* #36737: switch back to svn repo, remove assert in sip_transaction.c
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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_WSOLA_H__
+#define __PJMEDIA_WSOLA_H__
+
+/**
+ * @file wsola.h
+ * @brief Waveform Similarity Based Overlap-Add (WSOLA)
+ */
+#include <pjmedia/types.h>
+
+/**
+ * @defgroup PJMED_WSOLA Waveform Similarity Based Overlap-Add (WSOLA)
+ * @ingroup PJMEDIA_FRAME_OP
+ * @brief Time-scale modification to audio without affecting the pitch
+ * @{
+ *
+ * This section describes Waveform Similarity Based Overlap-Add (WSOLA)
+ * implementation in PJMEDIA. The WSOLA API here can be used both to
+ * compress (speed-up) and stretch (expand, slow down) audio playback
+ * without altering the pitch, or as a mean for performing packet loss
+ * concealment (WSOLA).
+ *
+ * The WSOLA implementation is used by \ref PJMED_DELAYBUF and \ref PJMED_PLC.
+ */
+
+PJ_BEGIN_DECL
+
+
+/**
+ * Opaque declaration for WSOLA structure.
+ */
+typedef struct pjmedia_wsola pjmedia_wsola;
+
+
+/**
+ * WSOLA options, can be combined with bitmask operation.
+ */
+enum pjmedia_wsola_option
+{
+ /**
+ * Disable Hanning window to conserve memory.
+ */
+ PJMEDIA_WSOLA_NO_HANNING = 1,
+
+ /**
+ * Specify that the WSOLA will not be used for PLC.
+ */
+ PJMEDIA_WSOLA_NO_PLC = 2,
+
+ /**
+ * Specify that the WSOLA will not be used to discard frames in
+ * non-contiguous buffer.
+ */
+ PJMEDIA_WSOLA_NO_DISCARD = 4,
+
+ /**
+ * Disable fade-in and fade-out feature in the transition between
+ * actual and synthetic frames in WSOLA. With fade feature enabled,
+ * WSOLA will only generate a limited number of synthetic frames
+ * (configurable with #pjmedia_wsola_set_max_expand()), fading out
+ * the volume on every more samples it generates, and when it reaches
+ * the limit it will only generate silence.
+ */
+ PJMEDIA_WSOLA_NO_FADING = 8
+};
+
+
+
+/**
+ * Create and initialize WSOLA.
+ *
+ * @param pool Pool to allocate memory for WSOLA.
+ * @param clock_rate Sampling rate of audio playback.
+ * @param samples_per_frame Number of samples per frame.
+ * @param channel_count Number of channels.
+ * @param options Option flags, bitmask combination of
+ * #pjmedia_wsola_option.
+ * @param p_wsola Pointer to receive WSOLA structure.
+ *
+ * @return PJ_SUCCESS or the appropriate error code.
+ */
+PJ_DECL(pj_status_t) pjmedia_wsola_create(pj_pool_t *pool,
+ unsigned clock_rate,
+ unsigned samples_per_frame,
+ unsigned channel_count,
+ unsigned options,
+ pjmedia_wsola **p_wsola);
+
+
+/**
+ * Specify maximum number of continuous synthetic frames that can be
+ * generated by WSOLA, in milliseconds. This option will only take
+ * effect if fading is not disabled via the option when the WSOLA
+ * session was created. Default value is PJMEDIA_WSOLA_MAX_EXPAND_MSEC
+ * (see also the documentation of PJMEDIA_WSOLA_MAX_EXPAND_MSEC for
+ * more information).
+ *
+ * @param wsola The WSOLA session
+ * @param msec The duration.
+ *
+ * @return PJ_SUCCESS normally.
+ */
+PJ_DECL(pj_status_t) pjmedia_wsola_set_max_expand(pjmedia_wsola *wsola,
+ unsigned msec);
+
+
+/**
+ * Destroy WSOLA.
+ *
+ * @param wsola WSOLA session.
+ *
+ * @return PJ_SUCCESS normally.
+ */
+PJ_DECL(pj_status_t) pjmedia_wsola_destroy(pjmedia_wsola *wsola);
+
+
+/**
+ * Reset the buffer contents of WSOLA.
+ *
+ * @param wsola WSOLA session.
+ * @param options Reset options, must be zero for now.
+ *
+ * @return PJ_SUCCESS normally.
+ */
+PJ_DECL(pj_status_t) pjmedia_wsola_reset(pjmedia_wsola *wsola,
+ unsigned options);
+
+
+/**
+ * Give one good frame to WSOLA to be kept as reference. Application
+ * must continuously give WSOLA good frames to keep its session up to
+ * date with current playback. Depending on the WSOLA implementation,
+ * this function may modify the content of the frame.
+ *
+ * @param wsola WSOLA session.
+ * @param frm The frame, which length must match the samples per
+ * frame setting of the WSOLA session.
+ * @param prev_lost If application previously generated a synthetic
+ * frame with #pjmedia_wsola_generate() before calling
+ * this function, specify whether that was because of
+ * packet lost. If so, set this parameter to PJ_TRUE
+ * to make WSOLA interpolate this frame with its buffer.
+ * Otherwise if this value is PJ_FALSE, WSOLA will
+ * just append this frame to the end of its buffer.
+ *
+ * @return PJ_SUCCESS normally.
+ */
+PJ_DECL(pj_status_t) pjmedia_wsola_save(pjmedia_wsola *wsola,
+ pj_int16_t frm[],
+ pj_bool_t prev_lost);
+
+/**
+ * Generate one synthetic frame from WSOLA.
+ *
+ * @param wsola WSOLA session.
+ * @param frm Buffer to receive the frame.
+ *
+ * @return PJ_SUCCESS normally.
+ */
+PJ_DECL(pj_status_t) pjmedia_wsola_generate(pjmedia_wsola *wsola,
+ pj_int16_t frm[]);
+
+
+/**
+ * Compress or compact the specified buffer by removing some audio samples
+ * from the buffer, without altering the pitch. For this function to work,
+ * total length of the buffer must be more than twice \a erase_cnt.
+ *
+ * @param wsola WSOLA session.
+ * @param buf1 Pointer to buffer.
+ * @param buf1_cnt Number of samples in the buffer.
+ * @param buf2 Pointer to second buffer, if the buffer is not
+ * contiguous. Otherwise this parameter must be NULL.
+ * @param buf2_cnt Number of samples in the second buffer, if the buffer
+ * is not contiguous. Otherwise this parameter should be
+ * zero.
+ * @param erase_cnt On input, specify the number of samples to be erased.
+ * This function may erase more or less than the requested
+ * number, and the actual number of samples erased will be
+ * given on this argument upon returning from the function.
+ *
+ * @return PJ_SUCCESS if some samples have been erased, PJ_ETOOSMALL
+ * if buffer is too small to be reduced, PJ_EINVAL if any
+ * of the parameters are not valid.
+ */
+PJ_DECL(pj_status_t) pjmedia_wsola_discard(pjmedia_wsola *wsola,
+ pj_int16_t buf1[],
+ unsigned buf1_cnt,
+ pj_int16_t buf2[],
+ unsigned buf2_cnt,
+ unsigned *erase_cnt);
+
+
+PJ_END_DECL
+
+/**
+ * @}
+ */
+
+#endif /* __PJMEDIA_WSOLA_H__ */
+