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ac3enc: differentiate between current block and reference block in bit_alloc()

This commit is contained in:
Justin Ruggles 2011-04-15 19:55:09 -04:00
parent 6b2636bba6
commit 987fe2dc55
1 changed files with 11 additions and 7 deletions
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18
libavcodec/ac3enc.c
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@ -1010,7 +1010,8 @@ static int bit_alloc(AC3EncodeContext *s, int snr_offset)
reset_block_bap(s);
mantissa_bits = 0;
for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) {
AC3Block *block;
AC3Block *block = &s->blocks[blk];
AC3Block *ref_block;
// initialize grouped mantissa counts. these are set so that they are
// padded to the next whole group size when bits are counted in
// compute_mantissa_size_final
@ -1022,14 +1023,17 @@ static int bit_alloc(AC3EncodeContext *s, int snr_offset)
blocks within a frame are the exponent values. We can take
advantage of that by reusing the bit allocation pointers
whenever we reuse exponents. */
block = s->blocks[blk].exp_ref_block[ch];
ref_block = block->exp_ref_block[ch];
if (s->exp_strategy[ch][blk] != EXP_REUSE) {
s->ac3dsp.bit_alloc_calc_bap(block->mask[ch], block->psd[ch], 0,
s->nb_coefs[ch], snr_offset,
s->bit_alloc.floor, ff_ac3_bap_tab,
block->bap[ch]);
s->ac3dsp.bit_alloc_calc_bap(ref_block->mask[ch],
ref_block->psd[ch], 0,
s->nb_coefs[ch], snr_offset,
s->bit_alloc.floor, ff_ac3_bap_tab,
ref_block->bap[ch]);
}
mantissa_bits += s->ac3dsp.compute_mantissa_size(mant_cnt, block->bap[ch], s->nb_coefs[ch]);
mantissa_bits += s->ac3dsp.compute_mantissa_size(mant_cnt,
ref_block->bap[ch],
s->nb_coefs[ch]);
}
mantissa_bits += compute_mantissa_size_final(mant_cnt);
}