remove alternative sample decoders

2 files changed, 0 insertions, 270 deletions

diff --git a/source/snes9x.h b/source/snes9x.h
index c230f17..9ddce7b 100644
--- a/source/snes9x.h
+++ b/source/snes9x.h
@@ -334,7 +334,6 @@ typedef struct
    bool8  ThreadSound;
    bool8  Mute;
    bool8  NextAPUEnabled;
-   uint8  AltSampleDecode;
    bool8  FixFrequency;
 
    /* Graphics options */
diff --git a/source/soundux.c b/source/soundux.c
index 1ddbd48..d991c04 100644
--- a/source/soundux.c
+++ b/source/soundux.c
@@ -494,267 +494,6 @@ void S9xSetSoundType(int channel, int type_of_sound)
    SoundData.channels[channel].type = type_of_sound;
 }
 
-void AltDecodeBlock(Channel* ch)
-{
-   if (ch->block_pointer >= 0x10000 - 9)
-   {
-      ch->last_block = TRUE;
-      ch->loop = FALSE;
-      ch->block = ch->decoded;
-      memset((void*) ch->decoded, 0, sizeof(int16) * 16);
-      return;
-   }
-   signed char* compressed = (signed char*) &IAPU.RAM [ch->block_pointer];
-
-   unsigned char filter = *compressed;
-   if ((ch->last_block = filter & 1))
-      ch->loop = (filter & 2) != 0;
-
-#if !defined(ANDROID) && (defined (USE_X86_ASM) && (defined (__i386__) || defined (__i486__) ||\
-               defined (__i586__) || defined (__WIN32__) || defined (__DJGPP)))
-   int16* raw = ch->block = ch->decoded;
-
-   if (Settings.AltSampleDecode == 1)
-      DecodeBlockAsm(compressed, raw, &ch->previous [0], &ch->previous [1]);
-   else
-      DecodeBlockAsm2(compressed, raw, &ch->previous [0], &ch->previous [1]);
-#else
-   int32 out;
-   unsigned char shift;
-   signed char sample1, sample2;
-   unsigned int i;
-
-   compressed++;
-   signed short* raw = ch->block = ch->decoded;
-
-   int32 prev0 = ch->previous [0];
-   int32 prev1 = ch->previous [1];
-   shift = filter >> 4;
-
-   switch ((filter >> 2) & 3)
-   {
-   case 0:
-      for (i = 8; i != 0; i--)
-      {
-         sample1 = *compressed++;
-         sample2 = sample1 << 4;
-         sample2 >>= 4;
-         sample1 >>= 4;
-         *raw++ = ((int32) sample1 << shift);
-         *raw++ = ((int32) sample2 << shift);
-      }
-      prev1 = *(raw - 2);
-      prev0 = *(raw - 1);
-      break;
-   case 1:
-      for (i = 8; i != 0; i--)
-      {
-         sample1 = *compressed++;
-         sample2 = sample1 << 4;
-         sample2 >>= 4;
-         sample1 >>= 4;
-         prev0 = (int16) prev0;
-         *raw++ = prev1 = ((int32) sample1 << shift) + prev0 - (prev0 >> 4);
-         prev1 = (int16) prev1;
-         *raw++ = prev0 = ((int32) sample2 << shift) + prev1 - (prev1 >> 4);
-      }
-      break;
-   case 2:
-      for (i = 8; i != 0; i--)
-      {
-         sample1 = *compressed++;
-         sample2 = sample1 << 4;
-         sample2 >>= 4;
-         sample1 >>= 4;
-
-         out = (sample1 << shift) - prev1 + (prev1 >> 4);
-         prev1 = (int16) prev0;
-         prev0 &= ~3;
-         *raw++ = prev0 = out + (prev0 << 1) - (prev0 >> 5) -
-                          (prev0 >> 4);
-
-         out = (sample2 << shift) - prev1 + (prev1 >> 4);
-         prev1 = (int16) prev0;
-         prev0 &= ~3;
-         *raw++ = prev0 = out + (prev0 << 1) - (prev0 >> 5) -
-                          (prev0 >> 4);
-      }
-      break;
-   case 3:
-      for (i = 8; i != 0; i--)
-      {
-         sample1 = *compressed++;
-         sample2 = sample1 << 4;
-         sample2 >>= 4;
-         sample1 >>= 4;
-         out = (sample1 << shift);
-
-         out = out - prev1 + (prev1 >> 3) + (prev1 >> 4);
-         prev1 = (int16) prev0;
-         prev0 &= ~3;
-         *raw++ = prev0 = out + (prev0 << 1) - (prev0 >> 3) -
-                          (prev0 >> 4) - (prev1 >> 6);
-
-         out = (sample2 << shift);
-         out = out - prev1 + (prev1 >> 3) + (prev1 >> 4);
-         prev1 = (int16) prev0;
-         prev0 &= ~3;
-         *raw++ = prev0 = out + (prev0 << 1) - (prev0 >> 3) -
-                          (prev0 >> 4) - (prev1 >> 6);
-      }
-      break;
-   }
-   ch->previous [0] = prev0;
-   ch->previous [1] = prev1;
-#endif
-
-   ch->block_pointer += 9;
-}
-
-void AltDecodeBlock2(Channel* ch)
-{
-   int32 out;
-   unsigned char filter;
-   unsigned char shift;
-   signed char sample1, sample2;
-   unsigned char i;
-
-   if (ch->block_pointer > 0x10000 - 9)
-   {
-      ch->last_block = TRUE;
-      ch->loop = FALSE;
-      ch->block = ch->decoded;
-      memset((void*) ch->decoded, 0, sizeof(int16) * 16);
-      return;
-   }
-
-   signed char* compressed = (signed char*) &IAPU.RAM [ch->block_pointer];
-
-   filter = *compressed;
-   if ((ch->last_block = filter & 1))
-      ch->loop = (filter & 2) != 0;
-
-   compressed++;
-   signed short* raw = ch->block = ch->decoded;
-
-   shift = filter >> 4;
-   int32 prev0 = ch->previous [0];
-   int32 prev1 = ch->previous [1];
-
-   if (shift > 12)
-      shift -= 4;
-
-   switch ((filter >> 2) & 3)
-   {
-   case 0:
-      for (i = 8; i != 0; i--)
-      {
-         sample1 = *compressed++;
-         sample2 = sample1 << 4;
-         //Sample 2 = Bottom Nibble, Sign Extended.
-         sample2 >>= 4;
-         //Sample 1 = Top Nibble, shifted down and Sign Extended.
-         sample1 >>= 4;
-
-         out = (int32)(sample1 << shift);
-
-         prev1 = prev0;
-         prev0 = out;
-         CLIP16(out);
-         *raw++ = (int16)out;
-
-         out = (int32)(sample2 << shift);
-
-         prev1 = prev0;
-         prev0 = out;
-         CLIP16(out);
-         *raw++ = (int16)out;
-      }
-      break;
-   case 1:
-      for (i = 8; i != 0; i--)
-      {
-         sample1 = *compressed++;
-         sample2 = sample1 << 4;
-         //Sample 2 = Bottom Nibble, Sign Extended.
-         sample2 >>= 4;
-         //Sample 1 = Top Nibble, shifted down and Sign Extended.
-         sample1 >>= 4;
-         out = (int32)(sample1 << shift);
-         out += (int32)((double)prev0 * 15 / 16);
-
-         prev1 = prev0;
-         prev0 = out;
-         CLIP16(out);
-         *raw++ = (int16)out;
-
-         out = (int32)(sample2 << shift);
-         out += (int32)((double)prev0 * 15 / 16);
-
-         prev1 = prev0;
-         prev0 = out;
-         CLIP16(out);
-         *raw++ = (int16)out;
-      }
-      break;
-   case 2:
-      for (i = 8; i != 0; i--)
-      {
-         sample1 = *compressed++;
-         sample2 = sample1 << 4;
-         //Sample 2 = Bottom Nibble, Sign Extended.
-         sample2 >>= 4;
-         //Sample 1 = Top Nibble, shifted down and Sign Extended.
-         sample1 >>= 4;
-
-         out = ((sample1 << shift) * 256 + (prev0 & ~0x2) * 488 - prev1 * 240) >> 8;
-
-         prev1 = prev0;
-         prev0 = (int16)out;
-         *raw++ = (int16)out;
-
-         out = ((sample2 << shift) * 256 + (prev0 & ~0x2) * 488 - prev1 * 240) >> 8;
-
-         prev1 = prev0;
-         prev0 = (int16)out;
-         *raw++ = (int16)out;
-      }
-      break;
-
-   case 3:
-      for (i = 8; i != 0; i--)
-      {
-         sample1 = *compressed++;
-         sample2 = sample1 << 4;
-         //Sample 2 = Bottom Nibble, Sign Extended.
-         sample2 >>= 4;
-         //Sample 1 = Top Nibble, shifted down and Sign Extended.
-         sample1 >>= 4;
-         out = (int32)(sample1 << shift);
-         out += (int32)((double)prev0 * 115 / 64 - (double)prev1 * 13 / 16);
-
-         prev1 = prev0;
-         prev0 = out;
-
-         CLIP16(out);
-         *raw++ = (int16)out;
-
-         out = (int32)(sample2 << shift);
-         out += (int32)((double)prev0 * 115 / 64 - (double)prev1 * 13 / 16);
-
-         prev1 = prev0;
-         prev0 = out;
-
-         CLIP16(out);
-         *raw++ = (int16)out;
-      }
-      break;
-   }
-   ch->previous [0] = prev0;
-   ch->previous [1] = prev1;
-   ch->block_pointer += 9;
-}
-
 void DecodeBlock(Channel* ch)
 {
    int32 out;
@@ -764,14 +503,6 @@ void DecodeBlock(Channel* ch)
    unsigned char i;
    bool invalid_header;
 
-   if (Settings.AltSampleDecode)
-   {
-      if (Settings.AltSampleDecode < 3)
-         AltDecodeBlock(ch);
-      else
-         AltDecodeBlock2(ch);
-      return;
-   }
    if (ch->block_pointer > 0x10000 - 9)
    {
       ch->last_block = TRUE;