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ffmpeg / libavcodec / qdrw.c @ 72415b2a

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/*
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 * QuickDraw (qdrw) codec
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 * Copyright (c) 2004 Konstantin Shishkov
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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/qdrw.c
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 * Apple QuickDraw codec.
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 */
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#include "libavutil/intreadwrite.h"
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#include "avcodec.h"
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typedef struct QdrawContext{
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    AVCodecContext *avctx;
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    AVFrame pic;
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} QdrawContext;
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static int decode_frame(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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    const uint8_t *buf = avpkt->data;
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    int buf_size = avpkt->size;
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    QdrawContext * const a = avctx->priv_data;
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    AVFrame * const p= (AVFrame*)&a->pic;
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    uint8_t* outdata;
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    int colors;
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    int i;
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    uint32_t *pal;
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    int r, g, b;
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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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    outdata = a->pic.data[0];
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    buf += 0x68; /* jump to palette */
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    colors = AV_RB32(buf);
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    buf += 4;
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    if(colors < 0 || colors > 256) {
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        av_log(avctx, AV_LOG_ERROR, "Error color count - %i(0x%X)\n", colors, colors);
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        return -1;
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    }
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    pal = (uint32_t*)p->data[1];
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    for (i = 0; i <= colors; i++) {
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        unsigned int idx;
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        idx = AV_RB16(buf); /* color index */
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        buf += 2;
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        if (idx > 255) {
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            av_log(avctx, AV_LOG_ERROR, "Palette index out of range: %u\n", idx);
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            buf += 6;
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            continue;
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        }
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        r = *buf++;
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        buf++;
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        g = *buf++;
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        buf++;
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        b = *buf++;
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        buf++;
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        pal[idx] = (r << 16) | (g << 8) | b;
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    }
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    p->palette_has_changed = 1;
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    buf += 18; /* skip unneeded data */
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    for (i = 0; i < avctx->height; i++) {
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        int size, left, code, pix;
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        const uint8_t *next;
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        uint8_t *out;
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        int tsize = 0;
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        /* decode line */
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        out = outdata;
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        size = AV_RB16(buf); /* size of packed line */
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        buf += 2;
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        left = size;
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        next = buf + size;
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        while (left > 0) {
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            code = *buf++;
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            if (code & 0x80 ) { /* run */
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                pix = *buf++;
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                if ((out + (257 - code)) > (outdata +  a->pic.linesize[0]))
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                    break;
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                memset(out, pix, 257 - code);
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                out += 257 - code;
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                tsize += 257 - code;
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                left -= 2;
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            } else { /* copy */
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                if ((out + code) > (outdata +  a->pic.linesize[0]))
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                    break;
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                memcpy(out, buf, code + 1);
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                out += code + 1;
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                buf += code + 1;
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                left -= 2 + code;
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                tsize += code + 1;
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            }
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        }
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        buf = next;
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        outdata += a->pic.linesize[0];
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    }
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    *data_size = sizeof(AVFrame);
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    *(AVFrame*)data = a->pic;
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    return buf_size;
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}
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static av_cold int decode_init(AVCodecContext *avctx){
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//    QdrawContext * const a = avctx->priv_data;
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    avctx->pix_fmt= PIX_FMT_PAL8;
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    return 0;
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}
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static av_cold int decode_end(AVCodecContext *avctx){
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    QdrawContext * const a = avctx->priv_data;
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    AVFrame *pic = &a->pic;
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    if (pic->data[0])
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        avctx->release_buffer(avctx, pic);
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    return 0;
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}
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AVCodec qdraw_decoder = {
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    "qdraw",
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    AVMEDIA_TYPE_VIDEO,
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    CODEC_ID_QDRAW,
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    sizeof(QdrawContext),
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    decode_init,
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    NULL,
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    decode_end,
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    decode_frame,
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    CODEC_CAP_DR1,
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    .long_name = NULL_IF_CONFIG_SMALL("Apple QuickDraw"),
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};