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aacenc: aac_psy_init(): Factorize line_to_frequency. 

Originally committed as revision 24232 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Alex Converse 2010-07-14 04:10:47 +00:00
parent d7194e3b73
commit cecaf7d71a
1 changed files with 4 additions and 3 deletions
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7
libavcodec/aacpsy.c
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@ -124,11 +124,12 @@ static av_cold int psy_3gpp_init(FFPsyContext *ctx) {
minath = ath(3410, ATH_ADD);
for (j = 0; j < 2; j++) {
Psy3gppCoeffs *coeffs = &pctx->psy_coef[j];
float line_to_frequency = ctx->avctx->sample_rate / 2048.0f;
i = 0;
prev = 0.0;
for (g = 0; g < ctx->num_bands[j]; g++) {
i += ctx->bands[j][g];
bark = calc_bark((i-1) * ctx->avctx->sample_rate / 2048.0);
bark = calc_bark((i-1) * line_to_frequency);
coeffs->barks[g] = (bark + prev) / 2.0;
prev = bark;
}
@ -138,9 +139,9 @@ static av_cold int psy_3gpp_init(FFPsyContext *ctx) {
}
start = 0;
for (g = 0; g < ctx->num_bands[j]; g++) {
minscale = ath(ctx->avctx->sample_rate * start / 1024.0 / 2.0, ATH_ADD);
minscale = ath(start * line_to_frequency, ATH_ADD);
for (i = 1; i < ctx->bands[j][g]; i++)
minscale = FFMIN(minscale, ath(ctx->avctx->sample_rate * (start + i) / 1024.0 / 2.0, ATH_ADD));
minscale = FFMIN(minscale, ath((start + i) * line_to_frequency, ATH_ADD));
coeffs->ath[g] = minscale - minath;
start += ctx->bands[j][g];
}