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e6d83d8f96
The libjpeg-turbo has a built-in support for performing colorspace
conversion. The performance of this conversion is much better than
doing the same separately using videoconvert. Implement support for
this conversion to RGBx/xRGB/BGRx/xBGR formats. Other formats can
be easily added later.
- The decoding of various pixel formats can be tested and compared to
non-libjpeg-turbo decoding as follows:
for gfmt in {RGB,BGR}{,x} x{RGB,BGR} ; do
echo "$gfmt"
gst-launch-1.0 -q \
videotestsrc pattern=colors ! \
video/x-raw,format=${gfmt} ! \
fakesink dump=true | \
head -n 200 | tail -n 1
gst-launch-1.0 -q --gst-plugin-path=build/ext/jpeg/ \
videotestsrc pattern=colors ! \
video/x-raw,format=${gfmt} ! \
jpegenc ! \
jpegdec ! \
video/x-raw,format=${gfmt} ! \
fakesink dump=true | \
head -n 200 | tail -n 1
done
Result looks as follows, i.e. comparable:
RGB
00000c70 (0x7f7736fbdd10): 05 33 19 05 33 26 05 33 33 05 33 40 05 33 4c 05 .3..3&.33.3@.3L.
00000c70 (0x7f389e8f7d10): 05 32 17 04 32 22 04 32 31 04 32 3e 04 32 4a 04 .2..2".21.2>.2J.
RGBx
00000c70 (0x7f79efd0ad10): cc 07 22 ff d9 07 22 ff e6 07 22 ff f3 07 22 ff .."..."..."...".
00000c70 (0x7fb6989f3d10): cd 06 22 00 d9 06 22 00 e6 06 22 00 f4 06 22 00 .."..."..."...".
BGR
00000c70 (0x7fa0a6c42d10): 05 0c 33 05 19 33 05 26 33 05 33 33 05 40 33 05 ..3..3.&3.33.@3.
00000c70 (0x7fc74165fd10): 05 08 32 04 17 32 04 22 32 04 31 32 04 3e 32 04 ..2..2."2.12.>2.
BGRx
00000c70 (0x7fbf399f1d10): 22 07 cc ff 22 07 d9 ff 22 07 e6 ff 22 07 f3 ff "..."..."..."...
00000c70 (0x7f50e3d1cd10): 22 06 cd 00 22 06 d9 00 22 06 e6 00 22 06 f4 00 "..."..."..."...
xRGB
00000c70 (0x7f0b950a2d10): ff cc 07 22 ff d9 07 22 ff e6 07 22 ff f3 07 22 ..."..."..."..."
00000c70 (0x7f4416b8dd10): 00 cd 06 22 00 d9 06 22 00 e6 06 22 00 f4 06 22 ..."..."..."..."
xBGR
00000c70 (0x7f237d74dd10): ff 22 07 cc ff 22 07 d9 ff 22 07 e6 ff 22 07 f3 ."..."..."..."..
00000c70 (0x7f095547dd10): 00 22 06 cd 00 22 06 d9 00 22 06 e6 00 22 06 f4 ."..."..."..."..
^^ ^^ ^^ ^^
Notice how the alpha channel is set to arbitrary value in case of the
libjpeg-turbo decoding into RGBx/BGRx/xRGB/xBGR pixel formats. This is
documented in libjpeg-turbo README.md as follows:
"
When using the RGBX, BGRX, XBGR, and XRGB colorspaces during decompression, the
X byte is undefined, and in order to ensure the best performance, libjpeg-turbo
can set that byte to whatever value it wishes.
"
- The interlaced num_fields=2 mjpeg stream can be generated and
tested as follows (this does require mjpegtools):
$ gst-launch-1.0 videotestsrc num-buffers=10 ! jpegenc ! multifilesink location=in%04d.jpg
$ jpeg2yuv -f 25 -I t -L 0 -j in%04d.jpg | yuv2lav -f avi -o result.avi
...
$ gst-launch-1.0 --gst-plugin-path=build/ext/jpeg/ filesrc location=result.avi ! \
avidemux ! jpegdec ! video/x-raw,format=RGBx ! videoconvert ! autovideosink
Signed-off-by: Marek Vasut <marex@denx.de>
Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/1091>
118 lines
3.2 KiB
C
118 lines
3.2 KiB
C
/* GStreamer
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* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
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* Copyright (C) 2012 Collabora Ltd.
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* Author : Edward Hervey <edward@collabora.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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#ifndef __GST_JPEG_DEC_H__
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#define __GST_JPEG_DEC_H__
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#include <setjmp.h>
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#include <gst/gst.h>
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#include <gst/video/video.h>
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#include <gst/video/gstvideodecoder.h>
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#include <gst/base/gstadapter.h>
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/* this is a hack hack hack to get around jpeglib header bugs... */
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#ifdef HAVE_STDLIB_H
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# undef HAVE_STDLIB_H
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#endif
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#include <stdio.h>
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#include <jpeglib.h>
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G_BEGIN_DECLS
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#define GST_TYPE_JPEG_DEC \
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(gst_jpeg_dec_get_type())
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#define GST_JPEG_DEC(obj) \
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(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_JPEG_DEC,GstJpegDec))
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#define GST_JPEG_DEC_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_JPEG_DEC,GstJpegDecClass))
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#define GST_IS_JPEG_DEC(obj) \
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(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_JPEG_DEC))
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#define GST_IS_JPEG_DEC_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_JPEG_DEC))
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typedef struct _GstJpegDec GstJpegDec;
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typedef struct _GstJpegDecClass GstJpegDecClass;
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struct GstJpegDecErrorMgr {
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struct jpeg_error_mgr pub; /* public fields */
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jmp_buf setjmp_buffer;
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};
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struct GstJpegDecSourceMgr {
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struct jpeg_source_mgr pub; /* public fields */
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GstJpegDec *dec;
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};
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/* Can't use GstBaseTransform, because GstBaseTransform
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* doesn't handle the N buffers in, 1 buffer out case,
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* but only the 1-in 1-out case */
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struct _GstJpegDec {
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GstVideoDecoder decoder;
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/* negotiated state */
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GstVideoCodecState *input_state;
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GstVideoCodecFrame *current_frame;
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GstMapInfo current_frame_map;
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/* libjpeg-turbo colorspace conversion */
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#ifdef JCS_EXTENSIONS
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GstVideoFormat format;
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J_COLOR_SPACE libjpeg_ext_format;
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gboolean format_convert;
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#endif
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/* parse state */
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gboolean saw_header;
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gint parse_entropy_len;
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gint parse_resync;
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/* properties */
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gint idct_method;
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gint max_errors; /* ATOMIC */
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struct jpeg_decompress_struct cinfo;
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struct GstJpegDecErrorMgr jerr;
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struct GstJpegDecSourceMgr jsrc;
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/* arrays for indirect decoding */
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gboolean idr_width_allocated;
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guchar *idr_y[16],*idr_u[16],*idr_v[16];
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/* scratch buffer for direct decoding overflow */
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guchar *scratch;
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guint scratch_size;
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/* current (parsed) image size */
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guint rem_img_len;
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};
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struct _GstJpegDecClass {
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GstVideoDecoderClass decoder_class;
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};
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GType gst_jpeg_dec_get_type(void);
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G_END_DECLS
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#endif /* __GST_JPEG_DEC_H__ */
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