1b7ff90107
in , else (1) { if (!1) } the if conditional will never evaluate to be true.
So as making the check useless.
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
268 lines
8.2 KiB
C
268 lines
8.2 KiB
C
/*
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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/intreadwrite.h"
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#include "libavutil/imgutils.h"
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#include "avcodec.h"
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#define RAS_MAGIC 0x59a66a95
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/* The Old and Standard format types indicate that the image data is
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* uncompressed. There is no difference between the two formats. */
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#define RT_OLD 0
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#define RT_STANDARD 1
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/* The Byte-Encoded format type indicates that the image data is compressed
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* using a run-length encoding scheme. */
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#define RT_BYTE_ENCODED 2
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/* The RGB format type indicates that the image is uncompressed with reverse
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* component order from Old and Standard (RGB vs BGR). */
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#define RT_FORMAT_RGB 3
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/* The TIFF and IFF format types indicate that the raster file was originally
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* converted from either of these file formats. We do not have any samples or
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* documentation of the format details. */
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#define RT_FORMAT_TIFF 4
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#define RT_FORMAT_IFF 5
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/* The Experimental format type is implementation-specific and is generally an
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* indication that the image file does not conform to the Sun Raster file
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* format specification. */
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#define RT_EXPERIMENTAL 0xffff
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typedef struct SUNRASTContext {
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AVFrame picture;
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} SUNRASTContext;
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static av_cold int sunrast_init(AVCodecContext *avctx) {
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SUNRASTContext *s = avctx->priv_data;
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avcodec_get_frame_defaults(&s->picture);
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avctx->coded_frame = &s->picture;
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return 0;
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}
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static int sunrast_decode_frame(AVCodecContext *avctx, void *data,
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int *data_size, AVPacket *avpkt) {
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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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SUNRASTContext * const s = avctx->priv_data;
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AVFrame *picture = data;
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AVFrame * const p = &s->picture;
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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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if (avpkt->size < 32)
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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 -1;
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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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if (type == RT_EXPERIMENTAL) {
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av_log_ask_for_sample(avctx, "unsupported (compression) type\n");
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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 -1;
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}
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if (av_image_check_size(w, h, 0, avctx)) {
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av_log(avctx, AV_LOG_ERROR, "invalid image size\n");
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return -1;
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}
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if (maptype & ~1) {
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av_log(avctx, AV_LOG_ERROR, "invalid colormap type\n");
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return -1;
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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 -1;
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}
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switch (depth) {
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case 1:
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avctx->pix_fmt = maplength ? PIX_FMT_PAL8 : PIX_FMT_MONOWHITE;
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break;
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case 4:
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avctx->pix_fmt = maplength ? PIX_FMT_PAL8 : PIX_FMT_NONE;
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break;
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case 8:
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avctx->pix_fmt = maplength ? PIX_FMT_PAL8 : PIX_FMT_GRAY8;
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break;
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case 24:
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avctx->pix_fmt = (type == RT_FORMAT_RGB) ? PIX_FMT_RGB24 : 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) ? PIX_FMT_RGB0 : PIX_FMT_BGR0;
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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 -1;
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}
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if (p->data[0])
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avctx->release_buffer(avctx, p);
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if (w != avctx->width || h != avctx->height)
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avcodec_set_dimensions(avctx, w, h);
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if (avctx->get_buffer(avctx, p) < 0) {
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av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
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return -1;
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}
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p->pict_type = AV_PICTURE_TYPE_I;
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if (buf_end - buf < maplength)
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return AVERROR_INVALIDDATA;
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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;
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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 -1;
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}
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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 = (0xFF<<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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if (maplength && depth < 8) {
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ptr = ptr2 = av_malloc((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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/* 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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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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while (ptr != end && buf < buf_end) {
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run = 1;
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if (buf_end - buf < 1)
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return AVERROR_INVALIDDATA;
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if ((value = *buf++) == 0x80) {
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run = *buf++ + 1;
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if (run != 1)
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value = *buf++;
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}
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while (run--) {
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if (x < len)
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ptr[x] = value;
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if (++x >= alen) {
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x = 0;
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ptr += stride;
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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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for (y = 0; y < h; y++) {
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if (buf_end - buf < len)
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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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if (avctx->pix_fmt == 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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*picture = s->picture;
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*data_size = sizeof(AVFrame);
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return buf - bufstart;
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}
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static av_cold int sunrast_end(AVCodecContext *avctx) {
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SUNRASTContext *s = avctx->priv_data;
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if(s->picture.data[0])
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avctx->release_buffer(avctx, &s->picture);
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return 0;
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}
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AVCodec ff_sunrast_decoder = {
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.name = "sunrast",
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.type = AVMEDIA_TYPE_VIDEO,
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.id = CODEC_ID_SUNRAST,
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.priv_data_size = sizeof(SUNRASTContext),
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.init = sunrast_init,
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.close = sunrast_end,
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.decode = sunrast_decode_frame,
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.capabilities = CODEC_CAP_DR1,
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.long_name = NULL_IF_CONFIG_SMALL("Sun Rasterfile image"),
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};
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