mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-12-04 15:36:35 +00:00
9426eaae6a
We already did this for captions. We also need to do it for the other meta types to ensure our parsers are idempotent and don't attach duplicates. Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/5450>
554 lines
18 KiB
C
554 lines
18 KiB
C
/* 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/video/video-sei.h>
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#include <gst/base/gstbitreader.h>
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#include <gstvideoparseutils.h>
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GST_DEBUG_CATEGORY_EXTERN (videoparseutils_debug);
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#define GST_CAT_DEFAULT videoparseutils_debug
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static gboolean gst_video_parse_utils_parse_bar (const guint8 * data,
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gsize size, GstVideoParseUtilsField field, GstVideoBarData * bar);
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static gboolean gst_video_parse_utils_parse_afd (const guint8 data,
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GstVideoAFDSpec spec, GstVideoParseUtilsField field, GstVideoAFD * afd);
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static void gst_video_clear_unregistered_message
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(GstVideoUnregisteredMessage * msg);
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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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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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}
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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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/* 1 (cc count byte) +
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* 1 (reserved byte, 0xff) +
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* 1 (marker_bits, 0xff)
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*/
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if (gst_byte_reader_get_remaining (br) < 3) {
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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->field = field;
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GST_DEBUG_OBJECT (elt, "Bar data, %u bytes", bar_size);
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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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GstVideoAFD afd;
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GstVideoBarData bar;
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if (user_data->closedcaptions_size == 0) {
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GST_TRACE_OBJECT (elt, "No closed caption data to attach");
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} else if (gst_buffer_get_meta (buf, GST_VIDEO_CAPTION_META_API_TYPE)) {
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GST_DEBUG_OBJECT (elt, "Buffer already has closed caption meta");
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} else {
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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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}
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if (!user_data->active_format_flag) {
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GST_TRACE_OBJECT (elt, "No AFD to attach");
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} else if (gst_buffer_get_meta (buf, GST_VIDEO_AFD_META_API_TYPE)) {
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GST_DEBUG_OBJECT (elt, "Buffer already has AFD meta");
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} else if (!gst_video_parse_utils_parse_afd (user_data->afd,
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user_data->afd_spec, user_data->field, &afd)) {
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GST_WARNING_OBJECT (elt, "Invalid AFD value %d", user_data->afd);
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} else {
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gst_buffer_add_video_afd_meta (buf, afd.field, afd.spec, afd.afd);
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}
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if (!user_data->bar_data_size) {
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GST_TRACE_OBJECT (elt, "No Bar data to attach");
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} else if (gst_buffer_get_meta (buf, GST_VIDEO_BAR_META_API_TYPE)) {
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GST_DEBUG_OBJECT (elt, "Buffer already has Bar meta");
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} else if (!gst_video_parse_utils_parse_bar (user_data->bar_data,
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user_data->bar_data_size, user_data->field, &bar)) {
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GST_WARNING_OBJECT (elt, "Invalid Bar data");
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} else {
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gst_buffer_add_video_bar_meta (buf, bar.field, bar.is_letterbox,
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bar.bar_data[0], bar.bar_data[1]);
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}
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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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* @field: #GstVideoParseUtilsField we're parsing for
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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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GstVideoParseUtilsField 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] = { 0, 0, 0, 0 };
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GstBitReader bar_tender;
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g_return_val_if_fail (bar != NULL, FALSE);
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if (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);
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/* parse bar flags */
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for (i = 0; i < 4; ++i) {
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if (!gst_bit_reader_get_bits_uint8 (&bar_tender, bar_flags + i, 1))
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return FALSE;
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}
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/* the next four bits must equal 1111 */
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if (!gst_bit_reader_get_bits_uint8 (&bar_tender, &temp, 4) || temp != 0xF)
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return FALSE;
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/* parse bar values */
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for (i = 0; i < 4; ++i) {
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if (bar_flags[i]) {
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/* the next two bits must equal 11 */
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if (!gst_bit_reader_get_bits_uint8 (&bar_tender, &temp, 2) || temp != 0x3)
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return FALSE;
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if (!gst_bit_reader_get_bits_uint16 (&bar_tender, bar_vals + i, 14))
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return FALSE;
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}
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}
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/* bars are signaled in pairs: either top/bottom or left/right, but not both */
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if ((bar_flags[0] != bar_flags[1]) || (bar_flags[2] != bar_flags[3]))
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return FALSE;
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if (bar_flags[0] && bar_flags[2])
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return FALSE;
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bar->field = field;
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bar->is_letterbox = bar_flags[0];
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if (bar->is_letterbox) {
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bar->bar_data[0] = bar_vals[0];
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bar->bar_data[1] = bar_vals[1];
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} else {
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bar->bar_data[0] = bar_vals[2];
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bar->bar_data[1] = bar_vals[3];
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}
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return TRUE;
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}
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/*
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* gst_video_parse_utils_parse_afd:
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* @data: bar byte
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* @spec: #GstVideoAFDSpec indicating specification that applies to AFD byte
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* @field: #GstVideoParseUtilsField
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* @afd: pointer to #GstVideoAFD struct
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*
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* Parse afd byte into #GstVideoAFD struct
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*
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* See:
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*
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* https://www.atsc.org/wp-content/uploads/2015/03/a_53-Part-4-2009.pdf
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*
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* https://en.wikipedia.org/wiki/Active_Format_Description#Complete_list_of_AFD_codes
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*
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* and
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*
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* SMPTE ST2016-1
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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_afd (const guint8 data, GstVideoAFDSpec spec,
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GstVideoParseUtilsField field, GstVideoAFD * afd)
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{
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GstVideoAFDAspectRatio aspect_ratio = GST_VIDEO_AFD_ASPECT_RATIO_UNDEFINED;
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GstVideoAFDValue afd_data;
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g_return_val_if_fail (afd != NULL, FALSE);
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switch (spec) {
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case GST_VIDEO_AFD_SPEC_DVB_ETSI:
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case GST_VIDEO_AFD_SPEC_ATSC_A53:
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if ((data & 0x40) == 0)
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return FALSE;
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afd_data = data & 0xF;
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break;
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case GST_VIDEO_AFD_SPEC_SMPTE_ST2016_1:
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if ((data & 0x80) || (data & 0x3))
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return FALSE;
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afd_data = (data >> 3) & 0xF;
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aspect_ratio = (GstVideoAFDAspectRatio) (((data >> 2) & 1) + 1);
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break;
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default:
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g_return_val_if_reached (FALSE);
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}
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switch (afd_data) {
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case GST_VIDEO_AFD_UNAVAILABLE:
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if (spec == GST_VIDEO_AFD_SPEC_DVB_ETSI) {
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/* reserved for DVB/ETSI */
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return FALSE;
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}
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break;
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case GST_VIDEO_AFD_16_9_TOP_ALIGNED:
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case GST_VIDEO_AFD_14_9_TOP_ALIGNED:
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case GST_VIDEO_AFD_GREATER_THAN_16_9:
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case GST_VIDEO_AFD_4_3_FULL_16_9_FULL:
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case GST_VIDEO_AFD_4_3_FULL_4_3_PILLAR:
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case GST_VIDEO_AFD_16_9_LETTER_16_9_FULL:
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case GST_VIDEO_AFD_14_9_LETTER_14_9_PILLAR:
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case GST_VIDEO_AFD_4_3_FULL_14_9_CENTER:
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case GST_VIDEO_AFD_16_9_LETTER_14_9_CENTER:
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case GST_VIDEO_AFD_16_9_LETTER_4_3_CENTER:
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break;
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default:
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return FALSE;
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}
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afd->field = field;
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afd->aspect_ratio = aspect_ratio;
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afd->spec = spec;
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afd->afd = afd_data;
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return TRUE;
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}
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/*
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* gst_video_clear_user_data:
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* @user_data: #GstVideoParseUserData struct to hold parsed closed caption, bar and AFD data
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*
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* Clears the user data, resetting it for the next frame
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*/
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void
|
|
gst_video_clear_user_data (GstVideoParseUserData * user_data)
|
|
{
|
|
user_data->closedcaptions_size = 0;
|
|
user_data->bar_data_size = 0;
|
|
user_data->active_format_flag = 0;
|
|
}
|
|
|
|
/*
|
|
* gst_video_parse_user_data_unregistered:
|
|
* @elt: #GstElement that is parsing user data
|
|
* @user_data: #GstVideoParseUserDataUnregistered to hold SEI User Data Unregistered
|
|
* @br: #GstByteReader attached to buffer of user data
|
|
* @uuid: User Data Unregistered UUID
|
|
*
|
|
* Copy remaining bytes in @br and store in @user_data
|
|
*/
|
|
void
|
|
gst_video_parse_user_data_unregistered (GstElement * elt,
|
|
GstVideoParseUserDataUnregistered * user_data,
|
|
GstByteReader * br, guint8 uuid[16])
|
|
{
|
|
GstVideoUnregisteredMessage msg;
|
|
|
|
memcpy (&msg.uuid, uuid, 16);
|
|
|
|
msg.size = gst_byte_reader_get_size (br);
|
|
if (!gst_byte_reader_dup_data (br, msg.size, &msg.data)) {
|
|
g_return_if_reached ();
|
|
}
|
|
|
|
if (user_data->messages == NULL) {
|
|
user_data->messages = g_array_sized_new (FALSE, TRUE,
|
|
sizeof (GstVideoUnregisteredMessage), 3);
|
|
g_array_set_clear_func (user_data->messages,
|
|
(GDestroyNotify) gst_video_clear_unregistered_message);
|
|
}
|
|
|
|
g_array_append_val (user_data->messages, msg);
|
|
}
|
|
|
|
/*
|
|
* gst_video_push_user_data_unregistered:
|
|
* @elt: #GstElement that is pushing user data
|
|
* @user_data: #GstVideoParseUserDataUnregistered holding SEI User Data Unregistered
|
|
* @buf: (transfer none): #GstBuffer that receives the unregistered data
|
|
*
|
|
* Attach unregistered messages from @user_data to @buf as
|
|
* GstVideoSEIUserDataUnregisteredMeta
|
|
*/
|
|
void
|
|
gst_video_push_user_data_unregistered (GstElement * elt,
|
|
GstVideoParseUserDataUnregistered * user_data, GstBuffer * buf)
|
|
{
|
|
GArray *messages = user_data->messages;
|
|
guint i;
|
|
|
|
if (messages == NULL || messages->len == 0) {
|
|
GST_TRACE_OBJECT (elt, "No unregistered user data to attach");
|
|
return;
|
|
}
|
|
|
|
if (gst_buffer_get_meta (buf,
|
|
GST_VIDEO_SEI_USER_DATA_UNREGISTERED_META_API_TYPE)) {
|
|
GST_DEBUG_OBJECT (elt, "Buffer already has unregistered meta");
|
|
return;
|
|
}
|
|
|
|
for (i = 0; i < messages->len; i++) {
|
|
GstVideoUnregisteredMessage *msg =
|
|
&g_array_index (messages, GstVideoUnregisteredMessage, i);
|
|
|
|
gst_buffer_add_video_sei_user_data_unregistered_meta (buf, msg->uuid,
|
|
msg->data, msg->size);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* gst_video_clear_user_data_unregistered:
|
|
* @user_data: #GstVideoParseUserDataUnregistered holding SEI User Data Unregistered
|
|
* @free: Whether to deallocate memory resources
|
|
*
|
|
* Clears the user data unregistered, resetting it for the next frame
|
|
*/
|
|
void gst_video_clear_user_data_unregistered
|
|
(GstVideoParseUserDataUnregistered * user_data, gboolean free)
|
|
{
|
|
if (free)
|
|
g_clear_pointer (&user_data->messages, g_array_unref);
|
|
else if (user_data->messages != NULL)
|
|
g_array_set_size (user_data->messages, 0);
|
|
}
|
|
|
|
/*
|
|
* gst_video_clear_unregistered_message:
|
|
* @msg: #GstVideoUnregisteredMessage holding a single SEI User Data Unregistered
|
|
*
|
|
* Clears the message, freeing the data
|
|
*/
|
|
static void
|
|
gst_video_clear_unregistered_message (GstVideoUnregisteredMessage * msg)
|
|
{
|
|
memset (&msg->uuid, 0, sizeof msg->uuid);
|
|
g_clear_pointer (&msg->data, g_free);
|
|
msg->size = 0;
|
|
}
|