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Perform coefficient transformations in Bink Audio DCT decoder (issue1770)

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Originally committed as revision 22167 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Peter Ross 2010-03-03 09:51:56 +00:00
parent a27998010c
commit 54063e37c1
1 changed files with 5 additions and 2 deletions
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7
libavcodec/binkaudio.c
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@ -125,7 +125,7 @@ static av_cold int decode_init(AVCodecContext *avctx)
if (CONFIG_BINKAUDIO_RDFT_DECODER && avctx->codec->id == CODEC_ID_BINKAUDIO_RDFT)
ff_rdft_init(&s->trans.rdft, frame_len_bits, IRIDFT);
else if (CONFIG_BINKAUDIO_DCT_DECODER)
ff_dct_init(&s->trans.dct, frame_len_bits, 0);
ff_dct_init(&s->trans.dct, frame_len_bits, 1);
else
return -1;
@ -211,8 +211,11 @@ static void decode_block(BinkAudioContext *s, short *out, int use_dct)
}
}
if (CONFIG_BINKAUDIO_DCT_DECODER && use_dct)
if (CONFIG_BINKAUDIO_DCT_DECODER && use_dct) {
coeffs[0] /= 0.5;
ff_dct_calc (&s->trans.dct, coeffs);
s->dsp.vector_fmul_scalar(coeffs, coeffs, s->frame_len / 2, s->frame_len);
}
else if (CONFIG_BINKAUDIO_RDFT_DECODER)
ff_rdft_calc(&s->trans.rdft, coeffs);
}