Commit 02a01394 authored by Olivier Crête's avatar Olivier Crête 👻 Committed by Wim Taymans
Browse files

rtpbuffer: Add function to append RFC 5285 one byte header extensions

parent e4c06deb
......@@ -1359,6 +1359,8 @@ gst_rtp_buffer_list_set_timestamp
gst_rtp_buffer_get_extension_onebyte_header
gst_rtp_buffer_get_extension_twobytes_header
gst_rtp_buffer_add_extension_twobytes_header
</SECTION>
# rtsp
......
......@@ -1542,3 +1542,112 @@ gst_rtp_buffer_get_extension_twobytes_header (GstBuffer * buffer,
return FALSE;
}
/**
* gst_rtp_buffer_add_extension_onebyte_header:
* @buffer: the buffer
* @id: The ID of the header extension (between 1 and 14).
* @data: location for data
* @size: the size of the data in bytes
*
* Adds a RFC 5285 header extension with a one byte header to the end of the
* RTP header. If there is already a RFC 5285 header extension with a one byte
* header, the new extension will be appended.
* It will not work if there is already a header extension that does not follow
* the mecanism described in RFC 5285 or if there is a header extension with
* a two bytes header as described in RFC 5285. In that case, use
* gst_rtp_buffer_add_extension_twobytes_header()
*
* Returns: %TRUE if header extension could be added
*
* Since: 0.10.31
*/
gboolean
gst_rtp_buffer_add_extension_onebyte_header (GstBuffer * buffer, guint8 id,
gpointer data, guint size)
{
guint16 bits;
guint8 *pdata;
guint wordlen;
gboolean has_bit;
guint bytelen;
g_return_val_if_fail (id > 0 && id < 15, FALSE);
g_return_val_if_fail (size >= 1 && size <= 16, FALSE);
g_return_val_if_fail (gst_buffer_is_writable (buffer), FALSE);
has_bit = gst_rtp_buffer_get_extension_data (buffer, &bits,
(gpointer) & pdata, &wordlen);
bytelen = wordlen * 4;
if (has_bit) {
gulong offset = 0;
guint8 *nextext;
guint extlen;
if (bits != 0xBEDE)
return FALSE;
while (offset + 1 < bytelen) {
guint8 read_id, read_len;
read_id = GST_READ_UINT8 (pdata + offset) >> 4;
read_len = (GST_READ_UINT8 (pdata + offset) & 0x0F) + 1;
offset += 1;
/* ID 0 means its padding, skip */
if (read_id == 0)
continue;
/* ID 15 is special and means we should stop parsing */
/* It also means we can't add an extra packet */
if (read_id == 15)
return FALSE;
/* Ignore extension headers where the size does not fit */
if (offset + read_len > bytelen)
return FALSE;
offset += read_len;
}
nextext = pdata + offset;
offset = nextext - GST_BUFFER_DATA (buffer);
/* Don't add extra header if there isn't enough space */
if (GST_BUFFER_SIZE (buffer) < offset + size + 1)
return FALSE;
nextext[0] = (id << 4) | (0x0F & (size - 1));
memcpy (nextext + 1, data, size);
extlen = nextext - pdata + size + 1;
if (extlen % 4) {
wordlen = extlen / 4 + 1;
memset (nextext + size + 1, 0, 4 - extlen % 4);
} else {
wordlen = extlen / 4;
}
gst_rtp_buffer_set_extension_data (buffer, 0xBEDE, wordlen);
} else {
wordlen = (size + 1) / 4 + (((size + 1) % 4) ? 1 : 0);
gst_rtp_buffer_set_extension_data (buffer, 0xBEDE, wordlen);
gst_rtp_buffer_get_extension_data (buffer, &bits,
(gpointer) & pdata, &wordlen);
pdata[0] = (id << 4) | (0x0F & (size - 1));
memcpy (pdata + 1, data, size);
if ((size + 1) % 4)
memset (pdata + size + 1, 0, 4 - ((size + 1) % 4));
}
return TRUE;
}
......@@ -122,6 +122,10 @@ gboolean gst_rtp_buffer_get_extension_twobytes_header (GstBuffer * buffer
gpointer * data,
guint * size);
gboolean gst_rtp_buffer_add_extension_onebyte_header (GstBuffer * buffer,
guint8 id,
gpointer data,
guint size);
G_END_DECLS
......
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