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// Multi-channel sound buffer interface, stereo and effects buffers
// Blip_Buffer 0.4.1
#ifndef MULTI_BUFFER_H
#define MULTI_BUFFER_H
#include "blargg_common.h"
#include "blip_buffer.h"
// Get indexed channel, from 0 to channel count - 1
struct channel_t {
struct Blip_Buffer* center;
struct Blip_Buffer* left;
struct Blip_Buffer* right;
};
enum { type_index_mask = 0xFF };
enum { wave_type = 0x100, noise_type = 0x200, mixed_type = wave_type | noise_type };
enum { stereo = 2 };
enum { bufs_size = 3 };
// Tracked_Blip_Buffer
struct Tracked_Blip_Buffer {
struct Blip_Buffer blip;
int last_non_silence;
};
void Tracked_init( struct Tracked_Blip_Buffer* this );
unsigned Tracked_non_silent( struct Tracked_Blip_Buffer* this );
void Tracked_remove_all_samples( struct Tracked_Blip_Buffer * this );
int Tracked_read_samples( struct Tracked_Blip_Buffer* this, blip_sample_t [], int );
void Tracked_remove_silence( struct Tracked_Blip_Buffer* this, int );
void Tracked_remove_samples( struct Tracked_Blip_Buffer* this, int );
void Tracked_clear( struct Tracked_Blip_Buffer* this );
void Tracked_end_frame( struct Tracked_Blip_Buffer* this, blip_time_t );
static inline delta_t unsettled( struct Blip_Buffer* this )
{
return this->reader_accum_ >> delta_bits;
}
// Stereo Mixer
struct Stereo_Mixer {
struct Tracked_Blip_Buffer* bufs [3];
int samples_read;
};
void Mixer_init( struct Stereo_Mixer* this );
void Mixer_read_pairs( struct Stereo_Mixer* this, blip_sample_t out [], int count );
typedef struct Tracked_Blip_Buffer buf_t;
// Multi_Buffer
struct Multi_Buffer {
unsigned channels_changed_count_;
int sample_rate_;
int length_;
int channel_count_;
int samples_per_frame_;
int const *channel_types_;
bool immediate_removal_;
buf_t bufs [bufs_size];
struct Stereo_Mixer mixer;
struct channel_t chan;
};
blargg_err_t Buffer_set_channel_count( struct Multi_Buffer* this, int n, int const* types );
// Buffers used for all channels
static inline struct Blip_Buffer* center( struct Multi_Buffer* this ) { return &this->bufs [2].blip; }
static inline struct Blip_Buffer* left( struct Multi_Buffer* this ) { return &this->bufs [0].blip; }
static inline struct Blip_Buffer* right( struct Multi_Buffer* this ) { return &this->bufs [1].blip; }
// Initializes Multi_Buffer structure
void Buffer_init( struct Multi_Buffer* this );
blargg_err_t Buffer_set_sample_rate( struct Multi_Buffer* this, int, int msec );
void Buffer_clock_rate( struct Multi_Buffer* this, int );
void Buffer_bass_freq( struct Multi_Buffer* this, int );
void Buffer_clear( struct Multi_Buffer* this );
void Buffer_end_frame( struct Multi_Buffer* this, blip_time_t ) ICODE_ATTR;
static inline int Buffer_length( struct Multi_Buffer* this )
{
return this->length_;
}
// Count of changes to channel configuration. Incremented whenever
// a change is made to any of the Blip_Buffers for any channel.
static inline unsigned Buffer_channels_changed_count( struct Multi_Buffer* this )
{
return this->channels_changed_count_;
}
static inline void Buffer_disable_immediate_removal( struct Multi_Buffer* this )
{
this->immediate_removal_ = false;
}
static inline int Buffer_sample_rate( struct Multi_Buffer* this )
{
return this->sample_rate_;
}
static inline int Buffer_samples_avail( struct Multi_Buffer* this )
{
return (Blip_samples_avail(&this->bufs [0].blip) - this->mixer.samples_read) * 2;
}
int Buffer_read_samples( struct Multi_Buffer* this, blip_sample_t*, int ) ICODE_ATTR;
struct channel_t Buffer_channel( struct Multi_Buffer* this, int i );
#endif
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