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plugin-aosdk.c
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plugin-aosdk.c
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "plugin-api.h"
#include "aosdk/ao.h"
#include "aosdk/eng_protos.h"
#define CONTAINER_STRING "PSF Song Archive"
#define CONTAINER_STRING_SIZE 16
#define INDEX_RECORD_SIZE 12
typedef struct
{
uint8_t *dataBuffer;
int dataBufferSize;
int trackCount;
int currentTrack;
int initialized;
} aosdkContext;
typedef int32(*aosdk_start_func)(uint8*, uint32);
typedef int32(*aosdk_gen_func)(int16*, uint32);
/* obviously not thread-safe */
static aosdkContext *currentAosdkContext;
int ao_get_lib(char *pfilename, uint8 **ppbuffer, uint64 *plength)
{
unsigned int offset;
int i;
int found = 0;
unsigned int nameOffset;
char *nameRecord;
unsigned int filePtrOffset = 0;
unsigned int fileSize = 0;
unsigned char *data = currentAosdkContext->dataBuffer;
unsigned char *dataCopy = NULL;
offset = 20;
for (i = 0; i < currentAosdkContext->trackCount; i++)
{
nameOffset =
(data[offset + 8] << 24) |
(data[offset + 9] << 16) |
(data[offset + 10] << 8) |
(data[offset + 11] << 0);
nameRecord = (char*)&data[nameOffset];
/* simulate case-insensitive filesystem */
/* should be a binary search, ideally */
if (strncasecmp(nameRecord, pfilename, strlen(pfilename)) == 0)
{
found = 1;
filePtrOffset =
(data[offset + 0] << 24) |
(data[offset + 1] << 16) |
(data[offset + 2] << 8) |
(data[offset + 3] << 0);
fileSize =
(data[offset + 4] << 24) |
(data[offset + 5] << 16) |
(data[offset + 6] << 8) |
(data[offset + 7] << 0);
break;
}
offset += INDEX_RECORD_SIZE;
}
if (found)
{
dataCopy = (unsigned char*)malloc(fileSize);
memcpy(dataCopy, &data[filePtrOffset], fileSize);
}
*ppbuffer = dataCopy;
*plength = fileSize;
return found;
}
#if 0
/* redirect stubs to interface the Z80 core to the QSF engine */
uint8 memory_read(uint16 addr)
{
return qsf_memory_read(addr);
}
uint8 memory_readop(uint16 addr)
{
return memory_read(addr);
}
uint8 memory_readport(uint16 addr)
{
return qsf_memory_readport(addr);
}
void memory_write(uint16 addr, uint8 byte)
{
qsf_memory_write(addr, byte);
}
void memory_writeport(uint16 addr, uint8 byte)
{
qsf_memory_writeport(addr, byte);
}
#endif
static int AosdkInitPlugin(void *privateData, uint8_t *data, int size)
{
aosdkContext *cxt = (aosdkContext*)privateData;
cxt->dataBuffer = data;
cxt->dataBufferSize = size;
cxt->trackCount = 0;
cxt->currentTrack = 0;
/* check for special container format */
if (cxt->dataBufferSize < CONTAINER_STRING_SIZE ||
strncmp((char*)cxt->dataBuffer, CONTAINER_STRING, CONTAINER_STRING_SIZE) != 0)
cxt->initialized = 0;
else
{
cxt->initialized = 1;
cxt->trackCount =
(cxt->dataBuffer[16] << 24) | (cxt->dataBuffer[17] << 16) |
(cxt->dataBuffer[18] << 8) | (cxt->dataBuffer[19]);
}
return cxt->initialized;
}
static int AosdkStartTrack(void *privateData, int trackNumber,
aosdk_start_func startFunc)
{
aosdkContext *cxt = (aosdkContext*)privateData;
unsigned int offset;
unsigned int fileIndex;
unsigned char *filePtr;
unsigned int fileSize;
unsigned char *dataCopy = NULL;
if (trackNumber == -1)
trackNumber = cxt->currentTrack;
offset = 20 + (trackNumber * INDEX_RECORD_SIZE);
fileIndex =
(cxt->dataBuffer[offset + 0] << 24) |
(cxt->dataBuffer[offset + 1] << 16) |
(cxt->dataBuffer[offset + 2] << 8) |
(cxt->dataBuffer[offset + 3] << 0);
filePtr = &cxt->dataBuffer[fileIndex];
offset += 4;
fileSize =
(cxt->dataBuffer[offset + 0] << 24) |
(cxt->dataBuffer[offset + 1] << 16) |
(cxt->dataBuffer[offset + 2] << 8) |
(cxt->dataBuffer[offset + 3] << 0);
dataCopy = (unsigned char*)malloc(fileSize);
if (dataCopy)
{
memcpy(dataCopy, filePtr, fileSize);
currentAosdkContext = cxt;
if (startFunc(dataCopy, fileSize) != AO_SUCCESS)
return 0;
else
return 1;
}
else
return 0;
}
static int AosdkStartTrackDSF(void *privateData, int trackNumber)
{
return AosdkStartTrack(privateData, trackNumber, dsf_start);
}
static int AosdkStartTrackPSF(void *privateData, int trackNumber)
{
return AosdkStartTrack(privateData, trackNumber, psf_start);
}
static int AosdkStartTrackPSF2(void *privateData, int trackNumber)
{
return AosdkStartTrack(privateData, trackNumber, psf2_start);
}
static int AosdkStartTrackSSF(void *privateData, int trackNumber)
{
return AosdkStartTrack(privateData, trackNumber, ssf_start);
}
static int AosdkGenerateStereoFrames(void *privateData, int16_t *samples,
int frameCount, aosdk_gen_func genFunc)
{
int status;
status = genFunc(samples, frameCount);
return (status == AO_SUCCESS);
}
static int AosdkGenerateStereoFramesDSF(void *privateData, int16_t *samples,
int frameCount)
{
return AosdkGenerateStereoFrames(privateData, samples, frameCount, dsf_gen);
}
static int AosdkGenerateStereoFramesPSF(void *privateData, int16_t *samples,
int frameCount)
{
return AosdkGenerateStereoFrames(privateData, samples, frameCount, psf_gen);
}
static int AosdkGenerateStereoFramesPSF2(void *privateData, int16_t *samples,
int frameCount)
{
return AosdkGenerateStereoFrames(privateData, samples, frameCount, psf2_gen);
}
static int AosdkGenerateStereoFramesSSF(void *privateData, int16_t *samples,
int frameCount)
{
return AosdkGenerateStereoFrames(privateData, samples, frameCount, ssf_gen);
}
static int AosdkGetTrackCount(void *privateData)
{
aosdkContext *cxt = (aosdkContext*)privateData;
return cxt->trackCount;
}
static int AosdkGetCurrentTrack(void *privateData)
{
aosdkContext *cxt = (aosdkContext*)privateData;
return cxt->currentTrack;
}
static int AosdkNextTrack(void *privateData)
{
aosdkContext *cxt = (aosdkContext*)privateData;
cxt->currentTrack = (cxt->currentTrack + 1) % cxt->trackCount;
return cxt->currentTrack;
}
static int AosdkPreviousTrack(void *privateData)
{
aosdkContext *cxt = (aosdkContext*)privateData;
cxt->currentTrack--;
if (cxt->currentTrack < 0)
cxt->currentTrack = cxt->trackCount - 1;
return cxt->currentTrack;
}
static int AosdkGetVoiceCount(void *privateData)
{
/* just claim that there is one master voice */
return 1;
}
static const char* AosdkGetVoiceName(void *privateData, int voiceNumber)
{
return "AOSDK Engine";
}
static int AosdkVoicesCanBeToggled(void *privateData)
{
/* no, individual voices can not be toggled */
return 0;
}
static int AosdkSetVoiceState(void *privateData, int voice, int enabled)
{
return 0;
}
pluginInfo pluginAosdkDSF =
{
.initPlugin = AosdkInitPlugin,
.startTrack = AosdkStartTrackDSF,
.generateStereoFrames = AosdkGenerateStereoFramesDSF,
.getTrackCount = AosdkGetTrackCount,
.getCurrentTrack = AosdkGetCurrentTrack,
.nextTrack = AosdkNextTrack,
.previousTrack = AosdkPreviousTrack,
.getVoiceCount = AosdkGetVoiceCount,
.getVoiceName = AosdkGetVoiceName,
.voicesCanBeToggled = AosdkVoicesCanBeToggled,
.setVoiceState = AosdkSetVoiceState,
.contextSize = sizeof(aosdkContext)
};
pluginInfo pluginAosdkPSF =
{
.initPlugin = AosdkInitPlugin,
.startTrack = AosdkStartTrackPSF,
.generateStereoFrames = AosdkGenerateStereoFramesPSF,
.getTrackCount = AosdkGetTrackCount,
.getCurrentTrack = AosdkGetCurrentTrack,
.nextTrack = AosdkNextTrack,
.previousTrack = AosdkPreviousTrack,
.getVoiceCount = AosdkGetVoiceCount,
.getVoiceName = AosdkGetVoiceName,
.voicesCanBeToggled = AosdkVoicesCanBeToggled,
.setVoiceState = AosdkSetVoiceState,
.contextSize = sizeof(aosdkContext)
};
pluginInfo pluginAosdkPSF2 =
{
.initPlugin = AosdkInitPlugin,
.startTrack = AosdkStartTrackPSF2,
.generateStereoFrames = AosdkGenerateStereoFramesPSF2,
.getTrackCount = AosdkGetTrackCount,
.getCurrentTrack = AosdkGetCurrentTrack,
.nextTrack = AosdkNextTrack,
.previousTrack = AosdkPreviousTrack,
.getVoiceCount = AosdkGetVoiceCount,
.getVoiceName = AosdkGetVoiceName,
.voicesCanBeToggled = AosdkVoicesCanBeToggled,
.setVoiceState = AosdkSetVoiceState,
.contextSize = sizeof(aosdkContext)
};
pluginInfo pluginAosdkSSF =
{
.initPlugin = AosdkInitPlugin,
.startTrack = AosdkStartTrackSSF,
.generateStereoFrames = AosdkGenerateStereoFramesSSF,
.getTrackCount = AosdkGetTrackCount,
.getCurrentTrack = AosdkGetCurrentTrack,
.nextTrack = AosdkNextTrack,
.previousTrack = AosdkPreviousTrack,
.getVoiceCount = AosdkGetVoiceCount,
.getVoiceName = AosdkGetVoiceName,
.voicesCanBeToggled = AosdkVoicesCanBeToggled,
.setVoiceState = AosdkSetVoiceState,
.contextSize = sizeof(aosdkContext)
};