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sdp: add helper fuctions from/to sdp from/to caps

Browse source 
<gstsdpmessage.h>
GstCaps*       gst_sdp_media_get_caps_from_media   (const GstSDPMedia *media, gint pt);
GstSDPResult   gst_sdp_media_set_media_from_caps   (const GstCaps* caps, GstSDPMedia *media);
gchar *        gst_sdp_make_keymgmt                (const gchar *uri, const gchar *base64);
GstSDPResult   gst_sdp_message_attributes_to_caps  (GstSDPMessage *msg, GstCaps *caps);
GstSDPResult   gst_sdp_media_attributes_to_caps    (GstSDPMedia *media, GstCaps *caps);

<gstmikey.h>
GstMIKEYMessage * gst_mikey_message_new_from_caps  (GstCaps *caps);
gchar *           gst_mikey_message_base64_encode  (GstMIKEYMessage* msg);

https://bugzilla.gnome.org/show_bug.cgi?id=745880
This commit is contained in:
Hyunjun Ko 2015-10-07 18:50:18 +09:00 committed by Sebastian Dröge
parent eb09889176
commit 682b523652
8 changed files with 995 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

7
docs/libs/gst-plugins-base-libs-sections.txt
View file

@ -1793,6 +1793,11 @@ gst_sdp_media_insert_attribute
gst_sdp_media_replace_attribute
gst_sdp_media_remove_attribute
gst_sdp_media_add_attribute
gst_sdp_media_get_caps_from_media
gst_sdp_media_set_media_from_caps
gst_sdp_make_keymgmt
gst_sdp_message_attributes_to_caps
gst_sdp_media_attributes_to_caps
<SUBSECTION Standard>
gst_sdp_message_get_type
</SECTION>
@ -1807,8 +1812,10 @@ GstMIKEYMessage
gst_mikey_message_new
gst_mikey_message_new_from_bytes
gst_mikey_message_new_from_caps
gst_mikey_message_new_from_data
gst_mikey_message_to_bytes
gst_mikey_message_base64_encode
gst_mikey_message_copy
gst_mikey_message_ref
gst_mikey_message_unref

2
gst-libs/gst/sdp/Makefile.am
View file

@ -10,7 +10,7 @@ lib_LTLIBRARIES = libgstsdp-@GST_API_VERSION@.la
libgstsdp_@GST_API_VERSION@_la_SOURCES = gstsdpmessage.c gstmikey.c
libgstsdp_@GST_API_VERSION@_la_CFLAGS = $(GST_PLUGINS_BASE_CFLAGS) $(GST_BASE_CFLAGS) $(GST_CFLAGS) $(GIO_CFLAGS)
libgstsdp_@GST_API_VERSION@_la_LIBADD = $(GST_LIBS) $(GIO_LIBS)
libgstsdp_@GST_API_VERSION@_la_LIBADD = $(top_builddir)/gst-libs/gst/rtp/libgstrtp-@GST_API_VERSION@.la $(GST_LIBS) $(GIO_LIBS)
libgstsdp_@GST_API_VERSION@_la_LDFLAGS = $(GST_LIB_LDFLAGS) $(GST_ALL_LDFLAGS) $(GST_LT_LDFLAGS)
if HAVE_INTROSPECTION

167
gst-libs/gst/sdp/gstmikey.c
View file

@ -2148,3 +2148,170 @@ parse_error:
return NULL;
}
}
#define AES_128_KEY_LEN 16
#define AES_256_KEY_LEN 32
#define HMAC_32_KEY_LEN 4
#define HMAC_80_KEY_LEN 10
static guint8
enc_key_length_from_cipher_name (const gchar * cipher)
{
if (g_strcmp0 (cipher, "aes-128-icm") == 0)
return AES_128_KEY_LEN;
else if (g_strcmp0 (cipher, "aes-256-icm") == 0)
return AES_256_KEY_LEN;
else {
GST_ERROR ("encryption algorithm '%s' not supported", cipher);
return 0;
}
}
static guint8
auth_key_length_from_auth_name (const gchar * auth)
{
if (g_strcmp0 (auth, "hmac-sha1-32") == 0)
return HMAC_32_KEY_LEN;
else if (g_strcmp0 (auth, "hmac-sha1-80") == 0)
return HMAC_80_KEY_LEN;
else {
GST_ERROR ("authentication algorithm '%s' not supported", auth);
return 0;
}
}
/**
* gst_mikey_message_new_from_caps:
* @caps: a #GstCaps, including SRTP parameters (srtp/srtcp cipher, authorization, key data)
*
* Makes mikey message including:
* - Security Policy Payload
* - Key Data Transport Payload
* - Key Data Sub-Payload
*
* Returns: (transfer full): a #GstMIKEYMessage,
* or %NULL if there is no srtp information in the caps.
*
* Since: 1.8
*/
GstMIKEYMessage *
gst_mikey_message_new_from_caps (GstCaps * caps)
{
GstMIKEYMessage *msg;
GstMIKEYPayload *payload, *pkd;
guint8 byte;
GstStructure *s;
GstMapInfo info;
GstBuffer *srtpkey;
const GValue *val;
const gchar *srtpcipher, *srtpauth, *srtcpcipher, *srtcpauth;
g_return_val_if_fail (caps != NULL && GST_IS_CAPS (caps), NULL);
s = gst_caps_get_structure (caps, 0);
g_return_val_if_fail (s != NULL, NULL);
val = gst_structure_get_value (s, "srtp-key");
if (!val)
goto no_key;
srtpkey = gst_value_get_buffer (val);
if (!srtpkey || !GST_IS_BUFFER (srtpkey))
goto no_key;
srtpcipher = gst_structure_get_string (s, "srtp-cipher");
srtpauth = gst_structure_get_string (s, "srtp-auth");
srtcpcipher = gst_structure_get_string (s, "srtcp-cipher");
srtcpauth = gst_structure_get_string (s, "srtcp-auth");
if (srtpcipher == NULL || srtpauth == NULL || srtcpcipher == NULL ||
srtcpauth == NULL) {
GST_WARNING ("could not find the right SRTP parameters in caps");
return NULL;
}
msg = gst_mikey_message_new ();
/* unencrypted MIKEY message, we send this over TLS so this is allowed */
gst_mikey_message_set_info (msg, GST_MIKEY_VERSION, GST_MIKEY_TYPE_PSK_INIT,
FALSE, GST_MIKEY_PRF_MIKEY_1, g_random_int (), GST_MIKEY_MAP_TYPE_SRTP);
/* timestamp is now */
gst_mikey_message_add_t_now_ntp_utc (msg);
/* add some random data */
gst_mikey_message_add_rand_len (msg, 16);
/* the policy '0' is SRTP */
payload = gst_mikey_payload_new (GST_MIKEY_PT_SP);
gst_mikey_payload_sp_set (payload, 0, GST_MIKEY_SEC_PROTO_SRTP);
/* only AES-CM is supported */
byte = 1;
gst_mikey_payload_sp_add_param (payload, GST_MIKEY_SP_SRTP_ENC_ALG, 1, &byte);
/* encryption key length */
byte = enc_key_length_from_cipher_name (srtpcipher);
gst_mikey_payload_sp_add_param (payload, GST_MIKEY_SP_SRTP_ENC_KEY_LEN, 1,
&byte);
/* only HMAC-SHA1 */
gst_mikey_payload_sp_add_param (payload, GST_MIKEY_SP_SRTP_AUTH_ALG, 1,
&byte);
/* authentication key length */
byte = auth_key_length_from_auth_name (srtpauth);
gst_mikey_payload_sp_add_param (payload, GST_MIKEY_SP_SRTP_AUTH_KEY_LEN, 1,
&byte);
/* we enable encryption on RTP and RTCP */
gst_mikey_payload_sp_add_param (payload, GST_MIKEY_SP_SRTP_SRTP_ENC, 1,
&byte);
gst_mikey_payload_sp_add_param (payload, GST_MIKEY_SP_SRTP_SRTCP_ENC, 1,
&byte);
/* we enable authentication on RTP and RTCP */
gst_mikey_payload_sp_add_param (payload, GST_MIKEY_SP_SRTP_SRTP_AUTH, 1,
&byte);
gst_mikey_message_add_payload (msg, payload);
/* make unencrypted KEMAC */
payload = gst_mikey_payload_new (GST_MIKEY_PT_KEMAC);
gst_mikey_payload_kemac_set (payload, GST_MIKEY_ENC_NULL, GST_MIKEY_MAC_NULL);
/* add the key in KEMAC */
pkd = gst_mikey_payload_new (GST_MIKEY_PT_KEY_DATA);
gst_buffer_map (srtpkey, &info, GST_MAP_READ);
gst_mikey_payload_key_data_set_key (pkd, GST_MIKEY_KD_TEK, info.size,
info.data);
gst_buffer_unmap (srtpkey, &info);
gst_mikey_payload_kemac_add_sub (payload, pkd);
gst_mikey_message_add_payload (msg, payload);
return msg;
no_key:
GST_INFO ("No srtp key");
return NULL;
}
/**
* gst_mikey_message_base64_encode:
* @msg: a #GstMIKEYMessage
*
* Returns: (transfer full): a #gchar, base64-encoded data
*
* Since: 1.8
*/
gchar *
gst_mikey_message_base64_encode (GstMIKEYMessage * msg)
{
GBytes *bytes;
gchar *base64;
const guint8 *data;
gsize size;
g_return_val_if_fail (msg != NULL, NULL);
/* serialize mikey message to bytes */
bytes = gst_mikey_message_to_bytes (msg, NULL, NULL);
/* and make it into base64 */
data = g_bytes_get_data (bytes, &size);
base64 = g_base64_encode (data, size);
g_bytes_unref (bytes);
return base64;
}

3
gst-libs/gst/sdp/gstmikey.h
View file

@ -559,6 +559,9 @@ GstMIKEYMessage * gst_mikey_message_new_from_bytes (GBytes *bytes,
GError **error);
GBytes * gst_mikey_message_to_bytes (GstMIKEYMessage *msg, GstMIKEYEncryptInfo *info,
GError **error);
GstMIKEYMessage * gst_mikey_message_new_from_caps (GstCaps *caps);
gchar * gst_mikey_message_base64_encode (GstMIKEYMessage* msg);
/**
* gst_mikey_message_ref:
* @message: The message to refcount

701
gst-libs/gst/sdp/gstsdpmessage.c
View file

@ -56,12 +56,15 @@
#include "config.h"
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <gio/gio.h>
#include <gst/rtp/gstrtppayloads.h>
#include "gstsdpmessage.h"
#include "gstmikey.h"
#define FREE_STRING(field) g_free (field); (field) = NULL
#define REPLACE_STRING(field, val) FREE_STRING(field); (field) = g_strdup (val)
@ -2802,7 +2805,7 @@ gst_sdp_parse_line (SDPContext * c, gchar type, gchar * buffer)
switch (type) {
case 'v':
if (buffer[0] != '0')
g_warning ("wrong SDP version");
GST_WARNING ("wrong SDP version");
gst_sdp_message_set_version (c->msg, buffer);
break;
case 'o':
@ -3165,3 +3168,699 @@ gst_sdp_message_dump (const GstSDPMessage * msg)
}
return GST_SDP_OK;
}
static const gchar *
gst_sdp_get_attribute_for_pt (const GstSDPMedia * media, const gchar * name,
gint pt)
{
guint i;
for (i = 0;; i++) {
const gchar *attr;
gint val;
if ((attr = gst_sdp_media_get_attribute_val_n (media, name, i)) == NULL)
break;
if (sscanf (attr, "%d ", &val) != 1)
continue;
if (val == pt)
return attr;
}
return NULL;
}
#define PARSE_INT(p, del, res) \
G_STMT_START { \
gchar *t = p; \
p = strstr (p, del); \
if (p == NULL) \
res = -1; \
else { \
*p = '\0'; \
p++; \
res = atoi (t); \
} \
} G_STMT_END
#define PARSE_STRING(p, del, res) \
G_STMT_START { \
gchar *t = p; \
p = strstr (p, del); \
if (p == NULL) { \
res = NULL; \
p = t; \
} \
else { \
*p = '\0'; \
p++; \
res = t; \
} \
} G_STMT_END
#define SKIP_SPACES(p) \
while (*p && g_ascii_isspace (*p)) \
p++;
/* rtpmap contains:
*
* <payload> <encoding_name>/<clock_rate>[/<encoding_params>]
*/
static gboolean
gst_sdp_parse_rtpmap (const gchar * rtpmap, gint * payload, gchar ** name,
gint * rate, gchar ** params)
{
gchar *p, *t;
p = (gchar *) rtpmap;
PARSE_INT (p, " ", *payload);
if (*payload == -1)
return FALSE;
SKIP_SPACES (p);
if (*p == '\0')
return FALSE;
PARSE_STRING (p, "/", *name);
if (*name == NULL) {
GST_DEBUG ("no rate, name %s", p);
/* no rate, assume -1 then, this is not supposed to happen but RealMedia
* streams seem to omit the rate. */
*name = p;
*rate = -1;
return TRUE;
}
t = p;
p = strstr (p, "/");
if (p == NULL) {
*rate = atoi (t);
return TRUE;
}
*p = '\0';
p++;
*rate = atoi (t);
t = p;
if (*p == '\0')
return TRUE;
*params = t;
return TRUE;
}
/**
* gst_sdp_media_get_caps_from_media:
* @media: a #GstSDPMedia
* @pt: a payload type
*
* Mapping of caps from SDP fields:
*
* a=rtpmap:(payload) (encoding_name)/(clock_rate)[/(encoding_params)]
*
* a=framesize:(payload) (width)-(height)
*
* a=fmtp:(payload) (param)[=(value)];...
*
* Returns: a #GstCaps, or %NULL if an error happened
*
* Since: 1.8
*/
GstCaps *
gst_sdp_media_get_caps_from_media (const GstSDPMedia * media, gint pt)
{
GstCaps *caps;
const gchar *rtpmap;
const gchar *fmtp;
const gchar *framesize;
gchar *name = NULL;
gint rate = -1;
gchar *params = NULL;
gchar *tmp;
GstStructure *s;
gint payload = 0;
gboolean ret;
/* get and parse rtpmap */
rtpmap = gst_sdp_get_attribute_for_pt (media, "rtpmap", pt);
if (rtpmap) {
ret = gst_sdp_parse_rtpmap (rtpmap, &payload, &name, &rate, &params);
if (!ret) {
GST_ERROR ("error parsing rtpmap, ignoring");
rtpmap = NULL;
}
}
/* dynamic payloads need rtpmap or we fail */
if (rtpmap == NULL && pt >= 96)
goto no_rtpmap;
/* check if we have a rate, if not, we need to look up the rate from the
* default rates based on the payload types. */
if (rate == -1) {
const GstRTPPayloadInfo *info;
if (GST_RTP_PAYLOAD_IS_DYNAMIC (pt)) {
/* dynamic types, use media and encoding_name */
tmp = g_ascii_strdown (media->media, -1);
info = gst_rtp_payload_info_for_name (tmp, name);
g_free (tmp);
} else {
/* static types, use payload type */
info = gst_rtp_payload_info_for_pt (pt);
}
if (info) {
if ((rate = info->clock_rate) == 0)
rate = -1;
}
/* we fail if we cannot find one */
if (rate == -1)
goto no_rate;
}
tmp = g_ascii_strdown (media->media, -1);
caps = gst_caps_new_simple ("application/x-unknown",
"media", G_TYPE_STRING, tmp, "payload", G_TYPE_INT, pt, NULL);
g_free (tmp);
s = gst_caps_get_structure (caps, 0);
gst_structure_set (s, "clock-rate", G_TYPE_INT, rate, NULL);
/* encoding name must be upper case */
if (name != NULL) {
tmp = g_ascii_strup (name, -1);
gst_structure_set (s, "encoding-name", G_TYPE_STRING, tmp, NULL);
g_free (tmp);
}
/* params must be lower case */
if (params != NULL) {
tmp = g_ascii_strdown (params, -1);
gst_structure_set (s, "encoding-params", G_TYPE_STRING, tmp, NULL);
g_free (tmp);
}
/* parse optional fmtp: field */
if ((fmtp = gst_sdp_get_attribute_for_pt (media, "fmtp", pt))) {
gchar *p;
gint payload = 0;
p = (gchar *) fmtp;
/* p is now of the format <payload> <param>[=<value>];... */
PARSE_INT (p, " ", payload);
if (payload != -1 && payload == pt) {
gchar **pairs;
gint i;
/* <param>[=<value>] are separated with ';' */
pairs = g_strsplit (p, ";", 0);
for (i = 0; pairs[i]; i++) {
gchar *valpos;
const gchar *val, *key;
gint j;
const gchar *reserved_keys[] =
{ "media", "payload", "clock-rate", "encoding-name",
"encoding-params"
};
/* the key may not have a '=', the value can have other '='s */
valpos = strstr (pairs[i], "=");
if (valpos) {
/* we have a '=' and thus a value, remove the '=' with \0 */
*valpos = '\0';
/* value is everything between '=' and ';'. We split the pairs at ;
* boundaries so we can take the remainder of the value. Some servers
* put spaces around the value which we strip off here. Alternatively
* we could strip those spaces in the depayloaders should these spaces
* actually carry any meaning in the future. */
val = g_strstrip (valpos + 1);
} else {
/* simple <param>;.. is translated into <param>=1;... */
val = "1";
}
/* strip the key of spaces, convert key to lowercase but not the value. */
key = g_strstrip (pairs[i]);
/* skip keys from the fmtp, which we already use ourselves for the
* caps. Some software is adding random things like clock-rate into
* the fmtp, and we would otherwise here set a string-typed clock-rate
* in the caps... and thus fail to create valid RTP caps
*/
for (j = 0; j < G_N_ELEMENTS (reserved_keys); j++) {
if (g_ascii_strcasecmp (reserved_keys[j], key) == 0) {
key = "";
break;
}
}
if (strlen (key) > 1) {
tmp = g_ascii_strdown (key, -1);
gst_structure_set (s, tmp, G_TYPE_STRING, val, NULL);
g_free (tmp);
}
}
g_strfreev (pairs);
}
}
/* parse framesize: field */
if ((framesize = gst_sdp_media_get_attribute_val (media, "framesize"))) {
gchar *p;
/* p is now of the format <payload> <width>-<height> */
p = (gchar *) framesize;
PARSE_INT (p, " ", payload);
if (payload != -1 && payload == pt) {
gst_structure_set (s, "a-framesize", G_TYPE_STRING, p, NULL);
}
}
return caps;
/* ERRORS */
no_rtpmap:
{
GST_ERROR ("rtpmap type not given for dynamic payload %d", pt);
return NULL;
}
no_rate:
{
GST_ERROR ("rate unknown for payload type %d", pt);
return NULL;
}
}
/**
* gst_sdp_media_set_media_from_caps:
* @caps: a #GstCaps
* @media: a #GstSDPMedia
*
* Mapping of caps to SDP fields:
*
* a=rtpmap:(payload) (encoding_name) or (clock_rate)[or (encoding_params)]
*
* a=framesize:(payload) (width)-(height)
*
* a=fmtp:(payload) (param)[=(value)];...
*
* Returns: a #GstSDPResult.
*
* Since: 1.8
*/
GstSDPResult
gst_sdp_media_set_media_from_caps (const GstCaps * caps, GstSDPMedia * media)
{
const gchar *caps_str, *caps_enc, *caps_params;
gchar *tmp;
gint caps_pt, caps_rate;
guint n_fields, j;
gboolean first;
GString *fmtp;
GstStructure *s;
g_return_val_if_fail (media != NULL, GST_SDP_EINVAL);
g_return_val_if_fail (caps != NULL && GST_IS_CAPS (caps), GST_SDP_EINVAL);
s = gst_caps_get_structure (caps, 0);
if (s == NULL) {
GST_ERROR ("ignoring stream without media type");
goto error;
}
/* get media type and payload for the m= line */
caps_str = gst_structure_get_string (s, "media");
gst_sdp_media_set_media (media, caps_str);
gst_structure_get_int (s, "payload", &caps_pt);
tmp = g_strdup_printf ("%d", caps_pt);
gst_sdp_media_add_format (media, tmp);
g_free (tmp);
/* get clock-rate, media type and params for the rtpmap attribute */
gst_structure_get_int (s, "clock-rate", &caps_rate);
caps_enc = gst_structure_get_string (s, "encoding-name");
caps_params = gst_structure_get_string (s, "encoding-params");
if (caps_enc) {
if (caps_params)
tmp = g_strdup_printf ("%d %s/%d/%s", caps_pt, caps_enc, caps_rate,
caps_params);
else
tmp = g_strdup_printf ("%d %s/%d", caps_pt, caps_enc, caps_rate);
gst_sdp_media_add_attribute (media, "rtpmap", tmp);
g_free (tmp);
}
/* collect all other properties and add them to fmtp or attributes */
fmtp = g_string_new ("");
g_string_append_printf (fmtp, "%d ", caps_pt);
first = TRUE;
n_fields = gst_structure_n_fields (s);
for (j = 0; j < n_fields; j++) {
const gchar *fname, *fval;
fname = gst_structure_nth_field_name (s, j);
/* filter out standard properties */
if (!strcmp (fname, "media"))
continue;
if (!strcmp (fname, "payload"))
continue;
if (!strcmp (fname, "clock-rate"))
continue;
if (!strcmp (fname, "encoding-name"))
continue;
if (!strcmp (fname, "encoding-params"))
continue;
if (!strcmp (fname, "ssrc"))
continue;
if (!strcmp (fname, "timestamp-offset"))
continue;
if (!strcmp (fname, "seqnum-offset"))
continue;
if (g_str_has_prefix (fname, "srtp-"))
continue;
if (g_str_has_prefix (fname, "srtcp-"))
continue;
/* handled later */
if (g_str_has_prefix (fname, "x-gst-rtsp-server-rtx-time"))
continue;
if (!strcmp (fname, "a-framesize")) {
/* a-framesize attribute */
if ((fval = gst_structure_get_string (s, fname))) {
tmp = g_strdup_printf ("%d %s", caps_pt, fval);
gst_sdp_media_add_attribute (media, fname + 2, tmp);
g_free (tmp);
}
continue;
}
if (g_str_has_prefix (fname, "a-")) {
/* attribute */
if ((fval = gst_structure_get_string (s, fname)))
gst_sdp_media_add_attribute (media, fname + 2, fval);
continue;
}
if (g_str_has_prefix (fname, "x-")) {
/* attribute */
if ((fval = gst_structure_get_string (s, fname)))
gst_sdp_media_add_attribute (media, fname, fval);
continue;
}
if ((fval = gst_structure_get_string (s, fname))) {
g_string_append_printf (fmtp, "%s%s=%s", first ? "" : ";", fname, fval);
first = FALSE;
}
}
if (!first) {
tmp = g_string_free (fmtp, FALSE);
gst_sdp_media_add_attribute (media, "fmtp", tmp);
g_free (tmp);
} else {
g_string_free (fmtp, TRUE);
}
return GST_SDP_OK;
/* ERRORS */
error:
{
GST_DEBUG ("ignoring stream");
return GST_SDP_EINVAL;
}
}
/**
* gst_sdp_make_keymgmt:
* @uri: a #gchar URI
* @base64: a #gchar base64-encoded key data
*
* Makes key management data
*
* Returns: (transfer full): a #gchar key-mgmt data,
*
* Since: 1.8
*/
gchar *
gst_sdp_make_keymgmt (const gchar * uri, const gchar * base64)
{
g_return_val_if_fail (uri != NULL, NULL);
g_return_val_if_fail (base64 != NULL, NULL);
return g_strdup_printf ("prot=mikey;uri=\"%s\";data=\"%s\"", uri, base64);
}
#define AES_128_KEY_LEN 16
#define AES_256_KEY_LEN 32
#define HMAC_32_KEY_LEN 4
#define HMAC_80_KEY_LEN 10
static gboolean
gst_sdp_parse_keymgmt (const gchar * keymgmt, GstCaps * caps)
{
gboolean res = FALSE;
gsize size;
guchar *data;
GstMIKEYMessage *msg;
const GstMIKEYPayload *payload;
const gchar *srtp_cipher;
const gchar *srtp_auth;
gchar *orig_value;
gchar *p, *kmpid;
p = orig_value = g_strdup (keymgmt);
SKIP_SPACES (p);
if (*p == '\0') {
g_free (orig_value);
return FALSE;
}
PARSE_STRING (p, " ", kmpid);
if (kmpid == NULL || !g_str_equal (kmpid, "mikey")) {
g_free (orig_value);
return FALSE;
}
data = g_base64_decode (p, &size);
g_free (orig_value); /* Don't need this any more */
if (data == NULL)
return FALSE;
msg = gst_mikey_message_new_from_data (data, size, NULL, NULL);
g_free (data);
if (msg == NULL)
return FALSE;
srtp_cipher = "aes-128-icm";
srtp_auth = "hmac-sha1-80";
/* check the Security policy if any */
if ((payload = gst_mikey_message_find_payload (msg, GST_MIKEY_PT_SP, 0))) {
GstMIKEYPayloadSP *p = (GstMIKEYPayloadSP *) payload;
guint len, i;
if (p->proto != GST_MIKEY_SEC_PROTO_SRTP)
goto done;
len = gst_mikey_payload_sp_get_n_params (payload);
for (i = 0; i < len; i++) {
const GstMIKEYPayloadSPParam *param =
gst_mikey_payload_sp_get_param (payload, i);
switch (param->type) {
case GST_MIKEY_SP_SRTP_ENC_ALG:
switch (param->val[0]) {
case 0:
srtp_cipher = "null";
break;
case 2:
case 1:
srtp_cipher = "aes-128-icm";
break;
default:
break;
}
break;
case GST_MIKEY_SP_SRTP_ENC_KEY_LEN:
switch (param->val[0]) {
case AES_128_KEY_LEN:
srtp_cipher = "aes-128-icm";
break;
case AES_256_KEY_LEN:
srtp_cipher = "aes-256-icm";
break;
default:
break;
}
break;
case GST_MIKEY_SP_SRTP_AUTH_ALG:
switch (param->val[0]) {
case 0:
srtp_auth = "null";
break;
case 2:
case 1:
srtp_auth = "hmac-sha1-80";
break;
default:
break;
}
break;
case GST_MIKEY_SP_SRTP_AUTH_KEY_LEN:
switch (param->val[0]) {
case HMAC_32_KEY_LEN:
srtp_auth = "hmac-sha1-32";
break;
case HMAC_80_KEY_LEN:
srtp_auth = "hmac-sha1-80";
break;
default:
break;
}
break;
case GST_MIKEY_SP_SRTP_SRTP_ENC:
break;
case GST_MIKEY_SP_SRTP_SRTCP_ENC:
break;
default:
break;
}
}
}
if (!(payload = gst_mikey_message_find_payload (msg, GST_MIKEY_PT_KEMAC, 0)))
goto done;
else {
GstMIKEYPayloadKEMAC *p = (GstMIKEYPayloadKEMAC *) payload;
const GstMIKEYPayload *sub;
GstMIKEYPayloadKeyData *pkd;
GstBuffer *buf;
if (p->enc_alg != GST_MIKEY_ENC_NULL || p->mac_alg != GST_MIKEY_MAC_NULL)
goto done;
if (!(sub = gst_mikey_payload_kemac_get_sub (payload, 0)))
goto done;
if (sub->type != GST_MIKEY_PT_KEY_DATA)
goto done;
pkd = (GstMIKEYPayloadKeyData *) sub;
buf =
gst_buffer_new_wrapped (g_memdup (pkd->key_data, pkd->key_len),
pkd->key_len);
gst_caps_set_simple (caps, "srtp-key", GST_TYPE_BUFFER, buf, NULL);
gst_buffer_unref (buf);
}
gst_caps_set_simple (caps,
"srtp-cipher", G_TYPE_STRING, srtp_cipher,
"srtp-auth", G_TYPE_STRING, srtp_auth,
"srtcp-cipher", G_TYPE_STRING, srtp_cipher,
"srtcp-auth", G_TYPE_STRING, srtp_auth, NULL);
res = TRUE;
done:
gst_mikey_message_unref (msg);
return res;
}
static GstSDPResult
sdp_addtributes_to_caps (GArray * attributes, GstCaps * caps)
{
if (attributes->len > 0) {
GstStructure *s;
guint i;
s = gst_caps_get_structure (caps, 0);
for (i = 0; i < attributes->len; i++) {
GstSDPAttribute *attr = &g_array_index (attributes, GstSDPAttribute, i);
gchar *tofree, *key;
key = attr->key;
/* skip some of the attribute we already handle */
if (!strcmp (key, "fmtp"))
continue;
if (!strcmp (key, "rtpmap"))
continue;
if (!strcmp (key, "control"))
continue;
if (!strcmp (key, "range"))
continue;
if (!strcmp (key, "framesize"))
continue;
if (g_str_equal (key, "key-mgmt")) {
gst_sdp_parse_keymgmt (attr->value, caps);
continue;
}
/* string must be valid UTF8 */
if (!g_utf8_validate (attr->value, -1, NULL))
continue;
if (!g_str_has_prefix (key, "x-"))
tofree = key = g_strdup_printf ("a-%s", key);
else
tofree = NULL;
GST_DEBUG ("adding caps: %s=%s", key, attr->value);
gst_structure_set (s, key, G_TYPE_STRING, attr->value, NULL);
g_free (tofree);
}
}
return GST_SDP_OK;
}
/**
* gst_sdp_message_attributes_to_caps:
* @msg: a #GstSDPMessage
* @caps: a #GstCaps
*
* Mapping of attributes of #GstSDPMessage to #GstCaps
*
* Returns: a #GstSDPResult.
*
* Since: 1.8
*/
GstSDPResult
gst_sdp_message_attributes_to_caps (const GstSDPMessage * msg, GstCaps * caps)
{
g_return_val_if_fail (msg != NULL, GST_SDP_EINVAL);
g_return_val_if_fail (caps != NULL && GST_IS_CAPS (caps), GST_SDP_EINVAL);
return sdp_addtributes_to_caps (msg->attributes, caps);
}
/**
* gst_sdp_media_attributes_to_caps:
* @media: a #GstSDPMedia
* @caps: a #GstCaps
*
* Mapping of attributes of #GstSDPMedia to #GstCaps
*
* Returns: a #GstSDPResult.
*
* Since: 1.8
*/
GstSDPResult
gst_sdp_media_attributes_to_caps (const GstSDPMedia * media, GstCaps * caps)
{
g_return_val_if_fail (media != NULL, GST_SDP_EINVAL);
g_return_val_if_fail (caps != NULL && GST_IS_CAPS (caps), GST_SDP_EINVAL);
return sdp_addtributes_to_caps (media->attributes, caps);
}

5
gst-libs/gst/sdp/gstsdpmessage.h
View file

@ -501,6 +501,11 @@ GstSDPResult gst_sdp_media_replace_attribute (GstSDPMedia *media,
GstSDPResult gst_sdp_media_remove_attribute (GstSDPMedia *media, guint idx);
GstSDPResult gst_sdp_media_add_attribute (GstSDPMedia *media, const gchar *key,
const gchar *value);
GstCaps* gst_sdp_media_get_caps_from_media (const GstSDPMedia *media, gint pt);
GstSDPResult gst_sdp_media_set_media_from_caps (const GstCaps* caps, GstSDPMedia *media);
gchar * gst_sdp_make_keymgmt (const gchar *uri, const gchar *base64);
GstSDPResult gst_sdp_message_attributes_to_caps (const GstSDPMessage *msg, GstCaps *caps);
GstSDPResult gst_sdp_media_attributes_to_caps (const GstSDPMedia *media, GstCaps *caps);
#ifdef G_DEFINE_AUTOPTR_CLEANUP_FUNC
G_DEFINE_AUTOPTR_CLEANUP_FUNC(GstSDPMessage, gst_sdp_message_free)

105
tests/check/libs/sdp.c
View file

@ -62,6 +62,18 @@ static const gchar *sdp = "v=0\r\n"
"a=sendrecv\r\n" "m=audio 4545 RTP/AVP 14\r\n" "a=sendrecv\r\n"
"m=audio 1010 TCP 14\r\n";
static const gchar caps_video_string1[] =
"application/x-unknown, media=(string)video, payload=(int)96, "
"clock-rate=(int)90000, encoding-name=(string)MP4V-ES";
static const gchar caps_video_string2[] =
"application/x-unknown, media=(string)video, payload=(int)97, "
"clock-rate=(int)90000, encoding-name=(string)H263-1998";
static const gchar caps_audio_string[] =
"application/x-unknown, media=(string)audio, payload=(int)14, "
"clock-rate=(int)90000";
GST_START_TEST (boxed)
{
GValue value = G_VALUE_INIT;
@ -193,6 +205,97 @@ GST_START_TEST (modify)
gst_sdp_message_free (message);
}
GST_END_TEST
GST_START_TEST (caps_from_media)
{
GstSDPMessage *message;
glong length = -1;
const GstSDPMedia *media1, *media2, *media3;
GstCaps *caps_video1, *caps_video2, *caps_audio;
GstCaps *result_video1, *result_video2, *result_audio;
gst_sdp_message_new (&message);
gst_sdp_message_parse_buffer ((guint8 *) sdp, length, message);
media1 = gst_sdp_message_get_media (message, 0);
fail_unless (media1 != NULL);
media2 = gst_sdp_message_get_media (message, 1);
fail_unless (media2 != NULL);
media3 = gst_sdp_message_get_media (message, 2);
fail_unless (media2 != NULL);
caps_video1 = gst_sdp_media_get_caps_from_media (media1, 96);
caps_video2 = gst_sdp_media_get_caps_from_media (media1, 97);
caps_audio = gst_sdp_media_get_caps_from_media (media3, 14);
result_video1 = gst_caps_from_string (caps_video_string1);
fail_unless (gst_caps_is_strictly_equal (caps_video1, result_video1));
gst_caps_unref (result_video1);
gst_caps_unref (caps_video1);
result_video2 = gst_caps_from_string (caps_video_string2);
fail_unless (gst_caps_is_strictly_equal (caps_video2, result_video2));
gst_caps_unref (result_video2);
gst_caps_unref (caps_video2);
result_audio = gst_caps_from_string (caps_audio_string);
fail_unless (gst_caps_is_strictly_equal (caps_audio, result_audio));
gst_caps_unref (result_audio);
gst_caps_unref (caps_audio);
gst_sdp_message_free (message);
}
GST_END_TEST
GST_START_TEST (media_from_caps)
{
GstSDPResult ret = GST_SDP_OK;
GstSDPMessage *message;
glong length = -1;
GstSDPMedia *media_video, *media_audio;
const GstSDPMedia *result_video, *result_audio;
GstCaps *caps_video, *caps_audio;
const gchar *media1_text, *media2_text, *media3_text, *media4_text;
caps_video = gst_caps_from_string (caps_video_string1);
caps_audio = gst_caps_from_string (caps_audio_string);
gst_sdp_media_new (&media_video);
fail_unless (media_video != NULL);
gst_sdp_media_new (&media_audio);
fail_unless (media_audio != NULL);
ret = gst_sdp_media_set_media_from_caps (caps_video, media_video);
fail_unless (ret == GST_SDP_OK);
gst_caps_unref (caps_video);
ret = gst_sdp_media_set_media_from_caps (caps_audio, media_audio);
fail_unless (ret == GST_SDP_OK);
gst_caps_unref (caps_audio);
gst_sdp_message_new (&message);
gst_sdp_message_parse_buffer ((guint8 *) sdp, length, message);
result_video = gst_sdp_message_get_media (message, 0);
fail_unless (result_video != NULL);
result_audio = gst_sdp_message_get_media (message, 2);
fail_unless (result_audio != NULL);
media1_text = gst_sdp_media_get_attribute_val (media_video, "rtpmap");
media2_text = gst_sdp_media_get_attribute_val (result_video, "rtpmap");
media3_text = gst_sdp_media_get_format (media_audio, 0);
media4_text = gst_sdp_media_get_format (result_audio, 0);
fail_if (g_strcmp0 (media1_text, media2_text) != 0);
fail_if (g_strcmp0 (media3_text, media4_text) != 0);
gst_sdp_media_free (media_video);
gst_sdp_media_free (media_audio);
gst_sdp_message_free (message);
}
GST_END_TEST
/*
* End of test cases
@ -207,6 +310,8 @@ sdp_suite (void)
tcase_add_test (tc_chain, copy);
tcase_add_test (tc_chain, boxed);
tcase_add_test (tc_chain, modify);
tcase_add_test (tc_chain, caps_from_media);
tcase_add_test (tc_chain, media_from_caps);
return s;
}

7
win32/common/libgstsdp.def
View file

@ -6,6 +6,7 @@ EXPORTS
gst_mikey_message_add_rand_len
gst_mikey_message_add_t
gst_mikey_message_add_t_now_ntp_utc
gst_mikey_message_base64_encode
gst_mikey_message_find_payload
gst_mikey_message_get_cs_srtp
gst_mikey_message_get_n_cs
@ -16,6 +17,7 @@ EXPORTS
gst_mikey_message_insert_payload
gst_mikey_message_new
gst_mikey_message_new_from_bytes
gst_mikey_message_new_from_caps
gst_mikey_message_new_from_data
gst_mikey_message_remove_cs_srtp
gst_mikey_message_remove_payload
@ -49,12 +51,14 @@ EXPORTS
gst_sdp_bandwidth_set
gst_sdp_connection_clear
gst_sdp_connection_set
gst_sdp_make_keymgmt
gst_sdp_media_add_attribute
gst_sdp_media_add_bandwidth
gst_sdp_media_add_connection
gst_sdp_media_add_format
gst_sdp_media_as_text
gst_sdp_media_attributes_len
gst_sdp_media_attributes_to_caps
gst_sdp_media_bandwidths_len
gst_sdp_media_connections_len
gst_sdp_media_copy
@ -64,6 +68,7 @@ EXPORTS
gst_sdp_media_get_attribute_val
gst_sdp_media_get_attribute_val_n
gst_sdp_media_get_bandwidth
gst_sdp_media_get_caps_from_media
gst_sdp_media_get_connection
gst_sdp_media_get_format
gst_sdp_media_get_information
@ -89,6 +94,7 @@ EXPORTS
gst_sdp_media_set_information
gst_sdp_media_set_key
gst_sdp_media_set_media
gst_sdp_media_set_media_from_caps
gst_sdp_media_set_port_info
gst_sdp_media_set_proto
gst_sdp_media_uninit
@ -102,6 +108,7 @@ EXPORTS
gst_sdp_message_as_text
gst_sdp_message_as_uri
gst_sdp_message_attributes_len
gst_sdp_message_attributes_to_caps
gst_sdp_message_bandwidths_len
gst_sdp_message_copy
gst_sdp_message_dump