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nellymoserdec: use dsp functions for overlap and windowing

This commit is contained in:
Justin Ruggles 2011-10-28 14:15:25 -04:00
parent 8c9581f052
commit 77c8ef9a36
1 changed files with 4 additions and 19 deletions
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23
libavcodec/nellymoserdec.c
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@ -48,7 +48,7 @@
typedef struct NellyMoserDecodeContext {
AVCodecContext* avctx;
float *float_buf;
float state[NELLY_BUF_LEN];
DECLARE_ALIGNED(16, float, state)[NELLY_BUF_LEN];
AVLFG random_state;
GetBitContext gb;
float scale_bias;
@ -58,23 +58,6 @@ typedef struct NellyMoserDecodeContext {
DECLARE_ALIGNED(32, float, imdct_out)[NELLY_BUF_LEN * 2];
} NellyMoserDecodeContext;
static void overlap_and_window(NellyMoserDecodeContext *s, float *state, float *audio, float *a_in)
{
int bot, top;
bot = 0;
top = NELLY_BUF_LEN-1;
while (bot < NELLY_BUF_LEN) {
audio[bot] = a_in [bot]*ff_sine_128[bot]
+state[bot]*ff_sine_128[top];
bot++;
top--;
}
memcpy(state, a_in + NELLY_BUF_LEN, sizeof(float)*NELLY_BUF_LEN);
}
static void nelly_decode_block(NellyMoserDecodeContext *s,
const unsigned char block[NELLY_BLOCK_LEN],
float audio[NELLY_SAMPLES])
@ -125,7 +108,9 @@ static void nelly_decode_block(NellyMoserDecodeContext *s,
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 */
overlap_and_window(s, s->state, aptr, s->imdct_out);
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);
}
}