From e71365f427964597a2f53f8af6fa60a9aaecffb5 Mon Sep 17 00:00:00 2001 From: Ramiro Polla Date: Mon, 30 Mar 2009 03:05:38 +0000 Subject: mlpdec: Split filter_state_buffer into [fi]irbuf and fp to [fi]ir. Originally committed as revision 18232 to svn://svn.ffmpeg.org/ffmpeg/trunk --- libavcodec/mlpdec.c | 33 +++++++++++++++++---------------- 1 file changed, 17 insertions(+), 16 deletions(-) (limited to 'libavcodec/mlpdec.c') diff --git a/libavcodec/mlpdec.c b/libavcodec/mlpdec.c index dc4efe255d..727d47f847 100644 --- a/libavcodec/mlpdec.c +++ b/libavcodec/mlpdec.c @@ -652,17 +652,18 @@ static void filter_channel(MLPDecodeContext *m, unsigned int substr, unsigned int channel) { SubStream *s = &m->substream[substr]; - int32_t filter_state_buffer[NUM_FILTERS][MAX_BLOCKSIZE + MAX_FIR_ORDER]; - FilterParams *fp[NUM_FILTERS] = { &m->channel_params[channel].filter_params[FIR], - &m->channel_params[channel].filter_params[IIR], }; - unsigned int filter_shift = fp[FIR]->shift; + int32_t firbuf[MAX_BLOCKSIZE + MAX_FIR_ORDER]; + int32_t iirbuf[MAX_BLOCKSIZE + MAX_IIR_ORDER]; + FilterParams *fir = &m->channel_params[channel].filter_params[FIR]; + FilterParams *iir = &m->channel_params[channel].filter_params[IIR]; + unsigned int filter_shift = fir->shift; int32_t mask = MSB_MASK(s->quant_step_size[channel]); int index = MAX_BLOCKSIZE; int i; - memcpy(&filter_state_buffer[FIR][MAX_BLOCKSIZE], &fp[FIR]->state[0], + memcpy(&firbuf[MAX_BLOCKSIZE], &fir->state[0], MAX_FIR_ORDER * sizeof(int32_t)); - memcpy(&filter_state_buffer[IIR][MAX_BLOCKSIZE], &fp[IIR]->state[0], + memcpy(&iirbuf[MAX_BLOCKSIZE], &iir->state[0], MAX_IIR_ORDER * sizeof(int32_t)); for (i = 0; i < s->blocksize; i++) { @@ -673,27 +674,27 @@ static void filter_channel(MLPDecodeContext *m, unsigned int substr, /* TODO: Move this code to DSPContext? */ - for (order = 0; order < fp[FIR]->order; order++) - accum += (int64_t)filter_state_buffer[FIR][index + order] * - fp[FIR]->coeff[order]; - for (order = 0; order < fp[IIR]->order; order++) - accum += (int64_t)filter_state_buffer[IIR][index + order] * - fp[IIR]->coeff[order]; + for (order = 0; order < fir->order; order++) + accum += (int64_t)firbuf[index + order] * + fir->coeff[order]; + for (order = 0; order < iir->order; order++) + accum += (int64_t)iirbuf[index + order] * + iir->coeff[order]; accum = accum >> filter_shift; result = (accum + residual) & mask; --index; - filter_state_buffer[FIR][index] = result; - filter_state_buffer[IIR][index] = result - accum; + firbuf[index] = result; + iirbuf[index] = result - accum; m->sample_buffer[i + s->blockpos][channel] = result; } - memcpy(&fp[FIR]->state[0], &filter_state_buffer[FIR][index], + memcpy(&fir->state[0], &firbuf[index], MAX_FIR_ORDER * sizeof(int32_t)); - memcpy(&fp[IIR]->state[0], &filter_state_buffer[IIR][index], + memcpy(&iir->state[0], &iirbuf[index], MAX_IIR_ORDER * sizeof(int32_t)); } -- cgit v1.2.3