/* * Autodesk RLE Decoder * Copyright (C) 2005 The FFmpeg project * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * 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 * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** * @file * Autodesk RLE Video Decoder by Konstantin Shishkov */ #include <stdio.h>#include <stdlib.h>#include <string.h> #include "avcodec.h"#include "internal.h"#include "msrledec.h" typedef struct AascContext {    AVCodecContext *avctx;    GetByteContext gb;    AVFrame *frame;     uint32_t palette[AVPALETTE_COUNT];    int palette_size;} AascContext; static av_cold int aasc_decode_init(AVCodecContext *avctx){    AascContext *s = avctx->priv_data;    uint8_t *ptr;    int i;     s->avctx = avctx;    switch (avctx->bits_per_coded_sample) {    case 8:        avctx->pix_fmt = AV_PIX_FMT_PAL8;         ptr = avctx->extradata;        s->palette_size = FFMIN(avctx->extradata_size, AVPALETTE_SIZE);        for (i = 0; i < s->palette_size / 4; i++) {            s->palette[i] = 0xFFU << 24 | AV_RL32(ptr);            ptr += 4;        }        break;    case 16:        avctx->pix_fmt = AV_PIX_FMT_RGB555LE;        break;    case 24:        avctx->pix_fmt = AV_PIX_FMT_BGR24;        break;    default:        av_log(avctx, AV_LOG_ERROR, "Unsupported bit depth: %d\n", avctx->bits_per_coded_sample);        return -1;    }     s->frame = av_frame_alloc();    if (!s->frame)        return AVERROR(ENOMEM);     return 0;} static int aasc_decode_frame(AVCodecContext *avctx,                              void *data, int *got_frame,                              AVPacket *avpkt){    const uint8_t *buf = avpkt->data;    int buf_size       = avpkt->size;    AascContext *s     = avctx->priv_data;    int compr, i, stride, psize, ret;     if (buf_size < 4) {        av_log(avctx, AV_LOG_ERROR, "frame too short\n");        return AVERROR_INVALIDDATA;    }     if ((ret = ff_reget_buffer(avctx, s->frame)) < 0)        return ret;     compr     = AV_RL32(buf);    buf      += 4;    buf_size -= 4;    psize = avctx->bits_per_coded_sample / 8;    switch (avctx->codec_tag) {    case MKTAG('A', 'A', 'S', '4'):        bytestream2_init(&s->gb, buf - 4, buf_size + 4);        ff_msrle_decode(avctx, s->frame, 8, &s->gb);        break;    case MKTAG('A', 'A', 'S', 'C'):    switch (compr) {    case 0:        stride = (avctx->width * psize + psize) & ~psize;        if (buf_size < stride * avctx->height)            return AVERROR_INVALIDDATA;        for (i = avctx->height - 1; i >= 0; i--) {            memcpy(s->frame->data[0] + i * s->frame->linesize[0], buf, avctx->width * psize);            buf += stride;            buf_size -= stride;        }        break;    case 1:        bytestream2_init(&s->gb, buf, buf_size);        ff_msrle_decode(avctx, s->frame, 8, &s->gb);        break;    default:        av_log(avctx, AV_LOG_ERROR, "Unknown compression type %d\n", compr);        return AVERROR_INVALIDDATA;    }        break;    default:        av_log(avctx, AV_LOG_ERROR, "Unknown FourCC: %X\n", avctx->codec_tag);        return -1;    }     if (avctx->pix_fmt == AV_PIX_FMT_PAL8)        memcpy(s->frame->data[1], s->palette, s->palette_size);     *got_frame = 1;    if ((ret = av_frame_ref(data, s->frame)) < 0)        return ret;     /* report that the buffer was completely consumed */    return avpkt->size;} static av_cold int aasc_decode_end(AVCodecContext *avctx){    AascContext *s = avctx->priv_data;     av_frame_free(&s->frame);     return 0;} AVCodec ff_aasc_decoder = {    .name           = "aasc",    .long_name      = NULL_IF_CONFIG_SMALL("Autodesk RLE"),    .type           = AVMEDIA_TYPE_VIDEO,    .id             = AV_CODEC_ID_AASC,    .priv_data_size = sizeof(AascContext),    .init           = aasc_decode_init,    .close          = aasc_decode_end,    .decode         = aasc_decode_frame,    .capabilities   = AV_CODEC_CAP_DR1,    .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE,};