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codecs: Add support for the 'VTX' ZX Spectrum chiptunes format.

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This codec requires floating point.

Original author:  Peter Sovietov
Ported to Rockbox:  Roman Skylarov
Further integration and bugfixes:  Solomon Peachy

Change-Id: I781ecd3592dfcdbbc694063334350342534f1d6c
This commit is contained in:
Solomon Peachy 2020-09-26 17:19:07 -04:00
parent 278522f811
commit 4231c2c83f
29 changed files with 1642 additions and 41 deletions
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84
lib/rbcodec/codecs/libayumi/ayumi_render.h Normal file
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#ifndef AYUMI_RENDER_H
#define AYUMI_RENDER_H
#include "ayumi.h"
typedef unsigned char uchar;
typedef unsigned short ushort;
typedef unsigned int uint;
typedef unsigned long ulong;
typedef enum {
VTX_CHIP_AY = 0, /* emulate AY */
VTX_CHIP_YM /* emulate YM */
} vtx_chiptype_t;
typedef enum {
VTX_LAYOUT_MONO = 0,
VTX_LAYOUT_ABC,
VTX_LAYOUT_ACB,
VTX_LAYOUT_BAC,
VTX_LAYOUT_BCA,
VTX_LAYOUT_CAB,
VTX_LAYOUT_CBA,
VTX_LAYOUT_CUSTOM
} vtx_layout_t;
typedef struct {
vtx_chiptype_t chiptype; /* Type of sound chip */
vtx_layout_t layout; /* stereo layout */
uint loop; /* song loop */
uint chipfreq; /* AY chip freq (1773400 for ZX) */
uint playerfreq; /* 50 Hz for ZX, 60 Hz for yamaha */
uint year; /* year song composed */
char *title; /* song title */
char *author; /* song author */
char *from; /* song from */
char *tracker; /* tracker */
char *comment; /* comment */
uint frames; /* number of AY data frames */
} vtx_info_t;
typedef struct {
uchar *lzhdata; /* packed song data */
uint lzhdata_size; /* size of packed data */
uchar *regdata; /* unpacked song data */
uint regdata_size; /* size of unpacked data */
} vtx_data_t;
typedef struct {
uint frame; /* current frame position */
double isr_step;
double isr_counter;
int dc_filter_on;
int is_ym;
double clock_rate;
int sr;
double pan[3];
int is_eqp;
struct ayumi ay; /* ayumi structure */
vtx_data_t data; /* packed & unpacked vtx data */
vtx_info_t info; /* vtx info */
} ayumi_render_t;
int AyumiRender_LoadFile(void *pBlock, uint size);
const char *AyumiRender_GetChipTypeName(vtx_chiptype_t chiptype);
const char *AyumiRender_GetLayoutName(vtx_layout_t layout);
uint AyumiRender_GetPos(void);
uint AyumiRender_GetMaxPos(void);
int AyumiRender_AyInit(vtx_chiptype_t chiptype, uint samplerate, uint chipfreq,
double playerfreq, uint dcfilter);
int AyumiRender_SetLayout(vtx_layout_t layout, uint eqpower);
int AyumiRender_Seek(ulong nSample);
ulong AyumiRender_AySynth(void *pBuffer, ulong nSamples);
#endif /* ifndef AYUMI_RENDER_H */