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Improved Documentation and Logging for mmap functions in v4l2 plugin.

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This adds some documentation to the mmap functions and also
improves the logging by bumping errors to LOG_ERROR.
This commit is contained in:
fryshorts
2014-07-26 19:55:57 +02:00
parent 276a97877b
commit 273c244eff
1 changed files with 11 additions and 7 deletions
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18
plugins/linux-v4l2/v4l2-input.c
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@@ -204,8 +204,12 @@ static int_fast32_t v4l2_stop_capture(struct v4l2_data *data)
return 0;
}
/*
* create memory mapping for buffers
/**
* Create memory mapping for buffers
*
* This tries to map at least 2, preferably 4, buffers to userspace.
*
* @return 0 on success, -1 on failure
*/
static int_fast32_t v4l2_create_mmap(struct v4l2_data *data)
{
@@ -216,12 +220,12 @@ static int_fast32_t v4l2_create_mmap(struct v4l2_data *data)
req.memory = V4L2_MEMORY_MMAP;
if (v4l2_ioctl(data->dev, VIDIOC_REQBUFS, &req) < 0) {
blog(LOG_DEBUG, "request for buffers failed !");
blog(LOG_ERROR, "Request for buffers failed !");
return -1;
}
if (req.count < 2) {
blog(LOG_DEBUG, "not enough memory !");
blog(LOG_ERROR, "Device returned less than 2 buffers");
return -1;
}
@@ -236,7 +240,7 @@ static int_fast32_t v4l2_create_mmap(struct v4l2_data *data)
buf.index = i;
if (v4l2_ioctl(data->dev, VIDIOC_QUERYBUF, &buf) < 0) {
blog(LOG_ERROR, "failed to query buffer");
blog(LOG_ERROR, "Failed to query buffer details");
return -1;
}
@@ -254,8 +258,8 @@ static int_fast32_t v4l2_create_mmap(struct v4l2_data *data)
return 0;
}
/*
* destroy memory mapping for buffers
/**
* Destroy memory mapping for buffers
*/
static void v4l2_destroy_mmap(struct v4l2_data *data)
{