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_CODEC_SPU )
79 p_dec->p_sys = p_sys = malloc( sizeof( decoder_sys_t ) );
81 p_sys->b_packetizer = false;
82 p_sys->i_spu_size = 0;
84 p_sys->p_block = NULL;
86 es_format_Init( &p_dec->fmt_out, SPU_ES, VLC_CODEC_SPU );
88 p_dec->pf_decode_sub = Decode;
89 p_dec->pf_packetize = NULL;
94 /*****************************************************************************
96 *****************************************************************************
97 * Tries to launch a decoder and return score so that the interface is able
99 *****************************************************************************/
100 static int PacketizerOpen( vlc_object_t *p_this )
102 decoder_t *p_dec = (decoder_t*)p_this;
104 if( DecoderOpen( p_this ) )
108 p_dec->pf_packetize = Packetize;
109 p_dec->p_sys->b_packetizer = true;
110 es_format_Copy( &p_dec->fmt_out, &p_dec->fmt_in );
111 p_dec->fmt_out.i_codec = VLC_CODEC_SPU;
116 /*****************************************************************************
118 *****************************************************************************/
119 static void Close( vlc_object_t *p_this )
121 decoder_t *p_dec = (decoder_t*)p_this;
122 decoder_sys_t *p_sys = p_dec->p_sys;
126 block_ChainRelease( p_sys->p_block );
132 /*****************************************************************************
134 *****************************************************************************/
135 static subpicture_t *Decode( decoder_t *p_dec, block_t **pp_block )
137 decoder_sys_t *p_sys = p_dec->p_sys;
138 block_t *p_spu_block;
141 p_spu_block = Reassemble( p_dec, pp_block );
148 /* FIXME: what the, we shouldn’t need to allocate 64k of buffer --sam. */
149 p_sys->i_spu = block_ChainExtract( p_spu_block, p_sys->buffer, 65536 );
150 p_sys->i_pts = p_spu_block->i_pts;
151 block_ChainRelease( p_spu_block );
153 /* Parse and decode */
154 p_spu = ParsePacket( p_dec );
157 p_sys->i_spu_size = 0;
158 p_sys->i_rle_size = 0;
160 p_sys->p_block = NULL;
165 /*****************************************************************************
167 *****************************************************************************/
168 static block_t *Packetize( decoder_t *p_dec, block_t **pp_block )
170 decoder_sys_t *p_sys = p_dec->p_sys;
171 block_t *p_spu = Reassemble( p_dec, pp_block );
178 p_spu->i_dts = p_spu->i_pts;
182 p_sys->i_spu_size = 0;
183 p_sys->i_rle_size = 0;
185 p_sys->p_block = NULL;
187 return block_ChainGather( p_spu );
190 /*****************************************************************************
192 *****************************************************************************/
193 static block_t *Reassemble( decoder_t *p_dec, block_t **pp_block )
195 decoder_sys_t *p_sys = p_dec->p_sys;
198 if( pp_block == NULL || *pp_block == NULL ) return NULL;
202 if( p_sys->i_spu_size <= 0 &&
203 ( p_block->i_pts <= 0 || p_block->i_buffer < 4 ) )
205 msg_Dbg( p_dec, "invalid starting packet (size < 4 or pts <=0)" );
206 msg_Dbg( p_dec, "spu size: %d, i_pts: %"PRId64" i_buffer: %zu",
207 p_sys->i_spu_size, p_block->i_pts, p_block->i_buffer );
208 block_Release( p_block );
212 block_ChainAppend( &p_sys->p_block, p_block );
213 p_sys->i_spu += p_block->i_buffer;
215 if( p_sys->i_spu_size <= 0 )
217 p_sys->i_spu_size = ( p_block->p_buffer[0] << 8 )|
218 p_block->p_buffer[1];
219 p_sys->i_rle_size = ( ( p_block->p_buffer[2] << 8 )|
220 p_block->p_buffer[3] ) - 4;
222 /* msg_Dbg( p_dec, "i_spu_size=%d i_rle=%d",
223 p_sys->i_spu_size, p_sys->i_rle_size ); */
225 if( p_sys->i_spu_size <= 0 || p_sys->i_rle_size >= p_sys->i_spu_size )
227 p_sys->i_spu_size = 0;
228 p_sys->i_rle_size = 0;
230 p_sys->p_block = NULL;
232 block_Release( p_block );
237 if( p_sys->i_spu >= p_sys->i_spu_size )
239 /* We have a complete sub */
240 if( p_sys->i_spu > p_sys->i_spu_size )
241 msg_Dbg( p_dec, "SPU packets size=%d should be %d",
242 p_sys->i_spu, p_sys->i_spu_size );
244 return p_sys->p_block;