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Code Issues Releases Activity

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

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Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2016-05-15 21:34:37 +02:00
parent 5afecff1ef
commit 2f76157eb0
2 changed files with 22 additions and 4 deletions
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13
libswresample/rematrix.c
View File

@ -32,6 +32,9 @@
#define TEMPLATE_REMATRIX_S16 #define TEMPLATE_REMATRIX_S16
#include "rematrix_template.c" #include "rematrix_template.c"
#define TEMPLATE_CLIP
#include "rematrix_template.c"
#undef TEMPLATE_CLIP
#undef TEMPLATE_REMATRIX_S16 #undef TEMPLATE_REMATRIX_S16
#define TEMPLATE_REMATRIX_S32 #define TEMPLATE_REMATRIX_S32
@ -367,23 +370,33 @@ av_cold int swri_rematrix_init(SwrContext *s){
return r; return r;
} }
if (s->midbuf.fmt == AV_SAMPLE_FMT_S16P){ if (s->midbuf.fmt == AV_SAMPLE_FMT_S16P){
int maxsum = 0;
s->native_matrix = av_calloc(nb_in * nb_out, sizeof(int)); s->native_matrix = av_calloc(nb_in * nb_out, sizeof(int));
s->native_one = av_mallocz(sizeof(int)); s->native_one = av_mallocz(sizeof(int));
if (!s->native_matrix || !s->native_one) if (!s->native_matrix || !s->native_one)
return AVERROR(ENOMEM); return AVERROR(ENOMEM);
for (i = 0; i < nb_out; i++) { for (i = 0; i < nb_out; i++) {
double rem = 0; double rem = 0;
int sum = 0;
for (j = 0; j < nb_in; j++) { for (j = 0; j < nb_in; j++) {
double target = s->matrix[i][j] * 32768 + rem; double target = s->matrix[i][j] * 32768 + rem;
((int*)s->native_matrix)[i * nb_in + j] = lrintf(target); ((int*)s->native_matrix)[i * nb_in + j] = lrintf(target);
rem += target - ((int*)s->native_matrix)[i * nb_in + j]; 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; *((int*)s->native_one) = 32768;
if (maxsum <= 32768) {
s->mix_1_1_f = (mix_1_1_func_type*)copy_s16; 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_2_1_f = (mix_2_1_func_type*)sum2_s16;
s->mix_any_f = (mix_any_func_type*)get_mix_any_func_s16(s); 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){ }else if(s->midbuf.fmt == AV_SAMPLE_FMT_FLTP){
s->native_matrix = av_calloc(nb_in * nb_out, sizeof(float)); s->native_matrix = av_calloc(nb_in * nb_out, sizeof(float));
s->native_one = av_mallocz(sizeof(float)); s->native_one = av_mallocz(sizeof(float));

7
libswresample/rematrix_template.c
View File

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