forked from osmocom/wireshark
123 lines
3.8 KiB
C
123 lines
3.8 KiB
C
/* rtp_media.c
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*
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* RTP decoding routines for Wireshark.
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* Copied from ui/gtk/rtp_player.c
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*
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* Copyright 2006, Alejandro Vaquero <alejandrovaquero@yahoo.com>
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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 1999 Gerald Combs
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include "config.h"
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#include <wsutil/codecs.h>
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#include <epan/rtp_pt.h>
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#include <epan/dissectors/packet-rtp.h>
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#include <ui/rtp_media.h>
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/****************************************************************************/
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/* DECODING */
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/****************************************************************************/
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typedef struct _rtp_decoder_t {
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codec_handle_t handle;
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void *context;
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} rtp_decoder_t;
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/****************************************************************************/
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/*
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* Return the number of decoded bytes
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*/
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size_t
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decode_rtp_packet_payload(guint8 payload_type, const gchar *payload_type_str, guint8 *payload_data, size_t payload_len, SAMPLE **out_buff, GHashTable *decoders_hash, guint *channels_ptr, guint *sample_rate_ptr)
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{
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const gchar *p;
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rtp_decoder_t *decoder;
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SAMPLE *tmp_buff = NULL;
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size_t tmp_buff_len;
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size_t decoded_bytes = 0;
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/* Look for registered codecs */
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decoder = (rtp_decoder_t *)g_hash_table_lookup(decoders_hash, GUINT_TO_POINTER(payload_type));
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if (!decoder) { /* Put either valid or empty decoder into the hash table */
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decoder = g_new(rtp_decoder_t,1);
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decoder->handle = NULL;
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decoder->context = NULL;
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if (payload_type_str && find_codec(payload_type_str)) {
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p = payload_type_str;
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} else {
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p = try_val_to_str_ext(payload_type, &rtp_payload_type_short_vals_ext);
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}
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if (p) {
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decoder->handle = find_codec(p);
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if (decoder->handle)
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decoder->context = codec_init(decoder->handle);
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}
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g_hash_table_insert(decoders_hash, GUINT_TO_POINTER(payload_type), decoder);
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}
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if (decoder->handle) { /* Decode with registered codec */
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/* if output == NULL and outputSizeBytes == NULL => ask for expected size of the buffer */
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tmp_buff_len = codec_decode(decoder->handle, decoder->context, payload_data, payload_len, NULL, NULL);
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tmp_buff = (SAMPLE *)g_malloc(tmp_buff_len);
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decoded_bytes = codec_decode(decoder->handle, decoder->context, payload_data, payload_len, tmp_buff, &tmp_buff_len);
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*out_buff = tmp_buff;
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if (channels_ptr) {
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*channels_ptr = codec_get_channels(decoder->handle, decoder->context);
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}
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if (sample_rate_ptr) {
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*sample_rate_ptr = codec_get_frequency(decoder->handle, decoder->context);
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}
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return decoded_bytes;
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}
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*out_buff = NULL;
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return 0;
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}
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/****************************************************************************/
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/*
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* @return Number of decoded bytes
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*/
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size_t
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decode_rtp_packet(rtp_packet_t *rp, SAMPLE **out_buff, GHashTable *decoders_hash, guint *channels_ptr, guint *sample_rate_ptr)
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{
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guint8 payload_type;
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if ((rp->payload_data == NULL) || (rp->info->info_payload_len == 0) ) {
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return 0;
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}
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payload_type = rp->info->info_payload_type;
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return decode_rtp_packet_payload(payload_type, rp->info->info_payload_type_str, rp->payload_data, rp->info->info_payload_len, out_buff, decoders_hash, channels_ptr, sample_rate_ptr);
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}
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/****************************************************************************/
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static void
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rtp_decoder_value_destroy(gpointer dec_arg)
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{
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rtp_decoder_t *dec = (rtp_decoder_t *)dec_arg;
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if (dec->handle)
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codec_release(dec->handle, dec->context);
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g_free(dec_arg);
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}
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GHashTable *rtp_decoder_hash_table_new(void)
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{
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return g_hash_table_new_full(g_direct_hash, g_direct_equal, NULL, rtp_decoder_value_destroy);
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}
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