#include "ac3.h"
#include "get_bits.h"
-#if CONFIG_HARDCODED_TABLES
-
/**
* Starting frequency coefficient bin for each critical band.
*/
79, 85, 97, 109, 121, 133, 157, 181, 205, 229, 253
};
+#if CONFIG_HARDCODED_TABLES
+
/**
* Map each frequency coefficient bin to the critical band that contains it.
*/
};
#else /* CONFIG_HARDCODED_TABLES */
-static uint8_t band_start_tab[51];
static uint8_t bin_to_band_tab[253];
#endif
} while (end > band_start_tab[band++]);
}
-/* AC-3 bit allocation. The algorithm is the one described in the AC-3
- spec. */
-void ac3_parametric_bit_allocation(AC3BitAllocParameters *s, uint8_t *bap,
- int8_t *exp, int start, int end,
- int snr_offset, int fast_gain, int is_lfe,
- int dba_mode, int dba_nsegs,
- uint8_t *dba_offsets, uint8_t *dba_lengths,
- uint8_t *dba_values)
-{
- int16_t psd[AC3_MAX_COEFS]; /* scaled exponents */
- int16_t band_psd[AC3_CRITICAL_BANDS]; /* interpolated exponents */
- int16_t mask[AC3_CRITICAL_BANDS]; /* masking value */
-
- ff_ac3_bit_alloc_calc_psd(exp, start, end, psd, band_psd);
-
- ff_ac3_bit_alloc_calc_mask(s, band_psd, start, end, fast_gain, is_lfe,
- dba_mode, dba_nsegs, dba_offsets, dba_lengths,
- dba_values, mask);
-
- ff_ac3_bit_alloc_calc_bap(mask, psd, start, end, snr_offset, s->floor,
- ff_ac3_bap_tab, bap);
-}
-
/**
* Initialize some tables.
* note: This function must remain thread safe because it is called by the
* AVParser init code.
*/
-av_cold void ac3_common_init(void)
+av_cold void ff_ac3_common_init(void)
{
#if !CONFIG_HARDCODED_TABLES
- /* compute bndtab and masktab from bandsz */
+ /* compute bin_to_band_tab from band_start_tab */
int bin = 0, band;
for (band = 0; band < AC3_CRITICAL_BANDS; band++) {
- int band_end = bin + ff_ac3_critical_band_size_tab[band];
- band_start_tab[band] = bin;
+ int band_end = band_start_tab[band+1];
while (bin < band_end)
bin_to_band_tab[bin++] = band;
}
- band_start_tab[AC3_CRITICAL_BANDS] = bin;
#endif /* !CONFIG_HARDCODED_TABLES */
}