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/vgm_emu.h | 206 ++++++++++++++++++++++++++++++++++++ 1 file changed, 206 insertions(+) create mode 100644 lib/rbcodec/codecs/libgme/vgm_emu.h (limited to 'lib/rbcodec/codecs/libgme/vgm_emu.h') diff --git a/lib/rbcodec/codecs/libgme/vgm_emu.h b/lib/rbcodec/codecs/libgme/vgm_emu.h new file mode 100644 index 0000000000..8c39482008 --- /dev/null +++ b/lib/rbcodec/codecs/libgme/vgm_emu.h @@ -0,0 +1,206 @@ +// Sega Master System/Mark III, Sega Genesis/Mega Drive, BBC Micro VGM music file emulator + +// Game_Music_Emu 0.6-pre +#ifndef VGM_EMU_H +#define VGM_EMU_H + +#include "blargg_common.h" +#include "blargg_source.h" + +#include "track_filter.h" +#include "resampler.h" +#include "multi_buffer.h" +#include "ym2413_emu.h" +#include "ym2612_emu.h" +#include "sms_apu.h" + +typedef int vgm_time_t; +typedef int fm_time_t; + +enum { fm_time_bits = 12 }; +enum { blip_time_bits = 12 }; + +// VGM header format +enum { header_size = 0x40 }; +struct header_t +{ + char tag [4]; + byte data_size [4]; + byte version [4]; + byte psg_rate [4]; + byte ym2413_rate [4]; + byte gd3_offset [4]; + byte track_duration [4]; + byte loop_offset [4]; + byte loop_duration [4]; + byte frame_rate [4]; + byte noise_feedback [2]; + byte noise_width; + byte unused1; + byte ym2612_rate [4]; + byte ym2151_rate [4]; + byte data_offset [4]; + byte unused2 [8]; +}; + +enum { gme_max_field = 63 }; +struct track_info_t +{ + /* times in milliseconds; -1 if unknown */ + int length; + int intro_length; + int loop_length; + + /* empty string if not available */ + char game [64]; + char song [96]; + char author [64]; +}; + +// Emulates VGM music using SN76489/SN76496 PSG, YM2612, and YM2413 FM sound chips. +// Supports custom sound buffer and frequency equalization when VGM uses just the PSG. +// FM sound chips can be run at their proper rates, or slightly higher to reduce +// aliasing on high notes. Currently YM2413 support requires that you supply a +// YM2413 sound chip emulator. I can provide one I've modified to work with the library. +struct Vgm_Emu { + int fm_rate; + int psg_rate; + int vgm_rate; + bool disable_oversampling; + + int fm_time_offset; + int fm_time_factor; + + int blip_time_factor; + + byte const* file_begin; + byte const* file_end; + + vgm_time_t vgm_time; + byte const* loop_begin; + byte const* pos; + + byte const* pcm_data; + byte const* pcm_pos; + int dac_amp; + int dac_disabled; // -1 if disabled + + // general + int current_track; + int clock_rate_; + unsigned buf_changed_count; + int max_initial_silence; + int voice_count; + int const *voice_types; + int mute_mask_; + int tempo; + int gain; + + int sample_rate; + + // larger items at the end + struct track_info_t info; + + struct setup_t tfilter; + struct Track_Filter track_filter; + + struct Ym2612_Emu ym2612; + struct Ym2413_Emu ym2413; + + struct Sms_Apu psg; + struct Blip_Synth pcm; + struct Blip_Buffer blip_buf; + + struct Resampler resampler; + struct Multi_Buffer stereo_buf; +}; + +void Vgm_init( struct Vgm_Emu* this ); + +// Disable running FM chips at higher than normal rate. Will result in slightly +// more aliasing of high notes. +static inline void Vgm_disable_oversampling( struct Vgm_Emu* this, bool disable ) { this->disable_oversampling = disable; } + +// Header for currently loaded file +static inline struct header_t *header( struct Vgm_Emu* this ) { return (struct header_t*) this->file_begin; } + +// Basic functionality (see Gme_File.h for file loading/track info functions) +blargg_err_t Vgm_load_mem( struct Vgm_Emu* this, byte const* new_data, long new_size, bool parse_info ); + +// True if any FM chips are used by file. Always false until init_fm() +// is called. +static inline bool uses_fm( struct Vgm_Emu* this ) { return Ym2612_enabled( &this->ym2612 ) || Ym2413_enabled( &this->ym2413 ); } + +// Set output sample rate. Must be called only once before loading file. +blargg_err_t Vgm_set_sample_rate( struct Vgm_Emu* this, int sample_rate ); + +// Start a track, where 0 is the first track. Also clears warning string. +blargg_err_t Vgm_start_track( struct Vgm_Emu* this ); + +// Generate 'count' samples info 'buf'. Output is in stereo. Any emulation +// errors set warning string, and major errors also end track. +blargg_err_t Vgm_play( struct Vgm_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 Vgm_Emu* this ); + +// Seek to new time in track. Seeking backwards or far forward can take a while. +blargg_err_t Track_seek( struct Vgm_Emu* this, int msec ); + +// Skip n samples +blargg_err_t Track_skip( struct Vgm_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 Vgm_Emu* this, int start_msec, int length_msec ); + +// True if a track has reached its end +static inline bool Track_ended( struct Vgm_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 Vgm_Emu* this, bool disable ) +{ + this->track_filter.silence_ignored_ = disable; +} + +// Get track length in milliseconds +static inline int Track_get_length( struct Vgm_Emu* this ) +{ + int length = this->info.length; + if ( length <= 0 ) + { + length = this->info.intro_length + 2 * this->info.loop_length; // intro + 2 loops + if ( length <= 0 ) + length = 150 * 1000; // 2.5 minutes + } + + return length; +} + +// 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 Vgm_Emu* this, int t ); + +// Mute/unmute voice i, where voice 0 is first voice +void Sound_mute_voice( struct Vgm_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 Vgm_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 Vgm_Emu* this, int g ) +{ + assert( !this->sample_rate ); // you must set gain before setting sample rate + this->gain = g; +} + +#endif -- cgit v1.2.3