ardour/livetrax
13
0
Fork 0
Code

add an interface to select playback buffers/period

Browse Source
This commit is contained in:
Robin Gareus 2015-12-04 10:04:22 +01:00
parent d237165e21
commit 13926d9bbb
1 changed files with 17 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
libs/ardour/ardour/audio_backend.h
View File

@ -228,6 +228,22 @@ class LIBARDOUR_API AudioBackend : public PortEngine {
virtual std::vector<DeviceStatus> enumerate_output_devices () const
{ return std::vector<DeviceStatus>(); }
/** An interface to set buffers/period for playback latency.
* useful for ALSA or JACK/ALSA on Linux.
*
* @return true if the backend supports period-size configuration
*/
virtual bool can_set_period_size () const { return false; }
/** Returns a vector of supported period-sizes for the given driver */
virtual std::vector<uint32_t> available_period_sizes (const std::string& driver) const { return std::vector<uint32_t>(); }
/** Set the period size to be used.
* must be called before starting the backend.
*/
virtual int set_peridod_size (uint32_t) { return -1; }
/**
* @return true if backend supports requesting an update to the device list
* and any cached properties associated with the devices.
@ -426,6 +442,7 @@ class LIBARDOUR_API AudioBackend : public PortEngine {
virtual uint32_t systemic_output_latency () const = 0;
virtual uint32_t systemic_midi_input_latency (std::string const) const = 0;
virtual uint32_t systemic_midi_output_latency (std::string const) const = 0;
virtual uint32_t period_size () const { return 0; }
/** override this if this implementation returns true from
* requires_driver_selection()