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-rw-r--r--1.4.23-rc4/formats/format_g726.c277
1 files changed, 277 insertions, 0 deletions
diff --git a/1.4.23-rc4/formats/format_g726.c b/1.4.23-rc4/formats/format_g726.c
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index 000000000..499d545d2
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+++ b/1.4.23-rc4/formats/format_g726.c
@@ -0,0 +1,277 @@
+/*
+ * Asterisk -- An open source telephony toolkit.
+ *
+ * Copyright (c) 2004 - 2005, inAccess Networks
+ *
+ * Michael Manousos <manousos@inaccessnetworks.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 Headerless G.726 (16/24/32/40kbps) data format for Asterisk.
+ *
+ * File name extensions:
+ * \arg 40 kbps: g726-40
+ * \arg 32 kbps: g726-32
+ * \arg 24 kbps: g726-24
+ * \arg 16 kbps: g726-16
+ * \ingroup formats
+ */
+
+#include "asterisk.h"
+
+ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
+
+#include <unistd.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <stdlib.h>
+#include <sys/time.h>
+#include <stdio.h>
+#include <errno.h>
+#include <string.h>
+
+#include "asterisk/lock.h"
+#include "asterisk/options.h"
+#include "asterisk/channel.h"
+#include "asterisk/file.h"
+#include "asterisk/logger.h"
+#include "asterisk/sched.h"
+#include "asterisk/module.h"
+#include "asterisk/endian.h"
+
+#define RATE_40 0
+#define RATE_32 1
+#define RATE_24 2
+#define RATE_16 3
+
+/* We can only read/write chunks of FRAME_TIME ms G.726 data */
+#define FRAME_TIME 10 /* 10 ms size */
+
+#define BUF_SIZE (5*FRAME_TIME) /* max frame size in bytes ? */
+/* Frame sizes in bytes */
+static int frame_size[4] = {
+ FRAME_TIME * 5,
+ FRAME_TIME * 4,
+ FRAME_TIME * 3,
+ FRAME_TIME * 2
+};
+
+struct g726_desc {
+ int rate; /* RATE_* defines */
+};
+
+/*
+ * Rate dependant format functions (open, rewrite)
+ */
+static int g726_open(struct ast_filestream *tmp, int rate)
+{
+ struct g726_desc *s = (struct g726_desc *)tmp->_private;
+ s->rate = rate;
+ if (option_debug)
+ ast_log(LOG_DEBUG, "Created filestream G.726-%dk.\n",
+ 40 - s->rate * 8);
+ return 0;
+}
+
+static int g726_40_open(struct ast_filestream *s)
+{
+ return g726_open(s, RATE_40);
+}
+
+static int g726_32_open(struct ast_filestream *s)
+{
+ return g726_open(s, RATE_32);
+}
+
+static int g726_24_open(struct ast_filestream *s)
+{
+ return g726_open(s, RATE_24);
+}
+
+static int g726_16_open(struct ast_filestream *s)
+{
+ return g726_open(s, RATE_16);
+}
+
+static int g726_40_rewrite(struct ast_filestream *s, const char *comment)
+{
+ return g726_open(s, RATE_40);
+}
+
+static int g726_32_rewrite(struct ast_filestream *s, const char *comment)
+{
+ return g726_open(s, RATE_32);
+}
+
+static int g726_24_rewrite(struct ast_filestream *s, const char *comment)
+{
+ return g726_open(s, RATE_24);
+}
+
+static int g726_16_rewrite(struct ast_filestream *s, const char *comment)
+{
+ return g726_open(s, RATE_16);
+}
+
+/*
+ * Rate independent format functions (read, write)
+ */
+
+static struct ast_frame *g726_read(struct ast_filestream *s, int *whennext)
+{
+ int res;
+ struct g726_desc *fs = (struct g726_desc *)s->_private;
+
+ /* Send a frame from the file to the appropriate channel */
+ s->fr.frametype = AST_FRAME_VOICE;
+ s->fr.subclass = AST_FORMAT_G726;
+ s->fr.mallocd = 0;
+ AST_FRAME_SET_BUFFER(&s->fr, s->buf, AST_FRIENDLY_OFFSET, frame_size[fs->rate]);
+ s->fr.samples = 8 * FRAME_TIME;
+ if ((res = fread(s->fr.data, 1, s->fr.datalen, s->f)) != s->fr.datalen) {
+ if (res)
+ ast_log(LOG_WARNING, "Short read (%d) (%s)!\n", res, strerror(errno));
+ return NULL;
+ }
+ *whennext = s->fr.samples;
+ return &s->fr;
+}
+
+static int g726_write(struct ast_filestream *s, struct ast_frame *f)
+{
+ int res;
+ struct g726_desc *fs = (struct g726_desc *)s->_private;
+
+ if (f->frametype != AST_FRAME_VOICE) {
+ ast_log(LOG_WARNING, "Asked to write non-voice frame!\n");
+ return -1;
+ }
+ if (f->subclass != AST_FORMAT_G726) {
+ ast_log(LOG_WARNING, "Asked to write non-G726 frame (%d)!\n",
+ f->subclass);
+ return -1;
+ }
+ if (f->datalen % frame_size[fs->rate]) {
+ ast_log(LOG_WARNING, "Invalid data length %d, should be multiple of %d\n",
+ f->datalen, frame_size[fs->rate]);
+ return -1;
+ }
+ if ((res = fwrite(f->data, 1, f->datalen, s->f)) != f->datalen) {
+ ast_log(LOG_WARNING, "Bad write (%d/%d): %s\n",
+ res, frame_size[fs->rate], strerror(errno));
+ return -1;
+ }
+ return 0;
+}
+
+static int g726_seek(struct ast_filestream *fs, off_t sample_offset, int whence)
+{
+ return -1;
+}
+
+static int g726_trunc(struct ast_filestream *fs)
+{
+ return -1;
+}
+
+static off_t g726_tell(struct ast_filestream *fs)
+{
+ return -1;
+}
+
+static const struct ast_format f[] = {
+ {
+ .name = "g726-40",
+ .exts = "g726-40",
+ .format = AST_FORMAT_G726,
+ .open = g726_40_open,
+ .rewrite = g726_40_rewrite,
+ .write = g726_write,
+ .seek = g726_seek,
+ .trunc = g726_trunc,
+ .tell = g726_tell,
+ .read = g726_read,
+ .buf_size = BUF_SIZE + AST_FRIENDLY_OFFSET,
+ .desc_size = sizeof(struct g726_desc),
+ },
+ {
+ .name = "g726-32",
+ .exts = "g726-32",
+ .format = AST_FORMAT_G726,
+ .open = g726_32_open,
+ .rewrite = g726_32_rewrite,
+ .write = g726_write,
+ .seek = g726_seek,
+ .trunc = g726_trunc,
+ .tell = g726_tell,
+ .read = g726_read,
+ .buf_size = BUF_SIZE + AST_FRIENDLY_OFFSET,
+ .desc_size = sizeof(struct g726_desc),
+ },
+ {
+ .name = "g726-24",
+ .exts = "g726-24",
+ .format = AST_FORMAT_G726,
+ .open = g726_24_open,
+ .rewrite = g726_24_rewrite,
+ .write = g726_write,
+ .seek = g726_seek,
+ .trunc = g726_trunc,
+ .tell = g726_tell,
+ .read = g726_read,
+ .buf_size = BUF_SIZE + AST_FRIENDLY_OFFSET,
+ .desc_size = sizeof(struct g726_desc),
+ },
+ {
+ .name = "g726-16",
+ .exts = "g726-16",
+ .format = AST_FORMAT_G726,
+ .open = g726_16_open,
+ .rewrite = g726_16_rewrite,
+ .write = g726_write,
+ .seek = g726_seek,
+ .trunc = g726_trunc,
+ .tell = g726_tell,
+ .read = g726_read,
+ .buf_size = BUF_SIZE + AST_FRIENDLY_OFFSET,
+ .desc_size = sizeof(struct g726_desc),
+ },
+ { .format = 0 } /* terminator */
+};
+
+static int load_module(void)
+{
+ int i;
+
+ for (i = 0; f[i].format ; i++) {
+ if (ast_format_register(&f[i])) { /* errors are fatal */
+ ast_log(LOG_WARNING, "Failed to register format %s.\n", f[i].name);
+ return -1;
+ }
+ }
+ return 0;
+}
+
+static int unload_module(void)
+{
+ int i;
+
+ for (i = 0; f[i].format ; i++) {
+ if (ast_format_unregister(f[i].name))
+ ast_log(LOG_WARNING, "Failed to unregister format %s.\n", f[i].name);
+ }
+ return(0);
+}
+
+AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Raw G.726 (16/24/32/40kbps) data");