invmem.c
资源名称:vlc-1.0.5.zip [点击查看]
上传用户:kjfoods
上传日期:2020-07-06
资源大小:29949k
文件大小:8k
源码类别:
midi
开发平台:
Unix_Linux
- /*****************************************************************************
- * invmem_decoder.c: memory video driver for vlc
- *****************************************************************************
- * Copyright (C) 2008 the VideoLAN team
- * $Id: c1371b749368a1478c3244ffc02512887832fbe2 $
- *
- * Authors: Robert Paciorek <robert@opcode.eu.org> <http://opcode.eu.org/bercik>
- * based on:
- * - vmem video output module (Gildas Bazin <gbazin@videolan.org>)
- * - png video decodec module (Sam Hocevar <sam@zoy.org>)
- *
- * 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.
- *****************************************************************************/
- /*****************************************************************************
- * Preamble
- *****************************************************************************/
- #ifdef HAVE_CONFIG_H
- # include "config.h"
- #endif
- #include <vlc_common.h>
- #include <vlc_plugin.h>
- #include <vlc_codec.h>
- #include <vlc_image.h>
- #include <vlc_filter.h>
- /*****************************************************************************
- * Local prototypes
- *****************************************************************************/
- static int OpenDecoder ( vlc_object_t * );
- static void CloseDecoder ( vlc_object_t * );
- static picture_t *DecodeBlock ( decoder_t *, block_t ** );
- /*****************************************************************************
- * Module descriptor
- *****************************************************************************/
- #define T_WIDTH N_( "Width" )
- #define LT_WIDTH N_( "Video memory buffer width." )
- #define T_HEIGHT N_( "Height" )
- #define LT_HEIGHT N_( "Video memory buffer height." )
- #define T_LOCK N_( "Lock function" )
- #define LT_LOCK N_( "Address of the locking callback function. This "
- "function must return a valid memory address for use "
- "by the video renderer." )
- #define T_UNLOCK N_( "Unlock function" )
- #define LT_UNLOCK N_( "Address of the unlocking callback function" )
- #define T_DATA N_( "Callback data" )
- #define LT_DATA N_( "Data for the locking and unlocking functions" )
- #define INVMEM_HELP N_( "This module make possible making video stream from raw-image "
- "generating (to memory) from rendering program uses libvlc. "
- "To use this module from libvlc set --codec to invmem, "
- "set all --invmem-* options in vlc_argv an use "
- "libvlc_media_new(libvlc, "fake://", &ex);. "
- "Besides is simillar to vmem video output module." )
- vlc_module_begin()
- set_category( CAT_INPUT )
- set_subcategory( SUBCAT_INPUT_VCODEC )
- set_shortname( N_("Memory video decoder") )
- set_description( N_("Memory video decoder") )
- set_help( INVMEM_HELP )
- set_capability( "decoder", 50 )
- set_callbacks( OpenDecoder, CloseDecoder )
- add_shortcut( "invmem" )
- add_integer( "invmem-width", 0, NULL, T_WIDTH, LT_WIDTH, false )
- add_integer( "invmem-height", 0, NULL, T_HEIGHT, LT_HEIGHT, false )
- add_string( "invmem-lock", "0", NULL, T_LOCK, LT_LOCK, true )
- add_string( "invmem-unlock", "0", NULL, T_UNLOCK, LT_UNLOCK, true )
- add_string( "invmem-data", "0", NULL, T_DATA, LT_DATA, true )
- vlc_module_end()
- struct decoder_sys_t
- {
- void * (*pf_lock) (void *);
- void (*pf_unlock) (void *);
- void *p_data;
- int i_width;
- int i_height;
- int i_pitch;
- picture_t *p_pic;
- };
- /*****************************************************************************
- * OpenDecoder: probe the decoder and return score
- *****************************************************************************/
- static int OpenDecoder( vlc_object_t *p_this )
- {
- decoder_t *p_dec = (decoder_t*)p_this;
- decoder_sys_t *p_sys;
- char *psz_tmp;
- if( p_dec->fmt_in.i_codec != VLC_FOURCC('f','a','k','e'))
- {
- return VLC_EGENERIC;
- }
- /* Allocate the memory needed to store the decoder's structure */
- if( ( p_dec->p_sys = p_sys = malloc(sizeof(decoder_sys_t)) ) == NULL )
- return VLC_ENOMEM;
- // get parametrs
- p_sys->i_width = var_CreateGetInteger( p_this, "invmem-width" );
- p_sys->i_height = var_CreateGetInteger( p_this, "invmem-height" );
- if( p_sys->i_width == 0 || p_sys->i_height == 0 )
- {
- msg_Err( p_dec, "--invmem-width and --invmem-height must be > 0" );
- free( p_sys );
- return VLC_EGENERIC;
- }
- psz_tmp = var_CreateGetString( p_dec, "invmem-lock" );
- p_sys->pf_lock = (void * (*) (void *))(intptr_t)atoll( psz_tmp );
- free( psz_tmp );
- psz_tmp = var_CreateGetString( p_dec, "invmem-unlock" );
- p_sys->pf_unlock = (void (*) (void *))(intptr_t)atoll( psz_tmp );
- free( psz_tmp );
- psz_tmp = var_CreateGetString( p_dec, "invmem-data" );
- p_sys->p_data = (void *)(intptr_t)atoll( psz_tmp );
- free( psz_tmp );
- if( !p_sys->pf_lock || !p_sys->pf_unlock )
- {
- msg_Err( p_dec, "Invalid lock or unlock callbacks" );
- free( p_sys );
- return VLC_EGENERIC;
- }
- /* Set output properties */
- //p_dec->fmt_out.i_codec = VLC_FOURCC('R','G','B','A');
- p_dec->fmt_out.i_codec = VLC_FOURCC('R','V','2','4');
- p_dec->fmt_out.video.i_width = p_dec->p_sys->i_width;
- p_dec->fmt_out.video.i_height = p_dec->p_sys->i_height;
- p_dec->fmt_out.video.i_aspect = VOUT_ASPECT_FACTOR * p_dec->p_sys->i_width / p_dec->p_sys->i_height;
- p_dec->fmt_out.video.i_rmask = 0xff0000;
- p_dec->fmt_out.video.i_gmask = 0x00ff00;
- p_dec->fmt_out.video.i_bmask = 0x0000ff;
- p_dec->fmt_out.i_cat = VIDEO_ES;
- p_sys->i_pitch = p_sys->i_width*3 + p_sys->i_width%4;
- p_sys->p_pic = NULL;
- /* Set callbacks */
- p_dec->pf_decode_video = DecodeBlock;
- return VLC_SUCCESS;
- }
- /****************************************************************************
- * DecodeBlock: the whole thing
- ****************************************************************************
- * This function must be fed with a complete compressed frame.
- ****************************************************************************/
- static picture_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
- {
- decoder_sys_t *p_sys = p_dec->p_sys;
- block_t *p_block;
- if( !pp_block || !*pp_block ) return NULL;
- p_block = *pp_block;
- // create new picture
- if( p_sys->p_pic != NULL )
- picture_Release( p_sys->p_pic );
- p_sys->p_pic = decoder_NewPicture( p_dec );
- p_sys->p_pic->b_force = true;
- p_sys->p_pic->p->i_pitch = p_dec->p_sys->i_pitch;
- p_sys->p_pic->date = p_block->i_pts > 0 ? p_block->i_pts : p_block->i_dts;
- // lock input and copy to picture
- p_sys->p_pic->p->p_pixels = p_sys->pf_lock( p_dec->p_sys->p_data );
- // unlock input
- p_sys->pf_unlock( p_dec->p_sys->p_data );
- block_Release( *pp_block ); *pp_block = NULL;
- return p_sys->p_pic;
- }
- /*****************************************************************************
- * CloseDecoder: invmem decoder destruction
- *****************************************************************************/
- static void CloseDecoder( vlc_object_t *p_this )
- {
- decoder_t *p_dec = (decoder_t *)p_this;
- decoder_sys_t *p_sys = p_dec->p_sys;
- if( p_sys->p_pic != NULL )
- picture_Release( p_sys->p_pic );
- free( p_sys );
- }