geemili
/
SDL
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Improve audio compatibility in PSP. Now it supports more formats and frequencies

main
Francisco Javier Trujillo Mata 2021-11-17 23:50:41 +01:00 committed by Ryan C. Gordon
parent 16f5b9e3c3
commit f3255df9c0
1 changed files with 43 additions and 30 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

73
src/audio/psp/SDL_pspaudio.c
View File

@ -45,24 +45,42 @@ static int
PSPAUDIO_OpenDevice(_THIS, void *handle, const char *devname, int iscapture)
{
int format, mixlen, i;
this->hidden = (struct SDL_PrivateAudioData *)
SDL_malloc(sizeof(*this->hidden));
if (this->hidden == NULL) {
return SDL_OutOfMemory();
}
SDL_zerop(this->hidden);
switch (this->spec.format & 0xff) {
case 8:
case 16:
this->spec.format = AUDIO_S16LSB;
break;
default:
return SDL_SetError("Unsupported audio format");
}
/* device only natively supports S16LSB */
this->spec.format = AUDIO_S16LSB;
/* The sample count must be a multiple of 64. */
this->spec.samples = PSP_AUDIO_SAMPLE_ALIGN(this->spec.samples);
this->spec.freq = 44100;
/* Setup the hardware channel. */
if (this->spec.channels == 1) {
format = PSP_AUDIO_FORMAT_MONO;
} else {
format = PSP_AUDIO_FORMAT_STEREO;
}
/* PSP has some limitations with the Audio. It fully supports 44.1KHz (Mono & Stereo),
however with frequencies differents than 44.1KHz, it just supports Stereo,
so a resampler must be done for these scenarios */
if (this->spec.freq == 44100) {
this->hidden->channel = sceAudioChReserve(PSP_AUDIO_NEXT_CHANNEL, this->spec.samples, format);
} else {
this->hidden->channel = sceAudioSRCChReserve(this->spec.samples, this->spec.freq, 2);
this->spec.channels = 2; /* we're forcing the hardware to stereo. */
}
if (this->hidden->channel < 0) {
free(this->hidden->rawbuf);
this->hidden->rawbuf = NULL;
return SDL_SetError("Couldn't reserve hardware channel");
}
/* Update the fragment size as size in bytes. */
SDL_CalculateAudioSpec(&this->spec);
@ -76,20 +94,6 @@ PSPAUDIO_OpenDevice(_THIS, void *handle, const char *devname, int iscapture)
return SDL_SetError("Couldn't allocate mixing buffer");
}
/* Setup the hardware channel. */
if (this->spec.channels == 1) {
format = PSP_AUDIO_FORMAT_MONO;
} else {
this->spec.channels = 2;
format = PSP_AUDIO_FORMAT_STEREO;
}
this->hidden->channel = sceAudioChReserve(PSP_AUDIO_NEXT_CHANNEL, this->spec.samples, format);
if (this->hidden->channel < 0) {
free(this->hidden->rawbuf);
this->hidden->rawbuf = NULL;
return SDL_SetError("Couldn't reserve hardware channel");
}
SDL_memset(this->hidden->rawbuf, 0, mixlen);
for (i = 0; i < NUM_BUFFERS; i++) {
this->hidden->mixbufs[i] = &this->hidden->rawbuf[i * this->spec.size];
@ -101,11 +105,12 @@ PSPAUDIO_OpenDevice(_THIS, void *handle, const char *devname, int iscapture)
static void PSPAUDIO_PlayDevice(_THIS)
{
Uint8 *mixbuf = this->hidden->mixbufs[this->hidden->next_buffer];
if (this->spec.channels == 1) {
sceAudioOutputBlocking(this->hidden->channel, PSP_AUDIO_VOLUME_MAX, mixbuf);
if (this->spec.freq != 44100){
Uint8 *mixbuf = this->hidden->mixbufs[this->hidden->next_buffer];
SDL_assert(this->spec.channels == 2);
sceAudioSRCOutputBlocking(PSP_AUDIO_VOLUME_MAX, mixbuf);
} else {
Uint8 *mixbuf = this->hidden->mixbufs[this->hidden->next_buffer];
sceAudioOutputPannedBlocking(this->hidden->channel, PSP_AUDIO_VOLUME_MAX, PSP_AUDIO_VOLUME_MAX, mixbuf);
}
@ -126,10 +131,18 @@ static Uint8 *PSPAUDIO_GetDeviceBuf(_THIS)
static void PSPAUDIO_CloseDevice(_THIS)
{
if (this->hidden->channel >= 0) {
sceAudioChRelease(this->hidden->channel);
if (this->spec.freq != 44100){
sceAudioSRCChRelease();
} else {
sceAudioChRelease(this->hidden->channel);
}
this->hidden->channel = -1;
}
if (this->hidden->rawbuf != NULL) {
free(this->hidden->rawbuf);
this->hidden->rawbuf = NULL;
}
free(this->hidden->rawbuf); /* this uses memalign(), not SDL_malloc(). */
SDL_free(this->hidden);
}
static void PSPAUDIO_ThreadInit(_THIS)