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sconv: Change/fix conversion to/from float32
use (1<<15) instead of 0x7fff as a factor when converting from s16 to float32 use (1<<31) instead of 0x7fffffff as a factor when converting from s32 to float32 the change is motivated by the following desireable properties: * s16_from_f32(f32_from_s16(x)) == x for all possible s16 values * x / (1.0f << 15) == x * (1.0f / (1 << 15)) for all x in s16 above changes enable easier optimization while guaranteeing bit-exact results further, other audio sample conversion code (libavresample) does it the same way v3 (comments Tanu): * fix saturation in pa_sconv_s16le_from_f32ne_neon(), use vqrshrn v2 (comments Tanu): * fix comments in ARM NEON code * use llrintf() in pa_sconv_s32le_from_float32ne() Signed-off-by: Peter Meerwald <p.meerwald@bct-electronic.com> Cc: Tanu Kaskinen <tanuk@iki.fi>
This commit is contained in:
Peter Meerwald
Tanu Kaskinen
parent
596d9aa740
commit
e66e846418
3 changed files with 79 additions and 96 deletions
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@ -85,11 +85,11 @@ void pa_sconv_s16le_to_float32ne(unsigned n, const int16_t *a, float *b) {
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#if SWAP_WORDS == 1
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for (; n > 0; n--) {
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int16_t s = *(a++);
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*(b++) = ((float) INT16_FROM(s))/(float) 0x7FFF;
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*(b++) = INT16_FROM(s) * (1.0f / (1 << 15));
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}
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#else
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for (; n > 0; n--)
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*(b++) = ((float) (*(a++)))/(float) 0x7FFF;
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*(b++) = *(a++) * (1.0f / (1 << 15));
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#endif
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}
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@ -100,11 +100,11 @@ void pa_sconv_s32le_to_float32ne(unsigned n, const int32_t *a, float *b) {
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#if SWAP_WORDS == 1
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for (; n > 0; n--) {
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int32_t s = *(a++);
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*(b++) = (float) (((double) INT32_FROM(s))/0x7FFFFFFF);
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*(b++) = INT32_FROM(s) * (1.0f / (1U << 31));
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}
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#else
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for (; n > 0; n--)
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*(b++) = (float) (((double) (*(a++)))/0x7FFFFFFF);
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*(b++) = *(a++) * (1.0f / (1U << 31));
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#endif
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}
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@ -115,18 +115,16 @@ void pa_sconv_s16le_from_float32ne(unsigned n, const float *a, int16_t *b) {
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#if SWAP_WORDS == 1
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for (; n > 0; n--) {
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int16_t s;
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float v = *(a++);
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float v = *(a++) * (1 << 15);
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v = PA_CLAMP_UNLIKELY(v, -1.0f, 1.f);
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s = (int16_t) lrintf(v * 0x7FFF);
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s = (int16_t) PA_CLAMP_UNLIKELY(lrintf(v), -0x8000, 0x7FFF);
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*(b++) = INT16_TO(s);
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}
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#else
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for (; n > 0; n--) {
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float v = *(a++);
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float v = *(a++) * (1 << 15);
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v = PA_CLAMP_UNLIKELY(v, -1.0f, 1.f);
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*(b++) = (int16_t) lrintf(v * 0x7FFF);
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*(b++) = (int16_t) PA_CLAMP_UNLIKELY(lrintf(v), -0x8000, 0x7FFF);
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}
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#endif
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}
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@ -138,18 +136,16 @@ void pa_sconv_s32le_from_float32ne(unsigned n, const float *a, int32_t *b) {
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#if SWAP_WORDS == 1
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for (; n > 0; n--) {
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int32_t s;
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float v = *(a++);
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float v = *(a++) * (1U << 31);
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v = PA_CLAMP_UNLIKELY(v, -1.0f, 1.0f);
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s = (int32_t) lrint((double) v * (double) 0x7FFFFFFF);
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s = (int32_t) PA_CLAMP_UNLIKELY(llrintf(v), -0x80000000LL, 0x7FFFFFFFLL);
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*(b++) = INT32_TO(s);
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}
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#else
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for (; n > 0; n--) {
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float v = *(a++);
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float v = *(a++) * (1U << 31);
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v = PA_CLAMP_UNLIKELY(v, -1.0f, 1.0f);
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*(b++) = (int32_t) lrint((double) v * (double) 0x7FFFFFFF);
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*(b++) = (int32_t) PA_CLAMP_UNLIKELY(llrintf(v), -0x80000000LL, 0x7FFFFFFFLL);
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}
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#endif
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}
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@ -160,7 +156,7 @@ void pa_sconv_s16le_to_float32re(unsigned n, const int16_t *a, float *b) {
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for (; n > 0; n--) {
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int16_t s = *(a++);
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float k = ((float) INT16_FROM(s))/0x7FFF;
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float k = INT16_FROM(s) * (1.0f / (1 << 15));
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k = PA_FLOAT32_SWAP(k);
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*(b++) = k;
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}
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@ -172,7 +168,7 @@ void pa_sconv_s32le_to_float32re(unsigned n, const int32_t *a, float *b) {
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for (; n > 0; n--) {
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int32_t s = *(a++);
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float k = (float) (((double) INT32_FROM(s))/0x7FFFFFFF);
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float k = INT32_FROM(s) * (1.0f / (1U << 31));
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k = PA_FLOAT32_SWAP(k);
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*(b++) = k;
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}
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@ -185,9 +181,8 @@ void pa_sconv_s16le_from_float32re(unsigned n, const float *a, int16_t *b) {
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for (; n > 0; n--) {
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int16_t s;
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float v = *(a++);
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v = PA_FLOAT32_SWAP(v);
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v = PA_CLAMP_UNLIKELY(v, -1.0f, 1.0f);
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s = (int16_t) lrintf(v * 0x7FFF);
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v = PA_FLOAT32_SWAP(v) * (1 << 15);
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s = (int16_t) PA_CLAMP_UNLIKELY(lrintf(v), -0x8000, 0x7FFF);
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*(b++) = INT16_TO(s);
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}
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}
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@ -199,9 +194,8 @@ void pa_sconv_s32le_from_float32re(unsigned n, const float *a, int32_t *b) {
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for (; n > 0; n--) {
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int32_t s;
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float v = *(a++);
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v = PA_FLOAT32_SWAP(v);
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v = PA_CLAMP_UNLIKELY(v, -1.0f, 1.0f);
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s = (int32_t) lrint((double) v * 0x7FFFFFFF);
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v = PA_FLOAT32_SWAP(v) * (1U << 31);
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s = (int32_t) PA_CLAMP_UNLIKELY(llrintf(v), -0x80000000LL, 0x7FFFFFFFLL);
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*(b++) = INT32_TO(s);
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}
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}
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@ -304,7 +298,7 @@ void pa_sconv_s24le_to_float32ne(unsigned n, const uint8_t *a, float *b) {
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for (; n > 0; n--) {
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int32_t s = READ24(a) << 8;
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*b = ((float) s) / 0x7FFFFFFF;
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*b = s * (1.0f / (1U << 31));
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a += 3;
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b++;
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}
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@ -316,9 +310,8 @@ void pa_sconv_s24le_from_float32ne(unsigned n, const float *a, uint8_t *b) {
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for (; n > 0; n--) {
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int32_t s;
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float v = *a;
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v = PA_CLAMP_UNLIKELY(v, -1.0f, 1.0f);
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s = (int32_t) lrint((double) v * (double) 0x7FFFFFFF);
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float v = *a * (1U << 31);
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s = (int32_t) PA_CLAMP_UNLIKELY(llrint(v), -0x80000000LL, 0x7FFFFFFFLL);
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WRITE24(b, ((uint32_t) s) >> 8);
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a++;
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b += 3;
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@ -331,7 +324,7 @@ void pa_sconv_s24le_to_float32re(unsigned n, const uint8_t *a, float *b) {
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for (; n > 0; n--) {
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int32_t s = READ24(a) << 8;
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float k = ((float) s) / 0x7FFFFFFF;
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float k = s * (1.0f / (1U << 31));
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*b = PA_FLOAT32_SWAP(k);
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a += 3;
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b++;
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@ -345,9 +338,8 @@ void pa_sconv_s24le_from_float32re(unsigned n, const float *a, uint8_t *b) {
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for (; n > 0; n--) {
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int32_t s;
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float v = *a;
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v = PA_FLOAT32_SWAP(v);
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v = PA_CLAMP_UNLIKELY(v, -1.0f, 1.0f);
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s = (int32_t) lrint((double) v * (double) 0x7FFFFFFF);
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v = PA_FLOAT32_SWAP(v) * (1U << 31);
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s = (int32_t) PA_CLAMP_UNLIKELY(llrint(v), -0x80000000LL, 0x7FFFFFFFLL);
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WRITE24(b, ((uint32_t) s) >> 8);
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a++;
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b+=3;
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@ -406,7 +398,7 @@ void pa_sconv_s24_32le_to_float32ne(unsigned n, const uint32_t *a, float *b) {
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for (; n > 0; n--) {
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int32_t s = (int32_t) (UINT32_FROM(*a) << 8);
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*b = (float) s / (float) 0x7FFFFFFF;
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*b = s * (1.0f / (1U << 31));
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a++;
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b++;
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}
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@ -418,7 +410,7 @@ void pa_sconv_s24_32le_to_float32re(unsigned n, const uint32_t *a, float *b) {
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for (; n > 0; n--) {
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int32_t s = (int32_t) (UINT32_FROM(*a) << 8);
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float k = (float) s / (float) 0x7FFFFFFF;
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float k = s * (1.0f / (1U << 31));
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*b = PA_FLOAT32_SWAP(k);
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a++;
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b++;
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@ -431,9 +423,8 @@ void pa_sconv_s24_32le_from_float32ne(unsigned n, const float *a, uint32_t *b) {
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for (; n > 0; n--) {
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int32_t s;
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float v = *a;
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v = PA_CLAMP_UNLIKELY(v, -1.0f, 1.0f);
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s = (int32_t) lrint((double) v * (double) 0x7FFFFFFF);
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float v = *a * (1U << 31);
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s = (int32_t) PA_CLAMP_UNLIKELY(llrint(v), -0x80000000LL, 0x7FFFFFFFLL);
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*b = UINT32_TO(((uint32_t) s) >> 8);
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a++;
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b++;
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@ -447,9 +438,8 @@ void pa_sconv_s24_32le_from_float32re(unsigned n, const float *a, uint32_t *b) {
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for (; n > 0; n--) {
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int32_t s;
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float v = *a;
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v = PA_FLOAT32_SWAP(v);
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v = PA_CLAMP_UNLIKELY(v, -1.0f, 1.0f);
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s = (int32_t) lrint((double) v * (double) 0x7FFFFFFF);
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v = PA_FLOAT32_SWAP(v) * (1U << 31);
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s = (int32_t) PA_CLAMP_UNLIKELY(llrint(v), -0x80000000LL, 0x7FFFFFFFLL);
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*b = UINT32_TO(((uint32_t) s) >> 8);
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a++;
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b++;
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@ -36,18 +36,13 @@ static void pa_sconv_s16le_from_f32ne_neon(unsigned n, const float *src, int16_t
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"movs %[n], %[n], lsr #2 \n\t"
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"beq 2f \n\t"
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"vdup.f32 q2, %[plusone] \n\t"
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"vneg.f32 q3, q2 \n\t"
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"vdup.f32 q4, %[scale] \n\t"
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"vdup.u32 q5, %[mask] \n\t"
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"vdup.f32 q1, %[scale] \n\t"
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"1: \n\t"
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"vld1.32 {q0}, [%[src]]! \n\t"
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"vmin.f32 q0, q0, q2 \n\t" /* clamp */
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"vmax.f32 q0, q0, q3 \n\t"
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"vmul.f32 q0, q0, q4 \n\t" /* scale */
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"vcvt.s32.f32 q0, q0, #16 \n\t" /* narrow */
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"vrshrn.s32 d0, q0, #16 \n\t"
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"vmul.f32 q0, q0, q1 \n\t" /* scale */
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"vcvt.s32.f32 q0, q0, #16 \n\t" /* s32<-f32 as 16:16 fixed-point */
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"vqrshrn.s32 d0, q0, #16 \n\t" /* shift, round, narrow */
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"subs %[n], %[n], #1 \n\t"
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"vst1.16 {d0}, [%[dst]]! \n\t"
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"bgt 1b \n\t"
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@ -55,13 +50,13 @@ static void pa_sconv_s16le_from_f32ne_neon(unsigned n, const float *src, int16_t
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"2: \n\t"
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: [dst] "+r" (dst), [src] "+r" (src), [n] "+r" (n) /* output operands (or input operands that get modified) */
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: [plusone] "r" (1.0f), [scale] "r" (32767.0f), [mask] "r" (0x80000000) /* input operands */
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: "memory", "cc", "q0", "q1", "q2", "q3", "q4", "q5", "q6" /* clobber list */
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: [scale] "r" (32768.0f) /* input operands */
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: "memory", "cc", "q0", "q1" /* clobber list */
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);
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/* leftovers */
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while (i--) {
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*dst++ = (int16_t) lrintf(PA_CLAMP_UNLIKELY(*src, -1.0f, 1.0f) * 0x7FFF);
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*dst++ = (int16_t) PA_CLAMP_UNLIKELY(lrintf(*src * (1 << 15)), -0x8000, 0x7FFF);
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src++;
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}
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}
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@ -69,7 +64,7 @@ static void pa_sconv_s16le_from_f32ne_neon(unsigned n, const float *src, int16_t
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static void pa_sconv_s16le_to_f32ne_neon(unsigned n, const int16_t *src, float *dst) {
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unsigned i = n & 3;
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const float invscale = 1.0f / 0x7FFF;
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const float invscale = 1.0f / (1 << 15);
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__asm__ __volatile__ (
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"movs %[n], %[n], lsr #2 \n\t"
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@ -79,8 +74,8 @@ static void pa_sconv_s16le_to_f32ne_neon(unsigned n, const int16_t *src, float *
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"1: \n\t"
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"vld1.16 {d0}, [%[src]]! \n\t"
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"vmovl.s16 q0, d0 \n\t"
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"vcvt.f32.s32 q0, q0 \n\t"
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"vmovl.s16 q0, d0 \n\t" /* widen */
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"vcvt.f32.s32 q0, q0 \n\t" /* f32<-s32 */
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"vmul.f32 q0, q0, q1 \n\t"
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"subs %[n], %[n], #1 \n\t"
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"vst1.32 {q0}, [%[dst]]! \n\t"
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@ -35,17 +35,13 @@
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#if !defined(__APPLE__) && defined (__i386__) || defined (__amd64__)
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static const PA_DECLARE_ALIGNED (16, float, one[4]) = { 1.0, 1.0, 1.0, 1.0 };
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static const PA_DECLARE_ALIGNED (16, float, mone[4]) = { -1.0, -1.0, -1.0, -1.0 };
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static const PA_DECLARE_ALIGNED (16, float, scale[4]) = { 0x7fff, 0x7fff, 0x7fff, 0x7fff };
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static const PA_DECLARE_ALIGNED (16, float, scale[4]) = { 0x8000, 0x8000, 0x8000, 0x8000 };
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static void pa_sconv_s16le_from_f32ne_sse(unsigned n, const float *a, int16_t *b) {
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pa_reg_x86 temp, i;
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__asm__ __volatile__ (
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" movaps %5, %%xmm5 \n\t"
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" movaps %6, %%xmm6 \n\t"
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" movaps %7, %%xmm7 \n\t"
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" xor %0, %0 \n\t"
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" mov %4, %1 \n\t"
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@ -56,12 +52,8 @@ static void pa_sconv_s16le_from_f32ne_sse(unsigned n, const float *a, int16_t *b
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"1: \n\t"
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" movups (%q2, %0, 2), %%xmm0 \n\t" /* read 8 floats */
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" movups 16(%q2, %0, 2), %%xmm2 \n\t"
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" minps %%xmm5, %%xmm0 \n\t" /* clamp to 1.0 */
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" minps %%xmm5, %%xmm2 \n\t"
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" maxps %%xmm6, %%xmm0 \n\t" /* clamp to -1.0 */
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" maxps %%xmm6, %%xmm2 \n\t"
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" mulps %%xmm7, %%xmm0 \n\t" /* *= 0x7fff */
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" mulps %%xmm7, %%xmm2 \n\t"
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" mulps %%xmm5, %%xmm0 \n\t" /* *= 0x8000 */
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" mulps %%xmm5, %%xmm2 \n\t"
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" cvtps2pi %%xmm0, %%mm0 \n\t" /* low part to int */
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" cvtps2pi %%xmm2, %%mm2 \n\t"
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@ -82,24 +74,30 @@ static void pa_sconv_s16le_from_f32ne_sse(unsigned n, const float *a, int16_t *b
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"2: \n\t"
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" mov %4, %1 \n\t" /* prepare for leftovers */
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" and $7, %1 \n\t"
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" je 4f \n\t"
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" je 5f \n\t"
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"3: \n\t"
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" movss (%q2, %0, 2), %%xmm0 \n\t"
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" minss %%xmm5, %%xmm0 \n\t"
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" maxss %%xmm6, %%xmm0 \n\t"
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" mulss %%xmm7, %%xmm0 \n\t"
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" mulss %%xmm5, %%xmm0 \n\t"
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" cvtss2si %%xmm0, %4 \n\t"
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" movw %w4, (%q3, %0) \n\t"
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" add $0x8000, %4 \n\t" /* check for saturation */
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" and $~0xffff, %4 \n\t"
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" cvtss2si %%xmm0, %4 \n\t"
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" je 4f \n\t"
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" sar $31, %4 \n\t"
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" xor $0x7fff, %4 \n\t"
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"4: \n\t"
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" movw %w4, (%q3, %0) \n\t" /* store leftover */
|
||||
" add $2, %0 \n\t"
|
||||
" dec %1 \n\t"
|
||||
" jne 3b \n\t"
|
||||
|
||||
"4: \n\t"
|
||||
"5: \n\t"
|
||||
" emms \n\t"
|
||||
|
||||
: "=&r" (i), "=&r" (temp)
|
||||
: "r" (a), "r" (b), "r" ((pa_reg_x86)n), "m" (*one), "m" (*mone), "m" (*scale)
|
||||
: "r" (a), "r" (b), "r" ((pa_reg_x86)n), "m" (*scale)
|
||||
: "cc", "memory"
|
||||
);
|
||||
}
|
||||
|
|
@ -109,8 +107,6 @@ static void pa_sconv_s16le_from_f32ne_sse2(unsigned n, const float *a, int16_t *
|
|||
|
||||
__asm__ __volatile__ (
|
||||
" movaps %5, %%xmm5 \n\t"
|
||||
" movaps %6, %%xmm6 \n\t"
|
||||
" movaps %7, %%xmm7 \n\t"
|
||||
" xor %0, %0 \n\t"
|
||||
|
||||
" mov %4, %1 \n\t"
|
||||
|
|
@ -121,12 +117,8 @@ static void pa_sconv_s16le_from_f32ne_sse2(unsigned n, const float *a, int16_t *
|
|||
"1: \n\t"
|
||||
" movups (%q2, %0, 2), %%xmm0 \n\t" /* read 8 floats */
|
||||
" movups 16(%q2, %0, 2), %%xmm2 \n\t"
|
||||
" minps %%xmm5, %%xmm0 \n\t" /* clamp to 1.0 */
|
||||
" minps %%xmm5, %%xmm2 \n\t"
|
||||
" maxps %%xmm6, %%xmm0 \n\t" /* clamp to -1.0 */
|
||||
" maxps %%xmm6, %%xmm2 \n\t"
|
||||
" mulps %%xmm7, %%xmm0 \n\t" /* *= 0x7fff */
|
||||
" mulps %%xmm7, %%xmm2 \n\t"
|
||||
" mulps %%xmm5, %%xmm0 \n\t" /* *= 0x8000 */
|
||||
" mulps %%xmm5, %%xmm2 \n\t"
|
||||
|
||||
" cvtps2dq %%xmm0, %%xmm0 \n\t"
|
||||
" cvtps2dq %%xmm2, %%xmm2 \n\t"
|
||||
|
|
@ -141,23 +133,29 @@ static void pa_sconv_s16le_from_f32ne_sse2(unsigned n, const float *a, int16_t *
|
|||
"2: \n\t"
|
||||
" mov %4, %1 \n\t" /* prepare for leftovers */
|
||||
" and $7, %1 \n\t"
|
||||
" je 4f \n\t"
|
||||
" je 5f \n\t"
|
||||
|
||||
"3: \n\t"
|
||||
" movss (%q2, %0, 2), %%xmm0 \n\t"
|
||||
" minss %%xmm5, %%xmm0 \n\t"
|
||||
" maxss %%xmm6, %%xmm0 \n\t"
|
||||
" mulss %%xmm7, %%xmm0 \n\t"
|
||||
" mulss %%xmm5, %%xmm0 \n\t"
|
||||
" cvtss2si %%xmm0, %4 \n\t"
|
||||
" movw %w4, (%q3, %0) \n\t"
|
||||
" add $0x8000, %4 \n\t"
|
||||
" and $~0xffff, %4 \n\t" /* check for saturation */
|
||||
" cvtss2si %%xmm0, %4 \n\t"
|
||||
" je 4f \n\t"
|
||||
" sar $31, %4 \n\t"
|
||||
" xor $0x7fff, %4 \n\t"
|
||||
|
||||
"4: \n\t"
|
||||
" movw %w4, (%q3, %0) \n\t" /* store leftover */
|
||||
" add $2, %0 \n\t"
|
||||
" dec %1 \n\t"
|
||||
" jne 3b \n\t"
|
||||
|
||||
"4: \n\t"
|
||||
"5: \n\t"
|
||||
|
||||
: "=&r" (i), "=&r" (temp)
|
||||
: "r" (a), "r" (b), "r" ((pa_reg_x86)n), "m" (*one), "m" (*mone), "m" (*scale)
|
||||
: "r" (a), "r" (b), "r" ((pa_reg_x86)n), "m" (*scale)
|
||||
: "cc", "memory"
|
||||
);
|
||||
}
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue