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159 lines
3.0 KiB
159 lines
3.0 KiB
/*
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* buffer.c
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*
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* Copyright (C) Thomas Oestreich - June 2001
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*
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* This file is part of transcode, a video stream processing tool
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*
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* transcode is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* transcode 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 GNU Make; see the file COPYING. If not, write to
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* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include "buffer.h"
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#include <stdlib.h>
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#include <unistd.h>
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buffer_list_t *buffer_list_head;
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buffer_list_t *buffer_list_tail;
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buffer_list_t *buffer_register(int id)
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{
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/* objectives:
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===========
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register new buffer
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allocate space for new buffer and establish backward reference
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*/
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buffer_list_t *ptr;
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// retrive a valid pointer from the pool
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if((ptr = malloc(sizeof(buffer_list_t))) == NULL) return(NULL);
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if((ptr->data = (char *) malloc(MAX_PCM_BUFFER)) == NULL) return(NULL);
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ptr->status = BUFFER_EMPTY;
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ptr->next = NULL;
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ptr->prev = NULL;
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ptr->id = id;
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if(buffer_list_tail != NULL)
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{
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buffer_list_tail->next = ptr;
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ptr->prev = buffer_list_tail;
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}
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buffer_list_tail = ptr;
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/* first buffer registered must set buffer_list_head */
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if(buffer_list_head == NULL) buffer_list_head = ptr;
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return(ptr);
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}
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/* ------------------------------------------------------------------ */
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void buffer_remove(buffer_list_t *ptr)
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{
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/* objectives:
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===========
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remove buffer from chained list
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*/
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if(ptr == NULL) return; // do nothing if null pointer
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if(ptr->prev != NULL) (ptr->prev)->next = ptr->next;
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if(ptr->next != NULL) (ptr->next)->prev = ptr->prev;
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if(ptr == buffer_list_tail) buffer_list_tail = ptr->prev;
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if(ptr == buffer_list_head) buffer_list_head = ptr->next;
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// release valid pointer to pool
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ptr->status = BUFFER_EMPTY;
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free(ptr->data);
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free(ptr);
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ptr=NULL;
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}
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/* ------------------------------------------------------------------ */
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buffer_list_t *buffer_retrieve()
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{
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/* objectives:
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===========
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get pointer to next full buffer
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*/
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buffer_list_t *ptr;
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ptr = buffer_list_head;
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/* move along the chain and check for status */
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while(ptr != NULL)
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{
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if(ptr->status == BUFFER_READY)
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{
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return(ptr);
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}
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ptr = ptr->next;
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}
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return(NULL);
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}
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/*************************************************************************/
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/*
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* Local variables:
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* c-file-style: "stroustrup"
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* c-file-offsets: ((case-label . *) (statement-case-intro . *))
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* indent-tabs-mode: nil
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* End:
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*
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* vim: expandtab shiftwidth=4:
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*/
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