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do the -1 outside of the transform 

Originally committed as revision 12852 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2008-04-16 14:49:10 +00:00
parent 6fab025d30
commit dcafb28d01
1 changed files with 4 additions and 4 deletions
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8
libavcodec/nellymoserdec.c
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@ -120,8 +120,8 @@ static void overlap_and_window(NellyMoserDecodeContext *s, float *state, float *
top = NELLY_BUF_LEN-1;
while (bot < NELLY_BUF_LEN/2) {
audio[bot] = (- a_in[bot]*sine_window[bot]-state[bot]*sine_window[top])/s->scale_bias + s->add_bias;
audio[top] = (-state[bot]*sine_window[bot]- a_in[top]*sine_window[top])/s->scale_bias + s->add_bias;
audio[bot] = ( a_in[bot]*sine_window[bot]+state[bot]*sine_window[top])/s->scale_bias + s->add_bias;
audio[top] = (state[bot]*sine_window[bot]+ a_in[top]*sine_window[top])/s->scale_bias + s->add_bias;
state[bot] = a_in[bot + NELLY_BUF_LEN];
bot++;
@ -299,11 +299,11 @@ void nelly_decode_block(NellyMoserDecodeContext *s, const unsigned char block[NE
for (j = 0; j < NELLY_FILL_LEN; j++) {
if (bits[j] <= 0) {
aptr[j] = M_SQRT1_2*pows[j];
if (av_random(&s->random_state) & 1)
if (!(av_random(&s->random_state) & 1))
aptr[j] *= -1.0;
} else {
v = get_bits(&s->gb, bits[j]);
aptr[j] = dequantization_table[(1<<bits[j])-1+v]*pows[j];
aptr[j] = -dequantization_table[(1<<bits[j])-1+v]*pows[j];
}
}
memset(&aptr[NELLY_FILL_LEN], 0,