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9dceb6ca52
This commits add common elements for Ancillary Data and Closed Caption support in GStreamer: * A VBI (Video Blanking Interval) parser that supports detection and extraction of Ancillary data according to the SMPTE S291M specification. Currently supports the v210 and UYVY video formats. * A new GstMeta for Closed Caption : GstVideoCaptionMeta. This supports the two types of CC : CEA-608 and CEA-708, along with the 4 different ways they can be transported (other systems are super-set of those). https://bugzilla.gnome.org/show_bug.cgi?id=794901
229 lines
7.4 KiB
C
229 lines
7.4 KiB
C
/* GStreamer
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* Copyright (C) <2018> Edward Hervey <edward@centricular.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_VIDEO_ANC_H__
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#define __GST_VIDEO_ANC_H__
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#include <gst/gst.h>
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#include <gst/video/video-format.h>
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#include <gst/video/video-info.h>
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G_BEGIN_DECLS
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typedef struct _GstVideoAncillary GstVideoAncillary;
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/**
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* GstVideoAncillary:
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* @DID: The Data Identifier
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* @SDID_block_number: The Secondary Data Identifier (if type 2) or the Data
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* Block Number (if type 2)
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* @data_count: The amount of data (in bytes) in @data (max 255 bytes)
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* @data: (array length=data_count): The user data content of the Ancillary packet.
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* Does not contain the ADF, DID, SDID nor CS.
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*
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* Video Ancillary data, according to SMPTE-291M specification.
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*
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* Note that the contents of the data are always stored as 8bit data (i.e. do not contain
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* the parity check bits).
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*
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* Since: 1.16
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*/
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struct _GstVideoAncillary {
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guint8 DID;
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guint8 SDID_block_number;
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guint8 data_count;
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guint8 data[256];
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/*< private >*/
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/* Padding for future extension */
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gpointer _gst_reserved[GST_PADDING];
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};
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typedef enum {
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GST_VIDEO_ANCILLARY_DID_UNDEFINED = 0x00,
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GST_VIDEO_ANCILLARY_DID_DELETION = 0x80,
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GST_VIDEO_ANCILLARY_DID_HANC_3G_AUDIO_DATA_FIRST = 0xa0,
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GST_VIDEO_ANCILLARY_DID_HANC_3G_AUDIO_DATA_LAST = 0xa7,
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GST_VIDEO_ANCILLARY_DID_HANC_HDTV_AUDIO_DATA_FIRST = 0xe0,
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GST_VIDEO_ANCILLARY_DID_HANC_HDTV_AUDIO_DATA_LAST = 0xe7,
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GST_VIDEO_ANCILLARY_DID_HANC_SDTV_AUDIO_DATA_1_FIRST = 0xec,
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GST_VIDEO_ANCILLARY_DID_HANC_SDTV_AUDIO_DATA_1_LAST = 0xef,
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GST_VIDEO_ANCILLARY_DID_CAMERA_POSITION = 0xf0,
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GST_VIDEO_ANCILLARY_DID_HANC_ERROR_DETECTION = 0xf4,
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GST_VIDEO_ANCILLARY_DID_HANC_SDTV_AUDIO_DATA_2_FIRST = 0xf8,
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GST_VIDEO_ANCILLARY_DID_HANC_SDTV_AUDIO_DATA_2_LAST = 0xff,
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} GstVideoAncillaryDID;
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/**
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* GST_VIDEO_ANCILLARY_DID16:
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* @anc: a #GstVideoAncillary
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*
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* Returns the #GstVideoAncillaryDID16 of the ancillary data.
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*
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* Since: 1.16
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*
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* Returns: a #GstVideoAncillaryDID16 identifier
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*/
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#define GST_VIDEO_ANCILLARY_DID16(anc) ((guint16)((anc)->DID) << 8 | (guint16)((anc)->SDID_block_number))
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/**
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* GstVideoAncillaryDID16:
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* @GST_VIDEO_ANCILLARY_DID16_S334_EIA_708: CEA 708 Ancillary data according to SMPTE 334
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* @GST_VIDEO_ANCILLARY_DID16_S334_EIA_608: CEA 608 Ancillary data according to SMPTE 334
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*
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* Some know types of Ancillary Data identifiers.
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*
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* Since: 1.16
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*/
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typedef enum {
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GST_VIDEO_ANCILLARY_DID16_S334_EIA_708 = 0x6101,
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GST_VIDEO_ANCILLARY_DID16_S334_EIA_608 = 0x6102,
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} GstVideoAncillaryDID16;
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/* Closed Caption support */
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/**
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* GstVideoCaptionType:
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* @GST_VIDEO_CAPTION_TYPE_UNKNOWN: Unknown type of CC
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* @GST_VIDEO_CAPTION_TYPE_CEA608_RAW: CEA-608 as byte pairs. Note that
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* this format is not recommended since is does not specify to
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* which field the caption comes from and therefore assumes
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* it comes from the first field (and that there is no information
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* on the second field). Use @@GST_VIDEO_CAPTION_TYPE_CEA608_IN_CEA708_RAW
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* if you wish to store CEA-608 from two fields.
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* @GST_VIDEO_CAPTION_TYPE_CEA608_IN_CEA708_RAW: CEA-608 as cc_data byte triplets.
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* The first byte of each triplet shall specify the field as in CEA-708
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* (i.e: 0xFC for the first field or 0xFD for the second field.). The 2nd
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* and 3rd byte of each triplet at the cc1 and cc2 bytes. Use this if
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* there is *only* CEA-608 caption. If there is also CEA-708 caption,
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* use @GST_VIDEO_CAPTION_TYPE_CEA708_RAW.
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* @GST_VIDEO_CAPTION_TYPE_CEA708_RAW: CEA-708 as cc_data byte triplets. They
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* can also contain 608-in-708.
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* @GST_VIDEO_CAPTION_TYPE_CEA708_CDP: CEA-708 (and optionally CEA-608) in
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* a CDP (Caption Distribution Packet) defined by SMPTE S-334-2.
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* Contains the whole CDP (starting with 0x9669).
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*
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* The various known types of Closed Caption (CC).
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*
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* Since: 1.16
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*/
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typedef enum {
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GST_VIDEO_CAPTION_TYPE_UNKNOWN = 0,
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GST_VIDEO_CAPTION_TYPE_CEA608_RAW = 1,
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GST_VIDEO_CAPTION_TYPE_CEA608_IN_CEA708_RAW = 2,
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GST_VIDEO_CAPTION_TYPE_CEA708_RAW = 3,
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GST_VIDEO_CAPTION_TYPE_CEA708_CDP = 4
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} GstVideoCaptionType;
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/**
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* GstVideoCaptionMeta:
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* @meta: parent #GstMeta
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* @caption_type: The type of Closed Caption contained in the meta.
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* @data: (array length=size): The Closed Caption data.
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* @size: The size in bytes of @data
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*
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* Extra buffer metadata providing Closed Caption.
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*
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* Since: 1.16
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*/
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typedef struct {
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GstMeta meta;
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GstVideoCaptionType caption_type;
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guint8 *data;
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gsize size;
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} GstVideoCaptionMeta;
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GST_VIDEO_API
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GType gst_video_caption_meta_api_get_type (void);
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#define GST_VIDEO_CAPTION_META_API_TYPE (gst_video_caption_meta_api_get_type())
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GST_VIDEO_API
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const GstMetaInfo *gst_video_caption_meta_get_info (void);
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#define GST_VIDEO_CAPTION_META_INFO (gst_video_caption_meta_get_info())
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/**
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* gst_buffer_get_video_caption_meta:
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* @b: A #GstBuffer
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*
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* Gets the #GstVideoCaptionMeta that might be present on @b.
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*
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* Since: 1.16
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*
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* Returns: The first #GstVideoCaptionMeta present on @b, or %NULL if
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* no #GstVideoCaptionMeta are present
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*/
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#define gst_buffer_get_video_caption_meta(b) \
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((GstVideoCaptionMeta*)gst_buffer_get_meta((b),GST_VIDEO_CAPTION_META_API_TYPE))
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GST_VIDEO_API
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GstVideoCaptionMeta *gst_buffer_add_video_caption_meta (GstBuffer * buffer,
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GstVideoCaptionType caption_type,
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const guint8 *data,
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gsize size);
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/**
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* GstVideoVBIParser:
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*
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* A parser for detecting and extracting @GstVideoAncillary data from
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* Vertical Blanking Interval lines of component signals.
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*
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* Since: 1.16
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*/
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typedef struct _GstVideoVBIParser GstVideoVBIParser;
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GST_VIDEO_API
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GType gst_video_vbi_parser_get_type (void);
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/**
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* GstVideoVBIParserResult:
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* @GST_VIDEO_VBI_PARSER_RESULT_DONE: No line were provided, or no more Ancillary data was found.
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* @GST_VIDEO_VBI_PARSER_RESULT_OK: A #GstVideoAncillary was found.
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* @GST_VIDEO_VBI_PARSER_RESULT_ERROR: An error occured
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*
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* Return values for #GstVideoVBIParser
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*
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* Since: 1.16
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*/
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typedef enum {
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GST_VIDEO_VBI_PARSER_RESULT_DONE = 0,
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GST_VIDEO_VBI_PARSER_RESULT_OK = 1,
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GST_VIDEO_VBI_PARSER_RESULT_ERROR = 2
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} GstVideoVBIParserResult;
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GST_VIDEO_API
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GstVideoVBIParserResult gst_video_vbi_parser_get_ancillary(GstVideoVBIParser *parser,
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GstVideoAncillary *anc);
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GST_VIDEO_API
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GstVideoVBIParser *gst_video_vbi_parser_new (GstVideoFormat format, guint32 pixel_width);
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GST_VIDEO_API
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GstVideoVBIParser *gst_video_vbi_parser_copy (const GstVideoVBIParser *parser);
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GST_VIDEO_API
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void gst_video_vbi_parser_free (GstVideoVBIParser *parser);
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GST_VIDEO_API
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void gst_video_vbi_parser_add_line (GstVideoVBIParser *parser, const guint8 *data);
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G_END_DECLS
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#endif /* __GST_VIDEO_ANC_H__ */
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