indeo2.c 8.39 KB
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/*
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 * Intel Indeo 2 codec
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 * Copyright (c) 2005 Konstantin Shishkov
 *
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 * This file is part of FFmpeg.
 *
 * 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
 * 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
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * 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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/**
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 * @file
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 * Intel Indeo 2 decoder.
 */
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#include "libavutil/attributes.h"
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#define BITSTREAM_READER_LE
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#include "avcodec.h"
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#include "get_bits.h"
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#include "indeo2data.h"
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#include "internal.h"
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#include "mathops.h"
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typedef struct Ir2Context{
    AVCodecContext *avctx;
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    AVFrame *picture;
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    GetBitContext gb;
    int decode_delta;
} Ir2Context;

#define CODE_VLC_BITS 14
static VLC ir2_vlc;

/* Indeo 2 codes are in range 0x01..0x7F and 0x81..0x90 */
static inline int ir2_get_code(GetBitContext *gb)
{
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    return get_vlc2(gb, ir2_vlc.table, CODE_VLC_BITS, 1) + 1;
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}

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static int ir2_decode_plane(Ir2Context *ctx, int width, int height, uint8_t *dst,
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                            int pitch, const uint8_t *table)
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{
    int i;
    int j;
    int out = 0;
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    if (width & 1)
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        return AVERROR_INVALIDDATA;
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    /* first line contain absolute values, other lines contain deltas */
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    while (out < width) {
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        int c = ir2_get_code(&ctx->gb);
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        if (c >= 0x80) { /* we have a run */
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            c -= 0x7F;
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            if (out + c*2 > width)
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                return AVERROR_INVALIDDATA;
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            for (i = 0; i < c * 2; i++)
                dst[out++] = 0x80;
        } else { /* copy two values from table */
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            if (c <= 0)
                return AVERROR_INVALIDDATA;
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            dst[out++] = table[c * 2];
            dst[out++] = table[(c * 2) + 1];
        }
    }
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    dst += pitch;
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    for (j = 1; j < height; j++) {
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        out = 0;
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        if (get_bits_left(&ctx->gb) <= 0)
            return AVERROR_INVALIDDATA;
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        while (out < width) {
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            int c = ir2_get_code(&ctx->gb);
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            if (c >= 0x80) { /* we have a skip */
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                c -= 0x7F;
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                if (out + c*2 > width)
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                    return AVERROR_INVALIDDATA;
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                for (i = 0; i < c * 2; i++) {
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                    dst[out] = dst[out - pitch];
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                    out++;
                }
            } else { /* add two deltas from table */
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                int t;
                if (c <= 0)
                    return AVERROR_INVALIDDATA;
                t        = dst[out - pitch] + (table[c * 2] - 128);
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                t        = av_clip_uint8(t);
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                dst[out] = t;
                out++;
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                t        = dst[out - pitch] + (table[(c * 2) + 1] - 128);
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                t        = av_clip_uint8(t);
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                dst[out] = t;
                out++;
            }
        }
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        dst += pitch;
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    }
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    return 0;
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}

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static int ir2_decode_plane_inter(Ir2Context *ctx, int width, int height, uint8_t *dst,
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                                  int pitch, const uint8_t *table)
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{
    int j;
    int out = 0;
    int c;
    int t;
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    if (width & 1)
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        return AVERROR_INVALIDDATA;
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    for (j = 0; j < height; j++) {
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        out = 0;
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        if (get_bits_left(&ctx->gb) <= 0)
            return AVERROR_INVALIDDATA;
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        while (out < width) {
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            c = ir2_get_code(&ctx->gb);
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            if (c >= 0x80) { /* we have a skip */
                c   -= 0x7F;
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                out += c * 2;
            } else { /* add two deltas from table */
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                if (c <= 0)
                    return AVERROR_INVALIDDATA;
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                t        = dst[out] + (((table[c * 2] - 128)*3) >> 2);
                t        = av_clip_uint8(t);
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                dst[out] = t;
                out++;
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                t        = dst[out] + (((table[(c * 2) + 1] - 128)*3) >> 2);
                t        = av_clip_uint8(t);
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                dst[out] = t;
                out++;
            }
        }
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        dst += pitch;
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    }
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    return 0;
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}

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static int ir2_decode_frame(AVCodecContext *avctx,
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                        void *data, int *got_frame,
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                        AVPacket *avpkt)
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{
    Ir2Context * const s = avctx->priv_data;
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    const uint8_t *buf   = avpkt->data;
    int buf_size         = avpkt->size;
    AVFrame *picture     = data;
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    AVFrame * const p    = s->picture;
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    int start, ret;
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    int ltab, ctab;
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    if ((ret = ff_reget_buffer(avctx, p)) < 0)
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        return ret;
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    start = 48; /* hardcoded for now */

    if (start >= buf_size) {
        av_log(s->avctx, AV_LOG_ERROR, "input buffer size too small (%d)\n", buf_size);
        return AVERROR_INVALIDDATA;
    }

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    s->decode_delta = buf[18];
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    /* decide whether frame uses deltas or not */
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#ifndef BITSTREAM_READER_LE
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    for (i = 0; i < buf_size; i++)
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        buf[i] = ff_reverse[buf[i]];
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#endif
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    if ((ret = init_get_bits8(&s->gb, buf + start, buf_size - start)) < 0)
        return ret;
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    ltab = buf[0x22] & 3;
    ctab = buf[0x22] >> 2;
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    if (ctab > 3) {
        av_log(avctx, AV_LOG_ERROR, "ctab %d is invalid\n", ctab);
        return AVERROR_INVALIDDATA;
    }

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    if (s->decode_delta) { /* intraframe */
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        if ((ret = ir2_decode_plane(s, avctx->width, avctx->height,
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                                    p->data[0], p->linesize[0],
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                                    ir2_delta_table[ltab])) < 0)
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            return ret;

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        /* swapped U and V */
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        if ((ret = ir2_decode_plane(s, avctx->width >> 2, avctx->height >> 2,
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                                    p->data[2], p->linesize[2],
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                                    ir2_delta_table[ctab])) < 0)
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            return ret;
        if ((ret = ir2_decode_plane(s, avctx->width >> 2, avctx->height >> 2,
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                                    p->data[1], p->linesize[1],
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                                    ir2_delta_table[ctab])) < 0)
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            return ret;
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    } else { /* interframe */
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        if ((ret = ir2_decode_plane_inter(s, avctx->width, avctx->height,
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                                          p->data[0], p->linesize[0],
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                                          ir2_delta_table[ltab])) < 0)
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            return ret;
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        /* swapped U and V */
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        if ((ret = ir2_decode_plane_inter(s, avctx->width >> 2, avctx->height >> 2,
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                                          p->data[2], p->linesize[2],
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                                          ir2_delta_table[ctab])) < 0)
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            return ret;
        if ((ret = ir2_decode_plane_inter(s, avctx->width >> 2, avctx->height >> 2,
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                                          p->data[1], p->linesize[1],
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                                          ir2_delta_table[ctab])) < 0)
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            return ret;
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    }

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    if ((ret = av_frame_ref(picture, p)) < 0)
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        return ret;

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    *got_frame = 1;
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    return buf_size;
}

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static av_cold int ir2_decode_init(AVCodecContext *avctx)
{
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    Ir2Context * const ic = avctx->priv_data;
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    static VLC_TYPE vlc_tables[1 << CODE_VLC_BITS][2];
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    ic->avctx = avctx;

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    avctx->pix_fmt= AV_PIX_FMT_YUV410P;
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    ic->picture = av_frame_alloc();
    if (!ic->picture)
        return AVERROR(ENOMEM);
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    ir2_vlc.table = vlc_tables;
    ir2_vlc.table_allocated = 1 << CODE_VLC_BITS;
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#ifdef BITSTREAM_READER_LE
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        init_vlc(&ir2_vlc, CODE_VLC_BITS, IR2_CODES,
                 &ir2_codes[0][1], 4, 2,
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                 &ir2_codes[0][0], 4, 2, INIT_VLC_USE_NEW_STATIC | INIT_VLC_LE);
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#else
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        init_vlc(&ir2_vlc, CODE_VLC_BITS, IR2_CODES,
                 &ir2_codes[0][1], 4, 2,
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                 &ir2_codes[0][0], 4, 2, INIT_VLC_USE_NEW_STATIC);
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#endif
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    return 0;
}

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static av_cold int ir2_decode_end(AVCodecContext *avctx)
{
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    Ir2Context * const ic = avctx->priv_data;

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    av_frame_free(&ic->picture);
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    return 0;
}

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AVCodec ff_indeo2_decoder = {
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    .name           = "indeo2",
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    .long_name      = NULL_IF_CONFIG_SMALL("Intel Indeo 2"),
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    .type           = AVMEDIA_TYPE_VIDEO,
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    .id             = AV_CODEC_ID_INDEO2,
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    .priv_data_size = sizeof(Ir2Context),
    .init           = ir2_decode_init,
    .close          = ir2_decode_end,
    .decode         = ir2_decode_frame,
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    .capabilities   = AV_CODEC_CAP_DR1,
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};