/******************************************************************** * * * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE. * * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS * * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE * * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. * * * * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2001 * * by the Xiph.Org Foundation https://xiph.org/ * ******************************************************************** function: libvorbis codec headers ********************************************************************/ #ifndef _vorbis_codec_h_ #define _vorbis_codec_h_ #ifdef __cplusplus extern "C" { #endif /* __cplusplus */ #include <ogg/ogg.h> vorbis_info; /* vorbis_dsp_state buffers the current vorbis audio analysis/synthesis state. The DSP state belongs to a specific logical bitstream ****************************************************/ vorbis_dsp_state; vorbis_block; /* vorbis_block is a single block of data to be processed as part of the analysis/synthesis stream; it belongs to a specific logical bitstream, but is independent from other vorbis_blocks belonging to that logical bitstream. *************************************************/ struct alloc_chain{ … }; /* vorbis_info contains all the setup information specific to the specific compression/decompression mode in progress (eg, psychoacoustic settings, channel setup, options, codebook etc). vorbis_info and substructures are in backends.h. *********************************************************************/ /* the comments are not part of vorbis_info so that vorbis_info can be static storage */ vorbis_comment; /* libvorbis encodes in two abstraction layers; first we perform DSP and produce a packet (see docs/analysis.txt). The packet is then coded into a framed OggSquish bitstream by the second layer (see docs/framing.txt). Decode is the reverse process; we sync/frame the bitstream and extract individual packets, then decode the packet back into PCM audio. The extra framing/packetizing is used in streaming formats, such as files. Over the net (such as with UDP), the framing and packetization aren't necessary as they're provided by the transport and the streaming layer is not used */ /* Vorbis PRIMITIVES: general ***************************************/ extern void vorbis_info_init(vorbis_info *vi); extern void vorbis_info_clear(vorbis_info *vi); extern int vorbis_info_blocksize(vorbis_info *vi,int zo); extern void vorbis_comment_init(vorbis_comment *vc); extern void vorbis_comment_add(vorbis_comment *vc, const char *comment); extern void vorbis_comment_add_tag(vorbis_comment *vc, const char *tag, const char *contents); extern char *vorbis_comment_query(vorbis_comment *vc, const char *tag, int count); extern int vorbis_comment_query_count(vorbis_comment *vc, const char *tag); extern void vorbis_comment_clear(vorbis_comment *vc); extern int vorbis_block_init(vorbis_dsp_state *v, vorbis_block *vb); extern int vorbis_block_clear(vorbis_block *vb); extern void vorbis_dsp_clear(vorbis_dsp_state *v); extern double vorbis_granule_time(vorbis_dsp_state *v, ogg_int64_t granulepos); extern const char *vorbis_version_string(void); /* Vorbis PRIMITIVES: analysis/DSP layer ****************************/ extern int vorbis_analysis_init(vorbis_dsp_state *v,vorbis_info *vi); extern int vorbis_commentheader_out(vorbis_comment *vc, ogg_packet *op); extern int vorbis_analysis_headerout(vorbis_dsp_state *v, vorbis_comment *vc, ogg_packet *op, ogg_packet *op_comm, ogg_packet *op_code); extern float **vorbis_analysis_buffer(vorbis_dsp_state *v,int vals); extern int vorbis_analysis_wrote(vorbis_dsp_state *v,int vals); extern int vorbis_analysis_blockout(vorbis_dsp_state *v,vorbis_block *vb); extern int vorbis_analysis(vorbis_block *vb,ogg_packet *op); extern int vorbis_bitrate_addblock(vorbis_block *vb); extern int vorbis_bitrate_flushpacket(vorbis_dsp_state *vd, ogg_packet *op); /* Vorbis PRIMITIVES: synthesis layer *******************************/ extern int vorbis_synthesis_idheader(ogg_packet *op); extern int vorbis_synthesis_headerin(vorbis_info *vi,vorbis_comment *vc, ogg_packet *op); extern int vorbis_synthesis_init(vorbis_dsp_state *v,vorbis_info *vi); extern int vorbis_synthesis_restart(vorbis_dsp_state *v); extern int vorbis_synthesis(vorbis_block *vb,ogg_packet *op); extern int vorbis_synthesis_trackonly(vorbis_block *vb,ogg_packet *op); extern int vorbis_synthesis_blockin(vorbis_dsp_state *v,vorbis_block *vb); extern int vorbis_synthesis_pcmout(vorbis_dsp_state *v,float ***pcm); extern int vorbis_synthesis_lapout(vorbis_dsp_state *v,float ***pcm); extern int vorbis_synthesis_read(vorbis_dsp_state *v,int samples); extern long vorbis_packet_blocksize(vorbis_info *vi,ogg_packet *op); extern int vorbis_synthesis_halfrate(vorbis_info *v,int flag); extern int vorbis_synthesis_halfrate_p(vorbis_info *v); /* Vorbis ERRORS and return codes ***********************************/ #define OV_FALSE … #define OV_EOF … #define OV_HOLE … #define OV_EREAD … #define OV_EFAULT … #define OV_EIMPL … #define OV_EINVAL … #define OV_ENOTVORBIS … #define OV_EBADHEADER … #define OV_EVERSION … #define OV_ENOTAUDIO … #define OV_EBADPACKET … #define OV_EBADLINK … #define OV_ENOSEEK … #ifdef __cplusplus } #endif /* __cplusplus */ #endif
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