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     block_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     /**
 106      * Number of extra (ie in addition to the DPB) picture buffers
 107      * needed for decoding.
 108      */
 109     int             i_extra_picture_buffers;
 110
 111     /* Audio output callbacks */
 112     int             (*pf_aout_format_update)( decoder_t * );
 113
 114     /* SPU output callbacks
 115      * XXX use decoder_NewSubpicture and decoder_DeleteSubpicture */
 116     subpicture_t   *(*pf_spu_buffer_new)( decoder_t *, const subpicture_updater_t * );
 117     void            (*pf_spu_buffer_del)( decoder_t *, subpicture_t * );
 118
 119     /* Input attachments
 120      * XXX use decoder_GetInputAttachments */
 121     int             (*pf_get_attachments)( decoder_t *p_dec, input_attachment_t ***ppp_attachment, int *pi_attachment );
 122
 123     /* Display date
 124      * XXX use decoder_GetDisplayDate */
 125     mtime_t         (*pf_get_display_date)( decoder_t *, mtime_t );
 126
 127     /* Display rate
 128      * XXX use decoder_GetDisplayRate */
 129     int             (*pf_get_display_rate)( decoder_t * );
 130
 131     /* Private structure for the owner of the decoder */
 132     decoder_owner_sys_t *p_owner;
 133
 134     bool                b_error;
 135 };
 136
 137 /**
 138  * @}
 139  */
 140
 141 /**
 142  * \defgroup encoder Encoder
 143  *
 144  * The structure describing a Encoder
 145  *
 146  * @{
 147  */
 148
 149 struct encoder_t
 150 {
 151     VLC_COMMON_MEMBERS
 152
 153     /* Module properties */
 154     module_t *          p_module;
 155     encoder_sys_t *     p_sys;
 156
 157     /* Properties of the input data fed to the encoder */
 158     es_format_t         fmt_in;
 159
 160     /* Properties of the output of the encoder */
 161     es_format_t         fmt_out;
 162
 163     block_t *           ( * pf_encode_video )( encoder_t *, picture_t * );
 164     block_t *           ( * pf_encode_audio )( encoder_t *, block_t * );
 165     block_t *           ( * pf_encode_sub )( encoder_t *, subpicture_t * );
 166
 167     /* Common encoder options */
 168     int i_threads;               /* Number of threads to use during encoding */
 169     int i_iframes;               /* One I frame per i_iframes */
 170     int i_bframes;               /* One B frame per i_bframes */
 171     int i_tolerance;             /* Bitrate tolerance */
 172
 173     /* Encoder config */
 174     config_chain_t *p_cfg;
 175 };
 176
 177 /**
 178  * @}
 179  */
 180
 181
 182 /**
 183  * This function will return a new picture usable by a decoder as an output
 184  * buffer. You have to release it using decoder_DeletePicture or by returning
 185  * it to the caller as a pf_decode_video return value.
 186  */
 187 VLC_API picture_t * decoder_NewPicture( decoder_t * ) VLC_USED;
 188
 189 /**
 190  * This function will release a picture create by decoder_NewPicture.
 191  */
 192 VLC_API void decoder_DeletePicture( decoder_t *, picture_t *p_picture );
 193
 194 /**
 195  * This function will increase the picture reference count.
 196  * (picture_Hold is not usable.)
 197  */
 198 VLC_API void decoder_LinkPicture( decoder_t *, picture_t * );
 199
 200 /**
 201  * This function will decrease the picture reference count.
 202  * (picture_Release is not usable.)
 203  */
 204 VLC_API void decoder_UnlinkPicture( decoder_t *, picture_t * );
 205
 206 /**
 207  * This function notifies the audio output pipeline of a new audio output
 208  * format (fmt_out.audio). If there is currently no audio output or if the
 209  * audio output format has changed, a new audio output will be set up.
 210  * @return 0 if the audio output is working, -1 if not. */
 211 static inline int decoder_UpdateAudioFormat( decoder_t *dec )
 212 {
 213     if( dec->pf_aout_format_update != NULL )
 214         return dec->pf_aout_format_update( dec );
 215     else
 216         return -1;
 217 }
 218
 219 /**
 220  * This function will return a new audio buffer usable by a decoder as an
 221  * output buffer. You have to release it using decoder_DeleteAudioBuffer
 222  * or by returning it to the caller as a pf_decode_audio return value.
 223  */
 224 VLC_API block_t * decoder_NewAudioBuffer( decoder_t *, int i_size ) VLC_USED;
 225
 226 /**
 227  * This function will return a new subpicture usable by a decoder as an output
 228  * buffer. You have to release it using decoder_DeleteSubpicture or by returning
 229  * it to the caller as a pf_decode_sub return value.
 230  */
 231 VLC_API subpicture_t * decoder_NewSubpicture( decoder_t *, const subpicture_updater_t * ) VLC_USED;
 232
 233 /**
 234  * This function will release a subpicture created by decoder_NewSubicture.
 235  */
 236 VLC_API void decoder_DeleteSubpicture( decoder_t *, subpicture_t *p_subpicture );
 237
 238 /**
 239  * This function gives all input attachments at once.
 240  *
 241  * You MUST release the returned values
 242  */
 243 VLC_API int decoder_GetInputAttachments( decoder_t *, input_attachment_t ***ppp_attachment, int *pi_attachment );
 244
 245 /**
 246  * This function converts a decoder timestamp into a display date comparable
 247  * to mdate().
 248  * You MUST use it *only* for gathering statistics about speed.
 249  */
 250 VLC_API mtime_t decoder_GetDisplayDate( decoder_t *, mtime_t ) VLC_USED;
 251
 252 /**
 253  * This function returns the current input rate.
 254  * You MUST use it *only* for gathering statistics about speed.
 255  */
 256 VLC_API int decoder_GetDisplayRate( decoder_t * ) VLC_USED;
 257
 258 #endif /* _VLC_CODEC_H */