| c732d49e |
* Contact for licensing options: <licensing-mcpttclient(at)mcopenplatform(dot)com>
*
* The original file was part of Open Source Doubango Framework
* Copyright (C) 2010-2011 Mamadou Diop.
* Copyright (C) 2012 Doubango Telecom <http://doubango.org>
*
* This file is part of Open Source Doubango Framework.
*
* DOUBANGO 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 3 of the License, or
* (at your option) any later version.
*
* DOUBANGO 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 DOUBANGO.
*
*/
/**@file tdav_codec_red.c
* @brief RTP Payload for Redundant Audio Data as per RFC 2198
*/
#include "tinydav/codecs/fec/tdav_codec_red.h"
#include "tinyrtp/rtp/trtp_rtp_packet.h"
#include "tsk_memory.h"
#include "tsk_time.h"
#include "tsk_debug.h"
typedef struct tdav_codec_red_s
{
TMEDIA_DECLARE_CODEC_VIDEO;
tdav_codec_red_rtppacket_cb_f callback;
const void* callback_data;
}
tdav_codec_red_t;
int tdav_codec_red_set_callback(tdav_codec_red_t *self, tdav_codec_red_rtppacket_cb_f callback, const void* callback_data)
{
if(!self){
TSK_DEBUG_ERROR("Invalid parameter");
return -1;
}
self->callback = callback;
self->callback_data = callback_data;
return 0;
}
static int tdav_codec_red_open(tmedia_codec_t* self)
{
return 0;
}
static int tdav_codec_red_close(tmedia_codec_t* self)
{
return 0;
}
static tsk_size_t tdav_codec_red_encode(tmedia_codec_t* self, const void* in_data, tsk_size_t in_size, void** out_data, tsk_size_t* out_max_size)
{
tdav_codec_red_t *red = (tdav_codec_red_t *)self;
tsk_size_t xsize = (in_size + 1);
static const uint8_t __first_octet = 0x00; // F=1, PT=0. Up to the caller to update this first octet with the right PT.
if(!red || !in_data || !in_size || !out_data || !out_max_size){
TSK_DEBUG_ERROR("Invalid parameter");
return 0;
}
if(*out_max_size < xsize){
if(!(*out_data = tsk_realloc(*out_data, xsize))){
TSK_DEBUG_ERROR("Failed to realloc data");
*out_max_size = 0;
}
*out_max_size = xsize;
}
((uint8_t*)*out_data)[0] = __first_octet;
memcpy(&((uint8_t*)*out_data)[1], in_data, in_size);
return xsize;
}
static tsk_size_t tdav_codec_red_decode(tmedia_codec_t* self, const void* in_data, tsk_size_t in_size, void** out_data, tsk_size_t* out_max_size, const tsk_object_t* proto_hdr)
{
tdav_codec_red_t* red = (tdav_codec_red_t*)self;
const trtp_rtp_header_t* rtp_hdr = proto_hdr;
trtp_rtp_packet_t* red_rtp_pkt = tsk_null;
const uint8_t* pdata = in_data;
const uint8_t* red_hdr = in_data;
tsk_size_t red_hdrs_count, i;
tsk_bool_t last;
uint8_t F;
uint16_t timestamp_offset, block_length;
if(!red || !in_data || (in_size < TDAV_CODEC_RED_MIN_PKT_SIZE)|| !out_data){
TSK_DEBUG_ERROR("Invalid parameter");
return 0;
}
if(!red->callback){
TSK_DEBUG_WARN("Not callback installed for RED data");
return 0;
}
if((F = (pdata[0] & 0x80)) == 0){
i = 1;
red_hdrs_count = 1;
}
else{
for(i = 0, red_hdrs_count = 0; i < in_size; i+= 4, ++red_hdrs_count){
if((F = (pdata[i] & 0x80)) == 0){ ++i; ++red_hdrs_count; break; }
}
}
if(i >= in_size){
TSK_DEBUG_ERROR("Invalid data");
return 0;
}
pdata += i;
in_size -= i;
for(i = 0; i < red_hdrs_count && in_size > 0; ++i){
TSK_OBJECT_SAFE_FREE(red_rtp_pkt);
if(!(red_rtp_pkt = trtp_rtp_packet_create_null())){
TSK_DEBUG_ERROR("Failed to create RTP packet");
continue;
}
if(!(red_rtp_pkt->header = trtp_rtp_header_create(rtp_hdr->ssrc, rtp_hdr->seq_num, rtp_hdr->timestamp, rtp_hdr->payload_type, rtp_hdr->marker))){
TSK_DEBUG_ERROR("Failed to create RTP header");
continue;
}
// Must create an RTP packet for each RED chunck as they will be saved in the JB
last = (i == (red_hdrs_count - 1));
F = (red_hdr[0] & 0x80);
red_rtp_pkt->header->payload_type = (red_hdr[0] & 0x7F);
if(last || !F){
/*
0 1 2 3 4 5 6 7
+-+-+-+-+-+-+-+-+
|0| Block PT |
+-+-+-+-+-+-+-+-+
*/
block_length = (uint16_t)in_size;
}
else{
/*
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|1| block PT=7 | timestamp offset | block length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
timestamp_offset = ((red_hdr[1] << 8) | red_hdr[2]) >> 2;
block_length = ((red_hdr[2] & 0x03) << 8) | red_hdr[3];
if(block_length > in_size){
TSK_DEBUG_ERROR("Invalid 'block length'");
break;
}
red_rtp_pkt->header->timestamp += timestamp_offset;
red_hdr += 4;
}
// decode
if(red->callback){
// do not use "data_const" as payload will be saved in the jitter buffer and decoded later (async)
#if HAVE_CRT //Debug memory
if((red_rtp_pkt->payload.data =malloc(block_length))){
#else
if((red_rtp_pkt->payload.data = tsk_malloc(block_length))){
#endif //HAVE_CRT
memcpy(red_rtp_pkt->payload.data, pdata, block_length);
red_rtp_pkt->payload.size = block_length;
red->callback(red->callback_data, red_rtp_pkt);
}
}
pdata += block_length;
in_size -= block_length;
}
TSK_OBJECT_SAFE_FREE(red_rtp_pkt);
return 0; // must be always zero
}
static tsk_bool_t tdav_codec_red_sdp_att_match(const tmedia_codec_t* codec, const char* att_name, const char* att_value)
{
return tsk_true;
}
static char* tdav_codec_red_sdp_att_get(const tmedia_codec_t* self, const char* att_name)
{
return tsk_null;
}
/* ============ red object definition ================= */
/* constructor */
static tsk_object_t* tdav_codec_red_ctor(tsk_object_t * self, va_list * app)
{
tdav_codec_red_t *red = self;
if(red){
/* init base: called by tmedia_codec_create() */
/* init self */
}
return self;
}
/* destructor */
static tsk_object_t* tdav_codec_red_dtor(tsk_object_t * self)
{
tdav_codec_red_t *red = self;
if(red){
/* deinit base */
tmedia_codec_video_deinit(red);
/* deinit self */
}
return self;
}
/* object definition */
static const tsk_object_def_t tdav_codec_red_def_s =
{
sizeof(tdav_codec_red_t),
tdav_codec_red_ctor,
tdav_codec_red_dtor,
tmedia_codec_cmp,
};
/* plugin definition*/
static const tmedia_codec_plugin_def_t tdav_codec_red_plugin_def_s =
{
&tdav_codec_red_def_s,
(/* tmedia_video | tmedia_audio | */tmedia_t140), // FIXME: for now is only supported with T.140
tmedia_codec_id_red,
"red",
"red codec",
TMEDIA_CODEC_FORMAT_RED,
tsk_true,
1000, // rate: FIXME: for now it's only for T.140
/* audio */
{ 0 },
/* video (defaul width,height,fps) */
{176, 144, 15},
tsk_null, // set()
tdav_codec_red_open,
tdav_codec_red_close,
tdav_codec_red_encode,
tdav_codec_red_decode,
tdav_codec_red_sdp_att_match,
tdav_codec_red_sdp_att_get
};
const tmedia_codec_plugin_def_t *tdav_codec_red_plugin_def_t = &tdav_codec_red_plugin_def_s; |