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pulseaudio: Add "zerocopy" playback path

This commit is contained in:
Oschowa 2021-02-20 09:28:03 +01:00 committed by Ryan C. Gordon
parent a29fe29296
commit 08547adb52
2 changed files with 26 additions and 2 deletions
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22
src/audio/pulseaudio/SDL_pulseaudio.c
View File

@ -103,6 +103,8 @@ static int (*PULSEAUDIO_pa_stream_connect_record) (pa_stream *, const char *,
static pa_stream_state_t (*PULSEAUDIO_pa_stream_get_state) (pa_stream *);
static size_t (*PULSEAUDIO_pa_stream_writable_size) (pa_stream *);
static size_t (*PULSEAUDIO_pa_stream_readable_size) (pa_stream *);
static int (*PULSEAUDIO_pa_stream_begin_write) (pa_stream *, void **, size_t*);
static int (*PULSEAUDIO_pa_stream_cancel_write) (pa_stream *);
static int (*PULSEAUDIO_pa_stream_write) (pa_stream *, const void *, size_t,
pa_free_cb_t, int64_t, pa_seek_mode_t);
static pa_operation * (*PULSEAUDIO_pa_stream_drain) (pa_stream *,
@ -216,6 +218,8 @@ load_pulseaudio_syms(void)
SDL_PULSEAUDIO_SYM(pa_stream_writable_size);
SDL_PULSEAUDIO_SYM(pa_stream_readable_size);
SDL_PULSEAUDIO_SYM(pa_stream_write);
SDL_PULSEAUDIO_SYM(pa_stream_begin_write);
SDL_PULSEAUDIO_SYM(pa_stream_cancel_write);
SDL_PULSEAUDIO_SYM(pa_stream_drain);
SDL_PULSEAUDIO_SYM(pa_stream_disconnect);
SDL_PULSEAUDIO_SYM(pa_stream_peek);
@ -366,7 +370,7 @@ PULSEAUDIO_PlayDevice(_THIS)
/* Write the audio data */
struct SDL_PrivateAudioData *h = this->hidden;
if (SDL_AtomicGet(&this->enabled)) {
if (PULSEAUDIO_pa_stream_write(h->stream, h->mixbuf, h->mixlen, NULL, 0LL, PA_SEEK_RELATIVE) < 0) {
if (PULSEAUDIO_pa_stream_write(h->stream, h->pabuf, h->mixlen, NULL, 0LL, PA_SEEK_RELATIVE) < 0) {
SDL_OpenedAudioDeviceDisconnected(this);
}
}
@ -375,7 +379,21 @@ PULSEAUDIO_PlayDevice(_THIS)
static Uint8 *
PULSEAUDIO_GetDeviceBuf(_THIS)
{
return (this->hidden->mixbuf);
struct SDL_PrivateAudioData *h = this->hidden;
size_t nbytes = h->mixlen;
int ret;
ret = PULSEAUDIO_pa_stream_begin_write(h->stream, &h->pabuf, &nbytes);
if (ret != 0) {
/* fall back it intermediate buffer */
h->pabuf = h->mixbuf;
} else if (nbytes < h->mixlen) {
PULSEAUDIO_pa_stream_cancel_write(h->stream);
h->pabuf = h->mixbuf;
}
return (Uint8 *)h->pabuf;
}

6
src/audio/pulseaudio/SDL_pulseaudio.h
View File

@ -43,6 +43,12 @@ struct SDL_PrivateAudioData
Uint8 *mixbuf;
int mixlen;
/* Pointer to the actual buffer in use in the current
GetDeviceBuf() -> PlayDevice() iteration.
Can be either the pointer returned by pa_stream_begin_write()
or mixbuf */
void *pabuf;
const Uint8 *capturebuf;
int capturelen;
};