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gstreamer/sys/v4l/gstv4lsrc.c
Thomas Vander Stichele 7da21bd2e8 query v4lsrc device for fps (which works for webcams) 
Original commit message from CVS:
query v4lsrc device for fps (which works for webcams)
2004-05-03 17:26:43 +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 =
GST_ELEMENT_DETAILS ("Video (video4linux/raw) Source",
"Source/Video",
"Reads raw frames from a video4linux (BT8x8) device",
"Ronald Bultje <rbultje@ronald.bitfreak.net>");
GST_DEBUG_CATEGORY (v4lsrc_debug);
#define GST_CAT_DEFAULT v4lsrc_debug
/* 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
};
GST_FORMATS_FUNCTION (GstPad *, gst_v4lsrc_get_formats,
GST_FORMAT_TIME, GST_FORMAT_DEFAULT);
GST_QUERY_TYPE_FUNCTION (GstPad *, gst_v4lsrc_get_query_types,
GST_QUERY_POSITION);
/* structure for buffer private data referencing element and frame number */
typedef struct
{
GstV4lSrc *v4lsrc;
int num;
}
v4lsrc_private_t;
/* init functions */
static void gst_v4lsrc_base_init (gpointer g_class);
static void gst_v4lsrc_class_init (GstV4lSrcClass * klass);
static void gst_v4lsrc_init (GstV4lSrc * v4lsrc);
/* parent class virtual functions */
static void gst_v4lsrc_open (GstElement * element, const gchar * device);
static void gst_v4lsrc_close (GstElement * element, const gchar * device);
/* pad/info functions */
static gboolean gst_v4lsrc_src_convert (GstPad * pad,
GstFormat src_format,
gint64 src_value, GstFormat * dest_format, gint64 * dest_value);
static gboolean gst_v4lsrc_src_query (GstPad * pad,
GstQueryType type, GstFormat * format, gint64 * value);
/* buffer functions */
static GstPadLinkReturn gst_v4lsrc_srcconnect (GstPad * pad,
const GstCaps * caps);
static GstCaps *gst_v4lsrc_fixate (GstPad * pad, const GstCaps * caps);
static GstCaps *gst_v4lsrc_getcaps (GstPad * pad);
static GstData *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);
/* set_clock function for a/V sync */
static void gst_v4lsrc_set_clock (GstElement * element, GstClock * clock);
/* requeue buffer if it's back available */
static void gst_v4lsrc_buffer_free (GstBuffer * buffer);
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),
gst_v4lsrc_base_init,
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_base_init (gpointer g_class)
{
GstPadTemplate *src_template;
GstElementClass *gstelement_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_set_details (gstelement_class, &gst_v4lsrc_details);
src_template = gst_pad_template_new ("src",
GST_PAD_SRC, GST_PAD_ALWAYS, gst_caps_new_any ());
gst_element_class_add_pad_template (gstelement_class, src_template);
}
static void
gst_v4lsrc_class_init (GstV4lSrcClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
GstV4lElementClass *v4lelement_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
v4lelement_class = (GstV4lElementClass *) 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",
0, 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",
0, 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 grabbed 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);
GST_DEBUG_CATEGORY_INIT (v4lsrc_debug, "v4lsrc", 0, "V4L source element");
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;
v4lelement_class->open = gst_v4lsrc_open;
v4lelement_class->close = gst_v4lsrc_close;
}
static void
gst_v4lsrc_init (GstV4lSrc * v4lsrc)
{
GstElementClass *klass = GST_ELEMENT_GET_CLASS (v4lsrc);
GST_FLAG_SET (GST_ELEMENT (v4lsrc), GST_ELEMENT_THREAD_SUGGESTED);
v4lsrc->srcpad =
gst_pad_new_from_template (gst_element_class_get_pad_template (klass,
"src"), "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_fixate_function (v4lsrc->srcpad, gst_v4lsrc_fixate);
gst_pad_set_link_function (v4lsrc->srcpad, gst_v4lsrc_srcconnect);
gst_pad_set_convert_function (v4lsrc->srcpad, gst_v4lsrc_src_convert);
gst_pad_set_formats_function (v4lsrc->srcpad, gst_v4lsrc_get_formats);
gst_pad_set_query_function (v4lsrc->srcpad, gst_v4lsrc_src_query);
gst_pad_set_query_type_function (v4lsrc->srcpad, gst_v4lsrc_get_query_types);
v4lsrc->buffer_size = 0;
/* no clock */
v4lsrc->clock = NULL;
/* no colourspaces */
v4lsrc->colourspaces = NULL;
/* fps */
v4lsrc->use_fixed_fps = TRUE;
v4lsrc->is_capturing = FALSE;
}
static void
gst_v4lsrc_open (GstElement * element, const gchar * device)
{
GstV4lSrc *v4lsrc = GST_V4LSRC (element);
int palette[] = {
VIDEO_PALETTE_YUV422,
VIDEO_PALETTE_YUV420P,
VIDEO_PALETTE_UYVY,
VIDEO_PALETTE_YUV411P,
VIDEO_PALETTE_YUV422P,
VIDEO_PALETTE_YUV410P,
VIDEO_PALETTE_YUV411,
VIDEO_PALETTE_RGB555,
VIDEO_PALETTE_RGB565,
VIDEO_PALETTE_RGB24,
VIDEO_PALETTE_RGB32,
-1
}, i;
for (i = 0; palette[i] != -1; i++) {
/* try palette out */
if (!gst_v4lsrc_try_palette (v4lsrc, palette[i]))
continue;
v4lsrc->colourspaces = g_list_append (v4lsrc->colourspaces,
GINT_TO_POINTER (palette[i]));
}
}
static void
gst_v4lsrc_close (GstElement * element, const gchar * device)
{
GstV4lSrc *v4lsrc = GST_V4LSRC (element);
g_list_free (v4lsrc->colourspaces);
v4lsrc->colourspaces = NULL;
}
static gfloat
gst_v4lsrc_get_fps (GstV4lSrc * v4lsrc)
{
gint norm;
gint fps_index;
gfloat fps;
struct video_window *vwin = &GST_V4LELEMENT (v4lsrc)->vwin;
/* check if we have vwin window properties giving a framerate,
* as is done for webcams
* See http://www.smcc.demon.nl/webcam/api.html
* which is used for the Philips and qce-ga drivers */
fps_index = (vwin->flags >> 16) & 0x3F; /* 6 bit index for framerate */
if (fps_index != 0)
/* index of 16 corresponds to 15 fps */
return fps_index * 15.0 / 16;
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_src_convert (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_value = src_value * fps / GST_SECOND;
break;
default:
return FALSE;
}
break;
case GST_FORMAT_DEFAULT:
switch (*dest_format) {
case GST_FORMAT_TIME:
*dest_value = src_value * GST_SECOND / fps;
break;
default:
return FALSE;
}
break;
default:
return FALSE;
}
return TRUE;
}
static gboolean
gst_v4lsrc_src_query (GstPad * pad,
GstQueryType type, GstFormat * format, gint64 * value)
{
GstV4lSrc *v4lsrc = GST_V4LSRC (gst_pad_get_parent (pad));
gboolean res = TRUE;
gdouble fps;
if ((fps = gst_v4lsrc_get_fps (v4lsrc)) == 0)
return FALSE;
switch (type) {
case GST_QUERY_POSITION:
switch (*format) {
case GST_FORMAT_TIME:
*value = v4lsrc->handled * GST_SECOND / fps;
break;
case GST_FORMAT_DEFAULT:
*value = v4lsrc->handled;
break;
default:
res = FALSE;
break;
}
break;
default:
res = FALSE;
break;
}
return res;
}
static GstCaps *
gst_v4lsrc_palette_to_caps (int palette)
{
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_YUV411P:
fourcc = GST_MAKE_FOURCC ('Y', '4', '1', 'B');
break;
case VIDEO_PALETTE_YUV411:
fourcc = GST_MAKE_FOURCC ('Y', '4', '1', 'P');
break;
case VIDEO_PALETTE_YUV422P:
fourcc = GST_MAKE_FOURCC ('Y', '4', '2', 'B');
break;
case VIDEO_PALETTE_YUV410P:
fourcc = GST_MAKE_FOURCC ('Y', 'U', 'V', '9');
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', ' ')) {
switch (palette) {
case VIDEO_PALETTE_RGB555:
caps = gst_caps_from_string ("video/x-raw-rgb, "
"bpp = (int) 16, "
"depth = (int) 15, "
"endianness = (int) BYTE_ORDER, "
"red_mask = 0x7c00, " "green_mask = 0x03e0, " "blue_mask = 0x001f");
break;
case VIDEO_PALETTE_RGB565:
caps = gst_caps_from_string ("video/x-raw-rgb, "
"bpp = (int) 16, "
"depth = (int) 16, "
"endianness = (int) BYTE_ORDER, "
"red_mask = 0xf800, " "green_mask = 0x07f0, " "blue_mask = 0x001f");
break;
case VIDEO_PALETTE_RGB24:
caps = gst_caps_from_string ("video/x-raw-rgb, "
"bpp = (int) 24, "
"depth = (int) 24, "
"endianness = (int) BIG_ENDIAN, "
"red_mask = 0xFF0000, "
"green_mask = 0x00FF00, " "blue_mask = 0x0000FF");
break;
case VIDEO_PALETTE_RGB32:
caps = gst_caps_from_string ("video/x-raw-rgb, "
"bpp = (int) 24, "
"depth = (int) 32, "
"endianness = (int) BIG_ENDIAN, "
"red_mask = 0xFF000000, "
"green_mask = 0x00FF0000, " "blue_mask = 0x0000FF00");
break;
default:
g_assert_not_reached ();
return NULL;
}
} else {
caps = gst_caps_new_simple ("video/x-raw-yuv",
"format", GST_TYPE_FOURCC, fourcc, NULL);
}
return caps;
}
static GstPadLinkReturn
gst_v4lsrc_srcconnect (GstPad * pad, const GstCaps * vscapslist)
{
GstV4lSrc *v4lsrc;
guint32 fourcc;
gint bpp, depth, w, h, palette = -1;
gdouble fps;
GstStructure *structure;
gboolean was_capturing;
v4lsrc = GST_V4LSRC (gst_pad_get_parent (pad));
was_capturing = v4lsrc->is_capturing;
/* 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 (was_capturing) {
if (!gst_v4lsrc_capture_stop (v4lsrc))
return GST_PAD_LINK_REFUSED;
}
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;
}
structure = gst_caps_get_structure (vscapslist, 0);
if (!strcmp (gst_structure_get_name (structure), "video/x-raw-yuv"))
gst_structure_get_fourcc (structure, "format", &fourcc);
else
fourcc = GST_MAKE_FOURCC ('R', 'G', 'B', ' ');
gst_structure_get_int (structure, "width", &w);
gst_structure_get_int (structure, "height", &h);
gst_structure_get_double (structure, "framerate", &fps);
switch (fourcc) {
case GST_MAKE_FOURCC ('I', '4', '2', '0'):
palette = VIDEO_PALETTE_YUV420P;
v4lsrc->buffer_size = ((w + 1) & ~1) * ((h + 1) & ~1) * 1.5;
break;
case GST_MAKE_FOURCC ('Y', 'U', 'Y', '2'):
palette = VIDEO_PALETTE_YUV422;
v4lsrc->buffer_size = ((w + 1) & ~1) * h * 2;
break;
case GST_MAKE_FOURCC ('U', 'Y', 'V', 'Y'):
palette = VIDEO_PALETTE_UYVY;
v4lsrc->buffer_size = ((w + 1) & ~1) * h * 2;
break;
case GST_MAKE_FOURCC ('Y', '4', '1', 'B'):
palette = VIDEO_PALETTE_YUV411P;
v4lsrc->buffer_size = ((w + 3) & ~3) * h * 1.5;
break;
case GST_MAKE_FOURCC ('Y', '4', '1', 'P'):
palette = VIDEO_PALETTE_YUV411;
v4lsrc->buffer_size = ((w + 3) & ~3) * h * 1.5;
break;
case GST_MAKE_FOURCC ('Y', 'U', 'V', '9'):
palette = VIDEO_PALETTE_YUV410P;
v4lsrc->buffer_size = ((w + 3) & ~3) * ((h + 3) & ~3) * 1.125;
break;
case GST_MAKE_FOURCC ('Y', '4', '2', 'B'):
palette = VIDEO_PALETTE_YUV422P;
v4lsrc->buffer_size = ((w + 1) & ~1) * h * 2;
break;
case GST_MAKE_FOURCC ('R', 'G', 'B', ' '):
gst_structure_get_int (structure, "depth", &depth);
switch (depth) {
case 15:
palette = VIDEO_PALETTE_RGB555;
v4lsrc->buffer_size = w * h * 2;
break;
case 16:
palette = VIDEO_PALETTE_RGB565;
v4lsrc->buffer_size = w * h * 2;
break;
case 24:
gst_structure_get_int (structure, "bpp", &bpp);
switch (bpp) {
case 24:
palette = VIDEO_PALETTE_RGB24;
v4lsrc->buffer_size = w * h * 3;
break;
case 32:
palette = VIDEO_PALETTE_RGB32;
v4lsrc->buffer_size = w * h * 4;
break;
default:
break;
}
break;
default:
break;
}
break;
default:
break;
}
if (palette == -1)
return GST_PAD_LINK_REFUSED;
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;
if (was_capturing) {
if (!gst_v4lsrc_capture_start (v4lsrc))
return GST_PAD_LINK_REFUSED;
}
return GST_PAD_LINK_OK;
}
static GstCaps *
gst_v4lsrc_fixate (GstPad * pad, const GstCaps * caps)
{
GstStructure *structure;
GstCaps *newcaps;
GstV4lSrc *v4lsrc = GST_V4LSRC (gst_pad_get_parent (pad));
struct video_capability *vcap = &GST_V4LELEMENT (v4lsrc)->vcap;
if (gst_caps_get_size (caps) > 1)
return NULL;
if (!vcap) {
GST_DEBUG_OBJECT (v4lsrc, "don't have device caps, cannot fixate");
return NULL;
}
newcaps = gst_caps_copy (caps);
structure = gst_caps_get_structure (newcaps, 0);
GST_DEBUG_OBJECT (v4lsrc, "device reported w: %d-%d, h: %d-%d",
vcap->minwidth, vcap->maxwidth, vcap->minheight, vcap->maxheight);
if (gst_caps_structure_fixate_field_nearest_int (structure, "width",
vcap->maxwidth)) {
return newcaps;
}
if (gst_caps_structure_fixate_field_nearest_int (structure, "height",
vcap->maxheight)) {
return newcaps;
}
gst_caps_free (newcaps);
return NULL;
}
static GstCaps *
gst_v4lsrc_getcaps (GstPad * pad)
{
GstCaps *list;
GstV4lSrc *v4lsrc = GST_V4LSRC (gst_pad_get_parent (pad));
struct video_capability *vcap = &GST_V4LELEMENT (v4lsrc)->vcap;
gfloat fps;
GList *item;
if (!GST_V4L_IS_OPEN (GST_V4LELEMENT (v4lsrc))) {
return gst_caps_new_any ();
}
fps = gst_v4lsrc_get_fps (v4lsrc);
list = gst_caps_new_empty ();
for (item = v4lsrc->colourspaces; item != NULL; item = item->next) {
GstCaps *one;
one = gst_v4lsrc_palette_to_caps (GPOINTER_TO_INT (item->data));
if (!one)
g_print ("Palette %d gave no caps\n", GPOINTER_TO_INT (item->data));
GST_DEBUG_OBJECT (v4lsrc,
"Device reports w: %d-%d, h: %d-%d, fps: %f for palette %d",
vcap->minwidth, vcap->maxwidth, vcap->minheight, vcap->maxheight, fps,
GPOINTER_TO_INT (item->data));
gst_caps_set_simple (one, "width", GST_TYPE_INT_RANGE, vcap->minwidth,
vcap->maxwidth, "height", GST_TYPE_INT_RANGE, vcap->minheight,
vcap->maxheight, "framerate", G_TYPE_DOUBLE, fps, NULL);
gst_caps_append (list, one);
}
return list;
}
static GstData *
gst_v4lsrc_get (GstPad * pad)
{
GstV4lSrc *v4lsrc;
GstBuffer *buf;
gint num;
gdouble fps = 0.;
v4lsrc_private_t *v4lsrc_private = NULL;
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;
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_sync - 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 * (GST_SECOND / fps) - time >
1.5 * (GST_SECOND / fps)) {
/* 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 * (GST_SECOND / fps) - time <
-1.5 * (GST_SECOND / fps)) {
/* 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;
}
buf = gst_buffer_new ();
GST_BUFFER_FREE_DATA_FUNC (buf) = gst_v4lsrc_buffer_free;
/* to requeue buffers, we need a ref to the element, as well as the frame
number we got this buffer from */
v4lsrc_private = g_malloc (sizeof (v4lsrc_private_t));
v4lsrc_private->v4lsrc = v4lsrc;
v4lsrc_private->num = num;
GST_BUFFER_PRIVATE (buf) = v4lsrc_private;
GST_BUFFER_FLAG_SET (buf, GST_BUFFER_READONLY | GST_BUFFER_DONTFREE);
GST_BUFFER_DATA (buf) = gst_v4lsrc_get_buffer (v4lsrc, num);
GST_BUFFER_MAXSIZE (buf) = v4lsrc->mbuf.size / v4lsrc->mbuf.frames;
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_sync - v4lsrc->substract_time;
v4lsrc->handled++;
g_signal_emit (G_OBJECT (v4lsrc),
gst_v4lsrc_signals[SIGNAL_FRAME_CAPTURE], 0);
return GST_DATA (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;
}
#if 0
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;
}
#endif
static void
gst_v4lsrc_buffer_free (GstBuffer * buf)
{
v4lsrc_private_t *v4lsrc_private;
GstV4lSrc *v4lsrc;
int num;
v4lsrc_private = GST_BUFFER_PRIVATE (buf);
g_assert (v4lsrc_private);
v4lsrc = v4lsrc_private->v4lsrc;
num = v4lsrc_private->num;
g_free (v4lsrc_private);
GST_BUFFER_PRIVATE (buf) = 0;
GST_LOG_OBJECT (v4lsrc, "freeing buffer %p with refcount %d for frame %d",
buf, GST_BUFFER_REFCOUNT_VALUE (buf), num);
if (gst_element_get_state (GST_ELEMENT (v4lsrc)) != GST_STATE_PLAYING)
return; /* we've already cleaned up ourselves */
v4lsrc->use_num_times[num]--;
if (v4lsrc->use_num_times[num] <= 0) {
GST_LOG_OBJECT (v4lsrc, "requeueing frame %d", num);
gst_v4lsrc_requeue_frame (v4lsrc, num);
}
}
static void
gst_v4lsrc_set_clock (GstElement * element, GstClock * clock)
{
GST_V4LSRC (element)->clock = clock;
}
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