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ffmpeg / libavcodec / pnmdec.c @ 72415b2a

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/*
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 * PNM image format
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 * Copyright (c) 2002, 2003 Fabrice Bellard
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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 "avcodec.h"
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#include "bytestream.h"
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#include "put_bits.h"
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#include "pnm.h"
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static int pnm_decode_frame(AVCodecContext *avctx, void *data,
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                            int *data_size, AVPacket *avpkt)
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{
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    const uint8_t *buf   = avpkt->data;
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    int buf_size         = avpkt->size;
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    PNMContext * const s = avctx->priv_data;
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    AVFrame *picture     = data;
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    AVFrame * const p    = (AVFrame*)&s->picture;
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    int i, j, n, linesize, h, upgrade = 0;
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    unsigned char *ptr;
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    int components, sample_len;
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    s->bytestream_start =
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    s->bytestream       = buf;
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    s->bytestream_end   = buf + buf_size;
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    if (ff_pnm_decode_header(avctx, s) < 0)
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        return -1;
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    if (p->data[0])
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        avctx->release_buffer(avctx, p);
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    p->reference = 0;
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    if (avctx->get_buffer(avctx, p) < 0) {
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        av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
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        return -1;
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    }
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    p->pict_type = FF_I_TYPE;
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    p->key_frame = 1;
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    switch (avctx->pix_fmt) {
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    default:
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        return -1;
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    case PIX_FMT_RGB48BE:
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        n = avctx->width * 6;
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        components=3;
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        sample_len=16;
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        goto do_read;
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    case PIX_FMT_RGB24:
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        n = avctx->width * 3;
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        components=3;
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        sample_len=8;
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        goto do_read;
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    case PIX_FMT_GRAY8:
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        n = avctx->width;
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        components=1;
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        sample_len=8;
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        if (s->maxval < 255)
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            upgrade = 1;
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        goto do_read;
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    case PIX_FMT_GRAY16BE:
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    case PIX_FMT_GRAY16LE:
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        n = avctx->width * 2;
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        components=1;
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        sample_len=16;
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        if (s->maxval < 65535)
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            upgrade = 2;
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        goto do_read;
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    case PIX_FMT_MONOWHITE:
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    case PIX_FMT_MONOBLACK:
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        n = (avctx->width + 7) >> 3;
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        components=1;
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        sample_len=1;
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    do_read:
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        ptr      = p->data[0];
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        linesize = p->linesize[0];
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        if (s->bytestream + n * avctx->height > s->bytestream_end)
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            return -1;
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        if(s->type < 4){
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            for (i=0; i<avctx->height; i++) {
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                PutBitContext pb;
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                init_put_bits(&pb, ptr, linesize);
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                for(j=0; j<avctx->width * components; j++){
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                    unsigned int c=0;
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                    int v=0;
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                    while(s->bytestream < s->bytestream_end && (*s->bytestream < '0' || *s->bytestream > '9' ))
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                        s->bytestream++;
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                    if(s->bytestream >= s->bytestream_end)
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                        return -1;
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                    do{
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                        v= 10*v + c;
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                        c= (*s->bytestream++) - '0';
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                    }while(c <= 9);
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                    put_bits(&pb, sample_len, (((1<<sample_len)-1)*v + (s->maxval>>1))/s->maxval);
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                }
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                flush_put_bits(&pb);
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                ptr+= linesize;
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            }
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        }else{
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        for (i = 0; i < avctx->height; i++) {
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            if (!upgrade)
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                memcpy(ptr, s->bytestream, n);
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            else if (upgrade == 1) {
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                unsigned int j, f = (255 * 128 + s->maxval / 2) / s->maxval;
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                for (j = 0; j < n; j++)
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                    ptr[j] = (s->bytestream[j] * f + 64) >> 7;
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            } else if (upgrade == 2) {
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                unsigned int j, v, f = (65535 * 32768 + s->maxval / 2) / s->maxval;
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                for (j = 0; j < n / 2; j++) {
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                    v = be2me_16(((uint16_t *)s->bytestream)[j]);
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                    ((uint16_t *)ptr)[j] = (v * f + 16384) >> 15;
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                }
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            }
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            s->bytestream += n;
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            ptr           += linesize;
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        }
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        }
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        break;
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    case PIX_FMT_YUV420P:
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        {
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            unsigned char *ptr1, *ptr2;
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            n        = avctx->width;
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            ptr      = p->data[0];
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            linesize = p->linesize[0];
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            if (s->bytestream + n * avctx->height * 3 / 2 > s->bytestream_end)
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                return -1;
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            for (i = 0; i < avctx->height; i++) {
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                memcpy(ptr, s->bytestream, n);
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                s->bytestream += n;
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                ptr           += linesize;
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            }
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            ptr1 = p->data[1];
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            ptr2 = p->data[2];
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            n >>= 1;
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            h = avctx->height >> 1;
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            for (i = 0; i < h; i++) {
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                memcpy(ptr1, s->bytestream, n);
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                s->bytestream += n;
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                memcpy(ptr2, s->bytestream, n);
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                s->bytestream += n;
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                ptr1 += p->linesize[1];
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                ptr2 += p->linesize[2];
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            }
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        }
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        break;
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    case PIX_FMT_RGB32:
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        ptr      = p->data[0];
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        linesize = p->linesize[0];
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        if (s->bytestream + avctx->width * avctx->height * 4 > s->bytestream_end)
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            return -1;
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        for (i = 0; i < avctx->height; i++) {
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            int j, r, g, b, a;
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            for (j = 0; j < avctx->width; j++) {
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                r = *s->bytestream++;
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                g = *s->bytestream++;
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                b = *s->bytestream++;
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                a = *s->bytestream++;
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                ((uint32_t *)ptr)[j] = (a << 24) | (r << 16) | (g << 8) | b;
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            }
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            ptr += linesize;
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        }
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        break;
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    }
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    *picture   = *(AVFrame*)&s->picture;
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    *data_size = sizeof(AVPicture);
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    return s->bytestream - s->bytestream_start;
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}
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#if CONFIG_PGM_DECODER
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AVCodec pgm_decoder = {
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    "pgm",
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    AVMEDIA_TYPE_VIDEO,
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    CODEC_ID_PGM,
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    sizeof(PNMContext),
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    ff_pnm_init,
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    NULL,
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    ff_pnm_end,
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    pnm_decode_frame,
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    CODEC_CAP_DR1,
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    .pix_fmts  = (const enum PixelFormat[]){PIX_FMT_GRAY8, PIX_FMT_GRAY16BE, PIX_FMT_NONE},
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    .long_name = NULL_IF_CONFIG_SMALL("PGM (Portable GrayMap) image"),
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};
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#endif
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#if CONFIG_PGMYUV_DECODER
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AVCodec pgmyuv_decoder = {
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    "pgmyuv",
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    AVMEDIA_TYPE_VIDEO,
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    CODEC_ID_PGMYUV,
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    sizeof(PNMContext),
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    ff_pnm_init,
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    NULL,
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    ff_pnm_end,
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    pnm_decode_frame,
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    CODEC_CAP_DR1,
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    .pix_fmts  = (const enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_NONE},
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    .long_name = NULL_IF_CONFIG_SMALL("PGMYUV (Portable GrayMap YUV) image"),
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};
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#endif
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#if CONFIG_PPM_DECODER
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AVCodec ppm_decoder = {
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    "ppm",
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    AVMEDIA_TYPE_VIDEO,
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    CODEC_ID_PPM,
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    sizeof(PNMContext),
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    ff_pnm_init,
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    NULL,
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    ff_pnm_end,
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    pnm_decode_frame,
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    CODEC_CAP_DR1,
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    .pix_fmts  = (const enum PixelFormat[]){PIX_FMT_RGB24, PIX_FMT_RGB48BE, PIX_FMT_NONE},
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    .long_name = NULL_IF_CONFIG_SMALL("PPM (Portable PixelMap) image"),
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};
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#endif
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#if CONFIG_PBM_DECODER
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AVCodec pbm_decoder = {
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    "pbm",
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    AVMEDIA_TYPE_VIDEO,
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    CODEC_ID_PBM,
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    sizeof(PNMContext),
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    ff_pnm_init,
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    NULL,
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    ff_pnm_end,
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    pnm_decode_frame,
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    CODEC_CAP_DR1,
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    .pix_fmts  = (const enum PixelFormat[]){PIX_FMT_MONOWHITE, PIX_FMT_NONE},
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    .long_name = NULL_IF_CONFIG_SMALL("PBM (Portable BitMap) image"),
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};
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#endif
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#if CONFIG_PAM_DECODER
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AVCodec pam_decoder = {
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    "pam",
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    AVMEDIA_TYPE_VIDEO,
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    CODEC_ID_PAM,
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    sizeof(PNMContext),
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    ff_pnm_init,
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    NULL,
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    ff_pnm_end,
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    pnm_decode_frame,
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    CODEC_CAP_DR1,
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    .pix_fmts  = (const enum PixelFormat[]){PIX_FMT_RGB24, PIX_FMT_RGB32, PIX_FMT_GRAY8, PIX_FMT_MONOWHITE, PIX_FMT_NONE},
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    .long_name = NULL_IF_CONFIG_SMALL("PAM (Portable AnyMap) image"),
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};
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#endif