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 );
49 set_category( CAT_INPUT );
50 set_subcategory( SUBCAT_INPUT_SCODEC );
52 add_integer ( MODULE_STRING "-debug", 0, NULL,
53 DEBUG_TEXT, DEBUG_LONGTEXT, VLC_TRUE );
55 add_integer ( MODULE_STRING "-horizontal-correct", 0, NULL,
56 HORIZONTAL_CORRECT, HORIZONTAL_CORRECT_LONGTEXT, VLC_FALSE );
58 add_integer ( MODULE_STRING "-vertical-correct", 0, NULL,
59 VERTICAL_CORRECT, VERTICAL_CORRECT_LONGTEXT, VLC_FALSE );
61 add_string( MODULE_STRING "-aspect-ratio", "", NULL,
62 SUB_ASPECT_RATIO_TEXT, SUB_ASPECT_RATIO_LONGTEXT,
65 add_integer( MODULE_STRING "-duration-scaling", 3, NULL,
66 DURATION_SCALE_TEXT, DURATION_SCALE_LONGTEXT,
70 set_description( _("Chaoji VCD subtitle packetizer") );
71 set_capability( "packetizer", 50 );
72 set_callbacks( PacketizerOpen, VCDSubClose );
75 /*****************************************************************************
77 *****************************************************************************/
79 static block_t *Reassemble( decoder_t *, block_t ** );
80 static subpicture_t *Decode( decoder_t *, block_t ** );
81 static block_t *Packetize( decoder_t *, block_t ** );
83 /*****************************************************************************
85 *****************************************************************************
86 * Tries to launch a decoder and return score so that the interface is able
88 *****************************************************************************/
90 VCDSubOpen( vlc_object_t *p_this )
92 decoder_t *p_dec = (decoder_t*)p_this;
95 if( p_dec->fmt_in.i_codec != VLC_FOURCC( 'c','v','d',' ' ) )
101 p_dec->p_sys = p_sys = malloc( sizeof( decoder_sys_t ) );
103 p_sys->i_debug = config_GetInt( p_this, MODULE_STRING "-debug" );
104 p_sys->b_packetizer = VLC_FALSE;
105 p_sys->p_vout = NULL;
107 p_sys->subtitle_data = NULL;
109 VCDSubInitSubtitleBlock( p_sys );
111 es_format_Init( &p_dec->fmt_out, SPU_ES, VLC_FOURCC( 'c','v','d',' ' ) );
114 p_dec->pf_decode_sub = Decode;
115 p_dec->pf_packetize = Packetize;
117 dbg_print( (DECODE_DBG_CALL|DECODE_DBG_EXT) , "");
122 /*****************************************************************************
124 *****************************************************************************
125 * Tries to launch a decoder and return score so that the interface is able
127 *****************************************************************************/
128 static int PacketizerOpen( vlc_object_t *p_this )
130 decoder_t *p_dec = (decoder_t*)p_this;
132 if( VCDSubOpen( p_this ) )
136 p_dec->p_sys->b_packetizer = VLC_TRUE;
141 /*****************************************************************************
143 *****************************************************************************/
144 static subpicture_t *
145 Decode ( decoder_t *p_dec, block_t **pp_block )
147 decoder_sys_t *p_sys = p_dec->p_sys;
148 block_t *p_spu = Reassemble( p_dec, pp_block );
149 vout_thread_t *p_last_vout = p_dec->p_sys->p_vout;
151 dbg_print( (DECODE_DBG_CALL) , "");
155 p_sys->i_spu = block_ChainExtract( p_spu, p_sys->buffer, 65536 );
156 p_sys->i_pts = p_spu->i_pts;
157 block_ChainRelease( p_spu );
159 if( ( p_sys->p_vout = VCDSubFindVout( p_dec ) ) )
161 if( p_last_vout != p_sys->p_vout )
163 spu_Control( p_sys->p_vout->p_spu, SPU_CHANNEL_REGISTER,
164 &p_sys->i_subpic_channel );
167 /* Parse and decode */
168 E_(ParsePacket)( p_dec );
170 vlc_object_release( p_sys->p_vout );
173 VCDSubInitSubtitleBlock ( p_sys );
179 /*****************************************************************************
181 *****************************************************************************/
183 Packetize( decoder_t *p_dec, block_t **pp_block )
185 decoder_sys_t *p_sys = p_dec->p_sys;
186 block_t *p_spu = Reassemble( p_dec, pp_block );
190 p_spu->i_dts = p_spu->i_pts;
193 VCDSubInitSubtitleBlock( p_sys );
195 return block_ChainGather( p_spu );
200 /* following functions are local */
202 #define SPU_HEADER_LEN 1
204 /*****************************************************************************
207 Data for single screen subtitle may come in several non-contiguous
208 packets of a stream. This routine is called when the next packet in
209 the stream comes in. The job of this routine is to parse the header,
210 if this is the beginning, and combine the packets into one complete
213 If everything is complete, we will return a block. Otherwise return
216 *****************************************************************************/
218 Reassemble( decoder_t *p_dec, block_t **pp_block )
220 decoder_sys_t *p_sys = p_dec->p_sys;
224 if( pp_block == NULL || *pp_block == NULL )
231 if( p_block->i_buffer < SPU_HEADER_LEN )
233 msg_Dbg( p_dec, "invalid packet header (size %d < %d)" ,
234 p_block->i_buffer, SPU_HEADER_LEN );
235 block_Release( p_block );
239 p_buffer = p_block->p_buffer;
241 dbg_print( (DECODE_DBG_CALL|DECODE_DBG_PACKET),
242 "header: 0x%02x 0x%02x 0x%02x 0x%02x, 0x%02x, 0x%02x, size: %i",
243 p_buffer[1], p_buffer[2], p_buffer[3], p_buffer[4],
244 p_buffer[5], p_buffer[6],
248 /* Attach to our input thread and see if subtitle is selected. */
250 vlc_object_t * p_input;
253 p_input = vlc_object_find( p_dec, VLC_OBJECT_INPUT, FIND_PARENT );
255 if( !p_input ) return NULL;
257 if( var_Get( p_input, "spu-channel", &val ) )
259 vlc_object_release( p_input );
263 vlc_object_release( p_input );
265 /* Number could be 0bd, 1bd, 2bd, 3bd for 0..3. If so
268 if ( (val.i_int & 0xff) == 0xbd ) val.i_int >>= 8;
270 if( val.i_int == -1 || val.i_int != p_buffer[0] )
275 /* From the scant data on the format, there is only only way known
276 to detect the first packet in a subtitle. The first packet
277 seems to have a valid PTS while later packets for the same
280 if ( p_sys->state == SUBTITLE_BLOCK_EMPTY && p_block->i_pts == 0 ) {
282 "first packet expected but no PTS present -- skipped\n");
286 if ( p_sys->subtitle_data_pos == 0 ) {
287 /* First packet in the subtitle block */
288 E_(ParseHeader)( p_dec, p_buffer, p_block );
289 VCDSubInitSubtitleData(p_sys);
292 /* FIXME - remove append_data and use chainappend */
293 VCDSubAppendData( p_dec, p_buffer + SPU_HEADER_LEN,
294 p_block->i_buffer - SPU_HEADER_LEN );
296 block_ChainAppend( &p_sys->p_block, p_block );
298 p_sys->i_spu += p_block->i_buffer - SPU_HEADER_LEN;
300 if ( p_sys->subtitle_data_pos == p_sys->i_spu_size ) {
301 E_(ParseMetaInfo)( p_dec );
302 return p_sys->p_block;
304 /* Not last block in subtitle, so wait for another. */
305 p_sys->state = SUBTITLE_BLOCK_PARTIAL;