gstreamer/ext/cog/gstcogscale.c

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/* GStreamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
* Copyright (C) 2005 David Schleef <ds@schleef.org>
*
* 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.
*/
/**
* SECTION:element-videoscale
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* @see_also: videorate, videoconvert
*
* <refsect2>
* <para>
* This element resizes video frames. By default the element will try to
* negotiate to the same size on the source and sinkpad so that no scaling
* is needed. It is therefore safe to insert this element in a pipeline to
* get more robust behaviour without any cost if no scaling is needed.
* </para>
* <para>
* This element supports a wide range of color spaces including various YUV and
* RGB formats and is therefore generally able to operate anywhere in a
* pipeline.
* </para>
* <title>Example pipelines</title>
* <para>
* <programlisting>
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* gst-launch -v filesrc location=videotestsrc.ogg ! oggdemux ! theoradec ! videoconvert ! videoscale ! ximagesink
* </programlisting>
* Decode an Ogg/Theora and display the video using ximagesink. Since
* ximagesink cannot perform scaling, the video scaling will be performed by
* videoscale when you resize the video window.
* To create the test Ogg/Theora file refer to the documentation of theoraenc.
* </para>
* <para>
* <programlisting>
* gst-launch -v filesrc location=videotestsrc.ogg ! oggdemux ! theoradec ! videoscale ! video/x-raw-yuv, width=50 ! xvimagesink
* </programlisting>
* Decode an Ogg/Theora and display the video using xvimagesink with a width of
* 50.
* </para>
* </refsect2>
*
* Last reviewed on 2006-03-02 (0.10.4)
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include <gst/gst.h>
#include <gst/video/video.h>
#include <gst/base/gstbasetransform.h>
#include <cog/cog.h>
#include <cog/cogvirtframe.h>
#include "gstcogutils.h"
GST_DEBUG_CATEGORY_STATIC (cog_scale_debug);
#define GST_CAT_DEFAULT cog_scale_debug
#define GST_TYPE_COG_SCALE \
(gst_cog_scale_get_type())
#define GST_COG_SCALE(obj) \
(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_COG_SCALE,GstCogScale))
#define GST_COG_SCALE_CLASS(klass) \
(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_COG_SCALE,GstCogScaleClass))
#define GST_IS_COG_SCALE(obj) \
(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_COG_SCALE))
#define GST_IS_COG_SCALE_CLASS(klass) \
(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_COG_SCALE))
typedef struct _GstCogScale GstCogScale;
typedef struct _GstCogScaleClass GstCogScaleClass;
/**
* GstCogScale:
*
* Opaque data structure
*/
struct _GstCogScale
{
GstBaseTransform element;
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int quality;
/* negotiated stuff */
GstVideoFormat format;
guint src_size;
guint dest_size;
gint to_width;
gint to_height;
gint from_width;
gint from_height;
/*< private > */
};
struct _GstCogScaleClass
{
GstBaseTransformClass parent_class;
};
GType gst_cog_scale_get_type (void);
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#define DEFAULT_QUALITY 5
enum
{
PROP_0,
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PROP_QUALITY
};
/* can't handle width/height of 1 yet, since we divide a lot by (n-1) */
#undef GST_VIDEO_SIZE_RANGE
#define GST_VIDEO_SIZE_RANGE "(int) [ 2, MAX ]"
#define TEMPLATE_CAPS \
GST_STATIC_CAPS (GST_VIDEO_CAPS_YUV ("{ I420, YV12, YUY2, UYVY, AYUV, Y42B }") ";" \
GST_VIDEO_CAPS_ARGB)
static GstStaticPadTemplate gst_cog_scale_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
TEMPLATE_CAPS);
static GstStaticPadTemplate gst_cog_scale_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
TEMPLATE_CAPS);
static void gst_cog_scale_base_init (gpointer g_class);
static void gst_cog_scale_class_init (GstCogScaleClass * klass);
static void gst_cog_scale_init (GstCogScale * videoscale);
static void gst_cog_scale_finalize (GstCogScale * videoscale);
static gboolean gst_cog_scale_src_event (GstBaseTransform * trans,
GstEvent * event);
/* base transform vmethods */
static GstCaps *gst_cog_scale_transform_caps (GstBaseTransform * trans,
GstPadDirection direction, GstCaps * caps);
static gboolean gst_cog_scale_set_caps (GstBaseTransform * trans,
GstCaps * in, GstCaps * out);
static gboolean gst_cog_scale_get_unit_size (GstBaseTransform * trans,
GstCaps * caps, guint * size);
static GstFlowReturn gst_cog_scale_transform (GstBaseTransform * trans,
GstBuffer * in, GstBuffer * out);
static void gst_cog_scale_fixate_caps (GstBaseTransform * base,
GstPadDirection direction, GstCaps * caps, GstCaps * othercaps);
static void gst_cog_scale_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_cog_scale_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static GstElementClass *parent_class = NULL;
GType
gst_cog_scale_get_type (void)
{
static GType cog_scale_type = 0;
if (!cog_scale_type) {
static const GTypeInfo cog_scale_info = {
sizeof (GstCogScaleClass),
gst_cog_scale_base_init,
NULL,
(GClassInitFunc) gst_cog_scale_class_init,
NULL,
NULL,
sizeof (GstCogScale),
0,
(GInstanceInitFunc) gst_cog_scale_init,
};
cog_scale_type =
g_type_register_static (GST_TYPE_BASE_TRANSFORM, "GstCogScale",
&cog_scale_info, 0);
GST_DEBUG_CATEGORY_INIT (cog_scale_debug, "cogscale", 0, "Cog scale");
}
return cog_scale_type;
}
static void
gst_cog_scale_base_init (gpointer g_class)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_set_static_metadata (element_class, "Video scaler",
"Filter/Effect/Video",
"Resizes video", "Wim Taymans <wim.taymans@chello.be>");
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_cog_scale_src_template));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_cog_scale_sink_template));
}
static void
gst_cog_scale_class_init (GstCogScaleClass * klass)
{
GObjectClass *gobject_class;
GstBaseTransformClass *trans_class;
gobject_class = (GObjectClass *) klass;
trans_class = (GstBaseTransformClass *) klass;
gobject_class->finalize = (GObjectFinalizeFunc) gst_cog_scale_finalize;
gobject_class->set_property = gst_cog_scale_set_property;
gobject_class->get_property = gst_cog_scale_get_property;
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g_object_class_install_property (gobject_class, PROP_QUALITY,
g_param_spec_int ("quality", "quality", "Scaling Quality",
0, 10, DEFAULT_QUALITY, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
trans_class->transform_caps =
GST_DEBUG_FUNCPTR (gst_cog_scale_transform_caps);
trans_class->set_caps = GST_DEBUG_FUNCPTR (gst_cog_scale_set_caps);
trans_class->get_unit_size = GST_DEBUG_FUNCPTR (gst_cog_scale_get_unit_size);
trans_class->transform = GST_DEBUG_FUNCPTR (gst_cog_scale_transform);
trans_class->fixate_caps = GST_DEBUG_FUNCPTR (gst_cog_scale_fixate_caps);
trans_class->src_event = GST_DEBUG_FUNCPTR (gst_cog_scale_src_event);
trans_class->passthrough_on_same_caps = TRUE;
parent_class = g_type_class_peek_parent (klass);
}
static void
gst_cog_scale_init (GstCogScale * videoscale)
{
gst_base_transform_set_qos_enabled (GST_BASE_TRANSFORM (videoscale), TRUE);
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videoscale->quality = DEFAULT_QUALITY;
}
static void
gst_cog_scale_finalize (GstCogScale * videoscale)
{
G_OBJECT_CLASS (parent_class)->finalize (G_OBJECT (videoscale));
}
static void
gst_cog_scale_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstCogScale *vscale = GST_COG_SCALE (object);
switch (prop_id) {
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case PROP_QUALITY:
GST_OBJECT_LOCK (vscale);
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vscale->quality = g_value_get_int (value);
GST_OBJECT_UNLOCK (vscale);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_cog_scale_get_property (GObject * object, guint prop_id, GValue * value,
GParamSpec * pspec)
{
GstCogScale *vscale = GST_COG_SCALE (object);
switch (prop_id) {
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case PROP_QUALITY:
GST_OBJECT_LOCK (vscale);
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g_value_set_int (value, vscale->quality);
GST_OBJECT_UNLOCK (vscale);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static GstCaps *
gst_cog_scale_transform_caps (GstBaseTransform * trans,
GstPadDirection direction, GstCaps * caps)
{
GstCaps *ret;
GstStructure *structure;
const GValue *par;
/* this function is always called with a simple caps */
g_return_val_if_fail (GST_CAPS_IS_SIMPLE (caps), NULL);
structure = gst_caps_get_structure (caps, 0);
ret = gst_caps_copy (caps);
structure = gst_caps_get_structure (ret, 0);
gst_structure_set (structure,
"width", GST_TYPE_INT_RANGE, 1, G_MAXINT,
"height", GST_TYPE_INT_RANGE, 1, G_MAXINT, NULL);
/* if pixel aspect ratio, make a range of it */
if ((par = gst_structure_get_value (structure, "pixel-aspect-ratio"))) {
GstCaps *copy;
GstStructure *cstruct;
/* copy input PAR first, this is the prefered PAR */
gst_structure_set_value (structure, "pixel-aspect-ratio", par);
/* then make a copy with a fraction range as a second choice */
copy = gst_caps_copy (ret);
cstruct = gst_caps_get_structure (copy, 0);
gst_structure_set (cstruct,
"pixel-aspect-ratio", GST_TYPE_FRACTION_RANGE, 0, 1, G_MAXINT, 1, NULL);
/* and append */
gst_caps_append (ret, copy);
}
GST_DEBUG_OBJECT (trans, "returning caps: %" GST_PTR_FORMAT, ret);
return ret;
}
static gboolean
gst_cog_scale_set_caps (GstBaseTransform * trans, GstCaps * in, GstCaps * out)
{
GstCogScale *videoscale;
gboolean ret;
videoscale = GST_COG_SCALE (trans);
ret = gst_video_format_parse_caps (in, &videoscale->format,
&videoscale->from_width, &videoscale->from_height);
ret &= gst_video_format_parse_caps (out, NULL,
&videoscale->to_width, &videoscale->to_height);
if (!ret)
goto done;
videoscale->src_size = gst_video_format_get_size (videoscale->format,
videoscale->from_width, videoscale->from_height);
videoscale->dest_size = gst_video_format_get_size (videoscale->format,
videoscale->to_width, videoscale->to_height);
/* FIXME: par */
GST_DEBUG_OBJECT (videoscale, "from=%dx%d, size %d -> to=%dx%d, size %d",
videoscale->from_width, videoscale->from_height, videoscale->src_size,
videoscale->to_width, videoscale->to_height, videoscale->dest_size);
done:
return ret;
}
static gboolean
gst_cog_scale_get_unit_size (GstBaseTransform * trans, GstCaps * caps,
guint * size)
{
GstVideoFormat format;
gint width, height;
g_assert (size);
if (!gst_video_format_parse_caps (caps, &format, &width, &height))
return FALSE;
*size = gst_video_format_get_size (format, width, height);
return TRUE;
}
static void
gst_cog_scale_fixate_caps (GstBaseTransform * base, GstPadDirection direction,
GstCaps * caps, GstCaps * othercaps)
{
GstStructure *ins, *outs;
const GValue *from_par, *to_par;
g_return_if_fail (gst_caps_is_fixed (caps));
GST_DEBUG_OBJECT (base, "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);
from_par = gst_structure_get_value (ins, "pixel-aspect-ratio");
to_par = gst_structure_get_value (outs, "pixel-aspect-ratio");
/* we have both PAR but they might not be fixated */
if (from_par && to_par) {
gint from_w, from_h, from_par_n, from_par_d, to_par_n, to_par_d;
gint count = 0, w = 0, h = 0;
guint num, den;
/* from_par should be fixed */
g_return_if_fail (gst_value_is_fixed (from_par));
from_par_n = gst_value_get_fraction_numerator (from_par);
from_par_d = gst_value_get_fraction_denominator (from_par);
/* fixate the out PAR */
if (!gst_value_is_fixed (to_par)) {
GST_DEBUG_OBJECT (base, "fixating to_par to %dx%d", from_par_n,
from_par_d);
gst_structure_fixate_field_nearest_fraction (outs, "pixel-aspect-ratio",
from_par_n, from_par_d);
}
to_par_n = gst_value_get_fraction_numerator (to_par);
to_par_d = gst_value_get_fraction_denominator (to_par);
/* if both width and height are already fixed, we can't do anything
* about it anymore */
if (gst_structure_get_int (outs, "width", &w))
++count;
if (gst_structure_get_int (outs, "height", &h))
++count;
if (count == 2) {
GST_DEBUG_OBJECT (base, "dimensions already set to %dx%d, not fixating",
w, h);
return;
}
gst_structure_get_int (ins, "width", &from_w);
gst_structure_get_int (ins, "height", &from_h);
if (!gst_video_calculate_display_ratio (&num, &den, from_w, from_h,
from_par_n, from_par_d, to_par_n, to_par_d)) {
GST_ELEMENT_ERROR (base, CORE, NEGOTIATION, (NULL),
("Error calculating the output scaled size - integer overflow"));
return;
}
GST_DEBUG_OBJECT (base,
"scaling input with %dx%d and PAR %d/%d to output PAR %d/%d",
from_w, from_h, from_par_n, from_par_d, to_par_n, to_par_d);
GST_DEBUG_OBJECT (base, "resulting output should respect ratio of %d/%d",
num, den);
/* now find a width x height that respects this display ratio.
* prefer those that have one of w/h the same as the incoming video
* using wd / hd = num / den */
/* if one of the output width or height is fixed, we work from there */
if (h) {
GST_DEBUG_OBJECT (base, "height is fixed,scaling width");
w = (guint) gst_util_uint64_scale_int (h, num, den);
} else if (w) {
GST_DEBUG_OBJECT (base, "width is fixed, scaling height");
h = (guint) gst_util_uint64_scale_int (w, den, num);
} else {
/* none of width or height is fixed, figure out both of them based only on
* the input width and height */
/* check hd / den is an integer scale factor, and scale wd with the PAR */
if (from_h % den == 0) {
GST_DEBUG_OBJECT (base, "keeping video height");
h = from_h;
w = (guint) gst_util_uint64_scale_int (h, num, den);
} else if (from_w % num == 0) {
GST_DEBUG_OBJECT (base, "keeping video width");
w = from_w;
h = (guint) gst_util_uint64_scale_int (w, den, num);
} else {
GST_DEBUG_OBJECT (base, "approximating but keeping video height");
h = from_h;
w = (guint) gst_util_uint64_scale_int (h, num, den);
}
}
GST_DEBUG_OBJECT (base, "scaling to %dx%d", w, h);
/* now fixate */
gst_structure_fixate_field_nearest_int (outs, "width", w);
gst_structure_fixate_field_nearest_int (outs, "height", h);
} else {
gint width, height;
if (gst_structure_get_int (ins, "width", &width)) {
if (gst_structure_has_field (outs, "width")) {
gst_structure_fixate_field_nearest_int (outs, "width", width);
}
}
if (gst_structure_get_int (ins, "height", &height)) {
if (gst_structure_has_field (outs, "height")) {
gst_structure_fixate_field_nearest_int (outs, "height", height);
}
}
}
GST_DEBUG_OBJECT (base, "fixated othercaps to %" GST_PTR_FORMAT, othercaps);
}
#if 0
static gboolean
gst_cog_scale_prepare_image (gint format, GstBuffer * buf,
VSImage * img, VSImage * img_u, VSImage * img_v)
{
gboolean res = TRUE;
img->pixels = GST_BUFFER_DATA (buf);
switch (format) {
case GST_VIDEO_FORMAT_I420:
case GST_VIDEO_FORMAT_YV12:
img_u->pixels = img->pixels + GST_ROUND_UP_2 (img->height) * img->stride;
img_u->height = GST_ROUND_UP_2 (img->height) / 2;
img_u->width = GST_ROUND_UP_2 (img->width) / 2;
img_u->stride = GST_ROUND_UP_4 (img_u->width);
memcpy (img_v, img_u, sizeof (*img_v));
img_v->pixels = img_u->pixels + img_u->height * img_u->stride;
break;
default:
break;
}
return res;
}
#endif
static GstFlowReturn
gst_cog_scale_transform (GstBaseTransform * trans, GstBuffer * in,
GstBuffer * out)
{
GstCogScale *videoscale;
GstFlowReturn ret = GST_FLOW_OK;
CogFrame *outframe;
CogFrame *frame;
int w, h;
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int quality;
static const int n_vert_taps[11] = { 1, 1, 2, 2, 2, 2, 4, 4, 4, 4, 4 };
static const int n_horiz_taps[11] = { 1, 1, 1, 1, 2, 2, 2, 2, 4, 4, 4 };
videoscale = GST_COG_SCALE (trans);
GST_OBJECT_LOCK (videoscale);
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quality = videoscale->quality;
GST_OBJECT_UNLOCK (videoscale);
frame = gst_cog_buffer_wrap (gst_buffer_ref (in), videoscale->format,
videoscale->from_width, videoscale->from_height);
outframe = gst_cog_buffer_wrap (gst_buffer_ref (out), videoscale->format,
videoscale->to_width, videoscale->to_height);
frame = cog_virt_frame_new_unpack (frame);
w = videoscale->from_width;
h = videoscale->from_height;
while (w >= 2 * videoscale->to_width || h >= 2 * videoscale->to_height) {
if (w >= 2 * videoscale->to_width) {
frame = cog_virt_frame_new_horiz_downsample (frame, 3);
w /= 2;
}
if (h >= 2 * videoscale->to_height) {
frame = cog_virt_frame_new_vert_downsample (frame, 4);
h /= 2;
}
}
if (w != videoscale->to_width) {
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frame = cog_virt_frame_new_horiz_resample (frame, videoscale->to_width,
n_horiz_taps[quality]);
}
if (h != videoscale->to_height) {
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frame = cog_virt_frame_new_vert_resample (frame, videoscale->to_height,
n_vert_taps[quality]);
}
switch (videoscale->format) {
case GST_VIDEO_FORMAT_YUY2:
frame = cog_virt_frame_new_pack_YUY2 (frame);
break;
case GST_VIDEO_FORMAT_UYVY:
frame = cog_virt_frame_new_pack_UYVY (frame);
break;
default:
break;
}
cog_virt_frame_render (frame, outframe);
cog_frame_unref (frame);
cog_frame_unref (outframe);
GST_LOG_OBJECT (videoscale, "pushing buffer of %d bytes",
GST_BUFFER_SIZE (out));
return ret;
/* ERRORS */
#if 0
unsupported:
{
GST_ELEMENT_ERROR (videoscale, STREAM, NOT_IMPLEMENTED, (NULL),
("Unsupported format %d for scaling method %d",
videoscale->format, method));
return GST_FLOW_ERROR;
}
unknown_mode:
{
GST_ELEMENT_ERROR (videoscale, STREAM, NOT_IMPLEMENTED, (NULL),
("Unknown scaling method %d", videoscale->method));
return GST_FLOW_ERROR;
}
#endif
}
static gboolean
gst_cog_scale_src_event (GstBaseTransform * trans, GstEvent * event)
{
GstCogScale *videoscale;
gboolean ret;
double a;
GstStructure *structure;
videoscale = GST_COG_SCALE (trans);
GST_DEBUG_OBJECT (videoscale, "handling %s event",
GST_EVENT_TYPE_NAME (event));
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_NAVIGATION:
event =
GST_EVENT (gst_mini_object_make_writable (GST_MINI_OBJECT (event)));
structure = (GstStructure *) gst_event_get_structure (event);
if (gst_structure_get_double (structure, "pointer_x", &a)) {
gst_structure_set (structure, "pointer_x", G_TYPE_DOUBLE,
a * videoscale->from_width / videoscale->to_width, NULL);
}
if (gst_structure_get_double (structure, "pointer_y", &a)) {
gst_structure_set (structure, "pointer_y", G_TYPE_DOUBLE,
a * videoscale->from_height / videoscale->to_height, NULL);
}
break;
case GST_EVENT_QOS:
break;
default:
break;
}
ret = GST_BASE_TRANSFORM_CLASS (parent_class)->src_event (trans, event);
return ret;
}