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234 lines
7.8 KiB
C
234 lines
7.8 KiB
C
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/********************************************************************
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* *
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* THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE. *
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* USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
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* GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
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* IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
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* *
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* THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2001 *
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* by the XIPHOPHORUS Company http://www.xiph.org/ *
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********************************************************************
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function: libvorbis codec headers
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last mod: $Id: codec.h,v 1.40 2002/02/28 04:12:47 xiphmont Exp $
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********************************************************************/
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#ifndef _vorbis_codec_h_
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#define _vorbis_codec_h_
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#ifdef __cplusplus
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extern "C"
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{
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#endif /* __cplusplus */
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#include <ogg/ogg.h>
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typedef struct vorbis_info{
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int version;
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int channels;
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long rate;
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/* The below bitrate declarations are *hints*.
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Combinations of the three values carry the following implications:
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all three set to the same value:
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implies a fixed rate bitstream
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only nominal set:
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implies a VBR stream that averages the nominal bitrate. No hard
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upper/lower limit
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upper and or lower set:
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implies a VBR bitstream that obeys the bitrate limits. nominal
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may also be set to give a nominal rate.
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none set:
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the coder does not care to speculate.
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*/
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long bitrate_upper;
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long bitrate_nominal;
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long bitrate_lower;
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long bitrate_window;
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void *codec_setup;
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} vorbis_info;
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/* vorbis_dsp_state buffers the current vorbis audio
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analysis/synthesis state. The DSP state belongs to a specific
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logical bitstream ****************************************************/
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typedef struct vorbis_dsp_state{
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int analysisp;
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vorbis_info *vi;
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float **pcm;
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float **pcmret;
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int pcm_storage;
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int pcm_current;
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int pcm_returned;
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int preextrapolate;
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int eofflag;
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long lW;
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long W;
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long nW;
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long centerW;
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ogg_int64_t granulepos;
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ogg_int64_t sequence;
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ogg_int64_t glue_bits;
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ogg_int64_t time_bits;
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ogg_int64_t floor_bits;
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ogg_int64_t res_bits;
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void *backend_state;
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} vorbis_dsp_state;
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typedef struct vorbis_block{
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/* necessary stream state for linking to the framing abstraction */
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float **pcm; /* this is a pointer into local storage */
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oggpack_buffer opb;
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long lW;
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long W;
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long nW;
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int pcmend;
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int mode;
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int eofflag;
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ogg_int64_t granulepos;
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ogg_int64_t sequence;
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vorbis_dsp_state *vd; /* For read-only access of configuration */
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/* local storage to avoid remallocing; it's up to the mapping to
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structure it */
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void *localstore;
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long localtop;
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long localalloc;
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long totaluse;
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struct alloc_chain *reap;
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/* bitmetrics for the frame */
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long glue_bits;
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long time_bits;
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long floor_bits;
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long res_bits;
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void *internal;
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} vorbis_block;
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/* vorbis_block is a single block of data to be processed as part of
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the analysis/synthesis stream; it belongs to a specific logical
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bitstream, but is independant from other vorbis_blocks belonging to
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that logical bitstream. *************************************************/
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struct alloc_chain{
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void *ptr;
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struct alloc_chain *next;
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};
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/* vorbis_info contains all the setup information specific to the
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specific compression/decompression mode in progress (eg,
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psychoacoustic settings, channel setup, options, codebook
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etc). vorbis_info and substructures are in backends.h.
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*********************************************************************/
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/* the comments are not part of vorbis_info so that vorbis_info can be
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static storage */
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typedef struct vorbis_comment{
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/* unlimited user comment fields. libvorbis writes 'libvorbis'
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whatever vendor is set to in encode */
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char **user_comments;
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int *comment_lengths;
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int comments;
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char *vendor;
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} vorbis_comment;
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/* libvorbis encodes in two abstraction layers; first we perform DSP
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and produce a packet (see docs/analysis.txt). The packet is then
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coded into a framed OggSquish bitstream by the second layer (see
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docs/framing.txt). Decode is the reverse process; we sync/frame
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the bitstream and extract individual packets, then decode the
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packet back into PCM audio.
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The extra framing/packetizing is used in streaming formats, such as
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files. Over the net (such as with UDP), the framing and
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packetization aren't necessary as they're provided by the transport
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and the streaming layer is not used */
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/* Vorbis PRIMITIVES: general ***************************************/
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extern void vorbis_info_init(vorbis_info *vi);
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extern void vorbis_info_clear(vorbis_info *vi);
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extern int vorbis_info_blocksize(vorbis_info *vi,int zo);
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extern void vorbis_comment_init(vorbis_comment *vc);
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extern void vorbis_comment_add(vorbis_comment *vc, char *comment);
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extern void vorbis_comment_add_tag(vorbis_comment *vc,
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char *tag, char *contents);
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extern char *vorbis_comment_query(vorbis_comment *vc, char *tag, int count);
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extern int vorbis_comment_query_count(vorbis_comment *vc, char *tag);
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extern void vorbis_comment_clear(vorbis_comment *vc);
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extern int vorbis_block_init(vorbis_dsp_state *v, vorbis_block *vb);
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extern int vorbis_block_clear(vorbis_block *vb);
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extern void vorbis_dsp_clear(vorbis_dsp_state *v);
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/* Vorbis PRIMITIVES: analysis/DSP layer ****************************/
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extern int vorbis_analysis_init(vorbis_dsp_state *v,vorbis_info *vi);
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extern int vorbis_commentheader_out(vorbis_comment *vc, ogg_packet *op);
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extern int vorbis_analysis_headerout(vorbis_dsp_state *v,
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vorbis_comment *vc,
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ogg_packet *op,
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ogg_packet *op_comm,
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ogg_packet *op_code);
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extern float **vorbis_analysis_buffer(vorbis_dsp_state *v,int vals);
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extern int vorbis_analysis_wrote(vorbis_dsp_state *v,int vals);
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extern int vorbis_analysis_blockout(vorbis_dsp_state *v,vorbis_block *vb);
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extern int vorbis_analysis(vorbis_block *vb,ogg_packet *op);
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extern int vorbis_bitrate_addblock(vorbis_block *vb);
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extern int vorbis_bitrate_flushpacket(vorbis_dsp_state *vd,
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ogg_packet *op);
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/* Vorbis PRIMITIVES: synthesis layer *******************************/
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extern int vorbis_synthesis_headerin(vorbis_info *vi,vorbis_comment *vc,
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ogg_packet *op);
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extern int vorbis_synthesis_init(vorbis_dsp_state *v,vorbis_info *vi);
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extern int vorbis_synthesis(vorbis_block *vb,ogg_packet *op);
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extern int vorbis_synthesis_trackonly(vorbis_block *vb,ogg_packet *op);
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extern int vorbis_synthesis_blockin(vorbis_dsp_state *v,vorbis_block *vb);
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extern int vorbis_synthesis_pcmout(vorbis_dsp_state *v,float ***pcm);
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extern int vorbis_synthesis_read(vorbis_dsp_state *v,int samples);
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extern long vorbis_packet_blocksize(vorbis_info *vi,ogg_packet *op);
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/* Vorbis ERRORS and return codes ***********************************/
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#define OV_FALSE -1
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#define OV_EOF -2
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#define OV_HOLE -3
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#define OV_EREAD -128
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#define OV_EFAULT -129
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#define OV_EIMPL -130
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#define OV_EINVAL -131
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#define OV_ENOTVORBIS -132
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#define OV_EBADHEADER -133
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#define OV_EVERSION -134
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#define OV_ENOTAUDIO -135
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#define OV_EBADPACKET -136
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#define OV_EBADLINK -137
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#define OV_ENOSEEK -138
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#ifdef __cplusplus
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}
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#endif /* __cplusplus */
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#endif
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