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gstreamer/sys/v4l2/gstv4l2src.c
Stefan Kost 77790aa2dc sys/v4l2/: More FIXME comments and messaging changes. 
Original commit message from CVS:
* sys/v4l2/gstv4l2src.c: (gst_v4l2src_v4l2fourcc_to_caps),
(gst_v4l2src_get_caps):
* sys/v4l2/v4l2src_calls.c: (gst_v4l2src_fill_format_list),
(gst_v4l2src_grab_frame), (gst_v4l2src_set_capture),
(gst_v4l2src_capture_init):
More FIXME comments and messaging changes.
2007-02-12 12:57:22 +00:00

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/* GStreamer
*
* Copyright (C) 2001-2002 Ronald Bultje <rbultje@ronald.bitfreak.net>
* 2006 Edgard Lima <edgard.lima@indt.org.br>
*
* gstv4l2src.c: Video4Linux2 source element
*
* 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.
*/
/**
* SECTION:element-v4l2src
*
* <refsect2>
* v4l2src can be used to capture video from v4l2 devices, like webcams and tv cards.
* <title>Example launch line</title>
* <para>
* <programlisting>
* gst-launch v4l2src ! xvimagesink
* </programlisting>
* This pipeline shows the video captured from /dev/video0 tv card and for
* webcams.
* </para>
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <string.h>
#include <sys/time.h>
#include "v4l2src_calls.h"
#include <unistd.h>
#include "gstv4l2colorbalance.h"
#include "gstv4l2tuner.h"
#include "gstv4l2xoverlay.h"
#include "gstv4l2vidorient.h"
static const GstElementDetails gst_v4l2src_details =
GST_ELEMENT_DETAILS ("Video (video4linux2/raw) Source",
"Source/Video",
"Reads raw frames from a video4linux2 (BT8x8) device",
"Ronald Bultje <rbultje@ronald.bitfreak.net>,"
" Edgard Lima <edgard.lima@indt.org.br>");
GST_DEBUG_CATEGORY (v4l2src_debug);
#define GST_CAT_DEFAULT v4l2src_debug
enum
{
PROP_0,
V4L2_STD_OBJECT_PROPS,
PROP_QUEUE_SIZE
};
static const guint32 gst_v4l2_formats[] = {
/* from Linux 2.6.15 videodev2.h */
V4L2_PIX_FMT_RGB332,
V4L2_PIX_FMT_RGB555,
V4L2_PIX_FMT_RGB565,
V4L2_PIX_FMT_RGB555X,
V4L2_PIX_FMT_RGB565X,
V4L2_PIX_FMT_BGR24,
V4L2_PIX_FMT_RGB24,
V4L2_PIX_FMT_BGR32,
V4L2_PIX_FMT_RGB32,
V4L2_PIX_FMT_GREY,
V4L2_PIX_FMT_YVU410,
V4L2_PIX_FMT_YVU420,
V4L2_PIX_FMT_YUYV,
V4L2_PIX_FMT_UYVY,
V4L2_PIX_FMT_YUV422P,
V4L2_PIX_FMT_YUV411P,
V4L2_PIX_FMT_Y41P,
/* two planes -- one Y, one Cr + Cb interleaved */
V4L2_PIX_FMT_NV12,
V4L2_PIX_FMT_NV21,
/* The following formats are not defined in the V4L2 specification */
V4L2_PIX_FMT_YUV410,
V4L2_PIX_FMT_YUV420,
V4L2_PIX_FMT_YYUV,
V4L2_PIX_FMT_HI240,
/* see http://www.siliconimaging.com/RGB%20Bayer.htm */
#ifdef V4L2_PIX_FMT_SBGGR8
V4L2_PIX_FMT_SBGGR8,
#endif
/* compressed formats */
V4L2_PIX_FMT_MJPEG,
V4L2_PIX_FMT_JPEG,
V4L2_PIX_FMT_DV,
V4L2_PIX_FMT_MPEG,
/* Vendor-specific formats */
V4L2_PIX_FMT_WNVA,
#ifdef V4L2_PIX_FMT_SN9C10X
V4L2_PIX_FMT_SN9C10X,
#endif
#ifdef V4L2_PIX_FMT_PWC1
V4L2_PIX_FMT_PWC1,
#endif
#ifdef V4L2_PIX_FMT_PWC2
V4L2_PIX_FMT_PWC2,
#endif
};
#define GST_V4L2_FORMAT_COUNT (G_N_ELEMENTS (gst_v4l2_formats))
GST_IMPLEMENT_V4L2_PROBE_METHODS (GstV4l2SrcClass, gst_v4l2src);
GST_IMPLEMENT_V4L2_COLOR_BALANCE_METHODS (GstV4l2Src, gst_v4l2src);
GST_IMPLEMENT_V4L2_TUNER_METHODS (GstV4l2Src, gst_v4l2src);
#if 0 /* overlay is still not implemented #ifdef HAVE_XVIDEO */
GST_IMPLEMENT_V4L2_XOVERLAY_METHODS (GstV4l2Src, gst_v4l2src);
#endif
GST_IMPLEMENT_V4L2_VIDORIENT_METHODS (GstV4l2Src, gst_v4l2src);
static gboolean
gst_v4l2src_iface_supported (GstImplementsInterface * iface, GType iface_type)
{
GstV4l2Object *v4l2object = GST_V4L2SRC (iface)->v4l2object;
#if 0 /* overlay is still not implemented #ifdef HAVE_XVIDEO */
g_assert (iface_type == GST_TYPE_TUNER ||
iface_type == GST_TYPE_X_OVERLAY ||
iface_type == GST_TYPE_COLOR_BALANCE ||
iface_type == GST_TYPE_VIDEO_ORIENTATION);
#else
g_assert (iface_type == GST_TYPE_TUNER ||
iface_type == GST_TYPE_COLOR_BALANCE ||
iface_type == GST_TYPE_VIDEO_ORIENTATION);
#endif
if (v4l2object->video_fd == -1)
return FALSE;
#if 0 /* overlay is still not implemented #ifdef HAVE_XVIDEO */
if (iface_type == GST_TYPE_X_OVERLAY && !GST_V4L2_IS_OVERLAY (v4l2object))
return FALSE;
#endif
return TRUE;
}
static void
gst_v4l2src_interface_init (GstImplementsInterfaceClass * klass)
{
/*
* default virtual functions
*/
klass->supported = gst_v4l2src_iface_supported;
}
void
gst_v4l2src_init_interfaces (GType type)
{
static const GInterfaceInfo v4l2iface_info = {
(GInterfaceInitFunc) gst_v4l2src_interface_init,
NULL,
NULL,
};
static const GInterfaceInfo v4l2_tuner_info = {
(GInterfaceInitFunc) gst_v4l2src_tuner_interface_init,
NULL,
NULL,
};
#if 0 /* overlay is still not implemented #ifdef HAVE_XVIDEO */
static const GInterfaceInfo v4l2_xoverlay_info = {
(GInterfaceInitFunc) gst_v4l2src_xoverlay_interface_init,
NULL,
NULL,
};
#endif
static const GInterfaceInfo v4l2_colorbalance_info = {
(GInterfaceInitFunc) gst_v4l2src_color_balance_interface_init,
NULL,
NULL,
};
static const GInterfaceInfo v4l2_videoorientation_info = {
(GInterfaceInitFunc) gst_v4l2src_video_orientation_interface_init,
NULL,
NULL,
};
static const GInterfaceInfo v4l2_propertyprobe_info = {
(GInterfaceInitFunc) gst_v4l2src_property_probe_interface_init,
NULL,
NULL,
};
g_type_add_interface_static (type,
GST_TYPE_IMPLEMENTS_INTERFACE, &v4l2iface_info);
g_type_add_interface_static (type, GST_TYPE_TUNER, &v4l2_tuner_info);
#if 0 /* overlay is still not implemented #ifdef HAVE_XVIDEO */
g_type_add_interface_static (type, GST_TYPE_X_OVERLAY, &v4l2_xoverlay_info);
#endif
g_type_add_interface_static (type,
GST_TYPE_COLOR_BALANCE, &v4l2_colorbalance_info);
g_type_add_interface_static (type,
GST_TYPE_VIDEO_ORIENTATION, &v4l2_videoorientation_info);
g_type_add_interface_static (type, GST_TYPE_PROPERTY_PROBE,
&v4l2_propertyprobe_info);
}
GST_BOILERPLATE_FULL (GstV4l2Src, gst_v4l2src, GstPushSrc, GST_TYPE_PUSH_SRC,
gst_v4l2src_init_interfaces);
static void gst_v4l2src_dispose (GObject * object);
/* basesrc methods */
static gboolean gst_v4l2src_start (GstBaseSrc * src);
static gboolean gst_v4l2src_stop (GstBaseSrc * src);
static gboolean gst_v4l2src_set_caps (GstBaseSrc * src, GstCaps * caps);
static GstCaps *gst_v4l2src_get_caps (GstBaseSrc * src);
static GstFlowReturn gst_v4l2src_create (GstPushSrc * src, GstBuffer ** out);
static void gst_v4l2src_fixate (GstPad * pad, GstCaps * caps);
static void gst_v4l2src_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_v4l2src_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static GstCaps *gst_v4l2src_get_all_caps (void);
static void
gst_v4l2src_base_init (gpointer g_class)
{
GstElementClass *gstelement_class = GST_ELEMENT_CLASS (g_class);
GstV4l2SrcClass *gstv4l2src_class = GST_V4L2SRC_CLASS (g_class);
gstv4l2src_class->v4l2_class_devices = NULL;
GST_DEBUG_CATEGORY_INIT (v4l2src_debug, "v4l2src", 0, "V4L2 source element");
gst_element_class_set_details (gstelement_class, &gst_v4l2src_details);
gst_element_class_add_pad_template
(gstelement_class,
gst_pad_template_new ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
gst_v4l2src_get_all_caps ()));
}
static void
gst_v4l2src_class_init (GstV4l2SrcClass * klass)
{
GObjectClass *gobject_class;
GstBaseSrcClass *basesrc_class;
GstPushSrcClass *pushsrc_class;
gobject_class = G_OBJECT_CLASS (klass);
basesrc_class = GST_BASE_SRC_CLASS (klass);
pushsrc_class = GST_PUSH_SRC_CLASS (klass);
gobject_class->dispose = gst_v4l2src_dispose;
gobject_class->set_property = gst_v4l2src_set_property;
gobject_class->get_property = gst_v4l2src_get_property;
gst_v4l2_object_install_properties_helper (gobject_class);
g_object_class_install_property (gobject_class, PROP_QUEUE_SIZE,
g_param_spec_uint ("queue-size", "Queue size",
"Number of buffers to be enqueud in the driver",
GST_V4L2_MIN_BUFFERS, GST_V4L2_MAX_BUFFERS, GST_V4L2_MIN_BUFFERS,
G_PARAM_READWRITE));
basesrc_class->get_caps = gst_v4l2src_get_caps;
basesrc_class->set_caps = gst_v4l2src_set_caps;
basesrc_class->start = gst_v4l2src_start;
basesrc_class->stop = gst_v4l2src_stop;
pushsrc_class->create = gst_v4l2src_create;
}
static void
gst_v4l2src_init (GstV4l2Src * v4l2src, GstV4l2SrcClass * klass)
{
v4l2src->v4l2object = gst_v4l2_object_new (GST_ELEMENT (v4l2src),
gst_v4l2_get_input, gst_v4l2_set_input, gst_v4l2src_update_fps);
/* number of buffers requested */
v4l2src->breq.count = 0;
v4l2src->formats = NULL;
/* fps */
v4l2src->fps_n = 0;
v4l2src->fps_d = 1;
v4l2src->is_capturing = FALSE;
gst_pad_set_fixatecaps_function (GST_BASE_SRC_PAD (v4l2src),
gst_v4l2src_fixate);
gst_base_src_set_format (GST_BASE_SRC (v4l2src), GST_FORMAT_TIME);
gst_base_src_set_live (GST_BASE_SRC (v4l2src), TRUE);
}
static void
gst_v4l2src_dispose (GObject * object)
{
GstV4l2Src *v4l2src = GST_V4L2SRC (object);
if (v4l2src->formats) {
gst_v4l2src_clear_format_list (v4l2src);
}
G_OBJECT_CLASS (parent_class)->dispose (object);
}
static void
gst_v4l2src_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec)
{
GstV4l2Src *v4l2src;
g_return_if_fail (GST_IS_V4L2SRC (object));
v4l2src = GST_V4L2SRC (object);
if (!gst_v4l2_object_set_property_helper (v4l2src->v4l2object,
prop_id, value, pspec)) {
switch (prop_id) {
case PROP_QUEUE_SIZE:
v4l2src->breq.count = g_value_get_uint (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
}
static void
gst_v4l2src_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec)
{
GstV4l2Src *v4l2src;
g_return_if_fail (GST_IS_V4L2SRC (object));
v4l2src = GST_V4L2SRC (object);
if (!gst_v4l2_object_get_property_helper (v4l2src->v4l2object,
prop_id, value, pspec)) {
switch (prop_id) {
case PROP_QUEUE_SIZE:
g_value_set_uint (value, v4l2src->breq.count);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
}
/* this function is a bit of a last resort */
static void
gst_v4l2src_fixate (GstPad * pad, GstCaps * caps)
{
GstStructure *structure;
gint i;
G_GNUC_UNUSED gchar *caps_str;
caps_str = gst_caps_to_string (caps);
GST_DEBUG_OBJECT (GST_PAD_PARENT (pad), "fixating caps %s", caps_str);
g_free (caps_str);
for (i = 0; i < gst_caps_get_size (caps); ++i) {
structure = gst_caps_get_structure (caps, i);
const GValue *v;
/* FIXME such sizes? we usually fixate to something in the 320x200
* range... */
/* We are fixating to greater possble size (limited to GST_V4L2_MAX_SIZE)
and framarate closer to 15/2 that is common in web-cams */
gst_structure_fixate_field_nearest_int (structure, "width",
GST_V4L2_MAX_SIZE);
gst_structure_fixate_field_nearest_int (structure, "height",
GST_V4L2_MAX_SIZE);
gst_structure_fixate_field_nearest_fraction (structure, "framerate", 15, 2);
v = gst_structure_get_value (structure, "format");
if (v && G_VALUE_TYPE (v) != GST_TYPE_FOURCC) {
guint32 fourcc;
g_return_if_fail (G_VALUE_TYPE (v) == GST_TYPE_LIST);
fourcc = gst_value_get_fourcc (gst_value_list_get_value (v, 0));
gst_structure_set (structure, "format", GST_TYPE_FOURCC, fourcc, NULL);
}
}
}
static GstStructure *
gst_v4l2src_v4l2fourcc_to_caps (guint32 fourcc)
{
GstStructure *structure = NULL;
/* FIXME: new FourCCs
camera: ZC0301 PC Camera
driver: zc0301
BA81, S910, PWC1, PWC2
camera:
driver:
*/
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 */
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 */
/* FIXME: get correct fourccs here */
break;
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:
case V4L2_PIX_FMT_YUV411P:{
guint32 fcc = 0;
switch (fourcc) {
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;
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 */
/* someone figure out the MPEG format used... */
break;
case V4L2_PIX_FMT_WNVA: /* Winnov hw compres */
break;
default:
GST_DEBUG ("Unknown fourcc 0x%08x %" GST_FOURCC_FORMAT,
fourcc, GST_FOURCC_ARGS (fourcc));
break;
}
return structure;
}
static guint32
gst_v4l2_fourcc_from_structure (GstStructure * structure)
{
guint32 fourcc = 0;
const gchar *mimetype = gst_structure_get_name (structure);
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;
break;
case GST_MAKE_FOURCC ('Y', 'U', 'Y', '2'):
fourcc = V4L2_PIX_FMT_YUYV;
break;
case GST_MAKE_FOURCC ('Y', '4', '1', 'P'):
fourcc = V4L2_PIX_FMT_Y41P;
break;
case GST_MAKE_FOURCC ('U', 'Y', 'V', 'Y'):
fourcc = V4L2_PIX_FMT_UYVY;
break;
case GST_MAKE_FOURCC ('Y', 'V', '1', '2'):
fourcc = V4L2_PIX_FMT_YVU420;
break;
case GST_MAKE_FOURCC ('Y', '4', '1', 'B'):
fourcc = V4L2_PIX_FMT_YUV411P;
break;
case GST_MAKE_FOURCC ('Y', '4', '2', 'B'):
fourcc = V4L2_PIX_FMT_YUV422P;
break;
}
} 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;
}
return fourcc;
}
static struct v4l2_fmtdesc *
gst_v4l2src_get_format_from_fourcc (GstV4l2Src * v4l2src, guint32 fourcc)
{
struct v4l2_fmtdesc *fmt;
GSList *walk;
if (fourcc == 0)
return NULL;
walk = v4l2src->formats;
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;
}
static struct v4l2_fmtdesc *
gst_v4l2_caps_to_v4l2fourcc (GstV4l2Src * v4l2src, GstStructure * structure)
{
return gst_v4l2src_get_format_from_fourcc (v4l2src,
gst_v4l2_fourcc_from_structure (structure));
}
static GstCaps *
gst_v4l2src_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_v4l2src_v4l2fourcc_to_caps (gst_v4l2_formats[i]);
if (structure) {
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 caps;
}
static GstCaps *
gst_v4l2src_get_caps (GstBaseSrc * src)
{
GstV4l2Src *v4l2src = GST_V4L2SRC (src);
GstCaps *caps;
struct v4l2_fmtdesc *format;
int min_w, max_w, min_h, max_h;
GSList *walk;
GstStructure *structure;
guint fps_n, fps_d;
if (!GST_V4L2_IS_OPEN (v4l2src->v4l2object)) {
return
gst_caps_copy (gst_pad_get_pad_template_caps (GST_BASE_SRC_PAD
(v4l2src)));
}
if (!v4l2src->formats)
gst_v4l2src_fill_format_list (v4l2src);
/* build our own capslist */
caps = gst_caps_new_empty ();
walk = v4l2src->formats;
if (!gst_v4l2src_get_fps (v4l2src, &fps_n, &fps_d)) {
GST_DEBUG_OBJECT (v4l2src, "frame rate is unknown.");
fps_n = 0;
fps_d = 1;
}
while (walk) {
format = (struct v4l2_fmtdesc *) walk->data;
walk = g_slist_next (walk);
/* get size delimiters */
if (!gst_v4l2src_get_size_limits (v4l2src, format,
&min_w, &max_w, &min_h, &max_h)) {
continue;
}
/* template, FIXME, why limit if the device reported correct results? */
/* we are doing it right now to avoid unexpected results */
min_w = CLAMP (min_w, 1, GST_V4L2_MAX_SIZE);
min_h = CLAMP (min_h, 1, GST_V4L2_MAX_SIZE);
max_w = CLAMP (max_w, min_w, GST_V4L2_MAX_SIZE);
max_h = CLAMP (max_h, min_h, GST_V4L2_MAX_SIZE);
/* add to list */
structure = gst_v4l2src_v4l2fourcc_to_caps (format->pixelformat);
if (structure) {
gst_structure_set (structure,
"width", GST_TYPE_INT_RANGE, min_w, max_w,
"height", GST_TYPE_INT_RANGE, min_h, max_h, NULL);
/* FIXME, why random range? */
/* AFAIK: in v4l2 standard we still don't have a good way to enum
for a range. Currently it is on discussion on v4l2 forum.
Currently, something more smart could be done for tvcard devices.
The maximum value could be determined by 'v4l2_standard.frameperiod'
and minimum also to the same if V4L2_CAP_TIMEPERFRAME is not set. */
/* another approach for web-cams would be to try to set a very
high(100/1) and low(1/1) FPSs and get the values returned */
gst_structure_set (structure, "framerate", GST_TYPE_FRACTION_RANGE,
0, 1, 100, 1, NULL);
gst_caps_append_structure (caps, structure);
}
}
GST_DEBUG_OBJECT (v4l2src, "returning caps: %" GST_PTR_FORMAT, caps);
return caps;
}
static gboolean
gst_v4l2src_set_caps (GstBaseSrc * src, GstCaps * caps)
{
GstV4l2Src *v4l2src;
gint w = 0, h = 0;
GstStructure *structure;
struct v4l2_fmtdesc *format;
const GValue *framerate;
guint fps_n, fps_d;
v4l2src = GST_V4L2SRC (src);
/* if we're not open, punt -- we'll get setcaps'd later via negotiate */
if (!GST_V4L2_IS_OPEN (v4l2src->v4l2object))
return FALSE;
/* make sure we stop capturing and dealloc buffers */
if (GST_V4L2_IS_ACTIVE (v4l2src->v4l2object)) {
/* both will throw an element-error on failure */
if (!gst_v4l2src_capture_stop (v4l2src))
return FALSE;
if (!gst_v4l2src_capture_deinit (v4l2src))
return FALSE;
}
structure = gst_caps_get_structure (caps, 0);
/* we want our own v4l2 type of fourcc codes */
if (!(format = gst_v4l2_caps_to_v4l2fourcc (v4l2src, structure))) {
GST_DEBUG_OBJECT (v4l2src, "can't get capture format from caps %"
GST_PTR_FORMAT, caps);
return FALSE;
}
gst_structure_get_int (structure, "width", &w);
gst_structure_get_int (structure, "height", &h);
framerate = gst_structure_get_value (structure, "framerate");
GST_DEBUG_OBJECT (v4l2src, "trying to set_capture %dx%d, format %s",
w, h, format->description);
if (framerate) {
fps_n = gst_value_get_fraction_numerator (framerate);
fps_d = gst_value_get_fraction_denominator (framerate);
} else {
fps_n = 0;
fps_d = 1;
}
if (!gst_v4l2src_set_capture (v4l2src, format, &w, &h, &fps_n, &fps_d)) {
GST_WARNING_OBJECT (v4l2src, "could not set_capture %dx%d, format %s",
w, h, format->description);
return FALSE;
}
if (fps_n) {
gst_structure_set (structure,
"width", G_TYPE_INT, w,
"height", G_TYPE_INT, h,
"framerate", GST_TYPE_FRACTION, fps_n, fps_d, NULL);
} else {
gst_structure_set (structure,
"width", G_TYPE_INT, w, "height", G_TYPE_INT, h, NULL);
}
if (!gst_v4l2src_capture_init (v4l2src))
return FALSE;
if (!gst_v4l2src_capture_start (v4l2src))
return FALSE;
if (v4l2src->fps_n != fps_n || v4l2src->fps_d != fps_d) {
GST_WARNING_OBJECT (v4l2src,
"framerate changed after start capturing from %u/%u to %u/%u", fps_n,
fps_d, v4l2src->fps_n, v4l2src->fps_d);
if (fps_n) {
gst_structure_set (structure,
"width", G_TYPE_INT, w,
"height", G_TYPE_INT, h,
"framerate", GST_TYPE_FRACTION, v4l2src->fps_n, v4l2src->fps_d, NULL);
}
}
return TRUE;
}
/* start and stop are not symmetric -- start will open the device, but not start
* capture. it's setcaps that will start capture, which is called via basesrc's
* negotiate method. stop will both stop capture and close the device.
*/
static gboolean
gst_v4l2src_start (GstBaseSrc * src)
{
GstV4l2Src *v4l2src = GST_V4L2SRC (src);
if (!gst_v4l2_object_start (v4l2src->v4l2object))
return FALSE;
v4l2src->offset = 0;
return TRUE;
}
static gboolean
gst_v4l2src_stop (GstBaseSrc * src)
{
GstV4l2Src *v4l2src = GST_V4L2SRC (src);
if (GST_V4L2_IS_ACTIVE (v4l2src->v4l2object)
&& !gst_v4l2src_capture_stop (v4l2src))
return FALSE;
if (v4l2src->v4l2object->buffer != NULL) {
if (!gst_v4l2src_capture_deinit (v4l2src))
return FALSE;
}
if (!gst_v4l2_object_stop (v4l2src->v4l2object))
return FALSE;
return TRUE;
}
static GstFlowReturn
gst_v4l2src_get_read (GstV4l2Src * v4l2src, GstBuffer ** buf)
{
gint amount;
gint buffersize;
buffersize = v4l2src->format.fmt.pix.sizeimage;
do {
*buf = gst_v4l2src_buffer_new (v4l2src, buffersize, NULL, NULL);
amount =
read (v4l2src->v4l2object->video_fd, GST_BUFFER_DATA (*buf),
buffersize);
if (amount == buffersize) {
break;
} else if (amount == -1) {
if (errno == EAGAIN || errno == EINTR) {
continue;
} else
goto read_error;
} else
goto short_read;
} while (TRUE);
return GST_FLOW_OK;
/* ERRORS */
read_error:
{
GST_ELEMENT_ERROR (v4l2src, RESOURCE, SYNC,
(_("Error read()ing %d bytes on device '%s'."),
buffersize, v4l2src->v4l2object->videodev), GST_ERROR_SYSTEM);
gst_buffer_unref (*buf);
return GST_FLOW_ERROR;
}
short_read:
{
GST_ELEMENT_ERROR (v4l2src, RESOURCE, SYNC,
(_("Error reading from device '%s'"),
v4l2src->v4l2object->videodev),
("Error read()ing a buffer on device %s: got only %d bytes instead of expected %d.",
v4l2src->v4l2object->videodev, amount, buffersize));
gst_buffer_unref (*buf);
return GST_FLOW_ERROR;
}
}
static GstFlowReturn
gst_v4l2src_get_mmap (GstV4l2Src * v4l2src, GstBuffer ** buf)
{
gint i, num;
/* grab a frame from the device, post an error */
num = gst_v4l2src_grab_frame (v4l2src);
if (num == -1)
goto grab_failed;
i = v4l2src->format.fmt.pix.sizeimage;
/* check if this is the last buffer in the queue. If so do a memcpy to put it back asap
to avoid framedrops and deadlocks because of stupid elements */
if (g_atomic_int_get (&v4l2src->pool->refcount) == v4l2src->breq.count) {
GST_LOG_OBJECT (v4l2src, "using memcpy'd buffer");
*buf = gst_v4l2src_buffer_new (v4l2src, i, NULL, NULL);
memcpy (GST_BUFFER_DATA (*buf), v4l2src->pool->buffers[num].start, i);
/* posts an error message if something went wrong */
if (!gst_v4l2src_queue_frame (v4l2src, num))
goto queue_failed;
} else {
GST_LOG_OBJECT (v4l2src, "using mmap'd buffer");
*buf =
gst_v4l2src_buffer_new (v4l2src, i, v4l2src->pool->buffers[num].start,
&v4l2src->pool->buffers[num]);
/* no need to be careful here, both are > 0, because the element uses them */
g_atomic_int_inc (&v4l2src->pool->buffers[num].refcount);
g_atomic_int_inc (&v4l2src->pool->refcount);
}
return GST_FLOW_OK;
/* ERRORS */
grab_failed:
{
GST_DEBUG_OBJECT (v4l2src, "failed to grab a frame");
return GST_FLOW_ERROR;
}
queue_failed:
{
GST_DEBUG_OBJECT (v4l2src, "failed to queue frame");
gst_buffer_unref (*buf);
return GST_FLOW_ERROR;
}
}
static GstFlowReturn
gst_v4l2src_create (GstPushSrc * src, GstBuffer ** buf)
{
GstV4l2Src *v4l2src = GST_V4L2SRC (src);
GstFlowReturn ret;
if (v4l2src->breq.memory == V4L2_MEMORY_MMAP) {
ret = gst_v4l2src_get_mmap (v4l2src, buf);
} else {
ret = gst_v4l2src_get_read (v4l2src, buf);
}
return ret;
}
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