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ac3enc: add channel coupling support

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Channel coupling is an optional AC-3 feature that increases quality by
combining high frequency information from multiple channels into a
single channel. The per-channel high frequency information is sent with
less accuracy in both the frequency and time domains. This allows more
bits to be used for lower frequencies while preserving enough
information to reconstruct the high frequencies.
This commit is contained in:
Justin Ruggles
2011-05-24 07:52:31 +02:00
committed by Reinhard Tartler
parent a7a187a1be
commit 7f3a7b5c40
10 changed files with 787 additions and 179 deletions
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libavcodec/ac3enc_float.c
+4 -2
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@@ -93,8 +93,10 @@ static int normalize_samples(AC3EncodeContext *s)
*/
static void scale_coefficients(AC3EncodeContext *s)
{
s->ac3dsp.float_to_fixed24(s->fixed_coef_buffer, s->mdct_coef_buffer,
AC3_MAX_COEFS * AC3_MAX_BLOCKS * s->channels);
int chan_size = AC3_MAX_COEFS * AC3_MAX_BLOCKS;
s->ac3dsp.float_to_fixed24(s->fixed_coef_buffer + chan_size,
s->mdct_coef_buffer + chan_size,
chan_size * s->channels);
}