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gstreamer/sys/v4l2/gstv4l2src.c
Wim Taymans fd11a17a24 - UNITS -> DEFAULT 
Original commit message from CVS:
- UNITS -> DEFAULT
2003-05-24 10:47:37 +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.
*/
#include <string.h>
#include <sys/time.h>
#include "v4l2src_calls.h"
/* elementfactory details */
static GstElementDetails gst_v4l2src_details = {
"Video (video4linux2) Source",
"Source/Video",
"LGPL",
"Reads frames (compressed or uncompressed) from a video4linux2 device",
VERSION,
"Ronald Bultje <rbultje@ronald.bitfreak.net>",
"(C) 2002",
};
/* 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
};
/* init functions */
static void gst_v4l2src_class_init (GstV4l2SrcClass *klass);
static void gst_v4l2src_init (GstV4l2Src *v4l2src);
/* 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 gboolean gst_v4l2src_srcconvert (GstPad *pad,
GstFormat src_format,
gint64 src_value,
GstFormat *dest_format,
gint64 *dest_value);
static GstPadLinkReturn gst_v4l2src_srcconnect (GstPad *pad,
GstCaps *caps);
static GstCaps * gst_v4l2src_getcaps (GstPad *pad,
GstCaps *caps);
static GstBuffer * gst_v4l2src_get (GstPad *pad);
/* 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);
/* bufferpool functions */
static GstBuffer * gst_v4l2src_buffer_new (GstBufferPool *pool,
guint64 offset,
guint size,
gpointer user_data);
static void gst_v4l2src_buffer_free (GstBufferPool *pool,
GstBuffer *buf,
gpointer user_data);
static GstPadTemplate *src_template;
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),
NULL,
NULL,
(GClassInitFunc) gst_v4l2src_class_init,
NULL,
NULL,
sizeof(GstV4l2Src),
0,
(GInstanceInitFunc) gst_v4l2src_init,
NULL
};
v4l2src_type = g_type_register_static(GST_TYPE_V4L2ELEMENT,
"GstV4l2Src", &v4l2src_info, 0);
}
return v4l2src_type;
}
static void
gst_v4l2src_class_init (GstV4l2SrcClass *klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
GstV4l2ElementClass *v4l2_class;
gobject_class = (GObjectClass*)klass;
gstelement_class = (GstElementClass*)klass;
v4l2_class = (GstV4l2ElementClass*)klass;
parent_class = g_type_class_ref(GST_TYPE_V4L2ELEMENT);
g_object_class_install_property(G_OBJECT_CLASS(klass), 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(G_OBJECT_CLASS(klass), 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(G_OBJECT_CLASS(klass), 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(klass), 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(klass), 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(klass), 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(klass), G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET(GstV4l2SrcClass, frame_lost),
NULL, NULL, g_cclosure_marshal_VOID__INT,
G_TYPE_NONE, 1, G_TYPE_INT);
gobject_class->set_property = gst_v4l2src_set_property;
gobject_class->get_property = gst_v4l2src_get_property;
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 (GstV4l2Src *v4l2src)
{
GST_FLAG_SET(GST_ELEMENT(v4l2src), GST_ELEMENT_THREAD_SUGGESTED);
v4l2src->srcpad = gst_pad_new_from_template(src_template, "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_srcconnect);
gst_pad_set_convert_function (v4l2src->srcpad, gst_v4l2src_srcconvert);
gst_pad_set_getcaps_function (v4l2src->srcpad, gst_v4l2src_getcaps);
v4l2src->bufferpool = gst_buffer_pool_new(NULL, NULL,
gst_v4l2src_buffer_new,
NULL,
gst_v4l2src_buffer_free,
v4l2src);
v4l2src->breq.count = 0;
v4l2src->formats = NULL;
v4l2src->format_list = 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_empty_format_list(GST_V4L2SRC(element));
}
static gdouble
gst_v4l2src_get_fps (GstV4l2Src *v4l2src)
{
gint norm;
struct v4l2_standard *std;
gdouble fps;
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.;
std = ((struct v4l2_standard *) g_list_nth_data(GST_V4L2ELEMENT(v4l2src)->norms, norm));
fps = (1. * std->frameperiod.denominator) / std->frameperiod.numerator;
return fps;
}
static gboolean
gst_v4l2src_srcconvert (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 GstCaps *
gst_v4l2src_v4l2fourcc_to_caps (guint32 fourcc,
GstPropsEntry *width,
GstPropsEntry *height,
gboolean compressed)
{
GstCaps *caps = NULL;
switch (fourcc) {
case V4L2_PIX_FMT_MJPEG: /* Motion-JPEG */
case V4L2_PIX_FMT_JPEG: /* JFIF JPEG */
caps = GST_CAPS_NEW("v4l2src_caps",
"video/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;
guint32 fcc = GST_MAKE_FOURCC('R','G','B',' ');
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_RGB332) ?
G_LITTLE_ENDIAN : G_BIG_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_RGB565) ?
G_LITTLE_ENDIAN : G_BIG_ENDIAN;
r_mask = 0xf800; g_mask = 0x07e0; b_mask = 0x001f;
break;
case V4L2_PIX_FMT_RGB24:
case V4L2_PIX_FMT_BGR24:
bpp = depth = 24;
endianness = (fourcc == V4L2_PIX_FMT_BGR24) ?
G_LITTLE_ENDIAN : G_BIG_ENDIAN;
r_mask = 0xff0000; g_mask = 0x00ff00; b_mask = 0x0000ff;
break;
case V4L2_PIX_FMT_RGB32:
case V4L2_PIX_FMT_BGR32:
bpp = depth = 32;
endianness = (fourcc == V4L2_PIX_FMT_BGR32) ?
G_LITTLE_ENDIAN : G_BIG_ENDIAN;
r_mask = 0x00ff0000; g_mask = 0x0000ff00; b_mask = 0x000000ff;
break;
default:
g_assert_not_reached();
break;
}
caps = GST_CAPS_NEW("v4l2src_caps",
"video/raw",
"format", GST_PROPS_FOURCC(fcc),
"bpp", GST_PROPS_INT(bpp),
"depth", GST_PROPS_INT(depth),
"red_mask", GST_PROPS_INT(r_mask),
"green_mask", GST_PROPS_INT(g_mask),
"blue_mask", GST_PROPS_INT(b_mask),
"endianness", GST_PROPS_INT(endianness),
NULL);
break;
}
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_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;
default:
g_assert_not_reached();
break;
}
caps = GST_CAPS_NEW("v4l2src_caps",
"video/raw",
"format", GST_PROPS_FOURCC(fcc),
NULL);
break;
}
default:
GST_DEBUG(GST_CAT_PLUGIN_INFO,
"Unknown fourcc 0x%08x " GST_FOURCC_FORMAT ", trying default",
fourcc, GST_FOURCC_ARGS(fourcc));
/* add the standard one */
if (compressed) {
guint32 print_format = GUINT32_FROM_LE(fourcc);
gchar *print_format_str = (gchar *) &print_format, *string_format;
gint i;
for (i=0;i<4;i++) {
print_format_str[i] =
g_ascii_tolower(print_format_str[i]);
}
string_format = g_strdup_printf("video/%4.4s",
print_format_str);
caps = GST_CAPS_NEW("v4l2src_caps",
string_format,
NULL);
g_free(string_format);
} else {
caps = GST_CAPS_NEW("v4l2src_caps",
"video/raw",
"format",GST_PROPS_FOURCC(fourcc),
NULL);
}
break;
}
if (!caps->properties)
caps->properties = gst_props_empty_new();
gst_props_add_entry(caps->properties, width);
gst_props_add_entry(caps->properties, height);
return caps;
}
#define gst_v4l2src_v4l2fourcc_to_caps_fixed(f, width, height,c) \
gst_v4l2src_v4l2fourcc_to_caps(f, \
gst_props_entry_new("width", \
GST_PROPS_INT(width)), \
gst_props_entry_new("height", \
GST_PROPS_INT(height)), \
c)
#define gst_v4l2src_v4l2fourcc_to_caps_range(f, min_w, max_w, min_h, max_h, c) \
gst_v4l2src_v4l2fourcc_to_caps(f, \
gst_props_entry_new("width", \
GST_PROPS_INT_RANGE(min_w, max_w)), \
gst_props_entry_new("height", \
GST_PROPS_INT_RANGE(min_h, max_h)), \
c)
static struct v4l2_fmtdesc *
gst_v4l2_caps_to_v4l2fourcc (GstV4l2Src *v4l2src,
GstCaps *caps)
{
gint i;
guint32 fourcc = 0;
struct v4l2_fmtdesc *end_fmt = NULL;
const gchar *format = gst_caps_get_mime(caps);
if (!strcmp(format, "video/raw")) {
/* non-compressed */
gst_caps_get_fourcc_int(caps, "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;
gst_caps_get_int(caps, "depth", &depth);
gst_caps_get_int(caps, "endianness", &endianness);
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 = (endianness == G_LITTLE_ENDIAN) ?
V4L2_PIX_FMT_BGR24 :
V4L2_PIX_FMT_RGB24;
break;
case 32:
fourcc = (endianness == G_LITTLE_ENDIAN) ?
V4L2_PIX_FMT_BGR32 :
V4L2_PIX_FMT_RGB32;
break;
}
}
default:
break;
}
for (i=0;i<g_list_length(v4l2src->formats);i++) {
struct v4l2_fmtdesc *fmt;
fmt = (struct v4l2_fmtdesc *)
g_list_nth_data(v4l2src->formats, i);
if (fmt->pixelformat == fourcc) {
end_fmt = fmt;
break;
}
}
} else {
/* compressed */
if (strncmp(format, "video/", 6))
return NULL;
format = &format[6];
if (strlen(format) != 4)
return NULL;
fourcc = GST_MAKE_FOURCC(g_ascii_toupper(format[0]),
g_ascii_toupper(format[1]),
g_ascii_toupper(format[2]),
g_ascii_toupper(format[3]));
switch (fourcc) {
case GST_MAKE_FOURCC('J','P','E','G'): {
struct v4l2_fmtdesc *fmt;
for (i=0;i<g_list_length(v4l2src->formats);i++) {
fmt = g_list_nth_data(v4l2src->formats, i);
if (fmt->pixelformat == V4L2_PIX_FMT_MJPEG ||
fmt->pixelformat == V4L2_PIX_FMT_JPEG) {
end_fmt = fmt;
break;
}
}
break;
}
default: {
/* FIXME: check for fourcc in list */
struct v4l2_fmtdesc *fmt;
for (i=0;i<g_list_length(v4l2src->formats);i++) {
fmt = g_list_nth_data(v4l2src->formats, i);
if (fourcc == fmt->pixelformat) {
end_fmt = fmt;
break;
}
}
break;
}
}
}
return end_fmt;
}
#define gst_caps_get_int_range(caps, name, min, max) \
gst_props_entry_get_int_range(gst_props_get_entry((caps)->properties, \
name), \
min, max)
static GstPadLinkReturn
gst_v4l2src_srcconnect (GstPad *pad,
GstCaps *vscapslist)
{
GstV4l2Src *v4l2src;
GstV4l2Element *v4l2element;
GstCaps *caps;
struct v4l2_fmtdesc *format;
int w, h;
v4l2src = GST_V4L2SRC(gst_pad_get_parent (pad));
v4l2element = GST_V4L2ELEMENT(v4l2src);
/* 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;
}
for (caps = vscapslist; caps != NULL; caps = caps->next) {
/* we want our own v4l2 type of fourcc codes */
if (!(format = gst_v4l2_caps_to_v4l2fourcc(v4l2src, caps))) {
continue;
}
if (gst_caps_has_property(caps, "width")) {
if (gst_caps_has_fixed_property(caps, "width")) {
gst_caps_get_int(caps, "width", &w);
} else {
int max;
gst_caps_get_int_range(caps, "width", &max, &w);
}
}
if (gst_caps_has_property(caps, "height")) {
if (gst_caps_has_fixed_property(caps, "height")) {
gst_caps_get_int(caps, "height", &h);
} else {
int max;
gst_caps_get_int_range(caps, "height", &max, &h);
}
}
/* we found the pixelformat! - try it out */
if (gst_v4l2src_set_capture(v4l2src, format, w, h)) {
/* it fits! Now, get the proper counterpart and retry
* it on the other side (again...) - if it works, we're
* done -> GST_PAD_LINK_OK */
GstCaps *lastcaps;
GstPadLinkReturn ret_val;
lastcaps = gst_v4l2src_v4l2fourcc_to_caps_fixed(format->pixelformat,
v4l2src->format.fmt.pix.width,
v4l2src->format.fmt.pix.height,
format->flags & V4L2_FMT_FLAG_COMPRESSED);
ret_val = gst_pad_try_set_caps(v4l2src->srcpad,
lastcaps);
if (ret_val > 0) {
if (gst_v4l2src_capture_init(v4l2src)) {
return GST_PAD_LINK_DONE;
}
} else if (ret_val == GST_PAD_LINK_DELAYED) {
return GST_PAD_LINK_DELAYED;
}
}
}
return GST_PAD_LINK_REFUSED;
}
static GstCaps *
gst_v4l2src_getcaps (GstPad *pad,
GstCaps *caps)
{
GstV4l2Src *v4l2src = GST_V4L2SRC(gst_pad_get_parent (pad));
GstCaps *list = NULL;
gint i;
struct v4l2_fmtdesc *format;
int min_w, max_w, min_h, max_h;
if (!GST_V4L2_IS_OPEN(GST_V4L2ELEMENT(v4l2src))) {
return NULL;
}
/* build our own capslist */
for (i=0;i<g_list_length(v4l2src->formats);i++) {
format = g_list_nth_data(v4l2src->formats, i);
/* get size delimiters */
if (!gst_v4l2src_get_size_limits(v4l2src, format,
&min_w, &max_w,
&min_h, &max_h)) {
continue;
}
/* add to list */
caps = gst_v4l2src_v4l2fourcc_to_caps_range(format->pixelformat,
min_w, max_w,
min_h, max_h,
format->flags & V4L2_FMT_FLAG_COMPRESSED);
list = gst_caps_append(list, caps);
}
return list;
}
static GstBuffer*
gst_v4l2src_get (GstPad *pad)
{
GstV4l2Src *v4l2src;
GstBuffer *buf;
gint num;
gdouble fps = 0;
g_return_val_if_fail (pad != NULL, NULL);
v4l2src = GST_V4L2SRC(gst_pad_get_parent (pad));
if (v4l2src->use_fixed_fps &&
(fps = gst_v4l2src_get_fps(v4l2src)) == 0)
return NULL;
buf = gst_buffer_new_from_pool(v4l2src->bufferpool, 0, 0);
if (!buf) {
gst_element_error(GST_ELEMENT(v4l2src),
"Failed to create a new GstBuffer");
return NULL;
}
if (v4l2src->need_writes > 0) {
/* use last frame */
num = v4l2src->last_frame;
v4l2src->need_writes--;
} else if (v4l2src->clock && v4l2src->use_fixed_fps) {
GstClockTime time;
gboolean have_frame = FALSE;
do {
/* by default, we use the frame once */
v4l2src->need_writes = 1;
/* grab a frame from the device */
if (!gst_v4l2src_grab_frame(v4l2src, &num))
return NULL;
v4l2src->last_frame = num;
time = GST_TIMEVAL_TO_TIME(v4l2src->bufsettings.timestamp) -
v4l2src->substract_time;
/* first check whether we lost any frames according to the device */
if (v4l2src->last_seq != 0) {
if (v4l2src->bufsettings.sequence - v4l2src->last_seq > 1) {
v4l2src->need_writes = v4l2src->bufsettings.sequence -
v4l2src->last_seq;
g_signal_emit(G_OBJECT(v4l2src),
gst_v4l2src_signals[SIGNAL_FRAME_LOST],
0,
v4l2src->bufsettings.sequence -
v4l2src->last_seq - 1);
}
}
v4l2src->last_seq = v4l2src->bufsettings.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->use_num_times[num] = v4l2src->need_writes;
v4l2src->need_writes--;
} else {
gst_v4l2src_requeue_frame(v4l2src, num);
}
} while (!have_frame);
} else {
/* grab a frame from the device */
if (!gst_v4l2src_grab_frame(v4l2src, &num))
return NULL;
v4l2src->use_num_times[num] = 1;
}
GST_BUFFER_DATA(buf) = gst_v4l2src_get_buffer(v4l2src, num);
GST_BUFFER_SIZE(buf) = v4l2src->bufsettings.bytesused;
if (v4l2src->use_fixed_fps)
GST_BUFFER_TIMESTAMP(buf) = v4l2src->handled * GST_SECOND / fps;
else /* calculate time based on our own clock */
GST_BUFFER_TIMESTAMP(buf) = GST_TIMEVAL_TO_TIME(v4l2src->bufsettings.timestamp) -
v4l2src->substract_time;
v4l2src->handled++;
g_signal_emit(G_OBJECT(v4l2src),
gst_v4l2src_signals[SIGNAL_FRAME_CAPTURE], 0);
return 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->last_frame = 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;
}
static GstBuffer*
gst_v4l2src_buffer_new (GstBufferPool *pool,
guint64 offset,
guint size,
gpointer user_data)
{
GstBuffer *buffer;
GstV4l2Src *v4l2src = GST_V4L2SRC(user_data);
if (!GST_V4L2_IS_ACTIVE(GST_V4L2ELEMENT(v4l2src)))
return NULL;
buffer = gst_buffer_new();
if (!buffer)
return NULL;
/* TODO: add interlacing info to buffer as metadata
* (height>288 or 240 = topfieldfirst, else noninterlaced) */
GST_BUFFER_MAXSIZE(buffer) = v4l2src->bufsettings.length;
GST_BUFFER_FLAG_SET(buffer, GST_BUFFER_DONTFREE);
return buffer;
}
static void
gst_v4l2src_buffer_free (GstBufferPool *pool,
GstBuffer *buf,
gpointer user_data)
{
GstV4l2Src *v4l2src = GST_V4L2SRC(user_data);
int n;
if (gst_element_get_state(GST_ELEMENT(v4l2src)) != GST_STATE_PLAYING)
return; /* we've already cleaned up ourselves */
for (n=0;n<v4l2src->breq.count;n++)
if (GST_BUFFER_DATA(buf) == gst_v4l2src_get_buffer(v4l2src, n)) {
v4l2src->use_num_times[n]--;
if (v4l2src->use_num_times[n] <= 0) {
gst_v4l2src_requeue_frame(v4l2src, n);
}
break;
}
if (n == v4l2src->breq.count)
gst_element_error(GST_ELEMENT(v4l2src),
"Couldn\'t find the buffer");
/* free the buffer itself */
gst_buffer_default_free(buf);
}
static gboolean
plugin_init (GModule *module,
GstPlugin *plugin)
{
GstElementFactory *factory;
/* create an elementfactory for the v4l2src */
factory = gst_element_factory_new("v4l2src", GST_TYPE_V4L2SRC,
&gst_v4l2src_details);
g_return_val_if_fail(factory != NULL, FALSE);
src_template = gst_pad_template_new("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
NULL);
gst_element_factory_add_pad_template(factory, src_template);
gst_plugin_add_feature (plugin, GST_PLUGIN_FEATURE(factory));
return TRUE;
}
GstPluginDesc plugin_desc = {
GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"v4l2src",
plugin_init
};
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