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Minor TF cleanup (tf_sum was useless), plus comments

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This commit is contained in:
Jean-Marc Valin 2016-06-08 02:15:21 -04:00
parent f705e9b5bd
commit 2ca6df03df
2 changed files with 11 additions and 11 deletions
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13
celt/celt.c
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@ -244,11 +244,16 @@ void comb_filter(opus_val32 *y, opus_val32 *x, int T0, int T1, int N,
}
#endif /* OVERRIDE_comb_filter */
/* TF change table. Positive values mean better frequency resolution (longer
effective window), whereas negative values mean better time resolution
(shorter effective window). The second index is computed as:
4*isTransient + 2*tf_select + per_band_flag */
const signed char tf_select_table[4][8] = {
{0, -1, 0, -1, 0,-1, 0,-1},
{0, -1, 0, -2, 1, 0, 1,-1},
{0, -2, 0, -3, 2, 0, 1,-1},
{0, -2, 0, -3, 3, 0, 1,-1},
/*isTransient=0 isTransient=1 */
{0, -1, 0, -1, 0,-1, 0,-1}, /* 2.5 ms */
{0, -1, 0, -2, 1, 0, 1,-1}, /* 5 ms */
{0, -2, 0, -3, 2, 0, 1,-1}, /* 10 ms */
{0, -2, 0, -3, 3, 0, 1,-1}, /* 20 ms */
};

9
celt/celt_encoder.c
View file

@ -550,7 +550,7 @@ static opus_val32 l1_metric(const celt_norm *tmp, int N, int LM, opus_val16 bias
static int tf_analysis(const CELTMode *m, int len, int isTransient,
int *tf_res, int lambda, celt_norm *X, int N0, int LM,
int *tf_sum, opus_val16 tf_estimate, int tf_chan)
opus_val16 tf_estimate, int tf_chan)
{
int i;
VARDECL(int, metric);
@ -575,7 +575,6 @@ static int tf_analysis(const CELTMode *m, int len, int isTransient,
ALLOC(path0, len, int);
ALLOC(path1, len, int);
*tf_sum = 0;
for (i=0;i<len;i++)
{
int k, N;
@ -630,7 +629,6 @@ static int tf_analysis(const CELTMode *m, int len, int isTransient,
metric[i] = 2*best_level;
else
metric[i] = -2*best_level;
*tf_sum += (isTransient ? LM : 0) - metric[i]/2;
/* For bands that can't be split to -1, set the metric to the half-way point to avoid
biasing the decision */
if (narrow && (metric[i]==0 || metric[i]==-2*LM))
@ -1334,7 +1332,6 @@ int celt_encode_with_ec(CELTEncoder * OPUS_RESTRICT st, const opus_val16 * pcm,
int end;
int effEnd;
int codedBands;
int tf_sum;
int alloc_trim;
int pitch_index=COMBFILTER_MINPERIOD;
opus_val16 gain1 = 0;
@ -1769,18 +1766,16 @@ int celt_encode_with_ec(CELTEncoder * OPUS_RESTRICT st, const opus_val16 * pcm,
else
lambda = 3;
lambda*=2;
tf_select = tf_analysis(mode, effEnd, isTransient, tf_res, lambda, X, N, LM, &tf_sum, tf_estimate, tf_chan);
tf_select = tf_analysis(mode, effEnd, isTransient, tf_res, lambda, X, N, LM, tf_estimate, tf_chan);
for (i=effEnd;i<end;i++)
tf_res[i] = tf_res[effEnd-1];
} else if (hybrid && effectiveBytes<15)
{
/* For low bitrate hybrid, we force temporal resolution to 5 ms rather than 2.5 ms. */
tf_sum = 0;
for (i=0;i<end;i++)
tf_res[i] = 0;
tf_select=isTransient;
} else {
tf_sum = 0;
for (i=0;i<end;i++)
tf_res[i] = isTransient;
tf_select=0;