/* Imaginer et creer par Abadie
joris*/
/* en utilisant un concept de Andre
pierre jocelyn*/
/*Cette oeuvre est protégée et n'est
divulguée que pour utilisation sous linux dans les conditions
Creative common ci-dessous*/
/* Cette oeuvre est mise à disposition
selon les termes de la Licence Creative Commons Paternité - Pas
d'Utilisation Commerciale - Partage des Conditions Initiales à
l'Identique 2.0 France. */
/*Aucune garantie n'est donner sur les
effets de cet executable*/
/* pour compiler : gcc l.c -lopenal -lsndfile -lm*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <math.h>
#define total 256
#define total1 256
#define efface "joris.wav"
#define cecci "abadie.jo"
/********fonction**openal**********/
#include <AL/al.h>
#include <AL/alc.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
/*********************/
int main(int argc, char *argv[])
{
FILE* debutwav = NULL;
debutwav = fopen(efface, "wb+");
if (debutwav != NULL)
{
unsigned char entete[44] =
{0x52,0x49,0x46,0x46,0x24,0xFC,0xFC,0x00,0x57,0x41,0x56,0x45,0x66,0x6D,0x74,0x20,0x10,0x00,0x00,0x00,0x01,0x00,0x01,0x00,0x44,0xAC,0x00,0x00,0x88,0x58,0x01,0x00,0x02,0x00,0x10,0x00,0x64,0x61,0x74,0x61,0x00,0xFC,0xFC,0x00};
fwrite(entete,1,sizeof(entete),debutwav);
fclose(debutwav), debutwav = NULL;;
}
/*j ouvre mon fichier de donner*/
/******ancien : format
ASCII*****************
FILE* oups = NULL;
char je;
int i;
oups = fopen(cecci, "r");
if (oups != NULL)
{
int bascule;
int nbdepoints, sens, amplitude;
int joris, ludion;
/****nouveau BIN****/
/*j ouvre mon fichier de donner*/
FILE* jojo = NULL;
int abadie = 0;
unsigned char tab1[total1] =
{0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F,0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F,0xA0,0xA1,0xA2,0xA3,0xA4,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF,0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF,0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF,0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF,0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF,0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x0A,0x0B,0x0C,0x0D,0x0E,0x0F,0x10,0x11,0x12,0x13,0x14,0x15,0x16,0x17,0x18,0x19,0x1A,0x1B,0x1C,0x1D,0x1E,0x1F,0x20,0x21,0x22,0x23,0x24,0x25,0x26,0x27,0x28,0x29,0x2A,0x2B,0x2C,0x2D,0x2E,0x2F,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39,0x3A,0x3B,0x3C,0x3D,0x3E,0x3F,0x40,0x41,0x42,0x43,0x44,0x45,0x46,0x47,0x48,0x49,0x4A,0x4B,0x4C,0x4D,0x4E,0x4F,0x50,0x51,0x52,0x53,0x54,0x55,0x56,0x57,0x58,0x59,0x5A,0x5B,0x5C,0x5D,0x5E,0x5F,0x60,0x61,0x62,0x63,0x64,0x65,0x66,0x67,0x68,0x69,0x6A,0x6B,0x6C,0x6D,0x6E,0x6F,0x70,0x71,0x72,0x73,0x74,0x75,0x76,0x77,0x78,0x79,0x7A,0x7B,0x7C,0x7D,0x7E,0x7F};
jojo = fopen(cecci, "rb");
if (jojo != NULL)
{
int assemble = 0;
int ludion = 0;
int enclanche = 0;
int nbdepoints, bascule;
int ouaitu;
double force2;
int amplitude;
int force1;
int groupe1;
int groupe2;
abadie = fgetc(jojo); /* abadie vient
chercher tout ce qui bouge*/
while (abadie != EOF)
{
for (ouaitu=0; ouaitu<255;
ouaitu++)
{
if ( abadie == tab1[ouaitu])
{
force1 = ouaitu;
assemble++;
}
}
/***debut assemble***/
switch (assemble) {
case 1 :
groupe1 = force1;
/*assemble = 2;*/
break;
case 2 :
groupe2 = force1;
/*assemble = 3;*/
force2 = (double)(groupe1 + 256 *
groupe2);
amplitude = (int)(force2);
break;
default:
nbdepoints = force1;
/****fin traitement bin******/
/***conversion nouvelle donner en
ancienne****/
double jo;
jo = (double)(nbdepoints * 0.63);
if (jo < 2){ jo = 1; }
int sens;
if (ludion > amplitude) { sens = 2;
}
else { sens = 1; }
/***fin conversion***/
double codebash;
char va;
FILE* script = NULL;
char tab[total] =
{0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F,0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F,0xA0,0xA1,0xA2,0xA3,0xA4,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF,0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF,0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF,0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF,0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF,0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x0A,0x0B,0x0C,0x0D,0x0E,0x0F,0x10,0x11,0x12,0x13,0x14,0x15,0x16,0x17,0x18,0x19,0x1A,0x1B,0x1C,0x1D,0x1E,0x1F,0x20,0x21,0x22,0x23,0x24,0x25,0x26,0x27,0x28,0x29,0x2A,0x2B,0x2C,0x2D,0x2E,0x2F,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39,0x3A,0x3B,0x3C,0x3D,0x3E,0x3F,0x40,0x41,0x42,0x43,0x44,0x45,0x46,0x47,0x48,0x49,0x4A,0x4B,0x4C,0x4D,0x4E,0x4F,0x50,0x51,0x52,0x53,0x54,0x55,0x56,0x57,0x58,0x59,0x5A,0x5B,0x5C,0x5D,0x5E,0x5F,0x60,0x61,0x62,0x63,0x64,0x65,0x66,0x67,0x68,0x69,0x6A,0x6B,0x6C,0x6D,0x6E,0x6F,0x70,0x71,0x72,0x73,0x74,0x75,0x76,0x77,0x78,0x79,0x7A,0x7B,0x7C,0x7D,0x7E,0x7F};
char *ptr;
char *petr;
script = fopen(efface, "ab");
/* pour ajouter a. possible w ou r+ w+ tester */
if (script != NULL)
{
/*******/
if(sens == 2)
/*ajouter dessous*/
{
if ( nbdepoints < 2)
{
codebash = (int)(amplitude);
int ji;
int ij;
int ola;
ola = (int)codebash;
/*ji = ola%256;*/
ij = (int)(ola*0.00390625);
ji = ola - (256*ij);
ptr = &tab[ji];
petr = &tab[ij];
fwrite( ptr, sizeof(char), 1, script);
fwrite( petr, sizeof(char), 1,
script);
}
else if (( nbdepoints & 1)&&(
nbdepoints >= 2))
{
double ote, ote1;
int boucle;
boucle = nbdepoints * 0.5;
ote = ( ludion - amplitude) * 0.5;
while ( boucle > 0)
{
ote1 = ote * ( 1 - exp (-boucle/jo));
/*
fprintf(script,"%d ",
(int)codebash );
*/
codebash = (int)( amplitude + ote +
ote1);
int ji;
int ij;
int ola;
ola = (int)codebash;
/*ji = ola%256;*/
ij = (int)(ola*0.00390625);
ji = ola - (256*ij);
ptr = &tab[ji];
petr = &tab[ij];
fwrite( ptr, sizeof(char), 1, script);
fwrite( petr, sizeof(char), 1,
script);
/****************************/
boucle--;
bascule = codebash;
}
enclanche = 2;/*****************premier
enclanche du sens 2************/
if ( enclanche == 2)
{
double ote, ote1;
ote = (ludion - amplitude ) * 0.5;
int boucle1 = 1;
while (boucle1 < nbdepoints * 0.5 +
2)
{
ote1 = ote * ( 1 - exp (-boucle1/jo));
codebash = (int) ( ludion - ote
-ote1);
int ji;
int ij;
int ola;
ola = (int)codebash;
/*ji = ola%256;*/
ij = (int)(ola*0.00390625);
ji = ola - (256*ij);
ptr = &tab[ji];
petr = &tab[ij];
fwrite( ptr, sizeof(char), 1, script);
fwrite( petr, sizeof(char), 1,
script);
/*fin modif*/
boucle1++;
}
enclanche = 0;
}
}
/**************************/
else
{
double ote, ote1;
int boucle;
boucle = nbdepoints * 0.5;
ote = (ludion - amplitude) * 0.5;
while ( boucle > 0)
{
ote1 = ote * ( 1 - exp (-boucle/jo));
/*
fprintf(script,"%d ",
(int)codebash );
*/
codebash = (int)( amplitude + ote +
ote1);
int ji;
int ij;
int ola;
ola = (int)codebash;
/*ji = ola%256;*/
ij = (int)(ola*0.00390625);
ji = ola - (256*ij);
ptr = &tab[ji];
petr = &tab[ij];
fwrite( ptr, sizeof(char), 1, script);
fwrite( petr, sizeof(char), 1,
script);
/*fin modif*/
boucle--;
bascule = codebash;
}
enclanche = 2; /*** deuxieme enclanche
du sens 2**********/
if ( enclanche == 2)
{
double ote, ote1;
ote = (ludion - amplitude) * 0.5;
int boucle1 = 1;
while (boucle1 < nbdepoints * 0.5 +
1)
{
ote1 = ote * ( 1 - exp (-boucle1/jo));
codebash = (int) ( ludion - ote
-ote1);
int ji;
int ij;
int ola;
ola = (int)codebash;
/*ji = ola%256;*/
ij = (int)(ola*0.00390625);
ji = ola - (256*ij);
ptr = &tab[ji];
petr = &tab[ij];
fwrite( ptr, sizeof(char), 1, script);
fwrite( petr, sizeof(char), 1,
script);
/*fin modif*/
boucle1++;
}
enclanche = 0;
/* fin descente 2*/
}
}
}
/*en attente*/
/**********/
if(sens == 1)
{
if ( nbdepoints < 2)
{
codebash = (int)(amplitude);
int ji;
int ij;
int ola;
ola = (int)codebash;
/*ji = ola%256;*/
ij = (int)(ola*0.00390625);
ji = ola - (256*ij);
ptr = &tab[ji];
petr = &tab[ij];
fwrite( ptr, sizeof(char), 1, script);
fwrite( petr, sizeof(char), 1,
script);
}
/************************correction
impair*************************************************************************/
else if (( nbdepoints & 1)&&(
nbdepoints >= 2))
{
double ote, ote1;
int boucle;
boucle = nbdepoints * 0.5;
if ( boucle == 0)
{
boucle = 1;
}
ote = ( amplitude - ludion ) * 0.5;
while ( boucle > 0)
{
ote1 = ote * ( 1 - exp (-boucle/jo));
codebash = amplitude - ote - ote1;
/*
fprintf(script,"%d ",
(int)codebash );
*/
codebash = (int)(amplitude - ote -
ote1);
int ji;
int ij;
int ola;
ola = (int)codebash;
/*ji = ola%256;*/
ij = (int)(ola*0.00390625);
ji = ola - (256*ij);
ptr = &tab[ji];
petr = &tab[ij];
fwrite( ptr, sizeof(char), 1, script);
fwrite( petr, sizeof(char), 1,
script);
bascule = codebash;
/*fin modif*/
boucle--;
}
enclanche = 1;
/* debut descente inverse du sens 1 */
if (enclanche == 1)
{
double ote, ote1;
int boucle, boncompte;
boucle = 1;
ote = ( amplitude - ludion ) * 0.5;
boncompte = nbdepoints * 0.5;
if (boncompte == 0)
{
boncompte = 1;
}
while (boucle < (boncompte+2))
{
ote1 = ote * ( 1 - exp (-boucle/jo));
codebash = (int) (ludion + ote +
ote1);
int ji;
int ij;
int ola;
ola = (int)codebash;
/*ji = ola%256;*/
ij = (int)(ola*0.00390625);
ji = ola - (256*ij);
ptr = &tab[ji];
petr = &tab[ij];
fwrite( ptr, sizeof(char), 1, script);
fwrite( petr, sizeof(char), 1,
script);
/*fin modif*/
boucle++;
}
enclanche = 0;
}
}
/***********************************fin
correction
impair**************************************************************/
else
{
double ote, ote1;
int boucle;
boucle = nbdepoints * 0.5;
if ( boucle == 0)
{
boucle = 1;
}
ote = ( amplitude - ludion ) * 0.5;
while ( boucle > 0)
{
ote1 = ote * ( 1 - exp (-boucle/jo));
codebash = amplitude - ote - ote1;
/*
fprintf(script,"%d ",
(int)codebash );
*/
codebash = (int)(amplitude - ote -
ote1);
int ji;
int ij;
int ola;
ola = (int)codebash;
/*ji = ola%256;*/
ij = (int)(ola*0.00390625);
ji = ola - (256*ij);
ptr = &tab[ji];
petr = &tab[ij];
fwrite( ptr, sizeof(char), 1, script);
fwrite( petr, sizeof(char), 1,
script);
bascule = codebash;
/*fin modif*/
boucle--;
}
enclanche = 1;
/* debut descente inverse du sens 1 */
if (enclanche == 1)
{
double ote, ote1;
int boucle, boncompte;
boucle = 1;
ote = ( amplitude - ludion ) * 0.5;
boncompte = nbdepoints * 0.5;
if (boncompte == 0)
{
boncompte = 1;
}
while (boucle < (boncompte+1))
{
ote1 = ote * ( 1 - exp (-boucle/jo));
codebash = (int) (ludion + ote +
ote1);
int ji;
int ij;
int ola;
ola = (int)codebash;
/*ji = ola%256;*/
ij = (int)(ola*0.00390625);
ji = ola - (256*ij);
ptr = &tab[ji];
petr = &tab[ij];
fwrite( ptr, sizeof(char), 1, script);
fwrite( petr, sizeof(char), 1,
script);
/*fin modif*/
boucle++;
}
enclanche = 0;
}
}
}
/* fin*/
/********/
/*****/
fclose(script), script = NULL;;
}
ludion = amplitude;
/*pas*toucher*/
assemble = 0;
} /***fin assemble***/
abadie = fgetc(jojo); /* abadie va
chercher la suivante*/
}
fclose(jojo), jojo = NULL;;
}
/****************debut openal****/
int josi(int argc, char **argv);
{
ALCdevice *dev;
ALCcontext *ctx;
struct stat statbuf;
if(argc < 2)
{
fprintf(stderr, "Usage: %s
<audiofile>\n", argv[0]);
return 0;
}
/* First the standard open-device,
create-context, set-context.. */
dev = alcOpenDevice(NULL);
if(!dev)
{
fprintf(stderr, "Oops\n");
return 1;
}
ctx = alcCreateContext(dev, NULL);
alcMakeContextCurrent(ctx);
if(!ctx)
{
fprintf(stderr, "Oops2\n");
return 1;
}
{
/* The number of buffers and
bytes-per-buffer for our stream are set
* here. The number of buffers should be
two or more, and the buffer
* size should be a multiple of the
frame size (by default, OpenAL's
* largest frame size is 4, however
extensions that can add more formats
* may be larger). Slower systems may
need more buffers/larger buffer
* sizes. */
#define NUM_BUFFERS 3
#define BUFFER_SIZE 4096
/* These are what we'll use for OpenAL
playback */
ALuint source, buffers[NUM_BUFFERS];
ALuint frequency;
ALenum format;
unsigned char *buf;
/* These are used for interacting with
mplayer */
int pid, files[2];
FILE *f;
/* Generate the buffers and sources */
alGenBuffers(NUM_BUFFERS, buffers);
alGenSources(1, &source);
if(alGetError() != AL_NO_ERROR)
{
fprintf(stderr, "Error generating
:(\n");
return 1;
}
/* Here's where our magic begins.
First, we want to call stat on the
* filename since mplayer will just
silently exit if it tries to play a
* non-existant file **/
if(stat(argv[1], &statbuf) != 0 ||
!S_ISREG(statbuf.st_mode))
{
fprintf(stderr, "%s doesn't seem
to be a regular file :(\n", argv[1]);
return 1;
}
/* Open a file pipe. This will create
two file-descriptors, one for
* reading and another for writing. The
data will be passed in memory,
* so it won't be bogged by disk access.
*/
if(pipe(files) != 0)
{
fprintf(stderr, "Pipe failed
:(\n");
return 1;
}
/* Now we fork. The forked process will
inherit the original process's
* file descriptors, so each process
will have access to the same pipe.
* Note that the process memory isn't
shared (if you change something in
* one process, the other will be
unaffected). */
pid = fork();
switch(pid)
{
case -1:
/* If it returns -1, there was an error
*/
fprintf(stderr, "Fork failed
:(\n");
return 1;
break;
case 0:
/* Returning 0 means that we're now in
the child process, that
* we'll turn into mplayer. First, we
can close the read file
* descriptor since this process won't
be reading from it. */
close(files[0]);
/* Here's part of the trick. After
closing the stdout file
* descriptor, dup2 assigns it the
pipe's write file descriptor.
* So now, whenever anything writes to
stdout, it'll go to the
* pipe instead! */
close(STDOUT_FILENO);
dup2(files[1], STDOUT_FILENO);
/* We can use execlp to run mplayer
with the options we need. To
* output audio as a standard
.wav-formatted file, we use the
* pcm audio-out device, and tell it to
write to stdout. By
* running this, we overwrite the
current process memory with
* the named commmand, which causes it
to start mplayer with the
* overridden stdout */
execlp("mplayer", "-nogui",
"-really-quiet", "-novideo",
"-noconsolecontrols", "-ao",
"pcm:file=/dev/stdout",
argv[1], (char*)NULL);
/* The exec* functions should never
return. If it does,
* something went wrong, so just _exit.
*/
_exit(1);
default:
/* Any other return value means we're
in the parent process.
* Here, we don't need the write file
descriptor, so close it.
* Now we can begin using the read file
descriptor to read
* mplayer's stdout, which will be the
file decoded in real-
* time! */
close(files[1]);
break;
}
/* fdopen simply creates a FILE* from
the given file descriptor. This is
* generally easier to work with, but
there's no reason you couldn't use
* the lower-level io routines on the
descriptor if you wanted */
f = fdopen(files[0], "rb");
/* Allocate the buffer, and read the
RIFF-WAVE header. We don't actually
* need to read it, so just ignore what
it writes to the buffer. Because
* this is a file pipe, it is
unseekable, so we have to read bytes we
* want to skip. Also note that because
mplayer is writing out the file
* in real-time, the chunk size
information may not be filled out. */
buf = malloc(BUFFER_SIZE);
fread(buf, 1, 12, f);
/* This is the first .wav file chunk.
Check the chunk header to make
* sure it is the format information.
The first four bytes is the
* indentifier (which we check), and the
last four is the chunk size
* (which we ignore) */
fread(buf, 1, 8, f);
if(buf[0] != 'f' || buf[1] != 'm' ||
buf[2] != 't' || buf[3] != ' ')
{
/* If this isn't the format info, it
probably means it was an
* unsupported audio format for mplayer,
or the file didn't contain
* an audio track. */
fprintf(stderr, "Not 'fmt '
:(\n");
/* Note that closing the file will
leave mplayer's write file
* descriptor without a read
counterpart. This will cause mplayer to
* receive a SIGPIPE signal, which will
cause it to abort and exit
* automatically for us. Alternatively,
you can use the pid returned
* from fork() to send it a signal
explicitly. */
fclose(f);
return 1;
}
{
int channels, bits;
/* Read the wave format type, as a
16-bit little-endian integer.
* There's no reason this shouldn't be
1. */
fread(buf, 1, 2, f);
if(buf[1] != 0 || buf[0] != 1)
{
fprintf(stderr, "Not PCM :(\n");
fclose(f);
return 1;
}
/* Get the channel count (16-bit
little-endian) */
fread(buf, 1, 2, f);
channels = buf[1]<<8;
channels |= buf[0];
/* Get the sample frequency (32-bit
little-endian) */
fread(buf, 1, 4, f);
frequency = buf[3]<<24;
frequency |= buf[2]<<16;
frequency |= buf[1]<<8;
frequency |= buf[0];
/* The next 6 bytes hold the block size
and bytes-per-second. We
* don't need that info, so just read
and ignore it. */
fread(buf, 1, 6, f);
/* Get the bit depth (16-bit
little-endian) */
fread(buf, 1, 2, f);
bits = buf[1]<<8;
bits |= buf[0];
/* Now convert the given channel count
and bit depth into an OpenAL
* format. We could use extensions to
support more formats (eg.
* surround sound, floating-point
samples), but that is beyond the
* scope of this tutorial */
format = 0;
if(bits == 8)
{
if(channels == 1)
format = AL_FORMAT_MONO8;
else if(channels == 2)
format = AL_FORMAT_STEREO8;
}
else if(bits == 16)
{
if(channels == 1)
format = AL_FORMAT_MONO16;
else if(channels == 2)
format = AL_FORMAT_STEREO16;
}
if(!format)
{
fprintf(stderr, "Incompatible
format (%d, %d) :(\n", channels, bits);
fclose(f);
return 1;
}
}
/* Next up is the data chunk, which
will hold the decoded sample data */
fread(buf, 1, 8, f);
if(buf[0] != 'd' || buf[1] != 'a' ||
buf[2] != 't' || buf[3] != 'a')
{
fclose(f);
fprintf(stderr, "Not 'data'
:(\n");
return 1;
}
/* Now we have everything we need. To
read the decoded data, all we have
* to do is read from the file handle!
Note that the .wav format spec
* has multibyte sample foramts stored
as little-endian. If you were on
* a big-endian machine, you'd have to
iterate over the returned data
* and flip the bytes for those formats
before giving it to OpenAL. Also
* be aware that there is no seeking on
the file handle. A slightly more
* complex setup could be made to send
commands back to mplayer to seek
* on the stream, however that is beyond
the scope of this tutorial. */
{
int ret;
/* Fill the data buffer with the amount
of bytes-per-buffer, and
* buffer it into OpenAL. This may read
(and return) less than the
* requested amount when it hits the end
of the "stream" */
ret = fread(buf, 1, BUFFER_SIZE, f);
alBufferData(buffers[0], format, buf,
ret, frequency);
/* Once the data's buffered into
OpenAL, we're free to modify our
* data buffer, so reuse it to fill the
remaining OpenAL buffers. */
ret = fread(buf, 1, BUFFER_SIZE, f);
alBufferData(buffers[1], format, buf,
ret, frequency);
ret = fread(buf, 1, BUFFER_SIZE, f);
alBufferData(buffers[2], format, buf,
ret, frequency);
if(alGetError() != AL_NO_ERROR)
{
fprintf(stderr, "Error loading
:(\n");
return 1;
}
/* Queue the buffers onto the source,
and start playback! */
alSourceQueueBuffers(source,
NUM_BUFFERS, buffers);
alSourcePlay(source);
if(alGetError() != AL_NO_ERROR)
{
fprintf(stderr, "Error starting
:(\n");
return 1;
}
/* While not at the end of the
stream... */
while(!feof(f))
{
ALuint buffer;
ALint val;
/* Check if OpenAL is done with any of
the queued buffers */
alGetSourcei(source,
AL_BUFFERS_PROCESSED, &val);
if(val <= 0)
continue;
/* For each processed buffer... */
while(val--)
{
/* Read the next chunk of decoded data
from the stream */
ret = fread(buf, 1, BUFFER_SIZE, f);
/* Pop the oldest queued buffer from
the source, fill it
* with the new data, then requeue it
*/
alSourceUnqueueBuffers(source, 1,
&buffer);
alBufferData(buffer, format, buf, ret,
frequency);
alSourceQueueBuffers(source, 1,
&buffer);
if(alGetError() != AL_NO_ERROR)
{
fprintf(stderr, "Error buffering
:(\n");
return 1;
}
}
/* Make sure the source is still
playing, and restart it if
* needed. */
alGetSourcei(source, AL_SOURCE_STATE,
&val);
if(val != AL_PLAYING)
alSourcePlay(source);
}
}
/* File's done decoding. We can close
the pipe and free the data buffer
* now. */
fclose(f);
free(buf);
{
ALint val;
/* Although mplayer is done giving us
data, OpenAL may still be
* playing the remaining buffers. Wait
until it stops. */
do {
alGetSourcei(source, AL_SOURCE_STATE,
&val);
} while(val == AL_PLAYING);
}
/* Done playing. Delete the source and
buffers */
alDeleteSources(1, &source);
alDeleteBuffers(NUM_BUFFERS, buffers);
}
/* All done. Close OpenAL and exit. */
alcMakeContextCurrent(NULL);
alcDestroyContext(ctx);
alcCloseDevice(dev);
}
remove(efface);
/******fin openal*************/
return 0;
}