add rawplayer applet to contrib/utils

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@4675 65c4cc65-6c06-0410-ace0-fbb531ad65f3

contrib/utils/README.rawplayer

+rawplayer is a simple C applet to stream raw music files in place of mpg123
+
+INSTALL
+
+compile the .c file and install:
+gcc -O2 rawplayer.c -o /usr/bin/rawplayer
+
+
+
+Converting MP3 to RAW
+
+Make track01.mp3 into track01.raw with sox (if compiled with mp3 support).
+sox -c 1 track01.mp3 -t raw -r 8000 -c 1 -s -w track01.raw
+
+Otherwise, use whatever app to turn track01.mp3 into track01.wav then use sox on the wav.
+sox -c 1 track01.wav -t raw -r 8000 -c 1 -s -w track01.raw
+
+
+Once you have the raw files put them in any dir on your system (eg /var/lib/asterisk/holdmusic_raw).
+and set up a class in musiconhold.conf like so:
+
+[classes]
+default => custom:/var/lib/asterisk/holdmusic_raw,/usr/bin/rawplayer
+
+
+This is the most efficient way to implement moh because no cpu usage is required to 
+explode the very compressed mp3 data then downsample the music to the 8khz mono on the fly
+instead the data is already stored on the disk in the format that asterisk needs it to be 
+and the player does little more than pick up frames from the file and hand them to right 
+to the asterisk pipe where the audio is shared into all the channels who require it.
+
+
+If you have cpu to spare and want a simple mp3 solution consider the format_mp3 from
+asterisk-addons and the files based moh.
+
+
+

contrib/utils/rawplayer.c

+/*
+  Rawplayer.c simple raw file stdout player
+  (c) Anthony C Minessale II <anthmct@yahoo.com>
+*/
+
+#define BUFLEN 320
+#include <stdio.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+static int deliver_file(char *path, int fdout) {
+	int fd = 0, bytes = 0;
+	short buf[BUFLEN];
+
+	if ((fd = open(path,O_RDONLY))) {
+		while ((bytes=read(fd, buf, BUFLEN))) {
+			write(fdout, buf, bytes);
+		}
+		if(fd)
+			close(fd);
+	} else 
+		return -1;
+	
+	return 0;
+}
+
+
+int main(int argc, char *argv[]) {
+	int x = 0, fdout = 0;
+	fdout = fileno(stdout);
+	for (;;)
+		for (x = 1; x < argc ; x++) {
+			if(deliver_file(argv[x], fdout))
+				exit(1);
+		}
+}
+