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ffmpeg / libavcodec / iff.c @ 005caa34

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/*
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 * IFF PBM/ILBM bitmap decoder
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 * Copyright (c) 2010 Peter Ross <pross@xvid.org>
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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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/**
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 * @file libavcodec/iff.c
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 * IFF PBM/ILBM bitmap decoder
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 */
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#include "bytestream.h"
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#include "avcodec.h"
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#include "get_bits.h"
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typedef struct {
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    AVFrame frame;
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    int planesize;
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    uint8_t * planebuf;
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} IffContext;
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/**
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 * Convert CMAP buffer (stored in extradata) to lavc palette format
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 */
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int ff_cmap_read_palette(AVCodecContext *avctx, uint32_t *pal)
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{
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    int count, i;
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    if (avctx->bits_per_coded_sample > 8) {
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        av_log(avctx, AV_LOG_ERROR, "bit_per_coded_sample > 8 not supported\n");
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        return AVERROR_INVALIDDATA;
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    }
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    count = 1 << avctx->bits_per_coded_sample;
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    if (avctx->extradata_size < count * 3) {
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        av_log(avctx, AV_LOG_ERROR, "palette data underflow\n");
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        return AVERROR_INVALIDDATA;
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    }
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    for (i=0; i < count; i++) {
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        pal[i] = 0xFF000000 | AV_RB24( avctx->extradata + i*3 );
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    }
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    return 0;
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}
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static av_cold int decode_init(AVCodecContext *avctx)
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{
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    IffContext *s = avctx->priv_data;
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    if (avctx->bits_per_coded_sample <= 8) {
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        avctx->pix_fmt = PIX_FMT_PAL8;
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    } else if (avctx->bits_per_coded_sample <= 32) {
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        avctx->pix_fmt = PIX_FMT_BGR32;
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    } else {
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        return AVERROR_INVALIDDATA;
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    }
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    s->planesize = avctx->width / 8;
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    s->planebuf = av_malloc(s->planesize + FF_INPUT_BUFFER_PADDING_SIZE);
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    if (!s->planebuf)
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        return AVERROR(ENOMEM);
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    s->frame.reference = 1;
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    if (avctx->get_buffer(avctx, &s->frame) < 0) {
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        av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
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        return AVERROR_UNKNOWN;
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    }
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    return avctx->bits_per_coded_sample <= 8 ?
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       ff_cmap_read_palette(avctx, (uint32_t*)s->frame.data[1]) : 0;
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}
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/**
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 * Decode interleaved plane buffer
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 * @param dst Destination buffer
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 * @param buf Source buffer
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 * @param buf_size
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 * @param bps bits_per_coded_sample
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 * @param plane plane number to decode as
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 */
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#define DECLARE_DECODEPLANE(suffix, type) \
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static void decodeplane##suffix(void *dst, const uint8_t const *buf, int buf_size, int bps, int plane) \
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{ \
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    GetBitContext gb; \
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    int i, b; \
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    init_get_bits(&gb, buf, buf_size * 8); \
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    for(i = 0; i < (buf_size * 8 + bps - 1) / bps; i++) { \
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        for (b = 0; b < bps; b++) { \
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            ((type *)dst)[ i*bps + b ] |= get_bits1(&gb) << plane; \
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        } \
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    } \
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}
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DECLARE_DECODEPLANE(8, uint8_t)
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DECLARE_DECODEPLANE(32, uint32_t)
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static int decode_frame_ilbm(AVCodecContext *avctx,
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                            void *data, int *data_size,
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                            AVPacket *avpkt)
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{
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    IffContext *s = avctx->priv_data;
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    const uint8_t *buf = avpkt->data;
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    int buf_size = avpkt->size;
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    int y, plane;
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    if (avctx->reget_buffer(avctx, &s->frame) < 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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    if (buf_size < avctx->width * avctx->height) {
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        av_log(avctx, AV_LOG_ERROR, "buffer underflow\n");
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        return -1;
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    }
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    for(y = 0; y < avctx->height; y++ ) {
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        uint8_t *row = &s->frame.data[0][ y*s->frame.linesize[0] ];
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        memset(row, 0, avctx->pix_fmt == PIX_FMT_PAL8 ? avctx->width : (avctx->width * 4));
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        for (plane = 0; plane < avctx->bits_per_coded_sample; plane++) {
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            if (avctx->pix_fmt == PIX_FMT_PAL8) {
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                decodeplane8(row, buf, s->planesize, avctx->bits_per_coded_sample, plane);
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            } else { // PIX_FMT_BGR32
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                decodeplane32(row, buf, s->planesize, avctx->bits_per_coded_sample, plane);
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            }
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            buf += s->planesize;
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        }
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    }
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    *data_size = sizeof(AVFrame);
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    *(AVFrame*)data = s->frame;
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    return buf_size;
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}
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static int decode_frame_byterun1(AVCodecContext *avctx,
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                            void *data, int *data_size,
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                            AVPacket *avpkt)
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{
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    IffContext *s = avctx->priv_data;
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    const uint8_t *buf = avpkt->data;
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    int buf_size = avpkt->size;
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    const uint8_t *buf_end = buf+buf_size;
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    int y, plane, x;
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    if (avctx->reget_buffer(avctx, &s->frame) < 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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    for(y = 0; y < avctx->height ; y++ ) {
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        uint8_t *row = &s->frame.data[0][ y*s->frame.linesize[0] ];
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        if (avctx->codec_tag == MKTAG('I','L','B','M')) { //interleaved
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            memset(row, 0, avctx->pix_fmt == PIX_FMT_PAL8 ? avctx->width : (avctx->width * 4));
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            for (plane = 0; plane < avctx->bits_per_coded_sample; plane++) {
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                for(x = 0; x < s->planesize && buf < buf_end; ) {
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                    int8_t value = *buf++;
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                    int length;
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                    if (value >= 0) {
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                        length = value + 1;
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                        memcpy(s->planebuf + x, buf, FFMIN3(length, s->planesize - x, buf_end - buf));
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                        buf += length;
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                    } else if (value > -128) {
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                        length = -value + 1;
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                        memset(s->planebuf + x, *buf++, FFMIN(length, s->planesize - x));
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                    } else { //noop
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                        continue;
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                    }
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                    x += length;
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                }
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                if (avctx->pix_fmt == PIX_FMT_PAL8) {
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                    decodeplane8(row, s->planebuf, s->planesize, avctx->bits_per_coded_sample, plane);
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                } else { //PIX_FMT_BGR32
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                    decodeplane32(row, s->planebuf, s->planesize, avctx->bits_per_coded_sample, plane);
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                }
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            }
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        } else {
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            for(x = 0; x < avctx->width && buf < buf_end; ) {
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                int8_t value = *buf++;
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                int length;
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                if (value >= 0) {
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                    length = value + 1;
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                    memcpy(row + x, buf, FFMIN3(length, buf_end - buf, avctx->width - x));
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                    buf += length;
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                } else if (value > -128) {
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                    length = -value + 1;
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                    memset(row + x, *buf++, FFMIN(length, avctx->width - x));
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                } else { //noop
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                    continue;
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                }
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                x += length;
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            }
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        }
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    }
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    *data_size = sizeof(AVFrame);
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    *(AVFrame*)data = s->frame;
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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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{
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    IffContext *s = avctx->priv_data;
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    if (s->frame.data[0])
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        avctx->release_buffer(avctx, &s->frame);
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    av_freep(&s->planebuf);
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    return 0;
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}
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AVCodec iff_ilbm_decoder = {
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    "iff_ilbm",
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    CODEC_TYPE_VIDEO,
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    CODEC_ID_IFF_ILBM,
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    sizeof(IffContext),
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    decode_init,
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    NULL,
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    decode_end,
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    decode_frame_ilbm,
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    CODEC_CAP_DR1,
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    .long_name = NULL_IF_CONFIG_SMALL("IFF ILBM"),
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};
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AVCodec iff_byterun1_decoder = {
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    "iff_byterun1",
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    CODEC_TYPE_VIDEO,
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    CODEC_ID_IFF_BYTERUN1,
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    sizeof(IffContext),
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    decode_init,
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    NULL,
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    decode_end,
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    decode_frame_byterun1,
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    CODEC_CAP_DR1,
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    .long_name = NULL_IF_CONFIG_SMALL("IFF ByteRun1"),
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};