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FFmpeg/libavcodec/fic.c
Andreas Rheinhardt 930e560da3 avcodec/decoders: Use const uint8_t* to access input packet data 
These packets need not be writable, so we must not modify them.

Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2022-07-04 15:04:01 +02:00

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/*
* Mirillis FIC decoder
*
* Copyright (c) 2014 Konstantin Shishkov
* Copyright (c) 2014 Derek Buitenhuis
*
* 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/common.h"
#include "libavutil/mem_internal.h"
#include "libavutil/opt.h"
#include "avcodec.h"
#include "codec_internal.h"
#include "internal.h"
#include "get_bits.h"
#include "golomb.h"
typedef struct FICThreadContext {
DECLARE_ALIGNED(16, int16_t, block)[64];
const uint8_t *src;
int slice_h;
int src_size;
int y_off;
int p_frame;
} FICThreadContext;
typedef struct FICContext {
AVClass *class;
AVCodecContext *avctx;
AVFrame *frame;
AVFrame *final_frame;
FICThreadContext *slice_data;
int slice_data_size;
const uint8_t *qmat;
enum AVPictureType cur_frame_type;
int aligned_width, aligned_height;
int num_slices, slice_h;
uint8_t cursor_buf[4096];
int skip_cursor;
} FICContext;
static const uint8_t fic_qmat_hq[64] = {
1, 2, 2, 2, 3, 3, 3, 4,
2, 2, 2, 3, 3, 3, 4, 4,
2, 2, 3, 3, 3, 4, 4, 4,
2, 2, 3, 3, 3, 4, 4, 5,
2, 3, 3, 3, 4, 4, 5, 6,
3, 3, 3, 4, 4, 5, 6, 7,
3, 3, 3, 4, 4, 5, 7, 7,
3, 3, 4, 4, 5, 7, 7, 7,
};
static const uint8_t fic_qmat_lq[64] = {
1, 5, 6, 7, 8, 9, 9, 11,
5, 5, 7, 8, 9, 9, 11, 12,
6, 7, 8, 9, 9, 11, 11, 12,
7, 7, 8, 9, 9, 11, 12, 13,
7, 8, 9, 9, 10, 11, 13, 16,
8, 9, 9, 10, 11, 13, 16, 19,
8, 9, 9, 11, 12, 15, 18, 23,
9, 9, 11, 12, 15, 18, 23, 27
};
static const uint8_t fic_header[7] = { 0, 0, 1, 'F', 'I', 'C', 'V' };
#define FIC_HEADER_SIZE 27
#define CURSOR_OFFSET 59
static av_always_inline void fic_idct(int16_t *blk, int step, int shift, int rnd)
{
const unsigned t0 = 27246 * blk[3 * step] + 18405 * blk[5 * step];
const unsigned t1 = 27246 * blk[5 * step] - 18405 * blk[3 * step];
const unsigned t2 = 6393 * blk[7 * step] + 32139 * blk[1 * step];
const unsigned t3 = 6393 * blk[1 * step] - 32139 * blk[7 * step];
const unsigned t4 = 5793U * ((int)(t2 + t0 + 0x800) >> 12);
const unsigned t5 = 5793U * ((int)(t3 + t1 + 0x800) >> 12);
const unsigned t6 = t2 - t0;
const unsigned t7 = t3 - t1;
const unsigned t8 = 17734 * blk[2 * step] - 42813 * blk[6 * step];
const unsigned t9 = 17734 * blk[6 * step] + 42814 * blk[2 * step];
const unsigned tA = (blk[0 * step] - blk[4 * step]) * 32768 + rnd;
const unsigned tB = (blk[0 * step] + blk[4 * step]) * 32768 + rnd;
blk[0 * step] = (int)( t4 + t9 + tB) >> shift;
blk[1 * step] = (int)( t6 + t7 + t8 + tA) >> shift;
blk[2 * step] = (int)( t6 - t7 - t8 + tA) >> shift;
blk[3 * step] = (int)( t5 - t9 + tB) >> shift;
blk[4 * step] = (int)( -t5 - t9 + tB) >> shift;
blk[5 * step] = (int)(-(t6 - t7) - t8 + tA) >> shift;
blk[6 * step] = (int)(-(t6 + t7) + t8 + tA) >> shift;
blk[7 * step] = (int)( -t4 + t9 + tB) >> shift;
}
static void fic_idct_put(uint8_t *dst, int stride, int16_t *block)
{
int i, j;
int16_t *ptr;
ptr = block;
fic_idct(ptr++, 8, 13, (1 << 12) + (1 << 17));
for (i = 1; i < 8; i++) {
fic_idct(ptr, 8, 13, 1 << 12);
ptr++;
}
ptr = block;
for (i = 0; i < 8; i++) {
fic_idct(ptr, 1, 20, 0);
ptr += 8;
}
ptr = block;
for (j = 0; j < 8; j++) {
for (i = 0; i < 8; i++)
dst[i] = av_clip_uint8(ptr[i]);
dst += stride;
ptr += 8;
}
}
static int fic_decode_block(FICContext *ctx, GetBitContext *gb,
uint8_t *dst, int stride, int16_t *block, int *is_p)
{
int i, num_coeff;
if (get_bits_left(gb) < 8)
return AVERROR_INVALIDDATA;
/* Is it a skip block? */
if (get_bits1(gb)) {
*is_p = 1;
return 0;
}
memset(block, 0, sizeof(*block) * 64);
num_coeff = get_bits(gb, 7);
if (num_coeff > 64)
return AVERROR_INVALIDDATA;
for (i = 0; i < num_coeff; i++) {
int v = get_se_golomb(gb);
if (v < -2048 || v > 2048)
return AVERROR_INVALIDDATA;
block[ff_zigzag_direct[i]] = v *
ctx->qmat[ff_zigzag_direct[i]];
}
fic_idct_put(dst, stride, block);
return 0;
}
static int fic_decode_slice(AVCodecContext *avctx, void *tdata)
{
FICContext *ctx = avctx->priv_data;
FICThreadContext *tctx = tdata;
GetBitContext gb;
const uint8_t *src = tctx->src;
int slice_h = tctx->slice_h;
int src_size = tctx->src_size;
int y_off = tctx->y_off;
int x, y, p, ret;
ret = init_get_bits8(&gb, src, src_size);
if (ret < 0)
return ret;
for (p = 0; p < 3; p++) {
int stride = ctx->frame->linesize[p];
uint8_t* dst = ctx->frame->data[p] + (y_off >> !!p) * stride;
for (y = 0; y < (slice_h >> !!p); y += 8) {
for (x = 0; x < (ctx->aligned_width >> !!p); x += 8) {
int ret;
if ((ret = fic_decode_block(ctx, &gb, dst + x, stride,
tctx->block, &tctx->p_frame)) != 0)
return ret;
}
dst += 8 * stride;
}
}
return 0;
}
static av_always_inline void fic_alpha_blend(uint8_t *dst, uint8_t *src,
int size, uint8_t *alpha)
{
int i;
for (i = 0; i < size; i++)
dst[i] += ((src[i] - dst[i]) * alpha[i]) >> 8;
}
static void fic_draw_cursor(AVCodecContext *avctx, int cur_x, int cur_y)
{
FICContext *ctx = avctx->priv_data;
uint8_t *ptr = ctx->cursor_buf;
uint8_t *dstptr[3];
uint8_t planes[4][1024];
uint8_t chroma[3][256];
int i, j, p;
/* Convert to YUVA444. */
for (i = 0; i < 1024; i++) {
planes[0][i] = (( 25 * ptr[0] + 129 * ptr[1] + 66 * ptr[2]) / 255) + 16;
planes[1][i] = ((-38 * ptr[0] + 112 * ptr[1] + -74 * ptr[2]) / 255) + 128;
planes[2][i] = ((-18 * ptr[0] + 112 * ptr[1] + -94 * ptr[2]) / 255) + 128;
planes[3][i] = ptr[3];
ptr += 4;
}
/* Subsample chroma. */
for (i = 0; i < 32; i += 2)
for (j = 0; j < 32; j += 2)
for (p = 0; p < 3; p++)
chroma[p][16 * (i / 2) + j / 2] = (planes[p + 1][32 * i + j ] +
planes[p + 1][32 * i + j + 1] +
planes[p + 1][32 * (i + 1) + j ] +
planes[p + 1][32 * (i + 1) + j + 1]) / 4;
/* Seek to x/y pos of cursor. */
for (i = 0; i < 3; i++)
dstptr[i] = ctx->final_frame->data[i] +
(ctx->final_frame->linesize[i] * (cur_y >> !!i)) +
(cur_x >> !!i) + !!i;
/* Copy. */
for (i = 0; i < FFMIN(32, avctx->height - cur_y) - 1; i += 2) {
int lsize = FFMIN(32, avctx->width - cur_x);
int csize = lsize / 2;
fic_alpha_blend(dstptr[0],
planes[0] + i * 32, lsize, planes[3] + i * 32);
fic_alpha_blend(dstptr[0] + ctx->final_frame->linesize[0],
planes[0] + (i + 1) * 32, lsize, planes[3] + (i + 1) * 32);
fic_alpha_blend(dstptr[1],
chroma[0] + (i / 2) * 16, csize, chroma[2] + (i / 2) * 16);
fic_alpha_blend(dstptr[2],
chroma[1] + (i / 2) * 16, csize, chroma[2] + (i / 2) * 16);
dstptr[0] += ctx->final_frame->linesize[0] * 2;
dstptr[1] += ctx->final_frame->linesize[1];
dstptr[2] += ctx->final_frame->linesize[2];
}
}
static int fic_decode_frame(AVCodecContext *avctx, AVFrame *rframe,
int *got_frame, AVPacket *avpkt)
{
FICContext *ctx = avctx->priv_data;
const uint8_t *src = avpkt->data;
int ret;
int slice, nslices;
int msize;
int tsize;
int cur_x, cur_y;
int skip_cursor = ctx->skip_cursor;
const uint8_t *sdata;
if ((ret = ff_reget_buffer(avctx, ctx->frame, 0)) < 0)
return ret;
/* Header + at least one slice (4) */
if (avpkt->size < FIC_HEADER_SIZE + 4) {
av_log(avctx, AV_LOG_ERROR, "Frame data is too small.\n");
return AVERROR_INVALIDDATA;
}
/* Check for header. */
if (memcmp(src, fic_header, 7))
av_log(avctx, AV_LOG_WARNING, "Invalid FIC Header.\n");
/* Is it a skip frame? */
if (src[17]) {
if (!ctx->final_frame) {
av_log(avctx, AV_LOG_WARNING, "Initial frame is skipped\n");
return AVERROR_INVALIDDATA;
}
goto skip;
}
nslices = src[13];
if (!nslices) {
av_log(avctx, AV_LOG_ERROR, "Zero slices found.\n");
return AVERROR_INVALIDDATA;
}
/* High or Low Quality Matrix? */
ctx->qmat = src[23] ? fic_qmat_hq : fic_qmat_lq;
/* Skip cursor data. */
tsize = AV_RB24(src + 24);
if (tsize > avpkt->size - FIC_HEADER_SIZE) {
av_log(avctx, AV_LOG_ERROR,
"Packet is too small to contain cursor (%d vs %d bytes).\n",
tsize, avpkt->size - FIC_HEADER_SIZE);
return AVERROR_INVALIDDATA;
}
if (!tsize || !AV_RL16(src + 37) || !AV_RL16(src + 39))
skip_cursor = 1;
if (!skip_cursor && tsize < 32) {
av_log(avctx, AV_LOG_WARNING,
"Cursor data too small. Skipping cursor.\n");
skip_cursor = 1;
}
/* Cursor position. */
cur_x = AV_RL16(src + 33);
cur_y = AV_RL16(src + 35);
if (!skip_cursor && (cur_x > avctx->width || cur_y > avctx->height)) {
av_log(avctx, AV_LOG_DEBUG,
"Invalid cursor position: (%d,%d). Skipping cursor.\n",
cur_x, cur_y);
skip_cursor = 1;
}
if (!skip_cursor && (AV_RL16(src + 37) != 32 || AV_RL16(src + 39) != 32)) {
av_log(avctx, AV_LOG_WARNING,
"Invalid cursor size. Skipping cursor.\n");
skip_cursor = 1;
}
if (!skip_cursor && avpkt->size < CURSOR_OFFSET + sizeof(ctx->cursor_buf)) {
skip_cursor = 1;
}
/* Slice height for all but the last slice. */
ctx->slice_h = 16 * (ctx->aligned_height >> 4) / nslices;
if (ctx->slice_h % 16)
ctx->slice_h = FFALIGN(ctx->slice_h - 16, 16);
/* First slice offset and remaining data. */
sdata = src + tsize + FIC_HEADER_SIZE + 4 * nslices;
msize = avpkt->size - nslices * 4 - tsize - FIC_HEADER_SIZE;
if (msize <= ctx->aligned_width/8 * (ctx->aligned_height/8) / 8) {
av_log(avctx, AV_LOG_ERROR, "Not enough frame data to decode.\n");
return AVERROR_INVALIDDATA;
}
/* Allocate slice data. */
av_fast_malloc(&ctx->slice_data, &ctx->slice_data_size,
nslices * sizeof(ctx->slice_data[0]));
if (!ctx->slice_data_size) {
av_log(avctx, AV_LOG_ERROR, "Could not allocate slice data.\n");
return AVERROR(ENOMEM);
}
memset(ctx->slice_data, 0, nslices * sizeof(ctx->slice_data[0]));
for (slice = 0; slice < nslices; slice++) {
unsigned slice_off = AV_RB32(src + tsize + FIC_HEADER_SIZE + slice * 4);
unsigned slice_size;
int y_off = ctx->slice_h * slice;
int slice_h = ctx->slice_h;
/*
* Either read the slice size, or consume all data left.
* Also, special case the last slight height.
*/
if (slice == nslices - 1) {
slice_size = msize;
slice_h = FFALIGN(avctx->height - ctx->slice_h * (nslices - 1), 16);
} else {
slice_size = AV_RB32(src + tsize + FIC_HEADER_SIZE + slice * 4 + 4);
if (slice_size < slice_off)
return AVERROR_INVALIDDATA;
}
if (slice_size < slice_off || slice_size > msize)
continue;
slice_size -= slice_off;
ctx->slice_data[slice].src = sdata + slice_off;
ctx->slice_data[slice].src_size = slice_size;
ctx->slice_data[slice].slice_h = slice_h;
ctx->slice_data[slice].y_off = y_off;
}
if ((ret = avctx->execute(avctx, fic_decode_slice, ctx->slice_data,
NULL, nslices, sizeof(ctx->slice_data[0]))) < 0)
return ret;
ctx->frame->key_frame = 1;
ctx->frame->pict_type = AV_PICTURE_TYPE_I;
for (slice = 0; slice < nslices; slice++) {
if (ctx->slice_data[slice].p_frame) {
ctx->frame->key_frame = 0;
ctx->frame->pict_type = AV_PICTURE_TYPE_P;
break;
}
}
av_frame_free(&ctx->final_frame);
ctx->final_frame = av_frame_clone(ctx->frame);
if (!ctx->final_frame) {
av_log(avctx, AV_LOG_ERROR, "Could not clone frame buffer.\n");
return AVERROR(ENOMEM);
}
/* Make sure we use a user-supplied buffer. */
if ((ret = ff_reget_buffer(avctx, ctx->final_frame, 0)) < 0) {
av_log(avctx, AV_LOG_ERROR, "Could not make frame writable.\n");
return ret;
}
/* Draw cursor. */
if (!skip_cursor) {
memcpy(ctx->cursor_buf, src + CURSOR_OFFSET, sizeof(ctx->cursor_buf));
fic_draw_cursor(avctx, cur_x, cur_y);
}
skip:
*got_frame = 1;
if ((ret = av_frame_ref(rframe, ctx->final_frame)) < 0)
return ret;
return avpkt->size;
}
static av_cold int fic_decode_close(AVCodecContext *avctx)
{
FICContext *ctx = avctx->priv_data;
av_freep(&ctx->slice_data);
av_frame_free(&ctx->final_frame);
av_frame_free(&ctx->frame);
return 0;
}
static av_cold int fic_decode_init(AVCodecContext *avctx)
{
FICContext *ctx = avctx->priv_data;
/* Initialize various context values */
ctx->avctx = avctx;
ctx->aligned_width = FFALIGN(avctx->width, 16);
ctx->aligned_height = FFALIGN(avctx->height, 16);
avctx->pix_fmt = AV_PIX_FMT_YUV420P;
avctx->bits_per_raw_sample = 8;
ctx->frame = av_frame_alloc();
if (!ctx->frame)
return AVERROR(ENOMEM);
return 0;
}
static const AVOption options[] = {
{ "skip_cursor", "skip the cursor", offsetof(FICContext, skip_cursor), AV_OPT_TYPE_BOOL, {.i64 = 0 }, 0, 1, AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_VIDEO_PARAM },
{ NULL },
};
static const AVClass fic_decoder_class = {
.class_name = "FIC decoder",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
const FFCodec ff_fic_decoder = {
.p.name = "fic",
.p.long_name = NULL_IF_CONFIG_SMALL("Mirillis FIC"),
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_FIC,
.priv_data_size = sizeof(FICContext),
.init = fic_decode_init,
FF_CODEC_DECODE_CB(fic_decode_frame),
.close = fic_decode_close,
.p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_SLICE_THREADS,
.p.priv_class = &fic_decoder_class,
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
};
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