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Small simplification
Originally committed as revision 11026 to svn://svn.ffmpeg.org/ffmpeg/trunk
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parent
97c8b06470
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2b992d0e88
@ -123,9 +123,9 @@ static void overlap_and_window(NellyMoserDecodeContext *s, float *state, float *
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while (bot < NELLY_BUF_LEN/4) {
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s_bot = audio[bot];
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s_top = audio[top];
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audio[bot] = (audio[mid_up]*sine_window[bot]-state[bot ]*sine_window[top])/s->scale_bias + s->add_bias;
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audio[top] = (-state[bot ]*sine_window[bot]-audio[mid_up]*sine_window[top])/s->scale_bias + s->add_bias;
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s_top = -audio[top];
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audio[bot] = (-audio[mid_up]*sine_window[bot]-state[bot ]*sine_window[top])/s->scale_bias + s->add_bias;
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audio[top] = (-state[bot ]*sine_window[bot]+audio[mid_up]*sine_window[top])/s->scale_bias + s->add_bias;
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state[bot] = audio[mid_down];
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audio[mid_down] = (s_top *sine_window[mid_down]-state[mid_down]*sine_window[mid_up])/s->scale_bias + s->add_bias;
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@ -281,7 +281,6 @@ void nelly_decode_block(NellyMoserDecodeContext *s, unsigned char block[NELLY_BL
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float *aptr, *bptr, *pptr, val, pval;
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int bits[NELLY_BUF_LEN];
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unsigned char v;
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float a;
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init_get_bits(&s->gb, block, NELLY_BLOCK_LEN * 8);
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@ -324,10 +323,9 @@ void nelly_decode_block(NellyMoserDecodeContext *s, unsigned char block[NELLY_BL
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aptr, s->imdct_tmp);
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/* XXX: overlapping and windowing should be part of a more
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generic imdct function */
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a = 1.0 / 8.0;
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for(j = 0; j < NELLY_BUF_LEN / 2; j++) {
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aptr[j] = s->imdct_out[j + NELLY_BUF_LEN + NELLY_BUF_LEN / 2] * a;
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aptr[j + NELLY_BUF_LEN / 2] = -s->imdct_out[j] * a;
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aptr[j] = s->imdct_out[j + NELLY_BUF_LEN + NELLY_BUF_LEN / 2];
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aptr[j + NELLY_BUF_LEN / 2] = s->imdct_out[j];
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}
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overlap_and_window(s, s->state, aptr);
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}
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@ -345,10 +343,10 @@ static int decode_init(AVCodecContext * avctx) {
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if(s->dsp.float_to_int16 == ff_float_to_int16_c) {
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s->add_bias = 385;
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s->scale_bias = 32768;
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s->scale_bias = 8*32768;
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} else {
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s->add_bias = 0;
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s->scale_bias = 1;
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s->scale_bias = 1*8;
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}
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/* Generate overlap window */
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