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/* |
* Targa (.tga) image decoder |
* Copyright (c) 2006 Konstantin Shishkov |
* |
* 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 "bytestream.h" |
#include "internal.h" |
#include "targa.h" |
|
typedef struct TargaContext { |
GetByteContext gb; |
} 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 *start, int w, int h, int stride, |
int bpp, int interleave) |
{ |
int x, y; |
int depth = (bpp + 1) >> 3; |
int type, count; |
uint8_t *line = start; |
uint8_t *dst = line; |
|
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"); |
return AVERROR_INVALIDDATA; |
} |
type = bytestream2_get_byteu(&s->gb); |
count = (type & 0x7F) + 1; |
type &= 0x80; |
if (!type) { |
do { |
int n = FFMIN(count, w - x); |
bytestream2_get_buffer(&s->gb, dst, n * depth); |
count -= n; |
dst += n * depth; |
x += n; |
if (x == w) { |
x = 0; |
dst = line = advance_line(start, line, stride, &y, h, interleave); |
} |
} while (dst && count > 0); |
} else { |
uint8_t tmp[4]; |
bytestream2_get_buffer(&s->gb, tmp, depth); |
do { |
int n = FFMIN(count, w - x); |
count -= n; |
x += n; |
do { |
memcpy(dst, tmp, depth); |
dst += depth; |
} while (--n); |
if (x == w) { |
x = 0; |
dst = line = advance_line(start, line, stride, &y, h, interleave); |
} |
} while (dst && count > 0); |
} |
} |
|
if (count) { |
av_log(avctx, AV_LOG_ERROR, "Packet went out of bounds\n"); |
return AVERROR_INVALIDDATA; |
} |
|
return 0; |
} |
|
static int decode_frame(AVCodecContext *avctx, |
void *data, int *got_frame, |
AVPacket *avpkt) |
{ |
TargaContext * const s = avctx->priv_data; |
AVFrame * const p = data; |
uint8_t *dst; |
int stride; |
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); |
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); |
csize = bytestream2_get_byte(&s->gb); |
bytestream2_skip(&s->gb, 4); /* 2: x, 2: y */ |
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) { |
case 8: |
avctx->pix_fmt = ((compr & (~TGA_RLE)) == TGA_BW) ? AV_PIX_FMT_GRAY8 : AV_PIX_FMT_PAL8; |
break; |
case 15: |
case 16: |
avctx->pix_fmt = AV_PIX_FMT_RGB555LE; |
break; |
case 24: |
avctx->pix_fmt = AV_PIX_FMT_BGR24; |
break; |
case 32: |
avctx->pix_fmt = AV_PIX_FMT_BGRA; |
break; |
default: |
av_log(avctx, AV_LOG_ERROR, "Bit depth %i is not supported\n", bpp); |
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 = av_image_check_size(w, h, 0, avctx)) < 0) |
return ret; |
if (w != avctx->width || h != avctx->height) |
avcodec_set_dimensions(avctx, w, h); |
if ((ret = ff_get_buffer(avctx, p, 0)) < 0) |
return ret; |
p->pict_type = AV_PICTURE_TYPE_I; |
|
if (flags & TGA_TOPTOBOTTOM) { |
dst = p->data[0]; |
stride = p->linesize[0]; |
} else { //image is upside-down |
dst = p->data[0] + p->linesize[0] * (h - 1); |
stride = -p->linesize[0]; |
} |
|
interleave = flags & TGA_INTERLEAVE2 ? 2 : |
flags & TGA_INTERLEAVE4 ? 4 : 1; |
|
if (colors) { |
int pal_size, pal_sample_size; |
|
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; |
default: |
av_log(avctx, AV_LOG_ERROR, "Palette entry size %i bits is not supported\n", csize); |
return AVERROR_INVALIDDATA; |
} |
pal_size = colors * pal_sample_size; |
if (avctx->pix_fmt != AV_PIX_FMT_PAL8) //should not occur but skip palette anyway |
bytestream2_skip(&s->gb, pal_size); |
else { |
int t; |
uint32_t *pal = ((uint32_t *)p->data[1]) + first_clr; |
|
if (bytestream2_get_bytes_left(&s->gb) < pal_size) { |
av_log(avctx, AV_LOG_ERROR, |
"Not enough data to read palette\n"); |
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++ = (0xffU<<24) | bytestream2_get_le24u(&s->gb); |
break; |
case 2: |
/* RGB555 */ |
for (t = 0; t < colors; t++) { |
uint32_t v = bytestream2_get_le16u(&s->gb); |
v = ((v & 0x7C00) << 9) | |
((v & 0x03E0) << 6) | |
((v & 0x001F) << 3); |
/* left bit replication */ |
v |= (v & 0xE0E0E0U) >> 5; |
*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, 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; |
} |
|
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]); |
} |
} |
} |
} |
|
*got_frame = 1; |
|
return avpkt->size; |
} |
|
AVCodec ff_targa_decoder = { |
.name = "targa", |
.long_name = NULL_IF_CONFIG_SMALL("Truevision Targa image"), |
.type = AVMEDIA_TYPE_VIDEO, |
.id = AV_CODEC_ID_TARGA, |
.priv_data_size = sizeof(TargaContext), |
.decode = decode_frame, |
.capabilities = CODEC_CAP_DR1, |
}; |