The wrapper code is based on the libamr wrapper removed in SVN rev 19365. Signed-off-by: Martin Storsjö <martin@martin.st>oldabi
Martin Storsjö
16 years ago
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7 changed files with 139 additions and 2 deletions
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/*
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* AMR Audio encoder stub |
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* Copyright (c) 2003 the ffmpeg project |
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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 <vo-amrwbenc/enc_if.h> |
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#include "avcodec.h" |
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static const char wb_bitrate_unsupported[] = |
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"bitrate not supported: use one of 6.6k, 8.85k, 12.65k, 14.25k, 15.85k, " |
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"18.25k, 19.85k, 23.05k, or 23.85k\n"; |
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typedef struct AMRWB_bitrates { |
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int rate; |
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int mode; |
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} AMRWB_bitrates; |
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typedef struct AMRWBContext { |
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void *state; |
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int mode; |
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int allow_dtx; |
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} AMRWBContext; |
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static int getWBBitrateMode(int bitrate) |
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{ |
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/* make the correspondance between bitrate and mode */ |
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AMRWB_bitrates rates[] = { { 6600, 0}, |
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{ 8850, 1}, |
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{12650, 2}, |
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{14250, 3}, |
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{15850, 4}, |
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{18250, 5}, |
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{19850, 6}, |
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{23050, 7}, |
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{23850, 8}, }; |
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int i; |
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for (i = 0; i < 9; i++) |
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if (rates[i].rate == bitrate) |
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return rates[i].mode; |
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/* no bitrate matching, return an error */ |
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return -1; |
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} |
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static av_cold int amr_wb_encode_init(AVCodecContext *avctx) |
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{ |
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AMRWBContext *s = avctx->priv_data; |
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if (avctx->sample_rate != 16000) { |
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av_log(avctx, AV_LOG_ERROR, "Only 16000Hz sample rate supported\n"); |
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return -1; |
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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 -1; |
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} |
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if ((s->mode = getWBBitrateMode(avctx->bit_rate)) < 0) { |
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av_log(avctx, AV_LOG_ERROR, wb_bitrate_unsupported); |
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return -1; |
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} |
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avctx->frame_size = 320; |
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avctx->coded_frame = avcodec_alloc_frame(); |
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s->state = E_IF_init(); |
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s->allow_dtx = 0; |
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return 0; |
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} |
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static int amr_wb_encode_close(AVCodecContext *avctx) |
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{ |
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AMRWBContext *s = avctx->priv_data; |
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E_IF_exit(s->state); |
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av_freep(&avctx->coded_frame); |
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return 0; |
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} |
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static int amr_wb_encode_frame(AVCodecContext *avctx, |
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unsigned char *frame/*out*/, |
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int buf_size, void *data/*in*/) |
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{ |
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AMRWBContext *s = avctx->priv_data; |
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int size; |
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if ((s->mode = getWBBitrateMode(avctx->bit_rate)) < 0) { |
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av_log(avctx, AV_LOG_ERROR, wb_bitrate_unsupported); |
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return -1; |
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} |
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size = E_IF_encode(s->state, s->mode, data, frame, s->allow_dtx); |
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return size; |
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} |
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AVCodec ff_libvo_amrwbenc_encoder = { |
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"libvo_amrwbenc", |
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CODEC_TYPE_AUDIO, |
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CODEC_ID_AMR_WB, |
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sizeof(AMRWBContext), |
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amr_wb_encode_init, |
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amr_wb_encode_frame, |
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amr_wb_encode_close, |
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NULL, |
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.sample_fmts = (enum SampleFormat[]){SAMPLE_FMT_S16,SAMPLE_FMT_NONE}, |
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.long_name = NULL_IF_CONFIG_SMALL("libvo-amrwbenc Adaptive Multi-Rate " |
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"(AMR) Wide-Band"), |
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}; |
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