#if HAVE_CRT
#define _CRTDBG_MAP_ALLOC
#include <stdlib.h>
#include <crtdbg.h>
#endif //HAVE_CRT
/*
* Copyright (C) 2020, University of the Basque Country (UPV/EHU)
* 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_mp4ves.c
* @brief MP4V-ES codec plugin
* RTP payloader/depayloader follows RFC 3016.
* ISO-IEC-14496-2: http://www.csus.edu/indiv/p/pangj/aresearch/video_compression/presentation/ISO-IEC-14496-2_2001_MPEG4_Visual.pdf
*
* @author Mamadou Diop <diopmamadou(at)doubango.org>
*
* @date Created: Th Dec 2 16:54:58 2010 mdiop
*/
#include "tinydav/codecs/mp4ves/tdav_codec_mp4ves.h"
#if HAVE_FFMPEG
#include "tinydav/video/tdav_converter_video.h"
#include "tinyrtp/rtp/trtp_rtp_packet.h"
#include "tnet_endianness.h"
#include "tinymedia/tmedia_params.h"
#include "tinymedia/tmedia_defaults.h"
#include "tsk_string.h"
#include "tsk_params.h"
#include "tsk_memory.h"
#include "tsk_debug.h"
#include <libavcodec/avcodec.h>
#define DEFAULT_PROFILE_LEVEL_ID Simple_Profile_Level_1
#define MP4V_GOP_SIZE_IN_SECONDS 25
#define MP4V_RTP_PAYLOAD_SIZE 900
typedef struct tdav_codec_mp4ves_s
{
TMEDIA_DECLARE_CODEC_VIDEO;
int profile;
struct{
uint8_t* ptr;
tsk_size_t size;
} rtp;
// Encoder
struct{
AVCodec* codec;
AVCodecContext* context;
AVFrame* picture;
void* buffer;
tsk_bool_t force_idr;
int quality; // [1-31]
int rotation;
int32_t max_bw_kpbs;
} encoder;
// decoder
struct{
AVCodec* codec;
AVCodecContext* context;
AVFrame* picture;
void* accumulator;
uint8_t ebit;
tsk_size_t accumulator_pos;
uint16_t last_seq;
} decoder;
}
tdav_codec_mp4ves_t;
// From ISO-IEC-14496-2
typedef enum mp4v_codes_e
{
// To initiate a visual session (6.3.2)
visual_object_sequence_start_code = 0x000001B0,
// To terminate a visual session (6.3.2)
visual_object_sequence_end_code = 0x000001B1,
// To initiate a visual object (6.3.2)
visual_object_start_code = 0x000001B5,
// To identify the beginning of user data. The user data continues until receipt of another start code. (6.3.2.1)
user_data_start_code = 0x000001B2,
// The video_object_layer_start_code is a string of 32 bits. The first 28 bits are
// �0000 0000 0000 0000 0000 0001 0010� in binary and the last 4-bits represent one of the values in the range of
// �0000� to �1111� in binary. The video_object_layer_start_code marks a new video object layer. (6.3.3)
video_object_layer_start_code = 0x0000012,
// To identify the beginning of a GOV header (6.3.4)
group_of_vop_start_code = 0x000001B3,
// To mark the start of a video object plane (6.3.5 )
vop_start_code = 0x000001B6,
}
mp4v_start_code_t;
// From ISO-IEC-14496-2 Annex G
typedef enum mp4v_profiles_e
{
/* Reserved = 0x00000000 */
Simple_Profile_Level_1 = 1,
Simple_Profile_Level_2 = 2,
Simple_Profile_Level_3 = 3,
/* Reserved 00000100 ? 00010000 */
Simple_Scalable_Profile_Level_1 = 17,
Simple_Scalable_Profile_Level_2 = 18,
/* Reserved 00010011 ? = 0x00100000 */
Core_Profile_Level_1 = 33,
Core_Profile_Level_2 = 34,
/* Reserved 00100011 ? = 0x00110001 */
Main_Profile_Level_2 = 50,
Main_Profile_Level_3 = 51,
Main_Profile_Level_4 = 52,
/* Reserved 00110101 ? = 0x01000001 */
N_bit_Profile_Level_2 = 66,
/* Reserved 01000011 ? = 0x01010000 */
Scalable_Texture_Profile_Level_1 = 81,
/* Reserved 01010010 ? 01100000 */
Simple_Face_Animation_Profile_Level_1 = 97,
Simple_Face_Animation_Profile_Level_2 = 98,
Simple_FBA_Profile_Level_1 = 99,
Simple_FBA_Profile_Level_2 = 100,
/* Reserved 01100101 ? 01110000 */
Basic_Animated_Texture_Profile_Level_1 = 113,
Basic_Animated_Texture_Profile_Level_2 = 114,
/* Reserved 01110011 ? 10000000 */
Hybrid_Profile_Level_1 = 129,
Hybrid_Profile_Level_2 = 130,
/* Reserved 10000011 ? 10010000 */
Advanced_Real_Time_Simple_Profile_Level_1 = 145,
Advanced_Real_Time_Simple_Profile_Level_2 = 146,
Advanced_Real_Time_Simple_Profile_Level_3 = 147,
Advanced_Real_Time_Simple_Profile_Level_4 = 148,
/* Reserved 10010101 ? 10100000 */
}
mp4v_profiles_t;
static int tdav_codec_mp4ves_open_encoder(tdav_codec_mp4ves_t* self);
static int tdav_codec_mp4ves_open_decoder(tdav_codec_mp4ves_t* self);
static int tdav_codec_mp4ves_close_encoder(tdav_codec_mp4ves_t* self);
static int tdav_codec_mp4ves_close_decoder(tdav_codec_mp4ves_t* self);
static void tdav_codec_mp4ves_encap(tdav_codec_mp4ves_t* mp4v, const uint8_t* pdata, tsk_size_t size);
static void tdav_codec_mp4ves_rtp_callback(tdav_codec_mp4ves_t *mp4v, const void *data, tsk_size_t size, tsk_bool_t marker);
/* ============ MP4V-ES Plugin interface functions ================= */
static int tdav_codec_mp4ves_set(tmedia_codec_t* self, const tmedia_param_t* param)
{
tdav_codec_mp4ves_t* mp4ves = (tdav_codec_mp4ves_t*)self;
if(!self->opened){
TSK_DEBUG_ERROR("Codec not opened");
return -1;
}
if(param->value_type == tmedia_pvt_int32){
if(tsk_striequals(param->key, "action")){
tmedia_codec_action_t action = (tmedia_codec_action_t)TSK_TO_INT32((uint8_t*)param->value);
switch(action){
case tmedia_codec_action_encode_idr:
{
mp4ves->encoder.force_idr = tsk_true;
break;
}
case tmedia_codec_action_bw_down:
{
mp4ves->encoder.quality = TSK_CLAMP(1, (mp4ves->encoder.quality + 1), 31);
mp4ves->encoder.context->global_quality = FF_QP2LAMBDA * mp4ves->encoder.quality;
break;
}
case tmedia_codec_action_bw_up:
{
mp4ves->encoder.quality = TSK_CLAMP(1, (mp4ves->encoder.quality - 1), 31);
mp4ves->encoder.context->global_quality = FF_QP2LAMBDA * mp4ves->encoder.quality;
break;
}
}
}
else if(tsk_striequals(param->key, "rotation")){
int rotation = *((int32_t*)param->value);
if(mp4ves->encoder.rotation != rotation){
if(self->opened){
int ret;
mp4ves->encoder.rotation = rotation;
if((ret = tdav_codec_mp4ves_close_encoder(mp4ves))){
return ret;
}
if((ret = tdav_codec_mp4ves_open_encoder(mp4ves))){
return ret;
}
}
}
return 0;
}
}
return -1;
}
int tdav_codec_mp4ves_open(tmedia_codec_t* self)
{
int ret;
tdav_codec_mp4ves_t* mp4v = (tdav_codec_mp4ves_t*)self;
if(!mp4v){
TSK_DEBUG_ERROR("Invalid parameter");
return -1;
}
/* the caller (base class) already checked that the codec is not opened */
// Encoder
if((ret = tdav_codec_mp4ves_open_encoder(mp4v))){
return ret;
}
// Decoder
if((ret = tdav_codec_mp4ves_open_decoder(mp4v))){
return ret;
}
return 0;
}
int tdav_codec_mp4ves_close(tmedia_codec_t* self)
{
tdav_codec_mp4ves_t* mp4v = (tdav_codec_mp4ves_t*)self;
if(!mp4v){
TSK_DEBUG_ERROR("Invalid parameter");
return -1;
}
/* the caller (base class) already checked that the codec is opened */
// Encoder
tdav_codec_mp4ves_close_encoder(mp4v);
// Decoder
tdav_codec_mp4ves_close_decoder(mp4v);
return 0;
}
tsk_size_t tdav_codec_mp4ves_encode(tmedia_codec_t* self, const void* in_data, tsk_size_t in_size, void** out_data, tsk_size_t* out_max_size)
{
int ret;
int size;
tdav_codec_mp4ves_t* mp4v = (tdav_codec_mp4ves_t*)self;
if(!self || !in_data || !in_size || !out_data){
TSK_DEBUG_ERROR("Invalid parameter");
return 0;
}
// wrap yuv420 buffer
size = avpicture_fill((AVPicture *)mp4v->encoder.picture, (uint8_t*)in_data, PIX_FMT_YUV420P, mp4v->encoder.context->width, mp4v->encoder.context->height);
if(size != in_size){
/* guard */
TSK_DEBUG_ERROR("Invalid size");
return 0;
}
if(mp4v->encoder.force_idr){
#if LIBAVCODEC_VERSION_MAJOR <= 53
mp4v->encoder.picture->pict_type = FF_I_TYPE;
#else
mp4v->encoder.picture->pict_type = AV_PICTURE_TYPE_I;
#endif
mp4v->encoder.force_idr = tsk_false;
}
else{
mp4v->encoder.picture->pict_type = 0;// reset
}
mp4v->encoder.picture->pts = AV_NOPTS_VALUE;
mp4v->encoder.picture->quality = mp4v->encoder.context->global_quality;
ret = avcodec_encode_video(mp4v->encoder.context, mp4v->encoder.buffer, size, mp4v->encoder.picture);
if(ret > 0){
tdav_codec_mp4ves_encap(mp4v, mp4v->encoder.buffer, (tsk_size_t)ret);
}
return 0;
}
tsk_size_t tdav_codec_mp4ves_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_mp4ves_t* self = (tdav_codec_mp4ves_t*)_self;
const trtp_rtp_header_t* rtp_hdr = proto_hdr;
tsk_size_t xsize, retsize = 0;
int got_picture_ptr;
int ret;
if(!self || !in_data || !in_size || !out_data || !self->decoder.context){
TSK_DEBUG_ERROR("Invalid parameter");
return 0;
}
// get expected size
xsize = avpicture_get_size(self->decoder.context->pix_fmt, self->decoder.context->width, self->decoder.context->height);
/* Packet lost? */
if(self->decoder.last_seq != (rtp_hdr->seq_num - 1) && self->decoder.last_seq){
if(self->decoder.last_seq == rtp_hdr->seq_num){
// Could happen on some stupid emulators
TSK_DEBUG_INFO("Packet duplicated, seq_num=%d", rtp_hdr->seq_num);
return 0;
}
TSK_DEBUG_INFO("Packet lost, seq_num=%d", rtp_hdr->seq_num);
}
self->decoder.last_seq = rtp_hdr->seq_num;
if((self->decoder.accumulator_pos + in_size) <= xsize){
memcpy(&((uint8_t*)self->decoder.accumulator)[self->decoder.accumulator_pos], in_data, in_size);
self->decoder.accumulator_pos += in_size;
}
else{
TSK_DEBUG_WARN("Buffer overflow");
self->decoder.accumulator_pos = 0;
return 0;
}
if(rtp_hdr->marker){
AVPacket packet;
/* allocate destination buffer */
if(*out_max_size <xsize){
if(!(*out_data = tsk_realloc(*out_data, xsize))){
TSK_DEBUG_ERROR("Failed to allocate new buffer");
self->decoder.accumulator_pos = 0;
*out_max_size = 0;
return 0;
}
*out_max_size = xsize;
}
av_init_packet(&packet);
packet.size = (int)self->decoder.accumulator_pos;
packet.data = self->decoder.accumulator;
ret = avcodec_decode_video2(self->decoder.context, self->decoder.picture, &got_picture_ptr, &packet);
if(ret < 0){
TSK_DEBUG_WARN("Failed to decode the buffer with error code = %d", ret);
if(TMEDIA_CODEC_VIDEO(self)->in.callback){
TMEDIA_CODEC_VIDEO(self)->in.result.type = tmedia_video_decode_result_type_error;
TMEDIA_CODEC_VIDEO(self)->in.result.proto_hdr = proto_hdr;
TMEDIA_CODEC_VIDEO(self)->in.callback(&TMEDIA_CODEC_VIDEO(self)->in.result);
}
}
else if(got_picture_ptr){
retsize = xsize;
TMEDIA_CODEC_VIDEO(self)->in.width = self->decoder.context->width;
TMEDIA_CODEC_VIDEO(self)->in.height = self->decoder.context->height;
/* copy picture into a linear buffer */
avpicture_layout((AVPicture *)self->decoder.picture, self->decoder.context->pix_fmt, (int)self->decoder.context->width, (int)self->decoder.context->height,
*out_data, (int)retsize);
}
/* in all cases: reset accumulator */
self->decoder.accumulator_pos = 0;
}
return retsize;
}
tsk_bool_t tdav_codec_mp4ves_sdp_att_match(const tmedia_codec_t* _self, const char* att_name, const char* att_value)
{
tdav_codec_mp4ves_t *self = (tdav_codec_mp4ves_t *)_self;
if(!self){
TSK_DEBUG_ERROR("Invalid parameter");
return tsk_false;
}
if(tsk_striequals(att_name, "fmtp")){
tsk_params_L_t* params ;
/* e.g. profile-level-id=1; xx=yy */
if((params = tsk_params_fromstring(att_value, ";", tsk_true))){
int val_int;
if((val_int = tsk_params_get_param_value_as_int(params, "profile-level-id")) != -1){
TSK_DEBUG_INFO("Proposed profile-level-id=%d", val_int);
self->profile = val_int; // FIXME: Take the remote profile-level-id even if the bandwidth level doesn't match
}
TSK_OBJECT_SAFE_FREE(params);
}
switch (self->profile ) {
case Simple_Profile_Level_1:
TMEDIA_CODEC_VIDEO(self)->out.width = TMEDIA_CODEC_VIDEO(self)->in.width = 176; TMEDIA_CODEC_VIDEO(self)->in.height = TMEDIA_CODEC_VIDEO(self)->out.height = 144;
break;
case Simple_Profile_Level_2:
case Simple_Profile_Level_3:
default:
TMEDIA_CODEC_VIDEO(self)->out.width = TMEDIA_CODEC_VIDEO(self)->in.width = 352; TMEDIA_CODEC_VIDEO(self)->in.height = TMEDIA_CODEC_VIDEO(self)->out.height = 288;
break;
}
}
else if(tsk_striequals(att_name, "imageattr")){
unsigned in_width, in_height, out_width, out_height;
if(tmedia_parse_video_imageattr(att_value, TMEDIA_CODEC_VIDEO(self)->pref_size, &in_width, &in_height, &out_width, &out_height) != 0){
return tsk_false;
}
TMEDIA_CODEC_VIDEO(self)->in.width = in_width;
TMEDIA_CODEC_VIDEO(self)->in.height = in_height;
TMEDIA_CODEC_VIDEO(self)->out.width = out_width;
TMEDIA_CODEC_VIDEO(self)->out.height = out_height;
}
return tsk_true;
}
char* tdav_codec_mp4ves_sdp_att_get(const tmedia_codec_t* _self, const char* att_name)
{
tdav_codec_mp4ves_t *self = (tdav_codec_mp4ves_t *)_self;
if(tsk_striequals(att_name, "fmtp")){
char* fmtp = tsk_null;
switch(_self->bl){//FIXME: deprecated
case tmedia_bl_low:
default:
self->profile = Simple_Profile_Level_1;
break;
case tmedia_bl_medium:
self->profile = Simple_Profile_Level_2;
break;
case tmedia_bl_hight:
case tmedia_bl_unrestricted:
self->profile = Simple_Profile_Level_3;
break;
}
tsk_sprintf(&fmtp, "profile-level-id=%d", self->profile);
return fmtp;
}
else if(tsk_striequals(att_name, "imageattr")){
return tmedia_get_video_imageattr(TMEDIA_CODEC_VIDEO(self)->pref_size,
TMEDIA_CODEC_VIDEO(self)->in.width, TMEDIA_CODEC_VIDEO(self)->in.height, TMEDIA_CODEC_VIDEO(self)->out.width, TMEDIA_CODEC_VIDEO(self)->out.height);
}
return tsk_null;
}
/* ============ Internal functions ================= */
int tdav_codec_mp4ves_open_encoder(tdav_codec_mp4ves_t* self)
{
int ret, size;
int32_t max_bw_kpbs;
if(!self->encoder.codec && !(self->encoder.codec = avcodec_find_encoder(CODEC_ID_MPEG4))){
TSK_DEBUG_ERROR("Failed to find mp4v encoder");
return -1;
}
if(self->encoder.context){
TSK_DEBUG_ERROR("Encoder already opened");
return -1;
}
self->encoder.context = avcodec_alloc_context();
avcodec_get_context_defaults(self->encoder.context);
self->encoder.context->pix_fmt = PIX_FMT_YUV420P;
self->encoder.context->time_base.num = 1;
self->encoder.context->time_base.den = TMEDIA_CODEC_VIDEO(self)->in.fps;
self->encoder.context->width = (self->encoder.rotation == 90 || self->encoder.rotation == 270) ? TMEDIA_CODEC_VIDEO(self)->out.height : TMEDIA_CODEC_VIDEO(self)->out.width;
self->encoder.context->height = (self->encoder.rotation == 90 || self->encoder.rotation == 270) ? TMEDIA_CODEC_VIDEO(self)->out.width : TMEDIA_CODEC_VIDEO(self)->out.height;
self->encoder.context->mb_decision = FF_MB_DECISION_RD;
self->encoder.context->noise_reduction = 250;
self->encoder.context->flags |= CODEC_FLAG_QSCALE;
self->encoder.context->global_quality = FF_QP2LAMBDA * self->encoder.quality;
max_bw_kpbs = TSK_CLAMP(
0,
tmedia_get_video_bandwidth_kbps_2(TMEDIA_CODEC_VIDEO(self)->out.width, TMEDIA_CODEC_VIDEO(self)->out.height, TMEDIA_CODEC_VIDEO(self)->out.fps),
self->encoder.max_bw_kpbs
);
self->encoder.context->bit_rate = (max_bw_kpbs * 1024);// bps
self->encoder.context->rtp_payload_size = MP4V_RTP_PAYLOAD_SIZE;
self->encoder.context->opaque = tsk_null;
self->encoder.context->profile = self->profile>>4;
self->encoder.context->level = self->profile & 0x0F;
self->encoder.context->gop_size = (TMEDIA_CODEC_VIDEO(self)->in.fps * MP4V_GOP_SIZE_IN_SECONDS);
self->encoder.context->max_b_frames = 0;
self->encoder.context->b_frame_strategy = 1;
self->encoder.context->flags |= CODEC_FLAG_AC_PRED;
// Picture (YUV 420)
if(!(self->encoder.picture = avcodec_alloc_frame())){
TSK_DEBUG_ERROR("Failed to create MP4V-ES encoder picture");
return -2;
}
avcodec_get_frame_defaults(self->encoder.picture);
size = avpicture_get_size(PIX_FMT_YUV420P, self->encoder.context->width, self->encoder.context->height);
#if HAVE_CRT //Debug memory
if(!(self->encoder.buffer = calloc(size, sizeof(uint8_t)))){
#else
if(!(self->encoder.buffer = tsk_calloc(size, sizeof(uint8_t)))){
#endif //HAVE_CRT
TSK_DEBUG_ERROR("Failed to allocate MP4V-ES encoder buffer");
return -2;
}
// Open encoder
if((ret = avcodec_open(self->encoder.context, self->encoder.codec)) < 0){
TSK_DEBUG_ERROR("Failed to open MP4V-ES encoder");
return ret;
}
TSK_DEBUG_INFO("[MP4V-ES] bitrate=%d bps", self->encoder.context->bit_rate);
return ret;
}
int tdav_codec_mp4ves_open_decoder(tdav_codec_mp4ves_t* self)
{
int ret, size;
if(!self->decoder.codec && !(self->decoder.codec = avcodec_find_decoder(CODEC_ID_MPEG4))){
TSK_DEBUG_ERROR("Failed to find MP4V-ES decoder");
return -1;
}
if(self->decoder.context){
TSK_DEBUG_ERROR("Decoder already opened");
return -1;
}
self->decoder.context = avcodec_alloc_context();
avcodec_get_context_defaults(self->decoder.context);
self->decoder.context->pix_fmt = PIX_FMT_YUV420P;
self->decoder.context->width = TMEDIA_CODEC_VIDEO(self)->out.width;
self->decoder.context->height = TMEDIA_CODEC_VIDEO(self)->out.height;
// Picture (YUV 420)
if(!(self->decoder.picture = avcodec_alloc_frame())){
TSK_DEBUG_ERROR("Failed to create decoder picture");
return -2;
}
avcodec_get_frame_defaults(self->decoder.picture);
size = avpicture_get_size(PIX_FMT_YUV420P, self->decoder.context->width, self->decoder.context->height);
#if HAVE_CRT //Debug memory
if(!(self->decoder.accumulator = calloc((size + FF_INPUT_BUFFER_PADDING_SIZE), sizeof(uint8_t)))){
#else
if(!(self->decoder.accumulator = tsk_calloc((size + FF_INPUT_BUFFER_PADDING_SIZE), sizeof(uint8_t)))){
#endif //HAVE_CRT
TSK_DEBUG_ERROR("Failed to allocate decoder buffer");
return -2;
}
#if HAVE_CRT //Debug memory
if(!(self->decoder.accumulator = calloc((size + FF_INPUT_BUFFER_PADDING_SIZE), sizeof(uint8_t)))){
#else
if(!(self->decoder.accumulator = tsk_calloc((size + FF_INPUT_BUFFER_PADDING_SIZE), sizeof(uint8_t)))){
#endif //HAVE_CRT
TSK_DEBUG_ERROR("Failed to allocate decoder buffer");
return -2;
}
// Open decoder
if((ret = avcodec_open(self->decoder.context, self->decoder.codec)) < 0){
TSK_DEBUG_ERROR("Failed to open MP4V-ES decoder");
return ret;
}
return ret;
}
int tdav_codec_mp4ves_close_encoder(tdav_codec_mp4ves_t* self)
{
if(self->encoder.context){
avcodec_close(self->encoder.context);
av_free(self->encoder.context);
self->encoder.context = tsk_null;
}
if(self->encoder.picture){
av_free(self->encoder.picture);
}
if(self->encoder.buffer){
TSK_FREE(self->encoder.buffer);
}
return 0;
}
int tdav_codec_mp4ves_close_decoder(tdav_codec_mp4ves_t* self)
{
if(self->decoder.context){
avcodec_close(self->decoder.context);
if(self->decoder.context->extradata){
TSK_FREE(self->decoder.context->extradata);
self->decoder.context->extradata_size = 0;
}
av_free(self->decoder.context);
self->decoder.context = tsk_null;
}
if(self->decoder.picture){
av_free(self->decoder.picture);
self->decoder.picture = tsk_null;
}
if(self->decoder.accumulator){
TSK_FREE(self->decoder.accumulator);
}
return 0;
}
static void tdav_codec_mp4ves_encap(tdav_codec_mp4ves_t* mp4v, const uint8_t* pdata, tsk_size_t size)
{
uint32_t scode; // start code
if(size <= 4/*32bits: start code size*/){
TSK_DEBUG_ERROR("Too short");
return;
}
// first 32bits
scode = tnet_htonl_2(pdata);
/* RFC 3016 - 3.3 Examples of packetized MPEG-4 Visual bitstream
VS= Visual Object Sequence
VO= Visual Object
VOL= Visual Object Layer
VOP= Visual Object Plane
GOV= Group of Visual Object Plane
VP= Video Plane
+------+------+------+------+
(a) | RTP | VS | VO | VOL |
|header|header|header|header|
+------+------+------+------+
+------+------+------+------+------------+
(b) | RTP | VS | VO | VOL |Video Packet|
|header|header|header|header| |
+------+------+------+------+------------+
+------+-----+------------------+
(c) | RTP | GOV |Video Object Plane|
|header| | |
+------+-----+------------------+
+------+------+------------+ +------+------+------------+
(d) | RTP | VOP |Video Packet| | RTP | VP |Video Packet|
|header|header| (1) | |header|header| (2) |
+------+------+------------+ +------+------+------------+
+------+------+------------+------+------------+------+------------+
(e) | RTP | VP |Video Packet| VP |Video Packet| VP |Video Packet|
|header|header| (1) |header| (2) |header| (3) |
+------+------+------------+------+------------+------+------------+
+------+------+------------+ +------+------------+
(f) | RTP | VOP |VOP fragment| | RTP |VOP fragment|
|header|header| (1) | |header| (2) | ___
+------+------+------------+ +------+------------+
Figure 2 - Examples of RTP packetized MPEG-4 Visual bitstream
*/
/* RFC 3016 - 3.2 Fragmentation of MPEG-4 Visual bitstream
A fragmented MPEG-4 Visual bitstream is mapped directly onto the RTP
payload without any addition of extra header fields or any removal of
Visual syntax elements. The Combined Configuration/Elementary
streams mode is used.
In the following, header means one of the following:
- Configuration information (Visual Object Sequence Header, Visual
Object Header and Video Object Layer Header)
- visual_object_sequence_end_code
- The header of the entry point function for an elementary stream
(Group_of_VideoObjectPlane() or the header of VideoObjectPlane(),
video_plane_with_short_header(), MeshObject() or FaceObject())
- The video packet header (video_packet_header() excluding
next_resync_marker())
- The header of gob_layer()
See 6.2.1 "Start codes" of ISO/IEC 14496-2 [2][9][4] for the
definition of the configuration information and the entry point
functions.
*/
switch(scode){
case visual_object_sequence_start_code:
case visual_object_start_code:
case user_data_start_code:
case video_object_layer_start_code:
case group_of_vop_start_code:
case vop_start_code:
{
register uint32_t i, last_index = 0;
int startcode = 0xffffffff;
if(scode == visual_object_sequence_start_code && size >=5){
//uint8_t profile_and_level_indication = pdata[4]; /* IEC 14496-2: 6.3.2 Visual Object Sequence and Visual Object */
// TSK_DEBUG_INFO("profile_and_level_indication=%d", profile_and_level_indication);
}
if(size < MP4V_RTP_PAYLOAD_SIZE){
goto last;
}
for(i = 4; i<(size - 4); i++){
startcode = (startcode <<8) | pdata[i];
switch(startcode){
case visual_object_sequence_start_code:
case group_of_vop_start_code:
case vop_start_code:
tdav_codec_mp4ves_rtp_callback(mp4v, pdata + last_index, (i - last_index), (last_index == size));
last_index = i;
}
}
last:
if(last_index < size){
tdav_codec_mp4ves_rtp_callback(mp4v, pdata + last_index, (size - last_index), tsk_true);
}
break;
}
default:
TSK_DEBUG_ERROR("%x is an invalide start code", scode);
break;
}
}
static void tdav_codec_mp4ves_rtp_callback(tdav_codec_mp4ves_t *mp4v, const void *data, tsk_size_t size, tsk_bool_t marker)
{
// Send data over the network
if(TMEDIA_CODEC_VIDEO(mp4v)->out.callback){
TMEDIA_CODEC_VIDEO(mp4v)->out.result.buffer.ptr = data;
TMEDIA_CODEC_VIDEO(mp4v)->out.result.buffer.size = size;
TMEDIA_CODEC_VIDEO(mp4v)->out.result.duration = (uint32_t)((1./(double)TMEDIA_CODEC_VIDEO(mp4v)->out.fps) * TMEDIA_CODEC(mp4v)->plugin->rate);
TMEDIA_CODEC_VIDEO(mp4v)->out.result.last_chunck = marker;
TMEDIA_CODEC_VIDEO(mp4v)->out.callback(&TMEDIA_CODEC_VIDEO(mp4v)->out.result);
}
}
/* ============ MP4V-ES Plugin interface ================= */
/* constructor */
static tsk_object_t* tdav_codec_mp4ves_ctor(tsk_object_t * _self, va_list * app)
{
tdav_codec_mp4ves_t *self = _self;
if(self){
/* init base: called by tmedia_codec_create() */
/* init self */
self->profile = DEFAULT_PROFILE_LEVEL_ID;
self->encoder.quality = 1;
self->encoder.max_bw_kpbs = tmedia_defaults_get_bandwidth_video_upload_max();
}
return self;
}
/* destructor */
static tsk_object_t* tdav_codec_mp4ves_dtor(tsk_object_t * _self)
{
tdav_codec_mp4ves_t *self = _self;
if(self){
/* deinit base */
tmedia_codec_video_deinit(self); // will close the codec if opened
/* deinit self */
TSK_FREE(self->rtp.ptr);
self->rtp.size = 0;
}
return self;
}
/* object definition */
static const tsk_object_def_t tdav_codec_mp4ves_def_s =
{
sizeof(tdav_codec_mp4ves_t),
tdav_codec_mp4ves_ctor,
tdav_codec_mp4ves_dtor,
tmedia_codec_cmp,
};
/* plugin definition*/
static const tmedia_codec_plugin_def_t tdav_codec_mp4ves_plugin_def_s =
{
&tdav_codec_mp4ves_def_s,
tmedia_video,
tmedia_codec_id_mp4ves_es,
"MP4V-ES",
"MP4V-ES Codec",
TMEDIA_CODEC_FORMAT_MP4V_ES,
tsk_true,
90000, // rate
/* audio */
{ 0 },
/* video (width, height, fps) */
{176, 144, 0},// fps is @deprecated
tdav_codec_mp4ves_set,
tdav_codec_mp4ves_open,
tdav_codec_mp4ves_close,
tdav_codec_mp4ves_encode,
tdav_codec_mp4ves_decode,
tdav_codec_mp4ves_sdp_att_match,
tdav_codec_mp4ves_sdp_att_get
};
const tmedia_codec_plugin_def_t *tdav_codec_mp4ves_plugin_def_t = &tdav_codec_mp4ves_plugin_def_s;
tsk_bool_t tdav_codec_ffmpeg_mp4ves_is_supported()
{
return (avcodec_find_encoder(CODEC_ID_MPEG4) && avcodec_find_decoder(CODEC_ID_MPEG4));
}
#endif /* HAVE_FFMPEG */