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/nsf_emu.h | 261 ++++++++++++++++++++++++++++++++++++ 1 file changed, 261 insertions(+) create mode 100644 lib/rbcodec/codecs/libgme/nsf_emu.h (limited to 'lib/rbcodec/codecs/libgme/nsf_emu.h') diff --git a/lib/rbcodec/codecs/libgme/nsf_emu.h b/lib/rbcodec/codecs/libgme/nsf_emu.h new file mode 100644 index 0000000000..00bdad4a4e --- /dev/null +++ b/lib/rbcodec/codecs/libgme/nsf_emu.h @@ -0,0 +1,261 @@ +// Nintendo NES/Famicom NSF music file emulator + +// Game_Music_Emu 0.5.5 +#ifndef NSF_EMU_H +#define NSF_EMU_H + +#include "rom_data.h" +#include "multi_buffer.h" +#include "nes_apu.h" +#include "nes_cpu.h" +#include "nsfe_info.h" +#include "m3u_playlist.h" +#include "track_filter.h" + +#ifndef NSF_EMU_APU_ONLY + #include "nes_namco_apu.h" + #include "nes_vrc6_apu.h" + #include "nes_fme7_apu.h" + #include "nes_fds_apu.h" + #include "nes_mmc5_apu.h" + #ifndef NSF_EMU_NO_VRC7 + #include "nes_vrc7_apu.h" + #endif +#endif + +// Sound chip flags +enum { + vrc6_flag = 1 << 0, + vrc7_flag = 1 << 1, + fds_flag = 1 << 2, + mmc5_flag = 1 << 3, + namco_flag = 1 << 4, + fme7_flag = 1 << 5 +}; + +enum { fds_banks = 2 }; +enum { bank_count = fds_banks + 8 }; + +enum { rom_begin = 0x8000 }; +enum { bank_select_addr = 0x5FF8 }; +enum { mem_size = 0x10000 }; + +// cpu sits here when waiting for next call to play routine +enum { idle_addr = 0x5FF6 }; +enum { banks_addr = idle_addr }; +enum { badop_addr = bank_select_addr }; + +enum { low_ram_size = 0x800 }; +enum { sram_size = 0x2000 }; +enum { fdsram_size = 0x6000 }; +enum { fdsram_offset = 0x2000 + page_size + 8 }; +enum { sram_addr = 0x6000 }; +enum { unmapped_size= page_size + 8 }; +enum { max_voices = 32 }; + +// NSF file header +enum { header_size = 0x80 }; +struct header_t +{ + char tag [5]; + byte vers; + byte track_count; + byte first_track; + byte load_addr [2]; + byte init_addr [2]; + byte play_addr [2]; + char game [32]; + char author [32]; + char copyright [32]; + byte ntsc_speed [2]; + byte banks [8]; + byte pal_speed [2]; + byte speed_flags; + byte chip_flags; + byte unused [4]; +}; + +struct Nsf_Emu { + // Play routine timing + nes_time_t next_play; + nes_time_t play_period; + int play_extra; + int play_delay; + struct registers_t saved_state; // of interrupted init routine + + // general + int voice_count; + int voice_types [32]; + int mute_mask_; + int tempo; + int gain; + + int sample_rate; + + // track-specific + int track_count; + int current_track; + + int clock_rate__; + unsigned buf_changed_count; + + // M3u Playlist + struct M3u_Playlist m3u; + + // Larger items at the end + #ifndef NSF_EMU_APU_ONLY + byte mmc5_mul [2]; + + struct Nes_Fds_Apu fds; + struct Nes_Mmc5_Apu mmc5; + struct Nes_Namco_Apu namco; + struct Nes_Vrc6_Apu vrc6; + struct Nes_Fme7_Apu fme7; + #ifndef NSF_EMU_NO_VRC7 + struct Nes_Vrc7_Apu vrc7; + #endif + #endif + + struct Nes_Cpu cpu; + struct Nes_Apu apu; + + // Header for currently loaded file + struct header_t header; + + struct setup_t tfilter; + struct Track_Filter track_filter; + + struct Multi_Buffer stereo_buf; + struct Rom_Data rom; + + // Extended nsf info + struct Nsfe_Info info; + + byte high_ram[fdsram_size + fdsram_offset]; + byte low_ram [low_ram_size]; +}; + +// Basic functionality (see Gme_File.h for file loading/track info functions) + +void Nsf_init( struct Nsf_Emu* this ); +blargg_err_t Nsf_load_mem( struct Nsf_Emu* this, void* data, long size ); +blargg_err_t Nsf_post_load( struct Nsf_Emu* this ); + +// Set output sample rate. Must be called only once before loading file. +blargg_err_t Nsf_set_sample_rate( struct Nsf_Emu* this, int sample_rate ); + +// Start a track, where 0 is the first track. Also clears warning string. +blargg_err_t Nsf_start_track( struct Nsf_Emu* this , int ); + +// Generate 'count' samples info 'buf'. Output is in stereo. Any emulation +// errors set warning string, and major errors also end track. +blargg_err_t Nsf_play( struct Nsf_Emu* this, int count, sample_t* buf ); + +void Nsf_clear_playlist( struct Nsf_Emu* this ); +void Nsf_disable_playlist( struct Nsf_Emu* this, bool b ); // use clear_playlist() + +// Track status/control + +// Number of milliseconds (1000 msec = 1 second) played since beginning of track +int Track_tell( struct Nsf_Emu* this ); + +// Seek to new time in track. Seeking backwards or far forward can take a while. +blargg_err_t Track_seek( struct Nsf_Emu* this, int msec ); + +// Skip n samples +blargg_err_t Track_skip( struct Nsf_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 Nsf_Emu* this, int start_msec, int length_msec ); + +// True if a track has reached its end +static inline bool Track_ended( struct Nsf_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 Nsf_Emu* this, bool disable ) +{ + this->track_filter.silence_ignored_ = disable; +} + +// Get track length in milliseconds +int Track_length( struct Nsf_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 Nsf_Emu* this, int t ); + +// Mute/unmute voice i, where voice 0 is first voice +void Sound_mute_voice( struct Nsf_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 Nsf_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 Nsf_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) + +blargg_err_t run_clocks( struct Nsf_Emu* this, blip_time_t* duration, int ); + +void write_bank( struct Nsf_Emu* this, int index, int data ); +int cpu_read( struct Nsf_Emu* this, addr_t ); +void cpu_write( struct Nsf_Emu* this, addr_t, int ); +addr_t get_addr( byte const [] ); +bool run_cpu_until( struct Nsf_Emu* this, nes_time_t end ); + +// Sets clocks between calls to play routine to p + 1/2 clock +static inline void set_play_period( struct Nsf_Emu* this, int p ) { this->play_period = p; } + +// Time play routine will next be called +static inline nes_time_t play_time( struct Nsf_Emu* this ) { return this->next_play; } + +// Emulates to at least time t. Might emulate a few clocks extra. +void run_until( struct Nsf_Emu* this, nes_time_t t ); + +// Runs cpu to at least time t and returns false, or returns true +// if it encounters illegal instruction (halt). +bool run_cpu_until( struct Nsf_Emu* this, nes_time_t t ); + +// cpu calls through to these to access memory (except instructions) +int read_mem( struct Nsf_Emu* this, addr_t ); +void write_mem( struct Nsf_Emu* this, addr_t, int ); + +// Address of play routine +static inline addr_t play_addr( struct Nsf_Emu* this ) { return get_addr( this->header.play_addr ); } + +// Same as run_until, except emulation stops for any event (routine returned, +// play routine called, illegal instruction). +void run_once( struct Nsf_Emu* this, nes_time_t ); + +// Reads byte as cpu would when executing code. Only works for RAM/ROM, +// NOT I/O like sound chips. +int read_code( struct Nsf_Emu* this, addr_t addr ); + +static inline byte* fdsram( struct Nsf_Emu* this ) { return &this->high_ram [fdsram_offset]; } +static inline byte* sram( struct Nsf_Emu* this ) { return this->high_ram; } +static inline byte* unmapped_code( struct Nsf_Emu* this ) { return &this->high_ram [sram_size]; } + +#ifndef NSF_EMU_APU_ONLY + static inline int fds_enabled( struct Nsf_Emu* this ) { return this->header.chip_flags & fds_flag; } + static inline int vrc6_enabled( struct Nsf_Emu* this ) { return this->header.chip_flags & vrc6_flag; } + #ifndef NSF_EMU_NO_VRC7 + static inline int vrc7_enabled( struct Nsf_Emu* this ) { return this->header.chip_flags & vrc7_flag; } + #endif + static inline int mmc5_enabled( struct Nsf_Emu* this ) { return this->header.chip_flags & mmc5_flag; } + static inline int namco_enabled( struct Nsf_Emu* this ) { return this->header.chip_flags & namco_flag; } + static inline int fme7_enabled( struct Nsf_Emu* this ) { return this->header.chip_flags & fme7_flag; } +#endif + +#endif -- cgit v1.2.3