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/* codecs.c
* codecs interface 2007 Tomas Kukosa
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "config.h"
#include "codecs.h"
#include <wsutil/wslog.h>
#ifdef HAVE_PLUGINS
#include <wsutil/plugins.h>
#endif
#ifdef HAVE_PLUGINS
static plugins_t *libwscodecs_plugins = NULL;
#endif
static GSList *codecs_plugins = NULL;
#ifdef HAVE_PLUGINS
void
codecs_register_plugin(const codecs_plugin *plug)
{
codecs_plugins = g_slist_prepend(codecs_plugins, (codecs_plugin *)plug);
}
#else /* HAVE_PLUGINS */
void
codecs_register_plugin(const codecs_plugin *plug _U_)
{
ws_warning("codecs_register_plugin: built without support for binary plugins");
}
#endif /* HAVE_PLUGINS */
static void
call_plugin_register_codec_module(void * data, void * user_data _U_)
{
codecs_plugin *plug = (codecs_plugin *)data;
if (plug->register_codec_module) {
plug->register_codec_module();
}
}
/*
* For all codec plugins, call their register routines.
*/
void
codecs_init(void)
{
#ifdef HAVE_PLUGINS
libwscodecs_plugins = plugins_init(WS_PLUGIN_CODEC);
#endif
g_slist_foreach(codecs_plugins, call_plugin_register_codec_module, NULL);
}
void
codecs_cleanup(void)
{
g_slist_free(codecs_plugins);
codecs_plugins = NULL;
#ifdef HAVE_PLUGINS
plugins_cleanup(libwscodecs_plugins);
libwscodecs_plugins = NULL;
#endif
}
struct codec_handle {
const char *name;
codec_init_fn init_fn;
codec_release_fn release_fn;
codec_get_channels_fn channels_fn;
codec_get_frequency_fn frequency_fn;
codec_decode_fn decode_fn;
};
/*
* List of registered codecs.
*/
static GHashTable *registered_codecs = NULL;
/* Find a registered codec by name. */
codec_handle_t
find_codec(const char *name)
{
codec_handle_t ret;
char *key = g_ascii_strup(name, -1);
ret = (registered_codecs) ? (codec_handle_t)g_hash_table_lookup(registered_codecs, key) : NULL;
g_free(key);
return ret;
}
/* Register a codec by name. */
bool
register_codec(const char *name, codec_init_fn init_fn, codec_release_fn release_fn,
codec_get_channels_fn channels_fn, codec_get_frequency_fn frequency_fn,
codec_decode_fn decode_fn)
{
struct codec_handle *handle;
char *key;
/* Create our hash table if it doesn't already exist */
if (registered_codecs == NULL)
registered_codecs = g_hash_table_new_full(g_str_hash, g_str_equal, g_free, g_free);
/* RFC 4855 3. Mapping to SDP Parameters "Note that the payload format
* (encoding) names... are commonly shown in upper case. These names
* are case-insensitive in both places."
*/
key = g_ascii_strup(name, -1);
/* Make sure the registration is unique */
if (g_hash_table_lookup(registered_codecs, key) != NULL) {
g_free(key);
return false; /* report an error, or have our caller do it? */
}
handle = g_new(struct codec_handle, 1);
handle->name = name;
handle->init_fn = init_fn;
handle->release_fn = release_fn;
handle->channels_fn = channels_fn;
handle->frequency_fn = frequency_fn;
handle->decode_fn = decode_fn;
g_hash_table_insert(registered_codecs, (void *)key, (void *) handle);
return true;
}
/* Deregister a codec by name. */
bool
deregister_codec(const char *name)
{
bool ret = false;
if (registered_codecs) {
char *key = g_ascii_strup(name, -1);
ret = g_hash_table_remove(registered_codecs, key);
g_free(key);
}
return ret;
}
void *codec_init(codec_handle_t codec, codec_context_t *context)
{
if (!codec) return NULL;
return (codec->init_fn)(context);
}
void codec_release(codec_handle_t codec, codec_context_t *context)
{
if (!codec) return;
(codec->release_fn)(context);
}
unsigned codec_get_channels(codec_handle_t codec, codec_context_t *context)
{
if (!codec) return 0;
return (codec->channels_fn)(context);
}
unsigned codec_get_frequency(codec_handle_t codec, codec_context_t *context)
{
if (!codec) return 0;
return (codec->frequency_fn)(context);
}
size_t codec_decode(codec_handle_t codec, codec_context_t *context, const void *input, size_t inputSizeBytes, void *output, size_t *outputSizeBytes)
{
if (!codec) return 0;
return (codec->decode_fn)(context, input, inputSizeBytes, output, outputSizeBytes);
}
/*
* Editor modelines - https://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 4
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* vi: set shiftwidth=4 tabstop=8 expandtab:
* :indentSize=4:tabSize=8:noTabs=true:
*/
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