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Merge "sdp: Add support for T.38"

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This commit is contained in:
Joshua Colp
2017-04-27 05:38:14 -05:00
committed by Gerrit Code Review
parent ed69471f94 19a79ae12c
commit 78eb08e7ba
10 changed files with 623 additions and 47 deletions
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5
include/asterisk/format_cache.h
View File

@@ -223,6 +223,11 @@ extern struct ast_format *ast_format_t140;
*/
extern struct ast_format *ast_format_t140_red;
/*!
* \brief Built-in cached T.38 format.
*/
extern struct ast_format *ast_format_t38;
/*!
* \brief Built-in "null" format.
*/

82
include/asterisk/sdp_options.h
View File

@@ -19,6 +19,8 @@
#ifndef _ASTERISK_SDP_OPTIONS_H
#define _ASTERISK_SDP_OPTIONS_H
#include "asterisk/udptl.h"
struct ast_sdp_options;
/*!
@@ -427,4 +429,84 @@ unsigned int ast_sdp_options_get_rtcp_mux(const struct ast_sdp_options *options)
*/
void ast_sdp_options_set_rtcp_mux(struct ast_sdp_options *options, unsigned int value);
/*!
* \since 15.0.0
* \brief Set SDP Options udptl_symmetric
*
* \param options SDP Options
* \param udptl_symmetric
*/
void ast_sdp_options_set_udptl_symmetric(struct ast_sdp_options *options,
unsigned int udptl_symmetric);
/*!
* \since 15.0.0
* \brief Get SDP Options udptl_symmetric
*
* \param options SDP Options
*
* \returns udptl_symmetric
*/
unsigned int ast_sdp_options_get_udptl_symmetric(const struct ast_sdp_options *options);
/*!
* \since 15.0.0
* \brief Set SDP Options udptl_error_correction
*
* \param options SDP Options
* \param error_correction
*/
void ast_sdp_options_set_udptl_error_correction(struct ast_sdp_options *options,
enum ast_t38_ec_modes error_correction);
/*!
* \since 15.0.0
* \brief Get SDP Options udptl_error_correction
*
* \param options SDP Options
*
* \returns udptl_error_correction
*/
enum ast_t38_ec_modes ast_sdp_options_get_udptl_error_correction(const struct ast_sdp_options *options);
/*!
* \since 15.0.0
* \brief Set SDP Options udptl_far_max_datagram
*
* \param options SDP Options
* \param far_max_datagram
*/
void ast_sdp_options_set_udptl_far_max_datagram(struct ast_sdp_options *options,
unsigned int far_max_datagram);
/*!
* \since 15.0.0
* \brief Get SDP Options udptl_far_max_datagram
*
* \param options SDP Options
*
* \returns udptl_far_max_datagram
*/
unsigned int ast_sdp_options_get_udptl_far_max_datagram(const struct ast_sdp_options *options);
/*!
* \since 15.0.0
* \brief Set SDP Options bind_udptl_to_media_address
*
* \param options SDP Options
* \param bind_udptl_to_media_address
*/
void ast_sdp_options_set_bind_udptl_to_media_address(struct ast_sdp_options *options,
unsigned int bind_udptl_to_media_address);
/*!
* \since 15.0.0
* \brief Get SDP Options bind_udptl_to_media_address
*
* \param options SDP Options
*
* \returns bind_udptl_to_media_address
*/
unsigned int ast_sdp_options_get_bind_udptl_to_media_address(const struct ast_sdp_options *options);
#endif /* _ASTERISK_SDP_OPTIONS_H */

21
include/asterisk/sdp_state.h
View File

@@ -24,6 +24,8 @@
struct ast_sdp_state;
struct ast_sockaddr;
struct ast_udptl;
struct ast_control_t38_parameters;
/*!
* \brief Allocate a new SDP state
@@ -51,6 +53,14 @@ void ast_sdp_state_free(struct ast_sdp_state *sdp_state);
struct ast_rtp_instance *ast_sdp_state_get_rtp_instance(const struct ast_sdp_state *sdp_state,
int stream_index);
/*!
* \brief Get the associated UDPTL instance for a particular stream on the SDP state.
*
* Stream numbers correspond to the streams in the topology of the associated channel
*/
struct ast_udptl *ast_sdp_state_get_udptl_instance(const struct ast_sdp_state *sdp_state,
int stream_index);
/*!
* \brief Get the global connection address on the SDP state.
*/
@@ -223,6 +233,17 @@ int ast_sdp_state_set_connection_address(struct ast_sdp_state *sdp_state, int st
void ast_sdp_state_set_locally_held(struct ast_sdp_state *sdp_state,
int stream_index, unsigned int locally_held);
/*!
* \since 15.0.0
* \brief Set the UDPTL session parameters
*
* \param sdp_state
* \param stream_index The stream to set the UDPTL session parameters for
* \param params
*/
void ast_sdp_state_set_t38_parameters(struct ast_sdp_state *sdp_state,
int stream_index, struct ast_control_t38_parameters *params);
/*!
* \since 15.0.0
* \brief Get whether a stream is held or not

7
main/codec_builtin.c
View File

@@ -822,6 +822,12 @@ static struct ast_codec t140 = {
.type = AST_MEDIA_TYPE_TEXT,
};
static struct ast_codec t38 = {
.name = "t38",
.description = "T.38 UDPTL Fax",
.type = AST_MEDIA_TYPE_IMAGE,
};
static int silk_samples(struct ast_frame *frame)
{
/* XXX This is likely not at all what's intended from this callback. However,
@@ -952,6 +958,7 @@ int ast_codec_builtin_init(void)
res |= CODEC_REGISTER_AND_CACHE(vp8);
res |= CODEC_REGISTER_AND_CACHE(t140red);
res |= CODEC_REGISTER_AND_CACHE(t140);
res |= CODEC_REGISTER_AND_CACHE(t38);
res |= CODEC_REGISTER_AND_CACHE(none);
res |= CODEC_REGISTER_AND_CACHE_NAMED("silk8", silk8);
res |= CODEC_REGISTER_AND_CACHE_NAMED("silk12", silk12);

8
main/format_cache.c
View File

@@ -230,6 +230,11 @@ struct ast_format *ast_format_t140;
*/
struct ast_format *ast_format_t140_red;
/*!
* \brief Built-in cached T.38 format.
*/
struct ast_format *ast_format_t38;
/*!
* \brief Built-in "null" format.
*/
@@ -342,6 +347,7 @@ static void format_cache_shutdown(void)
ao2_replace(ast_format_vp8, NULL);
ao2_replace(ast_format_t140_red, NULL);
ao2_replace(ast_format_t140, NULL);
ao2_replace(ast_format_t38, NULL);
ao2_replace(ast_format_none, NULL);
ao2_replace(ast_format_silk8, NULL);
ao2_replace(ast_format_silk12, NULL);
@@ -442,6 +448,8 @@ static void set_cached_format(const char *name, struct ast_format *format)
ao2_replace(ast_format_t140_red, format);
} else if (!strcmp(name, "t140")) {
ao2_replace(ast_format_t140, format);
} else if (!strcmp(name, "t38")) {
ao2_replace(ast_format_t38, format);
} else if (!strcmp(name, "none")) {
ao2_replace(ast_format_none, format);
} else if (!strcmp(name, "silk8")) {

61
main/sdp.c
View File

@@ -23,6 +23,7 @@
#include "asterisk/codec.h"
#include "asterisk/format.h"
#include "asterisk/format_cap.h"
#include "asterisk/format_cache.h"
#include "asterisk/rtp_engine.h"
#include "asterisk/sdp_state.h"
#include "asterisk/sdp_options.h"
@@ -712,34 +713,56 @@ static struct ast_stream *get_stream_from_m(const struct ast_sdp_m_line *m_line)
ao2_ref(caps, -1);
return NULL;
}
ast_rtp_codecs_payloads_initialize(&codecs);
for (i = 0; i < ast_sdp_m_get_payload_count(m_line); ++i) {
struct ast_sdp_payload *payload_s;
struct ast_sdp_rtpmap *rtpmap;
int payload;
switch (ast_stream_get_type(stream)) {
case AST_MEDIA_TYPE_AUDIO:
case AST_MEDIA_TYPE_VIDEO:
ast_rtp_codecs_payloads_initialize(&codecs);
payload_s = ast_sdp_m_get_payload(m_line, i);
sscanf(payload_s->fmt, "%30d", &payload);
ast_rtp_codecs_payloads_set_m_type(&codecs, NULL, payload);
for (i = 0; i < ast_sdp_m_get_payload_count(m_line); ++i) {
struct ast_sdp_payload *payload_s;
struct ast_sdp_rtpmap *rtpmap;
int payload;
rtpmap = sdp_payload_get_rtpmap(m_line, payload);
if (!rtpmap) {
continue;
payload_s = ast_sdp_m_get_payload(m_line, i);
sscanf(payload_s->fmt, "%30d", &payload);
ast_rtp_codecs_payloads_set_m_type(&codecs, NULL, payload);
rtpmap = sdp_payload_get_rtpmap(m_line, payload);
if (!rtpmap) {
continue;
}
ast_rtp_codecs_payloads_set_rtpmap_type_rate(&codecs, NULL,
payload, m_line->type, rtpmap->encoding_name, 0,
rtpmap->clock_rate);
ast_sdp_rtpmap_free(rtpmap);
process_fmtp(m_line, payload, &codecs);
}
ast_rtp_codecs_payloads_set_rtpmap_type_rate(&codecs, NULL,
payload, m_line->type, rtpmap->encoding_name, 0,
rtpmap->clock_rate);
ast_sdp_rtpmap_free(rtpmap);
process_fmtp(m_line, payload, &codecs);
ast_rtp_codecs_payload_formats(&codecs, caps, &non_ast_fmts);
ast_rtp_codecs_payloads_destroy(&codecs);
break;
case AST_MEDIA_TYPE_IMAGE:
for (i = 0; i < ast_sdp_m_get_payload_count(m_line); ++i) {
struct ast_sdp_payload *payload;
/* As we don't carry T.38 over RTP we do our own format check */
payload = ast_sdp_m_get_payload(m_line, i);
if (!strcasecmp(payload->fmt, "t38")) {
ast_format_cap_append(caps, ast_format_t38, 0);
}
}
break;
case AST_MEDIA_TYPE_UNKNOWN:
case AST_MEDIA_TYPE_TEXT:
case AST_MEDIA_TYPE_END:
break;
}
ast_rtp_codecs_payload_formats(&codecs, caps, &non_ast_fmts);
ast_stream_set_formats(stream, caps);
ao2_ref(caps, -1);
ast_rtp_codecs_payloads_destroy(&codecs);
return stream;
}

4
main/sdp_options.c
View File

@@ -60,7 +60,11 @@ DEFINE_STRINGFIELD_GETTERS_SETTERS_FOR(sdpsession, 0);
DEFINE_STRINGFIELD_GETTERS_SETTERS_FOR(rtp_engine, 0);
DEFINE_GETTERS_SETTERS_FOR(unsigned int, bind_rtp_to_media_address);
DEFINE_GETTERS_SETTERS_FOR(unsigned int, bind_udptl_to_media_address);
DEFINE_GETTERS_SETTERS_FOR(unsigned int, rtp_symmetric);
DEFINE_GETTERS_SETTERS_FOR(unsigned int, udptl_symmetric);
DEFINE_GETTERS_SETTERS_FOR(enum ast_t38_ec_modes, udptl_error_correction);
DEFINE_GETTERS_SETTERS_FOR(unsigned int, udptl_far_max_datagram);
DEFINE_GETTERS_SETTERS_FOR(unsigned int, telephone_event);
DEFINE_GETTERS_SETTERS_FOR(unsigned int, rtp_ipv6);
DEFINE_GETTERS_SETTERS_FOR(unsigned int, g726_non_standard);

4
main/sdp_private.h
View File

@@ -35,7 +35,9 @@ struct ast_sdp_options {
);
struct {
unsigned int bind_rtp_to_media_address : 1;
unsigned int bind_udptl_to_media_address : 1;
unsigned int rtp_symmetric : 1;
unsigned int udptl_symmetric : 1;
unsigned int telephone_event : 1;
unsigned int rtp_ipv6 : 1;
unsigned int g726_non_standard : 1;
@@ -47,10 +49,12 @@ struct ast_sdp_options {
unsigned int cos_audio;
unsigned int tos_video;
unsigned int cos_video;
unsigned int udptl_far_max_datagram;
};
enum ast_sdp_options_ice ice;
enum ast_sdp_options_impl impl;
enum ast_sdp_options_encryption encryption;
enum ast_t38_ec_modes udptl_error_correction;
};
#endif /* _MAIN_SDP_PRIVATE_H */

439
main/sdp_state.c
View File

@@ -28,6 +28,7 @@
#include "asterisk/format_cap.h"
#include "asterisk/config.h"
#include "asterisk/codec.h"
#include "asterisk/udptl.h"
#include "../include/asterisk/sdp.h"
#include "asterisk/stream.h"
@@ -63,21 +64,53 @@ enum ast_sdp_role {
typedef int (*state_fn)(struct ast_sdp_state *state);
struct sdp_state_udptl {
/*! The underlying UDPTL instance */
struct ast_udptl *instance;
};
struct sdp_state_stream {
/*! Type of the stream */
enum ast_media_type type;
union {
/*! The underlying RTP instance */
struct ast_rtp_instance *instance;
/*! The underlying UDPTL instance */
struct sdp_state_udptl *udptl;
};
/*! An explicit connection address for this stream */
struct ast_sockaddr connection_address;
/*! Whether this stream is held or not */
unsigned int locally_held;
/*! UDPTL session parameters */
struct ast_control_t38_parameters t38_local_params;
};
static void sdp_state_udptl_destroy(void *obj)
{
struct sdp_state_udptl *udptl = obj;
if (udptl->instance) {
ast_udptl_destroy(udptl->instance);
}
}
static void sdp_state_stream_free(struct sdp_state_stream *state_stream)
{
if (state_stream->instance) {
ast_rtp_instance_destroy(state_stream->instance);
switch (state_stream->type) {
case AST_MEDIA_TYPE_AUDIO:
case AST_MEDIA_TYPE_VIDEO:
if (state_stream->instance) {
ast_rtp_instance_destroy(state_stream->instance);
}
break;
case AST_MEDIA_TYPE_IMAGE:
ao2_cleanup(state_stream->udptl);
break;
case AST_MEDIA_TYPE_UNKNOWN:
case AST_MEDIA_TYPE_TEXT:
case AST_MEDIA_TYPE_END:
break;
}
ast_free(state_stream);
}
@@ -165,6 +198,43 @@ static struct ast_rtp_instance *create_rtp(const struct ast_sdp_options *options
return rtp;
}
/*! \brief Internal function which creates a UDPTL instance */
static struct sdp_state_udptl *create_udptl(const struct ast_sdp_options *options)
{
struct sdp_state_udptl *udptl;
struct ast_sockaddr temp_media_address;
static struct ast_sockaddr address_udptl;
struct ast_sockaddr *media_address = &address_udptl;
if (options->bind_udptl_to_media_address && !ast_strlen_zero(options->media_address)) {
ast_sockaddr_parse(&temp_media_address, options->media_address, 0);
media_address = &temp_media_address;
} else {
if (ast_check_ipv6()) {
ast_sockaddr_parse(&address_udptl, "::", 0);
} else {
ast_sockaddr_parse(&address_udptl, "0.0.0.0", 0);
}
}
udptl = ao2_alloc_options(sizeof(*udptl), sdp_state_udptl_destroy, AO2_ALLOC_OPT_LOCK_NOLOCK);
if (!udptl) {
return NULL;
}
udptl->instance = ast_udptl_new_with_bindaddr(NULL, NULL, 0, media_address);
if (!udptl->instance) {
ao2_ref(udptl, -1);
return NULL;
}
ast_udptl_set_error_correction_scheme(udptl->instance, ast_sdp_options_get_udptl_error_correction(options));
ast_udptl_setnat(udptl->instance, ast_sdp_options_get_udptl_symmetric(options));
ast_udptl_set_far_max_datagram(udptl->instance, ast_sdp_options_get_udptl_far_max_datagram(options));
return udptl;
}
static struct sdp_state_capabilities *sdp_initialize_state_capabilities(const struct ast_stream_topology *topology,
const struct ast_sdp_options *options)
{
@@ -191,22 +261,34 @@ static struct sdp_state_capabilities *sdp_initialize_state_capabilities(const st
for (i = 0; i < ast_stream_topology_get_count(topology); ++i) {
struct sdp_state_stream *state_stream;
enum ast_media_type stream_type;
state_stream = ast_calloc(1, sizeof(*state_stream));
if (!state_stream) {
return NULL;
}
stream_type = ast_stream_get_type(ast_stream_topology_get_stream(topology, i));
state_stream->type = ast_stream_get_type(ast_stream_topology_get_stream(topology, i));
if (stream_type == AST_MEDIA_TYPE_AUDIO || stream_type == AST_MEDIA_TYPE_VIDEO) {
state_stream->instance = create_rtp(options, stream_type);
}
if (!state_stream->instance) {
sdp_state_stream_free(state_stream);
return NULL;
switch (state_stream->type) {
case AST_MEDIA_TYPE_AUDIO:
case AST_MEDIA_TYPE_VIDEO:
state_stream->instance = create_rtp(options, state_stream->type);
if (!state_stream->instance) {
sdp_state_stream_free(state_stream);
return NULL;
}
break;
case AST_MEDIA_TYPE_IMAGE:
state_stream->udptl = create_udptl(options);
if (!state_stream->udptl) {
sdp_state_stream_free(state_stream);
return NULL;
}
break;
case AST_MEDIA_TYPE_UNKNOWN:
case AST_MEDIA_TYPE_TEXT:
case AST_MEDIA_TYPE_END:
break;
}
AST_VECTOR_APPEND(&capabilities->streams, state_stream);
@@ -314,6 +396,9 @@ struct ast_rtp_instance *ast_sdp_state_get_rtp_instance(
struct sdp_state_stream *stream_state;
ast_assert(sdp_state != NULL);
ast_assert(ast_stream_get_type(ast_stream_topology_get_stream(sdp_state->proposed_capabilities->topology,
stream_index)) == AST_MEDIA_TYPE_AUDIO || ast_stream_get_type(ast_stream_topology_get_stream(
sdp_state->proposed_capabilities->topology, stream_index)) == AST_MEDIA_TYPE_VIDEO);
stream_state = sdp_state_get_stream(sdp_state, stream_index);
if (!stream_state) {
@@ -323,6 +408,23 @@ struct ast_rtp_instance *ast_sdp_state_get_rtp_instance(
return stream_state->instance;
}
struct ast_udptl *ast_sdp_state_get_udptl_instance(
const struct ast_sdp_state *sdp_state, int stream_index)
{
struct sdp_state_stream *stream_state;
ast_assert(sdp_state != NULL);
ast_assert(ast_stream_get_type(ast_stream_topology_get_stream(sdp_state->proposed_capabilities->topology,
stream_index)) == AST_MEDIA_TYPE_IMAGE);
stream_state = sdp_state_get_stream(sdp_state, stream_index);
if (!stream_state || !stream_state->udptl) {
return NULL;
}
return stream_state->udptl->instance;
}
const struct ast_sockaddr *ast_sdp_state_get_connection_address(const struct ast_sdp_state *sdp_state)
{
ast_assert(sdp_state != NULL);
@@ -334,7 +436,6 @@ int ast_sdp_state_get_stream_connection_address(const struct ast_sdp_state *sdp_
int stream_index, struct ast_sockaddr *address)
{
struct sdp_state_stream *stream_state;
enum ast_media_type type;
ast_assert(sdp_state != NULL);
ast_assert(address != NULL);
@@ -350,12 +451,18 @@ int ast_sdp_state_get_stream_connection_address(const struct ast_sdp_state *sdp_
return 0;
}
type = ast_stream_get_type(ast_stream_topology_get_stream(sdp_state->proposed_capabilities->topology,
stream_index));
if (type == AST_MEDIA_TYPE_AUDIO || type == AST_MEDIA_TYPE_VIDEO) {
switch (ast_stream_get_type(ast_stream_topology_get_stream(sdp_state->proposed_capabilities->topology,
stream_index))) {
case AST_MEDIA_TYPE_AUDIO:
case AST_MEDIA_TYPE_VIDEO:
ast_rtp_instance_get_local_address(stream_state->instance, address);
} else {
break;
case AST_MEDIA_TYPE_IMAGE:
ast_udptl_get_us(stream_state->udptl->instance, address);
break;
case AST_MEDIA_TYPE_UNKNOWN:
case AST_MEDIA_TYPE_TEXT:
case AST_MEDIA_TYPE_END:
return -1;
}
@@ -556,7 +663,22 @@ static struct sdp_state_capabilities *merge_capabilities(const struct sdp_state_
}
current_state_stream = AST_VECTOR_GET(&current->streams, current_index);
joint_state_stream->instance = ao2_bump(current_state_stream->instance);
joint_state_stream->type = current_state_stream->type;
switch (joint_state_stream->type) {
case AST_MEDIA_TYPE_AUDIO:
case AST_MEDIA_TYPE_VIDEO:
joint_state_stream->instance = ao2_bump(current_state_stream->instance);
break;
case AST_MEDIA_TYPE_IMAGE:
joint_state_stream->udptl = ao2_bump(current_state_stream->udptl);
joint_state_stream->t38_local_params = current_state_stream->t38_local_params;
break;
case AST_MEDIA_TYPE_UNKNOWN:
case AST_MEDIA_TYPE_TEXT:
case AST_MEDIA_TYPE_END:
break;
}
if (!ast_sockaddr_isnull(&current_state_stream->connection_address)) {
ast_sockaddr_copy(&joint_state_stream->connection_address, &current_state_stream->connection_address);
@@ -572,11 +694,25 @@ static struct sdp_state_capabilities *merge_capabilities(const struct sdp_state_
if (!joint_stream) {
goto fail;
}
if (new_stream_type == AST_MEDIA_TYPE_AUDIO || new_stream_type == AST_MEDIA_TYPE_VIDEO) {
switch (new_stream_type) {
case AST_MEDIA_TYPE_AUDIO:
case AST_MEDIA_TYPE_VIDEO:
joint_state_stream->instance = create_rtp(options, new_stream_type);
if (!joint_state_stream->instance) {
goto fail;
}
break;
case AST_MEDIA_TYPE_IMAGE:
joint_state_stream->udptl = create_udptl(options);
if (!joint_state_stream->udptl) {
goto fail;
}
break;
case AST_MEDIA_TYPE_UNKNOWN:
case AST_MEDIA_TYPE_TEXT:
case AST_MEDIA_TYPE_END:
break;
}
ast_sockaddr_setnull(&joint_state_stream->connection_address);
joint_state_stream->locally_held = 0;
@@ -747,6 +883,63 @@ static void update_rtp_after_merge(const struct ast_sdp_state *state, struct ast
}
}
/*!
* \brief Update UDPTL instances based on merged SDPs
*
* UDPTL instances, when first allocated, cannot make assumptions about what the other
* side supports and thus has to go with some default behaviors. This function gets
* called after we know both what we support and what the remote endpoint supports.
* This way, we can update the UDPTL instance to reflect what is supported by both
* sides.
*
* \param state The SDP state in which SDPs have been negotiated
* \param udptl The UDPTL instance that is being updated
* \param options Our locally-supported SDP options
* \param remote_sdp The SDP we most recently received
* \param remote_m_line The remote SDP stream that corresponds to the RTP instance we are modifying
*/
static void update_udptl_after_merge(const struct ast_sdp_state *state, struct sdp_state_udptl *udptl,
const struct ast_sdp_options *options,
const struct ast_sdp *remote_sdp,
const struct ast_sdp_m_line *remote_m_line)
{
struct ast_sdp_a_line *a_line;
struct ast_sdp_c_line *c_line;
unsigned int fax_max_datagram;
struct ast_sockaddr *addrs;
a_line = ast_sdp_m_find_attribute(remote_m_line, "t38faxmaxdatagram", -1);
if (!a_line) {
a_line = ast_sdp_m_find_attribute(remote_m_line, "t38maxdatagram", -1);
}
if (a_line && !ast_sdp_options_get_udptl_far_max_datagram(options) &&
(sscanf(a_line->value, "%30u", &fax_max_datagram) == 1)) {
ast_udptl_set_far_max_datagram(udptl->instance, fax_max_datagram);
}
a_line = ast_sdp_m_find_attribute(remote_m_line, "t38faxudpec", -1);
if (a_line) {
if (!strcasecmp(a_line->value, "t38UDPRedundancy")) {
ast_udptl_set_error_correction_scheme(udptl->instance, UDPTL_ERROR_CORRECTION_REDUNDANCY);
} else if (!strcasecmp(a_line->value, "t38UDPFEC")) {
ast_udptl_set_error_correction_scheme(udptl->instance, UDPTL_ERROR_CORRECTION_FEC);
} else {
ast_udptl_set_error_correction_scheme(udptl->instance, UDPTL_ERROR_CORRECTION_NONE);
}
}
c_line = remote_sdp->c_line;
if (remote_m_line->c_line) {
c_line = remote_m_line->c_line;
}
if (ast_sockaddr_resolve(&addrs, c_line->address, PARSE_PORT_FORBID, AST_AF_UNSPEC) > 0) {
ast_sockaddr_set_port(addrs, remote_m_line->port);
ast_udptl_set_peer(udptl->instance, addrs);
ast_free(addrs);
}
}
static void set_negotiated_capabilities(struct ast_sdp_state *sdp_state,
struct sdp_state_capabilities *new_capabilities)
{
@@ -811,14 +1004,23 @@ static int merge_sdps(struct ast_sdp_state *sdp_state,
for (i = 0; i < AST_VECTOR_SIZE(&joint_capabilities->streams); ++i) {
struct sdp_state_stream *state_stream;
enum ast_media_type stream_type;
stream_type = ast_stream_get_type(ast_stream_topology_get_stream(joint_capabilities->topology, i));
state_stream = AST_VECTOR_GET(&joint_capabilities->streams, i);
if ((stream_type == AST_MEDIA_TYPE_AUDIO || stream_type == AST_MEDIA_TYPE_VIDEO) && state_stream->instance) {
switch (ast_stream_get_type(ast_stream_topology_get_stream(joint_capabilities->topology, i))) {
case AST_MEDIA_TYPE_AUDIO:
case AST_MEDIA_TYPE_VIDEO:
update_rtp_after_merge(sdp_state, state_stream->instance, sdp_state->options,
remote_sdp, ast_sdp_get_m(remote_sdp, i));
break;
case AST_MEDIA_TYPE_IMAGE:
update_udptl_after_merge(sdp_state, state_stream->udptl, sdp_state->options,
remote_sdp, ast_sdp_get_m(remote_sdp, i));
break;
case AST_MEDIA_TYPE_UNKNOWN:
case AST_MEDIA_TYPE_TEXT:
case AST_MEDIA_TYPE_END:
break;
}
}
@@ -966,6 +1168,20 @@ unsigned int ast_sdp_state_get_locally_held(const struct ast_sdp_state *sdp_stat
return stream_state->locally_held;
}
void ast_sdp_state_set_t38_parameters(struct ast_sdp_state *sdp_state,
int stream_index, struct ast_control_t38_parameters *params)
{
struct sdp_state_stream *stream_state;
ast_assert(sdp_state != NULL && params != NULL);
stream_state = sdp_state_get_stream(sdp_state, stream_index);
if (!stream_state) {
return;
}
stream_state->t38_local_params = *params;
}
static int sdp_add_m_from_rtp_stream(struct ast_sdp *sdp, const struct ast_sdp_state *sdp_state,
const struct ast_sdp_options *options, const struct sdp_state_capabilities *capabilities, int stream_index)
{
@@ -1104,6 +1320,167 @@ static int sdp_add_m_from_rtp_stream(struct ast_sdp *sdp, const struct ast_sdp_s
return 0;
}
/*! \brief Get Max T.38 Transmission rate from T38 capabilities */
static unsigned int t38_get_rate(enum ast_control_t38_rate rate)
{
switch (rate) {
case AST_T38_RATE_2400:
return 2400;
case AST_T38_RATE_4800:
return 4800;
case AST_T38_RATE_7200:
return 7200;
case AST_T38_RATE_9600:
return 9600;
case AST_T38_RATE_12000:
return 12000;
case AST_T38_RATE_14400:
return 14400;
default:
return 0;
}
}
static int sdp_add_m_from_udptl_stream(struct ast_sdp *sdp, const struct ast_sdp_state *sdp_state,
const struct ast_sdp_options *options, const struct sdp_state_capabilities *capabilities, int stream_index)
{
struct ast_stream *stream;
struct ast_sdp_m_line *m_line;
struct ast_sdp_payload *payload;
char tmp[64];
struct ast_sockaddr address_udptl;
struct sdp_state_udptl *udptl;
struct ast_sdp_a_line *a_line;
struct sdp_state_stream *stream_state;
stream = ast_stream_topology_get_stream(capabilities->topology, stream_index);
udptl = AST_VECTOR_GET(&capabilities->streams, stream_index)->udptl;
ast_assert(sdp && options && stream);
if (udptl) {
if (ast_sdp_state_get_stream_connection_address(sdp_state, 0, &address_udptl)) {
return -1;
}
} else {
ast_sockaddr_setnull(&address_udptl);
}
m_line = ast_sdp_m_alloc(
ast_codec_media_type2str(ast_stream_get_type(stream)),
ast_sockaddr_port(&address_udptl), 1, "udptl", NULL);
if (!m_line) {
return -1;
}
payload = ast_sdp_payload_alloc("t38");
if (!payload || ast_sdp_m_add_payload(m_line, payload)) {
ast_sdp_payload_free(payload);
ast_sdp_m_free(m_line);
return -1;
}
stream_state = sdp_state_get_stream(sdp_state, stream_index);
snprintf(tmp, sizeof(tmp), "%u", stream_state->t38_local_params.version);
a_line = ast_sdp_a_alloc("T38FaxVersion", tmp);
if (!a_line || ast_sdp_m_add_a(m_line, a_line)) {
ast_sdp_a_free(a_line);
ast_sdp_m_free(m_line);
return -1;
}
snprintf(tmp, sizeof(tmp), "%u", t38_get_rate(stream_state->t38_local_params.rate));
a_line = ast_sdp_a_alloc("T38FaxMaxBitRate", tmp);
if (!a_line || ast_sdp_m_add_a(m_line, a_line)) {
ast_sdp_a_free(a_line);
ast_sdp_m_free(m_line);
return -1;
}
if (stream_state->t38_local_params.fill_bit_removal) {
a_line = ast_sdp_a_alloc("T38FaxFillBitRemoval", "");
if (!a_line || ast_sdp_m_add_a(m_line, a_line)) {
ast_sdp_a_free(a_line);
ast_sdp_m_free(m_line);
return -1;
}
}
if (stream_state->t38_local_params.transcoding_mmr) {
a_line = ast_sdp_a_alloc("T38FaxTranscodingMMR", "");
if (!a_line || ast_sdp_m_add_a(m_line, a_line)) {
ast_sdp_a_free(a_line);
ast_sdp_m_free(m_line);
return -1;
}
}
if (stream_state->t38_local_params.transcoding_jbig) {
a_line = ast_sdp_a_alloc("T38FaxTranscodingJBIG", "");
if (!a_line || ast_sdp_m_add_a(m_line, a_line)) {
ast_sdp_a_free(a_line);
ast_sdp_m_free(m_line);
return -1;
}
}
switch (stream_state->t38_local_params.rate_management) {
case AST_T38_RATE_MANAGEMENT_TRANSFERRED_TCF:
a_line = ast_sdp_a_alloc("T38FaxRateManagement", "transferredTCF");
if (!a_line || ast_sdp_m_add_a(m_line, a_line)) {
ast_sdp_a_free(a_line);
ast_sdp_m_free(m_line);
return -1;
}
break;
case AST_T38_RATE_MANAGEMENT_LOCAL_TCF:
a_line = ast_sdp_a_alloc("T38FaxRateManagement", "localTCF");
if (!a_line || ast_sdp_m_add_a(m_line, a_line)) {
ast_sdp_a_free(a_line);
ast_sdp_m_free(m_line);
return -1;
}
break;
}
snprintf(tmp, sizeof(tmp), "%u", ast_udptl_get_local_max_datagram(udptl->instance));
a_line = ast_sdp_a_alloc("T38FaxMaxDatagram", tmp);
if (!a_line || ast_sdp_m_add_a(m_line, a_line)) {
ast_sdp_a_free(a_line);
ast_sdp_m_free(m_line);
return -1;
}
switch (ast_udptl_get_error_correction_scheme(udptl->instance)) {
case UDPTL_ERROR_CORRECTION_NONE:
break;
case UDPTL_ERROR_CORRECTION_FEC:
a_line = ast_sdp_a_alloc("T38FaxUdpEC", "t38UDPFEC");
if (!a_line || ast_sdp_m_add_a(m_line, a_line)) {
ast_sdp_a_free(a_line);
ast_sdp_m_free(m_line);
return -1;
}
break;
case UDPTL_ERROR_CORRECTION_REDUNDANCY:
a_line = ast_sdp_a_alloc("T38FaxUdpEC", "t38UDPRedundancy");
if (!a_line || ast_sdp_m_add_a(m_line, a_line)) {
ast_sdp_a_free(a_line);
ast_sdp_m_free(m_line);
return -1;
}
break;
}
if (ast_sdp_add_m(sdp, m_line)) {
ast_sdp_m_free(m_line);
return -1;
}
return 0;
}
/*!
* \brief Create an SDP based on current SDP state
*
@@ -1155,12 +1532,22 @@ static struct ast_sdp *sdp_create_from_state(const struct ast_sdp_state *sdp_sta
stream_count = ast_stream_topology_get_count(topology);
for (stream_num = 0; stream_num < stream_count; stream_num++) {
enum ast_media_type type = ast_stream_get_type(ast_stream_topology_get_stream(topology, stream_num));
if (type == AST_MEDIA_TYPE_AUDIO || type == AST_MEDIA_TYPE_VIDEO) {
switch (ast_stream_get_type(ast_stream_topology_get_stream(topology, stream_num))) {
case AST_MEDIA_TYPE_AUDIO:
case AST_MEDIA_TYPE_VIDEO:
if (sdp_add_m_from_rtp_stream(sdp, sdp_state, options, capabilities, stream_num)) {
goto error;
}
break;
case AST_MEDIA_TYPE_IMAGE:
if (sdp_add_m_from_udptl_stream(sdp, sdp_state, options, capabilities, stream_num)) {
goto error;
}
break;
case AST_MEDIA_TYPE_UNKNOWN:
case AST_MEDIA_TYPE_TEXT:
case AST_MEDIA_TYPE_END:
break;
}
}

39
tests/test_sdp.c
View File

@@ -130,6 +130,22 @@ static int validate_rtpmap(struct ast_test *test, const struct ast_sdp_m_line *m
return -1;
}
static enum ast_test_result_state validate_t38(struct ast_test *test, const struct ast_sdp_m_line *m_line)
{
struct ast_sdp_a_line *a_line;
a_line = ast_sdp_m_find_attribute(m_line, "T38FaxVersion", -1);
ast_test_validate(test, a_line && !strcmp(a_line->value, "0"));
a_line = ast_sdp_m_find_attribute(m_line, "T38FaxMaxBitRate", -1);
ast_test_validate(test, a_line && !strcmp(a_line->value, "14400"));
a_line = ast_sdp_m_find_attribute(m_line, "T38FaxRateManagement", -1);
ast_test_validate(test, a_line && !strcmp(a_line->value, "transferredTCF"));
return AST_TEST_PASS;
}
AST_TEST_DEFINE(invalid_rtpmap)
{
/* a=rtpmap: is already assumed. This is the part after that */
@@ -405,6 +421,7 @@ AST_TEST_DEFINE(topology_to_sdp)
struct sdp_format formats[] = {
{ AST_MEDIA_TYPE_AUDIO, "ulaw,alaw,g722,opus" },
{ AST_MEDIA_TYPE_VIDEO, "h264,vp8" },
{ AST_MEDIA_TYPE_IMAGE, "t38" },
};
switch(cmd) {
@@ -437,7 +454,7 @@ AST_TEST_DEFINE(topology_to_sdp)
goto end;
}
if (ast_sdp_get_m_count(sdp) != 2) {
if (ast_sdp_get_m_count(sdp) != 3) {
ast_test_status_update(test, "Unexpected number of streams in generated SDP: %d\n",
ast_sdp_get_m_count(sdp));
goto end;
@@ -478,6 +495,14 @@ AST_TEST_DEFINE(topology_to_sdp)
goto end;
}
m_line = ast_sdp_get_m(sdp, 2);
if (validate_m_line(test, m_line, "image", 1)) {
goto end;
}
if (validate_t38(test, m_line) != AST_TEST_PASS) {
goto end;
}
res = AST_TEST_PASS;
end:
@@ -527,6 +552,7 @@ AST_TEST_DEFINE(sdp_to_topology)
struct sdp_format sdp_formats[] = {
{ AST_MEDIA_TYPE_AUDIO, "ulaw,alaw,g722,opus" },
{ AST_MEDIA_TYPE_VIDEO, "h264,vp8" },
{ AST_MEDIA_TYPE_IMAGE, "t38" },
};
static const char *expected_audio_formats[] = {
"ulaw",
@@ -538,6 +564,9 @@ AST_TEST_DEFINE(sdp_to_topology)
"h264",
"vp8",
};
static const char *expected_image_formats[] = {
"t38",
};
switch(cmd) {
case TEST_INIT:
@@ -565,7 +594,7 @@ AST_TEST_DEFINE(sdp_to_topology)
topology = ast_get_topology_from_sdp(sdp);
if (ast_stream_topology_get_count(topology) != 2) {
if (ast_stream_topology_get_count(topology) != 3) {
ast_test_status_update(test, "Unexpected topology count '%d'. Expecting 2\n",
ast_stream_topology_get_count(topology));
res = AST_TEST_FAIL;
@@ -584,6 +613,12 @@ AST_TEST_DEFINE(sdp_to_topology)
goto end;
}
if (validate_formats(test, topology, 2, AST_MEDIA_TYPE_IMAGE,
ARRAY_LEN(expected_image_formats), expected_image_formats)) {
res = AST_TEST_FAIL;
goto end;
}
end:
ast_sdp_state_free(sdp_state);
ast_stream_topology_free(topology);