1/* 2 * iLBC decoder/encoder stub 3 * Copyright (c) 2012 Martin Storsjo 4 * 5 * This file is part of FFmpeg. 6 * 7 * FFmpeg is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Lesser General Public 9 * License as published by the Free Software Foundation; either 10 * version 2.1 of the License, or (at your option) any later version. 11 * 12 * FFmpeg is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * Lesser General Public License for more details. 16 * 17 * You should have received a copy of the GNU Lesser General Public 18 * License along with FFmpeg; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 20 */ 21 22#include <ilbc.h> 23 24#include "libavutil/channel_layout.h" 25#include "libavutil/common.h" 26#include "libavutil/opt.h" 27#include "avcodec.h" 28#include "internal.h" 29 30static int get_mode(AVCodecContext *avctx) 31{ 32 if (avctx->block_align == 38) 33 return 20; 34 else if (avctx->block_align == 50) 35 return 30; 36 else if (avctx->bit_rate > 0) 37 return avctx->bit_rate <= 14000 ? 30 : 20; 38 else 39 return -1; 40} 41 42typedef struct ILBCDecContext { 43 const AVClass *class; 44 iLBC_Dec_Inst_t decoder; 45 int enhance; 46} ILBCDecContext; 47 48static const AVOption ilbc_dec_options[] = { 49 { "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 }, 50 { NULL } 51}; 52 53static const AVClass ilbc_dec_class = { 54 .class_name = "libilbc", 55 .item_name = av_default_item_name, 56 .option = ilbc_dec_options, 57 .version = LIBAVUTIL_VERSION_INT, 58}; 59 60static av_cold int ilbc_decode_init(AVCodecContext *avctx) 61{ 62 ILBCDecContext *s = avctx->priv_data; 63 int mode; 64 65 if ((mode = get_mode(avctx)) < 0) { 66 av_log(avctx, AV_LOG_ERROR, "iLBC frame mode not indicated\n"); 67 return AVERROR(EINVAL); 68 } 69 70 WebRtcIlbcfix_InitDecode(&s->decoder, mode, s->enhance); 71 72 avctx->channels = 1; 73 avctx->channel_layout = AV_CH_LAYOUT_MONO; 74 avctx->sample_rate = 8000; 75 avctx->sample_fmt = AV_SAMPLE_FMT_S16; 76 77 return 0; 78} 79 80static int ilbc_decode_frame(AVCodecContext *avctx, void *data, 81 int *got_frame_ptr, AVPacket *avpkt) 82{ 83 const uint8_t *buf = avpkt->data; 84 int buf_size = avpkt->size; 85 ILBCDecContext *s = avctx->priv_data; 86 AVFrame *frame = data; 87 int ret; 88 89 if (s->decoder.no_of_bytes > buf_size) { 90 av_log(avctx, AV_LOG_ERROR, "iLBC frame too short (%u, should be %u)\n", 91 buf_size, s->decoder.no_of_bytes); 92 return AVERROR_INVALIDDATA; 93 } 94 95 frame->nb_samples = s->decoder.blockl; 96 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) 97 return ret; 98 99 WebRtcIlbcfix_DecodeImpl((int16_t *) frame->data[0], (const uint16_t *) buf, &s->decoder, 1); 100 101 *got_frame_ptr = 1; 102 103 return s->decoder.no_of_bytes; 104} 105 106AVCodec ff_libilbc_decoder = { 107 .name = "libilbc", 108 .long_name = NULL_IF_CONFIG_SMALL("iLBC (Internet Low Bitrate Codec)"), 109 .type = AVMEDIA_TYPE_AUDIO, 110 .id = AV_CODEC_ID_ILBC, 111 .priv_data_size = sizeof(ILBCDecContext), 112 .init = ilbc_decode_init, 113 .decode = ilbc_decode_frame, 114 .capabilities = CODEC_CAP_DR1, 115 .priv_class = &ilbc_dec_class, 116}; 117 118typedef struct ILBCEncContext { 119 const AVClass *class; 120 iLBC_Enc_Inst_t encoder; 121 int mode; 122} ILBCEncContext; 123 124static const AVOption ilbc_enc_options[] = { 125 { "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 }, 126 { NULL } 127}; 128 129static const AVClass ilbc_enc_class = { 130 .class_name = "libilbc", 131 .item_name = av_default_item_name, 132 .option = ilbc_enc_options, 133 .version = LIBAVUTIL_VERSION_INT, 134}; 135 136static av_cold int ilbc_encode_init(AVCodecContext *avctx) 137{ 138 ILBCEncContext *s = avctx->priv_data; 139 int mode; 140 141 if (avctx->sample_rate != 8000) { 142 av_log(avctx, AV_LOG_ERROR, "Only 8000Hz sample rate supported\n"); 143 return AVERROR(EINVAL); 144 } 145 146 if (avctx->channels != 1) { 147 av_log(avctx, AV_LOG_ERROR, "Only mono supported\n"); 148 return AVERROR(EINVAL); 149 } 150 151 if ((mode = get_mode(avctx)) > 0) 152 s->mode = mode; 153 else 154 s->mode = s->mode != 30 ? 20 : 30; 155 WebRtcIlbcfix_InitEncode(&s->encoder, s->mode); 156 157 avctx->block_align = s->encoder.no_of_bytes; 158 avctx->frame_size = s->encoder.blockl; 159 160 return 0; 161} 162 163static int ilbc_encode_frame(AVCodecContext *avctx, AVPacket *avpkt, 164 const AVFrame *frame, int *got_packet_ptr) 165{ 166 ILBCEncContext *s = avctx->priv_data; 167 int ret; 168 169 if ((ret = ff_alloc_packet2(avctx, avpkt, 50)) < 0) 170 return ret; 171 172 WebRtcIlbcfix_EncodeImpl((uint16_t *) avpkt->data, (const int16_t *) frame->data[0], &s->encoder); 173 174 avpkt->size = s->encoder.no_of_bytes; 175 *got_packet_ptr = 1; 176 return 0; 177} 178 179static const AVCodecDefault ilbc_encode_defaults[] = { 180 { "b", "0" }, 181 { NULL } 182}; 183 184AVCodec ff_libilbc_encoder = { 185 .name = "libilbc", 186 .long_name = NULL_IF_CONFIG_SMALL("iLBC (Internet Low Bitrate Codec)"), 187 .type = AVMEDIA_TYPE_AUDIO, 188 .id = AV_CODEC_ID_ILBC, 189 .priv_data_size = sizeof(ILBCEncContext), 190 .init = ilbc_encode_init, 191 .encode2 = ilbc_encode_frame, 192 .sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16, 193 AV_SAMPLE_FMT_NONE }, 194 .defaults = ilbc_encode_defaults, 195 .priv_class = &ilbc_enc_class, 196}; 197