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The fake video decoder ignores input bitstream except to enforce caps restrictions. It reads video width, height and framerate from caps. Then it just pushes video frames without doing any decoding. The fake video decoder just draws a snake moving from left to right in the middle of the frame. This is a light weight drawing while it still provides an idea about how smooth is the rendering. The fake video decoder inherits from GstVideoDecoder. It is useful to measure how smooth will be the whole rendering pipeline if you had the most efficient video decoder. Also useful to bisect issues for example when suspecting issues in a specific video decoder. Handles mpeg2, mpeg4, h263, h264, theora, vp8, wmv3, msmpeg, flash-video, vp6, vp9, wmv1, wmv2, divx but more can be added if needed. For now it can only output RGBA, RGBx, BGRA, BGRx. Its rank is 0 (none) but I added a property to change it so that it can be selected by decodebin. gst-launch-1.0 fakevideodec rank=512 \ playbin uri=http://clips.vorwaerts-gmbh.de/big_buck_bunny.mp4 http://bugzilla.gnome.org/show_bug.cgi?id=723778 Closes #679 Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/5636>
68 lines
2 KiB
C
68 lines
2 KiB
C
/* GStreamer
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* Copyright (C) 2019 Julien Isorce <julien.isorce@gmail.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*
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*/
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#ifndef __GST_FAKE_VIDEO_DEC_H__
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#define __GST_FAKE_VIDEO_DEC_H__
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <gst/gst.h>
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#include <gst/video/gstvideodecoder.h>
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#include "gstdebugutilselements.h"
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G_BEGIN_DECLS
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#define GST_TYPE_FAKE_VIDEO_DEC \
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(gst_fake_video_dec_get_type())
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#define GST_FAKE_VIDEO_DEC(obj) \
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(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_FAKE_VIDEO_DEC,GstFakeVideoDec))
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#define GST_FAKE_VIDEO_DEC_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_FAKE_VIDEO_DEC,GstFakeVideoDecClass))
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#define GST_IS_FAKE_VIDEO_DEC(obj) \
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(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_FAKE_VIDEO_DEC))
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#define GST_IS_FAKE_VIDEO_DEC_CLASS(obj) \
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(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_FAKE_VIDEO_DEC))
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typedef struct _GstFakeVideoDec GstFakeVideoDec;
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typedef struct _GstFakeVideoDecClass GstFakeVideoDecClass;
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struct _GstFakeVideoDec
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{
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GstVideoDecoder base_video_decoder;
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GstVideoCodecState *input_state;
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GstVideoCodecState *output_state;
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guint min_buffers;
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guint snake_current_step;
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guint snake_max_steps;
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guint snake_length;
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};
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struct _GstFakeVideoDecClass
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{
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GstVideoDecoderClass base_video_decoder_class;
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};
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GType gst_fake_video_dec_get_type (void);
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G_END_DECLS
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#endif /* __GST_FAKE_VIDEO_DEC_H__ */
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