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FFmpeg/libavcodec/gemdec.c
Andreas Rheinhardt 20f9727018 avcodec/codec_internal: Add FFCodec, hide internal part of AVCodec 
Up until now, codec.h contains both public and private parts
of AVCodec. This exposes the internals of AVCodec to users
and leads them into the temptation of actually using them
and forces us to forward-declare structures and types that
users can't use at all.

This commit changes this by adding a new structure FFCodec to
codec_internal.h that extends AVCodec, i.e. contains the public
AVCodec as first member; the private fields of AVCodec are moved
to this structure, leaving codec.h clean.

Reviewed-by: Anton Khirnov <anton@khirnov.net>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2022-03-21 01:33:09 +01:00

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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 "avcodec.h"
#include "bytestream.h"
#include "codec_internal.h"
#include "internal.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,
void *data, int *got_frame,
AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
const uint8_t *buf_end = buf + buf_size;
AVFrame *p = data;
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->key_frame = 1;
p->palette_has_changed = 1;
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",
.p.long_name = NULL_IF_CONFIG_SMALL("GEM Raster image"),
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_GEM,
.p.capabilities = AV_CODEC_CAP_DR1,
.decode = gem_decode_frame,
.close = gem_close,
};
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