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Bela
Real-time, ultra-low-latency audio and sensor processing system for BeagleBone Black
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Bela
Real-time, ultra-low-latency audio and sensor processing system for BeagleBone Black
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#include <PRU.h>
Public Member Functions | |
| operator BelaContext () | |
Public Attributes | |
| float * | audioIn |
| Buffer holding audio input samples. More... | |
| float * | audioOut |
| Buffer holding audio output samples. More... | |
| float * | analogIn |
| Buffer holding analog input samples. More... | |
| float * | analogOut |
| Buffer holding analog output samples. More... | |
| uint32_t * | digital |
| Buffer holding digital input/output samples. More... | |
| uint32_t | audioFrames |
| Number of audio frames per period. | |
| uint32_t | audioInChannels |
| Number of input audio channels. | |
| uint32_t | audioOutChannels |
| Number of output audio channels. | |
| float | audioSampleRate |
| Audio sample rate in Hz (currently always 44100.0) | |
| uint32_t | analogFrames |
| Number of analog frames per period. More... | |
| uint32_t | analogInChannels |
| Number of input analog channels. More... | |
| uint32_t | analogOutChannels |
| Number of output analog channels. More... | |
| float | analogSampleRate |
| Analog sample rate in Hz. More... | |
| uint32_t | digitalFrames |
| Number of digital frames per period. | |
| uint32_t | digitalChannels |
| Number of digital channels. More... | |
| float | digitalSampleRate |
| Digital sample rate in Hz (currently always 44100.0) | |
| uint64_t | audioFramesElapsed |
| Number of elapsed audio frames since the start of rendering. More... | |
| uint32_t | multiplexerChannels |
| Number of multiplexer channels for each analog input. More... | |
| uint32_t | multiplexerStartingChannel |
| Multiplexer channel corresponding to the first analog frame. More... | |
| float * | multiplexerAnalogIn |
| Buffer which holds multiplexed analog inputs, when multiplexer capelet is enabled. More... | |
| uint32_t | audioExpanderEnabled |
| Flags for whether audio expander is enabled on given analog channels. More... | |
| uint32_t | flags |
| Other audio/sensor settings. More... | |
| char | projectName [MAX_PROJECTNAME_LENGTH] |
| Name of running project. | |
| unsigned int | underrunCount |
| Number of detected underruns. | |
Internal version of the BelaContext struct which does not have const elements, so it can be modified by the code. When it's passed to the user code, it is typecast to the standard BelaContext.
Important: make sure this retains the same structure as BelaContext!
| float* _InternalBelaContext::audioIn |
Buffer holding audio input samples.
This buffer may be in either interleaved or non-interleaved format, depending on the contents of the BelaInitSettings structure. Note: this element is available in render() only.
| float* _InternalBelaContext::audioOut |
Buffer holding audio output samples.
This buffer may be in either interleaved or non-interleaved format, depending on the contents of the BelaInitSettings structure. Note: this element is available in render() only.
| float* _InternalBelaContext::analogIn |
Buffer holding analog input samples.
This buffer may be in either interleaved or non-interleaved format, depending on the contents of the BelaInitSettings structure. Note: this element is available in render() only.
| float* _InternalBelaContext::analogOut |
Buffer holding analog output samples.
This buffer may be in either interleaved or non-interleaved format, depending on the contents of the BelaInitSettings structure. Note: this element is available in render() only.
| uint32_t* _InternalBelaContext::digital |
Buffer holding digital input/output samples.
Note: this element is available in render() only.
| uint32_t _InternalBelaContext::analogFrames |
Number of analog frames per period.
This will be 0 if analog I/O is disabled.
| uint32_t _InternalBelaContext::analogInChannels |
Number of input analog channels.
This will be 0 if analog I/O is disabled.
| uint32_t _InternalBelaContext::analogOutChannels |
Number of output analog channels.
This will be 0 if analog I/O is disabled.
| float _InternalBelaContext::analogSampleRate |
Analog sample rate in Hz.
The analog sample rate depends on the number of analog channels used. If 8 channels are used, the sample rate is 22050. If 4 channels are used, the sample rate is 44100. If 2 channels are used, the sample rate is 88200. If analog I/O is disabled, the sample rate is 0.
| uint32_t _InternalBelaContext::digitalChannels |
Number of digital channels.
Currently this will always be 16, unless digital I/O is disabled, in which case it will be 0.
| uint64_t _InternalBelaContext::audioFramesElapsed |
Number of elapsed audio frames since the start of rendering.
This holds the total number of audio frames as of the beginning of the current period. To find the current number of analog or digital frames elapsed, multiply by the ratio of the sample rates (e.g. half the number of analog frames will have elapsed if the analog sample rate is 22050).
| uint32_t _InternalBelaContext::multiplexerChannels |
Number of multiplexer channels for each analog input.
This will be 2, 4 or 8 if the multiplexer capelet is enabled, otherwise it will be 1. 2, 4 and 8 correspond to 16, 32 and 64 analog inputs, respectively.
| uint32_t _InternalBelaContext::multiplexerStartingChannel |
Multiplexer channel corresponding to the first analog frame.
This indicates the multiplexer setting corresponding to the first analog frame in the buffer.
| float* _InternalBelaContext::multiplexerAnalogIn |
Buffer which holds multiplexed analog inputs, when multiplexer capelet is enabled.
Because the analog in buffer size may be smaller than a complete cycle of the multiplexer capelet, this buffer will always be big enough to hold at least one complete cycle of all channels. It will be null if the multiplexer capelet is not enabled.
| uint32_t _InternalBelaContext::audioExpanderEnabled |
Flags for whether audio expander is enabled on given analog channels.
Bits 0-15, when set, indicate audio expander enabled on the analog inputs. Bits 16-31 indicate audio expander enabled on the analog outputs.
| uint32_t _InternalBelaContext::flags |
Other audio/sensor settings.
Binary combination of flags including:
BELA_FLAG_INTERLEAVED: indicates the audio and analog buffers are interleaved
BELA_FLAG_ANALOG_OUTPUTS_PERSIST: indicates that writes to the analog outputs will persist for future frames. If not set, writes affect one frame only.
1.8.6
