Lines Matching defs:vlc
87 vl_vlc_next_input(struct vl_vlc *vlc)
89 unsigned len = vlc->sizes[0];
91 assert(vlc);
92 assert(vlc->bytes_left);
94 if (len < vlc->bytes_left)
95 vlc->bytes_left -= len;
97 len = vlc->bytes_left;
98 vlc->bytes_left = 0;
101 vlc->data = (const uint8_t *) vlc->inputs[0];
102 vlc->end = vlc->data + len;
104 ++vlc->inputs;
105 ++vlc->sizes;
112 vl_vlc_align_data_ptr(struct vl_vlc *vlc)
115 while (vlc->data != vlc->end && ((uintptr_t)vlc->data) & 3) {
116 vlc->buffer |= (uint64_t)*vlc->data << (24 + vlc->invalid_bits);
117 ++vlc->data;
118 vlc->invalid_bits -= 8;
126 vl_vlc_fillbits(struct vl_vlc *vlc)
128 assert(vlc);
131 while (vlc->invalid_bits > 0) {
132 unsigned bytes_left = vlc->end - vlc->data;
137 if (vlc->bytes_left) {
139 vl_vlc_next_input(vlc);
140 vl_vlc_align_data_ptr(vlc);
148 uint64_t value = *(const uint32_t*)vlc->data;
154 vlc->buffer |= value << vlc->invalid_bits;
155 vlc->data += 4;
156 vlc->invalid_bits -= 32;
161 } else while (vlc->data < vlc->end) {
164 vlc->buffer |= (uint64_t)*vlc->data << (24 + vlc->invalid_bits);
165 ++vlc->data;
166 vlc->invalid_bits -= 8;
172 * initialize vlc structure and start reading from first input buffer
175 vl_vlc_init(struct vl_vlc *vlc, unsigned num_inputs,
180 assert(vlc);
183 vlc->buffer = 0;
184 vlc->invalid_bits = 32;
185 vlc->inputs = inputs;
186 vlc->sizes = sizes;
187 vlc->bytes_left = 0;
190 vlc->bytes_left += sizes[i];
192 if (vlc->bytes_left) {
193 vl_vlc_next_input(vlc);
194 vl_vlc_align_data_ptr(vlc);
195 vl_vlc_fillbits(vlc);
203 vl_vlc_valid_bits(struct vl_vlc *vlc)
205 return 32 - vlc->invalid_bits;
212 vl_vlc_bits_left(struct vl_vlc *vlc)
214 signed bytes_left = vlc->end - vlc->data;
215 bytes_left += vlc->bytes_left;
216 return bytes_left * 8 + vl_vlc_valid_bits(vlc);
223 vl_vlc_peekbits(struct vl_vlc *vlc, unsigned num_bits)
225 assert(vl_vlc_valid_bits(vlc) >= num_bits || vlc->data >= vlc->end);
226 return vlc->buffer >> (64 - num_bits);
233 vl_vlc_eatbits(struct vl_vlc *vlc, unsigned num_bits)
235 assert(vl_vlc_valid_bits(vlc) >= num_bits);
237 vlc->buffer <<= num_bits;
238 vlc->invalid_bits += num_bits;
245 vl_vlc_get_uimsbf(struct vl_vlc *vlc, unsigned num_bits)
249 assert(vl_vlc_valid_bits(vlc) >= num_bits);
251 value = vlc->buffer >> (64 - num_bits);
252 vl_vlc_eatbits(vlc, num_bits);
261 vl_vlc_get_simsbf(struct vl_vlc *vlc, unsigned num_bits)
265 assert(vl_vlc_valid_bits(vlc) >= num_bits);
267 value = ((int64_t)vlc->buffer) >> (64 - num_bits);
268 vl_vlc_eatbits(vlc, num_bits);
277 vl_vlc_get_vlclbf(struct vl_vlc *vlc, const struct vl_vlc_entry *tbl, unsigned num_bits)
279 tbl += vl_vlc_peekbits(vlc, num_bits);
280 vl_vlc_eatbits(vlc, tbl->length);
288 vl_vlc_search_byte(struct vl_vlc *vlc, unsigned num_bits, uint8_t value)
291 assert((vl_vlc_valid_bits(vlc) % 8) == 0);
295 while (vl_vlc_valid_bits(vlc) > 0) {
297 if (vl_vlc_peekbits(vlc, 8) == value) {
298 vl_vlc_fillbits(vlc);
302 vl_vlc_eatbits(vlc, 8);
315 if (vlc->data == vlc->end) {
316 if (vlc->bytes_left)
318 vl_vlc_next_input(vlc);
324 if (*vlc->data == value) {
325 vl_vlc_align_data_ptr(vlc);
326 vl_vlc_fillbits(vlc);
330 ++vlc->data;
334 vl_vlc_align_data_ptr(vlc);
345 vl_vlc_removebits(struct vl_vlc *vlc, unsigned pos, unsigned num_bits)
347 uint64_t lo = (vlc->buffer & (~0UL >> (pos + num_bits))) << num_bits;
348 uint64_t hi = (vlc->buffer & (~0UL << (64 - pos)));
349 vlc->buffer = lo | hi;
350 vlc->invalid_bits += num_bits;
357 vl_vlc_limit(struct vl_vlc *vlc, unsigned bits_left)
359 assert(bits_left <= vl_vlc_bits_left(vlc));
361 vl_vlc_fillbits(vlc);
362 if (bits_left < vl_vlc_valid_bits(vlc)) {
363 vlc->invalid_bits = 32 - bits_left;
364 vlc->buffer &= ~0L << (vlc->invalid_bits + 32);
365 vlc->end = vlc->data;
366 vlc->bytes_left = 0;
368 assert((bits_left - vl_vlc_valid_bits(vlc)) % 8 == 0);
369 vlc->bytes_left = (bits_left - vl_vlc_valid_bits(vlc)) / 8;
370 if (vlc->bytes_left < (vlc->end - vlc->data)) {
371 vlc->end = vlc->data + vlc->bytes_left;
372 vlc->bytes_left = 0;
374 vlc->bytes_left -= vlc->end - vlc->data;