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+/* $Id$ */
+/* 
+ * Copyright (C) 2008-2011 Teluu Inc. (http://www.teluu.com)
+ * Copyright (C) 2003-2008 Benny Prijono <benny@prijono.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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA 
+ */
+
+#ifndef __PJMEDIA_DELAYBUF_H__
+#define __PJMEDIA_DELAYBUF_H__
+
+
+/**
+ * @file delaybuf.h
+ * @brief Delay Buffer.
+ */
+
+#include <pjmedia/types.h>
+
+/**
+ * @defgroup PJMED_DELAYBUF Adaptive Delay Buffer
+ * @ingroup PJMEDIA_FRAME_OP
+ * @brief Adaptive delay buffer with high-quality time-scale
+ * modification
+ * @{
+ *
+ * This section describes PJMEDIA's implementation of delay buffer.
+ * Delay buffer works quite similarly like a fixed jitter buffer, that
+ * is it will delay the frame retrieval by some interval so that caller
+ * will get continuous frame from the buffer. This can be useful when
+ * the put() and get() operations are not evenly interleaved, for example
+ * when caller performs burst of put() operations and then followed by
+ * burst of get() operations. With using this delay buffer, the buffer
+ * will put the burst frames into a buffer so that get() operations
+ * will always get a frame from the buffer (assuming that the number of
+ * get() and put() are matched).
+ *
+ * The buffer is adaptive, that is it continuously learns the optimal delay
+ * to be applied to the audio flow at run-time. Once the optimal delay has 
+ * been learned, the delay buffer will apply this delay to the audio flow,
+ * expanding or shrinking the audio samples as necessary when the actual
+ * audio samples in the buffer are too low or too high. It does this without
+ * distorting the audio quality of the audio, by using \a PJMED_WSOLA.
+ *
+ * The delay buffer is used in \ref PJMED_SND_PORT, \ref PJMEDIA_SPLITCOMB,
+ * and \ref PJMEDIA_CONF.
+ */
+
+PJ_BEGIN_DECL
+
+/** Opaque declaration for delay buffer. */
+typedef struct pjmedia_delay_buf pjmedia_delay_buf;
+
+/**
+ * Delay buffer options.
+ */
+typedef enum pjmedia_delay_buf_flag
+{
+    /**
+     * Use simple FIFO mechanism for the delay buffer, i.e.
+     * without WSOLA for expanding and shrinking audio samples.
+     */
+    PJMEDIA_DELAY_BUF_SIMPLE_FIFO = 1
+
+} pjmedia_delay_buf_flag;
+
+/**
+ * Create the delay buffer. Once the delay buffer is created, it will
+ * enter learning state unless the delay argument is specified, which
+ * in this case it will directly enter the running state.
+ *
+ * @param pool		    Pool where the delay buffer will be allocated
+ *			    from.
+ * @param name		    Optional name for the buffer for log 
+ *			    identification.
+ * @param clock_rate	    Number of samples processed per second.
+ * @param samples_per_frame Number of samples per frame.
+ * @param channel_count	    Number of channel per frame.
+ * @param max_delay	    Maximum number of delay to be accommodated,
+ *			    in ms, if this value is negative or less than 
+ *			    one frame time, default maximum delay used is
+ *			    400 ms.
+ * @param options	    Options. If PJMEDIA_DELAY_BUF_SIMPLE_FIFO is
+ *                          specified, then a simple FIFO mechanism
+ *			    will be used instead of the adaptive
+ *                          implementation (which uses WSOLA to expand
+ *                          or shrink audio samples).
+ *			    See #pjmedia_delay_buf_flag for other options.
+ * @param p_b		    Pointer to receive the delay buffer instance.
+ *
+ * @return		    PJ_SUCCESS if the delay buffer has been
+ *			    created successfully, otherwise the appropriate
+ *			    error will be returned.
+ */
+PJ_DECL(pj_status_t) pjmedia_delay_buf_create(pj_pool_t *pool,
+					      const char *name,
+					      unsigned clock_rate,
+					      unsigned samples_per_frame,
+					      unsigned channel_count,
+					      unsigned max_delay,
+					      unsigned options,
+					      pjmedia_delay_buf **p_b);
+
+/**
+ * Put one frame into the buffer.
+ *
+ * @param b		    The delay buffer.
+ * @param frame		    Frame to be put into the buffer. This frame
+ *			    must have samples_per_frame length.
+ *
+ * @return		    PJ_SUCCESS if frames can be put successfully.
+ *			    PJ_EPENDING if the buffer is still at learning
+ *			    state. PJ_ETOOMANY if the number of frames
+ *			    will exceed maximum delay level, which in this
+ *			    case the new frame will overwrite the oldest
+ *			    frame in the buffer.
+ */
+PJ_DECL(pj_status_t) pjmedia_delay_buf_put(pjmedia_delay_buf *b,
+					   pj_int16_t frame[]);
+
+/**
+ * Get one frame from the buffer.
+ *
+ * @param b		    The delay buffer.
+ * @param frame		    Buffer to receive the frame from the delay
+ *			    buffer.
+ *
+ * @return		    PJ_SUCCESS if frame has been copied successfully.
+ *			    PJ_EPENDING if no frame is available, either
+ *			    because the buffer is still at learning state or
+ *			    no buffer is available during running state.
+ *			    On non-successful return, the frame will be
+ *			    filled with zeroes.
+ */
+PJ_DECL(pj_status_t) pjmedia_delay_buf_get(pjmedia_delay_buf *b,
+					   pj_int16_t frame[]);
+
+/**
+ * Reset delay buffer. This will clear the buffer's content. But keep
+ * the learning result.
+ *
+ * @param b		    The delay buffer.
+ *
+ * @return		    PJ_SUCCESS on success or the appropriate error.
+ */
+PJ_DECL(pj_status_t) pjmedia_delay_buf_reset(pjmedia_delay_buf *b);
+
+/**
+ * Destroy delay buffer.
+ *
+ * @param b	    Delay buffer session.
+ *
+ * @return	    PJ_SUCCESS normally.
+ */
+PJ_DECL(pj_status_t) pjmedia_delay_buf_destroy(pjmedia_delay_buf *b);
+
+
+PJ_END_DECL
+
+/**
+ * @}
+ */
+
+#endif	/* __PJMEDIA_DELAYBUF_H__ */