diff options
Diffstat (limited to 'libavcodec/ac3enc_template.c')
| -rw-r--r-- | libavcodec/ac3enc_template.c | 19 |
1 files changed, 7 insertions, 12 deletions
diff --git a/libavcodec/ac3enc_template.c b/libavcodec/ac3enc_template.c index 3396ed17b7..41982071cf 100644 --- a/libavcodec/ac3enc_template.c +++ b/libavcodec/ac3enc_template.c @@ -43,6 +43,9 @@ static void clip_coefficients(DSPContext *dsp, CoefType *coef, unsigned int len) static CoefType calc_cpl_coord(CoefSumType energy_ch, CoefSumType energy_cpl); +static void sum_square_butterfly(AC3EncodeContext *s, CoefSumType sum[4], + const CoefType *coef0, const CoefType *coef1, + int len); int AC3_NAME(allocate_sample_buffers)(AC3EncodeContext *s) { @@ -334,7 +337,7 @@ static void apply_channel_coupling(AC3EncodeContext *s) static void compute_rematrixing_strategy(AC3EncodeContext *s) { int nb_coefs; - int blk, bnd, i; + int blk, bnd; AC3Block *block, *av_uninit(block0); if (s->channel_mode != AC3_CHMODE_STEREO) @@ -362,17 +365,9 @@ static void compute_rematrixing_strategy(AC3EncodeContext *s) /* calculate calculate sum of squared coeffs for one band in one block */ int start = ff_ac3_rematrix_band_tab[bnd]; int end = FFMIN(nb_coefs, ff_ac3_rematrix_band_tab[bnd+1]); - CoefSumType sum[4] = {0,}; - for (i = start; i < end; i++) { - CoefType lt = block->mdct_coef[1][i]; - CoefType rt = block->mdct_coef[2][i]; - CoefType md = lt + rt; - CoefType sd = lt - rt; - MAC_COEF(sum[0], lt, lt); - MAC_COEF(sum[1], rt, rt); - MAC_COEF(sum[2], md, md); - MAC_COEF(sum[3], sd, sd); - } + CoefSumType sum[4]; + sum_square_butterfly(s, sum, block->mdct_coef[1] + start, + block->mdct_coef[2] + start, end - start); /* compare sums to determine if rematrixing will be used for this band */ if (FFMIN(sum[2], sum[3]) < FFMIN(sum[0], sum[1])) |