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 *****************************************************************************/
29 #include <vlc_codec.h>
33 /*****************************************************************************
35 *****************************************************************************/
36 static int DecoderOpen ( vlc_object_t * );
37 static int PacketizerOpen( vlc_object_t * );
38 static void Close ( vlc_object_t * );
41 set_description( _("DVD subtitles decoder") );
42 set_capability( "decoder", 50 );
43 set_category( CAT_INPUT );
44 set_subcategory( SUBCAT_INPUT_SCODEC );
45 set_callbacks( DecoderOpen, Close );
48 set_description( _("DVD subtitles packetizer") );
49 set_capability( "packetizer", 50 );
50 set_callbacks( PacketizerOpen, Close );
53 /*****************************************************************************
55 *****************************************************************************/
56 static block_t * Reassemble( decoder_t *, block_t ** );
57 static subpicture_t * Decode ( decoder_t *, block_t ** );
58 static block_t * Packetize ( decoder_t *, block_t ** );
60 /*****************************************************************************
62 *****************************************************************************
63 * Tries to launch a decoder and return score so that the interface is able
65 *****************************************************************************/
66 static int DecoderOpen( vlc_object_t *p_this )
68 decoder_t *p_dec = (decoder_t*)p_this;
71 if( p_dec->fmt_in.i_codec != VLC_FOURCC( 's','p','u',' ' ) &&
72 p_dec->fmt_in.i_codec != VLC_FOURCC( 's','p','u','b' ) )
77 p_dec->p_sys = p_sys = malloc( sizeof( decoder_sys_t ) );
79 p_sys->b_packetizer = VLC_FALSE;
80 p_sys->i_spu_size = 0;
82 p_sys->p_block = NULL;
84 es_format_Init( &p_dec->fmt_out, SPU_ES, VLC_FOURCC( 's','p','u',' ' ) );
86 p_dec->pf_decode_sub = Decode;
87 p_dec->pf_packetize = NULL;
92 /*****************************************************************************
94 *****************************************************************************
95 * Tries to launch a decoder and return score so that the interface is able
97 *****************************************************************************/
98 static int PacketizerOpen( vlc_object_t *p_this )
100 decoder_t *p_dec = (decoder_t*)p_this;
102 if( DecoderOpen( p_this ) )
106 p_dec->pf_packetize = Packetize;
107 p_dec->p_sys->b_packetizer = VLC_TRUE;
108 es_format_Copy( &p_dec->fmt_out, &p_dec->fmt_in );
109 p_dec->fmt_out.i_codec = VLC_FOURCC( 's','p','u',' ' );
114 /*****************************************************************************
116 *****************************************************************************/
117 static void Close( vlc_object_t *p_this )
119 decoder_t *p_dec = (decoder_t*)p_this;
120 decoder_sys_t *p_sys = p_dec->p_sys;
124 block_ChainRelease( p_sys->p_block );
130 /*****************************************************************************
132 *****************************************************************************/
133 static subpicture_t *Decode( decoder_t *p_dec, block_t **pp_block )
135 decoder_sys_t *p_sys = p_dec->p_sys;
136 block_t *p_spu_block;
139 p_spu_block = Reassemble( p_dec, pp_block );
146 /* FIXME: what the, we shouldn’t need to allocate 64k of buffer --sam. */
147 p_sys->i_spu = block_ChainExtract( p_spu_block, p_sys->buffer, 65536 );
148 p_sys->i_pts = p_spu_block->i_pts;
149 block_ChainRelease( p_spu_block );
151 /* Parse and decode */
152 p_spu = E_(ParsePacket)( p_dec );
155 p_sys->i_spu_size = 0;
156 p_sys->i_rle_size = 0;
158 p_sys->p_block = NULL;
163 /*****************************************************************************
165 *****************************************************************************/
166 static block_t *Packetize( decoder_t *p_dec, block_t **pp_block )
168 decoder_sys_t *p_sys = p_dec->p_sys;
169 block_t *p_spu = Reassemble( p_dec, pp_block );
176 p_spu->i_dts = p_spu->i_pts;
180 p_sys->i_spu_size = 0;
181 p_sys->i_rle_size = 0;
183 p_sys->p_block = NULL;
185 return block_ChainGather( p_spu );
188 /*****************************************************************************
190 *****************************************************************************/
191 static block_t *Reassemble( decoder_t *p_dec, block_t **pp_block )
193 decoder_sys_t *p_sys = p_dec->p_sys;
196 if( pp_block == NULL || *pp_block == NULL ) return NULL;
200 if( p_sys->i_spu_size <= 0 &&
201 ( p_block->i_pts <= 0 || p_block->i_buffer < 4 ) )
203 msg_Dbg( p_dec, "invalid starting packet (size < 4 or pts <=0)" );
204 msg_Dbg( p_dec, "spu size: %d, i_pts: "I64Fd" i_buffer: %d",
205 p_sys->i_spu_size, p_block->i_pts, p_block->i_buffer );
206 block_Release( p_block );
210 block_ChainAppend( &p_sys->p_block, p_block );
211 p_sys->i_spu += p_block->i_buffer;
213 if( p_sys->i_spu_size <= 0 )
215 p_sys->i_spu_size = ( p_block->p_buffer[0] << 8 )|
216 p_block->p_buffer[1];
217 p_sys->i_rle_size = ( ( p_block->p_buffer[2] << 8 )|
218 p_block->p_buffer[3] ) - 4;
220 /* msg_Dbg( p_dec, "i_spu_size=%d i_rle=%d",
221 p_sys->i_spu_size, p_sys->i_rle_size ); */
223 if( p_sys->i_spu_size <= 0 || p_sys->i_rle_size >= p_sys->i_spu_size )
225 p_sys->i_spu_size = 0;
226 p_sys->i_rle_size = 0;
228 p_sys->p_block = NULL;
230 block_Release( p_block );
235 if( p_sys->i_spu >= p_sys->i_spu_size )
237 /* We have a complete sub */
238 if( p_sys->i_spu > p_sys->i_spu_size )
239 msg_Dbg( p_dec, "SPU packets size=%d should be %d",
240 p_sys->i_spu, p_sys->i_spu_size );
242 return p_sys->p_block;