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audiocommon: remove 1:1 interpolation

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The usual one is 32->48 khz interpolation. So there is no need in a special 1:1 interpolation only for performance.
This commit is contained in:
degasus 2014-02-06 06:38:04 +01:00
parent 4a5ef06f71
commit 2956ffa5be
1 changed files with 20 additions and 48 deletions
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68
Source/Core/AudioCommon/Mixer.cpp
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@ -56,59 +56,31 @@ unsigned int CMixer::Mix(short* samples, unsigned int numSamples)
if (m_AIplaying) {
numLeft = (numLeft > numSamples) ? numSamples : numLeft;
if (AudioInterface::GetAIDSampleRate() == m_sampleRate) // (1:1)
{
#if _M_SSE >= 0x301
if (cpu_info.bSSSE3 && !((numLeft * 2) % 8))
{
static const __m128i sr_mask =
_mm_set_epi32(0x0C0D0E0FL, 0x08090A0BL,
0x04050607L, 0x00010203L);
//render numleft sample pairs to samples[]
//advance indexR with sample position
//remember fractional offset
for (unsigned int i = 0; i < numLeft * 2; i += 8)
{
_mm_storeu_si128((__m128i *)&samples[i], _mm_shuffle_epi8(_mm_loadu_si128((__m128i *)&m_buffer[(indexR + i) & INDEX_MASK]), sr_mask));
}
}
else
#endif
{
for (unsigned int i = 0; i < numLeft * 2; i+=2)
{
samples[i] = Common::swap16(m_buffer[(indexR + i + 1) & INDEX_MASK]);
samples[i+1] = Common::swap16(m_buffer[(indexR + i) & INDEX_MASK]);
}
}
indexR += numLeft * 2;
}
else //linear interpolation
{
//render numleft sample pairs to samples[]
//advance indexR with sample position
//remember fractional offset
static u32 frac = 0;
const u32 ratio = (u32)( 65536.0f * (float)AudioInterface::GetAIDSampleRate() / (float)m_sampleRate );
static u32 frac = 0;
const u32 ratio = (u32)( 65536.0f * (float)AudioInterface::GetAIDSampleRate() / (float)m_sampleRate );
for (u32 i = 0; i < numLeft * 2; i+=2) {
u32 indexR2 = indexR + 2; //next sample
if ((indexR2 & INDEX_MASK) == (indexW & INDEX_MASK)) //..if it exists
indexR2 = indexR;
for (u32 i = 0; i < numLeft * 2; i+=2) {
u32 indexR2 = indexR + 2; //next sample
if ((indexR2 & INDEX_MASK) == (indexW & INDEX_MASK)) //..if it exists
indexR2 = indexR;
s16 l1 = Common::swap16(m_buffer[indexR & INDEX_MASK]); //current
s16 l2 = Common::swap16(m_buffer[indexR2 & INDEX_MASK]); //next
int sampleL = ((l1 << 16) + (l2 - l1) * (u16)frac) >> 16;
samples[i+1] = sampleL;
s16 l1 = Common::swap16(m_buffer[indexR & INDEX_MASK]); //current
s16 l2 = Common::swap16(m_buffer[indexR2 & INDEX_MASK]); //next
int sampleL = ((l1 << 16) + (l2 - l1) * (u16)frac) >> 16;
samples[i+1] = sampleL;
s16 r1 = Common::swap16(m_buffer[(indexR + 1) & INDEX_MASK]); //current
s16 r2 = Common::swap16(m_buffer[(indexR2 + 1) & INDEX_MASK]); //next
int sampleR = ((r1 << 16) + (r2 - r1) * (u16)frac) >> 16;
samples[i] = sampleR;
s16 r1 = Common::swap16(m_buffer[(indexR + 1) & INDEX_MASK]); //current
s16 r2 = Common::swap16(m_buffer[(indexR2 + 1) & INDEX_MASK]); //next
int sampleR = ((r1 << 16) + (r2 - r1) * (u16)frac) >> 16;
samples[i] = sampleR;
frac += ratio;
indexR += 2 * (u16)(frac >> 16);
frac &= 0xffff;
}
frac += ratio;
indexR += 2 * (u16)(frac >> 16);
frac &= 0xffff;
}
} else {