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65c3fe8b33
git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@2731 65c4cc65-6c06-0410-ace0-fbb531ad65f3
505 lines
13 KiB
C
Executable File
505 lines
13 KiB
C
Executable File
/*
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* Headerless G.726 (16/24/32/40kbps) data format for Asterisk.
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*
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* Copyright (c) 2004, inAccess Networks
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*
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* Michael Manousos <manousos@inaccessnetworks.com>
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*
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* This program is free software, distributed under the terms of
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* the GNU General Public License
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*/
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#include <asterisk/lock.h>
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#include <asterisk/options.h>
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#include <asterisk/channel.h>
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#include <asterisk/file.h>
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#include <asterisk/logger.h>
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#include <asterisk/sched.h>
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#include <asterisk/module.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <stdlib.h>
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#include <sys/time.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <errno.h>
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#include <string.h>
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#include <pthread.h>
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#ifdef __linux__
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#include <endian.h>
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#else
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#include <machine/endian.h>
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#endif
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#define RATE_40 0
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#define RATE_32 1
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#define RATE_24 2
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#define RATE_16 3
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/* We can only read/write chunks of FRAME_TIME ms G.726 data */
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#define FRAME_TIME 10 /* 10 ms size */
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/* Frame sizes in bytes */
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static int frame_size[4] = {
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FRAME_TIME * 5,
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FRAME_TIME * 4,
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FRAME_TIME * 3,
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FRAME_TIME * 2
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};
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struct ast_filestream {
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/* Do not place anything before "reserved" */
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void *reserved[AST_RESERVED_POINTERS];
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/* This is what a filestream means to us */
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int fd; /* Open file descriptor */
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int rate; /* RATE_* defines */
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struct ast_frame fr; /* Frame information */
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char waste[AST_FRIENDLY_OFFSET]; /* Buffer for sending frames, etc */
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char empty; /* Empty character */
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unsigned char g726[FRAME_TIME * 5]; /* G.726 encoded voice */
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};
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static ast_mutex_t g726_lock = AST_MUTEX_INITIALIZER;
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static int glistcnt = 0;
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static char *desc = "Raw G.726 (16/24/32/40kbps) data";
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static char *name40 = "g726-40";
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static char *name32 = "g726-32";
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static char *name24 = "g726-24";
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static char *name16 = "g726-16";
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static char *exts40 = "g726-40";
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static char *exts32 = "g726-32";
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static char *exts24 = "g726-24";
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static char *exts16 = "g726-16";
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/*
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* Rate dependant format functions (open, rewrite)
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*/
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static struct ast_filestream *g726_40_open(int fd)
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{
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/* We don't have any header to read or anything really, but
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if we did, it would go here. We also might want to check
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and be sure it's a valid file. */
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struct ast_filestream *tmp;
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if ((tmp = malloc(sizeof(struct ast_filestream)))) {
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memset(tmp, 0, sizeof(struct ast_filestream));
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if (ast_mutex_lock(&g726_lock)) {
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ast_log(LOG_WARNING, "Unable to lock g726 list.\n");
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free(tmp);
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return NULL;
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}
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tmp->fd = fd;
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tmp->rate = RATE_40;
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tmp->fr.data = tmp->g726;
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tmp->fr.frametype = AST_FRAME_VOICE;
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tmp->fr.subclass = AST_FORMAT_G726;
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/* datalen will vary for each frame */
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tmp->fr.src = name40;
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tmp->fr.mallocd = 0;
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glistcnt++;
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if (option_debug)
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ast_log(LOG_DEBUG, "Created filestream G.726-%dk.\n",
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40 - tmp->rate * 8);
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ast_mutex_unlock(&g726_lock);
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ast_update_use_count();
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}
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return tmp;
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}
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static struct ast_filestream *g726_32_open(int fd)
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{
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/* We don't have any header to read or anything really, but
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if we did, it would go here. We also might want to check
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and be sure it's a valid file. */
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struct ast_filestream *tmp;
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if ((tmp = malloc(sizeof(struct ast_filestream)))) {
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memset(tmp, 0, sizeof(struct ast_filestream));
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if (ast_mutex_lock(&g726_lock)) {
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ast_log(LOG_WARNING, "Unable to lock g726 list.\n");
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free(tmp);
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return NULL;
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}
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tmp->fd = fd;
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tmp->rate = RATE_32;
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tmp->fr.data = tmp->g726;
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tmp->fr.frametype = AST_FRAME_VOICE;
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tmp->fr.subclass = AST_FORMAT_G726;
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/* datalen will vary for each frame */
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tmp->fr.src = name32;
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tmp->fr.mallocd = 0;
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glistcnt++;
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if (option_debug)
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ast_log(LOG_DEBUG, "Created filestream G.726-%dk.\n",
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40 - tmp->rate * 8);
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ast_mutex_unlock(&g726_lock);
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ast_update_use_count();
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}
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return tmp;
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}
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static struct ast_filestream *g726_24_open(int fd)
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{
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/* We don't have any header to read or anything really, but
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if we did, it would go here. We also might want to check
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and be sure it's a valid file. */
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struct ast_filestream *tmp;
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if ((tmp = malloc(sizeof(struct ast_filestream)))) {
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memset(tmp, 0, sizeof(struct ast_filestream));
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if (ast_mutex_lock(&g726_lock)) {
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ast_log(LOG_WARNING, "Unable to lock g726 list.\n");
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free(tmp);
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return NULL;
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}
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tmp->fd = fd;
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tmp->rate = RATE_24;
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tmp->fr.data = tmp->g726;
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tmp->fr.frametype = AST_FRAME_VOICE;
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tmp->fr.subclass = AST_FORMAT_G726;
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/* datalen will vary for each frame */
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tmp->fr.src = name24;
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tmp->fr.mallocd = 0;
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glistcnt++;
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if (option_debug)
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ast_log(LOG_DEBUG, "Created filestream G.726-%dk.\n",
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40 - tmp->rate * 8);
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ast_mutex_unlock(&g726_lock);
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ast_update_use_count();
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}
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return tmp;
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}
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static struct ast_filestream *g726_16_open(int fd)
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{
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/* We don't have any header to read or anything really, but
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if we did, it would go here. We also might want to check
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and be sure it's a valid file. */
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struct ast_filestream *tmp;
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if ((tmp = malloc(sizeof(struct ast_filestream)))) {
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memset(tmp, 0, sizeof(struct ast_filestream));
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if (ast_mutex_lock(&g726_lock)) {
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ast_log(LOG_WARNING, "Unable to lock g726 list.\n");
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free(tmp);
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return NULL;
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}
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tmp->fd = fd;
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tmp->rate = RATE_16;
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tmp->fr.data = tmp->g726;
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tmp->fr.frametype = AST_FRAME_VOICE;
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tmp->fr.subclass = AST_FORMAT_G726;
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/* datalen will vary for each frame */
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tmp->fr.src = name16;
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tmp->fr.mallocd = 0;
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glistcnt++;
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if (option_debug)
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ast_log(LOG_DEBUG, "Created filestream G.726-%dk.\n",
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40 - tmp->rate * 8);
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ast_mutex_unlock(&g726_lock);
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ast_update_use_count();
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}
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return tmp;
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}
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static struct ast_filestream *g726_40_rewrite(int fd, char *comment)
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{
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/* We don't have any header to read or anything really, but
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if we did, it would go here. We also might want to check
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and be sure it's a valid file. */
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struct ast_filestream *tmp;
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if ((tmp = malloc(sizeof(struct ast_filestream)))) {
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memset(tmp, 0, sizeof(struct ast_filestream));
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if (ast_mutex_lock(&g726_lock)) {
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ast_log(LOG_WARNING, "Unable to lock g726 list.\n");
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free(tmp);
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return NULL;
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}
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tmp->fd = fd;
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tmp->rate = RATE_40;
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glistcnt++;
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if (option_debug)
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ast_log(LOG_DEBUG, "Created filestream G.726-%dk.\n",
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40 - tmp->rate * 8);
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ast_mutex_unlock(&g726_lock);
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ast_update_use_count();
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} else
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ast_log(LOG_WARNING, "Out of memory\n");
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return tmp;
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}
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static struct ast_filestream *g726_32_rewrite(int fd, char *comment)
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{
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/* We don't have any header to read or anything really, but
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if we did, it would go here. We also might want to check
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and be sure it's a valid file. */
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struct ast_filestream *tmp;
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if ((tmp = malloc(sizeof(struct ast_filestream)))) {
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memset(tmp, 0, sizeof(struct ast_filestream));
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if (ast_mutex_lock(&g726_lock)) {
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ast_log(LOG_WARNING, "Unable to lock g726 list.\n");
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free(tmp);
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return NULL;
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}
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tmp->fd = fd;
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tmp->rate = RATE_32;
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glistcnt++;
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if (option_debug)
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ast_log(LOG_DEBUG, "Created filestream G.726-%dk.\n",
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40 - tmp->rate * 8);
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ast_mutex_unlock(&g726_lock);
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ast_update_use_count();
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} else
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ast_log(LOG_WARNING, "Out of memory\n");
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return tmp;
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}
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static struct ast_filestream *g726_24_rewrite(int fd, char *comment)
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{
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/* We don't have any header to read or anything really, but
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if we did, it would go here. We also might want to check
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and be sure it's a valid file. */
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struct ast_filestream *tmp;
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if ((tmp = malloc(sizeof(struct ast_filestream)))) {
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memset(tmp, 0, sizeof(struct ast_filestream));
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if (ast_mutex_lock(&g726_lock)) {
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ast_log(LOG_WARNING, "Unable to lock g726 list.\n");
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free(tmp);
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return NULL;
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}
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tmp->fd = fd;
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tmp->rate = RATE_24;
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glistcnt++;
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if (option_debug)
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ast_log(LOG_DEBUG, "Created filestream G.726-%dk.\n",
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40 - tmp->rate * 8);
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ast_mutex_unlock(&g726_lock);
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ast_update_use_count();
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} else
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ast_log(LOG_WARNING, "Out of memory\n");
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return tmp;
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}
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static struct ast_filestream *g726_16_rewrite(int fd, char *comment)
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{
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/* We don't have any header to read or anything really, but
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if we did, it would go here. We also might want to check
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and be sure it's a valid file. */
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struct ast_filestream *tmp;
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if ((tmp = malloc(sizeof(struct ast_filestream)))) {
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memset(tmp, 0, sizeof(struct ast_filestream));
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if (ast_mutex_lock(&g726_lock)) {
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ast_log(LOG_WARNING, "Unable to lock g726 list.\n");
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free(tmp);
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return NULL;
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}
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tmp->fd = fd;
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tmp->rate = RATE_16;
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glistcnt++;
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if (option_debug)
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ast_log(LOG_DEBUG, "Created filestream G.726-%dk.\n",
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40 - tmp->rate * 8);
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ast_mutex_unlock(&g726_lock);
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ast_update_use_count();
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} else
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ast_log(LOG_WARNING, "Out of memory\n");
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return tmp;
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}
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/*
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* Rate independent format functions (close, read, write)
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*/
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static void g726_close(struct ast_filestream *s)
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{
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if (ast_mutex_lock(&g726_lock)) {
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ast_log(LOG_WARNING, "Unable to lock g726 list.\n");
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return;
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}
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glistcnt--;
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if (option_debug)
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ast_log(LOG_DEBUG, "Closed filestream G.726-%dk.\n", 40 - s->rate * 8);
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ast_mutex_unlock(&g726_lock);
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ast_update_use_count();
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close(s->fd);
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free(s);
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s = NULL;
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}
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static struct ast_frame *g726_read(struct ast_filestream *s, int *whennext)
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{
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int res;
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/* Send a frame from the file to the appropriate channel */
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s->fr.frametype = AST_FRAME_VOICE;
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s->fr.subclass = AST_FORMAT_G726;
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s->fr.offset = AST_FRIENDLY_OFFSET;
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s->fr.samples = 8 * FRAME_TIME;
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s->fr.datalen = frame_size[s->rate];
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s->fr.mallocd = 0;
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s->fr.data = s->g726;
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if ((res = read(s->fd, s->g726, s->fr.datalen)) != s->fr.datalen) {
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if (res)
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ast_log(LOG_WARNING, "Short read (%d) (%s)!\n", res, strerror(errno));
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return NULL;
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}
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*whennext = s->fr.samples;
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return &s->fr;
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}
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static int g726_write(struct ast_filestream *fs, struct ast_frame *f)
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{
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int res;
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if (f->frametype != AST_FRAME_VOICE) {
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ast_log(LOG_WARNING, "Asked to write non-voice frame!\n");
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return -1;
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}
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if (f->subclass != AST_FORMAT_G726) {
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ast_log(LOG_WARNING, "Asked to write non-G726 frame (%d)!\n",
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f->subclass);
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return -1;
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}
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if (f->datalen % frame_size[fs->rate]) {
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ast_log(LOG_WARNING, "Invalid data length %d, should be multiple of %d\n",
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f->datalen, frame_size[fs->rate]);
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return -1;
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}
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if ((res = write(fs->fd, f->data, f->datalen)) != f->datalen) {
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ast_log(LOG_WARNING, "Bad write (%d/%d): %s\n",
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res, frame_size[fs->rate], strerror(errno));
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return -1;
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}
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return 0;
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}
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static char *g726_getcomment(struct ast_filestream *s)
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{
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return NULL;
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}
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static int g726_seek(struct ast_filestream *fs, long sample_offset, int whence)
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{
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return -1;
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}
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static int g726_trunc(struct ast_filestream *fs)
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{
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return -1;
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}
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static long g726_tell(struct ast_filestream *fs)
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{
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return -1;
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}
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/*
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* Module interface (load_module, unload_module, usecount, description, key)
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*/
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int load_module()
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{
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int res;
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res = ast_format_register(name40, exts40, AST_FORMAT_G726,
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g726_40_open,
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g726_40_rewrite,
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g726_write,
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g726_seek,
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g726_trunc,
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g726_tell,
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g726_read,
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g726_close,
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g726_getcomment);
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if (res) {
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ast_log(LOG_WARNING, "Failed to register format %s.\n", name40);
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return(-1);
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}
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res = ast_format_register(name32, exts32, AST_FORMAT_G726,
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g726_32_open,
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g726_32_rewrite,
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g726_write,
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g726_seek,
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g726_trunc,
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g726_tell,
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g726_read,
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g726_close,
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g726_getcomment);
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if (res) {
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ast_log(LOG_WARNING, "Failed to register format %s.\n", name32);
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return(-1);
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}
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res = ast_format_register(name24, exts24, AST_FORMAT_G726,
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g726_24_open,
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g726_24_rewrite,
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g726_write,
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g726_seek,
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g726_trunc,
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g726_tell,
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g726_read,
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g726_close,
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g726_getcomment);
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if (res) {
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ast_log(LOG_WARNING, "Failed to register format %s.\n", name24);
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return(-1);
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}
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res = ast_format_register(name16, exts16, AST_FORMAT_G726,
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g726_16_open,
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g726_16_rewrite,
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g726_write,
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g726_seek,
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g726_trunc,
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g726_tell,
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g726_read,
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g726_close,
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g726_getcomment);
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if (res) {
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ast_log(LOG_WARNING, "Failed to register format %s.\n", name16);
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return(-1);
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}
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return(0);
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}
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int unload_module()
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{
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int res;
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res = ast_format_unregister(name16);
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if (res) {
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ast_log(LOG_WARNING, "Failed to unregister format %s.\n", name16);
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return(-1);
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}
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res = ast_format_unregister(name24);
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if (res) {
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ast_log(LOG_WARNING, "Failed to unregister format %s.\n", name24);
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return(-1);
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}
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res = ast_format_unregister(name32);
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if (res) {
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ast_log(LOG_WARNING, "Failed to unregister format %s.\n", name32);
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return(-1);
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}
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res = ast_format_unregister(name40);
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if (res) {
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ast_log(LOG_WARNING, "Failed to unregister format %s.\n", name40);
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return(-1);
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}
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return(0);
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}
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int usecount()
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{
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int res;
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if (ast_mutex_lock(&g726_lock)) {
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ast_log(LOG_WARNING, "Unable to lock g726 list.\n");
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return -1;
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}
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res = glistcnt;
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ast_mutex_unlock(&g726_lock);
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return res;
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}
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char *description()
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{
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return desc;
|
|
}
|
|
|
|
char *key()
|
|
{
|
|
return ASTERISK_GPL_KEY;
|
|
}
|
|
|