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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 Video Class */
/** */
/**************************************************************************/
/**************************************************************************/
#define UX_SOURCE_CODE
/* Include necessary system files. */
#include "ux_api.h"
#include "ux_device_class_video.h"
#include "ux_device_stack.h"
#if !defined(UX_DEVICE_STANDALONE)
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _ux_device_class_video_read_thread_entry PORTABLE C */
/* 6.3.0 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function is thread of ISO OUT from the Video class. */
/* */
/* INPUT */
/* */
/* video_stream Address of video stream */
/* instance */
/* */
/* OUTPUT */
/* */
/* None */
/* */
/* CALLS */
/* */
/* _ux_system_error_handler System error trap */
/* _ux_utility_thread_suspend Suspend thread used */
/* _ux_device_stack_transfer_request Issue transfer request */
/* _ux_utility_memory_copy Copy data */
/* */
/* CALLED BY */
/* */
/* ThreadX */
/* */
/**************************************************************************/
VOID _ux_device_class_video_read_thread_entry(ULONG video_stream)
{
UINT status;
UX_DEVICE_CLASS_VIDEO_STREAM *stream;
UX_SLAVE_DEVICE *device;
UX_SLAVE_ENDPOINT *endpoint;
UX_SLAVE_TRANSFER *transfer;
UCHAR *next_pos;
UX_DEVICE_CLASS_VIDEO_PAYLOAD *next_payload;
ULONG max_packet_size;
ULONG actual_length;
/* Get Video class instance. */
UX_THREAD_EXTENSION_PTR_GET(stream, UX_DEVICE_CLASS_VIDEO_STREAM, video_stream)
/* Get stack device instance. */
device = stream -> ux_device_class_video_stream_video -> ux_device_class_video_device;
/* This thread runs forever but can be suspended or resumed. */
while(1)
{
max_packet_size = 0;
while (device -> ux_slave_device_state == UX_DEVICE_CONFIGURED)
{
/* Get endpoint instance. */
endpoint = stream -> ux_device_class_video_stream_endpoint;
/* Endpoint not available, maybe it's alternate setting 0. */
if (endpoint == UX_NULL)
break;
/* Calculate transfer size based on packet size and number transactions once endpoint is available. */
if (max_packet_size == 0)
max_packet_size = endpoint -> ux_slave_endpoint_transfer_request.ux_slave_transfer_request_transfer_length;
/* Get transfer instance. */
transfer = &endpoint -> ux_slave_endpoint_transfer_request;
#if UX_DEVICE_ENDPOINT_BUFFER_OWNER == 1
/* Zero copy: directly use frame buffer for transfer. */
transfer -> ux_slave_transfer_request_data_pointer = stream ->
ux_device_class_video_stream_transfer_pos -> ux_device_class_video_payload_data;
#endif
/* Start payload transfer anyway. */
status = _ux_device_stack_transfer_request(transfer, max_packet_size, max_packet_size);
/* Check error. */
if (status != UX_SUCCESS)
{
/* Error notification! */
_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_CLASS, UX_TRANSFER_ERROR);
break;
}
/* Get actual transfer length. */
actual_length = transfer -> ux_slave_transfer_request_actual_length;
/* Frame received, log it. */
stream -> ux_device_class_video_stream_transfer_pos -> ux_device_class_video_payload_length = actual_length;
#if UX_DEVICE_ENDPOINT_BUFFER_OWNER == 1
/* Zero copy: data already in frame buffer. */
#else
/* Copy data from endpoint buffer. */
_ux_utility_memory_copy(stream -> ux_device_class_video_stream_transfer_pos -> ux_device_class_video_payload_data,
transfer -> ux_slave_transfer_request_data_pointer,
actual_length); /* Use case of memcpy is verified. */
#endif
/* For simple, do not advance the transfer position if there is overflow. */
next_pos = (UCHAR *)stream -> ux_device_class_video_stream_transfer_pos;
next_pos += stream -> ux_device_class_video_stream_payload_buffer_size;
if (next_pos >= stream -> ux_device_class_video_stream_buffer + stream -> ux_device_class_video_stream_buffer_size)
next_pos = stream -> ux_device_class_video_stream_buffer;
next_payload = (UX_DEVICE_CLASS_VIDEO_PAYLOAD *)next_pos;
/* Check overflow! */
if (next_payload -> ux_device_class_video_payload_length > 0)
{
/* Error notification! */
stream -> ux_device_class_video_stream_buffer_error_count ++;
_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_CLASS, UX_BUFFER_OVERFLOW);
}
else
/* Update transfer position. */
stream -> ux_device_class_video_stream_transfer_pos = next_payload;
/* Invoke notification callback. */
if (stream -> ux_device_class_video_stream_callbacks.ux_device_class_video_stream_payload_done != UX_NULL)
stream -> ux_device_class_video_stream_callbacks.ux_device_class_video_stream_payload_done(stream, actual_length);
}
/* We need to suspend ourselves. We will be resumed by the device enumeration module or when a change of alternate setting happens. */
_ux_utility_thread_suspend(&stream -> ux_device_class_video_stream_thread);
}
}
#endif
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