1 /*****************************************************************************
2 * cvd.c : CVD Subtitle decoder thread
3 *****************************************************************************
4 * Copyright (C) 2003, 2004 VideoLAN
5 * $Id: cvd.c,v 1.13 2004/01/23 08:36:48 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_integer ( MODULE_STRING "-horizontal-correct", 0, NULL,
55 HORIZONTAL_CORRECT, HORIZONTAL_CORRECT_LONGTEXT, VLC_FALSE );
57 add_integer ( MODULE_STRING "-vertical-correct", 0, NULL,
58 VERTICAL_CORRECT, VERTICAL_CORRECT_LONGTEXT, VLC_FALSE );
60 add_string( MODULE_STRING "-aspect-ratio", "", NULL,
61 SUB_ASPECT_RATIO_TEXT, SUB_ASPECT_RATIO_LONGTEXT,
64 add_integer( MODULE_STRING "-duration-scaling", 9, NULL,
65 DURATION_SCALE_TEXT, DURATION_SCALE_LONGTEXT,
69 set_description( _("Chaoji VCD subtitle packetizer") );
70 set_capability( "packetizer", 50 );
71 set_callbacks( PacketizerOpen, VCDSubClose );
74 /*****************************************************************************
76 *****************************************************************************/
78 static block_t *Reassemble( decoder_t *, block_t ** );
79 static void Decode ( decoder_t *, block_t ** );
80 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 DecoderOpen( 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( DecoderOpen( p_this ) )
136 p_dec->p_sys->b_packetizer = VLC_TRUE;
141 /*****************************************************************************
143 *****************************************************************************/
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 );
150 dbg_print( (DECODE_DBG_CALL) , "");
154 p_sys->i_spu = block_ChainExtract( p_spu, p_sys->buffer, 65536 );
155 p_sys->i_pts = p_spu->i_pts;
156 block_ChainRelease( p_spu );
158 if( ( p_sys->p_vout = VCDSubFindVout( p_dec ) ) )
160 /* Parse and decode */
161 E_(ParsePacket)( p_dec );
163 vlc_object_release( p_sys->p_vout );
166 VCDSubInitSubtitleBlock ( p_sys );
171 /*****************************************************************************
173 *****************************************************************************/
175 Packetize( decoder_t *p_dec, block_t **pp_block )
177 decoder_sys_t *p_sys = p_dec->p_sys;
178 block_t *p_spu = Reassemble( p_dec, pp_block );
182 p_spu->i_dts = p_spu->i_pts;
185 VCDSubInitSubtitleBlock( p_sys );
187 return block_ChainGather( p_spu );
192 /* following functions are local */
194 #define SPU_HEADER_LEN 1
196 /*****************************************************************************
199 Data for single screen subtitle may come in several non-contiguous
200 packets of a stream. This routine is called when the next packet in
201 the stream comes in. The job of this routine is to parse the header,
202 if this is the beginning, and combine the packets into one complete
205 If everything is complete, we will return a block. Otherwise return
208 *****************************************************************************/
210 Reassemble( decoder_t *p_dec, block_t **pp_block )
212 decoder_sys_t *p_sys = p_dec->p_sys;
216 if( pp_block == NULL || *pp_block == NULL )
223 if( p_block->i_buffer < SPU_HEADER_LEN )
225 msg_Dbg( p_dec, "invalid packet header (size %d < %d)" ,
226 p_block->i_buffer, SPU_HEADER_LEN );
227 block_Release( p_block );
231 p_buffer = p_block->p_buffer;
233 dbg_print( (DECODE_DBG_CALL|DECODE_DBG_PACKET),
234 "header: 0x%02x 0x%02x 0x%02x 0x%02x, 0x%02x, 0x%02x, size: %i",
235 p_buffer[1], p_buffer[2], p_buffer[3], p_buffer[4],
236 p_buffer[5], p_buffer[6],
239 if( config_GetInt( p_dec, "spu-channel" ) != p_buffer[0] )
242 /* From the scant data on the format, there is only only way known
243 to detect the first packet in a subtitle. The first packet
244 seems to have a valid PTS while later packets for the same
247 if ( p_sys->state == SUBTITLE_BLOCK_EMPTY && p_block->i_pts == 0 ) {
249 "first packet expected but no PTS present -- skipped\n");
253 if ( p_sys->subtitle_data_pos == 0 ) {
254 /* First packet in the subtitle block */
255 E_(ParseHeader)( p_dec, p_buffer, p_block );
256 VCDSubInitSubtitleData(p_sys);
259 /* FIXME - remove append_data and use chainappend */
260 VCDSubAppendData( p_dec, p_buffer + SPU_HEADER_LEN,
261 p_block->i_buffer - SPU_HEADER_LEN );
263 block_ChainAppend( &p_sys->p_block, p_block );
265 p_sys->i_spu += p_block->i_buffer - SPU_HEADER_LEN;
267 if ( p_sys->subtitle_data_pos == p_sys->i_spu_size ) {
268 E_(ParseMetaInfo)( p_dec );
269 return p_sys->p_block;
271 /* Not last block in subtitle, so wait for another. */
272 p_sys->state = SUBTITLE_BLOCK_PARTIAL;