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gstreamer/ext/mplex/yuv4mpeg.h
Wim Taymans 1496394c0f First stab at porting mplex 
Original commit message from CVS:
First stab at porting mplex
2002-10-24 22:37:51 +00:00

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/*
* 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 <maddog@mir.com>
*
*
* 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 <mjpeg_types.h>
#include <unistd.h>
#include <mjpeg_logging.h>
/************************************************************************
* error codes returned by y4m_* functions
************************************************************************/
#define Y4M_OK 0
#define Y4M_ERR_RANGE 1 /* argument or tag value out of range */
#define Y4M_ERR_SYSTEM 2 /* failed system call, check errno */
#define Y4M_ERR_HEADER 3 /* illegal/malformed header */
#define Y4M_ERR_BADTAG 4 /* illegal tag character */
#define Y4M_ERR_MAGIC 5 /* bad header magic */
#define Y4M_ERR_EOF 6 /* end-of-file (clean) */
#define Y4M_ERR_XXTAGS 7 /* too many xtags */
#define Y4M_ERR_BADEOF 8 /* unexpected end-of-file */
/* 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 (W:H)
************************************************************************/
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 */
extern const y4m_ratio_t y4m_sar_SQR_ANA16_9; /* anamorphic 16:9 sampled */
/* from 4:3 with square pixels */
/************************************************************************
* useful standard display aspect ratios (W:H)
************************************************************************/
extern const y4m_ratio_t y4m_dar_UNKNOWN;
extern const y4m_ratio_t y4m_dar_4_3; /* standard TV */
extern const y4m_ratio_t y4m_dar_16_9; /* widescreen TV */
extern const y4m_ratio_t y4m_dar_221_100; /* word-to-your-mother TV */
/************************************************************************
* '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)
/*************************************************************************
*
* Guess the true SAR (sample aspect ratio) from a list of commonly
* encountered values, given the "suggested" display aspect ratio (DAR),
* and the true frame width and height.
*
* Returns y4m_sar_UNKNOWN if no match is found.
*
*************************************************************************/
y4m_ratio_t y4m_guess_sar(int width, int height, y4m_ratio_t dar);
/************************************************************************
* '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
* the structures; don't touch the structure directly. (Ok, so there
* is no really convenient C syntax to prevent you from doing this,
* but we are all responsible programmers here, so just don't do it!)
*
************************************************************************/
/* initialize a stream_info structure */
void y4m_init_stream_info(y4m_stream_info_t *i);
/* finalize a stream_info structure */
void y4m_fini_stream_info(y4m_stream_info_t *i);
/* make one stream_info into a copy of another */
void y4m_copy_stream_info(y4m_stream_info_t *dest,
const y4m_stream_info_t *src);
/* access or set stream_info fields */
void y4m_si_set_width(y4m_stream_info_t *si, int width);
int y4m_si_get_width(const y4m_stream_info_t *si);
void y4m_si_set_height(y4m_stream_info_t *si, int height);
int y4m_si_get_height(const y4m_stream_info_t *si);
void y4m_si_set_interlace(y4m_stream_info_t *si, int interlace);
int y4m_si_get_interlace(const y4m_stream_info_t *si);
void y4m_si_set_framerate(y4m_stream_info_t *si, y4m_ratio_t framerate);
y4m_ratio_t y4m_si_get_framerate(const y4m_stream_info_t *si);
void y4m_si_set_sampleaspect(y4m_stream_info_t *si, y4m_ratio_t sar);
y4m_ratio_t y4m_si_get_sampleaspect(const y4m_stream_info_t *si);
int y4m_si_get_framelength(const y4m_stream_info_t *si);
/* access stream_info xtag_list */
y4m_xtag_list_t *y4m_si_xtags(y4m_stream_info_t *si);
/* initialize a frame_info structure */
void y4m_init_frame_info(y4m_frame_info_t *i);
/* finalize a frame_info structure */
void y4m_fini_frame_info(y4m_frame_info_t *i);
/* make one frame_info into a copy of another */
void y4m_copy_frame_info(y4m_frame_info_t *dest,
const y4m_frame_info_t *src);
/* access frame_info xtag_list */
y4m_xtag_list_t *y4m_fi_xtags(y4m_frame_info_t *fi);
/************************************************************************
* blocking read and write functions
*
* o guaranteed to transfer entire payload (or fail)
* o return values:
* 0 (zero) complete success
* -(# of remaining bytes) error (and errno left set)
* +(# of remaining bytes) EOF (for y4m_read only)
*
************************************************************************/
/* read len bytes from fd into buf */
ssize_t y4m_read(int fd, void *buf, size_t len);
/* write len bytes from fd into buf */
ssize_t y4m_write(int fd, const void *buf, size_t len);
/************************************************************************
* stream header processing functions
*
* o return values:
* Y4M_OK - success
* Y4M_ERR_* - error (see y4m_strerr() for descriptions)
*
************************************************************************/
/* parse a string of stream header tags */
int y4m_parse_stream_tags(char *s, y4m_stream_info_t *i);
/* read a stream header from file descriptor fd */
int y4m_read_stream_header(int fd, y4m_stream_info_t *i);
/* write a stream header to file descriptor fd */
int y4m_write_stream_header(int fd, const y4m_stream_info_t *i);
/************************************************************************
* frame processing functions
*
* o return values:
* Y4M_OK - success
* Y4M_ERR_* - error (see y4m_strerr() for descriptions)
*
************************************************************************/
/* read a frame header from file descriptor fd */
int y4m_read_frame_header(int fd, y4m_frame_info_t *i);
/* write a frame header to file descriptor fd */
int y4m_write_frame_header(int fd, const y4m_frame_info_t *i);
/* read a complete frame (header + data)
o yuv[3] points to three buffers, one each for Y, U, V planes */
int y4m_read_frame(int fd, const y4m_stream_info_t *si,
y4m_frame_info_t *fi, uint8_t * const yuv[3]);
/* write a complete frame (header + data)
o yuv[3] points to three buffers, one each for Y, U, V planes */
int y4m_write_frame(int fd, const y4m_stream_info_t *si,
const y4m_frame_info_t *fi, uint8_t * const yuv[3]);
/* read a complete frame (header + data), but de-interleave fields
into two separate buffers
o upper_field[3] same as yuv[3] above, but for upper field
o lower_field[3] same as yuv[3] above, but for lower field
*/
int y4m_read_fields(int fd, const y4m_stream_info_t *si,
y4m_frame_info_t *fi,
uint8_t * const upper_field[3],
uint8_t * const lower_field[3]);
/* write a complete frame (header + data), but interleave fields
from two separate buffers
o upper_field[3] same as yuv[3] above, but for upper field
o lower_field[3] same as yuv[3] above, but for lower field
*/
int y4m_write_fields(int fd, const y4m_stream_info_t *si,
const y4m_frame_info_t *fi,
uint8_t * const upper_field[3],
uint8_t * const lower_field[3]);
/************************************************************************
* miscellaneous functions
************************************************************************/
/* convenient dump of stream header info via mjpeg_log facility
* - each logged/printed line is prefixed by 'prefix'
*/
void y4m_log_stream_info(log_level_t level, const char *prefix,
const y4m_stream_info_t *i);
/* convert a Y4M_ERR_* error code into mildly explanatory string */
const char *y4m_strerr(int err);
/* set 'allow_unknown_tag' flag for library...
o yn = 0 : unknown header tags will produce a parsing error
o yn = 1 : unknown header tags/values will produce a warning, but
are otherwise passed along via the xtags list
o yn = -1: don't change, just return current setting
return value: previous setting of flag
*/
int y4m_allow_unknown_tags(int yn);
#ifdef __cplusplus
}
#endif
/************************************************************************
************************************************************************
Description of the (new!, forever?) YUV4MPEG2 stream format:
STREAM consists of
o one '\n' terminated STREAM-HEADER
o unlimited number of FRAMEs
FRAME consists of
o one '\n' terminated FRAME-HEADER
o "length" octets of planar YCrCb 4:2:0 image data
(if frame is interlaced, then the two fields are interleaved)
STREAM-HEADER consists of
o string "YUV4MPEG2 " (note the space after the '2')
o unlimited number of ' ' separated TAGGED-FIELDs
o '\n' line terminator
FRAME-HEADER consists of
o string "FRAME " (note the space after the 'E')
o unlimited number of ' ' separated TAGGED-FIELDs
o '\n' line terminator
TAGGED-FIELD consists of
o single ascii character tag
o VALUE (which does not contain whitespace)
VALUE consists of
o integer (base 10 ascii representation)
or o RATIO
or o single ascii character
or o generic ascii string
RATIO consists of
o numerator (integer)
o ':' (a colon)
o denominator (integer)
The currently supported tags for the STREAM-HEADER:
W - [integer] frame width, pixels, should be > 0
H - [integer] frame height, pixels, should be > 0
I - [char] interlacing: p - progressive (none)
t - top-field-first
b - bottom-field-first
? - unknown
F - [ratio] frame-rate, 0:0 == unknown
A - [ratio] sample (pixel) aspect ratio, 0:0 == unknown
X - [character string] 'metadata' (unparsed, but passed around)
The currently supported tags for the FRAME-HEADER:
X - character string 'metadata' (unparsed, but passed around)
************************************************************************
************************************************************************/
#endif /* __YUV4MPEG_H__ */
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