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