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nellymoserdec: Saner and faster IMDCT windowing

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Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>
This commit is contained in:
Vitor Sessak 2012-02-29 19:39:16 +01:00 committed by Ronald S. Bultje
parent 882abda5a2
commit 5cd1337f5d
1 changed files with 8 additions and 8 deletions
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16
libavcodec/nellymoserdec.c
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@ -49,14 +49,15 @@ typedef struct NellyMoserDecodeContext {
AVCodecContext* avctx;
AVFrame frame;
float *float_buf;
DECLARE_ALIGNED(16, float, state)[NELLY_BUF_LEN];
AVLFG random_state;
GetBitContext gb;
float scale_bias;
DSPContext dsp;
FFTContext imdct_ctx;
FmtConvertContext fmt_conv;
DECLARE_ALIGNED(32, float, imdct_out)[NELLY_BUF_LEN * 2];
DECLARE_ALIGNED(32, float, imdct_buf)[2][NELLY_BUF_LEN];
float *imdct_out;
float *imdct_prev;
} NellyMoserDecodeContext;
static void nelly_decode_block(NellyMoserDecodeContext *s,
@ -106,12 +107,9 @@ static void nelly_decode_block(NellyMoserDecodeContext *s,
memset(&aptr[NELLY_FILL_LEN], 0,
(NELLY_BUF_LEN - NELLY_FILL_LEN) * sizeof(float));
s->imdct_ctx.imdct_calc(&s->imdct_ctx, s->imdct_out, aptr);
/* XXX: overlapping and windowing should be part of a more
generic imdct function */
s->dsp.vector_fmul_reverse(s->state, s->state, ff_sine_128, NELLY_BUF_LEN);
s->dsp.vector_fmul_add(aptr, s->imdct_out, ff_sine_128, s->state, NELLY_BUF_LEN);
memcpy(s->state, s->imdct_out + NELLY_BUF_LEN, sizeof(float)*NELLY_BUF_LEN);
s->imdct_ctx.imdct_half(&s->imdct_ctx, s->imdct_out, aptr);
s->dsp.vector_fmul_window(aptr, s->imdct_prev + NELLY_BUF_LEN/2, s->imdct_out, ff_sine_128, NELLY_BUF_LEN/2);
FFSWAP(float *, s->imdct_out, s->imdct_prev);
}
}
@ -119,6 +117,8 @@ static av_cold int decode_init(AVCodecContext * avctx) {
NellyMoserDecodeContext *s = avctx->priv_data;
s->avctx = avctx;
s->imdct_out = s->imdct_buf[0];
s->imdct_prev = s->imdct_buf[1];
av_lfg_init(&s->random_state, 0);
ff_mdct_init(&s->imdct_ctx, 8, 1, 1.0);