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audio: pipewire: Constify and clarify period size calculations

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Constify the min/max period variables, use a #define for the base clock rate used in the calculations and note that changing the upper limit can have dire side effects as it's a hard limit in Pipewire.
This commit is contained in:
Frank Praznik 2021-03-02 09:47:47 -05:00 committed by Sam Lantinga
parent d7ca855c2b
commit 9ed01da701
1 changed files with 10 additions and 7 deletions
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17
src/audio/pipewire/SDL_pipewire.c
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@ -34,9 +34,13 @@
/*
* These seem to be sane limits as Pipewire
* uses them in several of it's own modules.
*
* NOTE: 8192 is a hard upper limit in Pipewire and
* increasing this value can lead to buffer overflows.
*/
#define PW_MIN_SAMPLES 32 /* About 0.67ms at 48kHz */
#define PW_MAX_SAMPLES 8192 /* About 170.6ms at 48kHz */
#define PW_MIN_SAMPLES 32 /* About 0.67ms at 48kHz */
#define PW_MAX_SAMPLES 8192 /* About 170.6ms at 48kHz */
#define PW_BASE_CLOCK_RATE 48000
#define PW_POD_BUFFER_LENGTH 1024
#define PW_THREAD_NAME_BUFFER_LENGTH 128
@ -1009,10 +1013,13 @@ PIPEWIRE_OpenDevice(_THIS, void *handle, const char *devname, int iscapture)
struct pw_properties * props;
const char * stream_name, *stream_role;
const Uint32 node_id = this->handle == NULL ? PW_ID_ANY : PW_HANDLE_TO_ID(this->handle);
int min_period, adjusted_samples;
enum pw_stream_state state;
int res;
/* Clamp the period size to sane values */
const int min_period = PW_MIN_SAMPLES * SPA_MAX(this->spec.freq / PW_BASE_CLOCK_RATE, 1);
const int adjusted_samples = SPA_CLAMP(this->spec.samples, min_period, PW_MAX_SAMPLES);
/* Get the hints for the stream name and role */
stream_name = SDL_GetHint(SDL_HINT_AUDIO_DEVICE_STREAM_NAME);
if (!stream_name || *stream_name == '\0') {
@ -1035,10 +1042,6 @@ PIPEWIRE_OpenDevice(_THIS, void *handle, const char *devname, int iscapture)
return SDL_SetError("Pipewire: Failed to set audio format parameters");
}
/* Clamp the sample count to sane values */
min_period = PW_MIN_SAMPLES * SPA_MAX(this->spec.freq / 48000, 1);
adjusted_samples = SPA_CLAMP(this->spec.samples, min_period, PW_MAX_SAMPLES);
if ((this->hidden = priv = SDL_calloc(1, sizeof(struct SDL_PrivateAudioData))) == NULL) {
return SDL_OutOfMemory();
}