diff options
Diffstat (limited to 'ffmpeg/libavcodec/sunrast.c')
| -rw-r--r-- | ffmpeg/libavcodec/sunrast.c | 217 |
1 files changed, 217 insertions, 0 deletions
diff --git a/ffmpeg/libavcodec/sunrast.c b/ffmpeg/libavcodec/sunrast.c new file mode 100644 index 0000000..1e25b60 --- /dev/null +++ b/ffmpeg/libavcodec/sunrast.c @@ -0,0 +1,217 @@ +/* + * Sun Rasterfile (.sun/.ras/im{1,8,24}/.sunras) image decoder + * Copyright (c) 2007, 2008 Ivo van Poorten + * + * 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 + */ + +#include "libavutil/common.h" +#include "libavutil/intreadwrite.h" +#include "libavutil/imgutils.h" +#include "avcodec.h" +#include "internal.h" +#include "sunrast.h" + +static int sunrast_decode_frame(AVCodecContext *avctx, void *data, + int *got_frame, AVPacket *avpkt) +{ + const uint8_t *buf = avpkt->data; + const uint8_t *buf_end = avpkt->data + avpkt->size; + AVFrame * const p = data; + unsigned int w, h, depth, type, maptype, maplength, stride, x, y, len, alen; + uint8_t *ptr, *ptr2 = NULL; + const uint8_t *bufstart = buf; + int ret; + + if (avpkt->size < 32) + return AVERROR_INVALIDDATA; + + if (AV_RB32(buf) != RAS_MAGIC) { + av_log(avctx, AV_LOG_ERROR, "this is not sunras encoded data\n"); + return AVERROR_INVALIDDATA; + } + + w = AV_RB32(buf + 4); + h = AV_RB32(buf + 8); + depth = AV_RB32(buf + 12); + type = AV_RB32(buf + 20); + maptype = AV_RB32(buf + 24); + maplength = AV_RB32(buf + 28); + buf += 32; + + if (type == RT_EXPERIMENTAL) { + avpriv_request_sample(avctx, "TIFF/IFF/EXPERIMENTAL (compression) type"); + return AVERROR_PATCHWELCOME; + } + if (type > RT_FORMAT_IFF) { + av_log(avctx, AV_LOG_ERROR, "invalid (compression) type\n"); + return AVERROR_INVALIDDATA; + } + if (av_image_check_size(w, h, 0, avctx)) { + av_log(avctx, AV_LOG_ERROR, "invalid image size\n"); + return AVERROR_INVALIDDATA; + } + if (maptype == RMT_RAW) { + avpriv_request_sample(avctx, "Unknown colormap type"); + return AVERROR_PATCHWELCOME; + } + if (maptype > RMT_RAW) { + av_log(avctx, AV_LOG_ERROR, "invalid colormap type\n"); + return AVERROR_INVALIDDATA; + } + + if (type == RT_FORMAT_TIFF || type == RT_FORMAT_IFF) { + av_log(avctx, AV_LOG_ERROR, "unsupported (compression) type\n"); + return -1; + } + + switch (depth) { + case 1: + avctx->pix_fmt = maplength ? AV_PIX_FMT_PAL8 : AV_PIX_FMT_MONOWHITE; + break; + case 4: + avctx->pix_fmt = maplength ? AV_PIX_FMT_PAL8 : AV_PIX_FMT_NONE; + break; + case 8: + avctx->pix_fmt = maplength ? AV_PIX_FMT_PAL8 : AV_PIX_FMT_GRAY8; + break; + case 24: + avctx->pix_fmt = (type == RT_FORMAT_RGB) ? AV_PIX_FMT_RGB24 : AV_PIX_FMT_BGR24; + break; + case 32: + avctx->pix_fmt = (type == RT_FORMAT_RGB) ? AV_PIX_FMT_0RGB : AV_PIX_FMT_0BGR; + break; + default: + av_log(avctx, AV_LOG_ERROR, "invalid depth\n"); + return AVERROR_INVALIDDATA; + } + + if (w != avctx->width || h != avctx->height) + avcodec_set_dimensions(avctx, w, h); + if ((ret = ff_get_buffer(avctx, p, 0)) < 0) + return ret; + + p->pict_type = AV_PICTURE_TYPE_I; + + if (buf_end - buf < maplength) + return AVERROR_INVALIDDATA; + + if (depth > 8 && maplength) { + av_log(avctx, AV_LOG_WARNING, "useless colormap found or file is corrupted, trying to recover\n"); + + } else if (maplength) { + unsigned int len = maplength / 3; + + if (maplength % 3 || maplength > 768) { + av_log(avctx, AV_LOG_WARNING, "invalid colormap length\n"); + return AVERROR_INVALIDDATA; + } + + ptr = p->data[1]; + for (x = 0; x < len; x++, ptr += 4) + *(uint32_t *)ptr = (0xFFU<<24) + (buf[x]<<16) + (buf[len+x]<<8) + buf[len+len+x]; + } + + buf += maplength; + + if (maplength && depth < 8) { + ptr = ptr2 = av_malloc((w + 15) * h); + if (!ptr) + return AVERROR(ENOMEM); + stride = (w + 15 >> 3) * depth; + } else { + ptr = p->data[0]; + stride = p->linesize[0]; + } + + /* scanlines are aligned on 16 bit boundaries */ + len = (depth * w + 7) >> 3; + alen = len + (len & 1); + + if (type == RT_BYTE_ENCODED) { + int value, run; + uint8_t *end = ptr + h * stride; + + x = 0; + while (ptr != end && buf < buf_end) { + run = 1; + if (buf_end - buf < 1) + return AVERROR_INVALIDDATA; + + if ((value = *buf++) == RLE_TRIGGER) { + run = *buf++ + 1; + if (run != 1) + value = *buf++; + } + while (run--) { + if (x < len) + ptr[x] = value; + if (++x >= alen) { + x = 0; + ptr += stride; + if (ptr == end) + break; + } + } + } + } else { + for (y = 0; y < h; y++) { + if (buf_end - buf < len) + break; + memcpy(ptr, buf, len); + ptr += stride; + buf += alen; + } + } + if (avctx->pix_fmt == AV_PIX_FMT_PAL8 && depth < 8) { + uint8_t *ptr_free = ptr2; + ptr = p->data[0]; + for (y=0; y<h; y++) { + for (x = 0; x < (w + 7 >> 3) * depth; x++) { + if (depth == 1) { + ptr[8*x] = ptr2[x] >> 7; + ptr[8*x+1] = ptr2[x] >> 6 & 1; + ptr[8*x+2] = ptr2[x] >> 5 & 1; + ptr[8*x+3] = ptr2[x] >> 4 & 1; + ptr[8*x+4] = ptr2[x] >> 3 & 1; + ptr[8*x+5] = ptr2[x] >> 2 & 1; + ptr[8*x+6] = ptr2[x] >> 1 & 1; + ptr[8*x+7] = ptr2[x] & 1; + } else { + ptr[2*x] = ptr2[x] >> 4; + ptr[2*x+1] = ptr2[x] & 0xF; + } + } + ptr += p->linesize[0]; + ptr2 += (w + 15 >> 3) * depth; + } + av_freep(&ptr_free); + } + + *got_frame = 1; + + return buf - bufstart; +} + +AVCodec ff_sunrast_decoder = { + .name = "sunrast", + .type = AVMEDIA_TYPE_VIDEO, + .id = AV_CODEC_ID_SUNRAST, + .decode = sunrast_decode_frame, + .capabilities = CODEC_CAP_DR1, + .long_name = NULL_IF_CONFIG_SMALL("Sun Rasterfile image"), +}; |