author | nemo |
Fri, 12 Aug 2011 12:42:50 -0400 | |
changeset 5551 | 0897b947e7a0 |
parent 5170 | f7e49eff3708 |
permissions | -rw-r--r-- |
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/******************************************************************** |
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* * |
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* THIS FILE IS PART OF THE OggVorbis 'TREMOR' CODEC SOURCE CODE. * |
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* * |
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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 'TREMOR' SOURCE CODE IS (C) COPYRIGHT 1994-2002 * |
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* BY THE Xiph.Org FOUNDATION http://www.xiph.org/ * |
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* * |
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******************************************************************** |
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function: libvorbis codec headers |
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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.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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ogg_int32_t **pcm; |
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ogg_int32_t **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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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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ogg_int32_t **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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} 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: 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_restart(vorbis_dsp_state *v); |
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extern int vorbis_synthesis(vorbis_block *vb,ogg_packet *op,int decodep); |
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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,ogg_int32_t ***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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