mirror of https://github.com/FFmpeg/FFmpeg.git
The library is 3-clause BSD licensed. Signed-off-by: Martin Storsjö <martin@martin.st>pull/59/head
Martin Storsjö
13 years ago
parent
46743a859c
commit
3641b0489c
9 changed files with 239 additions and 1 deletions
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/*
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* iLBC decoder/encoder stub |
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* Copyright (c) 2012 Martin Storsjo |
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* |
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* This file is part of Libav. |
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* |
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* Libav is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* Libav is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with Libav; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#include <ilbc.h> |
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#include "avcodec.h" |
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#include "libavutil/opt.h" |
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#include "internal.h" |
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static int get_mode(AVCodecContext *avctx) |
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{ |
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if (avctx->block_align == 38) |
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return 20; |
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else if (avctx->block_align == 50) |
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return 30; |
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else if (avctx->bit_rate > 0) |
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return avctx->bit_rate <= 14000 ? 30 : 20; |
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else |
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return -1; |
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} |
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typedef struct ILBCDecContext { |
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const AVClass *class; |
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AVFrame frame; |
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iLBC_Dec_Inst_t decoder; |
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int enhance; |
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} ILBCDecContext; |
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static const AVOption ilbc_dec_options[] = { |
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{ "enhance", "Enhance the decoded audio (adds delay)", offsetof(ILBCDecContext, enhance), AV_OPT_TYPE_INT, { 0 }, 0, 1, AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_DECODING_PARAM }, |
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{ NULL } |
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}; |
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static const AVClass ilbc_dec_class = { |
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"libilbc", av_default_item_name, ilbc_dec_options, LIBAVUTIL_VERSION_INT |
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}; |
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static av_cold int ilbc_decode_init(AVCodecContext *avctx) |
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{ |
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ILBCDecContext *s = avctx->priv_data; |
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int mode; |
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if ((mode = get_mode(avctx)) < 0) { |
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av_log(avctx, AV_LOG_ERROR, "iLBC frame mode not indicated\n"); |
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return AVERROR(EINVAL); |
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} |
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WebRtcIlbcfix_InitDecode(&s->decoder, mode, s->enhance); |
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avcodec_get_frame_defaults(&s->frame); |
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avctx->coded_frame = &s->frame; |
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avctx->channels = 1; |
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avctx->sample_rate = 8000; |
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avctx->sample_fmt = AV_SAMPLE_FMT_S16; |
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return 0; |
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} |
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static int ilbc_decode_frame(AVCodecContext *avctx, void *data, |
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int *got_frame_ptr, AVPacket *avpkt) |
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{ |
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const uint8_t *buf = avpkt->data; |
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int buf_size = avpkt->size; |
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ILBCDecContext *s = avctx->priv_data; |
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int ret; |
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if (s->decoder.no_of_bytes > buf_size) { |
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av_log(avctx, AV_LOG_ERROR, "iLBC frame too short (%u, should be %u)\n", |
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buf_size, s->decoder.no_of_bytes); |
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return AVERROR_INVALIDDATA; |
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} |
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s->frame.nb_samples = s->decoder.blockl; |
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if ((ret = avctx->get_buffer(avctx, &s->frame)) < 0) { |
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av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); |
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return ret; |
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} |
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WebRtcIlbcfix_DecodeImpl((WebRtc_Word16*) s->frame.data[0], |
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(const WebRtc_UWord16*) buf, &s->decoder, 1); |
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*got_frame_ptr = 1; |
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*(AVFrame *)data = s->frame; |
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return s->decoder.no_of_bytes; |
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} |
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AVCodec ff_libilbc_decoder = { |
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.name = "libilbc", |
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.type = AVMEDIA_TYPE_AUDIO, |
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.id = CODEC_ID_ILBC, |
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.priv_data_size = sizeof(ILBCDecContext), |
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.init = ilbc_decode_init, |
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.decode = ilbc_decode_frame, |
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.capabilities = CODEC_CAP_DR1, |
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.long_name = NULL_IF_CONFIG_SMALL("Internet Low Bitrate Codec (iLBC)"), |
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.priv_class = &ilbc_dec_class, |
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}; |
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typedef struct ILBCEncContext { |
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const AVClass *class; |
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iLBC_Enc_Inst_t encoder; |
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int mode; |
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} ILBCEncContext; |
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static const AVOption ilbc_enc_options[] = { |
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{ "mode", "iLBC mode (20 or 30 ms frames)", offsetof(ILBCEncContext, mode), AV_OPT_TYPE_INT, { 20 }, 20, 30, AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM }, |
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{ NULL } |
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}; |
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static const AVClass ilbc_enc_class = { |
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"libilbc", av_default_item_name, ilbc_enc_options, LIBAVUTIL_VERSION_INT |
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}; |
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static av_cold int ilbc_encode_init(AVCodecContext *avctx) |
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{ |
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ILBCEncContext *s = avctx->priv_data; |
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int mode; |
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if (avctx->sample_rate != 8000) { |
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av_log(avctx, AV_LOG_ERROR, "Only 8000Hz sample rate supported\n"); |
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return AVERROR(EINVAL); |
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} |
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if (avctx->channels != 1) { |
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av_log(avctx, AV_LOG_ERROR, "Only mono supported\n"); |
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return AVERROR(EINVAL); |
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} |
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if ((mode = get_mode(avctx)) > 0) |
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s->mode = mode; |
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else |
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s->mode = s->mode != 30 ? 20 : 30; |
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WebRtcIlbcfix_InitEncode(&s->encoder, s->mode); |
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avctx->block_align = s->encoder.no_of_bytes; |
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avctx->frame_size = s->encoder.blockl; |
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#if FF_API_OLD_ENCODE_AUDIO |
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avctx->coded_frame = avcodec_alloc_frame(); |
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if (!avctx->coded_frame) |
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return AVERROR(ENOMEM); |
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#endif |
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return 0; |
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} |
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static av_cold int ilbc_encode_close(AVCodecContext *avctx) |
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{ |
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#if FF_API_OLD_ENCODE_AUDIO |
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av_freep(&avctx->coded_frame); |
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#endif |
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return 0; |
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} |
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static int ilbc_encode_frame(AVCodecContext *avctx, AVPacket *avpkt, |
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const AVFrame *frame, int *got_packet_ptr) |
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{ |
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ILBCEncContext *s = avctx->priv_data; |
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int ret; |
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if ((ret = ff_alloc_packet(avpkt, 50))) { |
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av_log(avctx, AV_LOG_ERROR, "Error getting output packet\n"); |
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return ret; |
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} |
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WebRtcIlbcfix_EncodeImpl((WebRtc_UWord16*) avpkt->data, (const WebRtc_Word16*) frame->data[0], &s->encoder); |
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avpkt->size = s->encoder.no_of_bytes; |
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*got_packet_ptr = 1; |
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return 0; |
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} |
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static const AVCodecDefault ilbc_encode_defaults[] = { |
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{ "b", "0" }, |
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{ NULL } |
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}; |
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AVCodec ff_libilbc_encoder = { |
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.name = "libilbc", |
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.type = AVMEDIA_TYPE_AUDIO, |
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.id = CODEC_ID_ILBC, |
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.priv_data_size = sizeof(ILBCEncContext), |
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.init = ilbc_encode_init, |
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.encode2 = ilbc_encode_frame, |
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.close = ilbc_encode_close, |
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.sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16, |
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AV_SAMPLE_FMT_NONE }, |
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.long_name = NULL_IF_CONFIG_SMALL("Internet Low Bitrate Codec (iLBC)"), |
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.defaults = ilbc_encode_defaults, |
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.priv_class = &ilbc_enc_class, |
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}; |
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