| /* $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; |
| } |
| |