PeterBee97 commented on code in PR #7798: URL: https://github.com/apache/nuttx/pull/7798#discussion_r1041018670
########## arch/sim/src/sim/posix/sim_video_host.c: ########## @@ -0,0 +1,350 @@ +/**************************************************************************** + * arch/sim/src/sim/posix/sim_video_host.c + * + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. The + * ASF licenses this file to you under the Apache License, Version 2.0 (the + * "License"); you may not use this file except in compliance with the + * License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT + * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the + * License for the specific language governing permissions and limitations + * under the License. + * + ****************************************************************************/ + +/**************************************************************************** + * Included Files + ****************************************************************************/ + +#include <errno.h> +#include <fcntl.h> +#include <stdbool.h> +#include <stdio.h> +#include <stdlib.h> +#include <stdint.h> +#include <string.h> +#include <syslog.h> +#include <unistd.h> +#include <linux/videodev2.h> +#include <sys/mman.h> +#include <sys/ioctl.h> + +/**************************************************************************** + * Pre-processor Definitions + ****************************************************************************/ + +#define MAX_REQBUFS 3 +#define WARN(fmt, ...) \ + syslog(LOG_WARNING, "sim_video_host: " fmt "\n", ##__VA_ARGS__) + +/**************************************************************************** + * Private Types + ****************************************************************************/ + +typedef struct +{ + int fd; + struct v4l2_requestbuffers reqbuf; + void *addrs[MAX_REQBUFS]; + size_t buflen[MAX_REQBUFS]; +} video_host_dev_t; + +/**************************************************************************** + * Private Function Prototypes + ****************************************************************************/ + +/**************************************************************************** + * Private Data + ****************************************************************************/ + +static video_host_dev_t priv; + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +static int xioctl(int fd, int request, void *arg) +{ + int r; + do + { + r = ioctl(fd, request, arg); + } + while (-1 == r && EINTR == errno); + + return r; +} + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +bool video_host_is_available(const char *video_host_dev_path) +{ + if (access(video_host_dev_path, F_OK) == 0) + { + return true; + } + + return false; +} + +int video_host_init(const char *video_host_dev_path) +{ + int fd = open(video_host_dev_path, O_RDWR | O_NONBLOCK); + if (fd < 0) + { + perror(video_host_dev_path); + return -errno; + } + + memset(&priv, 0, sizeof(priv)); + priv.fd = fd; + return 0; +} + +int video_host_dq_buf(uint8_t *addr, uint32_t size) +{ + struct v4l2_buffer buf; + + memset(&buf, 0, sizeof(buf)); + buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; + buf.memory = V4L2_MEMORY_MMAP; + + /* Dequeue a buffer */ + + if (-1 == xioctl(priv.fd, VIDIOC_DQBUF, &buf)) + { + switch (errno) + { + case EAGAIN: + + /* No buffer in the outgoing queue */ + + return 0; + case EIO: + + /* fall through */ + + default: + perror("VIDIOC_DQBUF"); + return -errno; + } + } + + if (size > buf.bytesused) + { + size = buf.bytesused; + } + + memcpy(addr, priv.addrs[buf.index], size); + if (-1 == ioctl(priv.fd, VIDIOC_QBUF, &buf)) + { + perror("VIDIOC_QBUF"); + return -errno; + } + + return size; +} + +int video_host_uninit(void) +{ + close(priv.fd); + return 0; +} + +int video_host_data_init(void) +{ + return 0; +} + +int video_host_start_capture(void) +{ + struct v4l2_buffer buf; + int i; + + /* VIDIOC_REQBUFS initiate user pointer I/O */ + + priv.reqbuf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; + priv.reqbuf.memory = V4L2_MEMORY_MMAP; + priv.reqbuf.count = MAX_REQBUFS; + + if (-1 == xioctl(priv.fd, VIDIOC_REQBUFS, &priv.reqbuf)) + { + perror("VIDIOC_REQBUFS"); + return -errno; + } + + if (priv.reqbuf.count < 2) + { + errno = ENOMEM; + perror("Not enough buffers"); + return -ENOMEM; + } + + for (i = 0; i < priv.reqbuf.count; i++) + { + memset(&buf, 0, sizeof(buf)); + buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; + buf.memory = V4L2_MEMORY_MMAP; + buf.index = i; + if (-1 == xioctl(priv.fd, VIDIOC_QUERYBUF, &buf)) + { + perror("VIDIOC_QUERYBUF"); + return -errno; + } + + priv.addrs[i] = mmap(NULL, buf.length, PROT_READ | PROT_WRITE, + MAP_SHARED, priv.fd, buf.m.offset); + priv.buflen[i] = buf.length; + if (priv.addrs[i] == MAP_FAILED) + { + perror("Mmap failed"); + return -errno; + } + + if (-1 == xioctl(priv.fd, VIDIOC_QBUF, &buf)) + { + perror("VIDIOC_QBUF"); + return -errno; + } + } + + enum v4l2_buf_type type = V4L2_BUF_TYPE_VIDEO_CAPTURE; + if (-1 == xioctl(priv.fd, VIDIOC_STREAMON, &type)) + { + perror("VIDIOC_STREAMON"); + return -errno; + } + + return 0; +} + +int video_host_stop_capture(void) +{ + enum v4l2_buf_type type = V4L2_BUF_TYPE_VIDEO_CAPTURE; + int i; + + if (-1 == xioctl(priv.fd, VIDIOC_STREAMOFF, &type)) + { + perror("VIDIOC_STREAMOFF"); + return -errno; + } + + for (i = 0; i < priv.reqbuf.count; i++) + { + munmap(priv.addrs[i], priv.buflen[i]); + } + + return 0; +} + +int video_host_set_fmt(uint16_t width, uint16_t height, uint32_t fmt, + uint32_t denom, uint32_t numer) +{ + struct v4l2_format v4l2_fmt = + { + 0 + }; + + v4l2_fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; + + v4l2_fmt.fmt.pix.width = width; + v4l2_fmt.fmt.pix.height = height; + v4l2_fmt.fmt.pix.pixelformat = fmt; + v4l2_fmt.fmt.pix.field = V4L2_FIELD_NONE; + + if (-1 == xioctl(priv.fd, VIDIOC_S_FMT, &v4l2_fmt)) + { + perror("VIDIOC_S_FMT"); + return -errno; + } + + struct v4l2_streamparm streamparm = + { + 0 + }; + + streamparm.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; + if (-1 == xioctl(priv.fd, VIDIOC_G_PARM, &streamparm)) + { + perror("VIDIOC_G_PARM"); + return -errno; + } + + streamparm.parm.capture.capturemode |= V4L2_CAP_TIMEPERFRAME; + streamparm.parm.capture.timeperframe.numerator = numer; + streamparm.parm.capture.timeperframe.denominator = denom; + if (-1 == xioctl(priv.fd, VIDIOC_S_PARM, &streamparm)) + { + perror("VIDIOC_S_PARM"); + return -errno; + } + + return 0; +} + +int video_host_try_fmt(uint16_t width, uint16_t height, uint32_t fmt, + uint32_t denom, uint32_t numer) +{ + struct v4l2_format v4l2_fmt = + { + 0 + }; + + v4l2_fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; + + v4l2_fmt.fmt.pix.width = width; + v4l2_fmt.fmt.pix.height = height; + v4l2_fmt.fmt.pix.pixelformat = fmt; + v4l2_fmt.fmt.pix.field = V4L2_FIELD_NONE; + + if (-1 == xioctl(priv.fd, VIDIOC_TRY_FMT, &v4l2_fmt)) + { + perror("VIDIOC_TRY_FMT"); + return -errno; + } + + if (v4l2_fmt.fmt.pix.pixelformat != fmt) + { + WARN("Pixel format not supported"); + return -EINVAL; + } + + struct v4l2_frmivalenum v4l2_frmival = Review Comment: done -- This is an automated message from the Apache Git Service. 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