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FFmpeg/libavcodec/sunrast.c
Andreas Rheinhardt 4243da4ff4 avcodec/codec_internal: Use union for FFCodec decode/encode callbacks
This is possible, because every given FFCodec has to implement
exactly one of these. Doing so decreases sizeof(FFCodec) and
therefore decreases the size of the binary.
Notice that in case of position-independent code the decrease
is in .data.rel.ro, so that this translates to decreased
memory consumption.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2022-04-05 20:02:37 +02:00

216 lines
6.7 KiB
C

/*
* 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 "codec_internal.h"
#include "internal.h"
#include "sunrast.h"
static int sunrast_decode_frame(AVCodecContext *avctx, AVFrame *p,
int *got_frame, AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
const uint8_t *buf_end = avpkt->data + avpkt->size;
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 (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 AVERROR_PATCHWELCOME;
}
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;
}
ret = ff_set_dimensions(avctx, w, h);
if (ret < 0)
return ret;
/* 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)
return AVERROR_INVALIDDATA;
if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
return ret;
p->pict_type = AV_PICTURE_TYPE_I;
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_array((w + 15), h);
if (!ptr)
return AVERROR(ENOMEM);
stride = (w + 15 >> 3) * depth;
} else {
ptr = p->data[0];
stride = p->linesize[0];
}
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 < alen)
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;
}
const FFCodec ff_sunrast_decoder = {
.p.name = "sunrast",
.p.long_name = NULL_IF_CONFIG_SMALL("Sun Rasterfile image"),
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_SUNRAST,
.p.capabilities = AV_CODEC_CAP_DR1,
FF_CODEC_DECODE_CB(sunrast_decode_frame),
};