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audio-resampler: avoid overflow in cubic interpolation

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Shift out an extra bit to have some more headroom when doing cubic
interpolation.
This commit is contained in:
Wim Taymans 2016-02-24 12:57:26 +01:00
parent 61460fdfad
commit 6dd5e5259f
1 changed files with 11 additions and 6 deletions
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17
gst-libs/gst/audio/audio-resampler-x86.h
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@ -240,10 +240,10 @@ inner_product_gint16_cubic_1_sse2 (gint16 * o, const gint16 * a,
sum[2] = _mm_add_epi32 (sum[2], _mm_madd_epi16 (t, _mm_load_si128 ((__m128i *) (c[2] + i))));
sum[3] = _mm_add_epi32 (sum[3], _mm_madd_epi16 (t, _mm_load_si128 ((__m128i *) (c[3] + i))));
}
sum[0] = _mm_srai_epi32 (sum[0], PRECISION_S16);
sum[1] = _mm_srai_epi32 (sum[1], PRECISION_S16);
sum[2] = _mm_srai_epi32 (sum[2], PRECISION_S16);
sum[3] = _mm_srai_epi32 (sum[3], PRECISION_S16);
sum[0] = _mm_srai_epi32 (sum[0], PRECISION_S16+1);
sum[1] = _mm_srai_epi32 (sum[1], PRECISION_S16+1);
sum[2] = _mm_srai_epi32 (sum[2], PRECISION_S16+1);
sum[3] = _mm_srai_epi32 (sum[3], PRECISION_S16+1);
sum[0] = _mm_madd_epi16 (sum[0], _mm_shuffle_epi32 (f, _MM_SHUFFLE (0, 0, 0, 0)));
sum[1] = _mm_madd_epi16 (sum[1], _mm_shuffle_epi32 (f, _MM_SHUFFLE (1, 1, 1, 1)));
@ -256,8 +256,8 @@ inner_product_gint16_cubic_1_sse2 (gint16 * o, const gint16 * a,
sum[0] = _mm_add_epi32 (sum[0], _mm_shuffle_epi32 (sum[0], _MM_SHUFFLE (2, 3, 2, 3)));
sum[0] = _mm_add_epi32 (sum[0], _mm_shuffle_epi32 (sum[0], _MM_SHUFFLE (1, 1, 1, 1)));
sum[0] = _mm_add_epi32 (sum[0], _mm_set1_epi32 (1 << (PRECISION_S16 - 1)));
sum[0] = _mm_srai_epi32 (sum[0], PRECISION_S16);
sum[0] = _mm_add_epi32 (sum[0], _mm_set1_epi32 (1 << (PRECISION_S16 - 2)));
sum[0] = _mm_srai_epi32 (sum[0], PRECISION_S16-1);
sum[0] = _mm_packs_epi32 (sum[0], sum[0]);
*o = _mm_extract_epi16 (sum[0], 0);
}
@ -484,6 +484,11 @@ interpolate_gdouble_cubic_sse2 (gpointer op, const gpointer ap,
#endif
#if 0
#define __SSE4_1__
#pragma GCC target("sse4.1")
#endif
#if defined (HAVE_SMMINTRIN_H) && defined(__SSE4_1__)
#include <smmintrin.h>