diff options
author | Mark Michelson <mmichelson@digium.com> | 2017-02-15 14:43:36 -0600 |
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committer | Mark Michelson <mmichelson@digium.com> | 2017-02-21 15:14:34 -0600 |
commit | a738772edd5279b1d0bfd3b49bb4cc6c010db5d1 (patch) | |
tree | 1e2a6126b11f500ab9dd1403a860924d1c5c7933 /main/sdp_state.c | |
parent | 5a130b2e1730467cd209d3b3c929ff5f24a2aa02 (diff) |
Add initial SDP state code.
This establishes the basic allocation/destruction of an SDP state
object, plus some of the simpler getter methods involved. Subsequent
tasks will deal with adding a state machine, creating SDPs from
capabilities and options, and merging SDPs into a joint SDP.
Change-Id: Ie3757ce186f04b65e9d1883f5aace53f24e53709
Diffstat (limited to 'main/sdp_state.c')
-rw-r--r-- | main/sdp_state.c | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/main/sdp_state.c b/main/sdp_state.c new file mode 100644 index 000000000..04de6e385 --- /dev/null +++ b/main/sdp_state.c @@ -0,0 +1,107 @@ +/* + * Asterisk -- An open source telephony toolkit. + * + * Copyright (C) 2017, Digium, Inc. + * + * Mark Michelson <mmichelson@digium.com> + * + * See http://www.asterisk.org for more information about + * the Asterisk project. Please do not directly contact + * any of the maintainers of this project for assistance; + * the project provides a web site, mailing lists and IRC + * channels for your use. + * + * This program is free software, distributed under the terms of + * the GNU General Public License Version 2. See the LICENSE file + * at the top of the source tree. + */ + +#include "asterisk.h" +#include "asterisk/sdp_state.h" +#include "asterisk/sdp_options.h" +#include "asterisk/sdp_translator.h" +#include "asterisk/sdp_priv.h" +#include "asterisk/vector.h" +#include "asterisk/utils.h" +#include "asterisk/stream.h" + +struct ast_sdp_state { + /*! Local capabilities, learned through configuration */ + struct ast_stream_topology *local_capabilities; + /*! Remote capabilities, learned through remote SDP */ + struct ast_stream_topology *remote_capabilities; + /*! Joint capabilities. The combined local and remote capabilities. */ + struct ast_stream_topology *joint_capabilities; + /*! Local SDP. Generated via the options and local capabilities. */ + struct ast_sdp *local_sdp; + /*! Remote SDP. Received directly from a peer. */ + struct ast_sdp *remote_sdp; + /*! Joint SDP. The merged local and remote SDPs. */ + struct ast_sdp *joint_sdp; + /*! SDP options. Configured options beyond media capabilities. */ + struct ast_sdp_options *options; + /*! Translator that puts SDPs into the expected representation */ + struct ast_sdp_translator *translator; + /*! RTP instance for each media stream */ + AST_VECTOR(, struct ast_rtp_instance *) rtp; +}; + +struct ast_sdp_state *ast_sdp_state_alloc(struct ast_stream_topology *streams, struct ast_sdp_options *options) +{ + struct ast_sdp_state *sdp_state; + + sdp_state = ast_calloc(1, sizeof(*sdp_state)); + if (!sdp_state) { + return NULL; + } + + sdp_state->options = options; + + sdp_state->translator = ast_sdp_translator_new(ast_sdp_options_get_repr(sdp_state->options)); + if (!sdp_state->translator) { + ast_sdp_state_free(sdp_state); + return NULL; + } + + sdp_state->local_capabilities = ast_stream_topology_clone(streams); + if (!sdp_state->local_capabilities) { + ast_sdp_state_free(sdp_state); + return NULL; + } + + return sdp_state; +} + +void ast_sdp_state_free(struct ast_sdp_state *sdp_state) +{ + if (!sdp_state) { + return; + } + + ast_stream_topology_free(sdp_state->local_capabilities); + ast_stream_topology_free(sdp_state->remote_capabilities); + ast_stream_topology_free(sdp_state->joint_capabilities); + ast_sdp_free(sdp_state->local_sdp); + ast_sdp_free(sdp_state->remote_sdp); + ast_sdp_free(sdp_state->joint_sdp); + ast_sdp_options_free(sdp_state->options); + ast_sdp_translator_free(sdp_state->translator); +} + +struct ast_rtp_instance *ast_sdp_state_get_rtp_instance(struct ast_sdp_state *sdp_state, int stream_index) +{ + if (stream_index >= AST_VECTOR_SIZE(&sdp_state->rtp)) { + return NULL; + } + + return AST_VECTOR_GET(&sdp_state->rtp, stream_index); +} + +struct ast_stream_topology *ast_sdp_state_get_joint_topology(struct ast_sdp_state *sdp_state) +{ + if (sdp_state->joint_capabilities) { + return sdp_state->joint_capabilities; + } else { + return sdp_state->local_capabilities; + } +} |