520 lines
22 KiB
C++
520 lines
22 KiB
C++
// Copyright 2011 Google Inc. 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 COPYING 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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//
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// WebP encoder: internal header.
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//
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// Author: Skal (pascal.massimino@gmail.com)
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#ifndef WEBP_ENC_VP8ENCI_H_
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#define WEBP_ENC_VP8ENCI_H_
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#include <string.h> // for memcpy()
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#include "../dec/common_dec.h"
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#include "../dsp/dsp.h"
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#include "../utils/bit_writer_utils.h"
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#include "../utils/thread_utils.h"
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#include "../utils/utils.h"
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#include "../webp/encode.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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//------------------------------------------------------------------------------
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// Various defines and enums
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// version numbers
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#define ENC_MAJ_VERSION 0
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#define ENC_MIN_VERSION 6
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#define ENC_REV_VERSION 0
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enum { MAX_LF_LEVELS = 64, // Maximum loop filter level
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MAX_VARIABLE_LEVEL = 67, // last (inclusive) level with variable cost
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MAX_LEVEL = 2047 // max level (note: max codable is 2047 + 67)
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};
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typedef enum { // Rate-distortion optimization levels
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RD_OPT_NONE = 0, // no rd-opt
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RD_OPT_BASIC = 1, // basic scoring (no trellis)
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RD_OPT_TRELLIS = 2, // perform trellis-quant on the final decision only
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RD_OPT_TRELLIS_ALL = 3 // trellis-quant for every scoring (much slower)
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} VP8RDLevel;
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// YUV-cache parameters. Cache is 32-bytes wide (= one cacheline).
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// The original or reconstructed samples can be accessed using VP8Scan[].
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// The predicted blocks can be accessed using offsets to yuv_p_ and
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// the arrays VP8*ModeOffsets[].
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// * YUV Samples area (yuv_in_/yuv_out_/yuv_out2_)
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// (see VP8Scan[] for accessing the blocks, along with
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// Y_OFF_ENC/U_OFF_ENC/V_OFF_ENC):
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// +----+----+
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// Y_OFF_ENC |YYYY|UUVV|
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// U_OFF_ENC |YYYY|UUVV|
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// V_OFF_ENC |YYYY|....| <- 25% wasted U/V area
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// |YYYY|....|
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// +----+----+
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// * Prediction area ('yuv_p_', size = PRED_SIZE_ENC)
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// Intra16 predictions (16x16 block each, two per row):
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// |I16DC16|I16TM16|
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// |I16VE16|I16HE16|
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// Chroma U/V predictions (16x8 block each, two per row):
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// |C8DC8|C8TM8|
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// |C8VE8|C8HE8|
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// Intra 4x4 predictions (4x4 block each)
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// |I4DC4 I4TM4 I4VE4 I4HE4|I4RD4 I4VR4 I4LD4 I4VL4|
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// |I4HD4 I4HU4 I4TMP .....|.......................| <- ~31% wasted
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#define YUV_SIZE_ENC (BPS * 16)
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#define PRED_SIZE_ENC (32 * BPS + 16 * BPS + 8 * BPS) // I16+Chroma+I4 preds
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#define Y_OFF_ENC (0)
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#define U_OFF_ENC (16)
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#define V_OFF_ENC (16 + 8)
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extern const int VP8Scan[16]; // in quant.c
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extern const int VP8UVModeOffsets[4]; // in analyze.c
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extern const int VP8I16ModeOffsets[4];
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extern const int VP8I4ModeOffsets[NUM_BMODES];
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// Layout of prediction blocks
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// intra 16x16
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#define I16DC16 (0 * 16 * BPS)
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#define I16TM16 (I16DC16 + 16)
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#define I16VE16 (1 * 16 * BPS)
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#define I16HE16 (I16VE16 + 16)
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// chroma 8x8, two U/V blocks side by side (hence: 16x8 each)
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#define C8DC8 (2 * 16 * BPS)
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#define C8TM8 (C8DC8 + 1 * 16)
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#define C8VE8 (2 * 16 * BPS + 8 * BPS)
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#define C8HE8 (C8VE8 + 1 * 16)
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// intra 4x4
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#define I4DC4 (3 * 16 * BPS + 0)
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#define I4TM4 (I4DC4 + 4)
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#define I4VE4 (I4DC4 + 8)
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#define I4HE4 (I4DC4 + 12)
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#define I4RD4 (I4DC4 + 16)
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#define I4VR4 (I4DC4 + 20)
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#define I4LD4 (I4DC4 + 24)
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#define I4VL4 (I4DC4 + 28)
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#define I4HD4 (3 * 16 * BPS + 4 * BPS)
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#define I4HU4 (I4HD4 + 4)
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#define I4TMP (I4HD4 + 8)
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typedef int64_t score_t; // type used for scores, rate, distortion
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// Note that MAX_COST is not the maximum allowed by sizeof(score_t),
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// in order to allow overflowing computations.
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#define MAX_COST ((score_t)0x7fffffffffffffLL)
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#define QFIX 17
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#define BIAS(b) ((b) << (QFIX - 8))
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// Fun fact: this is the _only_ line where we're actually being lossy and
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// discarding bits.
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static WEBP_INLINE int QUANTDIV(uint32_t n, uint32_t iQ, uint32_t B) {
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return (int)((n * iQ + B) >> QFIX);
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}
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// Uncomment the following to remove token-buffer code:
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// #define DISABLE_TOKEN_BUFFER
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//------------------------------------------------------------------------------
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// Headers
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typedef uint32_t proba_t; // 16b + 16b
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typedef uint8_t ProbaArray[NUM_CTX][NUM_PROBAS];
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typedef proba_t StatsArray[NUM_CTX][NUM_PROBAS];
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typedef uint16_t CostArray[NUM_CTX][MAX_VARIABLE_LEVEL + 1];
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typedef const uint16_t* (*CostArrayPtr)[NUM_CTX]; // for easy casting
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typedef const uint16_t* CostArrayMap[16][NUM_CTX];
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typedef double LFStats[NUM_MB_SEGMENTS][MAX_LF_LEVELS]; // filter stats
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typedef struct VP8Encoder VP8Encoder;
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// segment features
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typedef struct {
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int num_segments_; // Actual number of segments. 1 segment only = unused.
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int update_map_; // whether to update the segment map or not.
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// must be 0 if there's only 1 segment.
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int size_; // bit-cost for transmitting the segment map
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} VP8EncSegmentHeader;
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// Struct collecting all frame-persistent probabilities.
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typedef struct {
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uint8_t segments_[3]; // probabilities for segment tree
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uint8_t skip_proba_; // final probability of being skipped.
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ProbaArray coeffs_[NUM_TYPES][NUM_BANDS]; // 1056 bytes
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StatsArray stats_[NUM_TYPES][NUM_BANDS]; // 4224 bytes
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CostArray level_cost_[NUM_TYPES][NUM_BANDS]; // 13056 bytes
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CostArrayMap remapped_costs_[NUM_TYPES]; // 1536 bytes
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int dirty_; // if true, need to call VP8CalculateLevelCosts()
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int use_skip_proba_; // Note: we always use skip_proba for now.
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int nb_skip_; // number of skipped blocks
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} VP8EncProba;
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// Filter parameters. Not actually used in the code (we don't perform
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// the in-loop filtering), but filled from user's config
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typedef struct {
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int simple_; // filtering type: 0=complex, 1=simple
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int level_; // base filter level [0..63]
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int sharpness_; // [0..7]
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int i4x4_lf_delta_; // delta filter level for i4x4 relative to i16x16
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} VP8EncFilterHeader;
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//------------------------------------------------------------------------------
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// Informations about the macroblocks.
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typedef struct {
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// block type
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unsigned int type_:2; // 0=i4x4, 1=i16x16
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unsigned int uv_mode_:2;
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unsigned int skip_:1;
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unsigned int segment_:2;
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uint8_t alpha_; // quantization-susceptibility
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} VP8MBInfo;
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typedef struct VP8Matrix {
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uint16_t q_[16]; // quantizer steps
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uint16_t iq_[16]; // reciprocals, fixed point.
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uint32_t bias_[16]; // rounding bias
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uint32_t zthresh_[16]; // value below which a coefficient is zeroed
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uint16_t sharpen_[16]; // frequency boosters for slight sharpening
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} VP8Matrix;
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typedef struct {
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VP8Matrix y1_, y2_, uv_; // quantization matrices
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int alpha_; // quant-susceptibility, range [-127,127]. Zero is neutral.
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// Lower values indicate a lower risk of blurriness.
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int beta_; // filter-susceptibility, range [0,255].
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int quant_; // final segment quantizer.
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int fstrength_; // final in-loop filtering strength
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int max_edge_; // max edge delta (for filtering strength)
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int min_disto_; // minimum distortion required to trigger filtering record
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// reactivities
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int lambda_i16_, lambda_i4_, lambda_uv_;
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int lambda_mode_, lambda_trellis_, tlambda_;
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int lambda_trellis_i16_, lambda_trellis_i4_, lambda_trellis_uv_;
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// lambda values for distortion-based evaluation
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score_t i4_penalty_; // penalty for using Intra4
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} VP8SegmentInfo;
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// Handy transient struct to accumulate score and info during RD-optimization
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// and mode evaluation.
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typedef struct {
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score_t D, SD; // Distortion, spectral distortion
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score_t H, R, score; // header bits, rate, score.
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int16_t y_dc_levels[16]; // Quantized levels for luma-DC, luma-AC, chroma.
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int16_t y_ac_levels[16][16];
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int16_t uv_levels[4 + 4][16];
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int mode_i16; // mode number for intra16 prediction
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uint8_t modes_i4[16]; // mode numbers for intra4 predictions
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int mode_uv; // mode number of chroma prediction
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uint32_t nz; // non-zero blocks
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} VP8ModeScore;
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// Iterator structure to iterate through macroblocks, pointing to the
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// right neighbouring data (samples, predictions, contexts, ...)
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typedef struct {
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int x_, y_; // current macroblock
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uint8_t* yuv_in_; // input samples
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uint8_t* yuv_out_; // output samples
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uint8_t* yuv_out2_; // secondary buffer swapped with yuv_out_.
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uint8_t* yuv_p_; // scratch buffer for prediction
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VP8Encoder* enc_; // back-pointer
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VP8MBInfo* mb_; // current macroblock
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VP8BitWriter* bw_; // current bit-writer
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uint8_t* preds_; // intra mode predictors (4x4 blocks)
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uint32_t* nz_; // non-zero pattern
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uint8_t i4_boundary_[37]; // 32+5 boundary samples needed by intra4x4
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uint8_t* i4_top_; // pointer to the current top boundary sample
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int i4_; // current intra4x4 mode being tested
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int top_nz_[9]; // top-non-zero context.
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int left_nz_[9]; // left-non-zero. left_nz[8] is independent.
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uint64_t bit_count_[4][3]; // bit counters for coded levels.
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uint64_t luma_bits_; // macroblock bit-cost for luma
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uint64_t uv_bits_; // macroblock bit-cost for chroma
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LFStats* lf_stats_; // filter stats (borrowed from enc_)
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int do_trellis_; // if true, perform extra level optimisation
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int count_down_; // number of mb still to be processed
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int count_down0_; // starting counter value (for progress)
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int percent0_; // saved initial progress percent
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uint8_t* y_left_; // left luma samples (addressable from index -1 to 15).
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uint8_t* u_left_; // left u samples (addressable from index -1 to 7)
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uint8_t* v_left_; // left v samples (addressable from index -1 to 7)
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uint8_t* y_top_; // top luma samples at position 'x_'
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uint8_t* uv_top_; // top u/v samples at position 'x_', packed as 16 bytes
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// memory for storing y/u/v_left_
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uint8_t yuv_left_mem_[17 + 16 + 16 + 8 + WEBP_ALIGN_CST];
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// memory for yuv_*
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uint8_t yuv_mem_[3 * YUV_SIZE_ENC + PRED_SIZE_ENC + WEBP_ALIGN_CST];
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} VP8EncIterator;
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// in iterator.c
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// must be called first
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void VP8IteratorInit(VP8Encoder* const enc, VP8EncIterator* const it);
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// restart a scan
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void VP8IteratorReset(VP8EncIterator* const it);
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// reset iterator position to row 'y'
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void VP8IteratorSetRow(VP8EncIterator* const it, int y);
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// set count down (=number of iterations to go)
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void VP8IteratorSetCountDown(VP8EncIterator* const it, int count_down);
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// return true if iteration is finished
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int VP8IteratorIsDone(const VP8EncIterator* const it);
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// Import uncompressed samples from source.
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// If tmp_32 is not NULL, import boundary samples too.
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// tmp_32 is a 32-bytes scratch buffer that must be aligned in memory.
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void VP8IteratorImport(VP8EncIterator* const it, uint8_t* tmp_32);
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// export decimated samples
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void VP8IteratorExport(const VP8EncIterator* const it);
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// go to next macroblock. Returns false if not finished.
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int VP8IteratorNext(VP8EncIterator* const it);
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// save the yuv_out_ boundary values to top_/left_ arrays for next iterations.
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void VP8IteratorSaveBoundary(VP8EncIterator* const it);
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// Report progression based on macroblock rows. Return 0 for user-abort request.
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int VP8IteratorProgress(const VP8EncIterator* const it,
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int final_delta_percent);
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// Intra4x4 iterations
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void VP8IteratorStartI4(VP8EncIterator* const it);
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// returns true if not done.
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int VP8IteratorRotateI4(VP8EncIterator* const it,
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const uint8_t* const yuv_out);
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// Non-zero context setup/teardown
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void VP8IteratorNzToBytes(VP8EncIterator* const it);
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void VP8IteratorBytesToNz(VP8EncIterator* const it);
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// Helper functions to set mode properties
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void VP8SetIntra16Mode(const VP8EncIterator* const it, int mode);
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void VP8SetIntra4Mode(const VP8EncIterator* const it, const uint8_t* modes);
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void VP8SetIntraUVMode(const VP8EncIterator* const it, int mode);
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void VP8SetSkip(const VP8EncIterator* const it, int skip);
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void VP8SetSegment(const VP8EncIterator* const it, int segment);
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//------------------------------------------------------------------------------
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// Paginated token buffer
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typedef struct VP8Tokens VP8Tokens; // struct details in token.c
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typedef struct {
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#if !defined(DISABLE_TOKEN_BUFFER)
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VP8Tokens* pages_; // first page
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VP8Tokens** last_page_; // last page
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uint16_t* tokens_; // set to (*last_page_)->tokens_
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int left_; // how many free tokens left before the page is full
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int page_size_; // number of tokens per page
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#endif
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int error_; // true in case of malloc error
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} VP8TBuffer;
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// initialize an empty buffer
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void VP8TBufferInit(VP8TBuffer* const b, int page_size);
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void VP8TBufferClear(VP8TBuffer* const b); // de-allocate pages memory
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#if !defined(DISABLE_TOKEN_BUFFER)
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// Finalizes bitstream when probabilities are known.
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// Deletes the allocated token memory if final_pass is true.
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int VP8EmitTokens(VP8TBuffer* const b, VP8BitWriter* const bw,
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const uint8_t* const probas, int final_pass);
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// record the coding of coefficients without knowing the probabilities yet
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int VP8RecordCoeffTokens(int ctx, const struct VP8Residual* const res,
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VP8TBuffer* const tokens);
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// Estimate the final coded size given a set of 'probas'.
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size_t VP8EstimateTokenSize(VP8TBuffer* const b, const uint8_t* const probas);
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// unused for now
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void VP8TokenToStats(const VP8TBuffer* const b, proba_t* const stats);
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#endif // !DISABLE_TOKEN_BUFFER
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//------------------------------------------------------------------------------
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// VP8Encoder
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struct VP8Encoder {
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const WebPConfig* config_; // user configuration and parameters
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WebPPicture* pic_; // input / output picture
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// headers
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VP8EncFilterHeader filter_hdr_; // filtering information
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VP8EncSegmentHeader segment_hdr_; // segment information
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int profile_; // VP8's profile, deduced from Config.
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// dimension, in macroblock units.
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int mb_w_, mb_h_;
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int preds_w_; // stride of the *preds_ prediction plane (=4*mb_w + 1)
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// number of partitions (1, 2, 4 or 8 = MAX_NUM_PARTITIONS)
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int num_parts_;
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// per-partition boolean decoders.
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VP8BitWriter bw_; // part0
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VP8BitWriter parts_[MAX_NUM_PARTITIONS]; // token partitions
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VP8TBuffer tokens_; // token buffer
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int percent_; // for progress
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// transparency blob
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int has_alpha_;
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uint8_t* alpha_data_; // non-NULL if transparency is present
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uint32_t alpha_data_size_;
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WebPWorker alpha_worker_;
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// quantization info (one set of DC/AC dequant factor per segment)
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VP8SegmentInfo dqm_[NUM_MB_SEGMENTS];
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int base_quant_; // nominal quantizer value. Only used
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// for relative coding of segments' quant.
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int alpha_; // global susceptibility (<=> complexity)
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int uv_alpha_; // U/V quantization susceptibility
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// global offset of quantizers, shared by all segments
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int dq_y1_dc_;
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int dq_y2_dc_, dq_y2_ac_;
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int dq_uv_dc_, dq_uv_ac_;
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// probabilities and statistics
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VP8EncProba proba_;
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uint64_t sse_[4]; // sum of Y/U/V/A squared errors for all macroblocks
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uint64_t sse_count_; // pixel count for the sse_[] stats
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int coded_size_;
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int residual_bytes_[3][4];
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int block_count_[3];
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// quality/speed settings
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int method_; // 0=fastest, 6=best/slowest.
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VP8RDLevel rd_opt_level_; // Deduced from method_.
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int max_i4_header_bits_; // partition #0 safeness factor
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int mb_header_limit_; // rough limit for header bits per MB
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int thread_level_; // derived from config->thread_level
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int do_search_; // derived from config->target_XXX
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int use_tokens_; // if true, use token buffer
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// Memory
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VP8MBInfo* mb_info_; // contextual macroblock infos (mb_w_ + 1)
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uint8_t* preds_; // predictions modes: (4*mb_w+1) * (4*mb_h+1)
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uint32_t* nz_; // non-zero bit context: mb_w+1
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uint8_t* y_top_; // top luma samples.
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uint8_t* uv_top_; // top u/v samples.
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// U and V are packed into 16 bytes (8 U + 8 V)
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LFStats* lf_stats_; // autofilter stats (if NULL, autofilter is off)
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};
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//------------------------------------------------------------------------------
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// internal functions. Not public.
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// in tree.c
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extern const uint8_t VP8CoeffsProba0[NUM_TYPES][NUM_BANDS][NUM_CTX][NUM_PROBAS];
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extern const uint8_t
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VP8CoeffsUpdateProba[NUM_TYPES][NUM_BANDS][NUM_CTX][NUM_PROBAS];
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// Reset the token probabilities to their initial (default) values
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void VP8DefaultProbas(VP8Encoder* const enc);
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// Write the token probabilities
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void VP8WriteProbas(VP8BitWriter* const bw, const VP8EncProba* const probas);
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// Writes the partition #0 modes (that is: all intra modes)
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void VP8CodeIntraModes(VP8Encoder* const enc);
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// in syntax.c
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// Generates the final bitstream by coding the partition0 and headers,
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// and appending an assembly of all the pre-coded token partitions.
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// Return true if everything is ok.
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int VP8EncWrite(VP8Encoder* const enc);
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// Release memory allocated for bit-writing in VP8EncLoop & seq.
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void VP8EncFreeBitWriters(VP8Encoder* const enc);
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// in frame.c
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extern const uint8_t VP8Cat3[];
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extern const uint8_t VP8Cat4[];
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extern const uint8_t VP8Cat5[];
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extern const uint8_t VP8Cat6[];
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// Form all the four Intra16x16 predictions in the yuv_p_ cache
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void VP8MakeLuma16Preds(const VP8EncIterator* const it);
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// Form all the four Chroma8x8 predictions in the yuv_p_ cache
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void VP8MakeChroma8Preds(const VP8EncIterator* const it);
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// Form all the ten Intra4x4 predictions in the yuv_p_ cache
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// for the 4x4 block it->i4_
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void VP8MakeIntra4Preds(const VP8EncIterator* const it);
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// Rate calculation
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int VP8GetCostLuma16(VP8EncIterator* const it, const VP8ModeScore* const rd);
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int VP8GetCostLuma4(VP8EncIterator* const it, const int16_t levels[16]);
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int VP8GetCostUV(VP8EncIterator* const it, const VP8ModeScore* const rd);
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// Main coding calls
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int VP8EncLoop(VP8Encoder* const enc);
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int VP8EncTokenLoop(VP8Encoder* const enc);
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// in webpenc.c
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// Assign an error code to a picture. Return false for convenience.
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int WebPEncodingSetError(const WebPPicture* const pic, WebPEncodingError error);
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int WebPReportProgress(const WebPPicture* const pic,
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int percent, int* const percent_store);
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// in analysis.c
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// Main analysis loop. Decides the segmentations and complexity.
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// Assigns a first guess for Intra16 and uvmode_ prediction modes.
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int VP8EncAnalyze(VP8Encoder* const enc);
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// in quant.c
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// Sets up segment's quantization values, base_quant_ and filter strengths.
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void VP8SetSegmentParams(VP8Encoder* const enc, float quality);
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// Pick best modes and fills the levels. Returns true if skipped.
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int VP8Decimate(VP8EncIterator* const it, VP8ModeScore* const rd,
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VP8RDLevel rd_opt);
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// in alpha.c
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void VP8EncInitAlpha(VP8Encoder* const enc); // initialize alpha compression
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int VP8EncStartAlpha(VP8Encoder* const enc); // start alpha coding process
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int VP8EncFinishAlpha(VP8Encoder* const enc); // finalize compressed data
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int VP8EncDeleteAlpha(VP8Encoder* const enc); // delete compressed data
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// autofilter
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void VP8InitFilter(VP8EncIterator* const it);
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void VP8StoreFilterStats(VP8EncIterator* const it);
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void VP8AdjustFilterStrength(VP8EncIterator* const it);
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// returns the approximate filtering strength needed to smooth a edge
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// step of 'delta', given a sharpness parameter 'sharpness'.
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int VP8FilterStrengthFromDelta(int sharpness, int delta);
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// misc utils for picture_*.c:
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// Remove reference to the ARGB/YUVA buffer (doesn't free anything).
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void WebPPictureResetBuffers(WebPPicture* const picture);
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// Allocates ARGB buffer of given dimension (previous one is always free'd).
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// Preserves the YUV(A) buffer. Returns false in case of error (invalid param,
|
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// out-of-memory).
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int WebPPictureAllocARGB(WebPPicture* const picture, int width, int height);
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// Allocates YUVA buffer of given dimension (previous one is always free'd).
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// Uses picture->csp to determine whether an alpha buffer is needed.
|
|
// Preserves the ARGB buffer.
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// Returns false in case of error (invalid param, out-of-memory).
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int WebPPictureAllocYUVA(WebPPicture* const picture, int width, int height);
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// Clean-up the RGB samples under fully transparent area, to help lossless
|
|
// compressibility (no guarantee, though). Assumes that pic->use_argb is true.
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void WebPCleanupTransparentAreaLossless(WebPPicture* const pic);
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// in near_lossless.c
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// Near lossless preprocessing in RGB color-space.
|
|
int VP8ApplyNearLossless(int xsize, int ysize, uint32_t* argb, int quality);
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|
// Near lossless adjustment for predictors.
|
|
void VP8ApplyNearLosslessPredict(int xsize, int ysize, int pred_bits,
|
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const uint32_t* argb_orig,
|
|
uint32_t* argb, uint32_t* argb_scratch,
|
|
const uint32_t* const transform_data,
|
|
int quality, int subtract_green);
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|
//------------------------------------------------------------------------------
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|
|
|
#ifdef __cplusplus
|
|
} // extern "C"
|
|
#endif
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#endif /* WEBP_ENC_VP8ENCI_H_ */
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