13cbade08a
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@30397 a1c6a512-1295-4272-9138-f99709370657
114 lines
3.5 KiB
C
114 lines
3.5 KiB
C
// Multi-channel sound buffer interface, stereo and effects buffers
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// Blip_Buffer 0.4.1
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#ifndef MULTI_BUFFER_H
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#define MULTI_BUFFER_H
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#include "blargg_common.h"
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#include "blip_buffer.h"
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// Get indexed channel, from 0 to channel count - 1
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struct channel_t {
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struct Blip_Buffer* center;
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struct Blip_Buffer* left;
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struct Blip_Buffer* right;
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};
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enum { type_index_mask = 0xFF };
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enum { wave_type = 0x100, noise_type = 0x200, mixed_type = wave_type | noise_type };
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enum { stereo = 2 };
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enum { bufs_size = 3 };
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// Tracked_Blip_Buffer
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struct Tracked_Blip_Buffer {
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struct Blip_Buffer blip;
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int last_non_silence;
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};
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void Tracked_init( struct Tracked_Blip_Buffer* this );
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unsigned Tracked_non_silent( struct Tracked_Blip_Buffer* this );
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void Tracked_remove_all_samples( struct Tracked_Blip_Buffer * this );
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int Tracked_read_samples( struct Tracked_Blip_Buffer* this, blip_sample_t [], int );
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void Tracked_remove_silence( struct Tracked_Blip_Buffer* this, int );
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void Tracked_remove_samples( struct Tracked_Blip_Buffer* this, int );
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void Tracked_clear( struct Tracked_Blip_Buffer* this );
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void Tracked_end_frame( struct Tracked_Blip_Buffer* this, blip_time_t );
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static inline delta_t unsettled( struct Blip_Buffer* this )
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{
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return this->reader_accum_ >> delta_bits;
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}
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// Stereo Mixer
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struct Stereo_Mixer {
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struct Tracked_Blip_Buffer* bufs [3];
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int samples_read;
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};
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void Mixer_init( struct Stereo_Mixer* this );
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void Mixer_read_pairs( struct Stereo_Mixer* this, blip_sample_t out [], int count );
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typedef struct Tracked_Blip_Buffer buf_t;
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// Multi_Buffer
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struct Multi_Buffer {
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unsigned channels_changed_count_;
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int sample_rate_;
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int length_;
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int channel_count_;
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int samples_per_frame_;
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int const *channel_types_;
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bool immediate_removal_;
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buf_t bufs [bufs_size];
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struct Stereo_Mixer mixer;
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struct channel_t chan;
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};
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blargg_err_t Buffer_set_channel_count( struct Multi_Buffer* this, int n, int const* types );
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// Buffers used for all channels
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static inline struct Blip_Buffer* center( struct Multi_Buffer* this ) { return &this->bufs [2].blip; }
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static inline struct Blip_Buffer* left( struct Multi_Buffer* this ) { return &this->bufs [0].blip; }
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static inline struct Blip_Buffer* right( struct Multi_Buffer* this ) { return &this->bufs [1].blip; }
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// Initializes Multi_Buffer structure
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void Buffer_init( struct Multi_Buffer* this );
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blargg_err_t Buffer_set_sample_rate( struct Multi_Buffer* this, int, int msec );
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void Buffer_clock_rate( struct Multi_Buffer* this, int );
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void Buffer_bass_freq( struct Multi_Buffer* this, int );
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void Buffer_clear( struct Multi_Buffer* this );
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void Buffer_end_frame( struct Multi_Buffer* this, blip_time_t ) ICODE_ATTR;
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static inline int Buffer_length( struct Multi_Buffer* this )
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{
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return this->length_;
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}
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// Count of changes to channel configuration. Incremented whenever
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// a change is made to any of the Blip_Buffers for any channel.
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static inline unsigned Buffer_channels_changed_count( struct Multi_Buffer* this )
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{
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return this->channels_changed_count_;
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}
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static inline void Buffer_disable_immediate_removal( struct Multi_Buffer* this )
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{
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this->immediate_removal_ = false;
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}
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static inline int Buffer_sample_rate( struct Multi_Buffer* this )
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{
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return this->sample_rate_;
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}
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static inline int Buffer_samples_avail( struct Multi_Buffer* this )
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{
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return (Blip_samples_avail(&this->bufs [0].blip) - this->mixer.samples_read) * 2;
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}
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int Buffer_read_samples( struct Multi_Buffer* this, blip_sample_t*, int ) ICODE_ATTR;
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struct channel_t Buffer_channel( struct Multi_Buffer* this, int i );
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#endif
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