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149 lines
3.8 KiB
C
149 lines
3.8 KiB
C
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/*
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* mpegconsts.c: Video format constants for MPEG and utilities for display
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* and conversion to format used for yuv4mpeg
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*
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* Copyright (C) 2001 Andrew Stevens <andrew.stevens@philips.com>
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*
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of version 2 of the GNU General Public License
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifndef __MPEGCONSTS_H__
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#define __MPEGCONSTS_H__
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#include "yuv4mpeg.h"
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typedef unsigned int mpeg_framerate_code_t;
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typedef unsigned int mpeg_aspect_code_t;
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extern const mpeg_framerate_code_t mpeg_num_framerates;
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extern const mpeg_aspect_code_t mpeg_num_aspect_ratios[2];
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*
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* Convert MPEG frame-rate code to corresponding frame-rate
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* y4m_fps_UNKNOWN = { 0, 0 } = Undefined/resrerved code.
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*/
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y4m_ratio_t
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mpeg_framerate( mpeg_framerate_code_t code );
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/*
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* Look-up MPEG frame rate code for a (exact) frame rate.
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* 0 = No MPEG code defined for frame-rate
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*/
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mpeg_framerate_code_t
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mpeg_framerate_code( y4m_ratio_t framerate );
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/*
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* Convert floating-point framerate to an exact ratio.
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* Uses a standard MPEG rate, if it finds one within MPEG_FPS_TOLERANCE
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* (see mpegconsts.c), otherwise uses "fps:1000000" as the ratio.
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*/
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y4m_ratio_t
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mpeg_conform_framerate( double fps );
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/*
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* Convert MPEG aspect ratio code to corresponding aspect ratio
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*
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* WARNING: The semantics of aspect ratio coding *changed* between
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* MPEG1 and MPEG2. In MPEG1 it is the *pixel* aspect ratio. In
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* MPEG2 it is the (far more sensible) aspect ratio of the eventual
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* display.
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*
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*/
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y4m_ratio_t
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mpeg_aspect_ratio( int mpeg_version, mpeg_aspect_code_t code );
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/*
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* Look-up MPEG aspect ratio code for an aspect ratio - tolerance
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* is Y4M_ASPECT_MULT used by YUV4MPEG (see yuv4mpeg_intern.h)
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*
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* WARNING: The semantics of aspect ratio coding *changed* between
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* MPEG1 and MPEG2. In MPEG1 it is the *pixel* aspect ratio. In
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* MPEG2 it is the (far more sensible) aspect ratio of the eventual
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* display.
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*
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*/
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mpeg_aspect_code_t
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mpeg_frame_aspect_code( int mpeg_version, y4m_ratio_t aspect_ratio );
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/*
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* Look-up MPEG explanatory definition string aspect ratio code for an
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* aspect ratio code
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*
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*/
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const char *
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mpeg_aspect_code_definition( int mpeg_version, mpeg_aspect_code_t code );
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/*
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* Look-up MPEG explanatory definition string aspect ratio code for an
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* frame rate code
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*
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*/
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const char *
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mpeg_framerate_code_definition( mpeg_framerate_code_t code );
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const char *
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mpeg_interlace_code_definition( int yuv4m_interlace_code );
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/*
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* Guess the correct MPEG aspect ratio code,
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* given the true sample aspect ratio and frame size of a video stream
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* (and the MPEG version, 1 or 2).
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*
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* Returns 0 if it has no good answer.
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*
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*/
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mpeg_aspect_code_t
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mpeg_guess_mpeg_aspect_code(int mpeg_version, y4m_ratio_t sampleaspect,
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int frame_width, int frame_height);
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/*
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* Guess the true sample aspect ratio of a video stream,
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* given the MPEG aspect ratio code and the actual frame size
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* (and the MPEG version, 1 or 2).
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*
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* Returns y4m_sar_UNKNOWN if it has no good answer.
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*
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*/
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y4m_ratio_t
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mpeg_guess_sample_aspect_ratio(int mpeg_version,
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mpeg_aspect_code_t code,
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int frame_width, int frame_height);
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#ifdef __cplusplus
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};
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#endif
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#endif /* __MPEGCONSTS_H__ */
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