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dsp: Implemented audio capture support.

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This commit is contained in:
Ryan C. Gordon 2016-08-07 02:43:20 -04:00
parent a0ff2554c1
commit df4985e207
1 changed files with 38 additions and 11 deletions
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39
src/audio/dsp/SDL_dspaudio.c
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@ -107,9 +107,8 @@ DSP_OpenDevice(_THIS, void *handle, const char *devname, int iscapture)
if (this->hidden->audio_fd < 0) { if (this->hidden->audio_fd < 0) {
return SDL_SetError("Couldn't open %s: %s", devname, strerror(errno)); return SDL_SetError("Couldn't open %s: %s", devname, strerror(errno));
} }
this->hidden->mixbuf = NULL;
/* Make the file descriptor use blocking writes with fcntl() */ /* Make the file descriptor use blocking i/o with fcntl() */
{ {
long ctlflags; long ctlflags;
ctlflags = fcntl(this->hidden->audio_fd, F_GETFL); ctlflags = fcntl(this->hidden->audio_fd, F_GETFL);
@ -236,12 +235,14 @@ DSP_OpenDevice(_THIS, void *handle, const char *devname, int iscapture)
#endif #endif
/* Allocate mixing buffer */ /* Allocate mixing buffer */
if (!iscapture) {
this->hidden->mixlen = this->spec.size; this->hidden->mixlen = this->spec.size;
this->hidden->mixbuf = (Uint8 *) SDL_malloc(this->hidden->mixlen); this->hidden->mixbuf = (Uint8 *) SDL_malloc(this->hidden->mixlen);
if (this->hidden->mixbuf == NULL) { if (this->hidden->mixbuf == NULL) {
return SDL_OutOfMemory(); return SDL_OutOfMemory();
} }
SDL_memset(this->hidden->mixbuf, this->spec.silence, this->spec.size); SDL_memset(this->hidden->mixbuf, this->spec.silence, this->spec.size);
}
/* We're ready to rock and roll. :-) */ /* We're ready to rock and roll. :-) */
return 0; return 0;
@ -251,14 +252,13 @@ DSP_OpenDevice(_THIS, void *handle, const char *devname, int iscapture)
static void static void
DSP_PlayDevice(_THIS) DSP_PlayDevice(_THIS)
{ {
const Uint8 *mixbuf = this->hidden->mixbuf; struct SDL_PrivateAudioData *h = this->hidden;
const int mixlen = this->hidden->mixlen; if (write(h->audio_fd, h->mixbuf, h->mixlen) == -1) {
if (write(this->hidden->audio_fd, mixbuf, mixlen) == -1) {
perror("Audio write"); perror("Audio write");
SDL_OpenedAudioDeviceDisconnected(this); SDL_OpenedAudioDeviceDisconnected(this);
} }
#ifdef DEBUG_AUDIO #ifdef DEBUG_AUDIO
fprintf(stderr, "Wrote %d bytes of audio data\n", mixlen); fprintf(stderr, "Wrote %d bytes of audio data\n", h->mixlen);
#endif #endif
} }
@ -268,6 +268,30 @@ DSP_GetDeviceBuf(_THIS)
return (this->hidden->mixbuf); return (this->hidden->mixbuf);
} }
static int
DSP_CaptureFromDevice(_THIS, void *buffer, int buflen)
{
return (int) read(this->hidden->audio_fd, buffer, buflen);
}
static void
DSP_FlushCapture(_THIS)
{
struct SDL_PrivateAudioData *h = this->hidden;
audio_buf_info info;
if (ioctl(h->audio_fd, SNDCTL_DSP_GETISPACE, &info) == 0) {
while (info.bytes > 0) {
char buf[512];
const size_t len = SDL_min(sizeof (buf), info.bytes);
const ssize_t br = read(h->audio_fd, buf, len);
if (br <= 0) {
break;
}
info.bytes -= br;
}
}
}
static int static int
DSP_Init(SDL_AudioDriverImpl * impl) DSP_Init(SDL_AudioDriverImpl * impl)
{ {
@ -277,8 +301,11 @@ DSP_Init(SDL_AudioDriverImpl * impl)
impl->PlayDevice = DSP_PlayDevice; impl->PlayDevice = DSP_PlayDevice;
impl->GetDeviceBuf = DSP_GetDeviceBuf; impl->GetDeviceBuf = DSP_GetDeviceBuf;
impl->CloseDevice = DSP_CloseDevice; impl->CloseDevice = DSP_CloseDevice;
impl->CaptureFromDevice = DSP_CaptureFromDevice;
impl->FlushCapture = DSP_FlushCapture;
impl->AllowsArbitraryDeviceNames = 1; impl->AllowsArbitraryDeviceNames = 1;
impl->HasCaptureSupport = SDL_TRUE;
return 1; /* this audio target is available. */ return 1; /* this audio target is available. */
} }