mirror of https://git.ffmpeg.org/ffmpeg.git
252 lines
7.5 KiB
C
252 lines
7.5 KiB
C
/*
|
|
* Pictor/PC Paint decoder
|
|
* Copyright (c) 2010 Peter Ross <pross@xvid.org>
|
|
*
|
|
* 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
|
|
*/
|
|
|
|
/**
|
|
* @file
|
|
* Pictor/PC Paint decoder
|
|
*/
|
|
|
|
#include "libavcore/imgutils.h"
|
|
#include "avcodec.h"
|
|
#include "bytestream.h"
|
|
#include "cga_data.h"
|
|
|
|
typedef struct PicContext {
|
|
AVFrame frame;
|
|
int width, height;
|
|
int nb_planes;
|
|
} PicContext;
|
|
|
|
static void picmemset_8bpp(PicContext *s, int value, int run, int *x, int *y)
|
|
{
|
|
while (run > 0) {
|
|
uint8_t *d = s->frame.data[0] + *y * s->frame.linesize[0];
|
|
if (*x + run >= s->width) {
|
|
int n = s->width - *x;
|
|
memset(d + *x, value, n);
|
|
run -= n;
|
|
*x = 0;
|
|
*y -= 1;
|
|
if (*y < 0)
|
|
break;
|
|
} else {
|
|
memset(d + *x, value, run);
|
|
*x += run;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void picmemset(PicContext *s, int value, int run, int *x, int *y, int *plane, int bits_per_plane)
|
|
{
|
|
uint8_t *d;
|
|
int shift = *plane * bits_per_plane;
|
|
int mask = ((1 << bits_per_plane) - 1) << shift;
|
|
value <<= shift;
|
|
|
|
while (run > 0) {
|
|
int j;
|
|
for (j = 8-bits_per_plane; j >= 0; j -= bits_per_plane) {
|
|
d = s->frame.data[0] + *y * s->frame.linesize[0];
|
|
d[*x] |= (value >> j) & mask;
|
|
*x += 1;
|
|
if (*x == s->width) {
|
|
*y -= 1;
|
|
*x = 0;
|
|
if (*y < 0) {
|
|
*y = s->height - 1;
|
|
*plane += 1;
|
|
value <<= bits_per_plane;
|
|
mask <<= bits_per_plane;
|
|
if (*plane >= s->nb_planes)
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
run--;
|
|
}
|
|
}
|
|
|
|
static const uint8_t cga_mode45_index[6][4] = {
|
|
[0] = { 0, 3, 5, 7 }, // mode4, palette#1, low intensity
|
|
[1] = { 0, 2, 4, 6 }, // mode4, palette#2, low intensity
|
|
[2] = { 0, 3, 4, 7 }, // mode5, low intensity
|
|
[3] = { 0, 11, 13, 15 }, // mode4, palette#1, high intensity
|
|
[4] = { 0, 10, 12, 14 }, // mode4, palette#2, high intensity
|
|
[5] = { 0, 11, 12, 15 }, // mode5, high intensity
|
|
};
|
|
|
|
static int decode_frame(AVCodecContext *avctx,
|
|
void *data, int *data_size,
|
|
AVPacket *avpkt)
|
|
{
|
|
PicContext *s = avctx->priv_data;
|
|
int buf_size = avpkt->size;
|
|
const uint8_t *buf = avpkt->data;
|
|
const uint8_t *buf_end = avpkt->data + buf_size;
|
|
uint32_t *palette;
|
|
int bits_per_plane, bpp, etype, esize, npal;
|
|
int i, x, y, plane;
|
|
|
|
if (buf_size < 11)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
if (bytestream_get_le16(&buf) != 0x1234)
|
|
return AVERROR_INVALIDDATA;
|
|
s->width = bytestream_get_le16(&buf);
|
|
s->height = bytestream_get_le16(&buf);
|
|
buf += 4;
|
|
bits_per_plane = *buf & 0xF;
|
|
s->nb_planes = (*buf++ >> 4) + 1;
|
|
bpp = s->nb_planes ? bits_per_plane*s->nb_planes : bits_per_plane;
|
|
if (bits_per_plane > 8 || bpp < 1 || bpp > 32) {
|
|
av_log_ask_for_sample(s, "unsupported bit depth\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
if (*buf == 0xFF) {
|
|
buf += 2;
|
|
etype = bytestream_get_le16(&buf);
|
|
esize = bytestream_get_le16(&buf);
|
|
if (buf_end - buf < esize)
|
|
return AVERROR_INVALIDDATA;
|
|
} else {
|
|
etype = -1;
|
|
esize = 0;
|
|
}
|
|
|
|
avctx->pix_fmt = PIX_FMT_PAL8;
|
|
|
|
if (s->width != avctx->width && s->height != avctx->height) {
|
|
if (av_check_image_size(s->width, s->height, 0, avctx) < 0)
|
|
return -1;
|
|
avcodec_set_dimensions(avctx, s->width, s->height);
|
|
if (s->frame.data[0])
|
|
avctx->release_buffer(avctx, &s->frame);
|
|
}
|
|
|
|
if (avctx->get_buffer(avctx, &s->frame) < 0){
|
|
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
|
|
return -1;
|
|
}
|
|
memset(s->frame.data[0], 0, s->height * s->frame.linesize[0]);
|
|
s->frame.pict_type = FF_I_TYPE;
|
|
s->frame.palette_has_changed = 1;
|
|
|
|
palette = (uint32_t*)s->frame.data[1];
|
|
if (etype == 1 && esize > 1 && *buf < 6) {
|
|
int idx = *buf;
|
|
npal = 4;
|
|
for (i = 0; i < npal; i++)
|
|
palette[i] = ff_cga_palette[ cga_mode45_index[idx][i] ];
|
|
} else if (etype == 2) {
|
|
npal = FFMIN(esize, 16);
|
|
for (i = 0; i < npal; i++)
|
|
palette[i] = ff_cga_palette[ FFMIN(buf[i], 16)];
|
|
} else if (etype == 3) {
|
|
npal = FFMIN(esize, 16);
|
|
for (i = 0; i < npal; i++)
|
|
palette[i] = ff_ega_palette[ FFMIN(buf[i], 63)];
|
|
} else if (etype == 4 || etype == 5) {
|
|
npal = FFMIN(esize / 3, 256);
|
|
for (i = 0; i < npal; i++)
|
|
palette[i] = AV_RB24(buf + i*3) << 2;
|
|
} else {
|
|
if (bpp == 1) {
|
|
npal = 2;
|
|
palette[0] = 0x000000;
|
|
palette[1] = 0xFFFFFF;
|
|
} else if (bpp == 2) {
|
|
npal = 4;
|
|
for (i = 0; i < npal; i++)
|
|
palette[i] = ff_cga_palette[ cga_mode45_index[0][i] ];
|
|
} else {
|
|
npal = 16;
|
|
memcpy(palette, ff_cga_palette, npal * 4);
|
|
}
|
|
}
|
|
// fill remaining palette entries
|
|
memset(palette + npal, 0, AVPALETTE_SIZE - npal * 4);
|
|
buf += esize;
|
|
|
|
|
|
x = 0;
|
|
y = s->height - 1;
|
|
plane = 0;
|
|
if (bytestream_get_le16(&buf)) {
|
|
while (buf_end - buf >= 6) {
|
|
const uint8_t *buf_pend = buf + FFMIN(AV_RL16(buf), buf_end - buf);
|
|
//ignore uncompressed block size reported at buf[2]
|
|
int marker = buf[4];
|
|
buf += 5;
|
|
|
|
while (plane < s->nb_planes && buf_pend - buf >= 1) {
|
|
int run = 1;
|
|
int val = *buf++;
|
|
if (val == marker) {
|
|
run = *buf++;
|
|
if (run == 0)
|
|
run = bytestream_get_le16(&buf);
|
|
val = *buf++;
|
|
}
|
|
if (buf > buf_end)
|
|
break;
|
|
|
|
if (bits_per_plane == 8) {
|
|
picmemset_8bpp(s, val, run, &x, &y);
|
|
if (y < 0)
|
|
break;
|
|
} else {
|
|
picmemset(s, val, run, &x, &y, &plane, bits_per_plane);
|
|
}
|
|
}
|
|
}
|
|
} else {
|
|
av_log_ask_for_sample(s, "uncompressed image\n");
|
|
return buf_size;
|
|
}
|
|
|
|
*data_size = sizeof(AVFrame);
|
|
*(AVFrame*)data = s->frame;
|
|
return buf_size;
|
|
}
|
|
|
|
static av_cold int decode_end(AVCodecContext *avctx)
|
|
{
|
|
PicContext *s = avctx->priv_data;
|
|
if (s->frame.data[0])
|
|
avctx->release_buffer(avctx, &s->frame);
|
|
return 0;
|
|
}
|
|
|
|
AVCodec pictor_decoder = {
|
|
"pictor",
|
|
CODEC_TYPE_VIDEO,
|
|
CODEC_ID_PICTOR,
|
|
sizeof(PicContext),
|
|
NULL,
|
|
NULL,
|
|
decode_end,
|
|
decode_frame,
|
|
CODEC_CAP_DR1,
|
|
.long_name = NULL_IF_CONFIG_SMALL("Pictor/PC Paint"),
|
|
};
|