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Code Issues Releases Activity

mlpdec: Use some context arrays with local variables in rematrix_channels().

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Originally committed as revision 18613 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Ramiro Polla 2009-04-18 19:46:41 +00:00
parent 15e6748b72
commit 63ad832dd6
1 changed files with 5 additions and 3 deletions
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8
libavcodec/mlpdec.c
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@ -848,23 +848,25 @@ static void rematrix_channels(MLPDecodeContext *m, unsigned int substr)
int matrix_noise_shift = s->matrix_noise_shift[mat];
unsigned int dest_ch = s->matrix_out_ch[mat];
int32_t mask = MSB_MASK(s->quant_step_size[dest_ch]);
int32_t *coeffs = s->matrix_coeff[mat];
int index = s->num_primitive_matrices - mat;
int index2 = 2 * index + 1;
/* TODO: DSPContext? */
for (i = 0; i < s->blockpos; i++) {
int32_t *samples = m->sample_buffer[i];
int64_t accum = 0;
for (src_ch = 0; src_ch <= maxchan; src_ch++) {
accum += (int64_t)m->sample_buffer[i][src_ch]
* s->matrix_coeff[mat][src_ch];
accum += (int64_t)samples[src_ch]
* coeffs[src_ch];
}
if (matrix_noise_shift) {
index &= m->access_unit_size_pow2 - 1;
accum += m->noise_buffer[index] << (matrix_noise_shift + 7);
index += index2;
}
m->sample_buffer[i][dest_ch] = ((accum >> 14) & mask)
samples[dest_ch] = ((accum >> 14) & mask)
+ m->bypassed_lsbs[i][mat];
}
}