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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_STEREO_H__
+#define __PJMEDIA_STEREO_H__
+
+/**
+ * @file stereo.h
+ * @brief Monochannel and multichannel converter.
+ */
+
+#include <pjmedia/errno.h>
+#include <pjmedia/port.h>
+#include <pjmedia/types.h>
+#include <pj/assert.h>
+
+
+/**
+ * @defgroup PJMEDIA_STEREO Monochannel and multichannel audio frame converter
+ * @ingroup PJMEDIA_FRAME_OP
+ * @brief Mono - multi-channels audio conversion
+ * @{
+ *
+ */
+
+PJ_BEGIN_DECL
+
+
+/**
+ * Multichannel to monochannel conversion mixes samples from all channels
+ * into the monochannel.
+ */
+#define PJMEDIA_STEREO_MIX  PJ_TRUE
+
+
+
+/**
+ * Multichannel to monochannel conversion, it has two operation mode specified
+ * by param options, @see pjmedia_stereo_options. This function can work safely
+ * using the same buffer (in place conversion).
+ *
+ * @param mono		    Output buffer to store the mono frame extracted 
+ *			    from the multichannels frame.
+ * @param multi		    Input frame containing multichannels audio.
+ * @param channel_count	    Number of channels in the input frame.
+ * @param samples_per_frame Number of samples in the input frame.
+ * @param mix		    If the value is PJ_TRUE then the input channels 
+ *			    will be mixed to produce output frame, otherwise
+ *			    only frame from channel_src will be copied to the
+ *			    output frame.
+ * @param channel_src	    When mixing is disabled, the mono output frame
+ *			    will be copied from this channel number.
+ *
+ * @return		    PJ_SUCCESS on success;
+ */
+PJ_INLINE(pj_status_t) pjmedia_convert_channel_nto1(pj_int16_t mono[],
+						    const pj_int16_t multi[],
+						    unsigned channel_count,
+						    unsigned samples_per_frame,
+						    pj_bool_t mix,
+						    unsigned channel_src)
+{
+    unsigned i;
+
+    PJ_ASSERT_RETURN(mono && multi && channel_count && samples_per_frame &&
+		     channel_src < channel_count,  PJ_EINVAL);
+
+    if (mix==PJ_FALSE) {
+	for (i = channel_src; i < samples_per_frame; i += channel_count) {
+	    *mono = multi[i];
+	    ++mono;
+	}
+    } else {
+	unsigned j;
+	for (i = 0; i < samples_per_frame; i += channel_count) {
+	    int tmp = 0;
+	    for(j = 0; j < channel_count; ++j)
+		tmp += multi[i+j];
+
+	    if (tmp > 32767) tmp = 32767;
+	    else if (tmp < -32768) tmp = -32768;
+	    *mono = (pj_int16_t) tmp;
+	    ++mono;
+	}
+    }
+
+    return PJ_SUCCESS;
+}
+
+
+/**
+ * Monochannel to multichannel conversion, it will just duplicate the samples
+ * from monochannel frame to all channels in the multichannel frame. 
+ * This function can work safely using the same buffer (in place conversion)
+ * as long as the buffer is big enough for the multichannel samples.
+ *
+ * @param multi		    Output buffer to store the multichannels frame 
+ *			    mixed from the mono frame.
+ * @param mono		    The input monochannel audio frame.
+ * @param channel_count	    Desired number of channels in the output frame.
+ * @param samples_per_frame Number of samples in the input frame.
+ * @param options	    Options for conversion, currently must be zero.
+ *
+ * @return		    PJ_SUCCESS on success;
+ */
+PJ_INLINE(pj_status_t) pjmedia_convert_channel_1ton(pj_int16_t multi[],
+						    const pj_int16_t mono[],
+						    unsigned channel_count,
+						    unsigned samples_per_frame,
+						    unsigned options)
+{
+    const pj_int16_t *src;
+
+    PJ_ASSERT_RETURN(mono && multi && channel_count && samples_per_frame, 
+		     PJ_EINVAL);
+    PJ_ASSERT_RETURN(options == 0, PJ_EINVAL);
+
+    PJ_UNUSED_ARG(options);
+
+    src = mono + samples_per_frame - 1;
+    samples_per_frame *= channel_count;
+    while (samples_per_frame) {
+	unsigned i;
+	for (i=1; i<=channel_count; ++i)
+	    multi[samples_per_frame-i] = *src;
+	samples_per_frame -= channel_count;
+	--src;
+    }
+
+    return PJ_SUCCESS;
+}
+
+
+/** 
+ * Options for channel converter port. The #pjmedia_stereo_options is also
+ * valid for this port options.
+ */
+typedef enum pjmedia_stereo_port_options
+{
+    /**
+     * Specifies whether this port should not destroy downstream port when 
+     * this port is destroyed.
+     */
+    PJMEDIA_STEREO_DONT_DESTROY_DN  = 4
+} pjmedia_stereo_port_options;
+
+
+/**
+ * Create a mono-multi channel converter port. This creates a converter session,
+ * which will adjust the samples of audio frame to a different channel count
+ * when the port's get_frame() and put_frame() is called.
+ *
+ * When the port's get_frame() is called, this port will get a frame from 
+ * the downstream port and convert the frame to the target channel count before
+ * returning it to the caller.
+ *
+ * When the port's put_frame() is called, this port will convert the frame
+ * to the downstream port's channel count before giving the frame to the 
+ * downstream port.
+ *
+ * @param pool			Pool to allocate the structure and buffers.
+ * @param dn_port		The downstream port, which channel count is to
+ *				be converted to the target channel count.
+ * @param channel_count		This port channel count.
+ * @param options		Bitmask flags from #pjmedia_stereo_port_options
+ *				and also application may add PJMEDIA_STEREO_MIX
+ *				to mix channels.
+ *				When this flag is zero, the default behavior
+ *				is to use simple N-to-1 channel converter and 
+ *				to destroy downstream port when this port is 
+ *				destroyed.
+ * @param p_port		Pointer to receive the stereo port instance.
+ *
+ * @return PJ_SUCCESS on success.
+ */
+PJ_DECL(pj_status_t) pjmedia_stereo_port_create( pj_pool_t *pool,
+						 pjmedia_port *dn_port,
+						 unsigned channel_count,
+						 unsigned options,
+						 pjmedia_port **p_port );
+
+PJ_END_DECL
+
+/**
+ * @}
+ */
+
+
+#endif	/* __PJMEDIA_STEREO_H__ */
+