source/modules/juce_audio_formats/codecs/oggvorbis/codec.h

   1 /********************************************************************
   2  *                                                                  *
   3  * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE.   *
   4  * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS     *
   5  * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
   6  * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING.       *
   7  *                                                                  *
   8  * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2001             *
   9  * by the Xiph.Org Foundation https://xiph.org/                     *
  10
  11  ********************************************************************
  12
  13  function: libvorbis codec headers
  14
  15  ********************************************************************/
  16
  17 #ifndef _vorbis_codec_h_
  18 #define _vorbis_codec_h_
  19
  20 #ifdef __cplusplus
  21 extern "C"
  22 {
  23 #endif /* __cplusplus */
  24
  25 #include "ogg.h"
  26
  27 typedef struct vorbis_info{
  28   int version;
  29   int channels;
  30   long rate;
  31
  32   /* The below bitrate declarations are *hints*.
  33      Combinations of the three values carry the following implications:
  34
  35      all three set to the same value:
  36        implies a fixed rate bitstream
  37      only nominal set:
  38        implies a VBR stream that averages the nominal bitrate.  No hard
  39        upper/lower limit
  40      upper and or lower set:
  41        implies a VBR bitstream that obeys the bitrate limits. nominal
  42        may also be set to give a nominal rate.
  43      none set:
  44        the coder does not care to speculate.
  45   */
  46
  47   long bitrate_upper;
  48   long bitrate_nominal;
  49   long bitrate_lower;
  50   long bitrate_window;
  51
  52   void *codec_setup;
  53 } vorbis_info;
  54
  55 /* vorbis_dsp_state buffers the current vorbis audio
  56    analysis/synthesis state.  The DSP state belongs to a specific
  57    logical bitstream ****************************************************/
  58 typedef struct vorbis_dsp_state{
  59   int analysisp;
  60   vorbis_info *vi;
  61
  62   float **pcm;
  63   float **pcmret;
  64   int      pcm_storage;
  65   int      pcm_current;
  66   int      pcm_returned;
  67
  68   int  preextrapolate;
  69   int  eofflag;
  70
  71   long lW;
  72   long W;
  73   long nW;
  74   long centerW;
  75
  76   ogg_int64_t granulepos;
  77   ogg_int64_t sequence;
  78
  79   ogg_int64_t glue_bits;
  80   ogg_int64_t time_bits;
  81   ogg_int64_t floor_bits;
  82   ogg_int64_t res_bits;
  83
  84   void       *backend_state;
  85 } vorbis_dsp_state;
  86
  87 typedef struct vorbis_block{
  88   /* necessary stream state for linking to the framing abstraction */
  89   float  **pcm;       /* this is a pointer into local storage */
  90   oggpack_buffer opb;
  91
  92   long  lW;
  93   long  W;
  94   long  nW;
  95   int   pcmend;
  96   int   mode;
  97
  98   int         eofflag;
  99   ogg_int64_t granulepos;
 100   ogg_int64_t sequence;
 101   vorbis_dsp_state *vd; /* For read-only access of configuration */
 102
 103   /* local storage to avoid remallocing; it's up to the mapping to
 104      structure it */
 105   void               *localstore;
 106   long                localtop;
 107   long                localalloc;
 108   long                totaluse;
 109   struct alloc_chain *reap;
 110
 111   /* bitmetrics for the frame */
 112   long glue_bits;
 113   long time_bits;
 114   long floor_bits;
 115   long res_bits;
 116
 117   void *internal;
 118
 119 } vorbis_block;
 120
 121 /* vorbis_block is a single block of data to be processed as part of
 122 the analysis/synthesis stream; it belongs to a specific logical
 123 bitstream, but is independent from other vorbis_blocks belonging to
 124 that logical bitstream. *************************************************/
 125
 126 struct alloc_chain{
 127   void *ptr;
 128   struct alloc_chain *next;
 129 };
 130
 131 /* vorbis_info contains all the setup information specific to the
 132    specific compression/decompression mode in progress (eg,
 133    psychoacoustic settings, channel setup, options, codebook
 134    etc). vorbis_info and substructures are in backends.h.
 135 *********************************************************************/
 136
 137 /* the comments are not part of vorbis_info so that vorbis_info can be
 138    static storage */
 139 typedef struct vorbis_comment{
 140   /* unlimited user comment fields.  libvorbis writes 'libvorbis'
 141      whatever vendor is set to in encode */
 142   char **user_comments;
 143   int   *comment_lengths;
 144   int    comments;
 145   char  *vendor;
 146
 147 } vorbis_comment;
 148
 149
 150 /* libvorbis encodes in two abstraction layers; first we perform DSP
 151    and produce a packet (see docs/analysis.txt).  The packet is then
 152    coded into a framed OggSquish bitstream by the second layer (see
 153    docs/framing.txt).  Decode is the reverse process; we sync/frame
 154    the bitstream and extract individual packets, then decode the
 155    packet back into PCM audio.
 156
 157    The extra framing/packetizing is used in streaming formats, such as
 158    files.  Over the net (such as with UDP), the framing and
 159    packetization aren't necessary as they're provided by the transport
 160    and the streaming layer is not used */
 161
 162 /* Vorbis PRIMITIVES: general ***************************************/
 163
 164 extern void     vorbis_info_init(vorbis_info *vi);
 165 extern void     vorbis_info_clear(vorbis_info *vi);
 166 extern int      vorbis_info_blocksize(vorbis_info *vi,int zo);
 167 extern void     vorbis_comment_init(vorbis_comment *vc);
 168 extern void     vorbis_comment_add(vorbis_comment *vc, const char *comment);
 169 extern void     vorbis_comment_add_tag(vorbis_comment *vc,
 170                                        const char *tag, const char *contents);
 171 extern char    *vorbis_comment_query(vorbis_comment *vc, const char *tag, int count);
 172 extern int      vorbis_comment_query_count(vorbis_comment *vc, const char *tag);
 173 extern void     vorbis_comment_clear(vorbis_comment *vc);
 174
 175 extern int      vorbis_block_init(vorbis_dsp_state *v, vorbis_block *vb);
 176 extern int      vorbis_block_clear(vorbis_block *vb);
 177 extern void     vorbis_dsp_clear(vorbis_dsp_state *v);
 178 extern double   vorbis_granule_time(vorbis_dsp_state *v,
 179                                     ogg_int64_t granulepos);
 180
 181 extern const char *vorbis_version_string(void);
 182
 183 /* Vorbis PRIMITIVES: analysis/DSP layer ****************************/
 184
 185 extern int      vorbis_analysis_init(vorbis_dsp_state *v,vorbis_info *vi);
 186 extern int      vorbis_commentheader_out(vorbis_comment *vc, ogg_packet *op);
 187 extern int      vorbis_analysis_headerout(vorbis_dsp_state *v,
 188                                           vorbis_comment *vc,
 189                                           ogg_packet *op,
 190                                           ogg_packet *op_comm,
 191                                           ogg_packet *op_code);
 192 extern float  **vorbis_analysis_buffer(vorbis_dsp_state *v,int vals);
 193 extern int      vorbis_analysis_wrote(vorbis_dsp_state *v,int vals);
 194 extern int      vorbis_analysis_blockout(vorbis_dsp_state *v,vorbis_block *vb);
 195 extern int      vorbis_analysis(vorbis_block *vb,ogg_packet *op);
 196
 197 extern int      vorbis_bitrate_addblock(vorbis_block *vb);
 198 extern int      vorbis_bitrate_flushpacket(vorbis_dsp_state *vd,
 199                                            ogg_packet *op);
 200
 201 /* Vorbis PRIMITIVES: synthesis layer *******************************/
 202 extern int      vorbis_synthesis_idheader(ogg_packet *op);
 203 extern int      vorbis_synthesis_headerin(vorbis_info *vi,vorbis_comment *vc,
 204                                           ogg_packet *op);
 205
 206 extern int      vorbis_synthesis_init(vorbis_dsp_state *v,vorbis_info *vi);
 207 extern int      vorbis_synthesis_restart(vorbis_dsp_state *v);
 208 extern int      vorbis_synthesis(vorbis_block *vb,ogg_packet *op);
 209 extern int      vorbis_synthesis_trackonly(vorbis_block *vb,ogg_packet *op);
 210 extern int      vorbis_synthesis_blockin(vorbis_dsp_state *v,vorbis_block *vb);
 211 extern int      vorbis_synthesis_pcmout(vorbis_dsp_state *v,float ***pcm);
 212 extern int      vorbis_synthesis_lapout(vorbis_dsp_state *v,float ***pcm);
 213 extern int      vorbis_synthesis_read(vorbis_dsp_state *v,int samples);
 214 extern long     vorbis_packet_blocksize(vorbis_info *vi,ogg_packet *op);
 215
 216 extern int      vorbis_synthesis_halfrate(vorbis_info *v,int flag);
 217 extern int      vorbis_synthesis_halfrate_p(vorbis_info *v);
 218
 219 /* Vorbis ERRORS and return codes ***********************************/
 220
 221 #define OV_FALSE      -1
 222 #define OV_EOF        -2
 223 #define OV_HOLE       -3
 224
 225 #define OV_EREAD      -128
 226 #define OV_EFAULT     -129
 227 #define OV_EIMPL      -130
 228 #define OV_EINVAL     -131
 229 #define OV_ENOTVORBIS -132
 230 #define OV_EBADHEADER -133
 231 #define OV_EVERSION   -134
 232 #define OV_ENOTAUDIO  -135
 233 #define OV_EBADPACKET -136
 234 #define OV_EBADLINK   -137
 235 #define OV_ENOSEEK    -138
 236
 237 #ifdef __cplusplus
 238 }
 239 #endif /* __cplusplus */
 240
 241 #endif