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Diffstat (limited to 'pjsip-apps/src/samples/latency.c')
| -rw-r--r-- | pjsip-apps/src/samples/latency.c | 202 |
1 files changed, 202 insertions, 0 deletions
diff --git a/pjsip-apps/src/samples/latency.c b/pjsip-apps/src/samples/latency.c new file mode 100644 index 0000000..6193e61 --- /dev/null +++ b/pjsip-apps/src/samples/latency.c @@ -0,0 +1,202 @@ +/* $Id: latency.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 + */ + +/* See http://trac.pjsip.org/repos/wiki/MeasuringSoundLatency on + * how to use this program. + */ + +#include <pjmedia.h> +#include <pjlib.h> + +#include <stdio.h> + +#define THIS_FILE "lacency.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; +} + +/* + * Find out latency + */ +static int calculate_latency(pj_pool_t *pool, pjmedia_port *wav) +{ + pjmedia_frame frm; + short *buf; + unsigned i, samples_per_frame, read, len; + unsigned start_pos; + pj_status_t status; + + unsigned lat_sum = 0, + lat_cnt = 0, + lat_min = 10000, + lat_max = 0; + + samples_per_frame = PJMEDIA_PIA_SPF(&wav->info); + frm.buf = pj_pool_alloc(pool, samples_per_frame * 2); + frm.size = samples_per_frame * 2; + len = pjmedia_wav_player_get_len(wav); + buf = pj_pool_alloc(pool, len + samples_per_frame); + + read = 0; + while (read < len/2) { + status = pjmedia_port_get_frame(wav, &frm); + if (status != PJ_SUCCESS) + break; + + pjmedia_copy_samples(buf+read, (short*)frm.buf, samples_per_frame); + read += samples_per_frame; + } + + if (read < 2 * PJMEDIA_PIA_SRATE(&wav->info)) { + puts("Error: too short"); + return -1; + } + + start_pos = 0; + while (start_pos < len/2 - PJMEDIA_PIA_SRATE(&wav->info)) { + int max_signal = 0; + unsigned max_signal_pos = start_pos; + unsigned max_echo_pos = 0; + unsigned pos; + unsigned lat; + + /* Get the largest signal in the next 0.7s */ + for (i=start_pos; i<start_pos + PJMEDIA_PIA_SRATE(&wav->info) * 700 / 1000; ++i) { + if (abs(buf[i]) > max_signal) { + max_signal = abs(buf[i]); + max_signal_pos = i; + } + } + + /* Advance 10ms from max_signal_pos */ + pos = max_signal_pos + 10 * PJMEDIA_PIA_SRATE(&wav->info) / 1000; + + /* Get the largest signal in the next 500ms */ + max_signal = 0; + max_echo_pos = pos; + for (i=pos; i<pos+PJMEDIA_PIA_SRATE(&wav->info)/2; ++i) { + if (abs(buf[i]) > max_signal) { + max_signal = abs(buf[i]); + max_echo_pos = i; + } + } + + lat = (max_echo_pos - max_signal_pos) * 1000 / PJMEDIA_PIA_SRATE(&wav->info); + +#if 0 + printf("Latency = %u\n", lat); +#endif + + lat_sum += lat; + lat_cnt++; + if (lat < lat_min) + lat_min = lat; + if (lat > lat_max) + lat_max = lat; + + /* Advance next loop */ + start_pos += PJMEDIA_PIA_SRATE(&wav->info); + } + + printf("Latency average = %u\n", lat_sum / lat_cnt); + printf("Latency minimum = %u\n", lat_min); + printf("Latency maximum = %u\n", lat_max); + printf("Number of data = %u\n", lat_cnt); + return 0; +} + + +/* + * main() + */ +int main(int argc, char *argv[]) +{ + enum { NSAMPLES = 160, COUNT=100 }; + pj_caching_pool cp; + pj_pool_t *pool; + pjmedia_port *wav; + pj_status_t status; + + + /* Verify cmd line arguments. */ + if (argc != 2) { + puts("Error: missing argument(s)"); + puts("Usage: latency REV.WAV"); + return 1; + } + + pj_log_set_level(0); + + status = pj_init(); + PJ_ASSERT_RETURN(status == PJ_SUCCESS, 1); + + pj_caching_pool_init(&cp, &pj_pool_factory_default_policy, 0); + + pool = pj_pool_create( &cp.factory, /* pool factory */ + "wav", /* pool name. */ + 4000, /* init size */ + 4000, /* increment size */ + NULL /* callback on error */ + ); + + status = pj_register_strerror(PJMEDIA_ERRNO_START, PJ_ERRNO_SPACE_SIZE, + &pjmedia_strerror); + pj_assert(status == PJ_SUCCESS); + + /* Wav */ + status = pjmedia_wav_player_port_create( pool, /* memory pool */ + argv[1], /* file to play */ + 0, /* use default ptime*/ + 0, /* flags */ + 0, /* default buffer */ + &wav /* returned port */ + ); + if (status != PJ_SUCCESS) { + app_perror(THIS_FILE, argv[1], status); + return 1; + } + + status = calculate_latency(pool, wav); + if (status != PJ_SUCCESS) + return 1; + + status = pjmedia_port_destroy( wav ); + PJ_ASSERT_RETURN(status == PJ_SUCCESS, 1); + + pj_pool_release( pool ); + pj_caching_pool_destroy( &cp ); + pj_shutdown(); + + /* Done. */ + return 0; +} + |