/*

* Asterisk -- An open source telephony toolkit.

*

* Copyright (C) 1999 - 2005, Digium, Inc.

*

* Mark Spencer <markster@digium.com>

*

* See http://www.asterisk.org for more information about

* the Asterisk project. Please do not directly contact

* any of the maintainers of this project for assistance;

* the project provides a web site, mailing lists and IRC

* channels for your use.

*

* This program is free software, distributed under the terms of

* the GNU General Public License Version 2. See the LICENSE file

* at the top of the source tree.

*/

/*! \file

*

* \brief Silly application to play an MP3 file -- uses mpg123

*

* \author Mark Spencer <markster@digium.com>

*

* \note Add feature to play local M3U playlist file

* Vincent Li <mchun.li@gmail.com>

*

* \ingroup applications

*/

/*** MODULEINFO

<support_level>extended</support_level>

***/

#include "asterisk.h"

#include <sys/time.h>

#include <sys/types.h>

#include <signal.h>

#include "asterisk/lock.h"

#include "asterisk/file.h"

#include "asterisk/channel.h"

#include "asterisk/frame.h"

#include "asterisk/pbx.h"

#include "asterisk/module.h"

#include "asterisk/translate.h"

#include "asterisk/app.h"

#include "asterisk/format_cache.h"

#define LOCAL_MPG_123 "/usr/local/bin/mpg123"

#define MPG_123 "/usr/bin/mpg123"

/*** DOCUMENTATION

<application name="MP3Player" language="en_US">

<synopsis>

Play an MP3 file or M3U playlist file or stream.

</synopsis>

<syntax>

<parameter name="Location" required="true">

<para>Location of the file to be played.

(argument passed to mpg123)</para>

</parameter>

</syntax>

<description>

<para>Executes mpg123 to play the given location, which typically would be a mp3 filename

or m3u playlist filename or a URL. Please read http://en.wikipedia.org/wiki/M3U

to see how M3U playlist file format is like, Example usage would be

exten => 1234,1,MP3Player(/var/lib/asterisk/playlist.m3u)

User can exit by pressing any key on the dialpad, or by hanging up.</para>

<para>This application does not automatically answer and should be preceeded by an

application such as Answer() or Progress().</para>

</description>

</application>

***/

static char *app = "MP3Player";

static int mp3play(const char *filename, unsigned int sampling_rate, int fd)

{

int res;

char sampling_rate_str[8];

res = ast_safe_fork(0);

if (res < 0)

ast_log(LOG_WARNING, "Fork failed\n");

if (res) {

return res;

}

if (ast_opt_high_priority)

ast_set_priority(0);

dup2(fd, STDOUT_FILENO);

ast_close_fds_above_n(STDERR_FILENO);

snprintf(sampling_rate_str, 8, "%u", sampling_rate);

/* Execute mpg123, but buffer if it's a net connection */

if (!strncasecmp(filename, "http://", 7) && strstr(filename, ".m3u")) {

char buffer_size_str[8];

snprintf(buffer_size_str, 8, "%u", (int) 0.5*2*sampling_rate/1000); // 0.5 seconds for a live stream

/* Most commonly installed in /usr/local/bin */

execl(LOCAL_MPG_123, "mpg123", "-q", "-s", "-b", buffer_size_str, "-f", "8192", "--mono", "-r", sampling_rate_str, "-@", filename, (char *)NULL);

/* But many places has it in /usr/bin */

execl(MPG_123, "mpg123", "-q", "-s", "-b", buffer_size_str, "-f", "8192", "--mono", "-r", sampling_rate_str, "-@", filename, (char *)NULL);

/* As a last-ditch effort, try to use PATH */

execlp("mpg123", "mpg123", "-q", "-s", "-b", buffer_size_str, "-f", "8192", "--mono", "-r", sampling_rate_str, "-@", filename, (char *)NULL);

}

else if (!strncasecmp(filename, "http://", 7)) {

char buffer_size_str[8];

snprintf(buffer_size_str, 8, "%u", 6*2*sampling_rate/1000); // 6 seconds for a remote MP3 file

/* Most commonly installed in /usr/local/bin */

execl(LOCAL_MPG_123, "mpg123", "-q", "-s", "-b", buffer_size_str, "-f", "8192", "--mono", "-r", sampling_rate_str, filename, (char *)NULL);

/* But many places has it in /usr/bin */

execl(MPG_123, "mpg123", "-q", "-s", "-b", buffer_size_str, "-f", "8192", "--mono", "-r", sampling_rate_str, filename, (char *)NULL);

/* As a last-ditch effort, try to use PATH */

execlp("mpg123", "mpg123", "-q", "-s", "-b", buffer_size_str, "-f", "8192", "--mono", "-r", sampling_rate_str, filename, (char *)NULL);

}

else if (strstr(filename, ".m3u")) {

/* Most commonly installed in /usr/local/bin */

execl(LOCAL_MPG_123, "mpg123", "-q", "-z", "-s", "-f", "8192", "--mono", "-r", sampling_rate_str, "-@", filename, (char *)NULL);

/* But many places has it in /usr/bin */

execl(MPG_123, "mpg123", "-q", "-z", "-s", "-f", "8192", "--mono", "-r", sampling_rate_str, "-@", filename, (char *)NULL);

/* As a last-ditch effort, try to use PATH */

execlp("mpg123", "mpg123", "-q", "-z", "-s", "-f", "8192", "--mono", "-r", sampling_rate_str, "-@", filename, (char *)NULL);

}

else {

/* Most commonly installed in /usr/local/bin */

execl(MPG_123, "mpg123", "-q", "-s", "-f", "8192", "--mono", "-r", sampling_rate_str, filename, (char *)NULL);

/* But many places has it in /usr/bin */

execl(LOCAL_MPG_123, "mpg123", "-q", "-s", "-f", "8192", "--mono", "-r", sampling_rate_str, filename, (char *)NULL);

/* As a last-ditch effort, try to use PATH */

execlp("mpg123", "mpg123", "-q", "-s", "-f", "8192", "--mono", "-r", sampling_rate_str, filename, (char *)NULL);

}

/* Can't use ast_log since FD's are closed */

fprintf(stderr, "Execute of mpg123 failed\n");

_exit(0);

}

static int timed_read(int fd, void *data, int datalen, int timeout, int pid)

{

int res;

int i;

struct pollfd fds[1];

fds[0].fd = fd;

fds[0].events = POLLIN;

for (i = 0; i < timeout; i++) {

res = ast_poll(fds, 1, 1000);

if (res > 0) {

break;

} else if (res == 0) {

/* is mpg123 still running? */

kill(pid, 0);

if (errno == ESRCH) {

return -1;

}

} else {

ast_log(LOG_NOTICE, "error polling mpg123: %s\n", strerror(errno));

return -1;

}

}

if (i == timeout) {

ast_log(LOG_NOTICE, "Poll timed out.\n");

return -1;

}

return read(fd, data, datalen);

}

static int mp3_exec(struct ast_channel *chan, const char *data)

{

int res=0;

int fds[2];

int ms = -1;

int pid = -1;

RAII_VAR(struct ast_format *, owriteformat, NULL, ao2_cleanup);

int timeout = 2;

struct timeval next;

struct ast_frame *f;

struct myframe {

} myf = {

.f = { 0, },

};

struct ast_format * native_format;

unsigned int sampling_rate;

struct ast_format * write_format;

if (ast_strlen_zero(data)) {

ast_log(LOG_WARNING, "MP3 Playback requires an argument (filename)\n");

return -1;

}

if (pipe(fds)) {

ast_log(LOG_WARNING, "Unable to create pipe\n");

return -1;

}

ast_stopstream(chan);

native_format = ast_format_cap_get_format(ast_channel_nativeformats(chan), 0);

sampling_rate = ast_format_get_sample_rate(native_format);

write_format = ast_format_cache_get_slin_by_rate(sampling_rate);

owriteformat = ao2_bump(ast_channel_writeformat(chan));

res = ast_set_write_format(chan, write_format);

if (res < 0) {

ast_log(LOG_WARNING, "Unable to set write format to signed linear\n");

return -1;

}

myf.f.frametype = AST_FRAME_VOICE;

myf.f.subclass.format = write_format;

myf.f.mallocd = 0;

myf.f.offset = AST_FRIENDLY_OFFSET;

myf.f.src = __PRETTY_FUNCTION__;

myf.f.delivery.tv_sec = 0;

myf.f.delivery.tv_usec = 0;

myf.f.data.ptr = myf.frdata;

res = mp3play(data, sampling_rate, fds[1]);

if (!strncasecmp(data, "http://", 7)) {

timeout = 10;

}

/* Wait 1000 ms first */

next = ast_tvnow();

next.tv_sec += 1;

if (res >= 0) {

pid = res;

/* Order is important -- there's almost always going to be mp3... we want to prioritize the

user */

for (;;) {

ms = ast_tvdiff_ms(next, ast_tvnow());

if (ms <= 0) {

res = timed_read(fds[0], myf.frdata, sizeof(myf.frdata), timeout, pid);

if (res > 0) {

myf.f.datalen = res;

myf.f.samples = res / 2;

if (ast_write(chan, &myf.f) < 0) {

res = -1;

break;

}

} else {

ast_debug(1, "No more mp3\n");

res = 0;

break;

}

next = ast_tvadd(next, ast_samp2tv(myf.f.samples, sampling_rate));

} else {

ms = ast_waitfor(chan, ms);

if (ms < 0) {

ast_debug(1, "Hangup detected\n");

res = -1;

break;

}

if (ms) {

f = ast_read(chan);

if (!f) {

ast_debug(1, "Null frame == hangup() detected\n");

res = -1;

break;

}

if (f->frametype == AST_FRAME_DTMF) {

ast_debug(1, "User pressed a key\n");

ast_frfree(f);

res = 0;

break;

}

ast_frfree(f);

}

}

}

}

close(fds[0]);

close(fds[1]);

if (pid > -1)

kill(pid, SIGKILL);

if (!res && owriteformat)

ast_set_write_format(chan, owriteformat);

ast_frfree(&myf.f);

return res;

}

static int unload_module(void)

{

return ast_unregister_application(app);

}

static int load_module(void)

{

return ast_register_application_xml(app, mp3_exec);

}

AST_MODULE_INFO_STANDARD_EXTENDED(ASTERISK_GPL_KEY, "Silly MP3 Application");