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/* -*- Mode: C; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/*
Copyright (C) 2013 Jeremy White <jwhite@codeweavers.com>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#ifndef _H_SND_CODEC
#define _H_SND_CODEC
#if HAVE_CELT051
#include <celt051/celt.h>
#endif
#if HAVE_OPUS
#include <opus.h>
#endif
/* Spice uses a very fixed protocol when transmitting CELT audio;
audio must be transmitted in frames of 256, and we must compress
data down to a fairly specific size (47, computation below).
While the protocol doesn't inherently specify this, the expectation
of older clients and server mandates it.
*/
#define SND_CODEC_CELT_FRAME_SIZE 256
#define SND_CODEC_CELT_BIT_RATE (64 * 1024)
#define SND_CODEC_CELT_PLAYBACK_FREQ 44100
#define SND_CODEC_CELT_COMPRESSED_FRAME_BYTES (SND_CODEC_CELT_FRAME_SIZE * SND_CODEC_CELT_BIT_RATE / \
SND_CODEC_CELT_PLAYBACK_FREQ / 8)
#define SND_CODEC_OPUS_FRAME_SIZE 480
#define SND_CODEC_OPUS_PLAYBACK_FREQ 48000
#define SND_CODEC_OPUS_COMPRESSED_FRAME_BYTES 480
#define SND_CODEC_PLAYBACK_CHAN 2
#define SND_CODEC_MAX_FRAME_SIZE (MAX(SND_CODEC_CELT_FRAME_SIZE, SND_CODEC_OPUS_FRAME_SIZE))
#define SND_CODEC_MAX_FRAME_BYTES (SND_CODEC_MAX_FRAME_SIZE * SND_CODEC_PLAYBACK_CHAN * 2 /* FMT_S16 */)
#define SND_CODEC_MAX_COMPRESSED_BYTES MAX(SND_CODEC_CELT_COMPRESSED_FRAME_BYTES, SND_CODEC_OPUS_COMPRESSED_FRAME_BYTES)
#define SND_CODEC_ANY_FREQUENCY -1
#define SND_CODEC_OK 0
#define SND_CODEC_UNAVAILABLE 1
#define SND_CODEC_ENCODER_UNAVAILABLE 2
#define SND_CODEC_DECODER_UNAVAILABLE 3
#define SND_CODEC_ENCODE_FAILED 4
#define SND_CODEC_DECODE_FAILED 5
#define SND_CODEC_INVALID_ENCODE_SIZE 6
#define SND_CODEC_ENCODE 0x0001
#define SND_CODEC_DECODE 0x0002
SPICE_BEGIN_DECLS
typedef struct SndCodecInternal * SndCodec;
int snd_codec_is_capable(int mode, int frequency);
int snd_codec_create(SndCodec *codec, int mode, int frequency, int purpose);
void snd_codec_destroy(SndCodec *codec);
int snd_codec_frame_size(SndCodec codec);
int snd_codec_encode(SndCodec codec, uint8_t *in_ptr, int in_size, uint8_t *out_ptr, int *out_size);
int snd_codec_decode(SndCodec codec, uint8_t *in_ptr, int in_size, uint8_t *out_ptr, int *out_size);
SPICE_END_DECLS
#endif
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