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// Internal stuff here to keep public header uncluttered
// Blip_Buffer 0.4.0
#ifndef BLIP_BUFFER_IMPL2_H
#define BLIP_BUFFER_IMPL2_H
//// Compatibility
BLARGG_DEPRECATED( int const blip_low_quality = 8; )
BLARGG_DEPRECATED( int const blip_med_quality = 8; )
BLARGG_DEPRECATED( int const blip_good_quality = 12; )
BLARGG_DEPRECATED( int const blip_high_quality = 16; )
BLARGG_DEPRECATED( int const blip_sample_max = 32767; )
// Number of bits in raw sample that covers normal output range. Less than 32 bits to give
// extra amplitude range. That is,
// +1 << (blip_sample_bits-1) = +1.0
// -1 << (blip_sample_bits-1) = -1.0
int const blip_sample_bits = 30;
//// BLIP_READER_
//// Optimized reading from Blip_Buffer, for use in custom sample buffer or mixer
// Begins reading from buffer. Name should be unique to the current {} block.
#define BLIP_READER_BEGIN( name, blip_buffer ) \
const Blip_Buffer::delta_t* BLARGG_RESTRICT name##_reader_buf = (blip_buffer).read_pos();\
int name##_reader_accum = (blip_buffer).integrator()
// Gets value to pass to BLIP_READER_NEXT()
#define BLIP_READER_BASS( blip_buffer ) (blip_buffer).highpass_shift()
// Constant value to use instead of BLIP_READER_BASS(), for slightly more optimal
// code at the cost of having no bass_freq() functionality
int const blip_reader_default_bass = 9;
// Current sample as 16-bit signed value
#define BLIP_READER_READ( name ) (name##_reader_accum >> (blip_sample_bits - 16))
// Current raw sample in full internal resolution
#define BLIP_READER_READ_RAW( name ) (name##_reader_accum)
// Advances to next sample
#define BLIP_READER_NEXT( name, bass ) \
(void) (name##_reader_accum += *name##_reader_buf++ - (name##_reader_accum >> (bass)))
// Ends reading samples from buffer. The number of samples read must now be removed
// using Blip_Buffer::remove_samples().
#define BLIP_READER_END( name, blip_buffer ) \
(void) ((blip_buffer).set_integrator( name##_reader_accum ))
#define BLIP_READER_ADJ_( name, offset ) (name##_reader_buf += offset)
int const blip_reader_idx_factor = sizeof (Blip_Buffer::delta_t);
#define BLIP_READER_NEXT_IDX_( name, bass, idx ) {\
name##_reader_accum -= name##_reader_accum >> (bass);\
name##_reader_accum += name##_reader_buf [(idx)];\
}
#define BLIP_READER_NEXT_RAW_IDX_( name, bass, idx ) {\
name##_reader_accum -= name##_reader_accum >> (bass);\
name##_reader_accum +=\
*(Blip_Buffer::delta_t const*) ((char const*) name##_reader_buf + (idx));\
}
//// BLIP_CLAMP
#if defined (_M_IX86) || defined (_M_IA64) || defined (__i486__) || \
defined (__x86_64__) || defined (__ia64__) || defined (__i386__)
#define BLIP_X86 1
#define BLIP_CLAMP_( in ) in < -0x8000 || 0x7FFF < in
#else
#define BLIP_CLAMP_( in ) (blip_sample_t) in != in
#endif
// Clamp sample to blip_sample_t range
#define BLIP_CLAMP( sample, out )\
{ if ( BLIP_CLAMP_( (sample) ) ) (out) = ((sample) >> 31) ^ 0x7FFF; }
//// Blip_Synth
// (in >> sh & mask) * mul
#define BLIP_SH_AND_MUL( in, sh, mask, mul ) \
((int) (in) / ((1U << (sh)) / (mul)) & (unsigned) ((mask) * (mul)))
// (T*) ptr + (off >> sh)
#define BLIP_PTR_OFF_SH( T, ptr, off, sh ) \
((T*) (BLIP_SH_AND_MUL( off, sh, -1, sizeof (T) ) + (char*) (ptr)))
template<int quality,int range>
inline void Blip_Synth<quality,range>::offset_resampled( blip_resampled_time_t time,
int delta, Blip_Buffer* blip_buf ) const
{
#if BLIP_BUFFER_FAST
int const half_width = 1;
#else
int const half_width = quality / 2;
#endif
Blip_Buffer::delta_t* BLARGG_RESTRICT buf = blip_buf->delta_at( time );
delta *= impl.delta_factor;
int const phase_shift = BLIP_BUFFER_ACCURACY - BLIP_PHASE_BITS;
int const phase = (half_width & (half_width - 1)) ?
(int) BLIP_SH_AND_MUL( time, phase_shift, blip_res - 1, sizeof (coeff_t) ) * half_width :
(int) BLIP_SH_AND_MUL( time, phase_shift, blip_res - 1, sizeof (coeff_t) * half_width );
#if BLIP_BUFFER_FAST
int left = buf [0] + delta;
// Kind of crappy, but doing shift after multiply results in overflow.
// Alternate way of delaying multiply by delta_factor results in worse
// sub-sample resolution.
int right = (delta >> BLIP_PHASE_BITS) * phase;
#if BLIP_BUFFER_NOINTERP
// TODO: remove? (just a hack to see how it sounds)
right = 0;
#endif
left -= right;
right += buf [1];
buf [0] = left;
buf [1] = right;
#else
int const fwd = -quality / 2;
int const rev = fwd + quality - 2;
coeff_t const* BLARGG_RESTRICT imp = (coeff_t const*) ((char const*) phases + phase);
int const phase2 = phase + phase - (blip_res - 1) * half_width * sizeof (coeff_t);
#define BLIP_MID_IMP imp = (coeff_t const*) ((char const*) imp - phase2);
#if BLIP_MAX_QUALITY > 16
// General version for any quality
if ( quality != 8 && quality != 12 && quality != 16 )
{
buf += fwd;
// left half
for ( int n = half_width / 2; --n >= 0; )
{
buf [0] += imp [0] * delta;
buf [1] += imp [1] * delta;
imp += 2;
buf += 2;
}
// mirrored right half
BLIP_MID_IMP
for ( int n = half_width / 2; --n >= 0; )
{
buf [0] += imp [-1] * delta;
buf [1] += *(imp -= 2) * delta;
buf += 2;
}
return;
}
#endif
// Unrolled versions for qualities 8, 12, and 16
#if BLIP_X86
// This gives better code for x86
#define BLIP_ADD( out, in ) \
buf [out] += imp [in] * delta
#define BLIP_FWD( i ) {\
BLIP_ADD( fwd + i, i );\
BLIP_ADD( fwd + 1 + i, i + 1 );\
}
#define BLIP_REV( r ) {\
BLIP_ADD( rev - r, r + 1 );\
BLIP_ADD( rev + 1 - r, r );\
}
BLIP_FWD( 0 )
BLIP_FWD( 2 )
if ( quality > 8 ) BLIP_FWD( 4 )
if ( quality > 12 ) BLIP_FWD( 6 )
BLIP_MID_IMP
if ( quality > 12 ) BLIP_REV( 6 )
if ( quality > 8 ) BLIP_REV( 4 )
BLIP_REV( 2 )
BLIP_REV( 0 )
#else
// Help RISC processors and simplistic compilers by reading ahead of writes
#define BLIP_FWD( i ) {\
int t0 = i0 * delta + buf [fwd + i];\
int t1 = imp [i + 1] * delta + buf [fwd + 1 + i];\
i0 = imp [i + 2];\
buf [fwd + i] = t0;\
buf [fwd + 1 + i] = t1;\
}
#define BLIP_REV( r ) {\
int t0 = i0 * delta + buf [rev - r];\
int t1 = imp [r] * delta + buf [rev + 1 - r];\
i0 = imp [r - 1];\
buf [rev - r] = t0;\
buf [rev + 1 - r] = t1;\
}
int i0 = *imp;
BLIP_FWD( 0 )
if ( quality > 8 ) BLIP_FWD( 2 )
if ( quality > 12 ) BLIP_FWD( 4 )
{
int const mid = half_width - 1;
int t0 = i0 * delta + buf [fwd + mid - 1];
int t1 = imp [mid] * delta + buf [fwd + mid ];
BLIP_MID_IMP
i0 = imp [mid];
buf [fwd + mid - 1] = t0;
buf [fwd + mid ] = t1;
}
if ( quality > 12 ) BLIP_REV( 6 )
if ( quality > 8 ) BLIP_REV( 4 )
BLIP_REV( 2 )
int t0 = i0 * delta + buf [rev ];
int t1 = *imp * delta + buf [rev + 1];
buf [rev ] = t0;
buf [rev + 1] = t1;
#endif
#endif
}
template<int quality,int range>
#if BLIP_BUFFER_FAST
inline
#endif
void Blip_Synth<quality,range>::offset( blip_time_t t, int delta, Blip_Buffer* buf ) const
{
offset_resampled( buf->to_fixed( t ), delta, buf );
}
template<int quality,int range>
#if BLIP_BUFFER_FAST
inline
#endif
void Blip_Synth<quality,range>::update( blip_time_t t, int amp )
{
int delta = amp - impl.last_amp;
impl.last_amp = amp;
offset_resampled( impl.buf->to_fixed( t ), delta, impl.buf );
}
//// blip_eq_t
inline blip_eq_t::blip_eq_t( double t ) :
treble( t ), kaiser( 5.2 ), rolloff_freq( 0 ), sample_rate( 44100 ), cutoff_freq( 0 ) { }
inline blip_eq_t::blip_eq_t( double t, int rf, int sr, int cf, double k ) :
treble( t ), kaiser( k ), rolloff_freq( rf ), sample_rate( sr ), cutoff_freq( cf ) { }
//// Blip_Buffer
inline int Blip_Buffer::length() const { return length_; }
inline int Blip_Buffer::samples_avail() const { return (int) (offset_ >> BLIP_BUFFER_ACCURACY); }
inline int Blip_Buffer::sample_rate() const { return sample_rate_; }
inline int Blip_Buffer::output_latency() const { return BLIP_MAX_QUALITY / 2; }
inline int Blip_Buffer::clock_rate() const { return clock_rate_; }
inline void Blip_Buffer::clock_rate( int cps ) { factor_ = clock_rate_factor( clock_rate_ = cps ); }
inline void Blip_Buffer::remove_silence( int count )
{
// fails if you try to remove more samples than available
assert( count <= samples_avail() );
offset_ -= (blip_resampled_time_t) count << BLIP_BUFFER_ACCURACY;
}
#endif
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