| /* |
| Simple DirectMedia Layer |
| Copyright (C) 1997-2017 Sam Lantinga <slouken@libsdl.org> |
| |
| This software is provided 'as-is', without any express or implied |
| warranty. In no event will the authors be held liable for any damages |
| arising from the use of this software. |
| |
| Permission is granted to anyone to use this software for any purpose, |
| including commercial applications, and to alter it and redistribute it |
| freely, subject to the following restrictions: |
| |
| 1. The origin of this software must not be misrepresented; you must not |
| claim that you wrote the original software. If you use this software |
| in a product, an acknowledgment in the product documentation would be |
| appreciated but is not required. |
| 2. Altered source versions must be plainly marked as such, and must not be |
| misrepresented as being the original software. |
| 3. This notice may not be removed or altered from any source distribution. |
| */ |
| |
| #include "../SDL_internal.h" |
| #include "SDL_audio.h" |
| #include "SDL_audio_c.h" |
| #include "SDL_cpuinfo.h" |
| #include "SDL_assert.h" |
| |
| /* !!! FIXME: write NEON code. */ |
| #define HAVE_NEON_INTRINSICS 0 |
| |
| #ifdef __SSE2__ |
| #define HAVE_SSE2_INTRINSICS 1 |
| #endif |
| |
| #if defined(__x86_64__) && HAVE_SSE2_INTRINSICS |
| #define NEED_SCALAR_CONVERTER_FALLBACKS 0 /* x86_64 guarantees SSE2. */ |
| #elif __MACOSX__ && HAVE_SSE2_INTRINSICS |
| #define NEED_SCALAR_CONVERTER_FALLBACKS 0 /* Mac OS X/Intel guarantees SSE2. */ |
| #elif defined(__ARM_ARCH) && (__ARM_ARCH >= 8) && HAVE_NEON_INTRINSICS |
| #define NEED_SCALAR_CONVERTER_FALLBACKS 0 /* ARMv8+ promise NEON. */ |
| #elif defined(__APPLE__) && defined(__ARM_ARCH) && (__ARM_ARCH >= 7) && HAVE_NEON_INTRINSICS |
| #define NEED_SCALAR_CONVERTER_FALLBACKS 0 /* All Apple ARMv7 chips promise NEON support. */ |
| #endif |
| |
| /* Set to zero if platform is guaranteed to use a SIMD codepath here. */ |
| #ifndef NEED_SCALAR_CONVERTER_FALLBACKS |
| #define NEED_SCALAR_CONVERTER_FALLBACKS 1 |
| #endif |
| |
| /* Function pointers set to a CPU-specific implementation. */ |
| SDL_AudioFilter SDL_Convert_S8_to_F32 = NULL; |
| SDL_AudioFilter SDL_Convert_U8_to_F32 = NULL; |
| SDL_AudioFilter SDL_Convert_S16_to_F32 = NULL; |
| SDL_AudioFilter SDL_Convert_U16_to_F32 = NULL; |
| SDL_AudioFilter SDL_Convert_S32_to_F32 = NULL; |
| SDL_AudioFilter SDL_Convert_F32_to_S8 = NULL; |
| SDL_AudioFilter SDL_Convert_F32_to_U8 = NULL; |
| SDL_AudioFilter SDL_Convert_F32_to_S16 = NULL; |
| SDL_AudioFilter SDL_Convert_F32_to_U16 = NULL; |
| SDL_AudioFilter SDL_Convert_F32_to_S32 = NULL; |
| |
| |
| #define DIVBY127 0.0078740157480315f |
| #define DIVBY32767 3.05185094759972e-05f |
| #define DIVBY2147483647 4.6566128752458e-10f |
| |
| |
| #if NEED_SCALAR_CONVERTER_FALLBACKS |
| static void SDLCALL |
| SDL_Convert_S8_to_F32_Scalar(SDL_AudioCVT *cvt, SDL_AudioFormat format) |
| { |
| const Sint8 *src = ((const Sint8 *) (cvt->buf + cvt->len_cvt)) - 1; |
| float *dst = ((float *) (cvt->buf + cvt->len_cvt * 4)) - 1; |
| int i; |
| |
| LOG_DEBUG_CONVERT("AUDIO_S8", "AUDIO_F32"); |
| |
| for (i = cvt->len_cvt; i; --i, --src, --dst) { |
| *dst = (((float) *src) * DIVBY127); |
| } |
| |
| cvt->len_cvt *= 4; |
| if (cvt->filters[++cvt->filter_index]) { |
| cvt->filters[cvt->filter_index](cvt, AUDIO_F32SYS); |
| } |
| } |
| |
| static void SDLCALL |
| SDL_Convert_U8_to_F32_Scalar(SDL_AudioCVT *cvt, SDL_AudioFormat format) |
| { |
| const Uint8 *src = ((const Uint8 *) (cvt->buf + cvt->len_cvt)) - 1; |
| float *dst = ((float *) (cvt->buf + cvt->len_cvt * 4)) - 1; |
| int i; |
| |
| LOG_DEBUG_CONVERT("AUDIO_U8", "AUDIO_F32"); |
| |
| for (i = cvt->len_cvt; i; --i, --src, --dst) { |
| *dst = ((((float) *src) * DIVBY127) - 1.0f); |
| } |
| |
| cvt->len_cvt *= 4; |
| if (cvt->filters[++cvt->filter_index]) { |
| cvt->filters[cvt->filter_index](cvt, AUDIO_F32SYS); |
| } |
| } |
| |
| static void SDLCALL |
| SDL_Convert_S16_to_F32_Scalar(SDL_AudioCVT *cvt, SDL_AudioFormat format) |
| { |
| const Sint16 *src = ((const Sint16 *) (cvt->buf + cvt->len_cvt)) - 1; |
| float *dst = ((float *) (cvt->buf + cvt->len_cvt * 2)) - 1; |
| int i; |
| |
| LOG_DEBUG_CONVERT("AUDIO_S16", "AUDIO_F32"); |
| |
| for (i = cvt->len_cvt / sizeof (Sint16); i; --i, --src, --dst) { |
| *dst = (((float) *src) * DIVBY32767); |
| } |
| |
| cvt->len_cvt *= 2; |
| if (cvt->filters[++cvt->filter_index]) { |
| cvt->filters[cvt->filter_index](cvt, AUDIO_F32SYS); |
| } |
| } |
| |
| static void SDLCALL |
| SDL_Convert_U16_to_F32_Scalar(SDL_AudioCVT *cvt, SDL_AudioFormat format) |
| { |
| const Uint16 *src = ((const Uint16 *) (cvt->buf + cvt->len_cvt)) - 1; |
| float *dst = ((float *) (cvt->buf + cvt->len_cvt * 2)) - 1; |
| int i; |
| |
| LOG_DEBUG_CONVERT("AUDIO_U16", "AUDIO_F32"); |
| |
| for (i = cvt->len_cvt / sizeof (Uint16); i; --i, --src, --dst) { |
| *dst = ((((float) *src) * DIVBY32767) - 1.0f); |
| } |
| |
| cvt->len_cvt *= 2; |
| if (cvt->filters[++cvt->filter_index]) { |
| cvt->filters[cvt->filter_index](cvt, AUDIO_F32SYS); |
| } |
| } |
| |
| static void SDLCALL |
| SDL_Convert_S32_to_F32_Scalar(SDL_AudioCVT *cvt, SDL_AudioFormat format) |
| { |
| const Sint32 *src = (const Sint32 *) cvt->buf; |
| float *dst = (float *) cvt->buf; |
| int i; |
| |
| LOG_DEBUG_CONVERT("AUDIO_S32", "AUDIO_F32"); |
| |
| for (i = cvt->len_cvt / sizeof (Sint32); i; --i, ++src, ++dst) { |
| *dst = (float) (((double) *src) * DIVBY2147483647); |
| } |
| |
| if (cvt->filters[++cvt->filter_index]) { |
| cvt->filters[cvt->filter_index](cvt, AUDIO_F32SYS); |
| } |
| } |
| |
| static void SDLCALL |
| SDL_Convert_F32_to_S8_Scalar(SDL_AudioCVT *cvt, SDL_AudioFormat format) |
| { |
| const float *src = (const float *) cvt->buf; |
| Sint8 *dst = (Sint8 *) cvt->buf; |
| int i; |
| |
| LOG_DEBUG_CONVERT("AUDIO_F32", "AUDIO_S8"); |
| |
| for (i = cvt->len_cvt / sizeof (float); i; --i, ++src, ++dst) { |
| *dst = (Sint8) (*src * 127.0f); |
| } |
| |
| cvt->len_cvt /= 4; |
| if (cvt->filters[++cvt->filter_index]) { |
| cvt->filters[cvt->filter_index](cvt, AUDIO_S8); |
| } |
| } |
| |
| static void SDLCALL |
| SDL_Convert_F32_to_U8_Scalar(SDL_AudioCVT *cvt, SDL_AudioFormat format) |
| { |
| const float *src = (const float *) cvt->buf; |
| Uint8 *dst = (Uint8 *) cvt->buf; |
| int i; |
| |
| LOG_DEBUG_CONVERT("AUDIO_F32", "AUDIO_U8"); |
| |
| for (i = cvt->len_cvt / sizeof (float); i; --i, ++src, ++dst) { |
| *dst = (Uint8) ((*src + 1.0f) * 127.0f); |
| } |
| |
| cvt->len_cvt /= 4; |
| if (cvt->filters[++cvt->filter_index]) { |
| cvt->filters[cvt->filter_index](cvt, AUDIO_U8); |
| } |
| } |
| |
| static void SDLCALL |
| SDL_Convert_F32_to_S16_Scalar(SDL_AudioCVT *cvt, SDL_AudioFormat format) |
| { |
| const float *src = (const float *) cvt->buf; |
| Sint16 *dst = (Sint16 *) cvt->buf; |
| int i; |
| |
| LOG_DEBUG_CONVERT("AUDIO_F32", "AUDIO_S16"); |
| |
| for (i = cvt->len_cvt / sizeof (float); i; --i, ++src, ++dst) { |
| *dst = (Sint16) (*src * 32767.0f); |
| } |
| |
| cvt->len_cvt /= 2; |
| if (cvt->filters[++cvt->filter_index]) { |
| cvt->filters[cvt->filter_index](cvt, AUDIO_S16SYS); |
| } |
| } |
| |
| static void SDLCALL |
| SDL_Convert_F32_to_U16_Scalar(SDL_AudioCVT *cvt, SDL_AudioFormat format) |
| { |
| const float *src = (const float *) cvt->buf; |
| Uint16 *dst = (Uint16 *) cvt->buf; |
| int i; |
| |
| LOG_DEBUG_CONVERT("AUDIO_F32", "AUDIO_U16"); |
| |
| for (i = cvt->len_cvt / sizeof (float); i; --i, ++src, ++dst) { |
| *dst = (Uint16) ((*src + 1.0f) * 32767.0f); |
| } |
| |
| cvt->len_cvt /= 2; |
| if (cvt->filters[++cvt->filter_index]) { |
| cvt->filters[cvt->filter_index](cvt, AUDIO_U16SYS); |
| } |
| } |
| |
| static void SDLCALL |
| SDL_Convert_F32_to_S32_Scalar(SDL_AudioCVT *cvt, SDL_AudioFormat format) |
| { |
| const float *src = (const float *) cvt->buf; |
| Sint32 *dst = (Sint32 *) cvt->buf; |
| int i; |
| |
| LOG_DEBUG_CONVERT("AUDIO_F32", "AUDIO_S32"); |
| |
| for (i = cvt->len_cvt / sizeof (float); i; --i, ++src, ++dst) { |
| *dst = (Sint32) (((double) *src) * 2147483647.0); |
| } |
| |
| if (cvt->filters[++cvt->filter_index]) { |
| cvt->filters[cvt->filter_index](cvt, AUDIO_S32SYS); |
| } |
| } |
| #endif |
| |
| |
| #if HAVE_SSE2_INTRINSICS |
| static void SDLCALL |
| SDL_Convert_S8_to_F32_SSE2(SDL_AudioCVT *cvt, SDL_AudioFormat format) |
| { |
| const Sint8 *src = ((const Sint8 *) (cvt->buf + cvt->len_cvt)) - 1; |
| float *dst = ((float *) (cvt->buf + cvt->len_cvt * 4)) - 1; |
| int i; |
| |
| LOG_DEBUG_CONVERT("AUDIO_S8", "AUDIO_F32 (using SSE2)"); |
| |
| /* Get dst aligned to 16 bytes (since buffer is growing, we don't have to worry about overreading from src) */ |
| for (i = cvt->len_cvt; i && (((size_t) (dst-15)) & 15); --i, --src, --dst) { |
| *dst = (((float) *src) * DIVBY127); |
| } |
| |
| src -= 15; dst -= 15; /* adjust to read SSE blocks from the start. */ |
| SDL_assert(!i || ((((size_t) dst) & 15) == 0)); |
| |
| /* Make sure src is aligned too. */ |
| if ((((size_t) src) & 15) == 0) { |
| /* Aligned! Do SSE blocks as long as we have 16 bytes available. */ |
| const __m128i *mmsrc = (const __m128i *) src; |
| const __m128i zero = _mm_setzero_si128(); |
| const __m128 divby127 = _mm_set1_ps(DIVBY127); |
| while (i >= 16) { /* 16 * 8-bit */ |
| const __m128i bytes = _mm_load_si128(mmsrc); /* get 16 sint8 into an XMM register. */ |
| /* treat as int16, shift left to clear every other sint16, then back right with sign-extend. Now sint16. */ |
| const __m128i shorts1 = _mm_srai_epi16(_mm_slli_epi16(bytes, 8), 8); |
| /* right-shift-sign-extend gets us sint16 with the other set of values. */ |
| const __m128i shorts2 = _mm_srai_epi16(bytes, 8); |
| /* unpack against zero to make these int32, shift to make them sign-extend, convert to float, multiply. Whew! */ |
| const __m128 floats1 = _mm_mul_ps(_mm_cvtepi32_ps(_mm_srai_epi32(_mm_slli_epi32(_mm_unpacklo_epi16(shorts1, zero), 16), 16)), divby127); |
| const __m128 floats2 = _mm_mul_ps(_mm_cvtepi32_ps(_mm_srai_epi32(_mm_slli_epi32(_mm_unpacklo_epi16(shorts2, zero), 16), 16)), divby127); |
| const __m128 floats3 = _mm_mul_ps(_mm_cvtepi32_ps(_mm_srai_epi32(_mm_slli_epi32(_mm_unpackhi_epi16(shorts1, zero), 16), 16)), divby127); |
| const __m128 floats4 = _mm_mul_ps(_mm_cvtepi32_ps(_mm_srai_epi32(_mm_slli_epi32(_mm_unpackhi_epi16(shorts2, zero), 16), 16)), divby127); |
| /* Interleave back into correct order, store. */ |
| _mm_store_ps(dst, _mm_unpacklo_ps(floats1, floats2)); |
| _mm_store_ps(dst+4, _mm_unpackhi_ps(floats1, floats2)); |
| _mm_store_ps(dst+8, _mm_unpacklo_ps(floats3, floats4)); |
| _mm_store_ps(dst+12, _mm_unpackhi_ps(floats3, floats4)); |
| i -= 16; mmsrc--; dst -= 16; |
| } |
| |
| src = (const Sint8 *) mmsrc; |
| } |
| |
| src += 15; dst += 15; /* adjust for any scalar finishing. */ |
| |
| /* Finish off any leftovers with scalar operations. */ |
| while (i) { |
| *dst = (((float) *src) * DIVBY127); |
| i--; src--; dst--; |
| } |
| |
| cvt->len_cvt *= 4; |
| if (cvt->filters[++cvt->filter_index]) { |
| cvt->filters[cvt->filter_index](cvt, AUDIO_F32SYS); |
| } |
| } |
| |
| static void SDLCALL |
| SDL_Convert_U8_to_F32_SSE2(SDL_AudioCVT *cvt, SDL_AudioFormat format) |
| { |
| const Uint8 *src = ((const Uint8 *) (cvt->buf + cvt->len_cvt)) - 1; |
| float *dst = ((float *) (cvt->buf + cvt->len_cvt * 4)) - 1; |
| int i; |
| |
| LOG_DEBUG_CONVERT("AUDIO_U8", "AUDIO_F32 (using SSE2)"); |
| |
| /* Get dst aligned to 16 bytes (since buffer is growing, we don't have to worry about overreading from src) */ |
| for (i = cvt->len_cvt; i && (((size_t) (dst-15)) & 15); --i, --src, --dst) { |
| *dst = ((((float) *src) * DIVBY127) - 1.0f); |
| } |
| |
| src -= 15; dst -= 15; /* adjust to read SSE blocks from the start. */ |
| SDL_assert(!i || ((((size_t) dst) & 15) == 0)); |
| |
| /* Make sure src is aligned too. */ |
| if ((((size_t) src) & 15) == 0) { |
| /* Aligned! Do SSE blocks as long as we have 16 bytes available. */ |
| const __m128i *mmsrc = (const __m128i *) src; |
| const __m128i zero = _mm_setzero_si128(); |
| const __m128 divby127 = _mm_set1_ps(DIVBY127); |
| const __m128 minus1 = _mm_set1_ps(-1.0f); |
| while (i >= 16) { /* 16 * 8-bit */ |
| const __m128i bytes = _mm_load_si128(mmsrc); /* get 16 uint8 into an XMM register. */ |
| /* treat as int16, shift left to clear every other sint16, then back right with zero-extend. Now uint16. */ |
| const __m128i shorts1 = _mm_srli_epi16(_mm_slli_epi16(bytes, 8), 8); |
| /* right-shift-zero-extend gets us uint16 with the other set of values. */ |
| const __m128i shorts2 = _mm_srli_epi16(bytes, 8); |
| /* unpack against zero to make these int32, convert to float, multiply, add. Whew! */ |
| /* Note that AVX2 can do floating point multiply+add in one instruction, fwiw. SSE2 cannot. */ |
| const __m128 floats1 = _mm_add_ps(_mm_mul_ps(_mm_cvtepi32_ps(_mm_unpacklo_epi16(shorts1, zero)), divby127), minus1); |
| const __m128 floats2 = _mm_add_ps(_mm_mul_ps(_mm_cvtepi32_ps(_mm_unpacklo_epi16(shorts2, zero)), divby127), minus1); |
| const __m128 floats3 = _mm_add_ps(_mm_mul_ps(_mm_cvtepi32_ps(_mm_unpackhi_epi16(shorts1, zero)), divby127), minus1); |
| const __m128 floats4 = _mm_add_ps(_mm_mul_ps(_mm_cvtepi32_ps(_mm_unpackhi_epi16(shorts2, zero)), divby127), minus1); |
| /* Interleave back into correct order, store. */ |
| _mm_store_ps(dst, _mm_unpacklo_ps(floats1, floats2)); |
| _mm_store_ps(dst+4, _mm_unpackhi_ps(floats1, floats2)); |
| _mm_store_ps(dst+8, _mm_unpacklo_ps(floats3, floats4)); |
| _mm_store_ps(dst+12, _mm_unpackhi_ps(floats3, floats4)); |
| i -= 16; mmsrc--; dst -= 16; |
| } |
| |
| src = (const Uint8 *) mmsrc; |
| } |
| |
| src += 15; dst += 15; /* adjust for any scalar finishing. */ |
| |
| /* Finish off any leftovers with scalar operations. */ |
| while (i) { |
| *dst = ((((float) *src) * DIVBY127) - 1.0f); |
| i--; src--; dst--; |
| } |
| |
| cvt->len_cvt *= 4; |
| if (cvt->filters[++cvt->filter_index]) { |
| cvt->filters[cvt->filter_index](cvt, AUDIO_F32SYS); |
| } |
| } |
| |
| static void SDLCALL |
| SDL_Convert_S16_to_F32_SSE2(SDL_AudioCVT *cvt, SDL_AudioFormat format) |
| { |
| const Sint16 *src = ((const Sint16 *) (cvt->buf + cvt->len_cvt)) - 1; |
| float *dst = ((float *) (cvt->buf + cvt->len_cvt * 2)) - 1; |
| int i; |
| |
| LOG_DEBUG_CONVERT("AUDIO_S16", "AUDIO_F32 (using SSE2)"); |
| |
| /* Get dst aligned to 16 bytes (since buffer is growing, we don't have to worry about overreading from src) */ |
| for (i = cvt->len_cvt / sizeof (Sint16); i && (((size_t) (dst-7)) & 15); --i, --src, --dst) { |
| *dst = (((float) *src) * DIVBY32767); |
| } |
| |
| src -= 7; dst -= 7; /* adjust to read SSE blocks from the start. */ |
| SDL_assert(!i || ((((size_t) dst) & 15) == 0)); |
| |
| /* Make sure src is aligned too. */ |
| if ((((size_t) src) & 15) == 0) { |
| /* Aligned! Do SSE blocks as long as we have 16 bytes available. */ |
| const __m128 divby32767 = _mm_set1_ps(DIVBY32767); |
| while (i >= 8) { /* 8 * 16-bit */ |
| const __m128i ints = _mm_load_si128((__m128i const *) src); /* get 8 sint16 into an XMM register. */ |
| /* treat as int32, shift left to clear every other sint16, then back right with sign-extend. Now sint32. */ |
| const __m128i a = _mm_srai_epi32(_mm_slli_epi32(ints, 16), 16); |
| /* right-shift-sign-extend gets us sint32 with the other set of values. */ |
| const __m128i b = _mm_srai_epi32(ints, 16); |
| /* Interleave these back into the right order, convert to float, multiply, store. */ |
| _mm_store_ps(dst, _mm_mul_ps(_mm_cvtepi32_ps(_mm_unpacklo_epi32(a, b)), divby32767)); |
| _mm_store_ps(dst+4, _mm_mul_ps(_mm_cvtepi32_ps(_mm_unpackhi_epi32(a, b)), divby32767)); |
| i -= 8; src -= 8; dst -= 8; |
| } |
| } |
| |
| src += 7; dst += 7; /* adjust for any scalar finishing. */ |
| |
| /* Finish off any leftovers with scalar operations. */ |
| while (i) { |
| *dst = (((float) *src) * DIVBY32767); |
| i--; src--; dst--; |
| } |
| |
| cvt->len_cvt *= 2; |
| if (cvt->filters[++cvt->filter_index]) { |
| cvt->filters[cvt->filter_index](cvt, AUDIO_F32SYS); |
| } |
| } |
| |
| static void SDLCALL |
| SDL_Convert_U16_to_F32_SSE2(SDL_AudioCVT *cvt, SDL_AudioFormat format) |
| { |
| const Uint16 *src = ((const Uint16 *) (cvt->buf + cvt->len_cvt)) - 1; |
| float *dst = ((float *) (cvt->buf + cvt->len_cvt * 2)) - 1; |
| int i; |
| |
| LOG_DEBUG_CONVERT("AUDIO_U16", "AUDIO_F32 (using SSE2)"); |
| |
| /* Get dst aligned to 16 bytes (since buffer is growing, we don't have to worry about overreading from src) */ |
| for (i = cvt->len_cvt / sizeof (Sint16); i && (((size_t) (dst-7)) & 15); --i, --src, --dst) { |
| *dst = ((((float) *src) * DIVBY32767) - 1.0f); |
| } |
| |
| src -= 7; dst -= 7; /* adjust to read SSE blocks from the start. */ |
| SDL_assert(!i || ((((size_t) dst) & 15) == 0)); |
| |
| /* Make sure src is aligned too. */ |
| if ((((size_t) src) & 15) == 0) { |
| /* Aligned! Do SSE blocks as long as we have 16 bytes available. */ |
| const __m128 divby32767 = _mm_set1_ps(DIVBY32767); |
| const __m128 minus1 = _mm_set1_ps(1.0f); |
| while (i >= 8) { /* 8 * 16-bit */ |
| const __m128i ints = _mm_load_si128((__m128i const *) src); /* get 8 sint16 into an XMM register. */ |
| /* treat as int32, shift left to clear every other sint16, then back right with zero-extend. Now sint32. */ |
| const __m128i a = _mm_srli_epi32(_mm_slli_epi32(ints, 16), 16); |
| /* right-shift-sign-extend gets us sint32 with the other set of values. */ |
| const __m128i b = _mm_srli_epi32(ints, 16); |
| /* Interleave these back into the right order, convert to float, multiply, store. */ |
| _mm_store_ps(dst, _mm_add_ps(_mm_mul_ps(_mm_cvtepi32_ps(_mm_unpacklo_epi32(a, b)), divby32767), minus1)); |
| _mm_store_ps(dst+4, _mm_add_ps(_mm_mul_ps(_mm_cvtepi32_ps(_mm_unpackhi_epi32(a, b)), divby32767), minus1)); |
| i -= 8; src -= 8; dst -= 8; |
| } |
| } |
| |
| src += 7; dst += 7; /* adjust for any scalar finishing. */ |
| |
| /* Finish off any leftovers with scalar operations. */ |
| while (i) { |
| *dst = ((((float) *src) * DIVBY32767) - 1.0f); |
| i--; src--; dst--; |
| } |
| |
| cvt->len_cvt *= 2; |
| if (cvt->filters[++cvt->filter_index]) { |
| cvt->filters[cvt->filter_index](cvt, AUDIO_F32SYS); |
| } |
| } |
| |
| static void SDLCALL |
| SDL_Convert_S32_to_F32_SSE2(SDL_AudioCVT *cvt, SDL_AudioFormat format) |
| { |
| const Sint32 *src = (const Sint32 *) cvt->buf; |
| float *dst = (float *) cvt->buf; |
| int i; |
| |
| LOG_DEBUG_CONVERT("AUDIO_S32", "AUDIO_F32 (using SSE2)"); |
| |
| /* Get dst aligned to 16 bytes */ |
| for (i = cvt->len_cvt / sizeof (Sint32); i && (((size_t) dst) & 15); --i, ++src, ++dst) { |
| *dst = (float) (((double) *src) * DIVBY2147483647); |
| } |
| |
| SDL_assert(!i || ((((size_t) dst) & 15) == 0)); |
| SDL_assert(!i || ((((size_t) src) & 15) == 0)); |
| |
| { |
| /* Aligned! Do SSE blocks as long as we have 16 bytes available. */ |
| const __m128d divby2147483647 = _mm_set1_pd(DIVBY2147483647); |
| const __m128i *mmsrc = (const __m128i *) src; |
| while (i >= 4) { /* 4 * sint32 */ |
| const __m128i ints = _mm_load_si128(mmsrc); |
| /* bitshift the whole register over, so _mm_cvtepi32_pd can read the top ints in the bottom of the vector. */ |
| const __m128d doubles1 = _mm_mul_pd(_mm_cvtepi32_pd(_mm_srli_si128(ints, 8)), divby2147483647); |
| const __m128d doubles2 = _mm_mul_pd(_mm_cvtepi32_pd(ints), divby2147483647); |
| /* convert to float32, bitshift/or to get these into a vector to store. */ |
| _mm_store_ps(dst, _mm_castsi128_ps(_mm_or_si128(_mm_slli_si128(_mm_castps_si128(_mm_cvtpd_ps(doubles1)), 8), _mm_castps_si128(_mm_cvtpd_ps(doubles2))))); |
| i -= 4; mmsrc++; dst += 4; |
| } |
| src = (const Sint32 *) mmsrc; |
| } |
| |
| /* Finish off any leftovers with scalar operations. */ |
| while (i) { |
| *dst = (float) (((double) *src) * DIVBY2147483647); |
| i--; src++; dst++; |
| } |
| |
| if (cvt->filters[++cvt->filter_index]) { |
| cvt->filters[cvt->filter_index](cvt, AUDIO_F32SYS); |
| } |
| } |
| |
| static void SDLCALL |
| SDL_Convert_F32_to_S8_SSE2(SDL_AudioCVT *cvt, SDL_AudioFormat format) |
| { |
| const float *src = (const float *) cvt->buf; |
| Sint8 *dst = (Sint8 *) cvt->buf; |
| int i; |
| |
| LOG_DEBUG_CONVERT("AUDIO_F32", "AUDIO_S8 (using SSE2)"); |
| |
| /* Get dst aligned to 16 bytes */ |
| for (i = cvt->len_cvt / sizeof (float); i && (((size_t) dst) & 15); --i, ++src, ++dst) { |
| *dst = (Sint8) (*src * 127.0f); |
| } |
| |
| SDL_assert(!i || ((((size_t) dst) & 15) == 0)); |
| |
| /* Make sure src is aligned too. */ |
| if ((((size_t) src) & 15) == 0) { |
| /* Aligned! Do SSE blocks as long as we have 16 bytes available. */ |
| const __m128 mulby127 = _mm_set1_ps(127.0f); |
| __m128i *mmdst = (__m128i *) dst; |
| while (i >= 16) { /* 16 * float32 */ |
| const __m128i ints1 = _mm_cvtps_epi32(_mm_mul_ps(_mm_load_ps(src), mulby127)); /* load 4 floats, convert to sint32 */ |
| const __m128i ints2 = _mm_cvtps_epi32(_mm_mul_ps(_mm_load_ps(src+4), mulby127)); /* load 4 floats, convert to sint32 */ |
| const __m128i ints3 = _mm_cvtps_epi32(_mm_mul_ps(_mm_load_ps(src+8), mulby127)); /* load 4 floats, convert to sint32 */ |
| const __m128i ints4 = _mm_cvtps_epi32(_mm_mul_ps(_mm_load_ps(src+12), mulby127)); /* load 4 floats, convert to sint32 */ |
| _mm_store_si128(mmdst, _mm_packs_epi16(_mm_packs_epi32(ints1, ints2), _mm_packs_epi32(ints3, ints4))); /* pack down, store out. */ |
| i -= 16; src += 16; mmdst++; |
| } |
| dst = (Sint8 *) mmdst; |
| } |
| |
| /* Finish off any leftovers with scalar operations. */ |
| while (i) { |
| *dst = (Sint8) (*src * 127.0f); |
| i--; src++; dst++; |
| } |
| |
| cvt->len_cvt /= 4; |
| if (cvt->filters[++cvt->filter_index]) { |
| cvt->filters[cvt->filter_index](cvt, AUDIO_S8); |
| } |
| } |
| |
| static void SDLCALL |
| SDL_Convert_F32_to_U8_SSE2(SDL_AudioCVT *cvt, SDL_AudioFormat format) |
| { |
| const float *src = (const float *) cvt->buf; |
| Uint8 *dst = (Uint8 *) cvt->buf; |
| int i; |
| |
| LOG_DEBUG_CONVERT("AUDIO_F32", "AUDIO_U8 (using SSE2)"); |
| |
| /* Get dst aligned to 16 bytes */ |
| for (i = cvt->len_cvt / sizeof (float); i && (((size_t) dst) & 15); --i, ++src, ++dst) { |
| *dst = (Uint8) ((*src + 1.0f) * 127.0f); |
| } |
| |
| SDL_assert(!i || ((((size_t) dst) & 15) == 0)); |
| |
| /* Make sure src is aligned too. */ |
| if ((((size_t) src) & 15) == 0) { |
| /* Aligned! Do SSE blocks as long as we have 16 bytes available. */ |
| const __m128 add1 = _mm_set1_ps(1.0f); |
| const __m128 mulby127 = _mm_set1_ps(127.0f); |
| __m128i *mmdst = (__m128i *) dst; |
| while (i >= 16) { /* 16 * float32 */ |
| const __m128i ints1 = _mm_cvtps_epi32(_mm_mul_ps(_mm_add_ps(_mm_load_ps(src), add1), mulby127)); /* load 4 floats, convert to sint32 */ |
| const __m128i ints2 = _mm_cvtps_epi32(_mm_mul_ps(_mm_add_ps(_mm_load_ps(src+4), add1), mulby127)); /* load 4 floats, convert to sint32 */ |
| const __m128i ints3 = _mm_cvtps_epi32(_mm_mul_ps(_mm_add_ps(_mm_load_ps(src+8), add1), mulby127)); /* load 4 floats, convert to sint32 */ |
| const __m128i ints4 = _mm_cvtps_epi32(_mm_mul_ps(_mm_add_ps(_mm_load_ps(src+12), add1), mulby127)); /* load 4 floats, convert to sint32 */ |
| _mm_store_si128(mmdst, _mm_packus_epi16(_mm_packs_epi32(ints1, ints2), _mm_packs_epi32(ints3, ints4))); /* pack down, store out. */ |
| i -= 16; src += 16; mmdst++; |
| } |
| dst = (Uint8 *) mmdst; |
| } |
| |
| /* Finish off any leftovers with scalar operations. */ |
| while (i) { |
| *dst = (Uint8) ((*src + 1.0f) * 127.0f); |
| i--; src++; dst++; |
| } |
| |
| cvt->len_cvt /= 4; |
| if (cvt->filters[++cvt->filter_index]) { |
| cvt->filters[cvt->filter_index](cvt, AUDIO_U8); |
| } |
| } |
| |
| static void SDLCALL |
| SDL_Convert_F32_to_S16_SSE2(SDL_AudioCVT *cvt, SDL_AudioFormat format) |
| { |
| const float *src = (const float *) cvt->buf; |
| Sint16 *dst = (Sint16 *) cvt->buf; |
| int i; |
| |
| LOG_DEBUG_CONVERT("AUDIO_F32", "AUDIO_S16 (using SSE2)"); |
| |
| /* Get dst aligned to 16 bytes */ |
| for (i = cvt->len_cvt / sizeof (float); i && (((size_t) dst) & 15); --i, ++src, ++dst) { |
| *dst = (Sint16) (*src * 32767.0f); |
| } |
| |
| SDL_assert(!i || ((((size_t) dst) & 15) == 0)); |
| |
| /* Make sure src is aligned too. */ |
| if ((((size_t) src) & 15) == 0) { |
| /* Aligned! Do SSE blocks as long as we have 16 bytes available. */ |
| const __m128 mulby32767 = _mm_set1_ps(32767.0f); |
| __m128i *mmdst = (__m128i *) dst; |
| while (i >= 8) { /* 8 * float32 */ |
| const __m128i ints1 = _mm_cvtps_epi32(_mm_mul_ps(_mm_load_ps(src), mulby32767)); /* load 4 floats, convert to sint32 */ |
| const __m128i ints2 = _mm_cvtps_epi32(_mm_mul_ps(_mm_load_ps(src+4), mulby32767)); /* load 4 floats, convert to sint32 */ |
| _mm_store_si128(mmdst, _mm_packs_epi32(ints1, ints2)); /* pack to sint16, store out. */ |
| i -= 8; src += 8; mmdst++; |
| } |
| dst = (Sint16 *) mmdst; |
| } |
| |
| /* Finish off any leftovers with scalar operations. */ |
| while (i) { |
| *dst = (Sint16) (*src * 32767.0f); |
| i--; src++; dst++; |
| } |
| |
| cvt->len_cvt /= 2; |
| if (cvt->filters[++cvt->filter_index]) { |
| cvt->filters[cvt->filter_index](cvt, AUDIO_S16SYS); |
| } |
| } |
| |
| static void SDLCALL |
| SDL_Convert_F32_to_U16_SSE2(SDL_AudioCVT *cvt, SDL_AudioFormat format) |
| { |
| const float *src = (const float *) cvt->buf; |
| Uint16 *dst = (Uint16 *) cvt->buf; |
| int i; |
| |
| LOG_DEBUG_CONVERT("AUDIO_F32", "AUDIO_U16 (using SSE2)"); |
| |
| /* Get dst aligned to 16 bytes */ |
| for (i = cvt->len_cvt / sizeof (float); i && (((size_t) dst) & 15); --i, ++src, ++dst) { |
| *dst = (Uint16) ((*src + 1.0f) * 32767.0f); |
| } |
| |
| SDL_assert(!i || ((((size_t) dst) & 15) == 0)); |
| |
| /* Make sure src is aligned too. */ |
| if ((((size_t) src) & 15) == 0) { |
| /* Aligned! Do SSE blocks as long as we have 16 bytes available. */ |
| /* This calculates differently than the scalar path because SSE2 can't |
| pack int32 data down to unsigned int16. _mm_packs_epi32 does signed |
| saturation, so that would corrupt our data. _mm_packus_epi32 exists, |
| but not before SSE 4.1. So we convert from float to sint16, packing |
| that down with legit signed saturation, and then xor the top bit |
| against 1. This results in the correct unsigned 16-bit value, even |
| though it looks like dark magic. */ |
| const __m128 mulby32767 = _mm_set1_ps(32767.0f); |
| const __m128i topbit = _mm_set1_epi16(-32768); |
| __m128i *mmdst = (__m128i *) dst; |
| while (i >= 8) { /* 8 * float32 */ |
| const __m128i ints1 = _mm_cvtps_epi32(_mm_mul_ps(_mm_load_ps(src), mulby32767)); /* load 4 floats, convert to sint32 */ |
| const __m128i ints2 = _mm_cvtps_epi32(_mm_mul_ps(_mm_load_ps(src+4), mulby32767)); /* load 4 floats, convert to sint32 */ |
| _mm_store_si128(mmdst, _mm_xor_si128(_mm_packs_epi32(ints1, ints2), topbit)); /* pack to sint16, xor top bit, store out. */ |
| i -= 8; src += 8; mmdst++; |
| } |
| dst = (Uint16 *) mmdst; |
| } |
| |
| /* Finish off any leftovers with scalar operations. */ |
| while (i) { |
| *dst = (Uint16) ((*src + 1.0f) * 32767.0f); |
| i--; src++; dst++; |
| } |
| |
| cvt->len_cvt /= 2; |
| if (cvt->filters[++cvt->filter_index]) { |
| cvt->filters[cvt->filter_index](cvt, AUDIO_U16SYS); |
| } |
| } |
| |
| static void SDLCALL |
| SDL_Convert_F32_to_S32_SSE2(SDL_AudioCVT *cvt, SDL_AudioFormat format) |
| { |
| const float *src = (const float *) cvt->buf; |
| Sint32 *dst = (Sint32 *) cvt->buf; |
| int i; |
| |
| LOG_DEBUG_CONVERT("AUDIO_F32", "AUDIO_S32 (using SSE2)"); |
| |
| /* Get dst aligned to 16 bytes */ |
| for (i = cvt->len_cvt / sizeof (float); i && (((size_t) dst) & 15); --i, ++src, ++dst) { |
| *dst = (Sint32) (((double) *src) * 2147483647.0); |
| } |
| |
| SDL_assert(!i || ((((size_t) dst) & 15) == 0)); |
| SDL_assert(!i || ((((size_t) src) & 15) == 0)); |
| |
| { |
| /* Aligned! Do SSE blocks as long as we have 16 bytes available. */ |
| const __m128d mulby2147483647 = _mm_set1_pd(2147483647.0); |
| __m128i *mmdst = (__m128i *) dst; |
| while (i >= 4) { /* 4 * float32 */ |
| const __m128 floats = _mm_load_ps(src); |
| /* bitshift the whole register over, so _mm_cvtps_pd can read the top floats in the bottom of the vector. */ |
| const __m128d doubles1 = _mm_mul_pd(_mm_cvtps_pd(_mm_castsi128_ps(_mm_srli_si128(_mm_castps_si128(floats), 8))), mulby2147483647); |
| const __m128d doubles2 = _mm_mul_pd(_mm_cvtps_pd(floats), mulby2147483647); |
| _mm_store_si128(mmdst, _mm_or_si128(_mm_slli_si128(_mm_cvtpd_epi32(doubles1), 8), _mm_cvtpd_epi32(doubles2))); |
| i -= 4; src += 4; mmdst++; |
| } |
| dst = (Sint32 *) mmdst; |
| } |
| |
| /* Finish off any leftovers with scalar operations. */ |
| while (i) { |
| *dst = (Sint32) (((double) *src) * 2147483647.0); |
| i--; src++; dst++; |
| } |
| |
| if (cvt->filters[++cvt->filter_index]) { |
| cvt->filters[cvt->filter_index](cvt, AUDIO_S32SYS); |
| } |
| } |
| #endif |
| |
| |
| void SDL_ChooseAudioConverters(void) |
| { |
| static SDL_bool converters_chosen = SDL_FALSE; |
| |
| if (converters_chosen) { |
| return; |
| } |
| |
| #define SET_CONVERTER_FUNCS(fntype) \ |
| SDL_Convert_S8_to_F32 = SDL_Convert_S8_to_F32_##fntype; \ |
| SDL_Convert_U8_to_F32 = SDL_Convert_U8_to_F32_##fntype; \ |
| SDL_Convert_S16_to_F32 = SDL_Convert_S16_to_F32_##fntype; \ |
| SDL_Convert_U16_to_F32 = SDL_Convert_U16_to_F32_##fntype; \ |
| SDL_Convert_S32_to_F32 = SDL_Convert_S32_to_F32_##fntype; \ |
| SDL_Convert_F32_to_S8 = SDL_Convert_F32_to_S8_##fntype; \ |
| SDL_Convert_F32_to_U8 = SDL_Convert_F32_to_U8_##fntype; \ |
| SDL_Convert_F32_to_S16 = SDL_Convert_F32_to_S16_##fntype; \ |
| SDL_Convert_F32_to_U16 = SDL_Convert_F32_to_U16_##fntype; \ |
| SDL_Convert_F32_to_S32 = SDL_Convert_F32_to_S32_##fntype; \ |
| converters_chosen = SDL_TRUE |
| |
| #if HAVE_SSE2_INTRINSICS |
| if (SDL_HasSSE2()) { |
| SET_CONVERTER_FUNCS(SSE2); |
| return; |
| } |
| #endif |
| |
| #if NEED_SCALAR_CONVERTER_FALLBACKS |
| SET_CONVERTER_FUNCS(Scalar); |
| #endif |
| |
| #undef SET_CONVERTER_FUNCS |
| |
| SDL_assert(converters_chosen == SDL_TRUE); |
| } |
| |
| /* vi: set ts=4 sw=4 expandtab: */ |