#include "wma.h"
#include "bitstream.h"
+/** Read an 8, 16, or 32 bit entity from a VLC table. */
#define GET_DATA(v, table, i, size) \
{\
const uint8_t *ptr = (const uint8_t *)table + i * size; \
table = &vlc->table[table_index];
for (i = 0; i < table_size; i++) {
- table[i][1] = 0; //bits
- table[i][0] = -1; //codes
+ table[i][1] = 0; /* bits */
+ table[i][0] = -1; /* codes */
}
- /* map codes and compute auxillary table sizes */
+ /* map codes and compute auxiliary table sizes */
for (i = 0; i < nb_codes; i++) {
GET_DATA(n, bits, i, 1);
GET_DATA(code, codes, i, codes_size);
PARA_EMERG_LOG("incorrect code\n");
exit(EXIT_FAILURE);
}
- table[j][1] = n; //bits
+ table[j][1] = n; /* bits */
table[j][0] = symbol;
j++;
}
n -= table_nb_bits;
j = (code >> n) & ((1 << table_nb_bits) - 1);
/* compute table size */
- n1 = -table[j][1]; //bits
+ n1 = -table[j][1]; /* bits */
if (n > n1)
n1 = n;
- table[j][1] = -n1; //bits
+ table[j][1] = -n1; /* bits */
}
}
- /* fill auxillary tables recursively */
+ /* fill auxiliary tables recursively */
for (i = 0; i < table_size; i++) {
- n = table[i][1]; //bits
+ n = table[i][1]; /* bits */
if (n < 0) {
n = -n;
if (n > table_nb_bits) {
n = table_nb_bits;
- table[i][1] = -n; //bits
+ table[i][1] = -n; /* bits */
}
idx = build_table(vlc, n, nb_codes, bits, codes,
codes_size, (code_prefix << table_nb_bits) | i,
n_prefix + table_nb_bits);
/* vlc->table might have changed */
table = &vlc->table[table_index];
- table[i][0] = idx; //code
+ table[i][0] = idx; /* code */
}
}
return table_index;
/**
* Build VLC decoding tables suitable for use with get_vlc().
*
- * \param nb_bits Set the decoding table size (2^nb_bits)
- * entries. The bigger it is, the faster is the decoding. But
- * it should not be too big to save memory and L1 cache. '9'
- * is a good compromise.
+ * \param vlc The structure to be initialized.
+ *
+ * \param nb_bits Set the decoding table size (2^nb_bits) entries. The bigger
+ * it is, the faster is the decoding. But it should not be too big to save
+ * memory and L1 cache. '9' is a good compromise.
*
* \param nb_codes Number of vlcs codes.
*
build_table(vlc, nb_bits, nb_codes, bits, codes, codes_size, 0, 0);
}
+/**
+ * Deallocate all resources of a VLC table.
+ *
+ * \param vlc Pointer to an initialized vlc structure.
+ *
+ * The table given by \a vlc must have been initialized earlier via \ref
+ * init_vlc().
+ */
void free_vlc(struct vlc *vlc)
{
freep(&vlc->table);
*
* \param gbc The getbit context structure.
*
+ * \param table The vlc tables to use.
+ *
* \param bits The number of bits which will be read at once, must be
* identical to nb_bits in init_vlc().
*
}
}
skip_bits(gbc, n);
- return code;
+ return code >= 0? code : -E_VLC;
}