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gstreamer/gst-libs/gst/mpegts/gstmpegtssection.c
Edward Hervey c1366efcd6 libs/mpegts: Rename GstMpegTS => GstMpegTs 
Sorry for this :( But this makes it more in sync with expected type
naming in gobject (i.e. CamelCase and not CamelMAYBECase).

Also split descriptor type enums into the different variants:
* ISO H.222.0 / 13818-1 (i.e. standard mpeg-ts)
* DVB
* ATSC
* ISDB
* miscellaneous

This will avoid future clashes when specs use the same descriptor type
2013-07-03 13:59:56 +02:00

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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 softwagre; 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.
*/
#include <string.h>
#include <stdlib.h>
#include "mpegts.h"
#include "gstmpegts-private.h"
/**
* SECTION:gstmpegtssection
* @short_description: Convenience library for using MPEG-TS sections
*
* For more details, refer to the ITU H.222.0 or ISO/IEC 13818-1 specifications
* and other specifications mentionned in the documentation.
*/
/*
* TODO
*
* * Check minimum size for section parsing in the various
* gst_mpegts_section_get_<tabld>() methods
*
* * Implement parsing code for
* * BAT
* * CAT
* * TSDT
*/
GST_DEBUG_CATEGORY (gst_mpegts_debug);
static GQuark QUARK_PAT;
static GQuark QUARK_CAT;
static GQuark QUARK_BAT;
static GQuark QUARK_PMT;
static GQuark QUARK_NIT;
static GQuark QUARK_SDT;
static GQuark QUARK_EIT;
static GQuark QUARK_TDT;
static GQuark QUARK_TOT;
static GQuark QUARK_SECTION;
static GType _gst_mpegts_section_type = 0;
#define MPEG_TYPE_TS_SECTION (_gst_mpegts_section_type)
GST_DEFINE_MINI_OBJECT_TYPE (GstMpegTsSection, gst_mpegts_section);
static const guint32 crc_tab[256] = {
0x00000000, 0x04c11db7, 0x09823b6e, 0x0d4326d9, 0x130476dc, 0x17c56b6b,
0x1a864db2, 0x1e475005, 0x2608edb8, 0x22c9f00f, 0x2f8ad6d6, 0x2b4bcb61,
0x350c9b64, 0x31cd86d3, 0x3c8ea00a, 0x384fbdbd, 0x4c11db70, 0x48d0c6c7,
0x4593e01e, 0x4152fda9, 0x5f15adac, 0x5bd4b01b, 0x569796c2, 0x52568b75,
0x6a1936c8, 0x6ed82b7f, 0x639b0da6, 0x675a1011, 0x791d4014, 0x7ddc5da3,
0x709f7b7a, 0x745e66cd, 0x9823b6e0, 0x9ce2ab57, 0x91a18d8e, 0x95609039,
0x8b27c03c, 0x8fe6dd8b, 0x82a5fb52, 0x8664e6e5, 0xbe2b5b58, 0xbaea46ef,
0xb7a96036, 0xb3687d81, 0xad2f2d84, 0xa9ee3033, 0xa4ad16ea, 0xa06c0b5d,
0xd4326d90, 0xd0f37027, 0xddb056fe, 0xd9714b49, 0xc7361b4c, 0xc3f706fb,
0xceb42022, 0xca753d95, 0xf23a8028, 0xf6fb9d9f, 0xfbb8bb46, 0xff79a6f1,
0xe13ef6f4, 0xe5ffeb43, 0xe8bccd9a, 0xec7dd02d, 0x34867077, 0x30476dc0,
0x3d044b19, 0x39c556ae, 0x278206ab, 0x23431b1c, 0x2e003dc5, 0x2ac12072,
0x128e9dcf, 0x164f8078, 0x1b0ca6a1, 0x1fcdbb16, 0x018aeb13, 0x054bf6a4,
0x0808d07d, 0x0cc9cdca, 0x7897ab07, 0x7c56b6b0, 0x71159069, 0x75d48dde,
0x6b93dddb, 0x6f52c06c, 0x6211e6b5, 0x66d0fb02, 0x5e9f46bf, 0x5a5e5b08,
0x571d7dd1, 0x53dc6066, 0x4d9b3063, 0x495a2dd4, 0x44190b0d, 0x40d816ba,
0xaca5c697, 0xa864db20, 0xa527fdf9, 0xa1e6e04e, 0xbfa1b04b, 0xbb60adfc,
0xb6238b25, 0xb2e29692, 0x8aad2b2f, 0x8e6c3698, 0x832f1041, 0x87ee0df6,
0x99a95df3, 0x9d684044, 0x902b669d, 0x94ea7b2a, 0xe0b41de7, 0xe4750050,
0xe9362689, 0xedf73b3e, 0xf3b06b3b, 0xf771768c, 0xfa325055, 0xfef34de2,
0xc6bcf05f, 0xc27dede8, 0xcf3ecb31, 0xcbffd686, 0xd5b88683, 0xd1799b34,
0xdc3abded, 0xd8fba05a, 0x690ce0ee, 0x6dcdfd59, 0x608edb80, 0x644fc637,
0x7a089632, 0x7ec98b85, 0x738aad5c, 0x774bb0eb, 0x4f040d56, 0x4bc510e1,
0x46863638, 0x42472b8f, 0x5c007b8a, 0x58c1663d, 0x558240e4, 0x51435d53,
0x251d3b9e, 0x21dc2629, 0x2c9f00f0, 0x285e1d47, 0x36194d42, 0x32d850f5,
0x3f9b762c, 0x3b5a6b9b, 0x0315d626, 0x07d4cb91, 0x0a97ed48, 0x0e56f0ff,
0x1011a0fa, 0x14d0bd4d, 0x19939b94, 0x1d528623, 0xf12f560e, 0xf5ee4bb9,
0xf8ad6d60, 0xfc6c70d7, 0xe22b20d2, 0xe6ea3d65, 0xeba91bbc, 0xef68060b,
0xd727bbb6, 0xd3e6a601, 0xdea580d8, 0xda649d6f, 0xc423cd6a, 0xc0e2d0dd,
0xcda1f604, 0xc960ebb3, 0xbd3e8d7e, 0xb9ff90c9, 0xb4bcb610, 0xb07daba7,
0xae3afba2, 0xaafbe615, 0xa7b8c0cc, 0xa379dd7b, 0x9b3660c6, 0x9ff77d71,
0x92b45ba8, 0x9675461f, 0x8832161a, 0x8cf30bad, 0x81b02d74, 0x857130c3,
0x5d8a9099, 0x594b8d2e, 0x5408abf7, 0x50c9b640, 0x4e8ee645, 0x4a4ffbf2,
0x470cdd2b, 0x43cdc09c, 0x7b827d21, 0x7f436096, 0x7200464f, 0x76c15bf8,
0x68860bfd, 0x6c47164a, 0x61043093, 0x65c52d24, 0x119b4be9, 0x155a565e,
0x18197087, 0x1cd86d30, 0x029f3d35, 0x065e2082, 0x0b1d065b, 0x0fdc1bec,
0x3793a651, 0x3352bbe6, 0x3e119d3f, 0x3ad08088, 0x2497d08d, 0x2056cd3a,
0x2d15ebe3, 0x29d4f654, 0xc5a92679, 0xc1683bce, 0xcc2b1d17, 0xc8ea00a0,
0xd6ad50a5, 0xd26c4d12, 0xdf2f6bcb, 0xdbee767c, 0xe3a1cbc1, 0xe760d676,
0xea23f0af, 0xeee2ed18, 0xf0a5bd1d, 0xf464a0aa, 0xf9278673, 0xfde69bc4,
0x89b8fd09, 0x8d79e0be, 0x803ac667, 0x84fbdbd0, 0x9abc8bd5, 0x9e7d9662,
0x933eb0bb, 0x97ffad0c, 0xafb010b1, 0xab710d06, 0xa6322bdf, 0xa2f33668,
0xbcb4666d, 0xb8757bda, 0xb5365d03, 0xb1f740b4
};
/* _calc_crc32 relicenced to LGPL from fluendo ts demuxer */
static guint32
_calc_crc32 (const guint8 * data, guint datalen)
{
gint i;
guint32 crc = 0xffffffff;
for (i = 0; i < datalen; i++) {
crc = (crc << 8) ^ crc_tab[((crc >> 24) ^ *data++) & 0xff];
}
return crc;
}
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;
hour = ((utc_ptr[0] & 0xF0) >> 4) * 10 + (utc_ptr[0] & 0x0F);
minute = ((utc_ptr[1] & 0xF0) >> 4) * 10 + (utc_ptr[1] & 0x0F);
second = ((utc_ptr[2] & 0xF0) >> 4) * 10 + (utc_ptr[2] & 0x0F);
/* Time is UTC */
return gst_date_time_new (0.0, year, month, day, hour, minute,
(gdouble) second);
}
/*
* GENERIC MPEG-TS SECTION
*/
static void
_gst_mpegts_section_free (GstMpegTsSection * section)
{
GST_DEBUG ("Freeing section type %d", section->section_type);
/* FIXME : Implement */
if (section->cached_parsed) {
switch (section->section_type) {
case GST_MPEGTS_SECTION_PAT:
g_array_unref ((GArray *) section->cached_parsed);
break;
case GST_MPEGTS_SECTION_PMT:
{
GstMpegTsPMT *pmt = (GstMpegTsPMT *) section->cached_parsed;
g_array_unref (pmt->descriptors);
g_ptr_array_unref (pmt->streams);
break;
}
case GST_MPEGTS_SECTION_TOT:
{
GstMpegTsTOT *tot = (GstMpegTsTOT *) section->cached_parsed;
gst_date_time_unref (tot->utc_time);
g_array_unref (tot->descriptors);
break;
}
case GST_MPEGTS_SECTION_TDT:
gst_date_time_unref ((GstDateTime *) section->cached_parsed);
break;
case GST_MPEGTS_SECTION_CAT:
g_array_unref ((GArray *) section->cached_parsed);
break;
case GST_MPEGTS_SECTION_NIT:
{
GstMpegTsNIT *nit = (GstMpegTsNIT *) section->cached_parsed;
g_array_unref (nit->descriptors);
g_ptr_array_unref (nit->streams);
break;
}
case GST_MPEGTS_SECTION_EIT:
{
GstMpegTsEIT *eit = (GstMpegTsEIT *) section->cached_parsed;
g_ptr_array_unref (eit->events);
break;
}
case GST_MPEGTS_SECTION_SDT:
{
GstMpegTsSDT *sdt = (GstMpegTsSDT *) section->cached_parsed;
g_ptr_array_unref (sdt->services);
break;
}
default:
break;
}
}
if (section->data)
g_free (section->data);
g_slice_free (GstMpegTsSection, section);
}
static GstMpegTsSection *
_gst_mpegts_section_copy (GstMpegTsSection * section)
{
GstMpegTsSection *copy;
copy = g_slice_new0 (GstMpegTsSection);
gst_mini_object_init (GST_MINI_OBJECT_CAST (copy), 0, MPEG_TYPE_TS_SECTION,
(GstMiniObjectCopyFunction) _gst_mpegts_section_copy, NULL,
(GstMiniObjectFreeFunction) _gst_mpegts_section_free);
copy->section_type = section->section_type;
copy->pid = section->pid;
copy->table_id = section->table_id;
copy->subtable_extension = section->subtable_extension;
copy->version_number = section->version_number;
copy->current_next_indicator = section->current_next_indicator;
copy->section_number = section->section_number;
copy->last_section_number = section->last_section_number;
copy->crc = section->crc;
copy->data = g_memdup (section->data, section->section_length);
copy->section_length = section->section_length;
/* Note: We do not copy the cached parsed item, it will be
* reconstructed on that copy */
copy->cached_parsed = NULL;
copy->offset = section->offset;
copy->short_section = section->short_section;
return copy;
}
/**
* gst_message_parse_mpegts_section:
* @message: a #GstMessage
*
* Returns the #GstMpegTsSection contained in a message.
*
* Returns: (transfer full): the contained #GstMpegTsSection, or %NULL.
*/
GstMpegTsSection *
gst_message_parse_mpegts_section (GstMessage * message)
{
const GstStructure *st;
GstMpegTsSection *section;
if (message->type != GST_MESSAGE_ELEMENT)
return NULL;
st = gst_message_get_structure (message);
/* FIXME : Add checks against know section names */
if (!gst_structure_id_get (st, QUARK_SECTION, GST_TYPE_MPEGTS_SECTION,
&section, NULL))
return NULL;
return section;
}
/**
* gst_message_new_mpegts_section:
* @parent: (transfer none): The creator of the message
* @section: (transfer none): The #GstMpegTsSection to put in a message
*
* Creates a new #GstMessage for a @GstMpegTsSection.
*
* Returns: (transfer full): The new #GstMessage to be posted, or %NULL if the
* section is not valid.
*/
GstMessage *
gst_message_new_mpegts_section (GstObject * parent, GstMpegTsSection * section)
{
GstMessage *msg;
GstStructure *st;
GQuark quark;
switch (section->section_type) {
case GST_MPEGTS_SECTION_PAT:
quark = QUARK_PAT;
break;
case GST_MPEGTS_SECTION_PMT:
quark = QUARK_PMT;
break;
case GST_MPEGTS_SECTION_CAT:
quark = QUARK_CAT;
break;
case GST_MPEGTS_SECTION_EIT:
quark = QUARK_EIT;
break;
case GST_MPEGTS_SECTION_BAT:
quark = QUARK_BAT;
break;
case GST_MPEGTS_SECTION_NIT:
quark = QUARK_NIT;
break;
case GST_MPEGTS_SECTION_SDT:
quark = QUARK_SDT;
break;
case GST_MPEGTS_SECTION_TDT:
quark = QUARK_TDT;
break;
case GST_MPEGTS_SECTION_TOT:
quark = QUARK_TOT;
break;
default:
GST_WARNING ("Creating message for unknown GstMpegTsSection");
quark = QUARK_SECTION;
break;
}
st = gst_structure_new_id (quark, QUARK_SECTION, MPEG_TYPE_TS_SECTION,
section, NULL);
msg = gst_message_new_element (parent, st);
return msg;
}
/* Program Association Table */
static GArray *
_parse_pat (GstMpegTsSection * section)
{
GArray *pat;
guint16 i = 0, nb_programs;
GstMpegTsPatProgram *program;
guint8 *data, *end;
/* Skip already parsed data */
data = section->data + 8;
/* stop at the CRC */
end = section->data + section->section_length;
/* Initialize program list */
nb_programs = (end - 4 - data) / 4;
pat =
g_array_sized_new (FALSE, FALSE, sizeof (GstMpegTsPatProgram),
nb_programs);
while (data < end - 4) {
program = &g_array_index (pat, GstMpegTsPatProgram, i);
program->program_number = GST_READ_UINT16_BE (data);
data += 2;
program->network_or_program_map_PID = GST_READ_UINT16_BE (data) & 0x1FFF;
data += 2;
i++;
}
pat->len = nb_programs;
if (data != end - 4) {
GST_ERROR ("at the end of PAT data != end - 4");
g_array_unref (pat);
return NULL;
}
return pat;
}
/**
* gst_mpegts_section_get_pat:
* @section: a #GstMpegTsSection of type %GST_MPEGTS_SECTION_PAT
*
* Parses a Program Association Table (ITU H.222.0, ISO/IEC 13818-1).
*
* Returns the array of #GstMpegTsPatProgram contained in the section.
*
* Note: The PAT "transport_id" field corresponds to the "subtable_extension"
* field of the provided @section.
*
* Returns: (transfer container) (element-type GstMpegTsPatProgram): The
* #GstMpegTsPatProgram contained in the section, or %NULL if an error
* happened. Release with #g_ptr_array_unref when done.
*/
GArray *
gst_mpegts_section_get_pat (GstMpegTsSection * section)
{
g_return_val_if_fail (section->section_type == GST_MPEGTS_SECTION_PAT, NULL);
g_return_val_if_fail (section->cached_parsed || section->data, NULL);
if (!section->cached_parsed) {
if (G_UNLIKELY (_calc_crc32 (section->data, section->section_length) != 0))
goto bad_crc;
section->cached_parsed = (gpointer) _parse_pat (section);
if (section->cached_parsed == NULL)
goto parse_failure;
}
return g_array_ref ((GArray *) section->cached_parsed);
bad_crc:
{
GST_WARNING ("Bad CRC on section");
return NULL;
}
parse_failure:
{
GST_WARNING ("Failure to parse section");
return NULL;
}
}
/* Program Map Table */
static GstMpegTsPMTStream *
_gst_mpegts_pmt_stream_copy (GstMpegTsPMTStream * pmt)
{
/* FIXME : IMPLEMENT */
return NULL;
}
static void
_gst_mpegts_pmt_stream_free (GstMpegTsPMTStream * pmt)
{
g_array_unref (pmt->descriptors);
g_slice_free (GstMpegTsPMTStream, pmt);
}
G_DEFINE_BOXED_TYPE (GstMpegTsPMTStream, gst_mpegts_pmt_stream,
(GBoxedCopyFunc) _gst_mpegts_pmt_stream_copy,
(GFreeFunc) _gst_mpegts_pmt_stream_free);
static GstMpegTsPMT *
_gst_mpegts_pmt_copy (GstMpegTsPMT * pmt)
{
/* FIXME : IMPLEMENT */
return NULL;
}
static void
_gst_mpegts_pmt_free (GstMpegTsPMT * pmt)
{
/* FIXME: IMPLEMENT */
}
G_DEFINE_BOXED_TYPE (GstMpegTsPMT, gst_mpegts_pmt,
(GBoxedCopyFunc) _gst_mpegts_pmt_copy, (GFreeFunc) _gst_mpegts_pmt_free);
static GstMpegTsPMT *
_parse_pmt (GstMpegTsSection * section)
{
GstMpegTsPMT *pmt = NULL;
guint i = 0, allocated_streams = 8;
guint8 *data, *end;
guint program_info_length;
guint stream_info_length;
/* fixed header + CRC == 16 */
if (section->section_length < 16) {
GST_WARNING ("PID %d invalid PMT size %d",
section->pid, section->section_length);
goto error;
}
pmt = g_slice_new0 (GstMpegTsPMT);
data = section->data;
end = data + section->section_length;
GST_DEBUG ("Parsing %d Program Map Table", section->subtable_extension);
/* Skip already parsed data */
data += 8;
pmt->pcr_pid = GST_READ_UINT16_BE (data) & 0x1FFF;
data += 2;
program_info_length = GST_READ_UINT16_BE (data) & 0x0FFF;
data += 2;
/* check that the buffer is large enough to contain at least
* program_info_length bytes + CRC */
if (program_info_length && (data + program_info_length + 4 > end)) {
GST_WARNING ("PID %d invalid program info length %d left %d",
section->pid, program_info_length, (gint) (end - data));
goto error;
}
pmt->descriptors = gst_mpegts_parse_descriptors (data, program_info_length);
if (pmt->descriptors == NULL)
goto error;
data += program_info_length;
pmt->streams =
g_ptr_array_new_full (allocated_streams,
(GDestroyNotify) _gst_mpegts_pmt_stream_free);
/* parse entries, cycle until there's space for another entry (at least 5
* bytes) plus the CRC */
while (data <= end - 4 - 5) {
GstMpegTsPMTStream *stream = g_slice_new0 (GstMpegTsPMTStream);
g_ptr_array_add (pmt->streams, stream);
stream->stream_type = *data++;
GST_DEBUG ("[%d] Stream type 0x%02x found", i, stream->stream_type);
stream->pid = GST_READ_UINT16_BE (data) & 0x1FFF;
data += 2;
stream_info_length = GST_READ_UINT16_BE (data) & 0x0FFF;
data += 2;
if (data + stream_info_length + 4 > end) {
GST_WARNING ("PID %d invalid stream info length %d left %d", section->pid,
stream_info_length, (gint) (end - data));
goto error;
}
stream->descriptors =
gst_mpegts_parse_descriptors (data, stream_info_length);
if (stream->descriptors == NULL)
goto error;
data += stream_info_length;
i += 1;
}
g_assert (data == end - 4);
return pmt;
error:
if (pmt)
gst_mpegts_section_unref (pmt);
return NULL;
}
/**
* gst_mpegts_section_get_pmt:
* @section: a #GstMpegTsSection of type %GST_MPEGTS_SECTION_PMT
*
* Returns the #GstMpegTsPMT contained in the @section.
*
* Returns: The #GstMpegTsPMT contained in the section, or %NULL if an error
* happened.
*/
const GstMpegTsPMT *
gst_mpegts_section_get_pmt (GstMpegTsSection * section)
{
g_return_val_if_fail (section->section_type == GST_MPEGTS_SECTION_PMT, NULL);
g_return_val_if_fail (section->cached_parsed || section->data, NULL);
if (!section->cached_parsed) {
if (G_UNLIKELY (_calc_crc32 (section->data, section->section_length) != 0))
goto bad_crc;
section->cached_parsed = (gpointer) _parse_pmt (section);
if (section->cached_parsed == NULL)
goto parse_failure;
}
return (const GstMpegTsPMT *) section->cached_parsed;
bad_crc:
{
GST_WARNING ("Bad CRC on section");
return NULL;
}
parse_failure:
{
GST_WARNING ("Failure to parse section");
return NULL;
}
}
/* Conditional Access Table */
static GArray *
_parse_cat (GstMpegTsSection * section)
{
guint8 *data;
guint desc_len;
/* Skip parts already parsed */
data = section->data + 8;
/* descriptors */
desc_len = section->section_length - 4 - 8;
return gst_mpegts_parse_descriptors (data, desc_len);
}
/**
* gst_mpegts_section_get_cat:
* @section: a #GstMpegTsSection of type %GST_MPEGTS_SECTION_CAT
*
* Returns the array of #GstMpegTsDescriptor contained in the Condtional
* Access Table.
*
* Returns: (transfer container) (element-type GstMpegTsDescriptor): The
* #GstMpegTsDescriptor contained in the section, or %NULL if an error
* happened. Release with #g_array_unref when done.
*/
GArray *
gst_mpegts_section_get_cat (GstMpegTsSection * section)
{
g_return_val_if_fail (section->section_type == GST_MPEGTS_SECTION_CAT, NULL);
g_return_val_if_fail (section->cached_parsed || section->data, NULL);
if (!section->cached_parsed) {
section->cached_parsed = (gpointer) _parse_cat (section);
if (section->cached_parsed == NULL)
goto parse_failure;
}
return g_array_ref ((GArray *) section->cached_parsed);
parse_failure:
{
GST_WARNING ("Failure to parse section");
return NULL;
}
}
/* Transport Stream Description Table (TSDT) */
/**
* gst_mpegts_section_get_tsdt:
* @section: a #GstMpegTsSection of type %GST_MPEGTS_SECTION_TSDT
*
* Returns the array of #GstMpegTsDescriptor contained in the section
*
* Returns: (transfer container) (element-type GstMpegTsDescriptor): The
* #GstMpegTsDescriptor contained in the section, or %NULL if an error
* happened. Release with #g_array_unref when done.
*/
GArray *
gst_mpegts_section_get_tsdt (GstMpegTsSection * section)
{
g_return_val_if_fail (section->section_type == GST_MPEGTS_SECTION_TSDT, NULL);
g_return_val_if_fail (section->cached_parsed || section->data, NULL);
if (section->cached_parsed)
return g_array_ref ((GArray *) section->cached_parsed);
/* FIXME : parse TSDT */
return NULL;
}
/* Event Information Table */
static GstMpegTsEIT *
_gst_mpegts_eit_copy (GstMpegTsEIT * eit)
{
/* FIXME : IMPLEMENT */
return NULL;
}
static void
_gst_mpegts_eit_free (GstMpegTsEIT * eit)
{
/* FIXME: IMPLEMENT */
}
G_DEFINE_BOXED_TYPE (GstMpegTsEIT, gst_mpegts_eit,
(GBoxedCopyFunc) _gst_mpegts_eit_copy, (GFreeFunc) _gst_mpegts_eit_free);
static GstMpegTsEITEvent *
_gst_mpegts_eit_event_copy (GstMpegTsEITEvent * eit)
{
/* FIXME : IMPLEMENT */
return NULL;
}
static void
_gst_mpegts_eit_event_free (GstMpegTsEITEvent * eit)
{
/* FIXME: IMPLEMENT */
}
G_DEFINE_BOXED_TYPE (GstMpegTsEITEvent, gst_mpegts_eit_event,
(GBoxedCopyFunc) _gst_mpegts_eit_event_copy,
(GFreeFunc) _gst_mpegts_eit_event_free);
static GstMpegTsEIT *
_parse_eit (GstMpegTsSection * section)
{
GstMpegTsEIT *eit = NULL;
guint i = 0, allocated_events = 12;
guint8 *data, *end, *duration_ptr;
guint16 descriptors_loop_length;
/* fixed header + CRC == 16 */
if (section->section_length < 18) {
GST_WARNING ("PID %d invalid EIT size %d",
section->pid, section->section_length);
goto error;
}
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 eit;
error:
if (eit)
gst_mpegts_section_unref (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) {
if (G_UNLIKELY (_calc_crc32 (section->data, section->section_length) != 0))
goto bad_crc;
section->cached_parsed = (gpointer) _parse_eit (section);
if (section->cached_parsed == NULL)
goto parse_failure;
}
return (const GstMpegTsEIT *) section->cached_parsed;
bad_crc:
{
GST_WARNING ("Bad CRC on section");
return NULL;
}
parse_failure:
{
GST_WARNING ("Failure to parse section");
return NULL;
}
}
/* Bouquet Association Table */
static GstMpegTsBAT *
_gst_mpegts_bat_copy (GstMpegTsBAT * bat)
{
/* FIXME : IMPLEMENT */
return NULL;
}
static void
_gst_mpegts_bat_free (GstMpegTsBAT * bat)
{
/* FIXME: IMPLEMENT */
}
G_DEFINE_BOXED_TYPE (GstMpegTsBAT, gst_mpegts_bat,
(GBoxedCopyFunc) _gst_mpegts_bat_copy, (GFreeFunc) _gst_mpegts_bat_free);
/* Network Information Table */
static GstMpegTsNIT *
_gst_mpegts_nit_copy (GstMpegTsNIT * nit)
{
/* FIXME : IMPLEMENT */
return NULL;
}
static void
_gst_mpegts_nit_free (GstMpegTsNIT * nit)
{
/* FIXME: IMPLEMENT */
}
G_DEFINE_BOXED_TYPE (GstMpegTsNIT, gst_mpegts_nit,
(GBoxedCopyFunc) _gst_mpegts_nit_copy, (GFreeFunc) _gst_mpegts_nit_free);
static GstMpegTsNITStream *
_gst_mpegts_nit_stream_copy (GstMpegTsNITStream * nit)
{
/* FIXME : IMPLEMENT */
return NULL;
}
static void
_gst_mpegts_nit_stream_free (GstMpegTsNITStream * nit)
{
g_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 *
_parse_nit (GstMpegTsSection * section)
{
GstMpegTsNIT *nit = NULL;
guint i = 0, j, allocated_streams = 12;
guint8 *data, *end, *entry_begin;
guint16 descriptors_loop_length, transport_stream_loop_length;
GST_DEBUG ("NIT");
/* fixed header + CRC == 16 */
if (section->section_length < 23) {
GST_WARNING ("PID %d invalid NIT size %d",
section->pid, section->section_length);
goto error;
}
nit = g_slice_new0 (GstMpegTsNIT);
data = section->data;
end = data + section->section_length;
/* Skip already parsed data */
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 < 10) {
/* each entry must be at least 6 bytes (+ 4bytes 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, 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;
/* At least notify the descriptors we are not handling :( */
for (j = 0; j < stream->descriptors->len; j++) {
GstMpegTsDescriptor *desc =
&g_array_index (stream->descriptors, GstMpegTsDescriptor, j);
switch (desc->descriptor_tag) {
case GST_MTS_DESC_DVB_TERRESTRIAL_DELIVERY_SYSTEM:
case GST_MTS_DESC_DVB_FREQUENCY_LIST:
GST_FIXME ("Not handling previously handled tag 0x%02x",
desc->descriptor_tag);
break;
default:
GST_LOG ("Not handling tag 0x%02x", desc->descriptor_tag);
break;
}
}
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 nit;
error:
if (nit)
gst_mpegts_section_unref (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) {
if (G_UNLIKELY (_calc_crc32 (section->data, section->section_length) != 0))
goto bad_crc;
section->cached_parsed = (gpointer) _parse_nit (section);
if (section->cached_parsed == NULL)
goto parse_failure;
}
return (const GstMpegTsNIT *) section->cached_parsed;
bad_crc:
{
GST_WARNING ("Bad CRC on section");
return NULL;
}
parse_failure:
{
GST_WARNING ("Failure to parse section");
return NULL;
}
}
/* Service Description Table (SDT) */
static GstMpegTsSDT *
_gst_mpegts_sdt_copy (GstMpegTsSDT * sdt)
{
/* FIXME : IMPLEMENT */
return NULL;
}
static void
_gst_mpegts_sdt_free (GstMpegTsSDT * sdt)
{
/* FIXME: IMPLEMENT */
}
G_DEFINE_BOXED_TYPE (GstMpegTsSDT, gst_mpegts_sdt,
(GBoxedCopyFunc) _gst_mpegts_sdt_copy, (GFreeFunc) _gst_mpegts_sdt_free);
static GstMpegTsSDTService *
_gst_mpegts_sdt_service_copy (GstMpegTsSDTService * sdt)
{
/* FIXME : IMPLEMENT */
return NULL;
}
static void
_gst_mpegts_sdt_service_free (GstMpegTsSDTService * sdt)
{
g_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 *
_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");
/* fixed header + CRC == 16 */
if (section->section_length < 14) {
GST_WARNING ("PID %d invalid SDT size %d",
section->pid, section->section_length);
goto error;
}
sdt = g_slice_new0 (GstMpegTsSDT);
data = section->data;
end = data + section->section_length;
/* 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 < 9) {
/* 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) {
if (G_UNLIKELY (_calc_crc32 (section->data, section->section_length) != 0))
goto bad_crc;
section->cached_parsed = (gpointer) _parse_sdt (section);
if (section->cached_parsed == NULL)
goto parse_failure;
}
return (const GstMpegTsSDT *) section->cached_parsed;
bad_crc:
{
GST_WARNING ("Bad CRC on section");
return NULL;
}
parse_failure:
{
GST_WARNING ("Failure to parse section");
return NULL;
}
}
/* Time and Date Table (TDT) */
static GstDateTime *
_parse_tdt (GstMpegTsSection * section)
{
/* FIXME : Add length check */
return _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 = (gpointer) _parse_tdt (section);
if (section->cached_parsed == NULL)
goto parse_failure;
}
return gst_date_time_ref ((GstDateTime *) section->cached_parsed);
parse_failure:
{
GST_WARNING ("Failure to parse section");
return NULL;
}
}
/* Time Offset Table (TOT) */
static GstMpegTsTOT *
_gst_mpegts_tot_copy (GstMpegTsTOT * tot)
{
/* FIXME : IMPLEMENT */
return NULL;
}
static void
_gst_mpegts_tot_free (GstMpegTsTOT * tot)
{
/* FIXME: IMPLEMENT */
}
G_DEFINE_BOXED_TYPE (GstMpegTsTOT, gst_mpegts_tot,
(GBoxedCopyFunc) _gst_mpegts_tot_copy, (GFreeFunc) _gst_mpegts_tot_free);
static GstMpegTsTOT *
_parse_tot (GstMpegTsSection * section)
{
guint8 *data;
GstMpegTsTOT *tot;
guint16 desc_len;
/* FIXME : Check minimum length */
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;
tot->descriptors = gst_mpegts_parse_descriptors (data, desc_len);
return 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) {
if (G_UNLIKELY (_calc_crc32 (section->data, section->section_length) != 0))
goto bad_crc;
section->cached_parsed = (gpointer) _parse_tot (section);
if (section->cached_parsed == NULL)
goto parse_failure;
}
return (const GstMpegTsTOT *) section->cached_parsed;
bad_crc:
{
GST_WARNING ("Bad CRC on section");
return NULL;
}
parse_failure:
{
GST_WARNING ("Failure to parse section");
return NULL;
}
}
/**
* gst_mpegts_initialize:
*
* Initializes the MPEG-TS helper library. Must be called before any
* usage.
*/
void
gst_mpegts_initialize (void)
{
if (_gst_mpegts_section_type)
return;
GST_DEBUG_CATEGORY_INIT (gst_mpegts_debug, "mpegts", 0,
"MPEG-TS helper library");
/* FIXME : Temporary hack to initialize section gtype */
_gst_mpegts_section_type = gst_mpegts_section_get_type ();
QUARK_PAT = g_quark_from_string ("pat");
QUARK_CAT = g_quark_from_string ("cat");
QUARK_PMT = g_quark_from_string ("pmt");
QUARK_NIT = g_quark_from_string ("nit");
QUARK_BAT = g_quark_from_string ("bat");
QUARK_SDT = g_quark_from_string ("sdt");
QUARK_EIT = g_quark_from_string ("eit");
QUARK_TDT = g_quark_from_string ("tdt");
QUARK_TOT = g_quark_from_string ("tot");
QUARK_SECTION = g_quark_from_string ("section");
__initialize_descriptors ();
}
static GstMpegTsSectionType
_identify_section (GstMpegTsSectionTableID table_id)
{
switch (table_id) {
case GST_MTS_TABLE_ID_PROGRAM_ASSOCIATION:
return GST_MPEGTS_SECTION_PAT;
case GST_MTS_TABLE_ID_CONDITIONAL_ACCESS:
return GST_MPEGTS_SECTION_CAT;
case GST_MTS_TABLE_ID_TS_PROGRAM_MAP:
return GST_MPEGTS_SECTION_PMT;
case GST_MTS_TABLE_ID_BOUQUET_ASSOCIATION:
return GST_MPEGTS_SECTION_BAT;
case GST_MTS_TABLE_ID_NETWORK_INFORMATION_ACTUAL_NETWORK:
case GST_MTS_TABLE_ID_NETWORK_INFORMATION_OTHER_NETWORK:
return GST_MPEGTS_SECTION_NIT;
case GST_MTS_TABLE_ID_SERVICE_DESCRIPTION_ACTUAL_TS:
case GST_MTS_TABLE_ID_SERVICE_DESCRIPTION_OTHER_TS:
return GST_MPEGTS_SECTION_SDT;
case GST_MTS_TABLE_ID_TIME_DATE:
return GST_MPEGTS_SECTION_TDT;
case GST_MTS_TABLE_ID_TIME_OFFSET:
return GST_MPEGTS_SECTION_TOT;
/* FIXME : FILL */
default:
/* Handle ranges */
if (table_id >= GST_MTS_TABLE_ID_EVENT_INFORMATION_ACTUAL_TS_PRESENT &&
table_id <= GST_MTS_TABLE_ID_EVENT_INFORMATION_OTHER_TS_SCHEDULE_N)
return GST_MPEGTS_SECTION_EIT;
return GST_MPEGTS_SECTION_UNKNOWN;
}
}
/**
* gst_mpegts_section_new:
* @pid: the PID to which this section belongs
* @data: (transfer full): a pointer to the beginning of the section (i.e. the first byte
* should contain the table_id field).
* @data_size: size of the @data argument.
*
* Creates a new #GstMpegTsSection from the provided @data.
*
* Note: Ensuring @data is big enough to contain the full section is the
* responsibility of the caller. If it is not big enough, %NULL will be
* returned.
*
* Note: it is the responsibility of the caller to ensure @data does point
* to the beginning of the section.
*
* Returns: (transfer full): A new #GstMpegTsSection if the data was valid,
* else %NULL
*/
GstMpegTsSection *
gst_mpegts_section_new (guint16 pid, guint8 * data, gsize data_size)
{
GstMpegTsSection *res = NULL;
guint8 tmp;
guint16 section_length;
/* Check for length */
section_length = GST_READ_UINT16_BE (data + 1) & 0x0FFF;
if (G_UNLIKELY (data_size < section_length + 3))
goto short_packet;
res = g_slice_new0 (GstMpegTsSection);
gst_mini_object_init (GST_MINI_OBJECT_CAST (res), 0, MPEG_TYPE_TS_SECTION,
(GstMiniObjectCopyFunction) _gst_mpegts_section_copy, NULL,
(GstMiniObjectFreeFunction) _gst_mpegts_section_free);
res->pid = pid;
res->data = data;
/* table_id : 8 bit */
res->table_id = *data++;
/* section_syntax_indicator : 1 bit
* other_fields (reserved) : 3 bit*/
res->short_section = (*data & 0x80) == 0x00;
/* section_length (already parsed) : 12 bit */
res->section_length = section_length + 3;
if (!res->short_section) {
/* CRC is after section_length (-4 for the size of the CRC) */
res->crc = GST_READ_UINT32_BE (res->data + res->section_length - 4);
/* Skip to after section_length */
data += 2;
/* subtable extension : 16 bit */
res->subtable_extension = GST_READ_UINT16_BE (data);
data += 2;
/* reserved : 2 bit
* version_number : 5 bit
* current_next_indicator : 1 bit */
tmp = *data++;
res->version_number = tmp >> 1 & 0x1f;
res->current_next_indicator = tmp & 0x01;
/* section_number : 8 bit */
res->section_number = *data++;
/* last_section_number : 8 bit */
res->last_section_number = *data;
}
res->section_type = _identify_section (res->table_id);
return res;
short_packet:
{
GST_WARNING
("PID 0x%04x section extends past provided data (got:%" G_GSIZE_FORMAT
", need:%d)", pid, data_size, section_length + 3);
return NULL;
}
}
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