Francois Cartegnie
11 years ago
6 changed files with 318 additions and 0 deletions
@ -0,0 +1,251 @@ |
|||
/*****************************************************************************
|
|||
* scte18.c : SCTE-18 EAS decoder |
|||
***************************************************************************** |
|||
* Copyright (C) 2016 - VideoLAN Authors |
|||
* |
|||
* This program is free software; you can redistribute it and/or modify it |
|||
* under the terms of the GNU Lesser General Public License as published by |
|||
* the Free Software Foundation; either version 2.1 of the License, or |
|||
* (at your option) any later version. |
|||
* |
|||
* This program 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 Lesser General Public License for more details. |
|||
* |
|||
* You should have received a copy of the GNU General Public License |
|||
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|||
*****************************************************************************/ |
|||
|
|||
#ifdef HAVE_CONFIG_H |
|||
# include "config.h" |
|||
#endif |
|||
|
|||
#include <vlc_common.h> |
|||
#include <vlc_plugin.h> |
|||
#include <vlc_codec.h> |
|||
|
|||
#include "atsc_a65.h" |
|||
#include "scte18.h" |
|||
#include "substext.h" |
|||
|
|||
#include <time.h> |
|||
|
|||
/*****************************************************************************
|
|||
* Module descriptor. |
|||
*****************************************************************************/ |
|||
static int Open (vlc_object_t *); |
|||
static void Close(vlc_object_t *); |
|||
|
|||
vlc_module_begin () |
|||
set_description(N_("SCTE-18 decoder")) |
|||
set_shortname(N_("SCTE-18")) |
|||
set_capability( "decoder", 51) |
|||
set_category(CAT_INPUT) |
|||
set_subcategory(SUBCAT_INPUT_SCODEC) |
|||
set_callbacks(Open, Close) |
|||
vlc_module_end () |
|||
|
|||
struct decoder_sys_t |
|||
{ |
|||
atsc_a65_handle_t *p_handle; |
|||
}; |
|||
|
|||
//#define GPS_UTC_EPOCH_OFFSET 315964800
|
|||
//#define GPS_CUR_UTC_LEAP_OFFSET 16 /* 1 Jul 2015 */
|
|||
|
|||
typedef struct scte18_cea_t |
|||
{ |
|||
uint16_t i_eas_event_id; |
|||
char rgc_eas_originator_code[3]; |
|||
char * psz_eas_event_code; |
|||
char * psz_nature_of_activation; |
|||
uint8_t alert_message_time_remaining; |
|||
uint32_t event_start_time; |
|||
uint16_t event_duration; |
|||
uint8_t alert_priority; |
|||
|
|||
char * psz_alert_text; |
|||
|
|||
} scte18_cea_t; |
|||
|
|||
/****************************************************************************
|
|||
* Local prototypes |
|||
****************************************************************************/ |
|||
#define BUF_ADVANCE(n) p_buffer += n; i_buffer -= n; |
|||
|
|||
static inline scte18_cea_t * scte18_cea_New() |
|||
{ |
|||
return calloc( 1, sizeof(scte18_cea_t) ); |
|||
} |
|||
|
|||
static void scte18_cea_Free( scte18_cea_t *p_cea ) |
|||
{ |
|||
free( p_cea->psz_alert_text ); |
|||
free( p_cea->psz_nature_of_activation ); |
|||
free( p_cea->psz_eas_event_code ); |
|||
free( p_cea ); |
|||
} |
|||
|
|||
static scte18_cea_t * scte18_cea_Decode( atsc_a65_handle_t *p_handle, const block_t *p_block ) |
|||
{ |
|||
size_t len; |
|||
scte18_cea_t *p_cea = scte18_cea_New(); |
|||
if( !p_cea ) |
|||
return NULL; |
|||
|
|||
const uint8_t *p_buffer = p_block->p_buffer; |
|||
size_t i_buffer = p_block->i_buffer; |
|||
|
|||
if( i_buffer < 34 || p_buffer[0] != 0 ) |
|||
goto error; |
|||
|
|||
BUF_ADVANCE(1); |
|||
|
|||
p_cea->i_eas_event_id = GetWBE( p_buffer ); |
|||
BUF_ADVANCE(2); |
|||
|
|||
memcpy( p_cea->rgc_eas_originator_code, p_buffer, 3 ); |
|||
BUF_ADVANCE(3); |
|||
|
|||
len = p_buffer[0]; |
|||
if( i_buffer < 23 + len ) |
|||
goto error; |
|||
p_cea->psz_eas_event_code = malloc( len + 1 ); |
|||
memcpy( p_cea->psz_eas_event_code, &p_buffer[1], len ); |
|||
p_cea->psz_eas_event_code[len] = 0; |
|||
BUF_ADVANCE( len + 1 ); |
|||
|
|||
len = p_buffer[0]; |
|||
if( i_buffer < len + 22 ) |
|||
goto error; |
|||
p_cea->psz_nature_of_activation = atsc_a65_Decode_multiple_string( p_handle, &p_buffer[1], len ); |
|||
BUF_ADVANCE(1 + len); |
|||
|
|||
if( i_buffer < 21 ) |
|||
goto error; |
|||
p_cea->alert_message_time_remaining = p_buffer[0]; |
|||
BUF_ADVANCE(1); |
|||
|
|||
p_cea->event_start_time = GetDWBE( p_buffer ); |
|||
BUF_ADVANCE(4); |
|||
|
|||
p_cea->event_duration = GetWBE( p_buffer ); |
|||
if( p_cea->event_duration != 0 && ( p_cea->event_duration < 15 || p_cea->event_duration > 6000 ) ) |
|||
goto error; |
|||
BUF_ADVANCE(2); |
|||
|
|||
p_cea->alert_priority = p_buffer[1] & 0x0f; |
|||
switch( p_cea->alert_priority ) |
|||
{ |
|||
case EAS_PRIORITY_TEST: |
|||
case EAS_PRIORITY_LOW: |
|||
case EAS_PRIORITY_MEDIUM: |
|||
case EAS_PRIORITY_HIGH: |
|||
case EAS_PRIORITY_MAX: |
|||
break; |
|||
default: |
|||
goto error; |
|||
} |
|||
|
|||
BUF_ADVANCE(2); |
|||
|
|||
BUF_ADVANCE(2); //OOB_ID
|
|||
|
|||
BUF_ADVANCE(2); //
|
|||
BUF_ADVANCE(2); //
|
|||
|
|||
BUF_ADVANCE(2); //audio_OOB_ID
|
|||
|
|||
len = GetWBE( p_buffer ); |
|||
if( i_buffer < len + 2 ) |
|||
goto error; |
|||
p_cea->psz_alert_text = atsc_a65_Decode_multiple_string( p_handle, &p_buffer[2], len ); |
|||
|
|||
return p_cea; |
|||
|
|||
error: |
|||
scte18_cea_Free( p_cea ); |
|||
return NULL; |
|||
} |
|||
|
|||
static subpicture_t *Decode( decoder_t *p_dec, block_t **pp_block ) |
|||
{ |
|||
if ( pp_block == NULL || *pp_block == NULL ) |
|||
return NULL; |
|||
block_t *p_block = *pp_block; *pp_block = NULL; |
|||
subpicture_t *p_spu = NULL; |
|||
|
|||
if (p_block->i_flags & (BLOCK_FLAG_CORRUPTED)) |
|||
goto exit; |
|||
|
|||
scte18_cea_t *p_cea = scte18_cea_Decode( p_dec->p_sys->p_handle, p_block ); |
|||
if( p_cea ) |
|||
{ |
|||
p_spu = decoder_NewSubpictureText( p_dec ); |
|||
if( p_spu ) |
|||
{ |
|||
subpicture_updater_sys_t *p_spu_sys = p_spu->updater.p_sys; |
|||
|
|||
p_spu->i_start = p_block->i_pts; |
|||
if( p_cea->alert_message_time_remaining ) |
|||
p_spu->i_stop = p_spu->i_start + CLOCK_FREQ * p_cea->alert_message_time_remaining; |
|||
else |
|||
p_spu->i_stop = VLC_TS_INVALID; |
|||
|
|||
p_spu->b_ephemer = true; |
|||
p_spu->b_absolute = false; |
|||
|
|||
p_spu_sys->align = SUBPICTURE_ALIGN_TOP; |
|||
p_spu_sys->p_default_style->i_style_flags = STYLE_BOLD | STYLE_BACKGROUND; |
|||
p_spu_sys->p_default_style->i_features |= STYLE_HAS_FLAGS; |
|||
p_spu_sys->p_default_style->i_background_color = 0x000000; |
|||
p_spu_sys->p_default_style->i_background_alpha = STYLE_ALPHA_OPAQUE; |
|||
p_spu_sys->p_default_style->i_features |= STYLE_HAS_BACKGROUND_COLOR | STYLE_HAS_BACKGROUND_ALPHA; |
|||
p_spu_sys->p_default_style->i_font_color = 0xFF0000; |
|||
p_spu_sys->p_default_style->i_features |= STYLE_HAS_FONT_COLOR; |
|||
|
|||
p_spu_sys->p_segments = text_segment_New( p_cea->psz_alert_text ); |
|||
} |
|||
msg_Info( p_dec, "Received %s", p_cea->psz_alert_text ); |
|||
scte18_cea_Free( p_cea ); |
|||
} |
|||
|
|||
exit: |
|||
block_Release( p_block ); |
|||
return p_spu; |
|||
} |
|||
|
|||
static int Open( vlc_object_t *object ) |
|||
{ |
|||
decoder_t *dec = (decoder_t *)object; |
|||
|
|||
if ( dec->fmt_in.i_codec != VLC_CODEC_SCTE_18 ) |
|||
return VLC_EGENERIC; |
|||
|
|||
decoder_sys_t *p_sys = malloc( sizeof(decoder_sys_t) ); |
|||
if( unlikely(!p_sys) ) |
|||
return VLC_ENOMEM; |
|||
|
|||
p_sys->p_handle = atsc_a65_handle_New( NULL ); |
|||
if( !p_sys->p_handle ) |
|||
{ |
|||
free( p_sys ); |
|||
return VLC_EGENERIC; |
|||
} |
|||
|
|||
dec->p_sys = p_sys; |
|||
dec->pf_decode_sub = Decode; |
|||
es_format_Init( &dec->fmt_out, SPU_ES, 0 ); |
|||
|
|||
return VLC_SUCCESS; |
|||
} |
|||
|
|||
static void Close( vlc_object_t *p_object ) |
|||
{ |
|||
decoder_t *p_dec = (decoder_t *)p_object; |
|||
decoder_sys_t *p_sys = (decoder_sys_t *) p_dec->p_sys; |
|||
atsc_a65_handle_Release( p_sys->p_handle ); |
|||
free( p_sys ); |
|||
} |
|||
|
|||
@ -0,0 +1,59 @@ |
|||
/*****************************************************************************
|
|||
* scte18.h : SCTE-18 EAS decoder |
|||
***************************************************************************** |
|||
* Copyright (C) 2016 - VideoLAN Authors |
|||
* |
|||
* This program is free software; you can redistribute it and/or modify it |
|||
* under the terms of the GNU Lesser General Public License as published by |
|||
* the Free Software Foundation; either version 2.1 of the License, or |
|||
* (at your option) any later version. |
|||
* |
|||
* This program 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 Lesser General Public License for more details. |
|||
* |
|||
* You should have received a copy of the GNU General Public License |
|||
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|||
*****************************************************************************/ |
|||
#ifndef VLC_SCTE18_H |
|||
#define VLC_SCTE18_H |
|||
|
|||
#define SCTE18_SI_BASE_PID 0x1FFB |
|||
#define SCTE18_TABLE_ID 0xD8 |
|||
#define SCTE18_DESCRIPTION N_("Emergency Alert Messaging for Cable") |
|||
|
|||
enum |
|||
{ |
|||
EAS_PRIORITY_TEST = 0, |
|||
EAS_PRIORITY_LOW = 3, |
|||
EAS_PRIORITY_MEDIUM = 7, |
|||
EAS_PRIORITY_HIGH = 11, |
|||
EAS_PRIORITY_MAX = 15 |
|||
}; |
|||
|
|||
/* Get priority without decoding
|
|||
*/ |
|||
static inline int scte18_get_EAS_priority( const uint8_t *p_buffer, size_t i_buffer ) |
|||
{ |
|||
if( i_buffer < 17 || p_buffer[0] ) |
|||
return -1; |
|||
|
|||
size_t i_offset = 6; |
|||
size_t i_len = p_buffer[i_offset]; /* EAS code Len */ |
|||
i_offset += i_len + 1; /* EAS code Text */ |
|||
if( i_offset >= i_buffer ) |
|||
return -1; |
|||
|
|||
i_len = p_buffer[i_offset]; /* NOA Len */ |
|||
i_offset += i_len + 1; /* NOA Text */ |
|||
|
|||
i_offset += 1 + 4 + 2 + 1; |
|||
|
|||
if( i_offset >= i_buffer ) |
|||
return -1; |
|||
|
|||
return (p_buffer[i_offset] & 0x0f); |
|||
} |
|||
|
|||
#endif |
|||
Loading…
Reference in new issue