include/vlc_codec.h

   1 /*****************************************************************************
   2  * vlc_codec.h: Definition of the decoder and encoder structures
   3  *****************************************************************************
   4  * Copyright (C) 1999-2003 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Gildas Bazin <gbazin@netcourrier.com>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 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 General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  22  *****************************************************************************/
  23
  24 #ifndef VLC_CODEC_H
  25 #define VLC_CODEC_H 1
  26
  27 #include <vlc_block.h>
  28 #include <vlc_es.h>
  29 #include <vlc_picture.h>
  30 #include <vlc_subpicture.h>
  31
  32 /**
  33  * \file
  34  * This file defines the structure and types used by decoders and encoders
  35  */
  36
  37 typedef struct decoder_owner_sys_t decoder_owner_sys_t;
  38
  39 /**
  40  * \defgroup decoder Decoder
  41  *
  42  * The structure describing a decoder
  43  *
  44  * @{
  45  */
  46
  47 /*
  48  * BIG FAT WARNING : the code relies in the first 4 members of filter_t
  49  * and decoder_t to be the same, so if you have anything to add, do it
  50  * at the end of the structure.
  51  */
  52 struct decoder_t
  53 {
  54     VLC_COMMON_MEMBERS
  55
  56     /* Module properties */
  57     module_t *          p_module;
  58     decoder_sys_t *     p_sys;
  59
  60     /* Input format ie from demuxer (XXX: a lot of field could be invalid) */
  61     es_format_t         fmt_in;
  62
  63     /* Output format of decoder/packetizer */
  64     es_format_t         fmt_out;
  65
  66     /* Some decoders only accept packetized data (ie. not truncated) */
  67     bool                b_need_packetized;
  68
  69     /* Tell the decoder if it is allowed to drop frames */
  70     bool                b_pace_control;
  71
  72     /* */
  73     picture_t *         ( * pf_decode_video )( decoder_t *, block_t ** );
  74     aout_buffer_t *     ( * pf_decode_audio )( decoder_t *, block_t ** );
  75     subpicture_t *      ( * pf_decode_sub)   ( decoder_t *, block_t ** );
  76     block_t *           ( * pf_packetize )   ( decoder_t *, block_t ** );
  77
  78     /* Closed Caption (CEA 608/708) extraction.
  79      * If set, it *may* be called after pf_decode_video/pf_packetize
  80      * returned data. It should return CC for the pictures returned by the
  81      * last pf_packetize/pf_decode_video call only,
  82      * pb_present will be used to known which cc channel are present (but
  83      * globaly, not necessary for the current packet */
  84     block_t *           ( * pf_get_cc )      ( decoder_t *, bool pb_present[4] );
  85
  86     /* Meta data at codec level
  87      *  The decoder owner set it back to NULL once it has retreived what it needs.
  88      *  The decoder owner is responsible of its release except when you overwrite it.
  89      */
  90     vlc_meta_t          *p_description;
  91
  92     /*
  93      * Owner fields
  94      * XXX You MUST not use them directly.
  95      */
  96
  97     /* Video output callbacks
  98      * XXX use decoder_NewPicture/decoder_DeletePicture
  99      * and decoder_LinkPicture/decoder_UnlinkPicture */
 100     picture_t      *(*pf_vout_buffer_new)( decoder_t * );
 101     void            (*pf_vout_buffer_del)( decoder_t *, picture_t * );
 102     void            (*pf_picture_link)   ( decoder_t *, picture_t * );
 103     void            (*pf_picture_unlink) ( decoder_t *, picture_t * );
 104
 105     /* Audio output callbacks
 106      * XXX use decoder_NewAudioBuffer/decoder_DeleteAudioBuffer */
 107     aout_buffer_t  *(*pf_aout_buffer_new)( decoder_t *, int );
 108     void            (*pf_aout_buffer_del)( decoder_t *, aout_buffer_t * );
 109
 110     /* SPU output callbacks
 111      * XXX use decoder_NewSubpicture and decoder_DeleteSubpicture */
 112     subpicture_t   *(*pf_spu_buffer_new)( decoder_t *, const subpicture_updater_t * );
 113     void            (*pf_spu_buffer_del)( decoder_t *, subpicture_t * );
 114
 115     /* Input attachments
 116      * XXX use decoder_GetInputAttachments */
 117     int             (*pf_get_attachments)( decoder_t *p_dec, input_attachment_t ***ppp_attachment, int *pi_attachment );
 118
 119     /* Display date
 120      * XXX use decoder_GetDisplayDate */
 121     mtime_t         (*pf_get_display_date)( decoder_t *, mtime_t );
 122
 123     /* Display rate
 124      * XXX use decoder_GetDisplayRate */
 125     int             (*pf_get_display_rate)( decoder_t * );
 126
 127     /* Private structure for the owner of the decoder */
 128     decoder_owner_sys_t *p_owner;
 129
 130     bool                b_error;
 131 };
 132
 133 /**
 134  * @}
 135  */
 136
 137 /**
 138  * \defgroup encoder Encoder
 139  *
 140  * The structure describing a Encoder
 141  *
 142  * @{
 143  */
 144
 145 struct encoder_t
 146 {
 147     VLC_COMMON_MEMBERS
 148
 149     /* Module properties */
 150     module_t *          p_module;
 151     encoder_sys_t *     p_sys;
 152
 153     /* Properties of the input data fed to the encoder */
 154     es_format_t         fmt_in;
 155
 156     /* Properties of the output of the encoder */
 157     es_format_t         fmt_out;
 158
 159     block_t *           ( * pf_encode_video )( encoder_t *, picture_t * );
 160     block_t *           ( * pf_encode_audio )( encoder_t *, aout_buffer_t * );
 161     block_t *           ( * pf_encode_sub )( encoder_t *, subpicture_t * );
 162
 163     /* Common encoder options */
 164     int i_threads;               /* Number of threads to use during encoding */
 165     int i_iframes;               /* One I frame per i_iframes */
 166     int i_bframes;               /* One B frame per i_bframes */
 167     int i_tolerance;             /* Bitrate tolerance */
 168
 169     /* Encoder config */
 170     config_chain_t *p_cfg;
 171 };
 172
 173 /**
 174  * @}
 175  */
 176
 177
 178 /**
 179  * This function will return a new picture usable by a decoder as an output
 180  * buffer. You have to release it using decoder_DeletePicture or by returning
 181  * it to the caller as a pf_decode_video return value.
 182  */
 183 VLC_EXPORT( picture_t *, decoder_NewPicture, ( decoder_t * ) LIBVLC_USED );
 184
 185 /**
 186  * This function will release a picture create by decoder_NewPicture.
 187  */
 188 VLC_EXPORT( void, decoder_DeletePicture, ( decoder_t *, picture_t *p_picture ) );
 189
 190 /**
 191  * This function will increase the picture reference count.
 192  * (picture_Hold is not usable.)
 193  */
 194 VLC_EXPORT( void, decoder_LinkPicture, ( decoder_t *, picture_t * ) );
 195
 196 /**
 197  * This function will decrease the picture reference count.
 198  * (picture_Release is not usable.)
 199  */
 200 VLC_EXPORT( void, decoder_UnlinkPicture, ( decoder_t *, picture_t * ) );
 201
 202 /**
 203  * This function will return a new audio buffer usable by a decoder as an
 204  * output buffer. You have to release it using decoder_DeleteAudioBuffer
 205  * or by returning it to the caller as a pf_decode_audio return value.
 206  */
 207 VLC_EXPORT( aout_buffer_t *, decoder_NewAudioBuffer, ( decoder_t *, int i_size ) LIBVLC_USED );
 208
 209 /**
 210  * This function will release a audio buffer created by decoder_NewAudioBuffer.
 211  */
 212 VLC_EXPORT( void, decoder_DeleteAudioBuffer, ( decoder_t *, aout_buffer_t *p_buffer ) );
 213
 214 /**
 215  * This function will return a new subpicture usable by a decoder as an output
 216  * buffer. You have to release it using decoder_DeleteSubpicture or by returning
 217  * it to the caller as a pf_decode_sub return value.
 218  */
 219 VLC_EXPORT( subpicture_t *, decoder_NewSubpicture, ( decoder_t *, const subpicture_updater_t * ) LIBVLC_USED );
 220
 221 /**
 222  * This function will release a subpicture created by decoder_NewSubicture.
 223  */
 224 VLC_EXPORT( void, decoder_DeleteSubpicture, ( decoder_t *, subpicture_t *p_subpicture ) );
 225
 226 /**
 227  * This function gives all input attachments at once.
 228  *
 229  * You MUST release the returned values
 230  */
 231 VLC_EXPORT( int, decoder_GetInputAttachments, ( decoder_t *, input_attachment_t ***ppp_attachment, int *pi_attachment ) );
 232
 233 /**
 234  * This function converts a decoder timestamp into a display date comparable
 235  * to mdate().
 236  * You MUST use it *only* for gathering statistics about speed.
 237  */
 238 VLC_EXPORT( mtime_t, decoder_GetDisplayDate, ( decoder_t *, mtime_t ) LIBVLC_USED );
 239
 240 /**
 241  * This function returns the current input rate.
 242  * You MUST use it *only* for gathering statistics about speed.
 243  */
 244 VLC_EXPORT( int, decoder_GetDisplayRate, ( decoder_t * ) LIBVLC_USED );
 245
 246 #endif /* _VLC_CODEC_H */