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gstreamer/gst/mpegtsdemux/mpegtspacketizer.c
Edward Hervey a4899af8d6 mpegtspacketizer: Offset calculation 
Allows PCR<=>PTS<=>offset estimation/calculation
Right now the calculation is very naive, but can be extended later on
without disrupting the code in tsdemux/mpegtsbase
2012-03-01 18:15:51 +01:00

3237 lines
104 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;
#define MPEGTS_PACKETIZER_GET_PRIVATE(obj) \
(G_TYPE_INSTANCE_GET_PRIVATE ((obj), GST_TYPE_MPEGTS_PACKETIZER, MpegTSPacketizerPrivate))
static void _init_local (void);
G_DEFINE_TYPE_EXTENDED (MpegTSPacketizer2, mpegts_packetizer, G_TYPE_OBJECT, 0,
_init_local ());
typedef struct
{
guint64 offset; /* offset in upstream */
guint64 pcr; /* pcr (wraparound not fixed) */
} MpegTSPacketizerOffset;
struct _MpegTSPacketizerPrivate
{
/* Used for bitrate calculation */
/* FIXME : Replace this later on with a balanced tree or sequence */
guint64 first_offset;
guint64 first_pcr;
guint64 last_offset;
guint64 last_pcr;
/* Reference offset */
guint64 refoffset;
guint nb_seen_offsets;
};
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 record_pcr (MpegTSPacketizer2 * packetizer, guint64 pcr,
guint64 offset);
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;
g_type_class_add_private (klass, sizeof (MpegTSPacketizerPrivate));
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->priv = MPEGTS_PACKETIZER_GET_PRIVATE (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;
packetizer->calculate_offset = FALSE;
mpegts_packetizer_reset_skew (packetizer);
packetizer->priv->first_offset = -1;
packetizer->priv->first_pcr = -1;
packetizer->priv->last_offset = -1;
packetizer->priv->last_pcr = -1;
packetizer->priv->nb_seen_offsets = 0;
packetizer->priv->refoffset = -1;
}
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);
}
static inline 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);
*data += 6;
GST_DEBUG ("pcr %" G_GUINT64_FORMAT " (%" GST_TIME_FORMAT ")",
packet->pcr, GST_TIME_ARGS (PCRTIME_TO_GSTTIME (packet->pcr)));
if (packetizer->calculate_skew)
GST_BUFFER_TIMESTAMP (packet->buffer) =
calculate_skew (packetizer, packet->pcr,
GST_BUFFER_TIMESTAMP (packet->buffer));
if (packetizer->calculate_offset)
record_pcr (packetizer, packet->pcr, packet->offset);
}
/* OPCR */
if (afcflags & MPEGTS_AFC_OPCR_FLAG) {
packet->opcr = mpegts_packetizer_compute_pcr (data);
/* *data += 6; */
GST_DEBUG ("opcr %" G_GUINT64_FORMAT " (%" GST_TIME_FORMAT ")",
packet->pcr, GST_TIME_ARGS (PCRTIME_TO_GSTTIME (packet->pcr)));
}
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;
}
MpegTSPacketizerPacketReturn
mpegts_packetizer_process_next_packet (MpegTSPacketizer2 * packetizer)
{
MpegTSPacketizerPacket packet;
return mpegts_packetizer_next_packet (packetizer, &packet);
}
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)
{
/* FIXME : These variables should be *per* PCR PID */
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)
{
/* FIXME : These variables should be *per* PCR PID */
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;
/* Ignore packets received at 100% the same time (i.e. from the same input buffer) */
if (G_UNLIKELY (time == packetizer->prev_in_time
&& GST_CLOCK_TIME_IS_VALID (packetizer->prev_in_time)))
goto no_skew;
/* 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_in_time = 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;
}
static void
record_pcr (MpegTSPacketizer2 * packetizer, guint64 pcr, guint64 offset)
{
MpegTSPacketizerPrivate *priv = packetizer->priv;
/* Check against first PCR */
if (priv->first_pcr == -1 || priv->first_offset > offset) {
GST_DEBUG ("Recording first value. PCR:%" G_GUINT64_FORMAT " offset:%"
G_GUINT64_FORMAT, pcr, offset);
priv->first_pcr = pcr;
priv->first_offset = offset;
priv->nb_seen_offsets++;
} else
/* If we didn't update the first PCR, let's check against last PCR */
if (priv->last_pcr == -1 || priv->last_offset < offset) {
GST_DEBUG ("Recording last value. PCR:%" G_GUINT64_FORMAT " offset:%"
G_GUINT64_FORMAT, pcr, offset);
priv->last_pcr = pcr;
priv->last_offset = offset;
priv->nb_seen_offsets++;
}
}
guint
mpegts_packetizer_get_seen_pcr (MpegTSPacketizer2 * packetizer)
{
return packetizer->priv->nb_seen_offsets;
}
GstClockTime
mpegts_packetizer_offset_to_ts (MpegTSPacketizer2 * packetizer, guint64 offset)
{
MpegTSPacketizerPrivate *priv = packetizer->priv;
GstClockTime res;
if (G_UNLIKELY (!packetizer->calculate_offset))
return GST_CLOCK_TIME_NONE;
if (G_UNLIKELY (priv->refoffset == -1))
return GST_CLOCK_TIME_NONE;
if (G_UNLIKELY (offset < priv->refoffset))
return GST_CLOCK_TIME_NONE;
/* Convert byte difference into time difference */
res = PCRTIME_TO_GSTTIME (gst_util_uint64_scale (offset - priv->refoffset,
priv->last_pcr - priv->first_pcr,
priv->last_offset - priv->first_offset));
GST_DEBUG ("Returning timestamp %" GST_TIME_FORMAT " for offset %"
G_GUINT64_FORMAT, GST_TIME_ARGS (res), offset);
return res;
}
GstClockTime
mpegts_packetizer_pts_to_ts (MpegTSPacketizer2 * packetizer, guint64 pts)
{
/* Use clock skew if present */
if (packetizer->calculate_skew
&& GST_CLOCK_TIME_IS_VALID (packetizer->base_time)) {
GST_DEBUG ("pts %" G_GUINT64_FORMAT " base_pcrtime:%" G_GUINT64_FORMAT
" base_time:%" GST_TIME_FORMAT, pts, packetizer->base_pcrtime,
GST_TIME_ARGS (packetizer->base_time));
return pts - packetizer->base_pcrtime + packetizer->base_time +
packetizer->skew;
}
/* If not, use pcr observations */
if (packetizer->calculate_offset && packetizer->priv->first_pcr != -1)
return pts - PCRTIME_TO_GSTTIME (packetizer->priv->first_pcr);
return GST_CLOCK_TIME_NONE;
}
guint64
mpegts_packetizer_ts_to_offset (MpegTSPacketizer2 * packetizer, GstClockTime ts)
{
MpegTSPacketizerPrivate *priv = packetizer->priv;
guint64 res;
if (!packetizer->calculate_offset || packetizer->priv->first_pcr == -1)
return -1;
GST_DEBUG ("ts(pcr) %" G_GUINT64_FORMAT " first_pcr:%" G_GUINT64_FORMAT,
GSTTIME_TO_MPEGTIME (ts), priv->first_pcr);
/* Convert ts to PCRTIME */
res = gst_util_uint64_scale (GSTTIME_TO_PCRTIME (ts),
priv->last_offset - priv->first_offset, priv->last_pcr - priv->first_pcr);
res += priv->first_offset + priv->refoffset;
GST_DEBUG ("Returning offset %" G_GUINT64_FORMAT " for ts %" GST_TIME_FORMAT,
res, GST_TIME_ARGS (ts));
return res;
}
void
mpegts_packetizer_set_reference_offset (MpegTSPacketizer2 * packetizer,
guint64 refoffset)
{
GST_DEBUG ("Setting reference offset to %" G_GUINT64_FORMAT, refoffset);
packetizer->priv->refoffset = refoffset;
}
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