include/vlc_codec.h

   1 /*****************************************************************************
   2  * vlc_codec.h: Definition of the decoder and encoder structures
   3  *****************************************************************************
   4  * Copyright (C) 1999-2003 VLC authors and VideoLAN
   5  * $Id$
   6  *
   7  * Authors: Gildas Bazin <gbazin@netcourrier.com>
   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 #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
 109     /* SPU output callbacks
 110      * XXX use decoder_NewSubpicture and decoder_DeleteSubpicture */
 111     subpicture_t   *(*pf_spu_buffer_new)( decoder_t *, const subpicture_updater_t * );
 112     void            (*pf_spu_buffer_del)( decoder_t *, subpicture_t * );
 113
 114     /* Input attachments
 115      * XXX use decoder_GetInputAttachments */
 116     int             (*pf_get_attachments)( decoder_t *p_dec, input_attachment_t ***ppp_attachment, int *pi_attachment );
 117
 118     /* Display date
 119      * XXX use decoder_GetDisplayDate */
 120     mtime_t         (*pf_get_display_date)( decoder_t *, mtime_t );
 121
 122     /* Display rate
 123      * XXX use decoder_GetDisplayRate */
 124     int             (*pf_get_display_rate)( decoder_t * );
 125
 126     /* Private structure for the owner of the decoder */
 127     decoder_owner_sys_t *p_owner;
 128
 129     bool                b_error;
 130 };
 131
 132 /**
 133  * @}
 134  */
 135
 136 /**
 137  * \defgroup encoder Encoder
 138  *
 139  * The structure describing a Encoder
 140  *
 141  * @{
 142  */
 143
 144 struct encoder_t
 145 {
 146     VLC_COMMON_MEMBERS
 147
 148     /* Module properties */
 149     module_t *          p_module;
 150     encoder_sys_t *     p_sys;
 151
 152     /* Properties of the input data fed to the encoder */
 153     es_format_t         fmt_in;
 154
 155     /* Properties of the output of the encoder */
 156     es_format_t         fmt_out;
 157
 158     block_t *           ( * pf_encode_video )( encoder_t *, picture_t * );
 159     block_t *           ( * pf_encode_audio )( encoder_t *, aout_buffer_t * );
 160     block_t *           ( * pf_encode_sub )( encoder_t *, subpicture_t * );
 161
 162     /* Common encoder options */
 163     int i_threads;               /* Number of threads to use during encoding */
 164     int i_iframes;               /* One I frame per i_iframes */
 165     int i_bframes;               /* One B frame per i_bframes */
 166     int i_tolerance;             /* Bitrate tolerance */
 167
 168     /* Encoder config */
 169     config_chain_t *p_cfg;
 170 };
 171
 172 /**
 173  * @}
 174  */
 175
 176
 177 /**
 178  * This function will return a new picture usable by a decoder as an output
 179  * buffer. You have to release it using decoder_DeletePicture or by returning
 180  * it to the caller as a pf_decode_video return value.
 181  */
 182 VLC_API picture_t * decoder_NewPicture( decoder_t * ) VLC_USED;
 183
 184 /**
 185  * This function will release a picture create by decoder_NewPicture.
 186  */
 187 VLC_API void decoder_DeletePicture( decoder_t *, picture_t *p_picture );
 188
 189 /**
 190  * This function will increase the picture reference count.
 191  * (picture_Hold is not usable.)
 192  */
 193 VLC_API void decoder_LinkPicture( decoder_t *, picture_t * );
 194
 195 /**
 196  * This function will decrease the picture reference count.
 197  * (picture_Release is not usable.)
 198  */
 199 VLC_API void decoder_UnlinkPicture( decoder_t *, picture_t * );
 200
 201 /**
 202  * This function will return a new audio buffer usable by a decoder as an
 203  * output buffer. You have to release it using decoder_DeleteAudioBuffer
 204  * or by returning it to the caller as a pf_decode_audio return value.
 205  */
 206 VLC_API aout_buffer_t * decoder_NewAudioBuffer( decoder_t *, int i_size ) VLC_USED;
 207
 208 /**
 209  * This function will return a new subpicture usable by a decoder as an output
 210  * buffer. You have to release it using decoder_DeleteSubpicture or by returning
 211  * it to the caller as a pf_decode_sub return value.
 212  */
 213 VLC_API subpicture_t * decoder_NewSubpicture( decoder_t *, const subpicture_updater_t * ) VLC_USED;
 214
 215 /**
 216  * This function will release a subpicture created by decoder_NewSubicture.
 217  */
 218 VLC_API void decoder_DeleteSubpicture( decoder_t *, subpicture_t *p_subpicture );
 219
 220 /**
 221  * This function gives all input attachments at once.
 222  *
 223  * You MUST release the returned values
 224  */
 225 VLC_API int decoder_GetInputAttachments( decoder_t *, input_attachment_t ***ppp_attachment, int *pi_attachment );
 226
 227 /**
 228  * This function converts a decoder timestamp into a display date comparable
 229  * to mdate().
 230  * You MUST use it *only* for gathering statistics about speed.
 231  */
 232 VLC_API mtime_t decoder_GetDisplayDate( decoder_t *, mtime_t ) VLC_USED;
 233
 234 /**
 235  * This function returns the current input rate.
 236  * You MUST use it *only* for gathering statistics about speed.
 237  */
 238 VLC_API int decoder_GetDisplayRate( decoder_t * ) VLC_USED;
 239
 240 #endif /* _VLC_CODEC_H */