| /* $Id: playsine.c 4537 2013-06-19 06:47:43Z riza $ */ |
| /* |
| * 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, 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; 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; |
| } |