1 /*****************************************************************************
2 * cmml.c : CMML annotations/metadata decoder
3 *****************************************************************************
4 * Copyright (C) 2003-2004 Commonwealth Scientific and Industrial Research
5 * Organisation (CSIRO) Australia
6 * Copyright (C) 2004 the VideoLAN team
10 * Author: Andre Pang <Andre.Pang@csiro.au>
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
25 *****************************************************************************/
27 /*****************************************************************************
29 *****************************************************************************/
34 #include <vlc_common.h>
35 #include <vlc_plugin.h>
36 #include <vlc_input.h>
37 #include <vlc_codec.h>
39 #include <vlc_charset.h>
40 #include <vlc_interface.h>
45 /*****************************************************************************
46 * decoder_sys_t : decoder descriptor
47 *****************************************************************************/
50 intf_thread_t * p_intf;
53 /*****************************************************************************
55 *****************************************************************************/
56 static int OpenDecoder ( vlc_object_t * );
57 static void CloseDecoder ( vlc_object_t * );
59 static subpicture_t *DecodeBlock ( decoder_t *, block_t ** );
61 static void ParseText ( decoder_t *, block_t * );
63 /*****************************************************************************
65 *****************************************************************************/
66 int OpenIntf ( vlc_object_t * );
67 void CloseIntf ( vlc_object_t * );
69 /*****************************************************************************
71 *****************************************************************************/
73 set_description( N_("CMML annotations decoder") )
74 set_capability( "decoder", 50 )
75 set_callbacks( OpenDecoder, CloseDecoder )
76 add_shortcut( "cmml" )
79 set_capability( "interface", 0 )
80 set_callbacks( OpenIntf, CloseIntf )
83 /*****************************************************************************
84 * OpenDecoder: probe the decoder and return score
85 *****************************************************************************
86 * Tries to launch a decoder and return score so that the interface is able
88 *****************************************************************************/
89 static int OpenDecoder( vlc_object_t *p_this )
91 decoder_t *p_dec = (decoder_t*)p_this;
92 input_thread_t * p_input;
95 if( p_dec->fmt_in.i_codec != VLC_FOURCC('c','m','m','l') )
98 p_dec->pf_decode_sub = DecodeBlock;
100 /* Allocate the memory needed to store the decoder's structure */
101 if( ( p_dec->p_sys = p_sys = malloc( sizeof(*p_sys) ) ) == NULL )
104 /* Let other interested modules know that we're a CMML decoder
105 * We have to set this variable on the input thread, because there's
106 * typically more than one decoder running so we can't find the CMML
107 * decoder succesfully with vlc_object_find. (Any hints on how to achieve
108 * this would be rather appreciated ;) */
109 p_input = vlc_object_find( p_dec, VLC_OBJECT_INPUT, FIND_ANYWHERE );
115 msg_Dbg( p_dec, "p_input is at %p", p_input );
117 val.p_address = p_dec;
118 var_Create( p_input, "has-cmml-decoder",
119 VLC_VAR_ADDRESS|VLC_VAR_DOINHERIT );
121 if( var_Set( p_input, "has-cmml-decoder", val ) != VLC_SUCCESS )
122 msg_Dbg( p_dec, "var_Set of has-cmml-decoder failed" );
123 vlc_object_release( p_input );
126 /* initialise the CMML responder interface */
127 p_sys->p_intf = intf_Create( p_dec, "cmml" );
129 intf_RunThread( p_sys->p_intf );
131 p_dec->fmt_out.i_cat = SPU_ES;
132 p_dec->fmt_out.i_codec = 0;
137 /****************************************************************************
138 * DecodeBlock: the whole thing
139 ****************************************************************************
140 * This function must be fed with complete subtitles units.
141 ****************************************************************************/
142 static subpicture_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
146 if( !pp_block || *pp_block == NULL )
151 ParseText( p_dec, *pp_block );
153 block_Release( *pp_block );
156 /* allocate an empty subpicture to return. the actual subpicture
157 * displaying is done in the DisplayAnchor function in intf.c (called from
158 * DisplayPendingAnchor, which in turn is called from the main RunIntf
160 p_spu = decoder_NewSubpicture( p_dec );
163 msg_Dbg( p_dec, "couldn't allocate new subpicture" );
170 /*****************************************************************************
171 * CloseDecoder: clean up the decoder
172 *****************************************************************************/
173 static void CloseDecoder( vlc_object_t *p_this )
175 decoder_t *p_dec = (decoder_t *)p_this;
176 decoder_sys_t *p_sys = p_dec->p_sys;
178 /* Destroy the interface object/thread */
179 if( p_sys->p_intf != NULL )
181 intf_thread_t *p_intf = p_sys->p_intf;
182 intf_StopThread( p_intf );
183 vlc_object_detach( p_intf );
184 vlc_object_release( p_intf );
190 /*****************************************************************************
191 * ParseText: parse an text subtitle packet and send it to the video output
192 *****************************************************************************/
193 static void ParseText( decoder_t *p_dec, block_t *p_block )
195 char *psz_subtitle, *psz_cmml, *psz_url;
196 XTag *p_clip_parser, *p_anchor;
199 /* We cannot display a subpicture with no date */
200 if( p_block->i_pts == 0 )
202 msg_Warn( p_dec, "subtitle without a date" );
206 /* Check validity of packet data */
207 if( p_block->i_buffer <= 1 || p_block->p_buffer[0] == '\0' )
209 msg_Warn( p_dec, "empty subtitle" );
213 /* get anchor text from CMML */
215 /* Copy the whole CMML tag into our own buffer:
216 allocate i_buffer bytes + 1 for the terminating \0 */
217 if( (psz_cmml = malloc( p_block->i_buffer + 1 )) == NULL )
219 memcpy( psz_cmml, p_block->p_buffer, p_block->i_buffer );
220 psz_cmml[p_block->i_buffer] = '\0'; /* terminate the string */
222 msg_Dbg( p_dec, "psz_cmml is \"%s\"", psz_cmml );
225 /* Parse the <clip> part of the CMML */
226 p_clip_parser = xtag_new_parse( psz_cmml, p_block->i_buffer );
229 msg_Warn( p_dec, "couldn't initialise <clip> parser" );
234 /* Parse the anchor tag and get its contents */
235 p_anchor = xtag_first_child( p_clip_parser, "a" );
236 if( p_anchor != NULL )
238 psz_subtitle = xtag_get_pcdata( p_anchor );
242 psz_subtitle = strdup( " " );
246 msg_Dbg( p_dec, "psz_subtitle is \"%s\"", psz_subtitle );
249 /* get URL from the current clip, if one exists */
250 psz_url = xtag_get_attribute( p_anchor, "href" );
252 msg_Dbg( p_dec, "psz_url is \"%s\"", psz_url );
256 char *psz_tmp = strdup( psz_url );
258 val.p_address = psz_tmp;
259 if( var_Set( p_dec, "psz-current-anchor-url", val ) != VLC_SUCCESS )
261 var_Create( p_dec, "psz-current-anchor-url",
262 VLC_VAR_ADDRESS | VLC_VAR_DOINHERIT );
263 msg_Dbg( p_dec, "creating psz-current-anchor-url" );
264 if( var_Set( p_dec, "psz-current-anchor-url", val ) != VLC_SUCCESS )
265 msg_Dbg( p_dec, "var_Set of psz-current-anchor-url failed" );
271 char *psz_tmp = strdup( psz_subtitle );
273 val.p_address = psz_tmp;
274 if( var_Set( p_dec, "psz-current-anchor-description", val ) != VLC_SUCCESS )
276 var_Create( p_dec, "psz-current-anchor-description",
277 VLC_VAR_ADDRESS | VLC_VAR_DOINHERIT );
278 msg_Dbg( p_dec, "creating psz-current-anchor-description" );
279 if( var_Set( p_dec, "psz-current-anchor-description", val ) != VLC_SUCCESS )
280 msg_Dbg( p_dec, "var_Set of psz-current-anchor-description failed" );
285 free( psz_subtitle );
288 free( p_clip_parser );