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4e14bac1ff
Co-authored-by: Andoni Morales Alastruey <ylatuya@gmail.com> Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/1312>
137 lines
4.3 KiB
C
137 lines
4.3 KiB
C
/* Gstreamer
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* Copyright 2023 Brad Hards <bradh@frogmouth.net>
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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., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, 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 "mpegts.h"
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#include "gstmpegts-private.h"
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#define GST_CAT_DEFAULT mpegts_debug
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static GstMpegtsMetadataDescriptor
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* _gst_mpegts_metadata_descriptor_copy
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(GstMpegtsMetadataDescriptor * source)
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{
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GstMpegtsMetadataDescriptor *copy =
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g_memdup2 (source, sizeof (GstMpegtsMetadataDescriptor));
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return copy;
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}
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static void
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_gst_mpegts_metadata_descriptor_free (GstMpegtsMetadataDescriptor * desc)
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{
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g_free (desc);
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}
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G_DEFINE_BOXED_TYPE (GstMpegtsMetadataDescriptor,
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gst_mpegts_metadata_descriptor,
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(GBoxedCopyFunc) _gst_mpegts_metadata_descriptor_copy,
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(GFreeFunc) _gst_mpegts_metadata_descriptor_free);
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/**
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* gst_mpegts_descriptor_parse_metadata:
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* @descriptor: a %GST_TYPE_MPEGTS_METADATA_DESCRIPTOR #GstMpegtsDescriptor
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* @res: (out) (transfer full): #GstMpegtsMetadataDescriptor
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*
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* Parses out the metadata descriptor from the @descriptor.
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*
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* See ISO/IEC 13818-1:2018 Section 2.6.60 and 2.6.61 for details.
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* metadata_application_format is provided in Table 2-82. metadata_format is
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* provided in Table 2-85.
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*
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* Returns: %TRUE if the parsing worked correctly, else %FALSE.
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*
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* Since: 1.24
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*/
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gboolean
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gst_mpegts_descriptor_parse_metadata (const GstMpegtsDescriptor * descriptor,
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GstMpegtsMetadataDescriptor ** desc)
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{
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guint8 *data;
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guint8 flag;
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GstMpegtsMetadataDescriptor *res;
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g_return_val_if_fail (descriptor != NULL && desc != NULL, FALSE);
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__common_desc_checks (descriptor, GST_MTS_DESC_METADATA, 5, FALSE);
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data = (guint8 *) descriptor->data + 2;
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res = g_new0 (GstMpegtsMetadataDescriptor, 1);
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res->metadata_application_format = GST_READ_UINT16_BE (data);
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data += 2;
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if (res->metadata_application_format == 0xFFFF) {
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// skip over metadata_application_format_identifier if it is provided
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data += 4;
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}
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res->metadata_format = *data;
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data += 1;
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if (res->metadata_format == GST_MPEGTS_METADATA_FORMAT_IDENTIFIER_FIELD) {
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res->metadata_format_identifier = GST_READ_UINT32_BE (data);
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data += 4;
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}
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res->metadata_service_id = *data;
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data += 1;
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flag = *data;
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res->decoder_config_flags = flag >> 5;
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res->dsm_cc_flag = (flag & 0x10);
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// There are more values if the dsm_cc_flag or decoder flags are set.
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*desc = res;
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return TRUE;
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}
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/**
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* gst_mpegts_descriptor_parse_metadata_std:
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* @descriptor: a %GST_MTS_DESC_METADATA_STD #GstMpegtsDescriptor
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* @metadata_input_leak_rate (out): the input leak rate in units of 400bits/sec.
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* @metadata_buffer_size (out): the buffer size in units of 1024 bytes
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* @metadata_output_leak_rate (out): the output leak rate in units of 400bits/sec.
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*
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* Extracts the metadata STD descriptor from @descriptor.
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*
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* See ISO/IEC 13818-1:2018 Section 2.6.62 and 2.6.63 for details.
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*
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* Returns: %TRUE if parsing succeeded, else %FALSE.
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*
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* Since: 1.24
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*/
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gboolean
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gst_mpegts_descriptor_parse_metadata_std (const GstMpegtsDescriptor *
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descriptor, guint32 * metadata_input_leak_rate,
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guint32 * metadata_buffer_size, guint32 * metadata_output_leak_rate)
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{
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guint8 *data;
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g_return_val_if_fail (descriptor != NULL && metadata_input_leak_rate != NULL
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&& metadata_buffer_size != NULL
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&& metadata_output_leak_rate != NULL, FALSE);
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__common_desc_checks (descriptor, GST_MTS_DESC_METADATA_STD, 9, FALSE);
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data = (guint8 *) descriptor->data + 2;
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*metadata_input_leak_rate = GST_READ_UINT24_BE (data) & 0x3FFFFF;
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data += 3;
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*metadata_buffer_size = GST_READ_UINT24_BE (data) & 0x3FFFFF;
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data += 3;
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*metadata_output_leak_rate = GST_READ_UINT24_BE (data) & 0x3FFFFF;
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return TRUE;
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}
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