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gstreamer/sys/v4l/gstv4lmjpegsrc.c
Benjamin Otte 5e21fa5e0e gst_element_class_set_details => gst_element_class_set_details_simple 
Also change my email from the old university one to the current one.
2010-03-16 17:41:50 +01:00

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/* GStreamer
*
* gstv4lmjpegsrc.c: hardware MJPEG video source plugin
*
* Copyright (C) 2001-2002 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 "v4lmjpegsrc_calls.h"
GST_DEBUG_CATEGORY (v4lmjpegsrc_debug);
#define GST_CAT_DEFAULT v4lmjpegsrc_debug
/* V4lMjpegSrc signals and args */
enum
{
SIGNAL_FRAME_CAPTURE,
SIGNAL_FRAME_DROP,
SIGNAL_FRAME_INSERT,
SIGNAL_FRAME_LOST,
LAST_SIGNAL
};
/* arguments */
enum
{
ARG_0,
#if 0
ARG_X_OFFSET,
ARG_Y_OFFSET,
ARG_F_WIDTH,
ARG_F_HEIGHT,
/* normally, we would want to use subframe capture, however,
* for the time being it's easier if we disable it first */
#endif
ARG_QUALITY,
ARG_NUMBUFS,
ARG_BUFSIZE,
ARG_USE_FIXED_FPS
};
GST_FORMATS_FUNCTION (GstPad *, gst_v4lmjpegsrc_get_formats,
GST_FORMAT_TIME, GST_FORMAT_DEFAULT);
GST_QUERY_TYPE_FUNCTION (GstPad *, gst_v4lmjpegsrc_get_query_types,
GST_QUERY_POSITION);
/* init functions */
static void gst_v4lmjpegsrc_base_init (gpointer g_class);
static void gst_v4lmjpegsrc_class_init (GstV4lMjpegSrcClass * klass);
static void gst_v4lmjpegsrc_init (GstV4lMjpegSrc * v4lmjpegsrc);
/* pad/info functions */
static gboolean gst_v4lmjpegsrc_src_convert (GstPad * pad,
GstFormat src_format,
gint64 src_value, GstFormat * dest_format, gint64 * dest_value);
static gboolean gst_v4lmjpegsrc_src_query (GstPad * pad,
GstQueryType type, GstFormat * format, gint64 * value);
/* buffer functions */
static GstPadLinkReturn gst_v4lmjpegsrc_srcconnect (GstPad * pad,
const GstCaps * caps);
static GstData *gst_v4lmjpegsrc_get (GstPad * pad);
static GstCaps *gst_v4lmjpegsrc_getcaps (GstPad * pad);
/* get/set params */
static void gst_v4lmjpegsrc_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec);
static void gst_v4lmjpegsrc_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec);
/* set_clock function for A/V sync */
static void gst_v4lmjpegsrc_set_clock (GstElement * element, GstClock * clock);
/* state handling */
static GstStateChangeReturn gst_v4lmjpegsrc_change_state (GstElement * element);
/* requeue buffer after use */
static void gst_v4lmjpegsrc_buffer_free (GstBuffer * buffer);
static GstElementClass *parent_class = NULL;
static guint gst_v4lmjpegsrc_signals[LAST_SIGNAL] = { 0 };
GType
gst_v4lmjpegsrc_get_type (void)
{
static GType v4lmjpegsrc_type = 0;
if (!v4lmjpegsrc_type) {
static const GTypeInfo v4lmjpegsrc_info = {
sizeof (GstV4lMjpegSrcClass),
gst_v4lmjpegsrc_base_init,
NULL,
(GClassInitFunc) gst_v4lmjpegsrc_class_init,
NULL,
NULL,
sizeof (GstV4lMjpegSrc),
0,
(GInstanceInitFunc) gst_v4lmjpegsrc_init,
NULL
};
v4lmjpegsrc_type =
g_type_register_static (GST_TYPE_V4LELEMENT, "GstV4lMjpegSrc",
&v4lmjpegsrc_info, 0);
}
return v4lmjpegsrc_type;
}
static void
gst_v4lmjpegsrc_base_init (gpointer g_class)
{
static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("image/jpeg, "
"width = (int) [ 0, MAX ], "
"height = (int) [ 0, MAX ], " "framerate = (fraction) [ 0, MAX ]")
);
GstElementClass *gstelement_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_set_details_sinmple (gstelement_class,
"Video (video4linux/MJPEG) Source", "Source/Video",
"Reads MJPEG-encoded frames from a zoran MJPEG/video4linux device",
"GStreamer maintainers <gstreamer-devel@lists.sourceforge.net>");
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&src_template));
}
static void
gst_v4lmjpegsrc_class_init (GstV4lMjpegSrcClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
parent_class = g_type_class_peek_parent (klass);
#if 0
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_X_OFFSET,
g_param_spec_int ("x-offset", "x_offset", "x_offset",
G_MININT, G_MAXINT, 0, G_PARAM_WRITABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_Y_OFFSET,
g_param_spec_int ("y-offset", "y_offset", "y_offset",
G_MININT, G_MAXINT, 0, G_PARAM_WRITABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_F_WIDTH,
g_param_spec_int ("frame-width", "frame_width", "frame_width",
G_MININT, G_MAXINT, 0, G_PARAM_WRITABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_F_HEIGHT,
g_param_spec_int ("frame-height", "frame_height", "frame_height",
G_MININT, G_MAXINT, 0, G_PARAM_WRITABLE | G_PARAM_STATIC_STRINGS));
#endif
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_QUALITY,
g_param_spec_int ("quality", "Quality", "JPEG frame quality",
1, 100, 50, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_NUMBUFS,
g_param_spec_int ("num-buffers", "Num Buffers", "Number of Buffers",
1, 256, 64, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_BUFSIZE,
g_param_spec_int ("buffer-size", "Buffer Size", "Size of buffers",
0, 512 * 1024, 128 * 1024,
G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
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 grabbed frames",
TRUE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/* signals */
gst_v4lmjpegsrc_signals[SIGNAL_FRAME_CAPTURE] =
g_signal_new ("frame-capture", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstV4lMjpegSrcClass, frame_capture),
NULL, NULL, g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
gst_v4lmjpegsrc_signals[SIGNAL_FRAME_DROP] =
g_signal_new ("frame-drop", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GstV4lMjpegSrcClass, frame_drop), NULL, NULL,
g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
gst_v4lmjpegsrc_signals[SIGNAL_FRAME_INSERT] =
g_signal_new ("frame-insert", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstV4lMjpegSrcClass, frame_insert),
NULL, NULL, g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
gst_v4lmjpegsrc_signals[SIGNAL_FRAME_LOST] =
g_signal_new ("frame-lost", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GstV4lMjpegSrcClass, frame_lost), NULL, NULL,
g_cclosure_marshal_VOID__INT, G_TYPE_NONE, 1, G_TYPE_INT);
GST_DEBUG_CATEGORY_INIT (v4lmjpegsrc_debug, "v4lmjpegsrc", 0,
"V4L MJPEG source element");
gobject_class->set_property = gst_v4lmjpegsrc_set_property;
gobject_class->get_property = gst_v4lmjpegsrc_get_property;
gstelement_class->change_state = gst_v4lmjpegsrc_change_state;
gstelement_class->set_clock = gst_v4lmjpegsrc_set_clock;
}
static void
gst_v4lmjpegsrc_init (GstV4lMjpegSrc * v4lmjpegsrc)
{
GstElementClass *klass = GST_ELEMENT_GET_CLASS (v4lmjpegsrc);
GST_OBJECT_FLAG_SET (GST_ELEMENT (v4lmjpegsrc), GST_ELEMENT_THREAD_SUGGESTED);
v4lmjpegsrc->srcpad =
gst_pad_new_from_template (gst_element_class_get_pad_template (klass,
"src"), "src");
gst_element_add_pad (GST_ELEMENT (v4lmjpegsrc), v4lmjpegsrc->srcpad);
gst_pad_set_get_function (v4lmjpegsrc->srcpad, gst_v4lmjpegsrc_get);
gst_pad_set_getcaps_function (v4lmjpegsrc->srcpad, gst_v4lmjpegsrc_getcaps);
gst_pad_set_link_function (v4lmjpegsrc->srcpad, gst_v4lmjpegsrc_srcconnect);
gst_pad_set_convert_function (v4lmjpegsrc->srcpad,
gst_v4lmjpegsrc_src_convert);
gst_pad_set_formats_function (v4lmjpegsrc->srcpad,
gst_v4lmjpegsrc_get_formats);
gst_pad_set_query_function (v4lmjpegsrc->srcpad, gst_v4lmjpegsrc_src_query);
gst_pad_set_query_type_function (v4lmjpegsrc->srcpad,
gst_v4lmjpegsrc_get_query_types);
#if 0
v4lmjpegsrc->frame_width = 0;
v4lmjpegsrc->frame_height = 0;
v4lmjpegsrc->x_offset = -1;
v4lmjpegsrc->y_offset = -1;
#endif
v4lmjpegsrc->quality = 50;
v4lmjpegsrc->numbufs = 64;
/* no clock */
v4lmjpegsrc->clock = NULL;
/* fps */
v4lmjpegsrc->use_fixed_fps = TRUE;
v4lmjpegsrc->is_capturing = FALSE;
}
static gboolean
gst_v4lmjpegsrc_get_fps (GstV4lMjpegSrc * v4lmjpegsrc, GValue * fps)
{
gint norm;
g_return_val_if_fail (GST_VALUE_HOLDS_FRACTION (fps), FALSE);
if (!v4lmjpegsrc->use_fixed_fps &&
v4lmjpegsrc->clock != NULL && v4lmjpegsrc->handled > 0) {
/* try to get time from clock master and calculate fps */
GstClockTime time =
gst_clock_get_time (v4lmjpegsrc->clock) - v4lmjpegsrc->substract_time;
return v4lmjpegsrc->handled * GST_SECOND / time;
}
/* if that failed ... */
if (!GST_V4L_IS_OPEN (GST_V4LELEMENT (v4lmjpegsrc)))
return FALSE;
if (!gst_v4l_get_chan_norm (GST_V4LELEMENT (v4lmjpegsrc), NULL, &norm))
return FALSE;
if (norm == VIDEO_MODE_NTSC)
gst_value_set_fraction (fps, 30000, 1001);
else
gst_value_set_fraction (fps, 25, 1);
return TRUE;
}
static gboolean
gst_v4lmjpegsrc_src_convert (GstPad * pad,
GstFormat src_format,
gint64 src_value, GstFormat * dest_format, gint64 * dest_value)
{
GstV4lMjpegSrc *v4lmjpegsrc;
GValue fps = { 0 };
gboolean result = TRUE;
v4lmjpegsrc = GST_V4LMJPEGSRC (gst_pad_get_parent (pad));
g_value_init (&fps, GST_VALUE_FRACTION);
if (!gst_v4lmjpegsrc_get_fps (v4lmjpegsrc, &fps))
return FALSE;
switch (src_format) {
case GST_FORMAT_TIME:
switch (*dest_format) {
case GST_FORMAT_DEFAULT:
*dest_value = gst_util_uint64_scale (src_value,
gst_value_get_fraction_numerator (&fps),
gst_value_get_fraction_denominator (&fps) * GST_SECOND);
break;
default:
result = FALSE;
}
break;
case GST_FORMAT_DEFAULT:
switch (*dest_format) {
case GST_FORMAT_TIME:
*dest_value = src_value * gst_util_uint64_scale_int (GST_SECOND,
gst_value_get_fraction_denominator (&fps),
gst_value_get_fraction_numerator (&fps));
break;
default:
result = FALSE;
}
break;
default:
result = FALSE;
}
g_value_unset (&fps);
return result;
}
static gboolean
gst_v4lmjpegsrc_src_query (GstPad * pad,
GstQueryType type, GstFormat * format, gint64 * value)
{
GstV4lMjpegSrc *v4lmjpegsrc = GST_V4LMJPEGSRC (gst_pad_get_parent (pad));
gboolean res = TRUE;
GValue fps = { 0 };
g_value_init (&fps, GST_VALUE_FRACTION);
if (!gst_v4lmjpegsrc_get_fps (v4lmjpegsrc, &fps))
return FALSE;
switch (type) {
case GST_QUERY_POSITION:
switch (*format) {
case GST_FORMAT_TIME:
*value = v4lmjpegsrc->handled * gst_util_uint64_scale_int (GST_SECOND,
gst_value_get_fraction_denominator (&fps),
gst_value_get_fraction_numerator (&fps));
break;
case GST_FORMAT_DEFAULT:
*value = v4lmjpegsrc->handled;
break;
default:
res = FALSE;
break;
}
break;
default:
res = FALSE;
break;
}
g_value_unset (&fps);
return res;
}
static inline gulong
calc_bufsize (int hor_dec, int ver_dec)
{
guint8 div = hor_dec * ver_dec;
guint32 num = (1024 * 512) / (div);
guint32 result = 2;
num--;
while (num) {
num >>= 1;
result <<= 1;
}
if (result > (512 * 1024))
return (512 * 1024);
if (result < 8192)
return 8192;
return result;
}
static GstPadLinkReturn
gst_v4lmjpegsrc_srcconnect (GstPad * pad, const GstCaps * caps)
{
GstV4lMjpegSrc *v4lmjpegsrc = GST_V4LMJPEGSRC (gst_pad_get_parent (pad));
gint hor_dec, ver_dec;
gint w, h;
gint max_w = GST_V4LELEMENT (v4lmjpegsrc)->vcap.maxwidth,
max_h = GST_V4LELEMENT (v4lmjpegsrc)->vcap.maxheight;
gulong bufsize;
GstStructure *structure;
gboolean was_capturing;
/* in case the buffers are active (which means that we already
* did capsnego before and didn't clean up), clean up anyways */
if ((was_capturing = v4lmjpegsrc->is_capturing)) {
if (!gst_v4lmjpegsrc_capture_stop (v4lmjpegsrc))
return GST_PAD_LINK_REFUSED;
}
if (GST_V4L_IS_ACTIVE (GST_V4LELEMENT (v4lmjpegsrc))) {
if (!gst_v4lmjpegsrc_capture_deinit (v4lmjpegsrc))
return GST_PAD_LINK_REFUSED;
} else if (!GST_V4L_IS_OPEN (GST_V4LELEMENT (v4lmjpegsrc))) {
return GST_PAD_LINK_DELAYED;
}
/* Note: basically, we don't give a damn about the opposite caps here.
* that might seem odd, but it isn't. we know that the opposite caps is
* either NULL or has mime type image/jpeg, and in both cases, we'll set
* our own mime type back and it'll work. Other properties are to be set
* by the src, not by the opposite caps */
structure = gst_caps_get_structure (caps, 0);
gst_structure_get_int (structure, "width", &w);
gst_structure_get_int (structure, "height", &h);
/* figure out decimation */
if (w >= max_w) {
hor_dec = 1;
} else if (w * 2 >= max_w) {
hor_dec = 2;
} else {
hor_dec = 4;
}
if (h >= max_h) {
ver_dec = 1;
} else if (h * 2 >= max_h) {
ver_dec = 2;
} else {
ver_dec = 4;
}
/* calculate bufsize */
bufsize = calc_bufsize (hor_dec, ver_dec);
/* set buffer info */
if (!gst_v4lmjpegsrc_set_buffer (v4lmjpegsrc, v4lmjpegsrc->numbufs, bufsize)) {
return GST_PAD_LINK_REFUSED;
}
/* set capture parameters and mmap the buffers */
if (hor_dec == ver_dec) {
if (!gst_v4lmjpegsrc_set_capture (v4lmjpegsrc,
hor_dec, v4lmjpegsrc->quality)) {
return GST_PAD_LINK_REFUSED;
}
} else {
if (!gst_v4lmjpegsrc_set_capture_m (v4lmjpegsrc,
0, 0, max_w, max_h, hor_dec, ver_dec, v4lmjpegsrc->quality)) {
return GST_PAD_LINK_REFUSED;
}
}
#if 0
if (!v4lmjpegsrc->frame_width && !v4lmjpegsrc->frame_height &&
v4lmjpegsrc->x_offset < 0 && v4lmjpegsrc->y_offset < 0 &&
v4lmjpegsrc->horizontal_decimation == v4lmjpegsrc->vertical_decimation) {
if (!gst_v4lmjpegsrc_set_capture (v4lmjpegsrc,
v4lmjpegsrc->horizontal_decimation, v4lmjpegsrc->quality))
return GST_PAD_LINK_REFUSED;
} else {
if (!gst_v4lmjpegsrc_set_capture_m (v4lmjpegsrc,
v4lmjpegsrc->x_offset, v4lmjpegsrc->y_offset,
v4lmjpegsrc->frame_width, v4lmjpegsrc->frame_height,
v4lmjpegsrc->horizontal_decimation,
v4lmjpegsrc->vertical_decimation, v4lmjpegsrc->quality))
return GST_PAD_LINK_REFUSED;
}
#endif
if (!gst_v4lmjpegsrc_capture_init (v4lmjpegsrc))
return GST_PAD_LINK_REFUSED;
if (was_capturing || GST_STATE (v4lmjpegsrc) == GST_STATE_PLAYING)
if (!gst_v4lmjpegsrc_capture_start (v4lmjpegsrc))
return GST_PAD_LINK_REFUSED;
return GST_PAD_LINK_OK;
}
static GstData *
gst_v4lmjpegsrc_get (GstPad * pad)
{
GstV4lMjpegSrc *v4lmjpegsrc;
GstBuffer *buf;
gint num;
GValue fps = { 0 };
GstClockTime duration;
GstClockTime cur_frame_time;
g_return_val_if_fail (pad != NULL, NULL);
v4lmjpegsrc = GST_V4LMJPEGSRC (gst_pad_get_parent (pad));
if (v4lmjpegsrc->use_fixed_fps) {
g_value_init (&fps, GST_VALUE_FRACTION);
duration = gst_util_uint64_scale_int (GST_SECOND,
gst_value_get_fraction_denominator (&fps),
gst_value_get_fraction_numerator (&fps));
cur_frame_time =
gst_util_uint64_scale_int (v4lmjpegsrc->handled * GST_SECOND,
gst_value_get_fraction_denominator (&fps),
gst_value_get_fraction_numerator (&fps));
if (!gst_v4lmjpegsrc_get_fps (v4lmjpegsrc, &fps)) {
g_value_unset (&fps);
return NULL;
}
}
if (v4lmjpegsrc->need_writes > 0) {
/* use last frame */
num = v4lmjpegsrc->last_frame;
v4lmjpegsrc->need_writes--;
} else if (v4lmjpegsrc->clock && v4lmjpegsrc->use_fixed_fps) {
GstClockTime time;
gboolean have_frame = FALSE;
do {
/* by default, we use the frame once */
v4lmjpegsrc->need_writes = 1;
/* grab a frame from the device */
if (!gst_v4lmjpegsrc_grab_frame (v4lmjpegsrc, &num,
&v4lmjpegsrc->last_size))
return NULL;
v4lmjpegsrc->last_frame = num;
time = GST_TIMEVAL_TO_TIME (v4lmjpegsrc->bsync.timestamp) -
v4lmjpegsrc->substract_time;
/* first check whether we lost any frames according to the device */
if (v4lmjpegsrc->last_seq != 0) {
if (v4lmjpegsrc->bsync.seq - v4lmjpegsrc->last_seq > 1) {
v4lmjpegsrc->need_writes =
v4lmjpegsrc->bsync.seq - v4lmjpegsrc->last_seq;
g_signal_emit (G_OBJECT (v4lmjpegsrc),
gst_v4lmjpegsrc_signals[SIGNAL_FRAME_LOST], 0,
v4lmjpegsrc->bsync.seq - v4lmjpegsrc->last_seq - 1);
}
}
v4lmjpegsrc->last_seq = v4lmjpegsrc->bsync.seq;
/* 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 (cur_frame_time - time > 1.5 * duration) {
/* yo dude, we've got too many frames here! Drop! DROP! */
v4lmjpegsrc->need_writes--; /* -= (v4lmjpegsrc->handled - (time / fps)); */
g_signal_emit (G_OBJECT (v4lmjpegsrc),
gst_v4lmjpegsrc_signals[SIGNAL_FRAME_DROP], 0);
} else if (cur_frame_time - time < -1.5 * duration) {
/* this means we're lagging far behind */
v4lmjpegsrc->need_writes++; /* += ((time / fps) - v4lmjpegsrc->handled); */
g_signal_emit (G_OBJECT (v4lmjpegsrc),
gst_v4lmjpegsrc_signals[SIGNAL_FRAME_INSERT], 0);
}
if (v4lmjpegsrc->need_writes > 0) {
have_frame = TRUE;
v4lmjpegsrc->use_num_times[num] = v4lmjpegsrc->need_writes;
v4lmjpegsrc->need_writes--;
} else {
gst_v4lmjpegsrc_requeue_frame (v4lmjpegsrc, num);
}
} while (!have_frame);
} else {
/* grab a frame from the device */
if (!gst_v4lmjpegsrc_grab_frame (v4lmjpegsrc, &num,
&v4lmjpegsrc->last_size))
return NULL;
v4lmjpegsrc->use_num_times[num] = 1;
}
buf = gst_buffer_new ();
GST_BUFFER_FREE_DATA_FUNC (buf) = gst_v4lmjpegsrc_buffer_free;
GST_BUFFER_PRIVATE (buf) = v4lmjpegsrc;
GST_BUFFER_DATA (buf) = gst_v4lmjpegsrc_get_buffer (v4lmjpegsrc, num);
GST_BUFFER_SIZE (buf) = v4lmjpegsrc->last_size;
GST_BUFFER_MAXSIZE (buf) = v4lmjpegsrc->breq.size;
GST_BUFFER_FLAG_SET (buf, GST_BUFFER_READONLY);
GST_BUFFER_FLAG_SET (buf, GST_BUFFER_DONTFREE);
if (v4lmjpegsrc->use_fixed_fps)
GST_BUFFER_TIMESTAMP (buf) = cur_frame_time;
else /* calculate time based on our own clock */
GST_BUFFER_TIMESTAMP (buf) =
GST_TIMEVAL_TO_TIME (v4lmjpegsrc->bsync.timestamp) -
v4lmjpegsrc->substract_time;
v4lmjpegsrc->handled++;
g_signal_emit (G_OBJECT (v4lmjpegsrc),
gst_v4lmjpegsrc_signals[SIGNAL_FRAME_CAPTURE], 0);
return GST_DATA (buf);
}
static GstCaps *
gst_v4lmjpegsrc_getcaps (GstPad * pad)
{
GstV4lMjpegSrc *v4lmjpegsrc = GST_V4LMJPEGSRC (gst_pad_get_parent (pad));
struct video_capability *vcap = &GST_V4LELEMENT (v4lmjpegsrc)->vcap;
GstCaps *caps;
GstStructure *str;
gint i;
GValue w = { 0 }, h = {
0}, w1 = {
0}, h1 = {
0}, fps = {
0};
if (!GST_V4L_IS_OPEN (GST_V4LELEMENT (v4lmjpegsrc))) {
return gst_caps_copy (gst_pad_get_pad_template_caps (pad));
}
g_value_init (&fps, GST_TYPE_FRACTION);
gst_return_val_if_fail (gst_v4lmjpegsrc_get_fps (v4lmjpegsrc, &fps), NULL);
caps = gst_caps_new_simple ("image/jpeg", NULL);
str = gst_caps_get_structure (caps, 0);
gst_structure_set_value (str, "framerate", &fps);
g_value_unset (&fps);
g_value_init (&w, GST_TYPE_LIST);
g_value_init (&h, GST_TYPE_LIST);
g_value_init (&w1, G_TYPE_INT);
g_value_init (&h1, G_TYPE_INT);
for (i = 0; i <= 2; i++) {
g_value_set_int (&w1, vcap->maxwidth / (1 << i));
g_value_set_int (&h1, vcap->maxheight / (1 << i));
gst_value_list_append_value (&w, &w1);
gst_value_list_append_value (&h, &h1);
}
g_value_unset (&h1);
g_value_unset (&w1);
gst_structure_set_value (str, "width", &w);
gst_structure_set_value (str, "height", &h);
g_value_unset (&w);
g_value_unset (&h);
return caps;
}
static void
gst_v4lmjpegsrc_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec)
{
GstV4lMjpegSrc *v4lmjpegsrc;
g_return_if_fail (GST_IS_V4LMJPEGSRC (object));
v4lmjpegsrc = GST_V4LMJPEGSRC (object);
switch (prop_id) {
#if 0
case ARG_X_OFFSET:
v4lmjpegsrc->x_offset = g_value_get_int (value);
break;
case ARG_Y_OFFSET:
v4lmjpegsrc->y_offset = g_value_get_int (value);
break;
case ARG_F_WIDTH:
v4lmjpegsrc->frame_width = g_value_get_int (value);
break;
case ARG_F_HEIGHT:
v4lmjpegsrc->frame_height = g_value_get_int (value);
break;
#endif
case ARG_QUALITY:
v4lmjpegsrc->quality = g_value_get_int (value);
break;
case ARG_NUMBUFS:
v4lmjpegsrc->numbufs = g_value_get_int (value);
break;
case ARG_USE_FIXED_FPS:
if (!GST_V4L_IS_ACTIVE (GST_V4LELEMENT (v4lmjpegsrc))) {
v4lmjpegsrc->use_fixed_fps = g_value_get_boolean (value);
}
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_v4lmjpegsrc_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec)
{
GstV4lMjpegSrc *v4lmjpegsrc;
g_return_if_fail (GST_IS_V4LMJPEGSRC (object));
v4lmjpegsrc = GST_V4LMJPEGSRC (object);
switch (prop_id) {
#if 0
case ARG_X_OFFSET:
g_value_set_int (value, v4lmjpegsrc->x_offset);
break;
case ARG_Y_OFFSET:
g_value_set_int (value, v4lmjpegsrc->y_offset);
break;
case ARG_F_WIDTH:
g_value_set_int (value, v4lmjpegsrc->frame_width);
break;
case ARG_F_HEIGHT:
g_value_set_int (value, v4lmjpegsrc->frame_height);
break;
#endif
case ARG_QUALITY:
g_value_set_int (value, v4lmjpegsrc->quality);
break;
case ARG_NUMBUFS:
if (GST_V4L_IS_ACTIVE (GST_V4LELEMENT (v4lmjpegsrc)))
g_value_set_int (value, v4lmjpegsrc->breq.count);
else
g_value_set_int (value, v4lmjpegsrc->numbufs);
break;
case ARG_BUFSIZE:
g_value_set_int (value, v4lmjpegsrc->breq.size);
break;
case ARG_USE_FIXED_FPS:
g_value_set_boolean (value, v4lmjpegsrc->use_fixed_fps);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static GstStateChangeReturn
gst_v4lmjpegsrc_change_state (GstElement * element, GstStateChange transition)
{
GstV4lMjpegSrc *v4lmjpegsrc;
GTimeVal time;
g_return_val_if_fail (GST_IS_V4LMJPEGSRC (element), GST_STATE_CHANGE_FAILURE);
v4lmjpegsrc = GST_V4LMJPEGSRC (element);
switch (transition) {
case GST_STATE_CHANGE_READY_TO_PAUSED:
/* actual buffer set-up used to be done here - but I moved
* it to capsnego itself */
v4lmjpegsrc->handled = 0;
v4lmjpegsrc->need_writes = 0;
v4lmjpegsrc->last_frame = 0;
v4lmjpegsrc->substract_time = 0;
break;
case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
/* queue all buffer, start streaming capture */
if (GST_V4LELEMENT (v4lmjpegsrc)->buffer &&
!gst_v4lmjpegsrc_capture_start (v4lmjpegsrc))
return GST_STATE_CHANGE_FAILURE;
g_get_current_time (&time);
v4lmjpegsrc->substract_time = GST_TIMEVAL_TO_TIME (time) -
v4lmjpegsrc->substract_time;
v4lmjpegsrc->last_seq = 0;
break;
case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
g_get_current_time (&time);
v4lmjpegsrc->substract_time = GST_TIMEVAL_TO_TIME (time) -
v4lmjpegsrc->substract_time;
/* de-queue all queued buffers */
if (v4lmjpegsrc->is_capturing &&
!gst_v4lmjpegsrc_capture_stop (v4lmjpegsrc))
return GST_STATE_CHANGE_FAILURE;
break;
case GST_STATE_CHANGE_PAUSED_TO_READY:
/* stop capturing, unmap all buffers */
if (GST_V4LELEMENT (v4lmjpegsrc)->buffer &&
!gst_v4lmjpegsrc_capture_deinit (v4lmjpegsrc))
return GST_STATE_CHANGE_FAILURE;
break;
}
if (GST_ELEMENT_CLASS (parent_class)->change_state)
return GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
return GST_STATE_CHANGE_SUCCESS;
}
static void
gst_v4lmjpegsrc_set_clock (GstElement * element, GstClock * clock)
{
GST_V4LMJPEGSRC (element)->clock = clock;
}
#if 0
static GstBuffer *
gst_v4lmjpegsrc_buffer_new (GstBufferPool * pool,
guint64 offset, guint size, gpointer user_data)
{
GstBuffer *buffer;
GstV4lMjpegSrc *v4lmjpegsrc = GST_V4LMJPEGSRC (user_data);
if (!GST_V4L_IS_ACTIVE (GST_V4LELEMENT (v4lmjpegsrc)))
return NULL;
buffer = gst_buffer_new ();
if (!buffer)
return NULL;
/* TODO: add interlacing info to buffer as metadata */
GST_BUFFER_MAXSIZE (buffer) = v4lmjpegsrc->breq.size;
GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_DONTFREE);
return buffer;
}
#endif
static void
gst_v4lmjpegsrc_buffer_free (GstBuffer * buf)
{
GstV4lMjpegSrc *v4lmjpegsrc = GST_V4LMJPEGSRC (GST_BUFFER_PRIVATE (buf));
int n;
if (gst_element_get_state (GST_ELEMENT (v4lmjpegsrc)) != GST_STATE_PLAYING)
return; /* we've already cleaned up ourselves */
for (n = 0; n < v4lmjpegsrc->breq.count; n++)
if (GST_BUFFER_DATA (buf) == gst_v4lmjpegsrc_get_buffer (v4lmjpegsrc, n)) {
v4lmjpegsrc->use_num_times[n]--;
if (v4lmjpegsrc->use_num_times[n] <= 0) {
gst_v4lmjpegsrc_requeue_frame (v4lmjpegsrc, n);
}
break;
}
if (n == v4lmjpegsrc->breq.count)
GST_ELEMENT_ERROR (v4lmjpegsrc, RESOURCE, TOO_LAZY, (NULL),
("Couldn't find the buffer"));
}
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