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909 lines
26 KiB
C
909 lines
26 KiB
C
/*
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* gst-scte-section.c -
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* Copyright (C) 2019 Centricular ltd
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* Author: 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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#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 <stdlib.h>
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#include "mpegts.h"
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#include "gstmpegts-private.h"
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#define MPEGTIME_TO_GSTTIME(t) ((t) * (guint64)100000 / 9)
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/**
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* SECTION:gst-scte-section
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* @title: SCTE variants of MPEG-TS sections
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* @short_description: Sections for the various SCTE specifications
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* @include: gst/mpegts/mpegts.h
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*
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* This contains the %GstMpegtsSection relevent to SCTE specifications.
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*/
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/* TODO: port to gst_bit_reader / gst_bit_writer */
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/* Splice Information Table (SIT) */
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static GstMpegtsSCTESpliceEvent *
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_gst_mpegts_scte_splice_event_copy (GstMpegtsSCTESpliceEvent * event)
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{
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GstMpegtsSCTESpliceEvent *copy =
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g_memdup2 (event, sizeof (GstMpegtsSCTESpliceEvent));
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copy->components = g_ptr_array_ref (event->components);
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return copy;
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}
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static void
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_gst_mpegts_scte_splice_event_free (GstMpegtsSCTESpliceEvent * event)
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{
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g_ptr_array_unref (event->components);
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g_free (event);
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}
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G_DEFINE_BOXED_TYPE (GstMpegtsSCTESpliceEvent, gst_mpegts_scte_splice_event,
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(GBoxedCopyFunc) _gst_mpegts_scte_splice_event_copy,
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(GFreeFunc) _gst_mpegts_scte_splice_event_free);
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static GstMpegtsSCTESpliceComponent *
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_gst_mpegts_scte_splice_component_copy (GstMpegtsSCTESpliceComponent *
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component)
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{
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return g_memdup2 (component, sizeof (GstMpegtsSCTESpliceComponent));
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}
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static void
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_gst_mpegts_scte_splice_component_free (GstMpegtsSCTESpliceComponent *
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component)
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{
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g_free (component);
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}
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G_DEFINE_BOXED_TYPE (GstMpegtsSCTESpliceComponent,
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gst_mpegts_scte_splice_component,
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(GBoxedCopyFunc) _gst_mpegts_scte_splice_component_copy,
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(GFreeFunc) _gst_mpegts_scte_splice_component_free);
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static GstMpegtsSCTESpliceComponent *
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_parse_splice_component (GstMpegtsSCTESpliceEvent * event, guint8 ** orig_data,
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guint8 * end)
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{
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GstMpegtsSCTESpliceComponent *component =
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g_new0 (GstMpegtsSCTESpliceComponent, 1);
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guint8 *data = *orig_data;
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if (data + 1 + 6 > end)
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goto error;
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component->tag = *data;
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data += 1;
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if (event->insert_event && event->splice_immediate_flag == 0) {
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component->splice_time_specified = *data >> 7;
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if (component->splice_time_specified) {
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component->splice_time = ((guint64) (*data & 0x01)) << 32;
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data += 1;
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component->splice_time += GST_READ_UINT32_BE (data);
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data += 4;
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GST_LOG ("component %u splice_time %" G_GUINT64_FORMAT " (%"
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GST_TIME_FORMAT ")", component->tag, component->splice_time,
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GST_TIME_ARGS (MPEGTIME_TO_GSTTIME (component->splice_time)));
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} else {
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data += 1;
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}
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} else if (!event->insert_event) {
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component->utc_splice_time = GST_READ_UINT32_BE (data);
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GST_LOG ("component %u utc_splice_time %u", component->tag,
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component->utc_splice_time);
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data += 4;
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}
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*orig_data = data;
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return component;
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error:
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{
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if (event)
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_gst_mpegts_scte_splice_event_free (event);
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return NULL;
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}
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}
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static GstMpegtsSCTESpliceEvent *
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_parse_splice_event (guint8 ** orig_data, guint8 * end, gboolean insert_event)
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{
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GstMpegtsSCTESpliceEvent *event = g_new0 (GstMpegtsSCTESpliceEvent, 1);
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guint8 *data = *orig_data;
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/* Note : +6 is because of the final descriptor_loop_length and CRC */
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if (data + 5 + 6 > end)
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goto error;
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event->components = g_ptr_array_new_with_free_func ((GDestroyNotify)
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_gst_mpegts_scte_splice_component_free);
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event->insert_event = insert_event;
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event->splice_event_id = GST_READ_UINT32_BE (data);
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GST_LOG ("splice_event_id: 0x%08x", event->splice_event_id);
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data += 4;
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event->splice_event_cancel_indicator = *data >> 7;
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GST_LOG ("splice_event_cancel_indicator: %d",
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event->splice_event_cancel_indicator);
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data += 1;
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GST_DEBUG ("data %p", data);
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if (event->splice_event_cancel_indicator == 0) {
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if (data + 5 + 6 > end)
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goto error;
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event->out_of_network_indicator = *data >> 7;
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event->program_splice_flag = (*data >> 6) & 0x01;
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event->duration_flag = (*data >> 5) & 0x01;
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if (insert_event)
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event->splice_immediate_flag = (*data >> 4) & 0x01;
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GST_LOG ("out_of_network_indicator:%d", event->out_of_network_indicator);
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GST_LOG ("program_splice_flag:%d", event->program_splice_flag);
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GST_LOG ("duration_flag:%d", event->duration_flag);
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if (insert_event)
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GST_LOG ("splice_immediate_flag:%d", event->splice_immediate_flag);
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data += 1;
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if (event->program_splice_flag == 0) {
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guint component_count = *data;
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guint i;
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data += 1;
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for (i = 0; i < component_count; i++) {
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GstMpegtsSCTESpliceComponent *component =
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_parse_splice_component (event, &data, end);
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if (component == NULL)
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goto error;
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g_ptr_array_add (event->components, component);
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}
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} else {
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if (insert_event && event->splice_immediate_flag == 0) {
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event->program_splice_time_specified = *data >> 7;
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if (event->program_splice_time_specified) {
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event->program_splice_time = ((guint64) (*data & 0x01)) << 32;
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data += 1;
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event->program_splice_time += GST_READ_UINT32_BE (data);
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data += 4;
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GST_LOG ("program_splice_time %" G_GUINT64_FORMAT " (%"
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GST_TIME_FORMAT ")", event->program_splice_time,
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GST_TIME_ARGS (MPEGTIME_TO_GSTTIME (event->program_splice_time)));
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} else
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data += 1;
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} else if (!insert_event) {
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event->utc_splice_time = GST_READ_UINT32_BE (data);
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GST_LOG ("utc_splice_time %u", event->utc_splice_time);
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data += 4;
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}
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}
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if (event->duration_flag) {
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event->break_duration_auto_return = *data >> 7;
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event->break_duration = ((guint64) (*data & 0x01)) << 32;
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data += 1;
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event->break_duration += GST_READ_UINT32_BE (data);
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data += 4;
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GST_LOG ("break_duration_auto_return:%d",
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event->break_duration_auto_return);
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GST_LOG ("break_duration %" G_GUINT64_FORMAT " (%" GST_TIME_FORMAT ")",
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event->break_duration,
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GST_TIME_ARGS (MPEGTIME_TO_GSTTIME (event->break_duration)));
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}
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event->unique_program_id = GST_READ_UINT16_BE (data);
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GST_LOG ("unique_program_id:%" G_GUINT16_FORMAT, event->unique_program_id);
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data += 2;
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event->avail_num = *data++;
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event->avails_expected = *data++;
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GST_LOG ("avail %d/%d", event->avail_num, event->avails_expected);
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}
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GST_DEBUG ("done");
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*orig_data = data;
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return event;
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error:
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{
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if (event)
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_gst_mpegts_scte_splice_event_free (event);
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return NULL;
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}
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}
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static GstMpegtsSCTESIT *
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_gst_mpegts_scte_sit_copy (GstMpegtsSCTESIT * sit)
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{
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GstMpegtsSCTESIT *copy = g_memdup2 (sit, sizeof (GstMpegtsSCTESIT));
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copy->splices = g_ptr_array_ref (sit->splices);
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copy->descriptors = g_ptr_array_ref (sit->descriptors);
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return copy;
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}
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static void
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_gst_mpegts_scte_sit_free (GstMpegtsSCTESIT * sit)
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{
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g_ptr_array_unref (sit->splices);
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g_ptr_array_unref (sit->descriptors);
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g_free (sit);
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}
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G_DEFINE_BOXED_TYPE (GstMpegtsSCTESIT, gst_mpegts_scte_sit,
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(GBoxedCopyFunc) _gst_mpegts_scte_sit_copy,
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(GFreeFunc) _gst_mpegts_scte_sit_free);
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static gpointer
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_parse_sit (GstMpegtsSection * section)
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{
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GstMpegtsSCTESIT *sit = NULL;
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guint8 *data, *end;
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guint32 tmp;
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GST_DEBUG ("SIT");
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/* Even if the section is not a short one, it still uses CRC */
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if (_calc_crc32 (section->data, section->section_length) != 0) {
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GST_WARNING ("PID:0x%04x table_id:0x%02x, Bad CRC on section", section->pid,
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section->table_id);
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return NULL;
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}
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sit = g_new0 (GstMpegtsSCTESIT, 1);
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sit->fully_parsed = FALSE;
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data = section->data;
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end = data + section->section_length;
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GST_MEMDUMP ("section", data, section->section_length);
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/* Skip already-checked fields */
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data += 3;
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/* Ensure protocol_version is 0 */
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if (*data != 0) {
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GST_WARNING ("Unsupported SCTE SIT protocol version (%d)", *data);
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goto error;
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}
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data += 1;
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/* encryption */
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sit->encrypted_packet = (*data) >> 7;
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sit->encryption_algorithm = (*data) & 0x3f;
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sit->pts_adjustment = ((guint64) (*data & 0x01)) << 32;
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data += 1;
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sit->pts_adjustment += GST_READ_UINT32_BE (data);
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data += 4;
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sit->cw_index = *data;
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data += 1;
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tmp = GST_READ_UINT24_BE (data);
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data += 3;
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sit->tier = (tmp >> 12);
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sit->splice_command_length = tmp & 0xfff;
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/* 0xfff is for backwards compatibility when reading */
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if (sit->splice_command_length == 0xfff)
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sit->splice_command_length = 0;
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GST_LOG ("command length %d", sit->splice_command_length);
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if (sit->encrypted_packet) {
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GST_LOG ("Encrypted SIT, parsed partially");
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goto done;
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}
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if (sit->splice_command_length
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&& (data + sit->splice_command_length > end - 5)) {
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GST_WARNING ("PID %d invalid SCTE SIT splice command length %d",
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section->pid, sit->splice_command_length);
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goto error;
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}
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sit->splice_command_type = *data;
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data += 1;
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sit->splices = g_ptr_array_new_with_free_func ((GDestroyNotify)
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_gst_mpegts_scte_splice_event_free);
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switch (sit->splice_command_type) {
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case GST_MTS_SCTE_SPLICE_COMMAND_NULL:
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case GST_MTS_SCTE_SPLICE_COMMAND_BANDWIDTH:
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/* These commands have no payload */
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break;
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case GST_MTS_SCTE_SPLICE_COMMAND_TIME:
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{
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sit->splice_time_specified = (*data >> 7);
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if (sit->splice_time_specified) {
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sit->splice_time = ((guint64) (*data & 0x01)) << 32;
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data += 1;
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sit->splice_time += GST_READ_UINT32_BE (data);
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data += 4;
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} else
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data += 1;
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}
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break;
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case GST_MTS_SCTE_SPLICE_COMMAND_SCHEDULE:
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{
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guint i;
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guint splice_count = *data;
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data += 1;
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for (i = 0; i < splice_count; i++) {
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GstMpegtsSCTESpliceEvent *event =
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_parse_splice_event (&data, end, FALSE);
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if (event == NULL)
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goto error;
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g_ptr_array_add (sit->splices, event);
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}
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}
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break;
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case GST_MTS_SCTE_SPLICE_COMMAND_INSERT:
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{
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GstMpegtsSCTESpliceEvent *event = _parse_splice_event (&data, end, TRUE);
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if (event == NULL)
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goto error;
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g_ptr_array_add (sit->splices, event);
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}
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break;
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case GST_MTS_SCTE_SPLICE_COMMAND_PRIVATE:
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{
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GST_FIXME ("Implement SCTE-35 private commands");
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data += sit->splice_command_length;
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}
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break;
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default:
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GST_WARNING ("Unknown SCTE splice command type (0x%02x) !",
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sit->splice_command_type);
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break;;
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}
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/* descriptors */
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tmp = GST_READ_UINT16_BE (data);
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data += 2;
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GST_MEMDUMP ("desc ?", data, tmp);
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sit->descriptors = gst_mpegts_parse_descriptors (data, tmp);
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if (!sit->descriptors) {
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GST_DEBUG ("no descriptors %d", tmp);
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goto error;
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}
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data += tmp;
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GST_DEBUG ("%p - %p", data, end);
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if (data != end - 4) {
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GST_WARNING ("PID %d invalid SIT parsed %d length %d",
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section->pid, (gint) (data - section->data), section->section_length);
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goto error;
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}
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sit->fully_parsed = TRUE;
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done:
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return sit;
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error:
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if (sit) {
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_gst_mpegts_scte_sit_free (sit);
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sit = NULL;
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}
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goto done;
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}
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/**
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* gst_mpegts_section_get_scte_sit:
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* @section: a #GstMpegtsSection of type %GST_MPEGTS_SECTION_SCTE_SIT
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*
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* Returns the #GstMpegtsSCTESIT contained in the @section.
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*
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* Returns: The #GstMpegtsSCTESIT contained in the section, or %NULL if an error
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* happened.
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*/
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const GstMpegtsSCTESIT *
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gst_mpegts_section_get_scte_sit (GstMpegtsSection * section)
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{
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g_return_val_if_fail (section->section_type == GST_MPEGTS_SECTION_SCTE_SIT,
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NULL);
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g_return_val_if_fail (section->cached_parsed || section->data, NULL);
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if (!section->cached_parsed)
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section->cached_parsed =
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__common_section_checks (section, 18, _parse_sit,
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(GDestroyNotify) _gst_mpegts_scte_sit_free);
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return (const GstMpegtsSCTESIT *) section->cached_parsed;
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}
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/**
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* gst_mpegts_scte_sit_new:
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*
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* Allocates and initializes a #GstMpegtsSCTESIT.
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*
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* Returns: (transfer full): A newly allocated #GstMpegtsSCTESIT
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*/
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GstMpegtsSCTESIT *
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gst_mpegts_scte_sit_new (void)
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{
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GstMpegtsSCTESIT *sit;
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sit = g_new0 (GstMpegtsSCTESIT, 1);
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/* Set all default values (which aren't already 0/NULL) */
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sit->tier = 0xfff;
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sit->fully_parsed = TRUE;
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sit->splices = g_ptr_array_new_with_free_func ((GDestroyNotify)
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_gst_mpegts_scte_splice_event_free);
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sit->descriptors = g_ptr_array_new_with_free_func ((GDestroyNotify)
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gst_mpegts_descriptor_free);
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sit->is_running_time = TRUE;
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return sit;
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}
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/**
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* gst_mpegts_scte_null_new:
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*
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* Allocates and initializes a NULL command #GstMpegtsSCTESIT.
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*
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* Returns: (transfer full): A newly allocated #GstMpegtsSCTESIT
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*/
|
|
GstMpegtsSCTESIT *
|
|
gst_mpegts_scte_null_new (void)
|
|
{
|
|
GstMpegtsSCTESIT *sit = gst_mpegts_scte_sit_new ();
|
|
|
|
sit->splice_command_type = GST_MTS_SCTE_SPLICE_COMMAND_NULL;
|
|
|
|
sit->is_running_time = TRUE;
|
|
|
|
return sit;
|
|
}
|
|
|
|
/**
|
|
* gst_mpegts_scte_cancel_new:
|
|
* @event_id: The event ID to cancel.
|
|
*
|
|
* Allocates and initializes a new INSERT command #GstMpegtsSCTESIT
|
|
* setup to cancel the specified @event_id.
|
|
*
|
|
* Returns: (transfer full): A newly allocated #GstMpegtsSCTESIT
|
|
*/
|
|
GstMpegtsSCTESIT *
|
|
gst_mpegts_scte_cancel_new (guint32 event_id)
|
|
{
|
|
GstMpegtsSCTESIT *sit = gst_mpegts_scte_sit_new ();
|
|
GstMpegtsSCTESpliceEvent *event = gst_mpegts_scte_splice_event_new ();
|
|
|
|
sit->splice_command_type = GST_MTS_SCTE_SPLICE_COMMAND_INSERT;
|
|
event->splice_event_id = event_id;
|
|
event->splice_event_cancel_indicator = TRUE;
|
|
g_ptr_array_add (sit->splices, event);
|
|
|
|
sit->is_running_time = TRUE;
|
|
|
|
return sit;
|
|
}
|
|
|
|
/**
|
|
* gst_mpegts_scte_splice_in_new:
|
|
* @event_id: The event ID.
|
|
* @splice_time: The running time for the splice event
|
|
*
|
|
* Allocates and initializes a new "Splice In" INSERT command
|
|
* #GstMpegtsSCTESIT for the given @event_id and @splice_time.
|
|
*
|
|
* If the @splice_time is #G_MAXUINT64 then the event will be
|
|
* immediate as opposed to for the target @splice_time.
|
|
*
|
|
* Returns: (transfer full): A newly allocated #GstMpegtsSCTESIT
|
|
*/
|
|
GstMpegtsSCTESIT *
|
|
gst_mpegts_scte_splice_in_new (guint32 event_id, GstClockTime splice_time)
|
|
{
|
|
GstMpegtsSCTESIT *sit = gst_mpegts_scte_sit_new ();
|
|
GstMpegtsSCTESpliceEvent *event = gst_mpegts_scte_splice_event_new ();
|
|
|
|
sit->splice_command_type = GST_MTS_SCTE_SPLICE_COMMAND_INSERT;
|
|
event->splice_event_id = event_id;
|
|
event->insert_event = TRUE;
|
|
if (splice_time == G_MAXUINT64) {
|
|
event->splice_immediate_flag = TRUE;
|
|
} else {
|
|
event->program_splice_time_specified = TRUE;
|
|
event->program_splice_time = splice_time;
|
|
}
|
|
g_ptr_array_add (sit->splices, event);
|
|
|
|
sit->is_running_time = TRUE;
|
|
|
|
return sit;
|
|
}
|
|
|
|
/**
|
|
* gst_mpegts_scte_splice_out_new:
|
|
* @event_id: The event ID.
|
|
* @splice_time: The running time for the splice event
|
|
* @duration: The optional duration.
|
|
*
|
|
* Allocates and initializes a new "Splice Out" INSERT command
|
|
* #GstMpegtsSCTESIT for the given @event_id, @splice_time and
|
|
* @duration.
|
|
*
|
|
* If the @splice_time is #G_MAXUINT64 then the event will be
|
|
* immediate as opposed to for the target @splice_time.
|
|
*
|
|
* If the @duration is 0 it won't be specified in the event.
|
|
*
|
|
* Returns: (transfer full): A newly allocated #GstMpegtsSCTESIT
|
|
*/
|
|
GstMpegtsSCTESIT *
|
|
gst_mpegts_scte_splice_out_new (guint32 event_id, GstClockTime splice_time,
|
|
GstClockTime duration)
|
|
{
|
|
GstMpegtsSCTESIT *sit = gst_mpegts_scte_sit_new ();
|
|
GstMpegtsSCTESpliceEvent *event = gst_mpegts_scte_splice_event_new ();
|
|
|
|
sit->splice_command_type = GST_MTS_SCTE_SPLICE_COMMAND_INSERT;
|
|
event->splice_event_id = event_id;
|
|
event->out_of_network_indicator = TRUE;
|
|
event->insert_event = TRUE;
|
|
if (splice_time == G_MAXUINT64) {
|
|
event->splice_immediate_flag = TRUE;
|
|
} else {
|
|
event->program_splice_time_specified = TRUE;
|
|
event->program_splice_time = splice_time;
|
|
}
|
|
if (duration != 0) {
|
|
event->duration_flag = TRUE;
|
|
event->break_duration = duration;
|
|
}
|
|
g_ptr_array_add (sit->splices, event);
|
|
|
|
sit->is_running_time = TRUE;
|
|
|
|
return sit;
|
|
}
|
|
|
|
/**
|
|
* gst_mpegts_scte_splice_event_new:
|
|
*
|
|
* Allocates and initializes a #GstMpegtsSCTESpliceEvent.
|
|
*
|
|
* Returns: (transfer full): A newly allocated #GstMpegtsSCTESpliceEvent
|
|
*/
|
|
GstMpegtsSCTESpliceEvent *
|
|
gst_mpegts_scte_splice_event_new (void)
|
|
{
|
|
GstMpegtsSCTESpliceEvent *event = g_new0 (GstMpegtsSCTESpliceEvent, 1);
|
|
|
|
/* Non-0 Default values */
|
|
event->program_splice_flag = TRUE;
|
|
event->components = g_ptr_array_new_with_free_func ((GDestroyNotify)
|
|
_gst_mpegts_scte_splice_component_free);
|
|
|
|
|
|
return event;
|
|
}
|
|
|
|
/**
|
|
* gst_mpegts_scte_splice_component_new:
|
|
* @tag: the elementary PID stream identifier
|
|
*
|
|
* Allocates and initializes a #GstMpegtsSCTESpliceComponent.
|
|
*
|
|
* Returns: (transfer full): A newly allocated #GstMpegtsSCTESpliceComponent
|
|
* Since: 1.20
|
|
*/
|
|
GstMpegtsSCTESpliceComponent *
|
|
gst_mpegts_scte_splice_component_new (guint8 tag)
|
|
{
|
|
GstMpegtsSCTESpliceComponent *component =
|
|
g_new0 (GstMpegtsSCTESpliceComponent, 1);
|
|
|
|
component->tag = tag;
|
|
|
|
return component;
|
|
}
|
|
|
|
static gboolean
|
|
_packetize_sit (GstMpegtsSection * section)
|
|
{
|
|
gsize length, command_length, descriptor_length;
|
|
const GstMpegtsSCTESIT *sit;
|
|
GstMpegtsDescriptor *descriptor;
|
|
guint32 tmp32;
|
|
guint i;
|
|
guint8 *data;
|
|
|
|
sit = gst_mpegts_section_get_scte_sit (section);
|
|
|
|
if (sit == NULL)
|
|
return FALSE;
|
|
|
|
if (sit->fully_parsed == FALSE) {
|
|
GST_WARNING ("Attempted to packetize an incompletely parsed SIT");
|
|
return FALSE;
|
|
}
|
|
|
|
/* Skip cases we don't handle for now */
|
|
if (sit->encrypted_packet) {
|
|
GST_WARNING ("SCTE encrypted packet is not supported");
|
|
return FALSE;
|
|
}
|
|
|
|
switch (sit->splice_command_type) {
|
|
case GST_MTS_SCTE_SPLICE_COMMAND_PRIVATE:
|
|
GST_WARNING ("SCTE command not supported");
|
|
return FALSE;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
/* Smallest splice section are the NULL and bandwith command:
|
|
* 14 bytes for the header
|
|
* 0 bytes for the command
|
|
* 2 bytes for the empty descriptor loop length
|
|
* 4 bytes for the CRC */
|
|
length = 20;
|
|
|
|
command_length = 0;
|
|
/* Add the size of splices */
|
|
for (i = 0; i < sit->splices->len; i++) {
|
|
GstMpegtsSCTESpliceEvent *event = g_ptr_array_index (sit->splices, i);
|
|
/* There is at least 5 bytes */
|
|
command_length += 5;
|
|
if (!event->splice_event_cancel_indicator) {
|
|
/* Add at least 5 bytes for common fields */
|
|
command_length += 5;
|
|
|
|
if (event->program_splice_flag) {
|
|
if (event->insert_event) {
|
|
if (!event->splice_immediate_flag) {
|
|
if (event->program_splice_time_specified)
|
|
command_length += 5;
|
|
else
|
|
command_length += 1;
|
|
}
|
|
} else {
|
|
/* Schedule events, 4 bytes for utc_splice_time */
|
|
command_length += 4;
|
|
}
|
|
} else {
|
|
guint j;
|
|
|
|
/* component_count */
|
|
command_length += 1;
|
|
|
|
for (j = 0; j < event->components->len; j++) {
|
|
GstMpegtsSCTESpliceComponent *component =
|
|
g_ptr_array_index (event->components, j);
|
|
|
|
/* component_tag */
|
|
command_length += 1;
|
|
if (event->insert_event) {
|
|
if (!event->splice_immediate_flag) {
|
|
if (component->splice_time_specified)
|
|
command_length += 5;
|
|
else
|
|
command_length += 1;
|
|
}
|
|
} else {
|
|
/* utc_splice_time */
|
|
command_length += 4;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (event->duration_flag)
|
|
command_length += 5;
|
|
}
|
|
}
|
|
|
|
if (sit->splice_command_type == GST_MTS_SCTE_SPLICE_COMMAND_TIME) {
|
|
if (sit->splice_time_specified)
|
|
command_length += 5;
|
|
else
|
|
command_length += 1;
|
|
}
|
|
|
|
length += command_length;
|
|
|
|
/* Calculate size of descriptors */
|
|
|
|
descriptor_length = 0;
|
|
for (i = 0; i < sit->descriptors->len; i++) {
|
|
descriptor = g_ptr_array_index (sit->descriptors, i);
|
|
descriptor_length += descriptor->length + 2;
|
|
}
|
|
length += descriptor_length;
|
|
|
|
/* Max length of SIT section is 4093 bytes */
|
|
g_return_val_if_fail (length <= 4093, FALSE);
|
|
|
|
_packetize_common_section (section, length);
|
|
|
|
data = section->data + 3;
|
|
/* Protocol version (default 0) */
|
|
*data++ = 0;
|
|
/* 7bits for encryption (not supported : 0) */
|
|
/* 33bits for pts_adjustment */
|
|
*data++ = (sit->pts_adjustment) >> 32 & 0x01;
|
|
GST_WRITE_UINT32_BE (data, sit->pts_adjustment & 0xffffffff);
|
|
data += 4;
|
|
/* cw_index : 8 bit */
|
|
*data++ = sit->cw_index;
|
|
/* tier : 12bit
|
|
* splice_command_length : 12bit
|
|
* splice_command_type : 8 bit */
|
|
tmp32 = (sit->tier & 0xfff) << 20;
|
|
tmp32 |= (command_length & 0xfff) << 8;
|
|
tmp32 |= sit->splice_command_type;
|
|
GST_WRITE_UINT32_BE (data, tmp32);
|
|
data += 4;
|
|
|
|
if (sit->splice_command_type == GST_MTS_SCTE_SPLICE_COMMAND_TIME) {
|
|
if (!sit->splice_time_specified) {
|
|
*data++ = 0x7f;
|
|
} else {
|
|
*data++ = 0xf2 | ((sit->splice_time >> 32) & 0x1);
|
|
GST_WRITE_UINT32_BE (data, sit->splice_time & 0xffffffff);
|
|
data += 4;
|
|
}
|
|
}
|
|
|
|
/* Write the events */
|
|
for (i = 0; i < sit->splices->len; i++) {
|
|
GstMpegtsSCTESpliceEvent *event = g_ptr_array_index (sit->splices, i);
|
|
|
|
/* splice_event_id : 32bit */
|
|
GST_WRITE_UINT32_BE (data, event->splice_event_id);
|
|
data += 4;
|
|
/* splice_event_cancel_indicator : 1bit
|
|
* reserved ; 7bit */
|
|
*data++ = event->splice_event_cancel_indicator ? 0xff : 0x7f;
|
|
|
|
if (!event->splice_event_cancel_indicator) {
|
|
/* out_of_network_indicator : 1bit
|
|
* program_splice_flag : 1bit
|
|
* duration_flag : 1bit
|
|
* splice_immediate_flag : 1bit
|
|
* reserved : 4bit */
|
|
*data++ = (event->out_of_network_indicator << 7) |
|
|
(event->program_splice_flag << 6) |
|
|
(event->duration_flag << 5) |
|
|
(event->insert_event ? (event->splice_immediate_flag << 4) : 0) |
|
|
0x0f;
|
|
if (event->program_splice_flag) {
|
|
if (event->insert_event) {
|
|
if (!event->splice_immediate_flag) {
|
|
/* program_splice_time_specified : 1bit
|
|
* reserved : 6/7 bit */
|
|
if (!event->program_splice_time_specified)
|
|
*data++ = 0x7f;
|
|
else {
|
|
/* time : 33bit */
|
|
*data++ = 0xf2 | ((event->program_splice_time >> 32) & 0x1);
|
|
GST_WRITE_UINT32_BE (data,
|
|
event->program_splice_time & 0xffffffff);
|
|
data += 4;
|
|
}
|
|
}
|
|
} else {
|
|
GST_WRITE_UINT32_BE (data, event->utc_splice_time);
|
|
data += 4;
|
|
}
|
|
} else {
|
|
guint j;
|
|
|
|
*data++ = event->components->len & 0xff;
|
|
|
|
for (j = 0; j < event->components->len; j++) {
|
|
GstMpegtsSCTESpliceComponent *component =
|
|
g_ptr_array_index (event->components, j);
|
|
|
|
*data++ = component->tag;
|
|
|
|
if (event->insert_event) {
|
|
if (!event->splice_immediate_flag) {
|
|
/* program_splice_time_specified : 1bit
|
|
* reserved : 6/7 bit */
|
|
if (!component->splice_time_specified)
|
|
*data++ = 0x7f;
|
|
else {
|
|
/* time : 33bit */
|
|
*data++ = 0xf2 | ((component->splice_time >> 32) & 0x1);
|
|
GST_WRITE_UINT32_BE (data, component->splice_time & 0xffffffff);
|
|
data += 4;
|
|
}
|
|
}
|
|
} else {
|
|
GST_WRITE_UINT32_BE (data, component->utc_splice_time);
|
|
data += 4;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (event->duration_flag) {
|
|
*data = event->break_duration_auto_return ? 0xfe : 0x7e;
|
|
*data++ |= (event->break_duration >> 32) & 0x1;
|
|
GST_WRITE_UINT32_BE (data, event->break_duration & 0xffffffff);
|
|
data += 4;
|
|
}
|
|
/* unique_program_id : 16bit */
|
|
GST_WRITE_UINT16_BE (data, event->unique_program_id);
|
|
data += 2;
|
|
/* avail_num : 8bit */
|
|
*data++ = event->avail_num;
|
|
/* avails_expected : 8bit */
|
|
*data++ = event->avails_expected;
|
|
}
|
|
}
|
|
|
|
/* Descriptors */
|
|
GST_WRITE_UINT16_BE (data, descriptor_length);
|
|
data += 2;
|
|
_packetize_descriptor_array (sit->descriptors, &data);
|
|
|
|
/* CALCULATE AND WRITE THE CRC ! */
|
|
GST_WRITE_UINT32_BE (data, _calc_crc32 (section->data, data - section->data));
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
/**
|
|
* gst_mpegts_section_from_scte_sit:
|
|
* @sit: (transfer full): a #GstMpegtsSCTESIT to create the #GstMpegtsSection from
|
|
*
|
|
* Ownership of @sit is taken. The data in @sit is managed by the #GstMpegtsSection
|
|
*
|
|
* Returns: (transfer full): the #GstMpegtsSection
|
|
*/
|
|
GstMpegtsSection *
|
|
gst_mpegts_section_from_scte_sit (GstMpegtsSCTESIT * sit, guint16 pid)
|
|
{
|
|
GstMpegtsSection *section;
|
|
|
|
g_return_val_if_fail (sit != NULL, NULL);
|
|
|
|
section = _gst_mpegts_section_init (pid, GST_MTS_TABLE_ID_SCTE_SPLICE);
|
|
|
|
section->short_section = TRUE;
|
|
section->cached_parsed = (gpointer) sit;
|
|
section->packetizer = _packetize_sit;
|
|
section->destroy_parsed = (GDestroyNotify) _gst_mpegts_scte_sit_free;
|
|
section->short_section = TRUE;
|
|
|
|
return section;
|
|
}
|