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gstreamer/subprojects/gst-plugins-good/sys/v4l2/gstv4l2transform.c
Pawel Stawicki 94ba019397 v4l2: Fix SIGSEGV on 'change state' during 'format change' 
Ensure all access to v4l2object->pool imply taking a lock and a hard ref on the pool

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/3481>
2022-12-01 12:47:54 +00:00

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/*
* Copyright (C) 2014 Collabora Ltd.
* Author: Nicolas Dufresne <nicolas.dufresne@collabora.co.uk>
*
* 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., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <unistd.h>
#include <string.h>
#include "gstv4l2object.h"
#include "gstv4l2transform.h"
#include <string.h>
#include <glib/gi18n-lib.h>
#define DEFAULT_PROP_DEVICE "/dev/video10"
#define V4L2_TRANSFORM_QUARK \
g_quark_from_static_string("gst-v4l2-transform-info")
GST_DEBUG_CATEGORY_STATIC (gst_v4l2_transform_debug);
#define GST_CAT_DEFAULT gst_v4l2_transform_debug
enum
{
PROP_0,
V4L2_STD_OBJECT_PROPS,
PROP_DISABLE_PASSTHROUGH
};
typedef struct
{
gchar *device;
GstCaps *sink_caps;
GstCaps *src_caps;
} GstV4l2TransformCData;
#define gst_v4l2_transform_parent_class parent_class
G_DEFINE_ABSTRACT_TYPE (GstV4l2Transform, gst_v4l2_transform,
GST_TYPE_BASE_TRANSFORM);
static void
gst_v4l2_transform_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec)
{
GstV4l2Transform *self = GST_V4L2_TRANSFORM (object);
switch (prop_id) {
case PROP_CAPTURE_IO_MODE:
gst_v4l2_object_set_property_helper (self->v4l2capture, prop_id, value,
pspec);
break;
case PROP_DISABLE_PASSTHROUGH:
self->disable_passthrough = g_value_get_boolean (value);
break;
/* By default, only set on output */
default:
if (!gst_v4l2_object_set_property_helper (self->v4l2output,
prop_id, value, pspec)) {
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
}
break;
}
}
static void
gst_v4l2_transform_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec)
{
GstV4l2Transform *self = GST_V4L2_TRANSFORM (object);
switch (prop_id) {
case PROP_CAPTURE_IO_MODE:
gst_v4l2_object_get_property_helper (self->v4l2capture, prop_id, value,
pspec);
break;
case PROP_DISABLE_PASSTHROUGH:
g_value_set_boolean (value, self->disable_passthrough);
break;
/* By default read from output */
default:
if (!gst_v4l2_object_get_property_helper (self->v4l2output,
prop_id, value, pspec)) {
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
}
break;
}
}
static gboolean
gst_v4l2_transform_open (GstV4l2Transform * self)
{
GstV4l2Error error = GST_V4L2_ERROR_INIT;
GST_DEBUG_OBJECT (self, "Opening");
if (!gst_v4l2_object_open (self->v4l2output, &error))
goto failure;
if (!gst_v4l2_object_open_shared (self->v4l2capture, self->v4l2output))
goto failure;
self->probed_sinkcaps = gst_v4l2_object_get_caps (self->v4l2output,
gst_v4l2_object_get_raw_caps ());
if (gst_caps_is_empty (self->probed_sinkcaps))
goto no_input_format;
self->probed_srccaps = gst_v4l2_object_get_caps (self->v4l2capture,
gst_v4l2_object_get_raw_caps ());
if (gst_caps_is_empty (self->probed_srccaps))
goto no_output_format;
return TRUE;
no_input_format:
GST_ELEMENT_ERROR (self, RESOURCE, SETTINGS,
(_("Converter on device %s has no supported input format"),
self->v4l2output->videodev), (NULL));
goto failure;
no_output_format:
GST_ELEMENT_ERROR (self, RESOURCE, SETTINGS,
(_("Converter on device %s has no supported output format"),
self->v4l2output->videodev), (NULL));
goto failure;
failure:
if (GST_V4L2_IS_OPEN (self->v4l2output))
gst_v4l2_object_close (self->v4l2output);
if (GST_V4L2_IS_OPEN (self->v4l2capture))
gst_v4l2_object_close (self->v4l2capture);
gst_caps_replace (&self->probed_srccaps, NULL);
gst_caps_replace (&self->probed_sinkcaps, NULL);
gst_v4l2_error (self, &error);
return FALSE;
}
static void
gst_v4l2_transform_close (GstV4l2Transform * self)
{
GST_DEBUG_OBJECT (self, "Closing");
gst_v4l2_object_close (self->v4l2output);
gst_v4l2_object_close (self->v4l2capture);
gst_caps_replace (&self->probed_srccaps, NULL);
gst_caps_replace (&self->probed_sinkcaps, NULL);
}
static gboolean
gst_v4l2_transform_stop (GstBaseTransform * trans)
{
GstV4l2Transform *self = GST_V4L2_TRANSFORM (trans);
GST_DEBUG_OBJECT (self, "Stop");
gst_v4l2_object_stop (self->v4l2output);
gst_v4l2_object_stop (self->v4l2capture);
gst_caps_replace (&self->incaps, NULL);
gst_caps_replace (&self->outcaps, NULL);
return TRUE;
}
static gboolean
gst_v4l2_transform_set_caps (GstBaseTransform * trans, GstCaps * incaps,
GstCaps * outcaps)
{
GstV4l2Error error = GST_V4L2_ERROR_INIT;
GstV4l2Transform *self = GST_V4L2_TRANSFORM (trans);
if (self->disable_passthrough)
gst_base_transform_set_passthrough (trans, FALSE);
if (self->incaps && self->outcaps) {
if (gst_caps_is_equal (incaps, self->incaps) &&
gst_caps_is_equal (outcaps, self->outcaps)) {
GST_DEBUG_OBJECT (trans, "Caps did not changed");
return TRUE;
}
}
gst_v4l2_object_stop (self->v4l2output);
gst_v4l2_object_stop (self->v4l2capture);
if (!gst_v4l2_object_set_format (self->v4l2output, incaps, &error))
goto incaps_failed;
if (!gst_v4l2_object_set_format (self->v4l2capture, outcaps, &error))
goto outcaps_failed;
gst_caps_replace (&self->incaps, incaps);
gst_caps_replace (&self->outcaps, outcaps);
/* FIXME implement fallback if crop not supported */
if (!gst_v4l2_object_setup_padding (self->v4l2output))
goto failed;
if (!gst_v4l2_object_setup_padding (self->v4l2capture))
goto failed;
return TRUE;
incaps_failed:
{
GST_ERROR_OBJECT (self, "failed to set input caps: %" GST_PTR_FORMAT,
incaps);
gst_v4l2_error (self, &error);
goto failed;
}
outcaps_failed:
{
gst_v4l2_object_stop (self->v4l2output);
GST_ERROR_OBJECT (self, "failed to set output caps: %" GST_PTR_FORMAT,
outcaps);
gst_v4l2_error (self, &error);
goto failed;
}
failed:
return FALSE;
}
static gboolean
gst_v4l2_transform_query (GstBaseTransform * trans, GstPadDirection direction,
GstQuery * query)
{
GstV4l2Transform *self = GST_V4L2_TRANSFORM (trans);
gboolean ret = TRUE;
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_CAPS:{
GstCaps *filter, *caps = NULL, *result = NULL;
GstPad *pad, *otherpad;
gst_query_parse_caps (query, &filter);
if (direction == GST_PAD_SRC) {
pad = GST_BASE_TRANSFORM_SRC_PAD (trans);
otherpad = GST_BASE_TRANSFORM_SINK_PAD (trans);
if (self->probed_srccaps)
caps = gst_caps_ref (self->probed_srccaps);
} else {
pad = GST_BASE_TRANSFORM_SINK_PAD (trans);
otherpad = GST_BASE_TRANSFORM_SRC_PAD (trans);
if (self->probed_sinkcaps)
caps = gst_caps_ref (self->probed_sinkcaps);
}
if (!caps)
caps = gst_pad_get_pad_template_caps (pad);
if (filter) {
GstCaps *tmp = caps;
caps = gst_caps_intersect_full (filter, tmp, GST_CAPS_INTERSECT_FIRST);
gst_caps_unref (tmp);
}
result = gst_pad_peer_query_caps (otherpad, caps);
result = gst_caps_make_writable (result);
gst_caps_append (result, caps);
GST_DEBUG_OBJECT (self, "Returning %s caps %" GST_PTR_FORMAT,
GST_PAD_NAME (pad), result);
gst_query_set_caps_result (query, result);
gst_caps_unref (result);
break;
}
default:
ret = GST_BASE_TRANSFORM_CLASS (parent_class)->query (trans, direction,
query);
break;
}
return ret;
}
static gboolean
gst_v4l2_transform_decide_allocation (GstBaseTransform * trans,
GstQuery * query)
{
GstV4l2Transform *self = GST_V4L2_TRANSFORM (trans);
gboolean ret = FALSE;
GST_DEBUG_OBJECT (self, "called");
if (gst_v4l2_object_decide_allocation (self->v4l2capture, query)) {
gboolean pool_active;
GstBufferPool *pool = gst_v4l2_object_get_buffer_pool (self->v4l2capture);
ret = GST_BASE_TRANSFORM_CLASS (parent_class)->decide_allocation (trans,
query);
pool_active = gst_buffer_pool_set_active (pool, TRUE);
if (pool)
gst_object_unref (pool);
if (!pool_active)
goto activate_failed;
}
return ret;
activate_failed:
GST_ELEMENT_ERROR (self, RESOURCE, SETTINGS,
("failed to activate bufferpool"), ("failed to activate bufferpool"));
return TRUE;
}
static gboolean
gst_v4l2_transform_propose_allocation (GstBaseTransform * trans,
GstQuery * decide_query, GstQuery * query)
{
GstV4l2Transform *self = GST_V4L2_TRANSFORM (trans);
gboolean ret = FALSE;
GST_DEBUG_OBJECT (self, "called");
if (decide_query == NULL)
ret = TRUE;
else
ret = gst_v4l2_object_propose_allocation (self->v4l2output, query);
if (ret)
ret = GST_BASE_TRANSFORM_CLASS (parent_class)->propose_allocation (trans,
decide_query, query);
return ret;
}
/* copies the given caps */
static GstCaps *
gst_v4l2_transform_caps_remove_format_info (GstCaps * caps)
{
GstStructure *st;
GstCapsFeatures *f;
gint i, n;
GstCaps *res;
res = gst_caps_new_empty ();
n = gst_caps_get_size (caps);
for (i = 0; i < n; i++) {
st = gst_caps_get_structure (caps, i);
f = gst_caps_get_features (caps, i);
/* If this is already expressed by the existing caps
* skip this structure */
if (i > 0 && gst_caps_is_subset_structure_full (res, st, f))
continue;
st = gst_structure_copy (st);
/* Only remove format info for the cases when we can actually convert */
if (!gst_caps_features_is_any (f)
&& gst_caps_features_is_equal (f,
GST_CAPS_FEATURES_MEMORY_SYSTEM_MEMORY))
gst_structure_remove_fields (st, "format", "colorimetry", "chroma-site",
"width", "height", "pixel-aspect-ratio", NULL);
gst_caps_append_structure_full (res, st, gst_caps_features_copy (f));
}
return res;
}
/* The caps can be transformed into any other caps with format info removed.
* However, we should prefer passthrough, so if passthrough is possible,
* put it first in the list. */
static GstCaps *
gst_v4l2_transform_transform_caps (GstBaseTransform * btrans,
GstPadDirection direction, GstCaps * caps, GstCaps * filter)
{
GstCaps *tmp, *tmp2;
GstCaps *result;
/* Get all possible caps that we can transform to */
tmp = gst_v4l2_transform_caps_remove_format_info (caps);
if (filter) {
tmp2 = gst_caps_intersect_full (filter, tmp, GST_CAPS_INTERSECT_FIRST);
gst_caps_unref (tmp);
tmp = tmp2;
}
result = tmp;
GST_DEBUG_OBJECT (btrans, "transformed %" GST_PTR_FORMAT " into %"
GST_PTR_FORMAT, caps, result);
return result;
}
static GstCaps *
gst_v4l2_transform_fixate_caps (GstBaseTransform * trans,
GstPadDirection direction, GstCaps * caps, GstCaps * othercaps)
{
GstStructure *ins, *outs;
const GValue *from_par, *to_par;
GValue fpar = { 0, }, tpar = {
0,};
othercaps = gst_caps_truncate (othercaps);
othercaps = gst_caps_make_writable (othercaps);
GST_DEBUG_OBJECT (trans, "trying to fixate othercaps %" GST_PTR_FORMAT
" based on caps %" GST_PTR_FORMAT, othercaps, caps);
ins = gst_caps_get_structure (caps, 0);
outs = gst_caps_get_structure (othercaps, 0);
{
const gchar *in_format;
in_format = gst_structure_get_string (ins, "format");
if (in_format) {
/* Try to set output format for pass through */
gst_structure_fixate_field_string (outs, "format", in_format);
}
}
from_par = gst_structure_get_value (ins, "pixel-aspect-ratio");
to_par = gst_structure_get_value (outs, "pixel-aspect-ratio");
/* If we're fixating from the sinkpad we always set the PAR and
* assume that missing PAR on the sinkpad means 1/1 and
* missing PAR on the srcpad means undefined
*/
if (direction == GST_PAD_SINK) {
if (!from_par) {
g_value_init (&fpar, GST_TYPE_FRACTION);
gst_value_set_fraction (&fpar, 1, 1);
from_par = &fpar;
}
if (!to_par) {
g_value_init (&tpar, GST_TYPE_FRACTION_RANGE);
gst_value_set_fraction_range_full (&tpar, 1, G_MAXINT, G_MAXINT, 1);
to_par = &tpar;
}
} else {
if (!to_par) {
g_value_init (&tpar, GST_TYPE_FRACTION);
gst_value_set_fraction (&tpar, 1, 1);
to_par = &tpar;
gst_structure_set (outs, "pixel-aspect-ratio", GST_TYPE_FRACTION, 1, 1,
NULL);
}
if (!from_par) {
g_value_init (&fpar, GST_TYPE_FRACTION);
gst_value_set_fraction (&fpar, 1, 1);
from_par = &fpar;
}
}
/* we have both PAR but they might not be fixated */
{
gint from_w, from_h, from_par_n, from_par_d, to_par_n, to_par_d;
gint w = 0, h = 0;
gint from_dar_n, from_dar_d;
gint num, den;
/* from_par should be fixed */
g_return_val_if_fail (gst_value_is_fixed (from_par), othercaps);
from_par_n = gst_value_get_fraction_numerator (from_par);
from_par_d = gst_value_get_fraction_denominator (from_par);
gst_structure_get_int (ins, "width", &from_w);
gst_structure_get_int (ins, "height", &from_h);
gst_structure_get_int (outs, "width", &w);
gst_structure_get_int (outs, "height", &h);
/* if both width and height are already fixed, we can't do anything
* about it anymore */
if (w && h) {
guint n, d;
GST_DEBUG_OBJECT (trans, "dimensions already set to %dx%d, not fixating",
w, h);
if (!gst_value_is_fixed (to_par)) {
if (gst_video_calculate_display_ratio (&n, &d, from_w, from_h,
from_par_n, from_par_d, w, h)) {
GST_DEBUG_OBJECT (trans, "fixating to_par to %dx%d", n, d);
if (gst_structure_has_field (outs, "pixel-aspect-ratio"))
gst_structure_fixate_field_nearest_fraction (outs,
"pixel-aspect-ratio", n, d);
else if (n != d)
gst_structure_set (outs, "pixel-aspect-ratio", GST_TYPE_FRACTION,
n, d, NULL);
}
}
goto done;
}
/* Calculate input DAR */
if (!gst_util_fraction_multiply (from_w, from_h, from_par_n, from_par_d,
&from_dar_n, &from_dar_d)) {
GST_ELEMENT_ERROR (trans, CORE, NEGOTIATION, (NULL),
("Error calculating the output scaled size - integer overflow"));
goto done;
}
GST_DEBUG_OBJECT (trans, "Input DAR is %d/%d", from_dar_n, from_dar_d);
/* If either width or height are fixed there's not much we
* can do either except choosing a height or width and PAR
* that matches the DAR as good as possible
*/
if (h) {
GstStructure *tmp;
gint set_w, set_par_n, set_par_d;
GST_DEBUG_OBJECT (trans, "height is fixed (%d)", h);
/* If the PAR is fixed too, there's not much to do
* except choosing the width that is nearest to the
* width with the same DAR */
if (gst_value_is_fixed (to_par)) {
to_par_n = gst_value_get_fraction_numerator (to_par);
to_par_d = gst_value_get_fraction_denominator (to_par);
GST_DEBUG_OBJECT (trans, "PAR is fixed %d/%d", to_par_n, to_par_d);
if (!gst_util_fraction_multiply (from_dar_n, from_dar_d, to_par_d,
to_par_n, &num, &den)) {
GST_ELEMENT_ERROR (trans, CORE, NEGOTIATION, (NULL),
("Error calculating the output scaled size - integer overflow"));
goto done;
}
w = (guint) gst_util_uint64_scale_int (h, num, den);
gst_structure_fixate_field_nearest_int (outs, "width", w);
goto done;
}
/* The PAR is not fixed and it's quite likely that we can set
* an arbitrary PAR. */
/* Check if we can keep the input width */
tmp = gst_structure_copy (outs);
gst_structure_fixate_field_nearest_int (tmp, "width", from_w);
gst_structure_get_int (tmp, "width", &set_w);
/* Might have failed but try to keep the DAR nonetheless by
* adjusting the PAR */
if (!gst_util_fraction_multiply (from_dar_n, from_dar_d, h, set_w,
&to_par_n, &to_par_d)) {
GST_ELEMENT_ERROR (trans, CORE, NEGOTIATION, (NULL),
("Error calculating the output scaled size - integer overflow"));
gst_structure_free (tmp);
goto done;
}
if (!gst_structure_has_field (tmp, "pixel-aspect-ratio"))
gst_structure_set_value (tmp, "pixel-aspect-ratio", to_par);
gst_structure_fixate_field_nearest_fraction (tmp, "pixel-aspect-ratio",
to_par_n, to_par_d);
gst_structure_get_fraction (tmp, "pixel-aspect-ratio", &set_par_n,
&set_par_d);
gst_structure_free (tmp);
/* Check if the adjusted PAR is accepted */
if (set_par_n == to_par_n && set_par_d == to_par_d) {
if (gst_structure_has_field (outs, "pixel-aspect-ratio") ||
set_par_n != set_par_d)
gst_structure_set (outs, "width", G_TYPE_INT, set_w,
"pixel-aspect-ratio", GST_TYPE_FRACTION, set_par_n, set_par_d,
NULL);
goto done;
}
/* Otherwise scale the width to the new PAR and check if the
* adjusted with is accepted. If all that fails we can't keep
* the DAR */
if (!gst_util_fraction_multiply (from_dar_n, from_dar_d, set_par_d,
set_par_n, &num, &den)) {
GST_ELEMENT_ERROR (trans, CORE, NEGOTIATION, (NULL),
("Error calculating the output scaled size - integer overflow"));
goto done;
}
w = (guint) gst_util_uint64_scale_int (h, num, den);
gst_structure_fixate_field_nearest_int (outs, "width", w);
if (gst_structure_has_field (outs, "pixel-aspect-ratio") ||
set_par_n != set_par_d)
gst_structure_set (outs, "pixel-aspect-ratio", GST_TYPE_FRACTION,
set_par_n, set_par_d, NULL);
goto done;
} else if (w) {
GstStructure *tmp;
gint set_h, set_par_n, set_par_d;
GST_DEBUG_OBJECT (trans, "width is fixed (%d)", w);
/* If the PAR is fixed too, there's not much to do
* except choosing the height that is nearest to the
* height with the same DAR */
if (gst_value_is_fixed (to_par)) {
to_par_n = gst_value_get_fraction_numerator (to_par);
to_par_d = gst_value_get_fraction_denominator (to_par);
GST_DEBUG_OBJECT (trans, "PAR is fixed %d/%d", to_par_n, to_par_d);
if (!gst_util_fraction_multiply (from_dar_n, from_dar_d, to_par_d,
to_par_n, &num, &den)) {
GST_ELEMENT_ERROR (trans, CORE, NEGOTIATION, (NULL),
("Error calculating the output scaled size - integer overflow"));
goto done;
}
h = (guint) gst_util_uint64_scale_int (w, den, num);
gst_structure_fixate_field_nearest_int (outs, "height", h);
goto done;
}
/* The PAR is not fixed and it's quite likely that we can set
* an arbitrary PAR. */
/* Check if we can keep the input height */
tmp = gst_structure_copy (outs);
gst_structure_fixate_field_nearest_int (tmp, "height", from_h);
gst_structure_get_int (tmp, "height", &set_h);
/* Might have failed but try to keep the DAR nonetheless by
* adjusting the PAR */
if (!gst_util_fraction_multiply (from_dar_n, from_dar_d, set_h, w,
&to_par_n, &to_par_d)) {
GST_ELEMENT_ERROR (trans, CORE, NEGOTIATION, (NULL),
("Error calculating the output scaled size - integer overflow"));
gst_structure_free (tmp);
goto done;
}
if (!gst_structure_has_field (tmp, "pixel-aspect-ratio"))
gst_structure_set_value (tmp, "pixel-aspect-ratio", to_par);
gst_structure_fixate_field_nearest_fraction (tmp, "pixel-aspect-ratio",
to_par_n, to_par_d);
gst_structure_get_fraction (tmp, "pixel-aspect-ratio", &set_par_n,
&set_par_d);
gst_structure_free (tmp);
/* Check if the adjusted PAR is accepted */
if (set_par_n == to_par_n && set_par_d == to_par_d) {
if (gst_structure_has_field (outs, "pixel-aspect-ratio") ||
set_par_n != set_par_d)
gst_structure_set (outs, "height", G_TYPE_INT, set_h,
"pixel-aspect-ratio", GST_TYPE_FRACTION, set_par_n, set_par_d,
NULL);
goto done;
}
/* Otherwise scale the height to the new PAR and check if the
* adjusted with is accepted. If all that fails we can't keep
* the DAR */
if (!gst_util_fraction_multiply (from_dar_n, from_dar_d, set_par_d,
set_par_n, &num, &den)) {
GST_ELEMENT_ERROR (trans, CORE, NEGOTIATION, (NULL),
("Error calculating the output scaled size - integer overflow"));
goto done;
}
h = (guint) gst_util_uint64_scale_int (w, den, num);
gst_structure_fixate_field_nearest_int (outs, "height", h);
if (gst_structure_has_field (outs, "pixel-aspect-ratio") ||
set_par_n != set_par_d)
gst_structure_set (outs, "pixel-aspect-ratio", GST_TYPE_FRACTION,
set_par_n, set_par_d, NULL);
goto done;
} else if (gst_value_is_fixed (to_par)) {
GstStructure *tmp;
gint set_h, set_w, f_h, f_w;
to_par_n = gst_value_get_fraction_numerator (to_par);
to_par_d = gst_value_get_fraction_denominator (to_par);
GST_DEBUG_OBJECT (trans, "PAR is fixed %d/%d", to_par_n, to_par_d);
/* Calculate scale factor for the PAR change */
if (!gst_util_fraction_multiply (from_dar_n, from_dar_d, to_par_d,
to_par_n, &num, &den)) {
GST_ELEMENT_ERROR (trans, CORE, NEGOTIATION, (NULL),
("Error calculating the output scaled size - integer overflow"));
goto done;
}
/* Try to keep the input height (because of interlacing) */
tmp = gst_structure_copy (outs);
gst_structure_fixate_field_nearest_int (tmp, "height", from_h);
gst_structure_get_int (tmp, "height", &set_h);
/* This might have failed but try to scale the width
* to keep the DAR nonetheless */
w = (guint) gst_util_uint64_scale_int (set_h, num, den);
gst_structure_fixate_field_nearest_int (tmp, "width", w);
gst_structure_get_int (tmp, "width", &set_w);
gst_structure_free (tmp);
/* We kept the DAR and the height is nearest to the original height */
if (set_w == w) {
gst_structure_set (outs, "width", G_TYPE_INT, set_w, "height",
G_TYPE_INT, set_h, NULL);
goto done;
}
f_h = set_h;
f_w = set_w;
/* If the former failed, try to keep the input width at least */
tmp = gst_structure_copy (outs);
gst_structure_fixate_field_nearest_int (tmp, "width", from_w);
gst_structure_get_int (tmp, "width", &set_w);
/* This might have failed but try to scale the width
* to keep the DAR nonetheless */
h = (guint) gst_util_uint64_scale_int (set_w, den, num);
gst_structure_fixate_field_nearest_int (tmp, "height", h);
gst_structure_get_int (tmp, "height", &set_h);
gst_structure_free (tmp);
/* We kept the DAR and the width is nearest to the original width */
if (set_h == h) {
gst_structure_set (outs, "width", G_TYPE_INT, set_w, "height",
G_TYPE_INT, set_h, NULL);
goto done;
}
/* If all this failed, keep the height that was nearest to the original
* height and the nearest possible width. This changes the DAR but
* there's not much else to do here.
*/
gst_structure_set (outs, "width", G_TYPE_INT, f_w, "height", G_TYPE_INT,
f_h, NULL);
goto done;
} else {
GstStructure *tmp;
gint set_h, set_w, set_par_n, set_par_d, tmp2;
/* width, height and PAR are not fixed but passthrough is not possible */
/* First try to keep the height and width as good as possible
* and scale PAR */
tmp = gst_structure_copy (outs);
gst_structure_fixate_field_nearest_int (tmp, "height", from_h);
gst_structure_get_int (tmp, "height", &set_h);
gst_structure_fixate_field_nearest_int (tmp, "width", from_w);
gst_structure_get_int (tmp, "width", &set_w);
if (!gst_util_fraction_multiply (from_dar_n, from_dar_d, set_h, set_w,
&to_par_n, &to_par_d)) {
GST_ELEMENT_ERROR (trans, CORE, NEGOTIATION, (NULL),
("Error calculating the output scaled size - integer overflow"));
gst_structure_free (tmp);
goto done;
}
if (!gst_structure_has_field (tmp, "pixel-aspect-ratio"))
gst_structure_set_value (tmp, "pixel-aspect-ratio", to_par);
gst_structure_fixate_field_nearest_fraction (tmp, "pixel-aspect-ratio",
to_par_n, to_par_d);
gst_structure_get_fraction (tmp, "pixel-aspect-ratio", &set_par_n,
&set_par_d);
gst_structure_free (tmp);
if (set_par_n == to_par_n && set_par_d == to_par_d) {
gst_structure_set (outs, "width", G_TYPE_INT, set_w, "height",
G_TYPE_INT, set_h, NULL);
if (gst_structure_has_field (outs, "pixel-aspect-ratio") ||
set_par_n != set_par_d)
gst_structure_set (outs, "pixel-aspect-ratio", GST_TYPE_FRACTION,
set_par_n, set_par_d, NULL);
goto done;
}
/* Otherwise try to scale width to keep the DAR with the set
* PAR and height */
if (!gst_util_fraction_multiply (from_dar_n, from_dar_d, set_par_d,
set_par_n, &num, &den)) {
GST_ELEMENT_ERROR (trans, CORE, NEGOTIATION, (NULL),
("Error calculating the output scaled size - integer overflow"));
goto done;
}
w = (guint) gst_util_uint64_scale_int (set_h, num, den);
tmp = gst_structure_copy (outs);
gst_structure_fixate_field_nearest_int (tmp, "width", w);
gst_structure_get_int (tmp, "width", &tmp2);
gst_structure_free (tmp);
if (tmp2 == w) {
gst_structure_set (outs, "width", G_TYPE_INT, tmp2, "height",
G_TYPE_INT, set_h, NULL);
if (gst_structure_has_field (outs, "pixel-aspect-ratio") ||
set_par_n != set_par_d)
gst_structure_set (outs, "pixel-aspect-ratio", GST_TYPE_FRACTION,
set_par_n, set_par_d, NULL);
goto done;
}
/* ... or try the same with the height */
h = (guint) gst_util_uint64_scale_int (set_w, den, num);
tmp = gst_structure_copy (outs);
gst_structure_fixate_field_nearest_int (tmp, "height", h);
gst_structure_get_int (tmp, "height", &tmp2);
gst_structure_free (tmp);
if (tmp2 == h) {
gst_structure_set (outs, "width", G_TYPE_INT, set_w, "height",
G_TYPE_INT, tmp2, NULL);
if (gst_structure_has_field (outs, "pixel-aspect-ratio") ||
set_par_n != set_par_d)
gst_structure_set (outs, "pixel-aspect-ratio", GST_TYPE_FRACTION,
set_par_n, set_par_d, NULL);
goto done;
}
/* If all fails we can't keep the DAR and take the nearest values
* for everything from the first try */
gst_structure_set (outs, "width", G_TYPE_INT, set_w, "height",
G_TYPE_INT, set_h, NULL);
if (gst_structure_has_field (outs, "pixel-aspect-ratio") ||
set_par_n != set_par_d)
gst_structure_set (outs, "pixel-aspect-ratio", GST_TYPE_FRACTION,
set_par_n, set_par_d, NULL);
}
}
done:
GST_DEBUG_OBJECT (trans, "fixated othercaps to %" GST_PTR_FORMAT, othercaps);
if (from_par == &fpar)
g_value_unset (&fpar);
if (to_par == &tpar)
g_value_unset (&tpar);
/* fixate remaining fields */
othercaps = gst_caps_fixate (othercaps);
if (direction == GST_PAD_SINK) {
if (gst_caps_is_subset (caps, othercaps)) {
gst_caps_replace (&othercaps, caps);
}
}
return othercaps;
}
static GstFlowReturn
gst_v4l2_transform_prepare_output_buffer (GstBaseTransform * trans,
GstBuffer * inbuf, GstBuffer ** outbuf)
{
GstV4l2Transform *self = GST_V4L2_TRANSFORM (trans);
GstBufferPool *pool = gst_v4l2_object_get_buffer_pool (self->v4l2output);
GstFlowReturn ret = GST_FLOW_OK;
GstBaseTransformClass *bclass = GST_BASE_TRANSFORM_CLASS (parent_class);
if (gst_base_transform_is_passthrough (trans)) {
GST_DEBUG_OBJECT (self, "Passthrough, no need to do anything");
*outbuf = inbuf;
goto beach;
}
/* Ensure input internal pool is active */
if (!gst_buffer_pool_is_active (pool)) {
GstStructure *config = gst_buffer_pool_get_config (pool);
gint min = MAX (GST_V4L2_MIN_BUFFERS (self->v4l2output),
self->v4l2output->min_buffers);
if (self->v4l2output->mode == GST_V4L2_IO_USERPTR ||
self->v4l2output->mode == GST_V4L2_IO_DMABUF_IMPORT) {
if (!gst_v4l2_object_try_import (self->v4l2output, inbuf)) {
GST_ERROR_OBJECT (self, "cannot import buffers from upstream");
return GST_FLOW_ERROR;
}
if (self->v4l2output->need_video_meta) {
/* We may need video meta if imported buffer is using non-standard
* stride/padding */
gst_buffer_pool_config_add_option (config,
GST_BUFFER_POOL_OPTION_VIDEO_META);
}
}
gst_buffer_pool_config_set_params (config, self->incaps,
self->v4l2output->info.size, min, min);
/* There is no reason to refuse this config */
if (!gst_buffer_pool_set_config (pool, config))
goto activate_failed;
if (!gst_buffer_pool_set_active (pool, TRUE))
goto activate_failed;
}
GST_DEBUG_OBJECT (self, "Queue input buffer");
ret =
gst_v4l2_buffer_pool_process (GST_V4L2_BUFFER_POOL (pool), &inbuf, NULL);
if (G_UNLIKELY (ret != GST_FLOW_OK))
goto beach;
do {
if (pool)
g_object_unref (pool);
pool = gst_base_transform_get_buffer_pool (trans);
if (!gst_buffer_pool_set_active (pool, TRUE))
goto activate_failed;
GST_DEBUG_OBJECT (self, "Dequeue output buffer");
ret = gst_buffer_pool_acquire_buffer (pool, outbuf, NULL);
g_object_unref (pool);
if (ret != GST_FLOW_OK)
goto alloc_failed;
pool = gst_v4l2_object_get_buffer_pool (self->v4l2capture);
ret =
gst_v4l2_buffer_pool_process (GST_V4L2_BUFFER_POOL (pool), outbuf,
NULL);
} while (ret == GST_V4L2_FLOW_CORRUPTED_BUFFER);
if (ret != GST_FLOW_OK) {
gst_buffer_unref (*outbuf);
*outbuf = NULL;
}
if (bclass->copy_metadata)
if (!bclass->copy_metadata (trans, inbuf, *outbuf)) {
/* something failed, post a warning */
GST_ELEMENT_WARNING (self, STREAM, NOT_IMPLEMENTED,
("could not copy metadata"), (NULL));
}
beach:
if (pool)
g_object_unref (pool);
return ret;
activate_failed:
GST_ELEMENT_ERROR (self, RESOURCE, SETTINGS,
("failed to activate bufferpool"), ("failed to activate bufferpool"));
g_object_unref (pool);
return GST_FLOW_ERROR;
alloc_failed:
GST_DEBUG_OBJECT (self, "could not allocate buffer from pool");
return ret;
}
static GstFlowReturn
gst_v4l2_transform_transform (GstBaseTransform * trans, GstBuffer * inbuf,
GstBuffer * outbuf)
{
/* Nothing to do */
return GST_FLOW_OK;
}
static gboolean
gst_v4l2_transform_sink_event (GstBaseTransform * trans, GstEvent * event)
{
GstV4l2Transform *self = GST_V4L2_TRANSFORM (trans);
gboolean ret;
GstEventType type = GST_EVENT_TYPE (event);
/* Nothing to flush in passthrough */
if (gst_base_transform_is_passthrough (trans))
return GST_BASE_TRANSFORM_CLASS (parent_class)->sink_event (trans, event);
switch (type) {
case GST_EVENT_FLUSH_START:
GST_DEBUG_OBJECT (self, "flush start");
gst_v4l2_object_unlock (self->v4l2output);
gst_v4l2_object_unlock (self->v4l2capture);
break;
default:
break;
}
ret = GST_BASE_TRANSFORM_CLASS (parent_class)->sink_event (trans, event);
switch (type) {
case GST_EVENT_FLUSH_STOP:
/* Buffer should be back now */
GST_DEBUG_OBJECT (self, "flush stop");
gst_v4l2_object_unlock_stop (self->v4l2capture);
gst_v4l2_object_unlock_stop (self->v4l2output);
gst_v4l2_buffer_pool_flush (self->v4l2output);
gst_v4l2_buffer_pool_flush (self->v4l2capture);
break;
default:
break;
}
return ret;
}
static GstStateChangeReturn
gst_v4l2_transform_change_state (GstElement * element,
GstStateChange transition)
{
GstV4l2Transform *self = GST_V4L2_TRANSFORM (element);
GstStateChangeReturn ret;
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
if (!gst_v4l2_transform_open (self))
return GST_STATE_CHANGE_FAILURE;
break;
case GST_STATE_CHANGE_PAUSED_TO_READY:
gst_v4l2_object_unlock (self->v4l2output);
gst_v4l2_object_unlock (self->v4l2capture);
break;
default:
break;
}
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
switch (transition) {
case GST_STATE_CHANGE_READY_TO_NULL:
gst_v4l2_transform_close (self);
break;
default:
break;
}
return ret;
}
static void
gst_v4l2_transform_dispose (GObject * object)
{
GstV4l2Transform *self = GST_V4L2_TRANSFORM (object);
gst_caps_replace (&self->probed_sinkcaps, NULL);
gst_caps_replace (&self->probed_srccaps, NULL);
G_OBJECT_CLASS (parent_class)->dispose (object);
}
static void
gst_v4l2_transform_finalize (GObject * object)
{
GstV4l2Transform *self = GST_V4L2_TRANSFORM (object);
gst_v4l2_object_destroy (self->v4l2capture);
gst_v4l2_object_destroy (self->v4l2output);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gst_v4l2_transform_init (GstV4l2Transform * self)
{
/* V4L2 object are created in subinstance_init */
/* enable QoS */
gst_base_transform_set_qos_enabled (GST_BASE_TRANSFORM (self), TRUE);
}
static void
gst_v4l2_transform_subinstance_init (GTypeInstance * instance, gpointer g_class)
{
GstV4l2TransformClass *klass = GST_V4L2_TRANSFORM_CLASS (g_class);
GstV4l2Transform *self = GST_V4L2_TRANSFORM (instance);
self->v4l2output = gst_v4l2_object_new (GST_ELEMENT (self),
GST_OBJECT (GST_BASE_TRANSFORM_SINK_PAD (self)),
V4L2_BUF_TYPE_VIDEO_OUTPUT, klass->default_device,
gst_v4l2_get_output, gst_v4l2_set_output, NULL);
self->v4l2output->no_initial_format = TRUE;
self->v4l2output->keep_aspect = FALSE;
self->v4l2capture = gst_v4l2_object_new (GST_ELEMENT (self),
GST_OBJECT (GST_BASE_TRANSFORM_SRC_PAD (self)),
V4L2_BUF_TYPE_VIDEO_CAPTURE, klass->default_device,
gst_v4l2_get_input, gst_v4l2_set_input, NULL);
}
static void
gst_v4l2_transform_class_init (GstV4l2TransformClass * klass)
{
GstElementClass *element_class;
GObjectClass *gobject_class;
GstBaseTransformClass *base_transform_class;
element_class = (GstElementClass *) klass;
gobject_class = (GObjectClass *) klass;
base_transform_class = (GstBaseTransformClass *) klass;
GST_DEBUG_CATEGORY_INIT (gst_v4l2_transform_debug, "v4l2transform", 0,
"V4L2 Converter");
gst_element_class_set_static_metadata (element_class,
"V4L2 Video Converter",
"Filter/Converter/Video/Scaler",
"Transform streams via V4L2 API",
"Nicolas Dufresne <nicolas.dufresne@collabora.com>");
gobject_class->dispose = GST_DEBUG_FUNCPTR (gst_v4l2_transform_dispose);
gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_v4l2_transform_finalize);
gobject_class->set_property =
GST_DEBUG_FUNCPTR (gst_v4l2_transform_set_property);
gobject_class->get_property =
GST_DEBUG_FUNCPTR (gst_v4l2_transform_get_property);
base_transform_class->stop = GST_DEBUG_FUNCPTR (gst_v4l2_transform_stop);
base_transform_class->set_caps =
GST_DEBUG_FUNCPTR (gst_v4l2_transform_set_caps);
base_transform_class->query = GST_DEBUG_FUNCPTR (gst_v4l2_transform_query);
base_transform_class->sink_event =
GST_DEBUG_FUNCPTR (gst_v4l2_transform_sink_event);
base_transform_class->decide_allocation =
GST_DEBUG_FUNCPTR (gst_v4l2_transform_decide_allocation);
base_transform_class->propose_allocation =
GST_DEBUG_FUNCPTR (gst_v4l2_transform_propose_allocation);
base_transform_class->transform_caps =
GST_DEBUG_FUNCPTR (gst_v4l2_transform_transform_caps);
base_transform_class->fixate_caps =
GST_DEBUG_FUNCPTR (gst_v4l2_transform_fixate_caps);
base_transform_class->prepare_output_buffer =
GST_DEBUG_FUNCPTR (gst_v4l2_transform_prepare_output_buffer);
base_transform_class->transform =
GST_DEBUG_FUNCPTR (gst_v4l2_transform_transform);
base_transform_class->passthrough_on_same_caps = TRUE;
element_class->change_state =
GST_DEBUG_FUNCPTR (gst_v4l2_transform_change_state);
gst_v4l2_object_install_m2m_properties_helper (gobject_class);
g_object_class_install_property (gobject_class, PROP_DISABLE_PASSTHROUGH,
g_param_spec_boolean ("disable-passthrough", "Disable Passthrough",
"Forces passing buffers through the converter", FALSE,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
}
static void
gst_v4l2_transform_subclass_init (gpointer g_class, gpointer data)
{
GstV4l2TransformClass *klass = GST_V4L2_TRANSFORM_CLASS (g_class);
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
GstV4l2TransformCData *cdata = data;
klass->default_device = cdata->device;
gst_element_class_add_pad_template (element_class,
gst_pad_template_new ("sink", GST_PAD_SINK, GST_PAD_ALWAYS,
cdata->sink_caps));
gst_element_class_add_pad_template (element_class,
gst_pad_template_new ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
cdata->src_caps));
gst_caps_unref (cdata->sink_caps);
gst_caps_unref (cdata->src_caps);
g_free (cdata);
}
/* Probing functions */
gboolean
gst_v4l2_is_transform (GstCaps * sink_caps, GstCaps * src_caps)
{
gboolean ret = FALSE;
if (gst_caps_is_subset (sink_caps, gst_v4l2_object_get_raw_caps ())
&& gst_caps_is_subset (src_caps, gst_v4l2_object_get_raw_caps ()))
ret = TRUE;
return ret;
}
void
gst_v4l2_transform_register (GstPlugin * plugin, const gchar * basename,
const gchar * device_path, GstCaps * sink_caps, GstCaps * src_caps)
{
GTypeQuery type_query;
GTypeInfo type_info = { 0, };
GType type, subtype;
gchar *type_name;
GstV4l2TransformCData *cdata;
cdata = g_new0 (GstV4l2TransformCData, 1);
cdata->device = g_strdup (device_path);
cdata->sink_caps = gst_caps_ref (sink_caps);
cdata->src_caps = gst_caps_ref (src_caps);
type = gst_v4l2_transform_get_type ();
g_type_query (type, &type_query);
memset (&type_info, 0, sizeof (type_info));
type_info.class_size = type_query.class_size;
type_info.instance_size = type_query.instance_size;
type_info.class_init = gst_v4l2_transform_subclass_init;
type_info.class_data = cdata;
type_info.instance_init = gst_v4l2_transform_subinstance_init;
if (g_type_from_name ("v4l2convert") != 0)
type_name = g_strdup_printf ("v4l2%sconvert", basename);
else
type_name = g_strdup ("v4l2convert");
subtype = g_type_register_static (type, type_name, &type_info, 0);
if (!gst_element_register (plugin, type_name, GST_RANK_NONE, subtype))
GST_WARNING ("Failed to register plugin '%s'", type_name);
g_free (type_name);
}
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