Fixed broken audio conversions between float and unsigned datatypes.
--HG-- extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%402058
This commit is contained in:
Ryan C. Gordon
parent
4a039aaede
commit
f3acf2d311
2 changed files with 32 additions and 38 deletions
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@ -28,9 +28,7 @@
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/* *INDENT-OFF* */
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#define DIVBY127 0.0078740157480315f
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#define DIVBY255 0.00392156862745098f
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#define DIVBY32767 3.05185094759972e-05f
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#define DIVBY65535 1.52590218966964e-05f
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#define DIVBY2147483647 4.6566128752458e-10f
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static void SDLCALL
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@ -221,7 +219,7 @@ SDL_Convert_U8_to_F32LSB(SDL_AudioCVT * cvt, SDL_AudioFormat format)
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src = (const Uint8 *) (cvt->buf + cvt->len_cvt);
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dst = (float *) (cvt->buf + cvt->len_cvt * 4);
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for (i = cvt->len_cvt / sizeof (Uint8); i; --i, --src, --dst) {
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const float val = (((float) *src) * DIVBY255);
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const float val = ((((float) *src) * DIVBY127) - 1.0f);
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*dst = SDL_SwapFloatLE(val);
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}
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@ -246,7 +244,7 @@ SDL_Convert_U8_to_F32MSB(SDL_AudioCVT * cvt, SDL_AudioFormat format)
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src = (const Uint8 *) (cvt->buf + cvt->len_cvt);
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dst = (float *) (cvt->buf + cvt->len_cvt * 4);
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for (i = cvt->len_cvt / sizeof (Uint8); i; --i, --src, --dst) {
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const float val = (((float) *src) * DIVBY255);
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const float val = ((((float) *src) * DIVBY127) - 1.0f);
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*dst = SDL_SwapFloatBE(val);
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}
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@ -667,7 +665,7 @@ SDL_Convert_U16LSB_to_F32LSB(SDL_AudioCVT * cvt, SDL_AudioFormat format)
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src = (const Uint16 *) (cvt->buf + cvt->len_cvt);
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dst = (float *) (cvt->buf + cvt->len_cvt * 2);
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for (i = cvt->len_cvt / sizeof (Uint16); i; --i, --src, --dst) {
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const float val = (((float) SDL_SwapLE16(*src)) * DIVBY65535);
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const float val = ((((float) SDL_SwapLE16(*src)) * DIVBY32767) - 1.0f);
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*dst = SDL_SwapFloatLE(val);
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}
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@ -692,7 +690,7 @@ SDL_Convert_U16LSB_to_F32MSB(SDL_AudioCVT * cvt, SDL_AudioFormat format)
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src = (const Uint16 *) (cvt->buf + cvt->len_cvt);
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dst = (float *) (cvt->buf + cvt->len_cvt * 2);
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for (i = cvt->len_cvt / sizeof (Uint16); i; --i, --src, --dst) {
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const float val = (((float) SDL_SwapLE16(*src)) * DIVBY65535);
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const float val = ((((float) SDL_SwapLE16(*src)) * DIVBY32767) - 1.0f);
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*dst = SDL_SwapFloatBE(val);
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}
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@ -1111,7 +1109,7 @@ SDL_Convert_U16MSB_to_F32LSB(SDL_AudioCVT * cvt, SDL_AudioFormat format)
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src = (const Uint16 *) (cvt->buf + cvt->len_cvt);
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dst = (float *) (cvt->buf + cvt->len_cvt * 2);
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for (i = cvt->len_cvt / sizeof (Uint16); i; --i, --src, --dst) {
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const float val = (((float) SDL_SwapBE16(*src)) * DIVBY65535);
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const float val = ((((float) SDL_SwapBE16(*src)) * DIVBY32767) - 1.0f);
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*dst = SDL_SwapFloatLE(val);
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}
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@ -1136,7 +1134,7 @@ SDL_Convert_U16MSB_to_F32MSB(SDL_AudioCVT * cvt, SDL_AudioFormat format)
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src = (const Uint16 *) (cvt->buf + cvt->len_cvt);
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dst = (float *) (cvt->buf + cvt->len_cvt * 2);
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for (i = cvt->len_cvt / sizeof (Uint16); i; --i, --src, --dst) {
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const float val = (((float) SDL_SwapBE16(*src)) * DIVBY65535);
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const float val = ((((float) SDL_SwapBE16(*src)) * DIVBY32767) - 1.0f);
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*dst = SDL_SwapFloatBE(val);
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}
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@ -1827,7 +1825,7 @@ SDL_Convert_F32LSB_to_U8(SDL_AudioCVT * cvt, SDL_AudioFormat format)
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src = (const float *) cvt->buf;
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dst = (Uint8 *) cvt->buf;
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for (i = cvt->len_cvt / sizeof (float); i; --i, ++src, ++dst) {
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const Uint8 val = ((Uint8) (SDL_SwapFloatLE(*src) * 255.0f));
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const Uint8 val = ((Uint8) ((SDL_SwapFloatLE(*src) + 1.0f) * 127.0f));
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*dst = val;
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}
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@ -1877,7 +1875,7 @@ SDL_Convert_F32LSB_to_U16LSB(SDL_AudioCVT * cvt, SDL_AudioFormat format)
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src = (const float *) cvt->buf;
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dst = (Uint16 *) cvt->buf;
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for (i = cvt->len_cvt / sizeof (float); i; --i, ++src, ++dst) {
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const Uint16 val = ((Uint16) (SDL_SwapFloatLE(*src) * 65535.0f));
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const Uint16 val = ((Uint16) ((SDL_SwapFloatLE(*src) + 1.0f) * 32767.0f));
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*dst = SDL_SwapLE16(val);
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}
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@ -1927,7 +1925,7 @@ SDL_Convert_F32LSB_to_U16MSB(SDL_AudioCVT * cvt, SDL_AudioFormat format)
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src = (const float *) cvt->buf;
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dst = (Uint16 *) cvt->buf;
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for (i = cvt->len_cvt / sizeof (float); i; --i, ++src, ++dst) {
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const Uint16 val = ((Uint16) (SDL_SwapFloatLE(*src) * 65535.0f));
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const Uint16 val = ((Uint16) ((SDL_SwapFloatLE(*src) + 1.0f) * 32767.0f));
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*dst = SDL_SwapBE16(val);
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}
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@ -2049,7 +2047,7 @@ SDL_Convert_F32MSB_to_U8(SDL_AudioCVT * cvt, SDL_AudioFormat format)
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src = (const float *) cvt->buf;
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dst = (Uint8 *) cvt->buf;
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for (i = cvt->len_cvt / sizeof (float); i; --i, ++src, ++dst) {
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const Uint8 val = ((Uint8) (SDL_SwapFloatBE(*src) * 255.0f));
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const Uint8 val = ((Uint8) ((SDL_SwapFloatBE(*src) + 1.0f) * 127.0f));
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*dst = val;
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}
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@ -2099,7 +2097,7 @@ SDL_Convert_F32MSB_to_U16LSB(SDL_AudioCVT * cvt, SDL_AudioFormat format)
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src = (const float *) cvt->buf;
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dst = (Uint16 *) cvt->buf;
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for (i = cvt->len_cvt / sizeof (float); i; --i, ++src, ++dst) {
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const Uint16 val = ((Uint16) (SDL_SwapFloatBE(*src) * 65535.0f));
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const Uint16 val = ((Uint16) ((SDL_SwapFloatBE(*src) + 1.0f) * 32767.0f));
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*dst = SDL_SwapLE16(val);
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}
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@ -2149,7 +2147,7 @@ SDL_Convert_F32MSB_to_U16MSB(SDL_AudioCVT * cvt, SDL_AudioFormat format)
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src = (const float *) cvt->buf;
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dst = (Uint16 *) cvt->buf;
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for (i = cvt->len_cvt / sizeof (float); i; --i, ++src, ++dst) {
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const Uint16 val = ((Uint16) (SDL_SwapFloatBE(*src) * 65535.0f));
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const Uint16 val = ((Uint16) ((SDL_SwapFloatBE(*src) + 1.0f) * 32767.0f));
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*dst = SDL_SwapBE16(val);
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}
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@ -54,7 +54,7 @@ sub outputHeader {
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EOF
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my @vals = ( 127, 255, 32767, 65535, 2147483647 );
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my @vals = ( 127, 32767, 2147483647 );
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foreach (@vals) {
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my $val = $_;
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my $fval = 1.0 / $val;
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@ -113,38 +113,28 @@ sub getSwapFunc {
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sub maxIntVal {
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my ($signed, $size) = @_;
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if ($signed) {
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if ($size == 8) {
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return 0x7F;
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} elsif ($size == 16) {
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return 0x7FFF;
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} elsif ($size == 32) {
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return 0x7FFFFFFF;
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}
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} else {
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if ($size == 8) {
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return 0xFF;
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} elsif ($size == 16) {
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return 0xFFFF;
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} elsif ($size == 32) {
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return 0xFFFFFFFF;
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}
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my $size = shift;
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if ($size == 8) {
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return 0x7F;
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} elsif ($size == 16) {
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return 0x7FFF;
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} elsif ($size == 32) {
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return 0x7FFFFFFF;
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}
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die("bug in script.\n");
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}
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sub getFloatToIntMult {
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my ($signed, $size) = @_;
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my $val = maxIntVal($signed, $size) . '.0';
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my $size = shift;
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my $val = maxIntVal($size) . '.0';
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$val .= 'f' if ($size < 32);
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return $val;
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}
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sub getIntToFloatDivBy {
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my ($signed, $size) = @_;
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return 'DIVBY' . maxIntVal($signed, $size);
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my $size = shift;
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return 'DIVBY' . maxIntVal($size);
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}
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sub getSignFlipVal {
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@ -215,13 +205,19 @@ EOF
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my $code = getSwapFunc($fsize, $fsigned, $ffloat, $fendian, '*src');
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if ($ffloat != $tfloat) {
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if ($ffloat) {
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my $mult = getFloatToIntMult($tsigned, $tsize);
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my $mult = getFloatToIntMult($tsize);
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if (!$tsigned) { # bump from -1.0f/1.0f to 0.0f/2.0f
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$code = "($code + 1.0f)";
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}
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$code = "(($tctype) ($code * $mult))";
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} else {
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# $divby will be the reciprocal, to avoid pipeline stalls
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# from floating point division...so multiply it.
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my $divby = getIntToFloatDivBy($fsigned, $fsize);
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my $divby = getIntToFloatDivBy($fsize);
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$code = "(((float) $code) * $divby)";
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if (!$fsigned) { # bump from 0.0f/2.0f to -1.0f/1.0f.
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$code = "($code - 1.0f)";
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}
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}
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} else {
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# All integer conversions here.
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