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docs: fix API docs for gst_{adapter|byte_reader}_masked_scan_uint32

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Clarify byte reader docs a bit: offset is relative to the current
position of the reader, not to the start of the data. Also, the
examples in both the adapter docs and the byte reader docs have
the mask and pattern arguments swapped (see #587561). Spotted
by Carl-Anton Ingmarsson.
This commit is contained in:
Tim-Philipp Müller 2009-07-16 14:17:03 +01:00
parent 9459a93cb4
commit 79c8e24885
2 changed files with 20 additions and 18 deletions
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14
libs/gst/base/gstadapter.c
View file

@ -756,19 +756,19 @@ gst_adapter_prev_timestamp (GstAdapter * adapter, guint64 * distance)
* <programlisting>
* // Assume the adapter contains 0x00 0x01 0x02 ... 0xfe 0xff
*
* gst_adapter_masked_scan_uint32 (adapter, 0x00010203, 0xffffffff, 0, 256);
* gst_adapter_masked_scan_uint32 (adapter, 0xffffffff, 0x00010203, 0, 256);
* // -> returns 0
* gst_adapter_masked_scan_uint32 (adapter, 0x00010203, 0xffffffff, 1, 255);
* gst_adapter_masked_scan_uint32 (adapter, 0xffffffff, 0x00010203, 1, 255);
* // -> returns -1
* gst_adapter_masked_scan_uint32 (adapter, 0x01020304, 0xffffffff, 1, 255);
* gst_adapter_masked_scan_uint32 (adapter, 0xffffffff, 0x01020304, 1, 255);
* // -> returns 1
* gst_adapter_masked_scan_uint32 (adapter, 0x0001, 0xffff, 0, 256);
* gst_adapter_masked_scan_uint32 (adapter, 0xffff, 0x0001, 0, 256);
* // -> returns -1
* gst_adapter_masked_scan_uint32 (adapter, 0x0203, 0xffff, 0, 256);
* gst_adapter_masked_scan_uint32 (adapter, 0xffff, 0x0203, 0, 256);
* // -> returns 0
* gst_adapter_masked_scan_uint32 (adapter, 0x02030000, 0xffff0000, 0, 256);
* gst_adapter_masked_scan_uint32 (adapter, 0xffff0000, 0x02030000, 0, 256);
* // -> returns 2
* gst_adapter_masked_scan_uint32 (adapter, 0x02030000, 0xffff0000, 0, 4);
* gst_adapter_masked_scan_uint32 (adapter, 0xffff0000, 0x02030000, 0, 4);
* // -> returns -1
* </programlisting>
*

24
libs/gst/base/gstbytereader.c
View file

@ -1239,15 +1239,17 @@ gst_byte_reader_dup_data (GstByteReader * reader, guint size, guint8 ** val)
* @reader: a #GstByteReader
* @mask: mask to apply to data before matching against @pattern
* @pattern: pattern to match (after mask is applied)
* @offset: offset into the adapter data from which to start scanning
* @offset: offset from which to start scanning, relative to the current
* position
* @size: number of bytes to scan from offset
*
* Scan for pattern @pattern with applied mask @mask in the adapter data,
* starting from offset @offset.
* Scan for pattern @pattern with applied mask @mask in the byte reader data,
* starting from offset @offset relative to the current position.
*
* The bytes in @pattern and @mask are interpreted left-to-right, regardless
* of endianness. All four bytes of the pattern must be present in the
* adapter for it to match, even if the first or last bytes are masked out.
* byte reader data for it to match, even if the first or last bytes are masked
* out.
*
* It is an error to call this function without making sure that there is
* enough data (offset+size bytes) in the byte reader.
@ -1258,19 +1260,19 @@ gst_byte_reader_dup_data (GstByteReader * reader, guint size, guint8 ** val)
* <programlisting>
* // Assume the reader contains 0x00 0x01 0x02 ... 0xfe 0xff
*
* gst_byte_reader_masked_scan_uint32 (reader, 0x00010203, 0xffffffff, 0, 256);
* gst_byte_reader_masked_scan_uint32 (reader, 0xffffffff, 0x00010203, 0, 256);
* // -> returns 0
* gst_byte_reader_masked_scan_uint32 (reader, 0x00010203, 0xffffffff, 1, 255);
* gst_byte_reader_masked_scan_uint32 (reader, 0xffffffff, 0x00010203, 1, 255);
* // -> returns -1
* gst_byte_reader_masked_scan_uint32 (reader, 0x01020304, 0xffffffff, 1, 255);
* gst_byte_reader_masked_scan_uint32 (reader, 0xffffffff, 0x01020304, 1, 255);
* // -> returns 1
* gst_byte_reader_masked_scan_uint32 (reader, 0x0001, 0xffff, 0, 256);
* gst_byte_reader_masked_scan_uint32 (reader, 0xffff, 0x0001, 0, 256);
* // -> returns -1
* gst_byte_reader_masked_scan_uint32 (reader, 0x0203, 0xffff, 0, 256);
* gst_byte_reader_masked_scan_uint32 (reader, 0xffff, 0x0203, 0, 256);
* // -> returns 0
* gst_byte_reader_masked_scan_uint32 (reader, 0x02030000, 0xffff0000, 0, 256);
* gst_byte_reader_masked_scan_uint32 (reader, 0xffff0000, 0x02030000, 0, 256);
* // -> returns 2
* gst_byte_reader_masked_scan_uint32 (reader, 0x02030000, 0xffff0000, 0, 4);
* gst_byte_reader_masked_scan_uint32 (reader, 0xffff0000, 0x02030000, 0, 4);
* // -> returns -1
* </programlisting>
*