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mpegtsbase: Remove no-longer needed code

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Since we now send all sections to the packetizer, we no longer need to do
anymore in-depth checks for the validity of a section.

The choice boils down to:
1) Is it from a known PES pid ? If so pass it on (which might be just pushing
   downstream in the case of tsparse, or accumulating PES data for tsdemux)
2) Is it from a known SI pid ? If so pass it to the section packetizer
This commit is contained in:
Edward Hervey 2013-07-05 16:46:42 +02:00
parent 32f33c9448
commit 9da7551993
1 changed files with 9 additions and 86 deletions
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95
gst/mpegtsdemux/mpegtsbase.c
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@ -595,86 +595,6 @@ mpegts_base_activate_program (MpegTSBase * base, MpegTSBaseProgram * program,
GST_DEBUG_OBJECT (base, "new pmt activated");
}
/* FIXME : This method is fundamentally wrong (and potentially expensive)
* A packet is only a PSI if it's from a known PSI stream.
*
* The proper fix is to ensure the rest of mpegtsbase properly ensures
* that PSI streams are properly detected.
*
* This requires:
* * Initially setting all PSI PID which are generic accross formats
* * When we know the "variant" of the stream (Bluray, DVB, ATSC, ISDB,...)
* we properly set the expected PSI
* * Properly unsetting expected know-PSI PID the moment we see a program
* using that PID for PES (it's not uncommon for example for ATSC streams
* to use 0x0010 as a PES PID).
**/
static inline gboolean
mpegts_base_is_psi (MpegTSBase * base, MpegTSPacketizerPacket * packet)
{
gboolean retval = FALSE;
guint8 *data, table_id = GST_MTS_TABLE_ID_UNSET, pointer;
int i;
static const guint8 si_tables[] =
{ 0x00, 0x01, 0x02, 0x03, 0x40, 0x41, 0x42, 0x46, 0x4A,
0x4E, 0x4F, 0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59,
0x5A, 0x5B, 0x5C, 0x5D, 0x5E, 0x5F, 0x60, 0x61, 0x62, 0x63, 0x64, 0x65,
0x66, 0x67, 0x68, 0x69, 0x6A, 0x6B, 0x6C, 0x6D, 0x6E, 0x6F, 0x70, 0x71,
0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7A, 0x7E, 0x7F,
GST_MTS_TABLE_ID_UNSET
};
/* check if it is a pes pid */
if (MPEGTS_BIT_IS_SET (base->is_pes, packet->pid))
goto invalid_pid;
/* check if it part of the PIDs we know contain PSI */
if (!MPEGTS_BIT_IS_SET (base->known_psi, packet->pid))
goto invalid_pid;
if (packet->payload_unit_start_indicator) {
data = packet->data;
pointer = *data++;
data += pointer;
/* 'pointer' value may be invalid on malformed packet
* so we need to avoid out of range */
if (!(data < packet->data_end)) {
GST_WARNING_OBJECT (base,
"Section pointer value exceeds packet size: 0x%x", pointer);
return FALSE;
}
table_id = *(packet->data);
} else {
MpegTSPacketizerStream *stream = (MpegTSPacketizerStream *)
base->packetizer->streams[packet->pid];
if (stream)
table_id = stream->table_id;
}
if (G_UNLIKELY (table_id == GST_MTS_TABLE_ID_UNSET))
goto beach;
for (i = 0; si_tables[i] != GST_MTS_TABLE_ID_UNSET; i++) {
if (G_UNLIKELY (si_tables[i] == table_id)) {
retval = TRUE;
break;
}
}
beach:
GST_DEBUG_OBJECT (base, "Packet of pid 0x%04x (table_id 0x%02x) is psi: %d",
packet->pid, table_id, retval);
return retval;
invalid_pid:
GST_LOG_OBJECT (base, "Packet of pid 0x%04x doesn't belong to a SI stream",
packet->pid);
return FALSE;
}
static gboolean
mpegts_base_apply_pat (MpegTSBase * base, GstMpegTsSection * section)
@ -1071,8 +991,13 @@ mpegts_base_chain (GstPad * pad, GstObject * parent, GstBuffer * buf)
goto next;
}
/* base PSI data */
if (packet.payload != NULL && mpegts_base_is_psi (base, &packet)) {
/* If it's a known PES, push it */
if (MPEGTS_BIT_IS_SET (base->is_pes, packet.pid)) {
/* push the packet downstream */
res = klass->push (base, &packet, NULL);
} else if (packet.payload
&& MPEGTS_BIT_IS_SET (base->known_psi, packet.pid)) {
/* base PSI data */
GstMpegTsSection *section;
section = mpegts_packetizer_push_section (packetizer, &packet);
@ -1082,10 +1007,8 @@ mpegts_base_chain (GstPad * pad, GstObject * parent, GstBuffer * buf)
/* we need to push section packet downstream */
res = klass->push (base, &packet, section);
} else if (MPEGTS_BIT_IS_SET (base->is_pes, packet.pid)) {
/* push the packet downstream */
res = klass->push (base, &packet, NULL);
}
} else if (packet.payload && packet.pid != 0x1fff)
GST_LOG ("PID 0x%04x Saw packet on a pid we don't handle", packet.pid);
next:
mpegts_packetizer_clear_packet (base->packetizer, &packet);