198 lines
5.8 KiB
C
198 lines
5.8 KiB
C
|
/*
|
||
|
* iLBC decoder/encoder stub
|
||
|
* Copyright (c) 2012 Martin Storsjo
|
||
|
*
|
||
|
* This file is part of FFmpeg.
|
||
|
*
|
||
|
* FFmpeg 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.
|
||
|
*
|
||
|
* FFmpeg 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 FFmpeg; if not, write to the Free Software
|
||
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
||
|
*/
|
||
|
|
||
|
#include <ilbc.h>
|
||
|
|
||
|
#include "libavutil/channel_layout.h"
|
||
|
#include "libavutil/common.h"
|
||
|
#include "libavutil/opt.h"
|
||
|
#include "avcodec.h"
|
||
|
#include "internal.h"
|
||
|
|
||
|
static int get_mode(AVCodecContext *avctx)
|
||
|
{
|
||
|
if (avctx->block_align == 38)
|
||
|
return 20;
|
||
|
else if (avctx->block_align == 50)
|
||
|
return 30;
|
||
|
else if (avctx->bit_rate > 0)
|
||
|
return avctx->bit_rate <= 14000 ? 30 : 20;
|
||
|
else
|
||
|
return -1;
|
||
|
}
|
||
|
|
||
|
typedef struct ILBCDecContext {
|
||
|
const AVClass *class;
|
||
|
iLBC_Dec_Inst_t decoder;
|
||
|
int enhance;
|
||
|
} ILBCDecContext;
|
||
|
|
||
|
static const AVOption ilbc_dec_options[] = {
|
||
|
{ "enhance", "Enhance the decoded audio (adds delay)", offsetof(ILBCDecContext, enhance), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_DECODING_PARAM },
|
||
|
{ NULL }
|
||
|
};
|
||
|
|
||
|
static const AVClass ilbc_dec_class = {
|
||
|
.class_name = "libilbc",
|
||
|
.item_name = av_default_item_name,
|
||
|
.option = ilbc_dec_options,
|
||
|
.version = LIBAVUTIL_VERSION_INT,
|
||
|
};
|
||
|
|
||
|
static av_cold int ilbc_decode_init(AVCodecContext *avctx)
|
||
|
{
|
||
|
ILBCDecContext *s = avctx->priv_data;
|
||
|
int mode;
|
||
|
|
||
|
if ((mode = get_mode(avctx)) < 0) {
|
||
|
av_log(avctx, AV_LOG_ERROR, "iLBC frame mode not indicated\n");
|
||
|
return AVERROR(EINVAL);
|
||
|
}
|
||
|
|
||
|
WebRtcIlbcfix_InitDecode(&s->decoder, mode, s->enhance);
|
||
|
|
||
|
avctx->channels = 1;
|
||
|
avctx->channel_layout = AV_CH_LAYOUT_MONO;
|
||
|
avctx->sample_rate = 8000;
|
||
|
avctx->sample_fmt = AV_SAMPLE_FMT_S16;
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static int ilbc_decode_frame(AVCodecContext *avctx, void *data,
|
||
|
int *got_frame_ptr, AVPacket *avpkt)
|
||
|
{
|
||
|
const uint8_t *buf = avpkt->data;
|
||
|
int buf_size = avpkt->size;
|
||
|
ILBCDecContext *s = avctx->priv_data;
|
||
|
AVFrame *frame = data;
|
||
|
int ret;
|
||
|
|
||
|
if (s->decoder.no_of_bytes > buf_size) {
|
||
|
av_log(avctx, AV_LOG_ERROR, "iLBC frame too short (%u, should be %u)\n",
|
||
|
buf_size, s->decoder.no_of_bytes);
|
||
|
return AVERROR_INVALIDDATA;
|
||
|
}
|
||
|
|
||
|
frame->nb_samples = s->decoder.blockl;
|
||
|
if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
|
||
|
return ret;
|
||
|
|
||
|
WebRtcIlbcfix_DecodeImpl((int16_t *) frame->data[0], (const uint16_t *) buf, &s->decoder, 1);
|
||
|
|
||
|
*got_frame_ptr = 1;
|
||
|
|
||
|
return s->decoder.no_of_bytes;
|
||
|
}
|
||
|
|
||
|
AVCodec ff_libilbc_decoder = {
|
||
|
.name = "libilbc",
|
||
|
.long_name = NULL_IF_CONFIG_SMALL("iLBC (Internet Low Bitrate Codec)"),
|
||
|
.type = AVMEDIA_TYPE_AUDIO,
|
||
|
.id = AV_CODEC_ID_ILBC,
|
||
|
.priv_data_size = sizeof(ILBCDecContext),
|
||
|
.init = ilbc_decode_init,
|
||
|
.decode = ilbc_decode_frame,
|
||
|
.capabilities = AV_CODEC_CAP_DR1,
|
||
|
.priv_class = &ilbc_dec_class,
|
||
|
};
|
||
|
|
||
|
typedef struct ILBCEncContext {
|
||
|
const AVClass *class;
|
||
|
iLBC_Enc_Inst_t encoder;
|
||
|
int mode;
|
||
|
} ILBCEncContext;
|
||
|
|
||
|
static const AVOption ilbc_enc_options[] = {
|
||
|
{ "mode", "iLBC mode (20 or 30 ms frames)", offsetof(ILBCEncContext, mode), AV_OPT_TYPE_INT, { .i64 = 20 }, 20, 30, AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM },
|
||
|
{ NULL }
|
||
|
};
|
||
|
|
||
|
static const AVClass ilbc_enc_class = {
|
||
|
.class_name = "libilbc",
|
||
|
.item_name = av_default_item_name,
|
||
|
.option = ilbc_enc_options,
|
||
|
.version = LIBAVUTIL_VERSION_INT,
|
||
|
};
|
||
|
|
||
|
static av_cold int ilbc_encode_init(AVCodecContext *avctx)
|
||
|
{
|
||
|
ILBCEncContext *s = avctx->priv_data;
|
||
|
int mode;
|
||
|
|
||
|
if (avctx->sample_rate != 8000) {
|
||
|
av_log(avctx, AV_LOG_ERROR, "Only 8000Hz sample rate supported\n");
|
||
|
return AVERROR(EINVAL);
|
||
|
}
|
||
|
|
||
|
if (avctx->channels != 1) {
|
||
|
av_log(avctx, AV_LOG_ERROR, "Only mono supported\n");
|
||
|
return AVERROR(EINVAL);
|
||
|
}
|
||
|
|
||
|
if ((mode = get_mode(avctx)) > 0)
|
||
|
s->mode = mode;
|
||
|
else
|
||
|
s->mode = s->mode != 30 ? 20 : 30;
|
||
|
WebRtcIlbcfix_InitEncode(&s->encoder, s->mode);
|
||
|
|
||
|
avctx->block_align = s->encoder.no_of_bytes;
|
||
|
avctx->frame_size = s->encoder.blockl;
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static int ilbc_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
|
||
|
const AVFrame *frame, int *got_packet_ptr)
|
||
|
{
|
||
|
ILBCEncContext *s = avctx->priv_data;
|
||
|
int ret;
|
||
|
|
||
|
if ((ret = ff_alloc_packet2(avctx, avpkt, 50, 0)) < 0)
|
||
|
return ret;
|
||
|
|
||
|
WebRtcIlbcfix_EncodeImpl((uint16_t *) avpkt->data, (const int16_t *) frame->data[0], &s->encoder);
|
||
|
|
||
|
avpkt->size = s->encoder.no_of_bytes;
|
||
|
*got_packet_ptr = 1;
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static const AVCodecDefault ilbc_encode_defaults[] = {
|
||
|
{ "b", "0" },
|
||
|
{ NULL }
|
||
|
};
|
||
|
|
||
|
AVCodec ff_libilbc_encoder = {
|
||
|
.name = "libilbc",
|
||
|
.long_name = NULL_IF_CONFIG_SMALL("iLBC (Internet Low Bitrate Codec)"),
|
||
|
.type = AVMEDIA_TYPE_AUDIO,
|
||
|
.id = AV_CODEC_ID_ILBC,
|
||
|
.priv_data_size = sizeof(ILBCEncContext),
|
||
|
.init = ilbc_encode_init,
|
||
|
.encode2 = ilbc_encode_frame,
|
||
|
.sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16,
|
||
|
AV_SAMPLE_FMT_NONE },
|
||
|
.defaults = ilbc_encode_defaults,
|
||
|
.priv_class = &ilbc_enc_class,
|
||
|
.wrapper_name = "libbilbc",
|
||
|
};
|