| 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 | |
| 30 | static 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 | |
| 42 | typedef struct ILBCDecContext { |
| 43 | const AVClass *class; |
| 44 | iLBC_Dec_Inst_t decoder; |
| 45 | int enhance; |
| 46 | } ILBCDecContext; |
| 47 | |
| 48 | static 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 | |
| 53 | static 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 | |
| 60 | static 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 | |
| 80 | static 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 | |
| 106 | AVCodec 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 | |
| 118 | typedef struct ILBCEncContext { |
| 119 | const AVClass *class; |
| 120 | iLBC_Enc_Inst_t encoder; |
| 121 | int mode; |
| 122 | } ILBCEncContext; |
| 123 | |
| 124 | static 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 | |
| 129 | static 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 | |
| 136 | static 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 | |
| 163 | static 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 | |
| 179 | static const AVCodecDefault ilbc_encode_defaults[] = { |
| 180 | { "b", "0" }, |
| 181 | { NULL } |
| 182 | }; |
| 183 | |
| 184 | AVCodec 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 | }; |