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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 */
/** */
/** Audio Class */
/** */
/**************************************************************************/
/**************************************************************************/
/* Include necessary system files. */
#define UX_SOURCE_CODE
#include "ux_api.h"
#include "ux_host_class_audio.h"
#include "ux_host_stack.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _ux_host_class_audio_read PORTABLE C */
/* 6.1.12 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function reads from the audio streaming interface. */
/* */
/* Note the request buffer should be ready for at least one packet, */
/* and request length is always limited to one packet size. */
/* */
/* INPUT */
/* */
/* audio Pointer to audio class */
/* audio_transfer_request Pointer to transfer request */
/* */
/* OUTPUT */
/* */
/* Completion Status */
/* */
/* CALLS */
/* */
/* _ux_host_class_audio_transfer_request Audio transfer request */
/* _ux_host_stack_class_instance_verify Verify instance is valid */
/* _ux_host_mutex_on Get mutex */
/* _ux_host_mutex_off Release mutex */
/* */
/* CALLED BY */
/* */
/* Application */
/* Audio Class */
/* */
/**************************************************************************/
UINT _ux_host_class_audio_read(UX_HOST_CLASS_AUDIO *audio, UX_HOST_CLASS_AUDIO_TRANSFER_REQUEST *audio_transfer_request)
{
UINT status;
ULONG mps;
/* If trace is enabled, insert this event into the trace buffer. */
UX_TRACE_IN_LINE_INSERT(UX_TRACE_HOST_CLASS_AUDIO_READ, audio, audio_transfer_request -> ux_host_class_audio_transfer_request_data_pointer,
audio_transfer_request -> ux_host_class_audio_transfer_request_requested_length, 0, UX_TRACE_HOST_CLASS_EVENTS, 0, 0)
/* Ensure the instance is valid. */
if (_ux_host_stack_class_instance_verify(_ux_system_host_class_audio_name, (VOID *) audio) != UX_SUCCESS)
{
/* Error trap. */
_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_CLASS, UX_HOST_CLASS_INSTANCE_UNKNOWN);
/* If trace is enabled, insert this event into the trace buffer. */
UX_TRACE_IN_LINE_INSERT(UX_TRACE_ERROR, UX_HOST_CLASS_INSTANCE_UNKNOWN, audio, 0, 0, UX_TRACE_ERRORS, 0, 0)
return(UX_HOST_CLASS_INSTANCE_UNKNOWN);
}
/* Protect thread reentry to this instance. */
_ux_host_mutex_on(&audio -> ux_host_class_audio_mutex);
/* Ensure we have a selected interface that allows isoch transmission. */
if (audio -> ux_host_class_audio_isochronous_endpoint -> ux_endpoint_descriptor.wMaxPacketSize == 0)
{
/* Unprotect thread reentry to this instance. */
_ux_host_mutex_off(&audio -> ux_host_class_audio_mutex);
/* Error trap. */
_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_CLASS, UX_HOST_CLASS_AUDIO_WRONG_INTERFACE);
/* Return error status. */
return(UX_HOST_CLASS_AUDIO_WRONG_INTERFACE);
}
/* For audio in, we read packets at a time, so the transfer request size is the size of the
endpoint max packet size. */
mps = _ux_host_class_audio_max_packet_size_get(audio);
audio_transfer_request -> ux_host_class_audio_transfer_request_packet_size = mps;
audio_transfer_request -> ux_host_class_audio_transfer_request_requested_length = mps;
/* Ask the stack to hook this transfer request to the iso ED. */
status = _ux_host_class_audio_transfer_request(audio, audio_transfer_request);
/* Unprotect thread reentry to this instance. */
_ux_host_mutex_off(&audio -> ux_host_class_audio_mutex);
/* Return completion status. */
return(status);
}
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _uxe_host_class_audio_read PORTABLE C */
/* 6.3.0 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function checks errors in audio read function call. */
/* */
/* INPUT */
/* */
/* audio Pointer to audio class */
/* audio_transfer_request Pointer to transfer request */
/* */
/* OUTPUT */
/* */
/* Status */
/* */
/* CALLS */
/* */
/* _ux_host_class_audio_read Hook a audio read request */
/* */
/* CALLED BY */
/* */
/* Application */
/* */
/**************************************************************************/
UINT _uxe_host_class_audio_read(UX_HOST_CLASS_AUDIO *audio, UX_HOST_CLASS_AUDIO_TRANSFER_REQUEST *audio_transfer_request)
{
/* Sanity checks. */
if ((UX_NULL == audio) || (audio_transfer_request == UX_NULL))
return(UX_INVALID_PARAMETER);
/* Invoke audio read function. */
return(_ux_host_class_audio_read(audio, audio_transfer_request));
}
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