Audio Playback Interface

Simulate audio output device on a hardware board

Since R2021a

• 

Libraries:
SoC Blockset / Peripherals

Description

The Audio Playback Interface block simulates the behavior of an audio output device. The block receives audio samples as messages from a connected Audio Playback block that simulates audio driver code connected to your algorithm.

Ports

Input

msg — SoC message data

vector

This port receives data messages containing audio data from a connected Audio Playback block.

Data Types: SoCData

Output

data — Audio data frame

M-element vector | M-by-C matrix

When the block receives a single audio channel, the audio data frame is an M-element vector from a simulated hardware audio output. The Samples per frame parameter defines the number of samples, M, of audio data. When the block receives multiple audio channels, the audio data frame is an M-by-C matrix, where C is specified by the Number of channels parameter.

Dependencies

To enable this port, set the Output parameter to To output port.

Data Types: int8 | int16 | int32

Parameters

Output — Output type

To terminator (default) | To output port

Specify if the block acts as a terminator, similar to the Terminator block, or produces data to an output port.

Number of channels — Number of data channels

2 (default) | positive integer

Specify the number of audio channels, C, sent to the audio device. This number must match the Number of channels parameter in the Audio Playback block.

Samples per frame — Size of data vector read from audio device

4410 (default) | positive scalar integer

Specify the number of samples per frame, M, of audio data.

Sample time — Sample time in seconds

-1 (default) | positive scalar

Enter the sample time to be used by the timer-driven task subsystem when you clear the Enable event-based execution parameter.

Extended Capabilities

C/C++ Code Generation

Generate C and C++ code using Simulink® Coder™.

To automatically generate C code for your design, and execute on an SoC device, use the SoC Builder tool. To generate and execute C code for your SoC models, Embedded Coder^® features are required. For more information on generating code for SoC designs, see Use SoC Builder to Generate SoC Design.

Embedded Coder does not generate code for this block. In the generated code, the advanced Linux sound architecture (ALSA) driver framework performs audio output on the device. The related Audio Playback block represents the ALSA driver. For more information on the ALSA driver framework, see the Advanced Linux Sound Architecture website.

Version History

Introduced in R2021a