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v4l2codec: decoder: Add allocation helper

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This commit is contained in:
Nicolas Dufresne 2020-02-12 23:39:25 -05:00
parent 7ae57631d4
commit d476e6d689
2 changed files with 92 additions and 0 deletions
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80
sys/v4l2codecs/gstv4l2decoder.c
View file

@ -222,6 +222,86 @@ gst_v4l2_decoder_select_src_format (GstV4l2Decoder * self, GstVideoInfo * info)
return TRUE;
}
static guint32
direction_to_buffer_type (GstPadDirection direction)
{
if (direction == GST_PAD_SRC)
return V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
else
return V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE;
}
gint
gst_v4l2_decoder_request_buffers (GstV4l2Decoder * self,
GstPadDirection direction, guint num_buffers)
{
gint ret;
struct v4l2_requestbuffers reqbufs = {
.count = num_buffers,
.memory = V4L2_MEMORY_MMAP,
.type = direction_to_buffer_type (direction),
};
GST_DEBUG_OBJECT (self, "Requesting %u buffers", num_buffers);
ret = ioctl (self->video_fd, VIDIOC_REQBUFS, &reqbufs);
if (ret < 0) {
GST_ERROR_OBJECT (self, "VIDIOC_REQBUFS failed: %s", g_strerror (errno));
return ret;
}
return reqbufs.count;
}
gboolean
gst_v4l2_decoder_export_buffer (GstV4l2Decoder * self,
GstPadDirection direction, gint index, gint * fds, gsize * sizes,
gsize * offsets, guint * num_fds)
{
gint i, ret;
struct v4l2_plane planes[GST_VIDEO_MAX_PLANES] = { {0} };
struct v4l2_buffer v4l2_buf = {
.index = 0,
.type = direction_to_buffer_type (direction),
.length = GST_VIDEO_MAX_PLANES,
.m.planes = planes,
};
ret = ioctl (self->video_fd, VIDIOC_QUERYBUF, &v4l2_buf);
if (ret < 0) {
GST_ERROR_OBJECT (self, "VIDIOC_QUERYBUF failed: %s", g_strerror (errno));
return FALSE;
}
*num_fds = v4l2_buf.length;
for (i = 0; i < v4l2_buf.length; i++) {
struct v4l2_plane *plane = v4l2_buf.m.planes + i;
struct v4l2_exportbuffer expbuf = {
.type = direction_to_buffer_type (direction),
.index = index,
.plane = i,
.flags = O_CLOEXEC | O_RDWR,
};
ret = ioctl (self->video_fd, VIDIOC_EXPBUF, &expbuf);
if (ret < 0) {
gint j;
GST_ERROR_OBJECT (self, "VIDIOC_EXPBUF failed: %s", g_strerror (errno));
for (j = i - 1; j >= 0; j--)
close (fds[j]);
return FALSE;
}
fds[i] = expbuf.fd;
sizes[i] = plane->length;
offsets[i] = plane->data_offset;
}
return TRUE;
}
void
gst_v4l2_decoder_install_properties (GObjectClass * gobject_class,
gint prop_offset, GstV4l2CodecDevice * device)

12
sys/v4l2codecs/gstv4l2decoder.h
View file

@ -45,6 +45,18 @@ gboolean gst_v4l2_decoder_set_sink_fmt (GstV4l2Decoder * self, guint32
gboolean gst_v4l2_decoder_select_src_format (GstV4l2Decoder * self,
GstVideoInfo * info);
gint gst_v4l2_decoder_request_buffers (GstV4l2Decoder * self,
GstPadDirection direction,
guint num_buffers);
gboolean gst_v4l2_decoder_export_buffer (GstV4l2Decoder * self,
GstPadDirection directon,
gint index,
gint * fds,
gsize * sizes,
gsize * offsets,
guint *num_fds);
void gst_v4l2_decoder_install_properties (GObjectClass * gobject_class,
gint prop_offset,
GstV4l2CodecDevice * device);