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1348 lines
39 KiB
C
1348 lines
39 KiB
C
/*
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* gstmpegtssection.c -
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* Copyright (C) 2013 Edward Hervey
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* Copyright (C) 2011, Hewlett-Packard Development Company, L.P.
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* Copyright (C) 2007 Alessandro Decina
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* 2010 Edward Hervey
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* Author: Youness Alaoui <youness.alaoui@collabora.co.uk>, Collabora Ltd.
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* Author: Sebastian Dröge <sebastian.droege@collabora.co.uk>, Collabora Ltd.
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* Author: Edward Hervey <bilboed@bilboed.com>, Collabora Ltd.
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*
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* Authors:
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* Alessandro Decina <alessandro@nnva.org>
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* Zaheer Abbas Merali <zaheerabbas at merali dot org>
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* Edward Hervey <edward@collabora.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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/**
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* SECTION:gstmpegtssection
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* @title: Base MPEG-TS sections
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* @short_description: Sections for ITU H.222.0 | ISO/IEC 13818-1
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* @include: gst/mpegts/mpegts.h
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*
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* ## Generic usage of sections with %GstMpegtsSection
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*
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* The %GstMpegtsSection object is the representation of MPEG-TS Section (SI or
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* PSI).
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*
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* Various elements can post those on the bus via %GstMessage of type
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* %GST_MESSAGE_ELEMENT. The gst_message_parse_mpegts_section() function
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* provides access to the section.
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*
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* Applications (or other elements) can create them either by using one of the
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* `gst_mpegts_section_from_*` functions, or by providing the raw SI data via
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* gst_mpegts_section_new().
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*
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* Elements outputting MPEG-TS streams can also create sections using the
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* various convenience functions and then get the packetized data (to be
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* inserted in MPEG-TS packets) using gst_mpegts_section_packetize().
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*
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* For more details, refer to the ITU H.222.0 or ISO/IEC 13818-1 specifications
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* and other specifications mentioned in the documentation.
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*
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* # Supported base MPEG-TS sections
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* These are the sections for which parsing and packetizing code exists.
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*
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* ## Program Association Table (PAT)
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* See:
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* * gst_mpegts_section_get_pat()
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* * gst_mpegts_pat_program_new()
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* * %GstMpegtsPatProgram
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*
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* ## Conditional Access Table (CAT)
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* See:
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* * gst_mpegts_section_get_cat()
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*
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* ## Program Map Table (PMT)
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* See:
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* * %GstMpegtsPMT
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* * gst_mpegts_section_get_pmt()
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* * gst_mpegts_pmt_new()
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* * %GstMpegtsPMTStream
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*
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* ## Transport Stream Description Table (TSDT)
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* See:
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* * gst_mpegts_section_get_tsdt()
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* # API
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*/
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static GQuark QUARK_PAT;
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static GQuark QUARK_CAT;
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static GQuark QUARK_BAT;
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static GQuark QUARK_PMT;
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static GQuark QUARK_NIT;
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static GQuark QUARK_SDT;
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static GQuark QUARK_EIT;
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static GQuark QUARK_TDT;
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static GQuark QUARK_TOT;
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static GQuark QUARK_SCTE_SIT;
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static GQuark QUARK_SECTION;
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static GType _gst_mpegts_section_type = 0;
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#define MPEG_TYPE_TS_SECTION (_gst_mpegts_section_type)
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GST_DEFINE_MINI_OBJECT_TYPE (GstMpegtsSection, gst_mpegts_section);
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static const guint32 crc_tab[256] = {
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0x00000000, 0x04c11db7, 0x09823b6e, 0x0d4326d9, 0x130476dc, 0x17c56b6b,
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0x1a864db2, 0x1e475005, 0x2608edb8, 0x22c9f00f, 0x2f8ad6d6, 0x2b4bcb61,
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0x350c9b64, 0x31cd86d3, 0x3c8ea00a, 0x384fbdbd, 0x4c11db70, 0x48d0c6c7,
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0x4593e01e, 0x4152fda9, 0x5f15adac, 0x5bd4b01b, 0x569796c2, 0x52568b75,
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0x6a1936c8, 0x6ed82b7f, 0x639b0da6, 0x675a1011, 0x791d4014, 0x7ddc5da3,
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0x709f7b7a, 0x745e66cd, 0x9823b6e0, 0x9ce2ab57, 0x91a18d8e, 0x95609039,
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0x8b27c03c, 0x8fe6dd8b, 0x82a5fb52, 0x8664e6e5, 0xbe2b5b58, 0xbaea46ef,
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0xb7a96036, 0xb3687d81, 0xad2f2d84, 0xa9ee3033, 0xa4ad16ea, 0xa06c0b5d,
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0xd4326d90, 0xd0f37027, 0xddb056fe, 0xd9714b49, 0xc7361b4c, 0xc3f706fb,
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0xceb42022, 0xca753d95, 0xf23a8028, 0xf6fb9d9f, 0xfbb8bb46, 0xff79a6f1,
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0xe13ef6f4, 0xe5ffeb43, 0xe8bccd9a, 0xec7dd02d, 0x34867077, 0x30476dc0,
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0x3d044b19, 0x39c556ae, 0x278206ab, 0x23431b1c, 0x2e003dc5, 0x2ac12072,
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0x128e9dcf, 0x164f8078, 0x1b0ca6a1, 0x1fcdbb16, 0x018aeb13, 0x054bf6a4,
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0x0808d07d, 0x0cc9cdca, 0x7897ab07, 0x7c56b6b0, 0x71159069, 0x75d48dde,
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0x6b93dddb, 0x6f52c06c, 0x6211e6b5, 0x66d0fb02, 0x5e9f46bf, 0x5a5e5b08,
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0x571d7dd1, 0x53dc6066, 0x4d9b3063, 0x495a2dd4, 0x44190b0d, 0x40d816ba,
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0xaca5c697, 0xa864db20, 0xa527fdf9, 0xa1e6e04e, 0xbfa1b04b, 0xbb60adfc,
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0xb6238b25, 0xb2e29692, 0x8aad2b2f, 0x8e6c3698, 0x832f1041, 0x87ee0df6,
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0x99a95df3, 0x9d684044, 0x902b669d, 0x94ea7b2a, 0xe0b41de7, 0xe4750050,
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0xe9362689, 0xedf73b3e, 0xf3b06b3b, 0xf771768c, 0xfa325055, 0xfef34de2,
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0xc6bcf05f, 0xc27dede8, 0xcf3ecb31, 0xcbffd686, 0xd5b88683, 0xd1799b34,
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0xdc3abded, 0xd8fba05a, 0x690ce0ee, 0x6dcdfd59, 0x608edb80, 0x644fc637,
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0x7a089632, 0x7ec98b85, 0x738aad5c, 0x774bb0eb, 0x4f040d56, 0x4bc510e1,
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0x46863638, 0x42472b8f, 0x5c007b8a, 0x58c1663d, 0x558240e4, 0x51435d53,
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0x251d3b9e, 0x21dc2629, 0x2c9f00f0, 0x285e1d47, 0x36194d42, 0x32d850f5,
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0x3f9b762c, 0x3b5a6b9b, 0x0315d626, 0x07d4cb91, 0x0a97ed48, 0x0e56f0ff,
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0x1011a0fa, 0x14d0bd4d, 0x19939b94, 0x1d528623, 0xf12f560e, 0xf5ee4bb9,
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0xf8ad6d60, 0xfc6c70d7, 0xe22b20d2, 0xe6ea3d65, 0xeba91bbc, 0xef68060b,
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0xd727bbb6, 0xd3e6a601, 0xdea580d8, 0xda649d6f, 0xc423cd6a, 0xc0e2d0dd,
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0xcda1f604, 0xc960ebb3, 0xbd3e8d7e, 0xb9ff90c9, 0xb4bcb610, 0xb07daba7,
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0xae3afba2, 0xaafbe615, 0xa7b8c0cc, 0xa379dd7b, 0x9b3660c6, 0x9ff77d71,
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0x92b45ba8, 0x9675461f, 0x8832161a, 0x8cf30bad, 0x81b02d74, 0x857130c3,
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0x5d8a9099, 0x594b8d2e, 0x5408abf7, 0x50c9b640, 0x4e8ee645, 0x4a4ffbf2,
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0x470cdd2b, 0x43cdc09c, 0x7b827d21, 0x7f436096, 0x7200464f, 0x76c15bf8,
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0x68860bfd, 0x6c47164a, 0x61043093, 0x65c52d24, 0x119b4be9, 0x155a565e,
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0x18197087, 0x1cd86d30, 0x029f3d35, 0x065e2082, 0x0b1d065b, 0x0fdc1bec,
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0x3793a651, 0x3352bbe6, 0x3e119d3f, 0x3ad08088, 0x2497d08d, 0x2056cd3a,
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0x2d15ebe3, 0x29d4f654, 0xc5a92679, 0xc1683bce, 0xcc2b1d17, 0xc8ea00a0,
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0xd6ad50a5, 0xd26c4d12, 0xdf2f6bcb, 0xdbee767c, 0xe3a1cbc1, 0xe760d676,
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0xea23f0af, 0xeee2ed18, 0xf0a5bd1d, 0xf464a0aa, 0xf9278673, 0xfde69bc4,
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0x89b8fd09, 0x8d79e0be, 0x803ac667, 0x84fbdbd0, 0x9abc8bd5, 0x9e7d9662,
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0x933eb0bb, 0x97ffad0c, 0xafb010b1, 0xab710d06, 0xa6322bdf, 0xa2f33668,
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0xbcb4666d, 0xb8757bda, 0xb5365d03, 0xb1f740b4
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};
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/* _calc_crc32 relicensed to LGPL from fluendo ts demuxer */
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guint32
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_calc_crc32 (const guint8 * data, guint datalen)
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{
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gint i;
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guint32 crc = 0xffffffff;
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for (i = 0; i < datalen; i++) {
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crc = (crc << 8) ^ crc_tab[((crc >> 24) ^ *data++) & 0xff];
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}
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return crc;
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}
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gpointer
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__common_section_checks (GstMpegtsSection * section, guint min_size,
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GstMpegtsParseFunc parsefunc, GDestroyNotify destroynotify)
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{
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gpointer res;
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/* Check section is big enough */
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if (section->section_length < min_size) {
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GST_WARNING
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("PID:0x%04x table_id:0x%02x, section too small (Got %d, need at least %d)",
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section->pid, section->table_id, section->section_length, min_size);
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return NULL;
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}
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/* If section has a CRC, check it */
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if (!section->short_section
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&& (_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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/* Finally parse and set the destroy notify */
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res = parsefunc (section);
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if (res == NULL)
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GST_WARNING ("PID:0x%04x table_id:0x%02x, Failed to parse section",
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section->pid, section->table_id);
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else
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section->destroy_parsed = destroynotify;
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return res;
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}
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/*
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* GENERIC MPEG-TS SECTION
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*/
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static void
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_gst_mpegts_section_free (GstMpegtsSection * section)
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{
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GST_DEBUG ("Freeing section type %d", section->section_type);
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if (section->cached_parsed && section->destroy_parsed)
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section->destroy_parsed (section->cached_parsed);
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g_free (section->data);
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g_slice_free (GstMpegtsSection, section);
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}
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static GstMpegtsSection *
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_gst_mpegts_section_copy (GstMpegtsSection * section)
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{
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GstMpegtsSection *copy;
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copy = g_slice_new0 (GstMpegtsSection);
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gst_mini_object_init (GST_MINI_OBJECT_CAST (copy), 0, MPEG_TYPE_TS_SECTION,
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(GstMiniObjectCopyFunction) _gst_mpegts_section_copy, NULL,
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(GstMiniObjectFreeFunction) _gst_mpegts_section_free);
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copy->section_type = section->section_type;
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copy->pid = section->pid;
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copy->table_id = section->table_id;
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copy->subtable_extension = section->subtable_extension;
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copy->version_number = section->version_number;
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copy->current_next_indicator = section->current_next_indicator;
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copy->section_number = section->section_number;
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copy->last_section_number = section->last_section_number;
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copy->crc = section->crc;
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copy->data = g_memdup2 (section->data, section->section_length);
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copy->section_length = section->section_length;
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/* Note: We do not copy the cached parsed item, it will be
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* reconstructed on that copy */
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copy->cached_parsed = NULL;
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copy->offset = section->offset;
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copy->short_section = section->short_section;
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return copy;
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}
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/**
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* gst_mpegts_section_get_data:
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* @section: a #GstMpegtsSection
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*
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* Gets the original unparsed section data.
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*
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* Returns: (transfer full): The original unparsed section data.
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*/
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GBytes *
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gst_mpegts_section_get_data (GstMpegtsSection * section)
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{
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return g_bytes_new (section->data, section->section_length);
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}
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/**
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* gst_message_parse_mpegts_section:
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* @message: a #GstMessage
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*
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* Returns the #GstMpegtsSection contained in a message.
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*
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* Returns: (transfer full): the contained #GstMpegtsSection, or %NULL.
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*/
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GstMpegtsSection *
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gst_message_parse_mpegts_section (GstMessage * message)
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{
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const GstStructure *st;
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GstMpegtsSection *section;
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if (message->type != GST_MESSAGE_ELEMENT)
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return NULL;
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st = gst_message_get_structure (message);
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/* FIXME : Add checks against know section names */
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if (!gst_structure_id_get (st, QUARK_SECTION, GST_TYPE_MPEGTS_SECTION,
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§ion, NULL))
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return NULL;
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return section;
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}
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static GstStructure *
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_mpegts_section_get_structure (GstMpegtsSection * section)
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{
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GstStructure *st;
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GQuark quark;
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switch (section->section_type) {
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case GST_MPEGTS_SECTION_PAT:
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quark = QUARK_PAT;
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break;
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case GST_MPEGTS_SECTION_PMT:
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quark = QUARK_PMT;
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break;
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case GST_MPEGTS_SECTION_CAT:
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quark = QUARK_CAT;
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break;
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case GST_MPEGTS_SECTION_EIT:
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quark = QUARK_EIT;
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break;
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case GST_MPEGTS_SECTION_BAT:
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quark = QUARK_BAT;
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break;
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case GST_MPEGTS_SECTION_NIT:
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quark = QUARK_NIT;
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break;
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case GST_MPEGTS_SECTION_SDT:
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quark = QUARK_SDT;
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break;
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case GST_MPEGTS_SECTION_TDT:
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quark = QUARK_TDT;
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break;
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case GST_MPEGTS_SECTION_TOT:
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quark = QUARK_TOT;
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break;
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case GST_MPEGTS_SECTION_SCTE_SIT:
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quark = QUARK_SCTE_SIT;
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break;
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default:
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GST_DEBUG ("Creating structure for unknown GstMpegtsSection");
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quark = QUARK_SECTION;
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break;
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}
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st = gst_structure_new_id (quark, QUARK_SECTION, MPEG_TYPE_TS_SECTION,
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section, NULL);
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return st;
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}
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/**
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* gst_message_new_mpegts_section:
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* @parent: (transfer none): The creator of the message
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* @section: (transfer none): The #GstMpegtsSection to put in a message
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*
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* Creates a new #GstMessage for a @GstMpegtsSection.
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*
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* Returns: (transfer full): The new #GstMessage to be posted, or %NULL if the
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* section is not valid.
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*/
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GstMessage *
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gst_message_new_mpegts_section (GstObject * parent, GstMpegtsSection * section)
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{
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GstMessage *msg;
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GstStructure *st;
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st = _mpegts_section_get_structure (section);
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msg = gst_message_new_element (parent, st);
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return msg;
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}
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/**
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* gst_event_new_mpegts_section:
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* @section: (transfer none): The #GstMpegtsSection to put in a message
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*
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* Creates a new #GstEvent for a #GstMpegtsSection.
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*
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* Returns: (transfer full): The new custom #GstEvent.
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* Since: 1.20
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*/
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GstEvent *
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gst_event_new_mpegts_section (GstMpegtsSection * section)
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{
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GstStructure *structure;
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GstEvent *event;
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structure = _mpegts_section_get_structure (section);
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event = gst_event_new_custom (GST_EVENT_CUSTOM_DOWNSTREAM, structure);
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return event;
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}
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/**
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* gst_event_parse_mpegts_section:
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* @event: (transfer none): #GstEvent containing a #GstMpegtsSection
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*
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* Extracts the #GstMpegtsSection contained in the @event #GstEvent
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*
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* Returns: (transfer full): The extracted #GstMpegtsSection , or %NULL if the
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* event did not contain a valid #GstMpegtsSection.
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*/
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GstMpegtsSection *
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gst_event_parse_mpegts_section (GstEvent * event)
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{
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const GstStructure *structure;
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GstMpegtsSection *section;
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|
|
structure = gst_event_get_structure (event);
|
|
|
|
if (!structure)
|
|
return NULL;
|
|
|
|
if (!gst_structure_id_get (structure, QUARK_SECTION, MPEG_TYPE_TS_SECTION,
|
|
§ion, NULL))
|
|
return NULL;
|
|
|
|
return section;
|
|
}
|
|
|
|
/**
|
|
* gst_mpegts_section_send_event:
|
|
* @element: (transfer none): The #GstElement to send to section event to
|
|
* @section: (transfer none): The #GstMpegtsSection to put in the event
|
|
*
|
|
* Creates a custom #GstEvent with a @GstMpegtsSection and send it the @element
|
|
* #GstElement.
|
|
*
|
|
* Returns: %TRUE if the event was sent to the element.
|
|
*/
|
|
gboolean
|
|
gst_mpegts_section_send_event (GstMpegtsSection * section, GstElement * element)
|
|
{
|
|
GstEvent *event;
|
|
|
|
g_return_val_if_fail (section != NULL, FALSE);
|
|
g_return_val_if_fail (element != NULL, FALSE);
|
|
|
|
event = gst_event_new_mpegts_section (section);
|
|
|
|
if (!gst_element_send_event (element, event)) {
|
|
gst_event_unref (event);
|
|
return FALSE;
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
static GstMpegtsPatProgram *
|
|
_mpegts_pat_program_copy (GstMpegtsPatProgram * orig)
|
|
{
|
|
return g_slice_dup (GstMpegtsPatProgram, orig);
|
|
}
|
|
|
|
static void
|
|
_mpegts_pat_program_free (GstMpegtsPatProgram * orig)
|
|
{
|
|
g_slice_free (GstMpegtsPatProgram, orig);
|
|
}
|
|
|
|
G_DEFINE_BOXED_TYPE (GstMpegtsPatProgram, gst_mpegts_pat_program,
|
|
(GBoxedCopyFunc) _mpegts_pat_program_copy,
|
|
(GFreeFunc) _mpegts_pat_program_free);
|
|
|
|
/* Program Association Table */
|
|
static gpointer
|
|
_parse_pat (GstMpegtsSection * section)
|
|
{
|
|
GPtrArray *pat;
|
|
guint16 i, 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_ptr_array_new_full (nb_programs,
|
|
(GDestroyNotify) _mpegts_pat_program_free);
|
|
|
|
GST_LOG ("nb_programs %u", nb_programs);
|
|
|
|
for (i = 0; i < nb_programs; i++) {
|
|
program = g_slice_new0 (GstMpegtsPatProgram);
|
|
program->program_number = GST_READ_UINT16_BE (data);
|
|
data += 2;
|
|
|
|
program->network_or_program_map_PID = GST_READ_UINT16_BE (data) & 0x1FFF;
|
|
data += 2;
|
|
|
|
g_ptr_array_index (pat, i) = program;
|
|
}
|
|
pat->len = nb_programs;
|
|
|
|
if (data != end - 4) {
|
|
GST_ERROR ("at the end of PAT data != end - 4");
|
|
g_ptr_array_unref (pat);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
return (gpointer) 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_stream_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
|
|
* or the @section did not contain a valid PAT. Release with #g_ptr_array_unref
|
|
* when done.
|
|
*/
|
|
GPtrArray *
|
|
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)
|
|
section->cached_parsed =
|
|
__common_section_checks (section, 12, _parse_pat,
|
|
(GDestroyNotify) g_ptr_array_unref);
|
|
|
|
if (section->cached_parsed)
|
|
return g_ptr_array_ref ((GPtrArray *) section->cached_parsed);
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* gst_mpegts_pat_new:
|
|
*
|
|
* Allocates a new #GPtrArray for #GstMpegtsPatProgram. The array can be filled
|
|
* and then converted to a PAT section with gst_mpegts_section_from_pat().
|
|
*
|
|
* Returns: (transfer full) (element-type GstMpegtsPatProgram): A newly allocated #GPtrArray
|
|
*/
|
|
GPtrArray *
|
|
gst_mpegts_pat_new (void)
|
|
{
|
|
GPtrArray *pat;
|
|
|
|
pat = g_ptr_array_new_with_free_func (
|
|
(GDestroyNotify) _mpegts_pat_program_free);
|
|
|
|
return pat;
|
|
}
|
|
|
|
/**
|
|
* gst_mpegts_pat_program_new:
|
|
*
|
|
* Allocates a new #GstMpegtsPatProgram.
|
|
*
|
|
* Returns: (transfer full): A newly allocated #GstMpegtsPatProgram
|
|
*/
|
|
GstMpegtsPatProgram *
|
|
gst_mpegts_pat_program_new (void)
|
|
{
|
|
GstMpegtsPatProgram *program;
|
|
|
|
program = g_slice_new0 (GstMpegtsPatProgram);
|
|
|
|
return program;
|
|
}
|
|
|
|
static gboolean
|
|
_packetize_pat (GstMpegtsSection * section)
|
|
{
|
|
GPtrArray *programs;
|
|
guint8 *data;
|
|
gsize length;
|
|
guint i;
|
|
|
|
programs = gst_mpegts_section_get_pat (section);
|
|
|
|
if (programs == NULL)
|
|
return FALSE;
|
|
|
|
/* 8 byte common section fields
|
|
4 byte CRC */
|
|
length = 12;
|
|
|
|
/* 2 byte program number
|
|
2 byte program/network PID */
|
|
length += programs->len * 4;
|
|
|
|
_packetize_common_section (section, length);
|
|
data = section->data + 8;
|
|
|
|
for (i = 0; i < programs->len; i++) {
|
|
GstMpegtsPatProgram *program;
|
|
|
|
program = g_ptr_array_index (programs, i);
|
|
|
|
/* program_number - 16 bit uimsbf */
|
|
GST_WRITE_UINT16_BE (data, program->program_number);
|
|
data += 2;
|
|
|
|
/* reserved - 3 bit
|
|
program/network_PID - 13 uimsbf */
|
|
GST_WRITE_UINT16_BE (data, program->network_or_program_map_PID | 0xE000);
|
|
data += 2;
|
|
}
|
|
|
|
g_ptr_array_unref (programs);
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
/**
|
|
* gst_mpegts_section_from_pat:
|
|
* @programs: (transfer full) (element-type GstMpegtsPatProgram): an array of #GstMpegtsPatProgram
|
|
* @ts_id: Transport stream ID of the PAT
|
|
*
|
|
* Creates a PAT #GstMpegtsSection from the @programs array of #GstMpegtsPatPrograms
|
|
*
|
|
* Returns: (transfer full): a #GstMpegtsSection
|
|
*/
|
|
GstMpegtsSection *
|
|
gst_mpegts_section_from_pat (GPtrArray * programs, guint16 ts_id)
|
|
{
|
|
GstMpegtsSection *section;
|
|
|
|
section = _gst_mpegts_section_init (0x00,
|
|
GST_MTS_TABLE_ID_PROGRAM_ASSOCIATION);
|
|
|
|
section->subtable_extension = ts_id;
|
|
section->cached_parsed = (gpointer) programs;
|
|
section->packetizer = _packetize_pat;
|
|
section->destroy_parsed = (GDestroyNotify) g_ptr_array_unref;
|
|
|
|
return section;
|
|
}
|
|
|
|
/* Program Map Table */
|
|
|
|
static GstMpegtsPMTStream *
|
|
_gst_mpegts_pmt_stream_copy (GstMpegtsPMTStream * pmt)
|
|
{
|
|
GstMpegtsPMTStream *copy;
|
|
|
|
copy = g_slice_dup (GstMpegtsPMTStream, pmt);
|
|
copy->descriptors = g_ptr_array_ref (pmt->descriptors);
|
|
|
|
return copy;
|
|
}
|
|
|
|
static void
|
|
_gst_mpegts_pmt_stream_free (GstMpegtsPMTStream * pmt)
|
|
{
|
|
if (pmt->descriptors)
|
|
g_ptr_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)
|
|
{
|
|
GstMpegtsPMT *copy;
|
|
|
|
copy = g_slice_dup (GstMpegtsPMT, pmt);
|
|
if (pmt->descriptors)
|
|
copy->descriptors = g_ptr_array_ref (pmt->descriptors);
|
|
copy->streams = g_ptr_array_ref (pmt->streams);
|
|
|
|
return copy;
|
|
}
|
|
|
|
static void
|
|
_gst_mpegts_pmt_free (GstMpegtsPMT * pmt)
|
|
{
|
|
if (pmt->descriptors)
|
|
g_ptr_array_unref (pmt->descriptors);
|
|
if (pmt->streams)
|
|
g_ptr_array_unref (pmt->streams);
|
|
g_slice_free (GstMpegtsPMT, pmt);
|
|
}
|
|
|
|
G_DEFINE_BOXED_TYPE (GstMpegtsPMT, gst_mpegts_pmt,
|
|
(GBoxedCopyFunc) _gst_mpegts_pmt_copy, (GFreeFunc) _gst_mpegts_pmt_free);
|
|
|
|
|
|
static gpointer
|
|
_parse_pmt (GstMpegtsSection * section)
|
|
{
|
|
GstMpegtsPMT *pmt = NULL;
|
|
guint i = 0, allocated_streams = 8;
|
|
guint8 *data, *end;
|
|
guint program_info_length;
|
|
guint stream_info_length;
|
|
|
|
pmt = g_slice_new0 (GstMpegtsPMT);
|
|
|
|
data = section->data;
|
|
end = data + section->section_length;
|
|
|
|
GST_DEBUG ("Parsing %d Program Map Table", section->subtable_extension);
|
|
|
|
/* Assign program number from subtable extension,
|
|
and skip already parsed data */
|
|
pmt->program_number = section->subtable_extension;
|
|
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;
|
|
}
|
|
|
|
/* Section length was longer than the actual content of the PMT */
|
|
if (data < end - 4)
|
|
goto error;
|
|
|
|
/* Ensure we did not read after the end of our array */
|
|
g_assert (data == end - 4);
|
|
|
|
return (gpointer) pmt;
|
|
|
|
error:
|
|
if (pmt)
|
|
_gst_mpegts_pmt_free (pmt);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* gst_mpegts_section_get_pmt:
|
|
* @section: a #GstMpegtsSection of type %GST_MPEGTS_SECTION_PMT
|
|
*
|
|
* Parses the Program Map Table 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)
|
|
section->cached_parsed =
|
|
__common_section_checks (section, 16, _parse_pmt,
|
|
(GDestroyNotify) _gst_mpegts_pmt_free);
|
|
|
|
return (const GstMpegtsPMT *) section->cached_parsed;
|
|
}
|
|
|
|
/**
|
|
* gst_mpegts_pmt_new:
|
|
*
|
|
* Allocates and initializes a new #GstMpegtsPMT. #GstMpegtsPMTStream can be
|
|
* added to the streams array, and global PMT #GstMpegtsDescriptor to the
|
|
* descriptors array.
|
|
*
|
|
* Returns: (transfer full): #GstMpegtsPMT
|
|
*/
|
|
GstMpegtsPMT *
|
|
gst_mpegts_pmt_new (void)
|
|
{
|
|
GstMpegtsPMT *pmt;
|
|
|
|
pmt = g_slice_new0 (GstMpegtsPMT);
|
|
|
|
pmt->descriptors = g_ptr_array_new_with_free_func ((GDestroyNotify)
|
|
gst_mpegts_descriptor_free);
|
|
pmt->streams = g_ptr_array_new_with_free_func ((GDestroyNotify)
|
|
_gst_mpegts_pmt_stream_free);
|
|
|
|
return pmt;
|
|
}
|
|
|
|
/**
|
|
* gst_mpegts_pmt_stream_new:
|
|
*
|
|
* Allocates and initializes a new #GstMpegtsPMTStream.
|
|
*
|
|
* Returns: (transfer full): #GstMpegtsPMTStream
|
|
*/
|
|
GstMpegtsPMTStream *
|
|
gst_mpegts_pmt_stream_new (void)
|
|
{
|
|
GstMpegtsPMTStream *stream;
|
|
|
|
stream = g_slice_new0 (GstMpegtsPMTStream);
|
|
|
|
stream->descriptors = g_ptr_array_new_with_free_func ((GDestroyNotify)
|
|
gst_mpegts_descriptor_free);
|
|
|
|
return stream;
|
|
}
|
|
|
|
static gboolean
|
|
_packetize_pmt (GstMpegtsSection * section)
|
|
{
|
|
const GstMpegtsPMT *pmt;
|
|
GstMpegtsPMTStream *stream;
|
|
GstMpegtsDescriptor *descriptor;
|
|
gsize length, pgm_info_length, stream_length;
|
|
guint8 *data;
|
|
guint i, j;
|
|
|
|
pmt = gst_mpegts_section_get_pmt (section);
|
|
|
|
if (pmt == NULL)
|
|
return FALSE;
|
|
|
|
/* 8 byte common section fields
|
|
2 byte PCR pid
|
|
2 byte program info length
|
|
4 byte CRC */
|
|
length = 16;
|
|
|
|
/* Find length of program info */
|
|
pgm_info_length = 0;
|
|
if (pmt->descriptors) {
|
|
for (i = 0; i < pmt->descriptors->len; i++) {
|
|
descriptor = g_ptr_array_index (pmt->descriptors, i);
|
|
pgm_info_length += descriptor->length + 2;
|
|
}
|
|
}
|
|
|
|
/* Find length of PMT streams */
|
|
stream_length = 0;
|
|
if (pmt->streams) {
|
|
for (i = 0; i < pmt->streams->len; i++) {
|
|
stream = g_ptr_array_index (pmt->streams, i);
|
|
|
|
/* 1 byte stream type
|
|
2 byte PID
|
|
2 byte ES info length */
|
|
stream_length += 5;
|
|
|
|
if (stream->descriptors) {
|
|
for (j = 0; j < stream->descriptors->len; j++) {
|
|
descriptor = g_ptr_array_index (stream->descriptors, j);
|
|
stream_length += descriptor->length + 2;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
length += pgm_info_length + stream_length;
|
|
|
|
_packetize_common_section (section, length);
|
|
data = section->data + 8;
|
|
|
|
/* reserved - 3 bit
|
|
PCR_PID - 13 uimsbf */
|
|
GST_WRITE_UINT16_BE (data, pmt->pcr_pid | 0xE000);
|
|
data += 2;
|
|
|
|
/* reserved - 4 bit
|
|
program_info_length - 12 uimsbf */
|
|
GST_WRITE_UINT16_BE (data, pgm_info_length | 0xF000);
|
|
data += 2;
|
|
|
|
_packetize_descriptor_array (pmt->descriptors, &data);
|
|
|
|
if (pmt->streams) {
|
|
guint8 *pos;
|
|
|
|
for (i = 0; i < pmt->streams->len; i++) {
|
|
stream = g_ptr_array_index (pmt->streams, i);
|
|
/* stream_type - 8 bit uimsbf */
|
|
*data++ = stream->stream_type;
|
|
|
|
/* reserved - 3 bit
|
|
elementary_PID - 13 bit uimsbf */
|
|
GST_WRITE_UINT16_BE (data, stream->pid | 0xE000);
|
|
data += 2;
|
|
|
|
/* reserved - 4 bit
|
|
ES_info_length - 12 bit uimsbf */
|
|
pos = data;
|
|
data += 2;
|
|
_packetize_descriptor_array (stream->descriptors, &data);
|
|
|
|
/* Go back and update descriptor length */
|
|
GST_WRITE_UINT16_BE (pos, (data - pos - 2) | 0xF000);
|
|
}
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
/**
|
|
* gst_mpegts_section_from_pmt:
|
|
* @pmt: (transfer full): a #GstMpegtsPMT to create a #GstMpegtsSection from
|
|
* @pid: The PID that the #GstMpegtsPMT belongs to
|
|
*
|
|
* Creates a #GstMpegtsSection from @pmt that is bound to @pid
|
|
*
|
|
* Returns: (transfer full): #GstMpegtsSection
|
|
*/
|
|
GstMpegtsSection *
|
|
gst_mpegts_section_from_pmt (GstMpegtsPMT * pmt, guint16 pid)
|
|
{
|
|
GstMpegtsSection *section;
|
|
|
|
g_return_val_if_fail (pmt != NULL, NULL);
|
|
|
|
section = _gst_mpegts_section_init (pid, GST_MTS_TABLE_ID_TS_PROGRAM_MAP);
|
|
|
|
section->subtable_extension = pmt->program_number;
|
|
section->cached_parsed = (gpointer) pmt;
|
|
section->packetizer = _packetize_pmt;
|
|
section->destroy_parsed = (GDestroyNotify) _gst_mpegts_pmt_free;
|
|
|
|
return section;
|
|
}
|
|
|
|
/* Conditional Access Table */
|
|
static gpointer
|
|
_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 (gpointer) gst_mpegts_parse_descriptors (data, desc_len);
|
|
}
|
|
|
|
/**
|
|
* gst_mpegts_section_get_cat:
|
|
* @section: a #GstMpegtsSection of type %GST_MPEGTS_SECTION_CAT
|
|
*
|
|
* Parses a Conditional Access Table.
|
|
*
|
|
* Returns the array of #GstMpegtsDescriptor contained in the Conditional
|
|
* Access Table.
|
|
*
|
|
* Returns: (transfer container) (element-type GstMpegtsDescriptor): The array
|
|
* of #GstMpegtsDescriptor contained in the section, or %NULL if an error
|
|
* happened. Release with #g_array_unref when done.
|
|
*/
|
|
GPtrArray *
|
|
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 =
|
|
__common_section_checks (section, 12, _parse_cat,
|
|
(GDestroyNotify) g_ptr_array_unref);
|
|
|
|
if (section->cached_parsed)
|
|
return g_ptr_array_ref ((GPtrArray *) section->cached_parsed);
|
|
return NULL;
|
|
}
|
|
|
|
/* Transport Stream Description Table (TSDT) */
|
|
/**
|
|
* gst_mpegts_section_get_tsdt:
|
|
* @section: a #GstMpegtsSection of type %GST_MPEGTS_SECTION_TSDT
|
|
*
|
|
* Parses a Transport Stream Description Table.
|
|
*
|
|
* Returns the array of #GstMpegtsDescriptor contained in the section
|
|
*
|
|
* Returns: (transfer container) (element-type GstMpegtsDescriptor): The array
|
|
* of #GstMpegtsDescriptor contained in the section, or %NULL if an error
|
|
* happened. Release with #g_array_unref when done.
|
|
*/
|
|
GPtrArray *
|
|
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_ptr_array_ref ((GPtrArray *) section->cached_parsed);
|
|
|
|
/* FIXME : parse TSDT */
|
|
return NULL;
|
|
}
|
|
|
|
|
|
|
|
static GstMpegtsSectionType
|
|
_identify_section (guint16 pid, guint8 table_id)
|
|
{
|
|
switch (table_id) {
|
|
case GST_MTS_TABLE_ID_PROGRAM_ASSOCIATION:
|
|
if (pid == 0x00)
|
|
return GST_MPEGTS_SECTION_PAT;
|
|
break;
|
|
case GST_MTS_TABLE_ID_CONDITIONAL_ACCESS:
|
|
if (pid == 0x01)
|
|
return GST_MPEGTS_SECTION_CAT;
|
|
break;
|
|
case GST_MTS_TABLE_ID_TS_PROGRAM_MAP:
|
|
return GST_MPEGTS_SECTION_PMT;
|
|
case GST_MTS_TABLE_ID_BOUQUET_ASSOCIATION:
|
|
if (pid == 0x0011)
|
|
return GST_MPEGTS_SECTION_BAT;
|
|
break;
|
|
case GST_MTS_TABLE_ID_NETWORK_INFORMATION_ACTUAL_NETWORK:
|
|
case GST_MTS_TABLE_ID_NETWORK_INFORMATION_OTHER_NETWORK:
|
|
if (pid == 0x0010)
|
|
return GST_MPEGTS_SECTION_NIT;
|
|
break;
|
|
case GST_MTS_TABLE_ID_SERVICE_DESCRIPTION_ACTUAL_TS:
|
|
case GST_MTS_TABLE_ID_SERVICE_DESCRIPTION_OTHER_TS:
|
|
if (pid == 0x0011)
|
|
return GST_MPEGTS_SECTION_SDT;
|
|
break;
|
|
case GST_MTS_TABLE_ID_TIME_DATE:
|
|
if (pid == 0x0014)
|
|
return GST_MPEGTS_SECTION_TDT;
|
|
break;
|
|
case GST_MTS_TABLE_ID_TIME_OFFSET:
|
|
if (pid == 0x0014)
|
|
return GST_MPEGTS_SECTION_TOT;
|
|
break;
|
|
case GST_MTS_TABLE_ID_ATSC_TERRESTRIAL_VIRTUAL_CHANNEL:
|
|
if (pid == 0x1ffb)
|
|
return GST_MPEGTS_SECTION_ATSC_TVCT;
|
|
break;
|
|
case GST_MTS_TABLE_ID_ATSC_CABLE_VIRTUAL_CHANNEL:
|
|
if (pid == 0x1ffb)
|
|
return GST_MPEGTS_SECTION_ATSC_CVCT;
|
|
break;
|
|
case GST_MTS_TABLE_ID_ATSC_MASTER_GUIDE:
|
|
if (pid == 0x1ffb)
|
|
return GST_MPEGTS_SECTION_ATSC_MGT;
|
|
break;
|
|
case GST_MTS_TABLE_ID_ATSC_EVENT_INFORMATION:
|
|
/* FIXME check pids reported on the MGT to confirm expectations */
|
|
return GST_MPEGTS_SECTION_ATSC_EIT;
|
|
case GST_MTS_TABLE_ID_ATSC_CHANNEL_OR_EVENT_EXTENDED_TEXT:
|
|
/* FIXME check pids reported on the MGT to confirm expectations */
|
|
return GST_MPEGTS_SECTION_ATSC_ETT;
|
|
/* FIXME : FILL */
|
|
case GST_MTS_TABLE_ID_ATSC_SYSTEM_TIME:
|
|
if (pid == 0x1ffb)
|
|
return GST_MPEGTS_SECTION_ATSC_STT;
|
|
break;
|
|
case GST_MTS_TABLE_ID_ATSC_RATING_REGION:
|
|
if (pid == 0x1ffb)
|
|
return GST_MPEGTS_SECTION_ATSC_RRT;
|
|
break;
|
|
case GST_MTS_TABLE_ID_SCTE_SPLICE:
|
|
return GST_MPEGTS_SECTION_SCTE_SIT;
|
|
break;
|
|
case GST_MTS_TABLE_ID_SELECTION_INFORMATION:
|
|
if (pid == 0x001f)
|
|
return GST_MPEGTS_SECTION_SIT;
|
|
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) {
|
|
if (pid == 0x0012)
|
|
return GST_MPEGTS_SECTION_EIT;
|
|
}
|
|
return GST_MPEGTS_SECTION_UNKNOWN;
|
|
}
|
|
return GST_MPEGTS_SECTION_UNKNOWN;
|
|
|
|
}
|
|
|
|
GstMpegtsSection *
|
|
_gst_mpegts_section_init (guint16 pid, guint8 table_id)
|
|
{
|
|
GstMpegtsSection *section;
|
|
|
|
section = g_slice_new0 (GstMpegtsSection);
|
|
gst_mini_object_init (GST_MINI_OBJECT_CAST (section), 0, MPEG_TYPE_TS_SECTION,
|
|
(GstMiniObjectCopyFunction) _gst_mpegts_section_copy, NULL,
|
|
(GstMiniObjectFreeFunction) _gst_mpegts_section_free);
|
|
|
|
section->pid = pid;
|
|
section->table_id = table_id;
|
|
section->current_next_indicator = TRUE;
|
|
section->section_type = _identify_section (pid, table_id);
|
|
|
|
return section;
|
|
}
|
|
|
|
void
|
|
_packetize_common_section (GstMpegtsSection * section, gsize length)
|
|
{
|
|
guint8 *data;
|
|
|
|
section->section_length = length;
|
|
data = section->data = g_malloc (length);
|
|
|
|
/* table_id - 8 bit uimsbf */
|
|
*data++ = section->table_id;
|
|
|
|
/* section_syntax_indicator - 1 bit
|
|
reserved - 3 bit
|
|
section_length - 12 bit uimsbf */
|
|
switch (section->section_type) {
|
|
case GST_MPEGTS_SECTION_PAT:
|
|
case GST_MPEGTS_SECTION_PMT:
|
|
case GST_MPEGTS_SECTION_CAT:
|
|
case GST_MPEGTS_SECTION_TSDT:
|
|
case GST_MPEGTS_SECTION_SCTE_SIT:
|
|
/* Tables from ISO/IEC 13818-1 has a '0' bit
|
|
* after the section_syntax_indicator */
|
|
/* FIXME : that 'bit' after the section_syntax_indicator is the
|
|
* private_indicator field. We should figure out why/when it
|
|
* needs to be set *OR* decide that by default it is set to 0
|
|
* (i.e. not private data) unless the user/caller decides */
|
|
GST_WRITE_UINT16_BE (data, (section->section_length - 3) | 0x3000);
|
|
break;
|
|
default:
|
|
GST_WRITE_UINT16_BE (data, (section->section_length - 3) | 0x7000);
|
|
}
|
|
|
|
/* short sections do not contain any further fields */
|
|
if (section->short_section)
|
|
return;
|
|
|
|
/* Set section_syntax_indicator bit since we do not have a short section */
|
|
*data |= 0x80;
|
|
data += 2;
|
|
|
|
/* subtable_extension - 16 bit uimsbf */
|
|
GST_WRITE_UINT16_BE (data, section->subtable_extension);
|
|
data += 2;
|
|
|
|
/* reserved - 2 bit
|
|
version_number - 5 bit uimsbf
|
|
current_next_indicator - 1 bit */
|
|
*data++ = 0xC0 |
|
|
((section->version_number & 0x1F) << 1) |
|
|
(section->current_next_indicator & 0x01);
|
|
|
|
/* section_number - 8 bit uimsbf */
|
|
*data++ = section->section_number;
|
|
/* last_section_number - 8 bit uimsbf */
|
|
*data++ = section->last_section_number;
|
|
}
|
|
|
|
/**
|
|
* gst_mpegts_section_new:
|
|
* @pid: the PID to which this section belongs
|
|
* @data: (transfer full) (array length=data_size): 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;
|
|
guint8 table_id;
|
|
guint16 section_length = 0;
|
|
|
|
/* The smallest section ever is 3 bytes */
|
|
if (G_UNLIKELY (data_size < 3))
|
|
goto short_packet;
|
|
|
|
/* Check for length */
|
|
section_length = GST_READ_UINT16_BE (data + 1) & 0x0FFF;
|
|
if (G_UNLIKELY (data_size < section_length + 3))
|
|
goto short_packet;
|
|
|
|
GST_LOG ("data_size:%" G_GSIZE_FORMAT " section_length:%u",
|
|
data_size, section_length);
|
|
|
|
/* Table id is in first byte */
|
|
table_id = *data;
|
|
|
|
res = _gst_mpegts_section_init (pid, table_id);
|
|
|
|
res->data = data;
|
|
/* table_id (already parsed) : 8 bit */
|
|
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) {
|
|
/* A long packet needs to be at least 11 bytes long
|
|
* _ 3 for the bytes above
|
|
* _ 5 for the bytes below
|
|
* _ 4 for the CRC */
|
|
if (G_UNLIKELY (data_size < 11))
|
|
goto bad_long_packet;
|
|
|
|
/* 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;
|
|
}
|
|
|
|
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);
|
|
g_free (data);
|
|
return NULL;
|
|
}
|
|
bad_long_packet:
|
|
{
|
|
GST_WARNING ("PID 0x%04x long section is too short (%" G_GSIZE_FORMAT
|
|
" bytes, need at least 11)", pid, data_size);
|
|
gst_mpegts_section_unref (res);
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_mpegts_section_packetize:
|
|
* @section: (transfer none): the #GstMpegtsSection that holds the data
|
|
* @output_size: (out): #gsize to hold the size of the data
|
|
*
|
|
* Packetize (i.e. serialize) the @section. If the data in @section has already
|
|
* been packetized, the data pointer is returned immediately. Otherwise, the
|
|
* data field is allocated and populated.
|
|
*
|
|
* Returns: (transfer none): pointer to section data, or %NULL on failure.
|
|
*/
|
|
guint8 *
|
|
gst_mpegts_section_packetize (GstMpegtsSection * section, gsize * output_size)
|
|
{
|
|
guint8 *crc;
|
|
g_return_val_if_fail (section != NULL, NULL);
|
|
g_return_val_if_fail (output_size != NULL, NULL);
|
|
|
|
/* Section data has already been packetized */
|
|
if (section->data) {
|
|
*output_size = section->section_length;
|
|
return section->data;
|
|
}
|
|
|
|
g_return_val_if_fail (section->packetizer != NULL, NULL);
|
|
|
|
if (!section->packetizer (section))
|
|
return NULL;
|
|
|
|
if (!section->short_section) {
|
|
/* Update the CRC in the last 4 bytes of the section */
|
|
crc = section->data + section->section_length - 4;
|
|
GST_WRITE_UINT32_BE (crc, _calc_crc32 (section->data, crc - section->data));
|
|
}
|
|
|
|
*output_size = section->section_length;
|
|
|
|
return section->data;
|
|
}
|
|
|
|
void
|
|
__initialize_sections (void)
|
|
{
|
|
/* 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_SCTE_SIT = g_quark_from_string ("scte-sit");
|
|
QUARK_SECTION = g_quark_from_string ("section");
|
|
}
|