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gstreamer/sys/v4l/gstv4lmjpegsrc.c
Ronald S. Bultje 91c4cbfd9b Some property finetuning 
Original commit message from CVS:
Some property finetuning
2003-11-09 20:04:08 +00:00

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27 KiB
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/* G-Streamer 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"
/* elementfactory information */
static GstElementDetails gst_v4lmjpegsrc_details = {
"Video (video4linux/MJPEG) Source",
"Source/Video",
"Reads MJPEG-encoded frames from a zoran MJPEG/video4linux device",
"Ronald Bultje <rbultje@ronald.bitfreak.net>"
};
/* 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
};
/* 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/buffer functions */
static gboolean gst_v4lmjpegsrc_srcconvert (GstPad *pad,
GstFormat src_format,
gint64 src_value,
GstFormat *dest_format,
gint64 *dest_value);
static GstPadLinkReturn gst_v4lmjpegsrc_srcconnect (GstPad *pad,
GstCaps *caps);
static GstData* gst_v4lmjpegsrc_get (GstPad *pad);
static GstCaps* gst_v4lmjpegsrc_getcaps (GstPad *pad,
GstCaps *caps);
/* 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 GstElementStateReturn gst_v4lmjpegsrc_change_state (GstElement *element);
/* bufferpool functions */
static GstBuffer* gst_v4lmjpegsrc_buffer_new (GstBufferPool *pool,
guint64 offset,
guint size,
gpointer user_data);
static void gst_v4lmjpegsrc_buffer_free (GstBufferPool *pool,
GstBuffer *buf,
gpointer user_data);
static GstCaps *capslist = NULL;
static GstPadTemplate *src_template;
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)
{
GstCaps *caps;
GstElementClass *gstelement_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_set_details (gstelement_class, &gst_v4lmjpegsrc_details);
caps = gst_caps_new ("v4lmjpegsrc_caps",
"video/x-jpeg",
gst_props_new (
"width", GST_PROPS_INT_RANGE (0, G_MAXINT),
"height", GST_PROPS_INT_RANGE (0, G_MAXINT),
"framerate", GST_PROPS_FLOAT_RANGE (0, G_MAXFLOAT),
NULL )
);
capslist = gst_caps_append(capslist, caps);
src_template = gst_pad_template_new (
"src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
capslist, NULL);
gst_element_class_add_pad_template (gstelement_class, 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_ref(GST_TYPE_V4LELEMENT);
#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_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_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_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));
#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_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_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_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_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);
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)
{
GST_FLAG_SET(GST_ELEMENT(v4lmjpegsrc), GST_ELEMENT_THREAD_SUGGESTED);
v4lmjpegsrc->srcpad = gst_pad_new_from_template (src_template, "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_srcconvert);
v4lmjpegsrc->bufferpool = gst_buffer_pool_new(
NULL,
NULL,
(GstBufferPoolBufferNewFunction)gst_v4lmjpegsrc_buffer_new,
NULL,
(GstBufferPoolBufferFreeFunction)gst_v4lmjpegsrc_buffer_free,
v4lmjpegsrc);
#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;
}
static gfloat
gst_v4lmjpegsrc_get_fps (GstV4lMjpegSrc *v4lmjpegsrc)
{
gint norm;
gfloat fps;
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 0.;
if (!gst_v4l_get_chan_norm(GST_V4LELEMENT(v4lmjpegsrc), NULL, &norm))
return 0.;
if (norm == VIDEO_MODE_NTSC)
fps = 30000/1001;
else
fps = 25.;
return fps;
}
static gboolean
gst_v4lmjpegsrc_srcconvert (GstPad *pad,
GstFormat src_format,
gint64 src_value,
GstFormat *dest_format,
gint64 *dest_value)
{
GstV4lMjpegSrc *v4lmjpegsrc;
gdouble fps;
v4lmjpegsrc = GST_V4LMJPEGSRC (gst_pad_get_parent (pad));
if ((fps = gst_v4lmjpegsrc_get_fps(v4lmjpegsrc)) == 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 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;
}
#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_v4lmjpegsrc_srcconnect (GstPad *pad,
GstCaps *caps)
{
GstPadLinkReturn ret_val;
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;
gfloat fps = gst_v4lmjpegsrc_get_fps(v4lmjpegsrc);
/* in case the buffers are active (which means that we already
* did capsnego before and didn't clean up), clean up anyways */
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 video/x-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 */
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);
}
}
/* 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
/* we now have an actual width/height - *set it* */
caps = gst_caps_new("v4lmjpegsrc_caps",
"video/x-jpeg",
gst_props_new(
"width", GST_PROPS_INT(v4lmjpegsrc->end_width),
"height", GST_PROPS_INT(v4lmjpegsrc->end_height),
"framerate", GST_PROPS_FLOAT(fps),
NULL ) );
if ((ret_val = gst_pad_try_set_caps(v4lmjpegsrc->srcpad, caps)) == GST_PAD_LINK_REFUSED)
return GST_PAD_LINK_REFUSED;
else if (ret_val == GST_PAD_LINK_DELAYED)
return GST_PAD_LINK_DELAYED;
if (!gst_v4lmjpegsrc_capture_init(v4lmjpegsrc))
return GST_PAD_LINK_REFUSED;
return GST_PAD_LINK_DONE;
}
static GstData*
gst_v4lmjpegsrc_get (GstPad *pad)
{
GstV4lMjpegSrc *v4lmjpegsrc;
GstBuffer *buf;
gint num;
gdouble fps = 0;
g_return_val_if_fail (pad != NULL, NULL);
v4lmjpegsrc = GST_V4LMJPEGSRC (gst_pad_get_parent (pad));
if (v4lmjpegsrc->use_fixed_fps &&
(fps = gst_v4lmjpegsrc_get_fps(v4lmjpegsrc)) == 0)
return NULL;
buf = gst_buffer_new_from_pool(v4lmjpegsrc->bufferpool, 0, 0);
if (!buf)
{
gst_element_error(GST_ELEMENT(v4lmjpegsrc),
"Failed to create a new GstBuffer");
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 (v4lmjpegsrc->handled * (GST_SECOND/fps) - time > 1.5 * (GST_SECOND/fps)) {
/* 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 (v4lmjpegsrc->handled * (GST_SECOND/fps) - time < - 1.5 * (GST_SECOND/fps)) {
/* 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;
}
GST_BUFFER_DATA(buf) = gst_v4lmjpegsrc_get_buffer(v4lmjpegsrc, num);
GST_BUFFER_SIZE(buf) = v4lmjpegsrc->last_size;
if (v4lmjpegsrc->use_fixed_fps)
GST_BUFFER_TIMESTAMP(buf) = v4lmjpegsrc->handled * GST_SECOND / fps;
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,
GstCaps *_caps)
{
GstV4lMjpegSrc *v4lmjpegsrc = GST_V4LMJPEGSRC(gst_pad_get_parent(pad));
struct video_capability *vcap = &GST_V4LELEMENT(v4lmjpegsrc)->vcap;
GstCaps *caps;
if (!GST_V4L_IS_OPEN(GST_V4LELEMENT(v4lmjpegsrc))) {
return NULL;
}
caps = GST_CAPS_NEW("v4lmjpegsrc_jpeg_caps",
"video/x-jpeg",
"width", GST_PROPS_INT_RANGE(vcap->maxwidth/4,
vcap->maxwidth),
"height", GST_PROPS_INT_RANGE(vcap->maxheight/4,
vcap->maxheight),
"framerate", GST_PROPS_FLOAT_RANGE(0, G_MAXFLOAT),
NULL);
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 GstElementStateReturn
gst_v4lmjpegsrc_change_state (GstElement *element)
{
GstV4lMjpegSrc *v4lmjpegsrc;
GTimeVal time;
g_return_val_if_fail(GST_IS_V4LMJPEGSRC(element), GST_STATE_FAILURE);
v4lmjpegsrc = GST_V4LMJPEGSRC(element);
switch (GST_STATE_TRANSITION(element)) {
case GST_STATE_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_PAUSED_TO_PLAYING:
/* queue all buffer, start streaming capture */
if (!gst_v4lmjpegsrc_capture_start(v4lmjpegsrc))
return GST_STATE_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_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 (!gst_v4lmjpegsrc_capture_stop(v4lmjpegsrc))
return GST_STATE_FAILURE;
break;
case GST_STATE_PAUSED_TO_READY:
/* stop capturing, unmap all buffers */
if (!gst_v4lmjpegsrc_capture_deinit(v4lmjpegsrc))
return GST_STATE_FAILURE;
break;
}
if (GST_ELEMENT_CLASS (parent_class)->change_state)
return GST_ELEMENT_CLASS (parent_class)->change_state (element);
return GST_STATE_SUCCESS;
}
static void
gst_v4lmjpegsrc_set_clock (GstElement *element,
GstClock *clock)
{
GST_V4LMJPEGSRC(element)->clock = clock;
}
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;
}
static void
gst_v4lmjpegsrc_buffer_free (GstBufferPool *pool, GstBuffer *buf, gpointer user_data)
{
GstV4lMjpegSrc *v4lmjpegsrc = GST_V4LMJPEGSRC (user_data);
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(GST_ELEMENT(v4lmjpegsrc),
"Couldn't find the buffer");
/* free the buffer struct et all */
gst_buffer_default_free(buf);
}
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