/* $Id$ */ /* * Copyright (C) 2008-2011 Teluu Inc. (http://www.teluu.com) * Copyright (C) 2003-2008 Benny Prijono * * 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 #include #include /* atoi() */ #include #include /* 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, left, right; pj_size_t count; /* Get number of samples */ count = frame->size / 2 / PJMEDIA_PIA_CCNT(&port->info); left = 0; right = 0; for (i=0; isamples[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; isamples[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 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; }