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ffmpeg/libavcodec/sunrast.c

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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
*/
#include "libavutil/intreadwrite.h"
#include "libavutil/imgutils.h"
#include "avcodec.h"
#include "sunrast.h"
typedef struct SUNRASTContext {
AVFrame picture;
} SUNRASTContext;
static av_cold int sunrast_init(AVCodecContext *avctx) {
SUNRASTContext *s = avctx->priv_data;
avcodec_get_frame_defaults(&s->picture);
avctx->coded_frame = &s->picture;
return 0;
}
static int sunrast_decode_frame(AVCodecContext *avctx, void *data,
int *data_size, AVPacket *avpkt) {
const uint8_t *buf = avpkt->data;
const uint8_t *buf_end = avpkt->data + avpkt->size;
SUNRASTContext * const s = avctx->priv_data;
AVFrame *picture = data;
AVFrame * const p = &s->picture;
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) {
av_log_ask_for_sample(avctx, "unsupported (compression) type\n");
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) {
av_log_ask_for_sample(avctx, "unsupported colormap type\n");
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 ? PIX_FMT_PAL8 : PIX_FMT_MONOWHITE;
break;
case 4:
avctx->pix_fmt = maplength ? PIX_FMT_PAL8 : PIX_FMT_NONE;
break;
case 8:
avctx->pix_fmt = maplength ? PIX_FMT_PAL8 : PIX_FMT_GRAY8;
break;
case 24:
avctx->pix_fmt = (type == RT_FORMAT_RGB) ? PIX_FMT_RGB24 : PIX_FMT_BGR24;
break;
case 32:
avctx->pix_fmt = (type == RT_FORMAT_RGB) ? PIX_FMT_0RGB : PIX_FMT_0BGR;
break;
default:
av_log(avctx, AV_LOG_ERROR, "invalid depth\n");
return AVERROR_INVALIDDATA;
}
if (p->data[0])
avctx->release_buffer(avctx, p);
if (w != avctx->width || h != avctx->height)
avcodec_set_dimensions(avctx, w, h);
if ((ret = avctx->get_buffer(avctx, p)) < 0) {
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
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 = (0xFF<<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 == 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);
}
*picture = s->picture;
*data_size = sizeof(AVFrame);
return buf - bufstart;
}
static av_cold int sunrast_end(AVCodecContext *avctx) {
SUNRASTContext *s = avctx->priv_data;
if(s->picture.data[0])
avctx->release_buffer(avctx, &s->picture);
return 0;
}
AVCodec ff_sunrast_decoder = {
.name = "sunrast",
.type = AVMEDIA_TYPE_VIDEO,
.id = CODEC_ID_SUNRAST,
.priv_data_size = sizeof(SUNRASTContext),
.init = sunrast_init,
.close = sunrast_end,
.decode = sunrast_decode_frame,
.capabilities = CODEC_CAP_DR1,
.long_name = NULL_IF_CONFIG_SMALL("Sun Rasterfile image"),
};
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