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/* -*- Mode: C; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/*
Copyright (C) 2013 Jeremy White
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/>.
*/
/* snd_codec.c
General purpose sound codec routines for use by Spice.
These routines abstract the work of picking a codec and
encoding and decoding the buffers.
See below for documentation of the public routines.
*/
#include "config.h"
#include <stdio.h>
#include <string.h>
#if HAVE_OPUS
#include <opus.h>
#endif
#include <spice/macros.h>
#include <spice/enums.h>
#include "snd_codec.h"
#include "mem.h"
#include "log.h"
typedef struct SndCodecInternal
{
int mode;
int frequency;
#if HAVE_OPUS
OpusEncoder *opus_encoder;
OpusDecoder *opus_decoder;
#endif
} SndCodecInternal;
/* Opus support routines */
#if HAVE_OPUS
static void snd_codec_destroy_opus(SndCodecInternal *codec)
{
if (codec->opus_decoder) {
opus_decoder_destroy(codec->opus_decoder);
codec->opus_decoder = NULL;
}
if (codec->opus_encoder) {
opus_encoder_destroy(codec->opus_encoder);
codec->opus_encoder = NULL;
}
}
static int snd_codec_create_opus(SndCodecInternal *codec, int purpose)
{
int opus_error;
if (purpose & SND_CODEC_ENCODE) {
codec->opus_encoder = opus_encoder_create(codec->frequency,
SND_CODEC_PLAYBACK_CHAN,
OPUS_APPLICATION_AUDIO, &opus_error);
if (! codec->opus_encoder) {
g_warning("create opus encoder failed; error %d", opus_error);
goto error;
}
}
if (purpose & SND_CODEC_DECODE) {
codec->opus_decoder = opus_decoder_create(codec->frequency,
SND_CODEC_PLAYBACK_CHAN, &opus_error);
if (! codec->opus_decoder) {
g_warning("create opus decoder failed; error %d", opus_error);
goto error;
}
}
codec->mode = SPICE_AUDIO_DATA_MODE_OPUS;
return SND_CODEC_OK;
error:
snd_codec_destroy_opus(codec);
return SND_CODEC_UNAVAILABLE;
}
static int snd_codec_encode_opus(SndCodecInternal *codec, uint8_t *in_ptr, int in_size, uint8_t *out_ptr, int *out_size)
{
int n;
if (in_size != SND_CODEC_OPUS_FRAME_SIZE * SND_CODEC_PLAYBACK_CHAN * 2)
return SND_CODEC_INVALID_ENCODE_SIZE;
n = opus_encode(codec->opus_encoder, (opus_int16 *) in_ptr, SND_CODEC_OPUS_FRAME_SIZE, out_ptr, *out_size);
if (n < 0) {
g_warning("opus_encode failed %d", n);
return SND_CODEC_ENCODE_FAILED;
}
*out_size = n;
return SND_CODEC_OK;
}
static int snd_codec_decode_opus(SndCodecInternal *codec, uint8_t *in_ptr, int in_size, uint8_t *out_ptr, int *out_size)
{
int n;
n = opus_decode(codec->opus_decoder, in_ptr, in_size, (opus_int16 *) out_ptr,
*out_size / SND_CODEC_PLAYBACK_CHAN / 2, 0);
if (n < 0) {
g_warning("opus_decode failed %d", n);
return SND_CODEC_DECODE_FAILED;
}
*out_size = n * SND_CODEC_PLAYBACK_CHAN * 2 /* 16 fmt */;
return SND_CODEC_OK;
}
#endif
/*----------------------------------------------------------------------------
** PUBLIC INTERFACE
**--------------------------------------------------------------------------*/
/*
snd_codec_is_capable
Returns TRUE if the current spice implementation can
use the given codec, FALSE otherwise.
mode must be a SPICE_AUDIO_DATA_MODE_XXX enum from spice/enum.h
*/
int snd_codec_is_capable(int mode, int frequency)
{
#if HAVE_OPUS
if (mode == SPICE_AUDIO_DATA_MODE_OPUS &&
(frequency == SND_CODEC_ANY_FREQUENCY ||
frequency == 48000 || frequency == 24000 ||
frequency == 16000 || frequency == 12000 ||
frequency == 8000) )
return TRUE;
#endif
return FALSE;
}
/*
snd_codec_create
Create a codec control. Required for most functions in this library.
Parameters:
1. codec Pointer to preallocated codec control
2. mode SPICE_AUDIO_DATA_MODE_XXX enum from spice/enum.h
3. encode TRUE if encoding is desired
4. decode TRUE if decoding is desired
Returns:
SND_CODEC_OK if all went well; a different code if not.
snd_codec_destroy is the obvious partner of snd_codec_create.
*/
int snd_codec_create(SndCodec *codec, int mode, int frequency, int purpose)
{
int rc = SND_CODEC_UNAVAILABLE;
SndCodecInternal **c = codec;
*c = spice_new0(SndCodecInternal, 1);
(*c)->frequency = frequency;
#if HAVE_OPUS
if (mode == SPICE_AUDIO_DATA_MODE_OPUS)
rc = snd_codec_create_opus(*c, purpose);
#endif
return rc;
}
/*
snd_codec_destroy
The obvious companion to snd_codec_create
*/
void snd_codec_destroy(SndCodec *codec)
{
SndCodecInternal **c = codec;
if (! c || ! *c)
return;
#if HAVE_OPUS
snd_codec_destroy_opus(*c);
#endif
free(*c);
*c = NULL;
}
/*
snd_codec_frame_size
Returns the size, in frames, of the raw PCM frame buffer
required by this codec. To get bytes, you'll need
to multiply by channels and sample width.
*/
int snd_codec_frame_size(SndCodec codec)
{
#if HAVE_OPUS
SndCodecInternal *c = codec;
if (c && c->mode == SPICE_AUDIO_DATA_MODE_OPUS)
return SND_CODEC_OPUS_FRAME_SIZE;
#endif
return SND_CODEC_MAX_FRAME_SIZE;
}
/*
snd_codec_encode
Encode a block of data to a compressed buffer.
Parameters:
1. codec Pointer to codec control previously allocated + created
2. in_ptr Pointer to uncompressed PCM data
3. in_size Input size
4. out_ptr Pointer to area to write encoded data
5. out_size On input, the maximum size of the output buffer; on
successful return, it will hold the number of bytes
returned.
Returns:
SND_CODEC_OK if all went well
*/
int snd_codec_encode(SndCodec codec, uint8_t *in_ptr, int in_size, uint8_t *out_ptr, int *out_size)
{
#if HAVE_OPUS
SndCodecInternal *c = codec;
if (c && c->mode == SPICE_AUDIO_DATA_MODE_OPUS)
return snd_codec_encode_opus(c, in_ptr, in_size, out_ptr, out_size);
#endif
return SND_CODEC_ENCODER_UNAVAILABLE;
}
/*
snd_codec_decode
Decode a block of data from a compressed buffer.
Parameters:
1. codec Pointer to codec control previously allocated + created
2. in_ptr Pointer to compressed data
3. in_size Input size
4. out_ptr Pointer to area to write decoded data
5. out_size On input, the maximum size of the output buffer; on
successful return, it will hold the number of bytes
returned.
Returns:
SND_CODEC_OK if all went well
*/
int snd_codec_decode(SndCodec codec, uint8_t *in_ptr, int in_size, uint8_t *out_ptr, int *out_size)
{
#if HAVE_OPUS
SndCodecInternal *c = codec;
if (c && c->mode == SPICE_AUDIO_DATA_MODE_OPUS)
return snd_codec_decode_opus(c, in_ptr, in_size, out_ptr, out_size);
#endif
return SND_CODEC_DECODER_UNAVAILABLE;
}
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