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gstreamer/gst/mpegtsdemux/mpegtspacketizer.c
Thibault Saunier 5c2e6dc512 mpegtspacketizer: catch section lengths extending past the buffer length 
This is probably the cause for an occasional crash while streaming
MPEG. Blind fix after staring at the code and following logic, so
may or may not fix the issue, I cannot test.

(Port of 4275a70cb5 from mpegdemux)
2012-02-27 09:57:45 -03:00

3070 lines
99 KiB
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/*
* mpegtspacketizer.c -
* Copyright (C) 2007, 2008 Alessandro Decina, Zaheer Merali
*
* Authors:
* Zaheer Merali <zaheerabbas at merali dot org>
* Alessandro Decina <alessandro@nnva.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include <string.h>
/* FIXME 0.11: suppress warnings for deprecated API such as GValueArray
* with newer GLib versions (>= 2.31.0) */
#define GLIB_DISABLE_DEPRECATION_WARNINGS
/* Skew calculation pameters */
#define MAX_TIME (2 * GST_SECOND)
#include "mpegtspacketizer.h"
#include "gstmpegdesc.h"
GST_DEBUG_CATEGORY_STATIC (mpegts_packetizer_debug);
#define GST_CAT_DEFAULT mpegts_packetizer_debug
static GQuark QUARK_PAT;
static GQuark QUARK_TRANSPORT_STREAM_ID;
static GQuark QUARK_PROGRAM_NUMBER;
static GQuark QUARK_PID;
static GQuark QUARK_PROGRAMS;
static GQuark QUARK_PMT;
static GQuark QUARK_PCR_PID;
static GQuark QUARK_VERSION_NUMBER;
static GQuark QUARK_DESCRIPTORS;
static GQuark QUARK_STREAM_TYPE;
static GQuark QUARK_STREAMS;
static GQuark QUARK_NIT;
static GQuark QUARK_NETWORK_ID;
static GQuark QUARK_CURRENT_NEXT_INDICATOR;
static GQuark QUARK_ACTUAL_NETWORK;
static GQuark QUARK_NETWORK_NAME;
static GQuark QUARK_ORIGINAL_NETWORK_ID;
static GQuark QUARK_TRANSPORTS;
static GQuark QUARK_SDT;
static GQuark QUARK_ACTUAL_TRANSPORT_STREAM;
static GQuark QUARK_SERVICES;
static GQuark QUARK_EIT;
static GQuark QUARK_SERVICE_ID;
static GQuark QUARK_PRESENT_FOLLOWING;
static GQuark QUARK_SEGMENT_LAST_SECTION_NUMBER;
static GQuark QUARK_LAST_TABLE_ID;
static GQuark QUARK_EVENTS;
static void _init_local (void);
G_DEFINE_TYPE_EXTENDED (MpegTSPacketizer2, mpegts_packetizer, G_TYPE_OBJECT, 0,
_init_local ());
static void mpegts_packetizer_dispose (GObject * object);
static void mpegts_packetizer_finalize (GObject * object);
static gchar *convert_to_utf8 (const gchar * text, gint length, guint start,
const gchar * encoding, gboolean is_multibyte, GError ** error);
static gchar *get_encoding (const gchar * text, guint * start_text,
gboolean * is_multibyte);
static gchar *get_encoding_and_convert (const gchar * text, guint length);
static GstClockTime calculate_skew (MpegTSPacketizer2 * packetizer,
guint64 pcrtime, GstClockTime time);
static void mpegts_packetizer_reset_skew (MpegTSPacketizer2 * packetizer);
#define CONTINUITY_UNSET 255
#define MAX_CONTINUITY 15
#define VERSION_NUMBER_UNSET 255
#define TABLE_ID_UNSET 0xFF
#define PACKET_SYNC_BYTE 0x47
static gint
mpegts_packetizer_stream_subtable_compare (gconstpointer a, gconstpointer b)
{
MpegTSPacketizerStreamSubtable *asub, *bsub;
asub = (MpegTSPacketizerStreamSubtable *) a;
bsub = (MpegTSPacketizerStreamSubtable *) b;
if (asub->table_id == bsub->table_id &&
asub->subtable_extension == bsub->subtable_extension)
return 0;
return -1;
}
static MpegTSPacketizerStreamSubtable *
mpegts_packetizer_stream_subtable_new (guint8 table_id,
guint16 subtable_extension)
{
MpegTSPacketizerStreamSubtable *subtable;
subtable = g_new0 (MpegTSPacketizerStreamSubtable, 1);
subtable->version_number = VERSION_NUMBER_UNSET;
subtable->table_id = table_id;
subtable->subtable_extension = subtable_extension;
subtable->crc = 0;
return subtable;
}
static MpegTSPacketizerStream *
mpegts_packetizer_stream_new (void)
{
MpegTSPacketizerStream *stream;
stream = (MpegTSPacketizerStream *) g_new0 (MpegTSPacketizerStream, 1);
stream->section_adapter = gst_adapter_new ();
stream->continuity_counter = CONTINUITY_UNSET;
stream->subtables = NULL;
stream->section_table_id = TABLE_ID_UNSET;
return stream;
}
static void
mpegts_packetizer_stream_free (MpegTSPacketizerStream * stream)
{
gst_adapter_clear (stream->section_adapter);
g_object_unref (stream->section_adapter);
g_slist_foreach (stream->subtables, (GFunc) g_free, NULL);
g_slist_free (stream->subtables);
g_free (stream);
}
static void
mpegts_packetizer_clear_section (MpegTSPacketizer2 * packetizer,
MpegTSPacketizerStream * stream)
{
gst_adapter_clear (stream->section_adapter);
stream->continuity_counter = CONTINUITY_UNSET;
stream->section_length = 0;
stream->section_table_id = TABLE_ID_UNSET;
}
static void
mpegts_packetizer_class_init (MpegTSPacketizer2Class * klass)
{
GObjectClass *gobject_class;
gobject_class = G_OBJECT_CLASS (klass);
gobject_class->dispose = mpegts_packetizer_dispose;
gobject_class->finalize = mpegts_packetizer_finalize;
}
static void
mpegts_packetizer_init (MpegTSPacketizer2 * packetizer)
{
packetizer->adapter = gst_adapter_new ();
packetizer->offset = 0;
packetizer->empty = TRUE;
packetizer->streams = g_new0 (MpegTSPacketizerStream *, 8192);
packetizer->know_packet_size = FALSE;
packetizer->calculate_skew = FALSE;
mpegts_packetizer_reset_skew (packetizer);
}
static void
mpegts_packetizer_dispose (GObject * object)
{
MpegTSPacketizer2 *packetizer = GST_MPEGTS_PACKETIZER (object);
if (!packetizer->disposed) {
if (packetizer->know_packet_size && packetizer->caps != NULL) {
gst_caps_unref (packetizer->caps);
packetizer->caps = NULL;
packetizer->know_packet_size = FALSE;
}
if (packetizer->streams) {
int i;
for (i = 0; i < 8192; i++) {
if (packetizer->streams[i])
mpegts_packetizer_stream_free (packetizer->streams[i]);
}
g_free (packetizer->streams);
}
gst_adapter_clear (packetizer->adapter);
g_object_unref (packetizer->adapter);
packetizer->disposed = TRUE;
packetizer->offset = 0;
packetizer->empty = TRUE;
}
if (G_OBJECT_CLASS (mpegts_packetizer_parent_class)->dispose)
G_OBJECT_CLASS (mpegts_packetizer_parent_class)->dispose (object);
}
static void
mpegts_packetizer_finalize (GObject * object)
{
if (G_OBJECT_CLASS (mpegts_packetizer_parent_class)->finalize)
G_OBJECT_CLASS (mpegts_packetizer_parent_class)->finalize (object);
}
guint64
mpegts_packetizer_compute_pcr (const guint8 * data)
{
guint32 pcr1;
guint16 pcr2;
guint64 pcr, pcr_ext;
pcr1 = GST_READ_UINT32_BE (data);
pcr2 = GST_READ_UINT16_BE (data + 4);
pcr = ((guint64) pcr1) << 1;
pcr |= (pcr2 & 0x8000) >> 15;
pcr_ext = (pcr2 & 0x01ff);
return pcr * 300 + pcr_ext % 300;
}
static gboolean
mpegts_packetizer_parse_adaptation_field_control (MpegTSPacketizer2 *
packetizer, MpegTSPacketizerPacket * packet)
{
guint8 length, afcflags;
guint8 *data;
length = *packet->data++;
/* an adaptation field with length 0 is valid and
* can be used to insert a single stuffing byte */
if (!length) {
packet->afc_flags = 0;
return TRUE;
}
if (packet->adaptation_field_control == 0x02) {
/* no payload, adaptation field of 183 bytes */
if (length != 183) {
GST_DEBUG ("PID %d afc == 0x%x and length %d != 183",
packet->pid, packet->adaptation_field_control, length);
}
} else if (length > 182) {
GST_DEBUG ("PID %d afc == 0x%01x and length %d > 182",
packet->pid, packet->adaptation_field_control, length);
}
if (packet->data + length > packet->data_end) {
GST_DEBUG ("PID %d afc length %d overflows the buffer current %d max %d",
packet->pid, length, (gint) (packet->data - packet->data_start),
(gint) (packet->data_end - packet->data_start));
return FALSE;
}
data = packet->data;
packet->data += length;
afcflags = packet->afc_flags = *data++;
/* PCR */
if (afcflags & MPEGTS_AFC_PCR_FLAG) {
packet->pcr = mpegts_packetizer_compute_pcr (data);
if (packetizer->calculate_skew)
GST_BUFFER_TIMESTAMP (packet->buffer) =
calculate_skew (packetizer, packet->pcr,
GST_BUFFER_TIMESTAMP (packet->buffer));
*data += 6;
}
/* OPCR */
if (afcflags & MPEGTS_AFC_OPCR_FLAG) {
packet->opcr = mpegts_packetizer_compute_pcr (data);
*data += 6;
}
return TRUE;
}
static gboolean
mpegts_packetizer_parse_packet (MpegTSPacketizer2 * packetizer,
MpegTSPacketizerPacket * packet)
{
guint8 *data;
data = packet->data_start;
data++;
packet->payload_unit_start_indicator = (*data >> 6) & 0x01;
packet->pid = GST_READ_UINT16_BE (data) & 0x1FFF;
data += 2;
packet->adaptation_field_control = (*data >> 4) & 0x03;
packet->continuity_counter = *data & 0x0F;
data += 1;
packet->data = data;
if (packet->adaptation_field_control & 0x02)
if (!mpegts_packetizer_parse_adaptation_field_control (packetizer, packet))
return FALSE;
if (packet->adaptation_field_control & 0x01)
packet->payload = packet->data;
else
packet->payload = NULL;
return TRUE;
}
static gboolean
mpegts_packetizer_parse_section_header (MpegTSPacketizer2 * packetizer,
MpegTSPacketizerStream * stream, MpegTSPacketizerSection * section)
{
guint8 tmp;
guint8 *data, *crc_data;
MpegTSPacketizerStreamSubtable *subtable;
GSList *subtable_list = NULL;
section->complete = TRUE;
/* get the section buffer, pass the ownership to the caller */
section->buffer = gst_adapter_take_buffer (stream->section_adapter,
3 + stream->section_length);
data = GST_BUFFER_DATA (section->buffer);
GST_BUFFER_OFFSET (section->buffer) = stream->offset;
section->table_id = *data++;
/* if table_id is 0 (pat) then ignore the subtable extension */
if ((data[0] & 0x80) == 0 || section->table_id == 0)
section->subtable_extension = 0;
else
section->subtable_extension = GST_READ_UINT16_BE (data + 2);
subtable = mpegts_packetizer_stream_subtable_new (section->table_id,
section->subtable_extension);
subtable_list = g_slist_find_custom (stream->subtables, subtable,
mpegts_packetizer_stream_subtable_compare);
if (subtable_list) {
g_free (subtable);
subtable = (MpegTSPacketizerStreamSubtable *) (subtable_list->data);
} else {
stream->subtables = g_slist_prepend (stream->subtables, subtable);
}
section->section_length = GST_READ_UINT16_BE (data) & 0x0FFF;
data += 2;
/* skip to the version byte */
data += 2;
tmp = *data++;
section->version_number = (tmp >> 1) & 0x1F;
section->current_next_indicator = tmp & 0x01;
if (!section->current_next_indicator)
goto not_applicable;
/* CRC is at the end of the section */
crc_data =
GST_BUFFER_DATA (section->buffer) + GST_BUFFER_SIZE (section->buffer) - 4;
section->crc = GST_READ_UINT32_BE (crc_data);
if (section->version_number == subtable->version_number &&
section->crc == subtable->crc)
goto not_applicable;
subtable->version_number = section->version_number;
subtable->crc = section->crc;
stream->section_table_id = section->table_id;
return TRUE;
not_applicable:
GST_LOG
("not applicable pid %d table_id %d subtable_extension %d, current_next %d version %d, crc 0x%x",
section->pid, section->table_id, section->subtable_extension,
section->current_next_indicator, section->version_number, section->crc);
section->complete = FALSE;
gst_buffer_unref (section->buffer);
return TRUE;
}
static gboolean
mpegts_packetizer_parse_descriptors (MpegTSPacketizer2 * packetizer,
guint8 ** buffer, guint8 * buffer_end, GValueArray * descriptors)
{
guint8 length;
guint8 *data;
GValue value = { 0 };
GString *desc;
data = *buffer;
while (data < buffer_end) {
data++; /* skip tag */
length = *data++;
if (data + length > buffer_end) {
GST_WARNING ("invalid descriptor length %d now at %d max %d", length,
(gint) (data - *buffer), (gint) (buffer_end - *buffer));
goto error;
}
/* include length */
desc = g_string_new_len ((gchar *) data - 2, length + 2);
data += length;
/* G_TYPE_GSTRING is a GBoxed type and is used so properly marshalled from python */
g_value_init (&value, G_TYPE_GSTRING);
g_value_take_boxed (&value, desc);
g_value_array_append (descriptors, &value);
g_value_unset (&value);
}
if (data != buffer_end) {
GST_WARNING ("descriptors size %d expected %d", (gint) (data - *buffer),
(gint) (buffer_end - *buffer));
goto error;
}
*buffer = data;
return TRUE;
error:
return FALSE;
}
GstStructure *
mpegts_packetizer_parse_pat (MpegTSPacketizer2 * packetizer,
MpegTSPacketizerSection * section)
{
GstStructure *pat_info = NULL;
guint8 *data, *end;
guint transport_stream_id;
guint8 tmp;
guint program_number;
guint pmt_pid;
GValue entries = { 0 };
GValue value = { 0 };
GstStructure *entry = NULL;
gchar *struct_name;
data = GST_BUFFER_DATA (section->buffer);
section->table_id = *data++;
section->section_length = GST_READ_UINT16_BE (data) & 0x0FFF;
data += 2;
transport_stream_id = GST_READ_UINT16_BE (data);
data += 2;
tmp = *data++;
section->version_number = (tmp >> 1) & 0x1F;
section->current_next_indicator = tmp & 0x01;
/* skip section_number and last_section_number */
data += 2;
pat_info = gst_structure_id_new (QUARK_PAT,
QUARK_TRANSPORT_STREAM_ID, G_TYPE_UINT, transport_stream_id, NULL);
g_value_init (&entries, GST_TYPE_LIST);
/* stop at the CRC */
end = GST_BUFFER_DATA (section->buffer) + GST_BUFFER_SIZE (section->buffer);
while (data < end - 4) {
program_number = GST_READ_UINT16_BE (data);
data += 2;
pmt_pid = GST_READ_UINT16_BE (data) & 0x1FFF;
data += 2;
struct_name = g_strdup_printf ("program-%d", program_number);
entry = gst_structure_new (struct_name, NULL);
g_free (struct_name);
gst_structure_id_set (entry, QUARK_PROGRAM_NUMBER, G_TYPE_UINT,
program_number, QUARK_PID, G_TYPE_UINT, pmt_pid, NULL);
g_value_init (&value, GST_TYPE_STRUCTURE);
g_value_take_boxed (&value, entry);
gst_value_list_append_value (&entries, &value);
g_value_unset (&value);
}
gst_structure_id_set_value (pat_info, QUARK_PROGRAMS, &entries);
g_value_unset (&entries);
if (data != end - 4) {
/* FIXME: check the CRC before parsing the packet */
GST_ERROR ("at the end of PAT data != end - 4");
gst_structure_free (pat_info);
return NULL;
}
return pat_info;
}
GstStructure *
mpegts_packetizer_parse_pmt (MpegTSPacketizer2 * packetizer,
MpegTSPacketizerSection * section)
{
GstStructure *pmt = NULL;
guint8 *data, *end;
guint16 program_number;
guint8 tmp;
guint pcr_pid;
guint program_info_length;
guint8 stream_type;
guint16 pid;
guint stream_info_length;
GValueArray *descriptors;
GValue stream_value = { 0 };
GValue programs = { 0 };
GstStructure *stream_info = NULL;
gchar *struct_name;
/* fixed header + CRC == 16 */
if (GST_BUFFER_SIZE (section->buffer) < 16) {
GST_WARNING ("PID %d invalid PMT size %d",
section->pid, section->section_length);
goto error;
}
data = GST_BUFFER_DATA (section->buffer);
end = data + GST_BUFFER_SIZE (section->buffer);
section->table_id = *data++;
section->section_length = GST_READ_UINT16_BE (data) & 0x0FFF;
data += 2;
program_number = GST_READ_UINT16_BE (data);
data += 2;
GST_DEBUG ("Parsing %d Program Map Table", program_number);
tmp = *data++;
section->version_number = (tmp >> 1) & 0x1F;
section->current_next_indicator = tmp & 0x01;
/* skip section_number and last_section_number */
data += 2;
pcr_pid = GST_READ_UINT16_BE (data) & 0x1FFF;
data += 2;
program_info_length = GST_READ_UINT16_BE (data) & 0x0FFF;
data += 2;
pmt = gst_structure_id_new (QUARK_PMT,
QUARK_PROGRAM_NUMBER, G_TYPE_UINT, program_number,
QUARK_PCR_PID, G_TYPE_UINT, pcr_pid,
QUARK_VERSION_NUMBER, G_TYPE_UINT, section->version_number, NULL);
if (program_info_length) {
/* check that the buffer is large enough to contain at least
* program_info_length bytes + CRC */
if (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;
}
descriptors = g_value_array_new (0);
if (!mpegts_packetizer_parse_descriptors (packetizer,
&data, data + program_info_length, descriptors)) {
g_value_array_free (descriptors);
goto error;
}
gst_structure_id_set (pmt, QUARK_DESCRIPTORS, G_TYPE_VALUE_ARRAY,
descriptors, NULL);
g_value_array_free (descriptors);
}
g_value_init (&programs, GST_TYPE_LIST);
/* parse entries, cycle until there's space for another entry (at least 5
* bytes) plus the CRC */
while (data <= end - 4 - 5) {
stream_type = *data++;
GST_DEBUG ("Stream type 0x%02x found", stream_type);
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));
g_value_unset (&programs);
goto error;
}
struct_name = g_strdup_printf ("pid-%d", pid);
stream_info = gst_structure_new (struct_name, NULL);
g_free (struct_name);
gst_structure_id_set (stream_info,
QUARK_PID, G_TYPE_UINT, pid, QUARK_STREAM_TYPE, G_TYPE_UINT,
stream_type, NULL);
if (stream_info_length) {
/* check for AC3 descriptor */
GstMPEGDescriptor *desc =
gst_mpeg_descriptor_parse (data, stream_info_length);
if (desc != NULL) {
/* DVB AC3 */
guint8 *desc_data;
if (gst_mpeg_descriptor_find (desc, DESC_DVB_AC3)) {
gst_structure_set (stream_info, "has-ac3", G_TYPE_BOOLEAN, TRUE,
NULL);
}
/* DATA BROADCAST ID */
desc_data = gst_mpeg_descriptor_find (desc, DESC_DVB_DATA_BROADCAST_ID);
if (desc_data) {
guint16 data_broadcast_id;
data_broadcast_id =
DESC_DVB_DATA_BROADCAST_ID_data_broadcast_id (desc_data);
gst_structure_set (stream_info, "data-broadcast-id", G_TYPE_UINT,
data_broadcast_id, NULL);
}
/* DATA BROADCAST */
desc_data = gst_mpeg_descriptor_find (desc, DESC_DVB_DATA_BROADCAST);
if (desc_data) {
GstStructure *databroadcast_info;
guint16 data_broadcast_id;
guint8 component_tag;
data_broadcast_id =
DESC_DVB_DATA_BROADCAST_data_broadcast_id (desc_data);
component_tag = DESC_DVB_DATA_BROADCAST_component_tag (desc_data);
databroadcast_info = gst_structure_new ("data-broadcast", "id",
G_TYPE_UINT, data_broadcast_id, "component-tag", component_tag,
NULL);
gst_structure_set (stream_info, "data-broadcast", GST_TYPE_STRUCTURE,
databroadcast_info, NULL);
}
/* DVB CAROUSEL IDENTIFIER */
desc_data =
gst_mpeg_descriptor_find (desc, DESC_DVB_CAROUSEL_IDENTIFIER);
if (desc_data) {
guint32 carousel_id;
carousel_id = DESC_DVB_CAROUSEL_IDENTIFIER_carousel_id (desc_data);
gst_structure_set (stream_info, "carousel-id", G_TYPE_UINT,
carousel_id, NULL);
}
/* DVB STREAM IDENTIFIER */
desc_data = gst_mpeg_descriptor_find (desc, DESC_DVB_STREAM_IDENTIFIER);
if (desc_data) {
guint8 component_tag;
component_tag = DESC_DVB_STREAM_IDENTIFIER_component_tag (desc_data);
gst_structure_set (stream_info, "component-tag", G_TYPE_UINT,
component_tag, NULL);
}
/* ISO 639 LANGUAGE */
desc_data = gst_mpeg_descriptor_find (desc, DESC_ISO_639_LANGUAGE);
if (desc_data && DESC_ISO_639_LANGUAGE_codes_n (desc_data)) {
gchar *lang_code;
gchar *language_n = (gchar *)
DESC_ISO_639_LANGUAGE_language_code_nth (desc_data, 0);
lang_code = g_strndup (language_n, 3);
gst_structure_set (stream_info, "lang-code", G_TYPE_STRING,
lang_code, NULL);
g_free (lang_code);
}
gst_mpeg_descriptor_free (desc);
}
descriptors = g_value_array_new (0);
if (!mpegts_packetizer_parse_descriptors (packetizer,
&data, data + stream_info_length, descriptors)) {
g_value_unset (&programs);
gst_structure_free (stream_info);
g_value_array_free (descriptors);
goto error;
}
gst_structure_id_set (stream_info,
QUARK_DESCRIPTORS, G_TYPE_VALUE_ARRAY, descriptors, NULL);
g_value_array_free (descriptors);
}
g_value_init (&stream_value, GST_TYPE_STRUCTURE);
g_value_take_boxed (&stream_value, stream_info);
gst_value_list_append_value (&programs, &stream_value);
g_value_unset (&stream_value);
}
gst_structure_id_set_value (pmt, QUARK_STREAMS, &programs);
g_value_unset (&programs);
g_assert (data == end - 4);
return pmt;
error:
if (pmt)
gst_structure_free (pmt);
return NULL;
}
GstStructure *
mpegts_packetizer_parse_nit (MpegTSPacketizer2 * packetizer,
MpegTSPacketizerSection * section)
{
GstStructure *nit = NULL, *transport = NULL, *delivery_structure = NULL;
guint8 *data, *end, *entry_begin;
guint16 network_id, transport_stream_id, original_network_id;
guint tmp;
guint16 descriptors_loop_length, transport_stream_loop_length;
GValue transports = { 0 };
GValue transport_value = { 0 };
GValueArray *descriptors = NULL;
GST_DEBUG ("NIT");
/* fixed header + CRC == 16 */
if (GST_BUFFER_SIZE (section->buffer) < 23) {
GST_WARNING ("PID %d invalid NIT size %d",
section->pid, section->section_length);
goto error;
}
data = GST_BUFFER_DATA (section->buffer);
end = data + GST_BUFFER_SIZE (section->buffer);
section->table_id = *data++;
section->section_length = GST_READ_UINT16_BE (data) & 0x0FFF;
data += 2;
if (data + section->section_length != end) {
GST_WARNING ("PID %d invalid NIT section length %d expected %d",
section->pid, section->section_length, (gint) (end - data));
goto error;
}
network_id = GST_READ_UINT16_BE (data);
data += 2;
tmp = *data++;
section->version_number = (tmp >> 1) & 0x1F;
section->current_next_indicator = tmp & 0x01;
/* skip section_number and last_section_number */
data += 2;
descriptors_loop_length = GST_READ_UINT16_BE (data) & 0x0FFF;
data += 2;
nit = gst_structure_id_new (QUARK_NIT,
QUARK_NETWORK_ID, G_TYPE_UINT, network_id,
QUARK_VERSION_NUMBER, G_TYPE_UINT, section->version_number,
QUARK_CURRENT_NEXT_INDICATOR, G_TYPE_UINT,
section->current_next_indicator, QUARK_ACTUAL_NETWORK, G_TYPE_BOOLEAN,
section->table_id == 0x40, NULL);
/* see if the buffer is large enough */
if (descriptors_loop_length) {
guint8 *networkname_descriptor;
GstMPEGDescriptor *mpegdescriptor;
if (data + descriptors_loop_length > end - 4) {
GST_WARNING ("PID %d invalid NIT descriptors loop length %d",
section->pid, descriptors_loop_length);
gst_structure_free (nit);
goto error;
}
mpegdescriptor = gst_mpeg_descriptor_parse (data, descriptors_loop_length);
networkname_descriptor =
gst_mpeg_descriptor_find (mpegdescriptor, DESC_DVB_NETWORK_NAME);
if (networkname_descriptor != NULL) {
gchar *networkname_tmp;
/* No need to bounds check this value as it comes from the descriptor length itself */
guint8 networkname_length =
DESC_DVB_NETWORK_NAME_length (networkname_descriptor);
gchar *networkname =
(gchar *) DESC_DVB_NETWORK_NAME_text (networkname_descriptor);
networkname_tmp =
get_encoding_and_convert (networkname, networkname_length);
gst_structure_id_set (nit, QUARK_NETWORK_NAME, G_TYPE_STRING,
networkname_tmp, NULL);
g_free (networkname_tmp);
}
gst_mpeg_descriptor_free (mpegdescriptor);
descriptors = g_value_array_new (0);
if (!mpegts_packetizer_parse_descriptors (packetizer,
&data, data + descriptors_loop_length, descriptors)) {
gst_structure_free (nit);
g_value_array_free (descriptors);
goto error;
}
gst_structure_id_set (nit, QUARK_DESCRIPTORS, G_TYPE_VALUE_ARRAY,
descriptors, NULL);
g_value_array_free (descriptors);
}
transport_stream_loop_length = GST_READ_UINT16_BE (data) & 0x0FFF;
data += 2;
g_value_init (&transports, GST_TYPE_LIST);
/* read up to the CRC */
while (transport_stream_loop_length - 4 > 0) {
gchar *transport_name;
entry_begin = data;
if (transport_stream_loop_length < 10) {
/* each entry must be at least 6 bytes (+ 4bytes CRC) */
GST_WARNING ("PID %d invalid NIT entry size %d",
section->pid, transport_stream_loop_length);
goto error;
}
transport_stream_id = GST_READ_UINT16_BE (data);
data += 2;
original_network_id = GST_READ_UINT16_BE (data);
data += 2;
descriptors_loop_length = GST_READ_UINT16_BE (data) & 0x0FFF;
data += 2;
transport_name = g_strdup_printf ("transport-%d", transport_stream_id);
transport = gst_structure_new (transport_name, NULL);
g_free (transport_name);
gst_structure_id_set (transport,
QUARK_TRANSPORT_STREAM_ID, G_TYPE_UINT, transport_stream_id,
QUARK_ORIGINAL_NETWORK_ID, G_TYPE_UINT, original_network_id, NULL);
if (descriptors_loop_length) {
GstMPEGDescriptor *mpegdescriptor;
guint8 *delivery;
if (data + descriptors_loop_length > end - 4) {
GST_WARNING ("PID %d invalid NIT entry %d descriptors loop length %d",
section->pid, transport_stream_id, descriptors_loop_length);
gst_structure_free (transport);
goto error;
}
mpegdescriptor =
gst_mpeg_descriptor_parse (data, descriptors_loop_length);
if ((delivery =
gst_mpeg_descriptor_find (mpegdescriptor,
DESC_DVB_SATELLITE_DELIVERY_SYSTEM))) {
guint8 *frequency_bcd =
DESC_DVB_SATELLITE_DELIVERY_SYSTEM_frequency (delivery);
guint32 frequency =
10 * ((frequency_bcd[3] & 0x0F) +
10 * ((frequency_bcd[3] & 0xF0) >> 4) +
100 * (frequency_bcd[2] & 0x0F) +
1000 * ((frequency_bcd[2] & 0xF0) >> 4) +
10000 * (frequency_bcd[1] & 0x0F) +
100000 * ((frequency_bcd[1] & 0xF0) >> 4) +
1000000 * (frequency_bcd[0] & 0x0F) +
10000000 * ((frequency_bcd[0] & 0xF0) >> 4));
guint8 *orbital_bcd =
DESC_DVB_SATELLITE_DELIVERY_SYSTEM_orbital_position (delivery);
gfloat orbital =
(orbital_bcd[1] & 0x0F) / 10. + ((orbital_bcd[1] & 0xF0) >> 4) +
10 * (orbital_bcd[0] & 0x0F) + 100 * ((orbital_bcd[0] & 0xF0) >> 4);
gboolean east =
DESC_DVB_SATELLITE_DELIVERY_SYSTEM_west_east_flag (delivery);
guint8 polarization =
DESC_DVB_SATELLITE_DELIVERY_SYSTEM_polarization (delivery);
const gchar *polarization_str;
guint8 modulation =
DESC_DVB_SATELLITE_DELIVERY_SYSTEM_modulation (delivery);
const gchar *modulation_str;
guint8 *symbol_rate_bcd =
DESC_DVB_SATELLITE_DELIVERY_SYSTEM_symbol_rate (delivery);
guint32 symbol_rate =
(symbol_rate_bcd[2] & 0x0F) +
10 * ((symbol_rate_bcd[2] & 0xF0) >> 4) +
100 * (symbol_rate_bcd[1] & 0x0F) +
1000 * ((symbol_rate_bcd[1] & 0xF0) >> 4) +
10000 * (symbol_rate_bcd[0] & 0x0F) +
100000 * ((symbol_rate_bcd[0] & 0xF0) >> 4);
guint8 fec_inner =
DESC_DVB_SATELLITE_DELIVERY_SYSTEM_fec_inner (delivery);
const gchar *fec_inner_str;
switch (polarization) {
case 0:
polarization_str = "horizontal";
break;
case 1:
polarization_str = "vertical";
break;
case 2:
polarization_str = "left";
break;
case 3:
polarization_str = "right";
break;
default:
polarization_str = "";
}
switch (fec_inner) {
case 0:
fec_inner_str = "undefined";
break;
case 1:
fec_inner_str = "1/2";
break;
case 2:
fec_inner_str = "2/3";
break;
case 3:
fec_inner_str = "3/4";
break;
case 4:
fec_inner_str = "5/6";
break;
case 5:
fec_inner_str = "7/8";
break;
case 6:
fec_inner_str = "8/9";
break;
case 0xF:
fec_inner_str = "none";
break;
default:
fec_inner_str = "reserved";
}
switch (modulation) {
case 0x00:
modulation_str = "undefined";
break;
case 0x01:
modulation_str = "QAM16";
break;
case 0x02:
modulation_str = "QAM32";
break;
case 0x03:
modulation_str = "QAM64";
break;
case 0x04:
modulation_str = "QAM128";
break;
case 0x05:
modulation_str = "QAM256";
break;
default:
modulation_str = "reserved";
}
delivery_structure = gst_structure_new ("satellite",
"orbital", G_TYPE_FLOAT, orbital,
"east-or-west", G_TYPE_STRING, east ? "east" : "west",
"modulation", G_TYPE_STRING, modulation_str,
"frequency", G_TYPE_UINT, frequency,
"polarization", G_TYPE_STRING, polarization_str,
"symbol-rate", G_TYPE_UINT, symbol_rate,
"inner-fec", G_TYPE_STRING, fec_inner_str, NULL);
gst_structure_set (transport, "delivery", GST_TYPE_STRUCTURE,
delivery_structure, NULL);
} else if ((delivery =
gst_mpeg_descriptor_find (mpegdescriptor,
DESC_DVB_TERRESTRIAL_DELIVERY_SYSTEM))) {
guint32 frequency =
DESC_DVB_TERRESTRIAL_DELIVERY_SYSTEM_frequency (delivery) * 10;
guint8 bandwidth =
DESC_DVB_TERRESTRIAL_DELIVERY_SYSTEM_bandwidth (delivery);
guint8 constellation =
DESC_DVB_TERRESTRIAL_DELIVERY_SYSTEM_constellation (delivery);
guint8 hierarchy =
DESC_DVB_TERRESTRIAL_DELIVERY_SYSTEM_hierarchy (delivery);
guint8 code_rate_hp =
DESC_DVB_TERRESTRIAL_DELIVERY_SYSTEM_code_rate_hp (delivery);
guint8 code_rate_lp =
DESC_DVB_TERRESTRIAL_DELIVERY_SYSTEM_code_rate_lp (delivery);
guint8 guard_interval =
DESC_DVB_TERRESTRIAL_DELIVERY_SYSTEM_guard_interval (delivery);
guint8 transmission_mode =
DESC_DVB_TERRESTRIAL_DELIVERY_SYSTEM_transmission_mode (delivery);
gboolean other_frequency =
DESC_DVB_TERRESTRIAL_DELIVERY_SYSTEM_other_frequency (delivery);
const gchar *constellation_str, *code_rate_hp_str, *code_rate_lp_str,
*transmission_mode_str;
/* do the stuff */
/* bandwidth is 8 if 0, 7 if 1, 6 if 2, reserved otherwise */
if (bandwidth <= 2)
bandwidth = 8 - bandwidth;
else
bandwidth = 0;
switch (constellation) {
case 0:
constellation_str = "QPSK";
break;
case 1:
constellation_str = "QAM16";
break;
case 2:
constellation_str = "QAM64";
break;
default:
constellation_str = "reserved";
}
/* hierarchy is 4 if 3, 2 if 2, 1 if 1, 0 if 0, reserved if > 3 */
if (hierarchy <= 3) {
if (hierarchy == 3)
hierarchy = 4;
} else {
hierarchy = 0;
}
switch (code_rate_hp) {
case 0:
code_rate_hp_str = "1/2";
break;
case 1:
code_rate_hp_str = "2/3";
break;
case 2:
code_rate_hp_str = "3/4";
break;
case 3:
code_rate_hp_str = "5/6";
break;
case 4:
code_rate_hp_str = "7/8";
break;
default:
code_rate_hp_str = "reserved";
}
switch (code_rate_lp) {
case 0:
code_rate_lp_str = "1/2";
break;
case 1:
code_rate_lp_str = "2/3";
break;
case 2:
code_rate_lp_str = "3/4";
break;
case 3:
code_rate_lp_str = "5/6";
break;
case 4:
code_rate_lp_str = "7/8";
break;
default:
code_rate_lp_str = "reserved";
}
/* guard is 32 if 0, 16 if 1, 8 if 2, 4 if 3 */
switch (guard_interval) {
case 0:
guard_interval = 32;
break;
case 1:
guard_interval = 16;
break;
case 2:
guard_interval = 8;
break;
case 3:
guard_interval = 4;
break;
default: /* make it default to 32 */
guard_interval = 32;
}
switch (transmission_mode) {
case 0:
transmission_mode_str = "2k";
break;
case 1:
transmission_mode_str = "8k";
break;
default:
transmission_mode_str = "reserved";
}
delivery_structure = gst_structure_new ("terrestrial",
"frequency", G_TYPE_UINT, frequency,
"bandwidth", G_TYPE_UINT, bandwidth,
"constellation", G_TYPE_STRING, constellation_str,
"hierarchy", G_TYPE_UINT, hierarchy,
"code-rate-hp", G_TYPE_STRING, code_rate_hp_str,
"code-rate-lp", G_TYPE_STRING, code_rate_lp_str,
"guard-interval", G_TYPE_UINT, guard_interval,
"transmission-mode", G_TYPE_STRING, transmission_mode_str,
"other-frequency", G_TYPE_BOOLEAN, other_frequency, NULL);
gst_structure_set (transport, "delivery", GST_TYPE_STRUCTURE,
delivery_structure, NULL);
} else if ((delivery =
gst_mpeg_descriptor_find (mpegdescriptor,
DESC_DVB_CABLE_DELIVERY_SYSTEM))) {
guint8 *frequency_bcd =
DESC_DVB_CABLE_DELIVERY_SYSTEM_frequency (delivery);
/* see en 300 468 section 6.2.13.1 least significant bcd digit
* is measured in 100Hz units so multiplier needs to be 100 to get
* into Hz */
guint32 frequency = 100 *
((frequency_bcd[3] & 0x0F) +
10 * ((frequency_bcd[3] & 0xF0) >> 4) +
100 * (frequency_bcd[2] & 0x0F) +
1000 * ((frequency_bcd[2] & 0xF0) >> 4) +
10000 * (frequency_bcd[1] & 0x0F) +
100000 * ((frequency_bcd[1] & 0xF0) >> 4) +
1000000 * (frequency_bcd[0] & 0x0F) +
10000000 * ((frequency_bcd[0] & 0xF0) >> 4));
guint8 modulation =
DESC_DVB_CABLE_DELIVERY_SYSTEM_modulation (delivery);
const gchar *modulation_str;
guint8 *symbol_rate_bcd =
DESC_DVB_CABLE_DELIVERY_SYSTEM_symbol_rate (delivery);
guint32 symbol_rate =
(symbol_rate_bcd[2] & 0x0F) +
10 * ((symbol_rate_bcd[2] & 0xF0) >> 4) +
100 * (symbol_rate_bcd[1] & 0x0F) +
1000 * ((symbol_rate_bcd[1] & 0xF0) >> 4) +
10000 * (symbol_rate_bcd[0] & 0x0F) +
100000 * ((symbol_rate_bcd[0] & 0xF0) >> 4);
guint8 fec_inner = DESC_DVB_CABLE_DELIVERY_SYSTEM_fec_inner (delivery);
const gchar *fec_inner_str;
switch (fec_inner) {
case 0:
fec_inner_str = "undefined";
break;
case 1:
fec_inner_str = "1/2";
break;
case 2:
fec_inner_str = "2/3";
break;
case 3:
fec_inner_str = "3/4";
break;
case 4:
fec_inner_str = "5/6";
break;
case 5:
fec_inner_str = "7/8";
break;
case 6:
fec_inner_str = "8/9";
break;
case 0xF:
fec_inner_str = "none";
break;
default:
fec_inner_str = "reserved";
}
switch (modulation) {
case 0x00:
modulation_str = "undefined";
break;
case 0x01:
modulation_str = "QAM16";
break;
case 0x02:
modulation_str = "QAM32";
break;
case 0x03:
modulation_str = "QAM64";
break;
case 0x04:
modulation_str = "QAM128";
break;
case 0x05:
modulation_str = "QAM256";
break;
default:
modulation_str = "reserved";
}
delivery_structure = gst_structure_new ("cable",
"modulation", G_TYPE_STRING, modulation_str,
"frequency", G_TYPE_UINT, frequency,
"symbol-rate", G_TYPE_UINT, symbol_rate,
"inner-fec", G_TYPE_STRING, fec_inner_str, NULL);
gst_structure_set (transport, "delivery", GST_TYPE_STRUCTURE,
delivery_structure, NULL);
}
/* free the temporary delivery structure */
if (delivery_structure != NULL) {
gst_structure_free (delivery_structure);
delivery_structure = NULL;
}
if ((delivery =
gst_mpeg_descriptor_find (mpegdescriptor,
DESC_DTG_LOGICAL_CHANNEL))) {
guint8 *current_pos = delivery + 2;
GValue channel_numbers = { 0 };
g_value_init (&channel_numbers, GST_TYPE_LIST);
while (current_pos < delivery + DESC_LENGTH (delivery)) {
GstStructure *channel;
GValue channel_value = { 0 };
guint16 service_id = GST_READ_UINT16_BE (current_pos);
guint16 logical_channel_number;
current_pos += 2;
logical_channel_number = GST_READ_UINT16_BE (current_pos) & 0x03ff;
channel =
gst_structure_new ("channels", "service-id", G_TYPE_UINT,
service_id, "logical-channel-number", G_TYPE_UINT,
logical_channel_number, NULL);
g_value_init (&channel_value, GST_TYPE_STRUCTURE);
g_value_take_boxed (&channel_value, channel);
gst_value_list_append_value (&channel_numbers, &channel_value);
g_value_unset (&channel_value);
current_pos += 2;
}
gst_structure_set_value (transport, "channels", &channel_numbers);
g_value_unset (&channel_numbers);
}
if ((delivery =
gst_mpeg_descriptor_find (mpegdescriptor,
DESC_DVB_FREQUENCY_LIST))) {
guint8 *current_pos = delivery + 2;
GValue frequencies = { 0 };
guint8 type;
type = *current_pos & 0x03;
current_pos++;
if (type) {
const gchar *fieldname = NULL;
g_value_init (&frequencies, GST_TYPE_LIST);
while (current_pos < delivery + DESC_LENGTH (delivery) - 3) {
guint32 freq = 0;
guint8 *frequency_bcd = current_pos;
GValue frequency = { 0 };
switch (type) {
case 0x01:
/* satellite */
freq =
10 * ((frequency_bcd[3] & 0x0F) +
10 * ((frequency_bcd[3] & 0xF0) >> 4) +
100 * (frequency_bcd[2] & 0x0F) +
1000 * ((frequency_bcd[2] & 0xF0) >> 4) +
10000 * (frequency_bcd[1] & 0x0F) +
100000 * ((frequency_bcd[1] & 0xF0) >> 4) +
1000000 * (frequency_bcd[0] & 0x0F) +
10000000 * ((frequency_bcd[0] & 0xF0) >> 4));
break;
case 0x02:
/* cable */
freq = 100 *
((frequency_bcd[3] & 0x0F) +
10 * ((frequency_bcd[3] & 0xF0) >> 4) +
100 * (frequency_bcd[2] & 0x0F) +
1000 * ((frequency_bcd[2] & 0xF0) >> 4) +
10000 * (frequency_bcd[1] & 0x0F) +
100000 * ((frequency_bcd[1] & 0xF0) >> 4) +
1000000 * (frequency_bcd[0] & 0x0F) +
10000000 * ((frequency_bcd[0] & 0xF0) >> 4));
break;
case 0x03:
/* terrestrial */
freq = GST_READ_UINT32_BE (current_pos) * 10;
break;
}
g_value_init (&frequency, G_TYPE_UINT);
g_value_set_uint (&frequency, freq);
gst_value_list_append_value (&frequencies, &frequency);
g_value_unset (&frequency);
current_pos += 4;
}
switch (type) {
case 0x01:
fieldname = "frequency-list-satellite";
break;
case 0x02:
fieldname = "frequency-list-cable";
break;
case 0x03:
fieldname = "frequency-list-terrestrial";
break;
}
gst_structure_set_value (transport, fieldname, &frequencies);
g_value_unset (&frequencies);
}
}
gst_mpeg_descriptor_free (mpegdescriptor);
descriptors = g_value_array_new (0);
if (!mpegts_packetizer_parse_descriptors (packetizer,
&data, data + descriptors_loop_length, descriptors)) {
gst_structure_free (transport);
g_value_array_free (descriptors);
goto error;
}
gst_structure_id_set (transport, QUARK_DESCRIPTORS, G_TYPE_VALUE_ARRAY,
descriptors, NULL);
g_value_array_free (descriptors);
}
g_value_init (&transport_value, GST_TYPE_STRUCTURE);
g_value_take_boxed (&transport_value, transport);
gst_value_list_append_value (&transports, &transport_value);
g_value_unset (&transport_value);
transport_stream_loop_length -= data - entry_begin;
}
if (data != end - 4) {
GST_WARNING ("PID %d invalid NIT parsed %d length %d",
section->pid, (gint) (data - GST_BUFFER_DATA (section->buffer)),
GST_BUFFER_SIZE (section->buffer));
goto error;
}
gst_structure_id_set_value (nit, QUARK_TRANSPORTS, &transports);
g_value_unset (&transports);
GST_DEBUG ("NIT %" GST_PTR_FORMAT, nit);
return nit;
error:
if (nit)
gst_structure_free (nit);
if (GST_VALUE_HOLDS_LIST (&transports))
g_value_unset (&transports);
return NULL;
}
GstStructure *
mpegts_packetizer_parse_sdt (MpegTSPacketizer2 * packetizer,
MpegTSPacketizerSection * section)
{
GstStructure *sdt = NULL, *service = NULL;
guint8 *data, *end, *entry_begin;
guint16 transport_stream_id, original_network_id, service_id;
guint tmp;
guint sdt_info_length;
guint8 running_status;
gboolean scrambled;
guint descriptors_loop_length;
GValue services = { 0 };
GValueArray *descriptors = NULL;
GValue service_value = { 0 };
GST_DEBUG ("SDT");
/* fixed header + CRC == 16 */
if (GST_BUFFER_SIZE (section->buffer) < 14) {
GST_WARNING ("PID %d invalid SDT size %d",
section->pid, section->section_length);
goto error;
}
data = GST_BUFFER_DATA (section->buffer);
end = data + GST_BUFFER_SIZE (section->buffer);
section->table_id = *data++;
section->section_length = GST_READ_UINT16_BE (data) & 0x0FFF;
data += 2;
if (data + section->section_length != end) {
GST_WARNING ("PID %d invalid SDT section length %d expected %d",
section->pid, section->section_length, (gint) (end - data));
goto error;
}
transport_stream_id = GST_READ_UINT16_BE (data);
data += 2;
tmp = *data++;
section->version_number = (tmp >> 1) & 0x1F;
section->current_next_indicator = tmp & 0x01;
/* skip section_number and last_section_number */
data += 2;
original_network_id = GST_READ_UINT16_BE (data);
data += 2;
/* skip reserved byte */
data += 1;
sdt = gst_structure_id_new (QUARK_SDT,
QUARK_TRANSPORT_STREAM_ID, G_TYPE_UINT, transport_stream_id,
QUARK_VERSION_NUMBER, G_TYPE_UINT, section->version_number,
QUARK_CURRENT_NEXT_INDICATOR, G_TYPE_UINT,
section->current_next_indicator, QUARK_ORIGINAL_NETWORK_ID, G_TYPE_UINT,
original_network_id, QUARK_ACTUAL_TRANSPORT_STREAM, G_TYPE_BOOLEAN,
section->table_id == 0x42, NULL);
sdt_info_length = section->section_length - 8;
g_value_init (&services, GST_TYPE_LIST);
/* read up to the CRC */
while (sdt_info_length - 4 > 0) {
gchar *service_name;
entry_begin = data;
if (sdt_info_length < 9) {
/* each entry must be at least 5 bytes (+4 bytes for the CRC) */
GST_WARNING ("PID %d invalid SDT entry size %d",
section->pid, sdt_info_length);
goto error;
}
service_id = GST_READ_UINT16_BE (data);
data += 2;
/* EIT_schedule = ((*data & 0x02) == 2); */
/* EIT_present_following = (*data & 0x01) == 1; */
data += 1;
tmp = GST_READ_UINT16_BE (data);
running_status = (*data >> 5) & 0x07;
scrambled = (*data >> 4) & 0x01;
descriptors_loop_length = tmp & 0x0FFF;
data += 2;
/* TODO send tag event down relevant pad for channel name and provider */
service_name = g_strdup_printf ("service-%d", service_id);
service = gst_structure_new (service_name, NULL);
g_free (service_name);
if (descriptors_loop_length) {
guint8 *service_descriptor;
GstMPEGDescriptor *mpegdescriptor;
if (data + descriptors_loop_length > end - 4) {
GST_WARNING ("PID %d invalid SDT entry %d descriptors loop length %d",
section->pid, service_id, descriptors_loop_length);
gst_structure_free (service);
goto error;
}
mpegdescriptor =
gst_mpeg_descriptor_parse (data, descriptors_loop_length);
service_descriptor =
gst_mpeg_descriptor_find (mpegdescriptor, DESC_DVB_SERVICE);
if (service_descriptor != NULL) {
gchar *servicename_tmp, *serviceprovider_name_tmp;
guint8 serviceprovider_name_length =
DESC_DVB_SERVICE_provider_name_length (service_descriptor);
gchar *serviceprovider_name =
(gchar *) DESC_DVB_SERVICE_provider_name_text (service_descriptor);
guint8 servicename_length =
DESC_DVB_SERVICE_name_length (service_descriptor);
gchar *servicename =
(gchar *) DESC_DVB_SERVICE_name_text (service_descriptor);
if (servicename_length + serviceprovider_name_length + 2 <=
DESC_LENGTH (service_descriptor)) {
const gchar *running_status_tmp;
switch (running_status) {
case 0:
running_status_tmp = "undefined";
break;
case 1:
running_status_tmp = "not running";
break;
case 2:
running_status_tmp = "starts in a few seconds";
break;
case 3:
running_status_tmp = "pausing";
break;
case 4:
running_status_tmp = "running";
break;
default:
running_status_tmp = "reserved";
}
servicename_tmp =
get_encoding_and_convert (servicename, servicename_length);
serviceprovider_name_tmp =
get_encoding_and_convert (serviceprovider_name,
serviceprovider_name_length);
gst_structure_set (service,
"name", G_TYPE_STRING, servicename_tmp,
"provider-name", G_TYPE_STRING, serviceprovider_name_tmp,
"scrambled", G_TYPE_BOOLEAN, scrambled,
"running-status", G_TYPE_STRING, running_status_tmp, NULL);
g_free (servicename_tmp);
g_free (serviceprovider_name_tmp);
}
}
gst_mpeg_descriptor_free (mpegdescriptor);
descriptors = g_value_array_new (0);
if (!mpegts_packetizer_parse_descriptors (packetizer,
&data, data + descriptors_loop_length, descriptors)) {
gst_structure_free (service);
g_value_array_free (descriptors);
goto error;
}
gst_structure_id_set (service, QUARK_DESCRIPTORS, G_TYPE_VALUE_ARRAY,
descriptors, NULL);
g_value_array_free (descriptors);
}
g_value_init (&service_value, GST_TYPE_STRUCTURE);
g_value_take_boxed (&service_value, service);
gst_value_list_append_value (&services, &service_value);
g_value_unset (&service_value);
sdt_info_length -= data - entry_begin;
}
if (data != end - 4) {
GST_WARNING ("PID %d invalid SDT parsed %d length %d",
section->pid, (gint) (data - GST_BUFFER_DATA (section->buffer)),
GST_BUFFER_SIZE (section->buffer));
goto error;
}
gst_structure_id_set_value (sdt, QUARK_SERVICES, &services);
g_value_unset (&services);
return sdt;
error:
if (sdt)
gst_structure_free (sdt);
if (GST_VALUE_HOLDS_LIST (&services))
g_value_unset (&services);
return NULL;
}
GstStructure *
mpegts_packetizer_parse_eit (MpegTSPacketizer2 * packetizer,
MpegTSPacketizerSection * section)
{
GstStructure *eit = NULL, *event = NULL;
guint service_id, last_table_id, segment_last_section_number;
guint transport_stream_id, original_network_id;
gboolean free_ca_mode;
guint event_id, running_status;
guint16 mjd;
guint year, month, day, hour, minute, second;
guint duration;
guint8 *data, *end, *duration_ptr, *utc_ptr;
guint16 descriptors_loop_length;
GValue events = { 0 };
GValue event_value = { 0 };
GValueArray *descriptors = NULL;
gchar *event_name;
guint tmp;
/* fixed header + CRC == 16 */
if (GST_BUFFER_SIZE (section->buffer) < 18) {
GST_WARNING ("PID %d invalid EIT size %d",
section->pid, section->section_length);
goto error;
}
data = GST_BUFFER_DATA (section->buffer);
end = data + GST_BUFFER_SIZE (section->buffer);
section->table_id = *data++;
section->section_length = GST_READ_UINT16_BE (data) & 0x0FFF;
data += 2;
if (data + section->section_length != end) {
GST_WARNING ("PID %d invalid EIT section length %d expected %d",
section->pid, section->section_length, (gint) (end - data));
goto error;
}
service_id = GST_READ_UINT16_BE (data);
data += 2;
tmp = *data++;
section->version_number = (tmp >> 1) & 0x1F;
section->current_next_indicator = tmp & 0x01;
/* skip section_number and last_section_number */
data += 2;
transport_stream_id = GST_READ_UINT16_BE (data);
data += 2;
original_network_id = GST_READ_UINT16_BE (data);
data += 2;
segment_last_section_number = *data;
data += 1;
last_table_id = *data;
data += 1;
eit = gst_structure_id_new (QUARK_EIT,
QUARK_VERSION_NUMBER, G_TYPE_UINT, section->version_number,
QUARK_CURRENT_NEXT_INDICATOR, G_TYPE_UINT,
section->current_next_indicator, QUARK_SERVICE_ID, G_TYPE_UINT,
service_id, QUARK_ACTUAL_TRANSPORT_STREAM, G_TYPE_BOOLEAN,
(section->table_id == 0x4E || (section->table_id >= 0x50
&& section->table_id <= 0x5F)), QUARK_PRESENT_FOLLOWING,
G_TYPE_BOOLEAN, (section->table_id == 0x4E
|| section->table_id == 0x4F), QUARK_TRANSPORT_STREAM_ID, G_TYPE_UINT,
transport_stream_id, QUARK_ORIGINAL_NETWORK_ID, G_TYPE_UINT,
original_network_id, QUARK_SEGMENT_LAST_SECTION_NUMBER, G_TYPE_UINT,
segment_last_section_number, QUARK_LAST_TABLE_ID, G_TYPE_UINT,
last_table_id, NULL);
g_value_init (&events, GST_TYPE_LIST);
while (data < end - 4) {
/* 12 is the minimum entry size + CRC */
if (end - data < 12 + 4) {
GST_WARNING ("PID %d invalid EIT entry length %d",
section->pid, (gint) (end - 4 - data));
gst_structure_free (eit);
goto error;
}
event_id = GST_READ_UINT16_BE (data);
data += 2;
/* start_and_duration = GST_READ_UINT64_BE (data); */
duration_ptr = data + 5;
utc_ptr = data + 2;
mjd = GST_READ_UINT16_BE (data);
if (mjd == G_MAXUINT16) {
year = 1900;
month = day = hour = minute = second = 0;
} else {
/* See EN 300 468 Annex C */
year = (guint32) (((mjd - 15078.2) / 365.25));
month = (guint8) ((mjd - 14956.1 - (guint) (year * 365.25)) / 30.6001);
day = mjd - 14956 - (guint) (year * 365.25) - (guint) (month * 30.6001);
if (month == 14 || month == 15) {
year++;
month = month - 1 - 12;
} else {
month--;
}
year += 1900;
hour = ((utc_ptr[0] & 0xF0) >> 4) * 10 + (utc_ptr[0] & 0x0F);
minute = ((utc_ptr[1] & 0xF0) >> 4) * 10 + (utc_ptr[1] & 0x0F);
second = ((utc_ptr[2] & 0xF0) >> 4) * 10 + (utc_ptr[2] & 0x0F);
}
duration = (((duration_ptr[0] & 0xF0) >> 4) * 10 +
(duration_ptr[0] & 0x0F)) * 60 * 60 +
(((duration_ptr[1] & 0xF0) >> 4) * 10 +
(duration_ptr[1] & 0x0F)) * 60 +
((duration_ptr[2] & 0xF0) >> 4) * 10 + (duration_ptr[2] & 0x0F);
data += 8;
running_status = *data >> 5;
free_ca_mode = (*data >> 4) & 0x01;
descriptors_loop_length = GST_READ_UINT16_BE (data) & 0x0FFF;
data += 2;
/* TODO: send tag event down relevant pad saying what is currently playing */
event_name = g_strdup_printf ("event-%d", event_id);
event = gst_structure_new (event_name,
"event-id", G_TYPE_UINT, event_id,
"year", G_TYPE_UINT, year,
"month", G_TYPE_UINT, month,
"day", G_TYPE_UINT, day,
"hour", G_TYPE_UINT, hour,
"minute", G_TYPE_UINT, minute,
"second", G_TYPE_UINT, second,
"duration", G_TYPE_UINT, duration,
"running-status", G_TYPE_UINT, running_status,
"free-ca-mode", G_TYPE_BOOLEAN, free_ca_mode, NULL);
g_free (event_name);
if (descriptors_loop_length) {
guint8 *event_descriptor;
GArray *component_descriptors;
GArray *extended_event_descriptors;
GstMPEGDescriptor *mpegdescriptor;
if (data + descriptors_loop_length > end - 4) {
GST_WARNING ("PID %d invalid EIT descriptors loop length %d",
section->pid, descriptors_loop_length);
gst_structure_free (event);
goto error;
}
mpegdescriptor =
gst_mpeg_descriptor_parse (data, descriptors_loop_length);
event_descriptor =
gst_mpeg_descriptor_find (mpegdescriptor, DESC_DVB_SHORT_EVENT);
if (event_descriptor != NULL) {
gchar *eventname_tmp, *eventdescription_tmp;
guint8 eventname_length =
DESC_DVB_SHORT_EVENT_name_length (event_descriptor);
gchar *eventname =
(gchar *) DESC_DVB_SHORT_EVENT_name_text (event_descriptor);
guint8 eventdescription_length =
DESC_DVB_SHORT_EVENT_description_length (event_descriptor);
gchar *eventdescription =
(gchar *) DESC_DVB_SHORT_EVENT_description_text (event_descriptor);
if (eventname_length + eventdescription_length + 2 <=
DESC_LENGTH (event_descriptor)) {
eventname_tmp =
get_encoding_and_convert (eventname, eventname_length);
eventdescription_tmp =
get_encoding_and_convert (eventdescription,
eventdescription_length);
gst_structure_set (event, "name", G_TYPE_STRING, eventname_tmp, NULL);
gst_structure_set (event, "description", G_TYPE_STRING,
eventdescription_tmp, NULL);
g_free (eventname_tmp);
g_free (eventdescription_tmp);
}
}
extended_event_descriptors = gst_mpeg_descriptor_find_all (mpegdescriptor,
DESC_DVB_EXTENDED_EVENT);
if (extended_event_descriptors) {
int i;
guint8 *extended_descriptor;
/*GValue extended_items = { 0 }; */
gchar *extended_text = NULL;
/*g_value_init (&extended_items, GST_TYPE_LIST); */
for (i = 0; i < extended_event_descriptors->len; i++) {
extended_descriptor = g_array_index (extended_event_descriptors,
guint8 *, i);
if (DESC_DVB_EXTENDED_EVENT_descriptor_number (extended_descriptor) ==
i) {
if (extended_text) {
gchar *tmp;
gchar *old_extended_text = extended_text;
tmp = get_encoding_and_convert ((gchar *)
DESC_DVB_EXTENDED_EVENT_text (extended_descriptor),
DESC_DVB_EXTENDED_EVENT_text_length (extended_descriptor));
extended_text = g_strdup_printf ("%s%s", extended_text, tmp);
g_free (old_extended_text);
g_free (tmp);
} else {
extended_text = get_encoding_and_convert ((gchar *)
DESC_DVB_EXTENDED_EVENT_text (extended_descriptor),
DESC_DVB_EXTENDED_EVENT_text_length (extended_descriptor));
}
}
}
if (extended_text) {
gst_structure_set (event, "extended-text", G_TYPE_STRING,
extended_text, NULL);
g_free (extended_text);
}
g_array_free (extended_event_descriptors, TRUE);
}
component_descriptors = gst_mpeg_descriptor_find_all (mpegdescriptor,
DESC_DVB_COMPONENT);
if (component_descriptors) {
int i;
guint8 *comp_descriptor;
GValue components = { 0 };
g_value_init (&components, GST_TYPE_LIST);
/* FIXME: do the component descriptor parsing less verbosely
* and better...a task for 0.10.6 */
for (i = 0; i < component_descriptors->len; i++) {
GstStructure *component = NULL;
GValue component_value = { 0 };
gint widescreen = 0; /* 0 for 4:3, 1 for 16:9, 2 for > 16:9 */
gint freq = 25; /* 25 or 30 measured in Hertz */
/* gboolean highdef = FALSE; */
gboolean panvectors = FALSE;
const gchar *comptype = "";
comp_descriptor = g_array_index (component_descriptors, guint8 *, i);
switch (DESC_DVB_COMPONENT_stream_content (comp_descriptor)) {
case 0x01:
/* video */
switch (DESC_DVB_COMPONENT_type (comp_descriptor)) {
case 0x01:
widescreen = 0;
freq = 25;
break;
case 0x02:
widescreen = 1;
panvectors = TRUE;
freq = 25;
break;
case 0x03:
widescreen = 1;
panvectors = FALSE;
freq = 25;
break;
case 0x04:
widescreen = 2;
freq = 25;
break;
case 0x05:
widescreen = 0;
freq = 30;
break;
case 0x06:
widescreen = 1;
panvectors = TRUE;
freq = 30;
break;
case 0x07:
widescreen = 1;
panvectors = FALSE;
freq = 30;
break;
case 0x08:
widescreen = 2;
freq = 30;
break;
case 0x09:
widescreen = 0;
/* highdef = TRUE; */
freq = 25;
break;
case 0x0A:
widescreen = 1;
/* highdef = TRUE; */
panvectors = TRUE;
freq = 25;
break;
case 0x0B:
widescreen = 1;
/* highdef = TRUE; */
panvectors = FALSE;
freq = 25;
break;
case 0x0C:
widescreen = 2;
/* highdef = TRUE; */
freq = 25;
break;
case 0x0D:
widescreen = 0;
/* highdef = TRUE; */
freq = 30;
break;
case 0x0E:
widescreen = 1;
/* highdef = TRUE; */
panvectors = TRUE;
freq = 30;
break;
case 0x0F:
widescreen = 1;
/* highdef = TRUE; */
panvectors = FALSE;
freq = 30;
break;
case 0x10:
widescreen = 2;
/* highdef = TRUE; */
freq = 30;
break;
}
component = gst_structure_new ("video", "high-definition",
G_TYPE_BOOLEAN, TRUE, "frequency", G_TYPE_INT, freq,
"tag", G_TYPE_INT, DESC_DVB_COMPONENT_tag (comp_descriptor),
NULL);
if (widescreen == 0) {
gst_structure_set (component, "aspect-ratio",
G_TYPE_STRING, "4:3", NULL);
} else if (widescreen == 2) {
gst_structure_set (component, "aspect-ratio", G_TYPE_STRING,
"> 16:9", NULL);
} else {
gst_structure_set (component, "aspect-ratio", G_TYPE_STRING,
"16:9", "pan-vectors", G_TYPE_BOOLEAN, panvectors, NULL);
}
break;
case 0x02: /* audio */
comptype = "undefined";
switch (DESC_DVB_COMPONENT_type (comp_descriptor)) {
case 0x01:
comptype = "single channel mono";
break;
case 0x02:
comptype = "dual channel mono";
break;
case 0x03:
comptype = "stereo";
break;
case 0x04:
comptype = "multi-channel multi-lingual";
break;
case 0x05:
comptype = "surround";
break;
case 0x40:
comptype = "audio description for the visually impaired";
break;
case 0x41:
comptype = "audio for the hard of hearing";
break;
}
component = gst_structure_new ("audio", "type", G_TYPE_STRING,
comptype, "tag", G_TYPE_INT,
DESC_DVB_COMPONENT_tag (comp_descriptor), NULL);
break;
case 0x03: /* subtitles/teletext/vbi */
comptype = "reserved";
switch (DESC_DVB_COMPONENT_type (comp_descriptor)) {
case 0x01:
comptype = "EBU Teletext subtitles";
break;
case 0x02:
comptype = "associated EBU Teletext";
break;
case 0x03:
comptype = "VBI data";
break;
case 0x10:
comptype = "Normal DVB subtitles";
break;
case 0x11:
comptype = "Normal DVB subtitles for 4:3";
break;
case 0x12:
comptype = "Normal DVB subtitles for 16:9";
break;
case 0x13:
comptype = "Normal DVB subtitles for 2.21:1";
break;
case 0x20:
comptype = "Hard of hearing DVB subtitles";
break;
case 0x21:
comptype = "Hard of hearing DVB subtitles for 4:3";
break;
case 0x22:
comptype = "Hard of hearing DVB subtitles for 16:9";
break;
case 0x23:
comptype = "Hard of hearing DVB subtitles for 2.21:1";
break;
}
component = gst_structure_new ("teletext", "type", G_TYPE_STRING,
comptype, "tag", G_TYPE_INT,
DESC_DVB_COMPONENT_tag (comp_descriptor), NULL);
break;
}
if (component) {
g_value_init (&component_value, GST_TYPE_STRUCTURE);
g_value_take_boxed (&component_value, component);
gst_value_list_append_value (&components, &component_value);
g_value_unset (&component_value);
component = NULL;
}
}
gst_structure_set_value (event, "components", &components);
g_value_unset (&components);
g_array_free (component_descriptors, TRUE);
}
gst_mpeg_descriptor_free (mpegdescriptor);
descriptors = g_value_array_new (0);
if (!mpegts_packetizer_parse_descriptors (packetizer,
&data, data + descriptors_loop_length, descriptors)) {
gst_structure_free (event);
g_value_array_free (descriptors);
goto error;
}
gst_structure_id_set (event, QUARK_DESCRIPTORS, G_TYPE_VALUE_ARRAY,
descriptors, NULL);
g_value_array_free (descriptors);
}
g_value_init (&event_value, GST_TYPE_STRUCTURE);
g_value_take_boxed (&event_value, event);
gst_value_list_append_value (&events, &event_value);
g_value_unset (&event_value);
}
if (data != end - 4) {
GST_WARNING ("PID %d invalid EIT parsed %d length %d",
section->pid, (gint) (data - GST_BUFFER_DATA (section->buffer)),
GST_BUFFER_SIZE (section->buffer));
goto error;
}
gst_structure_id_set_value (eit, QUARK_EVENTS, &events);
g_value_unset (&events);
GST_DEBUG ("EIT %" GST_PTR_FORMAT, eit);
return eit;
error:
if (eit)
gst_structure_free (eit);
if (GST_VALUE_HOLDS_LIST (&events))
g_value_unset (&events);
return NULL;
}
GstStructure *
mpegts_packetizer_parse_tdt (MpegTSPacketizer2 * packetizer,
MpegTSPacketizerSection * section)
{
GstStructure *tdt = NULL;
guint16 mjd;
guint year, month, day, hour, minute, second;
guint8 *data, *end, *utc_ptr;
GST_DEBUG ("TDT");
/* length always 8 */
if (G_UNLIKELY (GST_BUFFER_SIZE (section->buffer) != 8)) {
GST_WARNING ("PID %d invalid TDT size %d",
section->pid, section->section_length);
goto error;
}
data = GST_BUFFER_DATA (section->buffer);
end = data + GST_BUFFER_SIZE (section->buffer);
section->table_id = *data++;
section->section_length = GST_READ_UINT16_BE (data) & 0x0FFF;
data += 2;
if (data + section->section_length != end) {
GST_WARNING ("PID %d invalid TDT section length %d expected %d",
section->pid, section->section_length, (gint) (end - data));
goto error;
}
mjd = GST_READ_UINT16_BE (data);
data += 2;
utc_ptr = data;
if (mjd == G_MAXUINT16) {
year = 1900;
month = day = hour = minute = second = 0;
} else {
/* See EN 300 468 Annex C */
year = (guint32) (((mjd - 15078.2) / 365.25));
month = (guint8) ((mjd - 14956.1 - (guint) (year * 365.25)) / 30.6001);
day = mjd - 14956 - (guint) (year * 365.25) - (guint) (month * 30.6001);
if (month == 14 || month == 15) {
year++;
month = month - 1 - 12;
} else {
month--;
}
year += 1900;
hour = ((utc_ptr[0] & 0xF0) >> 4) * 10 + (utc_ptr[0] & 0x0F);
minute = ((utc_ptr[1] & 0xF0) >> 4) * 10 + (utc_ptr[1] & 0x0F);
second = ((utc_ptr[2] & 0xF0) >> 4) * 10 + (utc_ptr[2] & 0x0F);
}
tdt = gst_structure_new ("tdt",
"year", G_TYPE_UINT, year,
"month", G_TYPE_UINT, month,
"day", G_TYPE_UINT, day,
"hour", G_TYPE_UINT, hour,
"minute", G_TYPE_UINT, minute, "second", G_TYPE_UINT, second, NULL);
return tdt;
error:
if (tdt)
gst_structure_free (tdt);
return NULL;
}
void
mpegts_packetizer_clear (MpegTSPacketizer2 * packetizer)
{
if (packetizer->know_packet_size) {
packetizer->know_packet_size = FALSE;
packetizer->packet_size = 0;
if (packetizer->caps != NULL) {
gst_caps_unref (packetizer->caps);
packetizer->caps = NULL;
}
}
if (packetizer->streams) {
int i;
for (i = 0; i < 8192; i++) {
if (packetizer->streams[i]) {
mpegts_packetizer_stream_free (packetizer->streams[i]);
}
}
memset (packetizer->streams, 0, 8192 * sizeof (MpegTSPacketizerStream *));
}
gst_adapter_clear (packetizer->adapter);
packetizer->offset = 0;
packetizer->empty = TRUE;
}
void
mpegts_packetizer_flush (MpegTSPacketizer2 * packetizer)
{
if (packetizer->streams) {
int i;
for (i = 0; i < 8192; i++) {
if (packetizer->streams[i]) {
gst_adapter_flush (packetizer->streams[i]->section_adapter,
packetizer->streams[i]->section_adapter->size);
}
}
}
gst_adapter_flush (packetizer->adapter, packetizer->adapter->size);
packetizer->offset = 0;
packetizer->empty = TRUE;
}
void
mpegts_packetizer_remove_stream (MpegTSPacketizer2 * packetizer, gint16 pid)
{
MpegTSPacketizerStream *stream = packetizer->streams[pid];
if (stream) {
GST_INFO ("Removing stream for PID %d", pid);
mpegts_packetizer_stream_free (stream);
packetizer->streams[pid] = NULL;
}
}
MpegTSPacketizer2 *
mpegts_packetizer_new (void)
{
MpegTSPacketizer2 *packetizer;
packetizer =
GST_MPEGTS_PACKETIZER (g_object_new (GST_TYPE_MPEGTS_PACKETIZER, NULL));
return packetizer;
}
void
mpegts_packetizer_push (MpegTSPacketizer2 * packetizer, GstBuffer * buffer)
{
if (G_UNLIKELY (packetizer->empty)) {
packetizer->empty = FALSE;
packetizer->offset = GST_BUFFER_OFFSET (buffer);
}
GST_DEBUG ("Pushing %u byte from offset %" G_GUINT64_FORMAT,
GST_BUFFER_SIZE (buffer), GST_BUFFER_OFFSET (buffer));
gst_adapter_push (packetizer->adapter, buffer);
}
static gboolean
mpegts_try_discover_packet_size (MpegTSPacketizer2 * packetizer)
{
guint8 *dest;
int i, pos = -1, j;
static const guint psizes[] = {
MPEGTS_NORMAL_PACKETSIZE,
MPEGTS_M2TS_PACKETSIZE,
MPEGTS_DVB_ASI_PACKETSIZE,
MPEGTS_ATSC_PACKETSIZE
};
dest = g_malloc (MPEGTS_MAX_PACKETSIZE * 4);
/* wait for 3 sync bytes */
while (packetizer->adapter->size >= MPEGTS_MAX_PACKETSIZE * 4) {
/* check for sync bytes */
gst_adapter_copy (packetizer->adapter, dest, 0, MPEGTS_MAX_PACKETSIZE * 4);
/* find first sync byte */
pos = -1;
for (i = 0; i < MPEGTS_MAX_PACKETSIZE; i++) {
if (dest[i] == PACKET_SYNC_BYTE) {
for (j = 0; j < 4; j++) {
guint packetsize = psizes[j];
/* check each of the packet size possibilities in turn */
if (dest[i] == PACKET_SYNC_BYTE
&& dest[i + packetsize] == PACKET_SYNC_BYTE
&& dest[i + packetsize * 2] == PACKET_SYNC_BYTE
&& dest[i + packetsize * 3] == PACKET_SYNC_BYTE) {
packetizer->know_packet_size = TRUE;
packetizer->packet_size = packetsize;
packetizer->caps = gst_caps_new_simple ("video/mpegts",
"systemstream", G_TYPE_BOOLEAN, TRUE,
"packetsize", G_TYPE_INT, packetsize, NULL);
if (packetsize == MPEGTS_M2TS_PACKETSIZE)
pos = i - 4;
else
pos = i;
break;
}
}
break;
}
}
if (packetizer->know_packet_size)
break;
/* Skip MPEGTS_MAX_PACKETSIZE */
gst_adapter_flush (packetizer->adapter, MPEGTS_MAX_PACKETSIZE);
packetizer->offset += MPEGTS_MAX_PACKETSIZE;
}
g_free (dest);
if (packetizer->know_packet_size) {
GST_DEBUG ("have packetsize detected: %d of %u bytes",
packetizer->know_packet_size, packetizer->packet_size);
/* flush to sync byte */
if (pos > 0) {
GST_DEBUG ("Flushing out %d bytes", pos);
gst_adapter_flush (packetizer->adapter, pos);
packetizer->offset += pos;
}
} else {
/* drop invalid data and move to the next possible packets */
GST_DEBUG ("Could not determine packet size");
}
return packetizer->know_packet_size;
}
gboolean
mpegts_packetizer_has_packets (MpegTSPacketizer2 * packetizer)
{
if (G_UNLIKELY (packetizer->know_packet_size == FALSE)) {
if (!mpegts_try_discover_packet_size (packetizer))
return FALSE;
}
return packetizer->adapter->size >= packetizer->packet_size;
}
MpegTSPacketizerPacketReturn
mpegts_packetizer_next_packet (MpegTSPacketizer2 * packetizer,
MpegTSPacketizerPacket * packet)
{
guint avail;
packet->buffer = NULL;
if (G_UNLIKELY (!packetizer->know_packet_size)) {
if (!mpegts_try_discover_packet_size (packetizer))
return PACKET_NEED_MORE;
}
while ((avail = packetizer->adapter->size) >= packetizer->packet_size) {
packet->buffer = gst_adapter_take_buffer (packetizer->adapter,
packetizer->packet_size);
/* M2TS packets don't start with the sync byte, all other variants do */
if (packetizer->packet_size == MPEGTS_M2TS_PACKETSIZE) {
packet->data_start = GST_BUFFER_DATA (packet->buffer) + 4;
} else {
packet->data_start = GST_BUFFER_DATA (packet->buffer);
}
/* ALL mpeg-ts variants contain 188 bytes of data. Those with bigger packet
* sizes contain either extra data (timesync, FEC, ..) either before or after
* the data */
packet->data_end = packet->data_start + 188;
GST_BUFFER_OFFSET (packet->buffer) = packet->offset = packetizer->offset;
GST_DEBUG ("offset %" G_GUINT64_FORMAT, packet->offset);
packetizer->offset += packetizer->packet_size;
GST_MEMDUMP ("buffer", GST_BUFFER_DATA (packet->buffer), 16);
GST_MEMDUMP ("data_start", packet->data_start, 16);
GST_BUFFER_TIMESTAMP (packet->buffer) =
gst_adapter_prev_timestamp (packetizer->adapter, NULL);
/* Check sync byte */
if (G_UNLIKELY (packet->data_start[0] != 0x47)) {
guint i;
GstBuffer *tmpbuf;
GST_LOG ("Lost sync %d", packetizer->packet_size);
/* Find the 0x47 in the buffer */
for (i = 0; i < packetizer->packet_size; i++)
if (GST_BUFFER_DATA (packet->buffer)[i] == 0x47)
break;
if (G_UNLIKELY (i == packetizer->packet_size)) {
GST_ERROR ("REALLY lost the sync");
gst_buffer_unref (packet->buffer);
goto done;
}
if (packetizer->packet_size == MPEGTS_M2TS_PACKETSIZE) {
if (i >= 4)
i -= 4;
else
i += 188;
}
/* Pop out the remaining data... */
GST_BUFFER_DATA (packet->buffer) += i;
GST_BUFFER_SIZE (packet->buffer) -= i;
GST_BUFFER_OFFSET (packet->buffer) += i;
tmpbuf =
gst_adapter_take_buffer (packetizer->adapter,
packetizer->adapter->size);
/* ... and push everything back in */
gst_adapter_push (packetizer->adapter, packet->buffer);
gst_adapter_push (packetizer->adapter, tmpbuf);
continue;
}
return mpegts_packetizer_parse_packet (packetizer, packet);
}
done:
return PACKET_NEED_MORE;
}
void
mpegts_packetizer_clear_packet (MpegTSPacketizer2 * packetizer,
MpegTSPacketizerPacket * packet)
{
memset (packet, 0, sizeof (MpegTSPacketizerPacket));
}
gboolean
mpegts_packetizer_push_section (MpegTSPacketizer2 * packetizer,
MpegTSPacketizerPacket * packet, MpegTSPacketizerSection * section)
{
gboolean res = FALSE;
MpegTSPacketizerStream *stream;
guint8 pointer, table_id;
guint16 subtable_extension;
guint section_length;
GstBuffer *sub_buf;
guint8 *data;
data = packet->data;
section->pid = packet->pid;
if (packet->payload_unit_start_indicator == 1) {
pointer = *data++;
if (data + pointer > packet->data_end) {
GST_WARNING ("PID %d PSI section pointer points past the end "
"of the buffer", packet->pid);
goto out;
}
data += pointer;
}
/* TDT and TOT sections (see ETSI EN 300 468 5.2.5)
* these sections do not extend to several packets so we don't need to use the
* sections filter. */
if (packet->pid == 0x14) {
table_id = data[0];
section->section_length = GST_READ_UINT24_BE (data) & 0x000FFF;
if (data - GST_BUFFER_DATA (packet->buffer) + section->section_length + 3 >
GST_BUFFER_SIZE (packet->buffer)) {
GST_WARNING ("PID %dd PSI section length extends past the end "
"of the buffer", packet->pid);
goto out;
}
section->buffer = gst_buffer_create_sub (packet->buffer,
data - GST_BUFFER_DATA (packet->buffer), section->section_length + 3);
section->table_id = table_id;
section->complete = TRUE;
res = TRUE;
GST_DEBUG ("TDT section pid:%d table_id:%d section_length: %d\n",
packet->pid, table_id, section->section_length);
goto out;
}
/* create a sub buffer from the start of the section (table_id and
* section_length included) to the end */
sub_buf = gst_buffer_create_sub (packet->buffer,
data - GST_BUFFER_DATA (packet->buffer), packet->data_end - data);
stream = packetizer->streams[packet->pid];
if (stream == NULL) {
stream = mpegts_packetizer_stream_new ();
packetizer->streams[packet->pid] = stream;
}
if (packet->payload_unit_start_indicator) {
table_id = *data++;
/* subtable_extension should be read from 4th and 5th bytes only if
* section_syntax_indicator is 1 */
if ((data[0] & 0x80) == 0)
subtable_extension = 0;
else
subtable_extension = GST_READ_UINT16_BE (data + 2);
GST_DEBUG ("pid: %d table_id %d sub_table_extension %d",
packet->pid, table_id, subtable_extension);
section_length = GST_READ_UINT16_BE (data) & 0x0FFF;
if (stream->continuity_counter != CONTINUITY_UNSET) {
GST_DEBUG
("PID %d table_id %d sub_table_extension %d payload_unit_start_indicator set but section "
"not complete (last_continuity: %d continuity: %d sec len %d buffer %d avail %d",
packet->pid, table_id, subtable_extension, stream->continuity_counter,
packet->continuity_counter, section_length, GST_BUFFER_SIZE (sub_buf),
stream->section_adapter->size);
mpegts_packetizer_clear_section (packetizer, stream);
} else {
GST_DEBUG
("pusi set and new stream section is %d long and data we have is: %d",
section_length, (gint) (packet->data_end - packet->data));
}
stream->continuity_counter = packet->continuity_counter;
stream->section_length = section_length;
stream->section_table_id = table_id;
stream->offset = packet->offset;
gst_adapter_push (stream->section_adapter, sub_buf);
res = TRUE;
} else if (stream->continuity_counter != CONTINUITY_UNSET &&
(packet->continuity_counter == stream->continuity_counter + 1 ||
(stream->continuity_counter == MAX_CONTINUITY &&
packet->continuity_counter == 0))) {
stream->continuity_counter = packet->continuity_counter;
gst_adapter_push (stream->section_adapter, sub_buf);
res = TRUE;
} else {
if (stream->continuity_counter == CONTINUITY_UNSET)
GST_DEBUG ("PID %d waiting for pusi", packet->pid);
else
GST_DEBUG ("PID %d section discontinuity "
"(last_continuity: %d continuity: %d", packet->pid,
stream->continuity_counter, packet->continuity_counter);
mpegts_packetizer_clear_section (packetizer, stream);
gst_buffer_unref (sub_buf);
}
if (res) {
/* we pushed some data in the section adapter, see if the section is
* complete now */
/* >= as sections can be padded and padding is not included in
* section_length */
if (stream->section_adapter->size >= stream->section_length + 3) {
res = mpegts_packetizer_parse_section_header (packetizer,
stream, section);
/* flush stuffing bytes */
mpegts_packetizer_clear_section (packetizer, stream);
} else {
GST_DEBUG ("section not complete");
/* section not complete yet */
section->complete = FALSE;
}
} else {
GST_WARNING ("section not complete");
section->complete = FALSE;
}
out:
packet->data = data;
GST_DEBUG ("result: %d complete: %d", res, section->complete);
return res;
}
static void
_init_local (void)
{
GST_DEBUG_CATEGORY_INIT (mpegts_packetizer_debug, "mpegtspacketizer", 0,
"MPEG transport stream parser");
QUARK_PAT = g_quark_from_string ("pat");
QUARK_TRANSPORT_STREAM_ID = g_quark_from_string ("transport-stream-id");
QUARK_PROGRAM_NUMBER = g_quark_from_string ("program-number");
QUARK_PID = g_quark_from_string ("pid");
QUARK_PROGRAMS = g_quark_from_string ("programs");
QUARK_PMT = g_quark_from_string ("pmt");
QUARK_PCR_PID = g_quark_from_string ("pcr-pid");
QUARK_VERSION_NUMBER = g_quark_from_string ("version-number");
QUARK_DESCRIPTORS = g_quark_from_string ("descriptors");
QUARK_STREAM_TYPE = g_quark_from_string ("stream-type");
QUARK_STREAMS = g_quark_from_string ("streams");
QUARK_NIT = g_quark_from_string ("nit");
QUARK_NETWORK_ID = g_quark_from_string ("network-id");
QUARK_CURRENT_NEXT_INDICATOR = g_quark_from_string ("current-next-indicator");
QUARK_ACTUAL_NETWORK = g_quark_from_string ("actual-network");
QUARK_NETWORK_NAME = g_quark_from_string ("network-name");
QUARK_ORIGINAL_NETWORK_ID = g_quark_from_string ("original-network-id");
QUARK_TRANSPORTS = g_quark_from_string ("transports");
QUARK_SDT = g_quark_from_string ("sdt");
QUARK_ACTUAL_TRANSPORT_STREAM =
g_quark_from_string ("actual-transport-stream");
QUARK_SERVICES = g_quark_from_string ("services");
QUARK_EIT = g_quark_from_string ("eit");
QUARK_SERVICE_ID = g_quark_from_string ("service-id");
QUARK_PRESENT_FOLLOWING = g_quark_from_string ("present-following");
QUARK_SEGMENT_LAST_SECTION_NUMBER =
g_quark_from_string ("segment-last-section-number");
QUARK_LAST_TABLE_ID = g_quark_from_string ("last-table-id");
QUARK_EVENTS = g_quark_from_string ("events");
}
/**
* @text: The text you want to get the encoding from
* @start_text: Location where the beginning of the actual text is stored
* @is_multibyte: Location where information whether it's a multibyte encoding
* or not is stored
* @returns: Name of encoding or NULL of encoding could not be detected.
*
* The returned string should be freed with g_free () when no longer needed.
*/
static gchar *
get_encoding (const gchar * text, guint * start_text, gboolean * is_multibyte)
{
gchar *encoding;
guint8 firstbyte;
g_return_val_if_fail (text != NULL, NULL);
firstbyte = (guint8) text[0];
/* ETSI EN 300 468, "Selection of character table" */
if (firstbyte <= 0x0B) {
encoding = g_strdup_printf ("iso8859-%u", firstbyte + 4);
*start_text = 1;
*is_multibyte = FALSE;
} else if (firstbyte >= 0x20) {
encoding = g_strdup ("iso6937");
*start_text = 0;
*is_multibyte = FALSE;
} else if (firstbyte == 0x10) {
guint16 table;
gchar table_str[6];
text++;
table = GST_READ_UINT16_BE (text);
g_snprintf (table_str, 6, "%d", table);
encoding = g_strconcat ("iso8859-", table_str, NULL);
*start_text = 3;
*is_multibyte = FALSE;
} else if (firstbyte == 0x11) {
encoding = g_strdup ("ISO-10646/UCS2");
*start_text = 1;
*is_multibyte = TRUE;
} else if (firstbyte == 0x12) {
/* EUC-KR implements KSX1001 */
encoding = g_strdup ("EUC-KR");
*start_text = 1;
*is_multibyte = TRUE;
} else if (firstbyte == 0x13) {
encoding = g_strdup ("GB2312");
*start_text = 1;
*is_multibyte = FALSE;
} else if (firstbyte == 0x14) {
encoding = g_strdup ("UTF-16BE");
*start_text = 1;
*is_multibyte = TRUE;
} else if (firstbyte == 0x15) {
encoding = g_strdup ("ISO-10646/UTF8");
*start_text = 1;
*is_multibyte = FALSE;
} else {
/* reserved */
encoding = NULL;
*start_text = 0;
*is_multibyte = FALSE;
}
GST_DEBUG
("Found encoding %s, first byte is 0x%02x, start_text: %u, is_multibyte: %d",
encoding, firstbyte, *start_text, *is_multibyte);
return encoding;
}
/**
* @text: The text to convert. It may include pango markup (<b> and </b>)
* @length: The length of the string -1 if it's nul-terminated
* @start: Where to start converting in the text
* @encoding: The encoding of text
* @is_multibyte: Whether the encoding is a multibyte encoding
* @error: The location to store the error, or NULL to ignore errors
* @returns: UTF-8 encoded string
*
* Convert text to UTF-8.
*/
static gchar *
convert_to_utf8 (const gchar * text, gint length, guint start,
const gchar * encoding, gboolean is_multibyte, GError ** error)
{
gchar *new_text;
GByteArray *sb;
gint i;
g_return_val_if_fail (text != NULL, NULL);
g_return_val_if_fail (encoding != NULL, NULL);
text += start;
sb = g_byte_array_sized_new (length * 1.1);
if (is_multibyte) {
if (length == -1) {
while (*text != '\0') {
guint16 code = GST_READ_UINT16_BE (text);
switch (code) {
case 0xE086: /* emphasis on */
case 0xE087: /* emphasis off */
/* skip it */
break;
case 0xE08A:{
guint8 nl[] = { 0x00, 0x0A }; /* new line */
g_byte_array_append (sb, nl, 2);
break;
}
default:
g_byte_array_append (sb, (guint8 *) text, 2);
break;
}
text += 2;
}
} else {
for (i = 0; i < length; i += 2) {
guint16 code = GST_READ_UINT16_BE (text);
switch (code) {
case 0xE086: /* emphasis on */
case 0xE087: /* emphasis off */
/* skip it */
break;
case 0xE08A:{
guint8 nl[] = { 0x00, 0x0A }; /* new line */
g_byte_array_append (sb, nl, 2);
break;
}
default:
g_byte_array_append (sb, (guint8 *) text, 2);
break;
}
text += 2;
}
}
} else {
if (length == -1) {
while (*text != '\0') {
guint8 code = (guint8) (*text);
switch (code) {
case 0x86: /* emphasis on */
case 0x87: /* emphasis off */
/* skip it */
break;
case 0x8A:
g_byte_array_append (sb, (guint8 *) "\n", 1);
break;
default:
g_byte_array_append (sb, &code, 1);
break;
}
text++;
}
} else {
for (i = 0; i < length; i++) {
guint8 code = (guint8) (*text);
switch (code) {
case 0x86: /* emphasis on */
case 0x87: /* emphasis off */
/* skip it */
break;
case 0x8A:
g_byte_array_append (sb, (guint8 *) "\n", 1);
break;
default:
g_byte_array_append (sb, &code, 1);
break;
}
text++;
}
}
}
if (sb->len > 0) {
new_text =
g_convert ((gchar *) sb->data, sb->len, "utf-8", encoding, NULL, NULL,
error);
} else {
new_text = g_strdup ("");
}
g_byte_array_free (sb, TRUE);
return new_text;
}
static gchar *
get_encoding_and_convert (const gchar * text, guint length)
{
GError *error = NULL;
gchar *converted_str;
gchar *encoding;
guint start_text = 0;
gboolean is_multibyte;
g_return_val_if_fail (text != NULL, NULL);
if (length == 0)
return g_strdup ("");
encoding = get_encoding (text, &start_text, &is_multibyte);
if (encoding == NULL) {
GST_WARNING ("Could not detect encoding");
converted_str = g_strndup (text, length);
} else {
converted_str = convert_to_utf8 (text, length - start_text, start_text,
encoding, is_multibyte, &error);
if (error != NULL) {
GST_WARNING ("Could not convert string, encoding is %s: %s",
encoding, error->message);
g_error_free (error);
error = NULL;
/* The first part of ISO 6937 is identical to ISO 8859-9, but
* they differ in the second part. Some channels don't
* provide the first byte that indicates ISO 8859-9 encoding.
* If decoding from ISO 6937 failed, we try ISO 8859-9 here.
*/
if (strcmp (encoding, "iso6937") == 0) {
GST_INFO ("Trying encoding ISO 8859-9");
converted_str = convert_to_utf8 (text, length, 0,
"iso8859-9", FALSE, &error);
if (error != NULL) {
GST_WARNING
("Could not convert string while assuming encoding ISO 8859-9: %s",
error->message);
g_error_free (error);
goto failed;
}
} else {
goto failed;
}
}
g_free (encoding);
}
return converted_str;
failed:
{
g_free (encoding);
text += start_text;
return g_strndup (text, length - start_text);
}
}
/**
* mpegts_packetizer_reset_skew:
* @packetizer: an #MpegTSPacketizer2
*
* Reset the skew calculations in @packetizer.
*/
static void
mpegts_packetizer_reset_skew (MpegTSPacketizer2 * packetizer)
{
packetizer->base_time = GST_CLOCK_TIME_NONE;
packetizer->base_pcrtime = GST_CLOCK_TIME_NONE;
packetizer->last_pcrtime = GST_CLOCK_TIME_NONE;
packetizer->window_pos = 0;
packetizer->window_filling = TRUE;
packetizer->window_min = 0;
packetizer->skew = 0;
packetizer->prev_send_diff = GST_CLOCK_TIME_NONE;
packetizer->prev_out_time = GST_CLOCK_TIME_NONE;
GST_DEBUG ("reset skew correction");
}
static void
mpegts_packetizer_resync (MpegTSPacketizer2 * packetizer, GstClockTime time,
GstClockTime gstpcrtime, gboolean reset_skew)
{
packetizer->base_time = time;
packetizer->base_pcrtime = gstpcrtime;
packetizer->prev_out_time = GST_CLOCK_TIME_NONE;
packetizer->prev_send_diff = GST_CLOCK_TIME_NONE;
if (reset_skew) {
packetizer->window_filling = TRUE;
packetizer->window_pos = 0;
packetizer->window_min = 0;
packetizer->window_size = 0;
packetizer->skew = 0;
}
}
/* Code mostly copied from -good/gst/rtpmanager/rtpjitterbuffer.c */
/* For the clock skew we use a windowed low point averaging algorithm as can be
* found in Fober, Orlarey and Letz, 2005, "Real Time Clock Skew Estimation
* over Network Delays":
* http://www.grame.fr/Ressources/pub/TR-050601.pdf
* http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.102.1546
*
* The idea is that the jitter is composed of:
*
* J = N + n
*
* N : a constant network delay.
* n : random added noise. The noise is concentrated around 0
*
* In the receiver we can track the elapsed time at the sender with:
*
* send_diff(i) = (Tsi - Ts0);
*
* Tsi : The time at the sender at packet i
* Ts0 : The time at the sender at the first packet
*
* This is the difference between the RTP timestamp in the first received packet
* and the current packet.
*
* At the receiver we have to deal with the jitter introduced by the network.
*
* recv_diff(i) = (Tri - Tr0)
*
* Tri : The time at the receiver at packet i
* Tr0 : The time at the receiver at the first packet
*
* Both of these values contain a jitter Ji, a jitter for packet i, so we can
* write:
*
* recv_diff(i) = (Cri + D + ni) - (Cr0 + D + n0))
*
* Cri : The time of the clock at the receiver for packet i
* D + ni : The jitter when receiving packet i
*
* We see that the network delay is irrelevant here as we can elliminate D:
*
* recv_diff(i) = (Cri + ni) - (Cr0 + n0))
*
* The drift is now expressed as:
*
* Drift(i) = recv_diff(i) - send_diff(i);
*
* We now keep the W latest values of Drift and find the minimum (this is the
* one with the lowest network jitter and thus the one which is least affected
* by it). We average this lowest value to smooth out the resulting network skew.
*
* Both the window and the weighting used for averaging influence the accuracy
* of the drift estimation. Finding the correct parameters turns out to be a
* compromise between accuracy and inertia.
*
* We use a 2 second window or up to 512 data points, which is statistically big
* enough to catch spikes (FIXME, detect spikes).
* We also use a rather large weighting factor (125) to smoothly adapt. During
* startup, when filling the window, we use a parabolic weighting factor, the
* more the window is filled, the faster we move to the detected possible skew.
*
* Returns: @time adjusted with the clock skew.
*/
static GstClockTime
calculate_skew (MpegTSPacketizer2 * packetizer, guint64 pcrtime,
GstClockTime time)
{
guint64 send_diff, recv_diff;
gint64 delta;
gint64 old;
gint pos, i;
GstClockTime gstpcrtime, out_time;
guint64 slope;
gstpcrtime = PCRTIME_TO_GSTTIME (pcrtime);
/* keep track of the last extended pcrtime */
packetizer->last_pcrtime = gstpcrtime;
/* first time, lock on to time and gstpcrtime */
if (G_UNLIKELY (!GST_CLOCK_TIME_IS_VALID (packetizer->base_time))) {
packetizer->base_time = time;
packetizer->prev_out_time = GST_CLOCK_TIME_NONE;
GST_DEBUG ("Taking new base time %" GST_TIME_FORMAT, GST_TIME_ARGS (time));
}
if (G_UNLIKELY (!GST_CLOCK_TIME_IS_VALID (packetizer->base_pcrtime))) {
packetizer->base_pcrtime = gstpcrtime;
packetizer->prev_send_diff = -1;
GST_DEBUG ("Taking new base pcrtime %" GST_TIME_FORMAT,
GST_TIME_ARGS (gstpcrtime));
}
if (G_LIKELY (gstpcrtime >= packetizer->base_pcrtime))
send_diff = gstpcrtime - packetizer->base_pcrtime;
else if (GST_CLOCK_TIME_IS_VALID (time)) {
/* elapsed time at sender, timestamps can go backwards and thus be smaller
* than our base time, take a new base time in that case. */
GST_WARNING ("backward timestamps at server, taking new base time");
mpegts_packetizer_resync (packetizer, time, gstpcrtime, FALSE);
send_diff = 0;
} else {
GST_WARNING ("backward timestamps at server but no timestamps");
send_diff = 0;
/* at least try to get a new timestamp.. */
packetizer->base_time = -1;
}
GST_DEBUG ("gstpcr %" GST_TIME_FORMAT ", buftime %" GST_TIME_FORMAT ", base %"
GST_TIME_FORMAT ", send_diff %" GST_TIME_FORMAT,
GST_TIME_ARGS (gstpcrtime), GST_TIME_ARGS (time),
GST_TIME_ARGS (packetizer->base_pcrtime), GST_TIME_ARGS (send_diff));
/* we don't have an arrival timestamp so we can't do skew detection. we
* should still apply a timestamp based on RTP timestamp and base_time */
if (!GST_CLOCK_TIME_IS_VALID (time)
|| !GST_CLOCK_TIME_IS_VALID (packetizer->base_time))
goto no_skew;
/* elapsed time at receiver, includes the jitter */
recv_diff = time - packetizer->base_time;
/* measure the diff */
delta = ((gint64) recv_diff) - ((gint64) send_diff);
/* measure the slope, this gives a rought estimate between the sender speed
* and the receiver speed. This should be approximately 8, higher values
* indicate a burst (especially when the connection starts) */
slope = recv_diff > 0 ? (send_diff * 8) / recv_diff : 8;
GST_DEBUG ("time %" GST_TIME_FORMAT ", base %" GST_TIME_FORMAT ", recv_diff %"
GST_TIME_FORMAT ", slope %" G_GUINT64_FORMAT, GST_TIME_ARGS (time),
GST_TIME_ARGS (packetizer->base_time), GST_TIME_ARGS (recv_diff), slope);
/* if the difference between the sender timeline and the receiver timeline
* changed too quickly we have to resync because the server likely restarted
* its timestamps. */
if (ABS (delta - packetizer->skew) > GST_SECOND) {
GST_WARNING ("delta - skew: %" GST_TIME_FORMAT " too big, reset skew",
GST_TIME_ARGS (delta - packetizer->skew));
mpegts_packetizer_resync (packetizer, time, gstpcrtime, TRUE);
send_diff = 0;
delta = 0;
}
pos = packetizer->window_pos;
if (G_UNLIKELY (packetizer->window_filling)) {
/* we are filling the window */
GST_DEBUG ("filling %d, delta %" G_GINT64_FORMAT, pos, delta);
packetizer->window[pos++] = delta;
/* calc the min delta we observed */
if (G_UNLIKELY (pos == 1 || delta < packetizer->window_min))
packetizer->window_min = delta;
if (G_UNLIKELY (send_diff >= MAX_TIME || pos >= MAX_WINDOW)) {
packetizer->window_size = pos;
/* window filled */
GST_DEBUG ("min %" G_GINT64_FORMAT, packetizer->window_min);
/* the skew is now the min */
packetizer->skew = packetizer->window_min;
packetizer->window_filling = FALSE;
} else {
gint perc_time, perc_window, perc;
/* figure out how much we filled the window, this depends on the amount of
* time we have or the max number of points we keep. */
perc_time = send_diff * 100 / MAX_TIME;
perc_window = pos * 100 / MAX_WINDOW;
perc = MAX (perc_time, perc_window);
/* make a parabolic function, the closer we get to the MAX, the more value
* we give to the scaling factor of the new value */
perc = perc * perc;
/* quickly go to the min value when we are filling up, slowly when we are
* just starting because we're not sure it's a good value yet. */
packetizer->skew =
(perc * packetizer->window_min + ((10000 -
perc) * packetizer->skew)) / 10000;
packetizer->window_size = pos + 1;
}
} else {
/* pick old value and store new value. We keep the previous value in order
* to quickly check if the min of the window changed */
old = packetizer->window[pos];
packetizer->window[pos++] = delta;
if (G_UNLIKELY (delta <= packetizer->window_min)) {
/* if the new value we inserted is smaller or equal to the current min,
* it becomes the new min */
packetizer->window_min = delta;
} else if (G_UNLIKELY (old == packetizer->window_min)) {
gint64 min = G_MAXINT64;
/* if we removed the old min, we have to find a new min */
for (i = 0; i < packetizer->window_size; i++) {
/* we found another value equal to the old min, we can stop searching now */
if (packetizer->window[i] == old) {
min = old;
break;
}
if (packetizer->window[i] < min)
min = packetizer->window[i];
}
packetizer->window_min = min;
}
/* average the min values */
packetizer->skew =
(packetizer->window_min + (124 * packetizer->skew)) / 125;
GST_DEBUG ("delta %" G_GINT64_FORMAT ", new min: %" G_GINT64_FORMAT, delta,
packetizer->window_min);
}
/* wrap around in the window */
if (G_UNLIKELY (pos >= packetizer->window_size))
pos = 0;
packetizer->window_pos = pos;
no_skew:
/* the output time is defined as the base timestamp plus the PCR time
* adjusted for the clock skew .*/
if (packetizer->base_time != -1) {
out_time = packetizer->base_time + send_diff;
/* skew can be negative and we don't want to make invalid timestamps */
if (packetizer->skew < 0 && out_time < -packetizer->skew) {
out_time = 0;
} else {
out_time += packetizer->skew;
}
/* check if timestamps are not going backwards, we can only check this if we
* have a previous out time and a previous send_diff */
if (G_LIKELY (packetizer->prev_out_time != -1
&& packetizer->prev_send_diff != -1)) {
/* now check for backwards timestamps */
if (G_UNLIKELY (
/* if the server timestamps went up and the out_time backwards */
(send_diff > packetizer->prev_send_diff
&& out_time < packetizer->prev_out_time) ||
/* if the server timestamps went backwards and the out_time forwards */
(send_diff < packetizer->prev_send_diff
&& out_time > packetizer->prev_out_time) ||
/* if the server timestamps did not change */
send_diff == packetizer->prev_send_diff)) {
GST_DEBUG ("backwards timestamps, using previous time");
out_time = GSTTIME_TO_MPEGTIME (out_time);
}
}
} else {
/* We simply use the pcrtime without applying any skew compensation */
out_time = time;
}
packetizer->prev_out_time = out_time;
packetizer->prev_send_diff = send_diff;
GST_DEBUG ("skew %" G_GINT64_FORMAT ", out %" GST_TIME_FORMAT,
packetizer->skew, GST_TIME_ARGS (out_time));
return out_time;
}
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