From f40bfc9267b13b54e6379dfe7539447662879d24 Mon Sep 17 00:00:00 2001 From: Sean Bartell Date: Sat, 25 Jun 2011 21:32:25 -0400 Subject: Add codecs to librbcodec. MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Change-Id: Id7f4717d51ed02d67cb9f9cb3c0ada4a81843f97 Reviewed-on: http://gerrit.rockbox.org/137 Reviewed-by: Nils Wallménius Tested-by: Nils Wallménius --- lib/rbcodec/codecs/libgme/ay_emu.h | 169 +++++++++++++++++++++++++++++++++++++ 1 file changed, 169 insertions(+) create mode 100644 lib/rbcodec/codecs/libgme/ay_emu.h (limited to 'lib/rbcodec/codecs/libgme/ay_emu.h') diff --git a/lib/rbcodec/codecs/libgme/ay_emu.h b/lib/rbcodec/codecs/libgme/ay_emu.h new file mode 100644 index 0000000000..7334167876 --- /dev/null +++ b/lib/rbcodec/codecs/libgme/ay_emu.h @@ -0,0 +1,169 @@ +// Sinclair Spectrum AY music file emulator + +// Game_Music_Emu 0.6-pre +#ifndef AY_EMU_H +#define AY_EMU_H + +#include "blargg_source.h" + +#include "multi_buffer.h" +#include "z80_cpu.h" +#include "ay_apu.h" +#include "m3u_playlist.h" +#include "track_filter.h" + +// 64K memory to load code and data into before starting track. Caller +// must parse the AY file. +enum { mem_size = 0x10000 }; +enum { ram_addr = 0x4000 }; // where official RAM starts + +// AY file header +enum { header_size = 0x14 }; +struct header_t +{ + byte tag [8]; + byte vers; + byte player; + byte unused [2]; + byte author [2]; + byte comment [2]; + byte max_track; + byte first_track; + byte track_info [2]; +}; + +struct file_t { + struct header_t const* header; + byte const* tracks; + byte const* end; // end of file data +}; + +struct mem_t { + uint8_t padding1 [0x100]; + uint8_t ram [mem_size + 0x100]; +}; + +struct Ay_Emu { + struct file_t file; + + struct Blip_Buffer* beeper_output; + int beeper_delta; + int last_beeper; + int beeper_mask; + + addr_t play_addr; + cpu_time_t play_period; + cpu_time_t next_play; + + int cpc_latch; + bool spectrum_mode; + bool cpc_mode; + + // general + int voice_count; + int const* voice_types; + int mute_mask_; + int tempo; + int gain; + + int sample_rate; + + // track-specific + int current_track; + int track_count; + + int clock_rate_; + unsigned buf_changed_count; + + // M3u Playlist + struct M3u_Playlist m3u; + + // large items + struct setup_t tfilter; + struct Track_Filter track_filter; + + struct Ay_Apu apu; + struct Multi_Buffer stereo_buf; // NULL if using custom buffer + struct Z80_Cpu cpu; + struct mem_t mem; +}; + +// Basic functionality (see Gme_File.h for file loading/track info functions) +void Ay_init( struct Ay_Emu* this ); + +blargg_err_t Ay_load_mem( struct Ay_Emu* this, byte const in [], long size ); + +// Set output sample rate. Must be called only once before loading file. +blargg_err_t Ay_set_sample_rate( struct Ay_Emu* this, int sample_rate ); + +// Start a track, where 0 is the first track. Also clears warning string. +blargg_err_t Ay_start_track( struct Ay_Emu* this, int track ); + +// Generate 'count' samples info 'buf'. Output is in stereo. Any emulation +// errors set warning string, and major errors also end track. +blargg_err_t Ay_play( struct Ay_Emu* this, int count, sample_t* buf ); + + +// Track status/control + +// Number of milliseconds (1000 msec = 1 second) played since beginning of track +int Track_tell( struct Ay_Emu* this ); + +// Seek to new time in track. Seeking backwards or far forward can take a while. +blargg_err_t Track_seek( struct Ay_Emu* this, int msec ); + +// Skip n samples +blargg_err_t Track_skip( struct Ay_Emu* this, int n ); + +// Set start time and length of track fade out. Once fade ends track_ended() returns +// true. Fade time can be changed while track is playing. +void Track_set_fade( struct Ay_Emu* this, int start_msec, int length_msec ); + +// True if a track has reached its end +static inline bool Track_ended( struct Ay_Emu* this ) +{ + return track_ended( &this->track_filter ); +} + +// Disables automatic end-of-track detection and skipping of silence at beginning +static inline void Track_ignore_silence( struct Ay_Emu* this, bool disable ) +{ + this->track_filter.silence_ignored_ = disable; +} + +// Get track length in milliseconds +int Track_get_length( struct Ay_Emu* this, int n ); + +// Sound customization + +// Adjust song tempo, where 1.0 = normal, 0.5 = half speed, 2.0 = double speed. +// Track length as returned by track_info() assumes a tempo of 1.0. +void Sound_set_tempo( struct Ay_Emu* this, int t ); + +// Mute/unmute voice i, where voice 0 is first voice +void Sound_mute_voice( struct Ay_Emu* this, int index, bool mute ); + +// Set muting state of all voices at once using a bit mask, where -1 mutes them all, +// 0 unmutes them all, 0x01 mutes just the first voice, etc. +void Sound_mute_voices( struct Ay_Emu* this, int mask ); + +// Change overall output amplitude, where 1.0 results in minimal clamping. +// Must be called before set_sample_rate(). +static inline void Sound_set_gain( struct Ay_Emu* this, int g ) +{ + assert( !this->sample_rate ); // you must set gain before setting sample rate + this->gain = g; +} + +// Emulation (You shouldn't touch these) +void cpu_out( struct Ay_Emu* this, cpu_time_t, addr_t, int data ); +void cpu_out_( struct Ay_Emu* this, cpu_time_t, addr_t, int data ); +bool run_cpu( struct Ay_Emu* this, cpu_time_t end ); + +static inline void disable_beeper( struct Ay_Emu *this ) +{ + this->beeper_mask = 0; + this->last_beeper = 0; +} + +#endif -- cgit v1.2.3