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swresample/rematrix: Use clipping s16 rematrixing if overflows are possible

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Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 2f76157eb0)

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2016-05-15 21:34:37 +02:00
parent 500cf2e159
commit 67c7f8ca14
2 changed files with 22 additions and 4 deletions
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19
libswresample/rematrix.c
View File

@ -32,6 +32,9 @@
#define TEMPLATE_REMATRIX_S16
#include "rematrix_template.c"
#define TEMPLATE_CLIP
#include "rematrix_template.c"
#undef TEMPLATE_CLIP
#undef TEMPLATE_REMATRIX_S16
#define TEMPLATE_REMATRIX_S32
@ -362,23 +365,33 @@ av_cold int swri_rematrix_init(SwrContext *s){
return r;
}
if (s->midbuf.fmt == AV_SAMPLE_FMT_S16P){
int maxsum = 0;
s->native_matrix = av_calloc(nb_in * nb_out, sizeof(int));
s->native_one = av_mallocz(sizeof(int));
if (!s->native_matrix || !s->native_one)
return AVERROR(ENOMEM);
for (i = 0; i < nb_out; i++) {
double rem = 0;
int sum = 0;
for (j = 0; j < nb_in; j++) {
double target = s->matrix[i][j] * 32768 + rem;
((int*)s->native_matrix)[i * nb_in + j] = lrintf(target);
rem += target - ((int*)s->native_matrix)[i * nb_in + j];
sum += FFABS(((int*)s->native_matrix)[i * nb_in + j]);
}
maxsum = FFMAX(maxsum, sum);
}
*((int*)s->native_one) = 32768;
s->mix_1_1_f = (mix_1_1_func_type*)copy_s16;
s->mix_2_1_f = (mix_2_1_func_type*)sum2_s16;
s->mix_any_f = (mix_any_func_type*)get_mix_any_func_s16(s);
if (maxsum <= 32768) {
s->mix_1_1_f = (mix_1_1_func_type*)copy_s16;
s->mix_2_1_f = (mix_2_1_func_type*)sum2_s16;
s->mix_any_f = (mix_any_func_type*)get_mix_any_func_s16(s);
} else {
s->mix_1_1_f = (mix_1_1_func_type*)copy_clip_s16;
s->mix_2_1_f = (mix_2_1_func_type*)sum2_clip_s16;
s->mix_any_f = (mix_any_func_type*)get_mix_any_func_clip_s16(s);
}
}else if(s->midbuf.fmt == AV_SAMPLE_FMT_FLTP){
s->native_matrix = av_calloc(nb_in * nb_out, sizeof(float));
s->native_one = av_mallocz(sizeof(float));

7
libswresample/rematrix_template.c
View File

@ -31,11 +31,16 @@
# define INTER double
# define RENAME(x) x ## _double
#elif defined(TEMPLATE_REMATRIX_S16)
# define R(x) (((x) + 16384)>>15)
# define SAMPLE int16_t
# define COEFF int
# define INTER int
# ifdef TEMPLATE_CLIP
# define R(x) av_clip_int16(((x) + 16384)>>15)
# define RENAME(x) x ## _clip_s16
# else
# define R(x) (((x) + 16384)>>15)
# define RENAME(x) x ## _s16
# endif
#elif defined(TEMPLATE_REMATRIX_S32)
# define R(x) (((x) + 16384)>>15)
# define SAMPLE int32_t