1 files changed, 99 insertions, 0 deletions
diff --git a/plugins/codecs/G722/G722decode.c b/plugins/codecs/G722/G722decode.c
new file mode 100644
index 00000000..30c46107
--- /dev/null
+++ b/plugins/codecs/G722/G722decode.c
@@ -0,0 +1,99 @@
+/* G722decode.c
+ * G.722 codec
+ *
+ * Wireshark - Network traffic analyzer
+ * By Gerald Combs <gerald@wireshark.org>
+ * Copyright 1998 Gerald Combs
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#include "config.h"
+
+#include <glib.h>
+
+#include "spandsp.h"
+#include "wsutil/codecs.h"
+#include "ws_attributes.h"
+
+void codec_register_g722(void);
+
+static void *
+codec_g722_init(codec_context_t *ctx _U_)
+{
+    g722_decode_state_t *state;
+
+    /* Valid values for bit_rate for G.722 are 48000, 56000, 64000, but RTP/AVP
+     * profile requires 64kbps, aligned at octets. */
+    state = g722_decode_init(NULL, 64000, 0);
+
+    return state;
+}
+
+static void
+codec_g722_release(codec_context_t *ctx)
+{
+    g722_decode_state_t *state = (g722_decode_state_t *)ctx->priv;
+
+    if (!state) {
+        return;  /* out-of-memory; */
+    }
+
+    /* Note: replaces g722_decode_release since SpanDSP 20090211 */
+    g722_decode_free(state);
+}
+
+static unsigned
+codec_g722_get_channels(codec_context_t *ctx _U_)
+{
+    /* G.722 has only one channel. */
+    return 1;
+}
+
+static unsigned
+codec_g722_get_frequency(codec_context_t *ctx _U_)
+{
+    /* Note: RTP Clock rate is 8kHz due to a historic error, but actual sampling
+     * rate is 16kHz (RFC 3551, section 4.5.2). */
+    return 16000;
+}
+
+static size_t
+codec_g722_decode(codec_context_t *ctx, const void *inputBytes,
+        size_t inputBytesSize, void *outputSamples, size_t *outputSamplesSize)
+{
+    g722_decode_state_t *state = (g722_decode_state_t *)ctx->priv;
+
+    if (!state) {
+        return 0;  /* out-of-memory; */
+    }
+
+    if (!outputSamples || !outputSamplesSize) {
+        return 4 * inputBytesSize;
+    }
+
+    /* g722_decode returns the number of 16-bit samples. */
+    *outputSamplesSize = 2 * g722_decode(state, (int16_t *)outputSamples,
+        (const uint8_t *)inputBytes, (int)inputBytesSize);
+    return *outputSamplesSize;
+}
+
+void
+codec_register_g722(void)
+{
+    register_codec("g722", codec_g722_init, codec_g722_release,
+            codec_g722_get_channels, codec_g722_get_frequency, codec_g722_decode);
+}
+
+/*
+ * Editor modelines  -  https://www.wireshark.org/tools/modelines.html
+ *
+ * Local variables:
+ * c-basic-offset: 4
+ * tab-width: 8
+ * indent-tabs-mode: nil
+ * End:
+ *
+ * vi: set shiftwidth=4 tabstop=8 expandtab:
+ * :indentSize=4:tabSize=8:noTabs=true:
+ */