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gstreamer/sys/v4l/gstv4lsrc.c
Ronald S. Bultje 863a0f81f8 This implements filtered-caps negotiation for all the v4l*src elements, and removes the accompanying properties since... 
Original commit message from CVS:
This implements filtered-caps negotiation for all the v4l*src elements, and removes the accompanying properties since they're no longer needed
2003-05-10 14:36:34 +00:00

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/* G-Streamer BT8x8/V4L frame grabber 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 <sys/time.h>
#include "v4lsrc_calls.h"
/* elementfactory information */
static GstElementDetails gst_v4lsrc_details = {
"Video (video4linux/raw) Source",
"Source/Video",
"LGPL",
"Reads raw frames from a video4linux (BT8x8) device",
VERSION,
"Ronald Bultje <rbultje@ronald.bitfreak.net>",
"(C) 2001",
};
/* V4lSrc signals and args */
enum {
/* FILL ME */
SIGNAL_FRAME_CAPTURE,
SIGNAL_FRAME_DROP,
SIGNAL_FRAME_INSERT,
LAST_SIGNAL
};
/* arguments */
enum {
ARG_0,
ARG_NUMBUFS,
ARG_BUFSIZE,
ARG_USE_FIXED_FPS
};
/* init functions */
static void gst_v4lsrc_class_init (GstV4lSrcClass *klass);
static void gst_v4lsrc_init (GstV4lSrc *v4lsrc);
/* pad/buffer functions */
static gboolean gst_v4lsrc_srcconvert (GstPad *pad,
GstFormat src_format,
gint64 src_value,
GstFormat *dest_format,
gint64 *dest_value);
static GstPadLinkReturn gst_v4lsrc_srcconnect (GstPad *pad,
GstCaps *caps);
static GstCaps* gst_v4lsrc_getcaps (GstPad *pad,
GstCaps *caps);
static GstBuffer* gst_v4lsrc_get (GstPad *pad);
/* get/set params */
static void gst_v4lsrc_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec);
static void gst_v4lsrc_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec);
/* state handling */
static GstElementStateReturn gst_v4lsrc_change_state (GstElement *element);
/* bufferpool functions */
static GstBuffer* gst_v4lsrc_buffer_new (GstBufferPool *pool,
guint64 offset,
guint size,
gpointer user_data);
static void gst_v4lsrc_buffer_free (GstBufferPool *pool,
GstBuffer *buf,
gpointer user_data);
/* set_clock function for a/V sync */
static void gst_v4lsrc_set_clock (GstElement *element,
GstClock *clock);
static GstPadTemplate *src_template = NULL;
static GstElementClass *parent_class = NULL;
static guint gst_v4lsrc_signals[LAST_SIGNAL] = { 0 };
GType
gst_v4lsrc_get_type (void)
{
static GType v4lsrc_type = 0;
if (!v4lsrc_type) {
static const GTypeInfo v4lsrc_info = {
sizeof(GstV4lSrcClass),
NULL,
NULL,
(GClassInitFunc)gst_v4lsrc_class_init,
NULL,
NULL,
sizeof(GstV4lSrc),
0,
(GInstanceInitFunc)gst_v4lsrc_init,
NULL
};
v4lsrc_type = g_type_register_static(GST_TYPE_V4LELEMENT, "GstV4lSrc", &v4lsrc_info, 0);
}
return v4lsrc_type;
}
static void
gst_v4lsrc_class_init (GstV4lSrcClass *klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = (GObjectClass*)klass;
gstelement_class = (GstElementClass*)klass;
parent_class = g_type_class_ref(GST_TYPE_V4LELEMENT);
g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_NUMBUFS,
g_param_spec_int("num_buffers","Num Buffers","Number of buffers",
G_MININT,G_MAXINT,0,G_PARAM_READABLE));
g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_BUFSIZE,
g_param_spec_int("buffer_size","Buffer Size","Size of buffers",
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_v4lsrc_signals[SIGNAL_FRAME_CAPTURE] =
g_signal_new("frame_capture", G_TYPE_FROM_CLASS(klass), G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET(GstV4lSrcClass, frame_capture),
NULL, NULL, g_cclosure_marshal_VOID__VOID,
G_TYPE_NONE, 0);
gst_v4lsrc_signals[SIGNAL_FRAME_DROP] =
g_signal_new("frame_drop", G_TYPE_FROM_CLASS(klass), G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET(GstV4lSrcClass, frame_drop),
NULL, NULL, g_cclosure_marshal_VOID__VOID,
G_TYPE_NONE, 0);
gst_v4lsrc_signals[SIGNAL_FRAME_INSERT] =
g_signal_new("frame_insert", G_TYPE_FROM_CLASS(klass), G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET(GstV4lSrcClass, frame_insert),
NULL, NULL, g_cclosure_marshal_VOID__VOID,
G_TYPE_NONE, 0);
gobject_class->set_property = gst_v4lsrc_set_property;
gobject_class->get_property = gst_v4lsrc_get_property;
gstelement_class->change_state = gst_v4lsrc_change_state;
gstelement_class->set_clock = gst_v4lsrc_set_clock;
}
static void
gst_v4lsrc_init (GstV4lSrc *v4lsrc)
{
v4lsrc->srcpad = gst_pad_new_from_template (src_template, "src");
gst_element_add_pad(GST_ELEMENT(v4lsrc), v4lsrc->srcpad);
gst_pad_set_get_function (v4lsrc->srcpad, gst_v4lsrc_get);
gst_pad_set_getcaps_function (v4lsrc->srcpad, gst_v4lsrc_getcaps);
gst_pad_set_link_function (v4lsrc->srcpad, gst_v4lsrc_srcconnect);
gst_pad_set_convert_function (v4lsrc->srcpad, gst_v4lsrc_srcconvert);
v4lsrc->bufferpool = gst_buffer_pool_new(
NULL,
NULL,
(GstBufferPoolBufferNewFunction)gst_v4lsrc_buffer_new,
NULL,
(GstBufferPoolBufferFreeFunction)gst_v4lsrc_buffer_free,
v4lsrc);
v4lsrc->buffer_size = 0;
/* no clock */
v4lsrc->clock = NULL;
/* fps */
v4lsrc->use_fixed_fps = TRUE;
}
static gdouble
gst_v4lsrc_get_fps (GstV4lSrc *v4lsrc)
{
gint norm;
gdouble fps;
if (!v4lsrc->use_fixed_fps &&
v4lsrc->clock != NULL &&
v4lsrc->handled > 0) {
/* try to get time from clock master and calculate fps */
GstClockTime time = gst_clock_get_time(v4lsrc->clock) - v4lsrc->substract_time;
return v4lsrc->handled * GST_SECOND / time;
}
/* if that failed ... */
if (!GST_V4L_IS_OPEN(GST_V4LELEMENT(v4lsrc)))
return 0.;
if (!gst_v4l_get_chan_norm(GST_V4LELEMENT(v4lsrc), NULL, &norm))
return 0.;
if (norm == VIDEO_MODE_NTSC)
fps = 30000/1001;
else
fps = 25.;
return fps;
}
static gboolean
gst_v4lsrc_srcconvert (GstPad *pad,
GstFormat src_format,
gint64 src_value,
GstFormat *dest_format,
gint64 *dest_value)
{
GstV4lSrc *v4lsrc;
gdouble fps;
v4lsrc = GST_V4LSRC (gst_pad_get_parent (pad));
if ((fps = gst_v4lsrc_get_fps(v4lsrc)) == 0)
return FALSE;
switch (src_format) {
case GST_FORMAT_TIME:
switch (*dest_format) {
case GST_FORMAT_DEFAULT:
*dest_format = GST_FORMAT_UNITS;
/* fall-through */
case GST_FORMAT_UNITS:
*dest_value = src_value * fps / GST_SECOND;
break;
default:
return FALSE;
}
break;
case GST_FORMAT_UNITS:
switch (*dest_format) {
case GST_FORMAT_DEFAULT:
*dest_format = GST_FORMAT_TIME;
/* fall-through */
case GST_FORMAT_TIME:
*dest_value = src_value * GST_SECOND / fps;
break;
default:
return FALSE;
}
break;
default:
return FALSE;
}
return TRUE;
}
static GstCaps *
gst_v4lsrc_palette_to_caps (int palette,
GstPropsEntry *width,
GstPropsEntry *height)
{
guint32 fourcc;
GstCaps *caps;
switch (palette) {
case VIDEO_PALETTE_YUV422:
case VIDEO_PALETTE_YUYV:
fourcc = GST_MAKE_FOURCC('Y','U','Y','2');
break;
case VIDEO_PALETTE_YUV420P:
fourcc = GST_MAKE_FOURCC('I','4','2','0');
break;
case VIDEO_PALETTE_UYVY:
fourcc = GST_MAKE_FOURCC('U','Y','V','Y');
break;
case VIDEO_PALETTE_YUV411:
fourcc = GST_MAKE_FOURCC('Y','4','1','P');
break;
case VIDEO_PALETTE_RGB555:
case VIDEO_PALETTE_RGB565:
case VIDEO_PALETTE_RGB24:
case VIDEO_PALETTE_RGB32:
fourcc = GST_MAKE_FOURCC('R','G','B',' ');
break;
default:
return NULL;
}
if (fourcc == GST_MAKE_FOURCC('R','G','B',' ')) {
gint depth = 0;
guint32 r_mask = 0, g_mask = 0, b_mask = 0;
switch (palette) {
case VIDEO_PALETTE_RGB555:
depth = 15;
r_mask = 0x7c00; g_mask = 0x03e0; b_mask = 0x001f;
break;
case VIDEO_PALETTE_RGB565:
depth = 16;
r_mask = 0xf800; g_mask = 0x07f0; b_mask = 0x001f;
break;
case VIDEO_PALETTE_RGB24:
depth = 24;
r_mask = 0xff0000; g_mask = 0x00ff00; b_mask = 0x0000ff;
break;
case VIDEO_PALETTE_RGB32:
depth = 32;
r_mask = 0x00ff0000; g_mask = 0x0000ff00; b_mask = 0x000000ff;
break;
default:
g_assert_not_reached();
break;
}
caps = GST_CAPS_NEW("v4lsrc_rgb_caps",
"video/raw",
"format", GST_PROPS_FOURCC(fourcc),
"bpp", GST_PROPS_INT((depth+1) & ~1),
"depth", GST_PROPS_INT(depth),
"endianness", GST_PROPS_INT(G_BYTE_ORDER),
"red_mask", GST_PROPS_INT(r_mask),
"green_mask", GST_PROPS_INT(g_mask),
"blue_mask", GST_PROPS_INT(b_mask),
NULL);
} else {
caps = GST_CAPS_NEW("v4lsrc_yuv_caps",
"video/raw",
"format", GST_PROPS_FOURCC(fourcc),
NULL);
}
gst_props_add_entry(caps->properties, width);
gst_props_add_entry(caps->properties, height);
return caps;
}
#define gst_v4lsrc_palette_to_caps_fixed(palette, width, height) \
gst_v4lsrc_palette_to_caps(palette, \
gst_props_entry_new("width", \
GST_PROPS_INT(width)), \
gst_props_entry_new("height", \
GST_PROPS_INT(height)) \
)
#define gst_v4lsrc_palette_to_caps_range(palette, min_w, max_w, min_h, max_h) \
gst_v4lsrc_palette_to_caps(palette, \
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)) \
)
#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_v4lsrc_srcconnect (GstPad *pad,
GstCaps *vscapslist)
{
GstPadLinkReturn ret_val;
GstV4lSrc *v4lsrc;
GstCaps *caps, *newcaps;
gint palette;
v4lsrc = GST_V4LSRC (gst_pad_get_parent (pad));
/* 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(v4lsrc)))
{
if (!gst_v4lsrc_capture_deinit(v4lsrc))
return GST_PAD_LINK_REFUSED;
}
else if (!GST_V4L_IS_OPEN(GST_V4LELEMENT(v4lsrc)))
{
return GST_PAD_LINK_DELAYED;
}
/* TODO: caps = gst_caps_normalize(capslist); */
for (caps = vscapslist ; caps != NULL ; caps = vscapslist = vscapslist->next)
{
guint32 fourcc;
gint depth, w, h;
gst_caps_get_fourcc_int (caps, "format", &fourcc);
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", &w, &max);
}
}
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", &h, &max);
}
}
switch (fourcc)
{
case GST_MAKE_FOURCC('I','4','2','0'):
case GST_MAKE_FOURCC('I','Y','U','V'):
palette = VIDEO_PALETTE_YUV420P;
v4lsrc->buffer_size = ((w+1)&~1) * ((h+1)&~1) * 1.5;
goto try_caps;
case GST_MAKE_FOURCC('Y','U','Y','2'):
palette = VIDEO_PALETTE_YUV422;
v4lsrc->buffer_size = ((w+1)&~1) * h * 2;
goto try_caps;
case GST_MAKE_FOURCC('U','Y','V','Y'):
palette = VIDEO_PALETTE_UYVY;
v4lsrc->buffer_size = ((w+1)&~1) * h * 2;
goto try_caps;
case GST_MAKE_FOURCC('Y','4','1','P'):
palette = VIDEO_PALETTE_YUV411;
v4lsrc->buffer_size = ((w+3)&~3) * h * 1.5;
goto try_caps;
case GST_MAKE_FOURCC('R','G','B',' '):
depth = gst_caps_get_int (caps, "depth", &depth);
switch (depth)
{
case 15:
palette = VIDEO_PALETTE_RGB555;
v4lsrc->buffer_size = w * h * 2;
goto try_caps;
case 16:
palette = VIDEO_PALETTE_RGB565;
v4lsrc->buffer_size = w * h * 2;
goto try_caps;
case 24:
palette = VIDEO_PALETTE_RGB24;
v4lsrc->buffer_size = w * h * 3;
goto try_caps;
case 32:
palette = VIDEO_PALETTE_RGB32;
v4lsrc->buffer_size = w * h * 4;
goto try_caps;
default:
goto try_next;
}
default:
goto try_next;
}
/* if this caps wasn't useful, try the next one */
try_next:
continue;
/* if this caps was useful, try it out */
try_caps:
/* try the current 'palette' out on the video device */
if (!gst_v4lsrc_try_palette(v4lsrc, palette))
continue;
/* try to connect the pad/caps with the actual width/height */
newcaps = gst_v4lsrc_palette_to_caps_fixed(palette, w, h);
gst_caps_debug (newcaps, "new caps to set on v4lsrc's src pad");
if ((ret_val = gst_pad_try_set_caps(v4lsrc->srcpad, newcaps)) == GST_PAD_LINK_REFUSED)
continue;
else if (ret_val == GST_PAD_LINK_DELAYED)
return GST_PAD_LINK_DELAYED;
if (!gst_v4lsrc_set_capture(v4lsrc, w, h, palette))
return GST_PAD_LINK_REFUSED;
if (!gst_v4lsrc_capture_init(v4lsrc))
return GST_PAD_LINK_REFUSED;
return GST_PAD_LINK_DONE;
}
/* still nothing - no good caps */
return GST_PAD_LINK_REFUSED;
}
static GstCaps *
gst_v4lsrc_getcaps (GstPad *pad,
GstCaps *caps)
{
GstCaps *list = NULL;
GstV4lSrc *v4lsrc = GST_V4LSRC(gst_pad_get_parent(pad));
int palette[] = {
VIDEO_PALETTE_YUV422,
VIDEO_PALETTE_YUV420P,
VIDEO_PALETTE_UYVY,
VIDEO_PALETTE_YUV411P,
VIDEO_PALETTE_RGB555,
VIDEO_PALETTE_RGB565,
VIDEO_PALETTE_RGB24,
VIDEO_PALETTE_RGB32,
}, i;
struct video_capability *vcap = &GST_V4LELEMENT(v4lsrc)->vcap;
if (!GST_V4L_IS_OPEN(GST_V4LELEMENT(v4lsrc))) {
return NULL;
}
for (i = 0; i < 8; i++) {
GstCaps *one;
one = gst_v4lsrc_palette_to_caps_range(palette[i],
vcap->minwidth, vcap->maxwidth,
vcap->minheight, vcap->maxheight);
list = gst_caps_append(list, one);
}
return list;
}
static GstBuffer*
gst_v4lsrc_get (GstPad *pad)
{
GstV4lSrc *v4lsrc;
GstBuffer *buf;
gint num;
gdouble fps = 0.;
g_return_val_if_fail (pad != NULL, NULL);
v4lsrc = GST_V4LSRC (gst_pad_get_parent (pad));
if (v4lsrc->use_fixed_fps &&
(fps = gst_v4lsrc_get_fps(v4lsrc)) == 0)
return NULL;
buf = gst_buffer_new_from_pool(v4lsrc->bufferpool, 0, 0);
if (!buf)
{
gst_element_error(GST_ELEMENT(v4lsrc),
"Failed to create a new GstBuffer");
return NULL;
}
if (v4lsrc->need_writes > 0) {
/* use last frame */
num = v4lsrc->last_frame;
v4lsrc->need_writes--;
} else if (v4lsrc->clock && v4lsrc->use_fixed_fps) {
GstClockTime time;
gboolean have_frame = FALSE;
do {
/* by default, we use the frame once */
v4lsrc->need_writes = 1;
/* grab a frame from the device */
if (!gst_v4lsrc_grab_frame(v4lsrc, &num))
return NULL;
v4lsrc->last_frame = num;
time = v4lsrc->timestamp_soft_sync[num] - v4lsrc->substract_time;
/* decide how often we're going to write the frame - set
* v4lsrc->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 (v4lsrc->handled * fps * GST_SECOND - time > 1.5 * fps * GST_SECOND) {
/* yo dude, we've got too many frames here! Drop! DROP! */
v4lsrc->need_writes--; /* -= (v4lsrc->handled - (time / fps)); */
g_signal_emit(G_OBJECT(v4lsrc),
gst_v4lsrc_signals[SIGNAL_FRAME_DROP], 0);
} else if (v4lsrc->handled * fps * GST_SECOND - time < - 1.5 * fps * GST_SECOND) {
/* this means we're lagging far behind */
v4lsrc->need_writes++; /* += ((time / fps) - v4lsrc->handled); */
g_signal_emit(G_OBJECT(v4lsrc),
gst_v4lsrc_signals[SIGNAL_FRAME_INSERT], 0);
}
if (v4lsrc->need_writes > 0) {
have_frame = TRUE;
v4lsrc->use_num_times[num] = v4lsrc->need_writes;
v4lsrc->need_writes--;
} else {
gst_v4lsrc_requeue_frame(v4lsrc, num);
}
} while (!have_frame);
} else {
/* grab a frame from the device */
if (!gst_v4lsrc_grab_frame(v4lsrc, &num))
return NULL;
v4lsrc->use_num_times[num] = 1;
}
GST_BUFFER_DATA(buf) = gst_v4lsrc_get_buffer(v4lsrc, num);
GST_BUFFER_SIZE(buf) = v4lsrc->buffer_size;
if (v4lsrc->use_fixed_fps)
GST_BUFFER_TIMESTAMP(buf) = v4lsrc->handled * GST_SECOND / fps;
else /* calculate time based on our own clock */
GST_BUFFER_TIMESTAMP(buf) = v4lsrc->timestamp_soft_sync[num] - v4lsrc->substract_time;
v4lsrc->handled++;
g_signal_emit(G_OBJECT(v4lsrc),
gst_v4lsrc_signals[SIGNAL_FRAME_CAPTURE], 0);
return buf;
}
static void
gst_v4lsrc_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
GstV4lSrc *v4lsrc;
g_return_if_fail(GST_IS_V4LSRC(object));
v4lsrc = GST_V4LSRC(object);
switch (prop_id) {
case ARG_USE_FIXED_FPS:
if (!GST_V4L_IS_ACTIVE(GST_V4LELEMENT(v4lsrc))) {
v4lsrc->use_fixed_fps = g_value_get_boolean(value);
}
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_v4lsrc_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
GstV4lSrc *v4lsrc;
g_return_if_fail(GST_IS_V4LSRC(object));
v4lsrc = GST_V4LSRC(object);
switch (prop_id) {
case ARG_NUMBUFS:
g_value_set_int(value, v4lsrc->mbuf.frames);
break;
case ARG_BUFSIZE:
if (v4lsrc->mbuf.frames == 0)
g_value_set_int(value, 0);
else
g_value_set_int(value, v4lsrc->mbuf.size/(v4lsrc->mbuf.frames*1024));
break;
case ARG_USE_FIXED_FPS:
g_value_set_boolean(value, v4lsrc->use_fixed_fps);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static GstElementStateReturn
gst_v4lsrc_change_state (GstElement *element)
{
GstV4lSrc *v4lsrc;
GTimeVal time;
gint transition = GST_STATE_TRANSITION (element);
g_return_val_if_fail(GST_IS_V4LSRC(element), GST_STATE_FAILURE);
v4lsrc = GST_V4LSRC(element);
switch (transition) {
case GST_STATE_NULL_TO_READY:
break;
case GST_STATE_READY_TO_PAUSED:
v4lsrc->handled = 0;
v4lsrc->need_writes = 0;
v4lsrc->last_frame = 0;
v4lsrc->substract_time = 0;
/* buffer setup used to be done here, but I moved it to
* capsnego */
break;
case GST_STATE_PAUSED_TO_PLAYING:
/* queue all buffer, start streaming capture */
if (!gst_v4lsrc_capture_start(v4lsrc))
return GST_STATE_FAILURE;
g_get_current_time(&time);
v4lsrc->substract_time = GST_TIMEVAL_TO_TIME(time) - v4lsrc->substract_time;
break;
case GST_STATE_PLAYING_TO_PAUSED:
/* de-queue all queued buffers */
if (!gst_v4lsrc_capture_stop(v4lsrc))
return GST_STATE_FAILURE;
g_get_current_time(&time);
v4lsrc->substract_time = GST_TIMEVAL_TO_TIME(time) - v4lsrc->substract_time;
break;
case GST_STATE_PAUSED_TO_READY:
/* stop capturing, unmap all buffers */
if (!gst_v4lsrc_capture_deinit(v4lsrc))
return GST_STATE_FAILURE;
break;
case GST_STATE_READY_TO_NULL:
break;
}
if (GST_ELEMENT_CLASS (parent_class)->change_state)
return GST_ELEMENT_CLASS (parent_class)->change_state (element);
return GST_STATE_SUCCESS;
}
static GstBuffer*
gst_v4lsrc_buffer_new (GstBufferPool *pool,
guint64 offset,
guint size,
gpointer user_data)
{
GstBuffer *buffer;
GstV4lSrc *v4lsrc = GST_V4LSRC(user_data);
if (!GST_V4L_IS_ACTIVE(GST_V4LELEMENT(v4lsrc)))
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) = v4lsrc->mbuf.size / v4lsrc->mbuf.frames;
GST_BUFFER_FLAG_SET(buffer, GST_BUFFER_DONTFREE);
return buffer;
}
static void
gst_v4lsrc_buffer_free (GstBufferPool *pool, GstBuffer *buf, gpointer user_data)
{
GstV4lSrc *v4lsrc = GST_V4LSRC (user_data);
int n;
if (gst_element_get_state(GST_ELEMENT(v4lsrc)) != GST_STATE_PLAYING)
return; /* we've already cleaned up ourselves */
for (n=0;n<v4lsrc->mbuf.frames;n++)
if (GST_BUFFER_DATA(buf) == gst_v4lsrc_get_buffer(v4lsrc, n))
{
v4lsrc->use_num_times[n]--;
if (v4lsrc->use_num_times[n] <= 0) {
gst_v4lsrc_requeue_frame(v4lsrc, n);
}
break;
}
if (n == v4lsrc->mbuf.frames)
gst_element_error(GST_ELEMENT(v4lsrc),
"Couldn\'t find the buffer");
/* free struct */
gst_buffer_default_free(buf);
}
static void
gst_v4lsrc_set_clock (GstElement *element,
GstClock *clock)
{
GST_V4LSRC(element)->clock = clock;
}
static gboolean
plugin_init (GModule *module,
GstPlugin *plugin)
{
GstElementFactory *factory;
/* create an elementfactory for the v4lsrc */
factory = gst_element_factory_new("v4lsrc",GST_TYPE_V4LSRC,
&gst_v4lsrc_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,
"v4lsrc",
plugin_init
};
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