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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   uint8_t speed;
50 } LAYER_CONTEXT;
51 
52 typedef struct {
53   int spatial_layer_id;
54   int temporal_layer_id;
55   int number_spatial_layers;
56   int number_temporal_layers;
57 
58   int spatial_layer_to_encode;
59   int first_spatial_layer_to_encode;
60   int rc_drop_superframe;
61 
62   // Workaround for multiple frame contexts
63   enum { ENCODED = 0, ENCODING, NEED_TO_ENCODE } encode_empty_frame_state;
64   struct lookahead_entry empty_frame;
65   int encode_intra_empty_frame;
66 
67   // Store scaled source frames to be used for temporal filter to generate
68   // a alt ref frame.
69   YV12_BUFFER_CONFIG scaled_frames[MAX_LAG_BUFFERS];
70   // Temp buffer used for 2-stage down-sampling, for real-time mode.
71   YV12_BUFFER_CONFIG scaled_temp;
72   int scaled_one_half;
73   int scaled_temp_is_alloc;
74 
75   // Layer context used for rate control in one pass temporal CBR mode or
76   // two pass spatial mode.
77   LAYER_CONTEXT layer_context[VPX_MAX_LAYERS];
78   // Indicates what sort of temporal layering is used.
79   // Currently, this only works for CBR mode.
80   VP9E_TEMPORAL_LAYERING_MODE temporal_layering_mode;
81   // Frame flags and buffer indexes for each spatial layer, set by the
82   // application (external settings).
83   int ext_frame_flags[VPX_MAX_LAYERS];
84   int ext_lst_fb_idx[VPX_MAX_LAYERS];
85   int ext_gld_fb_idx[VPX_MAX_LAYERS];
86   int ext_alt_fb_idx[VPX_MAX_LAYERS];
87   int ref_frame_index[REF_FRAMES];
88   int force_zero_mode_spatial_ref;
89   int current_superframe;
90   int use_base_mv;
91   // Used to control the downscaling filter for source scaling, for 1 pass CBR.
92   // downsample_filter_phase: = 0 will do sub-sampling (no weighted average),
93   // = 8 will center the target pixel and get a symmetric averaging filter.
94   // downsample_filter_type: 4 filters may be used: eighttap_regular,
95   // eighttap_smooth, eighttap_sharp, and bilinear.
96   INTERP_FILTER downsample_filter_type[VPX_SS_MAX_LAYERS];
97   int downsample_filter_phase[VPX_SS_MAX_LAYERS];
98 } SVC;
99 
100 struct VP9_COMP;
101 
102 // Initialize layer context data from init_config().
103 void vp9_init_layer_context(struct VP9_COMP *const cpi);
104 
105 // Update the layer context from a change_config() call.
106 void vp9_update_layer_context_change_config(struct VP9_COMP *const cpi,
107                                             const int target_bandwidth);
108 
109 // Prior to encoding the frame, update framerate-related quantities
110 // for the current temporal layer.
111 void vp9_update_temporal_layer_framerate(struct VP9_COMP *const cpi);
112 
113 // Update framerate-related quantities for the current spatial layer.
114 void vp9_update_spatial_layer_framerate(struct VP9_COMP *const cpi,
115                                         double framerate);
116 
117 // Prior to encoding the frame, set the layer context, for the current layer
118 // to be encoded, to the cpi struct.
119 void vp9_restore_layer_context(struct VP9_COMP *const cpi);
120 
121 // Save the layer context after encoding the frame.
122 void vp9_save_layer_context(struct VP9_COMP *const cpi);
123 
124 // Initialize second pass rc for spatial svc.
125 void vp9_init_second_pass_spatial_svc(struct VP9_COMP *cpi);
126 
127 // Increment number of video frames in layer
128 void vp9_inc_frame_in_layer(struct VP9_COMP *const cpi);
129 
130 // Check if current layer is key frame in spatial upper layer
131 int vp9_is_upper_layer_key_frame(const struct VP9_COMP *const cpi);
132 
133 // Get the next source buffer to encode
134 struct lookahead_entry *vp9_svc_lookahead_pop(struct VP9_COMP *const cpi,
135                                               struct lookahead_ctx *ctx,
136                                               int drain);
137 
138 // Start a frame and initialize svc parameters
139 int vp9_svc_start_frame(struct VP9_COMP *const cpi);
140 
141 int vp9_one_pass_cbr_svc_start_layer(struct VP9_COMP *const cpi);
142 
143 void vp9_free_svc_cyclic_refresh(struct VP9_COMP *const cpi);
144 
145 void vp9_svc_reset_key_frame(struct VP9_COMP *const cpi);
146 
147 #ifdef __cplusplus
148 }  // extern "C"
149 #endif
150 
151 #endif  // VP9_ENCODER_VP9_SVC_LAYERCONTEXT_
152