mirror of
https://github.com/dborth/snes9xgx.git
synced 2024-12-27 11:41:49 +01:00
442 lines
8.7 KiB
C++
442 lines
8.7 KiB
C++
/*****************************************************************************\
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Snes9x - Portable Super Nintendo Entertainment System (TM) emulator.
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This file is licensed under the Snes9x License.
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For further information, consult the LICENSE file in the root directory.
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\*****************************************************************************/
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#include "snes9x.h"
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#include "memmap.h"
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#include "display.h"
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#include "msu1.h"
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#include "apu/blargg_endian.h"
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#include <fstream>
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#include <sys/stat.h>
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STREAM dataStream = NULL;
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STREAM audioStream = NULL;
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uint32 audioLoopPos;
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size_t partial_frames;
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// Sample buffer
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int16 *bufPos, *bufBegin, *bufEnd;
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#ifdef UNZIP_SUPPORT
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static int unzFindExtension(unzFile &file, const char *ext, bool restart = TRUE, bool print = TRUE, bool allowExact = FALSE)
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{
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unz_file_info info;
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int port, l = strlen(ext), e = allowExact ? 0 : 1;
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if (restart)
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port = unzGoToFirstFile(file);
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else
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port = unzGoToNextFile(file);
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while (port == UNZ_OK)
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{
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int len;
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char name[132];
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unzGetCurrentFileInfo(file, &info, name, 128, NULL, 0, NULL, 0);
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len = strlen(name);
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if (len >= l + e && strcasecmp(name + len - l, ext) == 0 && unzOpenCurrentFile(file) == UNZ_OK)
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{
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if (print)
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printf("Using msu file %s", name);
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return (port);
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}
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port = unzGoToNextFile(file);
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}
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return (port);
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}
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#endif
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STREAM S9xMSU1OpenFile(const char *msu_ext, bool skip_unpacked)
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{
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#ifdef GEKKO
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char filename[1024];
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sprintf(filename, "%s%s%s", Memory.ROMFilePath, Memory.ROMFilename, msu_ext);
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#else
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const char *filename = S9xGetFilename(msu_ext, ROMFILENAME_DIR);
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#endif
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STREAM file = 0;
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if (!skip_unpacked)
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{
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file = OPEN_STREAM(filename, "rb");
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if (file)
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printf("Using msu file %s.\n", filename);
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}
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#ifdef UNZIP_SUPPORT
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// look for msu1 pack file in the rom or patch dir if msu data file not found in rom dir
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if (!file)
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{
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const char *zip_filename = S9xGetFilename(".msu1", ROMFILENAME_DIR);
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unzFile unzFile = unzOpen(zip_filename);
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if (!unzFile)
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{
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zip_filename = S9xGetFilename(".msu1", PATCH_DIR);
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unzFile = unzOpen(zip_filename);
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}
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if (unzFile)
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{
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int port = unzFindExtension(unzFile, msu_ext, true, true, true);
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if (port == UNZ_OK)
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{
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printf(" in %s.\n", zip_filename);
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file = new unzStream(unzFile);
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}
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else
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unzClose(unzFile);
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}
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}
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#endif
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return file;
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}
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static void AudioClose()
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{
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if (audioStream)
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{
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CLOSE_STREAM(audioStream);
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audioStream = NULL;
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}
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}
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static bool AudioOpen()
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{
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MSU1.MSU1_STATUS |= AudioError;
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AudioClose();
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char ext[_MAX_EXT];
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snprintf(ext, _MAX_EXT, "-%d.pcm", MSU1.MSU1_CURRENT_TRACK);
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audioStream = S9xMSU1OpenFile(ext);
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if (audioStream)
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{
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if (GETC_STREAM(audioStream) != 'M')
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return false;
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if (GETC_STREAM(audioStream) != 'S')
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return false;
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if (GETC_STREAM(audioStream) != 'U')
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return false;
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if (GETC_STREAM(audioStream) != '1')
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return false;
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READ_STREAM((char *)&audioLoopPos, 4, audioStream);
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audioLoopPos = GET_LE32(&audioLoopPos);
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audioLoopPos <<= 2;
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audioLoopPos += 8;
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MSU1.MSU1_AUDIO_POS = 8;
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MSU1.MSU1_STATUS &= ~AudioError;
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return true;
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}
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return false;
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}
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static void DataClose()
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{
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if (dataStream)
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{
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CLOSE_STREAM(dataStream);
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dataStream = NULL;
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}
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}
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static bool DataOpen()
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{
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DataClose();
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dataStream = S9xMSU1OpenFile(".msu");
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if(!dataStream)
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dataStream = S9xMSU1OpenFile("msu1.rom");
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return dataStream != NULL;
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}
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void S9xResetMSU(void)
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{
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MSU1.MSU1_STATUS = 0;
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MSU1.MSU1_DATA_SEEK = 0;
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MSU1.MSU1_DATA_POS = 0;
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MSU1.MSU1_TRACK_SEEK = 0;
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MSU1.MSU1_CURRENT_TRACK = 0;
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MSU1.MSU1_RESUME_TRACK = 0;
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MSU1.MSU1_VOLUME = 0;
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MSU1.MSU1_CONTROL = 0;
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MSU1.MSU1_AUDIO_POS = 0;
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MSU1.MSU1_RESUME_POS = 0;
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bufPos = 0;
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bufBegin = 0;
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bufEnd = 0;
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partial_frames = 0;
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DataClose();
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AudioClose();
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Settings.MSU1 = S9xMSU1ROMExists();
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}
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void S9xMSU1Init(void)
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{
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DataOpen();
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}
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void S9xMSU1DeInit(void)
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{
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DataClose();
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AudioClose();
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}
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bool S9xMSU1ROMExists(void)
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{
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STREAM s = S9xMSU1OpenFile(".msu");
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if (s)
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{
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CLOSE_STREAM(s);
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return true;
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}
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#ifdef UNZIP_SUPPORT
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char drive[_MAX_DRIVE + 1], dir[_MAX_DIR + 1], def[_MAX_FNAME + 1], ext[_MAX_EXT + 1];
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_splitpath(Memory.ROMFilename, drive, dir, def, ext);
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if (!strcasecmp(ext, ".msu1"))
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return true;
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unzFile unzFile = unzOpen(S9xGetFilename(".msu1", ROMFILENAME_DIR));
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if(!unzFile)
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unzFile = unzOpen(S9xGetFilename(".msu1", PATCH_DIR));
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if (unzFile)
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{
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unzClose(unzFile);
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return true;
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}
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#endif
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return false;
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}
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void S9xMSU1Generate(size_t sample_count)
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{
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partial_frames += 4410 * (sample_count / 2);
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while ((bufPos < (bufEnd - 2)) && partial_frames >= 3204)
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{
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if (MSU1.MSU1_STATUS & AudioPlaying && audioStream)
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{
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int32 sample;
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int16* left = (int16*)&sample;
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int16* right = left + 1;
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int bytes_read = READ_STREAM((char *)&sample, 4, audioStream);
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if (bytes_read == 4)
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{
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*left = ((int32)(int16)GET_LE16(left) * MSU1.MSU1_VOLUME / 255);
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*right = ((int32)(int16)GET_LE16(right) * MSU1.MSU1_VOLUME / 255);
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*(bufPos++) = *left;
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*(bufPos++) = *right;
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MSU1.MSU1_AUDIO_POS += 4;
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partial_frames -= 3204;
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}
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else
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if (bytes_read >= 0)
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{
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if (MSU1.MSU1_STATUS & AudioRepeating)
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{
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MSU1.MSU1_AUDIO_POS = audioLoopPos;
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REVERT_STREAM(audioStream, MSU1.MSU1_AUDIO_POS, 0);
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}
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else
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{
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MSU1.MSU1_STATUS &= ~(AudioPlaying | AudioRepeating);
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REVERT_STREAM(audioStream, 8, 0);
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}
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}
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else
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{
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MSU1.MSU1_STATUS &= ~(AudioPlaying | AudioRepeating);
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}
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}
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else
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{
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MSU1.MSU1_STATUS &= ~(AudioPlaying | AudioRepeating);
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partial_frames -= 3204;
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*(bufPos++) = 0;
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*(bufPos++) = 0;
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}
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}
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}
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uint8 S9xMSU1ReadPort(uint8 port)
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{
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switch (port)
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{
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case 0:
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return MSU1.MSU1_STATUS | MSU1_REVISION;
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case 1:
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{
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if (MSU1.MSU1_STATUS & DataBusy)
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return 0;
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if (!dataStream)
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return 0;
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int data = GETC_STREAM(dataStream);
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if (data >= 0)
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{
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MSU1.MSU1_DATA_POS++;
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return data;
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}
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return 0;
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}
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case 2:
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return 'S';
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case 3:
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return '-';
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case 4:
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return 'M';
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case 5:
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return 'S';
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case 6:
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return 'U';
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case 7:
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return '1';
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}
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return 0;
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}
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void S9xMSU1WritePort(uint8 port, uint8 byte)
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{
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switch (port)
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{
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case 0:
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MSU1.MSU1_DATA_SEEK &= 0xFFFFFF00;
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MSU1.MSU1_DATA_SEEK |= byte << 0;
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break;
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case 1:
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MSU1.MSU1_DATA_SEEK &= 0xFFFF00FF;
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MSU1.MSU1_DATA_SEEK |= byte << 8;
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break;
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case 2:
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MSU1.MSU1_DATA_SEEK &= 0xFF00FFFF;
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MSU1.MSU1_DATA_SEEK |= byte << 16;
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break;
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case 3:
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MSU1.MSU1_DATA_SEEK &= 0x00FFFFFF;
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MSU1.MSU1_DATA_SEEK |= byte << 24;
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MSU1.MSU1_DATA_POS = MSU1.MSU1_DATA_SEEK;
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if (dataStream)
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{
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REVERT_STREAM(dataStream, MSU1.MSU1_DATA_POS, 0);
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}
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break;
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case 4:
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MSU1.MSU1_TRACK_SEEK &= 0xFF00;
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MSU1.MSU1_TRACK_SEEK |= byte;
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break;
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case 5:
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MSU1.MSU1_TRACK_SEEK &= 0x00FF;
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MSU1.MSU1_TRACK_SEEK |= (byte << 8);
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MSU1.MSU1_CURRENT_TRACK = MSU1.MSU1_TRACK_SEEK;
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MSU1.MSU1_STATUS &= ~AudioPlaying;
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MSU1.MSU1_STATUS &= ~AudioRepeating;
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if (AudioOpen())
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{
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if (MSU1.MSU1_CURRENT_TRACK == MSU1.MSU1_RESUME_TRACK)
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{
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MSU1.MSU1_AUDIO_POS = MSU1.MSU1_RESUME_POS;
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MSU1.MSU1_RESUME_POS = 0;
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MSU1.MSU1_RESUME_TRACK = ~0;
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}
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else
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{
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MSU1.MSU1_AUDIO_POS = 8;
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}
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REVERT_STREAM(audioStream, MSU1.MSU1_AUDIO_POS, 0);
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}
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break;
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case 6:
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MSU1.MSU1_VOLUME = byte;
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break;
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case 7:
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if (MSU1.MSU1_STATUS & (AudioBusy | AudioError))
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break;
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MSU1.MSU1_STATUS = (MSU1.MSU1_STATUS & ~0x30) | ((byte & 0x03) << 4);
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if ((byte & (Play | Resume)) == Resume)
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{
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MSU1.MSU1_RESUME_TRACK = MSU1.MSU1_CURRENT_TRACK;
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MSU1.MSU1_RESUME_POS = MSU1.MSU1_AUDIO_POS;
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}
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break;
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}
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}
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size_t S9xMSU1Samples(void)
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{
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return bufPos - bufBegin;
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}
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void S9xMSU1SetOutput(int16 * out, size_t size)
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{
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bufPos = bufBegin = out;
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bufEnd = out + size;
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}
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void S9xMSU1PostLoadState(void)
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{
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if (DataOpen())
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{
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REVERT_STREAM(dataStream, MSU1.MSU1_DATA_POS, 0);
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}
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if (MSU1.MSU1_STATUS & AudioPlaying)
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{
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if (AudioOpen())
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{
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REVERT_STREAM(audioStream, 4, 0);
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READ_STREAM((char *)&audioLoopPos, 4, audioStream);
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audioLoopPos = GET_LE32(&audioLoopPos);
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audioLoopPos <<= 2;
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audioLoopPos += 8;
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REVERT_STREAM(audioStream, MSU1.MSU1_AUDIO_POS, 0);
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}
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else
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{
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MSU1.MSU1_STATUS &= ~(AudioPlaying | AudioRepeating);
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MSU1.MSU1_STATUS |= AudioError;
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}
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}
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bufPos = 0;
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bufBegin = 0;
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bufEnd = 0;
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partial_frames = 0;
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}
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