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74 lines
3.3 KiB
74 lines
3.3 KiB
/*
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The mediastreamer library aims at providing modular media processing and I/O
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for linphone, but also for any telephony application.
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Copyright (C) 2001 Simon MORLAT simon.morlat@linphone.org
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifdef HAVE_GLIB
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#include <glib.h>
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#else
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#include "glist.h"
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#endif
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#include "msbuffer.h"
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typedef struct _MSFifo
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{
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gint r_gran; /*maximum granularity for reading*/
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gint w_gran; /*maximum granularity for writing*/
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gchar * rd_ptr; /* read pointer on the position where there is something to read on the MSBuffer */
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guint32 readsize;
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gchar * wr_ptr;
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gchar * prev_wr_ptr;
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guint32 writesize; /* write pointer on the position where it is possible to write on the MSBuffer */
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gchar * begin; /* rd_ptr et wr_ptr must all be >=begin*/
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guint32 size; /* the length of the fifo, but this may not be equal to buffer->size*/
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guint32 saved_offset;
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gchar * pre_end; /* the end of the buffer that is copied at the begginning when we wrap around*/
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gchar * w_end; /* when a wr ptr is expected to exceed end_offset,
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it must be wrapped around to go at the beginning of the buffer. This is the end of the buffer*/
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gchar * r_end; /* this is the last position written at the end of the fifo. If a read ptr is expected to
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exceed this pointer, it must be put at the begginning of the buffer */
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void *prev_data; /*user data, usually the writing MSFilter*/
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void *next_data; /* user data, usually the reading MSFilter */
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MSBuffer *buffer;
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} MSFifo;
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/* constructor*/
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/* r_gran: max granularity for reading (in number of bytes)*/
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/* w_gran: max granularity for writing (in number of bytes)*/
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/* r_offset: number of bytes that are kept available behind read pointer (for recursive filters)*/
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/* w_offset: number of bytes that are kept available behind write pointer (for recursive filters)*/
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/* buf is a MSBuffer that should be compatible with the above parameter*/
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MSFifo * ms_fifo_new(MSBuffer *buf, gint r_gran, gint w_gran, gint r_offset, gint w_offset);
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/*does the same that ms_fifo_new(), but also allocate a compatible buffer automatically*/
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MSFifo * ms_fifo_new_with_buffer(gint r_gran, gint w_gran, gint r_offset, gint w_offset, gint min_buffer_size);
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void ms_fifo_destroy( MSFifo *fifo);
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void ms_fifo_destroy_with_buffer(MSFifo *fifo);
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/* get data to read */
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gint ms_fifo_get_read_ptr(MSFifo *fifo, gint bsize, void **ret_ptr);
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/* get a buffer to write*/
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gint ms_fifo_get_write_ptr(MSFifo *fifo, gint bsize, void **ret_ptr);
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/* in case the buffer got by ms_fifo_get_write_ptr() could not be filled completely, you must
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tell it by using this function */
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void ms_fifo_update_write_ptr(MSFifo *fifo, gint written);
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