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+/* $Id: mix.c 3664 2011-07-19 03:42:28Z nanang $ */
+/*
+ * 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
+ */
+
+ /**
+ * \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"
+ " -f Force write (overwrite output without warning\n"
+;
+
+#define MAX_WAV 16
+#define PTIME 20
+#define APPEND 1000
+
+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;
+}
+
+static void usage(void)
+{
+ puts(desc);
+}
+
+int main(int argc, char *argv[])
+{
+ pj_caching_pool cp;
+ pj_pool_t *pool;
+ pjmedia_endpt *med_ept;
+ unsigned clock_rate = 16000;
+ int c, force=0;
+ const char *out_fname;
+ pjmedia_conf *conf;
+ pjmedia_port *wavout;
+ struct wav_input wav_input[MAX_WAV];
+ pj_size_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:f")) != -1) {
+ switch (c) {
+ case 'c':
+ clock_rate = atoi(pj_optarg);
+ if (clock_rate < 1000) {
+ puts("Error: invalid clock rate");
+ usage();
+ return -1;
+ }
+ break;
+ case 'f':
+ force = 1;
+ break;
+ }
+ }
+
+ /* Get output WAV name */
+ if (pj_optind == argc) {
+ puts("Error: no WAV output is specified");
+ usage();
+ return 1;
+ }
+
+ out_fname = argv[pj_optind++];
+ if (force==0 && pj_file_exists(out_fname)) {
+ char in[8];
+
+ printf("File %s exists, overwrite? [Y/N] ", out_fname);
+ fflush(stdout);
+ if (fgets(in, sizeof(in), stdin) == NULL)
+ return 1;
+ 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 = (pj_ssize_t)(len * 1.0 * clock_rate /
+ PJMEDIA_PIA_SRATE(&wav_input[i].port->info));
+ if (len > (pj_ssize_t)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 + clock_rate * APPEND * 2 / 1000) {
+ pj_int16_t framebuf[PTIME * 48000 / 1000];
+ pjmedia_port *cp = pjmedia_conf_get_master_port(conf);
+ pjmedia_frame frame;
+
+ frame.buf = framebuf;
+ frame.size = PJMEDIA_PIA_SPF(&cp->info) * 2;
+ pj_assert(frame.size <= sizeof(framebuf));
+
+ CHECK( pjmedia_port_get_frame(cp, &frame) );
+
+ if (frame.type != PJMEDIA_FRAME_TYPE_AUDIO) {
+ pj_bzero(frame.buf, frame.size);
+ frame.type = PJMEDIA_FRAME_TYPE_AUDIO;
+ }
+
+ CHECK( pjmedia_port_put_frame(wavout, &frame));
+
+ processed += frame.size;
+ }
+
+ PJ_LOG(3,(THIS_FILE, "Done. Output duration: %d.%03d",
+ (processed >> 2)/clock_rate,
+ ((processed >> 2)*1000/clock_rate) % 1000));
+
+ /* 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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