gstreamer/sys/v4l2/gstv4l2mpeg2codec.c
Philipp Zabel 5c8d8723d2 v4l2: Add MPEG-2 profile and level support
Add support for V4L2 MPEG-2 decoders reporting supported profiles and
levels.
2019-09-27 08:47:20 +02:00

127 lines
3.8 KiB
C

/*
* Copyright (C) 2019 Philipp Zabel <philipp.zabel@gmail.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.
*
*/
#include "gstv4l2mpeg2codec.h"
#include <gst/gst.h>
#include "ext/v4l2-controls.h"
static gint
v4l2_profile_from_string (const gchar * profile)
{
gint v4l2_profile = -1;
if (g_str_equal (profile, "simple"))
v4l2_profile = V4L2_MPEG_VIDEO_MPEG2_PROFILE_SIMPLE;
else if (g_str_equal (profile, "main"))
v4l2_profile = V4L2_MPEG_VIDEO_MPEG2_PROFILE_MAIN;
else if (g_str_equal (profile, "snr"))
v4l2_profile = V4L2_MPEG_VIDEO_MPEG2_PROFILE_SNR_SCALABLE;
else if (g_str_equal (profile, "spatial"))
v4l2_profile = V4L2_MPEG_VIDEO_MPEG2_PROFILE_SPATIALLY_SCALABLE;
else if (g_str_equal (profile, "high"))
v4l2_profile = V4L2_MPEG_VIDEO_MPEG2_PROFILE_HIGH;
else if (g_str_equal (profile, "multiview"))
v4l2_profile = V4L2_MPEG_VIDEO_MPEG2_PROFILE_MULTIVIEW;
else
GST_WARNING ("Unsupported profile string '%s'", profile);
return v4l2_profile;
}
static const gchar *
v4l2_profile_to_string (gint v4l2_profile)
{
switch (v4l2_profile) {
case V4L2_MPEG_VIDEO_MPEG2_PROFILE_SIMPLE:
return "simple";
case V4L2_MPEG_VIDEO_MPEG2_PROFILE_MAIN:
return "main";
case V4L2_MPEG_VIDEO_MPEG2_PROFILE_SNR_SCALABLE:
return "snr";
case V4L2_MPEG_VIDEO_MPEG2_PROFILE_SPATIALLY_SCALABLE:
return "spatial";
case V4L2_MPEG_VIDEO_MPEG2_PROFILE_HIGH:
return "high";
case V4L2_MPEG_VIDEO_MPEG2_PROFILE_MULTIVIEW:
return "multiview";
default:
GST_WARNING ("Unsupported V4L2 profile %i", v4l2_profile);
break;
}
return NULL;
}
static gint
v4l2_level_from_string (const gchar * level)
{
gint v4l2_level = -1;
if (g_str_equal (level, "low"))
v4l2_level = V4L2_MPEG_VIDEO_MPEG2_LEVEL_LOW;
else if (g_str_equal (level, "main"))
v4l2_level = V4L2_MPEG_VIDEO_MPEG2_LEVEL_MAIN;
else if (g_str_equal (level, "high-1440"))
v4l2_level = V4L2_MPEG_VIDEO_MPEG2_LEVEL_HIGH_1440;
else if (g_str_equal (level, "high"))
v4l2_level = V4L2_MPEG_VIDEO_MPEG2_LEVEL_HIGH;
else
GST_WARNING ("Unsupported level '%s'", level);
return v4l2_level;
}
static const gchar *
v4l2_level_to_string (gint v4l2_level)
{
switch (v4l2_level) {
case V4L2_MPEG_VIDEO_MPEG2_LEVEL_LOW:
return "low";
case V4L2_MPEG_VIDEO_MPEG2_LEVEL_MAIN:
return "main";
case V4L2_MPEG_VIDEO_MPEG2_LEVEL_HIGH_1440:
return "high-1440";
case V4L2_MPEG_VIDEO_MPEG2_LEVEL_HIGH:
return "high";
default:
GST_WARNING ("Unsupported V4L2 level %i", v4l2_level);
break;
}
return NULL;
}
const GstV4l2Codec *
gst_v4l2_mpeg2_get_codec (void)
{
static GstV4l2Codec *codec = NULL;
if (g_once_init_enter (&codec)) {
static GstV4l2Codec c;
c.profile_cid = V4L2_CID_MPEG_VIDEO_MPEG2_PROFILE;
c.profile_to_string = v4l2_profile_to_string;
c.profile_from_string = v4l2_profile_from_string;
c.level_cid = V4L2_CID_MPEG_VIDEO_MPEG2_LEVEL;
c.level_to_string = v4l2_level_to_string;
c.level_from_string = v4l2_level_from_string;
g_once_init_leave (&codec, &c);
}
return codec;
}