* Targa (.tga) image decoder
* Copyright (c) 2006 Konstantin Shishkov
*
- * This file is part of Libav.
+ * This file is part of FFmpeg.
*
- * Libav is free software; you can redistribute it and/or
+ * 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.
*
- * Libav is distributed in the hope that it will be useful,
+ * 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 Libav; if not, write to the Free Software
+ * License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
typedef struct TargaContext {
GetByteContext gb;
-
- int color_type;
- int compression_type;
} TargaContext;
+static uint8_t *advance_line(uint8_t *start, uint8_t *line,
+ int stride, int *y, int h, int interleave)
+{
+ *y += interleave;
+
+ if (*y < h) {
+ return line + interleave * stride;
+ } else {
+ *y = (*y + 1) & (interleave - 1);
+ if (*y && *y < h) {
+ return start + *y * stride;
+ } else {
+ return NULL;
+ }
+ }
+}
+
static int targa_decode_rle(AVCodecContext *avctx, TargaContext *s,
- uint8_t *dst, int w, int h, int stride, int bpp)
+ uint8_t *start, int w, int h, int stride,
+ int bpp, int interleave)
{
int x, y;
int depth = (bpp + 1) >> 3;
int type, count;
- int diff;
+ uint8_t *line = start;
+ uint8_t *dst = line;
- diff = stride - w * depth;
- x = y = 0;
- while (y < h) {
+ x = y = count = 0;
+ while (dst) {
if (bytestream2_get_bytes_left(&s->gb) <= 0) {
av_log(avctx, AV_LOG_ERROR,
"Ran ouf of data before end-of-image\n");
type = bytestream2_get_byteu(&s->gb);
count = (type & 0x7F) + 1;
type &= 0x80;
- if (x + count > w && x + count + 1 > (h - y) * w) {
- av_log(avctx, AV_LOG_ERROR,
- "Packet went out of bounds: position (%i,%i) size %i\n",
- x, y, count);
- return AVERROR_INVALIDDATA;
- }
if (!type) {
do {
int n = FFMIN(count, w - x);
x += n;
if (x == w) {
x = 0;
- y++;
- dst += diff;
+ dst = line = advance_line(start, line, stride, &y, h, interleave);
}
- } while (count > 0);
+ } while (dst && count > 0);
} else {
uint8_t tmp[4];
bytestream2_get_buffer(&s->gb, tmp, depth);
} while (--n);
if (x == w) {
x = 0;
- y++;
- dst += diff;
+ dst = line = advance_line(start, line, stride, &y, h, interleave);
}
- } while (count > 0);
+ } while (dst && count > 0);
}
}
+
+ if (count) {
+ av_log(avctx, AV_LOG_ERROR, "Packet went out of bounds\n");
+ return AVERROR_INVALIDDATA;
+ }
+
return 0;
}
AVFrame * const p = data;
uint8_t *dst;
int stride;
- int idlen, compr, y, w, h, bpp, flags, ret;
+ int idlen, pal, compr, y, w, h, bpp, flags, ret;
int first_clr, colors, csize;
+ int interleave;
bytestream2_init(&s->gb, avpkt->data, avpkt->size);
/* parse image header */
idlen = bytestream2_get_byte(&s->gb);
- bytestream2_skip(&s->gb, 1); /* pal */
+ pal = bytestream2_get_byte(&s->gb);
compr = bytestream2_get_byte(&s->gb);
first_clr = bytestream2_get_le16(&s->gb);
colors = bytestream2_get_le16(&s->gb);
w = bytestream2_get_le16(&s->gb);
h = bytestream2_get_le16(&s->gb);
bpp = bytestream2_get_byte(&s->gb);
+
+ if (bytestream2_get_bytes_left(&s->gb) <= idlen) {
+ av_log(avctx, AV_LOG_ERROR,
+ "Not enough data to read header\n");
+ return AVERROR_INVALIDDATA;
+ }
+
flags = bytestream2_get_byte(&s->gb);
+
+ if (!pal && (first_clr || colors || csize)) {
+ av_log(avctx, AV_LOG_WARNING, "File without colormap has colormap information set.\n");
+ // specification says we should ignore those value in this case
+ first_clr = colors = csize = 0;
+ }
+
// skip identifier if any
bytestream2_skip(&s->gb, idlen);
- switch(bpp){
+ switch (bpp) {
case 8:
avctx->pix_fmt = ((compr & (~TGA_RLE)) == TGA_BW) ? AV_PIX_FMT_GRAY8 : AV_PIX_FMT_PAL8;
break;
case 15:
- avctx->pix_fmt = AV_PIX_FMT_RGB555LE;
- break;
case 16:
avctx->pix_fmt = AV_PIX_FMT_RGB555LE;
break;
return AVERROR_INVALIDDATA;
}
+ if (colors && (colors + first_clr) > 256) {
+ av_log(avctx, AV_LOG_ERROR, "Incorrect palette: %i colors with offset %i\n", colors, first_clr);
+ return AVERROR_INVALIDDATA;
+ }
+
if ((ret = ff_set_dimensions(avctx, w, h)) < 0)
return ret;
- if ((ret = ff_get_buffer(avctx, p, 0)) < 0){
- av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
+ if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
return ret;
- }
- if(flags & 0x20){
+ p->pict_type = AV_PICTURE_TYPE_I;
+
+ if (flags & TGA_TOPTOBOTTOM) {
dst = p->data[0];
stride = p->linesize[0];
- }else{ //image is upside-down
+ } else { //image is upside-down
dst = p->data[0] + p->linesize[0] * (h - 1);
stride = -p->linesize[0];
}
- if(colors){
+ interleave = flags & TGA_INTERLEAVE2 ? 2 :
+ flags & TGA_INTERLEAVE4 ? 4 : 1;
+
+ if (colors) {
int pal_size, pal_sample_size;
- if((colors + first_clr) > 256){
- av_log(avctx, AV_LOG_ERROR, "Incorrect palette: %i colors with offset %i\n", colors, first_clr);
- return AVERROR_INVALIDDATA;
- }
+
switch (csize) {
+ case 32: pal_sample_size = 4; break;
case 24: pal_sample_size = 3; break;
case 16:
case 15: pal_sample_size = 2; break;
return AVERROR_INVALIDDATA;
}
pal_size = colors * pal_sample_size;
- if(avctx->pix_fmt != AV_PIX_FMT_PAL8)//should not occur but skip palette anyway
+ if (avctx->pix_fmt != AV_PIX_FMT_PAL8) //should not occur but skip palette anyway
bytestream2_skip(&s->gb, pal_size);
- else{
+ else {
int t;
uint32_t *pal = ((uint32_t *)p->data[1]) + first_clr;
return AVERROR_INVALIDDATA;
}
switch (pal_sample_size) {
+ case 4:
+ for (t = 0; t < colors; t++)
+ *pal++ = bytestream2_get_le32u(&s->gb);
+ break;
case 3:
/* RGB24 */
for (t = 0; t < colors; t++)
- *pal++ = bytestream2_get_le24u(&s->gb);
+ *pal++ = (0xffU<<24) | bytestream2_get_le24u(&s->gb);
break;
case 2:
/* RGB555 */
((v & 0x001F) << 3);
/* left bit replication */
v |= (v & 0xE0E0E0U) >> 5;
- *pal++ = v;
+ *pal++ = (0xffU<<24) | v;
}
break;
}
p->palette_has_changed = 1;
}
}
+
if ((compr & (~TGA_RLE)) == TGA_NODATA) {
memset(p->data[0], 0, p->linesize[0] * h);
} else {
- if(compr & TGA_RLE){
- int res = targa_decode_rle(avctx, s, dst, w, h, stride, bpp);
+ if (compr & TGA_RLE) {
+ int res = targa_decode_rle(avctx, s, dst, w, h, stride, bpp, interleave);
if (res < 0)
return res;
} else {
size_t img_size = w * ((bpp + 1) >> 3);
+ uint8_t *line;
if (bytestream2_get_bytes_left(&s->gb) < img_size * h) {
av_log(avctx, AV_LOG_ERROR,
"Not enough data available for image\n");
return AVERROR_INVALIDDATA;
}
- for (y = 0; y < h; y++) {
- bytestream2_get_bufferu(&s->gb, dst, img_size);
- dst += stride;
+
+ line = dst;
+ y = 0;
+ do {
+ bytestream2_get_buffer(&s->gb, line, img_size);
+ line = advance_line(dst, line, stride, &y, h, interleave);
+ } while (line);
+ }
+ }
+
+ if (flags & TGA_RIGHTTOLEFT) { // right-to-left, needs horizontal flip
+ int x;
+ for (y = 0; y < h; y++) {
+ void *line = &p->data[0][y * p->linesize[0]];
+ for (x = 0; x < w >> 1; x++) {
+ switch (bpp) {
+ case 32:
+ FFSWAP(uint32_t, ((uint32_t *)line)[x], ((uint32_t *)line)[w - x - 1]);
+ break;
+ case 24:
+ FFSWAP(uint8_t, ((uint8_t *)line)[3 * x ], ((uint8_t *)line)[3 * w - 3 * x - 3]);
+ FFSWAP(uint8_t, ((uint8_t *)line)[3 * x + 1], ((uint8_t *)line)[3 * w - 3 * x - 2]);
+ FFSWAP(uint8_t, ((uint8_t *)line)[3 * x + 2], ((uint8_t *)line)[3 * w - 3 * x - 1]);
+ break;
+ case 16:
+ FFSWAP(uint16_t, ((uint16_t *)line)[x], ((uint16_t *)line)[w - x - 1]);
+ break;
+ case 8:
+ FFSWAP(uint8_t, ((uint8_t *)line)[x], ((uint8_t *)line)[w - x - 1]);
+ }
}
}
}
projects / ffmpeg / blobdiff