From 55cba1db948c3d6650a0d4162ffcd09ca73fe3a1 Mon Sep 17 00:00:00 2001 From: waker Date: Mon, 6 Jul 2009 22:43:23 +0200 Subject: added GME support ; added subtune support --- gme/Multi_Buffer.h | 156 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 156 insertions(+) create mode 100644 gme/Multi_Buffer.h (limited to 'gme/Multi_Buffer.h') diff --git a/gme/Multi_Buffer.h b/gme/Multi_Buffer.h new file mode 100644 index 00000000..a39cca1a --- /dev/null +++ b/gme/Multi_Buffer.h @@ -0,0 +1,156 @@ +// Multi-channel sound buffer interface, and basic mono and stereo buffers + +// Blip_Buffer 0.4.1 +#ifndef MULTI_BUFFER_H +#define MULTI_BUFFER_H + +#include "blargg_common.h" +#include "Blip_Buffer.h" + +// Interface to one or more Blip_Buffers mapped to one or more channels +// consisting of left, center, and right buffers. +class Multi_Buffer { +public: + Multi_Buffer( int samples_per_frame ); + virtual ~Multi_Buffer() { } + + // Set the number of channels available + virtual blargg_err_t set_channel_count( int ); + + // Get indexed channel, from 0 to channel count - 1 + struct channel_t { + Blip_Buffer* center; + Blip_Buffer* left; + Blip_Buffer* right; + }; + enum { type_index_mask = 0xFF }; + enum { wave_type = 0x100, noise_type = 0x200, mixed_type = wave_type | noise_type }; + virtual channel_t channel( int index, int type ) = 0; + + // See Blip_Buffer.h + virtual blargg_err_t set_sample_rate( long rate, int msec = blip_default_length ) = 0; + virtual void clock_rate( long ) = 0; + virtual void bass_freq( int ) = 0; + virtual void clear() = 0; + long sample_rate() const; + + // Length of buffer, in milliseconds + int length() const; + + // See Blip_Buffer.h + virtual void end_frame( blip_time_t ) = 0; + + // Number of samples per output frame (1 = mono, 2 = stereo) + int samples_per_frame() const; + + // Count of changes to channel configuration. Incremented whenever + // a change is made to any of the Blip_Buffers for any channel. + unsigned channels_changed_count() { return channels_changed_count_; } + + // See Blip_Buffer.h + virtual long read_samples( blip_sample_t*, long ) = 0; + virtual long samples_avail() const = 0; + +public: + BLARGG_DISABLE_NOTHROW +protected: + void channels_changed() { channels_changed_count_++; } +private: + // noncopyable + Multi_Buffer( const Multi_Buffer& ); + Multi_Buffer& operator = ( const Multi_Buffer& ); + + unsigned channels_changed_count_; + long sample_rate_; + int length_; + int const samples_per_frame_; +}; + +// Uses a single buffer and outputs mono samples. +class Mono_Buffer : public Multi_Buffer { + Blip_Buffer buf; + channel_t chan; +public: + // Buffer used for all channels + Blip_Buffer* center() { return &buf; } + +public: + Mono_Buffer(); + ~Mono_Buffer(); + blargg_err_t set_sample_rate( long rate, int msec = blip_default_length ); + void clock_rate( long rate ) { buf.clock_rate( rate ); } + void bass_freq( int freq ) { buf.bass_freq( freq ); } + void clear() { buf.clear(); } + long samples_avail() const { return buf.samples_avail(); } + long read_samples( blip_sample_t* p, long s ) { return buf.read_samples( p, s ); } + channel_t channel( int, int ) { return chan; } + void end_frame( blip_time_t t ) { buf.end_frame( t ); } +}; + +// Uses three buffers (one for center) and outputs stereo sample pairs. +class Stereo_Buffer : public Multi_Buffer { +public: + + // Buffers used for all channels + Blip_Buffer* center() { return &bufs [0]; } + Blip_Buffer* left() { return &bufs [1]; } + Blip_Buffer* right() { return &bufs [2]; } + +public: + Stereo_Buffer(); + ~Stereo_Buffer(); + blargg_err_t set_sample_rate( long, int msec = blip_default_length ); + void clock_rate( long ); + void bass_freq( int ); + void clear(); + channel_t channel( int, int ) { return chan; } + void end_frame( blip_time_t ); + + long samples_avail() const { return bufs [0].samples_avail() * 2; } + long read_samples( blip_sample_t*, long ); + +private: + enum { buf_count = 3 }; + Blip_Buffer bufs [buf_count]; + channel_t chan; + int stereo_added; + int was_stereo; + + void mix_stereo_no_center( blip_sample_t*, blargg_long ); + void mix_stereo( blip_sample_t*, blargg_long ); + void mix_mono( blip_sample_t*, blargg_long ); +}; + +// Silent_Buffer generates no samples, useful where no sound is wanted +class Silent_Buffer : public Multi_Buffer { + channel_t chan; +public: + Silent_Buffer(); + blargg_err_t set_sample_rate( long rate, int msec = blip_default_length ) + { + return Multi_Buffer::set_sample_rate( rate, msec ); + } + void clock_rate( long ) { } + void bass_freq( int ) { } + void clear() { } + channel_t channel( int, int ) { return chan; } + void end_frame( blip_time_t ) { } + long samples_avail() const { return 0; } + long read_samples( blip_sample_t*, long ) { return 0; } +}; + + +inline blargg_err_t Multi_Buffer::set_sample_rate( long rate, int msec ) +{ + sample_rate_ = rate; + length_ = msec; + return 0; +} + +inline int Multi_Buffer::samples_per_frame() const { return samples_per_frame_; } + +inline long Multi_Buffer::sample_rate() const { return sample_rate_; } + +inline int Multi_Buffer::length() const { return length_; } + +#endif -- cgit v1.2.3