subtitle_asa.c
资源名称:vlc-1.0.5.zip [点击查看]
上传用户:kjfoods
上传日期:2020-07-06
资源大小:29949k
文件大小:15k
源码类别:
midi
开发平台:
Unix_Linux
- /*****************************************************************************
- * subtitle_asa.c: Demux for subtitle text files using the asa engine.
- *****************************************************************************
- * Copyright (C) 1999-2007 the VideoLAN team
- * $Id: 7a654f302a40d0d776bb6e26a1d90d730c73b768 $
- *
- * Authors: David Lamparter <equinox at videolan dot org>
- *
- * Originated from subtitle.c
- *
- * Authors: Laurent Aimar <fenrir@via.ecp.fr>
- * Derk-Jan Hartman <hartman at videolan dot org>
- *
- * This program 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 2 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 General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
- *****************************************************************************/
- /*****************************************************************************
- * Preamble
- *****************************************************************************/
- #include "config.h"
- #include <vlc_common.h>
- #include <vlc_plugin.h>
- #include <vlc_input.h>
- #include <errno.h>
- #ifdef HAVE_SYS_TYPES_H
- # include <sys/types.h>
- #endif
- #include <ctype.h>
- #include <vlc_demux.h>
- #include <vlc_charset.h>
- #include "asademux.h"
- /*****************************************************************************
- * Module descriptor
- *****************************************************************************/
- static int Open ( vlc_object_t *p_this );
- static void Close( vlc_object_t *p_this );
- #define SUB_DELAY_LONGTEXT
- N_("Apply a delay to all subtitles (in 1/10s, eg 100 means 10s).")
- #define SUB_FPS_LONGTEXT
- N_("Override the normal frames per second settings. "
- "This will only affect frame-based subtitle formats without a fixed value.")
- #define SUB_TYPE_LONGTEXT
- N_("Force the subtiles format. Use "auto", the set of supported values varies.")
- vlc_module_begin ()
- set_shortname( N_("Subtitles (asa demuxer)"))
- set_description( N_("Text subtitles parser") )
- set_capability( "demux", 50 )
- set_category( CAT_INPUT )
- set_subcategory( SUBCAT_INPUT_DEMUX )
- add_float( "sub-fps", 0.0, NULL,
- N_("Frames per second"),
- SUB_FPS_LONGTEXT, true )
- add_integer( "sub-delay", 0, NULL,
- N_("Subtitles delay"),
- SUB_DELAY_LONGTEXT, true )
- add_string( "sub-type", "auto", NULL, N_("Subtitles format"),
- SUB_TYPE_LONGTEXT, true )
- set_callbacks( Open, Close )
- add_shortcut( "asademux" )
- vlc_module_end ()
- /*****************************************************************************
- * Prototypes:
- *****************************************************************************/
- typedef struct
- {
- int64_t i_start;
- int64_t i_stop;
- char *psz_text;
- } subtitle_t;
- struct demux_sys_t
- {
- int i_type;
- es_out_id_t *es;
- int64_t i_next_demux_date;
- int64_t i_microsecperframe;
- char *psz_header;
- int i_subtitle;
- int i_subtitles;
- int i_subs_alloc;
- subtitle_t *subtitle;
- int64_t i_length;
- };
- static int Demux( demux_t * );
- static int Control( demux_t *, int, va_list );
- static void Fix( demux_t * );
- static int ProcessLine( demux_t *, void *, int64_t, int64_t,
- const char *, size_t );
- /*****************************************************************************
- * Module initializer
- *****************************************************************************/
- static int Open ( vlc_object_t *p_this )
- {
- demux_t *p_demux = (demux_t*)p_this;
- demux_sys_t *p_sys;
- es_format_t fmt;
- input_thread_t *p_input;
- float f_fps;
- char *psz_type;
- int64_t i_ssize;
- void *p_data;
- struct asa_import_detect *p_detect = NULL;
- if( strcmp( p_demux->psz_demux, "asademux" ) )
- {
- return VLC_EGENERIC;
- }
- p_demux->pf_demux = Demux;
- p_demux->pf_control = Control;
- p_demux->p_sys = p_sys = malloc( sizeof( demux_sys_t ) );
- if( !p_sys )
- return VLC_ENOMEM;
- p_sys->psz_header = NULL;
- p_sys->i_subtitle = 0;
- p_sys->i_subtitles = 0;
- p_sys->i_subs_alloc = 0;
- p_sys->subtitle = NULL;
- p_sys->i_microsecperframe = 40000;
- /* Get the FPS */
- p_input = (input_thread_t *)vlc_object_find( p_demux, VLC_OBJECT_INPUT, FIND_PARENT );
- if( p_input )
- {
- f_fps = var_GetFloat( p_input, "sub-original-fps" );
- if( f_fps >= 1.0 )
- p_sys->i_microsecperframe = (int64_t)( (float)1000000 / f_fps );
- msg_Dbg( p_demux, "Movie fps: %f", f_fps );
- vlc_object_release( p_input );
- }
- /* Check for override of the fps */
- f_fps = var_CreateGetFloat( p_demux, "sub-fps" );
- if( f_fps >= 1.0 )
- {
- p_sys->i_microsecperframe = (int64_t)( (float)1000000 / f_fps );
- msg_Dbg( p_demux, "Override subtitle fps %f", f_fps );
- }
- /* Get or probe the type */
- psz_type = var_CreateGetString( p_demux, "sub-type" );
- if( *psz_type )
- {
- for( p_detect = asa_det_first; p_detect; p_detect = p_detect->next )
- {
- if( !strcmp( p_detect->name, psz_type ) )
- {
- break;
- }
- }
- if( !p_detect )
- {
- msg_Warn( p_demux, "unknown sub-type "%s"", psz_type );
- }
- }
- free( psz_type );
- /* Probe if unknown type */
- if( !p_detect )
- {
- int i_size;
- const uint8_t *p;
- msg_Dbg( p_demux, "autodetecting subtitle format" );
- i_size = stream_Peek( p_demux->s, &p, 4096 );
- if( i_size <= 0)
- {
- msg_Warn( p_demux, "cannot process subtitles (no data?)" );
- return VLC_EGENERIC;
- }
- p_detect = asa_imports_detect( p, i_size );
- }
- if( !p_detect )
- {
- msg_Err( p_demux, "failed to recognize subtitle type" );
- free( p_sys );
- return VLC_EGENERIC;
- }
- if( !p_detect->fmt )
- {
- msg_Err( p_demux, "detected %s subtitle format, no asa support", p_detect->name );
- free( p_sys );
- return VLC_EGENERIC;
- }
- msg_Dbg( p_demux, "detected %s subtitle format", p_detect->name );
- stream_Control( p_demux->s, STREAM_GET_SIZE, &i_ssize );
- p_data = malloc( i_ssize );
- if( !p_data )
- {
- free( p_sys );
- return VLC_ENOMEM;
- }
- if( stream_Read( p_demux->s, &p_data, i_ssize ) != i_ssize )
- {
- msg_Err( p_demux, "subtitle stream read error" );
- free( p_data );
- free( p_sys );
- return VLC_EGENERIC;
- }
- asa_import( p_demux, p_data, i_ssize, p_sys->i_microsecperframe, p_detect,
- ProcessLine, NULL );
- free( p_data );
- msg_Dbg(p_demux, "loaded %d subtitles", p_sys->i_subtitles );
- /* Fix subtitle (order and time) *** */
- Fix( p_demux );
- p_sys->i_subtitle = 0;
- p_sys->i_length = 0;
- if( p_sys->i_subtitles > 0 )
- {
- p_sys->i_length = p_sys->subtitle[p_sys->i_subtitles-1].i_stop;
- /* +1 to avoid 0 */
- if( p_sys->i_length <= 0 )
- p_sys->i_length = p_sys->subtitle[p_sys->i_subtitles-1].i_start+1;
- }
- /* *** add subtitle ES *** */
- if( p_detect->fmt->target == ASAI_TARGET_SSA )
- {
- es_format_Init( &fmt, SPU_ES, VLC_FOURCC( 's','s','a',' ' ) );
- }
- else
- {
- es_format_Init( &fmt, SPU_ES, VLC_FOURCC( 's','u','b','t' ) );
- }
- p_sys->es = es_out_Add( p_demux->out, &fmt );
- return VLC_SUCCESS;
- }
- /*****************************************************************************
- * ProcessLine: Callback for asa_import, fed one line
- * (note: return values are not kept. nonzero signals abort to asa_import)
- *****************************************************************************/
- static int ProcessLine( demux_t *p_demux, void *p_arg,
- int64_t i_start, int64_t i_stop,
- const char *p_buffer, size_t i_buffer_length )
- {
- demux_sys_t *p_sys = p_demux->p_sys;
- subtitle_t *p_subtitle;
- char *psz_text;
- VLC_UNUSED(p_arg);
- if( p_sys->i_subtitles >= p_sys->i_subs_alloc )
- {
- p_sys->i_subs_alloc += 500;
- if( !( p_sys->subtitle = realloc( p_sys->subtitle, sizeof(subtitle_t)
- * p_sys->i_subs_alloc ) ) )
- {
- return VLC_ENOMEM;
- }
- }
- p_subtitle = &p_sys->subtitle[p_sys->i_subtitles];
- psz_text = malloc( i_buffer_length + 1 );
- if( !psz_text )
- return VLC_ENOMEM;
- memcpy( psz_text, p_buffer, i_buffer_length );
- psz_text[i_buffer_length] = ' ';
- p_subtitle->i_start = i_start;
- p_subtitle->i_stop = i_stop;
- p_subtitle->psz_text = psz_text;
- p_sys->i_subtitles++;
- return VLC_SUCCESS;
- }
- /*****************************************************************************
- * Close: Close subtitle demux
- *****************************************************************************/
- static void Close( vlc_object_t *p_this )
- {
- demux_t *p_demux = (demux_t*)p_this;
- demux_sys_t *p_sys = p_demux->p_sys;
- int i;
- for( i = 0; i < p_sys->i_subtitles; i++ )
- free( p_sys->subtitle[i].psz_text );
- free( p_sys->subtitle );
- free( p_sys );
- }
- /*****************************************************************************
- * Control:
- *****************************************************************************/
- static int Control( demux_t *p_demux, int i_query, va_list args )
- {
- demux_sys_t *p_sys = p_demux->p_sys;
- int64_t *pi64, i64;
- double *pf, f;
- switch( i_query )
- {
- case DEMUX_GET_LENGTH:
- pi64 = (int64_t*)va_arg( args, int64_t * );
- *pi64 = p_sys->i_length;
- return VLC_SUCCESS;
- case DEMUX_GET_TIME:
- pi64 = (int64_t*)va_arg( args, int64_t * );
- if( p_sys->i_subtitle < p_sys->i_subtitles )
- {
- *pi64 = p_sys->subtitle[p_sys->i_subtitle].i_start;
- return VLC_SUCCESS;
- }
- return VLC_EGENERIC;
- case DEMUX_SET_TIME:
- i64 = (int64_t)va_arg( args, int64_t );
- p_sys->i_subtitle = 0;
- while( p_sys->i_subtitle < p_sys->i_subtitles &&
- p_sys->subtitle[p_sys->i_subtitle].i_start < i64 )
- {
- p_sys->i_subtitle++;
- }
- if( p_sys->i_subtitle >= p_sys->i_subtitles )
- return VLC_EGENERIC;
- return VLC_SUCCESS;
- case DEMUX_GET_POSITION:
- pf = (double*)va_arg( args, double * );
- if( p_sys->i_subtitle >= p_sys->i_subtitles )
- {
- *pf = 1.0;
- }
- else if( p_sys->i_subtitles > 0 )
- {
- *pf = (double)p_sys->subtitle[p_sys->i_subtitle].i_start /
- (double)p_sys->i_length;
- }
- else
- {
- *pf = 0.0;
- }
- return VLC_SUCCESS;
- case DEMUX_SET_POSITION:
- f = (double)va_arg( args, double );
- i64 = f * p_sys->i_length;
- p_sys->i_subtitle = 0;
- while( p_sys->i_subtitle < p_sys->i_subtitles &&
- p_sys->subtitle[p_sys->i_subtitle].i_start < i64 )
- {
- p_sys->i_subtitle++;
- }
- if( p_sys->i_subtitle >= p_sys->i_subtitles )
- return VLC_EGENERIC;
- return VLC_SUCCESS;
- case DEMUX_SET_NEXT_DEMUX_TIME:
- p_sys->i_next_demux_date = (int64_t)va_arg( args, int64_t );
- return VLC_SUCCESS;
- case DEMUX_GET_FPS:
- case DEMUX_GET_META:
- case DEMUX_GET_ATTACHMENTS:
- case DEMUX_GET_TITLE_INFO:
- return VLC_EGENERIC;
- default:
- msg_Err( p_demux, "unknown query in subtitle control" );
- return VLC_EGENERIC;
- }
- }
- /*****************************************************************************
- * Demux: Send subtitle to decoder
- *****************************************************************************/
- static int Demux( demux_t *p_demux )
- {
- demux_sys_t *p_sys = p_demux->p_sys;
- int64_t i_maxdate;
- if( p_sys->i_subtitle >= p_sys->i_subtitles )
- return 0;
- i_maxdate = p_sys->i_next_demux_date - var_GetTime( p_demux->p_parent, "spu-delay" );;
- if( i_maxdate <= 0 && p_sys->i_subtitle < p_sys->i_subtitles )
- {
- /* Should not happen */
- i_maxdate = p_sys->subtitle[p_sys->i_subtitle].i_start + 1;
- }
- while( p_sys->i_subtitle < p_sys->i_subtitles &&
- p_sys->subtitle[p_sys->i_subtitle].i_start < i_maxdate )
- {
- block_t *p_block;
- int i_len = strlen( p_sys->subtitle[p_sys->i_subtitle].psz_text ) + 1;
- if( i_len <= 1 )
- {
- /* empty subtitle */
- p_sys->i_subtitle++;
- continue;
- }
- if( ( p_block = block_New( p_demux, i_len ) ) == NULL )
- {
- p_sys->i_subtitle++;
- continue;
- }
- if( p_sys->subtitle[p_sys->i_subtitle].i_start < 0 )
- {
- p_sys->i_subtitle++;
- continue;
- }
- p_block->i_pts = p_sys->subtitle[p_sys->i_subtitle].i_start;
- p_block->i_dts = p_block->i_pts;
- if( p_sys->subtitle[p_sys->i_subtitle].i_stop > 0 )
- {
- p_block->i_length =
- p_sys->subtitle[p_sys->i_subtitle].i_stop - p_block->i_pts;
- }
- memcpy( p_block->p_buffer,
- p_sys->subtitle[p_sys->i_subtitle].psz_text, i_len );
- if( p_block->i_pts > 0 )
- {
- es_out_Send( p_demux->out, p_sys->es, p_block );
- }
- else
- {
- block_Release( p_block );
- }
- p_sys->i_subtitle++;
- }
- /* */
- p_sys->i_next_demux_date = 0;
- return 1;
- }
- /*****************************************************************************
- * Fix: fix time stamp and order of subtitle
- *****************************************************************************/
- static void Fix( demux_t *p_demux )
- {
- demux_sys_t *p_sys = p_demux->p_sys;
- bool b_done;
- int i_index;
- /* *** fix order (to be sure...) *** */
- /* We suppose that there are near in order and this durty bubble sort
- * wont take too much time
- */
- do
- {
- b_done = true;
- for( i_index = 1; i_index < p_sys->i_subtitles; i_index++ )
- {
- if( p_sys->subtitle[i_index].i_start <
- p_sys->subtitle[i_index - 1].i_start )
- {
- subtitle_t sub_xch;
- memcpy( &sub_xch,
- p_sys->subtitle + i_index - 1,
- sizeof( subtitle_t ) );
- memcpy( p_sys->subtitle + i_index - 1,
- p_sys->subtitle + i_index,
- sizeof( subtitle_t ) );
- memcpy( p_sys->subtitle + i_index,
- &sub_xch,
- sizeof( subtitle_t ) );
- b_done = false;
- }
- }
- } while( !b_done );
- }