2 * iLBC decoder/encoder stub
3 * Copyright (c) 2012 Martin Storsjo
5 * This file is part of FFmpeg.
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.
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.
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
24 #include "libavutil/channel_layout.h"
25 #include "libavutil/common.h"
26 #include "libavutil/opt.h"
30 static int get_mode(AVCodecContext *avctx)
32 if (avctx->block_align == 38)
34 else if (avctx->block_align == 50)
36 else if (avctx->bit_rate > 0)
37 return avctx->bit_rate <= 14000 ? 30 : 20;
42 typedef struct ILBCDecContext {
44 iLBC_Dec_Inst_t decoder;
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 },
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,
60 static av_cold int ilbc_decode_init(AVCodecContext *avctx)
62 ILBCDecContext *s = avctx->priv_data;
65 if ((mode = get_mode(avctx)) < 0) {
66 av_log(avctx, AV_LOG_ERROR, "iLBC frame mode not indicated\n");
67 return AVERROR(EINVAL);
70 WebRtcIlbcfix_InitDecode(&s->decoder, mode, s->enhance);
73 avctx->channel_layout = AV_CH_LAYOUT_MONO;
74 avctx->sample_rate = 8000;
75 avctx->sample_fmt = AV_SAMPLE_FMT_S16;
80 static int ilbc_decode_frame(AVCodecContext *avctx, void *data,
81 int *got_frame_ptr, AVPacket *avpkt)
83 const uint8_t *buf = avpkt->data;
84 int buf_size = avpkt->size;
85 ILBCDecContext *s = avctx->priv_data;
86 AVFrame *frame = data;
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;
95 frame->nb_samples = s->decoder.blockl;
96 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
99 WebRtcIlbcfix_DecodeImpl((int16_t *) frame->data[0], (const uint16_t *) buf, &s->decoder, 1);
103 return s->decoder.no_of_bytes;
106 AVCodec ff_libilbc_decoder = {
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 = AV_CODEC_CAP_DR1,
115 .priv_class = &ilbc_dec_class,
118 typedef struct ILBCEncContext {
119 const AVClass *class;
120 iLBC_Enc_Inst_t encoder;
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 },
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,
136 static av_cold int ilbc_encode_init(AVCodecContext *avctx)
138 ILBCEncContext *s = avctx->priv_data;
141 if (avctx->sample_rate != 8000) {
142 av_log(avctx, AV_LOG_ERROR, "Only 8000Hz sample rate supported\n");
143 return AVERROR(EINVAL);
146 if (avctx->channels != 1) {
147 av_log(avctx, AV_LOG_ERROR, "Only mono supported\n");
148 return AVERROR(EINVAL);
151 if ((mode = get_mode(avctx)) > 0)
154 s->mode = s->mode != 30 ? 20 : 30;
155 WebRtcIlbcfix_InitEncode(&s->encoder, s->mode);
157 avctx->block_align = s->encoder.no_of_bytes;
158 avctx->frame_size = s->encoder.blockl;
163 static int ilbc_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
164 const AVFrame *frame, int *got_packet_ptr)
166 ILBCEncContext *s = avctx->priv_data;
169 if ((ret = ff_alloc_packet2(avctx, avpkt, 50, 0)) < 0)
172 WebRtcIlbcfix_EncodeImpl((uint16_t *) avpkt->data, (const int16_t *) frame->data[0], &s->encoder);
174 avpkt->size = s->encoder.no_of_bytes;
179 static const AVCodecDefault ilbc_encode_defaults[] = {
184 AVCodec ff_libilbc_encoder = {
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 .wrapper_name = "libbilbc",