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codecs: Fix ABI incompatibility created by adding format_name to ast_codec

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Adding format_name even to the end of ast_codec caused issued with
binary codec modules because the pointer would be garbage in asterisk
when they registered.  So, the ast_codec structure was reverted and an
internal_ast_codec structure was created just for use in codec.c.  A new
internal-only API was also added (__ast_codec_register_with_format) so
that codec_builtin could register codecs with the format_name in a
separate parameter rather than in the ast_codec structure.

ASTERISK-26144 #close
Reported-by: Alexei Gradinari

Change-Id: I6df1b08f6a6ae089db23adfe1ebc8636330265ba
This commit is contained in:
George Joseph
2016-06-28 08:00:32 -06:00
parent 541f038694
commit 4045e6d8ba
3 changed files with 52 additions and 21 deletions
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62
main/codec.c
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@@ -49,6 +49,32 @@ static int codec_id = 1;
/*! \brief Registered codecs */
static struct ao2_container *codecs;
/*!
* \internal
* \brief Internal codec structure
*
* External codecs won't know about the format_name field so the public
* ast_codec structure has to leave it out. This structure will be used
* for the internal codecs.
*
*/
struct internal_ast_codec {
/*! \brief Public codec structure. Must remain first. */
struct ast_codec external;
/*! \brief A format name for a default sane format using this codec */
const char *format_name;
};
/*!
* \internal
* \brief Internal function for registration with format name
*
* This function is only used by codec.c and codec_builtin.c and
* will be removed in Asterisk 14
*/
int __ast_codec_register_with_format(struct ast_codec *codec, const char *format_name,
struct ast_module *mod);
static int codec_hash(const void *obj, int flags)
{
const struct ast_codec *codec;
@@ -113,7 +139,7 @@ static int codec_cmp(void *obj, void *arg, int flags)
static char *show_codecs(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
struct ao2_iterator i;
struct ast_codec *codec;
struct internal_ast_codec *codec;
switch (cmd) {
case CLI_INIT:
@@ -144,19 +170,19 @@ static char *show_codecs(struct ast_cli_entry *e, int cmd, struct ast_cli_args *
for (; (codec = ao2_iterator_next(&i)); ao2_ref(codec, -1)) {
if (a->argc == 4) {
if (!strcasecmp(a->argv[3], "audio")) {
if (codec->type != AST_MEDIA_TYPE_AUDIO) {
if (codec->external.type != AST_MEDIA_TYPE_AUDIO) {
continue;
}
} else if (!strcasecmp(a->argv[3], "video")) {
if (codec->type != AST_MEDIA_TYPE_VIDEO) {
if (codec->external.type != AST_MEDIA_TYPE_VIDEO) {
continue;
}
} else if (!strcasecmp(a->argv[3], "image")) {
if (codec->type != AST_MEDIA_TYPE_IMAGE) {
if (codec->external.type != AST_MEDIA_TYPE_IMAGE) {
continue;
}
} else if (!strcasecmp(a->argv[3], "text")) {
if (codec->type != AST_MEDIA_TYPE_TEXT) {
if (codec->external.type != AST_MEDIA_TYPE_TEXT) {
continue;
}
} else {
@@ -165,11 +191,11 @@ static char *show_codecs(struct ast_cli_entry *e, int cmd, struct ast_cli_args *
}
ast_cli(a->fd, "%8u %-5s %-12s %-16s (%s)\n",
codec->id,
ast_codec_media_type2str(codec->type),
codec->name,
codec->external.id,
ast_codec_media_type2str(codec->external.type),
codec->external.name,
S_OR(codec->format_name, "no cached format"),
codec->description);
codec->external.description);
}
ao2_iterator_destroy(&i);
@@ -190,7 +216,7 @@ static int codec_id_cmp(void *obj, void *arg, int flags)
static char *show_codec(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
int type_punned_codec;
struct ast_codec *codec;
struct internal_ast_codec *codec;
switch (cmd) {
case CLI_INIT:
@@ -217,7 +243,7 @@ static char *show_codec(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a
return CLI_SUCCESS;
}
ast_cli(a->fd, "%11u %s (%s)\n", (unsigned int) codec->id, codec->description,
ast_cli(a->fd, "%11u %s (%s)\n", (unsigned int) codec->external.id, codec->external.description,
S_OR(codec->format_name, "no format"));
ao2_ref(codec, -1);
@@ -262,9 +288,14 @@ static void codec_dtor(void *obj)
}
int __ast_codec_register(struct ast_codec *codec, struct ast_module *mod)
{
return __ast_codec_register_with_format(codec, NULL, mod);
}
int __ast_codec_register_with_format(struct ast_codec *codec, const char *format_name, struct ast_module *mod)
{
SCOPED_AO2WRLOCK(lock, codecs);
struct ast_codec *codec_new;
struct internal_ast_codec *codec_new;
/* Some types have specific requirements */
if (codec->type == AST_MEDIA_TYPE_UNKNOWN) {
@@ -293,8 +324,9 @@ int __ast_codec_register(struct ast_codec *codec, struct ast_module *mod)
codec->name, ast_codec_media_type2str(codec->type), codec->sample_rate);
return -1;
}
*codec_new = *codec;
codec_new->id = codec_id++;
codec_new->external = *codec;
codec_new->format_name = format_name;
codec_new->external.id = codec_id++;
ao2_link_flags(codecs, codec_new, OBJ_NOLOCK);
@@ -302,7 +334,7 @@ int __ast_codec_register(struct ast_codec *codec, struct ast_module *mod)
ast_module_shutdown_ref(mod);
ast_verb(2, "Registered '%s' codec '%s' at sample rate '%u' with id '%u'\n",
ast_codec_media_type2str(codec->type), codec->name, codec->sample_rate, codec_new->id);
ast_codec_media_type2str(codec->type), codec->name, codec->sample_rate, codec_new->external.id);
ao2_ref(codec_new, -1);