modules/packetizer/copy.c

   1 /*****************************************************************************
   2  * copy.c
   3  *****************************************************************************
   4  * Copyright (C) 2001, 2002, 2006 VLC authors and VideoLAN
   5  *
   6  * Authors: Laurent Aimar <fenrir@via.ecp.fr>
   7  *          Eric Petit <titer@videolan.org>
   8  *
   9  * This program is free software; you can redistribute it and/or modify it
  10  * under the terms of the GNU Lesser General Public License as published by
  11  * the Free Software Foundation; either version 2.1 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  17  * GNU Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public License
  20  * along with this program; if not, write to the Free Software Foundation,
  21  * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  22  *****************************************************************************/
  23
  24 /*****************************************************************************
  25  * Preamble
  26  *****************************************************************************/
  27
  28 #ifdef HAVE_CONFIG_H
  29 # include "config.h"
  30 #endif
  31
  32 #include <vlc_common.h>
  33 #include <vlc_plugin.h>
  34 #include <vlc_codec.h>
  35 #include <vlc_block.h>
  36 #include <vlc_bits.h>
  37
  38 /*****************************************************************************
  39  * Module descriptor
  40  *****************************************************************************/
  41 static int  Open ( vlc_object_t * );
  42 static void Close( vlc_object_t * );
  43
  44 vlc_module_begin ()
  45     set_category( CAT_SOUT )
  46     set_subcategory( SUBCAT_SOUT_PACKETIZER )
  47     set_description( N_("Copy packetizer") )
  48     set_capability( "packetizer", 1 )
  49     set_callbacks( Open, Close )
  50 vlc_module_end ()
  51
  52 /*****************************************************************************
  53  * Local prototypes
  54  *****************************************************************************/
  55 typedef struct
  56 {
  57     block_t *p_block;
  58     void (*pf_parse)( decoder_t *, block_t * );
  59 } decoder_sys_t;
  60
  61 static block_t *Packetize   ( decoder_t *, block_t ** );
  62 static block_t *PacketizeSub( decoder_t *, block_t ** );
  63 static void Flush( decoder_t * );
  64
  65 static void ParseWMV3( decoder_t *, block_t * );
  66
  67 /*****************************************************************************
  68  * Open: probe the packetizer and return score
  69  *****************************************************************************
  70  * Tries to launch a decoder and return score so that the interface is able
  71  * to choose.
  72  *****************************************************************************/
  73 static int Open( vlc_object_t *p_this )
  74 {
  75     decoder_t     *p_dec = (decoder_t*)p_this;
  76     decoder_sys_t *p_sys;
  77
  78     if( p_dec->fmt_in.i_cat != AUDIO_ES &&
  79         p_dec->fmt_in.i_cat != VIDEO_ES &&
  80         p_dec->fmt_in.i_cat != SPU_ES )
  81     {
  82         msg_Err( p_dec, "invalid ES type" );
  83         return VLC_EGENERIC;
  84     }
  85
  86     p_dec->p_sys = p_sys = malloc( sizeof(*p_sys) );
  87     if (unlikely(p_sys == NULL))
  88         return VLC_ENOMEM;
  89
  90     p_sys->p_block    = NULL;
  91     switch( p_dec->fmt_in.i_codec )
  92     {
  93     case VLC_CODEC_WMV3:
  94         p_sys->pf_parse = ParseWMV3;
  95         break;
  96     default:
  97         p_sys->pf_parse = NULL;
  98         break;
  99     }
 100
 101     vlc_fourcc_t fcc = p_dec->fmt_in.i_codec;
 102     /* Fix the value of the fourcc for audio */
 103     if( p_dec->fmt_in.i_cat == AUDIO_ES )
 104     {
 105         fcc = vlc_fourcc_GetCodecAudio( p_dec->fmt_in.i_codec,
 106                                                      p_dec->fmt_in.audio.i_bitspersample );
 107         if( !fcc )
 108         {
 109             msg_Err( p_dec, "unknown raw audio sample size" );
 110             free( p_sys );
 111             return VLC_EGENERIC;
 112         }
 113     }
 114
 115     /* Create the output format */
 116     es_format_Copy( &p_dec->fmt_out, &p_dec->fmt_in );
 117     p_dec->fmt_out.i_codec = fcc;
 118     if( p_dec->fmt_in.i_cat == SPU_ES )
 119         p_dec->pf_packetize = PacketizeSub;
 120     else
 121         p_dec->pf_packetize = Packetize;
 122     p_dec->pf_flush = Flush;
 123     p_dec->pf_get_cc = NULL;
 124
 125     return VLC_SUCCESS;
 126 }
 127
 128 /*****************************************************************************
 129  * Close:
 130  *****************************************************************************/
 131 static void Close( vlc_object_t *p_this )
 132 {
 133     decoder_t     *p_dec = (decoder_t*)p_this;
 134     decoder_sys_t *p_sys = p_dec->p_sys;
 135
 136     if( p_sys->p_block )
 137     {
 138         block_ChainRelease( p_sys->p_block );
 139     }
 140
 141     free( p_dec->p_sys );
 142 }
 143
 144 static void Flush( decoder_t *p_dec )
 145 {
 146     decoder_sys_t *p_sys = p_dec->p_sys;
 147     block_t *p_ret = p_sys->p_block;
 148     if ( p_ret )
 149     {
 150         block_Release( p_ret );
 151         p_sys->p_block = NULL;
 152     }
 153 }
 154
 155 /*****************************************************************************
 156  * Packetize: packetize an unit (here copy a complete block )
 157  *****************************************************************************/
 158 static block_t *Packetize ( decoder_t *p_dec, block_t **pp_block )
 159 {
 160     block_t *p_block;
 161     decoder_sys_t *p_sys = p_dec->p_sys;
 162     block_t *p_ret = p_sys->p_block;
 163
 164     if( pp_block == NULL || *pp_block == NULL )
 165         return NULL;
 166     if( (*pp_block)->i_flags&(BLOCK_FLAG_CORRUPTED) )
 167     {
 168         block_Release( *pp_block );
 169         return NULL;
 170     }
 171
 172     p_block = *pp_block;
 173     *pp_block = NULL;
 174
 175     if( p_block->i_dts == VLC_TICK_INVALID )
 176     {
 177         p_block->i_dts = p_block->i_pts;
 178     }
 179
 180     if( p_block->i_dts == VLC_TICK_INVALID )
 181     {
 182         msg_Dbg( p_dec, "need valid dts" );
 183         block_Release( p_block );
 184         return NULL;
 185     }
 186
 187     if( p_ret != NULL && p_block->i_pts > p_ret->i_pts )
 188     {
 189         if (p_dec->fmt_in.i_codec != VLC_CODEC_OPUS)
 190             p_ret->i_length = p_block->i_pts - p_ret->i_pts;
 191     }
 192     p_sys->p_block = p_block;
 193
 194     if( p_ret && p_sys->pf_parse )
 195         p_sys->pf_parse( p_dec, p_ret );
 196     return p_ret;
 197 }
 198
 199 /*****************************************************************************
 200  * PacketizeSub: packetize an unit (here copy a complete block )
 201  *****************************************************************************/
 202 static block_t *PacketizeSub( decoder_t *p_dec, block_t **pp_block )
 203 {
 204     block_t *p_block;
 205
 206     if( pp_block == NULL || *pp_block == NULL )
 207         return NULL;
 208     if( (*pp_block)->i_flags&(BLOCK_FLAG_CORRUPTED) )
 209     {
 210         block_Release( *pp_block );
 211         return NULL;
 212     }
 213
 214     p_block = *pp_block;
 215     *pp_block = NULL;
 216
 217     if( p_block->i_dts == VLC_TICK_INVALID )
 218     {
 219         p_block->i_dts = p_block->i_pts;
 220     }
 221
 222     if( p_block->i_dts == VLC_TICK_INVALID )
 223     {
 224         msg_Dbg( p_dec, "need valid dts" );
 225         block_Release( p_block );
 226         return NULL;
 227     }
 228
 229     return p_block;
 230 }
 231
 232 /* Parse WMV3 packet and extract frame type information */
 233 static void ParseWMV3( decoder_t *p_dec, block_t *p_block )
 234 {
 235     bs_t s;
 236
 237     /* Parse Sequence header */
 238     bs_init( &s, p_dec->fmt_in.p_extra, p_dec->fmt_in.i_extra );
 239     if( bs_read( &s, 2 ) == 3 )
 240         return;
 241     bs_skip( &s, 22 );
 242     const bool b_range_reduction = bs_read( &s, 1 );
 243     const bool b_has_frames = bs_read( &s, 3 ) > 0;
 244     bs_skip( &s, 2 );
 245     const bool b_frame_interpolation = bs_read( &s, 1 );
 246     if( bs_eof( &s ) )
 247         return;
 248
 249     /* Parse frame type */
 250     bs_init( &s, p_block->p_buffer, p_block->i_buffer );
 251     bs_skip( &s, b_frame_interpolation +
 252                  2 +
 253                  b_range_reduction );
 254
 255     p_block->i_flags &= ~BLOCK_FLAG_TYPE_MASK;
 256     if( bs_read( &s, 1 ) )
 257         p_block->i_flags |= BLOCK_FLAG_TYPE_P;
 258     else if( !b_has_frames || bs_read( &s, 1 ) )
 259         p_block->i_flags |= BLOCK_FLAG_TYPE_I;
 260     else
 261         p_block->i_flags |= BLOCK_FLAG_TYPE_B;
 262 }
 263