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4349 | Serge | 1 | /* |
2 | * iLBC decoder/encoder stub |
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3 | * Copyright (c) 2012 Martin Storsjo |
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4 | * |
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5 | * This file is part of FFmpeg. |
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6 | * |
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7 | * FFmpeg is free software; you can redistribute it and/or |
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8 | * modify it under the terms of the GNU Lesser General Public |
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9 | * License as published by the Free Software Foundation; either |
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10 | * version 2.1 of the License, or (at your option) any later version. |
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11 | * |
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12 | * FFmpeg is distributed in the hope that it will be useful, |
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13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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15 | * Lesser General Public License for more details. |
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16 | * |
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17 | * You should have received a copy of the GNU Lesser General Public |
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18 | * License along with FFmpeg; if not, write to the Free Software |
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19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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20 | */ |
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21 | |||
22 | #include |
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23 | |||
24 | #include "libavutil/channel_layout.h" |
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25 | #include "libavutil/common.h" |
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26 | #include "libavutil/opt.h" |
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27 | #include "avcodec.h" |
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28 | #include "internal.h" |
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29 | |||
30 | static int get_mode(AVCodecContext *avctx) |
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31 | { |
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32 | if (avctx->block_align == 38) |
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33 | return 20; |
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34 | else if (avctx->block_align == 50) |
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35 | return 30; |
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36 | else if (avctx->bit_rate > 0) |
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37 | return avctx->bit_rate <= 14000 ? 30 : 20; |
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38 | else |
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39 | return -1; |
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40 | } |
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41 | |||
42 | typedef struct ILBCDecContext { |
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43 | const AVClass *class; |
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44 | iLBC_Dec_Inst_t decoder; |
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45 | int enhance; |
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46 | } ILBCDecContext; |
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47 | |||
48 | static const AVOption ilbc_dec_options[] = { |
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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 }, |
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50 | { NULL } |
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51 | }; |
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52 | |||
53 | static const AVClass ilbc_dec_class = { |
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54 | .class_name = "libilbc", |
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55 | .item_name = av_default_item_name, |
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56 | .option = ilbc_dec_options, |
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57 | .version = LIBAVUTIL_VERSION_INT, |
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58 | }; |
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59 | |||
60 | static av_cold int ilbc_decode_init(AVCodecContext *avctx) |
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61 | { |
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62 | ILBCDecContext *s = avctx->priv_data; |
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63 | int mode; |
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64 | |||
65 | if ((mode = get_mode(avctx)) < 0) { |
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66 | av_log(avctx, AV_LOG_ERROR, "iLBC frame mode not indicated\n"); |
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67 | return AVERROR(EINVAL); |
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68 | } |
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69 | |||
70 | WebRtcIlbcfix_InitDecode(&s->decoder, mode, s->enhance); |
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71 | |||
72 | avctx->channels = 1; |
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73 | avctx->channel_layout = AV_CH_LAYOUT_MONO; |
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74 | avctx->sample_rate = 8000; |
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75 | avctx->sample_fmt = AV_SAMPLE_FMT_S16; |
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76 | |||
77 | return 0; |
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78 | } |
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79 | |||
80 | static int ilbc_decode_frame(AVCodecContext *avctx, void *data, |
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81 | int *got_frame_ptr, AVPacket *avpkt) |
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82 | { |
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83 | const uint8_t *buf = avpkt->data; |
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84 | int buf_size = avpkt->size; |
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85 | ILBCDecContext *s = avctx->priv_data; |
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86 | AVFrame *frame = data; |
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87 | int ret; |
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88 | |||
89 | if (s->decoder.no_of_bytes > buf_size) { |
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90 | av_log(avctx, AV_LOG_ERROR, "iLBC frame too short (%u, should be %u)\n", |
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91 | buf_size, s->decoder.no_of_bytes); |
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92 | return AVERROR_INVALIDDATA; |
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93 | } |
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94 | |||
95 | frame->nb_samples = s->decoder.blockl; |
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96 | if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) |
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97 | return ret; |
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98 | |||
99 | WebRtcIlbcfix_DecodeImpl((WebRtc_Word16*) frame->data[0], |
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100 | (const WebRtc_UWord16*) buf, &s->decoder, 1); |
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101 | |||
102 | *got_frame_ptr = 1; |
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103 | |||
104 | return s->decoder.no_of_bytes; |
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105 | } |
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106 | |||
107 | AVCodec ff_libilbc_decoder = { |
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108 | .name = "libilbc", |
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109 | .long_name = NULL_IF_CONFIG_SMALL("iLBC (Internet Low Bitrate Codec)"), |
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110 | .type = AVMEDIA_TYPE_AUDIO, |
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111 | .id = AV_CODEC_ID_ILBC, |
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112 | .priv_data_size = sizeof(ILBCDecContext), |
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113 | .init = ilbc_decode_init, |
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114 | .decode = ilbc_decode_frame, |
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115 | .capabilities = CODEC_CAP_DR1, |
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116 | .priv_class = &ilbc_dec_class, |
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117 | }; |
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118 | |||
119 | typedef struct ILBCEncContext { |
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120 | const AVClass *class; |
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121 | iLBC_Enc_Inst_t encoder; |
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122 | int mode; |
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123 | } ILBCEncContext; |
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124 | |||
125 | static const AVOption ilbc_enc_options[] = { |
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126 | { "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 }, |
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127 | { NULL } |
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128 | }; |
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129 | |||
130 | static const AVClass ilbc_enc_class = { |
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131 | .class_name = "libilbc", |
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132 | .item_name = av_default_item_name, |
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133 | .option = ilbc_enc_options, |
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134 | .version = LIBAVUTIL_VERSION_INT, |
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135 | }; |
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136 | |||
137 | static av_cold int ilbc_encode_init(AVCodecContext *avctx) |
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138 | { |
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139 | ILBCEncContext *s = avctx->priv_data; |
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140 | int mode; |
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141 | |||
142 | if (avctx->sample_rate != 8000) { |
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143 | av_log(avctx, AV_LOG_ERROR, "Only 8000Hz sample rate supported\n"); |
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144 | return AVERROR(EINVAL); |
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145 | } |
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146 | |||
147 | if (avctx->channels != 1) { |
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148 | av_log(avctx, AV_LOG_ERROR, "Only mono supported\n"); |
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149 | return AVERROR(EINVAL); |
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150 | } |
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151 | |||
152 | if ((mode = get_mode(avctx)) > 0) |
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153 | s->mode = mode; |
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154 | else |
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155 | s->mode = s->mode != 30 ? 20 : 30; |
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156 | WebRtcIlbcfix_InitEncode(&s->encoder, s->mode); |
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157 | |||
158 | avctx->block_align = s->encoder.no_of_bytes; |
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159 | avctx->frame_size = s->encoder.blockl; |
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160 | |||
161 | return 0; |
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162 | } |
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163 | |||
164 | static int ilbc_encode_frame(AVCodecContext *avctx, AVPacket *avpkt, |
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165 | const AVFrame *frame, int *got_packet_ptr) |
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166 | { |
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167 | ILBCEncContext *s = avctx->priv_data; |
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168 | int ret; |
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169 | |||
170 | if ((ret = ff_alloc_packet2(avctx, avpkt, 50)) < 0) |
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171 | return ret; |
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172 | |||
173 | WebRtcIlbcfix_EncodeImpl((WebRtc_UWord16*) avpkt->data, (const WebRtc_Word16*) frame->data[0], &s->encoder); |
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174 | |||
175 | avpkt->size = s->encoder.no_of_bytes; |
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176 | *got_packet_ptr = 1; |
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177 | return 0; |
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178 | } |
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179 | |||
180 | static const AVCodecDefault ilbc_encode_defaults[] = { |
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181 | { "b", "0" }, |
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182 | { NULL } |
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183 | }; |
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184 | |||
185 | AVCodec ff_libilbc_encoder = { |
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186 | .name = "libilbc", |
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187 | .long_name = NULL_IF_CONFIG_SMALL("iLBC (Internet Low Bitrate Codec)"), |
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188 | .type = AVMEDIA_TYPE_AUDIO, |
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189 | .id = AV_CODEC_ID_ILBC, |
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190 | .priv_data_size = sizeof(ILBCEncContext), |
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191 | .init = ilbc_encode_init, |
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192 | .encode2 = ilbc_encode_frame, |
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193 | .sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16, |
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194 | AV_SAMPLE_FMT_NONE }, |
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195 | .defaults = ilbc_encode_defaults, |
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196 | .priv_class = &ilbc_enc_class, |
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197 | };>>>=> |