gstreamer/ext/libav/gstavscale.c

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/* GStreamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
* This file:
* Copyright (C) 2005 Luca Ognibene <luogni@tin.it>
* Copyright (C) 2006 Martin Zlomek <martin.zlomek@itonis.tv>
*
* 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
2012-11-04 00:22:16 +00:00
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <libavcodec/avcodec.h>
#include <gst/gst.h>
#include <gst/base/gstbasetransform.h>
#include <gst/video/video.h>
#include "gstffmpeg.h"
#include "gstffmpegcodecmap.h"
typedef struct _GstFFMpegScale
{
GstBaseTransform element;
GstPad *sinkpad, *srcpad;
gint in_width, in_height;
gint out_width, out_height;
enum PixelFormat pixfmt;
ImgReSampleContext *res;
} GstFFMpegScale;
typedef struct _GstFFMpegScaleClass
{
GstBaseTransformClass parent_class;
} GstFFMpegScaleClass;
#define GST_TYPE_FFMPEGSCALE \
(gst_ffmpegscale_get_type())
#define GST_FFMPEGSCALE(obj) \
(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_FFMPEGSCALE,GstFFMpegScale))
#define GST_FFMPEGSCALE_CLASS(klass) \
(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_FFMPEGSCALE,GstFFMpegScaleClass))
#define GST_IS_FFMPEGSCALE(obj) \
(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_FFMPEGSCALE))
#define GST_IS_FFMPEGSCALE_CLASS(klass) \
(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_FFMPEGSCALE))
static GstStaticPadTemplate src_factory = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_YUV ("I420"))
);
static GstStaticPadTemplate sink_factory = GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_YUV ("I420"))
);
GST_BOILERPLATE (GstFFMpegScale, gst_ffmpegscale, GstBaseTransform,
GST_TYPE_BASE_TRANSFORM);
static void gst_ffmpegscale_finalize (GObject * object);
static GstCaps *gst_ffmpegscale_transform_caps (GstBaseTransform * trans,
GstPadDirection direction, GstCaps * caps);
static void gst_ffmpegscale_fixate_caps (GstBaseTransform * trans,
GstPadDirection direction, GstCaps * caps, GstCaps * othercaps);
static gboolean gst_ffmpegscale_get_unit_size (GstBaseTransform * trans,
GstCaps * caps, guint * size);
static gboolean gst_ffmpegscale_set_caps (GstBaseTransform * trans,
GstCaps * incaps, GstCaps * outcaps);
static GstFlowReturn gst_ffmpegscale_transform (GstBaseTransform * trans,
GstBuffer * inbuf, GstBuffer * outbuf);
static gboolean gst_ffmpegscale_handle_src_event (GstPad * pad,
GstEvent * event);
static void
gst_ffmpegscale_base_init (gpointer g_class)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_add_static_pad_template (element_class, &src_factory);
gst_element_class_add_static_pad_template (element_class, &sink_factory);
gst_element_class_set_static_metadata (element_class, "libav Scale element",
"Filter/Converter/Video/Scaler",
"Converts video from one resolution to another",
"Luca Ognibene <luogni@tin.it>");
}
static void
gst_ffmpegscale_class_init (GstFFMpegScaleClass * klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
GstBaseTransformClass *trans_class = GST_BASE_TRANSFORM_CLASS (klass);
gobject_class->finalize = gst_ffmpegscale_finalize;
trans_class->transform_caps =
GST_DEBUG_FUNCPTR (gst_ffmpegscale_transform_caps);
trans_class->fixate_caps = GST_DEBUG_FUNCPTR (gst_ffmpegscale_fixate_caps);
trans_class->get_unit_size =
GST_DEBUG_FUNCPTR (gst_ffmpegscale_get_unit_size);
trans_class->set_caps = GST_DEBUG_FUNCPTR (gst_ffmpegscale_set_caps);
trans_class->transform = GST_DEBUG_FUNCPTR (gst_ffmpegscale_transform);
trans_class->passthrough_on_same_caps = TRUE;
}
static void
gst_ffmpegscale_init (GstFFMpegScale * scale, GstFFMpegScaleClass * klass)
{
GstBaseTransform *trans = GST_BASE_TRANSFORM (scale);
gst_pad_set_event_function (trans->srcpad, gst_ffmpegscale_handle_src_event);
scale->pixfmt = AV_PIX_FMT_NB;
scale->res = NULL;
}
static void
gst_ffmpegscale_finalize (GObject * object)
{
GstFFMpegScale *scale = GST_FFMPEGSCALE (object);
if (scale->res != NULL)
img_resample_close (scale->res);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static GstCaps *
gst_ffmpegscale_transform_caps (GstBaseTransform * trans,
GstPadDirection direction, GstCaps * caps)
{
GstCaps *retcaps;
int i;
retcaps = gst_caps_copy (caps);
for (i = 0; i < gst_caps_get_size (retcaps); i++) {
GstStructure *structure = gst_caps_get_structure (retcaps, i);
gst_structure_set (structure,
"width", GST_TYPE_INT_RANGE, 16, 4096,
"height", GST_TYPE_INT_RANGE, 16, 4096, NULL);
gst_structure_remove_field (structure, "pixel-aspect-ratio");
}
return retcaps;
}
static void
gst_ffmpegscale_fixate_caps (GstBaseTransform * trans,
GstPadDirection direction, GstCaps * caps, GstCaps * othercaps)
{
GstStructure *instructure = gst_caps_get_structure (caps, 0);
GstStructure *outstructure = gst_caps_get_structure (othercaps, 0);
const GValue *in_par, *out_par;
in_par = gst_structure_get_value (instructure, "pixel-aspect-ratio");
out_par = gst_structure_get_value (outstructure, "pixel-aspect-ratio");
if (in_par && out_par) {
GValue out_ratio = { 0, }; /* w/h of output video */
int in_w, in_h, in_par_n, in_par_d, out_par_n, out_par_d;
int count = 0, w = 0, h = 0, num, den;
/* if both width and height are already fixed, we can't do anything
* about it anymore */
if (gst_structure_get_int (outstructure, "width", &w))
++count;
if (gst_structure_get_int (outstructure, "height", &h))
++count;
if (count == 2) {
GST_DEBUG_OBJECT (trans, "dimensions already set to %dx%d, not fixating",
w, h);
return;
}
gst_structure_get_int (instructure, "width", &in_w);
gst_structure_get_int (instructure, "height", &in_h);
in_par_n = gst_value_get_fraction_numerator (in_par);
in_par_d = gst_value_get_fraction_denominator (in_par);
out_par_n = gst_value_get_fraction_numerator (out_par);
out_par_d = gst_value_get_fraction_denominator (out_par);
g_value_init (&out_ratio, GST_TYPE_FRACTION);
gst_value_set_fraction (&out_ratio, in_w * in_par_n * out_par_d,
in_h * in_par_d * out_par_n);
num = gst_value_get_fraction_numerator (&out_ratio);
den = gst_value_get_fraction_denominator (&out_ratio);
GST_DEBUG_OBJECT (trans,
"scaling input with %dx%d and PAR %d/%d to output PAR %d/%d",
in_w, in_h, in_par_n, in_par_d, out_par_n, out_par_d);
GST_DEBUG_OBJECT (trans, "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 */
/* start with same height, because of interlaced video */
/* check hd / den is an integer scale factor, and scale wd with the PAR */
if (in_h % den == 0) {
GST_DEBUG_OBJECT (trans, "keeping video height");
h = in_h;
w = h * num / den;
} else if (in_w % num == 0) {
GST_DEBUG_OBJECT (trans, "keeping video width");
w = in_w;
h = w * den / num;
} else {
GST_DEBUG_OBJECT (trans, "approximating but keeping video height");
h = in_h;
w = h * num / den;
}
GST_DEBUG_OBJECT (trans, "scaling to %dx%d", w, h);
/* now fixate */
gst_structure_fixate_field_nearest_int (outstructure, "width", w);
gst_structure_fixate_field_nearest_int (outstructure, "height", h);
} else {
gint width, height;
if (gst_structure_get_int (instructure, "width", &width)) {
if (gst_structure_has_field (outstructure, "width"))
gst_structure_fixate_field_nearest_int (outstructure, "width", width);
}
if (gst_structure_get_int (instructure, "height", &height)) {
if (gst_structure_has_field (outstructure, "height"))
gst_structure_fixate_field_nearest_int (outstructure, "height", height);
}
}
}
static gboolean
gst_ffmpegscale_get_unit_size (GstBaseTransform * trans, GstCaps * caps,
guint * size)
{
GstStructure *structure = gst_caps_get_structure (caps, 0);
gint width, height;
AVCodecContext *ctx;
if (!gst_structure_get_int (structure, "width", &width))
return FALSE;
if (!gst_structure_get_int (structure, "height", &height))
return FALSE;
ctx = avcodec_alloc_context ();
ctx->width = width;
ctx->height = height;
ctx->pix_fmt = AV_PIX_FMT_NB;
gst_ffmpeg_caps_with_codectype (CODEC_TYPE_VIDEO, caps, ctx);
if (ctx->pix_fmt == AV_PIX_FMT_NB) {
av_free (ctx);
return FALSE;
}
*size =
(guint) av_image_get_buffer_size (pix->pix_fmt, ctx->width, ctx->height,
1);
av_free (ctx);
return TRUE;
}
static gboolean
gst_ffmpegscale_set_caps (GstBaseTransform * trans, GstCaps * incaps,
GstCaps * outcaps)
{
GstFFMpegScale *scale = GST_FFMPEGSCALE (trans);
GstStructure *instructure = gst_caps_get_structure (incaps, 0);
GstStructure *outstructure = gst_caps_get_structure (outcaps, 0);
gint par_num, par_den;
AVCodecContext *ctx;
if (!gst_structure_get_int (instructure, "width", &scale->in_width))
return FALSE;
if (!gst_structure_get_int (instructure, "height", &scale->in_height))
return FALSE;
if (!gst_structure_get_int (outstructure, "width", &scale->out_width))
return FALSE;
if (!gst_structure_get_int (outstructure, "height", &scale->out_height))
return FALSE;
if (gst_structure_get_fraction (instructure, "pixel-aspect-ratio",
&par_num, &par_den)) {
gst_structure_set (outstructure,
"pixel-aspect-ratio", GST_TYPE_FRACTION,
par_num * scale->in_width / scale->out_width,
par_den * scale->in_height / scale->out_height, NULL);
}
ctx = avcodec_alloc_context ();
ctx->width = scale->in_width;
ctx->height = scale->in_height;
ctx->pix_fmt = AV_PIX_FMT_NB;
gst_ffmpeg_caps_with_codectype (CODEC_TYPE_VIDEO, incaps, ctx);
if (ctx->pix_fmt == AV_PIX_FMT_NB) {
av_free (ctx);
return FALSE;
}
scale->pixfmt = ctx->pix_fmt;
av_free (ctx);
scale->res = img_resample_init (scale->out_width, scale->out_height,
scale->in_width, scale->in_height);
return TRUE;
}
static GstFlowReturn
gst_ffmpegscale_transform (GstBaseTransform * trans, GstBuffer * inbuf,
GstBuffer * outbuf)
{
GstFFMpegScale *scale = GST_FFMPEGSCALE (trans);
AVPicture in_frame, out_frame;
gst_buffer_copy_metadata (outbuf, inbuf, GST_BUFFER_COPY_TIMESTAMPS);
gst_ffmpeg_avpicture_fill (&in_frame,
GST_BUFFER_DATA (inbuf),
scale->pixfmt, scale->in_width, scale->in_height);
gst_ffmpeg_avpicture_fill (&out_frame,
GST_BUFFER_DATA (outbuf),
scale->pixfmt, scale->out_width, scale->out_height);
img_resample (scale->res, &out_frame, &in_frame);
return GST_FLOW_OK;
}
static gboolean
gst_ffmpegscale_handle_src_event (GstPad * pad, GstEvent * event)
{
GstFFMpegScale *scale;
GstStructure *structure;
gdouble pointer;
gboolean res;
scale = GST_FFMPEGSCALE (gst_pad_get_parent (pad));
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", &pointer)) {
gst_structure_set (structure,
"pointer_x", G_TYPE_DOUBLE,
pointer * scale->in_width / scale->out_width, NULL);
}
if (gst_structure_get_double (structure, "pointer_y", &pointer)) {
gst_structure_set (structure,
"pointer_y", G_TYPE_DOUBLE,
pointer * scale->in_height / scale->out_height, NULL);
}
break;
default:
break;
}
res = gst_pad_event_default (pad, event);
gst_object_unref (scale);
return res;
}
gboolean
gst_ffmpegscale_register (GstPlugin * plugin)
{
return gst_element_register (plugin, "avvideoscale",
GST_RANK_NONE, GST_TYPE_FFMPEGSCALE);
}