mirror of https://code.videolan.org/videolan/vlc
212 lines
6.2 KiB
C
212 lines
6.2 KiB
C
/*****************************************************************************
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* ttml.h : TTML helpers
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*****************************************************************************
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* Copyright (C) 2017 VLC authors and VideoLAN
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
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*****************************************************************************/
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#include <vlc_tick.h>
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#include <vlc_arrays.h>
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#include <vlc_memstream.h>
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#include <vlc_list.h>
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int tt_OpenDemux( vlc_object_t* p_this );
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void tt_CloseDemux( vlc_object_t* p_demux );
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int tt_OpenDecoder ( vlc_object_t * );
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int tt_OpenEncoder ( vlc_object_t * );
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enum
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{
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TT_TIMINGS_UNSPEC = 0,
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TT_TIMINGS_PARALLEL,
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TT_TIMINGS_SEQUENTIAL,
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};
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#define TT_FRAME_RATE 30
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typedef struct
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{
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vlc_tick_t base;
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unsigned frames;
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//unsigned ticks;
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} tt_time_t;
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typedef struct
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{
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uint8_t i_type;
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tt_time_t begin;
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tt_time_t end;
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tt_time_t dur;
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} tt_timings_t;
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struct tt_searchkey
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{
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tt_time_t time;
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tt_time_t *p_last;
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};
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/* namespaces */
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#define TT_NS "http://www.w3.org/ns/ttml"
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#define TT_NS_PARAMETER TT_NS "#parameter"
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#define TT_NS_STYLING TT_NS "#styling"
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#define TT_NS_METADATA TT_NS "#metadata"
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#define TT_NS_PROFILE TT_NS "/profile/"
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#define TT_NS_FEATURE TT_NS "/feature/"
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#define TT_NS_EXTENSION TT_NS "/extension/"
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#define TT_NS_XML "http://www.w3.org/XML/1998/namespace"
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#define TT_NS_SMPTE_TT_EXT "http://www.smpte-ra.org/schemas/2052-1/2010/smpte-tt"
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typedef struct
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{
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struct vlc_list nodes;
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} tt_namespaces_t;
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void tt_namespaces_Init( tt_namespaces_t *nss );
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void tt_namespaces_Clean( tt_namespaces_t *nss );
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void tt_namespaces_Register( tt_namespaces_t *nss, const char *psz_prefix,
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const char *psz_uri );
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const char * tt_namespaces_GetURI( const tt_namespaces_t *nss,
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const char *psz_qn ); /* qn or prefix */
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const char * tt_namespaces_GetPrefix( const tt_namespaces_t *nss,
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const char *psz_uri );
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enum
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{
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TT_NODE_TYPE_ELEMENT,
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TT_NODE_TYPE_TEXT,
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};
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typedef struct tt_basenode_t tt_basenode_t;
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typedef struct tt_node_t tt_node_t;
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#define TT_NODE_BASE_MEMBERS \
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uint8_t i_type;\
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tt_node_t *p_parent;\
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tt_basenode_t *p_next;
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struct tt_basenode_t
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{
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TT_NODE_BASE_MEMBERS
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};
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struct tt_node_t
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{
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TT_NODE_BASE_MEMBERS
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tt_basenode_t *p_child;
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char *psz_node_name;
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tt_timings_t timings;
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vlc_dictionary_t attr_dict;
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char *psz_namespace;
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};
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typedef struct
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{
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TT_NODE_BASE_MEMBERS
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char *psz_text;
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} tt_textnode_t;
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static inline const char *tt_LocalName( const char *psz_qname )
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{
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const char *psz_local = strchr( psz_qname, ':' );
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return psz_local ? psz_local + 1 : psz_qname;
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}
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tt_textnode_t *tt_textnode_New( tt_node_t *p_parent, const char *psz_text );
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tt_textnode_t *tt_subtextnode_New( tt_node_t *p_parent, const char *psz_text, size_t );
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tt_node_t * tt_node_New( tt_node_t* p_parent, const char* psz_node_name, const char *psz_namespace );
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tt_node_t * tt_node_NewRead( xml_reader_t* reader, tt_node_t* p_parent, const char* psz_node_name,
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const char *psz_namespace );
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void tt_node_RecursiveDelete( tt_node_t *p_node );
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bool tt_node_Match( const tt_node_t *p_node, const char* psz_name, const char* psz_namespace );
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int tt_node_NameCompare( const char* psz_tagname, const char* psz_pattern );
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bool tt_node_HasChild( const tt_node_t *p_node );
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int tt_node_AddAttribute( tt_node_t *p_node, const char *key, const char *value );
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void tt_node_RemoveAttribute( tt_node_t *p_node, const char *key );
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int tt_nodes_Read( xml_reader_t *p_reader, tt_node_t *p_root_node );
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void tt_timings_Resolve( tt_basenode_t *p_child, const tt_timings_t *p_container_timings,
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tt_time_t **pp_array, size_t *pi_count );
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bool tt_timings_Contains( const tt_timings_t *p_range, const tt_time_t * );
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size_t tt_timings_FindLowerIndex( const tt_time_t *p_times, size_t i_times, tt_time_t time, bool *pb_found );
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static inline void tt_time_Init( tt_time_t *t )
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{
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t->base = -1;
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t->frames = 0;
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}
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static inline tt_time_t tt_time_Create( vlc_tick_t i )
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{
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tt_time_t t;
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t.base = i;
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t.frames = 0;
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return t;
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}
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static inline bool tt_time_Valid( const tt_time_t *t )
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{
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return t->base != -1;
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}
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static inline vlc_tick_t tt_time_Convert( const tt_time_t *t )
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{
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if( !tt_time_Valid( t ) )
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return VLC_TICK_INVALID;
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else
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return t->base + vlc_tick_from_samples( t->frames, TT_FRAME_RATE);
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}
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static inline int tt_time_Compare( const tt_time_t *t1, const tt_time_t *t2 )
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{
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vlc_tick_t ttt1 = tt_time_Convert( t1 );
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vlc_tick_t ttt2 = tt_time_Convert( t2 );
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if (ttt1 < ttt2)
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return -1;
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return ttt1 > ttt2;
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}
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static inline tt_time_t tt_time_Add( tt_time_t t1, tt_time_t t2 )
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{
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t1.base += t2.base;
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t1.frames += t2.frames;
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t1.base += vlc_tick_from_samples( t1.frames, TT_FRAME_RATE );
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t1.frames = t1.frames % TT_FRAME_RATE;
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return t1;
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}
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static inline tt_time_t tt_time_Sub( tt_time_t t1, tt_time_t t2 )
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{
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if( t2.frames > t1.frames )
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{
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unsigned diff = 1 + (t2.frames - t1.frames) / TT_FRAME_RATE;
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t1.base -= vlc_tick_from_sec( diff );
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t1.frames += diff * TT_FRAME_RATE;
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}
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t1.frames -= t2.frames;
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t1.base -= t2.base;
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return t1;
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}
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/* Encoding */
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char *tt_genTiming( tt_time_t t );
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void tt_node_AttributesToText( struct vlc_memstream *p_stream, const tt_node_t* p_node );
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void tt_node_ToText( struct vlc_memstream *p_stream, const tt_basenode_t *p_basenode,
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const tt_time_t *playbacktime );
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