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 // Cyclic refresh parameters (aq-mode=3), that need to be updated per-frame. 45 int sb_index; 46 signed char *map; 47 uint8_t *last_coded_q_map; 48 uint8_t *consec_zero_mv; 49 } LAYER_CONTEXT; 50 51 typedef struct { 52 int spatial_layer_id; 53 int temporal_layer_id; 54 int number_spatial_layers; 55 int number_temporal_layers; 56 57 int spatial_layer_to_encode; 58 int first_spatial_layer_to_encode; 59 60 // Workaround for multiple frame contexts 61 enum { 62 ENCODED = 0, 63 ENCODING, 64 NEED_TO_ENCODE 65 }encode_empty_frame_state; 66 struct lookahead_entry empty_frame; 67 int encode_intra_empty_frame; 68 69 // Store scaled source frames to be used for temporal filter to generate 70 // a alt ref frame. 71 YV12_BUFFER_CONFIG scaled_frames[MAX_LAG_BUFFERS]; 72 73 // Layer context used for rate control in one pass temporal CBR mode or 74 // two pass spatial mode. 75 LAYER_CONTEXT layer_context[VPX_MAX_LAYERS]; 76 // Indicates what sort of temporal layering is used. 77 // Currently, this only works for CBR mode. 78 VP9E_TEMPORAL_LAYERING_MODE temporal_layering_mode; 79 // Frame flags and buffer indexes for each spatial layer, set by the 80 // application (external settings). 81 int ext_frame_flags[VPX_MAX_LAYERS]; 82 int ext_lst_fb_idx[VPX_MAX_LAYERS]; 83 int ext_gld_fb_idx[VPX_MAX_LAYERS]; 84 int ext_alt_fb_idx[VPX_MAX_LAYERS]; 85 } SVC; 86 87 struct VP9_COMP; 88 89 // Initialize layer context data from init_config(). 90 void vp9_init_layer_context(struct VP9_COMP *const cpi); 91 92 // Update the layer context from a change_config() call. 93 void vp9_update_layer_context_change_config(struct VP9_COMP *const cpi, 94 const int target_bandwidth); 95 96 // Prior to encoding the frame, update framerate-related quantities 97 // for the current temporal layer. 98 void vp9_update_temporal_layer_framerate(struct VP9_COMP *const cpi); 99 100 // Update framerate-related quantities for the current spatial layer. 101 void vp9_update_spatial_layer_framerate(struct VP9_COMP *const cpi, 102 double framerate); 103 104 // Prior to encoding the frame, set the layer context, for the current layer 105 // to be encoded, to the cpi struct. 106 void vp9_restore_layer_context(struct VP9_COMP *const cpi); 107 108 // Save the layer context after encoding the frame. 109 void vp9_save_layer_context(struct VP9_COMP *const cpi); 110 111 // Initialize second pass rc for spatial svc. 112 void vp9_init_second_pass_spatial_svc(struct VP9_COMP *cpi); 113 114 // Increment number of video frames in layer 115 void vp9_inc_frame_in_layer(struct VP9_COMP *const cpi); 116 117 // Check if current layer is key frame in spatial upper layer 118 int vp9_is_upper_layer_key_frame(const struct VP9_COMP *const cpi); 119 120 // Get the next source buffer to encode 121 struct lookahead_entry *vp9_svc_lookahead_pop(struct VP9_COMP *const cpi, 122 struct lookahead_ctx *ctx, 123 int drain); 124 125 // Start a frame and initialize svc parameters 126 int vp9_svc_start_frame(struct VP9_COMP *const cpi); 127 128 int vp9_one_pass_cbr_svc_start_layer(struct VP9_COMP *const cpi); 129 130 void vp9_free_svc_cyclic_refresh(struct VP9_COMP *const cpi); 131 132 #ifdef __cplusplus 133 } // extern "C" 134 #endif 135 136 #endif // VP9_ENCODER_VP9_SVC_LAYERCONTEXT_ 137