GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/nellymoserdec.c Lines: 67 72 93.1 %
Date: 2021-04-18 10:33:33 Branches: 20 24 83.3 %

Line Branch Exec Source
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/*
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 * NellyMoser audio decoder
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 * Copyright (c) 2007 a840bda5870ba11f19698ff6eb9581dfb0f95fa5,
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 *                    539459aeb7d425140b62a3ec7dbf6dc8e408a306, and
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 *                    520e17cd55896441042b14df2566a6eb610ed444
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 * Copyright (c) 2007 Loic Minier <lool at dooz.org>
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 *                    Benjamin Larsson
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 *
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 * Permission is hereby granted, free of charge, to any person obtaining a
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 * copy of this software and associated documentation files (the "Software"),
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 * to deal in the Software without restriction, including without limitation
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 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
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 * and/or sell copies of the Software, and to permit persons to whom the
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 * Software is furnished to do so, subject to the following conditions:
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 *
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 * The above copyright notice and this permission notice shall be included in
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 * all copies or substantial portions of the Software.
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 *
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 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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 * DEALINGS IN THE SOFTWARE.
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 */
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/**
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 * @file
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 * The 3 alphanumeric copyright notices are md5summed they are from the original
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 * implementors. The original code is available from http://code.google.com/p/nelly2pcm/
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 */
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#include "libavutil/channel_layout.h"
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#include "libavutil/float_dsp.h"
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#include "libavutil/lfg.h"
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#include "libavutil/mem_internal.h"
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#include "libavutil/random_seed.h"
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#define BITSTREAM_READER_LE
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#include "avcodec.h"
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#include "fft.h"
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#include "get_bits.h"
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#include "internal.h"
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#include "nellymoser.h"
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#include "sinewin.h"
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typedef struct NellyMoserDecodeContext {
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    AVCodecContext* avctx;
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    AVLFG           random_state;
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    GetBitContext   gb;
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    float           scale_bias;
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    AVFloatDSPContext *fdsp;
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    FFTContext      imdct_ctx;
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    DECLARE_ALIGNED(32, float, imdct_buf)[2][NELLY_BUF_LEN];
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    float          *imdct_out;
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    float          *imdct_prev;
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} NellyMoserDecodeContext;
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static void nelly_decode_block(NellyMoserDecodeContext *s,
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                               const unsigned char block[NELLY_BLOCK_LEN],
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                               float audio[NELLY_SAMPLES])
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{
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    int i,j;
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    float buf[NELLY_FILL_LEN], pows[NELLY_FILL_LEN];
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    float *aptr, *bptr, *pptr, val, pval;
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    int bits[NELLY_BUF_LEN];
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    unsigned char v;
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    init_get_bits(&s->gb, block, NELLY_BLOCK_LEN * 8);
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    bptr = buf;
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2805
    pptr = pows;
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2805
    val = ff_nelly_init_table[get_bits(&s->gb, 6)];
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67320
    for (i=0 ; i<NELLY_BANDS ; i++) {
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64515
        if (i > 0)
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61710
            val += ff_nelly_delta_table[get_bits(&s->gb, 5)];
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64515
        pval = -exp2(val/2048) * s->scale_bias;
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412335
        for (j = 0; j < ff_nelly_band_sizes_table[i]; j++) {
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347820
            *bptr++ = val;
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            *pptr++ = pval;
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        }
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    }
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    ff_nelly_get_sample_bits(buf, bits);
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    for (i = 0; i < 2; i++) {
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        aptr = audio + i * NELLY_BUF_LEN;
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        init_get_bits(&s->gb, block, NELLY_BLOCK_LEN * 8);
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        skip_bits_long(&s->gb, NELLY_HEADER_BITS + i*NELLY_DETAIL_BITS);
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        for (j = 0; j < NELLY_FILL_LEN; j++) {
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            if (bits[j] <= 0) {
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                aptr[j] = M_SQRT1_2*pows[j];
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                if (av_lfg_get(&s->random_state) & 1)
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                    aptr[j] *= -1.0;
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            } else {
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502014
                v = get_bits(&s->gb, bits[j]);
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502014
                aptr[j] = ff_nelly_dequantization_table[(1<<bits[j])-1+v]*pows[j];
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            }
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        }
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        memset(&aptr[NELLY_FILL_LEN], 0,
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               (NELLY_BUF_LEN - NELLY_FILL_LEN) * sizeof(float));
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        s->imdct_ctx.imdct_half(&s->imdct_ctx, s->imdct_out, aptr);
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        s->fdsp->vector_fmul_window(aptr, s->imdct_prev + NELLY_BUF_LEN / 2,
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                                   s->imdct_out, ff_sine_128,
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                                   NELLY_BUF_LEN / 2);
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        FFSWAP(float *, s->imdct_out, s->imdct_prev);
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    }
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2805
}
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static av_cold int decode_init(AVCodecContext * avctx) {
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    NellyMoserDecodeContext *s = avctx->priv_data;
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    s->avctx = avctx;
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    s->imdct_out = s->imdct_buf[0];
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    s->imdct_prev = s->imdct_buf[1];
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    av_lfg_init(&s->random_state, 0);
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    ff_mdct_init(&s->imdct_ctx, 8, 1, 1.0);
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    s->fdsp = avpriv_float_dsp_alloc(avctx->flags & AV_CODEC_FLAG_BITEXACT);
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    if (!s->fdsp)
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        return AVERROR(ENOMEM);
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    s->scale_bias = 1.0/(32768*8);
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    avctx->sample_fmt = AV_SAMPLE_FMT_FLT;
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    avctx->channels       = 1;
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    avctx->channel_layout = AV_CH_LAYOUT_MONO;
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    /* Generate overlap window */
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    ff_init_ff_sine_windows(7);
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    return 0;
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}
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static int decode_tag(AVCodecContext *avctx, void *data,
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                      int *got_frame_ptr, AVPacket *avpkt)
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{
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    AVFrame *frame     = data;
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    const uint8_t *buf = avpkt->data;
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    int buf_size = avpkt->size;
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    NellyMoserDecodeContext *s = avctx->priv_data;
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    int blocks, i, ret;
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    float   *samples_flt;
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    blocks     = buf_size / NELLY_BLOCK_LEN;
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    if (blocks <= 0) {
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        av_log(avctx, AV_LOG_ERROR, "Packet is too small\n");
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        return AVERROR_INVALIDDATA;
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    }
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    if (buf_size % NELLY_BLOCK_LEN) {
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        av_log(avctx, AV_LOG_WARNING, "Leftover bytes: %d.\n",
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               buf_size % NELLY_BLOCK_LEN);
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    }
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    /* get output buffer */
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    frame->nb_samples = NELLY_SAMPLES * blocks;
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    if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
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        return ret;
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    samples_flt = (float *)frame->data[0];
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    for (i=0 ; i<blocks ; i++) {
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2805
        nelly_decode_block(s, buf, samples_flt);
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        samples_flt += NELLY_SAMPLES;
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        buf += NELLY_BLOCK_LEN;
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    }
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    *got_frame_ptr = 1;
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    return buf_size;
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}
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static av_cold int decode_end(AVCodecContext * avctx) {
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    NellyMoserDecodeContext *s = avctx->priv_data;
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    ff_mdct_end(&s->imdct_ctx);
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    av_freep(&s->fdsp);
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    return 0;
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}
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AVCodec ff_nellymoser_decoder = {
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    .name           = "nellymoser",
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    .long_name      = NULL_IF_CONFIG_SMALL("Nellymoser Asao"),
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    .type           = AVMEDIA_TYPE_AUDIO,
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    .id             = AV_CODEC_ID_NELLYMOSER,
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    .priv_data_size = sizeof(NellyMoserDecodeContext),
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    .init           = decode_init,
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    .close          = decode_end,
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    .decode         = decode_tag,
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    .capabilities   = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_PARAM_CHANGE | AV_CODEC_CAP_CHANNEL_CONF,
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    .sample_fmts    = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLT,
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                                                      AV_SAMPLE_FMT_NONE },
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    .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE,
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};