dynamicoverlay_buffer.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:4k
源码类别:
midi
开发平台:
Unix_Linux
- /*****************************************************************************
- * dynamicoverlay_buffer.h : dynamic overlay buffer
- *****************************************************************************
- * Copyright (C) 2008-2009 the VideoLAN team
- * $Id: b454ebf5b8db04c9279b534fd61f04616c882f9a $
- *
- * Author: Søren Bøg <avacore@videolan.org>
- * Jean-Paul Saman <jpsaman@videolan.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.
- *****************************************************************************/
- #ifdef HAVE_CONFIG_H
- # include "config.h"
- #endif
- #include <vlc_common.h>
- #include <vlc_osd.h>
- #include <vlc_filter.h>
- #include <ctype.h>
- #include "dynamicoverlay.h"
- /*****************************************************************************
- * buffer_t: Command and response buffer
- *****************************************************************************/
- int BufferInit( buffer_t *p_buffer )
- {
- memset( p_buffer, 0, sizeof( buffer_t ) );
- p_buffer->p_memory = NULL;
- p_buffer->p_begin = NULL;
- return VLC_SUCCESS;
- }
- int BufferDestroy( buffer_t *p_buffer )
- {
- if( p_buffer->p_memory != NULL )
- {
- free( p_buffer->p_memory );
- }
- p_buffer->p_memory = NULL;
- p_buffer->p_begin = NULL;
- return VLC_SUCCESS;
- }
- char *BufferGetToken( buffer_t *p_buffer )
- {
- char *p_char = p_buffer->p_begin;
- while( isspace( p_char[0] ) || p_char[0] == ' ' )
- {
- if( p_char <= (p_buffer->p_begin + p_buffer->i_length) )
- p_char++;
- else
- return NULL;
- }
- return p_char;
- }
- int BufferAdd( buffer_t *p_buffer, const char *p_data, size_t i_len )
- {
- if( ( p_buffer->i_size - p_buffer->i_length -
- ( p_buffer->p_begin - p_buffer->p_memory ) ) < i_len )
- {
- /* We'll have to do some rearranging to fit the new data. */
- if( ( p_buffer->i_size - p_buffer->i_length ) >= i_len )
- {
- /* We have room in the current buffer, just need to move it */
- memmove( p_buffer->p_memory, p_buffer->p_begin,
- p_buffer->i_length );
- p_buffer->p_begin = p_buffer->p_memory;
- }
- else
- {
- // We need a bigger buffer
- size_t i_newsize = 1024;
- while( i_newsize < p_buffer->i_length + i_len )
- i_newsize *= 2;
- /* TODO: Should I handle wrapping here? */
- /* I'm not using realloc here, as I can avoid a memcpy/memmove in
- some (most?) cases, and reset the start of the buffer. */
- char *p_newdata = malloc( i_newsize );
- if( p_newdata == NULL )
- return VLC_ENOMEM;
- if( p_buffer->p_begin != NULL )
- {
- memcpy( p_newdata, p_buffer->p_begin, p_buffer->i_length );
- free( p_buffer->p_memory );
- }
- p_buffer->p_memory = p_buffer->p_begin = p_newdata;
- p_buffer->i_size = i_newsize;
- }
- }
- /* Add the new data to the end of the current */
- memcpy( p_buffer->p_begin + p_buffer->i_length, p_data, i_len );
- p_buffer->i_length += i_len;
- return VLC_SUCCESS;
- }
- int BufferPrintf( buffer_t *p_buffer, const char *p_fmt, ... )
- {
- int i_len;
- int status;
- char *psz_data;
- va_list va;
- va_start( va, p_fmt );
- i_len = vasprintf( &psz_data, p_fmt, va );
- va_end( va );
- if( i_len == -1 )
- return VLC_ENOMEM;
- status = BufferAdd( p_buffer, psz_data, i_len );
- free( psz_data );
- return status;
- }
- int BufferDel( buffer_t *p_buffer, int i_len )
- {
- p_buffer->i_length -= i_len;
- if( p_buffer->i_length == 0 )
- {
- /* No data, we can reset the buffer now. */
- p_buffer->p_begin = p_buffer->p_memory;
- }
- else
- {
- p_buffer->p_begin += i_len;
- }
- return VLC_SUCCESS;
- }