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#ifndef AUDIOGRAPHER_PROCESS_CONTEXT_H
#define AUDIOGRAPHER_PROCESS_CONTEXT_H
#include <boost/static_assert.hpp>
#include <boost/type_traits.hpp>
#include <boost/format.hpp>
#include "audiographer/visibility.h"
#include "exception.h"
#include "debug_utils.h"
#include "types.h"
#include "flag_field.h"
#include "throwing.h"
#include "type_utils.h"
namespace AudioGrapher
{
/**
* Processing context. Constness only applies to data, not flags
*/
template <typename T = DefaultSampleType>
class /*LIBAUDIOGRAPHER_API*/ ProcessContext
: public Throwing<>
{
// Support older compilers that don't support template base class initialization without template parameters
// This will need to be modified if if it's modified above
static const ThrowLevel throwLevel = DEFAULT_THROW_LEVEL;
BOOST_STATIC_ASSERT (boost::has_trivial_destructor<T>::value);
public:
typedef FlagField::Flag Flag;
enum Flags {
EndOfInput = 0
};
public:
/// Basic constructor with data, sample and channel count
ProcessContext (T * data, samplecnt_t samples, ChannelCount channels)
: _data (data), _samples (samples), _channels (channels)
{ validate_data(); }
/// Normal copy constructor
ProcessContext (ProcessContext<T> const & other)
: Throwing<throwLevel>(), _data (other._data), _samples (other._samples), _channels (other._channels), _flags (other._flags)
{ /* No need to validate data */ }
/// "Copy constructor" with unique data, sample and channel count, but copies flags
template<typename Y>
ProcessContext (ProcessContext<Y> const & other, T * data, samplecnt_t samples, ChannelCount channels)
: Throwing<throwLevel>(), _data (data), _samples (samples), _channels (channels), _flags (other.flags())
{ validate_data(); }
/// "Copy constructor" with unique data and sample count, but copies channel count and flags
template<typename Y>
ProcessContext (ProcessContext<Y> const & other, T * data, samplecnt_t samples)
: Throwing<throwLevel>(), _data (data), _samples (samples), _channels (other.channels()), _flags (other.flags())
{ validate_data(); }
/// "Copy constructor" with unique data, but copies sample and channel count + flags
template<typename Y>
ProcessContext (ProcessContext<Y> const & other, T * data)
: Throwing<throwLevel>(), _data (data), _samples (other.samples()), _channels (other.channels()), _flags (other.flags())
{ /* No need to validate data */ }
/// Make new Context out of the beginning of this context
ProcessContext beginning (samplecnt_t samples)
{
if (throw_level (ThrowProcess) && samples > _samples) {
throw Exception (*this, boost::str (boost::format
("Trying to use too many samples of %1% for a new Context: %2% instead of %3%")
% DebugUtils::demangled_name (*this) % samples % _samples));
}
validate_data ();
return ProcessContext (*this, _data, samples);
}
virtual ~ProcessContext () {}
/// \a data points to the array of data to process
inline T const * data() const { return _data; }
inline T * data() { return _data; }
/// \a samples tells how many samples the array pointed by data contains
inline samplecnt_t const & samples() const { return _samples; }
/** \a channels tells how many interleaved channels \a data contains
* If \a channels is greater than 1, each channel contains \a samples / \a channels samples of data
*/
inline ChannelCount const & channels() const { return _channels; }
/// Returns the amount of samples per channel
inline samplecnt_t samples_per_channel() const { return _samples / _channels; }
/* Flags */
inline bool has_flag (Flag flag) const { return _flags.has (flag); }
inline void set_flag (Flag flag) const { _flags.set (flag); }
inline void remove_flag (Flag flag) const { _flags.remove (flag); }
inline FlagField const & flags () const { return _flags; }
protected:
T * const _data;
samplecnt_t _samples;
ChannelCount _channels;
mutable FlagField _flags;
private:
inline void validate_data()
{
if (throw_level (ThrowProcess) && (_samples % _channels != 0)) {
throw Exception (*this, boost::str (boost::format
("Number of samples given to %1% was not a multiple of channels: %2% samples with %3% channels")
% DebugUtils::demangled_name (*this) % _samples % _channels));
}
}
};
/// A process context that allocates and owns it's data buffer
template <typename T = DefaultSampleType>
class /*LIBAUDIOGRAPHER_API*/ AllocatingProcessContext : public ProcessContext<T>
{
public:
/// Allocates uninitialized memory
AllocatingProcessContext (samplecnt_t samples, ChannelCount channels)
: ProcessContext<T> (new T[samples], samples, channels) {}
/// Allocates and copies data from raw buffer
AllocatingProcessContext (T const * data, samplecnt_t samples, ChannelCount channels)
: ProcessContext<T> (new T[samples], samples, channels)
{ TypeUtils<float>::copy (data, ProcessContext<T>::_data, samples); }
/// Copy constructor, copies data from other ProcessContext
AllocatingProcessContext (ProcessContext<T> const & other)
: ProcessContext<T> (other, new T[other._samples])
{ TypeUtils<float>::copy (ProcessContext<T>::_data, other._data, other._samples); }
/// "Copy constructor" with uninitialized data, unique sample and channel count, but copies flags
template<typename Y>
AllocatingProcessContext (ProcessContext<Y> const & other, samplecnt_t samples, ChannelCount channels)
: ProcessContext<T> (other, new T[samples], samples, channels) {}
/// "Copy constructor" with uninitialized data, unique sample count, but copies channel count and flags
template<typename Y>
AllocatingProcessContext (ProcessContext<Y> const & other, samplecnt_t samples)
: ProcessContext<T> (other, new T[samples], samples, other.channels()) {}
/// "Copy constructor" uninitialized data, that copies sample and channel count + flags
template<typename Y>
AllocatingProcessContext (ProcessContext<Y> const & other)
: ProcessContext<T> (other, new T[other._samples]) {}
~AllocatingProcessContext () { delete [] ProcessContext<T>::_data; }
};
/// A wrapper for a const ProcesContext which can be created from const data
template <typename T = DefaultSampleType>
class /*LIBAUDIOGRAPHER_API*/ ConstProcessContext
{
public:
/// Basic constructor with data, sample and channel count
ConstProcessContext (T const * data, samplecnt_t samples, ChannelCount channels)
: context (const_cast<T *>(data), samples, channels) {}
/// Copy constructor from const ProcessContext
ConstProcessContext (ProcessContext<T> const & other)
: context (const_cast<ProcessContext<T> &> (other)) {}
/// "Copy constructor", with unique data, sample and channel count, but copies flags
template<typename ProcessContext>
ConstProcessContext (ProcessContext const & other, T const * data, samplecnt_t samples, ChannelCount channels)
: context (other, const_cast<T *>(data), samples, channels) {}
/// "Copy constructor", with unique data and sample count, but copies channel count and flags
template<typename ProcessContext>
ConstProcessContext (ProcessContext const & other, T const * data, samplecnt_t samples)
: context (other, const_cast<T *>(data), samples) {}
/// "Copy constructor", with unique data, but copies sample and channel count + flags
template<typename ProcessContext>
ConstProcessContext (ProcessContext const & other, T const * data)
: context (other, const_cast<T *>(data)) {}
inline operator ProcessContext<T> const & () { return context; }
inline ProcessContext<T> const & operator() () { return context; }
inline ProcessContext<T> const * operator& () { return &context; }
private:
ProcessContext<T> const context;
};
} // namespace
#endif // AUDIOGRAPHER_PROCESS_CONTEXT_H
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