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/*
* 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
*/
|
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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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const uint8_t *buf = avpkt->data;
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)
return AVERROR_INVALIDDATA;
|
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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);
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); |
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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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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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if (maptype == RMT_RAW) { |
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avpriv_request_sample(avctx, "Unknown colormap type"); |
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return AVERROR_PATCHWELCOME;
}
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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if (type == RT_FORMAT_TIFF || type == RT_FORMAT_IFF) {
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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switch (depth) {
case 1: |
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avctx->pix_fmt = maplength ? AV_PIX_FMT_PAL8 : AV_PIX_FMT_MONOWHITE; |
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break;
case 4: |
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avctx->pix_fmt = maplength ? AV_PIX_FMT_PAL8 : AV_PIX_FMT_NONE; |
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break;
case 8: |
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avctx->pix_fmt = maplength ? AV_PIX_FMT_PAL8 : AV_PIX_FMT_GRAY8; |
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break;
case 24: |
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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:
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);
if (ret < 0)
return ret;
|
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/* scanlines are aligned on 16 bit boundaries */
len = (depth * w + 7) >> 3;
alen = len + (len & 1);
if (buf_end - buf < maplength + (len * h) * 3 / 256) |
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return AVERROR_INVALIDDATA;
|
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if ((ret = ff_get_buffer(avctx, p, 0)) < 0) |
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return ret; |
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|
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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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} else if (maplength) { |
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unsigned int len = maplength / 3;
if (maplength % 3 || maplength > 768) {
av_log(avctx, AV_LOG_WARNING, "invalid colormap length\n"); |
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return AVERROR_INVALIDDATA; |
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}
ptr = p->data[1]; |
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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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}
buf += maplength;
|
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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)
return AVERROR(ENOMEM);
stride = (w + 15 >> 3) * depth;
} else { |
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ptr = p->data[0];
stride = p->linesize[0]; |
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} |
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if (type == RT_BYTE_ENCODED) {
int value, run; |
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uint8_t *end = ptr + h * stride; |
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x = 0; |
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while (ptr != end && buf < buf_end) { |
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run = 1; |
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if (buf_end - buf < 1)
return AVERROR_INVALIDDATA;
|
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if ((value = *buf++) == RLE_TRIGGER) { |
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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 { |
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for (y = 0; y < h; y++) { |
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if (buf_end - buf < alen) |
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break; |
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memcpy(ptr, buf, len);
ptr += stride;
buf += alen;
}
} |
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if (avctx->pix_fmt == AV_PIX_FMT_PAL8 && depth < 8) { |
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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);
} |
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|
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*got_frame = 1; |
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return buf - bufstart;
}
|
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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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}; |