1 files changed, 114 insertions, 0 deletions

diff --git a/lib/rbcodec/codecs/libgme/multi_buffer.h b/lib/rbcodec/codecs/libgme/multi_buffer.h
new file mode 100644
index 0000000000..e5efa5a230
--- /dev/null
+++ b/lib/rbcodec/codecs/libgme/multi_buffer.h
@@ -0,0 +1,114 @@
+// 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