res_format_attr_ilbc.c File Reference

iLBC format attribute interface More...

#include "asterisk.h"
#include <ctype.h>
#include "asterisk/module.h"
#include "asterisk/format.h"
#include "asterisk/strings.h"
#include "asterisk/utils.h"
#include "asterisk/ilbc.h"

Include dependency graph for res_format_attr_ilbc.c:

Go to the source code of this file.

Functions
static void	__reg_module (void)
static void	__unreg_module (void)
struct ast_module *	AST_MODULE_SELF_SYM (void)
static int	ilbc_clone (const struct ast_format *src, struct ast_format *dst)
static void	ilbc_destroy (struct ast_format *format)
static void	ilbc_generate_sdp_fmtp (const struct ast_format *format, unsigned int payload, struct ast_str **str)
static struct ast_format *	ilbc_getjoint (const struct ast_format *format1, const struct ast_format *format2)
static struct ast_format *	ilbc_parse_sdp_fmtp (const struct ast_format *format, const char *attributes)
static int	load_module (void)
static int	unload_module (void)

Variables
static struct ast_module_info	__mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_LOAD_ORDER , .description = "iLBC Format Attribute Module" , .key = "This paragraph is copyright (c) 2006 by Digium, Inc. \In order for your module to load, it must return this \key via a function called \"key\". Any code which \includes this paragraph must be licensed under the GNU \General Public License version 2 or later (at your \option). In addition to Digium's general reservations \of rights, Digium expressly reserves the right to \allow other parties to license this paragraph under \different terms. Any use of Digium, Inc. trademarks or \logos (including \"Asterisk\" or \"Digium\") without \express written permission of Digium, Inc. is prohibited.\n" , .buildopt_sum = AST_BUILDOPT_SUM, .support_level = AST_MODULE_SUPPORT_CORE, .load = load_module, .unload = unload_module, .load_pri = AST_MODPRI_CHANNEL_DEPEND, }
static const struct ast_module_info *	ast_module_info = &__mod_info
static struct ilbc_attr	default_ilbc_attr
static struct ast_format_interface	ilbc_interface

Detailed Description

iLBC format attribute interface

Author

Alexander Traud pabst.nosp@m.raud.nosp@m.@comp.nosp@m.user.nosp@m.ve.co.nosp@m.m

Note

http://tools.ietf.org/html/rfc3952

Definition in file res_format_attr_ilbc.c.

Function Documentation

__reg_module()

static void __reg_module ( void  )

static

Definition at line 179 of file res_format_attr_ilbc.c.

__unreg_module()

static void __unreg_module ( void  )

static

Definition at line 179 of file res_format_attr_ilbc.c.

AST_MODULE_SELF_SYM()

struct ast_module * AST_MODULE_SELF_SYM

(

void

)

Definition at line 179 of file res_format_attr_ilbc.c.

ilbc_clone()

static int ilbc_clone ( const struct ast_format *  src, struct ast_format *  dst  )

static

Definition at line 54 of file res_format_attr_ilbc.c.

{
    struct ilbc_attr *original = ast_format_get_attribute_data(src);
    struct ilbc_attr *attr = ast_malloc(sizeof(*attr));
 
    if (!attr) {
        return -1;
    }
 
    if (original) {
        *attr = *original;
    } else {
        *attr = default_ilbc_attr;
    }
 
    ast_format_set_attribute_data(dst, attr);
 
    return 0;
}

References ast_format_get_attribute_data(), ast_format_set_attribute_data(), ast_malloc, and default_ilbc_attr.

ilbc_destroy()

static void ilbc_destroy ( struct ast_format *  format )

static

Definition at line 47 of file res_format_attr_ilbc.c.

{
    struct ilbc_attr *attr = ast_format_get_attribute_data(format);
 
    ast_free(attr);
}

References ast_format_get_attribute_data(), and ast_free.

ilbc_generate_sdp_fmtp()

static void ilbc_generate_sdp_fmtp ( const struct ast_format *  format, unsigned int  payload, struct ast_str **  str  )

static

Definition at line 102 of file res_format_attr_ilbc.c.

{
    struct ilbc_attr *attr = ast_format_get_attribute_data(format);
 
    if (!attr) {
        attr = &default_ilbc_attr;
    }
 
    /* When the VoIP/SIP client Zoiper calls Asterisk and its
     * iLBC 20 is disabled but iLBC 30 enabled, Zoiper still
     * falls back to iLBC 20, when there is no mode=30 in the
     * answer. Consequently, Zoiper defaults to iLBC 20. To
     * make that client happy, Asterisk sends mode always.
     * tested in June 2016, Zoiper Premium 1.13.2 for iPhone
     */
    /* if (attr->mode != 30) */ {
        ast_str_append(str, 0, "a=fmtp:%u mode=%u\r\n", payload, attr->mode);
    }
}

References ast_format_get_attribute_data(), ast_str_append(), default_ilbc_attr, ilbc_attr::mode, and str.

ilbc_getjoint()

static struct ast_format * ilbc_getjoint ( const struct ast_format *  format1, const struct ast_format *  format2  )

static

Definition at line 122 of file res_format_attr_ilbc.c.

{
    struct ast_format *jointformat;
    struct ilbc_attr *attr1 = ast_format_get_attribute_data(format1);
    struct ilbc_attr *attr2 = ast_format_get_attribute_data(format2);
    struct ilbc_attr *attr_res;
 
    if (!attr1) {
        attr1 = &default_ilbc_attr;
    }
 
    if (!attr2) {
        attr2 = &default_ilbc_attr;
    }
 
    jointformat = ast_format_clone(format1);
    if (!jointformat) {
        return NULL;
    }
    attr_res = ast_format_get_attribute_data(jointformat);
 
    if (attr1->mode != attr2->mode) {
        attr_res->mode = 30;
    }
 
    return jointformat;
}

References ast_format_clone(), ast_format_get_attribute_data(), default_ilbc_attr, ilbc_attr::mode, and NULL.

ilbc_parse_sdp_fmtp()

static struct ast_format * ilbc_parse_sdp_fmtp ( const struct ast_format *  format, const char *  attributes  )

static

Definition at line 74 of file res_format_attr_ilbc.c.

{
    char *attribs = ast_strdupa(attributes), *attrib;
    struct ast_format *cloned;
    struct ilbc_attr *attr;
    const char *kvp;
    unsigned int val;
 
    cloned = ast_format_clone(format);
    if (!cloned) {
        return NULL;
    }
    attr = ast_format_get_attribute_data(cloned);
 
    /* lower-case everything, so we are case-insensitive */
    for (attrib = attribs; *attrib; ++attrib) {
        *attrib = tolower(*attrib);
    } /* based on channels/chan_sip.c:process_a_sdp_image() */
 
    if ((kvp = strstr(attribs, "mode")) && sscanf(kvp, "mode=%30u", &val) == 1) {
        attr->mode = val;
    } else {
        attr->mode = 30; /* optional attribute; 30 is default value */
    }
 
    return cloned;
}

References ast_format_clone(), ast_format_get_attribute_data(), ast_strdupa, ilbc_attr::mode, and NULL.

load_module()

static int load_module ( void  )

static

Definition at line 160 of file res_format_attr_ilbc.c.

{
    if (ast_format_interface_register("ilbc", &ilbc_interface)) {
        return AST_MODULE_LOAD_DECLINE;
    }
 
    return AST_MODULE_LOAD_SUCCESS;
}

References ast_format_interface_register, AST_MODULE_LOAD_DECLINE, AST_MODULE_LOAD_SUCCESS, and ilbc_interface.

unload_module()

static int unload_module ( void  )

static

Definition at line 169 of file res_format_attr_ilbc.c.

{
    return 0;
}

Variable Documentation

__mod_info

struct ast_module_info __mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_LOAD_ORDER , .description = "iLBC Format Attribute Module" , .key = "This paragraph is copyright (c) 2006 by Digium, Inc. \In order for your module to load, it must return this \key via a function called \"key\". Any code which \includes this paragraph must be licensed under the GNU \General Public License version 2 or later (at your \option). In addition to Digium's general reservations \of rights, Digium expressly reserves the right to \allow other parties to license this paragraph under \different terms. Any use of Digium, Inc. trademarks or \logos (including \"Asterisk\" or \"Digium\") without \express written permission of Digium, Inc. is prohibited.\n" , .buildopt_sum = AST_BUILDOPT_SUM, .support_level = AST_MODULE_SUPPORT_CORE, .load = load_module, .unload = unload_module, .load_pri = AST_MODPRI_CHANNEL_DEPEND, }

static

Definition at line 179 of file res_format_attr_ilbc.c.

ast_module_info

const struct ast_module_info* ast_module_info = &__mod_info

static

Definition at line 179 of file res_format_attr_ilbc.c.

default_ilbc_attr

struct ilbc_attr default_ilbc_attr

static

Initial value:

= {
    .mode = 20,
}

Definition at line 43 of file res_format_attr_ilbc.c.

Referenced by ilbc_clone(), ilbc_generate_sdp_fmtp(), and ilbc_getjoint().

ilbc_interface

struct ast_format_interface ilbc_interface

static

Definition at line 150 of file res_format_attr_ilbc.c.

Referenced by load_module().