32 lines
683 B
C++
32 lines
683 B
C++
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
// Copyright The Music Player Daemon Project
|
|
|
|
#include "OpusHead.hxx"
|
|
#include "util/ByteOrder.hxx"
|
|
|
|
#include <cstdint>
|
|
|
|
struct OpusHead {
|
|
char signature[8];
|
|
uint8_t version, channels;
|
|
uint16_t pre_skip;
|
|
uint32_t sample_rate;
|
|
uint16_t output_gain;
|
|
uint8_t channel_mapping;
|
|
};
|
|
|
|
bool
|
|
ScanOpusHeader(const void *data, size_t size, unsigned &channels_r,
|
|
signed &output_gain_r, unsigned &pre_skip_r)
|
|
{
|
|
const auto *h = (const OpusHead *)data;
|
|
if (size < 19 || (h->version & 0xf0) != 0)
|
|
return false;
|
|
|
|
output_gain_r = FromLE16S(h->output_gain);
|
|
|
|
channels_r = h->channels;
|
|
pre_skip_r = FromLE16(h->pre_skip);
|
|
return true;
|
|
}
|