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/*
* Copyright (C) 2009-2010 Mamadou Diop.
*
* Contact: Mamadou Diop <diopmamadou(at)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_h264_rtp.c
* @brief H.264 payloader/depayloder as per RFC 3984
*
* @author Mamadou Diop <diopmamadou(at)doubango.org>
*
* @date Created: Sat Nov 8 16:54:58 2009 mdiop
*/
#include "tinydav/codecs/h264/tdav_codec_h264_rtp.h"
#include "tinydav/codecs/h264/tdav_codec_h264.h"
#if HAVE_FFMPEG && (!defined(HAVE_H264) || HAVE_H264)
#include "tinymedia/tmedia_codec.h"
#include "tsk_string.h"
#include "tsk_debug.h"
#include "tsk_memory.h"
#include <string.h> /* strlen() */
#include <stdlib.h> /* strtol() */
/*
* ITU H.264 - http://www.itu.int/rec/T-REC-H.264-200903-S/en
*/
uint8_t H264_START_CODE_PREFIX[4] = { 0x00, 0x00, 0x00, 0x01 };
#define H264_NAL_UNIT_TYPE_HEADER_SIZE 1
#define H264_F_UNIT_TYPE_HEADER_SIZE 1
#define H264_FUA_HEADER_SIZE 2
#define H264_FUB_HEADER_SIZE 4
#define H264_NAL_AGG_MAX_SIZE 65535
int tdav_codec_h264_get_fua_pay(const uint8_t* in_data, tsk_size_t in_size, const void** out_data, tsk_size_t *out_size, tsk_bool_t* append_scp);
int tdav_codec_h264_get_nalunit_pay(const uint8_t* in_data, tsk_size_t in_size, const void** out_data, tsk_size_t *out_size);
// profile_level_id MUST be a "null-terminated" string
int tdav_codec_h264_parse_profile(const char* profile_level_id, profile_idc_t *p_idc, profile_iop_t *p_iop, level_idc_t *l_idc)
{
uint32_t value;
if(tsk_strlen(profile_level_id) != 6){
TSK_DEBUG_ERROR("I say [%s] is an invalid profile-level-id", profile_level_id);
return -1;
}
value = strtol(profile_level_id, tsk_null, 16);
/* profile-idc */
if(p_idc){
switch((value >> 16)){
case profile_idc_baseline:
*p_idc = profile_idc_baseline;
break;
case profile_idc_extended:
*p_idc = profile_idc_extended;
break;
case profile_idc_main:
*p_idc = profile_idc_main;
break;
case profile_idc_high:
*p_idc = profile_idc_high;
break;
default:
*p_idc = profile_idc_none;
break;
}
}
/* profile-iop */
if(p_iop){
p_iop->constraint_set0_flag = ((value >> 8) & 0x80)>>7;
p_iop->constraint_set1_flag = ((value >> 8) & 0x40)>>6;
p_iop->constraint_set2_flag = ((value >> 8) & 0x20)>>5;
p_iop->reserved_zero_5bits = ((value >> 8) & 0x1F);
}
/* level-idc */
if(l_idc){
switch((value & 0xFF)){
case level_idc_1_0:
*l_idc = level_idc_1_0;
break;
case level_idc_1_b:
*l_idc = level_idc_1_b;
break;
case level_idc_1_1:
*l_idc = level_idc_1_1;
break;
case level_idc_1_2:
*l_idc = level_idc_1_2;
break;
case level_idc_1_3:
*l_idc = level_idc_1_3;
break;
case level_idc_2_0:
*l_idc = level_idc_2_0;
break;
case level_idc_2_1:
*l_idc = level_idc_2_1;
break;
case level_idc_2_2:
*l_idc = level_idc_2_2;
break;
case level_idc_3_0:
*l_idc = level_idc_3_0;
break;
default:
*l_idc = level_idc_none;
break;
}
}
return 0;
}
int tdav_codec_h264_get_pay(const void* in_data, tsk_size_t in_size, const void** out_data, tsk_size_t *out_size, tsk_bool_t* append_scp)
{
const uint8_t* pdata = in_data;
if(!in_data || !in_size || !out_data || !out_size){
TSK_DEBUG_ERROR("Invalid parameter");
return -1;
}
*out_data = tsk_null;
*out_size = 0;
*append_scp = tsk_true;
/* 5.3. NAL Unit Octet Usage
+---------------+
|0|1|2|3|4|5|6|7|
+-+-+-+-+-+-+-+-+
|F|NRI| Type |
+---------------+
*/
switch((pdata[0] & 0x1F)){
case undefined_0:
case undefined_30:
case undefined_31:
case stap_a:
case stap_b:
case mtap16:
case mtap24:
break;
case fu_a:
return tdav_codec_h264_get_fua_pay(pdata, in_size, out_data, out_size, append_scp);
case fu_b:
return -1;
default: /* NAL unit (1-23) */
return tdav_codec_h264_get_nalunit_pay(pdata, in_size, out_data, out_size);
}
TSK_DEBUG_WARN("%d not supported as valid NAL Unit type", (*pdata & 0x1F));
return -1;
}
int tdav_codec_h264_get_fua_pay(const uint8_t* in_data, tsk_size_t in_size, const void** out_data, tsk_size_t *out_size, tsk_bool_t* append_scp)
{
if(in_size <=2){
TSK_DEBUG_ERROR("Too short");
return -1;
}
/* RFC 3984 - 5.8. Fragmentation Units (FUs)
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| FU indicator | FU header | |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| |
| FU payload |
| |
| +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| :...OPTIONAL RTP padding |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
The FU indicator octet has the following format:
+---------------+
|0|1|2|3|4|5|6|7|
+-+-+-+-+-+-+-+-+
|F|NRI| Type |
+---------------+
The FU header has the following format:
+---------------+
|0|1|2|3|4|5|6|7|
+-+-+-+-+-+-+-+-+
|S|E|R| Type |
+---------------+
*/
if((in_data[1] & 0x80) == 0x80 /*S*/){
/* discard "FU indicator"
S: 1 bit
When set to one, the Start bit indicates the start of a fragmented
NAL unit. When the following FU payload is not the start of a
fragmented NAL unit payload, the Start bit is set to zero.
*/
if(in_size> H264_NAL_UNIT_TYPE_HEADER_SIZE){
uint8_t hdr;
*out_data = (in_data + H264_NAL_UNIT_TYPE_HEADER_SIZE);
*out_size = (in_size - H264_NAL_UNIT_TYPE_HEADER_SIZE);
// F, NRI and Type
hdr = (in_data[0] & 0xe0) /* F,NRI from "FU indicator"*/ | (in_data[1] & 0x1f) /* type from "FU header" */;
*((uint8_t*)*out_data) = hdr;
// Need to append Start Code Prefix
*append_scp = tsk_true;
}
else{
TSK_DEBUG_ERROR("Too short");
return -1;
}
}
else{
/* "FU indicator" and "FU header" */
if(in_size> H264_FUA_HEADER_SIZE){
*out_data = (in_data + H264_FUA_HEADER_SIZE);
*out_size = (in_size - H264_FUA_HEADER_SIZE);
*append_scp = tsk_false;
}
else{
TSK_DEBUG_ERROR("Too short");
return -1;
}
}
return 0;
}
int tdav_codec_h264_get_nalunit_pay(const uint8_t* in_data, tsk_size_t in_size, const void** out_data, tsk_size_t *out_size)
{
/* 5.6. Single NAL Unit Packet
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|F|NRI| type | |
+-+-+-+-+-+-+-+-+ |
| |
| Bytes 2..n of a Single NAL unit |
| |
| +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| :...OPTIONAL RTP padding |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
*out_data = in_data;
*out_size = in_size;
return 0;
}
#if TDAV_UNDER_WINDOWS
# include "tsk_thread.h"
#endif
void tdav_codec_h264_rtp_callback(struct tdav_codec_h264_s *self, const void *data, tsk_size_t size, tsk_bool_t marker)
{
uint8_t* pdata = (uint8_t*)data;
if(size>4 && pdata[0] == H264_START_CODE_PREFIX[0] && pdata[1] == H264_START_CODE_PREFIX[1]){
if(pdata[2] == H264_START_CODE_PREFIX[3]){
pdata += 3, size -= 3;
}
else if(pdata[2] == H264_START_CODE_PREFIX[2] && pdata[3] == H264_START_CODE_PREFIX[3]){
pdata += 4, size -= 4;
}
}
//TSK_DEBUG_INFO("==> SCP %2x %2x %2x %2x", pdata[0], pdata[1], pdata[2], pdata[3]);
if(size < H264_RTP_PAYLOAD_SIZE){
/* Can be packet in a Single Nal Unit */
// Send data over the network
if(TMEDIA_CODEC_VIDEO(self)->callback){
TMEDIA_CODEC_VIDEO(self)->callback(TMEDIA_CODEC_VIDEO(self)->callback_data, pdata, size, (3003* (30/TMEDIA_CODEC_VIDEO(self)->fps)), marker);
}
}
else if(size > H264_NAL_UNIT_TYPE_HEADER_SIZE){
#if TDAV_UNDER_WINDOWS
tsk_bool_t burst = ((size/H264_RTP_PAYLOAD_SIZE) > 5);
int count = 0;
#endif
/* Should be Fragmented as FUA */
uint8_t fua_hdr[H264_FUA_HEADER_SIZE]; /* "FU indicator" and "FU header" - 2bytes */
fua_hdr[0] = pdata[0] & 0x60/* F=0 */, fua_hdr[0] |= fu_a;
fua_hdr[1] = 0x80/* S=1,E=0,R=0 */, fua_hdr[1] |= pdata[0] & 0x1f; /* type */
// discard header
pdata += H264_NAL_UNIT_TYPE_HEADER_SIZE;
size -= H264_NAL_UNIT_TYPE_HEADER_SIZE;
while(size){
tsk_size_t packet_size = TSK_MIN(H264_RTP_PAYLOAD_SIZE, size);
if(self->rtp.size < (packet_size + H264_FUA_HEADER_SIZE)){
if(!(self->rtp.ptr = tsk_realloc(self->rtp.ptr, (packet_size + H264_FUA_HEADER_SIZE)))){
TSK_DEBUG_ERROR("Failed to allocate new buffer");
return;
}
self->rtp.size = (packet_size + H264_FUA_HEADER_SIZE);
}
// set E bit
if((size - packet_size) == 0){
// Last packet
fua_hdr[1] |= 0x40;
}
// copy FUA header
memcpy(self->rtp.ptr, fua_hdr, H264_FUA_HEADER_SIZE);
// reset "S" bit
fua_hdr[1] &= 0x7F;
// copy data
memcpy((self->rtp.ptr + H264_FUA_HEADER_SIZE), pdata, packet_size);
pdata += packet_size;
size -= packet_size;
// send data
if(TMEDIA_CODEC_VIDEO(self)->callback){
TMEDIA_CODEC_VIDEO(self)->callback(TMEDIA_CODEC_VIDEO(self)->callback_data, self->rtp.ptr, (packet_size + H264_FUA_HEADER_SIZE), (3003* (30/TMEDIA_CODEC_VIDEO(self)->fps)), (size == 0));
#if TDAV_UNDER_WINDOWS// FIXME: WinSock problem: Why do we get packet lost (burst case only)?
if(burst && (++count % 2 == 0)){
tsk_thread_sleep(1); // 1 millisecond
}
#endif
}
}
}
}
#endif /* HAVE_FFMPEG */
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