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/***************************************************************************
* Copyright (c) 2024 Microsoft Corporation
* Copyright (c) 2026-present Eclipse ThreadX contributors
*
* This program and the accompanying materials are made available under the
* terms of the MIT License which is available at
* https://opensource.org/licenses/MIT.
*
* SPDX-License-Identifier: MIT
**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** USBX Component */
/** */
/** Device Audio Class */
/** */
/**************************************************************************/
/**************************************************************************/
#define UX_SOURCE_CODE
/* Include necessary system files. */
#include "ux_api.h"
#include "ux_device_class_audio.h"
#include "ux_device_stack.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _ux_device_class_audio_sample_read16 PORTABLE C */
/* 6.2.1 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function reads 16-bit sample value from the Audio class. */
/* */
/* INPUT */
/* */
/* stream Address of audio stream */
/* instance */
/* buffer Pointer to buffer to save */
/* sample data */
/* */
/* OUTPUT */
/* */
/* None */
/* */
/* CALLS */
/* */
/* */
/* CALLED BY */
/* */
/* Application */
/* */
/**************************************************************************/
UINT _ux_device_class_audio_sample_read16(UX_DEVICE_CLASS_AUDIO_STREAM *stream,
USHORT *buffer)
{
UX_SLAVE_ENDPOINT *endpoint;
UX_SLAVE_DEVICE *device;
UCHAR *sample_ptr;
UCHAR *next_frame_buffer;
ULONG next_frame_sample;
/* Get the pointer to the device. */
device = &_ux_system_slave -> ux_system_slave_device;
/* As long as the device is in the CONFIGURED state. */
if (device -> ux_slave_device_state != UX_DEVICE_CONFIGURED)
{
/* Cannot proceed with command, the interface is down. */
return(UX_CONFIGURATION_HANDLE_UNKNOWN);
}
/* Check if endpoint is available. */
endpoint = stream -> ux_device_class_audio_stream_endpoint;
if (endpoint == UX_NULL)
return(UX_ERROR);
/* Check if endpoint direction is OK. */
if ((endpoint -> ux_slave_endpoint_descriptor.bEndpointAddress & UX_ENDPOINT_DIRECTION) != UX_ENDPOINT_OUT)
return(UX_ERROR);
/* Underflow!! */
if (stream -> ux_device_class_audio_stream_access_pos -> ux_device_class_audio_frame_length == 0)
{
return(UX_BUFFER_OVERFLOW);
}
/* Try to read a sample. */
sample_ptr = stream -> ux_device_class_audio_stream_access_pos -> ux_device_class_audio_frame_data +
stream -> ux_device_class_audio_stream_access_pos -> ux_device_class_audio_frame_pos;
if (buffer)
*buffer = *(USHORT *)(sample_ptr);
/* Update sample read state. */
next_frame_sample = stream -> ux_device_class_audio_stream_access_pos -> ux_device_class_audio_frame_pos + 2;
if (next_frame_sample >= stream -> ux_device_class_audio_stream_access_pos -> ux_device_class_audio_frame_length)
{
/* Set frame length to 0 to indicate no data. */
stream -> ux_device_class_audio_stream_access_pos -> ux_device_class_audio_frame_length = 0;
/* Move to next frame buffer. */
next_frame_sample = 0;
/* Move frame if it's not the last one. */
if (stream -> ux_device_class_audio_stream_access_pos != stream -> ux_device_class_audio_stream_transfer_pos)
{
next_frame_buffer = (UCHAR *)stream -> ux_device_class_audio_stream_access_pos;
next_frame_buffer += stream -> ux_device_class_audio_stream_frame_buffer_size;
if (next_frame_buffer >= stream -> ux_device_class_audio_stream_buffer + stream -> ux_device_class_audio_stream_buffer_size)
next_frame_buffer = stream -> ux_device_class_audio_stream_buffer;
stream -> ux_device_class_audio_stream_access_pos = (UX_DEVICE_CLASS_AUDIO_FRAME *)next_frame_buffer;
}
}
/* Update next sample position. */
stream -> ux_device_class_audio_stream_access_pos -> ux_device_class_audio_frame_pos = next_frame_sample;
return(UX_SUCCESS);
}
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _uxe_device_class_audio_sample_read16 PORTABLE C */
/* 6.2.1 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function checks errors in reading 16-bit sample function call. */
/* */
/* INPUT */
/* */
/* stream Address of audio stream */
/* instance */
/* buffer Pointer to buffer to save */
/* sample data */
/* */
/* OUTPUT */
/* */
/* None */
/* */
/* CALLS */
/* */
/* _ux_device_class_audio_sample_read16 Read 16-bit sample */
/* */
/* CALLED BY */
/* */
/* Application */
/* */
/**************************************************************************/
UINT _uxe_device_class_audio_sample_read16(UX_DEVICE_CLASS_AUDIO_STREAM *stream,
USHORT *buffer)
{
/* Sanity check. */
if (stream == UX_NULL)
return(UX_INVALID_PARAMETER);
/* Read 16-bit sample. */
return(_ux_device_class_audio_sample_read16(stream, buffer));
}
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