gstreamer/subprojects/gst-plugins-bad/gst-libs/gst/codecs/gstmpeg2picture.c

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/* GStreamer
* Copyright (C) 2020 Intel Corporation
* Author: He Junyan <junyan.he@intel.com>
*
* 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 "gstmpeg2picture.h"
#include "gstcodecpicture-private.h"
GST_DEBUG_CATEGORY_EXTERN (gst_mpeg2_decoder_debug);
#define GST_CAT_DEFAULT gst_mpeg2_decoder_debug
GST_DEFINE_MINI_OBJECT_TYPE (GstMpeg2Picture, gst_mpeg2_picture);
static void
_gst_mpeg2_picture_free (GstMpeg2Picture * picture)
{
GST_TRACE ("Free picture %p", picture);
if (picture->first_field)
gst_mpeg2_picture_unref (picture->first_field);
gst_codec_picture_free (GST_CODEC_PICTURE (picture));
}
/**
* gst_mpeg2_picture_new:
*
* Create new #GstMpeg2Picture
*
* Returns: a new #GstMpeg2Picture
*
* Since: 1.20
*/
GstMpeg2Picture *
gst_mpeg2_picture_new (void)
{
GstMpeg2Picture *pic;
pic = g_new0 (GstMpeg2Picture, 1);
pic->pic_order_cnt = G_MAXINT32;
pic->structure = GST_MPEG_VIDEO_PICTURE_STRUCTURE_FRAME;
gst_mini_object_init (GST_MINI_OBJECT_CAST (pic), 0,
GST_TYPE_MPEG2_PICTURE, NULL, NULL,
(GstMiniObjectFreeFunction) _gst_mpeg2_picture_free);
GST_TRACE ("New picture %p", pic);
return pic;
}
struct _GstMpeg2Dpb
{
GstMpeg2Picture *ref_pic_list[2];
guint num_ref_pictures;
/* last added picture */
GstMpeg2Picture *new_pic;
};
/**
* gst_mpeg2_dpb_new: (skip)
*
* Create new #GstMpeg2Dpb
*
* Returns: a new #GstMpeg2Dpb
*
* Since: 1.20
*/
GstMpeg2Dpb *
gst_mpeg2_dpb_new (void)
{
return g_new0 (GstMpeg2Dpb, 1);
}
/**
* gst_mpeg2_dpb_free:
* @dpb: a #GstMpeg2Dpb to free
*
* Free the @dpb
*
* Since: 1.20
*/
void
gst_mpeg2_dpb_free (GstMpeg2Dpb * dpb)
{
guint i;
g_return_if_fail (dpb != NULL);
gst_clear_mpeg2_picture (&dpb->new_pic);
g_assert (dpb->num_ref_pictures <= 2);
for (i = 0; i < dpb->num_ref_pictures; i++)
gst_clear_mpeg2_picture (&dpb->ref_pic_list[i]);
g_free (dpb);
}
/**
* gst_mpeg2_dpb_clear:
* @dpb: a #GstMpeg2Dpb
*
* Clear all stored #GstMpeg2Picture
*
* Since: 1.20
*/
void
gst_mpeg2_dpb_clear (GstMpeg2Dpb * dpb)
{
guint i;
g_return_if_fail (dpb != NULL);
gst_clear_mpeg2_picture (&dpb->new_pic);
g_assert (dpb->num_ref_pictures <= 2);
for (i = 0; i < dpb->num_ref_pictures; i++)
gst_clear_mpeg2_picture (&dpb->ref_pic_list[i]);
dpb->num_ref_pictures = 0;
}
static void
_dpb_add_to_reference (GstMpeg2Dpb * dpb, GstMpeg2Picture * pic)
{
gint index = -1;
if (G_LIKELY (dpb->num_ref_pictures == 2)) {
index = (dpb->ref_pic_list[0]->pic_order_cnt >
dpb->ref_pic_list[1]->pic_order_cnt);
if (dpb->ref_pic_list[index]->pic_order_cnt > pic->pic_order_cnt)
return;
}
if (index < 0) {
index = dpb->num_ref_pictures;
dpb->num_ref_pictures++;
}
gst_mpeg2_picture_replace (&dpb->ref_pic_list[index], pic);
}
/**
* gst_mpeg2_dpb_add:
* @dpb: a #GstMpeg2Dpb
* @picture: (transfer full): a #GstMpeg2Picture
*
* Store the @picture
*
* Since: 1.20
*/
void
gst_mpeg2_dpb_add (GstMpeg2Dpb * dpb, GstMpeg2Picture * picture)
{
g_return_if_fail (dpb != NULL);
g_return_if_fail (GST_IS_MPEG2_PICTURE (picture));
g_assert (dpb->num_ref_pictures <= 2);
if (!GST_MPEG2_PICTURE_IS_REF (picture) || dpb->num_ref_pictures == 2) {
gst_mpeg2_picture_replace (&dpb->new_pic, picture);
} else {
_dpb_add_to_reference (dpb, picture);
}
}
/**
* gst_mpeg2_dpb_need_bump:
* @dpb: a #GstMpeg2Dpb
*
* Checks if @dbp has a new picture.
*
* Returns: #TRUE if @dpb needs to be bumped; otherwise, #FALSE
*
* Since: 1.20
*/
gboolean
gst_mpeg2_dpb_need_bump (GstMpeg2Dpb * dpb)
{
g_return_val_if_fail (dpb != NULL, FALSE);
g_assert (dpb->num_ref_pictures <= 2);
if (dpb->new_pic)
return TRUE;
return FALSE;
}
/**
* gst_mpeg2_dpb_bump:
* @dpb: a #GstMpeg2Dpb
*
* Returns: (nullable) (transfer full): a #GstMpeg2Picture which is needed to be
* outputted
*
* Since: 1.20
*/
GstMpeg2Picture *
gst_mpeg2_dpb_bump (GstMpeg2Dpb * dpb)
{
GstMpeg2Picture *pic = NULL;
guint i;
g_return_val_if_fail (dpb != NULL, FALSE);
g_assert (dpb->num_ref_pictures <= 2);
/* First, find the lowest poc. */
for (i = 0; i < 2; i++) {
if (!dpb->ref_pic_list[i])
continue;
if (dpb->ref_pic_list[i]->needed_for_output) {
if (!pic || pic->pic_order_cnt > dpb->ref_pic_list[i]->pic_order_cnt)
gst_mpeg2_picture_replace (&pic, dpb->ref_pic_list[i]);
}
}
if (dpb->new_pic && dpb->new_pic->needed_for_output &&
(!pic || pic->pic_order_cnt > dpb->new_pic->pic_order_cnt))
gst_mpeg2_picture_replace (&pic, dpb->new_pic);
/* Then, replace the reference if needed. */
if (dpb->new_pic && GST_MPEG2_PICTURE_IS_REF (dpb->new_pic)) {
_dpb_add_to_reference (dpb, dpb->new_pic);
gst_clear_mpeg2_picture (&dpb->new_pic);
}
if (pic) {
pic->needed_for_output = FALSE;
if (pic == dpb->new_pic)
gst_clear_mpeg2_picture (&dpb->new_pic);
}
return pic;
}
/**
* gst_mpeg2_dpb_get_neighbours:
* @dpb: a #GstMpeg2Dpb
* @picture: current #GstMpeg2Picture
* @prev_picture_ptr: (transfer none) (out) (nullable): previuous
* #GstMpeg2Picture in @dpb
* @next_picture_ptr: (transfer none) (out) (nullable): next
* #GstMpeg2Picture in @dpb
*
* Gets the neighbours #GstMpeg2Picture of @picture in @dpb.
*
* Since: 1.20
*/
void
gst_mpeg2_dpb_get_neighbours (GstMpeg2Dpb * dpb,
GstMpeg2Picture * picture, GstMpeg2Picture ** prev_picture_ptr,
GstMpeg2Picture ** next_picture_ptr)
{
GstMpeg2Picture *ref_picture, *ref_pictures[2];
GstMpeg2Picture **picture_ptr;
guint i, index;
g_return_if_fail (dpb != NULL);
g_return_if_fail (picture != NULL);
g_assert (dpb->num_ref_pictures <= 2);
ref_pictures[0] = NULL;
ref_pictures[1] = NULL;
for (i = 0; i < 2; i++) {
ref_picture = dpb->ref_pic_list[i];
if (!ref_picture)
continue;
index = ref_picture->pic_order_cnt > picture->pic_order_cnt;
picture_ptr = &ref_pictures[index];
if (!*picture_ptr ||
((*picture_ptr)->pic_order_cnt > ref_picture->pic_order_cnt) == index)
*picture_ptr = ref_picture;
}
if (prev_picture_ptr)
*prev_picture_ptr = ref_pictures[0];
if (next_picture_ptr)
*next_picture_ptr = ref_pictures[1];
}