ref: 3d9a179d3de101cf405df256918a7769d02698ee
parent: a1964a416460da1d6207671930034b9e942b12ed
author: Sigrid Solveig Haflínudóttir <sigrid@ftrv.se>
date: Wed Dec 27 22:13:37 EST 2023
openal: implement track playback via ffmpeg
--- a/unix/snd_openal.c
+++ b/unix/snd_openal.c
@@ -2,6 +2,8 @@
#include <AL/al.h>
#include <AL/alc.h>
#include <AL/alext.h>
+#include <sys/wait.h>
+#include <unistd.h>
typedef struct albuf_t albuf_t;
typedef struct alchan_t alchan_t;
@@ -28,9 +30,16 @@
cvar_t volume = {"volume", "0.7", true}; cvar_t bgmvolume = {"bgmvolume", "0.5", true};-static cvar_t s_al_dev = {"s_al_device", "-1", true};-static int s_al_dev_prev = -2;
+static struct {+ ALuint src, buf;
+ int pcm;
+ bool playing;
+ pid_t decoder, reader;
+}track;
+static cvar_t s_al_dev = {"s_al_device", "0", true};+static int s_al_dev_prev = -1;
+
static cvar_t s_al_hrtf = {"s_al_hrtf", "0", true}; static cvar_t s_al_doppler_factor = {"s_al_doppler_factor", "2", true}; static cvar_t s_al_resampler_default = {"s_al_resampler_default", "6", true}; // 23rd order Sinc@@ -38,7 +47,6 @@
static ALCcontext *ctx;
static ALCdevice *dev;
-static ALuint localsrc;
static Sfx *known_sfx;
static int num_sfx;
static int map;
@@ -54,6 +62,7 @@
static ALCchar *(*qalcGetStringiSOFT)(ALCdevice *, ALenum, ALsizei);
static ALCboolean (*qalcResetDeviceSOFT)(ALCdevice *, const ALCint *attr);
static ALCboolean *(*qalcReopenDeviceSOFT)(ALCdevice *, const ALCchar *devname, const ALCint *attr);
+static void (*qalBufferCallbackSOFT)(ALuint buf, ALenum fmt, ALsizei freq, ALBUFFERCALLBACKTYPESOFT cb, ALvoid *aux);
#define ALERR() alcheckerr(__FILE__, __LINE__)
@@ -142,6 +151,14 @@
static void
delchan(alchan_t *c)
{+ if(c->prev != nil)
+ c->prev->next = c->next;
+ if(c->next != nil)
+ c->next->prev = c->prev;
+ if(chans == c)
+ chans = c->next;
+ alSourceStop(c->src); ALERR();
+ alSourcei(c->src, AL_BUFFER, 0); ALERR();
alDeleteSources(1, &c->src); ALERR();
free(c);
}
@@ -313,7 +330,9 @@
stepsnd(vec3_t zp, vec3_t fw, vec3_t rt, vec3_t up)
{ vec_t fwup[6] = {fw[0], fw[1], fw[2], up[0], up[1], up[2]};+ alchan_t *c, *next;
static vec3_t ozp;
+ ALint state;
vec3_t vel;
if(dev == nil)
@@ -332,6 +351,13 @@
alListenerf(AL_GAIN, volume.value); ALERR();
ambs(zp);
+
+ for(c = chans; c != nil; c = next){+ next = c->next;
+ alGetSourcei(c->src, AL_SOURCE_STATE, &state);
+ if(!ALERR() && state != AL_PLAYING)
+ delchan(c);
+ }
}
void
@@ -474,11 +500,6 @@
alcDestroyContext(c); ALERR();
goto closedev;
}
- alGenSources(1, &localsrc);
- if(!ALERR()){- alSourcei(localsrc, AL_SOURCE_SPATIALIZE_SOFT, AL_FALSE);
- ALERR();
- }
alListenerf(AL_GAIN, volume.value); ALERR();
alDistanceModel(AL_LINEAR_DISTANCE_CLAMPED); ALERR();
@@ -494,7 +515,17 @@
if(ALERR())
al_num_resamplers = 0;
qalGetStringiSOFT = alGetProcAddress("alGetStringiSOFT");+ }else{+ qalGetStringiSOFT = nil;
}
+
+ qalBufferCallbackSOFT = nil;
+ if(alIsExtensionPresent("AL_SOFT_callback_buffer") && (alGenSources(1, &track.src), !ALERR())){+ alSourcei(track.src, AL_SOURCE_SPATIALIZE_SOFT, AL_FALSE); ALERR();
+ qalBufferCallbackSOFT = alGetProcAddress("alBufferCallbackSOFT");+ alGenBuffers(1, &track.buf); ALERR();
+ }
+
return 0;
}
@@ -640,12 +671,134 @@
void
stepcd(void)
{+ alSourcef(track.src, AL_GAIN, bgmvolume.value); ALERR();
}
+static ALsizei
+trackcb(ALvoid *aux, ALvoid *sampledata, ALsizei numbytes)
+{+ ssize_t n;
+ byte *b;
+
+ USED(aux);
+ for(b = sampledata; numbytes > 0; b += n, numbytes -= n){+ if((n = read(track.pcm, b, numbytes)) <= 0){+ close(track.pcm);
+ track.pcm = -1;
+ break;
+ }
+ }
+
+ return b - (byte*)sampledata;
+}
+
void
playcd(int nt, int loop)
{- USED(nt); USED(loop);
+ pid_t pid;
+ FILE *f;
+ fpos_t off;
+ int len, left, s[2], in[2];
+
+ shutcd();
+ if(qalBufferCallbackSOFT == nil)
+ return;
+
+ if((f = openlmp(va("music/track%02d.ogg", nt), &len)) == nil){+ if((f = openlmp(va("music/track%02d.mp3", nt), &len)) == nil)+ f = openlmp(va("music/track%02d.wav", nt), &len);+ }
+ if(f == nil)
+ return;
+ if(fgetpos(f, &off) != 0){+err:
+ close(track.pcm);
+ fclose(f);
+ if(track.decoder > 0)
+ waitpid(track.decoder, nil, 0);
+ if(track.reader > 0)
+ waitpid(track.reader, nil, 0);
+ return;
+ }
+
+ if(pipe(s) != 0)
+ goto err;
+ if(pipe(in) != 0){+ close(s[0]);
+ close(s[1]);
+ goto err;
+ }
+
+ switch((pid = fork())){+ case 0:
+ close(s[1]); dup2(s[0], 0);
+ close(in[0]); dup2(in[1], 1);
+ close(s[0]);
+ execl(
+ "/usr/bin/env", "/usr/bin/env",
+ "ffmpeg",
+ "-loglevel", "fatal",
+ "-i", "-",
+ "-acodec", "pcm_s16le",
+ "-f", "s16le",
+ "-ac", "2",
+ "-ar", "44100",
+ "-",
+ nil
+ );
+ perror("execl ffmpeg"); // FIXME(sigrid): add and use Con_Errorf?+ exit(1);
+ case -1:
+ goto err;
+ }
+ track.decoder = pid;
+
+ close(s[0]);
+ close(in[1]);
+ track.pcm = in[0];
+
+ switch((pid = fork())){+ case 0:
+ close(in[0]);
+ close(0);
+ close(1);
+ left = len;
+ for(;;){+ byte tmp[32768];
+ ssize_t n;
+ if((n = fread(tmp, 1, min(left, (int)sizeof(tmp)), f)) < 1){+ if(ferror(f)){+ perror("fread");+ break;
+ }
+ left -= n;
+ if(left < 1){+ if(!loop)
+ break;
+ if(fsetpos(f, &off) != 0){+ perror("fsetpos");+ break;
+ }
+ left = len;
+ }
+ }
+ if(write(s[1], tmp, n) != n)
+ break;
+ }
+ close(s[1]);
+ fclose(f);
+ exit(1);
+ case -1:
+ goto err;
+ }
+ track.reader = pid;
+
+ qalBufferCallbackSOFT(track.buf, AL_FORMAT_STEREO16, 44100, trackcb, nil);
+ if(ALERR())
+ goto err;
+ alSourcei(track.src, AL_BUFFER, track.buf); ALERR();
+ alSourcePlay(track.src); ALERR();
+ track.playing = true;
}
static void
@@ -656,11 +809,13 @@
void
resumecd(void)
{+ alSourcePlay(track.src); ALERR();
}
void
pausecd(void)
{+ alSourcePause(track.src); ALERR();
}
int
@@ -672,6 +827,17 @@
void
shutcd(void)
{+ if(track.playing){+ alSourceStop(track.src); ALERR();
+ alSourcei(track.src, AL_BUFFER, 0); ALERR();
+ if(track.pcm >= 0)
+ close(track.pcm);
+ waitpid(track.decoder, nil, 0);
+ waitpid(track.reader, nil, 0);
+ }
+ track.playing = false;
+ track.pcm = -1;
+ track.decoder = track.reader = -1;
}
int