seekabilizer_backbuffer

#include <seekabilizer.h>

Public Member Functions
t_size	get_depth () const
t_size	get_max_depth () const
void	initialize (t_size p_size)
void	read (t_size p_backlogdepth, void *p_buffer, t_size p_bytes) const
void	reset ()
void	write (const void *p_buffer, t_size p_bytes)

Private Attributes
pfc::array_t< t_uint8 >	m_buffer
t_size	m_cursor
t_size	m_depth

Detailed Description

Definition at line 1 of file seekabilizer.h.

Member Function Documentation

t_size seekabilizer_backbuffer::get_depth

(

)

const

Definition at line 64 of file seekabilizer.cpp.

{
    return m_depth;
}

t_size seekabilizer_backbuffer::get_max_depth

(

)

const

Definition at line 69 of file seekabilizer.cpp.

{
    return m_buffer.get_size();
}

void seekabilizer_backbuffer::initialize

(

t_size

p_size

)

Definition at line 5 of file seekabilizer.cpp.

{
    m_depth = m_cursor = 0;

    m_buffer.set_size(p_size);
}

void seekabilizer_backbuffer::read	(	t_size	p_backlogdepth,
		void *	p_buffer,
		t_size	p_bytes
	)		const

Definition at line 41 of file seekabilizer.cpp.

{
    assert(p_backlogdepth <= m_depth);
    assert(p_backlogdepth >= p_bytes);

        
    t_uint8* targetptr = (t_uint8*) p_buffer;
    t_size remaining = p_bytes;
    t_size cursor = (m_cursor + m_buffer.get_size() - p_backlogdepth) % m_buffer.get_size();
    
    while(remaining > 0)
    {
        t_size delta = m_buffer.get_size() - cursor;
        if (delta > remaining) delta = remaining;
        
        memcpy(targetptr,m_buffer.get_ptr() + cursor,delta);

        targetptr += delta;
        remaining -= delta;
        cursor = (cursor + delta) % m_buffer.get_size();
    }
}

void seekabilizer_backbuffer::reset

(

)

Definition at line 74 of file seekabilizer.cpp.

{
    m_depth = m_cursor = 0;
}

void seekabilizer_backbuffer::write	(	const void *	p_buffer,
		t_size	p_bytes
	)

Definition at line 12 of file seekabilizer.cpp.

{
    if (p_bytes >= m_buffer.get_size())
    {
        memcpy(m_buffer.get_ptr(),(const t_uint8*)p_buffer + p_bytes - m_buffer.get_size(),m_buffer.get_size());
        m_cursor = 0;
        m_depth = m_buffer.get_size();
    }
    else
    {
        const t_uint8* sourceptr = (const t_uint8*) p_buffer;
        t_size remaining = p_bytes;
        while(remaining > 0)
        {
            t_size delta = m_buffer.get_size() - m_cursor;
            if (delta > remaining) delta = remaining;

            memcpy(m_buffer.get_ptr() + m_cursor,sourceptr,delta);

            sourceptr += delta;
            remaining -= delta;
            m_cursor = (m_cursor + delta) % m_buffer.get_size();

            m_depth = pfc::min_t<t_size>(m_buffer.get_size(),m_depth + delta);
            
        }
    }
}

Field Documentation

pfc::array_t<t_uint8> seekabilizer_backbuffer::m_buffer

private

Definition at line 11 of file seekabilizer.h.

t_size seekabilizer_backbuffer::m_cursor

private

Definition at line 12 of file seekabilizer.h.

t_size seekabilizer_backbuffer::m_depth

private

Definition at line 12 of file seekabilizer.h.

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The documentation for this class was generated from the following files:

• foobar2000/helpers/seekabilizer.h
• foobar2000/helpers/seekabilizer.cpp