vlc_es.h 10.2 KB
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/*****************************************************************************
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 * vlc_es.h: Elementary stream formats descriptions
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 *****************************************************************************
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 * Copyright (C) 1999-2001 the VideoLAN team
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 * $Id$
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 *
 * Authors: Laurent Aimar <fenrir@via.ecp.fr>
 *
 * 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
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
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 *****************************************************************************/

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#ifndef VLC_ES_H
#define VLC_ES_H 1
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/* FIXME: i'm not too sure about this include but it fixes compilation of
 * video chromas -- dionoea */
#include "vlc_common.h"
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#include <vlc_fourcc.h>
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/**
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 * \file
 * This file defines the elementary streams format types
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 */
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/**
 * video palette data
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 * \see video_format_t
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 * \see subs_format_t
 */
struct video_palette_t
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{
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    int i_entries;      /**< to keep the compatibility with ffmpeg's palette */
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    uint8_t palette[256][4];                   /**< 4-byte RGBA/YUVA palette */
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};
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/**
 * audio replay gain description
 */
#define AUDIO_REPLAY_GAIN_MAX (2)
#define AUDIO_REPLAY_GAIN_TRACK (0)
#define AUDIO_REPLAY_GAIN_ALBUM (1)
typedef struct
{
    /* true if we have the peak value */
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    bool pb_peak[AUDIO_REPLAY_GAIN_MAX];
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    /* peak value where 1.0 means full sample value */
    float      pf_peak[AUDIO_REPLAY_GAIN_MAX];

    /* true if we have the gain value */
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    bool pb_gain[AUDIO_REPLAY_GAIN_MAX];
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    /* gain value in dB */
    float      pf_gain[AUDIO_REPLAY_GAIN_MAX];
} audio_replay_gain_t;

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/**
 * audio format description
 */
struct audio_format_t
{
    vlc_fourcc_t i_format;                          /**< audio format fourcc */
    unsigned int i_rate;                              /**< audio sample-rate */
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    /* Describes the channels configuration of the samples (ie. number of
     * channels which are available in the buffer, and positions). */
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    uint32_t     i_physical_channels;
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    /* Describes from which original channels, before downmixing, the
     * buffer is derived. */
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    uint32_t     i_original_channels;
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    /* Optional - for A/52, SPDIF and DTS types : */
    /* Bytes used by one compressed frame, depends on bitrate. */
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    unsigned int i_bytes_per_frame;
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    /* Number of sampleframes contained in one compressed frame. */
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    unsigned int i_frame_length;
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    /* Please note that it may be completely arbitrary - buffers are not
     * obliged to contain a integral number of so-called "frames". It's
     * just here for the division :
     * buffer_size = i_nb_samples * i_bytes_per_frame / i_frame_length
     */

    /* FIXME ? (used by the codecs) */
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    unsigned     i_bitspersample;
    unsigned     i_blockalign;
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    uint8_t      i_channels; /* must be <=32 */
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    uint8_t      i_flavor;
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};

/**
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 * video format description
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 */
struct video_format_t
{
    vlc_fourcc_t i_chroma;                               /**< picture chroma */
    unsigned int i_aspect;                                 /**< aspect ratio */

    unsigned int i_width;                                 /**< picture width */
    unsigned int i_height;                               /**< picture height */
    unsigned int i_x_offset;               /**< start offset of visible area */
    unsigned int i_y_offset;               /**< start offset of visible area */
    unsigned int i_visible_width;                 /**< width of visible area */
    unsigned int i_visible_height;               /**< height of visible area */

    unsigned int i_bits_per_pixel;             /**< number of bits per pixel */

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    unsigned int i_sar_num;                   /**< sample/pixel aspect ratio */
    unsigned int i_sar_den;

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    unsigned int i_frame_rate;                     /**< frame rate numerator */
    unsigned int i_frame_rate_base;              /**< frame rate denominator */
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    int i_rmask, i_gmask, i_bmask;          /**< color masks for RGB chroma */
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    int i_rrshift, i_lrshift;
    int i_rgshift, i_lgshift;
    int i_rbshift, i_lbshift;
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    video_palette_t *p_palette;              /**< video palette from demuxer */
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};

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/**
 * Initialize a video_format_t structure with chroma 'i_chroma'
 * \param p_src pointer to video_format_t structure
 * \param i_chroma chroma value to use
 */
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static inline void video_format_Init( video_format_t *p_src, vlc_fourcc_t i_chroma )
{
    memset( p_src, 0, sizeof( video_format_t ) );
    p_src->i_chroma = i_chroma;
    p_src->i_sar_num = p_src->i_sar_den = 1;
    p_src->p_palette = NULL;
}

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/**
 * Copy video_format_t including the palette
 * \param p_dst video_format_t to copy to
 * \param p_src video_format_t to copy from
 */
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static inline int video_format_Copy( video_format_t *p_dst, video_format_t *p_src )
{
    memcpy( p_dst, p_src, sizeof( video_format_t ) );
    if( p_src->p_palette )
    {
        p_dst->p_palette = (video_palette_t *) malloc( sizeof( video_palette_t ) );
        if( !p_dst->p_palette )
            return VLC_ENOMEM;
        memcpy( p_dst->p_palette, p_src->p_palette, sizeof( video_palette_t ) );
    }
    return VLC_SUCCESS;
};

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/**
 * Cleanup and free palette of this video_format_t
 * \param p_src video_format_t structure to clean
 */
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static inline void video_format_Clean( video_format_t *p_src )
{
    free( p_src->p_palette );
    memset( p_src, 0, sizeof( video_format_t ) );
    p_src->p_palette = NULL;
}

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/**
 * It will fill up a video_format_tvideo_format_t using the given arguments.
 * Becarefull that the video_format_t must already be initialized.
 */
VLC_EXPORT( void, video_format_Setup, ( video_format_t *, vlc_fourcc_t i_chroma, int i_width, int i_height, int i_aspect ) );

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/**
 * This function will check if the first video format is similar
 * to the second one.
 */
VLC_EXPORT( bool, video_format_IsSimilar, ( const video_format_t *, const video_format_t * ) );

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/**
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 * subtitles format description
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 */
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struct subs_format_t
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{
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    /* the character encoding of the text of the subtitle.
     * all gettext recognized shorts can be used */
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    char *psz_encoding;

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    int  i_x_origin; /**< x coordinate of the subtitle. 0 = left */
    int  i_y_origin; /**< y coordinate of the subtitle. 0 = top */

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    struct
    {
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        /*  */
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        uint32_t palette[16+1];
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        /* the width of the original movie the spu was extracted from */
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        int i_original_frame_width;
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        /* the height of the original movie the spu was extracted from */
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        int i_original_frame_height;
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    } spu;
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    struct
    {
        int i_id;
    } dvb;
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    struct
    {
        int i_magazine;
        int i_page;
    } teletext;
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};
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/**
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 * ES language definition
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 */
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typedef struct extra_languages_t
{
        char *psz_language;
        char *psz_description;
} extra_languages_t;

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/**
 * ES format definition
 */
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struct es_format_t
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{
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    int             i_cat;              /**< ES category @see es_format_category_e */
    vlc_fourcc_t    i_codec;            /**< FOURCC value as used in vlc */
    vlc_fourcc_t    i_original_fourcc;  /**< original FOURCC from the container */
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    int             i_id;       /**< es identifier, where means
                                    -1: let the core mark the right id
                                    >=0: valid id */
    int             i_group;    /**< group identifier, where means:
                                    -1 : standalone
                                    >= 0 then a "group" (program) is created
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                                        for each value */
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    int             i_priority; /**< priority, where means:
                                    -2 : mean not selectable by the users
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                                    -1 : mean not selected by default even
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                                         when no other stream
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                                    >=0: priority */
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    char            *psz_language;        /**< human readible language name */
    char            *psz_description;     /**< human readible description of language */
    int             i_extra_languages;    /**< length in bytes of extra language data pointer */
    extra_languages_t *p_extra_languages; /**< extra language data needed by some decoders */
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    audio_format_t  audio;    /**< description of audio format */
    audio_replay_gain_t audio_replay_gain; /*< audio replay gain information */
    video_format_t video;     /**< description of video format */
    subs_format_t  subs;      /**< description of subtitle format */
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    unsigned int   i_bitrate; /**< bitrate of this ES */
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    bool     b_packetized;  /**< wether the data is packetized (ie. not truncated) */
    int     i_extra;        /**< length in bytes of extra data pointer */
    void    *p_extra;       /**< extra data needed by some decoders or muxers */
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};
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/** ES Categories */
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enum es_format_category_e
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{
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    UNKNOWN_ES = 0x00,
    VIDEO_ES   = 0x01,
    AUDIO_ES   = 0x02,
    SPU_ES     = 0x03,
    NAV_ES     = 0x04,
};
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/**
 * This function will fill all RGB shift from RGB masks.
 */
VLC_EXPORT( void, video_format_FixRgb, ( video_format_t * ) );
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/**
 * This funtion will initialize a es_format_t structure.
 */
VLC_EXPORT( void, es_format_Init, ( es_format_t *, int i_cat, vlc_fourcc_t i_codec ) );
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/**
 * This functions will copy a es_format_t.
 */
VLC_EXPORT( int, es_format_Copy, ( es_format_t *p_dst, const es_format_t *p_src ) );
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/**
 * This function will clean up a es_format_t and relasing all associated
 * resources.
 * You can call it multiple times on the same structure.
 */
VLC_EXPORT( void, es_format_Clean, ( es_format_t *fmt ) );
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/**
 * This function will check if the first ES format is similar
 * to the second one.
 *
 * All descriptive fields are ignored.
 */
VLC_EXPORT( bool, es_format_IsSimilar, ( const es_format_t *, const es_format_t * ) );

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#endif