1 files changed, 75 insertions, 33 deletions

diff --git a/apps/codecs/libgme/multi_buffer.h b/apps/codecs/libgme/multi_buffer.h
index cfdae4f..e5efa5a 100644
--- a/apps/codecs/libgme/multi_buffer.h
+++ b/apps/codecs/libgme/multi_buffer.h
@@ -1,4 +1,4 @@
-// Multi-channel sound buffer interface, and basic mono and stereo buffers
+// Multi-channel sound buffer interface, stereo and effects buffers
 
 // Blip_Buffer 0.4.1
 #ifndef MULTI_BUFFER_H
@@ -16,57 +16,99 @@ struct channel_t {
 
 enum { type_index_mask = 0xFF };
 enum { wave_type = 0x100, noise_type = 0x200, mixed_type = wave_type | noise_type };
-enum { buf_count = 3 };
-	
-struct Stereo_Buffer {
-	struct Blip_Buffer bufs [buf_count];
-	struct channel_t chan;
-	int stereo_added;
-	int was_stereo;
-	
+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_;
-	long sample_rate_;
+	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;
 };
 
-// Initializes Stereo_Buffer structure
-void Buffer_init( struct Stereo_Buffer* this );
+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; }
 
-blargg_err_t Buffer_set_sample_rate( struct Stereo_Buffer* this, long, int msec );
-void Buffer_clock_rate( struct Stereo_Buffer* this, long );
-void Buffer_bass_freq( struct Stereo_Buffer* this, int );
-void Buffer_clear( struct Stereo_Buffer* this );
-struct channel_t Buffer_channel( struct Stereo_Buffer* this );
-void Buffer_end_frame( struct Stereo_Buffer* this, blip_time_t );
+// Initializes Multi_Buffer structure
+void Buffer_init( struct Multi_Buffer* this );
 
-long Buffer_read_samples( struct Stereo_Buffer* this, blip_sample_t*, long );
+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.
-unsigned Buffer_channels_changed_count( struct Stereo_Buffer* this );
-void Buffer_channels_changed( struct Stereo_Buffer* this );
-
-void Buffer_mix_stereo_no_center( struct Stereo_Buffer* this, blip_sample_t*, blargg_long );
-void Buffer_mix_stereo( struct Stereo_Buffer* this, blip_sample_t*, blargg_long );
-void Buffer_mix_mono( struct Stereo_Buffer* this, blip_sample_t*, blargg_long );
+static inline unsigned Buffer_channels_changed_count( struct Multi_Buffer* this )
+{
+	return this->channels_changed_count_;
+}
 
-// Number of samples per output frame (1 = mono, 2 = stereo)
-static inline int Buffer_samples_per_frame( struct Stereo_Buffer* this )
+static inline void Buffer_disable_immediate_removal( struct Multi_Buffer* this )
 {
-	return this->samples_per_frame_;
+	this->immediate_removal_ = false;
 }
 
-// See Blip_Buffer.h
-static inline long Buffer_sample_rate( struct Stereo_Buffer* this )
+static inline int Buffer_sample_rate( struct Multi_Buffer* this )
 {
 	return this->sample_rate_;
 }
 
-// Length of buffer, in milliseconds
-static inline int Buffer_length( struct Stereo_Buffer* this )
+static inline int Buffer_samples_avail( struct Multi_Buffer* this )
 {
-	return this->length_;
+	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