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/* rtp_media.c
*
* RTP decoding routines for Wireshark.
* Copied from ui/gtk/rtp_player.c
*
* Copyright 2006, Alejandro Vaquero <alejandrovaquero@yahoo.com>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1999 Gerald Combs
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#include <codecs/codecs.h>
#include <epan/rtp_pt.h>
#include <epan/dissectors/packet-rtp.h>
#include <ui/rtp_media.h>
/****************************************************************************/
/* DECODING */
/****************************************************************************/
typedef struct _rtp_decoder_t {
codec_handle_t handle;
void *context;
} rtp_decoder_t;
/****************************************************************************/
/*
* Return the number of decoded bytes
*/
size_t
decode_rtp_packet(rtp_packet_t *rp, SAMPLE **out_buff, GHashTable *decoders_hash, unsigned *channels_ptr, unsigned *sample_rate_ptr)
{
unsigned int payload_type;
const gchar *p;
rtp_decoder_t *decoder;
SAMPLE *tmp_buff = NULL;
size_t tmp_buff_len;
size_t decoded_bytes = 0;
if ((rp->payload_data == NULL) || (rp->info->info_payload_len == 0) ) {
return 0;
}
payload_type = rp->info->info_payload_type;
/* Look for registered codecs */
decoder = (rtp_decoder_t *)g_hash_table_lookup(decoders_hash, GUINT_TO_POINTER(payload_type));
if (!decoder) { /* Put either valid or empty decoder into the hash table */
decoder = g_new(rtp_decoder_t,1);
decoder->handle = NULL;
decoder->context = NULL;
if (rp->info->info_payload_type_str && find_codec(rp->info->info_payload_type_str)) {
p = rp->info->info_payload_type_str;
} else {
p = try_val_to_str_ext(payload_type, &rtp_payload_type_short_vals_ext);
}
if (p) {
decoder->handle = find_codec(p);
if (decoder->handle)
decoder->context = codec_init(decoder->handle);
}
g_hash_table_insert(decoders_hash, GUINT_TO_POINTER(payload_type), decoder);
}
if (decoder->handle) { /* Decode with registered codec */
tmp_buff_len = codec_decode(decoder->handle, decoder->context, rp->payload_data, rp->info->info_payload_len, NULL, NULL);
tmp_buff = (SAMPLE *)g_malloc(tmp_buff_len);
decoded_bytes = codec_decode(decoder->handle, decoder->context, rp->payload_data, rp->info->info_payload_len, tmp_buff, &tmp_buff_len);
*out_buff = tmp_buff;
if (channels_ptr) {
*channels_ptr = codec_get_channels(decoder->handle, decoder->context);
}
if (sample_rate_ptr) {
*sample_rate_ptr = codec_get_frequency(decoder->handle, decoder->context);
}
return decoded_bytes;
}
*out_buff = NULL;
return 0;
}
/****************************************************************************/
static void
rtp_decoder_value_destroy(gpointer dec_arg)
{
rtp_decoder_t *dec = (rtp_decoder_t *)dec_arg;
if (dec->handle)
codec_release(dec->handle, dec->context);
g_free(dec_arg);
}
GHashTable *rtp_decoder_hash_table_new(void)
{
return g_hash_table_new_full(g_direct_hash, g_direct_equal, NULL, rtp_decoder_value_destroy);
}
/*
* Editor modelines - http://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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