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Diffstat (limited to 'pjsip-apps/src/samples/level.c')
| -rw-r--r-- | pjsip-apps/src/samples/level.c | 179 |
1 files changed, 179 insertions, 0 deletions
diff --git a/pjsip-apps/src/samples/level.c b/pjsip-apps/src/samples/level.c new file mode 100644 index 0000000..59bbb96 --- /dev/null +++ b/pjsip-apps/src/samples/level.c @@ -0,0 +1,179 @@ +/* $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; +} + |