1 /*****************************************************************************
2 * cvd.c : CVD Subtitle decoder thread
3 *****************************************************************************
4 * Copyright (C) 2003, 2004 VideoLAN
7 * Authors: Rocky Bernstein
9 * Julio Sanchez Fernandez (http://subhandler.sourceforge.net)
10 * Samuel Hocevar <sam@zoy.org>
11 * Laurent Aimar <fenrir@via.ecp.fr>
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
26 *****************************************************************************/
28 /*****************************************************************************
30 *****************************************************************************/
33 #include <vlc/decoder.h>
39 /*****************************************************************************
41 *****************************************************************************/
42 static int VCDSubOpen ( vlc_object_t * );
43 static int PacketizerOpen( vlc_object_t * );
46 set_description( _("CVD subtitle decoder") );
47 set_capability( "decoder", 50 );
48 set_callbacks( VCDSubOpen, VCDSubClose );
50 add_integer ( MODULE_STRING "-debug", 0, NULL,
51 DEBUG_TEXT, DEBUG_LONGTEXT, VLC_TRUE );
53 add_integer ( MODULE_STRING "-horizontal-correct", 0, NULL,
54 HORIZONTAL_CORRECT, HORIZONTAL_CORRECT_LONGTEXT, VLC_FALSE );
56 add_integer ( MODULE_STRING "-vertical-correct", 0, NULL,
57 VERTICAL_CORRECT, VERTICAL_CORRECT_LONGTEXT, VLC_FALSE );
59 add_string( MODULE_STRING "-aspect-ratio", "", NULL,
60 SUB_ASPECT_RATIO_TEXT, SUB_ASPECT_RATIO_LONGTEXT,
63 add_integer( MODULE_STRING "-duration-scaling", 3, NULL,
64 DURATION_SCALE_TEXT, DURATION_SCALE_LONGTEXT,
68 set_description( _("Chaoji VCD subtitle packetizer") );
69 set_capability( "packetizer", 50 );
70 set_callbacks( PacketizerOpen, VCDSubClose );
73 /*****************************************************************************
75 *****************************************************************************/
77 static block_t *Reassemble( decoder_t *, block_t ** );
78 static subpicture_t *Decode( decoder_t *, block_t ** );
79 static block_t *Packetize( decoder_t *, block_t ** );
81 /*****************************************************************************
83 *****************************************************************************
84 * Tries to launch a decoder and return score so that the interface is able
86 *****************************************************************************/
88 VCDSubOpen( vlc_object_t *p_this )
90 decoder_t *p_dec = (decoder_t*)p_this;
93 if( p_dec->fmt_in.i_codec != VLC_FOURCC( 'c','v','d',' ' ) )
99 p_dec->p_sys = p_sys = malloc( sizeof( decoder_sys_t ) );
101 p_sys->i_debug = config_GetInt( p_this, MODULE_STRING "-debug" );
102 p_sys->b_packetizer = VLC_FALSE;
103 p_sys->p_vout = NULL;
105 p_sys->subtitle_data = NULL;
107 VCDSubInitSubtitleBlock( p_sys );
109 es_format_Init( &p_dec->fmt_out, SPU_ES, VLC_FOURCC( 'c','v','d',' ' ) );
112 p_dec->pf_decode_sub = Decode;
113 p_dec->pf_packetize = Packetize;
115 dbg_print( (DECODE_DBG_CALL|DECODE_DBG_EXT) , "");
120 /*****************************************************************************
122 *****************************************************************************
123 * Tries to launch a decoder and return score so that the interface is able
125 *****************************************************************************/
126 static int PacketizerOpen( vlc_object_t *p_this )
128 decoder_t *p_dec = (decoder_t*)p_this;
130 if( VCDSubOpen( p_this ) )
134 p_dec->p_sys->b_packetizer = VLC_TRUE;
139 /*****************************************************************************
141 *****************************************************************************/
142 static subpicture_t *
143 Decode ( decoder_t *p_dec, block_t **pp_block )
145 decoder_sys_t *p_sys = p_dec->p_sys;
146 block_t *p_spu = Reassemble( p_dec, pp_block );
147 vout_thread_t *p_last_vout = p_dec->p_sys->p_vout;
149 dbg_print( (DECODE_DBG_CALL) , "");
153 p_sys->i_spu = block_ChainExtract( p_spu, p_sys->buffer, 65536 );
154 p_sys->i_pts = p_spu->i_pts;
155 block_ChainRelease( p_spu );
157 if( ( p_sys->p_vout = VCDSubFindVout( p_dec ) ) )
159 if( p_last_vout != p_sys->p_vout )
161 spu_Control( p_sys->p_vout->p_spu, SPU_CHANNEL_REGISTER,
162 &p_sys->i_subpic_channel );
165 /* Parse and decode */
166 E_(ParsePacket)( p_dec );
168 vlc_object_release( p_sys->p_vout );
171 VCDSubInitSubtitleBlock ( p_sys );
177 /*****************************************************************************
179 *****************************************************************************/
181 Packetize( decoder_t *p_dec, block_t **pp_block )
183 decoder_sys_t *p_sys = p_dec->p_sys;
184 block_t *p_spu = Reassemble( p_dec, pp_block );
188 p_spu->i_dts = p_spu->i_pts;
191 VCDSubInitSubtitleBlock( p_sys );
193 return block_ChainGather( p_spu );
198 /* following functions are local */
200 #define SPU_HEADER_LEN 1
202 /*****************************************************************************
205 Data for single screen subtitle may come in several non-contiguous
206 packets of a stream. This routine is called when the next packet in
207 the stream comes in. The job of this routine is to parse the header,
208 if this is the beginning, and combine the packets into one complete
211 If everything is complete, we will return a block. Otherwise return
214 *****************************************************************************/
216 Reassemble( decoder_t *p_dec, block_t **pp_block )
218 decoder_sys_t *p_sys = p_dec->p_sys;
222 if( pp_block == NULL || *pp_block == NULL )
229 if( p_block->i_buffer < SPU_HEADER_LEN )
231 msg_Dbg( p_dec, "invalid packet header (size %d < %d)" ,
232 p_block->i_buffer, SPU_HEADER_LEN );
233 block_Release( p_block );
237 p_buffer = p_block->p_buffer;
239 dbg_print( (DECODE_DBG_CALL|DECODE_DBG_PACKET),
240 "header: 0x%02x 0x%02x 0x%02x 0x%02x, 0x%02x, 0x%02x, size: %i",
241 p_buffer[1], p_buffer[2], p_buffer[3], p_buffer[4],
242 p_buffer[5], p_buffer[6],
246 /* Attach to our input thread and see if subtitle is selected. */
248 vlc_object_t * p_input;
251 p_input = vlc_object_find( p_dec, VLC_OBJECT_INPUT, FIND_PARENT );
253 if( !p_input ) return NULL;
255 if( var_Get( p_input, "spu-channel", &val ) )
257 vlc_object_release( p_input );
261 vlc_object_release( p_input );
263 /* Number could be 0bd, 1bd, 2bd, 3bd for 0..3. If so
266 if ( (val.i_int & 0xff) == 0xbd ) val.i_int >>= 8;
268 if( val.i_int == -1 || val.i_int != p_buffer[0] )
273 /* From the scant data on the format, there is only only way known
274 to detect the first packet in a subtitle. The first packet
275 seems to have a valid PTS while later packets for the same
278 if ( p_sys->state == SUBTITLE_BLOCK_EMPTY && p_block->i_pts == 0 ) {
280 "first packet expected but no PTS present -- skipped\n");
284 if ( p_sys->subtitle_data_pos == 0 ) {
285 /* First packet in the subtitle block */
286 E_(ParseHeader)( p_dec, p_buffer, p_block );
287 VCDSubInitSubtitleData(p_sys);
290 /* FIXME - remove append_data and use chainappend */
291 VCDSubAppendData( p_dec, p_buffer + SPU_HEADER_LEN,
292 p_block->i_buffer - SPU_HEADER_LEN );
294 block_ChainAppend( &p_sys->p_block, p_block );
296 p_sys->i_spu += p_block->i_buffer - SPU_HEADER_LEN;
298 if ( p_sys->subtitle_data_pos == p_sys->i_spu_size ) {
299 E_(ParseMetaInfo)( p_dec );
300 return p_sys->p_block;
302 /* Not last block in subtitle, so wait for another. */
303 p_sys->state = SUBTITLE_BLOCK_PARTIAL;