/* * 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 * * This file is ripped from the lavtools package (mjpeg.sourceforge.net) * Ported to mplayer by Rik Snel * * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #ifndef MPLAYER_YUV4MPEG_H #define MPLAYER_YUV4MPEG_H #include //#include "mp_msg.h" #include "stream/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 * 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, 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(y4m_stream_info_t *si); void y4m_si_set_height(y4m_stream_info_t *si, int height); int y4m_si_get_height(y4m_stream_info_t *si); void y4m_si_set_interlace(y4m_stream_info_t *si, int interlace); int y4m_si_get_interlace(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(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(y4m_stream_info_t *si); int y4m_si_get_framelength(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, 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(stream_t *s, char *buf, size_t len); #if 0 /* write len bytes from fd into buf */ ssize_t y4m_write(int fd, char *buf, size_t len); #endif /************************************************************************ * 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(stream_t *s, y4m_stream_info_t *i); #if 0 /* write a stream header to file descriptor fd */ int y4m_write_stream_header(int fd, y4m_stream_info_t *i); #endif /************************************************************************ * 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(stream_t *s, y4m_frame_info_t *i); #if 0 /* write a frame header to file descriptor fd */ int y4m_write_frame_header(int fd, y4m_frame_info_t *i); #endif /* read a complete frame (header + data) o yuv[3] points to three buffers, one each for Y, U, V planes */ int y4m_read_frame(stream_t *s, y4m_stream_info_t *si, y4m_frame_info_t *fi, unsigned char *yuv[3]); #if 0 /* 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, y4m_stream_info_t *si, y4m_frame_info_t *fi, unsigned char *yuv[3]); #endif #if 0 /* 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, y4m_stream_info_t *si, y4m_frame_info_t *fi, unsigned char *upper_field[3], unsigned char *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, y4m_stream_info_t *si, y4m_frame_info_t *fi, unsigned char *upper_field[3], unsigned char *lower_field[3]); #endif /************************************************************************ * 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(const char *prefix, 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 /* MPLAYER_YUV4MPEG_H */