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gstreamer/sys/v4l2/gstv4l2object.c
Havoc Pennington f06b105058 v4l2src: do not try to change device format if it's already correct 
This allows set_caps to succeed if caps change in a way that
would not modify the format we're getting from the hardware.
Otherwise if not in NULL state, setting caps would fail
with EBUSY.

With this change, in some cases it's OK to go PLAYING->READY->PLAYING
rather than PLAYING->NULL->PLAYING to avoid a time-consuming close
and reopen of the device.

Fixes #621723
2010-06-16 17:48:47 +02:00

1985 lines
57 KiB
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/* GStreamer
*
* Copyright (C) 2001-2002 Ronald Bultje <rbultje@ronald.bitfreak.net>
* 2006 Edgard Lima <edgard.lima@indt.org.br>
*
* gstv4l2object.c: base class for V4L2 elements
*
* This library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Library General Public License as published
* by the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version. This library 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 Library General Public License for more details.
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
* USA.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <unistd.h>
#include <string.h>
#ifdef HAVE_GUDEV
#include <gudev/gudev.h>
#endif
#include "v4l2_calls.h"
#include "gstv4l2tuner.h"
#if 0 /* overlay is still not implemented #ifdef HAVE_XVIDEO */
#include "gstv4l2xoverlay.h"
#endif
#include "gstv4l2colorbalance.h"
#include "gst/gst-i18n-plugin.h"
GST_DEBUG_CATEGORY_EXTERN (v4l2_debug);
#define GST_CAT_DEFAULT v4l2_debug
#define DEFAULT_PROP_DEVICE_NAME NULL
#define DEFAULT_PROP_DEVICE_FD -1
#define DEFAULT_PROP_FLAGS 0
#define DEFAULT_PROP_NORM NULL
#define DEFAULT_PROP_CHANNEL NULL
#define DEFAULT_PROP_FREQUENCY 0
enum
{
PROP_0,
V4L2_STD_OBJECT_PROPS,
};
const GList *
gst_v4l2_probe_get_properties (GstPropertyProbe * probe)
{
GObjectClass *klass = G_OBJECT_GET_CLASS (probe);
static GList *list = NULL;
/* well, not perfect, but better than no locking at all.
* In the worst case we leak a list node, so who cares? */
GST_CLASS_LOCK (GST_OBJECT_CLASS (klass));
if (!list) {
list = g_list_append (NULL, g_object_class_find_property (klass, "device"));
}
GST_CLASS_UNLOCK (GST_OBJECT_CLASS (klass));
return list;
}
static gboolean init = FALSE;
static GList *devices = NULL;
#ifdef HAVE_GUDEV
static gboolean
gst_v4l2_class_probe_devices_with_udev (GstElementClass * klass, gboolean check,
GList ** klass_devices)
{
GUdevClient *client = NULL;
GList *item;
if (!check) {
while (devices) {
gchar *device = devices->data;
devices = g_list_remove (devices, device);
g_free (device);
}
GST_INFO ("Enumerating video4linux devices from udev");
client = g_udev_client_new (NULL);
if (!client) {
GST_WARNING ("Failed to initialize gudev client");
goto finish;
}
item = g_udev_client_query_by_subsystem (client, "video4linux");
while (item) {
GUdevDevice *device = item->data;
gchar *devnode = g_strdup (g_udev_device_get_device_file (device));
gint api = g_udev_device_get_property_as_int (device, "ID_V4L_VERSION");
GST_INFO ("Found new device: %s, API: %d", devnode, api);
/* Append v4l2 devices only. If api is 0 probably v4l_id has
been stripped out of the current udev installation, append
anyway */
if (api == 0) {
GST_WARNING
("Couldn't retrieve ID_V4L_VERSION, silly udev installation?");
}
if ((api == 2 || api == 0)) {
devices = g_list_append (devices, devnode);
} else {
g_free (devnode);
}
g_object_unref (device);
item = item->next;
}
g_list_free (item);
init = TRUE;
}
finish:
if (client) {
g_object_unref (client);
}
*klass_devices = devices;
return init;
}
#endif /* HAVE_GUDEV */
static gboolean
gst_v4l2_class_probe_devices (GstElementClass * klass, gboolean check,
GList ** klass_devices)
{
if (!check) {
const gchar *dev_base[] = { "/dev/video", "/dev/v4l2/video", NULL };
gint base, n, fd;
while (devices) {
gchar *device = devices->data;
devices = g_list_remove (devices, device);
g_free (device);
}
/*
* detect /dev entries
*/
for (n = 0; n < 64; n++) {
for (base = 0; dev_base[base] != NULL; base++) {
struct stat s;
gchar *device = g_strdup_printf ("%s%d",
dev_base[base],
n);
/*
* does the /dev/ entry exist at all?
*/
if (stat (device, &s) == 0) {
/*
* yes: is a device attached?
*/
if (S_ISCHR (s.st_mode)) {
if ((fd = open (device, O_RDWR | O_NONBLOCK)) > 0 || errno == EBUSY) {
if (fd > 0)
close (fd);
devices = g_list_append (devices, device);
break;
}
}
}
g_free (device);
}
}
init = TRUE;
}
*klass_devices = devices;
return init;
}
void
gst_v4l2_probe_probe_property (GstPropertyProbe * probe,
guint prop_id, const GParamSpec * pspec, GList ** klass_devices)
{
GstElementClass *klass = GST_ELEMENT_GET_CLASS (probe);
switch (prop_id) {
case PROP_DEVICE:
#ifdef HAVE_GUDEV
if (!gst_v4l2_class_probe_devices_with_udev (klass, FALSE, klass_devices))
gst_v4l2_class_probe_devices (klass, FALSE, klass_devices);
#else /* !HAVE_GUDEV */
gst_v4l2_class_probe_devices (klass, FALSE, klass_devices);
#endif /* HAVE_GUDEV */
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (probe, prop_id, pspec);
break;
}
}
gboolean
gst_v4l2_probe_needs_probe (GstPropertyProbe * probe,
guint prop_id, const GParamSpec * pspec, GList ** klass_devices)
{
GstElementClass *klass = GST_ELEMENT_GET_CLASS (probe);
gboolean ret = FALSE;
switch (prop_id) {
case PROP_DEVICE:
#ifdef HAVE_GUDEV
ret =
!gst_v4l2_class_probe_devices_with_udev (klass, FALSE, klass_devices);
#else /* !HAVE_GUDEV */
ret = !gst_v4l2_class_probe_devices (klass, TRUE, klass_devices);
#endif /* HAVE_GUDEV */
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (probe, prop_id, pspec);
break;
}
return ret;
}
static GValueArray *
gst_v4l2_class_list_devices (GstElementClass * klass, GList ** klass_devices)
{
GValueArray *array;
GValue value = { 0 };
GList *item;
if (!*klass_devices)
return NULL;
array = g_value_array_new (g_list_length (*klass_devices));
item = *klass_devices;
g_value_init (&value, G_TYPE_STRING);
while (item) {
gchar *device = item->data;
g_value_set_string (&value, device);
g_value_array_append (array, &value);
item = item->next;
}
g_value_unset (&value);
return array;
}
GValueArray *
gst_v4l2_probe_get_values (GstPropertyProbe * probe,
guint prop_id, const GParamSpec * pspec, GList ** klass_devices)
{
GstElementClass *klass = GST_ELEMENT_GET_CLASS (probe);
GValueArray *array = NULL;
switch (prop_id) {
case PROP_DEVICE:
array = gst_v4l2_class_list_devices (klass, klass_devices);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (probe, prop_id, pspec);
break;
}
return array;
}
#define GST_TYPE_V4L2_DEVICE_FLAGS (gst_v4l2_device_get_type ())
static GType
gst_v4l2_device_get_type (void)
{
static GType v4l2_device_type = 0;
if (v4l2_device_type == 0) {
static const GFlagsValue values[] = {
{V4L2_CAP_VIDEO_CAPTURE, "Device supports video capture", "capture"},
{V4L2_CAP_VIDEO_OUTPUT, "Device supports video playback", "output"},
{V4L2_CAP_VIDEO_OVERLAY, "Device supports video overlay", "overlay"},
{V4L2_CAP_VBI_CAPTURE, "Device supports the VBI capture", "vbi-capture"},
{V4L2_CAP_VBI_OUTPUT, "Device supports the VBI output", "vbi-output"},
{V4L2_CAP_TUNER, "Device has a tuner or modulator", "tuner"},
{V4L2_CAP_AUDIO, "Device has audio inputs or outputs", "audio"},
{0, NULL, NULL}
};
v4l2_device_type =
g_flags_register_static ("GstV4l2DeviceTypeFlags", values);
}
return v4l2_device_type;
}
void
gst_v4l2_object_install_properties_helper (GObjectClass * gobject_class,
const char *default_device)
{
g_object_class_install_property (gobject_class, PROP_DEVICE,
g_param_spec_string ("device", "Device", "Device location",
default_device, G_PARAM_READWRITE));
g_object_class_install_property (gobject_class, PROP_DEVICE_NAME,
g_param_spec_string ("device-name", "Device name",
"Name of the device", DEFAULT_PROP_DEVICE_NAME, G_PARAM_READABLE));
g_object_class_install_property (gobject_class, PROP_DEVICE_FD,
g_param_spec_int ("device-fd", "File descriptor",
"File descriptor of the device", -1, G_MAXINT, DEFAULT_PROP_DEVICE_FD,
G_PARAM_READABLE));
g_object_class_install_property (gobject_class, PROP_FLAGS,
g_param_spec_flags ("flags", "Flags", "Device type flags",
GST_TYPE_V4L2_DEVICE_FLAGS, DEFAULT_PROP_FLAGS, G_PARAM_READABLE));
}
GstV4l2Object *
gst_v4l2_object_new (GstElement * element,
enum v4l2_buf_type type,
const char *default_device,
GstV4l2GetInOutFunction get_in_out_func,
GstV4l2SetInOutFunction set_in_out_func,
GstV4l2UpdateFpsFunction update_fps_func)
{
GstV4l2Object *v4l2object;
/*
* some default values
*/
v4l2object = g_new0 (GstV4l2Object, 1);
v4l2object->type = type;
v4l2object->formats = NULL;
v4l2object->element = element;
v4l2object->get_in_out_func = get_in_out_func;
v4l2object->set_in_out_func = set_in_out_func;
v4l2object->update_fps_func = update_fps_func;
v4l2object->video_fd = -1;
v4l2object->poll = gst_poll_new (TRUE);
v4l2object->buffer = NULL;
v4l2object->videodev = g_strdup (default_device);
v4l2object->norms = NULL;
v4l2object->channels = NULL;
v4l2object->colors = NULL;
v4l2object->xwindow_id = 0;
return v4l2object;
}
static gboolean gst_v4l2_object_clear_format_list (GstV4l2Object * v4l2object);
void
gst_v4l2_object_destroy (GstV4l2Object * v4l2object)
{
g_return_if_fail (v4l2object != NULL);
if (v4l2object->videodev)
g_free (v4l2object->videodev);
if (v4l2object->poll)
gst_poll_free (v4l2object->poll);
if (v4l2object->channel)
g_free (v4l2object->channel);
if (v4l2object->norm)
g_free (v4l2object->norm);
if (v4l2object->formats) {
gst_v4l2_object_clear_format_list (v4l2object);
}
g_free (v4l2object);
}
static gboolean
gst_v4l2_object_clear_format_list (GstV4l2Object * v4l2object)
{
g_slist_foreach (v4l2object->formats, (GFunc) g_free, NULL);
g_slist_free (v4l2object->formats);
v4l2object->formats = NULL;
return TRUE;
}
gboolean
gst_v4l2_object_set_property_helper (GstV4l2Object * v4l2object,
guint prop_id, const GValue * value, GParamSpec * pspec)
{
switch (prop_id) {
case PROP_DEVICE:
g_free (v4l2object->videodev);
v4l2object->videodev = g_value_dup_string (value);
break;
#if 0
case PROP_NORM:
if (GST_V4L2_IS_OPEN (v4l2object)) {
GstTuner *tuner = GST_TUNER (v4l2object->element);
GstTunerNorm *norm = gst_tuner_find_norm_by_name (tuner,
(gchar *) g_value_get_string (value));
if (norm) {
/* like gst_tuner_set_norm (tuner, norm)
without g_object_notify */
gst_v4l2_tuner_set_norm (v4l2object, norm);
}
} else {
g_free (v4l2object->norm);
v4l2object->norm = g_value_dup_string (value);
}
break;
case PROP_CHANNEL:
if (GST_V4L2_IS_OPEN (v4l2object)) {
GstTuner *tuner = GST_TUNER (v4l2object->element);
GstTunerChannel *channel = gst_tuner_find_channel_by_name (tuner,
(gchar *) g_value_get_string (value));
if (channel) {
/* like gst_tuner_set_channel (tuner, channel)
without g_object_notify */
gst_v4l2_tuner_set_channel (v4l2object, channel);
}
} else {
g_free (v4l2object->channel);
v4l2object->channel = g_value_dup_string (value);
}
break;
case PROP_FREQUENCY:
if (GST_V4L2_IS_OPEN (v4l2object)) {
GstTuner *tuner = GST_TUNER (v4l2object->element);
GstTunerChannel *channel = gst_tuner_get_channel (tuner);
if (channel &&
GST_TUNER_CHANNEL_HAS_FLAG (channel, GST_TUNER_CHANNEL_FREQUENCY)) {
/* like
gst_tuner_set_frequency (tuner, channel, g_value_get_ulong (value))
without g_object_notify */
gst_v4l2_tuner_set_frequency (v4l2object, channel,
g_value_get_ulong (value));
}
} else {
v4l2object->frequency = g_value_get_ulong (value);
}
break;
#endif
default:
return FALSE;
break;
}
return TRUE;
}
gboolean
gst_v4l2_object_get_property_helper (GstV4l2Object * v4l2object,
guint prop_id, GValue * value, GParamSpec * pspec)
{
switch (prop_id) {
case PROP_DEVICE:
g_value_set_string (value, v4l2object->videodev);
break;
case PROP_DEVICE_NAME:
{
const guchar *new = NULL;
if (GST_V4L2_IS_OPEN (v4l2object)) {
new = v4l2object->vcap.card;
} else if (gst_v4l2_open (v4l2object)) {
new = v4l2object->vcap.card;
gst_v4l2_close (v4l2object);
}
g_value_set_string (value, (gchar *) new);
break;
}
case PROP_DEVICE_FD:
{
if (GST_V4L2_IS_OPEN (v4l2object))
g_value_set_int (value, v4l2object->video_fd);
else
g_value_set_int (value, DEFAULT_PROP_DEVICE_FD);
break;
}
case PROP_FLAGS:
{
guint flags = 0;
if (GST_V4L2_IS_OPEN (v4l2object)) {
flags |= v4l2object->vcap.capabilities &
(V4L2_CAP_VIDEO_CAPTURE |
V4L2_CAP_VIDEO_OUTPUT |
V4L2_CAP_VIDEO_OVERLAY |
V4L2_CAP_VBI_CAPTURE |
V4L2_CAP_VBI_OUTPUT | V4L2_CAP_TUNER | V4L2_CAP_AUDIO);
}
g_value_set_flags (value, flags);
break;
}
default:
return FALSE;
break;
}
return TRUE;
}
static void
gst_v4l2_set_defaults (GstV4l2Object * v4l2object)
{
GstTunerNorm *norm = NULL;
GstTunerChannel *channel = NULL;
GstTuner *tuner;
if (!GST_IS_TUNER (v4l2object->element))
return;
tuner = GST_TUNER (v4l2object->element);
if (v4l2object->norm)
norm = gst_tuner_find_norm_by_name (tuner, v4l2object->norm);
if (norm) {
gst_tuner_set_norm (tuner, norm);
} else {
norm =
GST_TUNER_NORM (gst_tuner_get_norm (GST_TUNER (v4l2object->element)));
if (norm) {
g_free (v4l2object->norm);
v4l2object->norm = g_strdup (norm->label);
gst_tuner_norm_changed (tuner, norm);
}
}
if (v4l2object->channel)
channel = gst_tuner_find_channel_by_name (tuner, v4l2object->channel);
if (channel) {
gst_tuner_set_channel (tuner, channel);
} else {
channel =
GST_TUNER_CHANNEL (gst_tuner_get_channel (GST_TUNER
(v4l2object->element)));
if (channel) {
g_free (v4l2object->channel);
v4l2object->channel = g_strdup (channel->label);
gst_tuner_channel_changed (tuner, channel);
}
}
if (channel
&& GST_TUNER_CHANNEL_HAS_FLAG (channel, GST_TUNER_CHANNEL_FREQUENCY)) {
if (v4l2object->frequency != 0) {
gst_tuner_set_frequency (tuner, channel, v4l2object->frequency);
} else {
v4l2object->frequency = gst_tuner_get_frequency (tuner, channel);
if (v4l2object->frequency == 0) {
/* guess */
gst_tuner_set_frequency (tuner, channel, 1000);
} else {
}
}
}
}
gboolean
gst_v4l2_object_start (GstV4l2Object * v4l2object)
{
if (gst_v4l2_open (v4l2object))
gst_v4l2_set_defaults (v4l2object);
else
return FALSE;
#if 0 /* overlay is still not implemented #ifdef HAVE_XVIDEO */
gst_v4l2_xoverlay_start (v4l2object);
#endif
return TRUE;
}
gboolean
gst_v4l2_object_stop (GstV4l2Object * v4l2object)
{
#if 0 /* overlay is still not implemented #ifdef HAVE_XVIDEO */
gst_v4l2_xoverlay_stop (v4l2object);
#endif
if (!gst_v4l2_close (v4l2object))
return FALSE;
if (v4l2object->formats) {
gst_v4l2_object_clear_format_list (v4l2object);
}
return TRUE;
}
/*
* common format / caps utilities:
*/
typedef struct
{
guint32 format;
gboolean dimensions;
} GstV4L2FormatDesc;
static const GstV4L2FormatDesc gst_v4l2_formats[] = {
/* from Linux 2.6.15 videodev2.h */
{V4L2_PIX_FMT_RGB332, TRUE},
{V4L2_PIX_FMT_RGB555, TRUE},
{V4L2_PIX_FMT_RGB565, TRUE},
{V4L2_PIX_FMT_RGB555X, TRUE},
{V4L2_PIX_FMT_RGB565X, TRUE},
{V4L2_PIX_FMT_BGR24, TRUE},
{V4L2_PIX_FMT_RGB24, TRUE},
{V4L2_PIX_FMT_BGR32, TRUE},
{V4L2_PIX_FMT_RGB32, TRUE},
{V4L2_PIX_FMT_GREY, TRUE},
{V4L2_PIX_FMT_YVU410, TRUE},
{V4L2_PIX_FMT_YVU420, TRUE},
{V4L2_PIX_FMT_YUYV, TRUE},
{V4L2_PIX_FMT_UYVY, TRUE},
{V4L2_PIX_FMT_YUV422P, TRUE},
{V4L2_PIX_FMT_YUV411P, TRUE},
{V4L2_PIX_FMT_Y41P, TRUE},
/* two planes -- one Y, one Cr + Cb interleaved */
{V4L2_PIX_FMT_NV12, TRUE},
{V4L2_PIX_FMT_NV21, TRUE},
/* The following formats are not defined in the V4L2 specification */
{V4L2_PIX_FMT_YUV410, TRUE},
{V4L2_PIX_FMT_YUV420, TRUE},
{V4L2_PIX_FMT_YYUV, TRUE},
{V4L2_PIX_FMT_HI240, TRUE},
/* see http://www.siliconimaging.com/RGB%20Bayer.htm */
#ifdef V4L2_PIX_FMT_SBGGR8
{V4L2_PIX_FMT_SBGGR8, TRUE},
#endif
/* compressed formats */
{V4L2_PIX_FMT_MJPEG, TRUE},
{V4L2_PIX_FMT_JPEG, TRUE},
{V4L2_PIX_FMT_DV, TRUE},
{V4L2_PIX_FMT_MPEG, FALSE},
/* Vendor-specific formats */
{V4L2_PIX_FMT_WNVA, TRUE},
#ifdef V4L2_PIX_FMT_SN9C10X
{V4L2_PIX_FMT_SN9C10X, TRUE},
#endif
#ifdef V4L2_PIX_FMT_PWC1
{V4L2_PIX_FMT_PWC1, TRUE},
#endif
#ifdef V4L2_PIX_FMT_PWC2
{V4L2_PIX_FMT_PWC2, TRUE},
#endif
#ifdef V4L2_PIX_FMT_YVYU
{V4L2_PIX_FMT_YVYU, TRUE},
#endif
};
#define GST_V4L2_FORMAT_COUNT (G_N_ELEMENTS (gst_v4l2_formats))
static struct v4l2_fmtdesc *
gst_v4l2_object_get_format_from_fourcc (GstV4l2Object * v4l2object,
guint32 fourcc)
{
struct v4l2_fmtdesc *fmt;
GSList *walk;
if (fourcc == 0)
return NULL;
walk = gst_v4l2_object_get_format_list (v4l2object);
while (walk) {
fmt = (struct v4l2_fmtdesc *) walk->data;
if (fmt->pixelformat == fourcc)
return fmt;
/* special case for jpeg */
if ((fmt->pixelformat == V4L2_PIX_FMT_MJPEG && fourcc == V4L2_PIX_FMT_JPEG)
|| (fmt->pixelformat == V4L2_PIX_FMT_JPEG
&& fourcc == V4L2_PIX_FMT_MJPEG)) {
return fmt;
}
walk = g_slist_next (walk);
}
return NULL;
}
/* complete made up ranking, the values themselves are meaningless */
#define YUV_BASE_RANK 1000
#define JPEG_BASE_RANK 500
#define DV_BASE_RANK 200
#define RGB_BASE_RANK 100
#define YUV_ODD_BASE_RANK 50
#define RGB_ODD_BASE_RANK 25
#define BAYER_BASE_RANK 15
#define S910_BASE_RANK 10
#define GREY_BASE_RANK 5
#define PWC_BASE_RANK 1
/* This flag is already used by libv4l2 although
* it was added to the Linux kernel in 2.6.32
*/
#ifndef V4L2_FMT_FLAG_EMULATED
#define V4L2_FMT_FLAG_EMULATED 0x0002
#endif
static gint
gst_v4l2_object_format_get_rank (const struct v4l2_fmtdesc *fmt)
{
guint32 fourcc = fmt->pixelformat;
gboolean emulated = ((fmt->flags & V4L2_FMT_FLAG_EMULATED) != 0);
gint rank = 0;
switch (fourcc) {
case V4L2_PIX_FMT_MJPEG:
rank = JPEG_BASE_RANK;
break;
case V4L2_PIX_FMT_JPEG:
rank = JPEG_BASE_RANK + 1;
break;
case V4L2_PIX_FMT_MPEG: /* MPEG */
rank = JPEG_BASE_RANK + 2;
break;
case V4L2_PIX_FMT_RGB332:
case V4L2_PIX_FMT_RGB555:
case V4L2_PIX_FMT_RGB555X:
case V4L2_PIX_FMT_RGB565:
case V4L2_PIX_FMT_RGB565X:
rank = RGB_ODD_BASE_RANK;
break;
case V4L2_PIX_FMT_RGB24:
case V4L2_PIX_FMT_BGR24:
rank = RGB_BASE_RANK - 1;
break;
case V4L2_PIX_FMT_RGB32:
case V4L2_PIX_FMT_BGR32:
rank = RGB_BASE_RANK;
break;
case V4L2_PIX_FMT_GREY: /* 8 Greyscale */
rank = GREY_BASE_RANK;
break;
case V4L2_PIX_FMT_NV12: /* 12 Y/CbCr 4:2:0 */
case V4L2_PIX_FMT_NV21: /* 12 Y/CrCb 4:2:0 */
case V4L2_PIX_FMT_YYUV: /* 16 YUV 4:2:2 */
case V4L2_PIX_FMT_HI240: /* 8 8-bit color */
rank = YUV_ODD_BASE_RANK;
break;
case V4L2_PIX_FMT_YVU410: /* YVU9, 9 bits per pixel */
rank = YUV_BASE_RANK + 3;
break;
case V4L2_PIX_FMT_YUV410: /* YUV9, 9 bits per pixel */
rank = YUV_BASE_RANK + 2;
break;
case V4L2_PIX_FMT_YUV420: /* I420, 12 bits per pixel */
rank = YUV_BASE_RANK + 7;
break;
case V4L2_PIX_FMT_YUYV: /* YUY2, 16 bits per pixel */
rank = YUV_BASE_RANK + 10;
break;
case V4L2_PIX_FMT_YVU420: /* YV12, 12 bits per pixel */
rank = YUV_BASE_RANK + 6;
break;
case V4L2_PIX_FMT_UYVY: /* UYVY, 16 bits per pixel */
rank = YUV_BASE_RANK + 9;
break;
case V4L2_PIX_FMT_Y41P: /* Y41P, 12 bits per pixel */
rank = YUV_BASE_RANK + 5;
break;
case V4L2_PIX_FMT_YUV411P: /* Y41B, 12 bits per pixel */
rank = YUV_BASE_RANK + 4;
break;
case V4L2_PIX_FMT_YUV422P: /* Y42B, 16 bits per pixel */
rank = YUV_BASE_RANK + 8;
break;
case V4L2_PIX_FMT_DV:
rank = DV_BASE_RANK;
break;
case V4L2_PIX_FMT_WNVA: /* Winnov hw compres */
rank = 0;
break;
#ifdef V4L2_PIX_FMT_SBGGR8
case V4L2_PIX_FMT_SBGGR8:
rank = BAYER_BASE_RANK;
break;
#endif
#ifdef V4L2_PIX_FMT_SN9C10X
case V4L2_PIX_FMT_SN9C10X:
rank = S910_BASE_RANK;
break;
#endif
#ifdef V4L2_PIX_FMT_PWC1
case V4L2_PIX_FMT_PWC1:
rank = PWC_BASE_RANK;
break;
#endif
#ifdef V4L2_PIX_FMT_PWC2
case V4L2_PIX_FMT_PWC2:
rank = PWC_BASE_RANK;
break;
#endif
default:
rank = 0;
break;
}
/* All ranks are below 1<<15 so a shift by 15
* will a) make all non-emulated formats larger
* than emulated and b) will not overflow
*/
if (!emulated)
rank <<= 15;
return rank;
}
static gint
format_cmp_func (gconstpointer a, gconstpointer b)
{
const struct v4l2_fmtdesc *fa = a;
const struct v4l2_fmtdesc *fb = b;
if (fa->pixelformat == fb->pixelformat)
return 0;
return gst_v4l2_object_format_get_rank (fa) -
gst_v4l2_object_format_get_rank (fb);
}
/******************************************************
* gst_v4l2_object_fill_format_list():
* create list of supported capture formats
* return value: TRUE on success, FALSE on error
******************************************************/
static gboolean
gst_v4l2_object_fill_format_list (GstV4l2Object * v4l2object)
{
gint n;
struct v4l2_fmtdesc *format;
GST_DEBUG_OBJECT (v4l2object->element, "getting src format enumerations");
/* format enumeration */
for (n = 0;; n++) {
format = g_new0 (struct v4l2_fmtdesc, 1);
format->index = n;
format->type = v4l2object->type;
if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_ENUM_FMT, format) < 0) {
if (errno == EINVAL) {
g_free (format);
break; /* end of enumeration */
} else {
goto failed;
}
}
GST_LOG_OBJECT (v4l2object->element, "index: %u", format->index);
GST_LOG_OBJECT (v4l2object->element, "type: %d", format->type);
GST_LOG_OBJECT (v4l2object->element, "flags: %08x", format->flags);
GST_LOG_OBJECT (v4l2object->element, "description: '%s'",
format->description);
GST_LOG_OBJECT (v4l2object->element, "pixelformat: %" GST_FOURCC_FORMAT,
GST_FOURCC_ARGS (format->pixelformat));
/* sort formats according to our preference; we do this, because caps
* are probed in the order the formats are in the list, and the order of
* formats in the final probed caps matters for things like fixation */
v4l2object->formats = g_slist_insert_sorted (v4l2object->formats, format,
(GCompareFunc) format_cmp_func);
}
GST_DEBUG_OBJECT (v4l2object->element, "got %d format(s)", n);
return TRUE;
/* ERRORS */
failed:
{
GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, SETTINGS,
(_("Failed to enumerate possible video formats device '%s' can work with"), v4l2object->videodev), ("Failed to get number %d in pixelformat enumeration for %s. (%d - %s)", n, v4l2object->videodev, errno, g_strerror (errno)));
g_free (format);
return FALSE;
}
}
/*
* Get the list of supported capture formats, a list of
* <code>struct v4l2_fmtdesc</code>.
*/
GSList *
gst_v4l2_object_get_format_list (GstV4l2Object * v4l2object)
{
if (!v4l2object->formats)
gst_v4l2_object_fill_format_list (v4l2object);
return v4l2object->formats;
}
GstStructure *
gst_v4l2_object_v4l2fourcc_to_structure (guint32 fourcc)
{
GstStructure *structure = NULL;
switch (fourcc) {
case V4L2_PIX_FMT_MJPEG: /* Motion-JPEG */
case V4L2_PIX_FMT_JPEG: /* JFIF JPEG */
structure = gst_structure_new ("image/jpeg", NULL);
break;
case V4L2_PIX_FMT_RGB332:
case V4L2_PIX_FMT_RGB555:
case V4L2_PIX_FMT_RGB555X:
case V4L2_PIX_FMT_RGB565:
case V4L2_PIX_FMT_RGB565X:
case V4L2_PIX_FMT_RGB24:
case V4L2_PIX_FMT_BGR24:
case V4L2_PIX_FMT_RGB32:
case V4L2_PIX_FMT_BGR32:{
guint depth = 0, bpp = 0;
gint endianness = 0;
guint32 r_mask = 0, b_mask = 0, g_mask = 0;
switch (fourcc) {
case V4L2_PIX_FMT_RGB332:
bpp = depth = 8;
endianness = G_BYTE_ORDER; /* 'like, whatever' */
r_mask = 0xe0;
g_mask = 0x1c;
b_mask = 0x03;
break;
case V4L2_PIX_FMT_RGB555:
case V4L2_PIX_FMT_RGB555X:
bpp = 16;
depth = 15;
endianness =
fourcc == V4L2_PIX_FMT_RGB555X ? G_BIG_ENDIAN : G_LITTLE_ENDIAN;
r_mask = 0x7c00;
g_mask = 0x03e0;
b_mask = 0x001f;
break;
case V4L2_PIX_FMT_RGB565:
case V4L2_PIX_FMT_RGB565X:
bpp = depth = 16;
endianness =
fourcc == V4L2_PIX_FMT_RGB565X ? G_BIG_ENDIAN : G_LITTLE_ENDIAN;
r_mask = 0xf800;
g_mask = 0x07e0;
b_mask = 0x001f;
break;
case V4L2_PIX_FMT_RGB24:
bpp = depth = 24;
endianness = G_BIG_ENDIAN;
r_mask = 0xff0000;
g_mask = 0x00ff00;
b_mask = 0x0000ff;
break;
case V4L2_PIX_FMT_BGR24:
bpp = depth = 24;
endianness = G_BIG_ENDIAN;
r_mask = 0x0000ff;
g_mask = 0x00ff00;
b_mask = 0xff0000;
break;
case V4L2_PIX_FMT_RGB32:
bpp = depth = 32;
endianness = G_BIG_ENDIAN;
r_mask = 0xff000000;
g_mask = 0x00ff0000;
b_mask = 0x0000ff00;
break;
case V4L2_PIX_FMT_BGR32:
bpp = depth = 32;
endianness = G_BIG_ENDIAN;
r_mask = 0x000000ff;
g_mask = 0x0000ff00;
b_mask = 0x00ff0000;
break;
default:
g_assert_not_reached ();
break;
}
structure = gst_structure_new ("video/x-raw-rgb",
"bpp", G_TYPE_INT, bpp,
"depth", G_TYPE_INT, depth,
"red_mask", G_TYPE_INT, r_mask,
"green_mask", G_TYPE_INT, g_mask,
"blue_mask", G_TYPE_INT, b_mask,
"endianness", G_TYPE_INT, endianness, NULL);
break;
}
case V4L2_PIX_FMT_GREY: /* 8 Greyscale */
structure = gst_structure_new ("video/x-raw-gray",
"bpp", G_TYPE_INT, 8, NULL);
break;
case V4L2_PIX_FMT_YYUV: /* 16 YUV 4:2:2 */
case V4L2_PIX_FMT_HI240: /* 8 8-bit color */
/* FIXME: get correct fourccs here */
break;
case V4L2_PIX_FMT_NV12: /* 12 Y/CbCr 4:2:0 */
case V4L2_PIX_FMT_NV21: /* 12 Y/CrCb 4:2:0 */
case V4L2_PIX_FMT_YVU410:
case V4L2_PIX_FMT_YUV410:
case V4L2_PIX_FMT_YUV420: /* I420/IYUV */
case V4L2_PIX_FMT_YUYV:
case V4L2_PIX_FMT_YVU420:
case V4L2_PIX_FMT_UYVY:
case V4L2_PIX_FMT_Y41P:
case V4L2_PIX_FMT_YUV422P:
#ifdef V4L2_PIX_FMT_YVYU
case V4L2_PIX_FMT_YVYU:
#endif
case V4L2_PIX_FMT_YUV411P:{
guint32 fcc = 0;
switch (fourcc) {
case V4L2_PIX_FMT_NV12:
fcc = GST_MAKE_FOURCC ('N', 'V', '1', '2');
break;
case V4L2_PIX_FMT_NV21:
fcc = GST_MAKE_FOURCC ('N', 'V', '2', '1');
break;
case V4L2_PIX_FMT_YVU410:
fcc = GST_MAKE_FOURCC ('Y', 'V', 'U', '9');
break;
case V4L2_PIX_FMT_YUV410:
fcc = GST_MAKE_FOURCC ('Y', 'U', 'V', '9');
break;
case V4L2_PIX_FMT_YUV420:
fcc = GST_MAKE_FOURCC ('I', '4', '2', '0');
break;
case V4L2_PIX_FMT_YUYV:
fcc = GST_MAKE_FOURCC ('Y', 'U', 'Y', '2');
break;
case V4L2_PIX_FMT_YVU420:
fcc = GST_MAKE_FOURCC ('Y', 'V', '1', '2');
break;
case V4L2_PIX_FMT_UYVY:
fcc = GST_MAKE_FOURCC ('U', 'Y', 'V', 'Y');
break;
case V4L2_PIX_FMT_Y41P:
fcc = GST_MAKE_FOURCC ('Y', '4', '1', 'P');
break;
case V4L2_PIX_FMT_YUV411P:
fcc = GST_MAKE_FOURCC ('Y', '4', '1', 'B');
break;
case V4L2_PIX_FMT_YUV422P:
fcc = GST_MAKE_FOURCC ('Y', '4', '2', 'B');
break;
#ifdef V4L2_PIX_FMT_YVYU
case V4L2_PIX_FMT_YVYU:
fcc = GST_MAKE_FOURCC ('Y', 'V', 'Y', 'U');
break;
#endif
default:
g_assert_not_reached ();
break;
}
structure = gst_structure_new ("video/x-raw-yuv",
"format", GST_TYPE_FOURCC, fcc, NULL);
break;
}
case V4L2_PIX_FMT_DV:
structure =
gst_structure_new ("video/x-dv", "systemstream", G_TYPE_BOOLEAN, TRUE,
NULL);
break;
case V4L2_PIX_FMT_MPEG: /* MPEG */
structure = gst_structure_new ("video/mpegts", NULL);
break;
case V4L2_PIX_FMT_WNVA: /* Winnov hw compres */
break;
#ifdef V4L2_PIX_FMT_SBGGR8
case V4L2_PIX_FMT_SBGGR8:
structure = gst_structure_new ("video/x-raw-bayer", NULL);
break;
#endif
#ifdef V4L2_PIX_FMT_SN9C10X
case V4L2_PIX_FMT_SN9C10X:
structure = gst_structure_new ("video/x-sonix", NULL);
break;
#endif
#ifdef V4L2_PIX_FMT_PWC1
case V4L2_PIX_FMT_PWC1:
structure = gst_structure_new ("video/x-pwc1", NULL);
break;
#endif
#ifdef V4L2_PIX_FMT_PWC2
case V4L2_PIX_FMT_PWC2:
structure = gst_structure_new ("video/x-pwc2", NULL);
break;
#endif
default:
GST_DEBUG ("Unknown fourcc 0x%08x %" GST_FOURCC_FORMAT,
fourcc, GST_FOURCC_ARGS (fourcc));
break;
}
return structure;
}
GstCaps *
gst_v4l2_object_get_all_caps (void)
{
static GstCaps *caps = NULL;
if (caps == NULL) {
GstStructure *structure;
guint i;
caps = gst_caps_new_empty ();
for (i = 0; i < GST_V4L2_FORMAT_COUNT; i++) {
structure =
gst_v4l2_object_v4l2fourcc_to_structure (gst_v4l2_formats[i].format);
if (structure) {
if (gst_v4l2_formats[i].dimensions) {
gst_structure_set (structure,
"width", GST_TYPE_INT_RANGE, 1, GST_V4L2_MAX_SIZE,
"height", GST_TYPE_INT_RANGE, 1, GST_V4L2_MAX_SIZE,
"framerate", GST_TYPE_FRACTION_RANGE, 0, 1, 100, 1, NULL);
}
gst_caps_append_structure (caps, structure);
}
}
}
return gst_caps_ref (caps);
}
/* collect data for the given caps
* @caps: given input caps
* @format: location for the v4l format
* @w/@h: location for width and height
* @fps_n/@fps_d: location for framerate
* @size: location for expected size of the frame or 0 if unknown
*/
gboolean
gst_v4l2_object_get_caps_info (GstV4l2Object * v4l2object, GstCaps * caps,
struct v4l2_fmtdesc ** format, gint * w, gint * h, guint * fps_n,
guint * fps_d, guint * size)
{
GstStructure *structure;
const GValue *framerate;
guint32 fourcc;
const gchar *mimetype;
guint outsize;
/* default unknown values */
fourcc = 0;
outsize = 0;
structure = gst_caps_get_structure (caps, 0);
mimetype = gst_structure_get_name (structure);
if (strcmp (mimetype, "video/mpegts") == 0) {
fourcc = V4L2_PIX_FMT_MPEG;
outsize = 8192;
*fps_n = 0;
*fps_d = 1;
goto done;
}
if (!gst_structure_get_int (structure, "width", w))
return FALSE;
if (!gst_structure_get_int (structure, "height", h))
return FALSE;
framerate = gst_structure_get_value (structure, "framerate");
if (!framerate)
return FALSE;
*fps_n = gst_value_get_fraction_numerator (framerate);
*fps_d = gst_value_get_fraction_denominator (framerate);
if (!strcmp (mimetype, "video/x-raw-yuv")) {
gst_structure_get_fourcc (structure, "format", &fourcc);
switch (fourcc) {
case GST_MAKE_FOURCC ('I', '4', '2', '0'):
case GST_MAKE_FOURCC ('I', 'Y', 'U', 'V'):
fourcc = V4L2_PIX_FMT_YUV420;
outsize = GST_ROUND_UP_4 (*w) * GST_ROUND_UP_2 (*h);
outsize += 2 * ((GST_ROUND_UP_8 (*w) / 2) * (GST_ROUND_UP_2 (*h) / 2));
break;
case GST_MAKE_FOURCC ('Y', 'U', 'Y', '2'):
fourcc = V4L2_PIX_FMT_YUYV;
outsize = (GST_ROUND_UP_2 (*w) * 2) * *h;
break;
case GST_MAKE_FOURCC ('Y', '4', '1', 'P'):
fourcc = V4L2_PIX_FMT_Y41P;
outsize = (GST_ROUND_UP_2 (*w) * 2) * *h;
break;
case GST_MAKE_FOURCC ('U', 'Y', 'V', 'Y'):
fourcc = V4L2_PIX_FMT_UYVY;
outsize = (GST_ROUND_UP_2 (*w) * 2) * *h;
break;
case GST_MAKE_FOURCC ('Y', 'V', '1', '2'):
fourcc = V4L2_PIX_FMT_YVU420;
outsize = GST_ROUND_UP_4 (*w) * GST_ROUND_UP_2 (*h);
outsize += 2 * ((GST_ROUND_UP_8 (*w) / 2) * (GST_ROUND_UP_2 (*h) / 2));
break;
case GST_MAKE_FOURCC ('Y', '4', '1', 'B'):
fourcc = V4L2_PIX_FMT_YUV411P;
outsize = GST_ROUND_UP_4 (*w) * *h;
outsize += 2 * ((GST_ROUND_UP_8 (*w) / 4) * *h);
break;
case GST_MAKE_FOURCC ('Y', '4', '2', 'B'):
fourcc = V4L2_PIX_FMT_YUV422P;
outsize = GST_ROUND_UP_4 (*w) * *h;
outsize += 2 * ((GST_ROUND_UP_8 (*w) / 2) * *h);
break;
case GST_MAKE_FOURCC ('N', 'V', '1', '2'):
fourcc = V4L2_PIX_FMT_NV12;
outsize = GST_ROUND_UP_4 (*w) * GST_ROUND_UP_2 (*h);
outsize += (GST_ROUND_UP_4 (*w) * *h) / 2;
break;
case GST_MAKE_FOURCC ('N', 'V', '2', '1'):
fourcc = V4L2_PIX_FMT_NV21;
outsize = GST_ROUND_UP_4 (*w) * GST_ROUND_UP_2 (*h);
outsize += (GST_ROUND_UP_4 (*w) * *h) / 2;
break;
#ifdef V4L2_PIX_FMT_YVYU
case GST_MAKE_FOURCC ('Y', 'V', 'Y', 'U'):
fourcc = V4L2_PIX_FMT_YVYU;
outsize = (GST_ROUND_UP_2 (*w) * 2) * *h;
break;
#endif
}
} else if (!strcmp (mimetype, "video/x-raw-rgb")) {
gint depth, endianness, r_mask;
gst_structure_get_int (structure, "depth", &depth);
gst_structure_get_int (structure, "endianness", &endianness);
gst_structure_get_int (structure, "red_mask", &r_mask);
switch (depth) {
case 8:
fourcc = V4L2_PIX_FMT_RGB332;
break;
case 15:
fourcc = (endianness == G_LITTLE_ENDIAN) ?
V4L2_PIX_FMT_RGB555 : V4L2_PIX_FMT_RGB555X;
break;
case 16:
fourcc = (endianness == G_LITTLE_ENDIAN) ?
V4L2_PIX_FMT_RGB565 : V4L2_PIX_FMT_RGB565X;
break;
case 24:
fourcc = (r_mask == 0xFF) ? V4L2_PIX_FMT_BGR24 : V4L2_PIX_FMT_RGB24;
break;
case 32:
fourcc = (r_mask == 0xFF) ? V4L2_PIX_FMT_BGR32 : V4L2_PIX_FMT_RGB32;
break;
}
} else if (strcmp (mimetype, "video/x-dv") == 0) {
fourcc = V4L2_PIX_FMT_DV;
} else if (strcmp (mimetype, "image/jpeg") == 0) {
fourcc = V4L2_PIX_FMT_JPEG;
#ifdef V4L2_PIX_FMT_SBGGR8
} else if (strcmp (mimetype, "video/x-raw-bayer") == 0) {
fourcc = V4L2_PIX_FMT_SBGGR8;
#endif
#ifdef V4L2_PIX_FMT_SN9C10X
} else if (strcmp (mimetype, "video/x-sonix") == 0) {
fourcc = V4L2_PIX_FMT_SN9C10X;
#endif
#ifdef V4L2_PIX_FMT_PWC1
} else if (strcmp (mimetype, "video/x-pwc1") == 0) {
fourcc = V4L2_PIX_FMT_PWC1;
#endif
#ifdef V4L2_PIX_FMT_PWC2
} else if (strcmp (mimetype, "video/x-pwc2") == 0) {
fourcc = V4L2_PIX_FMT_PWC2;
#endif
} else if (strcmp (mimetype, "video/x-raw-gray") == 0) {
fourcc = V4L2_PIX_FMT_GREY;
}
if (fourcc == 0)
return FALSE;
done:
*format = gst_v4l2_object_get_format_from_fourcc (v4l2object, fourcc);
*size = outsize;
return TRUE;
}
/* The frame interval enumeration code first appeared in Linux 2.6.19. */
#ifdef VIDIOC_ENUM_FRAMEINTERVALS
static GstStructure *
gst_v4l2_object_probe_caps_for_format_and_size (GstV4l2Object * v4l2object,
guint32 pixelformat,
guint32 width, guint32 height, const GstStructure * template)
{
gint fd = v4l2object->video_fd;
struct v4l2_frmivalenum ival;
guint32 num, denom;
GstStructure *s;
GValue rates = { 0, };
memset (&ival, 0, sizeof (struct v4l2_frmivalenum));
ival.index = 0;
ival.pixel_format = pixelformat;
ival.width = width;
ival.height = height;
GST_LOG_OBJECT (v4l2object->element,
"get frame interval for %ux%u, %" GST_FOURCC_FORMAT, width, height,
GST_FOURCC_ARGS (pixelformat));
/* keep in mind that v4l2 gives us frame intervals (durations); we invert the
* fraction to get framerate */
if (v4l2_ioctl (fd, VIDIOC_ENUM_FRAMEINTERVALS, &ival) < 0)
goto enum_frameintervals_failed;
if (ival.type == V4L2_FRMIVAL_TYPE_DISCRETE) {
GValue rate = { 0, };
g_value_init (&rates, GST_TYPE_LIST);
g_value_init (&rate, GST_TYPE_FRACTION);
do {
num = ival.discrete.numerator;
denom = ival.discrete.denominator;
if (num > G_MAXINT || denom > G_MAXINT) {
/* let us hope we don't get here... */
num >>= 1;
denom >>= 1;
}
GST_LOG_OBJECT (v4l2object->element, "adding discrete framerate: %d/%d",
denom, num);
/* swap to get the framerate */
gst_value_set_fraction (&rate, denom, num);
gst_value_list_append_value (&rates, &rate);
ival.index++;
} while (v4l2_ioctl (fd, VIDIOC_ENUM_FRAMEINTERVALS, &ival) >= 0);
} else if (ival.type == V4L2_FRMIVAL_TYPE_STEPWISE) {
GValue min = { 0, };
GValue step = { 0, };
GValue max = { 0, };
gboolean added = FALSE;
guint32 minnum, mindenom;
guint32 maxnum, maxdenom;
g_value_init (&rates, GST_TYPE_LIST);
g_value_init (&min, GST_TYPE_FRACTION);
g_value_init (&step, GST_TYPE_FRACTION);
g_value_init (&max, GST_TYPE_FRACTION);
/* get the min */
minnum = ival.stepwise.min.numerator;
mindenom = ival.stepwise.min.denominator;
if (minnum > G_MAXINT || mindenom > G_MAXINT) {
minnum >>= 1;
mindenom >>= 1;
}
GST_LOG_OBJECT (v4l2object->element, "stepwise min frame interval: %d/%d",
minnum, mindenom);
gst_value_set_fraction (&min, minnum, mindenom);
/* get the max */
maxnum = ival.stepwise.max.numerator;
maxdenom = ival.stepwise.max.denominator;
if (maxnum > G_MAXINT || maxdenom > G_MAXINT) {
maxnum >>= 1;
maxdenom >>= 1;
}
GST_LOG_OBJECT (v4l2object->element, "stepwise max frame interval: %d/%d",
maxnum, maxdenom);
gst_value_set_fraction (&max, maxnum, maxdenom);
/* get the step */
num = ival.stepwise.step.numerator;
denom = ival.stepwise.step.denominator;
if (num > G_MAXINT || denom > G_MAXINT) {
num >>= 1;
denom >>= 1;
}
if (num == 0 || denom == 0) {
/* in this case we have a wrong fraction or no step, set the step to max
* so that we only add the min value in the loop below */
num = maxnum;
denom = maxdenom;
}
/* since we only have gst_value_fraction_subtract and not add, negate the
* numerator */
GST_LOG_OBJECT (v4l2object->element, "stepwise step frame interval: %d/%d",
num, denom);
gst_value_set_fraction (&step, -num, denom);
while (gst_value_compare (&min, &max) <= 0) {
GValue rate = { 0, };
num = gst_value_get_fraction_numerator (&min);
denom = gst_value_get_fraction_denominator (&min);
GST_LOG_OBJECT (v4l2object->element, "adding stepwise framerate: %d/%d",
denom, num);
/* invert to get the framerate */
g_value_init (&rate, GST_TYPE_FRACTION);
gst_value_set_fraction (&rate, denom, num);
gst_value_list_append_value (&rates, &rate);
added = TRUE;
/* we're actually adding because step was negated above. This is because
* there is no _add function... */
if (!gst_value_fraction_subtract (&min, &min, &step)) {
GST_WARNING_OBJECT (v4l2object->element, "could not step fraction!");
break;
}
}
if (!added) {
/* no range was added, leave the default range from the template */
GST_WARNING_OBJECT (v4l2object->element,
"no range added, leaving default");
g_value_unset (&rates);
}
} else if (ival.type == V4L2_FRMIVAL_TYPE_CONTINUOUS) {
guint32 maxnum, maxdenom;
g_value_init (&rates, GST_TYPE_FRACTION_RANGE);
num = ival.stepwise.min.numerator;
denom = ival.stepwise.min.denominator;
if (num > G_MAXINT || denom > G_MAXINT) {
num >>= 1;
denom >>= 1;
}
maxnum = ival.stepwise.max.numerator;
maxdenom = ival.stepwise.max.denominator;
if (maxnum > G_MAXINT || maxdenom > G_MAXINT) {
maxnum >>= 1;
maxdenom >>= 1;
}
GST_LOG_OBJECT (v4l2object->element,
"continuous frame interval %d/%d to %d/%d", maxdenom, maxnum, denom,
num);
gst_value_set_fraction_range_full (&rates, maxdenom, maxnum, denom, num);
} else {
goto unknown_type;
}
return_data:
s = gst_structure_copy (template);
gst_structure_set (s, "width", G_TYPE_INT, (gint) width,
"height", G_TYPE_INT, (gint) height, NULL);
if (G_IS_VALUE (&rates)) {
/* only change the framerate on the template when we have a valid probed new
* value */
gst_structure_set_value (s, "framerate", &rates);
g_value_unset (&rates);
} else {
gst_structure_set (s, "framerate", GST_TYPE_FRACTION_RANGE, 0, 1, 100, 1,
NULL);
}
return s;
/* ERRORS */
enum_frameintervals_failed:
{
GST_DEBUG_OBJECT (v4l2object->element,
"Unable to enumerate intervals for %" GST_FOURCC_FORMAT "@%ux%u",
GST_FOURCC_ARGS (pixelformat), width, height);
goto return_data;
}
unknown_type:
{
/* I don't see how this is actually an error, we ignore the format then */
GST_WARNING_OBJECT (v4l2object->element,
"Unknown frame interval type at %" GST_FOURCC_FORMAT "@%ux%u: %u",
GST_FOURCC_ARGS (pixelformat), width, height, ival.type);
return NULL;
}
}
#endif /* defined VIDIOC_ENUM_FRAMEINTERVALS */
#ifdef VIDIOC_ENUM_FRAMESIZES
static gint
sort_by_frame_size (GstStructure * s1, GstStructure * s2)
{
int w1, h1, w2, h2;
gst_structure_get_int (s1, "width", &w1);
gst_structure_get_int (s1, "height", &h1);
gst_structure_get_int (s2, "width", &w2);
gst_structure_get_int (s2, "height", &h2);
/* I think it's safe to assume that this won't overflow for a while */
return ((w2 * h2) - (w1 * h1));
}
#endif
static gboolean
gst_v4l2_object_get_nearest_size (GstV4l2Object * v4l2object,
guint32 pixelformat, gint * width, gint * height);
GstCaps *
gst_v4l2_object_probe_caps_for_format (GstV4l2Object * v4l2object,
guint32 pixelformat, const GstStructure * template)
{
GstCaps *ret = gst_caps_new_empty ();
GstStructure *tmp;
#ifdef VIDIOC_ENUM_FRAMESIZES
gint fd = v4l2object->video_fd;
struct v4l2_frmsizeenum size;
GList *results = NULL;
guint32 w, h;
if (pixelformat == GST_MAKE_FOURCC ('M', 'P', 'E', 'G'))
return gst_caps_new_simple ("video/mpegts", NULL);
memset (&size, 0, sizeof (struct v4l2_frmsizeenum));
size.index = 0;
size.pixel_format = pixelformat;
GST_DEBUG_OBJECT (v4l2object->element, "Enumerating frame sizes");
if (v4l2_ioctl (fd, VIDIOC_ENUM_FRAMESIZES, &size) < 0)
goto enum_framesizes_failed;
if (size.type == V4L2_FRMSIZE_TYPE_DISCRETE) {
do {
GST_LOG_OBJECT (v4l2object->element, "got discrete frame size %dx%d",
size.discrete.width, size.discrete.height);
w = MIN (size.discrete.width, G_MAXINT);
h = MIN (size.discrete.height, G_MAXINT);
if (w && h) {
tmp =
gst_v4l2_object_probe_caps_for_format_and_size (v4l2object,
pixelformat, w, h, template);
if (tmp)
results = g_list_prepend (results, tmp);
}
size.index++;
} while (v4l2_ioctl (fd, VIDIOC_ENUM_FRAMESIZES, &size) >= 0);
GST_DEBUG_OBJECT (v4l2object->element,
"done iterating discrete frame sizes");
} else if (size.type == V4L2_FRMSIZE_TYPE_STEPWISE) {
GST_DEBUG_OBJECT (v4l2object->element, "we have stepwise frame sizes:");
GST_DEBUG_OBJECT (v4l2object->element, "min width: %d",
size.stepwise.min_width);
GST_DEBUG_OBJECT (v4l2object->element, "min height: %d",
size.stepwise.min_height);
GST_DEBUG_OBJECT (v4l2object->element, "max width: %d",
size.stepwise.max_width);
GST_DEBUG_OBJECT (v4l2object->element, "min height: %d",
size.stepwise.max_height);
GST_DEBUG_OBJECT (v4l2object->element, "step width: %d",
size.stepwise.step_width);
GST_DEBUG_OBJECT (v4l2object->element, "step height: %d",
size.stepwise.step_height);
for (w = size.stepwise.min_width, h = size.stepwise.min_height;
w < size.stepwise.max_width && h < size.stepwise.max_height;
w += size.stepwise.step_width, h += size.stepwise.step_height) {
if (w == 0 || h == 0)
continue;
tmp =
gst_v4l2_object_probe_caps_for_format_and_size (v4l2object,
pixelformat, w, h, template);
if (tmp)
results = g_list_prepend (results, tmp);
}
GST_DEBUG_OBJECT (v4l2object->element,
"done iterating stepwise frame sizes");
} else if (size.type == V4L2_FRMSIZE_TYPE_CONTINUOUS) {
guint32 maxw, maxh;
GST_DEBUG_OBJECT (v4l2object->element, "we have continuous frame sizes:");
GST_DEBUG_OBJECT (v4l2object->element, "min width: %d",
size.stepwise.min_width);
GST_DEBUG_OBJECT (v4l2object->element, "min height: %d",
size.stepwise.min_height);
GST_DEBUG_OBJECT (v4l2object->element, "max width: %d",
size.stepwise.max_width);
GST_DEBUG_OBJECT (v4l2object->element, "min height: %d",
size.stepwise.max_height);
w = MAX (size.stepwise.min_width, 1);
h = MAX (size.stepwise.min_height, 1);
maxw = MIN (size.stepwise.max_width, G_MAXINT);
maxh = MIN (size.stepwise.max_height, G_MAXINT);
tmp =
gst_v4l2_object_probe_caps_for_format_and_size (v4l2object, pixelformat,
w, h, template);
if (tmp) {
gst_structure_set (tmp, "width", GST_TYPE_INT_RANGE, (gint) w,
(gint) maxw, "height", GST_TYPE_INT_RANGE, (gint) h, (gint) maxh,
NULL);
/* no point using the results list here, since there's only one struct */
gst_caps_append_structure (ret, tmp);
}
} else {
goto unknown_type;
}
/* we use an intermediary list to store and then sort the results of the
* probing because we can't make any assumptions about the order in which
* the driver will give us the sizes, but we want the final caps to contain
* the results starting with the highest resolution and having the lowest
* resolution last, since order in caps matters for things like fixation. */
results = g_list_sort (results, (GCompareFunc) sort_by_frame_size);
while (results != NULL) {
gst_caps_append_structure (ret, GST_STRUCTURE (results->data));
results = g_list_delete_link (results, results);
}
if (gst_caps_is_empty (ret))
goto enum_framesizes_no_results;
return ret;
/* ERRORS */
enum_framesizes_failed:
{
/* I don't see how this is actually an error */
GST_DEBUG_OBJECT (v4l2object->element,
"Failed to enumerate frame sizes for pixelformat %" GST_FOURCC_FORMAT
" (%s)", GST_FOURCC_ARGS (pixelformat), g_strerror (errno));
goto default_frame_sizes;
}
enum_framesizes_no_results:
{
/* it's possible that VIDIOC_ENUM_FRAMESIZES is defined but the driver in
* question doesn't actually support it yet */
GST_DEBUG_OBJECT (v4l2object->element,
"No results for pixelformat %" GST_FOURCC_FORMAT
" enumerating frame sizes, trying fallback",
GST_FOURCC_ARGS (pixelformat));
goto default_frame_sizes;
}
unknown_type:
{
GST_WARNING_OBJECT (v4l2object->element,
"Unknown frame sizeenum type for pixelformat %" GST_FOURCC_FORMAT
": %u", GST_FOURCC_ARGS (pixelformat), size.type);
goto default_frame_sizes;
}
default_frame_sizes:
#endif /* defined VIDIOC_ENUM_FRAMESIZES */
{
gint min_w, max_w, min_h, max_h, fix_num = 0, fix_denom = 0;
/* This code is for Linux < 2.6.19 */
min_w = min_h = 1;
max_w = max_h = GST_V4L2_MAX_SIZE;
if (!gst_v4l2_object_get_nearest_size (v4l2object, pixelformat, &min_w,
&min_h)) {
GST_WARNING_OBJECT (v4l2object->element,
"Could not probe minimum capture size for pixelformat %"
GST_FOURCC_FORMAT, GST_FOURCC_ARGS (pixelformat));
}
if (!gst_v4l2_object_get_nearest_size (v4l2object, pixelformat, &max_w,
&max_h)) {
GST_WARNING_OBJECT (v4l2object->element,
"Could not probe maximum capture size for pixelformat %"
GST_FOURCC_FORMAT, GST_FOURCC_ARGS (pixelformat));
}
/* Since we can't get framerate directly, try to use the current norm */
if (v4l2object->norm && v4l2object->norms) {
GList *norms;
GstTunerNorm *norm = NULL;
for (norms = v4l2object->norms; norms != NULL; norms = norms->next) {
norm = (GstTunerNorm *) norms->data;
if (!strcmp (norm->label, v4l2object->norm))
break;
}
/* If it's possible, set framerate to that (discrete) value */
if (norm) {
fix_num = gst_value_get_fraction_numerator (&norm->framerate);
fix_denom = gst_value_get_fraction_denominator (&norm->framerate);
}
}
tmp = gst_structure_copy (template);
if (fix_num) {
gst_structure_set (tmp, "framerate", GST_TYPE_FRACTION, fix_num,
fix_denom, NULL);
} else {
/* if norm can't be used, copy the template framerate */
gst_structure_set (tmp, "framerate", GST_TYPE_FRACTION_RANGE, 0, 1,
100, 1, NULL);
}
if (min_w == max_w)
gst_structure_set (tmp, "width", G_TYPE_INT, max_w, NULL);
else
gst_structure_set (tmp, "width", GST_TYPE_INT_RANGE, min_w, max_w, NULL);
if (min_h == max_h)
gst_structure_set (tmp, "height", G_TYPE_INT, max_h, NULL);
else
gst_structure_set (tmp, "height", GST_TYPE_INT_RANGE, min_h, max_h, NULL);
gst_caps_append_structure (ret, tmp);
return ret;
}
}
static gboolean
gst_v4l2_object_get_nearest_size (GstV4l2Object * v4l2object,
guint32 pixelformat, gint * width, gint * height)
{
struct v4l2_format fmt;
int fd;
int r;
g_return_val_if_fail (width != NULL, FALSE);
g_return_val_if_fail (height != NULL, FALSE);
GST_LOG_OBJECT (v4l2object->element,
"getting nearest size to %dx%d with format %" GST_FOURCC_FORMAT,
*width, *height, GST_FOURCC_ARGS (pixelformat));
fd = v4l2object->video_fd;
/* get size delimiters */
memset (&fmt, 0, sizeof (fmt));
fmt.type = v4l2object->type;
fmt.fmt.pix.width = *width;
fmt.fmt.pix.height = *height;
fmt.fmt.pix.pixelformat = pixelformat;
fmt.fmt.pix.field = V4L2_FIELD_INTERLACED;
r = v4l2_ioctl (fd, VIDIOC_TRY_FMT, &fmt);
if (r < 0 && errno == EINVAL) {
/* try again with progressive video */
fmt.fmt.pix.width = *width;
fmt.fmt.pix.height = *height;
fmt.fmt.pix.pixelformat = pixelformat;
fmt.fmt.pix.field = V4L2_FIELD_NONE;
r = v4l2_ioctl (fd, VIDIOC_TRY_FMT, &fmt);
}
if (r < 0) {
/* The driver might not implement TRY_FMT, in which case we will try
S_FMT to probe */
if (errno != ENOTTY)
return FALSE;
/* Only try S_FMT if we're not actively capturing yet, which we shouldn't
be, because we're still probing */
if (GST_V4L2_IS_ACTIVE (v4l2object))
return FALSE;
GST_LOG_OBJECT (v4l2object->element,
"Failed to probe size limit with VIDIOC_TRY_FMT, trying VIDIOC_S_FMT");
fmt.fmt.pix.width = *width;
fmt.fmt.pix.height = *height;
r = v4l2_ioctl (fd, VIDIOC_S_FMT, &fmt);
if (r < 0 && errno == EINVAL) {
/* try again with progressive video */
fmt.fmt.pix.width = *width;
fmt.fmt.pix.height = *height;
fmt.fmt.pix.pixelformat = pixelformat;
fmt.fmt.pix.field = V4L2_FIELD_NONE;
r = v4l2_ioctl (fd, VIDIOC_S_FMT, &fmt);
}
if (r < 0)
return FALSE;
}
GST_LOG_OBJECT (v4l2object->element,
"got nearest size %dx%d", fmt.fmt.pix.width, fmt.fmt.pix.height);
*width = fmt.fmt.pix.width;
*height = fmt.fmt.pix.height;
return TRUE;
}
gboolean
gst_v4l2_object_set_format (GstV4l2Object * v4l2object, guint32 pixelformat,
guint32 width, guint32 height)
{
gint fd = v4l2object->video_fd;
struct v4l2_format format;
GST_DEBUG_OBJECT (v4l2object->element, "Setting format to %dx%d, format "
"%" GST_FOURCC_FORMAT, width, height, GST_FOURCC_ARGS (pixelformat));
GST_V4L2_CHECK_OPEN (v4l2object);
GST_V4L2_CHECK_NOT_ACTIVE (v4l2object);
if (pixelformat == GST_MAKE_FOURCC ('M', 'P', 'E', 'G'))
return TRUE;
memset (&format, 0x00, sizeof (struct v4l2_format));
format.type = v4l2object->type;
if (v4l2_ioctl (fd, VIDIOC_G_FMT, &format) < 0)
goto get_fmt_failed;
if (format.type == v4l2object->type &&
format.fmt.pix.width == width &&
format.fmt.pix.height == height &&
format.fmt.pix.pixelformat == pixelformat) {
/* Nothing to do. We want to succeed immediately
* here because setting the same format back
* can still fail due to EBUSY. By short-circuiting
* here, we allow pausing and re-playing pipelines
* with changed caps, as long as the changed caps
* do not change the webcam's format. Otherwise,
* any caps change would require us to go to NULL
* state to close the device and set format.
*/
return TRUE;
}
format.type = v4l2object->type;
format.fmt.pix.width = width;
format.fmt.pix.height = height;
format.fmt.pix.pixelformat = pixelformat;
/* FIXME: request whole frames; need to use gstreamer interlace support
* (INTERLACED mode returns frames where the fields have already been
* combined, there are other modes for requesting fields individually) */
format.fmt.pix.field = V4L2_FIELD_INTERLACED;
if (v4l2_ioctl (fd, VIDIOC_S_FMT, &format) < 0) {
/* we might also get EBUSY here */
if (errno != EINVAL)
goto set_fmt_failed;
GST_DEBUG_OBJECT (v4l2object->element, "trying again...");
/* try again with progressive video */
format.fmt.pix.width = width;
format.fmt.pix.height = height;
format.fmt.pix.pixelformat = pixelformat;
format.fmt.pix.field = V4L2_FIELD_NONE;
if (v4l2_ioctl (fd, VIDIOC_S_FMT, &format) < 0)
goto set_fmt_failed;
}
if (format.fmt.pix.width != width || format.fmt.pix.height != height)
goto invalid_dimensions;
if (format.fmt.pix.pixelformat != pixelformat)
goto invalid_pixelformat;
return TRUE;
/* ERRORS */
get_fmt_failed:
{
GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, SETTINGS,
(_("Device '%s' does not support video capture"),
v4l2object->videodev),
("Call to G_FMT failed: (%s)", g_strerror (errno)));
return FALSE;
}
set_fmt_failed:
{
GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, SETTINGS,
(_("Device '%s' cannot capture at %dx%d"),
v4l2object->videodev, width, height),
("Call to S_FMT failed for %" GST_FOURCC_FORMAT " @ %dx%d: %s",
GST_FOURCC_ARGS (pixelformat), width, height, g_strerror (errno)));
return FALSE;
}
invalid_dimensions:
{
GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, SETTINGS,
(_("Device '%s' cannot capture at %dx%d"),
v4l2object->videodev, width, height),
("Tried to capture at %dx%d, but device returned size %dx%d",
width, height, format.fmt.pix.width, format.fmt.pix.height));
return FALSE;
}
invalid_pixelformat:
{
GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, SETTINGS,
(_("Device '%s' cannot capture in the specified format"),
v4l2object->videodev),
("Tried to capture in %" GST_FOURCC_FORMAT
", but device returned format" " %" GST_FOURCC_FORMAT,
GST_FOURCC_ARGS (pixelformat),
GST_FOURCC_ARGS (format.fmt.pix.pixelformat)));
return FALSE;
}
}
gboolean
gst_v4l2_object_start_streaming (GstV4l2Object * v4l2object)
{
if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_STREAMON,
&(v4l2object->type)) < 0) {
GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, OPEN_READ,
(_("Error starting streaming on device '%s'."), v4l2object->videodev),
GST_ERROR_SYSTEM);
return FALSE;
}
return TRUE;
}
gboolean
gst_v4l2_object_stop_streaming (GstV4l2Object * v4l2object)
{
if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_STREAMOFF,
&(v4l2object->type)) < 0) {
GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, OPEN_READ,
(_("Error stopping streaming on device '%s'."), v4l2object->videodev),
GST_ERROR_SYSTEM);
return FALSE;
}
return TRUE;
}
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