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gstreamer/sys/v4l2/gstv4l2src.c
Thomas Vander Stichele 7fa1c52301 change NULL to (NULL) for GST_ELEMENT_ERROR 
Original commit message from CVS:
change NULL to (NULL) for GST_ELEMENT_ERROR
Make sure errors end with "."
2004-02-02 17:23:33 +00:00

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/* G-Streamer Video4linux2 video-capture plugin
* Copyright (C) 2002 Ronald Bultje <rbultje@ronald.bitfreak.net>
*
* 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 <string.h>
#include <sys/time.h>
#include "v4l2src_calls.h"
#include "gstv4l2tuner.h"
GST_DEBUG_CATEGORY (v4l2src_debug);
#define GST_CAT_DEFAULT v4l2src_debug
/* elementfactory details */
static GstElementDetails gst_v4l2src_details = {
"Video (video4linux2) Source",
"Source/Video",
"Reads frames (compressed or uncompressed) from a video4linux2 device",
"Ronald Bultje <rbultje@ronald.bitfreak.net>"
};
/* V4l2Src signals and args */
enum {
SIGNAL_FRAME_CAPTURE,
SIGNAL_FRAME_DROP,
SIGNAL_FRAME_INSERT,
SIGNAL_FRAME_LOST,
LAST_SIGNAL
};
/* arguments */
enum {
ARG_0,
ARG_NUMBUFS,
ARG_BUFSIZE,
ARG_USE_FIXED_FPS
};
guint32 gst_v4l2_formats[] = {
/* from Linux 2.6.0 videodev2.h */
V4L2_PIX_FMT_RGB332, /* 8 RGB-3-3-2 */
V4L2_PIX_FMT_RGB555, /* 16 RGB-5-5-5 */
V4L2_PIX_FMT_RGB565, /* 16 RGB-5-6-5 */
V4L2_PIX_FMT_RGB555X, /* 16 RGB-5-5-5 BE */
V4L2_PIX_FMT_RGB565X, /* 16 RGB-5-6-5 BE */
V4L2_PIX_FMT_BGR24, /* 24 BGR-8-8-8 */
V4L2_PIX_FMT_RGB24, /* 24 RGB-8-8-8 */
V4L2_PIX_FMT_BGR32, /* 32 BGR-8-8-8-8 */
V4L2_PIX_FMT_RGB32, /* 32 RGB-8-8-8-8 */
V4L2_PIX_FMT_GREY, /* 8 Greyscale */
V4L2_PIX_FMT_YVU410, /* 9 YVU 4:1:0 */
V4L2_PIX_FMT_YVU420, /* 12 YVU 4:2:0 */
V4L2_PIX_FMT_YUYV, /* 16 YUV 4:2:2 */
V4L2_PIX_FMT_UYVY, /* 16 YUV 4:2:2 */
V4L2_PIX_FMT_YUV422P, /* 16 YVU422 planar */
V4L2_PIX_FMT_YUV411P, /* 16 YVU411 planar */
V4L2_PIX_FMT_Y41P, /* 12 YUV 4:1:1 */
V4L2_PIX_FMT_NV12, /* 12 Y/CbCr 4:2:0 */
V4L2_PIX_FMT_NV21, /* 12 Y/CrCb 4:2:0 */
V4L2_PIX_FMT_YUV410, /* 9 YUV 4:1:0 */
V4L2_PIX_FMT_YUV420, /* 12 YUV 4:2:0 */
V4L2_PIX_FMT_YYUV, /* 16 YUV 4:2:2 */
V4L2_PIX_FMT_HI240, /* 8 8-bit color */
V4L2_PIX_FMT_MJPEG, /* Motion-JPEG */
V4L2_PIX_FMT_JPEG, /* JFIF JPEG */
V4L2_PIX_FMT_DV, /* 1394 */
V4L2_PIX_FMT_MPEG, /* MPEG */
V4L2_PIX_FMT_WNVA /* Winnov hw compres */
};
#define GST_V4L2_FORMAT_COUNT (G_N_ELEMENTS (gst_v4l2_formats))
GST_FORMATS_FUNCTION (GstPad *, gst_v4l2src_get_formats,
GST_FORMAT_TIME, GST_FORMAT_DEFAULT);
GST_QUERY_TYPE_FUNCTION (GstPad *, gst_v4l2src_get_query_types,
GST_QUERY_POSITION);
/* init functions */
static void gst_v4l2src_class_init (gpointer g_class,
gpointer class_data);
static void gst_v4l2src_base_init (gpointer g_class);
static void gst_v4l2src_init (GTypeInstance * instance,
gpointer g_class);
/* signal functions */
static void gst_v4l2src_open (GstElement *element,
const gchar *device);
static void gst_v4l2src_close (GstElement *element,
const gchar *device);
/* pad/buffer functions */
static const GstCaps * gst_v4l2src_get_all_caps (void);
static GstPadLinkReturn gst_v4l2src_link (GstPad *pad,
const GstCaps *caps);
static GstCaps * gst_v4l2src_getcaps (GstPad *pad);
static GstCaps * gst_v4l2src_fixate (GstPad * pad,
const GstCaps * caps);
static GstData * gst_v4l2src_get (GstPad *pad);
static gboolean gst_v4l2src_src_convert (GstPad *pad,
GstFormat src_format,
gint64 src_value,
GstFormat *dest_format,
gint64 *dest_value);
static gboolean gst_v4l2src_src_query (GstPad *pad,
GstQueryType type,
GstFormat *format,
gint64 *value);
/* get/set params */
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);
/* state handling */
static GstElementStateReturn
gst_v4l2src_change_state (GstElement *element);
/* set_clock function for A/V sync */
static void gst_v4l2src_set_clock (GstElement *element,
GstClock *clock);
static GstElementClass *parent_class = NULL;
static guint gst_v4l2src_signals[LAST_SIGNAL] = { 0 };
GType
gst_v4l2src_get_type (void)
{
static GType v4l2src_type = 0;
if (!v4l2src_type) {
static const GTypeInfo v4l2src_info = {
sizeof (GstV4l2SrcClass),
gst_v4l2src_base_init,
NULL,
gst_v4l2src_class_init,
NULL,
NULL,
sizeof (GstV4l2Src),
0,
gst_v4l2src_init,
NULL
};
v4l2src_type = g_type_register_static(GST_TYPE_V4L2ELEMENT,
"GstV4l2Src", &v4l2src_info, 0);
GST_DEBUG_CATEGORY_INIT (v4l2src_debug, "v4l2src", 0, "v4l2src element");
}
return v4l2src_type;
}
static void
gst_v4l2src_base_init (gpointer g_class)
{
GstPadTemplate *template;
GstElementClass *gstelement_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_set_details (gstelement_class, &gst_v4l2src_details);
template = gst_pad_template_new ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
gst_caps_copy (gst_v4l2src_get_all_caps ()));
gst_element_class_add_pad_template (gstelement_class, template);
}
static void
gst_v4l2src_class_init (gpointer g_class, gpointer class_data)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (g_class);
GstElementClass *gstelement_class = GST_ELEMENT_CLASS (g_class);
GstV4l2ElementClass *v4l2_class = GST_V4L2ELEMENT_CLASS (g_class);
parent_class = g_type_class_peek_parent (g_class);
gobject_class->set_property = gst_v4l2src_set_property;
gobject_class->get_property = gst_v4l2src_get_property;
g_object_class_install_property(gobject_class, ARG_NUMBUFS,
g_param_spec_int("num_buffers","num_buffers","num_buffers",
G_MININT,G_MAXINT,0,G_PARAM_READWRITE));
g_object_class_install_property(gobject_class, ARG_BUFSIZE,
g_param_spec_int("buffer_size","buffer_size","buffer_size",
G_MININT,G_MAXINT,0,G_PARAM_READABLE));
g_object_class_install_property(gobject_class, ARG_USE_FIXED_FPS,
g_param_spec_boolean("use_fixed_fps", "Use Fixed FPS",
"Drop/Insert frames to reach a certain FPS (TRUE) "
"or adapt FPS to suit the number of frabbed frames",
TRUE, G_PARAM_READWRITE));
/* signals */
gst_v4l2src_signals[SIGNAL_FRAME_CAPTURE] =
g_signal_new("frame_capture", G_TYPE_FROM_CLASS (g_class), G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET(GstV4l2SrcClass, frame_capture),
NULL, NULL, g_cclosure_marshal_VOID__VOID,
G_TYPE_NONE, 0);
gst_v4l2src_signals[SIGNAL_FRAME_DROP] =
g_signal_new("frame_drop", G_TYPE_FROM_CLASS (g_class), G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET(GstV4l2SrcClass, frame_drop),
NULL, NULL, g_cclosure_marshal_VOID__VOID,
G_TYPE_NONE, 0);
gst_v4l2src_signals[SIGNAL_FRAME_INSERT] =
g_signal_new("frame_insert", G_TYPE_FROM_CLASS (g_class), G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET(GstV4l2SrcClass, frame_insert),
NULL, NULL, g_cclosure_marshal_VOID__VOID,
G_TYPE_NONE, 0);
gst_v4l2src_signals[SIGNAL_FRAME_LOST] =
g_signal_new("frame_lost", G_TYPE_FROM_CLASS (g_class), G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET(GstV4l2SrcClass, frame_lost),
NULL, NULL, g_cclosure_marshal_VOID__INT,
G_TYPE_NONE, 1, G_TYPE_INT);
gstelement_class->change_state = gst_v4l2src_change_state;
v4l2_class->open = gst_v4l2src_open;
v4l2_class->close = gst_v4l2src_close;
gstelement_class->set_clock = gst_v4l2src_set_clock;
}
static void
gst_v4l2src_init (GTypeInstance *instance, gpointer g_class)
{
GstV4l2Src *v4l2src = GST_V4L2SRC (instance);
GST_FLAG_SET(GST_ELEMENT(v4l2src), GST_ELEMENT_THREAD_SUGGESTED);
v4l2src->srcpad = gst_pad_new_from_template(
gst_element_class_get_pad_template (GST_ELEMENT_GET_CLASS (v4l2src), "src"), "src");
gst_element_add_pad(GST_ELEMENT(v4l2src), v4l2src->srcpad);
gst_pad_set_get_function(v4l2src->srcpad, gst_v4l2src_get);
gst_pad_set_link_function(v4l2src->srcpad, gst_v4l2src_link);
gst_pad_set_getcaps_function (v4l2src->srcpad, gst_v4l2src_getcaps);
gst_pad_set_fixate_function (v4l2src->srcpad, gst_v4l2src_fixate);
gst_pad_set_convert_function (v4l2src->srcpad, gst_v4l2src_src_convert);
gst_pad_set_formats_function (v4l2src->srcpad, gst_v4l2src_get_formats);
gst_pad_set_query_function (v4l2src->srcpad, gst_v4l2src_src_query);
gst_pad_set_query_type_function (v4l2src->srcpad, gst_v4l2src_get_query_types);
v4l2src->breq.count = 0;
v4l2src->formats = NULL;
/* no clock */
v4l2src->clock = NULL;
/* fps */
v4l2src->use_fixed_fps = TRUE;
}
static void
gst_v4l2src_open (GstElement *element,
const gchar *device)
{
gst_v4l2src_fill_format_list (GST_V4L2SRC (element));
}
static void
gst_v4l2src_close (GstElement *element,
const gchar *device)
{
gst_v4l2src_clear_format_list (GST_V4L2SRC (element));
}
static gfloat
gst_v4l2src_get_fps (GstV4l2Src *v4l2src)
{
v4l2_std_id norm;
const GList *item;
if (!v4l2src->use_fixed_fps &&
v4l2src->clock != NULL &&
v4l2src->handled > 0) {
/* try to get time from clock master and calculate fps */
GstClockTime time = gst_clock_get_time(v4l2src->clock) -
v4l2src->substract_time;
return v4l2src->handled * GST_SECOND / time;
}
/* if that failed ... */
if (!GST_V4L2_IS_OPEN(GST_V4L2ELEMENT(v4l2src)))
return 0.;
if (!gst_v4l2_get_norm(GST_V4L2ELEMENT(v4l2src), &norm))
return 0.;
for (item = GST_V4L2ELEMENT(v4l2src)->norms;
item != NULL; item = item->next) {
GstV4l2TunerNorm *v4l2norm = item->data;
if (v4l2norm->index == norm)
return GST_TUNER_NORM(v4l2norm)->fps;
}
return 0.;
}
static gboolean
gst_v4l2src_src_convert (GstPad *pad,
GstFormat src_format,
gint64 src_value,
GstFormat *dest_format,
gint64 *dest_value)
{
GstV4l2Src *v4l2src;
gdouble fps;
v4l2src = GST_V4L2SRC (gst_pad_get_parent (pad));
if ((fps = gst_v4l2src_get_fps(v4l2src)) == 0)
return FALSE;
switch (src_format) {
case GST_FORMAT_TIME:
switch (*dest_format) {
case GST_FORMAT_DEFAULT:
*dest_value = src_value * fps / GST_SECOND;
break;
default:
return FALSE;
}
break;
case GST_FORMAT_DEFAULT:
switch (*dest_format) {
case GST_FORMAT_TIME:
*dest_value = src_value * GST_SECOND / fps;
break;
default:
return FALSE;
}
break;
default:
return FALSE;
}
return TRUE;
}
static gboolean
gst_v4l2src_src_query (GstPad *pad,
GstQueryType type,
GstFormat *format,
gint64 *value)
{
GstV4l2Src *v4l2src = GST_V4L2SRC (gst_pad_get_parent (pad));
gboolean res = TRUE;
gdouble fps;
if ((fps = gst_v4l2src_get_fps(v4l2src)) == 0)
return FALSE;
switch (type) {
case GST_QUERY_POSITION:
switch (*format) {
case GST_FORMAT_TIME:
*value = v4l2src->handled * GST_SECOND / fps;
break;
case GST_FORMAT_DEFAULT:
*value = v4l2src->handled;
break;
default:
res = FALSE;
break;
}
break;
default:
res = FALSE;
break;
}
return res;
}
static GstStructure *
gst_v4l2src_v4l2fourcc_to_caps (guint32 fourcc)
{
GstStructure *structure = NULL;
switch (fourcc) {
case V4L2_PIX_FMT_MJPEG: /* Motion-JPEG */
case V4L2_PIX_FMT_JPEG: /* JFIF JPEG */
structure = gst_structure_new ("video/x-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;
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_YUV422P: /* 16 YVU422 planar */
case V4L2_PIX_FMT_YUV411P: /* 16 YVU411 planar */
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: {
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','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;
}
#if 0
gst_caps_set_simple (caps,
"width", G_TYPE_INT, width,
"height", G_TYPE_INT, height,
"framerate", G_TYPE_DOUBLE, fps,
NULL);
#endif
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 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") ||
!strcmp(mimetype, "video/x-raw-rgb")) {
if (!strcmp(mimetype, "video/x-raw-rgb"))
fourcc = GST_MAKE_FOURCC('R','G','B',' ');
else
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('R','G','B',' '): {
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;
}
default:
break;
}
}
} else if (strcmp (mimetype, "video/x-dv") == 0) {
fourcc = V4L2_PIX_FMT_DV;
} else if (strcmp (mimetype, "video/x-jpeg") == 0) {
fourcc = V4L2_PIX_FMT_JPEG;
}
return fourcc;
}
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 const 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, 4096,
"height", GST_TYPE_INT_RANGE, 1, 4096,
"framerate", GST_TYPE_DOUBLE_RANGE, (double) 0, G_MAXDOUBLE,
NULL);
gst_caps_append_structure (caps, structure);
}
}
}
return caps;
}
static GstCaps *
gst_v4l2src_fixate (GstPad *pad, const GstCaps *const_caps)
{
gint i;
GstStructure *structure;
G_GNUC_UNUSED gchar *caps_str;
gboolean changed = FALSE;
GstCaps *caps = gst_caps_copy (const_caps);
caps_str = gst_caps_to_string (caps);
GST_DEBUG_OBJECT (gst_pad_get_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);
changed |= gst_caps_structure_fixate_field_nearest_int (structure, "width", G_MAXINT);
}
if (changed) return caps;
for (i = 0; i < gst_caps_get_size (caps); i++) {
structure = gst_caps_get_structure (caps, i);
changed |= gst_caps_structure_fixate_field_nearest_int (structure, "height", G_MAXINT);
}
if (changed) return caps;
gst_caps_free (caps);
return NULL;
}
static GstPadLinkReturn
gst_v4l2src_link (GstPad *pad, const GstCaps *caps)
{
GstV4l2Src *v4l2src;
GstV4l2Element *v4l2element;
struct v4l2_fmtdesc *format;
int w, h;
GstStructure *structure;
v4l2src = GST_V4L2SRC(gst_pad_get_parent (pad));
v4l2element = GST_V4L2ELEMENT(v4l2src);
structure = gst_caps_get_structure (caps, 0);
/* clean up if we still haven't cleaned up our previous
* capture session */
if (GST_V4L2_IS_ACTIVE(v4l2element)) {
if (!gst_v4l2src_capture_deinit(v4l2src))
return GST_PAD_LINK_REFUSED;
} else if (!GST_V4L2_IS_OPEN(v4l2element)) {
return GST_PAD_LINK_DELAYED;
}
/* we want our own v4l2 type of fourcc codes */
if (!(format = gst_v4l2_caps_to_v4l2fourcc(v4l2src, structure))) {
return GST_PAD_LINK_REFUSED;
}
gst_structure_get_int (structure, "width", &w);
gst_structure_get_int (structure, "height", &h);
/* we found the pixelformat! - try it out */
if (gst_v4l2src_set_capture(v4l2src, format, w, h)) {
if (gst_v4l2src_capture_init(v4l2src)) {
return GST_PAD_LINK_OK;
}
}
return GST_PAD_LINK_REFUSED;
}
static GstCaps *
gst_v4l2src_getcaps (GstPad *pad)
{
GstV4l2Src *v4l2src = GST_V4L2SRC(gst_pad_get_parent (pad));
GstCaps *caps;
struct v4l2_fmtdesc *format;
int min_w, max_w, min_h, max_h;
GSList *walk;
GstStructure *structure;
if (!GST_V4L2_IS_OPEN(GST_V4L2ELEMENT(v4l2src))) {
return gst_caps_new_any ();
}
/* build our own capslist */
caps = gst_caps_new_empty();
walk = v4l2src->formats;
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;
}
/* 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,
"framerate", GST_TYPE_DOUBLE_RANGE, (double) 0, G_MAXDOUBLE,
NULL);
gst_caps_append_structure (caps, structure);
}
}
return caps;
}
static GstData*
gst_v4l2src_get (GstPad *pad)
{
GstV4l2Src *v4l2src;
GstBuffer *buf;
gint i, num = -1;
gdouble fps = 0;
v4l2src = GST_V4L2SRC (gst_pad_get_parent (pad));
if (v4l2src->use_fixed_fps &&
(fps = gst_v4l2src_get_fps(v4l2src)) == 0) {
GST_ELEMENT_ERROR (v4l2src, RESOURCE, SETTINGS, (NULL), ("could not get frame rate for element"));
return NULL;
}
if (v4l2src->need_writes > 0) {
/* use last frame */
buf = v4l2src->cached_buffer;
v4l2src->need_writes--;
} else {
GstClockTime time;
/* grab a frame from the device */
num = gst_v4l2src_grab_frame(v4l2src);
if (num == -1)
return NULL;
/* to check if v4l2 sets the correct time */
time = GST_TIMEVAL_TO_TIME(v4l2src->pool->buffers[num].buffer.timestamp);
if (v4l2src->clock && v4l2src->use_fixed_fps && time != 0) {
gboolean have_frame = FALSE;
do {
/* FIXME: isn't this v4l2 timestamp its own clock?! */
/* by default, we use the frame once */
v4l2src->need_writes = 1;
g_assert (time >= v4l2src->substract_time);
time -= v4l2src->substract_time;
/* first check whether we lost any frames according to the device */
if (v4l2src->last_seq != 0) {
if (v4l2src->pool->buffers[num].buffer.sequence - v4l2src->last_seq > 1) {
v4l2src->need_writes = v4l2src->pool->buffers[num].buffer.sequence - v4l2src->last_seq;
g_signal_emit(G_OBJECT(v4l2src), gst_v4l2src_signals[SIGNAL_FRAME_LOST], 0,
v4l2src->need_writes - 1);
}
}
v4l2src->last_seq = v4l2src->pool->buffers[num].buffer.sequence;
/* decide how often we're going to write the frame - set
* v4lmjpegsrc->need_writes to (that-1) and have_frame to TRUE
* if we're going to write it - else, just continue.
*
* time is generally the system or audio clock. Let's
* say that we've written one second of audio, then we want
* to have written one second of video too, within the same
* timeframe. This means that if time - begin_time = X sec,
* we want to have written X*fps frames. If we've written
* more - drop, if we've written less - dup... */
if (v4l2src->handled * (GST_SECOND/fps) - time > 1.5 * (GST_SECOND/fps)) {
/* yo dude, we've got too many frames here! Drop! DROP! */
v4l2src->need_writes--; /* -= (v4l2src->handled - (time / fps)); */
g_signal_emit(G_OBJECT(v4l2src), gst_v4l2src_signals[SIGNAL_FRAME_DROP], 0);
} else if (v4l2src->handled * (GST_SECOND/fps) - time < -1.5 * (GST_SECOND/fps)) {
/* this means we're lagging far behind */
v4l2src->need_writes++; /* += ((time / fps) - v4l2src->handled); */
g_signal_emit(G_OBJECT(v4l2src), gst_v4l2src_signals[SIGNAL_FRAME_INSERT], 0);
}
if (v4l2src->need_writes > 0) {
have_frame = TRUE;
v4l2src->need_writes--;
} else {
if (!gst_v4l2src_queue_frame(v4l2src, num))
return NULL;
num = gst_v4l2src_grab_frame(v4l2src);
if (num == -1)
return NULL;
}
} while (!have_frame);
}
g_assert (num != -1);
GST_LOG_OBJECT (v4l2src, "buffer %d needs %d writes", num, v4l2src->need_writes + 1);
i = v4l2src->pool->buffers[num].buffer.bytesused > 0 ?
v4l2src->pool->buffers[num].buffer.bytesused :
v4l2src->pool->buffers[num].length;
/* 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 (gst_atomic_int_read (&v4l2src->pool->refcount) == v4l2src->breq.count) {
GST_LOG_OBJECT (v4l2src, "using memcpy'd buffer");
buf = gst_buffer_new_and_alloc (i);
memcpy (GST_BUFFER_DATA (buf), v4l2src->pool->buffers[num].start, i);
if (!gst_v4l2src_queue_frame(v4l2src, num)) {
gst_data_unref (GST_DATA (buf));
return NULL;
}
} else {
GST_LOG_OBJECT (v4l2src, "using mmap'd buffer");
buf = gst_buffer_new ();
GST_BUFFER_DATA (buf) = v4l2src->pool->buffers[num].start;
GST_BUFFER_SIZE (buf) = i;
GST_BUFFER_FREE_DATA_FUNC (buf) = gst_v4l2src_free_buffer;
GST_BUFFER_PRIVATE (buf) = &v4l2src->pool->buffers[num];
/* no need to be careful here, both are > 0, because the element uses them */
gst_atomic_int_inc (&v4l2src->pool->buffers[num].refcount);
gst_atomic_int_inc (&v4l2src->pool->refcount);
}
GST_BUFFER_MAXSIZE (buf) = v4l2src->pool->buffers[num].length;
if (v4l2src->use_fixed_fps) {
GST_BUFFER_TIMESTAMP (buf) = v4l2src->handled * GST_SECOND / fps;
GST_BUFFER_DURATION (buf) = GST_SECOND / fps;
} else {
/* calculate time based on our own clock */
GST_BUFFER_TIMESTAMP(buf) = GST_TIMEVAL_TO_TIME(v4l2src->pool->buffers[num].buffer.timestamp) -
v4l2src->substract_time;
}
if (v4l2src->need_writes > 0) {
v4l2src->cached_buffer = buf;
for (i = 0; i < v4l2src->need_writes; i++) {
gst_data_ref (GST_DATA (buf));
}
}
}
v4l2src->handled++;
g_signal_emit(G_OBJECT(v4l2src), gst_v4l2src_signals[SIGNAL_FRAME_CAPTURE], 0);
return GST_DATA (buf);
}
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);
switch (prop_id) {
case ARG_NUMBUFS:
if (!GST_V4L2_IS_ACTIVE(GST_V4L2ELEMENT(v4l2src))) {
v4l2src->breq.count = g_value_get_int(value);
}
break;
case ARG_USE_FIXED_FPS:
if (!GST_V4L2_IS_ACTIVE(GST_V4L2ELEMENT(v4l2src))) {
v4l2src->use_fixed_fps = g_value_get_boolean(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);
switch (prop_id) {
case ARG_NUMBUFS:
g_value_set_int(value, v4l2src->breq.count);
break;
case ARG_BUFSIZE:
g_value_set_int(value, v4l2src->format.fmt.pix.sizeimage);
break;
case ARG_USE_FIXED_FPS:
g_value_set_boolean(value, v4l2src->use_fixed_fps);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static GstElementStateReturn
gst_v4l2src_change_state (GstElement *element)
{
GstV4l2Src *v4l2src;
gint transition = GST_STATE_TRANSITION (element);
GstElementStateReturn parent_return;
GTimeVal time;
g_return_val_if_fail(GST_IS_V4L2SRC(element), GST_STATE_FAILURE);
v4l2src = GST_V4L2SRC(element);
if (GST_ELEMENT_CLASS (parent_class)->change_state) {
parent_return = GST_ELEMENT_CLASS (parent_class)->change_state (element);
if (parent_return != GST_STATE_SUCCESS)
return parent_return;
}
switch (transition) {
case GST_STATE_NULL_TO_READY:
if (!gst_v4l2src_get_capture(v4l2src))
return GST_STATE_FAILURE;
break;
case GST_STATE_READY_TO_PAUSED:
v4l2src->handled = 0;
v4l2src->need_writes = 0;
v4l2src->substract_time = 0;
/* buffer setup moved to capsnego */
break;
case GST_STATE_PAUSED_TO_PLAYING:
/* queue all buffer, start streaming capture */
if (!gst_v4l2src_capture_start(v4l2src))
return GST_STATE_FAILURE;
g_get_current_time(&time);
v4l2src->substract_time = GST_TIMEVAL_TO_TIME(time) -
v4l2src->substract_time;
v4l2src->last_seq = 0;
break;
case GST_STATE_PLAYING_TO_PAUSED:
g_get_current_time(&time);
v4l2src->substract_time = GST_TIMEVAL_TO_TIME(time) -
v4l2src->substract_time;
/* de-queue all queued buffers */
if (!gst_v4l2src_capture_stop(v4l2src))
return GST_STATE_FAILURE;
break;
case GST_STATE_PAUSED_TO_READY:
/* stop capturing, unmap all buffers */
if (!gst_v4l2src_capture_deinit(v4l2src))
return GST_STATE_FAILURE;
break;
case GST_STATE_READY_TO_NULL:
break;
}
return GST_STATE_SUCCESS;
}
static void
gst_v4l2src_set_clock (GstElement *element,
GstClock *clock)
{
GST_V4L2SRC(element)->clock = clock;
}
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