vlc_es.h
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上传日期:2009-03-27
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- /*****************************************************************************
- * vlc_es.h: Elementary stream formats descriptions
- *****************************************************************************
- * Copyright (C) 1999-2001 VideoLAN
- * $Id: vlc_es.h 9268 2004-11-10 13:01:48Z gbazin $
- *
- * 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
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
- *****************************************************************************/
- #ifndef _VLC_ES_H
- #define _VLC_ES_H 1
- /**
- * file
- * This file defines the elementary streams format types
- */
- /**
- * video palette data
- * see video_format_t
- * see subs_format_t
- */
- struct video_palette_t
- {
- int i_entries; /**< to keep the compatibility with ffmpeg's palette */
- uint8_t palette[256][4]; /**< 4-byte RGBA/YUVA palette */
- };
- /**
- * audio format description
- */
- struct audio_format_t
- {
- vlc_fourcc_t i_format; /**< audio format fourcc */
- unsigned int i_rate; /**< audio sample-rate */
- /* Describes the channels configuration of the samples (ie. number of
- * channels which are available in the buffer, and positions). */
- uint32_t i_physical_channels;
- /* Describes from which original channels, before downmixing, the
- * buffer is derived. */
- uint32_t i_original_channels;
- /* Optional - for A/52, SPDIF and DTS types : */
- /* Bytes used by one compressed frame, depends on bitrate. */
- unsigned int i_bytes_per_frame;
- /* Number of sampleframes contained in one compressed frame. */
- unsigned int i_frame_length;
- /* 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) */
- int i_channels;
- int i_blockalign;
- int i_bitspersample;
- };
- #ifdef WORDS_BIGENDIAN
- # define AUDIO_FMT_S16_NE VLC_FOURCC('s','1','6','b')
- # define AUDIO_FMT_U16_NE VLC_FOURCC('u','1','6','b')
- #else
- # define AUDIO_FMT_S16_NE VLC_FOURCC('s','1','6','l')
- # define AUDIO_FMT_U16_NE VLC_FOURCC('u','1','6','l')
- #endif
- /**
- * video format description
- */
- 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 */
- unsigned int i_sar_num; /**< sample/pixel aspect ratio */
- unsigned int i_sar_den;
- unsigned int i_frame_rate; /**< frame rate numerator */
- unsigned int i_frame_rate_base; /**< frame rate denominator */
- int i_rmask, i_gmask, i_bmask; /**< color masks for RGB chroma */
- video_palette_t *p_palette; /**< video palette from demuxer */
- };
- /**
- * subtitles format description
- */
- struct subs_format_t
- {
- /* the character encoding of the text of the subtitle.
- * all gettext recognized shorts can be used */
- char *psz_encoding;
- int i_x_origin; /**< x coordinate of the subtitle. 0 = left */
- int i_y_origin; /**< y coordinate of the subtitle. 0 = top */
- struct
- {
- /* */
- uint32_t palette[16+1];
- /* the width of the original movie the spu was extracted from */
- int i_original_frame_width;
- /* the height of the original movie the spu was extracted from */
- int i_original_frame_height;
- } spu;
- struct
- {
- int i_id;
- } dvb;
- };
- /**
- * ES definition
- */
- struct es_format_t
- {
- int i_cat;
- vlc_fourcc_t i_codec;
- int i_id; /* -1: let the core mark the right id
- >=0: valid id */
- int i_group; /* -1 : standalone
- >= 0 then a "group" (program) is created
- for each value */
- int i_priority; /* -2 : mean not selectable by the users
- -1 : mean not selected by default even
- when no other stream
- >=0: priority */
- char *psz_language;
- char *psz_description;
- audio_format_t audio;
- video_format_t video;
- subs_format_t subs;
- int i_bitrate;
- vlc_bool_t b_packetized; /* wether the data is packetized
- (ie. not truncated) */
- int i_extra;
- void *p_extra;
- };
- /* ES Categories */
- #define UNKNOWN_ES 0x00
- #define VIDEO_ES 0x01
- #define AUDIO_ES 0x02
- #define SPU_ES 0x03
- #define NAV_ES 0x04
- static inline void es_format_Init( es_format_t *fmt,
- int i_cat, vlc_fourcc_t i_codec )
- {
- fmt->i_cat = i_cat;
- fmt->i_codec = i_codec;
- fmt->i_id = -1;
- fmt->i_group = 0;
- fmt->i_priority = 0;
- fmt->psz_language = NULL;
- fmt->psz_description = NULL;
- memset( &fmt->audio, 0, sizeof(audio_format_t) );
- memset( &fmt->video, 0, sizeof(video_format_t) );
- memset( &fmt->subs, 0, sizeof(subs_format_t) );
- fmt->b_packetized = VLC_TRUE;
- fmt->i_bitrate = 0;
- fmt->i_extra = 0;
- fmt->p_extra = NULL;
- }
- static inline void es_format_Copy( es_format_t *dst, es_format_t *src )
- {
- memcpy( dst, src, sizeof( es_format_t ) );
- if( src->psz_language )
- dst->psz_language = strdup( src->psz_language );
- if( src->psz_description )
- dst->psz_description = strdup( src->psz_description );
- if( src->i_extra > 0 )
- {
- dst->i_extra = src->i_extra;
- dst->p_extra = malloc( src->i_extra );
- memcpy( dst->p_extra, src->p_extra, src->i_extra );
- }
- else
- {
- dst->i_extra = 0;
- dst->p_extra = NULL;
- }
- if( src->subs.psz_encoding )
- dst->subs.psz_encoding = strdup( src->subs.psz_encoding );
- if( src->video.p_palette )
- {
- dst->video.p_palette =
- (video_palette_t*)malloc( sizeof( video_palette_t ) );
- memcpy( dst->video.p_palette, src->video.p_palette,
- sizeof( video_palette_t ) );
- }
- }
- static inline void es_format_Clean( es_format_t *fmt )
- {
- if( fmt->psz_language ) free( fmt->psz_language );
- fmt->psz_language = NULL;
- if( fmt->psz_description ) free( fmt->psz_description );
- fmt->psz_description = NULL;
- if( fmt->i_extra > 0 ) free( fmt->p_extra );
- fmt->i_extra = 0; fmt->p_extra = NULL;
- if( fmt->video.p_palette ) free( fmt->video.p_palette );
- fmt->video.p_palette = NULL;
- if( fmt->subs.psz_encoding ) free( fmt->subs.psz_encoding );
- fmt->subs.psz_encoding = NULL;
- }
- #endif