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/* opusdecode.c
* opus 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 <stdlib.h>
#include "opus/opus.h"
#include "wsutil/codecs.h"
#include "ws_attributes.h"
void codec_register_opus(void);
static void *
codec_opus_init(codec_context_t *ctx _U_)
{
OpusDecoder *state;
int err = OPUS_INTERNAL_ERROR;
/* Opus has in-band signaling and can convert what is sent to our
* desired output.
* always use maximum 48000 to cover all 8k/12k/16k/24k/48k
* always downmix to mono because RTP Player only supports mono now
*/
state = opus_decoder_create(48000, 1, &err);
return state;
}
static void
codec_opus_release(codec_context_t *ctx)
{
OpusDecoder* state = (OpusDecoder*)ctx->priv;
if (!state) {
return; /* out-of-memory; */
}
opus_decoder_destroy(state);
}
static unsigned
codec_opus_get_channels(codec_context_t *ctx _U_)
{
return 1;
}
static unsigned
codec_opus_get_frequency(codec_context_t *ctx _U_)
{
/* although can set kinds of fs, but we set 48K now */
return 48000;
}
static size_t
codec_opus_decode(codec_context_t *ctx,
const void *input, size_t inputSizeBytes,
void *output, size_t *outputSizeBytes)
{
OpusDecoder *state = (OpusDecoder *)ctx->priv;
if (!state) {
return 0; /* out-of-memory */
}
const unsigned char *data = (const unsigned char *)input;
opus_int32 len = (opus_int32)inputSizeBytes;
int frame_samples = opus_decoder_get_nb_samples(state, data, len);
if (frame_samples < 0) { // OPUS_INVALID_PACKET
return 0;
}
// reserve space for the first time
if (!output || !outputSizeBytes) {
return frame_samples*2;
}
opus_int16 *pcm = (opus_int16*)(output);
int ret = opus_decode(state, data, len, pcm, frame_samples, 0);
if (ret < 0) {
return 0;
}
*outputSizeBytes = ret * 2;
return *outputSizeBytes;
}
void
codec_register_opus(void)
{
register_codec("opus", codec_opus_init, codec_opus_release,
codec_opus_get_channels, codec_opus_get_frequency, codec_opus_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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