1 /*****************************************************************************
2 * spudec.c : SPU decoder thread
3 *****************************************************************************
4 * Copyright (C) 2000-2001, 2006 the VideoLAN team
7 * Authors: Sam Hocevar <sam@zoy.org>
8 * Laurent Aimar <fenrir@via.ecp.fr>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
23 *****************************************************************************/
25 /*****************************************************************************
27 *****************************************************************************/
32 #include <vlc_common.h>
33 #include <vlc_plugin.h>
34 #include <vlc_codec.h>
38 /*****************************************************************************
40 *****************************************************************************/
41 static int DecoderOpen ( vlc_object_t * );
42 static int PacketizerOpen( vlc_object_t * );
43 static void Close ( vlc_object_t * );
46 set_description( N_("DVD subtitles decoder") );
47 set_capability( "decoder", 50 );
48 set_category( CAT_INPUT );
49 set_subcategory( SUBCAT_INPUT_SCODEC );
50 set_callbacks( DecoderOpen, Close );
53 set_description( N_("DVD subtitles packetizer") );
54 set_capability( "packetizer", 50 );
55 set_callbacks( PacketizerOpen, Close );
58 /*****************************************************************************
60 *****************************************************************************/
61 static block_t * Reassemble( decoder_t *, block_t ** );
62 static subpicture_t * Decode ( decoder_t *, block_t ** );
63 static block_t * Packetize ( decoder_t *, block_t ** );
65 /*****************************************************************************
67 *****************************************************************************
68 * Tries to launch a decoder and return score so that the interface is able
70 *****************************************************************************/
71 static int DecoderOpen( vlc_object_t *p_this )
73 decoder_t *p_dec = (decoder_t*)p_this;
76 if( p_dec->fmt_in.i_codec != VLC_FOURCC( 's','p','u',' ' ) &&
77 p_dec->fmt_in.i_codec != VLC_FOURCC( 's','p','u','b' ) )
82 p_dec->p_sys = p_sys = malloc( sizeof( decoder_sys_t ) );
84 p_sys->b_packetizer = false;
85 p_sys->i_spu_size = 0;
87 p_sys->p_block = NULL;
89 es_format_Init( &p_dec->fmt_out, SPU_ES, VLC_FOURCC( 's','p','u',' ' ) );
91 p_dec->pf_decode_sub = Decode;
92 p_dec->pf_packetize = NULL;
97 /*****************************************************************************
99 *****************************************************************************
100 * Tries to launch a decoder and return score so that the interface is able
102 *****************************************************************************/
103 static int PacketizerOpen( vlc_object_t *p_this )
105 decoder_t *p_dec = (decoder_t*)p_this;
107 if( DecoderOpen( p_this ) )
111 p_dec->pf_packetize = Packetize;
112 p_dec->p_sys->b_packetizer = true;
113 es_format_Copy( &p_dec->fmt_out, &p_dec->fmt_in );
114 p_dec->fmt_out.i_codec = VLC_FOURCC( 's','p','u',' ' );
119 /*****************************************************************************
121 *****************************************************************************/
122 static void Close( vlc_object_t *p_this )
124 decoder_t *p_dec = (decoder_t*)p_this;
125 decoder_sys_t *p_sys = p_dec->p_sys;
129 block_ChainRelease( p_sys->p_block );
135 /*****************************************************************************
137 *****************************************************************************/
138 static subpicture_t *Decode( decoder_t *p_dec, block_t **pp_block )
140 decoder_sys_t *p_sys = p_dec->p_sys;
141 block_t *p_spu_block;
144 p_spu_block = Reassemble( p_dec, pp_block );
151 /* FIXME: what the, we shouldn’t need to allocate 64k of buffer --sam. */
152 p_sys->i_spu = block_ChainExtract( p_spu_block, p_sys->buffer, 65536 );
153 p_sys->i_pts = p_spu_block->i_pts;
154 block_ChainRelease( p_spu_block );
156 /* Parse and decode */
157 p_spu = ParsePacket( p_dec );
160 p_sys->i_spu_size = 0;
161 p_sys->i_rle_size = 0;
163 p_sys->p_block = NULL;
168 /*****************************************************************************
170 *****************************************************************************/
171 static block_t *Packetize( decoder_t *p_dec, block_t **pp_block )
173 decoder_sys_t *p_sys = p_dec->p_sys;
174 block_t *p_spu = Reassemble( p_dec, pp_block );
181 p_spu->i_dts = p_spu->i_pts;
185 p_sys->i_spu_size = 0;
186 p_sys->i_rle_size = 0;
188 p_sys->p_block = NULL;
190 return block_ChainGather( p_spu );
193 /*****************************************************************************
195 *****************************************************************************/
196 static block_t *Reassemble( decoder_t *p_dec, block_t **pp_block )
198 decoder_sys_t *p_sys = p_dec->p_sys;
201 if( pp_block == NULL || *pp_block == NULL ) return NULL;
205 if( p_sys->i_spu_size <= 0 &&
206 ( p_block->i_pts <= 0 || p_block->i_buffer < 4 ) )
208 msg_Dbg( p_dec, "invalid starting packet (size < 4 or pts <=0)" );
209 msg_Dbg( p_dec, "spu size: %d, i_pts: %"PRId64" i_buffer: %zu",
210 p_sys->i_spu_size, p_block->i_pts, p_block->i_buffer );
211 block_Release( p_block );
215 block_ChainAppend( &p_sys->p_block, p_block );
216 p_sys->i_spu += p_block->i_buffer;
218 if( p_sys->i_spu_size <= 0 )
220 p_sys->i_spu_size = ( p_block->p_buffer[0] << 8 )|
221 p_block->p_buffer[1];
222 p_sys->i_rle_size = ( ( p_block->p_buffer[2] << 8 )|
223 p_block->p_buffer[3] ) - 4;
225 /* msg_Dbg( p_dec, "i_spu_size=%d i_rle=%d",
226 p_sys->i_spu_size, p_sys->i_rle_size ); */
228 if( p_sys->i_spu_size <= 0 || p_sys->i_rle_size >= p_sys->i_spu_size )
230 p_sys->i_spu_size = 0;
231 p_sys->i_rle_size = 0;
233 p_sys->p_block = NULL;
235 block_Release( p_block );
240 if( p_sys->i_spu >= p_sys->i_spu_size )
242 /* We have a complete sub */
243 if( p_sys->i_spu > p_sys->i_spu_size )
244 msg_Dbg( p_dec, "SPU packets size=%d should be %d",
245 p_sys->i_spu, p_sys->i_spu_size );
247 return p_sys->p_block;