GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/ttaenc.c Lines: 87 105 82.9 %
Date: 2020-10-23 17:01:47 Branches: 39 53 73.6 %

Line Branch Exec Source
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/*
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 * TTA (The Lossless True Audio) encoder
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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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#define BITSTREAM_WRITER_LE
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#include "ttadata.h"
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#include "ttaencdsp.h"
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#include "avcodec.h"
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#include "put_bits.h"
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#include "internal.h"
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#include "libavutil/crc.h"
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typedef struct TTAEncContext {
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    const AVCRC *crc_table;
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    int bps;
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    TTAChannel *ch_ctx;
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    TTAEncDSPContext dsp;
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} TTAEncContext;
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3
static av_cold int tta_encode_init(AVCodecContext *avctx)
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{
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3
    TTAEncContext *s = avctx->priv_data;
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40
3
    s->crc_table = av_crc_get_table(AV_CRC_32_IEEE_LE);
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42

3
    switch (avctx->sample_fmt) {
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    case AV_SAMPLE_FMT_U8:
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        avctx->bits_per_raw_sample = 8;
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        break;
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3
    case AV_SAMPLE_FMT_S16:
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3
        avctx->bits_per_raw_sample = 16;
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3
        break;
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    case AV_SAMPLE_FMT_S32:
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        if (avctx->bits_per_raw_sample > 24)
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            av_log(avctx, AV_LOG_WARNING, "encoding as 24 bits-per-sample\n");
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        avctx->bits_per_raw_sample = 24;
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    }
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3
    s->bps = avctx->bits_per_raw_sample >> 3;
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3
    avctx->frame_size = 256 * avctx->sample_rate / 245;
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3
    s->ch_ctx = av_malloc_array(avctx->channels, sizeof(*s->ch_ctx));
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3
    if (!s->ch_ctx)
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        return AVERROR(ENOMEM);
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3
    ff_ttaencdsp_init(&s->dsp);
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3
    return 0;
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}
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882000
static int32_t get_sample(const AVFrame *frame, int sample,
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                          enum AVSampleFormat format)
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{
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    int32_t ret;
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882000
    if (format == AV_SAMPLE_FMT_U8) {
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        ret = frame->data[0][sample] - 0x80;
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882000
    } else if (format == AV_SAMPLE_FMT_S16) {
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882000
        const int16_t *ptr = (const int16_t *)frame->data[0];
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882000
        ret = ptr[sample];
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    } else {
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        const int32_t *ptr = (const int32_t *)frame->data[0];
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        ret = ptr[sample] >> 8;
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    }
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882000
    return ret;
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}
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static int tta_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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8
    TTAEncContext *s = avctx->priv_data;
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    PutBitContext pb;
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    int ret, i, out_bytes, cur_chan, res, samples;
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8
    int64_t pkt_size =  frame->nb_samples * 2LL * avctx->channels * s->bps;
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pkt_alloc:
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8
    cur_chan = 0, res = 0, samples = 0;
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8
    if ((ret = ff_alloc_packet2(avctx, avpkt, pkt_size, 0)) < 0)
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        return ret;
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8
    init_put_bits(&pb, avpkt->data, avpkt->size);
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    // init per channel states
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22
    for (i = 0; i < avctx->channels; i++) {
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14
        s->ch_ctx[i].predictor = 0;
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14
        ff_tta_filter_init(&s->ch_ctx[i].filter, ff_tta_filter_configs[s->bps - 1]);
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14
        ff_tta_rice_init(&s->ch_ctx[i].rice, 10, 10);
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    }
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617408
    for (i = 0; i < frame->nb_samples * avctx->channels; i++) {
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617400
        TTAChannel *c = &s->ch_ctx[cur_chan];
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617400
        TTAFilter *filter = &c->filter;
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617400
        TTARice *rice = &c->rice;
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        uint32_t k, unary, outval;
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        int32_t value, temp;
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617400
        value = get_sample(frame, samples++, avctx->sample_fmt);
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617400
        if (avctx->channels > 1) {
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529200
            if (cur_chan < avctx->channels - 1)
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264600
                value  = res = get_sample(frame, samples, avctx->sample_fmt) - value;
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            else
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264600
                value -= res / 2;
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        }
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617400
        temp = value;
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#define PRED(x, k) (int32_t)((((uint64_t)(x) << (k)) - (x)) >> (k))
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617400
        switch (s->bps) {
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        case 1: value -= PRED(c->predictor, 4); break;
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617400
        case 2:
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617400
        case 3: value -= PRED(c->predictor, 5); break;
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        }
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617400
        c->predictor = temp;
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131
617400
        s->dsp.filter_process(filter->qm, filter->dx, filter->dl, &filter->error, &value,
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                              filter->shift, filter->round);
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617400
        outval = (value > 0) ? (value << 1) - 1: -value << 1;
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135
617400
        k = rice->k0;
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137
617400
        rice->sum0 += outval - (rice->sum0 >> 4);
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617400
        if (rice->k0 > 0 && rice->sum0 < ff_tta_shift_16[rice->k0])
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17694
            rice->k0--;
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599706
        else if (rice->sum0 > ff_tta_shift_16[rice->k0 + 1])
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17600
            rice->k0++;
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143
617400
        if (outval >= ff_tta_shift_1[k]) {
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257183
            outval -= ff_tta_shift_1[k];
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257183
            k = rice->k1;
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147
257183
            rice->sum1 += outval - (rice->sum1 >> 4);
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257183
            if (rice->k1 > 0 && rice->sum1 < ff_tta_shift_16[rice->k1])
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7967
                rice->k1--;
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249216
            else if (rice->sum1 > ff_tta_shift_16[rice->k1 + 1])
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7889
                rice->k1++;
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153
257183
            unary = 1 + (outval >> k);
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257183
            if (unary + 100LL > put_bits_left(&pb)) {
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                if (pkt_size < INT_MAX/2) {
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                    pkt_size *= 2;
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                    av_packet_unref(avpkt);
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                    goto pkt_alloc;
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                } else
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                    return AVERROR(ENOMEM);
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            }
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            do {
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257763
                if (unary > 31) {
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580
                    put_bits(&pb, 31, 0x7FFFFFFF);
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580
                    unary -= 31;
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                } else {
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257183
                    put_bits(&pb, unary, (1U << unary) - 1);
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257183
                    unary = 0;
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                }
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257763
            } while (unary);
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        }
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617400
        put_bits(&pb, 1, 0);
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617400
        if (k)
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481630
            put_bits(&pb, k, outval & (ff_tta_shift_1[k] - 1));
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617400
        if (cur_chan < avctx->channels - 1)
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264600
            cur_chan++;
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        else
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352800
            cur_chan = 0;
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    }
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184
8
    flush_put_bits(&pb);
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8
    out_bytes = put_bits_count(&pb) >> 3;
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8
    put_bits32(&pb, av_crc(s->crc_table, UINT32_MAX, avpkt->data, out_bytes) ^ UINT32_MAX);
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8
    flush_put_bits(&pb);
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189
8
    avpkt->pts      = frame->pts;
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8
    avpkt->size     = out_bytes + 4;
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8
    avpkt->duration = ff_samples_to_time_base(avctx, frame->nb_samples);
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8
    *got_packet_ptr = 1;
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8
    return 0;
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}
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196
3
static av_cold int tta_encode_close(AVCodecContext *avctx)
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{
198
3
    TTAEncContext *s = avctx->priv_data;
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3
    av_freep(&s->ch_ctx);
200
3
    return 0;
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}
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AVCodec ff_tta_encoder = {
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    .name           = "tta",
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    .long_name      = NULL_IF_CONFIG_SMALL("TTA (True Audio)"),
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    .type           = AVMEDIA_TYPE_AUDIO,
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    .id             = AV_CODEC_ID_TTA,
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    .priv_data_size = sizeof(TTAEncContext),
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    .init           = tta_encode_init,
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    .close          = tta_encode_close,
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    .encode2        = tta_encode_frame,
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    .capabilities   = AV_CODEC_CAP_SMALL_LAST_FRAME,
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    .sample_fmts    = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_U8,
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                                                     AV_SAMPLE_FMT_S16,
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                                                     AV_SAMPLE_FMT_S32,
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                                                     AV_SAMPLE_FMT_NONE },
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};