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AudioCommon: Improve pad silence when ppc does not keep up with realtime

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Uses the last sample from the ppc buffer to fill the samples the ppc
didn't deliver data for, avoids clicking on underruns.


git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@7338 8ced0084-cf51-0410-be5f-012b33b47a6e
This commit is contained in:
pierre 2011-03-12 22:02:46 +00:00
parent 344c4019db
commit 37e31f2df6
2 changed files with 14 additions and 5 deletions
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17
Source/Core/AudioCommon/Src/Mixer.cpp
View file

@ -62,12 +62,12 @@ unsigned int CMixer::Mix(short* samples, unsigned int numSamples)
if (m_sampleRate == 32000)
{
#if _M_SSE >= 0x301
static const __m128i sr_mask =
_mm_set_epi32(0x0C0D0E0FL, 0x08090A0BL,
0x04050607L, 0x00010203L);
if (cpu_info.bSSSE3 && !((numLeft * 2) % 8))
{
static const __m128i sr_mask =
_mm_set_epi32(0x0C0D0E0FL, 0x08090A0BL,
0x04050607L, 0x00010203L);
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[(m_indexR + i) & INDEX_MASK]), sr_mask));
@ -123,7 +123,14 @@ unsigned int CMixer::Mix(short* samples, unsigned int numSamples)
// Padding
if (numSamples > numLeft)
memset(&samples[numLeft * 2], 0, (numSamples - numLeft) * 4);
{
unsigned short s[2];
s[0] = Common::swap16(m_buffer[(m_indexR - 1) & INDEX_MASK]);
s[1] = Common::swap16(m_buffer[(m_indexR - 2) & INDEX_MASK]);
for (unsigned int i = numLeft*2; i < numSamples*2; i+=2)
*(u32*)(samples+i) = *(u32*)(s);
// memset(&samples[numLeft * 2], 0, (numSamples - numLeft) * 4);
}
//when logging, also throttle HLE audio
if (m_logAudio) {

2
Source/Core/AudioCommon/Src/Mixer.h
View file

@ -44,6 +44,8 @@ public:
// So when AI/DAC sample rate differs than 32KHz, we have to do re-sampling
m_sampleRate = BackendSampleRate;
memset(m_buffer, 0, sizeof(m_buffer));
INFO_LOG(AUDIO_INTERFACE, "Mixer is initialized (AISampleRate:%i, DACSampleRate:%i)", AISampleRate, DACSampleRate);
}