1 /*****************************************************************************
2 * cvd.c : CVD Subtitle decoder thread
3 *****************************************************************************
4 * Copyright (C) 2003 VideoLAN
5 * $Id: cvd.c,v 1.10 2004/01/14 11:47:19 rocky Exp $
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 DecoderOpen ( vlc_object_t * );
43 static int PacketizerOpen( vlc_object_t * );
46 set_description( _("CVD subtitle decoder") );
47 set_capability( "decoder", 50 );
48 set_callbacks( DecoderOpen, VCDSubClose );
50 add_integer ( MODULE_STRING "-debug", 0, NULL,
51 N_("set debug mask for additional debugging."),
52 N_(DEBUG_LONGTEXT), VLC_TRUE );
54 add_string( "sub-aspect-ratio", "", NULL,
55 SUB_ASPECT_RATIO_TEXT, SUB_ASPECT_RATIO_LONGTEXT,
58 add_integer( MODULE_STRING "-duration-scaling", 9, NULL,
59 DURATION_SCALE_TEXT, DURATION_SCALE_LONGTEXT,
63 set_description( _("Chaoji VCD subtitle packetizer") );
64 set_capability( "packetizer", 50 );
65 set_callbacks( PacketizerOpen, VCDSubClose );
68 /*****************************************************************************
70 *****************************************************************************/
72 static block_t *Reassemble( decoder_t *, block_t ** );
73 static void Decode ( decoder_t *, block_t ** );
74 static block_t *Packetize( decoder_t *, block_t ** );
77 /*****************************************************************************
79 *****************************************************************************
80 * Tries to launch a decoder and return score so that the interface is able
82 *****************************************************************************/
84 DecoderOpen( vlc_object_t *p_this )
86 decoder_t *p_dec = (decoder_t*)p_this;
89 if( p_dec->fmt_in.i_codec != VLC_FOURCC( 'c','v','d',' ' ) )
95 p_dec->p_sys = p_sys = malloc( sizeof( decoder_sys_t ) );
97 p_sys->i_debug = config_GetInt( p_this, MODULE_STRING "-debug" );
98 p_sys->b_packetizer = VLC_FALSE;
101 p_sys->subtitle_data = NULL;
103 VCDSubInitSubtitleBlock( p_sys );
105 es_format_Init( &p_dec->fmt_out, SPU_ES, VLC_FOURCC( 'c','v','d',' ' ) );
108 p_dec->pf_decode_sub = Decode;
109 p_dec->pf_packetize = Packetize;
111 dbg_print( (DECODE_DBG_CALL|DECODE_DBG_EXT) , "");
116 /*****************************************************************************
118 *****************************************************************************
119 * Tries to launch a decoder and return score so that the interface is able
121 *****************************************************************************/
122 static int PacketizerOpen( vlc_object_t *p_this )
124 decoder_t *p_dec = (decoder_t*)p_this;
126 if( DecoderOpen( p_this ) )
130 p_dec->p_sys->b_packetizer = VLC_TRUE;
135 /*****************************************************************************
137 *****************************************************************************/
139 Decode ( decoder_t *p_dec, block_t **pp_block )
141 decoder_sys_t *p_sys = p_dec->p_sys;
142 block_t *p_spu = Reassemble( p_dec, pp_block );
144 dbg_print( (DECODE_DBG_CALL) , "");
148 p_sys->i_spu = block_ChainExtract( p_spu, p_sys->buffer, 65536 );
149 p_sys->i_pts = p_spu->i_pts;
150 block_ChainRelease( p_spu );
152 if( ( p_sys->p_vout = VCDSubFindVout( p_dec ) ) )
154 /* Parse and decode */
155 E_(ParsePacket)( p_dec );
157 vlc_object_release( p_sys->p_vout );
160 VCDSubInitSubtitleBlock ( p_sys );
165 /*****************************************************************************
167 *****************************************************************************/
169 Packetize( decoder_t *p_dec, block_t **pp_block )
171 decoder_sys_t *p_sys = p_dec->p_sys;
172 block_t *p_spu = Reassemble( p_dec, pp_block );
176 p_spu->i_dts = p_spu->i_pts;
179 VCDSubInitSubtitleBlock( p_sys );
181 return block_ChainGather( p_spu );
186 /* following functions are local */
188 #define SPU_HEADER_LEN 1
190 /*****************************************************************************
193 Data for single screen subtitle may come in several non-contiguous
194 packets of a stream. This routine is called when the next packet in
195 the stream comes in. The job of this routine is to parse the header,
196 if this is the beginning, and combine the packets into one complete
199 If everything is complete, we will return a block. Otherwise return
202 *****************************************************************************/
204 Reassemble( decoder_t *p_dec, block_t **pp_block )
206 decoder_sys_t *p_sys = p_dec->p_sys;
210 if( pp_block == NULL || *pp_block == NULL )
217 if( p_block->i_buffer < SPU_HEADER_LEN )
219 msg_Dbg( p_dec, "invalid packet header (size %d < %d)" ,
220 p_block->i_buffer, SPU_HEADER_LEN );
221 block_Release( p_block );
225 p_buffer = p_block->p_buffer;
227 dbg_print( (DECODE_DBG_CALL|DECODE_DBG_PACKET),
228 "header: 0x%02x 0x%02x 0x%02x 0x%02x, 0x%02x, 0x%02x, size: %i",
229 p_buffer[1], p_buffer[2], p_buffer[3], p_buffer[4],
230 p_buffer[5], p_buffer[6],
233 if( config_GetInt( p_dec, "spu-channel" ) != p_buffer[0] )
236 /* From the scant data on the format, there is only only way known
237 to detect the first packet in a subtitle. The first packet
238 seems to have a valid PTS while later packets for the same
241 if ( p_sys->state == SUBTITLE_BLOCK_EMPTY && p_block->i_pts == 0 ) {
243 "first packet expected but no PTS present -- skipped\n");
247 if ( p_sys->subtitle_data_pos == 0 ) {
248 /* First packet in the subtitle block */
249 E_(ParseHeader)( p_dec, p_buffer, p_block );
250 VCDSubInitSubtitleData(p_sys);
253 /* FIXME - remove append_data and use chainappend */
254 VCDSubAppendData( p_dec, p_buffer + SPU_HEADER_LEN,
255 p_block->i_buffer - SPU_HEADER_LEN );
257 block_ChainAppend( &p_sys->p_block, p_block );
259 p_sys->i_spu += p_block->i_buffer - SPU_HEADER_LEN;
261 if ( p_sys->subtitle_data_pos == p_sys->i_spu_size ) {
262 E_(ParseMetaInfo)( p_dec );
263 return p_sys->p_block;
265 /* Not last block in subtitle, so wait for another. */
266 p_sys->state = SUBTITLE_BLOCK_PARTIAL;