forked from tTh/FloatImg
V4L2 : heisenbug spotted around VIDIOC_DQBUF, infinite loop
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ce96b51ca4
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14ded65303
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@ -33,7 +33,6 @@
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/* compilation control */
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#define SAVE_AS_CUMUL 1
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#define SAVE_AS_PNM 0
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#define SAVE_AS_FIMG 0
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/* --------------------------------------------------------------------- */
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@ -190,6 +189,8 @@ if ((fmt.fmt.pix.width != width) || (fmt.fmt.pix.height != height)) {
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fmt.fmt.pix.width, fmt.fmt.pix.height);
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}
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fprintf(stderr,"--- Ok 1\n");
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CLEAR(req);
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req.count = 2;
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req.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
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@ -242,16 +243,14 @@ else {
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fimg_clear(&cumul);
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cumul.fval = 255.0; /* must be read from camera XXX */
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cumul.count = 0;
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to_save = &cumul;
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#endif
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type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
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xioctl(fd, VIDIOC_STREAMON, &type);
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#if 0
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if (verbosity) fprintf(stderr,"pid %d grabbing %d picz...\n",
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#if 1
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if (verbosity) fprintf(stderr,"pid %d is going to grab %d picz...\n",
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getpid(), nbre_capt);
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#endif
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@ -273,31 +272,17 @@ for (i = 0; i < nbre_capt; i++) {
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}
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if(verbosity > 1) {
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printf("%6d / %6d %9.3f\r", i, nbre_capt,
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fprintf(stderr, "%6d / %6d %9.3f\n", i, nbre_capt,
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fimg_timer_get(0));
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fflush(stderr);
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}
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CLEAR(buf);
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buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
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buf.memory = V4L2_MEMORY_MMAP;
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xioctl(fd, VIDIOC_DQBUF, &buf);
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#if SAVE_AS_PNM
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/* at this time,we'v got a picture in-memory,
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so we can blast in on storage */
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sprintf(out_name, "%s/%05d.ppm", dest_dir, i);
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if (verbosity > 1) fprintf(stderr, "--> %s\n", out_name);
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fout = fopen(out_name, "w");
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if (!fout) {
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perror("Cannot open image");
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exit(EXIT_FAILURE);
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}
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fprintf(fout, "P6\n%d %d 255\n",
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fmt.fmt.pix.width, fmt.fmt.pix.height);
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fwrite(buffers[buf.index].start, buf.bytesused, 1, fout);
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fclose(fout);
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#endif
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fprintf(stderr, "xioctl VIDIOC_DQBUF done\n"); fflush(stderr);
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#if SAVE_AS_CUMUL
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if (upscaling) {
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@ -0,0 +1,17 @@
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Heisenbug dans la capture d'image.
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CLEAR(buf);
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buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
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buf.memory = V4L2_MEMORY_MMAP;
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xioctl(fd, VIDIOC_DQBUF, &buf);
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ioctl(3, VIDIOC_DQBUF, {type=V4L2_BUF_TYPE_VIDEO_CAPTURE}) = -1 EAGAIN (Resource temporarily unavailable)
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ioctl(3, VIDIOC_DQBUF, {type=V4L2_BUF_TYPE_VIDEO_CAPTURE}) = -1 EAGAIN (Resource temporarily unavailable)
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ioctl(3, VIDIOC_DQBUF, {type=V4L2_BUF_TYPE_VIDEO_CAPTURE^Cstrace: Process 11181 detached
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