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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 | }; |