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/* |
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* Sun Rasterfile (.sun/.ras/im{1,8,24}/.sunras) image decoder |
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* Copyright (c) 2007, 2008 Ivo van Poorten |
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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 "libavutil/common.h" |
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#include "libavutil/intreadwrite.h" |
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#include "libavutil/imgutils.h" |
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#include "avcodec.h" |
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#include "internal.h" |
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#include "sunrast.h" |
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static int sunrast_decode_frame(AVCodecContext *avctx, void *data, |
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int *got_frame, AVPacket *avpkt) |
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{ |
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const uint8_t *buf = avpkt->data; |
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const uint8_t *buf_end = avpkt->data + avpkt->size; |
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AVFrame * const p = data; |
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unsigned int w, h, depth, type, maptype, maplength, stride, x, y, len, alen; |
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uint8_t *ptr, *ptr2 = NULL; |
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const uint8_t *bufstart = buf; |
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int ret; |
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✗✓ |
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if (avpkt->size < 32) |
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return AVERROR_INVALIDDATA; |
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✗✓ |
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if (AV_RB32(buf) != RAS_MAGIC) { |
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av_log(avctx, AV_LOG_ERROR, "this is not sunras encoded data\n"); |
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return AVERROR_INVALIDDATA; |
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} |
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w = AV_RB32(buf + 4); |
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h = AV_RB32(buf + 8); |
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depth = AV_RB32(buf + 12); |
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type = AV_RB32(buf + 20); |
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maptype = AV_RB32(buf + 24); |
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maplength = AV_RB32(buf + 28); |
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buf += 32; |
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✗✓ |
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if (type == RT_EXPERIMENTAL) { |
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avpriv_request_sample(avctx, "TIFF/IFF/EXPERIMENTAL (compression) type"); |
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return AVERROR_PATCHWELCOME; |
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} |
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✗✓ |
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if (type > RT_FORMAT_IFF) { |
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av_log(avctx, AV_LOG_ERROR, "invalid (compression) type\n"); |
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return AVERROR_INVALIDDATA; |
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} |
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✗✓ |
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if (maptype == RMT_RAW) { |
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avpriv_request_sample(avctx, "Unknown colormap type"); |
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return AVERROR_PATCHWELCOME; |
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} |
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✗✓ |
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if (maptype > RMT_RAW) { |
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av_log(avctx, AV_LOG_ERROR, "invalid colormap type\n"); |
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return AVERROR_INVALIDDATA; |
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} |
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✓✗✗✓
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if (type == RT_FORMAT_TIFF || type == RT_FORMAT_IFF) { |
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av_log(avctx, AV_LOG_ERROR, "unsupported (compression) type\n"); |
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return AVERROR_PATCHWELCOME; |
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} |
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✓✗✓✓ ✗✗ |
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switch (depth) { |
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case 1: |
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✗✓ |
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avctx->pix_fmt = maplength ? AV_PIX_FMT_PAL8 : AV_PIX_FMT_MONOWHITE; |
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break; |
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case 4: |
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avctx->pix_fmt = maplength ? AV_PIX_FMT_PAL8 : AV_PIX_FMT_NONE; |
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break; |
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case 8: |
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✓✓ |
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avctx->pix_fmt = maplength ? AV_PIX_FMT_PAL8 : AV_PIX_FMT_GRAY8; |
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break; |
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case 24: |
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✗✓ |
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avctx->pix_fmt = (type == RT_FORMAT_RGB) ? AV_PIX_FMT_RGB24 : AV_PIX_FMT_BGR24; |
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break; |
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case 32: |
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avctx->pix_fmt = (type == RT_FORMAT_RGB) ? AV_PIX_FMT_0RGB : AV_PIX_FMT_0BGR; |
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break; |
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default: |
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av_log(avctx, AV_LOG_ERROR, "invalid depth\n"); |
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return AVERROR_INVALIDDATA; |
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} |
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ret = ff_set_dimensions(avctx, w, h); |
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✗✓ |
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if (ret < 0) |
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return ret; |
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/* scanlines are aligned on 16 bit boundaries */ |
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len = (depth * w + 7) >> 3; |
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alen = len + (len & 1); |
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✗✓ |
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if (buf_end - buf < maplength + (len * h) * 3 / 256) |
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return AVERROR_INVALIDDATA; |
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✗✓ |
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if ((ret = ff_get_buffer(avctx, p, 0)) < 0) |
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return ret; |
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p->pict_type = AV_PICTURE_TYPE_I; |
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✓✓✗✓
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if (depth > 8 && maplength) { |
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av_log(avctx, AV_LOG_WARNING, "useless colormap found or file is corrupted, trying to recover\n"); |
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✓✓ |
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} else if (maplength) { |
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unsigned int len = maplength / 3; |
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✓✗✗✓
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if (maplength % 3 || maplength > 768) { |
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av_log(avctx, AV_LOG_WARNING, "invalid colormap length\n"); |
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return AVERROR_INVALIDDATA; |
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} |
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ptr = p->data[1]; |
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✓✓ |
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for (x = 0; x < len; x++, ptr += 4) |
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*(uint32_t *)ptr = (0xFFU<<24) + (buf[x]<<16) + (buf[len+x]<<8) + buf[len+len+x]; |
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} |
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buf += maplength; |
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✓✓✗✓
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if (maplength && depth < 8) { |
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ptr = ptr2 = av_malloc_array((w + 15), h); |
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if (!ptr) |
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return AVERROR(ENOMEM); |
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stride = (w + 15 >> 3) * depth; |
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} else { |
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ptr = p->data[0]; |
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stride = p->linesize[0]; |
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} |
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✓✓ |
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if (type == RT_BYTE_ENCODED) { |
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int value, run; |
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uint8_t *end = ptr + h * stride; |
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x = 0; |
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✓✓✓✗
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while (ptr != end && buf < buf_end) { |
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run = 1; |
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✗✓ |
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if (buf_end - buf < 1) |
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return AVERROR_INVALIDDATA; |
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✓✓ |
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if ((value = *buf++) == RLE_TRIGGER) { |
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run = *buf++ + 1; |
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✓✓ |
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if (run != 1) |
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value = *buf++; |
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} |
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✓✓ |
12760210 |
while (run--) { |
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✓✗ |
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if (x < len) |
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ptr[x] = value; |
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✓✓ |
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if (++x >= alen) { |
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x = 0; |
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ptr += stride; |
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✓✓ |
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if (ptr == end) |
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break; |
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} |
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} |
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} |
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} else { |
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✓✓ |
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for (y = 0; y < h; y++) { |
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✗✓ |
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if (buf_end - buf < alen) |
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break; |
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memcpy(ptr, buf, len); |
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ptr += stride; |
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buf += alen; |
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} |
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} |
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✓✓✗✓
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if (avctx->pix_fmt == AV_PIX_FMT_PAL8 && depth < 8) { |
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uint8_t *ptr_free = ptr2; |
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ptr = p->data[0]; |
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for (y=0; y<h; y++) { |
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for (x = 0; x < (w + 7 >> 3) * depth; x++) { |
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if (depth == 1) { |
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ptr[8*x] = ptr2[x] >> 7; |
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ptr[8*x+1] = ptr2[x] >> 6 & 1; |
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ptr[8*x+2] = ptr2[x] >> 5 & 1; |
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ptr[8*x+3] = ptr2[x] >> 4 & 1; |
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ptr[8*x+4] = ptr2[x] >> 3 & 1; |
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ptr[8*x+5] = ptr2[x] >> 2 & 1; |
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ptr[8*x+6] = ptr2[x] >> 1 & 1; |
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ptr[8*x+7] = ptr2[x] & 1; |
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} else { |
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ptr[2*x] = ptr2[x] >> 4; |
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ptr[2*x+1] = ptr2[x] & 0xF; |
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} |
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} |
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ptr += p->linesize[0]; |
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ptr2 += (w + 15 >> 3) * depth; |
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} |
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av_freep(&ptr_free); |
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} |
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*got_frame = 1; |
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return buf - bufstart; |
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} |
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AVCodec ff_sunrast_decoder = { |
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.name = "sunrast", |
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.long_name = NULL_IF_CONFIG_SMALL("Sun Rasterfile image"), |
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.type = AVMEDIA_TYPE_VIDEO, |
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.id = AV_CODEC_ID_SUNRAST, |
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.decode = sunrast_decode_frame, |
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.capabilities = AV_CODEC_CAP_DR1, |
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}; |