/* * iLBC decoder/encoder stub * Copyright (c) 2012 Martin Storsjo * * This file is part of Libav. * * Libav 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. * * Libav 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 Libav; 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 = { "libilbc", av_default_item_name, ilbc_dec_options, 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) { av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); 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 = 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 = { "libilbc", av_default_item_name, ilbc_enc_options, 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_packet(avpkt, 50))) { av_log(avctx, AV_LOG_ERROR, "Error getting output packet\n"); 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, };