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Diffstat (limited to 'pjsip-apps/src/samples/playsine.c')
| -rw-r--r-- | pjsip-apps/src/samples/playsine.c | 317 |
1 files changed, 317 insertions, 0 deletions
diff --git a/pjsip-apps/src/samples/playsine.c b/pjsip-apps/src/samples/playsine.c new file mode 100644 index 0000000..bab0c9b --- /dev/null +++ b/pjsip-apps/src/samples/playsine.c @@ -0,0 +1,317 @@ +/* $Id: playsine.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_playsine_c Samples: Using Custom Ports (Sine Wave Generator) + * + * This example demonstrate how to create a custom media port (in this case, a + * sine wave generator) and connect it to the sound device. + * + * This file is pjsip-apps/src/samples/playsine.c + * + * \includelineno playsine.c + */ + +/* + * playsine.c + * + * PURPOSE: + * Demonstrate how to create and use custom media port which + * simply feed a sine wav to the sound player. + * + * USAGE: + * playsine [nchannel] + * + * where: + * nchannel is 1 for mono (this is the default) or 2 for stereo. + */ + +#include <pjmedia.h> +#include <pjlib.h> + +#include <stdlib.h> /* atoi() */ +#include <stdio.h> +#include <math.h> /* sin() */ + +/* For logging purpose. */ +#define THIS_FILE "playsine.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; +} + + +/* Struct attached to sine generator */ +typedef struct +{ + pj_int16_t *samples; /* Sine samples. */ +} port_data; + + +/* This callback is called to feed more samples */ +static pj_status_t sine_get_frame( pjmedia_port *port, + pjmedia_frame *frame) +{ + port_data *sine = port->port_data.pdata; + pj_int16_t *samples = frame->buf; + unsigned i, count, left, right; + + /* Get number of samples */ + count = frame->size / 2 / PJMEDIA_PIA_CCNT(&port->info); + + left = 0; + right = 0; + + for (i=0; i<count; ++i) { + *samples++ = sine->samples[left]; + ++left; + + if (PJMEDIA_PIA_CCNT(&port->info) == 2) { + *samples++ = sine->samples[right]; + right += 2; /* higher pitch so we can distinguish left and right. */ + if (right >= count) + right = 0; + } + } + + /* Must set frame->type correctly, otherwise the sound device + * will refuse to play. + */ + frame->type = PJMEDIA_FRAME_TYPE_AUDIO; + + return PJ_SUCCESS; +} + +#ifndef M_PI +#define M_PI (3.14159265) +#endif + +/* + * Create a media port to generate sine wave samples. + */ +static pj_status_t create_sine_port(pj_pool_t *pool, + unsigned sampling_rate, + unsigned channel_count, + pjmedia_port **p_port) +{ + pjmedia_port *port; + unsigned i; + unsigned count; + pj_str_t name; + port_data *sine; + + PJ_ASSERT_RETURN(pool && channel_count > 0 && channel_count <= 2, + PJ_EINVAL); + + port = pj_pool_zalloc(pool, sizeof(pjmedia_port)); + PJ_ASSERT_RETURN(port != NULL, PJ_ENOMEM); + + /* Fill in port info. */ + name = pj_str("sine generator"); + pjmedia_port_info_init(&port->info, &name, + PJMEDIA_SIG_CLASS_PORT_AUD('s', 'i'), + sampling_rate, + channel_count, + 16, sampling_rate * 20 / 1000 * channel_count); + + /* Set the function to feed frame */ + port->get_frame = &sine_get_frame; + + /* Create sine port data */ + port->port_data.pdata = sine = pj_pool_zalloc(pool, sizeof(port_data)); + + /* Create samples */ + count = PJMEDIA_PIA_SPF(&port->info) / channel_count; + sine->samples = pj_pool_alloc(pool, count * sizeof(pj_int16_t)); + PJ_ASSERT_RETURN(sine->samples != NULL, PJ_ENOMEM); + + /* initialise sinusoidal wavetable */ + for( i=0; i<count; i++ ) + { + sine->samples[i] = (pj_int16_t) (10000.0 * + sin(((double)i/(double)count) * M_PI * 8.) ); + } + + *p_port = port; + + return PJ_SUCCESS; +} + + +/* Show usage */ +static void usage(void) +{ + puts(""); + puts("Usage: playsine [nchannel]"); + puts(""); + puts("where"); + puts(" nchannel is number of audio channels (1 for mono, or 2 for stereo)."); + puts(" Default is 1 (mono)."); + puts(""); +} + + +/* + * main() + */ +int main(int argc, char *argv[]) +{ + pj_caching_pool cp; + pjmedia_endpt *med_endpt; + pj_pool_t *pool; + pjmedia_port *sine_port; + pjmedia_snd_port *snd_port; + char tmp[10]; + int channel_count = 1; + pj_status_t status; + + if (argc == 2) { + channel_count = atoi(argv[1]); + if (channel_count < 1 || channel_count > 2) { + puts("Error: invalid arguments"); + usage(); + 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 sine generator */ + pool = pj_pool_create( &cp.factory, /* pool factory */ + "wav", /* pool name. */ + 4000, /* init size */ + 4000, /* increment size */ + NULL /* callback on error */ + ); + + /* Create a media port to generate sine wave samples. */ + status = create_sine_port( pool, /* memory pool */ + 11025, /* sampling rate */ + channel_count,/* # of channels */ + &sine_port /* returned port */ + ); + if (status != PJ_SUCCESS) { + app_perror(THIS_FILE, "Unable to create sine port", status); + return 1; + } + + /* Create sound player port. */ + status = pjmedia_snd_port_create_player( + pool, /* pool */ + -1, /* use default dev. */ + PJMEDIA_PIA_SRATE(&sine_port->info),/* clock rate. */ + PJMEDIA_PIA_CCNT(&sine_port->info),/* # of channels. */ + PJMEDIA_PIA_SPF(&sine_port->info), /* samples per frame. */ + PJMEDIA_PIA_BITS(&sine_port->info),/* bits per sample. */ + 0, /* options */ + &snd_port /* returned port */ + ); + if (status != PJ_SUCCESS) { + app_perror(THIS_FILE, "Unable to open sound device", status); + return 1; + } + + /* Connect sine generator port to the sound player + * Stream playing will commence immediately. + */ + status = pjmedia_snd_port_connect( snd_port, sine_port); + PJ_ASSERT_RETURN(status == PJ_SUCCESS, 1); + + + + /* + * Audio should be playing in a loop now, using sound device's thread. + */ + + + /* Sleep to allow log messages to flush */ + pj_thread_sleep(100); + + + puts("Playing sine wave.."); + puts(""); + puts("Press <ENTER> to stop playing and quit"); + + if (fgets(tmp, sizeof(tmp), stdin) == NULL) { + puts("EOF while reading stdin, will quit now.."); + } + + + /* Start deinitialization: */ + + /* Disconnect sound port from file port */ + status = pjmedia_snd_port_disconnect(snd_port); + PJ_ASSERT_RETURN(status == PJ_SUCCESS, 1); + + /* Without this sleep, Windows/DirectSound will repeteadly + * play the last frame during destroy. + */ + pj_thread_sleep(100); + + /* Destroy sound device */ + status = pjmedia_snd_port_destroy( snd_port ); + PJ_ASSERT_RETURN(status == PJ_SUCCESS, 1); + + + /* Destroy sine generator */ + status = pjmedia_port_destroy( sine_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; +} |