v4l2-ctl: when streaming to file use bytesused instead of the full buffer.

This makes it possible to use v4l2-ctl to stream compressed video using
stream I/O.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>

diff --git a/utils/v4l2-ctl/v4l2-ctl-streaming.cpp b/utils/v4l2-ctl/v4l2-ctl-streaming.cpp
index 5a080e3..e23e317 100644 (file)
--- a/utils/v4l2-ctl/v4l2-ctl-streaming.cpp
+++ b/utils/v4l2-ctl/v4l2-ctl-streaming.cpp
@@ -674,11 +674,11 @@ void streaming_set(int fd)
                        if (fout && !stream_skip) {
                                for (unsigned j = 0; j < num_planes; j++) {
                                        unsigned p = buf.index * num_planes + j;
-                                       unsigned sz = fwrite(buffers[p], 1,
-                                                       buffer_lengths[p], fout);
+                                       unsigned used = is_mplane ? planes[j].bytesused : buf.bytesused;
+                                       unsigned sz = fwrite(buffers[p], 1, used, fout);
 
-                                       if (sz != buffer_lengths[p])
-                                               fprintf(stderr, "%u != %u\n", sz, buffer_lengths[p]);
+                                       if (sz != used)
+                                               fprintf(stderr, "%u != %u\n", sz, used);
                                }
                        }
                        if (doioctl(fd, VIDIOC_QBUF, &buf))