faff6ed0fb
This speed feature allows the encoder to largely remove the spatial
dependency between blocks inside a 64x64 superblock, thereby removing
the need to repeatedly encode superblocks per partition type in the
rate-distortion optimization loop.
A major challenge lies in the intra modes tested in the rate-distortion
optimization loop. The subsequent blocks do not have access to the
reconstructed boundary pixels without the intermediate coding steps.
This was resolved by using the original pixels for intra prediction
in the rd loop, followed by an appropriately designed distortion
modeling on the quantization parameters. Experiments also suggested
that the performance impact is more discernible at lower bit-rate/psnr
settings. Hence a quantizer dependent threshold is applied to deactivate
skip of block coding.
For bus_cif at 2000 kbps,
speed 0: runtime 269854ms -> 237774ms (12% speed-up) at 0.05dB
performance loss.
speed 1: runtime 65312ms -> 61536ms, (7% speed-up) at 0.04dB
performance loss.
This operation is currently turned on in settings of speed 1.
Change-Id: Ib689741dfff8dd38365d8c1b92860a3e176f56ec
29 lines
1.1 KiB
C
29 lines
1.1 KiB
C
/*
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* Copyright (c) 2010 The WebM project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "./vpx_config.h"
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#include "vp9_rtcd.h"
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#include "vp9/encoder/vp9_quantize.h"
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#include "vp9/common/vp9_reconintra.h"
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#include "vp9/encoder/vp9_encodemb.h"
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#include "vp9/encoder/vp9_encodeintra.h"
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int vp9_encode_intra(VP9_COMP *cpi, MACROBLOCK *x, int use_16x16_pred) {
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MB_MODE_INFO * mbmi = &x->e_mbd.mode_info_context->mbmi;
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(void) cpi;
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x->skip_encode = 0;
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mbmi->mode = DC_PRED;
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mbmi->ref_frame[0] = INTRA_FRAME;
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mbmi->txfm_size = use_16x16_pred ? (mbmi->sb_type >= BLOCK_SIZE_MB16X16 ?
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TX_16X16 : TX_8X8) : TX_4X4;
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vp9_encode_intra_block_y(&cpi->common, x, mbmi->sb_type);
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return vp9_get_mb_ss(x->plane[0].src_diff);
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}
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