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droplay.c
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droplay.c
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//
// Copyright(C) 2005-2014 Simon Howard
// Copyright(C) 2020 Fabian Herb
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// DESCRIPTION:
// Demonstration program for OPL library to play back DRO
// format files.
//
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <SDL.h>
#include "opl3.h"
const char* HEADER_STRING = "DBRAWOPL";
static opl3_chip chip;
static SDL_mutex* chipMutex = NULL;
static SDL_AudioDeviceID audioDevice;
void WriteReg(int bank, unsigned int reg, unsigned int val)
{
SDL_LockMutex(chipMutex);
OPL3_WriteRegBuffered(&chip, (bank << 8) | reg, val);
SDL_UnlockMutex(chipMutex);
}
void AudioCallback(void* userdata, Uint8* stream, int len)
{
SDL_LockMutex(chipMutex);
OPL3_GenerateStream(&chip, (int16_t*)stream, len / 4);
SDL_UnlockMutex(chipMutex);
}
void Init(void)
{
if (SDL_Init(SDL_INIT_TIMER | SDL_INIT_AUDIO) < 0)
{
fprintf(stderr, "Unable to initialise SDL\n");
exit(1);
}
chipMutex = SDL_CreateMutex();
OPL3_Reset(&chip, 49716);
SDL_AudioSpec want, have;
SDL_memset(&want, 0, sizeof(want)); /* or SDL_zero(want) */
want.freq = 48000;
want.format = AUDIO_S16SYS;
want.channels = 2;
want.samples = 256;
want.callback = AudioCallback;
audioDevice = SDL_OpenAudioDevice(NULL, 0, &want, &have, SDL_AUDIO_ALLOW_FORMAT_CHANGE);
if(audioDevice == 0)
{
fprintf(stderr, "Unable to open audio device\n");
exit(1);
}
SDL_PauseAudioDevice(audioDevice, 0);
}
void Exit()
{
SDL_CloseAudioDevice(audioDevice);
SDL_DestroyMutex(chipMutex);
SDL_Quit();
}
struct Dro2Header
{
uint32_t lengthPairs;
uint32_t lengthMs;
uint8_t hardwareType; // Flag listing the hardware used in the song
uint8_t format; // Data arrangement
uint8_t compression; // Compression type, zero means no compression (currently only zero is used)
uint8_t shortDelayCode; // Command code for short delay (1-256ms)
uint8_t longDelayCode; // Command code for short delay (> 256ms)
uint8_t codemapLength; // Number of entries in codemap table
uint8_t codemap[128];
};
struct timer_data
{
int running;
FILE* fstream;
struct Dro2Header dro2Header;
int dro1Bank;
};
Uint32 Dro1TimerCallback(Uint32 interval, void *data)
{
struct timer_data *timer_data = data;
if (!timer_data->running)
{
return 0;
}
// Read data until we must make a delay.
for (;;)
{
// End of file?
if (feof(timer_data->fstream))
{
timer_data->running = 0;
return 0;
}
int reg = fgetc(timer_data->fstream);
int val = fgetc(timer_data->fstream);
// Register value of 0 or 1 indicates a delay.
if (reg == 0x00)
{
return val;
}
else if (reg == 0x01)
{
val |= (fgetc(timer_data->fstream) << 8);
return val;
}
else if(reg == 0x02)
{
timer_data->dro1Bank = 0;
}
else if(reg == 0x03)
timer_data->dro1Bank = 1;
else if(reg == 0x04)
{
reg = val;
val = fgetc(timer_data->fstream);
WriteReg(timer_data->dro1Bank, reg, val);
}
else
{
WriteReg(timer_data->dro1Bank, reg, val);
}
}
return 0;
}
Uint32 Dro2TimerCallback(Uint32 interval, void* data)
{
struct timer_data* timerData = data;
while(1)
{
// End of file?
if (feof(timerData->fstream))
{
timerData->running = 0;
return 0;
}
int code = fgetc(timerData->fstream);
int val = fgetc(timerData->fstream);
if(code == timerData->dro2Header.shortDelayCode)
return val + 1;
else if(code == timerData->dro2Header.longDelayCode)
return (val + 1) * 256;
else
{
int reg = timerData->dro2Header.codemap[code & 0x7f];
WriteReg(code >> 7, reg, val);
}
}
}
void PlayFile(char *filename)
{
struct timer_data timer_data;
char buf[8];
timer_data.fstream = fopen(filename, "rb");
if (timer_data.fstream == NULL)
{
fprintf(stderr, "Failed to open %s\n", filename);
exit(EXIT_FAILURE);
}
if (fread(buf, 1, 8, timer_data.fstream) < 8)
{
fprintf(stderr, "Failed to read file header\n");
exit(EXIT_FAILURE);
}
if (strncmp(buf, HEADER_STRING, 8) != 0)
{
fprintf(stderr, "Invalid file format\n");
exit(EXIT_FAILURE);
}
uint16_t version[2];
if (fread(version, 1, 4, timer_data.fstream) < 4)
{
fprintf(stderr, "Failed to read file version\n");
exit(EXIT_FAILURE);
}
if(version[0] == 0 && version[1] == 1)
{
fseek(timer_data.fstream, 28, SEEK_SET);
timer_data.running = 1;
timer_data.dro1Bank = 0;
// Start callback loop sequence.
SDL_AddTimer(0, Dro1TimerCallback, &timer_data);
}
else if(version[0] == 2 && version[1] == 0)
{
if(fread(&timer_data.dro2Header, 14, 1, timer_data.fstream) != 1)
{
fprintf(stderr, "Could not read DROv2 header\n");
exit(EXIT_FAILURE);
}
if(timer_data.dro2Header.codemapLength > 128)
{
fprintf(stderr, "Too many codemap entries (%i)\n", timer_data.dro2Header.codemapLength);
exit(EXIT_FAILURE);
}
if(fread(&timer_data.dro2Header.codemap, 1, timer_data.dro2Header.codemapLength, timer_data.fstream) != timer_data.dro2Header.codemapLength)
{
fprintf(stderr, "Could not read codemap\n");
exit(EXIT_FAILURE);
}
timer_data.running = 1;
SDL_AddTimer(0, Dro2TimerCallback, &timer_data);
}
else
{
fprintf(stderr, "Unrecognized DRO file version \"%i.%i\"\n", version[0], version[1]);
exit(EXIT_FAILURE);
}
// Sleep until the playback finishes.
while(timer_data.running)
SDL_Delay(100);
fclose(timer_data.fstream);
}
int main(int argc, char *argv[])
{
if (argc < 2)
{
printf("Usage: %s <filename>\n", argv[0]);
return EXIT_FAILURE;
}
Init();
PlayFile(argv[1]);
Exit();
return EXIT_SUCCESS;
}