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ffmpeg/libavcodec/pictordec.c

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/*
* 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 "libavutil/imgutils.h"
#include "avcodec.h"
#include "bytestream.h"
#include "cga_data.h"
#include "internal.h"
typedef struct PicContext {
int width, height;
int nb_planes;
GetByteContext g;
} PicContext;
static void picmemset_8bpp(PicContext *s, AVFrame *frame, int value, int run,
int *x, int *y)
{
while (run > 0) {
uint8_t *d = frame->data[0] + *y * 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, AVFrame *frame, unsigned value, int run,
int *x, int *y, int *plane, int bits_per_plane)
{
uint8_t *d;
int shift = *plane * bits_per_plane;
unsigned mask = ((1U << bits_per_plane) - 1) << shift;
int xl = *x;
int yl = *y;
int planel = *plane;
value <<= shift;
d = frame->data[0] + yl * frame->linesize[0];
while (run > 0) {
int j;
for (j = 8-bits_per_plane; j >= 0; j -= bits_per_plane) {
d[xl] |= (value >> j) & mask;
xl += 1;
if (xl == s->width) {
yl -= 1;
xl = 0;
if (yl < 0) {
yl = s->height - 1;
planel += 1;
if (planel >= s->nb_planes)
goto end;
value <<= bits_per_plane;
mask <<= bits_per_plane;
}
d = frame->data[0] + yl * frame->linesize[0];
}
}
run--;
}
end:
*x = xl;
*y = yl;
*plane = planel;
}
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 *got_frame,
AVPacket *avpkt)
{
PicContext *s = avctx->priv_data;
AVFrame *frame = data;
uint32_t *palette;
int bits_per_plane, bpp, etype, esize, npal, pos_after_pal;
int i, x, y, plane, tmp, ret, val;
bytestream2_init(&s->g, avpkt->data, avpkt->size);
if (bytestream2_get_bytes_left(&s->g) < 11)
return AVERROR_INVALIDDATA;
if (bytestream2_get_le16u(&s->g) != 0x1234)
return AVERROR_INVALIDDATA;
s->width = bytestream2_get_le16u(&s->g);
s->height = bytestream2_get_le16u(&s->g);
bytestream2_skip(&s->g, 4);
tmp = bytestream2_get_byteu(&s->g);
bits_per_plane = tmp & 0xF;
s->nb_planes = (tmp >> 4) + 1;
bpp = bits_per_plane * s->nb_planes;
if (bits_per_plane > 8 || bpp < 1 || bpp > 32) {
avpriv_request_sample(avctx, "Unsupported bit depth");
return AVERROR_PATCHWELCOME;
}
if (bytestream2_peek_byte(&s->g) == 0xFF || bpp == 1 || bpp == 4 || bpp == 8) {
bytestream2_skip(&s->g, 2);
etype = bytestream2_get_le16(&s->g);
esize = bytestream2_get_le16(&s->g);
if (bytestream2_get_bytes_left(&s->g) < esize)
return AVERROR_INVALIDDATA;
} else {
etype = -1;
esize = 0;
}
avctx->pix_fmt = AV_PIX_FMT_PAL8;
if (av_image_check_size(s->width, s->height, 0, avctx) < 0)
return -1;
if (s->width != avctx->width || s->height != avctx->height) {
ret = ff_set_dimensions(avctx, s->width, s->height);
if (ret < 0)
return ret;
}
if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
return ret;
memset(frame->data[0], 0, s->height * frame->linesize[0]);
frame->pict_type = AV_PICTURE_TYPE_I;
frame->palette_has_changed = 1;
pos_after_pal = bytestream2_tell(&s->g) + esize;
palette = (uint32_t*)frame->data[1];
if (etype == 1 && esize > 1 && bytestream2_peek_byte(&s->g) < 6) {
int idx = bytestream2_get_byte(&s->g);
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++) {
int pal_idx = bytestream2_get_byte(&s->g);
palette[i] = ff_cga_palette[FFMIN(pal_idx, 15)];
}
} else if (etype == 3) {
npal = FFMIN(esize, 16);
for (i = 0; i < npal; i++) {
int pal_idx = bytestream2_get_byte(&s->g);
palette[i] = ff_ega_palette[FFMIN(pal_idx, 63)];
}
} else if (etype == 4 || etype == 5) {
npal = FFMIN(esize / 3, 256);
for (i = 0; i < npal; i++) {
palette[i] = bytestream2_get_be24(&s->g) << 2;
palette[i] |= 0xFFU << 24 | palette[i] >> 6 & 0x30303;
}
} else {
if (bpp == 1) {
npal = 2;
palette[0] = 0xFF000000;
palette[1] = 0xFFFFFFFF;
} 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);
// skip remaining palette bytes
bytestream2_seek(&s->g, pos_after_pal, SEEK_SET);
val = 0;
y = s->height - 1;
if (bytestream2_get_le16(&s->g)) {
x = 0;
plane = 0;
while (bytestream2_get_bytes_left(&s->g) >= 6) {
int stop_size, marker, t1, t2;
t1 = bytestream2_get_bytes_left(&s->g);
t2 = bytestream2_get_le16(&s->g);
stop_size = t1 - FFMIN(t1, t2);
// ignore uncompressed block size
bytestream2_skip(&s->g, 2);
marker = bytestream2_get_byte(&s->g);
while (plane < s->nb_planes &&
bytestream2_get_bytes_left(&s->g) > stop_size) {
int run = 1;
val = bytestream2_get_byte(&s->g);
if (val == marker) {
run = bytestream2_get_byte(&s->g);
if (run == 0)
run = bytestream2_get_le16(&s->g);
val = bytestream2_get_byte(&s->g);
}
if (bits_per_plane == 8) {
picmemset_8bpp(s, frame, val, run, &x, &y);
if (y < 0)
goto finish;
} else {
picmemset(s, frame, val, run, &x, &y, &plane, bits_per_plane);
}
}
}
if (s->nb_planes - plane > 1)
return AVERROR_INVALIDDATA;
if (plane < s->nb_planes && x < avctx->width) {
int run = (y + 1) * avctx->width - x;
if (bits_per_plane == 8)
picmemset_8bpp(s, frame, val, run, &x, &y);
else
picmemset(s, frame, val, run / (8 / bits_per_plane), &x, &y, &plane, bits_per_plane);
}
} else {
while (y >= 0 && bytestream2_get_bytes_left(&s->g) > 0) {
memcpy(frame->data[0] + y * frame->linesize[0], s->g.buffer, FFMIN(avctx->width, bytestream2_get_bytes_left(&s->g)));
bytestream2_skip(&s->g, avctx->width);
y--;
}
}
finish:
*got_frame = 1;
return avpkt->size;
}
AVCodec ff_pictor_decoder = {
.name = "pictor",
.long_name = NULL_IF_CONFIG_SMALL("Pictor/PC Paint"),
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_PICTOR,
.priv_data_size = sizeof(PicContext),
.decode = decode_frame,
.capabilities = AV_CODEC_CAP_DR1,
};
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