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 *****************************************************************************/
33 #include <vlc_codec.h>
37 /*****************************************************************************
39 *****************************************************************************/
40 static int DecoderOpen ( vlc_object_t * );
41 static int PacketizerOpen( vlc_object_t * );
42 static void Close ( vlc_object_t * );
45 set_description( _("DVD subtitles decoder") );
46 set_capability( "decoder", 50 );
47 set_category( CAT_INPUT );
48 set_subcategory( SUBCAT_INPUT_SCODEC );
49 set_callbacks( DecoderOpen, Close );
52 set_description( _("DVD subtitles packetizer") );
53 set_capability( "packetizer", 50 );
54 set_callbacks( PacketizerOpen, Close );
57 /*****************************************************************************
59 *****************************************************************************/
60 static block_t * Reassemble( decoder_t *, block_t ** );
61 static subpicture_t * Decode ( decoder_t *, block_t ** );
62 static block_t * Packetize ( decoder_t *, block_t ** );
64 /*****************************************************************************
66 *****************************************************************************
67 * Tries to launch a decoder and return score so that the interface is able
69 *****************************************************************************/
70 static int DecoderOpen( vlc_object_t *p_this )
72 decoder_t *p_dec = (decoder_t*)p_this;
75 if( p_dec->fmt_in.i_codec != VLC_FOURCC( 's','p','u',' ' ) &&
76 p_dec->fmt_in.i_codec != VLC_FOURCC( 's','p','u','b' ) )
81 p_dec->p_sys = p_sys = malloc( sizeof( decoder_sys_t ) );
83 p_sys->b_packetizer = false;
84 p_sys->i_spu_size = 0;
86 p_sys->p_block = NULL;
88 es_format_Init( &p_dec->fmt_out, SPU_ES, VLC_FOURCC( 's','p','u',' ' ) );
90 p_dec->pf_decode_sub = Decode;
91 p_dec->pf_packetize = NULL;
96 /*****************************************************************************
98 *****************************************************************************
99 * Tries to launch a decoder and return score so that the interface is able
101 *****************************************************************************/
102 static int PacketizerOpen( vlc_object_t *p_this )
104 decoder_t *p_dec = (decoder_t*)p_this;
106 if( DecoderOpen( p_this ) )
110 p_dec->pf_packetize = Packetize;
111 p_dec->p_sys->b_packetizer = true;
112 es_format_Copy( &p_dec->fmt_out, &p_dec->fmt_in );
113 p_dec->fmt_out.i_codec = VLC_FOURCC( 's','p','u',' ' );
118 /*****************************************************************************
120 *****************************************************************************/
121 static void Close( vlc_object_t *p_this )
123 decoder_t *p_dec = (decoder_t*)p_this;
124 decoder_sys_t *p_sys = p_dec->p_sys;
128 block_ChainRelease( p_sys->p_block );
134 /*****************************************************************************
136 *****************************************************************************/
137 static subpicture_t *Decode( decoder_t *p_dec, block_t **pp_block )
139 decoder_sys_t *p_sys = p_dec->p_sys;
140 block_t *p_spu_block;
143 p_spu_block = Reassemble( p_dec, pp_block );
150 /* FIXME: what the, we shouldn’t need to allocate 64k of buffer --sam. */
151 p_sys->i_spu = block_ChainExtract( p_spu_block, p_sys->buffer, 65536 );
152 p_sys->i_pts = p_spu_block->i_pts;
153 block_ChainRelease( p_spu_block );
155 /* Parse and decode */
156 p_spu = E_(ParsePacket)( p_dec );
159 p_sys->i_spu_size = 0;
160 p_sys->i_rle_size = 0;
162 p_sys->p_block = NULL;
167 /*****************************************************************************
169 *****************************************************************************/
170 static block_t *Packetize( decoder_t *p_dec, block_t **pp_block )
172 decoder_sys_t *p_sys = p_dec->p_sys;
173 block_t *p_spu = Reassemble( p_dec, pp_block );
180 p_spu->i_dts = p_spu->i_pts;
184 p_sys->i_spu_size = 0;
185 p_sys->i_rle_size = 0;
187 p_sys->p_block = NULL;
189 return block_ChainGather( p_spu );
192 /*****************************************************************************
194 *****************************************************************************/
195 static block_t *Reassemble( decoder_t *p_dec, block_t **pp_block )
197 decoder_sys_t *p_sys = p_dec->p_sys;
200 if( pp_block == NULL || *pp_block == NULL ) return NULL;
204 if( p_sys->i_spu_size <= 0 &&
205 ( p_block->i_pts <= 0 || p_block->i_buffer < 4 ) )
207 msg_Dbg( p_dec, "invalid starting packet (size < 4 or pts <=0)" );
208 msg_Dbg( p_dec, "spu size: %d, i_pts: "I64Fd" i_buffer: %d",
209 p_sys->i_spu_size, p_block->i_pts, p_block->i_buffer );
210 block_Release( p_block );
214 block_ChainAppend( &p_sys->p_block, p_block );
215 p_sys->i_spu += p_block->i_buffer;
217 if( p_sys->i_spu_size <= 0 )
219 p_sys->i_spu_size = ( p_block->p_buffer[0] << 8 )|
220 p_block->p_buffer[1];
221 p_sys->i_rle_size = ( ( p_block->p_buffer[2] << 8 )|
222 p_block->p_buffer[3] ) - 4;
224 /* msg_Dbg( p_dec, "i_spu_size=%d i_rle=%d",
225 p_sys->i_spu_size, p_sys->i_rle_size ); */
227 if( p_sys->i_spu_size <= 0 || p_sys->i_rle_size >= p_sys->i_spu_size )
229 p_sys->i_spu_size = 0;
230 p_sys->i_rle_size = 0;
232 p_sys->p_block = NULL;
234 block_Release( p_block );
239 if( p_sys->i_spu >= p_sys->i_spu_size )
241 /* We have a complete sub */
242 if( p_sys->i_spu > p_sys->i_spu_size )
243 msg_Dbg( p_dec, "SPU packets size=%d should be %d",
244 p_sys->i_spu, p_sys->i_spu_size );
246 return p_sys->p_block;