GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/cngenc.c Lines: 0 41 0.0 %
Date: 2020-09-25 23:16:12 Branches: 0 16 0.0 %

Line Branch Exec Source
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/*
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 * RFC 3389 comfort noise generator
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 * Copyright (c) 2012 Martin Storsjo
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg 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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 * FFmpeg 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 FFmpeg; 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 <math.h>
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#include "libavutil/common.h"
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#include "avcodec.h"
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#include "internal.h"
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#include "lpc.h"
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typedef struct CNGContext {
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    LPCContext lpc;
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    int order;
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    int32_t *samples32;
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    double *ref_coef;
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} CNGContext;
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static av_cold int cng_encode_close(AVCodecContext *avctx)
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{
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    CNGContext *p = avctx->priv_data;
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    ff_lpc_end(&p->lpc);
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    av_freep(&p->samples32);
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    av_freep(&p->ref_coef);
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    return 0;
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}
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static av_cold int cng_encode_init(AVCodecContext *avctx)
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{
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    CNGContext *p = avctx->priv_data;
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    int ret;
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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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    avctx->frame_size = 640;
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    p->order = 10;
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    if ((ret = ff_lpc_init(&p->lpc, avctx->frame_size, p->order, FF_LPC_TYPE_LEVINSON)) < 0)
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        return ret;
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    p->samples32 = av_malloc_array(avctx->frame_size, sizeof(*p->samples32));
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    p->ref_coef = av_malloc_array(p->order, sizeof(*p->ref_coef));
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    if (!p->samples32 || !p->ref_coef)
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        return AVERROR(ENOMEM);
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    return 0;
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}
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static int cng_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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    CNGContext *p = avctx->priv_data;
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    int ret, i;
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    double energy = 0;
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    int qdbov;
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    int16_t *samples = (int16_t*) frame->data[0];
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    if ((ret = ff_alloc_packet2(avctx, avpkt, 1 + p->order, 1 + p->order))) {
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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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    for (i = 0; i < frame->nb_samples; i++) {
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        p->samples32[i] = samples[i];
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        energy += samples[i] * samples[i];
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    }
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    energy /= frame->nb_samples;
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    if (energy > 0) {
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        double dbov = 10 * log10(energy / 1081109975);
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        qdbov = av_clip_uintp2(-floor(dbov), 7);
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    } else {
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        qdbov = 127;
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    }
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    ff_lpc_calc_ref_coefs(&p->lpc, p->samples32, p->order, p->ref_coef);
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    avpkt->data[0] = qdbov;
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    for (i = 0; i < p->order; i++)
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        avpkt->data[1 + i] = p->ref_coef[i] * 127 + 127;
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    *got_packet_ptr = 1;
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    av_assert1(avpkt->size == 1 + p->order);
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    return 0;
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}
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AVCodec ff_comfortnoise_encoder = {
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    .name           = "comfortnoise",
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    .long_name      = NULL_IF_CONFIG_SMALL("RFC 3389 comfort noise generator"),
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    .type           = AVMEDIA_TYPE_AUDIO,
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    .id             = AV_CODEC_ID_COMFORT_NOISE,
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    .priv_data_size = sizeof(CNGContext),
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    .init           = cng_encode_init,
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    .encode2        = cng_encode_frame,
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    .close          = cng_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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    .caps_internal  = FF_CODEC_CAP_INIT_CLEANUP,
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};