mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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videoparseutils: add new parser class
This commit is contained in:
Aaron Boxer
parent
d5fd9bc22b
commit
22ec7fbbc2
4 changed files with 617 additions and 2 deletions
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@ -8,7 +8,8 @@ libgstvideoparsersbad_la_SOURCES = plugin.c \
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gstjpeg2000parse.c \
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gstjpeg2000parse.c \
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gstpngparse.c \
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gstpngparse.c \
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gstvc1parse.c \
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gstvc1parse.c \
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gsth265parse.c
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gsth265parse.c \
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gstvideoparseutils.c
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libgstvideoparsersbad_la_CFLAGS = \
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libgstvideoparsersbad_la_CFLAGS = \
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$(GST_PLUGINS_BAD_CFLAGS) $(GST_PLUGINS_BASE_CFLAGS) \
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$(GST_PLUGINS_BAD_CFLAGS) $(GST_PLUGINS_BASE_CFLAGS) \
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@ -32,4 +33,5 @@ noinst_HEADERS = gsth263parse.h h263parse.h \
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gstjpeg2000parse.h \
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gstjpeg2000parse.h \
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gstpngparse.h \
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gstpngparse.h \
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gstvc1parse.h \
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gstvc1parse.h \
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gsth265parse.h
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gsth265parse.h \
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gstvideoparseutils.h
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426
gst/videoparsers/gstvideoparseutils.c
Normal file
426
gst/videoparsers/gstvideoparseutils.c
Normal file
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@ -0,0 +1,426 @@
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/* GStreamer
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* Copyright (2019) Collabora Ltd.
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* Contact: Aaron Boxer <aaron.boxer@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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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <string.h>
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#include <gst/base/base.h>
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#include <gst/pbutils/pbutils.h>
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#include <gst/video/video.h>
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#include <gst/base/gstbitreader.h>
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#include <gstvideoparseutils.h>
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static gboolean gst_video_parse_utils_parse_bar (const guint8 * data,
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gsize size, guint field, GstVideoBarData * bar);
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static gboolean gst_video_parse_utils_parse_afd (const guint8 data,
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GstVideoAFD * afd, GstVideoAFDSpec spec);
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/*
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* gst_video_parse_user_data:
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* @elt: #GstElement that is parsing user data
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* @user_data: #GstVideoParseUserData struct to hold parsed closed caption, bar and AFD data
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* @br: #GstByteReader attached to buffer of user data
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* @field: 0 for progressive or field 1 and 1 for field 2
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* @provider_code: Currently, only (US) ATSC and DirecTV provider codes are supported
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*
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* Parse user data and store in @user_data
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*/
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void
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gst_video_parse_user_data (GstElement * elt, GstVideoParseUserData * user_data,
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GstByteReader * br, guint8 field, guint16 provider_code)
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{
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guint32 user_data_id = 0;
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guint8 user_data_type_code = 0;
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gboolean a53_process_708_cc_data = FALSE;
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gboolean process_708_em_data = FALSE;
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guint8 temp = 0;
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guint8 cc_count;
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guint cc_size;
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guint bar_size = 0;
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const guint8 *data = NULL;
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guint8 directv_size = 0;
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/* https://en.wikipedia.org/wiki/CEA-708#Picture_User_Data */
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switch (provider_code) {
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case ITU_T_T35_MANUFACTURER_US_ATSC:
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if (!gst_byte_reader_peek_uint32_be (br, &user_data_id)) {
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GST_WARNING_OBJECT (elt, "Missing user data id, ignoring");
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return;
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}
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switch (user_data_id) {
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case A53_USER_DATA_ID_DTG1:
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case A53_USER_DATA_ID_GA94:
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/* ANSI/SCTE 128-2010a section 8.1.2 */
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if (!gst_byte_reader_get_uint32_be (br, &user_data_id)) {
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GST_WARNING_OBJECT (elt, "Missing user data id, ignoring");
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return;
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}
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break;
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default:
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/* check for SCTE 20 */
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if (user_data_id >> 24 == A53_USER_DATA_TYPE_CODE_CC_DATA) {
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user_data_id = USER_DATA_ID_SCTE_20_CC;
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gst_byte_reader_skip (br, 1);
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}
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break;
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}
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break;
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case ITU_T_T35_MANUFACTURER_US_DIRECTV:
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user_data_id = USER_DATA_ID_DIRECTV_CC;
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break;
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default:
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GST_LOG_OBJECT (elt, "Unsupported provider code %d", provider_code);
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return;
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}
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switch (user_data_id) {
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case USER_DATA_ID_SCTE_20_CC:
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GST_DEBUG_OBJECT (elt, "Unsupported SCTE 20 closed captions");
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break;
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case A53_USER_DATA_ID_DTG1:
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if (!gst_byte_reader_get_uint8 (br, &temp)) {
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GST_WARNING_OBJECT (elt, "Missing active format flag, ignoring");
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break;
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}
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/* check active format flag for presence of AFD */
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if (temp & 0x40) {
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if (!gst_byte_reader_get_uint8 (br, &temp)) {
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GST_WARNING_OBJECT (elt,
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"Missing active format description, ignoring");
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break;
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}
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temp = temp & 0xF;
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GST_LOG_OBJECT (elt, "parsed active format description (AFD): %d",
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temp);
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user_data->afd_spec = GST_VIDEO_AFD_SPEC_ATSC_A53;
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user_data->afd = temp;
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user_data->active_format_flag = TRUE;
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} else {
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user_data->active_format_flag = FALSE;
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}
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user_data->has_afd = TRUE;
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user_data->field = field;
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break;
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case USER_DATA_ID_DIRECTV_CC:
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case A53_USER_DATA_ID_GA94:
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if (!gst_byte_reader_get_uint8 (br, &user_data_type_code)) {
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GST_WARNING_OBJECT (elt, "Missing user data type code, ignoring");
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break;
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}
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if (provider_code == ITU_T_T35_MANUFACTURER_US_DIRECTV) {
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if (!gst_byte_reader_get_uint8 (br, &directv_size)) {
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GST_WARNING_OBJECT (elt, "Missing DirecTV size, ignoring");
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break;
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}
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}
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switch (user_data_type_code) {
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case A53_USER_DATA_TYPE_CODE_CC_DATA:
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if (gst_byte_reader_get_remaining (br) < 7) {
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GST_WARNING_OBJECT (elt,
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"Closed caption data packet too short, ignoring");
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break;
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}
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if (!gst_byte_reader_get_uint8 (br, &cc_count)) {
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GST_WARNING_OBJECT (elt, "Missing closed caption count, ignoring");
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break;
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}
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/* A53 part 4 closed captions */
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a53_process_708_cc_data =
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(cc_count & CEA_708_PROCESS_CC_DATA_FLAG) != 0;
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if (!a53_process_708_cc_data) {
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GST_WARNING_OBJECT (elt,
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"ignoring closed captions as CEA_708_PROCESS_CC_DATA_FLAG is not set");
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}
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process_708_em_data = (cc_count & CEA_708_PROCESS_EM_DATA_FLAG) != 0;
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if (!process_708_em_data) {
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GST_WARNING_OBJECT (elt,
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"CEA_708_PROCESS_EM_DATA_FLAG flag is not set");
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}
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if (!gst_byte_reader_get_uint8 (br, &temp)) {
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GST_WARNING_OBJECT (elt, "Missing em bits, ignoring");
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break;
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}
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if (temp != 0xff) {
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GST_WARNING_OBJECT (elt, "em data does not equal 0xFF");
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}
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process_708_em_data = process_708_em_data && (temp == 0xff);
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/* ignore process_708_em_data as there is content that doesn't follow spec for this field */
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if (a53_process_708_cc_data) {
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cc_count = cc_count & 0x1f;
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cc_size = cc_count * 3;
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if (cc_size == 0 || cc_size > gst_byte_reader_get_remaining (br)) {
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GST_DEBUG_OBJECT (elt,
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"ignoring closed captions, not enough data");
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break;
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}
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/* Shouldn't really happen so let's not go out of our way to handle it */
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if (user_data->closedcaptions_size > 0)
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GST_WARNING_OBJECT (elt, "unused pending closed captions!");
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g_assert (cc_size <= sizeof (user_data->closedcaptions));
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if (!gst_byte_reader_get_data (br, cc_size, &data))
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break;
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memcpy (user_data->closedcaptions, data, cc_size);
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user_data->closedcaptions_size = cc_size;
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user_data->closedcaptions_type = GST_VIDEO_CAPTION_TYPE_CEA708_RAW;
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user_data->field = field;
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GST_DEBUG_OBJECT (elt, "CEA-708 closed captions, %u bytes",
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cc_size);
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}
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break;
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case A53_USER_DATA_TYPE_CODE_SCTE_21_EIA_608_CC_DATA:
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GST_DEBUG_OBJECT (elt, "Unsupported SCTE 21 closed captions");
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break;
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case A53_USER_DATA_TYPE_CODE_BAR_DATA:
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bar_size = gst_byte_reader_get_remaining (br);
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if (bar_size == 0) {
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GST_WARNING_OBJECT (elt, "Bar data packet too short, ignoring");
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break;
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}
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if (bar_size > GST_VIDEO_BAR_MAX_BYTES) {
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GST_WARNING_OBJECT (elt,
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"Bar data packet of size %d is too long, ignoring", bar_size);
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break;
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}
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if (!gst_byte_reader_get_data (br, bar_size, &data))
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break;
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memcpy (user_data->bar_data, data, bar_size);
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user_data->bar_data_size = bar_size;
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user_data->has_bar_data = TRUE;
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user_data->field = field;
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break;
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default:
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GST_DEBUG_OBJECT (elt,
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"Unrecognized user data type code %d of size %d",
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user_data_type_code, gst_byte_reader_get_remaining (br));
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break;
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}
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break;
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default:
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GST_DEBUG_OBJECT (elt,
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"Unrecognized user data id %d of size %d", user_data_id,
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gst_byte_reader_get_remaining (br));
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break;
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}
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}
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/*
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* gst_video_push_user_data:
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* @elt: #GstElement that is pushing user data
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* @user_data: #GstVideoParseUserData holding parsed closed caption, bar and AFD data
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* @buf: #GstBuffer that receives the parsed data
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*
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* After user data has been parsed, add the data to @buf
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*/
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void
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gst_video_push_user_data (GstElement * elt, GstVideoParseUserData * user_data,
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GstBuffer * buf)
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{
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/* 1. handle closed captions */
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if (user_data->closedcaptions_size > 0) {
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gst_buffer_add_video_caption_meta (buf,
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user_data->closedcaptions_type, user_data->closedcaptions,
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user_data->closedcaptions_size);
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user_data->closedcaptions_type = GST_VIDEO_CAPTION_TYPE_UNKNOWN;
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user_data->closedcaptions_size = 0;
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}
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/* 2. handle AFD */
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if (user_data->has_afd) {
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GstVideoAFD afd;
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afd.field = 0;
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afd.aspect_ratio = GST_VIDEO_AFD_ASPECT_RATIO_UNDEFINED;
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afd.spec = GST_VIDEO_AFD_SPEC_ATSC_A53;
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afd.afd = GST_VIDEO_AFD_UNAVAILABLE;
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if (gst_video_parse_utils_parse_afd (user_data->afd, &afd, afd.spec)) {
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gst_buffer_add_video_afd_meta (buf, afd.field, afd.spec, afd.afd);
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} else {
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GST_WARNING_OBJECT (elt, "Invalid AFD value %d", user_data->afd);
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}
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} else if (user_data->active_format_flag) {
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/* AFD was present, but now it is no longer present */
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GST_DEBUG_OBJECT (elt,
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"AFD was present in previous frame, now no longer present");
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user_data->active_format_flag = 0;
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}
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user_data->has_afd = FALSE;
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/* 3. handle Bar data */
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if (user_data->has_bar_data) {
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GstVideoBarData data;
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if (gst_video_parse_utils_parse_bar (user_data->bar_data,
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user_data->bar_data_size, user_data->field, &data)) {
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gst_buffer_add_video_bar_meta (buf, data.field, data.is_letterbox,
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data.bar_data[0], data.bar_data[1]);
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} else {
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GST_WARNING_OBJECT (elt, "Invalid Bar data");
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}
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} else if (user_data->bar_data_size) {
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/* bar data was present, but now it is no longer present */
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GST_DEBUG_OBJECT (elt,
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"Bar data was present in previous frame, now no longer present");
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user_data->bar_data_size = 0;
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}
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user_data->has_bar_data = FALSE;
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}
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/*
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* gst_video_parse_utils_parse_bar:
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* @data: bar data array
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* @size:size of bar data array
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* @bar: #GstVideoBarData structure
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*
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* Parse bar data bytes into #GstVideoBarData structure
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*
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* See Table in https://www.atsc.org/wp-content/uploads/2015/03/a_53-Part-4-2009.pdf
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*
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* Returns: TRUE if parsing was successful, otherwise FALSE
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*/
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static gboolean
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gst_video_parse_utils_parse_bar (const guint8 * data, gsize size,
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guint field, GstVideoBarData * bar)
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{
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guint8 temp;
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int i = 0;
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guint8 bar_flags[4];
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guint16 bar_vals[4];
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GstBitReader bar_tender;
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/* there must be at least one byte, and not more than GST_VIDEO_BAR_MAX_BYTES bytes */
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if (!bar || size == 0 || size > GST_VIDEO_BAR_MAX_BYTES)
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return FALSE;
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||||||
|
gst_bit_reader_init (&bar_tender, data, size);
|
||||||
|
|
||||||
|
|
||||||
|
/* parse bar flags */
|
||||||
|
for (i = 0; i < 4; ++i) {
|
||||||
|
if (!gst_bit_reader_get_bits_uint8 (&bar_tender, bar_flags + i, 1))
|
||||||
|
return FALSE;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* the next four bits must equal 1111 */
|
||||||
|
if (!gst_bit_reader_get_bits_uint8 (&bar_tender, &temp, 4) || temp != 0xF)
|
||||||
|
return FALSE;
|
||||||
|
|
||||||
|
/* parse bar values */
|
||||||
|
for (i = 0; i < 4; ++i) {
|
||||||
|
if (bar_flags[i]) {
|
||||||
|
/* the next two bits must equal 11 */
|
||||||
|
if (!gst_bit_reader_get_bits_uint8 (&bar_tender, &temp, 2) || temp != 0x3)
|
||||||
|
return FALSE;
|
||||||
|
|
||||||
|
if (!gst_bit_reader_get_bits_uint16 (&bar_tender, bar_vals + i, 14))
|
||||||
|
return FALSE;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
/* bars are signaled in pairs: either top/bottom or left/right, but not both */
|
||||||
|
if ((bar_flags[0] != bar_flags[1]) || (bar_flags[2] != bar_flags[3]))
|
||||||
|
return FALSE;
|
||||||
|
if ((bar_flags[0] && bar_flags[1]) == (bar_flags[2] && bar_flags[3]))
|
||||||
|
return FALSE;
|
||||||
|
|
||||||
|
bar->is_letterbox = bar_flags[0] && bar_flags[1];
|
||||||
|
if (bar->is_letterbox) {
|
||||||
|
bar->bar_data[0] = bar_vals[0];
|
||||||
|
bar->bar_data[1] = bar_vals[1];
|
||||||
|
} else {
|
||||||
|
bar->bar_data[0] = bar_vals[2];
|
||||||
|
bar->bar_data[1] = bar_vals[3];
|
||||||
|
}
|
||||||
|
bar->field = field;
|
||||||
|
|
||||||
|
return TRUE;
|
||||||
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
* gst_video_parse_utils_parse_afd:
|
||||||
|
* @data: bar byte
|
||||||
|
* @afd: pointer to #GstVideoAFD struct
|
||||||
|
* @spec : #GstVideoAFDSpec indicating specification that applies to AFD byte
|
||||||
|
*
|
||||||
|
* Parse afd byte into #GstVideoAFD struct
|
||||||
|
*
|
||||||
|
* See:
|
||||||
|
*
|
||||||
|
* https://www.atsc.org/wp-content/uploads/2015/03/a_53-Part-4-2009.pdf
|
||||||
|
*
|
||||||
|
* https://en.wikipedia.org/wiki/Active_Format_Description#Complete_list_of_AFD_codes
|
||||||
|
*
|
||||||
|
* and
|
||||||
|
*
|
||||||
|
* SMPTE ST2016-1
|
||||||
|
*
|
||||||
|
* Returns: TRUE if parsing was successful, otherwise FALSE
|
||||||
|
*/
|
||||||
|
static gboolean
|
||||||
|
gst_video_parse_utils_parse_afd (const guint8 data, GstVideoAFD * afd,
|
||||||
|
GstVideoAFDSpec spec)
|
||||||
|
{
|
||||||
|
guint8 afd_data;
|
||||||
|
g_return_val_if_fail (afd != NULL, FALSE);
|
||||||
|
g_return_val_if_fail ((guint8) spec <= 2, FALSE);
|
||||||
|
switch (spec) {
|
||||||
|
case GST_VIDEO_AFD_SPEC_DVB_ETSI:
|
||||||
|
case GST_VIDEO_AFD_SPEC_ATSC_A53:
|
||||||
|
if ((data & 0x40) == 0)
|
||||||
|
return FALSE;
|
||||||
|
afd_data = data & 0xF;
|
||||||
|
break;
|
||||||
|
case GST_VIDEO_AFD_SPEC_SMPTE_ST2016_1:
|
||||||
|
if ((data & 0x80) || (data & 0x3))
|
||||||
|
return FALSE;
|
||||||
|
afd_data = data >> 3;
|
||||||
|
afd->aspect_ratio = (GstVideoAFDAspectRatio) (((data >> 2) & 1) + 1);
|
||||||
|
break;
|
||||||
|
default:
|
||||||
|
return FALSE;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* AFD is stored in a nybble */
|
||||||
|
g_return_val_if_fail (afd_data <= 0xF, FALSE);
|
||||||
|
/* reserved values for all specifications */
|
||||||
|
g_return_val_if_fail (afd_data != 1 && (afd_data < 5 || afd_data > 7)
|
||||||
|
&& afd_data != 12, FALSE);
|
||||||
|
/* reserved for DVB/ETSI */
|
||||||
|
g_return_val_if_fail ((spec != GST_VIDEO_AFD_SPEC_DVB_ETSI)
|
||||||
|
|| (afd_data != 0), FALSE);
|
||||||
|
|
||||||
|
afd->spec = spec;
|
||||||
|
afd->afd = (GstVideoAFDValue) afd_data;
|
||||||
|
return TRUE;
|
||||||
|
}
|
||||||
186
gst/videoparsers/gstvideoparseutils.h
Normal file
186
gst/videoparsers/gstvideoparseutils.h
Normal file
|
|
@ -0,0 +1,186 @@
|
||||||
|
/* 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__ */
|
||||||
|
|
@ -10,6 +10,7 @@ vparse_sources = [
|
||||||
'gstpngparse.c',
|
'gstpngparse.c',
|
||||||
'gstvc1parse.c',
|
'gstvc1parse.c',
|
||||||
'gsth265parse.c',
|
'gsth265parse.c',
|
||||||
|
'gstvideoparseutils.c',
|
||||||
'gstjpeg2000parse.c',
|
'gstjpeg2000parse.c',
|
||||||
]
|
]
|
||||||
|
|
||||||
|
|
|
||||||
Loading…
Reference in a new issue