From b865a833342a8d34ee6ff7d216e364cc5cc55388 Mon Sep 17 00:00:00 2001
From: Benny Prijono <bennylp@teluu.com>
Date: Sat, 12 Jan 2008 11:31:39 +0000
Subject: Ticket #446: Added sample application to mix WAV files using
 conference bridge

git-svn-id: http://svn.pjsip.org/repos/pjproject/trunk@1682 74dad513-b988-da41-8d7b-12977e46ad98
---
 pjsip-apps/src/samples/mix.c | 215 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 215 insertions(+)
 create mode 100644 pjsip-apps/src/samples/mix.c

diff --git a/pjsip-apps/src/samples/mix.c b/pjsip-apps/src/samples/mix.c
new file mode 100644
index 00000000..c690d7e5
--- /dev/null
+++ b/pjsip-apps/src/samples/mix.c
@@ -0,0 +1,215 @@
+/* $Id$ */
+/* 
+ * Copyright (C) 2003-2007 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 
+ */
+
+ /**
+ * \page page_pjmedia_samples_mix_c Samples: Mixing WAV files
+ *
+ * This file is pjsip-apps/src/samples/mix.c
+ *
+ * \includelineno mix.c
+ */
+
+#include <pjlib.h>
+#include <pjlib-util.h>
+#include <pjmedia.h>
+
+#define THIS_FILE   "mix.c"
+
+static const char *desc = 
+ " mix\n"
+ "\n"
+ " PURPOSE:\n"
+ "  Mix input WAV files and save it to output WAV. Input WAV can have\n"
+ "  different clock rate.\n"
+ "\n"
+ "\n"
+ " USAGE:\n"
+ "  mix [options] output.wav input1.wav [input2.wav] ...\n"
+ "\n"
+ " arguments:\n"
+ "    output.wav    Set the output WAV filename.\n"
+ "    input1.wav    Set the input WAV filename.\n"
+ "    input2.wav    Set the input WAV filename.\n"
+ "\n"
+ " options:\n"
+ "    -c N          Set clock rate to N Hz (default 16000)\n"
+;
+
+#define MAX_WAV	    16
+#define PTIME	    20
+
+struct wav_input
+{
+    const char	    *fname;
+    pjmedia_port    *port;
+    unsigned	     slot;
+};
+
+static int err_ret(const char *title, pj_status_t status)
+{
+    char errmsg[PJ_ERR_MSG_SIZE];
+    pj_strerror(status, errmsg, sizeof(errmsg));
+    PJ_LOG(3,(THIS_FILE, "%s error: %s", title, errmsg));
+    return 1;
+}
+
+int main(int argc, char *argv[])
+{
+    pj_caching_pool cp;
+    pj_pool_t *pool;
+    pjmedia_endpt *med_ept;
+    unsigned clock_rate = 16000;
+    int c;
+    const char *out_fname;
+    pjmedia_conf *conf;
+    pjmedia_port *wavout;
+    struct wav_input wav_input[MAX_WAV];
+    pj_ssize_t longest = 0, processed;
+    unsigned i, input_cnt = 0;
+    pj_status_t status;
+
+#define CHECK(op)   do { \
+			status = op; \
+			if (status != PJ_SUCCESS) \
+			    return err_ret(#op, status); \
+		    } while (0)
+
+
+    /* Parse arguments */
+    while ((c=pj_getopt(argc, argv, "c:")) != -1) {
+	switch (c) {
+	case 'c':
+	    clock_rate = atoi(pj_optarg);
+	    if (clock_rate < 1000) {
+		puts("Error: invalid clock rate");
+		return -1;
+	    }
+	    break;
+	}
+    }
+
+    /* Get output WAV name */
+    if (pj_optind == argc) {
+	puts("Error: no WAV output is specified");
+	return 1;
+    }
+
+    out_fname = argv[pj_optind++];
+    if (pj_file_exists(out_fname)) {
+	char in[8];
+
+	printf("File %s exists, overwrite? [Y/N] ", out_fname);
+	fflush(stdout);
+	fgets(in, sizeof(in), stdin);
+	if (pj_tolower(in[0]) != 'y')
+	    return 1;
+    }
+
+    /* Scan input file names */
+    for (input_cnt=0 ; pj_optind<argc && input_cnt<MAX_WAV; 
+	 ++pj_optind, ++input_cnt) 
+    {
+	if (!pj_file_exists(argv[pj_optind])) {
+	    printf("Error: input file %s doesn't exist\n",
+		   argv[pj_optind]);
+	    return 1;
+	}
+	wav_input[input_cnt].fname = argv[pj_optind];
+	wav_input[input_cnt].port = NULL;
+	wav_input[input_cnt].slot = 0;
+    }
+
+    if (input_cnt == 0) {
+	puts("Error: no input WAV is specified");
+	return 0;
+    }
+
+    /* Initialialize */
+    CHECK( pj_init() );
+    CHECK( pjlib_util_init() );
+    pj_caching_pool_init(&cp, NULL, 0);
+    CHECK( pjmedia_endpt_create(&cp.factory, NULL, 1, &med_ept) );
+
+    pool = pj_pool_create(&cp.factory, "mix", 1000, 1000, NULL);
+
+    /* Create the bridge */
+    CHECK( pjmedia_conf_create(pool, MAX_WAV+4, clock_rate, 1, 
+			       clock_rate * PTIME / 1000, 16, 
+			       PJMEDIA_CONF_NO_DEVICE, &conf) );
+
+    /* Create the WAV output */
+    CHECK( pjmedia_wav_writer_port_create(pool, out_fname, clock_rate, 1,
+					  clock_rate * PTIME / 1000,
+					  16, 0, 0, &wavout) );
+
+    /* Create and register each WAV input to the bridge */
+    for (i=0; i<input_cnt; ++i) {
+	pj_ssize_t len;
+
+	CHECK( pjmedia_wav_player_port_create(pool, wav_input[i].fname, 20,
+					      PJMEDIA_FILE_NO_LOOP, 0, 
+					      &wav_input[i].port) );
+	len = pjmedia_wav_player_get_len(wav_input[i].port);
+	len = len * clock_rate / wav_input[i].port->info.clock_rate;
+	if (len > longest)
+	    longest = len;
+
+	CHECK( pjmedia_conf_add_port(conf, pool, wav_input[i].port,
+				     NULL, &wav_input[i].slot));
+
+	CHECK( pjmedia_conf_connect_port(conf, wav_input[i].slot, 0, 0) );
+    }
+
+    /* Loop reading frame from the bridge and write it to WAV */
+    processed = 0;
+    while (processed < longest) {
+	pj_int16_t framebuf[PTIME * 48000 / 1000];
+	pjmedia_port *cp = pjmedia_conf_get_master_port(conf);
+	pjmedia_frame frame;
+
+	frame.buf = framebuf;
+	frame.size = cp->info.samples_per_frame * 2;
+	pj_assert(frame.size <= sizeof(framebuf));
+	
+	status = pjmedia_port_get_frame(cp, &frame);
+	if (status != PJ_SUCCESS)
+	    break;
+
+	CHECK( pjmedia_port_put_frame(wavout, &frame));
+
+	processed += frame.size;
+    }
+
+    /* Shutdown everything */
+    CHECK( pjmedia_port_destroy(wavout) );
+    for (i=0; i<input_cnt; ++i) {
+	CHECK( pjmedia_conf_remove_port(conf, wav_input[i].slot) );
+	CHECK( pjmedia_port_destroy(wav_input[i].port) );
+    }
+
+    CHECK(pjmedia_conf_destroy(conf));
+    CHECK(pjmedia_endpt_destroy(med_ept));
+
+    pj_pool_release(pool);
+    pj_caching_pool_destroy(&cp);
+    pj_shutdown();
+
+    return 0;
+}
+
-- 
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