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src/Source/LibWebP/src/enc/vp8enci.h  view on Meta::CPAN

// 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
  int y_stride_, uv_stride_;       // respective strides
  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_ and yuv_in_/out_*
  uint8_t yuv_left_mem_[17 + 16 + 16 + 8 + ALIGN_CST];     // memory for *_left_
  uint8_t yuv_mem_[3 * YUV_SIZE + PRED_SIZE + ALIGN_CST];  // memory for yuv_*
} 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(const int ctx, const int coeff_type,
                         int first, int last,
                         const int16_t* const coeffs,
                         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