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/*
Fake86: A portable, open-source 8086 PC emulator.
Copyright (C)2010-2013 Mike Chambers
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.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
/* audio.c: functions to mix the audio channels, and handle SDL's audio interface. */
#include "config.h"
#include <SDL/SDL.h>
#ifdef _WIN32
#include <Windows.h>
#include <process.h>
#else
#include <pthread.h>
#endif
#include <stdint.h>
#include <stdio.h>
#include <memory.h>
#include "blaster.h"
#include "audio.h"
extern SDL_Surface *screen;
struct wav_hdr_s wav_hdr;
FILE *wav_file = NULL;
SDL_AudioSpec wanted;
int8_t audbuf[96000];
int32_t audbufptr, usebuffersize, usesamplerate = AUDIO_DEFAULT_SAMPLE_RATE, latency = AUDIO_DEFAULT_LATENCY;
uint8_t speakerenabled = 0;
extern uint64_t gensamplerate, sampleticks, hostfreq;
extern int16_t adlibgensample();
extern int16_t speakergensample();
extern int16_t getssourcebyte();
extern int16_t getBlasterSample();
extern uint8_t usessource;
void create_output_wav (uint8_t *filename) {
printf ("Creating %s for audio logging... ", filename);
wav_file = fopen (filename, "wb");
if (wav_file == NULL) {
printf ("failed!\n");
return;
}
printf ("OK!\n");
wav_hdr.AudioFormat = 1; //PCM
wav_hdr.bitsPerSample = 8;
wav_hdr.blockAlign = 1;
wav_hdr.ChunkSize = sizeof (wav_hdr) - 4;
sprintf (&wav_hdr.WAVE[0], "WAVE");
sprintf (&wav_hdr.fmt[0], "fmt ");
wav_hdr.NumOfChan = 1;
wav_hdr.bytesPerSec = usesamplerate * (uint32_t) (wav_hdr.bitsPerSample >> 3) * (uint32_t) wav_hdr.NumOfChan;
sprintf (&wav_hdr.RIFF[0], "RIFF");
wav_hdr.Subchunk1Size = 16;
wav_hdr.SamplesPerSec = usesamplerate;
sprintf (&wav_hdr.Subchunk2ID[0], "data");
wav_hdr.Subchunk2Size = 0;
//fwrite((void *)&wav_hdr, 1, sizeof(wav_hdr), wav_file);
}
uint64_t doublesamplecount, cursampnum = 0, sampcount = 0, framecount = 0;
uint8_t bmpfilename[256];
void savepic() {
SDL_SaveBMP (screen, &bmpfilename[0]);
}
int8_t samps[2400];
uint8_t audiobufferfilled() {
if (audbufptr >= usebuffersize) return(1);
return(0);
}
void tickaudio() {
int16_t sample;
if (audbufptr >= usebuffersize) return;
sample = adlibgensample() >> 4;
if (usessource) sample += getssourcebyte();
sample += getBlasterSample();
if (speakerenabled) sample += (speakergensample() >> 1);
if (audbufptr < sizeof(audbuf) ) audbuf[audbufptr++] = (uint8_t) ((uint16_t) sample+128);
}
extern uint64_t timinginterval;
extern void inittiming();
void fill_audio (void *udata, int8_t *stream, int len) {
memcpy (stream, audbuf, len);
memmove (audbuf, &audbuf[len], usebuffersize - len);
audbufptr -= len;
if (audbufptr < 0) audbufptr = 0;
}
void initaudio() {
printf ("Initializing audio stream... ");
if (usesamplerate < 4000) usesamplerate = 4000;
else if (usesamplerate > 96000) usesamplerate = 96000;
if (latency < 10) latency = 10;
else if (latency > 1000) latency = 1000;
audbufptr = usebuffersize = (usesamplerate / 1000) * latency;
gensamplerate = usesamplerate;
doublesamplecount = (uint32_t) ( (double) usesamplerate * (double) 0.01);
wanted.freq = usesamplerate;
wanted.format = AUDIO_U8;
wanted.channels = 1;
wanted.samples = (uint16_t) usebuffersize >> 1;
wanted.callback = (void *) fill_audio;
wanted.userdata = NULL;
if (SDL_OpenAudio (&wanted, NULL) <0) {
printf ("Error: %s\n", SDL_GetError() );
return;
}
else {
printf ("OK! (%lu Hz, %lu ms, %lu sample latency)\n", usesamplerate, latency, usebuffersize);
}
memset (audbuf, 128, sizeof (audbuf) );
audbufptr = usebuffersize;
//create_output_wav("fake86.wav");
SDL_PauseAudio (0);
return;
}
void killaudio() {
SDL_PauseAudio (1);
if (wav_file == NULL) return;
wav_hdr.ChunkSize = wav_hdr.Subchunk2Size + sizeof(wav_hdr) - 8;
fseek(wav_file, 0, SEEK_SET);
fwrite((void *)&wav_hdr, 1, sizeof(wav_hdr), wav_file);
fclose (wav_file);
}
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