gstreamer/subprojects/gst-plugins-bad/gst-libs/gst/mpegts/gst-dvb-section.c

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/*
* gstmpegtssection.c -
* Copyright (C) 2013 Edward Hervey
* Copyright (C) 2011, Hewlett-Packard Development Company, L.P.
* Copyright (C) 2007 Alessandro Decina
* 2010 Edward Hervey
* Author: Youness Alaoui <youness.alaoui@collabora.co.uk>, Collabora Ltd.
* Author: Sebastian Dröge <sebastian.droege@collabora.co.uk>, Collabora Ltd.
* Author: Edward Hervey <bilboed@bilboed.com>, Collabora Ltd.
*
* Authors:
* Alessandro Decina <alessandro@nnva.org>
* Zaheer Abbas Merali <zaheerabbas at merali dot org>
* Edward Hervey <edward@collabora.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
libs: fix API export/import and 'inconsistent linkage' on MSVC For each lib we build export its own API in headers when we're building it, otherwise import the API from the headers. This fixes linker warnings on Windows when building with MSVC. The problem was that we had defined all GST_*_API decorators unconditionally to GST_EXPORT. This was intentional and only supposed to be temporary, but caused linker warnings because we tell the linker that we want to export all symbols even those from externall DLLs, and when the linker notices that they were in external DLLS and not present locally it warns. What we need to do when building each library is: export the library's own symbols and import all other symbols. To this end we define e.g. BUILDING_GST_FOO and then we define the GST_FOO_API decorator either to export or to import symbols depending on whether BUILDING_GST_FOO is set or not. That way external users of each library API automatically get the import. While we're at it, add new GST_API_EXPORT in config.h and use that for GST_*_API decorators instead of GST_EXPORT. The right export define depends on the toolchain and whether we're using -fvisibility=hidden or not, so it's better to set it to the right thing directly than hard-coding a compiler whitelist in the public header. We put the export define into config.h instead of passing it via the command line to the compiler because it might contain spaces and brackets and in the autotools scenario we'd have to pass that through multiple layers of plumbing and Makefile/shell escaping and we're just not going to be *that* lucky. The export define is only used if we're compiling our lib, not by external users of the lib headers, so it's not a problem to put it into config.h Also, this means all .c files of libs need to include config.h to get the export marker defined, so fix up a few that didn't include config.h. This commit depends on a common submodule commit that makes gst-glib-gen.mak add an #include "config.h" to generated enum/marshal .c files for the autotools build. https://bugzilla.gnome.org/show_bug.cgi?id=797185
2018-09-24 10:52:22 +00:00
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include <stdlib.h>
#include "mpegts.h"
#include "gstmpegts-private.h"
/**
* SECTION:gst-dvb-section
* @title: DVB variants of MPEG-TS sections
* @short_description: Sections for the various DVB specifications
* @include: gst/mpegts/mpegts.h
*
* The list of section types defined and used by the DVB specifications can be
* seen in %GstMpegtsSectionDVBTableID.
*
* # Supported DVB MPEG-TS sections
* These are the sections for which parsing and packetizing code exists.
*
* ## Network Information Table (NIT)
* See:
* * gst_mpegts_section_get_nit()
* * %GstMpegtsNIT
* * %GstMpegtsNITStream
* * gst_mpegts_nit_new()
*
* ## Service Description Table (SDT)
* See:
* * gst_mpegts_section_get_sdt()
* * %GstMpegtsSDT
* * %GstMpegtsSDTService
* * gst_mpegts_sdt_new()
*
* ## Bouquet Association Table (BAT)
* See:
* * gst_mpegts_section_get_bat()
* * %GstMpegtsBAT
* * %GstMpegtsBATStream
*
* ## Event Information Table (EIT)
* See:
* * gst_mpegts_section_get_eit()
* * %GstMpegtsEIT
* * %GstMpegtsEITEvent
*
* ## Time Date Table (TDT)
* See:
* * gst_mpegts_section_get_tdt()
*
* ## Time Offset Table (TOT)
* See:
* * gst_mpegts_section_get_tot()
* * %GstMpegtsTOT
*
* ## Selection Information Table (SIT)
* See:
* * gst_mpegts_section_get_sit()
* * %GstMpegtsSIT
* * %GstMpegtsSITService
*
* # API
*/
/*
* TODO
*
* * Check minimum size for section parsing in the various
* gst_mpegts_section_get_<tabld>() methods
*
* * Implement parsing code for
* * BAT
* * CAT
* * TSDT
*/
static inline GstDateTime *
_parse_utc_time (guint8 * data)
{
guint year, month, day, hour, minute, second;
guint16 mjd;
guint8 *utc_ptr;
mjd = GST_READ_UINT16_BE (data);
if (mjd == G_MAXUINT16)
return NULL;
/* See EN 300 468 Annex C */
year = (guint32) (((mjd - 15078.2) / 365.25));
month = (guint8) ((mjd - 14956.1 - (guint) (year * 365.25)) / 30.6001);
day = mjd - 14956 - (guint) (year * 365.25) - (guint) (month * 30.6001);
if (month == 14 || month == 15) {
year++;
month = month - 1 - 12;
} else {
month--;
}
year += 1900;
utc_ptr = data + 2;
/* First digit of hours cannot exceed 1 (max: 23 hours) */
hour = ((utc_ptr[0] & 0x30) >> 4) * 10 + (utc_ptr[0] & 0x0F);
/* First digit of minutes cannot exced 5 (max: 59 mins) */
minute = ((utc_ptr[1] & 0x70) >> 4) * 10 + (utc_ptr[1] & 0x0F);
/* first digit of seconds cannot exceed 5 (max: 59 seconds) */
second = ((utc_ptr[2] & 0x70) >> 4) * 10 + (utc_ptr[2] & 0x0F);
/* Time is UTC */
if (hour < 24 && minute < 60 && second < 60) {
return gst_date_time_new (0.0, year, month, day, hour, minute,
(gdouble) second);
} else if (utc_ptr[0] == 0xFF && utc_ptr[1] == 0xFF && utc_ptr[2] == 0xFF) {
return gst_date_time_new (0.0, year, month, day, -1, -1, -1);
}
return NULL;
}
/* Event Information Table */
static GstMpegtsEITEvent *
_gst_mpegts_eit_event_copy (GstMpegtsEITEvent * eit)
{
GstMpegtsEITEvent *copy;
copy = g_slice_dup (GstMpegtsEITEvent, eit);
copy->start_time = gst_date_time_ref (eit->start_time);
copy->descriptors = g_ptr_array_ref (eit->descriptors);
return copy;
}
static void
_gst_mpegts_eit_event_free (GstMpegtsEITEvent * eit)
{
if (eit->start_time)
gst_date_time_unref (eit->start_time);
if (eit->descriptors)
g_ptr_array_unref (eit->descriptors);
g_slice_free (GstMpegtsEITEvent, eit);
}
G_DEFINE_BOXED_TYPE (GstMpegtsEITEvent, gst_mpegts_eit_event,
(GBoxedCopyFunc) _gst_mpegts_eit_event_copy,
(GFreeFunc) _gst_mpegts_eit_event_free);
static GstMpegtsEIT *
_gst_mpegts_eit_copy (GstMpegtsEIT * eit)
{
GstMpegtsEIT *copy;
copy = g_slice_dup (GstMpegtsEIT, eit);
copy->events = g_ptr_array_ref (eit->events);
return copy;
}
static void
_gst_mpegts_eit_free (GstMpegtsEIT * eit)
{
g_ptr_array_unref (eit->events);
g_slice_free (GstMpegtsEIT, eit);
}
G_DEFINE_BOXED_TYPE (GstMpegtsEIT, gst_mpegts_eit,
(GBoxedCopyFunc) _gst_mpegts_eit_copy, (GFreeFunc) _gst_mpegts_eit_free);
static gpointer
_parse_eit (GstMpegtsSection * section)
{
GstMpegtsEIT *eit = NULL;
guint i = 0, allocated_events = 12;
guint8 *data, *end, *duration_ptr;
guint16 descriptors_loop_length;
eit = g_slice_new0 (GstMpegtsEIT);
data = section->data;
end = data + section->section_length;
/* Skip already parsed data */
data += 8;
eit->transport_stream_id = GST_READ_UINT16_BE (data);
data += 2;
eit->original_network_id = GST_READ_UINT16_BE (data);
data += 2;
eit->segment_last_section_number = *data++;
eit->last_table_id = *data++;
eit->actual_stream = (section->table_id == 0x4E ||
(section->table_id >= 0x50 && section->table_id <= 0x5F));
eit->present_following = (section->table_id == 0x4E
|| section->table_id == 0x4F);
eit->events =
g_ptr_array_new_full (allocated_events,
(GDestroyNotify) _gst_mpegts_eit_event_free);
while (data < end - 4) {
GstMpegtsEITEvent *event;
/* 12 is the minimum entry size + CRC */
if (end - data < 12 + 4) {
GST_WARNING ("PID %d invalid EIT entry length %d",
section->pid, (gint) (end - 4 - data));
goto error;
}
event = g_slice_new0 (GstMpegtsEITEvent);
g_ptr_array_add (eit->events, event);
event->event_id = GST_READ_UINT16_BE (data);
data += 2;
event->start_time = _parse_utc_time (data);
duration_ptr = data + 5;
event->duration = (((duration_ptr[0] & 0xF0) >> 4) * 10 +
(duration_ptr[0] & 0x0F)) * 60 * 60 +
(((duration_ptr[1] & 0xF0) >> 4) * 10 +
(duration_ptr[1] & 0x0F)) * 60 +
((duration_ptr[2] & 0xF0) >> 4) * 10 + (duration_ptr[2] & 0x0F);
data += 8;
event->running_status = *data >> 5;
event->free_CA_mode = (*data >> 4) & 0x01;
descriptors_loop_length = GST_READ_UINT16_BE (data) & 0x0FFF;
data += 2;
event->descriptors =
gst_mpegts_parse_descriptors (data, descriptors_loop_length);
if (event->descriptors == NULL)
goto error;
data += descriptors_loop_length;
i += 1;
}
if (data != end - 4) {
GST_WARNING ("PID %d invalid EIT parsed %d length %d",
section->pid, (gint) (data - section->data), section->section_length);
goto error;
}
return (gpointer) eit;
error:
if (eit)
_gst_mpegts_eit_free (eit);
return NULL;
}
/**
* gst_mpegts_section_get_eit:
* @section: a #GstMpegtsSection of type %GST_MPEGTS_SECTION_EIT
*
* Returns the #GstMpegtsEIT contained in the @section.
*
* Returns: The #GstMpegtsEIT contained in the section, or %NULL if an error
* happened.
*/
const GstMpegtsEIT *
gst_mpegts_section_get_eit (GstMpegtsSection * section)
{
g_return_val_if_fail (section->section_type == GST_MPEGTS_SECTION_EIT, NULL);
g_return_val_if_fail (section->cached_parsed || section->data, NULL);
if (!section->cached_parsed)
section->cached_parsed = __common_section_checks (section, 18, _parse_eit,
(GDestroyNotify) _gst_mpegts_eit_free);
return (const GstMpegtsEIT *) section->cached_parsed;
}
/* Bouquet Association Table */
static GstMpegtsBATStream *
_gst_mpegts_bat_stream_copy (GstMpegtsBATStream * bat)
{
GstMpegtsBATStream *copy;
copy = g_slice_dup (GstMpegtsBATStream, bat);
copy->descriptors = g_ptr_array_ref (bat->descriptors);
return copy;
}
static void
_gst_mpegts_bat_stream_free (GstMpegtsBATStream * bat)
{
if (bat->descriptors)
g_ptr_array_unref (bat->descriptors);
g_slice_free (GstMpegtsBATStream, bat);
}
G_DEFINE_BOXED_TYPE (GstMpegtsBATStream, gst_mpegts_bat_stream,
(GBoxedCopyFunc) _gst_mpegts_bat_stream_copy,
(GFreeFunc) _gst_mpegts_bat_stream_free);
static GstMpegtsBAT *
_gst_mpegts_bat_copy (GstMpegtsBAT * bat)
{
GstMpegtsBAT *copy;
copy = g_slice_dup (GstMpegtsBAT, bat);
copy->descriptors = g_ptr_array_ref (bat->descriptors);
copy->streams = g_ptr_array_ref (bat->streams);
return copy;
}
static void
_gst_mpegts_bat_free (GstMpegtsBAT * bat)
{
if (bat->descriptors)
g_ptr_array_unref (bat->descriptors);
if (bat->streams)
g_ptr_array_unref (bat->streams);
g_slice_free (GstMpegtsBAT, bat);
}
G_DEFINE_BOXED_TYPE (GstMpegtsBAT, gst_mpegts_bat,
(GBoxedCopyFunc) _gst_mpegts_bat_copy, (GFreeFunc) _gst_mpegts_bat_free);
static gpointer
_parse_bat (GstMpegtsSection * section)
{
GstMpegtsBAT *bat = NULL;
guint i = 0, allocated_streams = 12;
guint8 *data, *end, *entry_begin;
guint16 descriptors_loop_length, transport_stream_loop_length;
GST_DEBUG ("BAT");
bat = g_slice_new0 (GstMpegtsBAT);
data = section->data;
end = data + section->section_length;
/* Skip already parsed data */
data += 8;
descriptors_loop_length = GST_READ_UINT16_BE (data) & 0x0FFF;
data += 2;
/* see if the buffer is large enough */
if (descriptors_loop_length && (data + descriptors_loop_length > end - 4)) {
GST_WARNING ("PID %d invalid BAT descriptors loop length %d",
section->pid, descriptors_loop_length);
goto error;
}
bat->descriptors =
gst_mpegts_parse_descriptors (data, descriptors_loop_length);
if (bat->descriptors == NULL)
goto error;
data += descriptors_loop_length;
transport_stream_loop_length = GST_READ_UINT16_BE (data) & 0x0FFF;
data += 2;
if (G_UNLIKELY (transport_stream_loop_length > (end - 4 - data))) {
GST_WARNING
("PID 0x%04x invalid BAT (transport_stream_loop_length too big)",
section->pid);
goto error;
}
bat->streams =
g_ptr_array_new_full (allocated_streams,
(GDestroyNotify) _gst_mpegts_bat_stream_free);
/* read up to the CRC */
while (transport_stream_loop_length - 4 > 0) {
GstMpegtsBATStream *stream = g_slice_new0 (GstMpegtsBATStream);
g_ptr_array_add (bat->streams, stream);
if (transport_stream_loop_length < 6) {
/* each entry must be at least 6 bytes (+ 4 bytes CRC) */
GST_WARNING ("PID %d invalid BAT entry size %d",
section->pid, transport_stream_loop_length);
goto error;
}
entry_begin = data;
stream->transport_stream_id = GST_READ_UINT16_BE (data);
data += 2;
stream->original_network_id = GST_READ_UINT16_BE (data);
data += 2;
descriptors_loop_length = GST_READ_UINT16_BE (data) & 0x0FFF;
data += 2;
GST_DEBUG ("descriptors_loop_length %d", descriptors_loop_length);
if (descriptors_loop_length && (data + descriptors_loop_length > end - 4)) {
GST_WARNING
("PID %d invalid BAT entry %d descriptors loop length %d (only have %"
G_GSIZE_FORMAT ")", section->pid, section->subtable_extension,
descriptors_loop_length, (gsize) (end - 4 - data));
goto error;
}
stream->descriptors =
gst_mpegts_parse_descriptors (data, descriptors_loop_length);
if (stream->descriptors == NULL)
goto error;
data += descriptors_loop_length;
i += 1;
transport_stream_loop_length -= data - entry_begin;
}
if (data != end - 4) {
GST_WARNING ("PID %d invalid BAT parsed %d length %d",
section->pid, (gint) (data - section->data), section->section_length);
goto error;
}
return (gpointer) bat;
error:
if (bat)
_gst_mpegts_bat_free (bat);
return NULL;
}
/**
* gst_mpegts_section_get_bat:
* @section: a #GstMpegtsSection of type %GST_MPEGTS_SECTION_BAT
*
* Returns the #GstMpegtsBAT contained in the @section.
*
* Returns: The #GstMpegtsBAT contained in the section, or %NULL if an error
* happened.
*/
const GstMpegtsBAT *
gst_mpegts_section_get_bat (GstMpegtsSection * section)
{
g_return_val_if_fail (section->section_type == GST_MPEGTS_SECTION_BAT, NULL);
g_return_val_if_fail (section->cached_parsed || section->data, NULL);
if (!section->cached_parsed)
section->cached_parsed =
__common_section_checks (section, 16, _parse_bat,
(GDestroyNotify) _gst_mpegts_bat_free);
return (const GstMpegtsBAT *) section->cached_parsed;
}
/* Network Information Table */
static GstMpegtsNITStream *
_gst_mpegts_nit_stream_copy (GstMpegtsNITStream * nit)
{
GstMpegtsNITStream *copy;
copy = g_slice_dup (GstMpegtsNITStream, nit);
copy->descriptors = g_ptr_array_ref (nit->descriptors);
return copy;
}
static void
_gst_mpegts_nit_stream_free (GstMpegtsNITStream * nit)
{
if (nit->descriptors)
g_ptr_array_unref (nit->descriptors);
g_slice_free (GstMpegtsNITStream, nit);
}
G_DEFINE_BOXED_TYPE (GstMpegtsNITStream, gst_mpegts_nit_stream,
(GBoxedCopyFunc) _gst_mpegts_nit_stream_copy,
(GFreeFunc) _gst_mpegts_nit_stream_free);
static GstMpegtsNIT *
_gst_mpegts_nit_copy (GstMpegtsNIT * nit)
{
GstMpegtsNIT *copy = g_slice_dup (GstMpegtsNIT, nit);
copy->descriptors = g_ptr_array_ref (nit->descriptors);
copy->streams = g_ptr_array_ref (nit->streams);
return copy;
}
static void
_gst_mpegts_nit_free (GstMpegtsNIT * nit)
{
if (nit->descriptors)
g_ptr_array_unref (nit->descriptors);
g_ptr_array_unref (nit->streams);
g_slice_free (GstMpegtsNIT, nit);
}
G_DEFINE_BOXED_TYPE (GstMpegtsNIT, gst_mpegts_nit,
(GBoxedCopyFunc) _gst_mpegts_nit_copy, (GFreeFunc) _gst_mpegts_nit_free);
static gpointer
_parse_nit (GstMpegtsSection * section)
{
GstMpegtsNIT *nit = NULL;
guint i = 0, allocated_streams = 12;
guint8 *data, *end, *entry_begin;
guint16 descriptors_loop_length, transport_stream_loop_length;
GST_DEBUG ("NIT");
nit = g_slice_new0 (GstMpegtsNIT);
data = section->data;
end = data + section->section_length;
/* Set network id, and skip the rest of what is already parsed */
nit->network_id = section->subtable_extension;
data += 8;
nit->actual_network = section->table_id == 0x40;
descriptors_loop_length = GST_READ_UINT16_BE (data) & 0x0FFF;
data += 2;
/* see if the buffer is large enough */
if (descriptors_loop_length && (data + descriptors_loop_length > end - 4)) {
GST_WARNING ("PID %d invalid NIT descriptors loop length %d",
section->pid, descriptors_loop_length);
goto error;
}
nit->descriptors =
gst_mpegts_parse_descriptors (data, descriptors_loop_length);
if (nit->descriptors == NULL)
goto error;
data += descriptors_loop_length;
transport_stream_loop_length = GST_READ_UINT16_BE (data) & 0x0FFF;
data += 2;
if (G_UNLIKELY (transport_stream_loop_length > (end - 4 - data))) {
GST_WARNING
("PID 0x%04x invalid NIT (transport_stream_loop_length too big)",
section->pid);
goto error;
}
nit->streams =
g_ptr_array_new_full (allocated_streams,
(GDestroyNotify) _gst_mpegts_nit_stream_free);
/* read up to the CRC */
while (transport_stream_loop_length - 4 > 0) {
GstMpegtsNITStream *stream = g_slice_new0 (GstMpegtsNITStream);
g_ptr_array_add (nit->streams, stream);
if (transport_stream_loop_length < 6) {
/* each entry must be at least 6 bytes (+ 4 bytes CRC) */
GST_WARNING ("PID %d invalid NIT entry size %d",
section->pid, transport_stream_loop_length);
goto error;
}
entry_begin = data;
stream->transport_stream_id = GST_READ_UINT16_BE (data);
data += 2;
stream->original_network_id = GST_READ_UINT16_BE (data);
data += 2;
descriptors_loop_length = GST_READ_UINT16_BE (data) & 0x0FFF;
data += 2;
GST_DEBUG ("descriptors_loop_length %d", descriptors_loop_length);
if (descriptors_loop_length && (data + descriptors_loop_length > end - 4)) {
GST_WARNING
("PID %d invalid NIT entry %d descriptors loop length %d (only have %"
G_GSIZE_FORMAT ")", section->pid, section->subtable_extension,
descriptors_loop_length, (gsize) (end - 4 - data));
goto error;
}
stream->descriptors =
gst_mpegts_parse_descriptors (data, descriptors_loop_length);
if (stream->descriptors == NULL)
goto error;
data += descriptors_loop_length;
i += 1;
transport_stream_loop_length -= data - entry_begin;
}
if (data != end - 4) {
GST_WARNING ("PID %d invalid NIT parsed %d length %d",
section->pid, (gint) (data - section->data), section->section_length);
goto error;
}
return (gpointer) nit;
error:
if (nit)
_gst_mpegts_nit_free (nit);
return NULL;
}
/**
* gst_mpegts_section_get_nit:
* @section: a #GstMpegtsSection of type %GST_MPEGTS_SECTION_NIT
*
* Returns the #GstMpegtsNIT contained in the @section.
*
* Returns: The #GstMpegtsNIT contained in the section, or %NULL if an error
* happened.
*/
const GstMpegtsNIT *
gst_mpegts_section_get_nit (GstMpegtsSection * section)
{
g_return_val_if_fail (section->section_type == GST_MPEGTS_SECTION_NIT, NULL);
g_return_val_if_fail (section->cached_parsed || section->data, NULL);
if (!section->cached_parsed)
section->cached_parsed =
__common_section_checks (section, 16, _parse_nit,
(GDestroyNotify) _gst_mpegts_nit_free);
return (const GstMpegtsNIT *) section->cached_parsed;
}
/**
* gst_mpegts_nit_new:
*
* Allocates and initializes a #GstMpegtsNIT.
*
* Returns: (transfer full): A newly allocated #GstMpegtsNIT
*/
GstMpegtsNIT *
gst_mpegts_nit_new (void)
{
GstMpegtsNIT *nit;
nit = g_slice_new0 (GstMpegtsNIT);
nit->descriptors = g_ptr_array_new_with_free_func ((GDestroyNotify)
gst_mpegts_descriptor_free);
nit->streams = g_ptr_array_new_with_free_func ((GDestroyNotify)
_gst_mpegts_nit_stream_free);
return nit;
}
/**
* gst_mpegts_nit_stream_new:
*
* Allocates and initializes a #GstMpegtsNITStream
*
* Returns: (transfer full): A newly allocated #GstMpegtsNITStream
*/
GstMpegtsNITStream *
gst_mpegts_nit_stream_new (void)
{
GstMpegtsNITStream *stream;
stream = g_slice_new0 (GstMpegtsNITStream);
stream->descriptors = g_ptr_array_new_with_free_func (
(GDestroyNotify) gst_mpegts_descriptor_free);
return stream;
}
static gboolean
_packetize_nit (GstMpegtsSection * section)
{
gsize length, network_length, loop_length;
const GstMpegtsNIT *nit;
GstMpegtsNITStream *stream;
GstMpegtsDescriptor *descriptor;
guint i, j;
guint8 *data, *pos;
nit = gst_mpegts_section_get_nit (section);
if (nit == NULL)
return FALSE;
/* 8 byte common section fields
2 byte network_descriptors_length
2 byte transport_stream_loop_length
4 byte CRC */
length = 16;
/* Find length of network descriptors */
network_length = 0;
if (nit->descriptors) {
for (i = 0; i < nit->descriptors->len; i++) {
descriptor = g_ptr_array_index (nit->descriptors, i);
network_length += descriptor->length + 2;
}
}
/* Find length of loop */
loop_length = 0;
if (nit->streams) {
for (i = 0; i < nit->streams->len; i++) {
stream = g_ptr_array_index (nit->streams, i);
loop_length += 6;
if (stream->descriptors) {
for (j = 0; j < stream->descriptors->len; j++) {
descriptor = g_ptr_array_index (stream->descriptors, j);
loop_length += descriptor->length + 2;
}
}
}
}
length += network_length + loop_length;
/* Max length of NIT section is 1024 bytes */
g_return_val_if_fail (length <= 1024, FALSE);
_packetize_common_section (section, length);
data = section->data + 8;
/* reserved - 4 bit
network_descriptors_length - 12 bit uimsbf */
GST_WRITE_UINT16_BE (data, network_length | 0xF000);
data += 2;
_packetize_descriptor_array (nit->descriptors, &data);
/* reserved - 4 bit
transport_stream_loop_length - 12 bit uimsbf */
GST_WRITE_UINT16_BE (data, loop_length | 0xF000);
data += 2;
if (nit->streams) {
for (i = 0; i < nit->streams->len; i++) {
stream = g_ptr_array_index (nit->streams, i);
/* transport_stream_id - 16 bit uimsbf */
GST_WRITE_UINT16_BE (data, stream->transport_stream_id);
data += 2;
/* original_network_id - 16 bit uimsbf */
GST_WRITE_UINT16_BE (data, stream->original_network_id);
data += 2;
/* reserved - 4 bit
transport_descriptors_length - 12 bit uimsbf
Set length to zero, and update in loop */
pos = data;
*data++ = 0xF0;
*data++ = 0x00;
_packetize_descriptor_array (stream->descriptors, &data);
/* Go back and update the descriptor length */
GST_WRITE_UINT16_BE (pos, (data - pos - 2) | 0xF000);
}
}
return TRUE;
}
/**
* gst_mpegts_section_from_nit:
* @nit: (transfer full): a #GstMpegtsNIT to create the #GstMpegtsSection from
*
* Ownership of @nit is taken. The data in @nit is managed by the #GstMpegtsSection
*
* Returns: (transfer full): the #GstMpegtsSection
*/
GstMpegtsSection *
gst_mpegts_section_from_nit (GstMpegtsNIT * nit)
{
GstMpegtsSection *section;
g_return_val_if_fail (nit != NULL, NULL);
if (nit->actual_network)
section = _gst_mpegts_section_init (0x10,
GST_MTS_TABLE_ID_NETWORK_INFORMATION_ACTUAL_NETWORK);
else
section = _gst_mpegts_section_init (0x10,
GST_MTS_TABLE_ID_NETWORK_INFORMATION_OTHER_NETWORK);
section->subtable_extension = nit->network_id;
section->cached_parsed = (gpointer) nit;
section->packetizer = _packetize_nit;
section->destroy_parsed = (GDestroyNotify) _gst_mpegts_nit_free;
return section;
}
/* Service Description Table (SDT) */
static GstMpegtsSDTService *
_gst_mpegts_sdt_service_copy (GstMpegtsSDTService * sdt)
{
GstMpegtsSDTService *copy = g_slice_dup (GstMpegtsSDTService, sdt);
copy->descriptors = g_ptr_array_ref (sdt->descriptors);
return copy;
}
static void
_gst_mpegts_sdt_service_free (GstMpegtsSDTService * sdt)
{
if (sdt->descriptors)
g_ptr_array_unref (sdt->descriptors);
g_slice_free (GstMpegtsSDTService, sdt);
}
G_DEFINE_BOXED_TYPE (GstMpegtsSDTService, gst_mpegts_sdt_service,
(GBoxedCopyFunc) _gst_mpegts_sdt_service_copy,
(GFreeFunc) _gst_mpegts_sdt_service_free);
static GstMpegtsSDT *
_gst_mpegts_sdt_copy (GstMpegtsSDT * sdt)
{
GstMpegtsSDT *copy = g_slice_dup (GstMpegtsSDT, sdt);
copy->services = g_ptr_array_ref (sdt->services);
return copy;
}
static void
_gst_mpegts_sdt_free (GstMpegtsSDT * sdt)
{
g_ptr_array_unref (sdt->services);
g_slice_free (GstMpegtsSDT, sdt);
}
G_DEFINE_BOXED_TYPE (GstMpegtsSDT, gst_mpegts_sdt,
(GBoxedCopyFunc) _gst_mpegts_sdt_copy, (GFreeFunc) _gst_mpegts_sdt_free);
static gpointer
_parse_sdt (GstMpegtsSection * section)
{
GstMpegtsSDT *sdt = NULL;
guint i = 0, allocated_services = 8;
guint8 *data, *end, *entry_begin;
guint tmp;
guint sdt_info_length;
guint descriptors_loop_length;
GST_DEBUG ("SDT");
sdt = g_slice_new0 (GstMpegtsSDT);
data = section->data;
end = data + section->section_length;
sdt->transport_stream_id = section->subtable_extension;
/* Skip common fields */
data += 8;
sdt->original_network_id = GST_READ_UINT16_BE (data);
data += 2;
/* skip reserved byte */
data += 1;
sdt->actual_ts = section->table_id == 0x42;
sdt_info_length = section->section_length - 11;
sdt->services = g_ptr_array_new_full (allocated_services,
(GDestroyNotify) _gst_mpegts_sdt_service_free);
/* read up to the CRC */
while (sdt_info_length - 4 > 0) {
GstMpegtsSDTService *service = g_slice_new0 (GstMpegtsSDTService);
g_ptr_array_add (sdt->services, service);
entry_begin = data;
if (sdt_info_length - 4 < 5) {
/* each entry must be at least 5 bytes (+4 bytes for the CRC) */
GST_WARNING ("PID %d invalid SDT entry size %d",
section->pid, sdt_info_length);
goto error;
}
service->service_id = GST_READ_UINT16_BE (data);
data += 2;
service->EIT_schedule_flag = ((*data & 0x02) == 2);
service->EIT_present_following_flag = (*data & 0x01) == 1;
data += 1;
tmp = GST_READ_UINT16_BE (data);
service->running_status = (*data >> 5) & 0x07;
service->free_CA_mode = (*data >> 4) & 0x01;
descriptors_loop_length = tmp & 0x0FFF;
data += 2;
if (descriptors_loop_length && (data + descriptors_loop_length > end - 4)) {
GST_WARNING ("PID %d invalid SDT entry %d descriptors loop length %d",
section->pid, service->service_id, descriptors_loop_length);
goto error;
}
service->descriptors =
gst_mpegts_parse_descriptors (data, descriptors_loop_length);
if (!service->descriptors)
goto error;
data += descriptors_loop_length;
sdt_info_length -= data - entry_begin;
i += 1;
}
if (data != end - 4) {
GST_WARNING ("PID %d invalid SDT parsed %d length %d",
section->pid, (gint) (data - section->data), section->section_length);
goto error;
}
return sdt;
error:
if (sdt)
_gst_mpegts_sdt_free (sdt);
return NULL;
}
/**
* gst_mpegts_section_get_sdt:
* @section: a #GstMpegtsSection of type %GST_MPEGTS_SECTION_SDT
*
* Returns the #GstMpegtsSDT contained in the @section.
*
* Returns: The #GstMpegtsSDT contained in the section, or %NULL if an error
* happened.
*/
const GstMpegtsSDT *
gst_mpegts_section_get_sdt (GstMpegtsSection * section)
{
g_return_val_if_fail (section->section_type == GST_MPEGTS_SECTION_SDT, NULL);
g_return_val_if_fail (section->cached_parsed || section->data, NULL);
if (!section->cached_parsed)
section->cached_parsed =
__common_section_checks (section, 15, _parse_sdt,
(GDestroyNotify) _gst_mpegts_sdt_free);
return (const GstMpegtsSDT *) section->cached_parsed;
}
/**
* gst_mpegts_sdt_new:
*
* Allocates and initializes a #GstMpegtsSDT.
*
* Returns: (transfer full): A newly allocated #GstMpegtsSDT
*/
GstMpegtsSDT *
gst_mpegts_sdt_new (void)
{
GstMpegtsSDT *sdt;
sdt = g_slice_new0 (GstMpegtsSDT);
sdt->services = g_ptr_array_new_with_free_func ((GDestroyNotify)
_gst_mpegts_sdt_service_free);
return sdt;
}
/**
* gst_mpegts_sdt_service_new:
*
* Allocates and initializes a #GstMpegtsSDTService.
*
* Returns: (transfer full): A newly allocated #GstMpegtsSDTService
*/
GstMpegtsSDTService *
gst_mpegts_sdt_service_new (void)
{
GstMpegtsSDTService *service;
service = g_slice_new0 (GstMpegtsSDTService);
service->descriptors = g_ptr_array_new_with_free_func ((GDestroyNotify)
gst_mpegts_descriptor_free);
return service;
}
static gboolean
_packetize_sdt (GstMpegtsSection * section)
{
gsize length, service_length;
const GstMpegtsSDT *sdt;
GstMpegtsSDTService *service;
GstMpegtsDescriptor *descriptor;
guint i, j;
guint8 *data, *pos;
sdt = gst_mpegts_section_get_sdt (section);
if (sdt == NULL)
return FALSE;
/* 8 byte common section fields
2 byte original_network_id
1 byte reserved
4 byte CRC */
length = 15;
/* Find length of services */
service_length = 0;
if (sdt->services) {
for (i = 0; i < sdt->services->len; i++) {
service = g_ptr_array_index (sdt->services, i);
service_length += 5;
if (service->descriptors) {
for (j = 0; j < service->descriptors->len; j++) {
descriptor = g_ptr_array_index (service->descriptors, j);
service_length += descriptor->length + 2;
}
}
}
}
length += service_length;
/* Max length if SDT section is 1024 bytes */
g_return_val_if_fail (length <= 1024, FALSE);
_packetize_common_section (section, length);
data = section->data + 8;
/* original_network_id - 16 bit uimsbf */
GST_WRITE_UINT16_BE (data, sdt->original_network_id);
data += 2;
/* reserved - 8 bit */
*data++ = 0xFF;
if (sdt->services) {
for (i = 0; i < sdt->services->len; i++) {
service = g_ptr_array_index (sdt->services, i);
/* service_id - 16 bit uimsbf */
GST_WRITE_UINT16_BE (data, service->service_id);
data += 2;
/* reserved - 6 bit
EIT_schedule_flag - 1 bit
EIT_present_following_flag - 1 bit */
*data = 0xFC;
if (service->EIT_schedule_flag)
*data |= 0x02;
if (service->EIT_present_following_flag)
*data |= 0x01;
data++;
/* running_status - 3 bit uimsbf
free_CA_mode - 1 bit
descriptors_loop_length - 12 bit uimsbf */
/* Set length to zero for now */
pos = data;
*data++ = 0x00;
*data++ = 0x00;
_packetize_descriptor_array (service->descriptors, &data);
/* Go back and update the descriptor length */
GST_WRITE_UINT16_BE (pos, data - pos - 2);
*pos |= service->running_status << 5;
if (service->free_CA_mode)
*pos |= 0x10;
}
}
return TRUE;
}
/**
* gst_mpegts_section_from_sdt:
* @sdt: (transfer full): a #GstMpegtsSDT to create the #GstMpegtsSection from
*
* Ownership of @sdt is taken. The data in @sdt is managed by the #GstMpegtsSection
*
* Returns: (transfer full): the #GstMpegtsSection
*/
GstMpegtsSection *
gst_mpegts_section_from_sdt (GstMpegtsSDT * sdt)
{
GstMpegtsSection *section;
g_return_val_if_fail (sdt != NULL, NULL);
if (sdt->actual_ts)
section = _gst_mpegts_section_init (0x11,
GST_MTS_TABLE_ID_SERVICE_DESCRIPTION_ACTUAL_TS);
else
section = _gst_mpegts_section_init (0x11,
GST_MTS_TABLE_ID_SERVICE_DESCRIPTION_OTHER_TS);
section->subtable_extension = sdt->transport_stream_id;
section->cached_parsed = (gpointer) sdt;
section->packetizer = _packetize_sdt;
section->destroy_parsed = (GDestroyNotify) _gst_mpegts_sdt_free;
return section;
}
/* Time and Date Table (TDT) */
static gpointer
_parse_tdt (GstMpegtsSection * section)
{
return (gpointer) _parse_utc_time (section->data + 3);
}
/**
* gst_mpegts_section_get_tdt:
* @section: a #GstMpegtsSection of type %GST_MPEGTS_SECTION_TDT
*
* Returns the #GstDateTime of the TDT
*
* Returns: The #GstDateTime contained in the section, or %NULL
* if an error happened. Release with #gst_date_time_unref when done.
*/
GstDateTime *
gst_mpegts_section_get_tdt (GstMpegtsSection * section)
{
g_return_val_if_fail (section->section_type == GST_MPEGTS_SECTION_TDT, NULL);
g_return_val_if_fail (section->cached_parsed || section->data, NULL);
if (!section->cached_parsed)
section->cached_parsed =
__common_section_checks (section, 8, _parse_tdt,
(GDestroyNotify) gst_date_time_unref);
if (section->cached_parsed)
return gst_date_time_ref ((GstDateTime *) section->cached_parsed);
return NULL;
}
/* Time Offset Table (TOT) */
static GstMpegtsTOT *
_gst_mpegts_tot_copy (GstMpegtsTOT * tot)
{
GstMpegtsTOT *copy = g_slice_dup (GstMpegtsTOT, tot);
if (tot->utc_time)
copy->utc_time = gst_date_time_ref (tot->utc_time);
copy->descriptors = g_ptr_array_ref (tot->descriptors);
return copy;
}
static void
_gst_mpegts_tot_free (GstMpegtsTOT * tot)
{
if (tot->utc_time)
gst_date_time_unref (tot->utc_time);
if (tot->descriptors)
g_ptr_array_unref (tot->descriptors);
g_slice_free (GstMpegtsTOT, tot);
}
G_DEFINE_BOXED_TYPE (GstMpegtsTOT, gst_mpegts_tot,
(GBoxedCopyFunc) _gst_mpegts_tot_copy, (GFreeFunc) _gst_mpegts_tot_free);
static gpointer
_parse_tot (GstMpegtsSection * section)
{
guint8 *data;
GstMpegtsTOT *tot;
guint16 desc_len;
GST_DEBUG ("TOT");
tot = g_slice_new0 (GstMpegtsTOT);
tot->utc_time = _parse_utc_time (section->data + 3);
/* Skip 5 bytes from utc_time (+3 of initial offset) */
data = section->data + 8;
desc_len = GST_READ_UINT16_BE (data) & 0xFFF;
data += 2;
tot->descriptors = gst_mpegts_parse_descriptors (data, desc_len);
return (gpointer) tot;
}
/**
* gst_mpegts_section_get_tot:
* @section: a #GstMpegtsSection of type %GST_MPEGTS_SECTION_TOT
*
* Returns the #GstMpegtsTOT contained in the @section.
*
* Returns: The #GstMpegtsTOT contained in the section, or %NULL if an error
* happened.
*/
const GstMpegtsTOT *
gst_mpegts_section_get_tot (GstMpegtsSection * section)
{
g_return_val_if_fail (section->section_type == GST_MPEGTS_SECTION_TOT, NULL);
g_return_val_if_fail (section->cached_parsed || section->data, NULL);
if (!section->cached_parsed)
section->cached_parsed =
__common_section_checks (section, 14, _parse_tot,
(GDestroyNotify) _gst_mpegts_tot_free);
return (const GstMpegtsTOT *) section->cached_parsed;
}
/* Selection Information Table (SIT) */
static GstMpegtsSITService *
_gst_mpegts_sit_service_copy (GstMpegtsSITService * sit)
{
GstMpegtsSITService *copy = g_slice_dup (GstMpegtsSITService, sit);
copy->service_id = sit->service_id;
copy->running_status = sit->running_status;
copy->descriptors = g_ptr_array_ref (sit->descriptors);
return copy;
}
static void
_gst_mpegts_sit_service_free (GstMpegtsSITService * sit)
{
if (sit->descriptors)
g_ptr_array_unref (sit->descriptors);
g_slice_free (GstMpegtsSITService, sit);
}
G_DEFINE_BOXED_TYPE (GstMpegtsSITService, gst_mpegts_sit_service,
(GBoxedCopyFunc) _gst_mpegts_sit_service_copy,
(GFreeFunc) _gst_mpegts_sit_service_free);
static GstMpegtsSIT *
_gst_mpegts_sit_copy (GstMpegtsSIT * sit)
{
GstMpegtsSIT *copy = g_slice_dup (GstMpegtsSIT, sit);
copy->services = g_ptr_array_ref (sit->services);
copy->descriptors = g_ptr_array_ref (sit->descriptors);
return copy;
}
static void
_gst_mpegts_sit_free (GstMpegtsSIT * sit)
{
g_ptr_array_unref (sit->services);
g_ptr_array_unref (sit->descriptors);
g_slice_free (GstMpegtsSIT, sit);
}
G_DEFINE_BOXED_TYPE (GstMpegtsSIT, gst_mpegts_sit,
(GBoxedCopyFunc) _gst_mpegts_sit_copy, (GFreeFunc) _gst_mpegts_sit_free);
static gpointer
_parse_sit (GstMpegtsSection * section)
{
GstMpegtsSIT *sit = NULL;
guint i = 0, allocated_services = 8;
guint8 *data, *end, *entry_begin;
guint sit_info_length;
guint descriptors_loop_length;
GST_DEBUG ("SIT");
sit = g_slice_new0 (GstMpegtsSIT);
data = section->data;
end = data + section->section_length;
/* Skip common fields */
data += 8;
descriptors_loop_length = GST_READ_UINT16_BE (data) & 0x0fff;
data += 2;
sit->descriptors =
gst_mpegts_parse_descriptors (data, descriptors_loop_length);
if (sit->descriptors == NULL)
goto error;
data += descriptors_loop_length;
sit_info_length = end - data;;
sit->services = g_ptr_array_new_full (allocated_services,
(GDestroyNotify) _gst_mpegts_sit_service_free);
/* read up to the CRC */
while (sit_info_length - 4 > 0) {
GstMpegtsSITService *service = g_slice_new0 (GstMpegtsSITService);
g_ptr_array_add (sit->services, service);
entry_begin = data;
if (sit_info_length - 4 < 4) {
/* each entry must be at least 4 bytes (+4 bytes for the CRC) */
GST_WARNING ("PID %d invalid SIT entry size %d",
section->pid, sit_info_length);
goto error;
}
service->service_id = GST_READ_UINT16_BE (data);
data += 2;
service->running_status = (*data >> 5) & 0x07;
descriptors_loop_length = GST_READ_UINT16_BE (data) & 0x0fff;
data += 2;
if (descriptors_loop_length && (data + descriptors_loop_length > end - 4)) {
GST_WARNING ("PID %d invalid SIT entry %d descriptors loop length %d",
section->pid, service->service_id, descriptors_loop_length);
goto error;
}
service->descriptors =
gst_mpegts_parse_descriptors (data, descriptors_loop_length);
if (!service->descriptors)
goto error;
data += descriptors_loop_length;
sit_info_length -= data - entry_begin;
i += 1;
}
if (data != end - 4) {
GST_WARNING ("PID %d invalid SIT parsed %d length %d",
section->pid, (gint) (data - section->data), section->section_length);
goto error;
}
return sit;
error:
if (sit)
_gst_mpegts_sit_free (sit);
return NULL;
}
/**
* gst_mpegts_section_get_sit:
* @section: a #GstMpegtsSection of type %GST_MPEGTS_SECTION_SIT
*
* Returns the #GstMpegtsSIT contained in the @section.
*
* Returns: The #GstMpegtsSIT contained in the section, or %NULL if an error
* happened.
*
* Since: 1.20
*/
const GstMpegtsSIT *
gst_mpegts_section_get_sit (GstMpegtsSection * section)
{
g_return_val_if_fail (section->section_type == GST_MPEGTS_SECTION_SIT, NULL);
g_return_val_if_fail (section->cached_parsed || section->data, NULL);
if (!section->cached_parsed)
section->cached_parsed =
__common_section_checks (section, 18, _parse_sit,
(GDestroyNotify) _gst_mpegts_sit_free);
return (const GstMpegtsSIT *) section->cached_parsed;
}