yading@10: /*
yading@10:  * iLBC decoder/encoder stub
yading@10:  * Copyright (c) 2012 Martin Storsjo
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: #include <ilbc.h>
yading@10: 
yading@10: #include "libavutil/channel_layout.h"
yading@10: #include "libavutil/common.h"
yading@10: #include "libavutil/opt.h"
yading@10: #include "avcodec.h"
yading@10: #include "internal.h"
yading@10: 
yading@10: static int get_mode(AVCodecContext *avctx)
yading@10: {
yading@10:     if (avctx->block_align == 38)
yading@10:         return 20;
yading@10:     else if (avctx->block_align == 50)
yading@10:         return 30;
yading@10:     else if (avctx->bit_rate > 0)
yading@10:         return avctx->bit_rate <= 14000 ? 30 : 20;
yading@10:     else
yading@10:         return -1;
yading@10: }
yading@10: 
yading@10: typedef struct ILBCDecContext {
yading@10:     const AVClass *class;
yading@10:     iLBC_Dec_Inst_t decoder;
yading@10:     int enhance;
yading@10: } ILBCDecContext;
yading@10: 
yading@10: static const AVOption ilbc_dec_options[] = {
yading@10:     { "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 },
yading@10:     { NULL }
yading@10: };
yading@10: 
yading@10: static const AVClass ilbc_dec_class = {
yading@10:     .class_name = "libilbc",
yading@10:     .item_name  = av_default_item_name,
yading@10:     .option     = ilbc_dec_options,
yading@10:     .version    = LIBAVUTIL_VERSION_INT,
yading@10: };
yading@10: 
yading@10: static av_cold int ilbc_decode_init(AVCodecContext *avctx)
yading@10: {
yading@10:     ILBCDecContext *s  = avctx->priv_data;
yading@10:     int mode;
yading@10: 
yading@10:     if ((mode = get_mode(avctx)) < 0) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "iLBC frame mode not indicated\n");
yading@10:         return AVERROR(EINVAL);
yading@10:     }
yading@10: 
yading@10:     WebRtcIlbcfix_InitDecode(&s->decoder, mode, s->enhance);
yading@10: 
yading@10:     avctx->channels       = 1;
yading@10:     avctx->channel_layout = AV_CH_LAYOUT_MONO;
yading@10:     avctx->sample_rate    = 8000;
yading@10:     avctx->sample_fmt     = AV_SAMPLE_FMT_S16;
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int ilbc_decode_frame(AVCodecContext *avctx, void *data,
yading@10:                              int *got_frame_ptr, AVPacket *avpkt)
yading@10: {
yading@10:     const uint8_t *buf = avpkt->data;
yading@10:     int buf_size       = avpkt->size;
yading@10:     ILBCDecContext *s  = avctx->priv_data;
yading@10:     AVFrame *frame     = data;
yading@10:     int ret;
yading@10: 
yading@10:     if (s->decoder.no_of_bytes > buf_size) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "iLBC frame too short (%u, should be %u)\n",
yading@10:                buf_size, s->decoder.no_of_bytes);
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10: 
yading@10:     frame->nb_samples = s->decoder.blockl;
yading@10:     if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
yading@10:         return ret;
yading@10: 
yading@10:     WebRtcIlbcfix_DecodeImpl((WebRtc_Word16*) frame->data[0],
yading@10:                              (const WebRtc_UWord16*) buf, &s->decoder, 1);
yading@10: 
yading@10:     *got_frame_ptr = 1;
yading@10: 
yading@10:     return s->decoder.no_of_bytes;
yading@10: }
yading@10: 
yading@10: AVCodec ff_libilbc_decoder = {
yading@10:     .name           = "libilbc",
yading@10:     .type           = AVMEDIA_TYPE_AUDIO,
yading@10:     .id             = AV_CODEC_ID_ILBC,
yading@10:     .priv_data_size = sizeof(ILBCDecContext),
yading@10:     .init           = ilbc_decode_init,
yading@10:     .decode         = ilbc_decode_frame,
yading@10:     .capabilities   = CODEC_CAP_DR1,
yading@10:     .long_name      = NULL_IF_CONFIG_SMALL("iLBC (Internet Low Bitrate Codec)"),
yading@10:     .priv_class     = &ilbc_dec_class,
yading@10: };
yading@10: 
yading@10: typedef struct ILBCEncContext {
yading@10:     const AVClass *class;
yading@10:     iLBC_Enc_Inst_t encoder;
yading@10:     int mode;
yading@10: } ILBCEncContext;
yading@10: 
yading@10: static const AVOption ilbc_enc_options[] = {
yading@10:     { "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 },
yading@10:     { NULL }
yading@10: };
yading@10: 
yading@10: static const AVClass ilbc_enc_class = {
yading@10:     .class_name = "libilbc",
yading@10:     .item_name  = av_default_item_name,
yading@10:     .option     = ilbc_enc_options,
yading@10:     .version    = LIBAVUTIL_VERSION_INT,
yading@10: };
yading@10: 
yading@10: static av_cold int ilbc_encode_init(AVCodecContext *avctx)
yading@10: {
yading@10:     ILBCEncContext *s = avctx->priv_data;
yading@10:     int mode;
yading@10: 
yading@10:     if (avctx->sample_rate != 8000) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "Only 8000Hz sample rate supported\n");
yading@10:         return AVERROR(EINVAL);
yading@10:     }
yading@10: 
yading@10:     if (avctx->channels != 1) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "Only mono supported\n");
yading@10:         return AVERROR(EINVAL);
yading@10:     }
yading@10: 
yading@10:     if ((mode = get_mode(avctx)) > 0)
yading@10:         s->mode = mode;
yading@10:     else
yading@10:         s->mode = s->mode != 30 ? 20 : 30;
yading@10:     WebRtcIlbcfix_InitEncode(&s->encoder, s->mode);
yading@10: 
yading@10:     avctx->block_align = s->encoder.no_of_bytes;
yading@10:     avctx->frame_size  = s->encoder.blockl;
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int ilbc_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
yading@10:                              const AVFrame *frame, int *got_packet_ptr)
yading@10: {
yading@10:     ILBCEncContext *s = avctx->priv_data;
yading@10:     int ret;
yading@10: 
yading@10:     if ((ret = ff_alloc_packet2(avctx, avpkt, 50)) < 0)
yading@10:         return ret;
yading@10: 
yading@10:     WebRtcIlbcfix_EncodeImpl((WebRtc_UWord16*) avpkt->data, (const WebRtc_Word16*) frame->data[0], &s->encoder);
yading@10: 
yading@10:     avpkt->size     = s->encoder.no_of_bytes;
yading@10:     *got_packet_ptr = 1;
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static const AVCodecDefault ilbc_encode_defaults[] = {
yading@10:     { "b", "0" },
yading@10:     { NULL }
yading@10: };
yading@10: 
yading@10: AVCodec ff_libilbc_encoder = {
yading@10:     .name           = "libilbc",
yading@10:     .type           = AVMEDIA_TYPE_AUDIO,
yading@10:     .id             = AV_CODEC_ID_ILBC,
yading@10:     .priv_data_size = sizeof(ILBCEncContext),
yading@10:     .init           = ilbc_encode_init,
yading@10:     .encode2        = ilbc_encode_frame,
yading@10:     .sample_fmts    = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16,
yading@10:                                                      AV_SAMPLE_FMT_NONE },
yading@10:     .long_name      = NULL_IF_CONFIG_SMALL("iLBC (Internet Low Bitrate Codec)"),
yading@10:     .defaults       = ilbc_encode_defaults,
yading@10:     .priv_class     = &ilbc_enc_class,
yading@10: };