Commit b7811566 authored by Nicolas Dufresne's avatar Nicolas Dufresne

Implement GstV4l2Transform

Implement a v4l2 element that wraps HW video converters.
parent 0028de80
......@@ -11,6 +11,7 @@ libgstvideo4linux2_la_SOURCES = gstv4l2.c \
gstv4l2src.c \
gstv4l2radio.c \
gstv4l2tuner.c \
gstv4l2transform.c \
gstv4l2videodec.c \
gstv4l2vidorient.c \
v4l2_calls.c \
......@@ -50,6 +51,7 @@ noinst_HEADERS = \
gstv4l2src.h \
gstv4l2radio.h \
gstv4l2tuner.h \
gstv4l2transform.h \
gstv4l2videodec.h \
gstv4l2vidorient.h \
v4l2_calls.h \
......
......@@ -44,6 +44,7 @@
#include "gstv4l2radio.h"
#include "gstv4l2videodec.h"
#include "gstv4l2devicemonitor.h"
#include "gstv4l2transform.h"
/* used in v4l2_calls.c and v4l2src_calls.c */
GST_DEBUG_CATEGORY (v4l2_debug);
......@@ -148,6 +149,9 @@ gst_v4l2_probe_and_register (GstPlugin * plugin)
if (gst_v4l2_is_video_dec (sink_caps, src_caps))
ret = gst_v4l2_video_dec_register (plugin, basename, it->device_path,
sink_caps, src_caps);
else if (gst_v4l2_is_transform (sink_caps, src_caps))
ret = gst_v4l2_transform_register (plugin, basename, it->device_path,
sink_caps, src_caps);
/* else if ( ... etc. */
gst_caps_unref (sink_caps);
......
......@@ -1539,6 +1539,10 @@ gst_v4l2_object_add_aspect_ratio (GstV4l2Object * v4l2object, GstStructure * s)
num = cropcap.pixelaspect.numerator;
den = cropcap.pixelaspect.denominator;
/* Ignore PAR that are 0/0 */
if (den == 0)
return;
done:
gst_structure_set (s, "pixel-aspect-ratio", GST_TYPE_FRACTION, num, den,
NULL);
......
/*
* 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 "gstv4l2transform.h"
#include "v4l2_calls.h"
#include <string.h>
#include <gst/gst-i18n-plugin.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_CAPTURE_IO_MODE,
};
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) {
/* Split IO mode so output is configure through 'io-mode' and capture
* through 'capture-io-mode' */
case PROP_IO_MODE:
gst_v4l2_object_set_property_helper (self->v4l2output, prop_id, value,
pspec);
break;
case PROP_CAPTURE_IO_MODE:
gst_v4l2_object_set_property_helper (self->v4l2capture, prop_id, value,
pspec);
break;
case PROP_DEVICE:
gst_v4l2_object_set_property_helper (self->v4l2output, prop_id, value,
pspec);
gst_v4l2_object_set_property_helper (self->v4l2capture, prop_id, value,
pspec);
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_IO_MODE:
gst_v4l2_object_get_property_helper (self->v4l2output, prop_id, value,
pspec);
break;
case PROP_CAPTURE_IO_MODE:
gst_v4l2_object_get_property_helper (self->v4l2output, PROP_IO_MODE,
value, pspec);
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_start (GstBaseTransform * trans)
{
GstV4l2Transform *self = GST_V4L2_TRANSFORM (trans);
GST_DEBUG_OBJECT (self, "Opening");
if (!gst_v4l2_object_open (self->v4l2output))
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);
return FALSE;
}
static gboolean
gst_v4l2_transform_stop (GstBaseTransform * trans)
{
GstV4l2Transform *self = GST_V4L2_TRANSFORM (trans);
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);
return TRUE;
}
static gboolean
gst_v4l2_transform_set_caps (GstBaseTransform * trans, GstCaps * incaps,
GstCaps * outcaps)
{
GstV4l2Transform *self = GST_V4L2_TRANSFORM (trans);
/* TODO Add renegotiation support */
g_return_val_if_fail (!GST_V4L2_IS_ACTIVE (self->v4l2output), FALSE);
g_return_val_if_fail (!GST_V4L2_IS_ACTIVE (self->v4l2capture), FALSE);
if (!gst_v4l2_object_set_format (self->v4l2output, incaps))
goto incaps_failed;
if (!gst_v4l2_object_set_format (self->v4l2capture, outcaps))
goto outcaps_failed;
return TRUE;
incaps_failed:
{
GST_ERROR_OBJECT (self, "failed to set input caps: %" GST_PTR_FORMAT,
incaps);
return FALSE;
}
outcaps_failed:
{
gst_v4l2_object_stop (self->v4l2output);
GST_ERROR_OBJECT (self, "failed to set output caps: %" GST_PTR_FORMAT,
outcaps);
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_srccaps)
caps = gst_caps_ref (self->probed_srccaps);
}
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;
if (gst_v4l2_object_decide_allocation (self->v4l2capture, query))
ret = GST_BASE_TRANSFORM_CLASS (parent_class)->decide_allocation (trans,
query);
return ret;
}
/* TODO */
#if 0
static gboolean
gst_v4l2_transform_propose_allocation (GstBaseTransform * trans,
GstQuery * decide_query, GstQuery * query)
{
GstV4l2Transform *self = GST_V4L2_TRANSFORM (trans);
gboolean ret = FALSE;
/* FIXME propose alloc this need to be moved from src to v4l2object */
if (gst_v4l2_object_propose_allocation (self->v4l2output, query))
ret = GST_BASE_TRANSFORM_CLASS (parent_class)->propose_allocation (trans,
query);
return ret;
}
#endif
/* 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",
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)
{
GstCaps *result;
GST_DEBUG_OBJECT (trans, "trying to fixate othercaps %" GST_PTR_FORMAT
" based on caps %" GST_PTR_FORMAT, othercaps, caps);
result = gst_caps_intersect (othercaps, caps);
if (gst_caps_is_empty (result)) {
gst_caps_unref (result);
result = othercaps;
} else {
gst_caps_unref (othercaps);
}
GST_DEBUG_OBJECT (trans, "now fixating %" GST_PTR_FORMAT, result);
result = gst_caps_fixate (result);
return result;
}
static GstFlowReturn
gst_v4l2_transform_prepare_output_buffer (GstBaseTransform * trans,
GstBuffer * inbuf, GstBuffer ** outbuf)
{
GstV4l2Transform *self = GST_V4L2_TRANSFORM (trans);
GstBufferPool *pool = GST_BUFFER_POOL (self->v4l2output->pool);
GstFlowReturn ret = GST_FLOW_OK;
if (gst_base_transform_is_passthrough (trans)) {
GST_DEBUG_OBJECT (self, "Passthrough, no need to do anything");
*outbuf = inbuf;
goto beach;
}
GST_DEBUG_OBJECT (self, "Queue input buffer");
ret = gst_v4l2_buffer_pool_process (GST_V4L2_BUFFER_POOL (pool), inbuf);
if (ret != GST_FLOW_OK)
goto beach;
pool = gst_base_transform_get_buffer_pool (trans);
if (!gst_buffer_pool_is_active (pool)) {
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 = self->v4l2capture->pool;
ret = gst_v4l2_buffer_pool_process (GST_V4L2_BUFFER_POOL (pool), *outbuf);
if (ret != GST_FLOW_OK) {
gst_buffer_unref (*outbuf);
*outbuf = NULL;
}
beach:
return ret;
activate_failed:
GST_ELEMENT_ERROR (self, RESOURCE, SETTINGS,
("failed to activate bufferpool"), ("failed to activate bufferpool"));
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);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_FLUSH_START:
gst_v4l2_object_unlock (self->v4l2output);
gst_v4l2_object_unlock (self->v4l2capture);
default:
break;
}
return GST_BASE_TRANSFORM_CLASS (parent_class)->sink_event (trans, event);
}
static GstStateChangeReturn
gst_v4l2_transform_change_state (GstElement * element,
GstStateChange transition)
{
GstV4l2Transform *self = GST_V4L2_TRANSFORM (element);
if (transition == GST_STATE_CHANGE_PAUSED_TO_READY) {
gst_v4l2_object_unlock (self->v4l2output);
gst_v4l2_object_unlock (self->v4l2capture);
}
return GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
}
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 */
}
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_element_class_set_static_metadata (element_class,
"V4L2 Video Converter",
"Filter/Converter/Video",
"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->start = GST_DEBUG_FUNCPTR (gst_v4l2_transform_start);
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);
/* TODO */
#if 0
base_transform_class->propose_allocation =
GST_DEBUG_FUNCPTR (gst_v4l2_transform_propose_allocation);
#endif
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;
/* FIXME need this ? */
element_class->change_state =
GST_DEBUG_FUNCPTR (gst_v4l2_transform_change_state);
gst_v4l2_object_install_properties_helper (gobject_class,
DEFAULT_PROP_DEVICE);
/**
* GstV4l2Transform:capture-io-mode
*
* Capture IO Mode
*/
g_object_class_install_property (gobject_class, PROP_IO_MODE,
g_param_spec_enum ("capture-io-mode", "Capture IO mode",