336 lines
11 KiB
C
336 lines
11 KiB
C
// Copyright 2010 Google Inc. All Rights Reserved.
|
|
//
|
|
// This code is licensed under the same terms as WebM:
|
|
// Software License Agreement: http://www.webmproject.org/license/software/
|
|
// Additional IP Rights Grant: http://www.webmproject.org/license/additional/
|
|
// -----------------------------------------------------------------------------
|
|
//
|
|
// VP8 decoder: internal header.
|
|
//
|
|
// Author: Skal (pascal.massimino@gmail.com)
|
|
|
|
#ifndef WEBP_DEC_VP8I_H_
|
|
#define WEBP_DEC_VP8I_H_
|
|
|
|
#include <string.h> // for memcpy()
|
|
#include "./vp8li.h"
|
|
#include "../utils/bit_reader.h"
|
|
#include "../utils/thread.h"
|
|
#include "../dsp/dsp.h"
|
|
|
|
#if defined(__cplusplus) || defined(c_plusplus)
|
|
extern "C" {
|
|
#endif
|
|
|
|
//------------------------------------------------------------------------------
|
|
// Various defines and enums
|
|
|
|
// version numbers
|
|
#define DEC_MAJ_VERSION 0
|
|
#define DEC_MIN_VERSION 2
|
|
#define DEC_REV_VERSION 0
|
|
|
|
#define ONLY_KEYFRAME_CODE // to remove any code related to P-Frames
|
|
|
|
// intra prediction modes
|
|
enum { B_DC_PRED = 0, // 4x4 modes
|
|
B_TM_PRED,
|
|
B_VE_PRED,
|
|
B_HE_PRED,
|
|
B_RD_PRED,
|
|
B_VR_PRED,
|
|
B_LD_PRED,
|
|
B_VL_PRED,
|
|
B_HD_PRED,
|
|
B_HU_PRED,
|
|
NUM_BMODES = B_HU_PRED + 1 - B_DC_PRED, // = 10
|
|
|
|
// Luma16 or UV modes
|
|
DC_PRED = B_DC_PRED, V_PRED = B_VE_PRED,
|
|
H_PRED = B_HE_PRED, TM_PRED = B_TM_PRED,
|
|
B_PRED = NUM_BMODES, // refined I4x4 mode
|
|
|
|
// special modes
|
|
B_DC_PRED_NOTOP = 4,
|
|
B_DC_PRED_NOLEFT = 5,
|
|
B_DC_PRED_NOTOPLEFT = 6,
|
|
NUM_B_DC_MODES = 7 };
|
|
|
|
enum { MB_FEATURE_TREE_PROBS = 3,
|
|
NUM_MB_SEGMENTS = 4,
|
|
NUM_REF_LF_DELTAS = 4,
|
|
NUM_MODE_LF_DELTAS = 4, // I4x4, ZERO, *, SPLIT
|
|
MAX_NUM_PARTITIONS = 8,
|
|
// Probabilities
|
|
NUM_TYPES = 4,
|
|
NUM_BANDS = 8,
|
|
NUM_CTX = 3,
|
|
NUM_PROBAS = 11,
|
|
NUM_MV_PROBAS = 19 };
|
|
|
|
// YUV-cache parameters.
|
|
// Constraints are: We need to store one 16x16 block of luma samples (y),
|
|
// and two 8x8 chroma blocks (u/v). These are better be 16-bytes aligned,
|
|
// in order to be SIMD-friendly. We also need to store the top, left and
|
|
// top-left samples (from previously decoded blocks), along with four
|
|
// extra top-right samples for luma (intra4x4 prediction only).
|
|
// One possible layout is, using 32 * (17 + 9) bytes:
|
|
//
|
|
// .+------ <- only 1 pixel high
|
|
// .|yyyyt.
|
|
// .|yyyyt.
|
|
// .|yyyyt.
|
|
// .|yyyy..
|
|
// .+--.+-- <- only 1 pixel high
|
|
// .|uu.|vv
|
|
// .|uu.|vv
|
|
//
|
|
// Every character is a 4x4 block, with legend:
|
|
// '.' = unused
|
|
// 'y' = y-samples 'u' = u-samples 'v' = u-samples
|
|
// '|' = left sample, '-' = top sample, '+' = top-left sample
|
|
// 't' = extra top-right sample for 4x4 modes
|
|
// With this layout, BPS (=Bytes Per Scan-line) is one cacheline size.
|
|
#define BPS 32 // this is the common stride used by yuv[]
|
|
#define YUV_SIZE (BPS * 17 + BPS * 9)
|
|
#define Y_SIZE (BPS * 17)
|
|
#define Y_OFF (BPS * 1 + 8)
|
|
#define U_OFF (Y_OFF + BPS * 16 + BPS)
|
|
#define V_OFF (U_OFF + 16)
|
|
|
|
//------------------------------------------------------------------------------
|
|
// Headers
|
|
|
|
typedef struct {
|
|
uint8_t key_frame_;
|
|
uint8_t profile_;
|
|
uint8_t show_;
|
|
uint32_t partition_length_;
|
|
} VP8FrameHeader;
|
|
|
|
typedef struct {
|
|
uint16_t width_;
|
|
uint16_t height_;
|
|
uint8_t xscale_;
|
|
uint8_t yscale_;
|
|
uint8_t colorspace_; // 0 = YCbCr
|
|
uint8_t clamp_type_;
|
|
} VP8PictureHeader;
|
|
|
|
// segment features
|
|
typedef struct {
|
|
int use_segment_;
|
|
int update_map_; // whether to update the segment map or not
|
|
int absolute_delta_; // absolute or delta values for quantizer and filter
|
|
int8_t quantizer_[NUM_MB_SEGMENTS]; // quantization changes
|
|
int8_t filter_strength_[NUM_MB_SEGMENTS]; // filter strength for segments
|
|
} VP8SegmentHeader;
|
|
|
|
// Struct collecting all frame-persistent probabilities.
|
|
typedef struct {
|
|
uint8_t segments_[MB_FEATURE_TREE_PROBS];
|
|
// Type: 0:Intra16-AC 1:Intra16-DC 2:Chroma 3:Intra4
|
|
uint8_t coeffs_[NUM_TYPES][NUM_BANDS][NUM_CTX][NUM_PROBAS];
|
|
#ifndef ONLY_KEYFRAME_CODE
|
|
uint8_t ymode_[4], uvmode_[3];
|
|
uint8_t mv_[2][NUM_MV_PROBAS];
|
|
#endif
|
|
} VP8Proba;
|
|
|
|
// Filter parameters
|
|
typedef struct {
|
|
int simple_; // 0=complex, 1=simple
|
|
int level_; // [0..63]
|
|
int sharpness_; // [0..7]
|
|
int use_lf_delta_;
|
|
int ref_lf_delta_[NUM_REF_LF_DELTAS];
|
|
int mode_lf_delta_[NUM_MODE_LF_DELTAS];
|
|
} VP8FilterHeader;
|
|
|
|
//------------------------------------------------------------------------------
|
|
// Informations about the macroblocks.
|
|
|
|
typedef struct { // filter specs
|
|
unsigned int f_level_:6; // filter strength: 0..63
|
|
unsigned int f_ilevel_:6; // inner limit: 1..63
|
|
unsigned int f_inner_:1; // do inner filtering?
|
|
} VP8FInfo;
|
|
|
|
typedef struct { // used for syntax-parsing
|
|
unsigned int nz_; // non-zero AC/DC coeffs
|
|
unsigned int dc_nz_:1; // non-zero DC coeffs
|
|
unsigned int skip_:1; // block type
|
|
} VP8MB;
|
|
|
|
// Dequantization matrices
|
|
typedef int quant_t[2]; // [DC / AC]. Can be 'uint16_t[2]' too (~slower).
|
|
typedef struct {
|
|
quant_t y1_mat_, y2_mat_, uv_mat_;
|
|
} VP8QuantMatrix;
|
|
|
|
// Persistent information needed by the parallel processing
|
|
typedef struct {
|
|
int id_; // cache row to process (in [0..2])
|
|
int mb_y_; // macroblock position of the row
|
|
int filter_row_; // true if row-filtering is needed
|
|
VP8FInfo* f_info_; // filter strengths
|
|
VP8Io io_; // copy of the VP8Io to pass to put()
|
|
} VP8ThreadContext;
|
|
|
|
//------------------------------------------------------------------------------
|
|
// VP8Decoder: the main opaque structure handed over to user
|
|
|
|
struct VP8Decoder {
|
|
VP8StatusCode status_;
|
|
int ready_; // true if ready to decode a picture with VP8Decode()
|
|
const char* error_msg_; // set when status_ is not OK.
|
|
|
|
// Main data source
|
|
VP8BitReader br_;
|
|
|
|
// headers
|
|
VP8FrameHeader frm_hdr_;
|
|
VP8PictureHeader pic_hdr_;
|
|
VP8FilterHeader filter_hdr_;
|
|
VP8SegmentHeader segment_hdr_;
|
|
|
|
// Worker
|
|
WebPWorker worker_;
|
|
int use_threads_; // use multi-thread
|
|
int cache_id_; // current cache row
|
|
int num_caches_; // number of cached rows of 16 pixels (1, 2 or 3)
|
|
VP8ThreadContext thread_ctx_; // Thread context
|
|
|
|
// dimension, in macroblock units.
|
|
int mb_w_, mb_h_;
|
|
|
|
// Macroblock to process/filter, depending on cropping and filter_type.
|
|
int tl_mb_x_, tl_mb_y_; // top-left MB that must be in-loop filtered
|
|
int br_mb_x_, br_mb_y_; // last bottom-right MB that must be decoded
|
|
|
|
// number of partitions.
|
|
int num_parts_;
|
|
// per-partition boolean decoders.
|
|
VP8BitReader parts_[MAX_NUM_PARTITIONS];
|
|
|
|
// buffer refresh flags
|
|
// bit 0: refresh Gold, bit 1: refresh Alt
|
|
// bit 2-3: copy to Gold, bit 4-5: copy to Alt
|
|
// bit 6: Gold sign bias, bit 7: Alt sign bias
|
|
// bit 8: refresh last frame
|
|
uint32_t buffer_flags_;
|
|
|
|
// dequantization (one set of DC/AC dequant factor per segment)
|
|
VP8QuantMatrix dqm_[NUM_MB_SEGMENTS];
|
|
|
|
// probabilities
|
|
VP8Proba proba_;
|
|
int use_skip_proba_;
|
|
uint8_t skip_p_;
|
|
#ifndef ONLY_KEYFRAME_CODE
|
|
uint8_t intra_p_, last_p_, golden_p_;
|
|
VP8Proba proba_saved_;
|
|
int update_proba_;
|
|
#endif
|
|
|
|
// Boundary data cache and persistent buffers.
|
|
uint8_t* intra_t_; // top intra modes values: 4 * mb_w_
|
|
uint8_t intra_l_[4]; // left intra modes values
|
|
uint8_t* y_t_; // top luma samples: 16 * mb_w_
|
|
uint8_t* u_t_, *v_t_; // top u/v samples: 8 * mb_w_ each
|
|
|
|
VP8MB* mb_info_; // contextual macroblock info (mb_w_ + 1)
|
|
VP8FInfo* f_info_; // filter strength info
|
|
uint8_t* yuv_b_; // main block for Y/U/V (size = YUV_SIZE)
|
|
int16_t* coeffs_; // 384 coeffs = (16+8+8) * 4*4
|
|
|
|
uint8_t* cache_y_; // macroblock row for storing unfiltered samples
|
|
uint8_t* cache_u_;
|
|
uint8_t* cache_v_;
|
|
int cache_y_stride_;
|
|
int cache_uv_stride_;
|
|
|
|
// main memory chunk for the above data. Persistent.
|
|
void* mem_;
|
|
size_t mem_size_;
|
|
|
|
// Per macroblock non-persistent infos.
|
|
int mb_x_, mb_y_; // current position, in macroblock units
|
|
uint8_t is_i4x4_; // true if intra4x4
|
|
uint8_t imodes_[16]; // one 16x16 mode (#0) or sixteen 4x4 modes
|
|
uint8_t uvmode_; // chroma prediction mode
|
|
uint8_t segment_; // block's segment
|
|
|
|
// bit-wise info about the content of each sub-4x4 blocks: there are 16 bits
|
|
// for luma (bits #0->#15), then 4 bits for chroma-u (#16->#19) and 4 bits for
|
|
// chroma-v (#20->#23), each corresponding to one 4x4 block in decoding order.
|
|
// If the bit is set, the 4x4 block contains some non-zero coefficients.
|
|
uint32_t non_zero_;
|
|
uint32_t non_zero_ac_;
|
|
|
|
// Filtering side-info
|
|
int filter_type_; // 0=off, 1=simple, 2=complex
|
|
int filter_row_; // per-row flag
|
|
uint8_t filter_levels_[NUM_MB_SEGMENTS]; // precalculated per-segment
|
|
|
|
// extensions
|
|
const uint8_t* alpha_data_; // compressed alpha data (if present)
|
|
size_t alpha_data_size_;
|
|
uint8_t* alpha_plane_; // output. Persistent, contains the whole data.
|
|
|
|
int layer_colorspace_;
|
|
const uint8_t* layer_data_; // compressed layer data (if present)
|
|
size_t layer_data_size_;
|
|
};
|
|
|
|
//------------------------------------------------------------------------------
|
|
// internal functions. Not public.
|
|
|
|
// in vp8.c
|
|
int VP8SetError(VP8Decoder* const dec,
|
|
VP8StatusCode error, const char* const msg);
|
|
|
|
// in tree.c
|
|
void VP8ResetProba(VP8Proba* const proba);
|
|
void VP8ParseProba(VP8BitReader* const br, VP8Decoder* const dec);
|
|
void VP8ParseIntraMode(VP8BitReader* const br, VP8Decoder* const dec);
|
|
|
|
// in quant.c
|
|
void VP8ParseQuant(VP8Decoder* const dec);
|
|
|
|
// in frame.c
|
|
int VP8InitFrame(VP8Decoder* const dec, VP8Io* io);
|
|
// Predict a block and add residual
|
|
void VP8ReconstructBlock(VP8Decoder* const dec);
|
|
// Call io->setup() and finish setting up scan parameters.
|
|
// After this call returns, one must always call VP8ExitCritical() with the
|
|
// same parameters. Both functions should be used in pair. Returns VP8_STATUS_OK
|
|
// if ok, otherwise sets and returns the error status on *dec.
|
|
VP8StatusCode VP8EnterCritical(VP8Decoder* const dec, VP8Io* const io);
|
|
// Must always be called in pair with VP8EnterCritical().
|
|
// Returns false in case of error.
|
|
int VP8ExitCritical(VP8Decoder* const dec, VP8Io* const io);
|
|
// Process the last decoded row (filtering + output)
|
|
int VP8ProcessRow(VP8Decoder* const dec, VP8Io* const io);
|
|
// Store a block, along with filtering params
|
|
void VP8StoreBlock(VP8Decoder* const dec);
|
|
// To be called at the start of a new scanline, to initialize predictors.
|
|
void VP8InitScanline(VP8Decoder* const dec);
|
|
// Decode one macroblock. Returns false if there is not enough data.
|
|
int VP8DecodeMB(VP8Decoder* const dec, VP8BitReader* const token_br);
|
|
|
|
// in alpha.c
|
|
const uint8_t* VP8DecompressAlphaRows(VP8Decoder* const dec,
|
|
int row, int num_rows);
|
|
|
|
// in layer.c
|
|
int VP8DecodeLayer(VP8Decoder* const dec);
|
|
|
|
//------------------------------------------------------------------------------
|
|
|
|
#if defined(__cplusplus) || defined(c_plusplus)
|
|
} // extern "C"
|
|
#endif
|
|
|
|
#endif /* WEBP_DEC_VP8I_H_ */
|