platform/allegro-dvt/nal-rbsp.c

17 #include "nal-rbsp.h"
19 void rbsp_init(struct rbsp *rbsp, void *addr, size_t size,
22 	if (!rbsp)
25 	rbsp->data = addr;
26 	rbsp->size = size;
27 	rbsp->pos = 0;
28 	rbsp->ops = ops;
29 	rbsp->error = 0;
32 void rbsp_unsupported(struct rbsp *rbsp)
34 	rbsp->error = -EINVAL;
37 static int rbsp_read_bits(struct rbsp *rbsp, int n, unsigned int *value);
38 static int rbsp_write_bits(struct rbsp *rbsp, int n, unsigned int value);
48 static int add_emulation_prevention_three_byte(struct rbsp *rbsp)
50 	rbsp->num_consecutive_zeros = 0;
51 	rbsp_write_bits(rbsp, 8, EMULATION_PREVENTION_THREE_BYTE);
56 static int discard_emulation_prevention_three_byte(struct rbsp *rbsp)
60 	rbsp->num_consecutive_zeros = 0;
61 	rbsp_read_bits(rbsp, 8, &tmp);
68 static inline int rbsp_read_bit(struct rbsp *rbsp)
75 	if (rbsp->num_consecutive_zeros == 22) {
76 		err = discard_emulation_prevention_three_byte(rbsp);
81 	shift = 7 - (rbsp->pos % 8);
82 	ofs = rbsp->pos / 8;
83 	if (ofs >= rbsp->size)
86 	bit = (rbsp->data[ofs] >> shift) & 1;
88 	rbsp->pos++;
91 	    (rbsp->num_consecutive_zeros < 7 && (rbsp->pos % 8 == 0)))
92 		rbsp->num_consecutive_zeros = 0;
94 		rbsp->num_consecutive_zeros++;
99 static inline int rbsp_write_bit(struct rbsp *rbsp, bool value)
104 	if (rbsp->num_consecutive_zeros == 22)
105 		add_emulation_prevention_three_byte(rbsp);
107 	shift = 7 - (rbsp->pos % 8);
108 	ofs = rbsp->pos / 8;
109 	if (ofs >= rbsp->size)
112 	rbsp->data[ofs] &= ~(1 << shift);
113 	rbsp->data[ofs] |= value << shift;
115 	rbsp->pos++;
118 	    (rbsp->num_consecutive_zeros < 7 && (rbsp->pos % 8 == 0))) {
119 		rbsp->num_consecutive_zeros = 0;
121 		rbsp->num_consecutive_zeros++;
127 static inline int rbsp_read_bits(struct rbsp *rbsp, int n, unsigned int *value)
137 		bit = rbsp_read_bit(rbsp);
149 static int rbsp_write_bits(struct rbsp *rbsp, int n, unsigned int value)
157 		ret = rbsp_write_bit(rbsp, (value >> n) & 1);
165 static int rbsp_read_uev(struct rbsp *rbsp, unsigned int *value)
171 	while ((ret = rbsp_read_bit(rbsp)) == 0)
177 		ret = rbsp_read_bits(rbsp, leading_zero_bits, &tmp);
188 static int rbsp_write_uev(struct rbsp *rbsp, unsigned int *value)
198 	ret = rbsp_write_bits(rbsp, leading_zero_bits, 0);
202 	return rbsp_write_bits(rbsp, leading_zero_bits + 1, *value + 1);
205 static int rbsp_read_sev(struct rbsp *rbsp, int *value)
210 	ret = rbsp_read_uev(rbsp, &tmp);
224 static int rbsp_write_sev(struct rbsp *rbsp, int *value)
236 	return rbsp_write_uev(rbsp, &tmp);
239 static int __rbsp_write_bit(struct rbsp *rbsp, int *value)
241 	return rbsp_write_bit(rbsp, *value);
244 static int __rbsp_write_bits(struct rbsp *rbsp, int n, unsigned int *value)
246 	return rbsp_write_bits(rbsp, n, *value);
256 static int __rbsp_read_bit(struct rbsp *rbsp, int *value)
258 	int tmp = rbsp_read_bit(rbsp);
274 void rbsp_bit(struct rbsp *rbsp, int *value)
276 	if (rbsp->error)
278 	rbsp->error = rbsp->ops->rbsp_bit(rbsp, value);
281 void rbsp_bits(struct rbsp *rbsp, int n, int *value)
283 	if (rbsp->error)
285 	rbsp->error = rbsp->ops->rbsp_bits(rbsp, n, value);
288 void rbsp_uev(struct rbsp *rbsp, unsigned int *value)
290 	if (rbsp->error)
292 	rbsp->error = rbsp->ops->rbsp_uev(rbsp, value);
295 void rbsp_sev(struct rbsp *rbsp, int *value)
297 	if (rbsp->error)
299 	rbsp->error = rbsp->ops->rbsp_sev(rbsp, value);
302 void rbsp_trailing_bits(struct rbsp *rbsp)
307 	rbsp_bit(rbsp, &rbsp_stop_one_bit);
308 	rbsp_bits(rbsp, round_up(rbsp->pos, 8) - rbsp->pos,