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