forked from osmocom/wireshark
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Change-Id: I83ecc7e4f8c827c83c2f6b62918f042d023daee4 Reviewed-on: https://code.wireshark.org/review/13575 Reviewed-by: Alexis La Goutte <alexis.lagoutte@gmail.com> Petri-Dish: Alexis La Goutte <alexis.lagoutte@gmail.com> Reviewed-by: Pascal Quantin <pascal.quantin@gmail.com> Petri-Dish: Pascal Quantin <pascal.quantin@gmail.com> Tested-by: Petri Dish Buildbot <buildbot-no-reply@wireshark.org> Reviewed-by: Michael Mann <mmann78@netscape.net>
228 lines
6.1 KiB
C
228 lines
6.1 KiB
C
/* codecs.c
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* codecs interface 2007 Tomas Kukosa
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include <glib.h>
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#include "codecs.h"
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#include "G711a/G711adecode.h"
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#include "G711u/G711udecode.h"
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#ifdef HAVE_SBC
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#include "sbc/sbc_private.h"
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#endif
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#ifdef HAVE_PLUGINS
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#include <gmodule.h>
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#include <wsutil/plugins.h>
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/*
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* List of codec plugins.
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*/
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typedef struct {
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void (*register_codec_module)(void); /* routine to call to register a codec */
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} codec_plugin;
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static GSList *codec_plugins = NULL;
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/*
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* Callback for each plugin found.
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*/
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static gboolean
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check_for_codec_plugin(GModule *handle)
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{
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gpointer gp;
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void (*register_codec_module)(void);
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codec_plugin *plugin;
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/*
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* Do we have a register_codec_module routine?
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*/
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if (!g_module_symbol(handle, "register_codec_module", &gp)) {
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/* No, so this isn't a codec plugin. */
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return FALSE;
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}
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/*
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* Yes - this plugin includes one or more codecs.
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*/
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register_codec_module = (void (*)(void))gp;
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/*
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* Add this one to the list of codec plugins.
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*/
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plugin = (codec_plugin *)g_malloc(sizeof (codec_plugin));
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plugin->register_codec_module = register_codec_module;
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codec_plugins = g_slist_append(codec_plugins, plugin);
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return TRUE;
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}
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void
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codec_register_plugin_types(void)
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{
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add_plugin_type("codec", check_for_codec_plugin);
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}
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static void
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register_codec_plugin(gpointer data, gpointer user_data _U_)
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{
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codec_plugin *plugin = (codec_plugin *)data;
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(plugin->register_codec_module)();
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}
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/*
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* For all codec plugins, call their register routines.
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*/
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void
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register_all_codecs(void)
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{
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register_codec("g711U", codec_g711u_init, codec_g711u_release,
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codec_g711u_get_channels, codec_g711u_get_frequency, codec_g711u_decode);
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register_codec("g711A", codec_g711a_init, codec_g711a_release,
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codec_g711a_get_channels, codec_g711a_get_frequency, codec_g711a_decode);
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#ifdef HAVE_SPANDSP
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register_codec("g722", codec_g722_init, codec_g722_release,
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codec_g722_get_channels, codec_g722_get_frequency, codec_g722_decode);
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register_codec("g726", codec_g726_init, codec_g726_release,
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codec_g726_get_channels, codec_g726_get_frequency, codec_g726_decode);
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#endif
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#ifdef HAVE_SBC
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register_codec("SBC", codec_sbc_init, codec_sbc_release,
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codec_sbc_get_channels, codec_sbc_get_frequency, codec_sbc_decode);
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#endif
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g_slist_foreach(codec_plugins, register_codec_plugin, NULL);
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}
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#endif /* HAVE_PLUGINS */
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struct codec_handle {
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const char *name;
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codec_init_fn init_fn;
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codec_release_fn release_fn;
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codec_get_channels_fn channels_fn;
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codec_get_frequency_fn frequency_fn;
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codec_decode_fn decode_fn;
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};
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/*
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* List of registered codecs.
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*/
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static GHashTable *registered_codecs = NULL;
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/* Find a registered codec by name. */
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codec_handle_t
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find_codec(const char *name)
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{
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return (registered_codecs) ? (codec_handle_t)g_hash_table_lookup(registered_codecs, name) : NULL;
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}
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/* Register a codec by name. */
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gboolean
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register_codec(const char *name, codec_init_fn init_fn, codec_release_fn release_fn,
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codec_get_channels_fn channels_fn, codec_get_frequency_fn frequency_fn,
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codec_decode_fn decode_fn)
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{
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struct codec_handle *handle;
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/* Create our hash table if it doesn't already exist */
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if (registered_codecs == NULL)
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registered_codecs = g_hash_table_new(g_str_hash, g_str_equal);
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/* Make sure the registration is unique */
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if (g_hash_table_lookup(registered_codecs, name) != NULL)
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return FALSE; /* report an error, or have our caller do it? */
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handle = (struct codec_handle *)g_malloc(sizeof (struct codec_handle));
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handle->name = name;
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handle->init_fn = init_fn;
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handle->release_fn = release_fn;
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handle->channels_fn = channels_fn;
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handle->frequency_fn = frequency_fn;
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handle->decode_fn = decode_fn;
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g_hash_table_insert(registered_codecs, (gpointer)name, (gpointer) handle);
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return TRUE;
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}
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/* Deregister a codec by name. */
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gboolean
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deregister_codec(const char *name)
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{
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gpointer key, value;
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if (registered_codecs && g_hash_table_lookup_extended(registered_codecs, name, &key, &value)) {
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g_hash_table_remove(registered_codecs, name);
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g_free(value);
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return TRUE;
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}
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return FALSE;
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}
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void *codec_init(codec_handle_t codec)
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{
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if (!codec) return NULL;
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return (codec->init_fn)();
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}
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void codec_release(codec_handle_t codec, void *context)
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{
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if (!codec) return;
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(codec->release_fn)(context);
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}
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unsigned codec_get_channels(codec_handle_t codec, void *context)
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{
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if (!codec) return 0;
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return (codec->channels_fn)(context);
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}
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unsigned codec_get_frequency(codec_handle_t codec, void *context)
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{
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if (!codec) return 0;
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return (codec->frequency_fn)(context);
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}
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size_t codec_decode(codec_handle_t codec, void *context, const void *input, size_t inputSizeBytes, void *output, size_t *outputSizeBytes)
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{
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if (!codec) return 0;
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return (codec->decode_fn)(context, input, inputSizeBytes, output, outputSizeBytes);
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}
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/*
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* Editor modelines - http://www.wireshark.org/tools/modelines.html
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*
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* Local variables:
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* c-basic-offset: 4
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* tab-width: 8
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* indent-tabs-mode: nil
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* End:
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*
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* vi: set shiftwidth=4 tabstop=8 expandtab:
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* :indentSize=4:tabSize=8:noTabs=true:
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*/
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