Replace V4L2 subdev selection targets with the V4L2 ones
[media-ctl.git] / src / v4l2subdev.c
index 785209b..d0c37f3 100644 (file)
@@ -1,20 +1,22 @@
 /*
- * Media controller test application
+ * V4L2 subdev interface library
  *
- * Copyright (C) 2010 Ideas on board SPRL <laurent.pinchart@ideasonboard.com>
+ * Copyright (C) 2010-2011 Ideas on board SPRL
+ *
+ * Contact: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
  *
  * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
+ * it under the terms of the GNU Lesser General Public License as published
+ * by the Free Software Foundation; either version 2.1 of the License, or
  * (at your option) any later version.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
+ * GNU Lesser General Public License for more details.
  *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
  */
 
 #include <sys/ioctl.h>
@@ -23,6 +25,7 @@
 
 #include <errno.h>
 #include <fcntl.h>
+#include <stdbool.h>
 #include <stdio.h>
 #include <string.h>
 #include <unistd.h>
@@ -40,8 +43,9 @@ int v4l2_subdev_open(struct media_entity *entity)
 
        entity->fd = open(entity->devname, O_RDWR);
        if (entity->fd == -1) {
-               printf("%s: Failed to open subdev device node %s\n", __func__,
-                       entity->devname);
+               media_dbg(entity->media,
+                         "%s: Failed to open subdev device node %s\n", __func__,
+                         entity->devname);
                return -errno;
        }
 
@@ -101,48 +105,83 @@ int v4l2_subdev_set_format(struct media_entity *entity,
        return 0;
 }
 
-int v4l2_subdev_get_crop(struct media_entity *entity, struct v4l2_rect *rect,
-                        unsigned int pad, enum v4l2_subdev_format_whence which)
+int v4l2_subdev_get_selection(struct media_entity *entity,
+       struct v4l2_rect *rect, unsigned int pad, unsigned int target,
+       enum v4l2_subdev_format_whence which)
 {
-       struct v4l2_subdev_crop crop;
+       union {
+               struct v4l2_subdev_selection sel;
+               struct v4l2_subdev_crop crop;
+       } u;
        int ret;
 
        ret = v4l2_subdev_open(entity);
        if (ret < 0)
                return ret;
 
-       memset(&crop, 0, sizeof(crop));
-       crop.pad = pad;
-       crop.which = which;
+       memset(&u.sel, 0, sizeof(u.sel));
+       u.sel.pad = pad;
+       u.sel.target = target;
+       u.sel.which = which;
 
-       ret = ioctl(entity->fd, VIDIOC_SUBDEV_G_CROP, &crop);
+       ret = ioctl(entity->fd, VIDIOC_SUBDEV_G_SELECTION, &u.sel);
+       if (ret >= 0) {
+               *rect = u.sel.r;
+               return 0;
+       }
+       if (errno != ENOTTY || target != V4L2_SEL_TGT_CROP)
+               return -errno;
+
+       memset(&u.crop, 0, sizeof(u.crop));
+       u.crop.pad = pad;
+       u.crop.which = which;
+
+       ret = ioctl(entity->fd, VIDIOC_SUBDEV_G_CROP, &u.crop);
        if (ret < 0)
                return -errno;
 
-       *rect = crop.rect;
+       *rect = u.crop.rect;
        return 0;
 }
 
-int v4l2_subdev_set_crop(struct media_entity *entity, struct v4l2_rect *rect,
-                        unsigned int pad, enum v4l2_subdev_format_whence which)
+int v4l2_subdev_set_selection(struct media_entity *entity,
+       struct v4l2_rect *rect, unsigned int pad, unsigned int target,
+       enum v4l2_subdev_format_whence which)
 {
-       struct v4l2_subdev_crop crop;
+       union {
+               struct v4l2_subdev_selection sel;
+               struct v4l2_subdev_crop crop;
+       } u;
        int ret;
 
        ret = v4l2_subdev_open(entity);
        if (ret < 0)
                return ret;
 
-       memset(&crop, 0, sizeof(crop));
-       crop.pad = pad;
-       crop.which = which;
-       crop.rect = *rect;
+       memset(&u.sel, 0, sizeof(u.sel));
+       u.sel.pad = pad;
+       u.sel.target = target;
+       u.sel.which = which;
+       u.sel.r = *rect;
 
-       ret = ioctl(entity->fd, VIDIOC_SUBDEV_S_CROP, &crop);
+       ret = ioctl(entity->fd, VIDIOC_SUBDEV_S_SELECTION, &u.sel);
+       if (ret >= 0) {
+               *rect = u.sel.r;
+               return 0;
+       }
+       if (errno != ENOTTY || target != V4L2_SEL_TGT_CROP)
+               return -errno;
+
+       memset(&u.crop, 0, sizeof(u.crop));
+       u.crop.pad = pad;
+       u.crop.which = which;
+       u.crop.rect = *rect;
+
+       ret = ioctl(entity->fd, VIDIOC_SUBDEV_S_CROP, &u.crop);
        if (ret < 0)
                return -errno;
 
-       *rect = crop.rect;
+       *rect = u.crop.rect;
        return 0;
 }
 
@@ -186,3 +225,413 @@ int v4l2_subdev_set_frame_interval(struct media_entity *entity,
        *interval = ival.interval;
        return 0;
 }
+
+static int v4l2_subdev_parse_format(struct v4l2_mbus_framefmt *format,
+                                   const char *p, char **endp)
+{
+       enum v4l2_mbus_pixelcode code;
+       unsigned int width, height;
+       char *end;
+
+       /*
+        * Compatibility with the old syntax: consider space as valid
+        * separator between the media bus pixel code and the size.
+        */
+       for (; isspace(*p); ++p);
+       for (end = (char *)p;
+            *end != '/' && *end != ' ' && *end != '\0'; ++end);
+
+       code = v4l2_subdev_string_to_pixelcode(p, end - p);
+       if (code == (enum v4l2_mbus_pixelcode)-1)
+               return -EINVAL;
+
+       p = end + 1;
+       width = strtoul(p, &end, 10);
+       if (*end != 'x')
+               return -EINVAL;
+
+       p = end + 1;
+       height = strtoul(p, &end, 10);
+       *endp = end;
+
+       memset(format, 0, sizeof(*format));
+       format->width = width;
+       format->height = height;
+       format->code = code;
+
+       return 0;
+}
+
+static int v4l2_subdev_parse_rectangle(
+       struct v4l2_rect *r, const char *p, char **endp)
+{
+       char *end;
+
+       if (*p++ != '(')
+               return -EINVAL;
+
+       r->left = strtoul(p, &end, 10);
+       if (*end != ',')
+               return -EINVAL;
+
+       p = end + 1;
+       r->top = strtoul(p, &end, 10);
+       if (*end++ != ')')
+               return -EINVAL;
+       if (*end != '/')
+               return -EINVAL;
+
+       p = end + 1;
+       r->width = strtoul(p, &end, 10);
+       if (*end != 'x')
+               return -EINVAL;
+
+       p = end + 1;
+       r->height = strtoul(p, &end, 10);
+       *endp = end;
+
+       return 0;
+}
+
+static int v4l2_subdev_parse_frame_interval(struct v4l2_fract *interval,
+                                           const char *p, char **endp)
+{
+       char *end;
+
+       for (; isspace(*p); ++p);
+
+       interval->numerator = strtoul(p, &end, 10);
+
+       for (p = end; isspace(*p); ++p);
+       if (*p++ != '/')
+               return -EINVAL;
+
+       for (; isspace(*p); ++p);
+       interval->denominator = strtoul(p, &end, 10);
+
+       *endp = end;
+       return 0;
+}
+
+/*
+ * The debate over whether this function should be named icanhasstr() instead
+ * has been strong and heated. If you feel like this would be an important
+ * change, patches are welcome (or not).
+ */
+static bool strhazit(const char *str, const char **p)
+{
+       int len = strlen(str);
+
+       if (strncmp(str, *p, len))
+               return false;
+
+       for (*p += len; isspace(**p); ++*p);
+       return true;
+}
+
+static struct media_pad *v4l2_subdev_parse_pad_format(
+       struct media_device *media, struct v4l2_mbus_framefmt *format,
+       struct v4l2_rect *crop, struct v4l2_rect *compose,
+       struct v4l2_fract *interval, const char *p, char **endp)
+{
+       struct media_pad *pad;
+       bool first;
+       char *end;
+       int ret;
+
+       for (; isspace(*p); ++p);
+
+       pad = media_parse_pad(media, p, &end);
+       if (pad == NULL)
+               return NULL;
+
+       for (p = end; isspace(*p); ++p);
+       if (*p++ != '[')
+               return NULL;
+
+       for (first = true; ; first = false) {
+               for (; isspace(*p); p++);
+
+               /*
+                * Backward compatibility: if the first property starts with an
+                * uppercase later, process it as a format description.
+                */
+               if (strhazit("fmt:", &p) || (first && isupper(*p))) {
+                       ret = v4l2_subdev_parse_format(format, p, &end);
+                       if (ret < 0)
+                               return NULL;
+
+                       p = end;
+                       continue;
+               }
+
+               /*
+                * Backward compatibility: crop rectangles can be specified
+                * implicitly without the 'crop:' property name.
+                */
+               if (strhazit("crop:", &p) || *p == '(') {
+                       ret = v4l2_subdev_parse_rectangle(crop, p, &end);
+                       if (ret < 0)
+                               return NULL;
+
+                       p = end;
+                       continue;
+               }
+
+               if (strhazit("compose:", &p)) {
+                       ret = v4l2_subdev_parse_rectangle(compose, p, &end);
+                       if (ret < 0)
+                               return NULL;
+
+                       for (p = end; isspace(*p); p++);
+                       continue;
+               }
+
+               if (*p == '@') {
+                       ret = v4l2_subdev_parse_frame_interval(interval, ++p, &end);
+                       if (ret < 0)
+                               return NULL;
+
+                       p = end;
+                       continue;
+               }
+
+               break;
+       }
+
+       if (*p != ']')
+               return NULL;
+
+       *endp = (char *)p + 1;
+       return pad;
+}
+
+static int set_format(struct media_pad *pad,
+                     struct v4l2_mbus_framefmt *format)
+{
+       int ret;
+
+       if (format->width == 0 || format->height == 0)
+               return 0;
+
+       media_dbg(pad->entity->media,
+                 "Setting up format %s %ux%u on pad %s/%u\n",
+                 v4l2_subdev_pixelcode_to_string(format->code),
+                 format->width, format->height,
+                 pad->entity->info.name, pad->index);
+
+       ret = v4l2_subdev_set_format(pad->entity, format, pad->index,
+                                    V4L2_SUBDEV_FORMAT_ACTIVE);
+       if (ret < 0) {
+               media_dbg(pad->entity->media,
+                         "Unable to set format: %s (%d)\n",
+                         strerror(-ret), ret);
+               return ret;
+       }
+
+       media_dbg(pad->entity->media,
+                 "Format set: %s %ux%u\n",
+                 v4l2_subdev_pixelcode_to_string(format->code),
+                 format->width, format->height);
+
+       return 0;
+}
+
+static int set_selection(struct media_pad *pad, unsigned int target,
+                        struct v4l2_rect *rect)
+{
+       int ret;
+
+       if (rect->left == -1 || rect->top == -1)
+               return 0;
+
+       media_dbg(pad->entity->media,
+                 "Setting up selection target %u rectangle (%u,%u)/%ux%u on pad %s/%u\n",
+                 target, rect->left, rect->top, rect->width, rect->height,
+                 pad->entity->info.name, pad->index);
+
+       ret = v4l2_subdev_set_selection(pad->entity, rect, pad->index,
+                                       target, V4L2_SUBDEV_FORMAT_ACTIVE);
+       if (ret < 0) {
+               media_dbg(pad->entity->media,
+                         "Unable to set selection rectangle: %s (%d)\n",
+                         strerror(-ret), ret);
+               return ret;
+       }
+
+       media_dbg(pad->entity->media,
+                 "Selection rectangle set: (%u,%u)/%ux%u\n",
+                 rect->left, rect->top, rect->width, rect->height);
+
+       return 0;
+}
+
+static int set_frame_interval(struct media_entity *entity,
+                             struct v4l2_fract *interval)
+{
+       int ret;
+
+       if (interval->numerator == 0)
+               return 0;
+
+       media_dbg(entity->media,
+                 "Setting up frame interval %u/%u on entity %s\n",
+                 interval->numerator, interval->denominator,
+                 entity->info.name);
+
+       ret = v4l2_subdev_set_frame_interval(entity, interval);
+       if (ret < 0) {
+               media_dbg(entity->media,
+                         "Unable to set frame interval: %s (%d)",
+                         strerror(-ret), ret);
+               return ret;
+       }
+
+       media_dbg(entity->media, "Frame interval set: %u/%u\n",
+                 interval->numerator, interval->denominator);
+
+       return 0;
+}
+
+
+static int v4l2_subdev_parse_setup_format(struct media_device *media,
+                                         const char *p, char **endp)
+{
+       struct v4l2_mbus_framefmt format = { 0, 0, 0 };
+       struct media_pad *pad;
+       struct v4l2_rect crop = { -1, -1, -1, -1 };
+       struct v4l2_rect compose = crop;
+       struct v4l2_fract interval = { 0, 0 };
+       unsigned int i;
+       char *end;
+       int ret;
+
+       pad = v4l2_subdev_parse_pad_format(media, &format, &crop, &compose,
+                                          &interval, p, &end);
+       if (pad == NULL) {
+               media_dbg(media, "Unable to parse format\n");
+               return -EINVAL;
+       }
+
+       if (pad->flags & MEDIA_PAD_FL_SINK) {
+               ret = set_format(pad, &format);
+               if (ret < 0)
+                       return ret;
+       }
+
+       ret = set_selection(pad, V4L2_SEL_TGT_CROP, &crop);
+       if (ret < 0)
+               return ret;
+
+       ret = set_selection(pad, V4L2_SEL_TGT_COMPOSE, &compose);
+       if (ret < 0)
+               return ret;
+
+       if (pad->flags & MEDIA_PAD_FL_SOURCE) {
+               ret = set_format(pad, &format);
+               if (ret < 0)
+                       return ret;
+       }
+
+       ret = set_frame_interval(pad->entity, &interval);
+       if (ret < 0)
+               return ret;
+
+
+       /* If the pad is an output pad, automatically set the same format on
+        * the remote subdev input pads, if any.
+        */
+       if (pad->flags & MEDIA_PAD_FL_SOURCE) {
+               for (i = 0; i < pad->entity->num_links; ++i) {
+                       struct media_link *link = &pad->entity->links[i];
+                       struct v4l2_mbus_framefmt remote_format;
+
+                       if (!(link->flags & MEDIA_LNK_FL_ENABLED))
+                               continue;
+
+                       if (link->source == pad &&
+                           link->sink->entity->info.type == MEDIA_ENT_T_V4L2_SUBDEV) {
+                               remote_format = format;
+                               set_format(link->sink, &remote_format);
+                       }
+               }
+       }
+
+       *endp = end;
+       return 0;
+}
+
+int v4l2_subdev_parse_setup_formats(struct media_device *media, const char *p)
+{
+       char *end;
+       int ret;
+
+       do {
+               ret = v4l2_subdev_parse_setup_format(media, p, &end);
+               if (ret < 0)
+                       return ret;
+
+               p = end + 1;
+       } while (*end == ',');
+
+       return *end ? -EINVAL : 0;
+}
+
+static struct {
+       const char *name;
+       enum v4l2_mbus_pixelcode code;
+} mbus_formats[] = {
+       { "Y8", V4L2_MBUS_FMT_Y8_1X8},
+       { "Y10", V4L2_MBUS_FMT_Y10_1X10 },
+       { "Y12", V4L2_MBUS_FMT_Y12_1X12 },
+       { "YUYV", V4L2_MBUS_FMT_YUYV8_1X16 },
+       { "YUYV1_5X8", V4L2_MBUS_FMT_YUYV8_1_5X8 },
+       { "YUYV2X8", V4L2_MBUS_FMT_YUYV8_2X8 },
+       { "UYVY", V4L2_MBUS_FMT_UYVY8_1X16 },
+       { "UYVY1_5X8", V4L2_MBUS_FMT_UYVY8_1_5X8 },
+       { "UYVY2X8", V4L2_MBUS_FMT_UYVY8_2X8 },
+       { "SBGGR8", V4L2_MBUS_FMT_SBGGR8_1X8 },
+       { "SGBRG8", V4L2_MBUS_FMT_SGBRG8_1X8 },
+       { "SGRBG8", V4L2_MBUS_FMT_SGRBG8_1X8 },
+       { "SRGGB8", V4L2_MBUS_FMT_SRGGB8_1X8 },
+       { "SBGGR10", V4L2_MBUS_FMT_SBGGR10_1X10 },
+       { "SGBRG10", V4L2_MBUS_FMT_SGBRG10_1X10 },
+       { "SGRBG10", V4L2_MBUS_FMT_SGRBG10_1X10 },
+       { "SRGGB10", V4L2_MBUS_FMT_SRGGB10_1X10 },
+       { "SBGGR10_DPCM8", V4L2_MBUS_FMT_SBGGR10_DPCM8_1X8 },
+       { "SGBRG10_DPCM8", V4L2_MBUS_FMT_SGBRG10_DPCM8_1X8 },
+       { "SGRBG10_DPCM8", V4L2_MBUS_FMT_SGRBG10_DPCM8_1X8 },
+       { "SRGGB10_DPCM8", V4L2_MBUS_FMT_SRGGB10_DPCM8_1X8 },
+       { "SBGGR12", V4L2_MBUS_FMT_SBGGR12_1X12 },
+       { "SGBRG12", V4L2_MBUS_FMT_SGBRG12_1X12 },
+       { "SGRBG12", V4L2_MBUS_FMT_SGRBG12_1X12 },
+       { "SRGGB12", V4L2_MBUS_FMT_SRGGB12_1X12 },
+};
+
+const char *v4l2_subdev_pixelcode_to_string(enum v4l2_mbus_pixelcode code)
+{
+       unsigned int i;
+
+       for (i = 0; i < ARRAY_SIZE(mbus_formats); ++i) {
+               if (mbus_formats[i].code == code)
+                       return mbus_formats[i].name;
+       }
+
+       return "unknown";
+}
+
+enum v4l2_mbus_pixelcode v4l2_subdev_string_to_pixelcode(const char *string,
+                                                        unsigned int length)
+{
+       unsigned int i;
+
+       for (i = 0; i < ARRAY_SIZE(mbus_formats); ++i) {
+               if (strncmp(mbus_formats[i].name, string, length) == 0)
+                       break;
+       }
+
+       if (i == ARRAY_SIZE(mbus_formats))
+               return (enum v4l2_mbus_pixelcode)-1;
+
+       return mbus_formats[i].code;
+}