pcm_capabilities.hpp File Reference

Turns what a PCM driver reports (rate range, channel range, period range) into the lists a DeviceInfo carries. More...

#include <algorithm>
#include <array>
#include <cstdint>
#include <iterator>
#include <optional>
#include <vector>

Go to the source code of this file.

Classes
struct	pulp::audio::PcmCapabilities
	What one direction (playback or capture) of a device can do. More...
struct	pulp::audio::PcmDeviceSummary
	The lists and channel counts a DeviceInfo carries for one device. More...

Namespaces
namespace	pulp
namespace	pulp::audio
namespace	pulp::audio::detail

Functions
const std::array< unsigned, 13 > &	pulp::audio::standard_sample_rates ()
	Rates worth offering when a driver reports a continuous range.
std::vector< double >	pulp::audio::sample_rates_from (const PcmCapabilities &caps)
	Sample rates the device supports, ascending.
std::vector< int >	pulp::audio::buffer_sizes_from (const PcmCapabilities &caps, unsigned periods_per_buffer=2)
	Callback buffer sizes (frames), ascending: the powers of two inside the driver's period range such that periods_per_buffer periods still fit in the largest buffer.
template<typename T>
std::vector< T >	pulp::audio::detail::intersect_sorted (const std::vector< T > &a, const std::vector< T > &b)
PcmDeviceSummary	pulp::audio::summarize_pcm_capabilities (const std::optional< PcmCapabilities > &playback, const std::optional< PcmCapabilities > &capture)
	Summarise the probed directions.

Detailed Description

Turns what a PCM driver reports (rate range, channel range, period range) into the lists a DeviceInfo carries.

Deliberately free of the device header so it adds nothing to that header's include fan-out. The conversion is plain arithmetic on numbers, so it lives apart from any platform audio API and can be tested on every host.