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/*
* Copyright (c) 2014 The WebM 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.
*/
#include <math.h>
#include "vp9/encoder/vp9_onyx_int.h"
#include "vp9/encoder/vp9_svc_layercontext.h"
void vp9_init_layer_context(VP9_COMP *const cpi) {
const VP9_CONFIG *const oxcf = &cpi->oxcf;
int layer;
cpi->svc.spatial_layer_id = 0;
cpi->svc.temporal_layer_id = 0;
for (layer = 0; layer < cpi->svc.number_temporal_layers; ++layer) {
LAYER_CONTEXT *const lc = &cpi->svc.layer_context[layer];
RATE_CONTROL *const lrc = &lc->rc;
lrc->avg_frame_qindex[INTER_FRAME] = q_trans[oxcf->worst_allowed_q];
lrc->last_q[INTER_FRAME] = q_trans[oxcf->worst_allowed_q];
lrc->ni_av_qi = q_trans[oxcf->worst_allowed_q];
lrc->total_actual_bits = 0;
lrc->total_target_vs_actual = 0;
lrc->ni_tot_qi = 0;
lrc->tot_q = 0.0;
lrc->avg_q = 0.0;
lrc->ni_frames = 0;
lrc->decimation_count = 0;
lrc->decimation_factor = 0;
lrc->rate_correction_factor = 1.0;
lrc->key_frame_rate_correction_factor = 1.0;
lc->target_bandwidth = oxcf->ts_target_bitrate[layer] * 1000;
lrc->buffer_level = vp9_rescale((int)(oxcf->starting_buffer_level),
lc->target_bandwidth, 1000);
lrc->bits_off_target = lrc->buffer_level;
}
}
// Update the layer context from a change_config() call.
void vp9_update_layer_context_change_config(VP9_COMP *const cpi,
const int target_bandwidth) {
const VP9_CONFIG *const oxcf = &cpi->oxcf;
const RATE_CONTROL *const rc = &cpi->rc;
int layer;
float bitrate_alloc = 1.0;
for (layer = 0; layer < cpi->svc.number_temporal_layers; ++layer) {
LAYER_CONTEXT *const lc = &cpi->svc.layer_context[layer];
RATE_CONTROL *const lrc = &lc->rc;
lc->target_bandwidth = oxcf->ts_target_bitrate[layer] * 1000;
bitrate_alloc = (float)lc->target_bandwidth / target_bandwidth;
// Update buffer-related quantities.
lc->starting_buffer_level =
(int64_t)(oxcf->starting_buffer_level * bitrate_alloc);
lc->optimal_buffer_level =
(int64_t)(oxcf->optimal_buffer_level * bitrate_alloc);
lc->maximum_buffer_size =
(int64_t)(oxcf->maximum_buffer_size * bitrate_alloc);
lrc->bits_off_target = MIN(lrc->bits_off_target, lc->maximum_buffer_size);
lrc->buffer_level = MIN(lrc->buffer_level, lc->maximum_buffer_size);
// Update framerate-related quantities.
lc->framerate = oxcf->framerate / oxcf->ts_rate_decimator[layer];
lrc->av_per_frame_bandwidth = (int)(lc->target_bandwidth / lc->framerate);
lrc->max_frame_bandwidth = rc->max_frame_bandwidth;
// Update qp-related quantities.
lrc->worst_quality = rc->worst_quality;
lrc->best_quality = rc->best_quality;
}
}
static LAYER_CONTEXT *get_temporal_layer_context(SVC *svc) {
return &svc->layer_context[svc->temporal_layer_id];
}
void vp9_update_layer_framerate(VP9_COMP *const cpi) {
const int layer = cpi->svc.temporal_layer_id;
const VP9_CONFIG *const oxcf = &cpi->oxcf;
LAYER_CONTEXT *const lc = get_temporal_layer_context(&cpi->svc);
RATE_CONTROL *const lrc = &lc->rc;
lc->framerate = oxcf->framerate / oxcf->ts_rate_decimator[layer];
lrc->av_per_frame_bandwidth = (int)(lc->target_bandwidth / lc->framerate);
lrc->max_frame_bandwidth = cpi->rc.max_frame_bandwidth;
// Update the average layer frame size (non-cumulative per-frame-bw).
if (layer == 0) {
lc->avg_frame_size = lrc->av_per_frame_bandwidth;
} else {
const double prev_layer_framerate =
oxcf->framerate / oxcf->ts_rate_decimator[layer - 1];
const int prev_layer_target_bandwidth =
oxcf->ts_target_bitrate[layer - 1] * 1000;
lc->avg_frame_size =
(int)((lc->target_bandwidth - prev_layer_target_bandwidth) /
(lc->framerate - prev_layer_framerate));
}
}
void vp9_restore_layer_context(VP9_COMP *const cpi) {
LAYER_CONTEXT *const lc = get_temporal_layer_context(&cpi->svc);
const int old_frame_since_key = cpi->rc.frames_since_key;
const int old_frame_to_key = cpi->rc.frames_to_key;
cpi->rc = lc->rc;
cpi->oxcf.target_bandwidth = lc->target_bandwidth;
cpi->oxcf.starting_buffer_level = lc->starting_buffer_level;
cpi->oxcf.optimal_buffer_level = lc->optimal_buffer_level;
cpi->oxcf.maximum_buffer_size = lc->maximum_buffer_size;
cpi->output_framerate = lc->framerate;
// Reset the frames_since_key and frames_to_key counters to their values
// before the layer restore. Keep these defined for the stream (not layer).
cpi->rc.frames_since_key = old_frame_since_key;
cpi->rc.frames_to_key = old_frame_to_key;
}
void vp9_save_layer_context(VP9_COMP *const cpi) {
const VP9_CONFIG *const oxcf = &cpi->oxcf;
LAYER_CONTEXT *const lc = get_temporal_layer_context(&cpi->svc);
lc->rc = cpi->rc;
lc->target_bandwidth = (int)oxcf->target_bandwidth;
lc->starting_buffer_level = oxcf->starting_buffer_level;
lc->optimal_buffer_level = oxcf->optimal_buffer_level;
lc->maximum_buffer_size = oxcf->maximum_buffer_size;
lc->framerate = cpi->output_framerate;
}
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