--- /dev/null
+/*
+# (C) 2008 Hans de Goede <j.w.r.degoede@hhs.nl>
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU Lesser General Public License as published by
+# the Free Software Foundation; either version 2.1 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+*/
+
+/* MAKING CHANGES TO THIS FILE?? READ THIS FIRST!!!
+
+ This file implements libv4l2, which offers v4l2_ prefixed versions of
+ open/close/etc. The API is 100% the same as directly opening /dev/videoX
+ using regular open/close/etc, the big difference is that format conversion
+ is done if necessary when capturing. That is if you (try to) set a capture
+ format which is not supported by the cam, but is supported by libv4lconvert,
+ then the try_fmt / set_fmt will succeed as if the cam supports the format
+ and on dqbuf / read the data will be converted for you and returned in
+ the request format.
+
+ Important note to people making changes to this file: All functions
+ (v4l2_close, v4l2_ioctl, etc.) are designed to function as their regular
+ counterpart when they get passed a fd that is not "registered" by libv4l2,
+ there are 2 reasons for this:
+ 1) This allows us to get completely out of the way when dealing with non
+ capture devices.
+ 2) libv4l2 is the base of the v4l2convert.so wrapper lib, which is a .so
+ which can be LD_PRELOAD-ed and the overrules the libc's open/close/etc,
+ and when opening /dev/videoX calls v4l2_open. Because we behave as the
+ regular counterpart when the fd is not known (instead of say throwing
+ an error), v4l2convert.so can simply call the v4l2_ prefixed function
+ for all wrapped functions (except for v4l2_open which will fail when not
+ called on a v4l2 device). This way the wrapper does not have to keep
+ track of which fd's are being handled by libv4l2, as libv4l2 already
+ keeps track of this itself.
+
+ This also means that libv4l2 may not use any of the regular functions
+ it mimics, as for example open could be a symbol in v4l2convert.so, which
+ in turn will call v4l2_open, so therefor v4l2_open (for example) may not
+ use the regular open()!
+
+ Another important note: libv4l2 does conversion for capture usage only, if
+ any calls are made which are passed a v4l2_buffer or v4l2_format with a
+ v4l2_buf_type which is different from V4L2_BUF_TYPE_VIDEO_CAPTURE, then
+ the v4l2_ methods behave exactly the same as their regular counterparts.
+ When modifications are made, one should be carefull that this behavior is
+ preserved.
+*/
+
+#define _LARGEFILE64_SOURCE 1
+
+#include <errno.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <syscall.h>
+#include <fcntl.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include "libv4l2.h"
+#include "libv4l2-priv.h"
+
+/* Note these flags are stored together with the flags passed to v4l2_fd_open()
+ in v4l2_dev_info's flags member, so care should be taken that the do not
+ use the same bits! */
+#define V4L2_STREAMON 0x0100
+
+#define V4L2_MMAP_OFFSET_MAGIC 0xABCDEF00u
+
+static pthread_mutex_t v4l2_open_mutex = PTHREAD_MUTEX_INITIALIZER;
+static struct v4l2_dev_info devices[V4L2_MAX_DEVICES] = { {-1}, {-1},
+ {-1}, {-1}, {-1}, {-1}, {-1}, {-1}, {-1}, {-1}, {-1}, {-1}, {-1}, {-1},
+ {-1}, {-1}};
+static int devices_used = 0;
+
+
+static int v4l2_request_read_buffers(int index)
+{
+ int result;
+ struct v4l2_requestbuffers req;
+
+ /* No-op if already done */
+ if (devices[index].no_frames)
+ return 0;
+
+ /* Request buffers */
+ req.count = devices[index].nreadbuffers;
+ req.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+ req.memory = V4L2_MEMORY_MMAP;
+ if ((result = syscall(SYS_ioctl, devices[index].fd, VIDIOC_REQBUFS, &req))){
+ int saved_err = errno;
+ V4L2_LOG_ERR("requesting buffers: %s\n", strerror(errno));
+ errno = saved_err;
+ return result;
+ }
+
+ devices[index].no_frames = MIN(req.count, V4L2_MAX_NO_FRAMES);
+ return 0;
+}
+
+static int v4l2_unrequest_read_buffers(int index)
+{
+ int result;
+ struct v4l2_requestbuffers req;
+
+ /* No-op of already done */
+ if (devices[index].no_frames == 0)
+ return 0;
+
+ /* (Un)Request buffers */
+ req.count = 0;
+ req.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+ req.memory = V4L2_MEMORY_MMAP;
+ if ((result = syscall(SYS_ioctl, devices[index].fd, VIDIOC_REQBUFS, &req))) {
+ int saved_err = errno;
+ V4L2_LOG_ERR("unrequesting buffers: %s\n", strerror(errno));
+ errno = saved_err;
+ return result;
+ }
+
+ devices[index].no_frames = MIN(req.count, V4L2_MAX_NO_FRAMES);
+ if (devices[index].no_frames) {
+ V4L2_LOG_ERR("number of buffers > 0 after requesting 0 buffers\n");
+ errno = EBUSY;
+ return -1;
+ }
+ return 0;
+}
+
+static int v4l2_map_buffers(int index)
+{
+ int result = 0;
+ unsigned int i;
+ struct v4l2_buffer buf;
+
+ for (i = 0; i < devices[index].no_frames; i++) {
+ if (devices[index].frame_pointers[i] != MAP_FAILED)
+ continue;
+
+ buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+ buf.memory = V4L2_MEMORY_MMAP;
+ buf.index = i;
+ result = syscall(SYS_ioctl, devices[index].fd, VIDIOC_QUERYBUF, &buf);
+ if (result) {
+ int saved_err = errno;
+ V4L2_LOG_ERR("querying buffer %u: %s\n", i, strerror(errno));
+ errno = saved_err;
+ break;
+ }
+
+ devices[index].frame_pointers[i] = mmap64(NULL, buf.length,
+ PROT_READ, MAP_SHARED, devices[index].fd, buf.m.offset);
+ if (devices[index].frame_pointers[i] == MAP_FAILED) {
+ int saved_err = errno;
+ V4L2_LOG_ERR("mmapping buffer %u: %s\n", i, strerror(errno));
+ errno = saved_err;
+ result = -1;
+ break;
+ }
+ V4L2_LOG("mapped buffer %u at %p\n", i,
+ devices[index].frame_pointers[i]);
+
+ devices[index].frame_sizes[i] = buf.length;
+ }
+
+ return result;
+}
+
+static void v4l2_unmap_buffers(int index)
+{
+ unsigned int i;
+
+ /* unmap the buffers */
+ for (i = 0; i < devices[index].no_frames; i++) {
+ if (devices[index].frame_pointers[i] != MAP_FAILED) {
+ syscall(SYS_munmap, devices[index].frame_pointers[i],
+ devices[index].frame_sizes[i]);
+ devices[index].frame_pointers[i] = MAP_FAILED;
+ V4L2_LOG("unmapped buffer %u\n", i);
+ }
+ }
+}
+
+static int v4l2_streamon(int index)
+{
+ int result;
+ enum v4l2_buf_type type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+
+ if (!(devices[index].flags & V4L2_STREAMON)) {
+ if ((result = syscall(SYS_ioctl, devices[index].fd, VIDIOC_STREAMON,
+ &type))) {
+ int saved_err = errno;
+ V4L2_LOG_ERR("turning on stream: %s\n", strerror(errno));
+ errno = saved_err;
+ return result;
+ }
+ devices[index].flags |= V4L2_STREAMON;
+ }
+
+ return 0;
+}
+
+static int v4l2_streamoff(int index)
+{
+ int result;
+ enum v4l2_buf_type type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+
+ if (devices[index].flags & V4L2_STREAMON) {
+ if ((result = syscall(SYS_ioctl, devices[index].fd, VIDIOC_STREAMOFF,
+ &type))) {
+ int saved_err = errno;
+ V4L2_LOG_ERR("turning off stream: %s\n", strerror(errno));
+ errno = saved_err;
+ return result;
+ }
+ devices[index].flags &= ~V4L2_STREAMON;
+
+ /* Stream off also unqueues all our buffers! */
+ devices[index].frame_queued = 0;
+ }
+
+ return 0;
+}
+
+static int v4l2_queue_read_buffer(int index, int buffer_index)
+{
+ int result;
+ struct v4l2_buffer buf;
+
+ if (devices[index].frame_queued & (1 << buffer_index))
+ return 0;
+
+ buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+ buf.memory = V4L2_MEMORY_MMAP;
+ buf.index = buffer_index;
+ if ((result = syscall(SYS_ioctl, devices[index].fd, VIDIOC_QBUF, &buf))) {
+ int saved_err = errno;
+ V4L2_LOG_ERR("queuing buf %d: %s\n", buffer_index, strerror(errno));
+ errno = saved_err;
+ return result;
+ }
+
+ devices[index].frame_queued |= 1 << buffer_index;
+ return 0;
+}
+
+static int v4l2_dequeue_read_buffer(int index, int *bytesused)
+{
+ int result;
+ struct v4l2_buffer buf;
+
+ buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+ buf.memory = V4L2_MEMORY_MMAP;
+ if ((result = syscall(SYS_ioctl, devices[index].fd, VIDIOC_DQBUF, &buf))) {
+ int saved_err = errno;
+ V4L2_LOG_ERR("dequeuing buf: %s\n", strerror(errno));
+ errno = saved_err;
+ return result;
+ }
+
+ devices[index].frame_queued &= ~(1 << buf.index);
+ *bytesused = buf.bytesused;
+ return buf.index;
+}
+
+static int v4l2_queue_read_buffers(int index)
+{
+ unsigned int i;
+ int last_error = EIO, queued = 0;
+
+ for (i = 0; i < devices[index].no_frames; i++) {
+ /* Don't queue unmapped buffers (should never happen) */
+ if (devices[index].frame_pointers[i] != MAP_FAILED) {
+ if (v4l2_queue_read_buffer(index, i)) {
+ last_error = errno;
+ continue;
+ }
+ queued++;
+ }
+ }
+
+ if (!queued) {
+ errno = last_error;
+ return -1;
+ }
+ return 0;
+}
+
+static int v4l2_activate_read_stream(int index)
+{
+ int result;
+
+ if ((result = v4l2_request_read_buffers(index)))
+ return result;
+
+ if ((result = v4l2_map_buffers(index)))
+ return result;
+
+ if ((result = v4l2_queue_read_buffers(index)))
+ return result;
+
+ return result = v4l2_streamon(index);
+}
+
+static int v4l2_deactivate_read_stream(int index)
+{
+ int result;
+
+ if ((result = v4l2_streamoff(index)))
+ return result;
+
+ /* No need to unqueue our buffers, streamoff does that for us */
+
+ v4l2_unmap_buffers(index);
+
+ if ((result = v4l2_unrequest_read_buffers(index)))
+ return result;
+
+ return 0;
+}
+
+
+int v4l2_open (const char *file, int oflag, ...)
+{
+ int fd;
+
+ /* original open code */
+ if (oflag & O_CREAT)
+ {
+ va_list ap;
+ mode_t mode;
+
+ va_start (ap, oflag);
+ mode = va_arg (ap, mode_t);
+
+ fd = syscall(SYS_open, file, oflag, mode);
+
+ va_end(ap);
+ }
+ else
+ fd = syscall(SYS_open, file, oflag);
+ /* end of original open code */
+
+ if (fd == -1)
+ return fd;
+
+ if (v4l2_fd_open(fd, 0) == -1) {
+ int saved_err = errno;
+ syscall(SYS_close, fd);
+ errno = saved_err;
+ return -1;
+ }
+
+ return fd;
+}
+
+int v4l2_fd_open(int fd, int v4l2_flags)
+{
+ int i, index;
+ char *lfname;
+ struct v4l2_capability cap;
+ struct v4l2_format fmt;
+ struct v4lconvert_data *convert;
+
+ /* If no log file was set by the app, see if one was specified through the
+ environment */
+ if (!v4l2_log_file && (lfname = getenv("LIBV4L2_LOG_FILENAME")))
+ v4l2_log_file = fopen(lfname, "w");
+
+ /* check that this is an v4l2 device */
+ if (syscall(SYS_ioctl, fd, VIDIOC_QUERYCAP, &cap)) {
+ int saved_err = errno;
+ V4L2_LOG_ERR("getting capabilities: %s\n", strerror(errno));
+ errno = saved_err;
+ return -1;
+ }
+
+ /* we only add functionality for video capture devices */
+ if (!(cap.capabilities & V4L2_CAP_VIDEO_CAPTURE))
+ return fd;
+
+ /* Get current cam format */
+ fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+ if (syscall(SYS_ioctl, fd, VIDIOC_G_FMT, &fmt)) {
+ int saved_err = errno;
+ V4L2_LOG_ERR("getting pixformat: %s\n", strerror(errno));
+ errno = saved_err;
+ return -1;
+ }
+
+ /* init libv4lconvert */
+ if (!(convert = v4lconvert_create(fd)))
+ return -1;
+
+ /* So we have a v4l2 capture device, register it in our devices array */
+ pthread_mutex_lock(&v4l2_open_mutex);
+ for (index = 0; index < V4L2_MAX_DEVICES; index++)
+ if(devices[index].fd == -1) {
+ devices[index].fd = fd;
+ break;
+ }
+ pthread_mutex_unlock(&v4l2_open_mutex);
+
+ if (index == V4L2_MAX_DEVICES) {
+ V4L2_LOG_ERR("attempting to open more then %d video devices\n",
+ V4L2_MAX_DEVICES);
+ errno = EBUSY;
+ return -1;
+ }
+
+ devices[index].flags = v4l2_flags;
+ devices[index].open_count = 1;
+ devices[index].src_fmt = fmt;
+ devices[index].dest_fmt = fmt;
+
+ pthread_mutex_init(&devices[index].stream_lock, NULL);
+
+ devices[index].no_frames = 0;
+ devices[index].nreadbuffers = V4L2_DEFAULT_NREADBUFFERS;
+ devices[index].io = v4l2_io_none;
+ devices[index].convert = convert;
+ devices[index].convert_mmap_buf = MAP_FAILED;
+ for (i = 0; i < V4L2_MAX_NO_FRAMES; i++) {
+ devices[index].frame_pointers[i] = MAP_FAILED;
+ }
+ devices[index].frame_queued = 0;
+ devices[index].frame_mapped = 0;
+ devices[index].frame_map_count = 0;
+
+ if (index >= devices_used)
+ devices_used = index + 1;
+
+ V4L2_LOG("open: %d\n", fd);
+
+ return fd;
+}
+
+/* Is this an fd for which we are emulating v4l1 ? */
+static int v4l2_get_index(int fd)
+{
+ int index;
+
+ /* We never handle fd -1 */
+ if (fd == -1)
+ return -1;
+
+ for (index = 0; index < devices_used; index++)
+ if (devices[index].fd == fd)
+ break;
+
+ if (index == devices_used)
+ return -1;
+
+ return index;
+}
+
+
+int v4l2_close(int fd)
+{
+ int index, result;
+
+ if ((index = v4l2_get_index(fd)) == -1)
+ return syscall(SYS_close, fd);
+
+ /* Abuse stream_lock to stop 2 closes from racing and trying to free the
+ resources twice */
+ pthread_mutex_lock(&devices[index].stream_lock);
+ devices[index].open_count--;
+ result = devices[index].open_count != 0;
+ pthread_mutex_unlock(&devices[index].stream_lock);
+
+ if (result)
+ return 0;
+
+ /* Free resources */
+ v4l2_unmap_buffers(index);
+ v4lconvert_destroy(devices[index].convert);
+ if (devices[index].convert_mmap_buf != MAP_FAILED) {
+ if (devices[index].frame_mapped || devices[index].frame_map_count)
+ V4L2_LOG(
+ "v4l2 mmap buffers still mapped on close(), mask: %08x, count: %d\n",
+ (unsigned int)devices[index].frame_mapped,
+ devices[index].frame_map_count);
+ else
+ syscall(SYS_munmap, devices[index].convert_mmap_buf,
+ devices[index].no_frames * V4L2_FRAME_BUF_SIZE);
+ devices[index].convert_mmap_buf = MAP_FAILED;
+ }
+
+ /* Remove the fd from our list of managed fds before closing it, because as
+ soon as we've done the actual close the fd maybe returned by an open in
+ another thread and we don't want to intercept calls to this new fd. */
+ devices[index].fd = -1;
+
+ /* Since we've marked the fd as no longer used, and freed the resources,
+ redo the close in case it was interrupted */
+ do {
+ result = syscall(SYS_close, fd);
+ } while (result == -1 && errno == EINTR);
+
+ V4L2_LOG("close: %d\n", fd);
+
+ return result;
+}
+
+int v4l2_dup(int fd)
+{
+ int index;
+
+ if ((index = v4l2_get_index(fd)) == -1)
+ return syscall(SYS_dup, fd);
+
+ devices[index].open_count++;
+
+ return fd;
+}
+
+static int v4l2_buf_ioctl_pre_check(int index, unsigned long int request,
+ struct v4l2_buffer *buf, int *result)
+{
+ if (buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) {
+ *result = syscall(SYS_ioctl, devices[index].fd, request, buf);
+ return 1;
+ }
+
+ /* IMPROVEME (maybe?) add support for userptr's? */
+ if (devices[index].io != v4l2_io_mmap ||
+ buf->memory != V4L2_MEMORY_MMAP ||
+ buf->index >= devices[index].no_frames) {
+ errno = EINVAL;
+ *result = -1;
+ return 1;
+ }
+
+ return 0;
+}
+
+int v4l2_ioctl (int fd, unsigned long int request, ...)
+{
+ void *arg;
+ va_list ap;
+ int result, converting, index, saved_err, stream_locked = 0;
+
+ va_start (ap, request);
+ arg = va_arg (ap, void *);
+ va_end (ap);
+
+ if ((index = v4l2_get_index(fd)) == -1)
+ return syscall(SYS_ioctl, fd, request, arg);
+
+ /* do we need to take the stream lock for this ioctl? */
+ switch (request) {
+ case VIDIOC_S_FMT:
+ case VIDIOC_G_FMT:
+ case VIDIOC_REQBUFS:
+ case VIDIOC_QUERYBUF:
+ case VIDIOC_QBUF:
+ case VIDIOC_DQBUF:
+ case VIDIOC_STREAMON:
+ case VIDIOC_STREAMOFF:
+ pthread_mutex_lock(&devices[index].stream_lock);
+ stream_locked = 1;
+ }
+
+ converting = devices[index].src_fmt.fmt.pix.pixelformat !=
+ devices[index].dest_fmt.fmt.pix.pixelformat;
+
+
+ switch (request) {
+ case VIDIOC_ENUM_FMT:
+ {
+ struct v4l2_fmtdesc *fmtdesc = arg;
+
+ if (fmtdesc->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
+ !(devices[index].flags & V4L2_ENABLE_ENUM_FMT_EMULATION))
+ result = syscall(SYS_ioctl, devices[index].fd, request, arg);
+ else
+ result = v4lconvert_enum_fmt(devices[index].convert, fmtdesc);
+ }
+ break;
+
+ case VIDIOC_TRY_FMT:
+ {
+ struct v4l2_format *fmt = arg;
+
+ if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
+ (devices[index].flags & V4L2_DISABLE_CONVERSION)) {
+ result = syscall(SYS_ioctl, devices[index].fd, VIDIOC_TRY_FMT, fmt);
+ break;
+ }
+
+ result = v4lconvert_try_format(devices[index].convert, fmt, NULL);
+ }
+ break;
+
+ case VIDIOC_S_FMT:
+ {
+ struct v4l2_format src_fmt, *dest_fmt = arg;
+
+ if (dest_fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) {
+ result = syscall(SYS_ioctl, devices[index].fd, VIDIOC_S_FMT,
+ dest_fmt);
+ break;
+ }
+
+ if (!memcmp(&devices[index].dest_fmt, dest_fmt, sizeof(*dest_fmt))) {
+ result = 0;
+ break;
+ }
+
+ /* Don't allow changing the format when mmap-ed IO is active, we could
+ allow this to happen in certain special circumstances, but it is
+ best to consistently deny this so that application developers do not
+ go expect this to work, because in their test setup it happens to
+ work. This also keeps the code much saner. */
+ if (devices[index].io == v4l2_io_mmap) {
+ errno = EBUSY;
+ result = -1;
+ break;
+ }
+
+ if (devices[index].flags & V4L2_DISABLE_CONVERSION) {
+ result = syscall(SYS_ioctl, devices[index].fd, VIDIOC_TRY_FMT,
+ dest_fmt);
+ src_fmt = *dest_fmt;
+ } else {
+ result = v4lconvert_try_format(devices[index].convert, dest_fmt,
+ &src_fmt);
+ }
+
+ if (result)
+ break;
+
+ /* Maybe after try format has adjusted width/height etc, to whats
+ available nothing has changed (on the cam side) ? */
+ if (!memcmp(&devices[index].src_fmt, &src_fmt, sizeof(src_fmt))) {
+ devices[index].dest_fmt = *dest_fmt;
+ result = 0;
+ break;
+ }
+
+ if (devices[index].io == v4l2_io_read) {
+ V4L2_LOG("deactivating read-stream for format change\n");
+ if ((result = v4l2_deactivate_read_stream(index))) {
+ /* Undo what we've done to leave things in a consisten state */
+ if (v4l2_activate_read_stream(index))
+ V4L2_LOG_ERR(
+ "reactivating stream after deactivate failure (AAIIEEEE)\n");
+ return result;
+ }
+ }
+
+ result = syscall(SYS_ioctl, devices[index].fd, VIDIOC_S_FMT, &src_fmt);
+ if (result) {
+ saved_err = errno;
+ V4L2_LOG_ERR("setting pixformat: %s\n", strerror(errno));
+ /* Report to the app dest_fmt has not changed */
+ *dest_fmt = devices[index].dest_fmt;
+ errno = saved_err;
+ break;
+ }
+
+ devices[index].src_fmt = src_fmt;
+ devices[index].dest_fmt = *dest_fmt;
+ }
+ break;
+
+ case VIDIOC_G_FMT:
+ {
+ struct v4l2_format* fmt = arg;
+
+ if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) {
+ result = syscall(SYS_ioctl, devices[index].fd, VIDIOC_G_FMT, fmt);
+ break;
+ }
+
+ *fmt = devices[index].dest_fmt;
+ result = 0;
+ }
+ break;
+
+ case VIDIOC_REQBUFS:
+ {
+ struct v4l2_requestbuffers *req = arg;
+
+ if (req->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) {
+ result = syscall(SYS_ioctl, devices[index].fd, request, arg);
+ return 1;
+ }
+
+ /* Don't allow mixing read / mmap io, either we control the buffers
+ (read based io), or the app does */
+ if (devices[index].io == v4l2_io_read) {
+ V4L2_LOG_ERR("to change from read io to mmap io open and close the device first!\n");
+ errno = EBUSY;
+ result = -1;
+ break;
+ }
+
+ /* Are any of our fake (convert_mmap_buf) buffers still mapped ? */
+ if (devices[index].frame_mapped || devices[index].frame_map_count) {
+ errno = EBUSY;
+ result = -1;
+ break;
+ }
+
+ /* IMPROVEME (maybe?) add support for userptr's? */
+ if (req->memory != V4L2_MEMORY_MMAP) {
+ errno = EINVAL;
+ result = -1;
+ break;
+ }
+
+ /* No more buffers then we can manage please */
+ if (req->count > V4L2_MAX_NO_FRAMES)
+ req->count = V4L2_MAX_NO_FRAMES;
+
+ /* Stop stream and unmap our real mapping of the buffers
+ (only relevant when we're converting, otherwise a no-op) */
+ v4l2_streamoff(index);
+ v4l2_unmap_buffers(index);
+
+ result = syscall(SYS_ioctl, devices[index].fd, VIDIOC_REQBUFS, req);
+ if (result)
+ break;
+
+ /* If we got more frames then we can handle lie to the app */
+ if (req->count > V4L2_MAX_NO_FRAMES)
+ req->count = V4L2_MAX_NO_FRAMES;
+
+ /* Force reallocation of convert_mmap_buf to fit the new no_frames */
+ syscall(SYS_munmap, devices[index].convert_mmap_buf,
+ devices[index].no_frames * V4L2_FRAME_BUF_SIZE);
+ devices[index].convert_mmap_buf = MAP_FAILED;
+ devices[index].no_frames = req->count;
+ devices[index].io = req->count? v4l2_io_mmap:v4l2_io_none;
+ }
+ break;
+
+ case VIDIOC_QUERYBUF:
+ {
+ struct v4l2_buffer *buf = arg;
+
+ if (v4l2_buf_ioctl_pre_check(index, request, buf, &result))
+ break;
+
+ /* Do a real query even when converting to let the driver fill in
+ things like buf->field */
+ result = syscall(SYS_ioctl, devices[index].fd, VIDIOC_QUERYBUF, buf);
+ if (result || !converting)
+ break;
+
+ buf->m.offset = V4L2_MMAP_OFFSET_MAGIC | buf->index;
+ buf->length = V4L2_FRAME_BUF_SIZE;
+ }
+ break;
+
+ case VIDIOC_QBUF:
+ {
+ struct v4l2_buffer *buf = arg;
+
+ if (v4l2_buf_ioctl_pre_check(index, request, buf, &result))
+ break;
+
+ result = syscall(SYS_ioctl, devices[index].fd, VIDIOC_QBUF, buf);
+ }
+ break;
+
+ case VIDIOC_DQBUF:
+ {
+ struct v4l2_buffer *buf = arg;
+
+ if (v4l2_buf_ioctl_pre_check(index, request, buf, &result))
+ break;
+
+ result = syscall(SYS_ioctl, devices[index].fd, VIDIOC_DQBUF, buf);
+ if (result || !converting)
+ break;
+
+ /* An application can do a DQBUF before mmap-ing in the buffer,
+ but we need the buffer _now_ to write our converted data
+ to it! */
+ if (devices[index].convert_mmap_buf == MAP_FAILED) {
+ devices[index].convert_mmap_buf = mmap64(NULL,
+ devices[index].no_frames *
+ V4L2_FRAME_BUF_SIZE,
+ PROT_READ|PROT_WRITE,
+ MAP_ANONYMOUS|MAP_PRIVATE,
+ -1, 0);
+ if (devices[index].convert_mmap_buf == MAP_FAILED) {
+ saved_err = errno;
+ V4L2_LOG_ERR("allocating conversion buffer\n");
+ errno = saved_err;
+ result = -1;
+ break;
+ }
+ }
+
+ /* Make sure we have the real v4l2 buffers mapped before trying to
+ read from them */
+ if ((result = v4l2_map_buffers(index)))
+ break;
+
+ result = v4lconvert_convert(devices[index].convert,
+ &devices[index].src_fmt, &devices[index].dest_fmt,
+ devices[index].frame_pointers[buf->index],
+ buf->bytesused,
+ devices[index].convert_mmap_buf +
+ buf->index * V4L2_FRAME_BUF_SIZE,
+ V4L2_FRAME_BUF_SIZE);
+ if (result < 0)
+ break;
+
+ buf->bytesused = result;
+ buf->length = V4L2_FRAME_BUF_SIZE;
+
+ result = 0;
+ }
+ break;
+
+ case VIDIOC_STREAMON:
+ case VIDIOC_STREAMOFF:
+ {
+ enum v4l2_buf_type *type = arg;
+
+ if (*type != V4L2_BUF_TYPE_VIDEO_CAPTURE) {
+ result = syscall(SYS_ioctl, devices[index].fd, request, type);
+ break;
+ }
+
+ if (devices[index].io != v4l2_io_mmap) {
+ errno = EINVAL;
+ result = -1;
+ break;
+ }
+
+ if (request == VIDIOC_STREAMON)
+ result = v4l2_streamon(index);
+ else
+ result = v4l2_streamoff(index);
+ }
+ break;
+
+ default:
+ result = syscall(SYS_ioctl, fd, request, arg);
+ }
+
+ if (stream_locked)
+ pthread_mutex_unlock(&devices[index].stream_lock);
+
+ saved_err = errno;
+ v4l2_log_ioctl(request, arg, result);
+ errno = saved_err;
+
+ return result;
+}
+
+
+ssize_t v4l2_read (int fd, void* buffer, size_t n)
+{
+ ssize_t result;
+ int index, bytesused, frame_index;
+
+ if ((index = v4l2_get_index(fd)) == -1)
+ return syscall(SYS_read, fd, buffer, n);
+
+ pthread_mutex_lock(&devices[index].stream_lock);
+
+ if (devices[index].io == v4l2_io_mmap) {
+ V4L2_LOG_ERR("to change from mmap io to read io first do request_buffers with a count of 0\n");
+ errno = EBUSY;
+ result = -1;
+ goto leave;
+ }
+ devices[index].io = v4l2_io_read;
+
+ if ((result = v4l2_activate_read_stream(index)))
+ goto leave;
+
+ if ((frame_index = v4l2_dequeue_read_buffer(index, &bytesused)) < 0) {
+ result = -1;
+ goto leave;
+ }
+
+ result = v4lconvert_convert(devices[index].convert,
+ &devices[index].src_fmt, &devices[index].dest_fmt,
+ devices[index].frame_pointers[frame_index], bytesused,
+ buffer, n);
+
+ v4l2_queue_read_buffer(index, frame_index);
+
+leave:
+ pthread_mutex_unlock(&devices[index].stream_lock);
+
+ return result;
+}
+
+void *v4l2_mmap(void *start, size_t length, int prot, int flags, int fd,
+ off_t offset)
+{
+ int index;
+ unsigned int buffer_index;
+ void *result;
+
+ if ((index = v4l2_get_index(fd)) == -1 ||
+ /* Check if the mmap data matches our answer to QUERY_BUF, if it doesn't
+ let the kernel handle it (to allow for mmap based non capture use) */
+ start || length != V4L2_FRAME_BUF_SIZE ||
+ (offset & ~0xff) != V4L2_MMAP_OFFSET_MAGIC) {
+ if (index != -1)
+ V4L2_LOG("Passing mmap(%p, %d, ..., %x, through to the driver\n",
+ start, (int)length, (int)offset);
+ return mmap64(start, length, prot, flags, fd, offset);
+ }
+
+ pthread_mutex_lock(&devices[index].stream_lock);
+
+ buffer_index = offset & 0xff;
+ if (buffer_index >= devices[index].no_frames ||
+ devices[index].io != v4l2_io_mmap ||
+ /* Got magic offset and not converting ?? */
+ devices[index].src_fmt.fmt.pix.pixelformat ==
+ devices[index].dest_fmt.fmt.pix.pixelformat) {
+ errno = EINVAL;
+ result = MAP_FAILED;
+ goto leave;
+ }
+
+ if (devices[index].convert_mmap_buf == MAP_FAILED) {
+ devices[index].convert_mmap_buf = mmap64(NULL,
+ devices[index].no_frames *
+ V4L2_FRAME_BUF_SIZE,
+ PROT_READ|PROT_WRITE,
+ MAP_ANONYMOUS|MAP_PRIVATE,
+ -1, 0);
+ if (devices[index].convert_mmap_buf == MAP_FAILED) {
+ int saved_err = errno;
+ V4L2_LOG_ERR("allocating conversion buffer\n");
+ errno = saved_err;
+ result = MAP_FAILED;
+ goto leave;
+ }
+ }
+
+ devices[index].frame_mapped |= 1 << buffer_index;
+ devices[index].frame_map_count++;
+
+ result = devices[index].convert_mmap_buf +
+ buffer_index * V4L2_FRAME_BUF_SIZE;
+
+ V4L2_LOG("Fake (conversion) mmap buf %u, seen by app at: %p\n",
+ buffer_index, result);
+
+leave:
+ pthread_mutex_unlock(&devices[index].stream_lock);
+
+ return result;
+}
+
+int v4l2_munmap(void *_start, size_t length)
+{
+ int index;
+ unsigned int buffer_index;
+ unsigned char *start = _start;
+
+ /* Is this memory ours? */
+ if (start != MAP_FAILED && length == V4L2_FRAME_BUF_SIZE) {
+ for (index = 0; index < devices_used; index++)
+ if (devices[index].fd != -1 &&
+ devices[index].convert_mmap_buf != MAP_FAILED &&
+ start >= devices[index].convert_mmap_buf &&
+ (start - devices[index].convert_mmap_buf) % length == 0)
+ break;
+
+ if (index != devices_used) {
+ int unmapped = 0;
+
+ pthread_mutex_lock(&devices[index].stream_lock);
+
+ buffer_index = (start - devices[index].convert_mmap_buf) / length;
+
+ /* Redo our checks now that we have the lock, things may have changed */
+ if (devices[index].convert_mmap_buf != MAP_FAILED &&
+ start >= devices[index].convert_mmap_buf &&
+ (start - devices[index].convert_mmap_buf) % length == 0 &&
+ buffer_index < devices[index].no_frames) {
+ devices[index].frame_mapped &= ~(1 << buffer_index);
+ if (devices[index].frame_map_count > 0)
+ devices[index].frame_map_count--;
+ unmapped = 1;
+ }
+
+ pthread_mutex_unlock(&devices[index].stream_lock);
+
+ if (unmapped) {
+ V4L2_LOG("v4l2 fake buffer munmap %p, %d\n", start, (int)length);
+ return 0;
+ }
+ }
+ }
+
+ V4L2_LOG("v4l2 unknown munmap %p, %d\n", start, (int)length);
+
+ return syscall(SYS_munmap, _start, length);
+}
+
+/* Misc utility functions */
+int v4l2_set_control(int fd, int cid, int value)
+{
+ struct v4l2_queryctrl qctrl = { .id = cid };
+ struct v4l2_control ctrl = { .id = cid };
+ int result;
+
+ if ((result = syscall(SYS_ioctl, fd, VIDIOC_QUERYCTRL, &qctrl)))
+ return result;
+
+ if (!(qctrl.flags & V4L2_CTRL_FLAG_DISABLED) &&
+ !(qctrl.flags & V4L2_CTRL_FLAG_GRABBED)) {
+ if (qctrl.type == V4L2_CTRL_TYPE_BOOLEAN)
+ ctrl.value = value? 1:0;
+ else
+ ctrl.value = (value * (qctrl.maximum - qctrl.minimum) + 32767) / 65535 +
+ qctrl.minimum;
+
+ result = syscall(SYS_ioctl, fd, VIDIOC_S_CTRL, &ctrl);
+ }
+
+ return result;
+}
+
+int v4l2_get_control(int fd, int cid)
+{
+ struct v4l2_queryctrl qctrl = { .id = cid };
+ struct v4l2_control ctrl = { .id = cid };
+
+ if (syscall(SYS_ioctl, fd, VIDIOC_QUERYCTRL, &qctrl))
+ return 0;
+
+ if (qctrl.flags & V4L2_CTRL_FLAG_DISABLED)
+ return 0;
+
+ if (syscall(SYS_ioctl, fd, VIDIOC_G_CTRL, &ctrl))
+ return 0;
+
+ return ((ctrl.value - qctrl.minimum) * 65535 +
+ (qctrl.maximum - qctrl.minimum) / 2) /
+ (qctrl.maximum - qctrl.minimum);
+}
--- /dev/null
+/*
+# (C) 2008 Hans de Goede <j.w.r.degoede@hhs.nl>
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU Lesser General Public License as published by
+# the Free Software Foundation; either version 2.1 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+*/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <linux/ioctl.h>
+/* These headers are not needed by us, but by linux/videodev2.h,
+ which is broken on some systems and doesn't include them itself :( */
+#include <sys/time.h>
+#include <asm/types.h>
+/* end broken header workaround includes */
+#include <linux/videodev2.h>
+
+#define ARRAY_SIZE(x) (sizeof(x)/sizeof((x)[0]))
+
+FILE *v4l2_log_file = NULL;
+
+static const char *v4l2_ioctls[] = {
+ /* start v4l2 ioctls */
+ [_IOC_NR(VIDIOC_QUERYCAP)] = "VIDIOC_QUERYCAP",
+ [_IOC_NR(VIDIOC_RESERVED)] = "VIDIOC_RESERVED",
+ [_IOC_NR(VIDIOC_ENUM_FMT)] = "VIDIOC_ENUM_FMT",
+ [_IOC_NR(VIDIOC_G_FMT)] = "VIDIOC_G_FMT",
+ [_IOC_NR(VIDIOC_S_FMT)] = "VIDIOC_S_FMT",
+ [_IOC_NR(VIDIOC_REQBUFS)] = "VIDIOC_REQBUFS",
+ [_IOC_NR(VIDIOC_QUERYBUF)] = "VIDIOC_QUERYBUF",
+ [_IOC_NR(VIDIOC_G_FBUF)] = "VIDIOC_G_FBUF",
+ [_IOC_NR(VIDIOC_S_FBUF)] = "VIDIOC_S_FBUF",
+ [_IOC_NR(VIDIOC_OVERLAY)] = "VIDIOC_OVERLAY",
+ [_IOC_NR(VIDIOC_QBUF)] = "VIDIOC_QBUF",
+ [_IOC_NR(VIDIOC_DQBUF)] = "VIDIOC_DQBUF",
+ [_IOC_NR(VIDIOC_STREAMON)] = "VIDIOC_STREAMON",
+ [_IOC_NR(VIDIOC_STREAMOFF)] = "VIDIOC_STREAMOFF",
+ [_IOC_NR(VIDIOC_G_PARM)] = "VIDIOC_G_PARM",
+ [_IOC_NR(VIDIOC_S_PARM)] = "VIDIOC_S_PARM",
+ [_IOC_NR(VIDIOC_G_STD)] = "VIDIOC_G_STD",
+ [_IOC_NR(VIDIOC_S_STD)] = "VIDIOC_S_STD",
+ [_IOC_NR(VIDIOC_ENUMSTD)] = "VIDIOC_ENUMSTD",
+ [_IOC_NR(VIDIOC_ENUMINPUT)] = "VIDIOC_ENUMINPUT",
+ [_IOC_NR(VIDIOC_G_CTRL)] = "VIDIOC_G_CTRL",
+ [_IOC_NR(VIDIOC_S_CTRL)] = "VIDIOC_S_CTRL",
+ [_IOC_NR(VIDIOC_G_TUNER)] = "VIDIOC_G_TUNER",
+ [_IOC_NR(VIDIOC_S_TUNER)] = "VIDIOC_S_TUNER",
+ [_IOC_NR(VIDIOC_G_AUDIO)] = "VIDIOC_G_AUDIO",
+ [_IOC_NR(VIDIOC_S_AUDIO)] = "VIDIOC_S_AUDIO",
+ [_IOC_NR(VIDIOC_QUERYCTRL)] = "VIDIOC_QUERYCTRL",
+ [_IOC_NR(VIDIOC_QUERYMENU)] = "VIDIOC_QUERYMENU",
+ [_IOC_NR(VIDIOC_G_INPUT)] = "VIDIOC_G_INPUT",
+ [_IOC_NR(VIDIOC_S_INPUT)] = "VIDIOC_S_INPUT",
+ [_IOC_NR(VIDIOC_G_OUTPUT)] = "VIDIOC_G_OUTPUT",
+ [_IOC_NR(VIDIOC_S_OUTPUT)] = "VIDIOC_S_OUTPUT",
+ [_IOC_NR(VIDIOC_ENUMOUTPUT)] = "VIDIOC_ENUMOUTPUT",
+ [_IOC_NR(VIDIOC_G_AUDOUT)] = "VIDIOC_G_AUDOUT",
+ [_IOC_NR(VIDIOC_S_AUDOUT)] = "VIDIOC_S_AUDOUT",
+ [_IOC_NR(VIDIOC_G_MODULATOR)] = "VIDIOC_G_MODULATOR",
+ [_IOC_NR(VIDIOC_S_MODULATOR)] = "VIDIOC_S_MODULATOR",
+ [_IOC_NR(VIDIOC_G_FREQUENCY)] = "VIDIOC_G_FREQUENCY",
+ [_IOC_NR(VIDIOC_S_FREQUENCY)] = "VIDIOC_S_FREQUENCY",
+ [_IOC_NR(VIDIOC_CROPCAP)] = "VIDIOC_CROPCAP",
+ [_IOC_NR(VIDIOC_G_CROP)] = "VIDIOC_G_CROP",
+ [_IOC_NR(VIDIOC_S_CROP)] = "VIDIOC_S_CROP",
+ [_IOC_NR(VIDIOC_G_JPEGCOMP)] = "VIDIOC_G_JPEGCOMP",
+ [_IOC_NR(VIDIOC_S_JPEGCOMP)] = "VIDIOC_S_JPEGCOMP",
+ [_IOC_NR(VIDIOC_QUERYSTD)] = "VIDIOC_QUERYSTD",
+ [_IOC_NR(VIDIOC_TRY_FMT)] = "VIDIOC_TRY_FMT",
+ [_IOC_NR(VIDIOC_ENUMAUDIO)] = "VIDIOC_ENUMAUDIO",
+ [_IOC_NR(VIDIOC_ENUMAUDOUT)] = "VIDIOC_ENUMAUDOUT",
+ [_IOC_NR(VIDIOC_G_PRIORITY)] = "VIDIOC_G_PRIORITY",
+ [_IOC_NR(VIDIOC_S_PRIORITY)] = "VIDIOC_S_PRIORITY",
+ [_IOC_NR(VIDIOC_G_SLICED_VBI_CAP)] = "VIDIOC_G_SLICED_VBI_CAP",
+ [_IOC_NR(VIDIOC_LOG_STATUS)] = "VIDIOC_LOG_STATUS",
+ [_IOC_NR(VIDIOC_G_EXT_CTRLS)] = "VIDIOC_G_EXT_CTRLS",
+ [_IOC_NR(VIDIOC_S_EXT_CTRLS)] = "VIDIOC_S_EXT_CTRLS",
+ [_IOC_NR(VIDIOC_TRY_EXT_CTRLS)] = "VIDIOC_TRY_EXT_CTRLS",
+};
+
+void v4l2_log_ioctl(unsigned long int request, void *arg, int result)
+{
+ const char *ioctl_str;
+ char buf[40];
+
+ if (!v4l2_log_file)
+ return;
+
+ if (_IOC_TYPE(request) == 'V' && _IOC_NR(request) < ARRAY_SIZE(v4l2_ioctls))
+ ioctl_str = v4l2_ioctls[_IOC_NR(request)];
+ else {
+ snprintf(buf, sizeof(buf), "unknown request: %c %d\n",
+ (int)_IOC_TYPE(request), (int)_IOC_NR(request));
+ ioctl_str = buf;
+ }
+
+ fprintf(v4l2_log_file, "request == %s\n", ioctl_str);
+
+ switch (request) {
+ case VIDIOC_G_FMT:
+ case VIDIOC_S_FMT:
+ case VIDIOC_TRY_FMT:
+ {
+ struct v4l2_format* fmt = arg;
+ int pixfmt = fmt->fmt.pix.pixelformat;
+
+ if (fmt->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
+ fprintf(v4l2_log_file, " pixelformat: %c%c%c%c %dx%d\n",
+ pixfmt & 0xff,
+ (pixfmt >> 8) & 0xff,
+ (pixfmt >> 16) & 0xff,
+ pixfmt >> 24,
+ fmt->fmt.pix.width,
+ fmt->fmt.pix.height);
+ fprintf(v4l2_log_file, " field: %d bytesperline: %d imagesize%d\n",
+ (int)fmt->fmt.pix.field, (int)fmt->fmt.pix.bytesperline,
+ (int)fmt->fmt.pix.sizeimage);
+ fprintf(v4l2_log_file, " colorspace: %d, priv: %x\n",
+ (int)fmt->fmt.pix.colorspace, (int)fmt->fmt.pix.priv);
+ }
+ }
+ break;
+ }
+
+ fprintf(v4l2_log_file, "result == %d\n", result);
+ fflush(v4l2_log_file);
+}
projects / platform / upstream / v4l-utils.git / commitdiff