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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((WebRtc_Word16*) frame->data[0],
  100.                              (const WebRtc_UWord16*) buf, &s->decoder, 1);
  101.  
  102.     *got_frame_ptr = 1;
  103.  
  104.     return s->decoder.no_of_bytes;
  105. }
  106.  
  107. AVCodec ff_libilbc_decoder = {
  108.     .name           = "libilbc",
  109.     .long_name      = NULL_IF_CONFIG_SMALL("iLBC (Internet Low Bitrate Codec)"),
  110.     .type           = AVMEDIA_TYPE_AUDIO,
  111.     .id             = AV_CODEC_ID_ILBC,
  112.     .priv_data_size = sizeof(ILBCDecContext),
  113.     .init           = ilbc_decode_init,
  114.     .decode         = ilbc_decode_frame,
  115.     .capabilities   = CODEC_CAP_DR1,
  116.     .priv_class     = &ilbc_dec_class,
  117. };
  118.  
  119. typedef struct ILBCEncContext {
  120.     const AVClass *class;
  121.     iLBC_Enc_Inst_t encoder;
  122.     int mode;
  123. } ILBCEncContext;
  124.  
  125. static const AVOption ilbc_enc_options[] = {
  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 },
  127.     { NULL }
  128. };
  129.  
  130. static const AVClass ilbc_enc_class = {
  131.     .class_name = "libilbc",
  132.     .item_name  = av_default_item_name,
  133.     .option     = ilbc_enc_options,
  134.     .version    = LIBAVUTIL_VERSION_INT,
  135. };
  136.  
  137. static av_cold int ilbc_encode_init(AVCodecContext *avctx)
  138. {
  139.     ILBCEncContext *s = avctx->priv_data;
  140.     int mode;
  141.  
  142.     if (avctx->sample_rate != 8000) {
  143.         av_log(avctx, AV_LOG_ERROR, "Only 8000Hz sample rate supported\n");
  144.         return AVERROR(EINVAL);
  145.     }
  146.  
  147.     if (avctx->channels != 1) {
  148.         av_log(avctx, AV_LOG_ERROR, "Only mono supported\n");
  149.         return AVERROR(EINVAL);
  150.     }
  151.  
  152.     if ((mode = get_mode(avctx)) > 0)
  153.         s->mode = mode;
  154.     else
  155.         s->mode = s->mode != 30 ? 20 : 30;
  156.     WebRtcIlbcfix_InitEncode(&s->encoder, s->mode);
  157.  
  158.     avctx->block_align = s->encoder.no_of_bytes;
  159.     avctx->frame_size  = s->encoder.blockl;
  160.  
  161.     return 0;
  162. }
  163.  
  164. static int ilbc_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
  165.                              const AVFrame *frame, int *got_packet_ptr)
  166. {
  167.     ILBCEncContext *s = avctx->priv_data;
  168.     int ret;
  169.  
  170.     if ((ret = ff_alloc_packet2(avctx, avpkt, 50)) < 0)
  171.         return ret;
  172.  
  173.     WebRtcIlbcfix_EncodeImpl((WebRtc_UWord16*) avpkt->data, (const WebRtc_Word16*) frame->data[0], &s->encoder);
  174.  
  175.     avpkt->size     = s->encoder.no_of_bytes;
  176.     *got_packet_ptr = 1;
  177.     return 0;
  178. }
  179.  
  180. static const AVCodecDefault ilbc_encode_defaults[] = {
  181.     { "b", "0" },
  182.     { NULL }
  183. };
  184.  
  185. AVCodec ff_libilbc_encoder = {
  186.     .name           = "libilbc",
  187.     .long_name      = NULL_IF_CONFIG_SMALL("iLBC (Internet Low Bitrate Codec)"),
  188.     .type           = AVMEDIA_TYPE_AUDIO,
  189.     .id             = AV_CODEC_ID_ILBC,
  190.     .priv_data_size = sizeof(ILBCEncContext),
  191.     .init           = ilbc_encode_init,
  192.     .encode2        = ilbc_encode_frame,
  193.     .sample_fmts    = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16,
  194.                                                      AV_SAMPLE_FMT_NONE },
  195.     .defaults       = ilbc_encode_defaults,
  196.     .priv_class     = &ilbc_enc_class,
  197. };
  198.