From 2bb0cfbf8137e02cc32aae3b36f85ef7300e8936 Mon Sep 17 00:00:00 2001 From: Laurent Pinchart Date: Sat, 9 Jun 2018 14:29:41 +0300 Subject: Split UVC gadget into a library and test application Split the project into a UVC gadget library and a test application. To avoid rolling out a custom build system, switch to CMake. Signed-off-by: Laurent Pinchart --- v4l2.c | 833 ----------------------------------------------------------------- 1 file changed, 833 deletions(-) delete mode 100644 v4l2.c (limited to 'v4l2.c') diff --git a/v4l2.c b/v4l2.c deleted file mode 100644 index 9030270..0000000 --- a/v4l2.c +++ /dev/null @@ -1,833 +0,0 @@ -/* SPDX-License-Identifier: LGPL-2.1-or-later */ -/* - * V4L2 Devices - * - * Copyright (C) 2018 Laurent Pinchart - * - * This file originally comes from the omap3-isp-live project - * (git://git.ideasonboard.org/omap3-isp-live.git) - * - * Copyright (C) 2010-2011 Ideas on board SPRL - * - * Contact: Laurent Pinchart - */ - -#include -#include -#include -#include -#include -#include -#include - -#include - -#include -#include -#include -#include - -#include "list.h" -#include "tools.h" -#include "v4l2.h" -#include "video-buffers.h" - -#ifndef V4L2_BUF_FLAG_ERROR -#define V4L2_BUF_FLAG_ERROR 0x0040 -#endif - -struct v4l2_ival_desc { - struct v4l2_fract min; - struct v4l2_fract max; - struct v4l2_fract step; - - struct list_entry list; -}; - -struct v4l2_frame_desc { - unsigned int min_width; - unsigned int min_height; - unsigned int max_width; - unsigned int max_height; - unsigned int step_width; - unsigned int step_height; - - struct list_entry list; - struct list_entry ivals; -}; - -struct v4l2_format_desc { - unsigned int pixelformat; - - struct list_entry list; - struct list_entry frames; -}; - -/* ----------------------------------------------------------------------------- - * Formats enumeration - */ - -static int -v4l2_enum_frame_intervals(struct v4l2_device *dev, struct v4l2_format_desc *format, - struct v4l2_frame_desc *frame) -{ - struct v4l2_ival_desc *ival; - unsigned int i; - int ret; - - for (i = 0; ; ++i) { - struct v4l2_frmivalenum ivalenum; - - memset(&ivalenum, 0, sizeof ivalenum); - ivalenum.index = i; - ivalenum.pixel_format = format->pixelformat; - ivalenum.width = frame->min_width; - ivalenum.height = frame->min_height; - ret = ioctl(dev->fd, VIDIOC_ENUM_FRAMEINTERVALS, &ivalenum); - if (ret < 0) - break; - - if (i != ivalenum.index) - printf("Warning: driver returned wrong ival index " - "%u.\n", ivalenum.index); - if (format->pixelformat != ivalenum.pixel_format) - printf("Warning: driver returned wrong ival pixel " - "format %08x.\n", ivalenum.pixel_format); - if (frame->min_width != ivalenum.width) - printf("Warning: driver returned wrong ival width " - "%u.\n", ivalenum.width); - if (frame->min_height != ivalenum.height) - printf("Warning: driver returned wrong ival height " - "%u.\n", ivalenum.height); - - ival = malloc(sizeof *ival); - if (ival == NULL) - return -ENOMEM; - - memset(ival, 0, sizeof *ival); - - switch (ivalenum.type) { - case V4L2_FRMIVAL_TYPE_DISCRETE: - ival->min = ivalenum.discrete; - ival->max = ivalenum.discrete; - ival->step.numerator = 1; - ival->step.denominator = 1; - break; - - case V4L2_FRMIVAL_TYPE_STEPWISE: - ival->min = ivalenum.stepwise.min; - ival->max = ivalenum.stepwise.max; - ival->step = ivalenum.stepwise.step; - break; - - default: - printf("Error: driver returned invalid frame ival " - "type %u\n", ivalenum.type); - return -EINVAL; - } - - list_append(&ival->list, &frame->ivals); - } - - return 0; -} - -static int -v4l2_enum_frame_sizes(struct v4l2_device *dev, struct v4l2_format_desc *format) -{ - struct v4l2_frame_desc *frame; - unsigned int i; - int ret; - - for (i = 0; ; ++i) { - struct v4l2_frmsizeenum frmenum; - - memset(&frmenum, 0, sizeof frmenum); - frmenum.index = i; - frmenum.pixel_format = format->pixelformat; - - ret = ioctl(dev->fd, VIDIOC_ENUM_FRAMESIZES, &frmenum); - if (ret < 0) - break; - - if (i != frmenum.index) - printf("Warning: driver returned wrong frame index " - "%u.\n", frmenum.index); - if (format->pixelformat != frmenum.pixel_format) - printf("Warning: driver returned wrong frame pixel " - "format %08x.\n", frmenum.pixel_format); - - frame = malloc(sizeof *frame); - if (frame == NULL) - return -ENOMEM; - - memset(frame, 0, sizeof *frame); - - list_init(&frame->ivals); - frame->step_width = 1; - frame->step_height = 1; - - switch (frmenum.type) { - case V4L2_FRMSIZE_TYPE_DISCRETE: - frame->min_width = frmenum.discrete.width; - frame->min_height = frmenum.discrete.height; - frame->max_width = frmenum.discrete.width; - frame->max_height = frmenum.discrete.height; - break; - - case V4L2_FRMSIZE_TYPE_STEPWISE: - frame->step_width = frmenum.stepwise.step_width; - frame->step_height = frmenum.stepwise.step_height; - /* fallthrough */ - case V4L2_FRMSIZE_TYPE_CONTINUOUS: - frame->min_width = frmenum.stepwise.min_width; - frame->min_height = frmenum.stepwise.min_height; - frame->max_width = frmenum.stepwise.max_width; - frame->max_height = frmenum.stepwise.max_height; - break; - - default: - printf("Error: driver returned invalid frame size " - "type %u\n", frmenum.type); - return -EINVAL; - } - - list_append(&frame->list, &format->frames); - - ret = v4l2_enum_frame_intervals(dev, format, frame); - if (ret < 0) - return ret; - } - - return 0; -} -static int v4l2_enum_formats(struct v4l2_device *dev) -{ - struct v4l2_format_desc *format; - unsigned int i; - int ret; - - for (i = 0; ; ++i) { - struct v4l2_fmtdesc fmtenum; - - memset(&fmtenum, 0, sizeof fmtenum); - fmtenum.index = i; - fmtenum.type = dev->type; - - ret = ioctl(dev->fd, VIDIOC_ENUM_FMT, &fmtenum); - if (ret < 0) - break; - - if (i != fmtenum.index) - printf("Warning: driver returned wrong format index " - "%u.\n", fmtenum.index); - if (dev->type != fmtenum.type) - printf("Warning: driver returned wrong format type " - "%u.\n", fmtenum.type); - - format = malloc(sizeof *format); - if (format == NULL) - return -ENOMEM; - - memset(format, 0, sizeof *format); - - list_init(&format->frames); - format->pixelformat = fmtenum.pixelformat; - - list_append(&format->list, &dev->formats); - - ret = v4l2_enum_frame_sizes(dev, format); - if (ret < 0) - return ret; - } - - return 0; -} - -/* ----------------------------------------------------------------------------- - * Open/close - */ - -struct v4l2_device *v4l2_open(const char *devname) -{ - struct v4l2_device *dev; - struct v4l2_capability cap; - __u32 capabilities; - int ret; - - dev = malloc(sizeof *dev); - if (dev == NULL) - return NULL; - - memset(dev, 0, sizeof *dev); - dev->fd = -1; - dev->name = strdup(devname); - list_init(&dev->formats); - - dev->fd = open(devname, O_RDWR | O_NONBLOCK); - if (dev->fd < 0) { - printf("Error opening device %s: %d.\n", devname, errno); - v4l2_close(dev); - return NULL; - } - - memset(&cap, 0, sizeof cap); - ret = ioctl(dev->fd, VIDIOC_QUERYCAP, &cap); - if (ret < 0) { - printf("Error opening device %s: unable to query " - "device.\n", devname); - v4l2_close(dev); - return NULL; - } - - /* - * If the device_caps field is set use it, otherwise use the older - * capabilities field. - */ - capabilities = cap.device_caps ? : cap.capabilities; - - if (capabilities & V4L2_CAP_VIDEO_CAPTURE) - dev->type = V4L2_BUF_TYPE_VIDEO_CAPTURE; - else if (capabilities & V4L2_CAP_VIDEO_OUTPUT) - dev->type = V4L2_BUF_TYPE_VIDEO_OUTPUT; - else { - printf("Error opening device %s: neither video capture " - "nor video output supported.\n", devname); - v4l2_close(dev); - return NULL; - } - - ret = v4l2_enum_formats(dev); - if (ret < 0) { - printf("Error opening device %s: unable to enumerate " - "formats.\n", devname); - v4l2_close(dev); - return NULL; - } - - printf("Device %s opened: %s (%s).\n", devname, cap.card, cap.bus_info); - - return dev; -} - -void v4l2_close(struct v4l2_device *dev) -{ - struct v4l2_format_desc *format, *next_fmt; - struct v4l2_frame_desc *frame, *next_frm; - struct v4l2_ival_desc *ival, *next_ival; - - if (dev == NULL) - return; - - list_for_each_entry_safe(format, next_fmt, &dev->formats, list) { - list_for_each_entry_safe(frame, next_frm, &format->frames, list) { - list_for_each_entry_safe(ival, next_ival, &frame->ivals, list) { - free(ival); - } - free(frame); - } - free(format); - } - - free(dev->name); - close(dev->fd); - free(dev); -} - -/* ----------------------------------------------------------------------------- - * Controls - */ - -int v4l2_get_control(struct v4l2_device *dev, unsigned int id, int32_t *value) -{ - struct v4l2_control ctrl; - int ret; - - ctrl.id = id; - - ret = ioctl(dev->fd, VIDIOC_G_CTRL, &ctrl); - if (ret < 0) { - printf("%s: unable to get control (%d).\n", dev->name, errno); - return -errno; - } - - *value = ctrl.value; - return 0; -} - -int v4l2_set_control(struct v4l2_device *dev, unsigned int id, int32_t *value) -{ - struct v4l2_control ctrl; - int ret; - - ctrl.id = id; - ctrl.value = *value; - - ret = ioctl(dev->fd, VIDIOC_S_CTRL, &ctrl); - if (ret < 0) { - printf("%s: unable to set control (%d).\n", dev->name, errno); - return -errno; - } - - *value = ctrl.value; - return 0; -} - -int v4l2_get_controls(struct v4l2_device *dev, unsigned int count, - struct v4l2_ext_control *ctrls) -{ - struct v4l2_ext_controls controls; - int ret; - - memset(&controls, 0, sizeof controls); - controls.count = count; - controls.controls = ctrls; - - ret = ioctl(dev->fd, VIDIOC_G_EXT_CTRLS, &controls); - if (ret < 0) - printf("%s: unable to get multiple controls (%d).\n", dev->name, - errno); - - return ret; -} - -int v4l2_set_controls(struct v4l2_device *dev, unsigned int count, - struct v4l2_ext_control *ctrls) -{ - struct v4l2_ext_controls controls; - int ret; - - memset(&controls, 0, sizeof controls); - controls.count = count; - controls.controls = ctrls; - - ret = ioctl(dev->fd, VIDIOC_S_EXT_CTRLS, &controls); - if (ret < 0) - printf("%s: unable to set multiple controls (%d).\n", dev->name, - errno); - - return ret; -} - -/* ----------------------------------------------------------------------------- - * Formats and frame rates - */ - -int v4l2_get_crop(struct v4l2_device *dev, struct v4l2_rect *rect) -{ - struct v4l2_crop crop; - int ret; - - memset(&crop, 0, sizeof crop); - crop.type = dev->type; - - ret = ioctl(dev->fd, VIDIOC_G_CROP, &crop); - if (ret < 0) { - printf("%s: unable to get crop rectangle (%d).\n", dev->name, - errno); - return -errno; - } - - dev->crop = crop.c; - *rect = crop.c; - - return 0; -} - -int v4l2_set_crop(struct v4l2_device *dev, struct v4l2_rect *rect) -{ - struct v4l2_crop crop; - int ret; - - memset(&crop, 0, sizeof crop); - crop.type = dev->type; - crop.c = *rect; - - ret = ioctl(dev->fd, VIDIOC_S_CROP, &crop); - if (ret < 0) { - printf("%s: unable to set crop rectangle (%d).\n", dev->name, - errno); - return -errno; - } - - dev->crop = crop.c; - *rect = crop.c; - - return 0; -} - -int v4l2_get_format(struct v4l2_device *dev, struct v4l2_pix_format *format) -{ - struct v4l2_format fmt; - int ret; - - memset(&fmt, 0, sizeof fmt); - fmt.type = dev->type; - - ret = ioctl(dev->fd, VIDIOC_G_FMT, &fmt); - if (ret < 0) { - printf("%s: unable to get format (%d).\n", dev->name, errno); - return -errno; - } - - dev->format = fmt.fmt.pix; - *format = fmt.fmt.pix; - - return 0; -} - -int v4l2_set_format(struct v4l2_device *dev, struct v4l2_pix_format *format) -{ - struct v4l2_format fmt; - int ret; - - memset(&fmt, 0, sizeof fmt); - fmt.type = dev->type; - fmt.fmt.pix.width = format->width; - fmt.fmt.pix.height = format->height; - fmt.fmt.pix.pixelformat = format->pixelformat; - fmt.fmt.pix.field = V4L2_FIELD_ANY; - - ret = ioctl(dev->fd, VIDIOC_S_FMT, &fmt); - if (ret < 0) { - printf("%s: unable to set format (%d).\n", dev->name, errno); - return -errno; - } - - dev->format = fmt.fmt.pix; - *format = fmt.fmt.pix; - - return 0; -} - -/* ----------------------------------------------------------------------------- - * Buffers management - */ - -int v4l2_alloc_buffers(struct v4l2_device *dev, enum v4l2_memory memtype, - unsigned int nbufs) -{ - struct v4l2_requestbuffers rb; - unsigned int i; - int ret; - - if (dev->buffers.nbufs != 0) - return -EBUSY; - - if (memtype != V4L2_MEMORY_MMAP && memtype != V4L2_MEMORY_DMABUF) - return -EINVAL; - - /* Request the buffers from the driver. */ - memset(&rb, 0, sizeof rb); - rb.count = nbufs; - rb.type = dev->type; - rb.memory = memtype; - - ret = ioctl(dev->fd, VIDIOC_REQBUFS, &rb); - if (ret < 0) { - printf("%s: unable to request buffers (%d).\n", dev->name, - errno); - ret = -errno; - goto done; - } - - if (rb.count > nbufs) { - printf("%s: driver needs more buffers (%u) than available (%u).\n", - dev->name, rb.count, nbufs); - ret = -E2BIG; - goto done; - } - - printf("%s: %u buffers requested.\n", dev->name, rb.count); - - /* Allocate the buffer objects. */ - dev->memtype = memtype; - dev->buffers.nbufs = rb.count; - - dev->buffers.buffers = calloc(nbufs, sizeof *dev->buffers.buffers); - if (dev->buffers.buffers == NULL) { - ret = -ENOMEM; - goto done; - } - - for (i = 0; i < dev->buffers.nbufs; ++i) { - dev->buffers.buffers[i].index = i; - dev->buffers.buffers[i].dmabuf = -1; - } - - ret = 0; - -done: - if (ret < 0) - v4l2_free_buffers(dev); - - return ret; -} - -int v4l2_free_buffers(struct v4l2_device *dev) -{ - struct v4l2_requestbuffers rb; - unsigned int i; - int ret; - - if (dev->buffers.nbufs == 0) - return 0; - - for (i = 0; i < dev->buffers.nbufs; ++i) { - struct video_buffer *buffer = &dev->buffers.buffers[i]; - - if (buffer->mem) { - ret = munmap(buffer->mem, buffer->size); - if (ret < 0) { - printf("%s: unable to unmap buffer %u (%d)\n", - dev->name, i, errno); - return -errno; - } - - buffer->mem = NULL; - } - - if (buffer->dmabuf != -1) { - close(buffer->dmabuf); - buffer->dmabuf = -1; - } - - buffer->size = 0; - } - - memset(&rb, 0, sizeof rb); - rb.count = 0; - rb.type = dev->type; - rb.memory = dev->memtype; - - ret = ioctl(dev->fd, VIDIOC_REQBUFS, &rb); - if (ret < 0) { - printf("%s: unable to release buffers (%d)\n", dev->name, - errno); - return -errno; - } - - free(dev->buffers.buffers); - dev->buffers.buffers = NULL; - dev->buffers.nbufs = 0; - - return 0; -} - -int v4l2_export_buffers(struct v4l2_device *dev) -{ - unsigned int i; - int ret; - - if (dev->buffers.nbufs == 0) - return -EINVAL; - - if (dev->memtype != V4L2_MEMORY_MMAP) - return -EINVAL; - - for (i = 0; i < dev->buffers.nbufs; ++i) { - struct v4l2_exportbuffer expbuf = { - .type = dev->type, - .index = i, - }; - struct v4l2_buffer buf = { - .index = i, - .type = dev->type, - .memory = dev->memtype, - }; - - ret = ioctl(dev->fd, VIDIOC_QUERYBUF, &buf); - if (ret < 0) { - printf("%s: unable to query buffer %u (%d).\n", - dev->name, i, errno); - return -errno; - } - - ret = ioctl(dev->fd, VIDIOC_EXPBUF, &expbuf); - if (ret < 0) { - printf("Failed to export buffer %u.\n", i); - return -errno; - } - - dev->buffers.buffers[i].size = buf.length; - dev->buffers.buffers[i].dmabuf = expbuf.fd; - - printf("%s: buffer %u exported with fd %u.\n", - dev->name, i, dev->buffers.buffers[i].dmabuf); - } - - return 0; -} - -int v4l2_import_buffers(struct v4l2_device *dev, - const struct video_buffer_set *buffers) -{ - unsigned int i; - int ret; - - if (dev->buffers.nbufs == 0 || dev->buffers.nbufs > buffers->nbufs) - return -EINVAL; - - if (dev->memtype != V4L2_MEMORY_DMABUF) - return -EINVAL; - - for (i = 0; i < dev->buffers.nbufs; ++i) { - const struct video_buffer *buffer = &buffers->buffers[i]; - struct v4l2_buffer buf = { - .index = i, - .type = dev->type, - .memory = dev->memtype, - }; - int fd; - - ret = ioctl(dev->fd, VIDIOC_QUERYBUF, &buf); - if (ret < 0) { - printf("%s: unable to query buffer %u (%d).\n", - dev->name, i, errno); - return -errno; - } - - if (buffer->size < buf.length) { - printf("%s: buffer %u too small (%u bytes required, %u bytes available).\n", - dev->name, i, buf.length, buffer->size); - return -EINVAL; - } - - fd = dup(buffer->dmabuf); - if (fd < 0) { - printf("%s: failed to duplicate dmabuf fd %d.\n", - dev->name, buffer->dmabuf); - return ret; - } - - printf("%s: buffer %u valid.\n", dev->name, i); - - dev->buffers.buffers[i].dmabuf = fd; - dev->buffers.buffers[i].size = buffer->size; - } - - return 0; -} - -int v4l2_mmap_buffers(struct v4l2_device *dev) -{ - unsigned int i; - int ret; - - if (dev->memtype != V4L2_MEMORY_MMAP) - return -EINVAL; - - for (i = 0; i < dev->buffers.nbufs; ++i) { - struct video_buffer *buffer = &dev->buffers.buffers[i]; - struct v4l2_buffer buf = { - .index = i, - .type = dev->type, - .memory = dev->memtype, - }; - void *mem; - - ret = ioctl(dev->fd, VIDIOC_QUERYBUF, &buf); - if (ret < 0) { - printf("%s: unable to query buffer %u (%d).\n", - dev->name, i, errno); - return -errno; - } - - mem = mmap(0, buf.length, PROT_READ | PROT_WRITE, MAP_SHARED, - dev->fd, buf.m.offset); - if (mem == MAP_FAILED) { - printf("%s: unable to map buffer %u (%d)\n", - dev->name, i, errno); - return -errno; - } - - buffer->mem = mem; - buffer->size = buf.length; - - printf("%s: buffer %u mapped at address %p.\n", dev->name, i, - mem); - } - - return 0; -} - -int v4l2_dequeue_buffer(struct v4l2_device *dev, struct video_buffer *buffer) -{ - struct v4l2_buffer buf; - int ret; - - memset(&buf, 0, sizeof buf); - buf.type = dev->type; - buf.memory = dev->memtype; - - ret = ioctl(dev->fd, VIDIOC_DQBUF, &buf); - if (ret < 0) { - printf("%s: unable to dequeue buffer index %u/%u (%d)\n", - dev->name, buf.index, dev->buffers.nbufs, errno); - return -errno; - } - - buffer->index = buf.index; - buffer->bytesused = buf.bytesused; - buffer->timestamp = buf.timestamp; - buffer->error = !!(buf.flags & V4L2_BUF_FLAG_ERROR); - - return 0; -} - -int v4l2_queue_buffer(struct v4l2_device *dev, struct video_buffer *buffer) -{ - struct v4l2_buffer buf; - int ret; - - if (buffer->index >= dev->buffers.nbufs) - return -EINVAL; - - memset(&buf, 0, sizeof buf); - buf.index = buffer->index; - buf.type = dev->type; - buf.memory = dev->memtype; - - if (dev->memtype == V4L2_MEMORY_DMABUF) - buf.m.fd = (unsigned long)dev->buffers.buffers[buffer->index].dmabuf; - - if (dev->type == V4L2_BUF_TYPE_VIDEO_OUTPUT) - buf.bytesused = buffer->bytesused; - - ret = ioctl(dev->fd, VIDIOC_QBUF, &buf); - if (ret < 0) { - printf("%s: unable to queue buffer index %u/%u (%d)\n", - dev->name, buf.index, dev->buffers.nbufs, errno); - return -errno; - } - - return 0; -} - -/* ----------------------------------------------------------------------------- - * Stream management - */ - -int v4l2_stream_on(struct v4l2_device *dev) -{ - int type = dev->type; - int ret; - - ret = ioctl(dev->fd, VIDIOC_STREAMON, &type); - if (ret < 0) - return -errno; - - return 0; -} - -int v4l2_stream_off(struct v4l2_device *dev) -{ - int type = dev->type; - int ret; - - ret = ioctl(dev->fd, VIDIOC_STREAMOFF, &type); - if (ret < 0) - return -errno; - - return 0; -} -- cgit v1.2.3