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 #include <math.h> 12 13 #include "vp9/encoder/vp9_onyx_int.h" 14 #include "vp9/encoder/vp9_svc_layercontext.h" 15 16 void vp9_init_layer_context(VP9_COMP *const cpi) { 17 SVC *const svc = &cpi->svc; 18 const VP9_CONFIG *const oxcf = &cpi->oxcf; 19 int layer; 20 int layer_end; 21 22 svc->spatial_layer_id = 0; 23 svc->temporal_layer_id = 0; 24 25 if (svc->number_temporal_layers > 1) { 26 layer_end = svc->number_temporal_layers; 27 } else { 28 layer_end = svc->number_spatial_layers; 29 } 30 31 for (layer = 0; layer < layer_end; ++layer) { 32 LAYER_CONTEXT *const lc = &svc->layer_context[layer]; 33 RATE_CONTROL *const lrc = &lc->rc; 34 lc->current_video_frame_in_layer = 0; 35 lrc->avg_frame_qindex[INTER_FRAME] = oxcf->worst_allowed_q; 36 lrc->ni_av_qi = oxcf->worst_allowed_q; 37 lrc->total_actual_bits = 0; 38 lrc->total_target_vs_actual = 0; 39 lrc->ni_tot_qi = 0; 40 lrc->tot_q = 0.0; 41 lrc->avg_q = 0.0; 42 lrc->ni_frames = 0; 43 lrc->decimation_count = 0; 44 lrc->decimation_factor = 0; 45 lrc->rate_correction_factor = 1.0; 46 lrc->key_frame_rate_correction_factor = 1.0; 47 48 if (svc->number_temporal_layers > 1) { 49 lc->target_bandwidth = oxcf->ts_target_bitrate[layer] * 1000; 50 lrc->last_q[INTER_FRAME] = oxcf->worst_allowed_q; 51 } else { 52 lc->target_bandwidth = oxcf->ss_target_bitrate[layer] * 1000; 53 lrc->last_q[0] = oxcf->best_allowed_q; 54 lrc->last_q[1] = oxcf->best_allowed_q; 55 lrc->last_q[2] = oxcf->best_allowed_q; 56 } 57 58 lrc->buffer_level = vp9_rescale((int)(oxcf->starting_buffer_level), 59 lc->target_bandwidth, 1000); 60 lrc->bits_off_target = lrc->buffer_level; 61 } 62 } 63 64 // Update the layer context from a change_config() call. 65 void vp9_update_layer_context_change_config(VP9_COMP *const cpi, 66 const int target_bandwidth) { 67 SVC *const svc = &cpi->svc; 68 const VP9_CONFIG *const oxcf = &cpi->oxcf; 69 const RATE_CONTROL *const rc = &cpi->rc; 70 int layer; 71 int layer_end; 72 float bitrate_alloc = 1.0; 73 74 if (svc->number_temporal_layers > 1) { 75 layer_end = svc->number_temporal_layers; 76 } else { 77 layer_end = svc->number_spatial_layers; 78 } 79 80 for (layer = 0; layer < layer_end; ++layer) { 81 LAYER_CONTEXT *const lc = &svc->layer_context[layer]; 82 RATE_CONTROL *const lrc = &lc->rc; 83 84 if (svc->number_temporal_layers > 1) { 85 lc->target_bandwidth = oxcf->ts_target_bitrate[layer] * 1000; 86 } else { 87 lc->target_bandwidth = oxcf->ss_target_bitrate[layer] * 1000; 88 } 89 bitrate_alloc = (float)lc->target_bandwidth / target_bandwidth; 90 // Update buffer-related quantities. 91 lc->starting_buffer_level = 92 (int64_t)(oxcf->starting_buffer_level * bitrate_alloc); 93 lc->optimal_buffer_level = 94 (int64_t)(oxcf->optimal_buffer_level * bitrate_alloc); 95 lc->maximum_buffer_size = 96 (int64_t)(oxcf->maximum_buffer_size * bitrate_alloc); 97 lrc->bits_off_target = MIN(lrc->bits_off_target, lc->maximum_buffer_size); 98 lrc->buffer_level = MIN(lrc->buffer_level, lc->maximum_buffer_size); 99 // Update framerate-related quantities. 100 if (svc->number_temporal_layers > 1) { 101 lc->framerate = oxcf->framerate / oxcf->ts_rate_decimator[layer]; 102 } else { 103 lc->framerate = oxcf->framerate; 104 } 105 lrc->av_per_frame_bandwidth = (int)(lc->target_bandwidth / lc->framerate); 106 lrc->max_frame_bandwidth = rc->max_frame_bandwidth; 107 // Update qp-related quantities. 108 lrc->worst_quality = rc->worst_quality; 109 lrc->best_quality = rc->best_quality; 110 } 111 } 112 113 static LAYER_CONTEXT *get_layer_context(SVC *svc) { 114 return svc->number_temporal_layers > 1 ? 115 &svc->layer_context[svc->temporal_layer_id] : 116 &svc->layer_context[svc->spatial_layer_id]; 117 } 118 119 void vp9_update_temporal_layer_framerate(VP9_COMP *const cpi) { 120 SVC *const svc = &cpi->svc; 121 const VP9_CONFIG *const oxcf = &cpi->oxcf; 122 LAYER_CONTEXT *const lc = get_layer_context(svc); 123 RATE_CONTROL *const lrc = &lc->rc; 124 const int layer = svc->temporal_layer_id; 125 126 lc->framerate = oxcf->framerate / oxcf->ts_rate_decimator[layer]; 127 lrc->av_per_frame_bandwidth = (int)(lc->target_bandwidth / lc->framerate); 128 lrc->max_frame_bandwidth = cpi->rc.max_frame_bandwidth; 129 // Update the average layer frame size (non-cumulative per-frame-bw). 130 if (layer == 0) { 131 lc->avg_frame_size = lrc->av_per_frame_bandwidth; 132 } else { 133 const double prev_layer_framerate = 134 oxcf->framerate / oxcf->ts_rate_decimator[layer - 1]; 135 const int prev_layer_target_bandwidth = 136 oxcf->ts_target_bitrate[layer - 1] * 1000; 137 lc->avg_frame_size = 138 (int)((lc->target_bandwidth - prev_layer_target_bandwidth) / 139 (lc->framerate - prev_layer_framerate)); 140 } 141 } 142 143 void vp9_update_spatial_layer_framerate(VP9_COMP *const cpi, double framerate) { 144 const VP9_CONFIG *const oxcf = &cpi->oxcf; 145 LAYER_CONTEXT *const lc = get_layer_context(&cpi->svc); 146 RATE_CONTROL *const lrc = &lc->rc; 147 148 lc->framerate = framerate; 149 lrc->av_per_frame_bandwidth = (int)(lc->target_bandwidth / lc->framerate); 150 lrc->min_frame_bandwidth = (int)(lrc->av_per_frame_bandwidth * 151 oxcf->two_pass_vbrmin_section / 100); 152 lrc->max_frame_bandwidth = (int)(((int64_t)lrc->av_per_frame_bandwidth * 153 oxcf->two_pass_vbrmax_section) / 100); 154 lrc->max_gf_interval = 16; 155 156 lrc->static_scene_max_gf_interval = cpi->key_frame_frequency >> 1; 157 158 if (oxcf->play_alternate && oxcf->lag_in_frames) { 159 if (lrc->max_gf_interval > oxcf->lag_in_frames - 1) 160 lrc->max_gf_interval = oxcf->lag_in_frames - 1; 161 162 if (lrc->static_scene_max_gf_interval > oxcf->lag_in_frames - 1) 163 lrc->static_scene_max_gf_interval = oxcf->lag_in_frames - 1; 164 } 165 166 if (lrc->max_gf_interval > lrc->static_scene_max_gf_interval) 167 lrc->max_gf_interval = lrc->static_scene_max_gf_interval; 168 } 169 170 void vp9_restore_layer_context(VP9_COMP *const cpi) { 171 LAYER_CONTEXT *const lc = get_layer_context(&cpi->svc); 172 const int old_frame_since_key = cpi->rc.frames_since_key; 173 const int old_frame_to_key = cpi->rc.frames_to_key; 174 175 cpi->rc = lc->rc; 176 cpi->twopass = lc->twopass; 177 cpi->oxcf.target_bandwidth = lc->target_bandwidth; 178 cpi->oxcf.starting_buffer_level = lc->starting_buffer_level; 179 cpi->oxcf.optimal_buffer_level = lc->optimal_buffer_level; 180 cpi->oxcf.maximum_buffer_size = lc->maximum_buffer_size; 181 cpi->output_framerate = lc->framerate; 182 // Reset the frames_since_key and frames_to_key counters to their values 183 // before the layer restore. Keep these defined for the stream (not layer). 184 if (cpi->svc.number_temporal_layers > 1) { 185 cpi->rc.frames_since_key = old_frame_since_key; 186 cpi->rc.frames_to_key = old_frame_to_key; 187 } 188 } 189 190 void vp9_save_layer_context(VP9_COMP *const cpi) { 191 const VP9_CONFIG *const oxcf = &cpi->oxcf; 192 LAYER_CONTEXT *const lc = get_layer_context(&cpi->svc); 193 194 lc->rc = cpi->rc; 195 lc->twopass = cpi->twopass; 196 lc->target_bandwidth = (int)oxcf->target_bandwidth; 197 lc->starting_buffer_level = oxcf->starting_buffer_level; 198 lc->optimal_buffer_level = oxcf->optimal_buffer_level; 199 lc->maximum_buffer_size = oxcf->maximum_buffer_size; 200 lc->framerate = cpi->output_framerate; 201 } 202 203 void vp9_init_second_pass_spatial_svc(VP9_COMP *cpi) { 204 SVC *const svc = &cpi->svc; 205 int i; 206 207 for (i = 0; i < svc->number_spatial_layers; ++i) { 208 struct twopass_rc *const twopass = &svc->layer_context[i].twopass; 209 210 svc->spatial_layer_id = i; 211 vp9_init_second_pass(cpi); 212 213 twopass->total_stats.spatial_layer_id = i; 214 twopass->total_left_stats.spatial_layer_id = i; 215 } 216 svc->spatial_layer_id = 0; 217 } 218 219 void vp9_inc_frame_in_layer(SVC *svc) { 220 LAYER_CONTEXT *const lc = (svc->number_temporal_layers > 1) 221 ? &svc->layer_context[svc->temporal_layer_id] 222 : &svc->layer_context[svc->spatial_layer_id]; 223 ++lc->current_video_frame_in_layer; 224 } 225
