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 {
45 iLBC_Dec_Inst_t decoder;
49 static const AVOption ilbc_dec_options[] = {
50 { "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 },
54 static const AVClass ilbc_dec_class = {
55 .class_name = "libilbc",
56 .item_name = av_default_item_name,
57 .option = ilbc_dec_options,
58 .version = LIBAVUTIL_VERSION_INT,
61 static av_cold int ilbc_decode_init(AVCodecContext *avctx)
63 ILBCDecContext *s = avctx->priv_data;
66 if ((mode = get_mode(avctx)) < 0) {
67 av_log(avctx, AV_LOG_ERROR, "iLBC frame mode not indicated\n");
68 return AVERROR(EINVAL);
71 WebRtcIlbcfix_InitDecode(&s->decoder, mode, s->enhance);
72 avcodec_get_frame_defaults(&s->frame);
73 avctx->coded_frame = &s->frame;
76 avctx->channel_layout = AV_CH_LAYOUT_MONO;
77 avctx->sample_rate = 8000;
78 avctx->sample_fmt = AV_SAMPLE_FMT_S16;
83 static int ilbc_decode_frame(AVCodecContext *avctx, void *data,
84 int *got_frame_ptr, AVPacket *avpkt)
86 const uint8_t *buf = avpkt->data;
87 int buf_size = avpkt->size;
88 ILBCDecContext *s = avctx->priv_data;
91 if (s->decoder.no_of_bytes > buf_size) {
92 av_log(avctx, AV_LOG_ERROR, "iLBC frame too short (%u, should be %u)\n",
93 buf_size, s->decoder.no_of_bytes);
94 return AVERROR_INVALIDDATA;
97 s->frame.nb_samples = s->decoder.blockl;
98 if ((ret = ff_get_buffer(avctx, &s->frame)) < 0) {
99 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
103 WebRtcIlbcfix_DecodeImpl((WebRtc_Word16*) s->frame.data[0],
104 (const WebRtc_UWord16*) buf, &s->decoder, 1);
107 *(AVFrame *)data = s->frame;
109 return s->decoder.no_of_bytes;
112 AVCodec ff_libilbc_decoder = {
114 .type = AVMEDIA_TYPE_AUDIO,
115 .id = AV_CODEC_ID_ILBC,
116 .priv_data_size = sizeof(ILBCDecContext),
117 .init = ilbc_decode_init,
118 .decode = ilbc_decode_frame,
119 .capabilities = CODEC_CAP_DR1,
120 .long_name = NULL_IF_CONFIG_SMALL("iLBC (Internet Low Bitrate Codec)"),
121 .priv_class = &ilbc_dec_class,
124 typedef struct ILBCEncContext {
125 const AVClass *class;
126 iLBC_Enc_Inst_t encoder;
130 static const AVOption ilbc_enc_options[] = {
131 { "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 },
135 static const AVClass ilbc_enc_class = {
136 .class_name = "libilbc",
137 .item_name = av_default_item_name,
138 .option = ilbc_enc_options,
139 .version = LIBAVUTIL_VERSION_INT,
142 static av_cold int ilbc_encode_init(AVCodecContext *avctx)
144 ILBCEncContext *s = avctx->priv_data;
147 if (avctx->sample_rate != 8000) {
148 av_log(avctx, AV_LOG_ERROR, "Only 8000Hz sample rate supported\n");
149 return AVERROR(EINVAL);
152 if (avctx->channels != 1) {
153 av_log(avctx, AV_LOG_ERROR, "Only mono supported\n");
154 return AVERROR(EINVAL);
157 if ((mode = get_mode(avctx)) > 0)
160 s->mode = s->mode != 30 ? 20 : 30;
161 WebRtcIlbcfix_InitEncode(&s->encoder, s->mode);
163 avctx->block_align = s->encoder.no_of_bytes;
164 avctx->frame_size = s->encoder.blockl;
165 #if FF_API_OLD_ENCODE_AUDIO
166 avctx->coded_frame = avcodec_alloc_frame();
167 if (!avctx->coded_frame)
168 return AVERROR(ENOMEM);
174 static av_cold int ilbc_encode_close(AVCodecContext *avctx)
176 #if FF_API_OLD_ENCODE_AUDIO
177 av_freep(&avctx->coded_frame);
182 static int ilbc_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
183 const AVFrame *frame, int *got_packet_ptr)
185 ILBCEncContext *s = avctx->priv_data;
188 if ((ret = ff_alloc_packet(avpkt, 50))) {
189 av_log(avctx, AV_LOG_ERROR, "Error getting output packet\n");
193 WebRtcIlbcfix_EncodeImpl((WebRtc_UWord16*) avpkt->data, (const WebRtc_Word16*) frame->data[0], &s->encoder);
195 avpkt->size = s->encoder.no_of_bytes;
200 static const AVCodecDefault ilbc_encode_defaults[] = {
205 AVCodec ff_libilbc_encoder = {
207 .type = AVMEDIA_TYPE_AUDIO,
208 .id = AV_CODEC_ID_ILBC,
209 .priv_data_size = sizeof(ILBCEncContext),
210 .init = ilbc_encode_init,
211 .encode2 = ilbc_encode_frame,
212 .close = ilbc_encode_close,
213 .sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16,
214 AV_SAMPLE_FMT_NONE },
215 .long_name = NULL_IF_CONFIG_SMALL("iLBC (Internet Low Bitrate Codec)"),
216 .defaults = ilbc_encode_defaults,
217 .priv_class = &ilbc_enc_class,