/* * 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, (AVPicture*)s->frame, 8, &s->gb); break; case MKTAG('A', 'A', 'S', 'C'): switch (compr) { case 0: stride = (avctx->width * psize + psize) & ~psize; for (i = avctx->height - 1; i >= 0; i--) { if (avctx->width * psize > buf_size) { av_log(avctx, AV_LOG_ERROR, "Next line is beyond buffer bounds\n"); break; } 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, (AVPicture*)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 buf_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", .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 = CODEC_CAP_DR1, .long_name = NULL_IF_CONFIG_SMALL("Autodesk RLE"), };