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ffmpeg/libavcodec/gemdec.c

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/*
* GEM Raster image decoder
* Copyright (c) 2021 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
* GEM Raster image decoder
*/
#include "libavutil/mem.h"
#include "avcodec.h"
#include "bytestream.h"
#include "codec_internal.h"
#include "decode.h"
static const uint32_t gem_color_palette[16]={
0xFFFFFFFF, 0xFFFF0000, 0xFF00FF00, 0xFFFFFF00,
0xFF0000FF, 0xFFFF00FF, 0xFF00FFFF, 0xFFAEAEAE,
0xFF555555, 0xFFAE0000, 0xFF00AE00, 0xFFAEAE00,
0xFF0000AE, 0xFFAE00AE, 0xFF00AEAE, 0xFF000000,
};
static const uint8_t gem_gray[256]={
0xFF, 0x7F, 0xBF, 0x3F, 0xDF, 0x5F, 0x9F, 0x1F, 0xEF, 0x6F, 0xAF, 0x2F, 0xCF, 0x4F, 0x8F, 0x0F,
0xF7, 0x77, 0xB7, 0x37, 0xD7, 0x57, 0x97, 0x17, 0xE7, 0x67, 0xA7, 0x27, 0xC7, 0x47, 0x87, 0x07,
0xFB, 0x7B, 0xBB, 0x3B, 0xDB, 0x5B, 0x9B, 0x1B, 0xEB, 0x6B, 0xAB, 0x2B, 0xCB, 0x4B, 0x8B, 0x0B,
0xF3, 0x73, 0xB3, 0x33, 0xD3, 0x53, 0x93, 0x13, 0xE3, 0x63, 0xA3, 0x23, 0xC3, 0x43, 0x83, 0x03,
0xFD, 0x7D, 0xBD, 0x3D, 0xDD, 0x5D, 0x9D, 0x1D, 0xED, 0x6D, 0xAD, 0x2D, 0xCD, 0x4D, 0x8D, 0x0D,
0xF5, 0x75, 0xB5, 0x35, 0xD5, 0x55, 0x95, 0x15, 0xE5, 0x65, 0xA5, 0x25, 0xC5, 0x45, 0x85, 0x05,
0xF9, 0x79, 0xB9, 0x39, 0xD9, 0x59, 0x99, 0x19, 0xE9, 0x69, 0xA9, 0x29, 0xC9, 0x49, 0x89, 0x09,
0xF1, 0x71, 0xB1, 0x31, 0xD1, 0x51, 0x91, 0x11, 0xE1, 0x61, 0xA1, 0x21, 0xC1, 0x41, 0x81, 0x01,
0xFE, 0x7E, 0xBE, 0x3E, 0xDE, 0x5E, 0x9E, 0x1E, 0xEE, 0x6E, 0xAE, 0x2E, 0xCE, 0x4E, 0x8E, 0x0E,
0xF6, 0x76, 0xB6, 0x36, 0xD6, 0x56, 0x96, 0x16, 0xE6, 0x66, 0xA6, 0x26, 0xC6, 0x46, 0x86, 0x06,
0xFA, 0x7A, 0xBA, 0x3A, 0xDA, 0x5A, 0x9A, 0x1A, 0xEA, 0x6A, 0xAA, 0x2A, 0xCA, 0x4A, 0x8A, 0x0A,
0xF2, 0x72, 0xB2, 0x32, 0xD2, 0x52, 0x92, 0x12, 0xE2, 0x62, 0xA2, 0x22, 0xC2, 0x42, 0x82, 0x02,
0xFC, 0x7C, 0xBC, 0x3C, 0xDC, 0x5C, 0x9C, 0x1C, 0xEC, 0x6C, 0xAC, 0x2C, 0xCC, 0x4C, 0x8C, 0x0C,
0xF4, 0x74, 0xB4, 0x34, 0xD4, 0x54, 0x94, 0x14, 0xE4, 0x64, 0xA4, 0x24, 0xC4, 0x44, 0x84, 0x04,
0xF8, 0x78, 0xB8, 0x38, 0xD8, 0x58, 0x98, 0x18, 0xE8, 0x68, 0xA8, 0x28, 0xC8, 0x48, 0x88, 0x08,
0xF0, 0x70, 0xB0, 0x30, 0xD0, 0x50, 0x90, 0x10, 0xE0, 0x60, 0xA0, 0x20, 0xC0, 0x40, 0x80, 0x00,
};
typedef struct {
int y, pl, x, vdup;
} State;
static void put_lines_bits(AVCodecContext *avctx, int planes, int row_width, int pixel_size, State * state, uint8_t * row, AVFrame *p)
{
int pl_byte = state->pl / 8;
int pl_bit = state->pl & 7;
for (int y = 0; y < state->vdup && (state->y + y) < avctx->height; y++)
for (int x = 0; x < row_width; x++)
for (int i = 7; i >= 0 && x * 8 + 7 - i < avctx->width; i--)
p->data[0][ (state->y + y) * p->linesize[0] + (x * 8 + 7 - i) * pixel_size + pl_byte] |= !!(row[x] & (1 << i)) << pl_bit;
state->pl++;
if (state->pl >= planes) {
state->pl = 0;
state->y += state->vdup;
state->vdup = 1;
}
}
static void put_lines_bytes(AVCodecContext *avctx, int planes, int row_width, int pixel_size, State * state, uint8_t * row, AVFrame *p)
{
for (int y = 0; y < state->vdup && (state->y + y) < avctx->height; y++)
memcpy(p->data[0] + (state->y + y) * p->linesize[0], row, avctx->width * pixel_size);
state->y += state->vdup;
state->vdup = 1;
}
static int gem_decode_frame(AVCodecContext *avctx, AVFrame *p,
int *got_frame, AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
const uint8_t *buf_end = buf + buf_size;
int header_size, planes, pattern_size, tag = 0, count_scalar = 1, ret;
unsigned int x, count, v;
GetByteContext gb;
uint32_t *palette;
const uint8_t * b;
uint8_t * row;
int row_width, pixel_size;
State state = {.y = 0, .pl = 0, .x = 0, .vdup = 1};
void (*put_lines)(AVCodecContext *avctx, int planes, int row_width, int pixel_size, State * state, uint8_t * row, AVFrame *p);
int width, height;
if (buf_size <= 16)
return AVERROR_INVALIDDATA;
bytestream2_init(&gb, buf + 2, buf_size - 2);
header_size = bytestream2_get_be16(&gb);
if (header_size < 8 || buf_size <= header_size * 2)
return AVERROR_INVALIDDATA;
planes = bytestream2_get_be16(&gb);
pattern_size = bytestream2_get_be16(&gb);
avctx->sample_aspect_ratio.num = bytestream2_get_be16(&gb);
avctx->sample_aspect_ratio.den = bytestream2_get_be16(&gb);
width = bytestream2_get_be16(&gb);
height = bytestream2_get_be16(&gb);
ret = ff_set_dimensions(avctx, width, height);
if (ret < 0)
return ret;
row_width = (avctx->width + 7) / 8;
put_lines = put_lines_bits;
if (header_size == 9) {
count_scalar = bytestream2_get_be16(&gb);
if (count_scalar != 3) {
avpriv_request_sample(avctx, "count_scalar=%d", count_scalar);
return AVERROR_PATCHWELCOME;
}
planes = 24;
avctx->pix_fmt = AV_PIX_FMT_BGR24;
pixel_size = 3;
} else if (planes == 15) {
#if HAVE_BIGENDIAN
avctx->pix_fmt = AV_PIX_FMT_BGR555BE;
#else
avctx->pix_fmt = AV_PIX_FMT_BGR555LE;
#endif
pixel_size = 2;
} else if (planes == 16) {
avctx->pix_fmt = AV_PIX_FMT_RGB565BE;
pixel_size = 2;
} else if (planes == 24) {
avctx->pix_fmt = AV_PIX_FMT_RGB24;
pixel_size = 3;
} else if (planes == 32) {
avctx->pix_fmt = AV_PIX_FMT_0RGB;
pixel_size = 4;
} else {
avctx->pix_fmt = AV_PIX_FMT_PAL8;
pixel_size = 1;
}
if (header_size >= 11)
tag = bytestream2_peek_be32(&gb);
if (tag == AV_RB32("STTT")) {
if (planes != 4) {
avpriv_request_sample(avctx, "STTT planes=%d", planes);
return AVERROR_PATCHWELCOME;
}
} else if (tag == AV_RB32("TIMG")) {
if (planes != 15) {
avpriv_request_sample(avctx, "TIMG planes=%d", planes);
return AVERROR_PATCHWELCOME;
}
} else if (tag == AV_RB32("XIMG")) {
if (planes != 1 && planes != 2 && planes != 4 && planes != 8 && planes != 16 && planes != 24 && planes != 32) {
avpriv_request_sample(avctx, "XIMG planes=%d", planes);
return AVERROR_PATCHWELCOME;
}
} else if (planes != 1 && planes != 2 && planes != 3 && planes != 4 && planes != 8 && planes != 16 && planes != 24) {
avpriv_request_sample(avctx, "planes=%d", planes);
return AVERROR_PATCHWELCOME;
}
if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
return ret;
p->pict_type = AV_PICTURE_TYPE_I;
p->flags |= AV_FRAME_FLAG_KEY;
#if FF_API_PALETTE_HAS_CHANGED
FF_DISABLE_DEPRECATION_WARNINGS
p->palette_has_changed = 1;
FF_ENABLE_DEPRECATION_WARNINGS
#endif
palette = (uint32_t *)p->data[1];
if (tag == AV_RB32("STTT")) {
bytestream2_skip(&gb, 6);
if (planes == 4) {
for (int i = 0; i < (1 << planes); i++) {
int v = bytestream2_get_be16(&gb);
int r = ((v >> 8) & 0x7) << 5;
int g = ((v >> 4) & 0x7) << 5;
int b = ((v ) & 0x7) << 5;
palette[i] = 0xFF000000 | r << 16 | g << 8 | b;
}
} else {
av_assert0(0);
}
} else if (tag == AV_RB32("TIMG")) {
bytestream2_skip(&gb, 4);
if (planes != 15) {
av_assert0(0);
}
} else if (tag == AV_RB32("XIMG")) {
bytestream2_skip(&gb, 6);
if (planes == 1 || planes == 2 || planes == 4 || planes == 8) {
for (int i = 0; i < (1 << planes); i++) {
int r = (bytestream2_get_be16(&gb) * 51 + 100) / 200;
int g = (bytestream2_get_be16(&gb) * 51 + 100) / 200;
int b = (bytestream2_get_be16(&gb) * 51 + 100) / 200;
palette[i] = 0xFF000000 | r << 16 | g << 8 | b;
}
} else if (planes == 16) {
planes = 1;
row_width = ((avctx->width + 7)/8)*8 * pixel_size;
put_lines = put_lines_bytes;
} else if (planes == 24) {
planes = 1;
row_width = ((avctx->width + 15)/16)*16 * pixel_size;
put_lines = put_lines_bytes;
} else if (planes == 32) {
planes = 1;
row_width = avctx->width * pixel_size;
put_lines = put_lines_bytes;
} else {
av_assert0(0);
}
} else if (planes == 1) {
palette[0] = 0xFFFFFFFF;
palette[1] = 0xFF000000;
} else if (planes == 2 || planes == 3 || planes == 4) {
if (header_size == 9 + (1 << planes)) {
bytestream2_skip(&gb, 2);
for (int i = 0; i < (1 << planes); i++) {
int v = bytestream2_get_be16(&gb);
int r = ((v >> 8) & 0x7) << 5;
int g = ((v >> 4) & 0x7) << 5;
int b = ((v ) & 0x7) << 5;
palette[i] = 0xFF000000 | r << 16 | g << 8 | b;
}
} else
memcpy(palette, gem_color_palette, sizeof(gem_color_palette));
} else if (planes == 8) {
for (int i = 0; i < 256; i++)
palette[i] = 0xFF000000 | (gem_gray[i]<<16) | (gem_gray[i]<<8) | gem_gray[i];
} else if (planes == 16) {
planes = 1;
row_width = avctx->width * pixel_size;
put_lines = put_lines_bytes;
} else if (planes == 24) {
planes = 1;
row_width = avctx->width * pixel_size;
put_lines = put_lines_bytes;
} else
av_assert0(0);
ret = av_reallocp_array(&avctx->priv_data, planes, row_width);
if (ret < 0)
return ret;
row = avctx->priv_data;
memset(p->data[0], 0, avctx->height * p->linesize[0]);
b = buf + header_size * 2;
x = 0;
#define SKIP \
do { \
x++; \
if (x >= row_width) { \
put_lines(avctx, planes, row_width, pixel_size, &state, row + state.pl * row_width, p); \
if (state.y >= avctx->height) goto abort; \
x = 0; \
} \
} while(0)
#define PUT(v) \
do { \
row[state.pl * row_width + x++] = v; \
if (x >= row_width) { \
put_lines(avctx, planes, row_width, pixel_size, &state, row + state.pl * row_width, p); \
if (state.y >= avctx->height) goto abort; \
x = 0; \
} \
} while(0)
while(b < buf_end) {
int opcode = *b++;
if (opcode == 0x80) { /* copy */
if (b >= buf_end)
goto abort;
count = *b++;
if (!count)
count = 256;
count *= count_scalar;
for (int j = 0; j < count; j++) {
if (b >= buf_end)
goto abort;
PUT(*b++);
}
} else if (opcode) { /* run */
count = opcode & 0x7f;
if (!count)
count = 256;
count *= count_scalar;
v = opcode & 0x80 ? 0xFF : 0x00;
for (int i = 0; i < count; i++)
PUT(v);
} else {
if (b >= buf_end)
goto abort;
count = *b++;
if (count) { /* pattern */
if (b > buf_end - pattern_size)
goto abort;
count *= count_scalar;
for (int j = 0; j < count; j++)
for (int k = 0; k < pattern_size; k++)
PUT(b[k]);
b += pattern_size;
} else {
if (b >= buf_end)
goto abort;
count = *b++;
if (count == 0xFF) { /* vertical duplication */
if (b >= buf_end)
goto abort;
state.vdup = *b++;
if (!state.vdup)
state.vdup = 256;
} else { /* horizontal duplication */
for (int i = 0; i < count + 1; i++)
SKIP;
}
}
}
}
abort:
*got_frame = 1;
return buf_size;
}
static av_cold int gem_close(AVCodecContext *avctx)
{
av_freep(&avctx->priv_data);
return 0;
}
const FFCodec ff_gem_decoder = {
.p.name = "gem",
CODEC_LONG_NAME("GEM Raster image"),
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_GEM,
.p.capabilities = AV_CODEC_CAP_DR1,
FF_CODEC_DECODE_CB(gem_decode_frame),
.close = gem_close,
};
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