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swresample/resample: add support for odd phase_count 

because exact_rational does not guarantee
that phase_count is even

Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Muhammad Faiz <mfcc64@gmail.com>
This commit is contained in:
Muhammad Faiz 2016-06-17 05:30:37 +07:00
parent 193a421994
commit ee575acb8c
1 changed files with 8 additions and 9 deletions
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17
libswresample/resample.c
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@ -144,9 +144,10 @@ static double bessel(double x) {
static int build_filter(ResampleContext *c, void *filter, double factor, int tap_count, int alloc, int phase_count, int scale,
int filter_type, double kaiser_beta){
int ph, i;
int ph_nb = phase_count % 2 ? phase_count : phase_count / 2 + 1;
double x, y, w, t, s;
double *tab = av_malloc_array(tap_count+1, sizeof(*tab));
double *sin_lut = av_malloc_array(phase_count / 2 + 1, sizeof(*sin_lut));
double *sin_lut = av_malloc_array(ph_nb, sizeof(*sin_lut));
const int center= (tap_count-1)/2;
if (!tab || !sin_lut)
@ -156,13 +157,11 @@ static int build_filter(ResampleContext *c, void *filter, double factor, int tap
if (factor > 1.0)
factor = 1.0;
av_assert0(phase_count == 1 || phase_count % 2 == 0);
if (factor == 1.0) {
for (ph = 0; ph <= phase_count / 2; ph++)
for (ph = 0; ph < ph_nb; ph++)
sin_lut[ph] = sin(M_PI * ph / phase_count);
}
for(ph = 0; ph <= phase_count / 2; ph++) {
for(ph = 0; ph < ph_nb; ph++) {
double norm = 0;
s = sin_lut[ph];
for(i=0;i<=tap_count;i++) {
@ -203,6 +202,7 @@ static int build_filter(ResampleContext *c, void *filter, double factor, int tap
case AV_SAMPLE_FMT_S16P:
for(i=0;i<tap_count;i++)
((int16_t*)filter)[ph * alloc + i] = av_clip_int16(lrintf(tab[i] * scale / norm));
if (phase_count % 2) break;
if (tap_count % 2 == 0 || tap_count == 1) {
for (i = 0; i < tap_count; i++)
((int16_t*)filter)[(phase_count-ph) * alloc + tap_count-1-i] = ((int16_t*)filter)[ph * alloc + i];
@ -216,6 +216,7 @@ static int build_filter(ResampleContext *c, void *filter, double factor, int tap
case AV_SAMPLE_FMT_S32P:
for(i=0;i<tap_count;i++)
((int32_t*)filter)[ph * alloc + i] = av_clipl_int32(llrint(tab[i] * scale / norm));
if (phase_count % 2) break;
if (tap_count % 2 == 0 || tap_count == 1) {
for (i = 0; i < tap_count; i++)
((int32_t*)filter)[(phase_count-ph) * alloc + tap_count-1-i] = ((int32_t*)filter)[ph * alloc + i];
@ -229,6 +230,7 @@ static int build_filter(ResampleContext *c, void *filter, double factor, int tap
case AV_SAMPLE_FMT_FLTP:
for(i=0;i<tap_count;i++)
((float*)filter)[ph * alloc + i] = tab[i] * scale / norm;
if (phase_count % 2) break;
if (tap_count % 2 == 0 || tap_count == 1) {
for (i = 0; i < tap_count; i++)
((float*)filter)[(phase_count-ph) * alloc + tap_count-1-i] = ((float*)filter)[ph * alloc + i];
@ -241,6 +243,7 @@ static int build_filter(ResampleContext *c, void *filter, double factor, int tap
case AV_SAMPLE_FMT_DBLP:
for(i=0;i<tap_count;i++)
((double*)filter)[ph * alloc + i] = tab[i] * scale / norm;
if (phase_count % 2) break;
if (tap_count % 2 == 0 || tap_count == 1) {
for (i = 0; i < tap_count; i++)
((double*)filter)[(phase_count-ph) * alloc + tap_count-1-i] = ((double*)filter)[ph * alloc + i];
@ -307,10 +310,6 @@ static ResampleContext *resample_init(ResampleContext *c, int out_rate, int in_r
int phase_count_exact, phase_count_exact_den;
av_reduce(&phase_count_exact, &phase_count_exact_den, out_rate, in_rate, INT_MAX);
/* FIXME this is not required, but build_filter needs even phase_count */
if (phase_count_exact & 1 && phase_count_exact > 1 && phase_count_exact < INT_MAX/2)
phase_count_exact *= 2;
if (phase_count_exact <= phase_count) {
/* FIXME this is not required when soft compensation is disabled */
phase_count_exact *= phase_count / phase_count_exact;