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/*

 * 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 

#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((WebRtc_Word16*) frame->data[0],

                             (const WebRtc_UWord16*) 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   = 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)

        return ret;

    WebRtcIlbcfix_EncodeImpl((WebRtc_UWord16*) avpkt->data, (const WebRtc_Word16*) 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,

};