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/* $Id: level.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_level_c Samples: Reading from WAV File
*
* This is a very simple example to use the @ref PJMEDIA_FILE_PLAY, to
* directly read the samples from the file.
*
* This file is pjsip-apps/src/samples/level.c
*
* \includelineno level.c
*/
static const char *desc =
" FILE: \n"
" level.c \n"
" \n"
" PURPOSE: \n"
" Read PCM WAV file and display the audio level the first 100 frames. \n"
" Each frame is assumed to have 160 samples. \n"
" \n"
" USAGE: \n"
" level file.wav \n"
" \n"
" The WAV file SHOULD have a 16bit mono samples. ";
#include <pjmedia.h>
#include <pjlib.h>
#include <stdio.h>
/* For logging purpose. */
#define THIS_FILE "level.c"
/* Util to display the error message for the specified error code */
static int app_perror( const char *sender, const char *title,
pj_status_t status)
{
char errmsg[PJ_ERR_MSG_SIZE];
PJ_UNUSED_ARG(sender);
pj_strerror(status, errmsg, sizeof(errmsg));
printf("%s: %s [code=%d]\n", title, errmsg, status);
return 1;
}
/*
* main()
*/
int main(int argc, char *argv[])
{
enum { NSAMPLES = 640, COUNT=100 };
pj_caching_pool cp;
pjmedia_endpt *med_endpt;
pj_pool_t *pool;
pjmedia_port *file_port;
int i;
pj_status_t status;
/* Verify cmd line arguments. */
if (argc != 2) {
puts("");
puts(desc);
return 1;
}
/* Must init PJLIB first: */
status = pj_init();
PJ_ASSERT_RETURN(status == PJ_SUCCESS, 1);
/* Must create a pool factory before we can allocate any memory. */
pj_caching_pool_init(&cp, &pj_pool_factory_default_policy, 0);
/*
* Initialize media endpoint.
* This will implicitly initialize PJMEDIA too.
*/
status = pjmedia_endpt_create(&cp.factory, NULL, 1, &med_endpt);
PJ_ASSERT_RETURN(status == PJ_SUCCESS, 1);
/* Create memory pool for our file player */
pool = pj_pool_create( &cp.factory, /* pool factory */
"wav", /* pool name. */
4000, /* init size */
4000, /* increment size */
NULL /* callback on error */
);
/* Create file media port from the WAV file */
status = pjmedia_wav_player_port_create( pool, /* memory pool */
argv[1], /* file to play */
0, /* use default ptime*/
0, /* flags */
0, /* default buffer */
&file_port/* returned port */
);
if (status != PJ_SUCCESS) {
app_perror(THIS_FILE, "Unable to use WAV file", status);
return 1;
}
if (PJMEDIA_PIA_SPF(&file_port->info) > NSAMPLES) {
app_perror(THIS_FILE, "WAV clock rate is too big", PJ_EINVAL);
return 1;
}
puts("Time\tPCMU\tLinear");
puts("------------------------");
for (i=0; i<COUNT; ++i) {
pj_int16_t framebuf[NSAMPLES];
pjmedia_frame frm;
pj_int32_t level32;
unsigned ms;
int level;
frm.buf = framebuf;
frm.size = sizeof(framebuf);
pjmedia_port_get_frame(file_port, &frm);
level32 = pjmedia_calc_avg_signal(framebuf,
PJMEDIA_PIA_SPF(&file_port->info));
level = pjmedia_linear2ulaw(level32) ^ 0xFF;
ms = i * 1000 * PJMEDIA_PIA_SPF(&file_port->info) /
PJMEDIA_PIA_SRATE(&file_port->info);
printf("%03d.%03d\t%7d\t%7d\n",
ms/1000, ms%1000, level, level32);
}
puts("");
/* Destroy file port */
status = pjmedia_port_destroy( file_port );
PJ_ASSERT_RETURN(status == PJ_SUCCESS, 1);
/* Release application pool */
pj_pool_release( pool );
/* Destroy media endpoint. */
pjmedia_endpt_destroy( med_endpt );
/* Destroy pool factory */
pj_caching_pool_destroy( &cp );
/* Shutdown PJLIB */
pj_shutdown();
/* Done. */
return 0;
}
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