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Add support for parsing SDP attributes, generating SDP attributes, and passing it through.

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This support includes codecs such as H.263, H.264, SILK, and CELT. You are able to set up a call and have attribute information pass. This should help considerably with video calls.

Review: https://reviewboard.asterisk.org/r/2005/


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@370055 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Joshua Colp
2012-07-13 16:49:40 +00:00
parent 2603707f30
commit a693fd1d87
6 changed files with 180 additions and 41 deletions
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40
include/asterisk/format.h
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@@ -131,7 +131,7 @@ enum ast_format_id {
/*! \brief This structure contains the buffer used for format attributes */
struct ast_format_attr {
/*! The buffer formats can use to represent attributes */
uint8_t format_attr[AST_FORMAT_ATTR_SIZE];
uint32_t format_attr[AST_FORMAT_ATTR_SIZE];
/*! If a format's payload needs to pass through that a new marker is required
* for RTP, this variable will be set. */
uint8_t rtp_marker_bit;
@@ -219,8 +219,46 @@ struct ast_format_attr_interface {
* \retval -1 failure, Value was either not found, or not allowed to be accessed.
*/
int (* const format_attr_get_val)(const struct ast_format_attr *format_attr, int key, void *val);
/*
* \brief Parse SDP attribute information, interpret it, and store it in ast_format_attr structure.
*
* \retval 0 Success, values were valid
* \retval -1 Failure, some values were not acceptable
*/
int (* const format_attr_sdp_parse)(struct ast_format_attr *format_attr, const char *attributes);
/*!
* \brief Generate SDP attribute information from an ast_format_attr structure.
*
* \note This callback should generate a full fmtp line using the provided payload number.
*/
void (* const format_attr_sdp_generate)(const struct ast_format_attr *format_attr, unsigned int payload, struct ast_str **str);
};
/*!
* \brief This function is used to have a media format aware module parse and interpret
* SDP attribute information. Once interpreted this information is stored on the format
* itself using Asterisk format attributes.
*
* \param format to set
* \param attributes string containing the fmtp line from the SDP
*
* \retval 0 success, attribute values were valid
* \retval -1 failure, values were not acceptable
*/
int ast_format_sdp_parse(struct ast_format *format, const char *attributes);
/*!
* \brief This function is used to produce an fmtp SDP line for an Asterisk format. The
* attributes present on the Asterisk format are translated into the SDP equivalent.
*
* \param format to generate an fmtp line for
* \param payload numerical payload for the fmtp line
* \param str structure that the fmtp line will be appended to
*/
void ast_format_sdp_generate(const struct ast_format *format, unsigned int payload, struct ast_str **str);
/*!
* \brief This function is used to set an ast_format object to represent a media format
* with optional format attributes represented by format specific key value pairs.