caccf06acd
Added palette coding option for Y channel only, key frame only. Palette colors are obtained with k-means clustering algorithm. Run-length coding is used to compress the color indices. On screen_content: --enable-palette + 5.75% --enable-palette --enable-tx_skip +15.04% (was 13.3%) On derflr: --enable-palette - 0.03% with all the other expriments + 5.95% (was 5.98%) Change-Id: I6d1cf45c889be764d14083170fdf14a424bd31b5
122 lines
2.6 KiB
C
122 lines
2.6 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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#ifndef VP9_ENCODER_VP9_WRITER_H_
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#define VP9_ENCODER_VP9_WRITER_H_
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#include "vpx_ports/mem.h"
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#include "vp9/common/vp9_prob.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef struct {
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unsigned int lowvalue;
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unsigned int range;
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int count;
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unsigned int pos;
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uint8_t *buffer;
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} vp9_writer;
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void vp9_start_encode(vp9_writer *bc, uint8_t *buffer);
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void vp9_stop_encode(vp9_writer *bc);
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static INLINE void vp9_write(vp9_writer *br, int bit, int probability) {
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unsigned int split;
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int count = br->count;
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unsigned int range = br->range;
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unsigned int lowvalue = br->lowvalue;
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register unsigned int shift;
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split = 1 + (((range - 1) * probability) >> 8);
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range = split;
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if (bit) {
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lowvalue += split;
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range = br->range - split;
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}
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shift = vp9_norm[range];
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range <<= shift;
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count += shift;
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if (count >= 0) {
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int offset = shift - count;
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if ((lowvalue << (offset - 1)) & 0x80000000) {
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int x = br->pos - 1;
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while (x >= 0 && br->buffer[x] == 0xff) {
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br->buffer[x] = 0;
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x--;
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}
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br->buffer[x] += 1;
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}
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br->buffer[br->pos++] = (lowvalue >> (24 - offset));
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lowvalue <<= offset;
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shift = count;
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lowvalue &= 0xffffff;
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count -= 8;
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}
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lowvalue <<= shift;
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br->count = count;
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br->lowvalue = lowvalue;
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br->range = range;
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}
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static INLINE void vp9_write_bit(vp9_writer *w, int bit) {
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vp9_write(w, bit, 128); // vp9_prob_half
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}
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static INLINE void vp9_write_literal(vp9_writer *w, int data, int bits) {
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int bit;
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for (bit = bits - 1; bit >= 0; bit--)
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vp9_write_bit(w, 1 & (data >> bit));
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}
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static INLINE void vp9_encode_uniform(vp9_writer *w, int n, int v) {
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int l = get_unsigned_bits(n);
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int m = (1 << l) - n;
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if (l == 0)
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return;
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if (v < m) {
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vp9_write_literal(w, v, l - 1);
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} else {
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vp9_write_literal(w, m + ((v - m) >> 1), l - 1);
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vp9_write_literal(w, (v - m) & 1, 1);
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}
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}
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static INLINE int vp9_encode_uniform_cost(int n, int v) {
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int l = get_unsigned_bits(n), m = (1 << l) - n;
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if (l == 0)
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return 0;
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if (v < m)
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return l - 1;
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else
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return l;
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}
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#define vp9_write_prob(w, v) vp9_write_literal((w), (v), 8)
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#ifdef __cplusplus
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} // extern "C"
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#endif
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#endif // VP9_ENCODER_VP9_WRITER_H_
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