gstreamer/gst/videoparsers/gstvideoparseutils.h
2019-08-26 18:14:17 -04:00

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/* GStreamer
* Copyright (C) <2019> Aaron Boxer <aaron.boxer@collabora.com>
* Copyright (C) <2019> Collabora Ltd.
*
* 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.
*/
#ifndef __VIDEO_PARSE_UTILS_H__
#define __VIDEO_PARSE_UTILS_H__
#include <gst/gst.h>
#include <gst/base/gstbaseparse.h>
#include <gst/base/gstbytereader.h>
#include <gst/video/video-anc.h>
#define GST_VIDEO_BAR_MAX_BYTES 9
/* A53-4 Table 6.7 */
#define A53_USER_DATA_ID_GA94 0x47413934
#define A53_USER_DATA_ID_DTG1 0x44544731
/* custom id for SCTE 20 608 */
#define USER_DATA_ID_SCTE_20_CC 0xFFFFFFFE
/* custom id for DirecTV */
#define USER_DATA_ID_DIRECTV_CC 0xFFFFFFFF
/* A53-4 Table 6.9 */
#define A53_USER_DATA_TYPE_CODE_CC_DATA 0x03
#define A53_USER_DATA_TYPE_CODE_BAR_DATA 0x06
/* ANSI/SCTE 21 Additional EIA 608 Data
* https://www.scte.org/documents/pdf/Standards/ANSISCTE212001R2006.pdf*/
#define A53_USER_DATA_TYPE_CODE_SCTE_21_EIA_608_CC_DATA 0x04
/* CEA-708 Table 2 */
#define CEA_708_PROCESS_CC_DATA_FLAG 0x40
#define CEA_708_PROCESS_EM_DATA_FLAG 0x80
/* country codes */
#define ITU_T_T35_COUNTRY_CODE_US 0xB5
/* provider codes */
#define ITU_T_T35_MANUFACTURER_US_ATSC 0x31
#define ITU_T_T35_MANUFACTURER_US_DIRECTV 0x2F
/*
* GstVideoAFDAspectRatio:
* @GST_VIDEO_AFD_ASPECT_RATIO_UNDEFINED: aspect ratio is undefined
* @GST_VIDEO_AFD_ASPECT_RATIO_4_3: 4:3 aspect ratio
* @GST_VIDEO_AFD_ASPECT_RATIO_16_9: 16:9 aspect ratio
*
* Enumeration of the different AFD aspect ratios (SMPTE ST2016-1 only)
*/
typedef enum {
GST_VIDEO_AFD_ASPECT_RATIO_UNDEFINED,
GST_VIDEO_AFD_ASPECT_RATIO_4_3,
GST_VIDEO_AFD_ASPECT_RATIO_16_9
} GstVideoAFDAspectRatio;
/*
* GstVideoParseUtilsField:
* @GST_VIDEO_PARSE_UTILS_FIELD_1 progressive or field 1
* @GST_VIDEO_PARSE_UTILS_FIELD_2 field 2
*
* Enumeration of fields
*/
typedef enum {
GST_VIDEO_PARSE_UTILS_FIELD_1,
GST_VIDEO_PARSE_UTILS_FIELD_2
} GstVideoParseUtilsField;
/*
* GstVideoAFD:
* @field: #GstVideoParseUtilsField for @afd
* @aspect_ratio: #GstVideoAFDAspectRatio for frame
* @spec: #GstVideoAFDSpec that applies to @afd
* @afd: #GstVideoAFDValue AFD value
*
* Active Format Description (AFD)
*
* For details, see Table 6.14 Active Format in:
*
* ATSC Digital Television Standard:
* Part 4 MPEG-2 Video System Characteristics
*
* https://www.atsc.org/wp-content/uploads/2015/03/a_53-Part-4-2009.pdf
*
* and Active Format Description in Complete list of AFD codes
*
* https://en.wikipedia.org/wiki/Active_Format_Description#Complete_list_of_AFD_codes
*
* and SMPTE ST2016-1
*/
typedef struct {
GstVideoParseUtilsField field;
GstVideoAFDAspectRatio aspect_ratio;
GstVideoAFDSpec spec;
GstVideoAFDValue afd;
} GstVideoAFD;
/*
* GstVideoBarData:
* @field: GstVideoParseUtilsField for bar data
* @is_letterbox: if true then bar data specifies letterbox, otherwise pillarbox
* @bar_data: An array of size 2. if @is_letterbox is true, then two values specify
* last line of a horizontal letterbox bar area at top of reconstructed frame
* and first line of a horizontal letterbox bar area at bottom of reconstructed frame
* otherwise, two values specify
* last horizontal luminance sample of a vertical pillarbox bar area at the left side
* of the reconstructed frame, and first horizontal luminance sample of a vertical pillarbox
* bar area at the right side of the reconstructed frame
*
* Bar data should be included in video user data
* whenever the rectangular picture area containing useful information
* does not extend to the full height or width of the coded frame
* and AFD alone is insufficient to describe the extent of the image.
*
* Note: either vertical or horizontal bars are specified, but not both.
*
* For more details, see:
*
* https://www.atsc.org/wp-content/uploads/2015/03/a_53-Part-4-2009.pdf
*
* and SMPTE ST2016-1
*/
typedef struct {
GstVideoParseUtilsField field;
gboolean is_letterbox;
guint bar_data[2];
} GstVideoBarData;
/*
* GstVideoParseUserData
*
* Holds unparsed and parsed user data for closed captions, AFD and Bar data.
*/
typedef struct
{
GstVideoParseUtilsField field;
/* pending closed captions */
guint8 closedcaptions[96];
guint closedcaptions_size;
GstVideoCaptionType closedcaptions_type;
/* pending bar data */
guint8 bar_data[GST_VIDEO_BAR_MAX_BYTES];
guint bar_data_size;
gboolean has_bar_data;
/* parsed bar data */
GstVideoBarData bar_parsed;
/* pending AFD data */
guint8 afd;
gboolean active_format_flag;
GstVideoAFDSpec afd_spec;
gboolean has_afd;
/* parsed afd data */
GstVideoAFD afd_parsed;
} GstVideoParseUserData;
G_BEGIN_DECLS
void gst_video_parse_user_data(GstElement * elt, GstVideoParseUserData * user_data,
GstByteReader * br, guint8 field, guint16 provider_code);
void gst_video_push_user_data(GstElement * elt, GstVideoParseUserData * user_data,
GstBuffer * buf);
G_END_DECLS
#endif /* __VIDEO_PARSE_UTILS_H__ */