/* $Id: level.c 974 2007-02-19 01:13:53Z bennylp $ *//*  * 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_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 = 160, 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;    }    for (i=0; i<COUNT; ++i) {	pj_int16_t framebuf[NSAMPLES];	pjmedia_frame frm;	pj_int32_t level32;	int level;	frm.buf = framebuf;	frm.size = sizeof(framebuf);		pjmedia_port_get_frame(file_port, &frm);	level32 = pjmedia_calc_avg_signal( framebuf, NSAMPLES );	level = pjmedia_linear2ulaw(level32) ^ 0xFF;	printf("%d ", level);    }    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;}