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Commit d1ba16b4 authored by Jean-Paul Saman's avatar Jean-Paul Saman
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NIT: refactor dvbpsi_GatherNITSections

parent 9b62d74a
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Showing with 121 additions and 77 deletions
src/tables/nit.c
View file @ d1ba16b4
/*****************************************************************************
* nit.c: NIT decoder/generator
*----------------------------------------------------------------------------
* Copyright (C) 2001-2011 VideoLAN
* Copyright (C) 2001-2012 VideoLAN
* $Id$
*
* Authors: Johann Hanne
......@@ -290,6 +290,107 @@ dvbpsi_descriptor_t* dvbpsi_NITTSAddDescriptor(dvbpsi_nit_ts_t* p_ts,
return p_descriptor;
}
/* */
static void dvbpsi_ReInitNIT(dvbpsi_nit_decoder_t* p_decoder, const bool b_force)
{
assert(p_decoder);
/* Force redecoding */
if (b_force)
{
p_decoder->b_current_valid = false;
/* Free structures */
if (p_decoder->p_building_nit)
dvbpsi_DeleteNIT(p_decoder->p_building_nit);
}
p_decoder->p_building_nit = NULL;
/* Clear the section array */
for (unsigned int i = 0; i <= 255; i++)
{
if (p_decoder->ap_sections[i] != NULL)
{
dvbpsi_DeletePSISections(p_decoder->ap_sections[i]);
p_decoder->ap_sections[i] = NULL;
}
}
}
static bool dvbpsi_CheckNIT(dvbpsi_t *p_dvbpsi, dvbpsi_nit_decoder_t *p_nit_decoder,
dvbpsi_psi_section_t *p_section)
{
assert(p_dvbpsi);
assert(p_nit_decoder);
bool b_reinit = false;
if (p_nit_decoder->p_building_nit->i_version != p_section->i_version)
{
/* version_number */
dvbpsi_error(p_dvbpsi, "NIT decoder",
"'version_number' differs"
" whereas no discontinuity has occured");
b_reinit = true;
}
else if (p_nit_decoder->i_last_section_number
!= p_section->i_last_number)
{
/* last_section_number */
dvbpsi_error(p_dvbpsi, "NIT decoder",
"'last_section_number' differs"
" whereas no discontinuity has occured");
b_reinit = true;
}
return b_reinit;
}
static bool dvbpsi_IsCompleteNIT(dvbpsi_nit_decoder_t* p_nit_decoder)
{
assert(p_nit_decoder);
bool b_complete = false;
for (unsigned int i = 0; i <= p_nit_decoder->i_last_section_number; i++)
{
if (!p_nit_decoder->ap_sections[i])
break;
if (i == p_nit_decoder->i_last_section_number)
b_complete = true;
}
return b_complete;
}
static bool dvbpsi_AddSectionNIT(dvbpsi_t *p_dvbpsi, dvbpsi_nit_decoder_t *p_nit_decoder,
dvbpsi_psi_section_t* p_section)
{
assert(p_dvbpsi);
assert(p_nit_decoder);
assert(p_section);
/* Initialize the structures if it's the first section received */
if (p_nit_decoder->p_building_nit == NULL)
{
p_nit_decoder->p_building_nit = dvbpsi_NewNIT(p_nit_decoder->i_network_id,
p_section->i_version, p_section->b_current_next);
if (p_nit_decoder->p_building_nit == NULL)
return false;
p_nit_decoder->i_last_section_number = p_section->i_last_number;
}
/* Fill the section array */
if (p_nit_decoder->ap_sections[p_section->i_number] != NULL)
{
dvbpsi_debug(p_dvbpsi, "NIT decoder", "overwrite section number %d",
p_section->i_number);
dvbpsi_DeletePSISections(p_nit_decoder->ap_sections[p_section->i_number]);
}
p_nit_decoder->ap_sections[p_section->i_number] = p_section;
return true;
}
/*****************************************************************************
* dvbpsi_GatherNITSections
*****************************************************************************
......@@ -315,7 +416,7 @@ void dvbpsi_GatherNITSections(dvbpsi_t *p_dvbpsi,
dvbpsi_nit_decoder_t* p_nit_decoder
= (dvbpsi_nit_decoder_t*)p_private_decoder;
/* Now if b_append is true then we have a valid NIT section */
/* We have a valid NIT section */
if (p_nit_decoder->i_network_id != p_section->i_extension)
{
/* Invalid program_number */
......@@ -324,12 +425,10 @@ void dvbpsi_GatherNITSections(dvbpsi_t *p_dvbpsi,
return;
}
bool b_reinit = false;
/* TS discontinuity check */
if (p_nit_decoder->b_discontinuity)
{
b_reinit = true;
dvbpsi_ReInitNIT(p_nit_decoder, true);
p_nit_decoder->b_discontinuity = false;
}
else
......@@ -337,23 +436,8 @@ void dvbpsi_GatherNITSections(dvbpsi_t *p_dvbpsi,
/* Perform some few sanity checks */
if (p_nit_decoder->p_building_nit)
{
if (p_nit_decoder->p_building_nit->i_version != p_section->i_version)
{
/* version_number */
dvbpsi_error(p_dvbpsi, "NIT decoder",
"'version_number' differs"
" whereas no discontinuity has occured");
b_reinit = true;
}
else if (p_nit_decoder->i_last_section_number
!= p_section->i_last_number)
{
/* last_section_number */
dvbpsi_error(p_dvbpsi, "NIT decoder",
"'last_section_number' differs"
" whereas no discontinuity has occured");
b_reinit = true;
}
if (dvbpsi_CheckNIT(p_dvbpsi, p_nit_decoder, p_section))
dvbpsi_ReInitNIT(p_nit_decoder, true);
}
else
{
......@@ -362,73 +446,33 @@ void dvbpsi_GatherNITSections(dvbpsi_t *p_dvbpsi,
&& (p_nit_decoder->current_nit.b_current_next == p_section->b_current_next))
{
/* Don't decode since this version is already decoded */
dvbpsi_debug(p_dvbpsi, "NIT decoder",
"ignoring already decoded section %d",
p_section->i_number);
dvbpsi_DeletePSISections(p_section);
return;;
}
}
}
/* Reinit the decoder if wanted */
if (b_reinit)
{
/* Force redecoding */
p_nit_decoder->b_current_valid = false;
/* Free structures */
if(p_nit_decoder->p_building_nit)
{
dvbpsi_DeleteNIT(p_nit_decoder->p_building_nit);
p_nit_decoder->p_building_nit = NULL;
}
/* Clear the section array */
for (unsigned int i = 0; i <= 255; i++)
{
if (p_nit_decoder->ap_sections[i] != NULL)
{
dvbpsi_DeletePSISections(p_nit_decoder->ap_sections[i]);
p_nit_decoder->ap_sections[i] = NULL;
}
}
}
/* Initialize the structures if it's the first section received */
if (!p_nit_decoder->p_building_nit)
{
p_nit_decoder->p_building_nit = (dvbpsi_nit_t*)malloc(sizeof(dvbpsi_nit_t));
if (p_nit_decoder->p_building_nit)
dvbpsi_InitNIT(p_nit_decoder->p_building_nit,
p_nit_decoder->i_network_id,
p_section->i_version,
p_section->b_current_next);
else
dvbpsi_debug(p_dvbpsi, "NIT decoder", "failed decoding section");
p_nit_decoder->i_last_section_number = p_section->i_last_number;
}
/* Fill the section array */
if (p_nit_decoder->ap_sections[p_section->i_number] != NULL)
/* Add section to NIT */
if (!dvbpsi_AddSectionNIT(p_dvbpsi, p_nit_decoder, p_section))
{
dvbpsi_debug(p_dvbpsi, "NIT decoder", "overwrite section number %d",
p_section->i_number);
dvbpsi_DeletePSISections(p_nit_decoder->ap_sections[p_section->i_number]);
dvbpsi_error(p_dvbpsi, "NIT decoder", "failed decoding section %d",
p_section->i_number);
dvbpsi_DeletePSISections(p_section);
return;
}
p_nit_decoder->ap_sections[p_section->i_number] = p_section;
/* Check if we have all the sections */
bool b_complete = false;
for (unsigned int i = 0; i <= p_nit_decoder->i_last_section_number; i++)
if (dvbpsi_IsCompleteNIT(p_nit_decoder))
{
if (!p_nit_decoder->ap_sections[i])
break;
if (i == p_nit_decoder->i_last_section_number)
b_complete = true;
}
assert(p_nit_decoder->pf_nit_callback);
if (b_complete)
{
/* Save the current information */
p_nit_decoder->current_nit = *p_nit_decoder->p_building_nit;
p_nit_decoder->b_current_valid = true;
/* Chain the sections */
if (p_nit_decoder->i_last_section_number)
{
......@@ -436,19 +480,19 @@ void dvbpsi_GatherNITSections(dvbpsi_t *p_dvbpsi,
p_nit_decoder->ap_sections[i]->p_next =
p_nit_decoder->ap_sections[i + 1];
}
/* Decode the sections */
dvbpsi_DecodeNITSections(p_nit_decoder->p_building_nit,
p_nit_decoder->ap_sections[0]);
/* Delete the sections */
dvbpsi_DeletePSISections(p_nit_decoder->ap_sections[0]);
p_nit_decoder->ap_sections[0] = NULL;
/* signal the new NIT */
p_nit_decoder->pf_nit_callback(p_nit_decoder->p_cb_data,
p_nit_decoder->p_building_nit);
/* Reinitialize the structures */
p_nit_decoder->p_building_nit = NULL;
for (unsigned int i = 0; i <= p_nit_decoder->i_last_section_number; i++)
p_nit_decoder->ap_sections[i] = NULL;
dvbpsi_ReInitNIT(p_nit_decoder, false);
}
}
......
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