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/* 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:
*/
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