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gstreamer/sys/v4l2/gstv4l2object.c
Wim Taymans 47816e1155 v4l2: fix error messages
2011-07-15 12:00:54 +02:00

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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"
#ifdef HAVE_XVIDEO
#include "gstv4l2xoverlay.h"
#endif
#include "gstv4l2colorbalance.h"
#include "gst/gst-i18n-plugin.h"
#include <gst/video/video.h>
/* videodev2.h is not versioned and we can't easily check for the presence
* of enum values at compile time, but the V4L2_CAP_VIDEO_OUTPUT_OVERLAY define
* was added in the same commit as V4L2_FIELD_INTERLACED_{TB,BT} (b2787845) */
#ifndef V4L2_CAP_VIDEO_OUTPUT_OVERLAY
#define V4L2_FIELD_INTERLACED_TB 8
#define V4L2_FIELD_INTERLACED_BT 9
#endif
GST_DEBUG_CATEGORY_EXTERN (v4l2_debug);
GST_DEBUG_CATEGORY_EXTERN (GST_CAT_PERFORMANCE);
#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_TV_NORM 0
#define DEFAULT_PROP_CHANNEL NULL
#define DEFAULT_PROP_FREQUENCY 0
enum
{
PROP_0,
V4L2_STD_OBJECT_PROPS,
};
G_LOCK_DEFINE_STATIC (probe_lock);
const GList *
gst_v4l2_probe_get_properties (GstPropertyProbe * probe)
{
GObjectClass *klass = G_OBJECT_GET_CLASS (probe);
static GList *list = NULL;
G_LOCK (probe_lock);
if (!list) {
list = g_list_append (NULL, g_object_class_find_property (klass, "device"));
}
G_UNLOCK (probe_lock);
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;
}
#define GST_TYPE_V4L2_TV_NORM (gst_v4l2_tv_norm_get_type ())
static GType
gst_v4l2_tv_norm_get_type (void)
{
static GType v4l2_tv_norm = 0;
if (!v4l2_tv_norm) {
static const GEnumValue tv_norms[] = {
{0, "none", "none"},
{V4L2_STD_NTSC, "NTSC", "NTSC"},
{V4L2_STD_NTSC_M, "NTSC-M", "NTSC-M"},
{V4L2_STD_NTSC_M_JP, "NTSC-M-JP", "NTSC-M-JP"},
{V4L2_STD_NTSC_M_KR, "NTSC-M-KR", "NTSC-M-KR"},
{V4L2_STD_NTSC_443, "NTSC-443", "NTSC-443"},
{V4L2_STD_PAL, "PAL", "PAL"},
{V4L2_STD_PAL_BG, "PAL-BG", "PAL-BG"},
{V4L2_STD_PAL_B, "PAL-B", "PAL-B"},
{V4L2_STD_PAL_B1, "PAL-B1", "PAL-B1"},
{V4L2_STD_PAL_G, "PAL-G", "PAL-G"},
{V4L2_STD_PAL_H, "PAL-H", "PAL-H"},
{V4L2_STD_PAL_I, "PAL-I", "PAL-I"},
{V4L2_STD_PAL_DK, "PAL-DK", "PAL-DK"},
{V4L2_STD_PAL_D, "PAL-D", "PAL-D"},
{V4L2_STD_PAL_D1, "PAL-D1", "PAL-D1"},
{V4L2_STD_PAL_K, "PAL-K", "PAL-K"},
{V4L2_STD_PAL_M, "PAL-M", "PAL-M"},
{V4L2_STD_PAL_N, "PAL-N", "PAL-N"},
{V4L2_STD_PAL_Nc, "PAL-Nc", "PAL-Nc"},
{V4L2_STD_PAL_60, "PAL-60", "PAL-60"},
{V4L2_STD_SECAM, "SECAM", "SECAM"},
{V4L2_STD_SECAM_B, "SECAM-B", "SECAM-B"},
{V4L2_STD_SECAM_G, "SECAM-G", "SECAM-G"},
{V4L2_STD_SECAM_H, "SECAM-H", "SECAM-H"},
{V4L2_STD_SECAM_DK, "SECAM-DK", "SECAM-DK"},
{V4L2_STD_SECAM_D, "SECAM-D", "SECAM-D"},
{V4L2_STD_SECAM_K, "SECAM-K", "SECAM-K"},
{V4L2_STD_SECAM_K1, "SECAM-K1", "SECAM-K1"},
{V4L2_STD_SECAM_L, "SECAM-L", "SECAM-L"},
{V4L2_STD_SECAM_LC, "SECAM-Lc", "SECAM-Lc"},
{0, NULL, NULL}
};
v4l2_tv_norm = g_enum_register_static ("V4L2_TV_norms", tv_norms);
}
return v4l2_tv_norm;
}
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_PARAM_STATIC_STRINGS));
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_PARAM_STATIC_STRINGS));
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_PARAM_STATIC_STRINGS));
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 | G_PARAM_STATIC_STRINGS));
/**
* GstV4l2Src:brightness
*
* Picture brightness, or more precisely, the black level
*
* Since: 0.10.26
*/
g_object_class_install_property (gobject_class, PROP_BRIGHTNESS,
g_param_spec_int ("brightness", "Brightness",
"Picture brightness, or more precisely, the black level", G_MININT,
G_MAXINT, 0,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS | GST_PARAM_CONTROLLABLE));
/**
* GstV4l2Src:contrast
*
* Picture contrast or luma gain
*
* Since: 0.10.26
*/
g_object_class_install_property (gobject_class, PROP_CONTRAST,
g_param_spec_int ("contrast", "Contrast",
"Picture contrast or luma gain", G_MININT,
G_MAXINT, 0,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS | GST_PARAM_CONTROLLABLE));
/**
* GstV4l2Src:saturation
*
* Picture color saturation or chroma gain
*
* Since: 0.10.26
*/
g_object_class_install_property (gobject_class, PROP_SATURATION,
g_param_spec_int ("saturation", "Saturation",
"Picture color saturation or chroma gain", G_MININT,
G_MAXINT, 0,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS | GST_PARAM_CONTROLLABLE));
/**
* GstV4l2Src:hue
*
* Hue or color balance
*
* Since: 0.10.26
*/
g_object_class_install_property (gobject_class, PROP_HUE,
g_param_spec_int ("hue", "Hue",
"Hue or color balance", G_MININT,
G_MAXINT, 0,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS | GST_PARAM_CONTROLLABLE));
/**
* GstV4l2Src:norm
*
* TV norm
*
* Since: 0.10.30
*/
g_object_class_install_property (gobject_class, PROP_TV_NORM,
g_param_spec_enum ("norm", "TV norm",
"video standard",
GST_TYPE_V4L2_TV_NORM, DEFAULT_PROP_TV_NORM,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
}
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->active = FALSE;
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->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;
}
static gint
gst_v4l2_object_prop_to_cid (guint prop_id)
{
gint cid = -1;
switch (prop_id) {
case PROP_BRIGHTNESS:
cid = V4L2_CID_BRIGHTNESS;
break;
case PROP_CONTRAST:
cid = V4L2_CID_CONTRAST;
break;
case PROP_SATURATION:
cid = V4L2_CID_SATURATION;
break;
case PROP_HUE:
cid = V4L2_CID_HUE;
break;
default:
GST_WARNING ("unmapped property id: %d", prop_id);
}
return cid;
}
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;
case PROP_BRIGHTNESS:
case PROP_CONTRAST:
case PROP_SATURATION:
case PROP_HUE:
{
gint cid = gst_v4l2_object_prop_to_cid (prop_id);
if (cid != -1) {
if (GST_V4L2_IS_OPEN (v4l2object)) {
gst_v4l2_set_attribute (v4l2object, cid, g_value_get_int (value));
}
}
return TRUE;
}
break;
case PROP_TV_NORM:
v4l2object->tv_norm = g_value_get_enum (value);
break;
#if 0
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;
}
case PROP_BRIGHTNESS:
case PROP_CONTRAST:
case PROP_SATURATION:
case PROP_HUE:
{
gint cid = gst_v4l2_object_prop_to_cid (prop_id);
if (cid != -1) {
if (GST_V4L2_IS_OPEN (v4l2object)) {
gint v;
if (gst_v4l2_get_attribute (v4l2object, cid, &v)) {
g_value_set_int (value, v);
}
}
}
return TRUE;
}
break;
case PROP_TV_NORM:
g_value_set_enum (value, v4l2object->tv_norm);
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->tv_norm)
norm = gst_v4l2_tuner_get_norm_by_std_id (v4l2object, v4l2object->tv_norm);
GST_DEBUG_OBJECT (v4l2object->element, "tv_norm=%d, norm=%p",
v4l2object->tv_norm, norm);
if (norm) {
gst_tuner_set_norm (tuner, norm);
} else {
norm =
GST_TUNER_NORM (gst_tuner_get_norm (GST_TUNER (v4l2object->element)));
if (norm) {
v4l2object->tv_norm =
gst_v4l2_tuner_get_std_id_by_norm (v4l2object, norm);
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_open (GstV4l2Object * v4l2object)
{
if (gst_v4l2_open (v4l2object))
gst_v4l2_set_defaults (v4l2object);
else
return FALSE;
#ifdef HAVE_XVIDEO
gst_v4l2_xoverlay_start (v4l2object);
#endif
return TRUE;
}
gboolean
gst_v4l2_object_close (GstV4l2Object * v4l2object)
{
#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},
#ifdef V4L2_PIX_FMT_PJPG
{V4L2_PIX_FMT_PJPG, TRUE},
#endif
{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 ||
fmt->pixelformat == V4L2_PIX_FMT_JPEG
#ifdef V4L2_PIX_FMT_PJPG
|| fmt->pixelformat == V4L2_PIX_FMT_PJPG
#endif
) {
if (fourcc == V4L2_PIX_FMT_JPEG || fourcc == V4L2_PIX_FMT_MJPEG
#ifdef V4L2_PIX_FMT_PJPG
|| fourcc == V4L2_PIX_FMT_PJPG
#endif
) {
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:
#ifdef V4L2_PIX_FMT_PJPG
case V4L2_PIX_FMT_PJPG:
rank = JPEG_BASE_RANK;
break;
#endif
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 (fb) -
gst_v4l2_object_format_get_rank (fa);
}
/******************************************************
* 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);
}
#ifndef GST_DISABLE_GST_DEBUG
{
GSList *l;
GST_INFO_OBJECT (v4l2object->element, "got %d format(s):", n);
for (l = v4l2object->formats; l != NULL; l = l->next) {
format = l->data;
GST_INFO_OBJECT (v4l2object->element,
" %" GST_FOURCC_FORMAT "%s", GST_FOURCC_ARGS (format->pixelformat),
((format->flags & V4L2_FMT_FLAG_EMULATED)) ? " (emulated)" : "");
}
}
#endif
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 */
#ifdef V4L2_PIX_FMT_PJPG
case V4L2_PIX_FMT_PJPG: /* Progressive-JPEG */
#endif
case V4L2_PIX_FMT_JPEG: /* JFIF JPEG */
structure = gst_structure_new ("image/jpeg", 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_RGB332:
case V4L2_PIX_FMT_RGB555X:
case V4L2_PIX_FMT_RGB565X:
/* FIXME: get correct fourccs here */
break;
case V4L2_PIX_FMT_GREY: /* 8 Greyscale */
case V4L2_PIX_FMT_RGB555:
case V4L2_PIX_FMT_RGB565:
case V4L2_PIX_FMT_RGB24:
case V4L2_PIX_FMT_BGR24:
case V4L2_PIX_FMT_RGB32:
case V4L2_PIX_FMT_BGR32:
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:
#if 0
case V4L2_PIX_FMT_Y41P:
#endif
case V4L2_PIX_FMT_YUV422P:
#ifdef V4L2_PIX_FMT_YVYU
case V4L2_PIX_FMT_YVYU:
#endif
case V4L2_PIX_FMT_YUV411P:{
GstVideoFormat format;
switch (fourcc) {
case V4L2_PIX_FMT_GREY: /* 8 Greyscale */
format = GST_VIDEO_FORMAT_GRAY8;
break;
case V4L2_PIX_FMT_RGB555:
format = GST_VIDEO_FORMAT_RGB15;
break;
case V4L2_PIX_FMT_RGB565:
format = GST_VIDEO_FORMAT_RGB16;
break;
case V4L2_PIX_FMT_RGB24:
format = GST_VIDEO_FORMAT_RGB;
break;
case V4L2_PIX_FMT_BGR24:
format = GST_VIDEO_FORMAT_BGR;
break;
case V4L2_PIX_FMT_RGB32:
format = GST_VIDEO_FORMAT_RGBx;
break;
case V4L2_PIX_FMT_BGR32:
format = GST_VIDEO_FORMAT_BGRx;
break;
case V4L2_PIX_FMT_NV12:
format = GST_VIDEO_FORMAT_NV12;
break;
case V4L2_PIX_FMT_NV21:
format = GST_VIDEO_FORMAT_NV21;
break;
case V4L2_PIX_FMT_YVU410:
format = GST_VIDEO_FORMAT_YVU9;
break;
case V4L2_PIX_FMT_YUV410:
format = GST_VIDEO_FORMAT_YUV9;
break;
case V4L2_PIX_FMT_YUV420:
format = GST_VIDEO_FORMAT_I420;
break;
case V4L2_PIX_FMT_YUYV:
format = GST_VIDEO_FORMAT_YUY2;
break;
case V4L2_PIX_FMT_YVU420:
format = GST_VIDEO_FORMAT_YV12;
break;
case V4L2_PIX_FMT_UYVY:
format = GST_VIDEO_FORMAT_UYVY;
break;
#if 0
case V4L2_PIX_FMT_Y41P:
format = GST_VIDEO_FORMAT_Y41P;
break;
#endif
case V4L2_PIX_FMT_YUV411P:
format = GST_VIDEO_FORMAT_Y41B;
break;
case V4L2_PIX_FMT_YUV422P:
format = GST_VIDEO_FORMAT_Y42B;
break;
#ifdef V4L2_PIX_FMT_YVYU
case V4L2_PIX_FMT_YVYU:
format = GST_VIDEO_FORMAT_YVYU;
break;
#endif
default:
g_assert_not_reached ();
break;
}
structure = gst_structure_new ("video/x-raw",
"format", G_TYPE_STRING, gst_video_format_to_string (format), 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
*/
static gboolean
gst_v4l2_object_get_caps_info (GstV4l2Object * v4l2object, GstCaps * caps,
struct v4l2_fmtdesc **format, GstVideoInfo * info)
{
GstStructure *structure;
guint32 fourcc;
const gchar *mimetype;
/* default unknown values */
fourcc = 0;
structure = gst_caps_get_structure (caps, 0);
mimetype = gst_structure_get_name (structure);
if (g_str_equal (mimetype, "video/x-raw")) {
/* raw caps, parse into video info */
if (!gst_video_info_from_caps (info, caps))
goto invalid_format;
switch (GST_VIDEO_INFO_FORMAT (info)) {
case GST_VIDEO_FORMAT_I420:
fourcc = V4L2_PIX_FMT_YUV420;
break;
case GST_VIDEO_FORMAT_YUY2:
fourcc = V4L2_PIX_FMT_YUYV;
break;
#if 0
case GST_VIDEO_FORMAT_Y41P:
fourcc = V4L2_PIX_FMT_Y41P;
break;
#endif
case GST_VIDEO_FORMAT_UYVY:
fourcc = V4L2_PIX_FMT_UYVY;
break;
case GST_VIDEO_FORMAT_YV12:
fourcc = V4L2_PIX_FMT_YVU420;
break;
case GST_VIDEO_FORMAT_Y41B:
fourcc = V4L2_PIX_FMT_YUV411P;
break;
case GST_VIDEO_FORMAT_Y42B:
fourcc = V4L2_PIX_FMT_YUV422P;
break;
case GST_VIDEO_FORMAT_NV12:
fourcc = V4L2_PIX_FMT_NV12;
break;
case GST_VIDEO_FORMAT_NV21:
fourcc = V4L2_PIX_FMT_NV21;
break;
#ifdef V4L2_PIX_FMT_YVYU
case GST_VIDEO_FORMAT_YVYU:
fourcc = V4L2_PIX_FMT_YVYU;
break;
#endif
case GST_VIDEO_FORMAT_RGB15:
fourcc = V4L2_PIX_FMT_RGB555;
break;
case GST_VIDEO_FORMAT_RGB16:
fourcc = V4L2_PIX_FMT_RGB565;
break;
case GST_VIDEO_FORMAT_RGB:
fourcc = V4L2_PIX_FMT_RGB24;
break;
case GST_VIDEO_FORMAT_BGR:
fourcc = V4L2_PIX_FMT_BGR24;
break;
case GST_VIDEO_FORMAT_RGBx:
case GST_VIDEO_FORMAT_RGBA:
fourcc = V4L2_PIX_FMT_RGB32;
break;
case GST_VIDEO_FORMAT_BGRx:
case GST_VIDEO_FORMAT_BGRA:
fourcc = V4L2_PIX_FMT_BGR32;
break;
case GST_VIDEO_FORMAT_GRAY8:
fourcc = V4L2_PIX_FMT_GREY;
default:
break;
}
} else {
gboolean dimensions = TRUE;
/* no video caps, construct videoinfo ourselves */
gst_video_info_init (info);
if (g_str_equal (mimetype, "video/mpegts")) {
fourcc = V4L2_PIX_FMT_MPEG;
dimensions = FALSE;
} else if (g_str_equal (mimetype, "video/x-dv")) {
fourcc = V4L2_PIX_FMT_DV;
} else if (g_str_equal (mimetype, "image/jpeg")) {
fourcc = V4L2_PIX_FMT_JPEG;
#ifdef V4L2_PIX_FMT_SBGGR8
} else if (g_str_equal (mimetype, "video/x-raw-bayer")) {
fourcc = V4L2_PIX_FMT_SBGGR8;
#endif
#ifdef V4L2_PIX_FMT_SN9C10X
} else if (g_str_equal (mimetype, "video/x-sonix")) {
fourcc = V4L2_PIX_FMT_SN9C10X;
#endif
#ifdef V4L2_PIX_FMT_PWC1
} else if (g_str_equal (mimetype, "video/x-pwc1")) {
fourcc = V4L2_PIX_FMT_PWC1;
#endif
#ifdef V4L2_PIX_FMT_PWC2
} else if (g_str_equal (mimetype, "video/x-pwc2")) {
fourcc = V4L2_PIX_FMT_PWC2;
}
#endif
if (dimensions) {
gboolean interlaced;
if (!gst_structure_get_int (structure, "width", &info->width))
goto no_width;
if (!gst_structure_get_int (structure, "height", &info->height))
goto no_height;
if (!gst_structure_get_boolean (structure, "interlaced", &interlaced))
interlaced = FALSE;
if (interlaced)
info->flags |= GST_VIDEO_FLAG_INTERLACED;
if (!gst_structure_get_fraction (structure, "framerate", &info->fps_n,
&info->fps_d))
goto no_framerate;
}
}
if (fourcc == 0)
goto unhandled_format;
*format = gst_v4l2_object_get_format_from_fourcc (v4l2object, fourcc);
return TRUE;
/* ERRORS */
no_width:
{
GST_DEBUG_OBJECT (v4l2object, "no width");
return FALSE;
}
no_height:
{
GST_DEBUG_OBJECT (v4l2object, "no height");
return FALSE;
}
no_framerate:
{
GST_DEBUG_OBJECT (v4l2object, "no framerate");
return FALSE;
}
invalid_format:
{
GST_DEBUG_OBJECT (v4l2object, "invalid format");
return FALSE;
}
unhandled_format:
{
GST_DEBUG_OBJECT (v4l2object, "unhandled format");
return FALSE;
}
}
static gboolean
gst_v4l2_object_get_nearest_size (GstV4l2Object * v4l2object,
guint32 pixelformat, gint * width, gint * height, gboolean * interlaced);
/* 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, };
gboolean interlaced;
gint int_width = width;
gint int_height = height;
/* interlaced detection using VIDIOC_TRY/S_FMT */
if (!gst_v4l2_object_get_nearest_size (v4l2object, pixelformat,
&int_width, &int_height, &interlaced))
return NULL;
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,
"interlaced", G_TYPE_BOOLEAN, interlaced, 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
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;
gboolean interlaced;
/* 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, &interlaced)) {
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, &interlaced)) {
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->tv_norm && v4l2object->norms) {
GList *norms;
GstTunerNorm *norm = NULL;
GstTunerNorm *current =
gst_v4l2_tuner_get_norm_by_std_id (v4l2object, v4l2object->tv_norm);
for (norms = v4l2object->norms; norms != NULL; norms = norms->next) {
norm = (GstTunerNorm *) norms->data;
if (!strcmp (norm->label, current->label))
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_structure_set (tmp, "interlaced", G_TYPE_BOOLEAN, interlaced, 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, gboolean * interlaced)
{
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_NONE;
r = v4l2_ioctl (fd, VIDIOC_TRY_FMT, &fmt);
if (r < 0 && errno == EINVAL) {
/* try again with interlaced video */
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) {
/* 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;
switch (fmt.fmt.pix.field) {
case V4L2_FIELD_ANY:
case V4L2_FIELD_NONE:
*interlaced = FALSE;
break;
case V4L2_FIELD_INTERLACED:
case V4L2_FIELD_INTERLACED_TB:
case V4L2_FIELD_INTERLACED_BT:
*interlaced = TRUE;
break;
default:
GST_WARNING_OBJECT (v4l2object->element,
"Unsupported field type for %" GST_FOURCC_FORMAT "@%ux%u",
GST_FOURCC_ARGS (pixelformat), *width, *height);
return FALSE;
}
return TRUE;
}
static gboolean
gst_v4l2_object_setup_pool (GstV4l2Object * v4l2object)
{
GST_DEBUG_OBJECT (v4l2object->element, "initializing the capture system");
GST_V4L2_CHECK_OPEN (v4l2object);
GST_V4L2_CHECK_NOT_ACTIVE (v4l2object);
if (v4l2object->vcap.capabilities & V4L2_CAP_STREAMING) {
guint num_buffers;
GstStructure *config;
/* keep track of current number of buffers */
num_buffers = v4l2object->num_buffers;
/* Map the buffers */
GST_LOG_OBJECT (v4l2object->element, "initiating buffer pool");
if (!(v4l2object->pool = gst_v4l2_buffer_pool_new (v4l2object)))
goto buffer_pool_new_failed;
GST_INFO_OBJECT (v4l2object->element, "capturing buffers via mmap()");
v4l2object->use_mmap = TRUE;
config = gst_buffer_pool_get_config (v4l2object->pool);
gst_buffer_pool_config_set (config, NULL, 0, num_buffers, num_buffers,
0, 0);
gst_buffer_pool_set_config (v4l2object->pool, config);
if (!gst_buffer_pool_set_active (v4l2object->pool, TRUE))
goto activate_failed;
} else if (v4l2object->vcap.capabilities & V4L2_CAP_READWRITE) {
GST_INFO_OBJECT (v4l2object->element, "capturing buffers via read()");
v4l2object->use_mmap = FALSE;
v4l2object->pool = NULL;
} else {
goto no_supported_capture_method;
}
GST_V4L2_SET_ACTIVE (v4l2object);
return TRUE;
/* ERRORS */
buffer_pool_new_failed:
{
GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, READ,
(_("Could not map buffers from device '%s'"),
v4l2object->videodev),
("Failed to create buffer pool: %s", g_strerror (errno)));
return FALSE;
}
no_supported_capture_method:
{
GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, READ,
(_("The driver of device '%s' does not support any known capture "
"method."), v4l2object->videodev), (NULL));
return FALSE;
}
activate_failed:
{
GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, READ,
(_("Could not map buffers from device '%s'"),
v4l2object->videodev),
("Failed to activate buffer pool: %s", g_strerror (errno)));
return FALSE;
}
}
/* Note about fraction simplification
* * n1/d1 == n2/d2 is also written as n1 == ( n2 * d1 ) / d2
* */
#define fractions_are_equal(n1,d1,n2,d2) ((n1) == gst_util_uint64_scale_int((n2), (d1), (d2)))
gboolean
gst_v4l2_object_set_format (GstV4l2Object * v4l2object, GstCaps * caps)
{
gint fd = v4l2object->video_fd;
struct v4l2_format format;
struct v4l2_streamparm streamparm;
enum v4l2_field field;
guint32 pixelformat;
struct v4l2_fmtdesc *fmtdesc;
GstVideoInfo info;
gint width, height, fps_n, fps_d, stride;
if (!gst_v4l2_object_get_caps_info (v4l2object, caps, &fmtdesc, &info))
goto invalid_caps;
pixelformat = fmtdesc->pixelformat;
width = GST_VIDEO_INFO_WIDTH (&info);
height = GST_VIDEO_INFO_HEIGHT (&info);
fps_n = GST_VIDEO_INFO_FPS_N (&info);
fps_d = GST_VIDEO_INFO_FPS_D (&info);
stride = GST_VIDEO_INFO_PLANE_STRIDE (&info, 0);
if (info.flags & GST_VIDEO_FLAG_INTERLACED) {
GST_DEBUG_OBJECT (v4l2object->element, "interlaced video");
/* ideally we would differentiate between types of interlaced video
* but there is not sufficient information in the caps..
*/
field = V4L2_FIELD_INTERLACED;
} else {
GST_DEBUG_OBJECT (v4l2object->element, "progressive video");
field = V4L2_FIELD_NONE;
}
GST_DEBUG_OBJECT (v4l2object->element, "Desired format %dx%d, format "
"%" GST_FOURCC_FORMAT, width, height, GST_FOURCC_ARGS (pixelformat));
GST_V4L2_CHECK_OPEN (v4l2object);
GST_V4L2_CHECK_NOT_ACTIVE (v4l2object);
/* Only unconditionally accept mpegts for sources */
if ((v4l2object->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) &&
(pixelformat == GST_MAKE_FOURCC ('M', 'P', 'E', 'G')))
goto done;
memset (&format, 0x00, sizeof (struct v4l2_format));
format.type = v4l2object->type;
if (v4l2_ioctl (fd, VIDIOC_G_FMT, &format) < 0)
goto get_fmt_failed;
GST_DEBUG_OBJECT (v4l2object->element, "Got format to %dx%d, format "
"%" GST_FOURCC_FORMAT " bytesperline %d", format.fmt.pix.width,
format.fmt.pix.height, GST_FOURCC_ARGS (format.fmt.pix.pixelformat),
format.fmt.pix.bytesperline);
if (format.type != v4l2object->type ||
format.fmt.pix.width != width ||
format.fmt.pix.height != height ||
format.fmt.pix.pixelformat != pixelformat ||
format.fmt.pix.field != field || format.fmt.pix.bytesperline != stride) {
/* something different, set the format */
GST_DEBUG_OBJECT (v4l2object->element, "Setting format to %dx%d, format "
"%" GST_FOURCC_FORMAT " bytesperline %d", width, height,
GST_FOURCC_ARGS (pixelformat), stride);
format.type = v4l2object->type;
format.fmt.pix.width = width;
format.fmt.pix.height = height;
format.fmt.pix.pixelformat = pixelformat;
format.fmt.pix.field = field;
/* try to ask our prefered stride */
format.fmt.pix.bytesperline = stride;
if (v4l2_ioctl (fd, VIDIOC_S_FMT, &format) < 0)
goto set_fmt_failed;
GST_DEBUG_OBJECT (v4l2object->element, "Got format to %dx%d, format "
"%" GST_FOURCC_FORMAT " stride %d", format.fmt.pix.width,
format.fmt.pix.height, GST_FOURCC_ARGS (format.fmt.pix.pixelformat),
format.fmt.pix.bytesperline);
if (format.fmt.pix.width != width || format.fmt.pix.height != height)
goto invalid_dimensions;
if (format.fmt.pix.pixelformat != pixelformat)
goto invalid_pixelformat;
v4l2object->bytesperline = format.fmt.pix.bytesperline;
}
/* Is there a reason we require the caller to always specify a framerate? */
GST_DEBUG_OBJECT (v4l2object->element, "Desired framerate: %u/%u", fps_n,
fps_d);
memset (&streamparm, 0x00, sizeof (struct v4l2_streamparm));
streamparm.type = v4l2object->type;
if (v4l2_ioctl (fd, VIDIOC_G_PARM, &streamparm) < 0)
goto get_parm_failed;
GST_VIDEO_INFO_FPS_N (&info) =
streamparm.parm.capture.timeperframe.denominator;
GST_VIDEO_INFO_FPS_D (&info) = streamparm.parm.capture.timeperframe.numerator;
if (v4l2object->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
GST_DEBUG_OBJECT (v4l2object->element, "Got framerate: %u/%u",
streamparm.parm.capture.timeperframe.denominator,
streamparm.parm.capture.timeperframe.numerator);
/* Note: V4L2 provides the frame interval, we have the frame rate */
if (!fractions_are_equal (streamparm.parm.capture.timeperframe.numerator,
streamparm.parm.capture.timeperframe.denominator, fps_d, fps_n)) {
GST_LOG_OBJECT (v4l2object->element, "Setting framerate to %u/%u", fps_n,
fps_d);
/* We want to change the frame rate, so check whether we can. Some cheap USB
* cameras don't have the capability */
if ((streamparm.parm.capture.capability & V4L2_CAP_TIMEPERFRAME) == 0) {
GST_DEBUG_OBJECT (v4l2object->element,
"Not setting framerate (not supported)");
goto done;
}
/* Note: V4L2 wants the frame interval, we have the frame rate */
streamparm.parm.capture.timeperframe.numerator = fps_d;
streamparm.parm.capture.timeperframe.denominator = fps_n;
/* some cheap USB cam's won't accept any change */
if (v4l2_ioctl (fd, VIDIOC_S_PARM, &streamparm) < 0)
goto set_parm_failed;
/* get new values */
fps_d = streamparm.parm.capture.timeperframe.numerator;
fps_n = streamparm.parm.capture.timeperframe.denominator;
GST_INFO_OBJECT (v4l2object->element, "Set framerate to %u/%u", fps_n,
fps_d);
GST_VIDEO_INFO_FPS_N (&info) = fps_n;
GST_VIDEO_INFO_FPS_D (&info) = fps_d;
}
}
done:
/* if we have a framerate pre-calculate duration */
if (fps_n > 0 && fps_d > 0) {
v4l2object->duration = gst_util_uint64_scale_int (GST_SECOND, fps_d, fps_n);
} else {
v4l2object->duration = GST_CLOCK_TIME_NONE;
}
v4l2object->info = info;
v4l2object->fmtdesc = fmtdesc;
/* now configure ther pools */
if (!gst_v4l2_object_setup_pool (v4l2object))
goto pool_failed;
return TRUE;
/* ERRORS */
invalid_caps:
{
GST_DEBUG_OBJECT (v4l2object->element, "can't parse caps %" GST_PTR_FORMAT,
caps);
return FALSE;
}
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;
}
get_parm_failed:
{
/* it's possible that this call is not supported */
if (errno != EINVAL) {
GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
(_("Could not get parameters on device '%s'"),
v4l2object->videodev), GST_ERROR_SYSTEM);
}
goto done;
}
set_parm_failed:
{
GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
(_("Video device did not accept new frame rate setting.")),
GST_ERROR_SYSTEM);
goto done;
}
pool_failed:
{
GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, SETTINGS,
(_("Video device could not create buffer pool.")), GST_ERROR_SYSTEM);
return FALSE;
}
}
gboolean
gst_v4l2_object_start (GstV4l2Object * v4l2object)
{
GST_DEBUG_OBJECT (v4l2object->element, "starting");
GST_V4L2_CHECK_OPEN (v4l2object);
GST_V4L2_CHECK_ACTIVE (v4l2object);
if (v4l2object->pool)
if (!gst_buffer_pool_set_active (v4l2object->pool, TRUE))
goto activate_failed;
if (v4l2object->use_mmap) {
switch (v4l2object->type) {
case V4L2_BUF_TYPE_VIDEO_CAPTURE:
break;
case V4L2_BUF_TYPE_VIDEO_OUTPUT:
/* for output, we assume we already queued a buffer */
break;
default:
break;
}
if (!v4l2object->streaming) {
GST_DEBUG_OBJECT (v4l2object->element, "STREAMON");
if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_STREAMON,
&(v4l2object->type)) < 0)
goto start_failed;
v4l2object->streaming = TRUE;
}
}
return TRUE;
/* ERRORS */
activate_failed:
{
GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, OPEN_READ,
(_("Error starting bufferpool")), (NULL));
return FALSE;
}
start_failed:
{
GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, OPEN_READ,
(_("Error starting streaming on device '%s'."), v4l2object->videodev),
GST_ERROR_SYSTEM);
return FALSE;
}
}
gboolean
gst_v4l2_object_stop (GstV4l2Object * v4l2object)
{
GST_DEBUG_OBJECT (v4l2object->element, "stopping");
if (!GST_V4L2_IS_OPEN (v4l2object))
goto done;
if (!GST_V4L2_IS_ACTIVE (v4l2object))
goto done;
if (v4l2object->use_mmap) {
if (v4l2object->streaming) {
/* we actually need to sync on all queued buffers but not
* on the non-queued ones */
GST_DEBUG_OBJECT (v4l2object->element, "STREAMOFF");
if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_STREAMOFF,
&(v4l2object->type)) < 0)
goto stop_failed;
v4l2object->streaming = FALSE;
}
}
if (v4l2object->pool) {
GST_DEBUG_OBJECT (v4l2object->element, "deactivating pool");
gst_buffer_pool_set_active (v4l2object->pool, FALSE);
gst_object_unref (v4l2object->pool);
v4l2object->pool = NULL;
}
GST_V4L2_SET_INACTIVE (v4l2object);
done:
return TRUE;
/* ERRORS */
stop_failed:
{
GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, OPEN_READ,
(_("Error stopping streaming on device '%s'."), v4l2object->videodev),
GST_ERROR_SYSTEM);
return FALSE;
}
}
static GstFlowReturn
gst_v4l2_object_get_read (GstV4l2Object * v4l2object, GstBuffer ** buf)
{
GstFlowReturn res;
gint amount;
gint ret;
gpointer data;
gint buffersize;
buffersize = v4l2object->size;
/* In case the size per frame is unknown assume it's a streaming format (e.g.
* mpegts) and grab a reasonable default size instead */
if (buffersize == 0)
buffersize = 4096;
*buf = gst_buffer_new_and_alloc (buffersize);
data = gst_buffer_map (*buf, NULL, NULL, GST_MAP_WRITE);
do {
ret = gst_poll_wait (v4l2object->poll, GST_CLOCK_TIME_NONE);
if (G_UNLIKELY (ret < 0)) {
if (errno == EBUSY)
goto stopped;
if (errno == ENXIO) {
GST_DEBUG_OBJECT (v4l2object->element,
"v4l2 device doesn't support polling. Disabling");
v4l2object->can_poll_device = FALSE;
} else {
if (errno != EAGAIN && errno != EINTR)
goto select_error;
}
}
amount = v4l2_read (v4l2object->video_fd, data, buffersize);
if (amount == buffersize) {
break;
} else if (amount == -1) {
if (errno == EAGAIN || errno == EINTR) {
continue;
} else
goto read_error;
} else {
/* short reads can happen if a signal interrupts the read */
continue;
}
} while (TRUE);
gst_buffer_unmap (*buf, data, amount);
return GST_FLOW_OK;
/* ERRORS */
select_error:
{
GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, READ, (NULL),
("select error %d: %s (%d)", ret, g_strerror (errno), errno));
res = GST_FLOW_ERROR;
goto cleanup;
}
stopped:
{
GST_DEBUG ("stop called");
res = GST_FLOW_WRONG_STATE;
goto cleanup;
}
read_error:
{
GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, READ,
(_("Error reading %d bytes from device '%s'."),
buffersize, v4l2object->videodev), GST_ERROR_SYSTEM);
res = GST_FLOW_ERROR;
goto cleanup;
}
cleanup:
{
gst_buffer_unmap (*buf, data, 0);
gst_buffer_unref (*buf);
return res;
}
}
static GstFlowReturn
gst_v4l2_object_get_mmap (GstV4l2Object * v4l2object, GstBuffer ** buf)
{
GstFlowReturn res;
#define NUM_TRIALS 50
GstBufferPool *pool;
gint32 trials = NUM_TRIALS;
GstBuffer *pool_buffer;
gboolean need_copy;
gint ret;
pool = v4l2object->pool;
if (!pool)
goto no_buffer_pool;
GST_DEBUG_OBJECT (v4l2object->element, "grab frame");
for (;;) {
if (v4l2object->can_poll_device) {
ret = gst_poll_wait (v4l2object->poll, GST_CLOCK_TIME_NONE);
if (G_UNLIKELY (ret < 0)) {
if (errno == EBUSY)
goto stopped;
if (errno == ENXIO) {
GST_DEBUG_OBJECT (v4l2object->element,
"v4l2 device doesn't support polling. Disabling");
v4l2object->can_poll_device = FALSE;
} else {
if (errno != EAGAIN && errno != EINTR)
goto select_error;
}
}
}
res = gst_buffer_pool_acquire_buffer (pool, &pool_buffer, NULL);
if (res != GST_FLOW_OK)
goto no_buffer;
if (v4l2object->size > 0) {
gsize size = gst_buffer_get_size (pool_buffer);
/* if size does not match what we expected, try again */
if (size != v4l2object->size) {
GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, READ,
(_("Got unexpected frame size of %u instead of %u."),
size, v4l2object->size), (NULL));
gst_buffer_unref (pool_buffer);
goto no_buffer;
}
}
/* when we get here all is fine */
break;
no_buffer:
GST_WARNING_OBJECT (v4l2object->element, "trials=%d", trials);
/* if the sync() got interrupted, we can retry */
switch (errno) {
case EINVAL:
case ENOMEM:
/* fatal */
return GST_FLOW_ERROR;
case EAGAIN:
case EIO:
case EINTR:
default:
/* try again, until too many trials */
break;
}
/* check nr. of attempts to capture */
if (--trials == -1) {
goto too_many_trials;
}
}
/* if we are handing out the last buffer in the pool, we need to make a
* copy and bring the buffer back in the pool. */
need_copy = v4l2object->always_copy
|| !gst_v4l2_buffer_pool_available_buffers (pool);
if (G_UNLIKELY (need_copy)) {
if (!v4l2object->always_copy) {
GST_CAT_LOG_OBJECT (GST_CAT_PERFORMANCE, v4l2object->element,
"running out of buffers, making a copy to reuse current one");
}
*buf = gst_buffer_copy (pool_buffer);
/* this will requeue */
gst_buffer_unref (pool_buffer);
} else {
*buf = pool_buffer;
}
return GST_FLOW_OK;
/* ERRORS */
no_buffer_pool:
{
GST_DEBUG_OBJECT (v4l2object->element, "no buffer pool");
return GST_FLOW_WRONG_STATE;
}
select_error:
{
GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, READ, (NULL),
("select error %d: %s (%d)", ret, g_strerror (errno), errno));
return GST_FLOW_ERROR;
}
stopped:
{
GST_DEBUG ("stop called");
return GST_FLOW_WRONG_STATE;
}
too_many_trials:
{
GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, FAILED,
(_("Failed trying to get video frames from device '%s'."),
v4l2object->videodev),
(_("Failed after %d tries. device %s. system error: %s"),
NUM_TRIALS, v4l2object->videodev, g_strerror (errno)));
return GST_FLOW_ERROR;
}
}
GstFlowReturn
gst_v4l2_object_get_buffer (GstV4l2Object * v4l2object, GstBuffer ** buf)
{
GstFlowReturn ret;
switch (v4l2object->type) {
case V4L2_BUF_TYPE_VIDEO_CAPTURE:
if (v4l2object->use_mmap) {
ret = gst_v4l2_object_get_mmap (v4l2object, buf);
} else {
ret = gst_v4l2_object_get_read (v4l2object, buf);
}
break;
case V4L2_BUF_TYPE_VIDEO_OUTPUT:
ret = gst_buffer_pool_acquire_buffer (v4l2object->pool, buf, NULL);
break;
default:
ret = GST_FLOW_ERROR;
break;
}
return ret;
}
GstFlowReturn
gst_v4l2_object_output_buffer (GstV4l2Object * v4l2object, GstBuffer * buf)
{
GstFlowReturn ret;
GstBuffer *newbuf = NULL;
GstMetaV4l2 *meta;
meta = GST_META_V4L2_GET (buf);
if (meta == NULL || buf->pool != v4l2object->pool) {
guint8 *data;
gsize size;
/* not our buffer */
GST_DEBUG_OBJECT (v4l2object->element, "slow-path.. need to memcpy");
ret = gst_buffer_pool_acquire_buffer (v4l2object->pool, &newbuf, NULL);
if (ret != GST_FLOW_OK)
goto acquire_failed;
if (v4l2object->info.finfo) {
GstVideoFrame src_frame, dest_frame;
GST_DEBUG_OBJECT (v4l2object->element, "copy video frame");
/* we have raw video, use videoframe copy to get strides right */
gst_video_frame_map (&src_frame, &v4l2object->info, buf, GST_MAP_READ);
gst_video_frame_map (&dest_frame, &v4l2object->info, newbuf,
GST_MAP_WRITE);
gst_video_frame_copy (&dest_frame, &src_frame);
gst_video_frame_unmap (&src_frame);
gst_video_frame_unmap (&dest_frame);
} else {
GST_DEBUG_OBJECT (v4l2object->element, "copy raw bytes");
data = gst_buffer_map (buf, &size, NULL, GST_MAP_READ);
gst_buffer_fill (newbuf, 0, data, size);
gst_buffer_unmap (buf, data, size);
}
GST_DEBUG_OBJECT (v4l2object->element, "render copied buffer: %p", newbuf);
buf = newbuf;
}
if (!gst_v4l2_buffer_pool_qbuf (v4l2object->pool, buf))
goto queue_failed;
if (!v4l2object->streaming) {
if (!gst_v4l2_object_start (v4l2object)) {
return GST_FLOW_ERROR;
}
}
if (!newbuf)
gst_buffer_ref (buf);
#if 0
/* if the driver has more than one buffer, ie. more than just the one we
* just queued, then dequeue one immediately to make it available via
* _buffer_alloc():
*/
if (gst_v4l2_buffer_pool_available_buffers (v4l2object->pool) >
v4l2object->min_queued_bufs) {
GstBuffer *v4l2buf = gst_v4l2_buffer_pool_dqbuf (v4l2object->pool);
/* note: if we get a buf, we don't want to use it directly (because
* someone else could still hold a ref).. but instead we release our
* reference to it, and if no one else holds a ref it will be returned
* to the pool of available buffers.. and if not, we keep looping.
*/
if (v4l2buf) {
gst_buffer_unref (v4l2buf);
}
}
#endif
return GST_FLOW_OK;
/* ERRORS */
acquire_failed:
{
GST_DEBUG_OBJECT (v4l2object->element, "could not get buffer from pool");
return ret;
}
queue_failed:
{
GST_DEBUG_OBJECT (v4l2object->element, "failed to queue buffer");
return GST_FLOW_ERROR;
}
}
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