| /* |
| * gstmpegtssection.c - |
| * Copyright (C) 2013 Edward Hervey |
| * Copyright (C) 2011, Hewlett-Packard Development Company, L.P. |
| * Copyright (C) 2007 Alessandro Decina |
| * 2010 Edward Hervey |
| * Author: Youness Alaoui <youness.alaoui@collabora.co.uk>, Collabora Ltd. |
| * Author: Sebastian Dröge <sebastian.droege@collabora.co.uk>, Collabora Ltd. |
| * Author: Edward Hervey <bilboed@bilboed.com>, Collabora Ltd. |
| * |
| * Authors: |
| * Alessandro Decina <alessandro@nnva.org> |
| * Zaheer Abbas Merali <zaheerabbas at merali dot org> |
| * Edward Hervey <edward@collabora.com> |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Library General Public |
| * License as published by the Free Software Foundation; either |
| * version 2 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Library General Public License for more details. |
| * |
| * You should have received a copy of the GNU Library General Public |
| * License along with this library; if not, write to the |
| * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, |
| * Boston, MA 02110-1301, USA. |
| */ |
| |
| #include <string.h> |
| #include <stdlib.h> |
| |
| #include "mpegts.h" |
| #include "gstmpegts-private.h" |
| |
| /** |
| * SECTION:gstmpegts |
| * @title: Mpeg-ts helper library |
| * @short_description: Mpeg-ts helper library for plugins and applications |
| * @include: gst/mpegts/mpegts.h |
| */ |
| |
| /** |
| * SECTION:gstmpegtssection |
| * @title: Base MPEG-TS sections |
| * @short_description: Sections for ITU H.222.0 | ISO/IEC 13818-1 |
| * @include: gst/mpegts/mpegts.h |
| * |
| * For more details, refer to the ITU H.222.0 or ISO/IEC 13818-1 specifications |
| * and other specifications mentioned 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 relicensed to LGPL from fluendo ts demuxer */ |
| 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; |
| } |
| |
| gpointer |
| __common_section_checks (GstMpegtsSection * section, guint min_size, |
| GstMpegtsParseFunc parsefunc, GDestroyNotify destroynotify) |
| { |
| gpointer res; |
| |
| /* Check section is big enough */ |
| if (section->section_length < min_size) { |
| GST_WARNING |
| ("PID:0x%04x table_id:0x%02x, section too small (Got %d, need at least %d)", |
| section->pid, section->table_id, section->section_length, min_size); |
| return NULL; |
| } |
| |
| /* If section has a CRC, check it */ |
| if (!section->short_section |
| && (_calc_crc32 (section->data, section->section_length) != 0)) { |
| GST_WARNING ("PID:0x%04x table_id:0x%02x, Bad CRC on section", section->pid, |
| section->table_id); |
| return NULL; |
| } |
| |
| /* Finally parse and set the destroy notify */ |
| res = parsefunc (section); |
| if (res == NULL) |
| GST_WARNING ("PID:0x%04x table_id:0x%02x, Failed to parse section", |
| section->pid, section->table_id); |
| else |
| section->destroy_parsed = destroynotify; |
| return res; |
| } |
| |
| |
| /* |
| * GENERIC MPEG-TS SECTION |
| */ |
| static void |
| _gst_mpegts_section_free (GstMpegtsSection * section) |
| { |
| GST_DEBUG ("Freeing section type %d", section->section_type); |
| |
| if (section->cached_parsed && section->destroy_parsed) |
| section->destroy_parsed (section->cached_parsed); |
| |
| 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_mpegts_section_get_data: |
| * @section: a #GstMpegtsSection |
| * |
| * Gets the original unparsed section data. |
| * |
| * Returns: (transfer full): The original unparsed section data. |
| */ |
| GBytes * |
| gst_mpegts_section_get_data (GstMpegtsSection * section) |
| { |
| return g_bytes_new (section->data, section->section_length); |
| } |
| |
| /** |
| * 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, |
| §ion, NULL)) |
| return NULL; |
| |
| return section; |
| } |
| |
| static GstStructure * |
| _mpegts_section_get_structure (GstMpegtsSection * section) |
| { |
| 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_DEBUG ("Creating structure for unknown GstMpegtsSection"); |
| quark = QUARK_SECTION; |
| break; |
| } |
| |
| st = gst_structure_new_id (quark, QUARK_SECTION, MPEG_TYPE_TS_SECTION, |
| section, NULL); |
| |
| return st; |
| } |
| |
| /** |
| * 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; |
| |
| st = _mpegts_section_get_structure (section); |
| |
| msg = gst_message_new_element (parent, st); |
| |
| return msg; |
| } |
| |
| static GstEvent * |
| _mpegts_section_get_event (GstMpegtsSection * section) |
| { |
| GstStructure *structure; |
| GstEvent *event; |
| |
| structure = _mpegts_section_get_structure (section); |
| |
| event = gst_event_new_custom (GST_EVENT_CUSTOM_DOWNSTREAM, structure); |
| |
| return event; |
| } |
| |
| /** |
| * gst_event_parse_mpegts_section: |
| * @event: (transfer none): #GstEvent containing a #GstMpegtsSection |
| * |
| * Extracts the #GstMpegtsSection contained in the @event #GstEvent |
| * |
| * Returns: (transfer full): The extracted #GstMpegtsSection |
| */ |
| GstMpegtsSection * |
| gst_event_parse_mpegts_section (GstEvent * event) |
| { |
| const GstStructure *structure; |
| GstMpegtsSection *section; |
| |
| structure = gst_event_get_structure (event); |
| |
| 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. |
| * The #GstEvent is sent to the @element #GstElement. |
| * |
| * Returns: %TRUE if the event is sent |
| */ |
| 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 = _mpegts_section_get_event (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_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. |
| */ |
| 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 |
| * |
| * 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 |
| * |
| * 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) |
| 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. |
| * |
| * 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 |
| * |
| * Returns the array of #GstMpegtsDescriptor contained in the Conditional |
| * 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. |
| */ |
| 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 |
| * |
| * 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. |
| */ |
| 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; |
| } |
| |
| |
| /** |
| * 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 (); |
| } |
| |
| /* FIXME : Later on we might need to use more than just the table_id |
| * to figure out which type of section this is. */ |
| 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; |
| 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: |
| /* Tables from ISO/IEC 13818-1 has a '0' bit |
| * after the section_syntax_indicator */ |
| 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): 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 |
| * |
| * 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 fail |
| */ |
| 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); |
| g_return_val_if_fail (section->packetizer != NULL, NULL); |
| |
| /* Section data has already been packetized */ |
| if (section->data) { |
| *output_size = section->section_length; |
| return section->data; |
| } |
| |
| 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; |
| } |