // for the current temporal layer. 86 void vp9_update_temporal_layer_framerate(struct VP9_COMP *const cpi); 87 88 // Update framerate-related quantities for the current spatial layer. 89 void vp9_update_spatial_layer_framerate(struct VP9_COMP *const cpi, 90 double framerate); 91 92 // Prior to encoding the frame, set the layer context, for the current layer 93 // to be encoded, to the cpi struct. 94 void vp9_restore_layer_context(struct VP9_COMP *const cpi); 95 96 // Save the layer context after encoding the frame. 97 void vp9_save_layer_context(struct VP9_COMP *const cpi); 98 99 // Initialize second pass rc for spatial svc. 100 void vp9_init_second_pass_spatial_svc(struct VP9_COMP *cpi); 101 102 // Increment number of video frames in layer 103 void vp9_inc_frame_in_layer(struct VP9_COMP *const cpi); 104 105 // Check if current layer is key frame in spatial upper layer 106 int vp9_is_upper_layer_key_frame(const struct VP9_COMP *const cpi); 107 108 // Get the next source buffer to encode 109 struct lookahead_entry *vp9_svc_lookahead_pop(struct VP9_COMP *const cpi, 110 struct lookahead_ctx *ctx, 111 int drain); 112 113 // Start a frame and initialize svc parameters 114 int vp9_svc_start_frame(struct VP9_COMP *const cpi); 115 116 int vp9_one_pass_cbr_svc_start_layer(struct VP9_COMP *const cpi); 117 118 #ifdef __cplusplus 119 } // extern "C" 120 #endif 121 122 #endif // VP9_ENCODER_VP9_SVC_LAYERCONTEXT_ 123