Lines Matching refs:br
27 void VP8InitBitReader(VP8BitReader* const br,
29 assert(br != NULL);
32 br->range_ = MK(255 - 1);
33 br->buf_ = start;
34 br->buf_end_ = end;
35 br->value_ = 0;
36 br->bits_ = -8; // to load the very first 8bits
37 br->eof_ = 0;
74 void VP8LoadFinalBytes(VP8BitReader* const br) {
75 assert(br != NULL && br->buf_ != NULL);
77 if (br->buf_ < br->buf_end_) {
79 br->value_ |= (bit_t)(*br->buf_++) << ((BITS) - 8 - br->bits_);
81 br->value_ = (bit_t)(*br->buf_++) | (br->value_ << 8);
83 br->bits_ += 8;
84 } else if (!br->eof_) {
88 br->value_ <<= 8;
89 br->bits_ += 8;
91 br->eof_ = 1;
98 uint32_t VP8GetValue(VP8BitReader* const br, int bits) {
101 v |= VP8GetBit(br, 0x80) << bits;
106 int32_t VP8GetSignedValue(VP8BitReader* const br, int bits) {
107 const int value = VP8GetValue(br, bits);
108 return VP8Get(br) ? -value : value;
125 void VP8LInitBitReader(VP8LBitReader* const br,
129 assert(br != NULL);
133 br->buf_ = start;
134 br->len_ = length;
135 br->val_ = 0;
136 br->pos_ = 0;
137 br->bit_pos_ = 0;
138 br->eos_ = 0;
139 br->error_ = 0;
140 for (i = 0; i < sizeof(br->val_) && i < br->len_; ++i) {
141 br->val_ |= ((vp8l_val_t)br->buf_[br->pos_]) << (8 * i);
142 ++br->pos_;
146 void VP8LBitReaderSetBuffer(VP8LBitReader* const br,
148 assert(br != NULL);
151 br->eos_ = (br->pos_ >= len);
152 br->buf_ = buf;
153 br->len_ = len;
157 static void ShiftBytes(VP8LBitReader* const br) {
158 while (br->bit_pos_ >= 8 && br->pos_ < br->len_) {
159 br->val_ >>= 8;
160 br->val_ |= ((vp8l_val_t)br->buf_[br->pos_]) << (LBITS - 8);
161 ++br->pos_;
162 br->bit_pos_ -= 8;
166 void VP8LFillBitWindow(VP8LBitReader* const br) {
167 if (br->bit_pos_ >= WBITS) {
169 if (br->pos_ + sizeof(br->val_) < br->len_) {
170 br->val_ >>= WBITS;
171 br->bit_pos_ -= WBITS;
174 br->val_ |= *(const vp8l_val_t*)(br->buf_ + br->pos_) << (LBITS - WBITS);
175 br->pos_ += LOG8_WBITS;
179 ShiftBytes(br); // Slow path.
180 if (br->pos_ == br->len_ && br->bit_pos_ == LBITS) {
181 br->eos_ = 1;
186 uint32_t VP8LReadBits(VP8LBitReader* const br, int n_bits) {
189 if (!br->eos_ && n_bits < MAX_NUM_BIT_READ) {
191 (uint32_t)(br->val_ >> br->bit_pos_) & kBitMask[n_bits];
192 const int new_bits = br->bit_pos_ + n_bits;
193 br->bit_pos_ = new_bits;
195 if (br->pos_ == br->len_) {
197 br->eos_ = 1;
200 ShiftBytes(br);
203 br->error_ = 1;
