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Remove callback from cosmoaudio API

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Using callbacks is still problematic with cosmo_dlopen() due to the need
to restore the TLS register. So using callbacks is even more strict than
using signal handlers. We are better off introducing a cosmoaudio_poll()
function. It makes the API more UNIX-like. How bad could the latency be?
This commit is contained in:
Justine Tunney 2024-09-07 17:42:15 -07:00
parent d99f066114
commit d50d954a3c
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GPG key ID: BE714B4575D6E328
17 changed files with 433 additions and 158 deletions
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37
dsp/audio/cosmoaudio/cosmoaudio.h
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@ -21,6 +21,7 @@
#define COSMOAUDIO_ERROR -1 // unspecified error
#define COSMOAUDIO_EINVAL -2 // invalid parameters passed to api
#define COSMOAUDIO_ELINK -3 // loading cosmoaudio dso failed
#define COSMOAUDIO_ENOBUF -4 // invalid buffering parameters
#ifdef __cplusplus
extern "C" {
@ -28,14 +29,6 @@ extern "C" {
struct CosmoAudio;
typedef void cosmoaudio_data_callback_f( //
struct CosmoAudio *ca, //
float *outputSamples, //
const float *inputSamples, //
int frameCount, //
int channels, //
void *argument);
enum CosmoAudioDeviceType {
kCosmoAudioDeviceTypePlayback = 1,
kCosmoAudioDeviceTypeCapture = 2,
@ -62,20 +55,10 @@ struct CosmoAudioOpenOptions {
// for mono or 2 for stereo.
int channels;
// Number of periods in ring buffer. Set to 0 for default. Higher
// numbers (e.g. 20) means more buffering. Lower numbers (e.g. 2)
// means less buffering. This is ignored if callback is specified.
int periods;
// If callback is NULL, then cosmoaudio_write() and cosmoaudio_read()
// should be used, which ring buffer audio to the default internal
// routine. Setting this callback to non-NULL puts CosmoAudio in
// manual mode, where the callback is responsible for copying PCM
// samples each time the device calls this.
cosmoaudio_data_callback_f *dataCallback;
// This is an arbitrary value passed to the callback.
void *argument;
// Number of frames in each ring buffer. A frame consists of a PCM
// sample for each channel. Set to 0 for default. If this is less than
// the device period size times two, it'll be increased to that value.
int bufferFrames;
};
COSMOAUDIO_API int cosmoaudio_version(void) COSMOAUDIO_ABI;
@ -95,12 +78,22 @@ COSMOAUDIO_API int cosmoaudio_write( //
int frameCount //
) COSMOAUDIO_ABI;
COSMOAUDIO_API int cosmoaudio_flush( //
struct CosmoAudio *ca //
) COSMOAUDIO_ABI;
COSMOAUDIO_API int cosmoaudio_read( //
struct CosmoAudio *ca, //
float *out_samples, //
int frameCount //
) COSMOAUDIO_ABI;
COSMOAUDIO_API int cosmoaudio_poll( //
struct CosmoAudio *ca, //
int *in_out_readFrames, //
int *in_out_writeFrames //
) COSMOAUDIO_ABI;
#ifdef __cplusplus
}
#endif