Network data stream receiving processing analysis
1. Main thread cycle in the Input.c / Input file
Thread in Charge of Processing The Network Packets and DemultiPlexing
Runthread (Input_thread_t * p_input)
{
INITTHREAD (P_INPUT);
.........................................................
INPUT_SELECTES (p_input, p_input-> stream.p_newly_selected_es);
.........................................................
/ * Read and Demultiplex some data. * /
i_count = p_input-> pf_demux (p_input);
}
2, in the following functions:
Separate Access, Demux, Name string; find the Acess pointer module by the module_need function according to the separate Access string; find the Demux pointer module by the Module_Need function according to the descended Demux string;
Static int initithread (Input_thread_t * p_input)
{
Msg_dbg (p_input, "access`% s', Demux `% s', Name`% s' ",
P_INPUT-> PSZ_Access, P_INPUT-> PSZ_DEMUX, P_INPUT-> PSZ_NAME);
/ * Find and open appropriate Access Module * /
p_input-> p_access = module_need (p_INPUT, "Access",
P_INPUT-> PSZ_Access, VLC_TRUE;
.........................................................
While (! Input_fillbuffer (p_INPUT))
.........................................................
/ * Find and open appropriate Demux Module * /
P_INPUT-> p_demux =
Module_need (p_input, "demux",
(p_INPUT-> PSZ_DEMUX && * P_INPUT-> PSZ_DEMUX)?
P_INPUT-> PSZ_DEMUX: "$ DEMUX",
(p_INPUT-> PSZ_DEMUX && * P_INPUT-> PSZ_DEMUX)?
VLC_TRUE: VLC_FALSE);
.........................................................
}
3, in the PS.c (Module / Demux / MPEG) file
a. Bright function activate by message mapping macro;
b. By function ACTIVATE assignment P_INPUT-> PF_DEMUX = DEMUX;
c. Activate p_INPUT-> P_DEMUX_DATA-> MPEG.PF_READ_PS (PF_READ_PS) function (P_INPUT, & P_DATA) function (P_INPUT, & P_DATA) function (P_INPUT, & P_DATA) function (P_INPUT, & P_DATA) function (P_INPUT, & P_DATA) function (P_INPUT, & P_DATA) function (P_INPUT, & P_DATA) function (P_Input, & p_data) function (p_INPUT, & P_DATA).
d. Activated in the initThread function;
Static Int Activate (VLC_Object_t * p_this)
{
/ * Set the demux function * /
P_INPUT-> PF_DEMUX = DEMUX;
P_INPUT-> p_private = (void *) & p_demux-> mpeg;
P_Demux-> p_module = module_need (p_input, "mpeg-system", null, 0);
}
4, in the System.c (Module / Demux / MPEG) file
Assignment Decoding Module MPEG_DEMUX_T member function;
Static Int Activate (VLC_Object_t * p_this)
{
Static MPEG_DEMUX_T MPEG_DEMUX =
{NULL, READPS, PARSEPS, DEMUXPS, READTS, DEMUXTS}
MPEG_DEMUX.CUR_SCR_TIME = -1;
Memcpy (p_this-> p_private, & mpeg_demux, sizeof (mpeg_demux));
Return VLC_Success;
}
And the function static size_t readps (Input_thread_t * p_input, data_packet_t ** pp_data);
5, in the PS.c (Module / Demux / MPEG) file
DEMUX (Input_thread_t * p_input)
{
I_RESULT = p_input-> p_demux_data-> mpeg.pf_read_ps (p_input, & p_data);
P_INPUT-> P_DEMUX_DATA-> MPEG.PF_DEMUX_PS (P_INPUT, P_DATA);
}
Read data and separation;
6, in the System.c (Module / Demux / MPEG) file
Data walking charts are as follows
Readps-> Peek-> Input_peek (src / input / input_ext-plugins.c) -> Input_fillbuffert via i_ret = p_input-> pf_read (p_input,
(BYTE_T *) P_BUF SIZEOF (Data_Buffer_t)
I_REMAINS,
p_INPUT-> i_bufsize);
The PF_READ function member of the input_thread_t structure If it is a RTPCHOOSE function for udp.c (modules / access)
Then activate by module_need when the Access (UDP module) is turned on;
Activate network read data module RTPCHOOSE (Modules / Access / udp.c) -> read-> net_read (src / misc / net.c);
7, in the Input_Programs.c (SRC / INPUT) file
Run the decoder to the ES stream
INT INPUT_SELECTES (INPUT_THREAD_T * P_INPUT, ES_DESCRIPTOR_T * P_ES)
{
P_ES-> p_dec = INPUT_RUNDECODER (p_input, p_es);
}
INPUT_SELECTES
SRC / INPUT / INPUT_PROGRAMS.C
)
-> Input_Rundecoder
(
SRC / INPUT / INPUT_DEC.C
)
-> DecodeRThread-> DecoderDecode -> Vout_DisplayPicture
