1 /*****************************************************************************
2 * spudec.c : SPU decoder thread
3 *****************************************************************************
4 * Copyright (C) 2000-2001 VideoLAN
7 * Authors: Samuel 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., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
23 *****************************************************************************/
25 /*****************************************************************************
27 *****************************************************************************/
29 #include <vlc/decoder.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_callbacks( DecoderOpen, Close );
46 set_description( _("DVD subtitles packetizer") );
47 set_capability( "packetizer", 50 );
48 set_callbacks( PacketizerOpen, Close );
51 /*****************************************************************************
53 *****************************************************************************/
54 static block_t * Reassemble( decoder_t *, block_t ** );
55 static subpicture_t * Decode ( decoder_t *, block_t ** );
56 static block_t * Packetize ( decoder_t *, block_t ** );
58 /*****************************************************************************
60 *****************************************************************************
61 * Tries to launch a decoder and return score so that the interface is able
63 *****************************************************************************/
64 static int DecoderOpen( vlc_object_t *p_this )
66 decoder_t *p_dec = (decoder_t*)p_this;
69 if( p_dec->fmt_in.i_codec != VLC_FOURCC( 's','p','u',' ' ) &&
70 p_dec->fmt_in.i_codec != VLC_FOURCC( 's','p','u','b' ) )
75 p_dec->p_sys = p_sys = malloc( sizeof( decoder_sys_t ) );
77 p_sys->b_packetizer = VLC_FALSE;
78 p_sys->i_spu_size = 0;
80 p_sys->p_block = NULL;
82 es_format_Init( &p_dec->fmt_out, SPU_ES, VLC_FOURCC( 's','p','u',' ' ) );
84 p_dec->pf_decode_sub = Decode;
85 p_dec->pf_packetize = NULL;
90 /*****************************************************************************
92 *****************************************************************************
93 * Tries to launch a decoder and return score so that the interface is able
95 *****************************************************************************/
96 static int PacketizerOpen( vlc_object_t *p_this )
98 decoder_t *p_dec = (decoder_t*)p_this;
100 if( DecoderOpen( p_this ) )
104 p_dec->pf_packetize = Packetize;
105 p_dec->p_sys->b_packetizer = VLC_TRUE;
106 es_format_Copy( &p_dec->fmt_out, &p_dec->fmt_in );
107 p_dec->fmt_out.i_codec = VLC_FOURCC( 's','p','u',' ' );
112 /*****************************************************************************
114 *****************************************************************************/
115 static void Close( vlc_object_t *p_this )
117 decoder_t *p_dec = (decoder_t*)p_this;
118 decoder_sys_t *p_sys = p_dec->p_sys;
120 if( p_sys->p_block ) block_ChainRelease( p_sys->p_block );
124 /*****************************************************************************
126 *****************************************************************************/
127 static subpicture_t *Decode( decoder_t *p_dec, block_t **pp_block )
129 decoder_sys_t *p_sys = p_dec->p_sys;
130 block_t *p_spu_block;
132 if( (p_spu_block = Reassemble( p_dec, pp_block )) )
136 p_sys->i_spu = block_ChainExtract( p_spu_block, p_sys->buffer, 65536 );
137 p_sys->i_pts = p_spu_block->i_pts;
138 block_ChainRelease( p_spu_block );
140 /* Parse and decode */
141 p_spu = E_(ParsePacket)( p_dec );
144 p_sys->i_spu_size = 0;
145 p_sys->i_rle_size = 0;
147 p_sys->p_block = NULL;
155 /*****************************************************************************
157 *****************************************************************************/
158 static block_t *Packetize( decoder_t *p_dec, block_t **pp_block )
160 decoder_sys_t *p_sys = p_dec->p_sys;
161 block_t *p_spu = Reassemble( p_dec, pp_block );
165 p_spu->i_dts = p_spu->i_pts;
169 p_sys->i_spu_size = 0;
170 p_sys->i_rle_size = 0;
172 p_sys->p_block = NULL;
174 return block_ChainGather( p_spu );
180 /*****************************************************************************
182 *****************************************************************************/
183 static block_t *Reassemble( decoder_t *p_dec, block_t **pp_block )
185 decoder_sys_t *p_sys = p_dec->p_sys;
188 if( pp_block == NULL || *pp_block == NULL ) return NULL;
192 if( p_sys->i_spu_size <= 0 &&
193 ( p_block->i_pts <= 0 || p_block->i_buffer < 4 ) )
195 msg_Dbg( p_dec, "invalid starting packet (size < 4 or pts <=0)" );
196 msg_Dbg( p_dec, "spu size: %d, i_pts: "I64Fd" i_buffer: %d",
197 p_sys->i_spu_size, p_block->i_pts, p_block->i_buffer );
198 block_Release( p_block );
202 block_ChainAppend( &p_sys->p_block, p_block );
203 p_sys->i_spu += p_block->i_buffer;
205 if( p_sys->i_spu_size <= 0 )
207 p_sys->i_spu_size = ( p_block->p_buffer[0] << 8 )|
208 p_block->p_buffer[1];
209 p_sys->i_rle_size = ( ( p_block->p_buffer[2] << 8 )|
210 p_block->p_buffer[3] ) - 4;
212 /* msg_Dbg( p_dec, "i_spu_size=%d i_rle=%d",
213 p_sys->i_spu_size, p_sys->i_rle_size ); */
215 if( p_sys->i_spu_size <= 0 || p_sys->i_rle_size >= p_sys->i_spu_size )
217 p_sys->i_spu_size = 0;
218 p_sys->i_rle_size = 0;
220 p_sys->p_block = NULL;
222 block_Release( p_block );
227 if( p_sys->i_spu >= p_sys->i_spu_size )
229 /* We have a complete sub */
230 msg_Dbg( p_dec, "SPU packets size=%d should be %d",
231 p_sys->i_spu, p_sys->i_spu_size );
233 return p_sys->p_block;