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mpegtspacketizer: Additionally use the CRC to check if tables are duplicates

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The current code just uses table id, subtable extension and version number to
check if the section has been seen before. However, this comparison is not
sufficient, causing actually new tables being dismissed.

Fixes bug #614479.
This commit is contained in:
Sebastian Pölsterl 2010-04-02 19:52:25 +02:00 committed by Sebastian Dröge
parent c55b24b43d
commit d7ab75abb8
2 changed files with 16 additions and 4 deletions
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18
gst/mpegdemux/mpegtspacketizer.c
View file

@ -103,6 +103,7 @@ mpegts_packetizer_stream_subtable_new (guint8 table_id,
subtable->version_number = VERSION_NUMBER_UNSET;
subtable->table_id = table_id;
subtable->subtable_extension = subtable_extension;
subtable->crc = 0;
return subtable;
}
@ -264,7 +265,7 @@ mpegts_packetizer_parse_section_header (MpegTSPacketizer * packetizer,
MpegTSPacketizerStream * stream, MpegTSPacketizerSection * section)
{
guint8 tmp;
guint8 *data;
guint8 *data, *crc_data;
MpegTSPacketizerStreamSubtable *subtable;
GSList *subtable_list = NULL;
@ -302,21 +303,30 @@ mpegts_packetizer_parse_section_header (MpegTSPacketizer * packetizer,
tmp = *data++;
section->version_number = (tmp >> 1) & 0x1F;
section->current_next_indicator = tmp & 0x01;
if (!section->current_next_indicator)
goto not_applicable;
if (section->version_number == subtable->version_number)
/* 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",
("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->current_next_indicator, section->version_number, section->crc);
section->complete = FALSE;
gst_buffer_unref (section->buffer);
return TRUE;

2
gst/mpegdemux/mpegtspacketizer.h
View file

@ -103,6 +103,7 @@ typedef struct
guint section_length;
guint8 version_number;
guint8 current_next_indicator;
guint32 crc;
} MpegTSPacketizerSection;
typedef struct
@ -113,6 +114,7 @@ typedef struct
* section_syntax_indicator is 0, sub_table_extension will be set to 0 */
guint16 subtable_extension;
guint8 version_number;
guint32 crc;
} MpegTSPacketizerStreamSubtable;
typedef enum {