addition of G.719 pass-through support

(closes issue #16293)
Reported by: malcolmd
Patches:
      g719.passthrough.patch.7 uploaded by malcolmd (license 924)
      format_g719.c uploaded by malcolmd (license 924)



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@270940 65c4cc65-6c06-0410-ace0-fbb531ad65f3

formats/format_g719.c

@@ -0,0 +1,143 @@
+/*
+ * Asterisk -- An open source telephony toolkit.
+ *
+ * Copyright (C) 1999 - 2010, Anthony Minessale and Digium, Inc.
+ * Anthony Minessale (anthmct@yahoo.com)
+ * Kevin P. Fleming <kpfleming@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 ITU G.719 , 64kbps bitrate only
+ * \arg File name extensions: g719
+ * \ingroup formats
+ */
+ 
+#include "asterisk.h"
+
+ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
+
+#include "asterisk/mod_format.h"
+#include "asterisk/module.h"
+#include "asterisk/endian.h"
+
+#define BUF_SIZE	160		/* 20 milliseconds == 160 bytes, 960 samples */
+#define SAMPLES_TO_BYTES(x)	((typeof(x)) x / ((float) 960 / 160))
+#define BYTES_TO_SAMPLES(x)	((typeof(x)) x * ((float) 960 / 160))
+
+static struct ast_frame *g719read(struct ast_filestream *s, int *whennext)
+{
+	int res;
+	/* Send a frame from the file to the appropriate channel */
+
+	s->fr.frametype = AST_FRAME_VOICE;
+	s->fr.subclass.codec = AST_FORMAT_G719;
+	s->fr.mallocd = 0;
+	AST_FRAME_SET_BUFFER(&s->fr, s->buf, AST_FRIENDLY_OFFSET, BUF_SIZE);
+	if ((res = fread(s->fr.data.ptr, 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 = BYTES_TO_SAMPLES(res);
+	return &s->fr;
+}
+
+static int g719write(struct ast_filestream *fs, struct ast_frame *f)
+{
+	int res;
+
+	if (f->frametype != AST_FRAME_VOICE) {
+		ast_log(LOG_WARNING, "Asked to write non-voice frame!\n");
+		return -1;
+	}
+	if (f->subclass.codec != AST_FORMAT_G719) {
+		ast_log(LOG_WARNING, "Asked to write non-G.719 frame (%s)!\n", ast_getformatname(f->subclass.codec));
+		return -1;
+	}
+	if ((res = fwrite(f->data.ptr, 1, f->datalen, fs->f)) != f->datalen) {
+		ast_log(LOG_WARNING, "Bad write (%d/%d): %s\n", res, f->datalen, strerror(errno));
+		return -1;
+	}
+	return 0;
+}
+
+static int g719seek(struct ast_filestream *fs, off_t sample_offset, int whence)
+{
+	off_t offset = 0, min = 0, cur, max;
+
+	sample_offset = SAMPLES_TO_BYTES(sample_offset);
+
+	cur = ftello(fs->f);
+
+	fseeko(fs->f, 0, SEEK_END);
+
+	max = ftello(fs->f);
+
+	if (whence == SEEK_SET)
+		offset = sample_offset;
+	else if (whence == SEEK_CUR || whence == SEEK_FORCECUR)
+		offset = sample_offset + cur;
+	else if (whence == SEEK_END)
+		offset = max - sample_offset;
+
+	if (whence != SEEK_FORCECUR)
+		offset = (offset > max) ? max : offset;
+
+	/* always protect against seeking past begining. */
+	offset = (offset < min) ? min : offset;
+
+	return fseeko(fs->f, offset, SEEK_SET);
+}
+
+static int g719trunc(struct ast_filestream *fs)
+{
+	return ftruncate(fileno(fs->f), ftello(fs->f));
+}
+
+static off_t g719tell(struct ast_filestream *fs)
+{
+	return BYTES_TO_SAMPLES(ftello(fs->f));
+}
+
+static const struct ast_format g719_f = {
+	.name = "g719",
+	.exts = "g719",
+	.format = AST_FORMAT_G719,
+	.write = g719write,
+	.seek = g719seek,
+	.trunc = g719trunc,
+	.tell = g719tell,
+	.read = g719read,
+	.buf_size = BUF_SIZE + AST_FRIENDLY_OFFSET,
+};
+
+static int load_module(void)
+{
+	if (ast_format_register(&g719_f))
+		return AST_MODULE_LOAD_DECLINE;
+
+	return AST_MODULE_LOAD_SUCCESS;
+}
+
+static int unload_module(void)
+{
+	return ast_format_unregister(g719_f.name);
+}	
+
+AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER,"ITU G.719",
+	.load = load_module,
+	.unload = unload_module,
+	.load_pri = 10,
+);
+