acb0917556
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@30264 a1c6a512-1295-4272-9138-f99709370657
72 lines
2.2 KiB
C
72 lines
2.2 KiB
C
// Multi-channel sound buffer interface, and basic mono and stereo 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 { buf_count = 3 };
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struct Stereo_Buffer {
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struct Blip_Buffer bufs [buf_count];
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struct channel_t chan;
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int stereo_added;
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int was_stereo;
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unsigned channels_changed_count_;
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long sample_rate_;
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int length_;
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int samples_per_frame_;
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};
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// Initializes Stereo_Buffer structure
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void Buffer_init( struct Stereo_Buffer* this );
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blargg_err_t Buffer_set_sample_rate( struct Stereo_Buffer* this, long, int msec );
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void Buffer_clock_rate( struct Stereo_Buffer* this, long );
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void Buffer_bass_freq( struct Stereo_Buffer* this, int );
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void Buffer_clear( struct Stereo_Buffer* this );
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struct channel_t Buffer_channel( struct Stereo_Buffer* this );
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void Buffer_end_frame( struct Stereo_Buffer* this, blip_time_t ) ICODE_ATTR;
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long Buffer_read_samples( struct Stereo_Buffer* this, blip_sample_t*, long ) ICODE_ATTR;
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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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unsigned Buffer_channels_changed_count( struct Stereo_Buffer* this ) ICODE_ATTR;
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void Buffer_channels_changed( struct Stereo_Buffer* this ) ICODE_ATTR;
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void Buffer_mix_stereo_no_center( struct Stereo_Buffer* this, blip_sample_t*, blargg_long ) ICODE_ATTR;
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void Buffer_mix_stereo( struct Stereo_Buffer* this, blip_sample_t*, blargg_long ) ICODE_ATTR;
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void Buffer_mix_mono( struct Stereo_Buffer* this, blip_sample_t*, blargg_long ) ICODE_ATTR;
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// Number of samples per output frame (1 = mono, 2 = stereo)
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static inline int Buffer_samples_per_frame( struct Stereo_Buffer* this )
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{
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return this->samples_per_frame_;
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}
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// See Blip_Buffer.h
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static inline long Buffer_sample_rate( struct Stereo_Buffer* this )
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{
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return this->sample_rate_;
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}
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// Length of buffer, in milliseconds
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static inline int Buffer_length( struct Stereo_Buffer* this )
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{
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return this->length_;
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}
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#endif
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