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/*
The mediastreamer library aims at providing modular media processing and I/O
for linphone, but also for any telephony application.
Copyright (C) 2001 Simon MORLAT simon.morlat@linphone.org
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifdef HAVE_GLIB
#include <glib.h>
#else
#include "glist.h"
#endif
#include "msbuffer.h"
typedef struct _MSFifo
{
gint r_gran; /*maximum granularity for reading*/
gint w_gran; /*maximum granularity for writing*/
gchar * rd_ptr; /* read pointer on the position where there is something to read on the MSBuffer */
guint32 readsize;
gchar * wr_ptr;
gchar * prev_wr_ptr;
guint32 writesize; /* write pointer on the position where it is possible to write on the MSBuffer */
gchar * begin; /* rd_ptr et wr_ptr must all be >=begin*/
guint32 size; /* the length of the fifo, but this may not be equal to buffer->size*/
guint32 saved_offset;
gchar * pre_end; /* the end of the buffer that is copied at the begginning when we wrap around*/
gchar * w_end; /* when a wr ptr is expected to exceed end_offset,
it must be wrapped around to go at the beginning of the buffer. This is the end of the buffer*/
gchar * r_end; /* this is the last position written at the end of the fifo. If a read ptr is expected to
exceed this pointer, it must be put at the begginning of the buffer */
void *prev_data; /*user data, usually the writing MSFilter*/
void *next_data; /* user data, usually the reading MSFilter */
MSBuffer *buffer;
} MSFifo;
/* constructor*/
/* r_gran: max granularity for reading (in number of bytes)*/
/* w_gran: max granularity for writing (in number of bytes)*/
/* r_offset: number of bytes that are kept available behind read pointer (for recursive filters)*/
/* w_offset: number of bytes that are kept available behind write pointer (for recursive filters)*/
/* buf is a MSBuffer that should be compatible with the above parameter*/
MSFifo * ms_fifo_new(MSBuffer *buf, gint r_gran, gint w_gran, gint r_offset, gint w_offset);
/*does the same that ms_fifo_new(), but also allocate a compatible buffer automatically*/
MSFifo * ms_fifo_new_with_buffer(gint r_gran, gint w_gran, gint r_offset, gint w_offset, gint min_buffer_size);
void ms_fifo_destroy( MSFifo *fifo);
void ms_fifo_destroy_with_buffer(MSFifo *fifo);
/* get data to read */
gint ms_fifo_get_read_ptr(MSFifo *fifo, gint bsize, void **ret_ptr);
/* get a buffer to write*/
gint ms_fifo_get_write_ptr(MSFifo *fifo, gint bsize, void **ret_ptr);
/* in case the buffer got by ms_fifo_get_write_ptr() could not be filled completely, you must
tell it by using this function */
void ms_fifo_update_write_ptr(MSFifo *fifo, gint written);
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