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282 lines
6.5 KiB
282 lines
6.5 KiB
/*
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* Asterisk -- An open source telephony toolkit.
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*
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* Copyright (C) 1999 - 2006, Digium, Inc.
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*
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* Mark Spencer <markster@digium.com>
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*
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* See http://www.asterisk.org for more information about
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* the Asterisk project. Please do not directly contact
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* any of the maintainers of this project for assistance;
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* the project provides a web site, mailing lists and IRC
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* channels for your use.
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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 Version 2. See the LICENSE file
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* at the top of the source tree.
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*/
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/*! \file
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*
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* \brief Flat, binary, ulaw PCM file format.
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* \arg File name extension: pcm, ulaw, ul, mu
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*
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* \ingroup formats
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*/
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#include <unistd.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 <errno.h>
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#include <string.h>
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#include "asterisk.h"
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ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
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#include "asterisk/lock.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 "asterisk/endian.h"
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#include "asterisk/ulaw.h"
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#define BUF_SIZE 160 /* 160 samples */
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struct ast_filestream {
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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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FILE *f; /* Descriptor */
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struct ast_channel *owner;
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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 buf[BUF_SIZE]; /* Output Buffer */
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struct timeval last;
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};
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AST_MUTEX_DEFINE_STATIC(pcm_lock);
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static int glistcnt = 0;
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static char *name = "pcm";
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static char *desc = "Raw uLaw 8khz Audio support (PCM)";
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static char *exts = "pcm|ulaw|ul|mu";
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static char ulaw_silence[BUF_SIZE];
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static struct ast_filestream *pcm_open(FILE *f)
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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(&pcm_lock)) {
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ast_log(LOG_WARNING, "Unable to lock pcm list\n");
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free(tmp);
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return NULL;
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}
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tmp->f = f;
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tmp->fr.data = tmp->buf;
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tmp->fr.frametype = AST_FRAME_VOICE;
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tmp->fr.subclass = AST_FORMAT_ULAW;
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/* datalen will vary for each frame */
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tmp->fr.src = name;
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tmp->fr.mallocd = 0;
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glistcnt++;
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ast_mutex_unlock(&pcm_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 *pcm_rewrite(FILE *f, const 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(&pcm_lock)) {
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ast_log(LOG_WARNING, "Unable to lock pcm list\n");
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free(tmp);
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return NULL;
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}
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tmp->f = f;
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glistcnt++;
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ast_mutex_unlock(&pcm_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 void pcm_close(struct ast_filestream *s)
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{
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if (ast_mutex_lock(&pcm_lock)) {
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ast_log(LOG_WARNING, "Unable to lock pcm list\n");
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return;
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}
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glistcnt--;
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ast_mutex_unlock(&pcm_lock);
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ast_update_use_count();
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fclose(s->f);
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free(s);
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s = NULL;
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}
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static struct ast_frame *pcm_read(struct ast_filestream *s, int *whennext)
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{
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int res;
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int delay;
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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_ULAW;
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s->fr.offset = AST_FRIENDLY_OFFSET;
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s->fr.mallocd = 0;
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s->fr.data = s->buf;
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if ((res = fread(s->buf, 1, BUF_SIZE, s->f)) < 1) {
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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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s->fr.samples = res;
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s->fr.datalen = res;
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delay = s->fr.samples;
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*whennext = delay;
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return &s->fr;
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}
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static int pcm_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_ULAW) {
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ast_log(LOG_WARNING, "Asked to write non-ulaw frame (%d)!\n", f->subclass);
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return -1;
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}
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if ((res = fwrite(f->data, 1, f->datalen, fs->f)) != f->datalen) {
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ast_log(LOG_WARNING, "Bad write (%d/%d): %s\n", res, f->datalen, 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 int pcm_seek(struct ast_filestream *fs, long sample_offset, int whence)
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{
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long cur, max, offset = 0;
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int ret = -1; /* assume error */
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cur = ftell(fs->f);
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fseek(fs->f, 0, SEEK_END);
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max = ftell(fs->f);
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switch (whence) {
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case SEEK_SET:
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offset = sample_offset;
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break;
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case SEEK_END:
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offset = max - sample_offset;
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break;
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case SEEK_CUR:
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case SEEK_FORCECUR:
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offset = cur + sample_offset;
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break;
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default:
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ast_log(LOG_WARNING, "invalid whence %d, assuming SEEK_SET\n", whence);
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offset = sample_offset;
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}
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if (offset < 0) {
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ast_log(LOG_WARNING, "negative offset %ld, resetting to 0\n", offset);
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offset = 0;
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}
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if (whence == SEEK_FORCECUR && offset > max) { /* extend the file */
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size_t left = offset - max;
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while (left) {
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size_t written = fwrite(ulaw_silence, sizeof(ulaw_silence[0]),
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(left > BUF_SIZE) ? BUF_SIZE : left, fs->f);
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if (written == -1)
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break; /* error */
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left -= written * sizeof(ulaw_silence[0]);
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}
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ret = 0; /* successful */
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} else {
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if (offset > max) {
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ast_log(LOG_WARNING, "offset too large %ld, truncating to %ld\n", offset, max);
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offset = max;
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}
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ret = fseek(fs->f, offset, SEEK_SET);
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}
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return ret;
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}
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static int pcm_trunc(struct ast_filestream *fs)
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{
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return ftruncate(fileno(fs->f), ftell(fs->f));
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}
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static long pcm_tell(struct ast_filestream *fs)
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{
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off_t offset;
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offset = ftell(fs->f);
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return offset;
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}
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static char *pcm_getcomment(struct ast_filestream *s)
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{
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return NULL;
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}
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int load_module()
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{
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int index;
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for (index = 0; index < (sizeof(ulaw_silence) / sizeof(ulaw_silence[0])); index++)
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ulaw_silence[index] = AST_LIN2MU(0);
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return ast_format_register(name, exts, AST_FORMAT_ULAW,
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pcm_open,
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pcm_rewrite,
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pcm_write,
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pcm_seek,
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pcm_trunc,
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pcm_tell,
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pcm_read,
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pcm_close,
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pcm_getcomment);
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}
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int unload_module()
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{
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return ast_format_unregister(name);
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}
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int usecount()
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{
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return glistcnt;
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}
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char *description()
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{
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return desc;
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}
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char *key()
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{
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return ASTERISK_GPL_KEY;
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}
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