theora.h

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/********************************************************************
 *                                                                  *
 * THIS FILE IS PART OF THE OggTheora 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 Theora SOURCE CODE IS COPYRIGHT (C) 2002-2003                *
 * by the Xiph.Org Foundation http://www.xiph.org/                  *
 *                                                                  *
 ********************************************************************

  function:
  last mod: $Id: theora.h,v 1.17 2003/12/06 18:06:19 arc Exp $

 ********************************************************************/

#ifndef _O_THEORA_H_
#define _O_THEORA_H_

#ifdef __cplusplus
extern "C"
{
#endif /* __cplusplus */

#ifndef LIBOGG2
#include <ogg/ogg.h>
#else
#include <ogg2/ogg.h>
/* This is temporary until libogg2 is more complete */
ogg_buffer_state *ogg_buffer_create(void);
#endif

typedef struct {
    int   y_width;      
    int   y_height;     
    int   y_stride;     
    int   uv_width;     
    int   uv_height;    
    int   uv_stride;    
    unsigned char *y;   
    unsigned char *u;   
    unsigned char *v;   
} yuv_buffer;

typedef enum {
  OC_CS_UNSPECIFIED,    
  OC_CS_ITU_REC_470M,   
  OC_CS_ITU_REC_470BG,  
} theora_colorspace;

typedef struct {
  ogg_uint32_t  width;
  ogg_uint32_t  height;
  ogg_uint32_t  frame_width;
  ogg_uint32_t  frame_height;
  ogg_uint32_t  offset_x;
  ogg_uint32_t  offset_y;
  ogg_uint32_t  fps_numerator;
  ogg_uint32_t  fps_denominator;
  ogg_uint32_t  aspect_numerator;
  ogg_uint32_t  aspect_denominator;
  theora_colorspace colorspace;
  int           target_bitrate;
  int           quality;  
  int           quick_p;  
  /* decode only */
  unsigned char version_major;
  unsigned char version_minor;
  unsigned char version_subminor;

  void *codec_setup;

  /* encode only */
  int           dropframes_p;
  int           keyframe_auto_p;
  ogg_uint32_t  keyframe_frequency;
  ogg_uint32_t  keyframe_frequency_force;  /* also used for decode init to
                                              get granpos shift correct */
  ogg_uint32_t  keyframe_data_target_bitrate;
  ogg_int32_t   keyframe_auto_threshold;
  ogg_uint32_t  keyframe_mindistance;
  ogg_int32_t   noise_sensitivity;
  ogg_int32_t   sharpness;

} theora_info;

typedef struct{
  theora_info *i;
  ogg_int64_t granulepos;

  void *internal_encode;
  void *internal_decode;

} theora_state;

typedef struct theora_comment{
  char **user_comments;         
  int   *comment_lengths;       
  int    comments;              
  char  *vendor;                
} theora_comment;

#define OC_FAULT       -1       
#define OC_EINVAL      -10      
#define OC_DISABLED    -11      
#define OC_BADHEADER   -20      
#define OC_NOTFORMAT   -21      
#define OC_VERSION     -22      
#define OC_IMPL        -23      
#define OC_BADPACKET   -24      
#define OC_NEWPACKET   -25      
extern const char *theora_version_string(void);

extern ogg_uint32_t theora_version_number(void);

extern int theora_encode_init(theora_state *th, theora_info *c);

extern int theora_encode_YUVin(theora_state *t, yuv_buffer *yuv);

extern int theora_encode_packetout( theora_state *t, int last_p,
                                    ogg_packet *op);

extern int theora_encode_header(theora_state *t, ogg_packet *op);

extern int theora_encode_comment(theora_comment *tc, ogg_packet *op);

extern int theora_encode_tables(theora_state *t, ogg_packet *op);

extern int theora_decode_header(theora_info *ci, theora_comment *cc,
                                ogg_packet *op);

extern int theora_decode_init(theora_state *th, theora_info *c);

extern int theora_decode_packetin(theora_state *th,ogg_packet *op);

extern int theora_decode_YUVout(theora_state *th,yuv_buffer *yuv);

extern int theora_packet_isheader(ogg_packet *op);

extern int theora_packet_iskeyframe(ogg_packet *op);

extern ogg_int64_t theora_granule_frame(theora_state *th,ogg_int64_t granulepos);

extern double theora_granule_time(theora_state *th,ogg_int64_t granulepos);

extern void theora_info_init(theora_info *c);

extern void theora_info_clear(theora_info *c);

extern void theora_clear(theora_state *t);

extern void theora_comment_init(theora_comment *tc);
extern void theora_comment_add(theora_comment *tc, char *comment);
extern void theora_comment_add_tag(theora_comment *tc,
                                       char *tag, char *value);
extern char *theora_comment_query(theora_comment *tc, char *tag, int count);
extern int   theora_comment_query_count(theora_comment *tc, char *tag);
extern void  theora_comment_clear(theora_comment *tc);

#ifdef __cplusplus
}
#endif /* __cplusplus */

#endif /* _O_THEORA_H_ */

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