yuv4mpeg.h

自己移植的linux下的流媒体播放器原代码,支持mms协议,支持ftp和http协议.

/*
 *  yuv4mpeg.h:  Functions for reading and writing "new" YUV4MPEG2 streams.
 *
 *               Stream format is described at the end of this file.
 *
 *
 *  Copyright (C) 2001 Matthew J. Marjanovic <[e-mail]>
 *
 *  This file is ripped from the lavtools package (mjpeg.sourceforge.net)
 *  Ported to mplayer by Rik Snel <[e-mail]>
 *
 *  This program is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU General Public License
 *  as published by the Free Software Foundation; either version 2
 *  of the License, or (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

#ifndef __YUV4MPEG_H__
#define __YUV4MPEG_H__

#include <stdlib.h>
//#include "mp_msg.h"
#include "stream.h"



/************************************************************************
 *  error codes returned by y4m_* functions
 ************************************************************************/
#define Y4M_OK          0
#define Y4M_ERR_RANGE   1
#define Y4M_ERR_SYSTEM  2
#define Y4M_ERR_HEADER  3
#define Y4M_ERR_BADTAG  4
#define Y4M_ERR_MAGIC   5
#define Y4M_ERR_EOF     6
#define Y4M_ERR_XXTAGS  7


/* generic 'unknown' value for integer parameters (e.g. interlace, height) */
#define Y4M_UNKNOWN -1



/************************************************************************
 *  'ratio' datatype, for rational numbers
 *                                     (see 'ratio' functions down below)
 ************************************************************************/
typedef struct _y4m_ratio {
  int n;  /* numerator   */
  int d;  /* denominator */
} y4m_ratio_t;


/************************************************************************
 *  useful standard framerates (as ratios)
 ************************************************************************/
extern const y4m_ratio_t y4m_fps_UNKNOWN;
extern const y4m_ratio_t y4m_fps_NTSC_FILM;  /* 24000/1001 film (in NTSC)  */
extern const y4m_ratio_t y4m_fps_FILM;       /* 24fps film                 */
extern const y4m_ratio_t y4m_fps_PAL;        /* 25fps PAL                  */
extern const y4m_ratio_t y4m_fps_NTSC;       /* 30000/1001 NTSC            */
extern const y4m_ratio_t y4m_fps_30;         /* 30fps                      */
extern const y4m_ratio_t y4m_fps_PAL_FIELD;  /* 50fps PAL field rate       */
extern const y4m_ratio_t y4m_fps_NTSC_FIELD; /* 60000/1001 NTSC field rate */
extern const y4m_ratio_t y4m_fps_60;         /* 60fps                      */

/************************************************************************
 *  useful standard sample (pixel) aspect ratios
 ************************************************************************/
extern const y4m_ratio_t y4m_sar_UNKNOWN; 
extern const y4m_ratio_t y4m_sar_SQUARE;        /* square pixels */
extern const y4m_ratio_t y4m_sar_NTSC_CCIR601;  /* 525-line (NTSC) Rec.601 */
extern const y4m_ratio_t y4m_sar_NTSC_16_9;     /* 16:9 NTSC/Rec.601       */
extern const y4m_ratio_t y4m_sar_NTSC_SVCD_4_3; /* NTSC SVCD 4:3           */
extern const y4m_ratio_t y4m_sar_NTSC_SVCD_16_9;/* NTSC SVCD 16:9          */
extern const y4m_ratio_t y4m_sar_PAL_CCIR601;   /* 625-line (PAL) Rec.601  */
extern const y4m_ratio_t y4m_sar_PAL_16_9;      /* 16:9 PAL/Rec.601        */
extern const y4m_ratio_t y4m_sar_PAL_SVCD_4_3;  /* PAL SVCD 4:3            */
extern const y4m_ratio_t y4m_sar_PAL_SVCD_16_9; /* PAL SVCD 16:9           */


/************************************************************************
 *  'xtag_list' --- list of unparsed and/or meta/X header tags
 *
 *     Do not touch this structure directly!
 *
 *     Use the y4m_xtag_*() functions (see below).
 *     You must initialize/finalize this structure before/after use.
 ************************************************************************/
#define Y4M_MAX_XTAGS 32        /* maximum number of xtags in list       */
#define Y4M_MAX_XTAG_SIZE 32    /* max length of an xtag (including 'X') */
typedef struct _y4m_xtag_list {
  int count;
  char *tags[Y4M_MAX_XTAGS];
} y4m_xtag_list_t;



/************************************************************************
 *  'stream_info' --- stream header information
 *
 *     Do not touch this structure directly!
 *
 *     Use the y4m_si_*() functions (see below).
 *     You must initialize/finalize this structure before/after use.
 ************************************************************************/
typedef struct _y4m_stream_info {
  /* values from header */
  int width;
  int height;
  int interlace;            /* see Y4M_ILACE_* definitions below   */
  y4m_ratio_t framerate;    /* frames-per-second;   0:0 == unknown */
  y4m_ratio_t sampleaspect; /* pixel width/height;  0:0 == unknown */
  /* computed/derivative values */
  int framelength;    /* bytes of data per frame (not including header) */
  /* mystical X tags */
  y4m_xtag_list_t x_tags;
} y4m_stream_info_t;

/* possible options for the interlace parameter */
#define Y4M_ILACE_NONE          0   /* non-interlaced, progressive frame */
#define Y4M_ILACE_TOP_FIRST     1   /* interlaced, top-field first       */
#define Y4M_ILACE_BOTTOM_FIRST  2   /* interlaced, bottom-field first    */


/************************************************************************
 *  'frame_info' --- frame header information
 *
 *     Do not touch this structure directly!
 *
 *     Use the y4m_fi_*() functions (see below).
 *     You must initialize/finalize this structure before/after use.
 ************************************************************************/
typedef struct _y4m_frame_info {
  /* mystical X tags */
  y4m_xtag_list_t x_tags;
} y4m_frame_info_t;



#ifdef __cplusplus
extern "C" {
#else
#endif


/************************************************************************
 *  'ratio' functions
 ************************************************************************/

/* 'normalize' a ratio (remove common factors) */
void y4m_ratio_reduce(y4m_ratio_t *r);

/* parse "nnn:ddd" into a ratio (returns Y4M_OK or Y4M_ERR_RANGE) */
int y4m_parse_ratio(y4m_ratio_t *r, const char *s);

/* quick test of two ratios for equality (i.e. identical components) */
#define Y4M_RATIO_EQL(a,b) ( ((a).n == (b).n) && ((a).d == (b).d) )

/* quick conversion of a ratio to a double (no divide-by-zero check!) */
#define Y4M_RATIO_DBL(r) ((double)(r).n / (double)(r).d)



/************************************************************************
 *  'xtag' functions
 *
 * o Before using an xtag_list (but after the structure/memory has been
 *    allocated), you must initialize it via y4m_init_xtag_list().
 * o After using an xtag_list (but before the structure is released),
 *    call y4m_fini_xtag_list() to free internal memory.
 *
 ************************************************************************/

/* initialize an xtag_list structure */
void y4m_init_xtag_list(y4m_xtag_list_t *xtags);

/* finalize an xtag_list structure */
void y4m_fini_xtag_list(y4m_xtag_list_t *xtags);

/* make one xtag_list into a copy of another */
void y4m_copy_xtag_list(y4m_xtag_list_t *dest, const y4m_xtag_list_t *src);

/* return number of tags in an xtag_list */
int y4m_xtag_count(const y4m_xtag_list_t *xtags);

/* access n'th tag in an xtag_list */
const char *y4m_xtag_get(const y4m_xtag_list_t *xtags, int n);

/* append a new tag to an xtag_list
    returns:          Y4M_OK - success
              Y4M_ERR_XXTAGS - list is already full */
int y4m_xtag_add(y4m_xtag_list_t *xtags, const char *tag);

/* remove a tag from an xtag_list 
    returns:         Y4M_OK - success
              Y4M_ERR_RANGE - n is out of range */
int y4m_xtag_remove(y4m_xtag_list_t *xtags, int n);

/* remove all tags from an xtag_list 
    returns:   Y4M_OK - success       */
int y4m_xtag_clearlist(y4m_xtag_list_t *xtags);

/* append copies of tags from src list to dest list
    returns:          Y4M_OK - success
              Y4M_ERR_XXTAGS - operation would overfill dest list */
int y4m_xtag_addlist(y4m_xtag_list_t *dest, const y4m_xtag_list_t *src);



/************************************************************************
 *  '*_info' functions
 *
 * o Before using a *_info structure (but after the structure/memory has
 *    been allocated), you must initialize it via y4m_init_*_info().
 * o After using a *_info structure (but before the structure is released),
 *    call y4m_fini_*_info() to free internal memory.
 * o Use the 'set' and 'get' accessors to modify or access the fields in