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gstreamer/sys/v4l2/gstv4l2src.c
Tim-Philipp Müller 7c69e90236 sys/v4l2/: Implement LATENCY queries in the crudest way possible so I don't have to use sync=false any longer when te... 
Original commit message from CVS:
* sys/v4l2/gstv4l2src.c:
* sys/v4l2/gstv4l2src.h:
* sys/v4l2/v4l2src_calls.c:
Implement LATENCY queries in the crudest way possible so I don't
have to use sync=false any longer when testing with videosinks.
2007-09-05 14:43:16 +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 lines</title>
* <para>
* <programlisting>
* gst-launch v4l2src ! xvimagesink
* </programlisting>
* This pipeline shows the video captured from /dev/video0 tv card and for
* webcams.
* </para>
* <para>
* <programlisting>
* gst-launch-0.10 v4l2src ! jpegdec ! xvimagesink
* </programlisting>
* This pipeline shows the video captured from a webcam that delivers jpeg
* images.
* </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);
static void gst_v4l2src_finalize (GstV4l2Src * v4l2src);
/* 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 gboolean gst_v4l2src_query (GstBaseSrc * bsrc, GstQuery * query);
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->finalize = (GObjectFinalizeFunc) gst_v4l2src_finalize;
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_DEBUG_FUNCPTR (gst_v4l2src_get_caps);
basesrc_class->set_caps = GST_DEBUG_FUNCPTR (gst_v4l2src_set_caps);
basesrc_class->start = GST_DEBUG_FUNCPTR (gst_v4l2src_start);
basesrc_class->stop = GST_DEBUG_FUNCPTR (gst_v4l2src_stop);
basesrc_class->query = GST_DEBUG_FUNCPTR (gst_v4l2src_query);
pushsrc_class->create = GST_DEBUG_FUNCPTR (gst_v4l2src_create);
}
static void
gst_v4l2src_init (GstV4l2Src * v4l2src, GstV4l2SrcClass * klass)
{
/* fixme: give an update_fps_function */
v4l2src->v4l2object = gst_v4l2_object_new (GST_ELEMENT (v4l2src),
gst_v4l2_get_input, gst_v4l2_set_input, NULL);
/* number of buffers requested */
v4l2src->num_buffers = GST_V4L2_MIN_BUFFERS;
v4l2src->formats = NULL;
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);
v4l2src->fps_d = 0;
v4l2src->fps_n = 0;
}
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_finalize (GstV4l2Src * v4l2src)
{
gst_v4l2_object_destroy (v4l2src->v4l2object);
G_OBJECT_CLASS (parent_class)->finalize ((GObject *) (v4l2src));
}
static void
gst_v4l2src_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec)
{
GstV4l2Src *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->num_buffers = 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 = 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->num_buffers);
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_structure (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;
case V4L2_PIX_FMT_SBGGR8:
structure = gst_structure_new ("video/x-raw-bayer", NULL);
break;
default:
GST_DEBUG ("Unknown fourcc 0x%08x %" GST_FOURCC_FORMAT,
fourcc, GST_FOURCC_ARGS (fourcc));
break;
}
return structure;
}
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 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_structure (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 *ret;
GSList *walk;
if (!GST_V4L2_IS_OPEN (v4l2src->v4l2object)) {
/* FIXME: copy? */
return
gst_caps_copy (gst_pad_get_pad_template_caps (GST_BASE_SRC_PAD
(v4l2src)));
}
if (v4l2src->probed_caps)
return gst_caps_ref (v4l2src->probed_caps);
if (!v4l2src->formats)
gst_v4l2src_fill_format_list (v4l2src);
ret = gst_caps_new_empty ();
for (walk = v4l2src->formats; walk; walk = walk->next) {
struct v4l2_fmtdesc *format;
GstStructure *template;
format = (struct v4l2_fmtdesc *) walk->data;
template = gst_v4l2src_v4l2fourcc_to_structure (format->pixelformat);
if (template) {
GstCaps *tmp;
tmp = gst_v4l2src_probe_caps_for_format (v4l2src, format->pixelformat,
template);
if (tmp)
gst_caps_append (ret, tmp);
gst_structure_free (template);
} else {
GST_DEBUG_OBJECT (v4l2src, "unknown format %u", format->pixelformat);
}
}
v4l2src->probed_caps = gst_caps_ref (ret);
return ret;
}
/* 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_get_caps_info (GstV4l2Src * v4l2src, GstCaps * caps,
struct v4l2_fmtdesc **format, gint * w, gint * h, guint * fps_n,
guint * fps_d, guint * size)
{
GstStructure *structure;
const GValue *framerate;
guint32 fourcc;
const gchar *mimetype;
guint outsize;
/* default unknown values */
fourcc = 0;
outsize = 0;
structure = gst_caps_get_structure (caps, 0);
if (!gst_structure_get_int (structure, "width", w))
return FALSE;
if (!gst_structure_get_int (structure, "height", h))
return FALSE;
framerate = gst_structure_get_value (structure, "framerate");
if (!framerate)
return FALSE;
*fps_n = gst_value_get_fraction_numerator (framerate);
*fps_d = gst_value_get_fraction_denominator (framerate);
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;
outsize = GST_ROUND_UP_4 (*w) * GST_ROUND_UP_2 (*h);
outsize += 2 * ((GST_ROUND_UP_8 (*w) / 2) * (GST_ROUND_UP_2 (*h) / 2));
break;
case GST_MAKE_FOURCC ('Y', 'U', 'Y', '2'):
fourcc = V4L2_PIX_FMT_YUYV;
outsize = (GST_ROUND_UP_2 (*w) * 2) * *h;
break;
case GST_MAKE_FOURCC ('Y', '4', '1', 'P'):
fourcc = V4L2_PIX_FMT_Y41P;
outsize = (GST_ROUND_UP_2 (*w) * 2) * *h;
break;
case GST_MAKE_FOURCC ('U', 'Y', 'V', 'Y'):
fourcc = V4L2_PIX_FMT_UYVY;
outsize = (GST_ROUND_UP_2 (*w) * 2) * *h;
break;
case GST_MAKE_FOURCC ('Y', 'V', '1', '2'):
fourcc = V4L2_PIX_FMT_YVU420;
outsize = GST_ROUND_UP_4 (*w) * GST_ROUND_UP_2 (*h);
outsize += 2 * ((GST_ROUND_UP_8 (*w) / 2) * (GST_ROUND_UP_2 (*h) / 2));
break;
case GST_MAKE_FOURCC ('Y', '4', '1', 'B'):
fourcc = V4L2_PIX_FMT_YUV411P;
outsize = GST_ROUND_UP_4 (*w) * *h;
outsize += 2 * ((GST_ROUND_UP_8 (*w) / 4) * *h);
break;
case GST_MAKE_FOURCC ('Y', '4', '2', 'B'):
fourcc = V4L2_PIX_FMT_YUV422P;
outsize = GST_ROUND_UP_4 (*w) * *h;
outsize += 2 * ((GST_ROUND_UP_8 (*w) / 2) * *h);
break;
}
} 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;
}
if (fourcc == 0)
return FALSE;
*format = gst_v4l2src_get_format_from_fourcc (v4l2src, fourcc);
*size = outsize;
return TRUE;
}
static gboolean
gst_v4l2src_set_caps (GstBaseSrc * src, GstCaps * caps)
{
GstV4l2Src *v4l2src;
gint w = 0, h = 0;
struct v4l2_fmtdesc *format;
guint fps_n, fps_d;
guint size;
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;
}
/* we want our own v4l2 type of fourcc codes */
if (!gst_v4l2_get_caps_info (v4l2src, caps, &format, &w, &h, &fps_n, &fps_d,
&size)) {
GST_DEBUG_OBJECT (v4l2src,
"can't get capture format from caps %" GST_PTR_FORMAT, caps);
return FALSE;
}
GST_DEBUG_OBJECT (v4l2src, "trying to set_capture %dx%d at %d/%d fps, "
"format %s", w, h, fps_n, fps_d, format->description);
if (!gst_v4l2src_set_capture (v4l2src, format->pixelformat, w, h, fps_n,
fps_d))
/* error already posted */
return FALSE;
if (!gst_v4l2src_capture_init (v4l2src, caps))
return FALSE;
if (!gst_v4l2src_capture_start (v4l2src))
return FALSE;
/* now store the expected output size */
v4l2src->frame_byte_size = size;
return TRUE;
}
static gboolean
gst_v4l2src_query (GstBaseSrc * bsrc, GstQuery * query)
{
GstV4l2Src *src;
gboolean res = FALSE;
src = GST_V4L2SRC (bsrc);
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_LATENCY:{
GstClockTime min_latency, max_latency;
/* device must be open */
if (!GST_V4L2_IS_OPEN (src->v4l2object))
goto done;
/* we must have a framerate */
if (src->fps_n <= 0 || src->fps_d <= 0)
goto done;
/* min latency is the time to capture one frame */
min_latency =
gst_util_uint64_scale_int (GST_SECOND, src->fps_d, src->fps_n);
/* max latency is total duration of the frame buffer */
/* FIXME: what to use here? */
max_latency = 1 * min_latency;
GST_DEBUG_OBJECT (bsrc,
"report latency min %" GST_TIME_FORMAT " max %" GST_TIME_FORMAT,
GST_TIME_ARGS (min_latency), GST_TIME_ARGS (max_latency));
/* we are always live, the min latency is 1 frame and the max latency is
* the complete buffer of frames. */
gst_query_set_latency (query, TRUE, min_latency, max_latency);
res = TRUE;
break;
}
default:
res = GST_BASE_SRC_CLASS (parent_class)->query (bsrc, query);
break;
}
done:
return res;
}
/* 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);
/* open the device */
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;
}
/* close the device */
if (!gst_v4l2_object_stop (v4l2src->v4l2object))
return FALSE;
v4l2src->fps_d = 0;
v4l2src->fps_n = 0;
return TRUE;
}
static GstFlowReturn
gst_v4l2src_get_read (GstV4l2Src * v4l2src, GstBuffer ** buf)
{
gint amount;
gint buffersize;
buffersize = v4l2src->frame_byte_size;
*buf = gst_buffer_new_and_alloc (buffersize);
do {
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 {
/* short reads can happen if a signal interrupts the read */
continue;
}
} while (TRUE);
GST_BUFFER_OFFSET (*buf) = v4l2src->offset++;
GST_BUFFER_OFFSET_END (*buf) = v4l2src->offset;
/* timestamps, LOCK to get clock and base time. */
{
GstClock *clock;
GstClockTime timestamp;
GST_OBJECT_LOCK (v4l2src);
if ((clock = GST_ELEMENT_CLOCK (v4l2src))) {
/* we have a clock, get base time and ref clock */
timestamp = GST_ELEMENT (v4l2src)->base_time;
gst_object_ref (clock);
} else {
/* no clock, can't set timestamps */
timestamp = GST_CLOCK_TIME_NONE;
}
GST_OBJECT_UNLOCK (v4l2src);
if (clock) {
GstClockTime latency;
/* the time now is the time of the clock minus the base time */
timestamp = gst_clock_get_time (clock) - timestamp;
gst_object_unref (clock);
latency =
gst_util_uint64_scale_int (GST_SECOND, v4l2src->fps_d,
v4l2src->fps_n);
if (timestamp > latency)
timestamp -= latency;
else
timestamp = 0;
}
/* FIXME: use the timestamp from the buffer itself! */
GST_BUFFER_TIMESTAMP (*buf) = timestamp;
}
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;
}
}
static GstFlowReturn
gst_v4l2src_get_mmap (GstV4l2Src * v4l2src, GstBuffer ** buf)
{
GstBuffer *temp;
GstFlowReturn ret;
guint size;
guint count;
count = 0;
again:
ret = gst_v4l2src_grab_frame (v4l2src, &temp);
if (ret != GST_FLOW_OK)
goto done;
if (v4l2src->frame_byte_size > 0) {
size = GST_BUFFER_SIZE (temp);
/* if size does not match what we expected, try again */
if (size != v4l2src->frame_byte_size) {
GST_ELEMENT_WARNING (v4l2src, RESOURCE, READ,
(_("Got unexpected frame size of %u instead of %u."),
size, v4l2src->frame_byte_size), (NULL));
gst_buffer_unref (temp);
if (count++ > 50)
goto size_error;
goto again;
}
}
*buf = temp;
done:
return ret;
/* ERRORS */
size_error:
{
GST_ELEMENT_ERROR (v4l2src, RESOURCE, READ,
(_("Error read()ing %d bytes on device '%s'."),
v4l2src->frame_byte_size, v4l2src->v4l2object->videodev), (NULL));
return GST_FLOW_ERROR;
}
}
static GstFlowReturn
gst_v4l2src_create (GstPushSrc * src, GstBuffer ** buf)
{
GstV4l2Src *v4l2src = GST_V4L2SRC (src);
GstFlowReturn ret;
if (v4l2src->use_mmap) {
ret = gst_v4l2src_get_mmap (v4l2src, buf);
} else {
ret = gst_v4l2src_get_read (v4l2src, buf);
}
return ret;
}
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