spudec.c 7.71 KB
Newer Older
1
/*****************************************************************************
2
 * spudec.c : SPU decoder thread
3
 *****************************************************************************
4
 * Copyright (C) 2000-2001 the VideoLAN team
5
 * $Id$
6 7
 *
 * Authors: Samuel Hocevar <sam@zoy.org>
Laurent Aimar's avatar
Laurent Aimar committed
8
 *          Laurent Aimar <fenrir@via.ecp.fr>
9 10 11 12 13
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
Laurent Aimar's avatar
Laurent Aimar committed
14
 *
15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
 *****************************************************************************/

/*****************************************************************************
 * Preamble
 *****************************************************************************/
#include <vlc/vlc.h>
#include <vlc/decoder.h>

#include "spudec.h"

/*****************************************************************************
 * Module descriptor.
 *****************************************************************************/
Laurent Aimar's avatar
Laurent Aimar committed
36 37
static int  DecoderOpen   ( vlc_object_t * );
static int  PacketizerOpen( vlc_object_t * );
38
static void Close         ( vlc_object_t * );
Laurent Aimar's avatar
Laurent Aimar committed
39

40
vlc_module_begin();
Derk-Jan Hartman's avatar
* ALL:  
Derk-Jan Hartman committed
41
    set_description( _("DVD subtitles decoder") );
42
    set_capability( "decoder", 50 );
Clément Stenac's avatar
Clément Stenac committed
43 44
    set_category( CAT_INPUT );
    set_subcategory( SUBCAT_INPUT_SCODEC );
Laurent Aimar's avatar
Laurent Aimar committed
45 46 47 48
    set_callbacks( DecoderOpen, Close );

    add_submodule();
    set_description( _("DVD subtitles packetizer") );
49
    set_capability( "packetizer", 50 );
Laurent Aimar's avatar
Laurent Aimar committed
50
    set_callbacks( PacketizerOpen, Close );
51 52 53
vlc_module_end();

/*****************************************************************************
Laurent Aimar's avatar
Laurent Aimar committed
54 55
 * Local prototypes
 *****************************************************************************/
56 57 58
static block_t *      Reassemble( decoder_t *, block_t ** );
static subpicture_t * Decode    ( decoder_t *, block_t ** );
static block_t *      Packetize ( decoder_t *, block_t ** );
Laurent Aimar's avatar
Laurent Aimar committed
59 60 61

/*****************************************************************************
 * DecoderOpen
62
 *****************************************************************************
Laurent Aimar's avatar
Laurent Aimar committed
63
 * Tries to launch a decoder and return score so that the interface is able
64 65
 * to chose.
 *****************************************************************************/
Laurent Aimar's avatar
Laurent Aimar committed
66
static int DecoderOpen( vlc_object_t *p_this )
67
{
Laurent Aimar's avatar
Laurent Aimar committed
68 69
    decoder_t     *p_dec = (decoder_t*)p_this;
    decoder_sys_t *p_sys;
70

Laurent Aimar's avatar
Laurent Aimar committed
71 72
    if( p_dec->fmt_in.i_codec != VLC_FOURCC( 's','p','u',' ' ) &&
        p_dec->fmt_in.i_codec != VLC_FOURCC( 's','p','u','b' ) )
73
    {
74
        return VLC_EGENERIC;
75
    }
76

Laurent Aimar's avatar
Laurent Aimar committed
77 78 79 80 81 82 83 84 85 86
    p_dec->p_sys = p_sys = malloc( sizeof( decoder_sys_t ) );

    p_sys->b_packetizer = VLC_FALSE;
    p_sys->i_spu_size = 0;
    p_sys->i_spu      = 0;
    p_sys->p_block    = NULL;

    es_format_Init( &p_dec->fmt_out, SPU_ES, VLC_FOURCC( 's','p','u',' ' ) );

    p_dec->pf_decode_sub = Decode;
87
    p_dec->pf_packetize  = NULL;
88 89

    return VLC_SUCCESS;
90 91 92
}

/*****************************************************************************
Laurent Aimar's avatar
Laurent Aimar committed
93 94 95 96
 * PacketizerOpen
 *****************************************************************************
 * Tries to launch a decoder and return score so that the interface is able
 * to chose.
97
 *****************************************************************************/
Laurent Aimar's avatar
Laurent Aimar committed
98
static int PacketizerOpen( vlc_object_t *p_this )
99
{
Laurent Aimar's avatar
Laurent Aimar committed
100
    decoder_t *p_dec = (decoder_t*)p_this;
101

Laurent Aimar's avatar
Laurent Aimar committed
102
    if( DecoderOpen( p_this ) )
103
    {
Laurent Aimar's avatar
Laurent Aimar committed
104
        return VLC_EGENERIC;
105
    }
106
    p_dec->pf_packetize  = Packetize;
Laurent Aimar's avatar
Laurent Aimar committed
107
    p_dec->p_sys->b_packetizer = VLC_TRUE;
108 109
    es_format_Copy( &p_dec->fmt_out, &p_dec->fmt_in );
    p_dec->fmt_out.i_codec = VLC_FOURCC( 's','p','u',' ' );
Laurent Aimar's avatar
Laurent Aimar committed
110 111 112 113 114 115 116 117 118 119 120

    return VLC_SUCCESS;
}

/*****************************************************************************
 * Close:
 *****************************************************************************/
static void Close( vlc_object_t *p_this )
{
    decoder_t     *p_dec = (decoder_t*)p_this;
    decoder_sys_t *p_sys = p_dec->p_sys;
121

122
    if( p_sys->p_block ) block_ChainRelease( p_sys->p_block );
Laurent Aimar's avatar
Laurent Aimar committed
123 124
    free( p_sys );
}
Gildas Bazin's avatar
 
Gildas Bazin committed
125

Laurent Aimar's avatar
Laurent Aimar committed
126 127 128
/*****************************************************************************
 * Decode:
 *****************************************************************************/
129
static subpicture_t *Decode( decoder_t *p_dec, block_t **pp_block )
Laurent Aimar's avatar
Laurent Aimar committed
130 131
{
    decoder_sys_t *p_sys = p_dec->p_sys;
132
    block_t       *p_spu_block;
Laurent Aimar's avatar
Laurent Aimar committed
133

134
    if( (p_spu_block = Reassemble( p_dec, pp_block )) )
Laurent Aimar's avatar
Laurent Aimar committed
135
    {
136
        subpicture_t *p_spu;
Laurent Aimar's avatar
Laurent Aimar committed
137

138 139 140
        p_sys->i_spu = block_ChainExtract( p_spu_block, p_sys->buffer, 65536 );
        p_sys->i_pts = p_spu_block->i_pts;
        block_ChainRelease( p_spu_block );
141

142 143
        /* Parse and decode */
        p_spu = E_(ParsePacket)( p_dec );
Laurent Aimar's avatar
Laurent Aimar committed
144 145 146 147 148 149

        /* reinit context */
        p_sys->i_spu_size = 0;
        p_sys->i_rle_size = 0;
        p_sys->i_spu      = 0;
        p_sys->p_block    = NULL;
150 151

        return p_spu;
152
    }
153 154

    return NULL;
Laurent Aimar's avatar
Laurent Aimar committed
155 156 157 158 159 160 161 162 163
}

/*****************************************************************************
 * Packetize:
 *****************************************************************************/
static block_t *Packetize( decoder_t *p_dec, block_t **pp_block )
{
    decoder_sys_t *p_sys = p_dec->p_sys;
    block_t       *p_spu = Reassemble( p_dec, pp_block );
164

Laurent Aimar's avatar
Laurent Aimar committed
165
    if( p_spu )
166
    {
167 168 169
        p_spu->i_dts = p_spu->i_pts;
        p_spu->i_length = 0;

Laurent Aimar's avatar
Laurent Aimar committed
170 171 172 173 174
        /* reinit context */
        p_sys->i_spu_size = 0;
        p_sys->i_rle_size = 0;
        p_sys->i_spu      = 0;
        p_sys->p_block    = NULL;
175

Laurent Aimar's avatar
Laurent Aimar committed
176
        return block_ChainGather( p_spu );
177
    }
178

Laurent Aimar's avatar
Laurent Aimar committed
179
    return NULL;
180 181 182
}

/*****************************************************************************
Laurent Aimar's avatar
Laurent Aimar committed
183
 * Reassemble:
184
 *****************************************************************************/
Laurent Aimar's avatar
Laurent Aimar committed
185
static block_t *Reassemble( decoder_t *p_dec, block_t **pp_block )
186
{
Laurent Aimar's avatar
Laurent Aimar committed
187 188 189
    decoder_sys_t *p_sys = p_dec->p_sys;
    block_t *p_block;

190
    if( pp_block == NULL || *pp_block == NULL ) return NULL;
Laurent Aimar's avatar
Laurent Aimar committed
191 192 193
    p_block = *pp_block;
    *pp_block = NULL;

194 195
    if( p_sys->i_spu_size <= 0 &&
        ( p_block->i_pts <= 0 || p_block->i_buffer < 4 ) )
Gildas Bazin's avatar
 
Gildas Bazin committed
196
    {
Laurent Aimar's avatar
Laurent Aimar committed
197
        msg_Dbg( p_dec, "invalid starting packet (size < 4 or pts <=0)" );
198 199
        msg_Dbg( p_dec, "spu size: %d, i_pts: "I64Fd" i_buffer: %d",
                 p_sys->i_spu_size, p_block->i_pts, p_block->i_buffer );
Laurent Aimar's avatar
Laurent Aimar committed
200 201
        block_Release( p_block );
        return NULL;
Gildas Bazin's avatar
 
Gildas Bazin committed
202
    }
Laurent Aimar's avatar
Laurent Aimar committed
203 204 205 206 207 208

    block_ChainAppend( &p_sys->p_block, p_block );
    p_sys->i_spu += p_block->i_buffer;

    if( p_sys->i_spu_size <= 0 )
    {
209 210 211 212
        p_sys->i_spu_size = ( p_block->p_buffer[0] << 8 )|
            p_block->p_buffer[1];
        p_sys->i_rle_size = ( ( p_block->p_buffer[2] << 8 )|
            p_block->p_buffer[3] ) - 4;
Laurent Aimar's avatar
Laurent Aimar committed
213

214 215
        /* msg_Dbg( p_dec, "i_spu_size=%d i_rle=%d",
                    p_sys->i_spu_size, p_sys->i_rle_size ); */
216

Laurent Aimar's avatar
Laurent Aimar committed
217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233
        if( p_sys->i_spu_size <= 0 || p_sys->i_rle_size >= p_sys->i_spu_size )
        {
            p_sys->i_spu_size = 0;
            p_sys->i_rle_size = 0;
            p_sys->i_spu      = 0;
            p_sys->p_block    = NULL;

            block_Release( p_block );
            return NULL;
        }
    }

    if( p_sys->i_spu >= p_sys->i_spu_size )
    {
        /* We have a complete sub */
        msg_Dbg( p_dec, "SPU packets size=%d should be %d",
                 p_sys->i_spu, p_sys->i_spu_size );
234 235

        return p_sys->p_block;
Laurent Aimar's avatar
Laurent Aimar committed
236 237
    }
    return NULL;
Gildas Bazin's avatar
 
Gildas Bazin committed
238
}