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mlpdec: Unroll copying filter state data and filtering for the two filters. 

Originally committed as revision 18231 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Ramiro Polla 2009-03-30 02:59:45 +00:00
parent 0c5670a0e5
commit 0ae59bb01a
1 changed files with 15 additions and 13 deletions
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28
libavcodec/mlpdec.c
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@ -658,12 +658,12 @@ static void filter_channel(MLPDecodeContext *m, unsigned int substr,
unsigned int filter_shift = fp[FIR]->shift;
int32_t mask = MSB_MASK(s->quant_step_size[channel]);
int index = MAX_BLOCKSIZE;
int j, i;
int i;
for (j = 0; j < NUM_FILTERS; j++) {
memcpy(&filter_state_buffer[j][MAX_BLOCKSIZE], &fp[j]->state[0],
MAX_FIR_ORDER * sizeof(int32_t));
}
memcpy(&filter_state_buffer[FIR][MAX_BLOCKSIZE], &fp[FIR]->state[0],
MAX_FIR_ORDER * sizeof(int32_t));
memcpy(&filter_state_buffer[IIR][MAX_BLOCKSIZE], &fp[IIR]->state[0],
MAX_IIR_ORDER * sizeof(int32_t));
for (i = 0; i < s->blocksize; i++) {
int32_t residual = m->sample_buffer[i + s->blockpos][channel];
@ -673,10 +673,12 @@ static void filter_channel(MLPDecodeContext *m, unsigned int substr,
/* TODO: Move this code to DSPContext? */
for (j = 0; j < NUM_FILTERS; j++)
for (order = 0; order < fp[j]->order; order++)
accum += (int64_t)filter_state_buffer[j][index + order] *
fp[j]->coeff[order];
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];
accum = accum >> filter_shift;
result = (accum + residual) & mask;
@ -689,10 +691,10 @@ static void filter_channel(MLPDecodeContext *m, unsigned int substr,
m->sample_buffer[i + s->blockpos][channel] = result;
}
for (j = 0; j < NUM_FILTERS; j++) {
memcpy(&fp[j]->state[0], &filter_state_buffer[j][index],
MAX_FIR_ORDER * sizeof(int32_t));
}
memcpy(&fp[FIR]->state[0], &filter_state_buffer[FIR][index],
MAX_FIR_ORDER * sizeof(int32_t));
memcpy(&fp[IIR]->state[0], &filter_state_buffer[IIR][index],
MAX_IIR_ORDER * sizeof(int32_t));
}
/** Read a block of PCM residual data (or actual if no filtering active). */