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gstreamer-plugins-base
MR-221-video-anc-add-two-new-CEA-608-caption-fo...
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File MR-221-video-anc-add-two-new-CEA-608-caption-formats.patch of Package gstreamer-plugins-base
https://gitlab.freedesktop.org/gstreamer/gst-plugins-base/-/merge_requests/221 Index: gst-plugins-base-1.22.0/gst-libs/gst/video/video-anc.c =================================================================== --- gst-plugins-base-1.22.0.orig/gst-libs/gst/video/video-anc.c +++ gst-plugins-base-1.22.0/gst-libs/gst/video/video-anc.c @@ -1017,6 +1017,8 @@ gst_buffer_add_video_caption_meta (GstBu switch (caption_type) { case GST_VIDEO_CAPTION_TYPE_CEA608_RAW: case GST_VIDEO_CAPTION_TYPE_CEA608_S334_1A: + case GST_VIDEO_CAPTION_TYPE_CEA608_SCTE_20: + case GST_VIDEO_CAPTION_TYPE_CEA608_ADDITIONAL_CEA_608: case GST_VIDEO_CAPTION_TYPE_CEA708_RAW: case GST_VIDEO_CAPTION_TYPE_CEA708_CDP: break; @@ -1066,6 +1068,10 @@ gst_video_caption_type_from_caps (const return GST_VIDEO_CAPTION_TYPE_CEA608_RAW; } else if (g_strcmp0 (format, "s334-1a") == 0) { return GST_VIDEO_CAPTION_TYPE_CEA608_S334_1A; + } else if (g_strcmp0 (format, "scte-20") == 0) { + return GST_VIDEO_CAPTION_TYPE_CEA608_SCTE_20; + } else if (g_strcmp0 (format, "additional-cea-608") == 0) { + return GST_VIDEO_CAPTION_TYPE_CEA608_ADDITIONAL_CEA_608; } } else if (gst_structure_has_name (s, "closedcaption/x-cea-708")) { if (g_strcmp0 (format, "cc_data") == 0) { @@ -1103,6 +1109,14 @@ gst_video_caption_type_to_caps (GstVideo caption_caps = gst_caps_new_simple ("closedcaption/x-cea-608", "format", G_TYPE_STRING, "s334-1a", NULL); break; + case GST_VIDEO_CAPTION_TYPE_CEA608_SCTE_20: + caption_caps = gst_caps_new_simple ("closedcaption/x-cea-608", + "format", G_TYPE_STRING, "scte-20", NULL); + break; + case GST_VIDEO_CAPTION_TYPE_CEA608_ADDITIONAL_CEA_608: + caption_caps = gst_caps_new_simple ("closedcaption/x-cea-608", + "format", G_TYPE_STRING, "additional-cea-608", NULL); + break; case GST_VIDEO_CAPTION_TYPE_CEA708_RAW: caption_caps = gst_caps_new_simple ("closedcaption/x-cea-708", "format", G_TYPE_STRING, "cc_data", NULL); Index: gst-plugins-base-1.22.0/gst-libs/gst/video/video-anc.h =================================================================== --- gst-plugins-base-1.22.0.orig/gst-libs/gst/video/video-anc.h +++ gst-plugins-base-1.22.0/gst-libs/gst/video/video-anc.h @@ -345,7 +345,53 @@ GstVideoBarMeta *gst_buffer_add_video_ba * offset relative to the base-line of the original image format (line 9 * for 525-line field 1, line 272 for 525-line field 2, line 5 for * 625-line field 1 and line 318 for 625-line field 2). - * @GST_VIDEO_CAPTION_TYPE_CEA708_RAW: CEA-708 as cc_data byte triplets. They + * @GST_VIDEO_CAPTION_TYPE_CEA608_SCTE_20: CEA 608 closed caption data as defined in + * ANSI/SCTE 20 + * https://www.scte.org/documents/pdf/standards/SCTE%2020%202012.pdf + * Section 5.5 + * This format is used for the carriage of CEA 608 closed caption data + * originating in Vertical Blanking Interval (VBI) service, and transported + * in MPEG-2 compliant bitstreams. + * The first byte must equal 1000 0001 to indicate valid data. + * The next five bits specify the number of CEA 608 closed caption triplets, + * followed by the sequence of triplets, laid out as follows for each triplet: + * cc priority : 2 bits + * field number: 2 bits + * line offset: 5 bits + * cc data 1: 8 bits + * cc data 2: 8 bits + * Notes: + * cc_priority is a number between 0 and 3 indicating the priority of constructs + * in picture reconstruction where different levels of hardware capability exist + * field number specifies the number of the field, in display order, from which + * the VBI data originated, specified as follows: + * 00 Forbidden + * 01 1st display field + * 10 2nd display field + * 11 3rd display field (the repeated field in film mode). + * line offset is a five-bit integer giving the offset in lines from which + * the VBI data originated, relative to the base VBI frame line + * (line 10 of NTSC field 1, line 273 of NTSC field 2, line 6 of PAL field 1, + * and line 319 of PAL field 2). + * @GST_VIDEO_CAPTION_TYPE_CEA608_ADDITIONAL_CEA_608: CEA-608 byte triplets as defined + * in ANSI/SCTE 21 + * 6.4 Additional CEA-608 Data + * https://www.scte.org/documents/pdf/Standards/ANSI_SCTE%2021%202012.pdf. + * This format, also known as telecine, is used for the carriage of CEA 608 + * closed caption data originating in Vertical Blanking Interval (VBI) service, + * and transported over cable digital transport streams. + * The second and third byte of the byte triplet + * is the raw CEA608 data, the first byte is a bitfield: The top/7th bit must + * equal 1 to indicate a valid triplet. Bits 6-2 represent the + * line offset relative to the base-line of the original image format (line 9 + * for 525-line field 1, line 272 for 525-line field 2, line 5 for + * 625-line field 1 and line 318 for 625-line field 2). + * Bits 1-0 represent the field number, as follows: + * 00 Forbidden + * 01 1st display field + * 10 2nd display field + * 11 3rd display field (the repeated field in film mode). + * @GST_VIDEO_CAPTION_TYPE_CEA708_RAW: CEA-708 as cc_data byte triplets. They * can also contain 608-in-708 and the first byte of each triplet has to * be inspected for detecting the type. * @GST_VIDEO_CAPTION_TYPE_CEA708_CDP: CEA-708 (and optionally CEA-608) in @@ -361,7 +407,9 @@ typedef enum { GST_VIDEO_CAPTION_TYPE_CEA608_RAW = 1, GST_VIDEO_CAPTION_TYPE_CEA608_S334_1A = 2, GST_VIDEO_CAPTION_TYPE_CEA708_RAW = 3, - GST_VIDEO_CAPTION_TYPE_CEA708_CDP = 4 + GST_VIDEO_CAPTION_TYPE_CEA708_CDP = 4, + GST_VIDEO_CAPTION_TYPE_CEA608_SCTE_20 = 5, + GST_VIDEO_CAPTION_TYPE_CEA608_ADDITIONAL_CEA_608 = 6 } GstVideoCaptionType; GST_VIDEO_API
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