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 = ASTERISK_GPL_KEY , .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 = ASTERISK_GPL_KEY , .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.

                                            {
    .mode = 20,
};

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.

                                                    {
    .format_destroy = ilbc_destroy,
    .format_clone = ilbc_clone,
    .format_cmp = NULL,
    .format_get_joint = ilbc_getjoint,
    .format_attribute_set = NULL,
    .format_parse_sdp_fmtp = ilbc_parse_sdp_fmtp,
    .format_generate_sdp_fmtp = ilbc_generate_sdp_fmtp,
};

Referenced by load_module().