gstreamer/subprojects/gst-plugins-bad/gst-libs/gst/mpegts/gst-metadata-descriptor.c

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/* Gstreamer
* Copyright 2023 Brad Hards <bradh@frogmouth.net>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "mpegts.h"
#include "gstmpegts-private.h"
#define GST_CAT_DEFAULT mpegts_debug
static GstMpegtsMetadataDescriptor
* _gst_mpegts_metadata_descriptor_copy
(GstMpegtsMetadataDescriptor * source)
{
GstMpegtsMetadataDescriptor *copy =
g_memdup2 (source, sizeof (GstMpegtsMetadataDescriptor));
return copy;
}
static void
_gst_mpegts_metadata_descriptor_free (GstMpegtsMetadataDescriptor * desc)
{
g_free (desc);
}
G_DEFINE_BOXED_TYPE (GstMpegtsMetadataDescriptor,
gst_mpegts_metadata_descriptor,
(GBoxedCopyFunc) _gst_mpegts_metadata_descriptor_copy,
(GFreeFunc) _gst_mpegts_metadata_descriptor_free);
/**
* gst_mpegts_descriptor_parse_metadata:
* @descriptor: a %GST_TYPE_MPEGTS_METADATA_DESCRIPTOR #GstMpegtsDescriptor
* @res: (out) (transfer full): #GstMpegtsMetadataDescriptor
*
* Parses out the metadata descriptor from the @descriptor.
*
* See ISO/IEC 13818-1:2018 Section 2.6.60 and 2.6.61 for details.
* metadata_application_format is provided in Table 2-82. metadata_format is
* provided in Table 2-85.
*
* Returns: %TRUE if the parsing worked correctly, else %FALSE.
*
* Since: 1.24
*/
gboolean
gst_mpegts_descriptor_parse_metadata (const GstMpegtsDescriptor * descriptor,
GstMpegtsMetadataDescriptor ** desc)
{
guint8 *data;
guint8 flag;
GstMpegtsMetadataDescriptor *res;
g_return_val_if_fail (descriptor != NULL && desc != NULL, FALSE);
__common_desc_checks (descriptor, GST_MTS_DESC_METADATA, 5, FALSE);
data = (guint8 *) descriptor->data + 2;
res = g_new0 (GstMpegtsMetadataDescriptor, 1);
res->metadata_application_format = GST_READ_UINT16_BE (data);
data += 2;
if (res->metadata_application_format == 0xFFFF) {
// skip over metadata_application_format_identifier if it is provided
data += 4;
}
res->metadata_format = *data;
data += 1;
if (res->metadata_format == GST_MPEGTS_METADATA_FORMAT_IDENTIFIER_FIELD) {
res->metadata_format_identifier = GST_READ_UINT32_BE (data);
data += 4;
}
res->metadata_service_id = *data;
data += 1;
flag = *data;
res->decoder_config_flags = flag >> 5;
res->dsm_cc_flag = (flag & 0x10);
// There are more values if the dsm_cc_flag or decoder flags are set.
*desc = res;
return TRUE;
}
/**
* gst_mpegts_descriptor_parse_metadata_std:
* @descriptor: a %GST_MTS_DESC_METADATA_STD #GstMpegtsDescriptor
* @metadata_input_leak_rate (out): the input leak rate in units of 400bits/sec.
* @metadata_buffer_size (out): the buffer size in units of 1024 bytes
* @metadata_output_leak_rate (out): the output leak rate in units of 400bits/sec.
*
* Extracts the metadata STD descriptor from @descriptor.
*
* See ISO/IEC 13818-1:2018 Section 2.6.62 and 2.6.63 for details.
*
* Returns: %TRUE if parsing succeeded, else %FALSE.
*
* Since: 1.24
*/
gboolean
gst_mpegts_descriptor_parse_metadata_std (const GstMpegtsDescriptor *
descriptor, guint32 * metadata_input_leak_rate,
guint32 * metadata_buffer_size, guint32 * metadata_output_leak_rate)
{
guint8 *data;
g_return_val_if_fail (descriptor != NULL && metadata_input_leak_rate != NULL
&& metadata_buffer_size != NULL
&& metadata_output_leak_rate != NULL, FALSE);
__common_desc_checks (descriptor, GST_MTS_DESC_METADATA_STD, 9, FALSE);
data = (guint8 *) descriptor->data + 2;
*metadata_input_leak_rate = GST_READ_UINT24_BE (data) & 0x3FFFFF;
data += 3;
*metadata_buffer_size = GST_READ_UINT24_BE (data) & 0x3FFFFF;
data += 3;
*metadata_output_leak_rate = GST_READ_UINT24_BE (data) & 0x3FFFFF;
return TRUE;
}