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yaml
---
r: 241762
b: refs/heads/master
c: c4c0a78
h: refs/heads/master
v: v3
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Pawel Osciak authored and Mauro Carvalho Chehab committed Mar 21, 2011
1 parent 5f13466 commit 1c02b33
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Showing 2 changed files with 19 additions and 19 deletions.
2 changes: 1 addition & 1 deletion [refs]
Original file line number Diff line number Diff line change
@@ -1,2 +1,2 @@
---
refs/heads/master: 08b99e26a347441c50c1113802801a122dd1eb7a
refs/heads/master: c4c0a78d459f2e4fcc7c4f3621a34e71ec7970d0
36 changes: 18 additions & 18 deletions trunk/Documentation/DocBook/v4l/io.xml
Original file line number Diff line number Diff line change
Expand Up @@ -141,63 +141,63 @@ struct {
} *buffers;
unsigned int i;

memset (&reqbuf, 0, sizeof (reqbuf));
memset(&reqbuf, 0, sizeof(reqbuf));
reqbuf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
reqbuf.memory = V4L2_MEMORY_MMAP;
reqbuf.count = 20;

if (-1 == ioctl (fd, &VIDIOC-REQBUFS;, &reqbuf)) {
if (errno == EINVAL)
printf ("Video capturing or mmap-streaming is not supported\n");
printf("Video capturing or mmap-streaming is not supported\n");
else
perror ("VIDIOC_REQBUFS");
perror("VIDIOC_REQBUFS");

exit (EXIT_FAILURE);
exit(EXIT_FAILURE);
}

/* We want at least five buffers. */

if (reqbuf.count < 5) {
/* You may need to free the buffers here. */
printf ("Not enough buffer memory\n");
exit (EXIT_FAILURE);
printf("Not enough buffer memory\n");
exit(EXIT_FAILURE);
}

buffers = calloc (reqbuf.count, sizeof (*buffers));
assert (buffers != NULL);
buffers = calloc(reqbuf.count, sizeof(*buffers));
assert(buffers != NULL);

for (i = 0; i < reqbuf.count; i++) {
&v4l2-buffer; buffer;

memset (&buffer, 0, sizeof (buffer));
memset(&buffer, 0, sizeof(buffer));
buffer.type = reqbuf.type;
buffer.memory = V4L2_MEMORY_MMAP;
buffer.index = i;

if (-1 == ioctl (fd, &VIDIOC-QUERYBUF;, &buffer)) {
perror ("VIDIOC_QUERYBUF");
exit (EXIT_FAILURE);
perror("VIDIOC_QUERYBUF");
exit(EXIT_FAILURE);
}

buffers[i].length = buffer.length; /* remember for munmap() */

buffers[i].start = mmap (NULL, buffer.length,
PROT_READ | PROT_WRITE, /* recommended */
MAP_SHARED, /* recommended */
fd, buffer.m.offset);
buffers[i].start = mmap(NULL, buffer.length,
PROT_READ | PROT_WRITE, /* recommended */
MAP_SHARED, /* recommended */
fd, buffer.m.offset);

if (MAP_FAILED == buffers[i].start) {
/* If you do not exit here you should unmap() and free()
the buffers mapped so far. */
perror ("mmap");
exit (EXIT_FAILURE);
perror("mmap");
exit(EXIT_FAILURE);
}
}

/* Cleanup. */

for (i = 0; i < reqbuf.count; i++)
munmap (buffers[i].start, buffers[i].length);
munmap(buffers[i].start, buffers[i].length);
</programlisting>
</example>

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