GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/mscc.c Lines: 0 143 0.0 %
Date: 2019-11-22 03:34:36 Branches: 0 68 0.0 %

Line Branch Exec Source
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/*
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 * Mandsoft Screen Capture Codec decoder
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 *
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 * Copyright (c) 2017 Paul B Mahol
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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 <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "avcodec.h"
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#include "bytestream.h"
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#include "internal.h"
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#include <zlib.h>
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typedef struct MSCCContext {
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    unsigned          bpp;
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    unsigned int      decomp_size;
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    uint8_t          *decomp_buf;
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    unsigned int      uncomp_size;
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    uint8_t          *uncomp_buf;
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    z_stream          zstream;
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    uint32_t          pal[256];
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} MSCCContext;
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static int rle_uncompress(AVCodecContext *avctx, GetByteContext *gb, PutByteContext *pb)
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{
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    MSCCContext *s = avctx->priv_data;
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    unsigned x = 0, y = 0;
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    while (bytestream2_get_bytes_left(gb) > 0) {
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        uint32_t fill;
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        int j;
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        unsigned run = bytestream2_get_byte(gb);
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        if (run) {
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            switch (avctx->bits_per_coded_sample) {
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            case 8:
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                fill = bytestream2_get_byte(gb);
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                break;
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            case 16:
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                fill = bytestream2_get_le16(gb);
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                break;
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            case 24:
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                fill = bytestream2_get_le24(gb);
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                break;
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            case 32:
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                fill = bytestream2_get_le32(gb);
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                break;
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            }
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            for (j = 0; j < run; j++) {
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                switch (avctx->bits_per_coded_sample) {
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                case 8:
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                    bytestream2_put_byte(pb, fill);
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                    break;
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                case 16:
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                    bytestream2_put_le16(pb, fill);
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                    break;
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                case 24:
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                    bytestream2_put_le24(pb, fill);
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                    break;
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                case 32:
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                    bytestream2_put_le32(pb, fill);
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                    break;
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                }
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            }
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            x += run;
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        } else {
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            unsigned copy = bytestream2_get_byte(gb);
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            if (copy == 0) {
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                x = 0;
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                y++;
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                bytestream2_seek_p(pb, y * avctx->width * s->bpp, SEEK_SET);
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            } else if (copy == 1) {
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                return 0;
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            } else if (copy == 2) {
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                x += bytestream2_get_byte(gb);
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                y += bytestream2_get_byte(gb);
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                bytestream2_seek_p(pb, y * avctx->width * s->bpp + x * s->bpp, SEEK_SET);
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            } else {
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                for (j = 0; j < copy; j++) {
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                    switch (avctx->bits_per_coded_sample) {
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                    case 8:
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                        bytestream2_put_byte(pb, bytestream2_get_byte(gb));
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                        break;
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                    case 16:
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                        bytestream2_put_le16(pb, bytestream2_get_le16(gb));
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                        break;
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                    case 24:
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                        bytestream2_put_le24(pb, bytestream2_get_le24(gb));
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                        break;
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                    case 32:
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                        bytestream2_put_le32(pb, bytestream2_get_le32(gb));
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                        break;
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                    }
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                }
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                if (s->bpp == 1 && (copy & 1))
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                    bytestream2_skip(gb, 1);
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                x += copy;
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            }
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        }
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    }
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    return AVERROR_INVALIDDATA;
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}
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static int decode_frame(AVCodecContext *avctx,
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                        void *data, int *got_frame,
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                        AVPacket *avpkt)
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{
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    MSCCContext *s = avctx->priv_data;
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    AVFrame *frame = data;
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    uint8_t *buf = avpkt->data;
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    int buf_size = avpkt->size;
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    GetByteContext gb;
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    PutByteContext pb;
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    int ret, j;
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    if (avpkt->size < 3)
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        return buf_size;
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    if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
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        return ret;
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    if (avctx->codec_id == AV_CODEC_ID_MSCC) {
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        avpkt->data[2] ^= avpkt->data[0];
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        buf += 2;
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        buf_size -= 2;
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    }
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    if (avctx->pix_fmt == AV_PIX_FMT_PAL8) {
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        int size;
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        const uint8_t *pal = av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE, &size);
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        if (pal && size == AVPALETTE_SIZE) {
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            frame->palette_has_changed = 1;
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            for (j = 0; j < 256; j++)
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                s->pal[j] = 0xFF000000 | AV_RL32(pal + j * 4);
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        } else if (pal) {
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            av_log(avctx, AV_LOG_ERROR, "Palette size %d is wrong\n", size);
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        }
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        memcpy(frame->data[1], s->pal, AVPALETTE_SIZE);
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    }
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    ret = inflateReset(&s->zstream);
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    if (ret != Z_OK) {
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        av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", ret);
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        return AVERROR_UNKNOWN;
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    }
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    s->zstream.next_in   = buf;
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    s->zstream.avail_in  = buf_size;
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    s->zstream.next_out  = s->decomp_buf;
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    s->zstream.avail_out = s->decomp_size;
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    ret = inflate(&s->zstream, Z_FINISH);
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    if (ret != Z_STREAM_END) {
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        av_log(avctx, AV_LOG_ERROR, "Inflate error: %d\n", ret);
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        return AVERROR_UNKNOWN;
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    }
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    bytestream2_init(&gb, s->decomp_buf, s->zstream.total_out);
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    bytestream2_init_writer(&pb, s->uncomp_buf, s->uncomp_size);
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    ret = rle_uncompress(avctx, &gb, &pb);
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    if (ret)
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        return ret;
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    for (j = 0; j < avctx->height; j++) {
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        memcpy(frame->data[0] + (avctx->height - j - 1) * frame->linesize[0],
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               s->uncomp_buf + s->bpp * j * avctx->width, s->bpp * avctx->width);
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    }
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    frame->key_frame = 1;
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    frame->pict_type = AV_PICTURE_TYPE_I;
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    *got_frame = 1;
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    return avpkt->size;
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}
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static av_cold int decode_init(AVCodecContext *avctx)
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{
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    MSCCContext *s = avctx->priv_data;
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    int stride, zret;
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    switch (avctx->bits_per_coded_sample) {
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    case  8: avctx->pix_fmt = AV_PIX_FMT_PAL8;   break;
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    case 16: avctx->pix_fmt = AV_PIX_FMT_RGB555; break;
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    case 24: avctx->pix_fmt = AV_PIX_FMT_BGR24;  break;
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    case 32: avctx->pix_fmt = AV_PIX_FMT_BGRA;   break;
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    default:
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        av_log(avctx, AV_LOG_ERROR, "Unsupported bitdepth %i\n", avctx->bits_per_coded_sample);
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        return AVERROR_INVALIDDATA;
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    }
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    s->bpp = avctx->bits_per_coded_sample >> 3;
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    stride = 4 * ((avctx->width * avctx->bits_per_coded_sample + 31) / 32);
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    s->decomp_size = 2 * avctx->height * stride;
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    if (!(s->decomp_buf = av_malloc(s->decomp_size)))
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        return AVERROR(ENOMEM);
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    s->uncomp_size = avctx->height * stride;
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    if (!(s->uncomp_buf = av_malloc(s->uncomp_size)))
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        return AVERROR(ENOMEM);
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    s->zstream.zalloc = Z_NULL;
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    s->zstream.zfree = Z_NULL;
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    s->zstream.opaque = Z_NULL;
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    zret = inflateInit(&s->zstream);
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    if (zret != Z_OK) {
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        av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret);
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        return AVERROR_UNKNOWN;
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    }
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    return 0;
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}
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static av_cold int decode_close(AVCodecContext *avctx)
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{
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    MSCCContext *s = avctx->priv_data;
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    av_freep(&s->decomp_buf);
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    s->decomp_size = 0;
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    av_freep(&s->uncomp_buf);
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    s->uncomp_size = 0;
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    inflateEnd(&s->zstream);
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    return 0;
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}
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AVCodec ff_mscc_decoder = {
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    .name             = "mscc",
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    .long_name        = NULL_IF_CONFIG_SMALL("Mandsoft Screen Capture Codec"),
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    .type             = AVMEDIA_TYPE_VIDEO,
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    .id               = AV_CODEC_ID_MSCC,
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    .priv_data_size   = sizeof(MSCCContext),
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    .init             = decode_init,
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    .close            = decode_close,
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    .decode           = decode_frame,
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    .capabilities     = AV_CODEC_CAP_DR1,
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    .caps_internal    = FF_CODEC_CAP_INIT_CLEANUP,
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};
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AVCodec ff_srgc_decoder = {
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    .name             = "srgc",
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    .long_name        = NULL_IF_CONFIG_SMALL("Screen Recorder Gold Codec"),
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    .type             = AVMEDIA_TYPE_VIDEO,
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    .id               = AV_CODEC_ID_SRGC,
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    .priv_data_size   = sizeof(MSCCContext),
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    .init             = decode_init,
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    .close            = decode_close,
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    .decode           = decode_frame,
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    .capabilities     = AV_CODEC_CAP_DR1,
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    .caps_internal    = FF_CODEC_CAP_INIT_CLEANUP,
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};