libavcodec/libilbc.c

   1 /*
   2  * iLBC decoder/encoder stub
   3  * Copyright (c) 2012 Martin Storsjo
   4  *
   5  * This file is part of Libav.
   6  *
   7  * Libav 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  * Libav 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 Libav; 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     AVFrame frame;
  45     iLBC_Dec_Inst_t decoder;
  46     int enhance;
  47 } ILBCDecContext;
  48
  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 },
  51     { NULL }
  52 };
  53
  54 static const AVClass ilbc_dec_class = {
  55     "libilbc", av_default_item_name, ilbc_dec_options, LIBAVUTIL_VERSION_INT
  56 };
  57
  58 static av_cold int ilbc_decode_init(AVCodecContext *avctx)
  59 {
  60     ILBCDecContext *s  = avctx->priv_data;
  61     int mode;
  62
  63     if ((mode = get_mode(avctx)) < 0) {
  64         av_log(avctx, AV_LOG_ERROR, "iLBC frame mode not indicated\n");
  65         return AVERROR(EINVAL);
  66     }
  67
  68     WebRtcIlbcfix_InitDecode(&s->decoder, mode, s->enhance);
  69     avcodec_get_frame_defaults(&s->frame);
  70     avctx->coded_frame = &s->frame;
  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     int ret;
  87
  88     if (s->decoder.no_of_bytes > buf_size) {
  89         av_log(avctx, AV_LOG_ERROR, "iLBC frame too short (%u, should be %u)\n",
  90                buf_size, s->decoder.no_of_bytes);
  91         return AVERROR_INVALIDDATA;
  92     }
  93
  94     s->frame.nb_samples = s->decoder.blockl;
  95     if ((ret = ff_get_buffer(avctx, &s->frame)) < 0) {
  96         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
  97         return ret;
  98     }
  99
 100     WebRtcIlbcfix_DecodeImpl((WebRtc_Word16*) s->frame.data[0],
 101                              (const WebRtc_UWord16*) buf, &s->decoder, 1);
 102
 103     *got_frame_ptr   = 1;
 104     *(AVFrame *)data = s->frame;
 105
 106     return s->decoder.no_of_bytes;
 107 }
 108
 109 AVCodec ff_libilbc_decoder = {
 110     .name           = "libilbc",
 111     .type           = AVMEDIA_TYPE_AUDIO,
 112     .id             = AV_CODEC_ID_ILBC,
 113     .priv_data_size = sizeof(ILBCDecContext),
 114     .init           = ilbc_decode_init,
 115     .decode         = ilbc_decode_frame,
 116     .capabilities   = CODEC_CAP_DR1,
 117     .long_name      = NULL_IF_CONFIG_SMALL("iLBC (Internet Low Bitrate Codec)"),
 118     .priv_class     = &ilbc_dec_class,
 119 };
 120
 121 typedef struct ILBCEncContext {
 122     const AVClass *class;
 123     iLBC_Enc_Inst_t encoder;
 124     int mode;
 125 } ILBCEncContext;
 126
 127 static const AVOption ilbc_enc_options[] = {
 128     { "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     { NULL }
 130 };
 131
 132 static const AVClass ilbc_enc_class = {
 133     "libilbc", av_default_item_name, ilbc_enc_options, 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 #if FF_API_OLD_ENCODE_AUDIO
 160     avctx->coded_frame = avcodec_alloc_frame();
 161     if (!avctx->coded_frame)
 162         return AVERROR(ENOMEM);
 163 #endif
 164
 165     return 0;
 166 }
 167
 168 static av_cold int ilbc_encode_close(AVCodecContext *avctx)
 169 {
 170 #if FF_API_OLD_ENCODE_AUDIO
 171     av_freep(&avctx->coded_frame);
 172 #endif
 173     return 0;
 174 }
 175
 176 static int ilbc_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
 177                              const AVFrame *frame, int *got_packet_ptr)
 178 {
 179     ILBCEncContext *s = avctx->priv_data;
 180     int ret;
 181
 182     if ((ret = ff_alloc_packet(avpkt, 50))) {
 183         av_log(avctx, AV_LOG_ERROR, "Error getting output packet\n");
 184         return ret;
 185     }
 186
 187     WebRtcIlbcfix_EncodeImpl((WebRtc_UWord16*) avpkt->data, (const WebRtc_Word16*) frame->data[0], &s->encoder);
 188
 189     avpkt->size     = s->encoder.no_of_bytes;
 190     *got_packet_ptr = 1;
 191     return 0;
 192 }
 193
 194 static const AVCodecDefault ilbc_encode_defaults[] = {
 195     { "b", "0" },
 196     { NULL }
 197 };
 198
 199 AVCodec ff_libilbc_encoder = {
 200     .name           = "libilbc",
 201     .type           = AVMEDIA_TYPE_AUDIO,
 202     .id             = AV_CODEC_ID_ILBC,
 203     .priv_data_size = sizeof(ILBCEncContext),
 204     .init           = ilbc_encode_init,
 205     .encode2        = ilbc_encode_frame,
 206     .close          = ilbc_encode_close,
 207     .sample_fmts    = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16,
 208                                                      AV_SAMPLE_FMT_NONE },
 209     .long_name      = NULL_IF_CONFIG_SMALL("iLBC (Internet Low Bitrate Codec)"),
 210     .defaults       = ilbc_encode_defaults,
 211     .priv_class     = &ilbc_enc_class,
 212 };