Add codec G.722 support.

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@48661 65c4cc65-6c06-0410-ace0-fbb531ad65f3

codecs/codec_g722.c

@@ -0,0 +1,219 @@
+/*
+ * Asterisk -- An open source telephony toolkit.
+ *
+ * Copyright (C) 1999 - 2006, Digium, Inc.
+ *
+ * Matthew Fredrickson <creslin@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 codec_g722.c - translate between signed linear and ITU G.722-64kbps
+ *
+ * \ingroup codecs
+ */
+
+#include "asterisk.h"
+
+ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
+
+#include <fcntl.h>
+#include <netinet/in.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "asterisk/lock.h"
+#include "asterisk/logger.h"
+#include "asterisk/linkedlists.h"
+#include "asterisk/module.h"
+#include "asterisk/config.h"
+#include "asterisk/options.h"
+#include "asterisk/translate.h"
+#include "asterisk/channel.h"
+#include "asterisk/utils.h"
+
+#define BUFFER_SAMPLES   8096	/* size for the translation buffers */
+#define BUF_SHIFT	5
+
+/* Sample frame data */
+
+#include "g722/g722.h"
+#include "slin_g722_ex.h"
+#include "g722_slin_ex.h"
+
+struct g722_encoder_pvt {
+	g722_encode_state_t g722;
+};
+
+struct g722_decoder_pvt {
+	g722_decode_state_t g722;
+};
+
+/*! \brief init a new instance of g722_encoder_pvt. */
+static int lintog722_new(struct ast_trans_pvt *pvt)
+{
+	struct g722_encoder_pvt *tmp = pvt->pvt;
+
+	g722_encode_init(&tmp->g722, 64000, G722_SAMPLE_RATE_8000);
+
+	return 0;
+}
+
+/*! \brief init a new instance of g722_encoder_pvt. */
+static int g722tolin_new(struct ast_trans_pvt *pvt)
+{
+	struct g722_decoder_pvt *tmp = pvt->pvt;
+
+	g722_decode_init(&tmp->g722, 64000, G722_SAMPLE_RATE_8000);
+
+	return 0;
+}
+
+static int g722tolin_framein(struct ast_trans_pvt *pvt, struct ast_frame *f)
+{
+	struct g722_decoder_pvt *tmp = pvt->pvt;
+	unsigned char *src = f->data;
+	int16_t *dst = (int16_t *) pvt->outbuf + pvt->samples;
+
+	g722_decode(&tmp->g722, dst, src, f->samples);
+	pvt->samples += f->samples;
+	pvt->datalen += 2 * f->samples;
+
+	return 0;
+}
+
+static int lintog722_framein(struct ast_trans_pvt *pvt, struct ast_frame *f)
+{
+	struct g722_encoder_pvt *tmp = pvt->pvt;
+	int16_t *src = f->data;
+
+	g722_encode(&tmp->g722, &pvt->outbuf[pvt->datalen], src, f->samples);
+	/* Since G.722 64kbps per second is one bye per sample, all of these
+	   calculations are easy */
+	pvt->samples += f->samples;
+	pvt->datalen += f->samples;
+
+	return 0;
+}
+
+static struct ast_frame *g722tolin_sample(void)
+{
+	static struct ast_frame f = {
+		.frametype = AST_FRAME_VOICE,
+		.subclass = AST_FORMAT_G722,
+		.datalen = sizeof(g722_slin_ex),
+		.samples = sizeof(g722_slin_ex),
+		.src = __PRETTY_FUNCTION__,
+		.data = g722_slin_ex,
+	};
+
+	return &f;
+}
+
+static struct ast_frame *lintog722_sample (void)
+{
+	static struct ast_frame f = {
+		.frametype = AST_FRAME_VOICE,
+		.subclass = AST_FORMAT_SLINEAR,
+		.datalen = sizeof(slin_g722_ex),
+		.samples = sizeof(slin_g722_ex),
+		.src = __PRETTY_FUNCTION__,
+		.data = slin_g722_ex,
+	};
+
+	return &f;
+}
+
+static struct ast_translator g722tolin = {
+	.name = "g722tolin",
+	.srcfmt = AST_FORMAT_G722,
+	.dstfmt = AST_FORMAT_SLINEAR,
+	.newpvt = g722tolin_new,	/* same for both directions */
+	.framein = g722tolin_framein,
+	.sample = g722tolin_sample,
+	.desc_size = sizeof(struct g722_decoder_pvt),
+	.buffer_samples = BUFFER_SAMPLES,
+	.buf_size = BUFFER_SAMPLES,
+	.plc_samples = 160,
+};
+
+static struct ast_translator lintog722 = {
+	.name = "lintog722",
+	.srcfmt = AST_FORMAT_SLINEAR,
+	.dstfmt = AST_FORMAT_G722,
+	.newpvt = lintog722_new,	/* same for both directions */
+	.framein = lintog722_framein,
+	.sample = lintog722_sample,
+	.desc_size = sizeof(struct g722_encoder_pvt),
+	.buffer_samples = BUFFER_SAMPLES,
+	.buf_size = BUFFER_SAMPLES,
+};
+
+static void parse_config(void)
+{
+	struct ast_variable *var;
+	struct ast_config *cfg = ast_config_load("codecs.conf");
+
+	if (!cfg)
+		return;
+	for (var = ast_variable_browse(cfg, "plc"); var; var = var->next) {
+		if (!strcasecmp(var->name, "genericplc")) {
+			g722tolin.useplc = ast_true(var->value) ? 1 : 0;
+			if (option_verbose > 2)
+				ast_verbose(VERBOSE_PREFIX_3 "codec_g722: %susing generic PLC\n",
+					g722tolin.useplc ? "" : "not ");
+		}
+	}
+	ast_config_destroy(cfg);
+}
+
+static int reload(void)
+{
+	parse_config();
+
+	return 0;
+}
+
+static int unload_module(void)
+{
+	int res = 0;
+
+	res |= ast_unregister_translator(&g722tolin);
+	res |= ast_unregister_translator(&lintog722);
+
+	return res;
+}
+
+static int load_module(void)
+{
+	int res = 0;
+
+
+	parse_config();
+
+	res |= ast_register_translator(&g722tolin);
+	res |= ast_register_translator(&lintog722);
+
+	if (res)
+		unload_module();
+
+	return res;
+}
+
+AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_DEFAULT, "ITU G.722-64kbps G722 Transcoder",
+		.load = load_module,
+		.unload = unload_module,
+		.reload = reload,
+	       );